114cf11afSPaul Mackerras/* 214cf11afSPaul Mackerras * PowerPC version 314cf11afSPaul Mackerras * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) 414cf11afSPaul Mackerras * 514cf11afSPaul Mackerras * Rewritten by Cort Dougan (cort@cs.nmt.edu) for PReP 614cf11afSPaul Mackerras * Copyright (C) 1996 Cort Dougan <cort@cs.nmt.edu> 714cf11afSPaul Mackerras * Adapted for Power Macintosh by Paul Mackerras. 814cf11afSPaul Mackerras * Low-level exception handlers and MMU support 914cf11afSPaul Mackerras * rewritten by Paul Mackerras. 1014cf11afSPaul Mackerras * Copyright (C) 1996 Paul Mackerras. 1114cf11afSPaul Mackerras * 1214cf11afSPaul Mackerras * Adapted for 64bit PowerPC by Dave Engebretsen, Peter Bergner, and 1314cf11afSPaul Mackerras * Mike Corrigan {engebret|bergner|mikejc}@us.ibm.com 1414cf11afSPaul Mackerras * 1514cf11afSPaul Mackerras * This file contains the low-level support and setup for the 1614cf11afSPaul Mackerras * PowerPC-64 platform, including trap and interrupt dispatch. 1714cf11afSPaul Mackerras * 1814cf11afSPaul Mackerras * This program is free software; you can redistribute it and/or 1914cf11afSPaul Mackerras * modify it under the terms of the GNU General Public License 2014cf11afSPaul Mackerras * as published by the Free Software Foundation; either version 2114cf11afSPaul Mackerras * 2 of the License, or (at your option) any later version. 2214cf11afSPaul Mackerras */ 2314cf11afSPaul Mackerras 2414cf11afSPaul Mackerras#include <linux/threads.h> 25b5bbeb23SPaul Mackerras#include <asm/reg.h> 2614cf11afSPaul Mackerras#include <asm/page.h> 2714cf11afSPaul Mackerras#include <asm/mmu.h> 2814cf11afSPaul Mackerras#include <asm/ppc_asm.h> 2914cf11afSPaul Mackerras#include <asm/asm-offsets.h> 3014cf11afSPaul Mackerras#include <asm/bug.h> 3114cf11afSPaul Mackerras#include <asm/cputable.h> 3214cf11afSPaul Mackerras#include <asm/setup.h> 3314cf11afSPaul Mackerras#include <asm/hvcall.h> 34c43a55ffSKelly Daly#include <asm/iseries/lpar_map.h> 356cb7bfebSDavid Gibson#include <asm/thread_info.h> 363f639ee8SStephen Rothwell#include <asm/firmware.h> 3716a15a30SStephen Rothwell#include <asm/page_64.h> 38f9ff0f30SStephen Rothwell#include <asm/exception.h> 39945feb17SBenjamin Herrenschmidt#include <asm/irqflags.h> 4014cf11afSPaul Mackerras 4114cf11afSPaul Mackerras/* 4214cf11afSPaul Mackerras * We layout physical memory as follows: 4314cf11afSPaul Mackerras * 0x0000 - 0x00ff : Secondary processor spin code 4414cf11afSPaul Mackerras * 0x0100 - 0x2fff : pSeries Interrupt prologs 4514cf11afSPaul Mackerras * 0x3000 - 0x5fff : interrupt support, iSeries and common interrupt prologs 4614cf11afSPaul Mackerras * 0x6000 - 0x6fff : Initial (CPU0) segment table 4714cf11afSPaul Mackerras * 0x7000 - 0x7fff : FWNMI data area 4814cf11afSPaul Mackerras * 0x8000 - : Early init and support code 4914cf11afSPaul Mackerras */ 5014cf11afSPaul Mackerras 5114cf11afSPaul Mackerras/* 5214cf11afSPaul Mackerras * SPRG Usage 5314cf11afSPaul Mackerras * 5414cf11afSPaul Mackerras * Register Definition 5514cf11afSPaul Mackerras * 5614cf11afSPaul Mackerras * SPRG0 reserved for hypervisor 5714cf11afSPaul Mackerras * SPRG1 temp - used to save gpr 5814cf11afSPaul Mackerras * SPRG2 temp - used to save gpr 5914cf11afSPaul Mackerras * SPRG3 virt addr of paca 6014cf11afSPaul Mackerras */ 6114cf11afSPaul Mackerras 6214cf11afSPaul Mackerras/* 6314cf11afSPaul Mackerras * Entering into this code we make the following assumptions: 6414cf11afSPaul Mackerras * For pSeries: 6514cf11afSPaul Mackerras * 1. The MMU is off & open firmware is running in real mode. 6614cf11afSPaul Mackerras * 2. The kernel is entered at __start 6714cf11afSPaul Mackerras * 6814cf11afSPaul Mackerras * For iSeries: 6914cf11afSPaul Mackerras * 1. The MMU is on (as it always is for iSeries) 7014cf11afSPaul Mackerras * 2. The kernel is entered at system_reset_iSeries 7114cf11afSPaul Mackerras */ 7214cf11afSPaul Mackerras 7314cf11afSPaul Mackerras .text 7414cf11afSPaul Mackerras .globl _stext 7514cf11afSPaul Mackerras_stext: 7614cf11afSPaul Mackerras_GLOBAL(__start) 7714cf11afSPaul Mackerras /* NOP this out unconditionally */ 7814cf11afSPaul MackerrasBEGIN_FTR_SECTION 7914cf11afSPaul Mackerras b .__start_initialization_multiplatform 8014cf11afSPaul MackerrasEND_FTR_SECTION(0, 1) 8114cf11afSPaul Mackerras 8214cf11afSPaul Mackerras /* Catch branch to 0 in real mode */ 8314cf11afSPaul Mackerras trap 8414cf11afSPaul Mackerras 8514cf11afSPaul Mackerras /* Secondary processors spin on this value until it goes to 1. */ 8614cf11afSPaul Mackerras .globl __secondary_hold_spinloop 8714cf11afSPaul Mackerras__secondary_hold_spinloop: 8814cf11afSPaul Mackerras .llong 0x0 8914cf11afSPaul Mackerras 9014cf11afSPaul Mackerras /* Secondary processors write this value with their cpu # */ 9114cf11afSPaul Mackerras /* after they enter the spin loop immediately below. */ 9214cf11afSPaul Mackerras .globl __secondary_hold_acknowledge 9314cf11afSPaul Mackerras__secondary_hold_acknowledge: 9414cf11afSPaul Mackerras .llong 0x0 9514cf11afSPaul Mackerras 961dce0e30SMichael Ellerman#ifdef CONFIG_PPC_ISERIES 971dce0e30SMichael Ellerman /* 981dce0e30SMichael Ellerman * At offset 0x20, there is a pointer to iSeries LPAR data. 991dce0e30SMichael Ellerman * This is required by the hypervisor 1001dce0e30SMichael Ellerman */ 1011dce0e30SMichael Ellerman . = 0x20 1021dce0e30SMichael Ellerman .llong hvReleaseData-KERNELBASE 1031dce0e30SMichael Ellerman#endif /* CONFIG_PPC_ISERIES */ 1041dce0e30SMichael Ellerman 10514cf11afSPaul Mackerras . = 0x60 10614cf11afSPaul Mackerras/* 10775423b7bSGeoff Levand * The following code is used to hold secondary processors 10875423b7bSGeoff Levand * in a spin loop after they have entered the kernel, but 10914cf11afSPaul Mackerras * before the bulk of the kernel has been relocated. This code 11014cf11afSPaul Mackerras * is relocated to physical address 0x60 before prom_init is run. 11114cf11afSPaul Mackerras * All of it must fit below the first exception vector at 0x100. 11214cf11afSPaul Mackerras */ 11314cf11afSPaul Mackerras_GLOBAL(__secondary_hold) 11414cf11afSPaul Mackerras mfmsr r24 11514cf11afSPaul Mackerras ori r24,r24,MSR_RI 11614cf11afSPaul Mackerras mtmsrd r24 /* RI on */ 11714cf11afSPaul Mackerras 118f1870f77SAnton Blanchard /* Grab our physical cpu number */ 11914cf11afSPaul Mackerras mr r24,r3 12014cf11afSPaul Mackerras 12114cf11afSPaul Mackerras /* Tell the master cpu we're here */ 12214cf11afSPaul Mackerras /* Relocation is off & we are located at an address less */ 12314cf11afSPaul Mackerras /* than 0x100, so only need to grab low order offset. */ 12414cf11afSPaul Mackerras std r24,__secondary_hold_acknowledge@l(0) 12514cf11afSPaul Mackerras sync 12614cf11afSPaul Mackerras 12714cf11afSPaul Mackerras /* All secondary cpus wait here until told to start. */ 12814cf11afSPaul Mackerras100: ld r4,__secondary_hold_spinloop@l(0) 12914cf11afSPaul Mackerras cmpdi 0,r4,1 13014cf11afSPaul Mackerras bne 100b 13114cf11afSPaul Mackerras 132f1870f77SAnton Blanchard#if defined(CONFIG_SMP) || defined(CONFIG_KEXEC) 133f39b7a55SOlof Johansson LOAD_REG_IMMEDIATE(r4, .generic_secondary_smp_init) 134758438a7SMichael Ellerman mtctr r4 13514cf11afSPaul Mackerras mr r3,r24 136758438a7SMichael Ellerman bctr 13714cf11afSPaul Mackerras#else 13814cf11afSPaul Mackerras BUG_OPCODE 13914cf11afSPaul Mackerras#endif 14014cf11afSPaul Mackerras 14114cf11afSPaul Mackerras/* This value is used to mark exception frames on the stack. */ 14214cf11afSPaul Mackerras .section ".toc","aw" 14314cf11afSPaul Mackerrasexception_marker: 14414cf11afSPaul Mackerras .tc ID_72656773_68657265[TC],0x7265677368657265 14514cf11afSPaul Mackerras .text 14614cf11afSPaul Mackerras 14714cf11afSPaul Mackerras/* 14814cf11afSPaul Mackerras * This is the start of the interrupt handlers for pSeries 14914cf11afSPaul Mackerras * This code runs with relocation off. 15014cf11afSPaul Mackerras */ 15114cf11afSPaul Mackerras . = 0x100 15214cf11afSPaul Mackerras .globl __start_interrupts 15314cf11afSPaul Mackerras__start_interrupts: 15414cf11afSPaul Mackerras 15514cf11afSPaul Mackerras STD_EXCEPTION_PSERIES(0x100, system_reset) 15614cf11afSPaul Mackerras 15714cf11afSPaul Mackerras . = 0x200 15814cf11afSPaul Mackerras_machine_check_pSeries: 15914cf11afSPaul Mackerras HMT_MEDIUM 160b5bbeb23SPaul Mackerras mtspr SPRN_SPRG1,r13 /* save r13 */ 16114cf11afSPaul Mackerras EXCEPTION_PROLOG_PSERIES(PACA_EXMC, machine_check_common) 16214cf11afSPaul Mackerras 16314cf11afSPaul Mackerras . = 0x300 16414cf11afSPaul Mackerras .globl data_access_pSeries 16514cf11afSPaul Mackerrasdata_access_pSeries: 16614cf11afSPaul Mackerras HMT_MEDIUM 167b5bbeb23SPaul Mackerras mtspr SPRN_SPRG1,r13 16814cf11afSPaul MackerrasBEGIN_FTR_SECTION 169b5bbeb23SPaul Mackerras mtspr SPRN_SPRG2,r12 170b5bbeb23SPaul Mackerras mfspr r13,SPRN_DAR 171b5bbeb23SPaul Mackerras mfspr r12,SPRN_DSISR 17214cf11afSPaul Mackerras srdi r13,r13,60 17314cf11afSPaul Mackerras rlwimi r13,r12,16,0x20 17414cf11afSPaul Mackerras mfcr r12 17514cf11afSPaul Mackerras cmpwi r13,0x2c 1763ccfc65cSPaul Mackerras beq do_stab_bolted_pSeries 17714cf11afSPaul Mackerras mtcrf 0x80,r12 178b5bbeb23SPaul Mackerras mfspr r12,SPRN_SPRG2 17914cf11afSPaul MackerrasEND_FTR_SECTION_IFCLR(CPU_FTR_SLB) 18014cf11afSPaul Mackerras EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, data_access_common) 18114cf11afSPaul Mackerras 18214cf11afSPaul Mackerras . = 0x380 18314cf11afSPaul Mackerras .globl data_access_slb_pSeries 18414cf11afSPaul Mackerrasdata_access_slb_pSeries: 18514cf11afSPaul Mackerras HMT_MEDIUM 186b5bbeb23SPaul Mackerras mtspr SPRN_SPRG1,r13 187b5bbeb23SPaul Mackerras mfspr r13,SPRN_SPRG3 /* get paca address into r13 */ 1883c726f8dSBenjamin Herrenschmidt std r3,PACA_EXSLB+EX_R3(r13) 1893c726f8dSBenjamin Herrenschmidt mfspr r3,SPRN_DAR 19014cf11afSPaul Mackerras std r9,PACA_EXSLB+EX_R9(r13) /* save r9 - r12 */ 1913c726f8dSBenjamin Herrenschmidt mfcr r9 1923c726f8dSBenjamin Herrenschmidt#ifdef __DISABLED__ 1933c726f8dSBenjamin Herrenschmidt /* Keep that around for when we re-implement dynamic VSIDs */ 1943c726f8dSBenjamin Herrenschmidt cmpdi r3,0 1953c726f8dSBenjamin Herrenschmidt bge slb_miss_user_pseries 1963c726f8dSBenjamin Herrenschmidt#endif /* __DISABLED__ */ 19714cf11afSPaul Mackerras std r10,PACA_EXSLB+EX_R10(r13) 19814cf11afSPaul Mackerras std r11,PACA_EXSLB+EX_R11(r13) 19914cf11afSPaul Mackerras std r12,PACA_EXSLB+EX_R12(r13) 2003c726f8dSBenjamin Herrenschmidt mfspr r10,SPRN_SPRG1 2013c726f8dSBenjamin Herrenschmidt std r10,PACA_EXSLB+EX_R13(r13) 202b5bbeb23SPaul Mackerras mfspr r12,SPRN_SRR1 /* and SRR1 */ 2033c726f8dSBenjamin Herrenschmidt b .slb_miss_realmode /* Rel. branch works in real mode */ 20414cf11afSPaul Mackerras 20514cf11afSPaul Mackerras STD_EXCEPTION_PSERIES(0x400, instruction_access) 20614cf11afSPaul Mackerras 20714cf11afSPaul Mackerras . = 0x480 20814cf11afSPaul Mackerras .globl instruction_access_slb_pSeries 20914cf11afSPaul Mackerrasinstruction_access_slb_pSeries: 21014cf11afSPaul Mackerras HMT_MEDIUM 211b5bbeb23SPaul Mackerras mtspr SPRN_SPRG1,r13 212b5bbeb23SPaul Mackerras mfspr r13,SPRN_SPRG3 /* get paca address into r13 */ 2133c726f8dSBenjamin Herrenschmidt std r3,PACA_EXSLB+EX_R3(r13) 2143c726f8dSBenjamin Herrenschmidt mfspr r3,SPRN_SRR0 /* SRR0 is faulting address */ 21514cf11afSPaul Mackerras std r9,PACA_EXSLB+EX_R9(r13) /* save r9 - r12 */ 2163c726f8dSBenjamin Herrenschmidt mfcr r9 2173c726f8dSBenjamin Herrenschmidt#ifdef __DISABLED__ 2183c726f8dSBenjamin Herrenschmidt /* Keep that around for when we re-implement dynamic VSIDs */ 2193c726f8dSBenjamin Herrenschmidt cmpdi r3,0 2203c726f8dSBenjamin Herrenschmidt bge slb_miss_user_pseries 2213c726f8dSBenjamin Herrenschmidt#endif /* __DISABLED__ */ 22214cf11afSPaul Mackerras std r10,PACA_EXSLB+EX_R10(r13) 22314cf11afSPaul Mackerras std r11,PACA_EXSLB+EX_R11(r13) 22414cf11afSPaul Mackerras std r12,PACA_EXSLB+EX_R12(r13) 2253c726f8dSBenjamin Herrenschmidt mfspr r10,SPRN_SPRG1 2263c726f8dSBenjamin Herrenschmidt std r10,PACA_EXSLB+EX_R13(r13) 227b5bbeb23SPaul Mackerras mfspr r12,SPRN_SRR1 /* and SRR1 */ 2283c726f8dSBenjamin Herrenschmidt b .slb_miss_realmode /* Rel. branch works in real mode */ 22914cf11afSPaul Mackerras 230d04c56f7SPaul Mackerras MASKABLE_EXCEPTION_PSERIES(0x500, hardware_interrupt) 23114cf11afSPaul Mackerras STD_EXCEPTION_PSERIES(0x600, alignment) 23214cf11afSPaul Mackerras STD_EXCEPTION_PSERIES(0x700, program_check) 23314cf11afSPaul Mackerras STD_EXCEPTION_PSERIES(0x800, fp_unavailable) 234d04c56f7SPaul Mackerras MASKABLE_EXCEPTION_PSERIES(0x900, decrementer) 23514cf11afSPaul Mackerras STD_EXCEPTION_PSERIES(0xa00, trap_0a) 23614cf11afSPaul Mackerras STD_EXCEPTION_PSERIES(0xb00, trap_0b) 23714cf11afSPaul Mackerras 23814cf11afSPaul Mackerras . = 0xc00 23914cf11afSPaul Mackerras .globl system_call_pSeries 24014cf11afSPaul Mackerrassystem_call_pSeries: 24114cf11afSPaul Mackerras HMT_MEDIUM 242745a14ccSPaul MackerrasBEGIN_FTR_SECTION 243745a14ccSPaul Mackerras cmpdi r0,0x1ebe 244745a14ccSPaul Mackerras beq- 1f 245745a14ccSPaul MackerrasEND_FTR_SECTION_IFSET(CPU_FTR_REAL_LE) 24614cf11afSPaul Mackerras mr r9,r13 24714cf11afSPaul Mackerras mfmsr r10 248b5bbeb23SPaul Mackerras mfspr r13,SPRN_SPRG3 249b5bbeb23SPaul Mackerras mfspr r11,SPRN_SRR0 25014cf11afSPaul Mackerras clrrdi r12,r13,32 25114cf11afSPaul Mackerras oris r12,r12,system_call_common@h 25214cf11afSPaul Mackerras ori r12,r12,system_call_common@l 253b5bbeb23SPaul Mackerras mtspr SPRN_SRR0,r12 25414cf11afSPaul Mackerras ori r10,r10,MSR_IR|MSR_DR|MSR_RI 255b5bbeb23SPaul Mackerras mfspr r12,SPRN_SRR1 256b5bbeb23SPaul Mackerras mtspr SPRN_SRR1,r10 25714cf11afSPaul Mackerras rfid 25814cf11afSPaul Mackerras b . /* prevent speculative execution */ 25914cf11afSPaul Mackerras 260745a14ccSPaul Mackerras/* Fast LE/BE switch system call */ 261745a14ccSPaul Mackerras1: mfspr r12,SPRN_SRR1 262745a14ccSPaul Mackerras xori r12,r12,MSR_LE 263745a14ccSPaul Mackerras mtspr SPRN_SRR1,r12 264745a14ccSPaul Mackerras rfid /* return to userspace */ 265745a14ccSPaul Mackerras b . 266745a14ccSPaul Mackerras 26714cf11afSPaul Mackerras STD_EXCEPTION_PSERIES(0xd00, single_step) 26814cf11afSPaul Mackerras STD_EXCEPTION_PSERIES(0xe00, trap_0e) 26914cf11afSPaul Mackerras 27014cf11afSPaul Mackerras /* We need to deal with the Altivec unavailable exception 27114cf11afSPaul Mackerras * here which is at 0xf20, thus in the middle of the 27214cf11afSPaul Mackerras * prolog code of the PerformanceMonitor one. A little 27314cf11afSPaul Mackerras * trickery is thus necessary 27414cf11afSPaul Mackerras */ 27514cf11afSPaul Mackerras . = 0xf00 27614cf11afSPaul Mackerras b performance_monitor_pSeries 27714cf11afSPaul Mackerras 27814cf11afSPaul Mackerras STD_EXCEPTION_PSERIES(0xf20, altivec_unavailable) 27914cf11afSPaul Mackerras 280acf7d768SBenjamin Herrenschmidt#ifdef CONFIG_CBE_RAS 281acf7d768SBenjamin Herrenschmidt HSTD_EXCEPTION_PSERIES(0x1200, cbe_system_error) 282acf7d768SBenjamin Herrenschmidt#endif /* CONFIG_CBE_RAS */ 28314cf11afSPaul Mackerras STD_EXCEPTION_PSERIES(0x1300, instruction_breakpoint) 284acf7d768SBenjamin Herrenschmidt#ifdef CONFIG_CBE_RAS 285acf7d768SBenjamin Herrenschmidt HSTD_EXCEPTION_PSERIES(0x1600, cbe_maintenance) 286acf7d768SBenjamin Herrenschmidt#endif /* CONFIG_CBE_RAS */ 28714cf11afSPaul Mackerras STD_EXCEPTION_PSERIES(0x1700, altivec_assist) 288acf7d768SBenjamin Herrenschmidt#ifdef CONFIG_CBE_RAS 289acf7d768SBenjamin Herrenschmidt HSTD_EXCEPTION_PSERIES(0x1800, cbe_thermal) 290acf7d768SBenjamin Herrenschmidt#endif /* CONFIG_CBE_RAS */ 29114cf11afSPaul Mackerras 29214cf11afSPaul Mackerras . = 0x3000 29314cf11afSPaul Mackerras 29414cf11afSPaul Mackerras/*** pSeries interrupt support ***/ 29514cf11afSPaul Mackerras 29614cf11afSPaul Mackerras /* moved from 0xf00 */ 297449d846dSLivio Soares STD_EXCEPTION_PSERIES(., performance_monitor) 298d04c56f7SPaul Mackerras 299d04c56f7SPaul Mackerras/* 300d04c56f7SPaul Mackerras * An interrupt came in while soft-disabled; clear EE in SRR1, 301d04c56f7SPaul Mackerras * clear paca->hard_enabled and return. 302d04c56f7SPaul Mackerras */ 303d04c56f7SPaul Mackerrasmasked_interrupt: 304d04c56f7SPaul Mackerras stb r10,PACAHARDIRQEN(r13) 305d04c56f7SPaul Mackerras mtcrf 0x80,r9 306d04c56f7SPaul Mackerras ld r9,PACA_EXGEN+EX_R9(r13) 307d04c56f7SPaul Mackerras mfspr r10,SPRN_SRR1 308d04c56f7SPaul Mackerras rldicl r10,r10,48,1 /* clear MSR_EE */ 309d04c56f7SPaul Mackerras rotldi r10,r10,16 310d04c56f7SPaul Mackerras mtspr SPRN_SRR1,r10 311d04c56f7SPaul Mackerras ld r10,PACA_EXGEN+EX_R10(r13) 312d04c56f7SPaul Mackerras mfspr r13,SPRN_SPRG1 313d04c56f7SPaul Mackerras rfid 314d04c56f7SPaul Mackerras b . 31514cf11afSPaul Mackerras 31614cf11afSPaul Mackerras .align 7 3173ccfc65cSPaul Mackerrasdo_stab_bolted_pSeries: 31814cf11afSPaul Mackerras mtcrf 0x80,r12 319b5bbeb23SPaul Mackerras mfspr r12,SPRN_SPRG2 32014cf11afSPaul Mackerras EXCEPTION_PROLOG_PSERIES(PACA_EXSLB, .do_stab_bolted) 32114cf11afSPaul Mackerras 32214cf11afSPaul Mackerras/* 3233c726f8dSBenjamin Herrenschmidt * We have some room here we use that to put 3243c726f8dSBenjamin Herrenschmidt * the peries slb miss user trampoline code so it's reasonably 3253c726f8dSBenjamin Herrenschmidt * away from slb_miss_user_common to avoid problems with rfid 3263c726f8dSBenjamin Herrenschmidt * 3273c726f8dSBenjamin Herrenschmidt * This is used for when the SLB miss handler has to go virtual, 3283c726f8dSBenjamin Herrenschmidt * which doesn't happen for now anymore but will once we re-implement 3293c726f8dSBenjamin Herrenschmidt * dynamic VSIDs for shared page tables 3303c726f8dSBenjamin Herrenschmidt */ 3313c726f8dSBenjamin Herrenschmidt#ifdef __DISABLED__ 3323c726f8dSBenjamin Herrenschmidtslb_miss_user_pseries: 3333c726f8dSBenjamin Herrenschmidt std r10,PACA_EXGEN+EX_R10(r13) 3343c726f8dSBenjamin Herrenschmidt std r11,PACA_EXGEN+EX_R11(r13) 3353c726f8dSBenjamin Herrenschmidt std r12,PACA_EXGEN+EX_R12(r13) 3363c726f8dSBenjamin Herrenschmidt mfspr r10,SPRG1 3373c726f8dSBenjamin Herrenschmidt ld r11,PACA_EXSLB+EX_R9(r13) 3383c726f8dSBenjamin Herrenschmidt ld r12,PACA_EXSLB+EX_R3(r13) 3393c726f8dSBenjamin Herrenschmidt std r10,PACA_EXGEN+EX_R13(r13) 3403c726f8dSBenjamin Herrenschmidt std r11,PACA_EXGEN+EX_R9(r13) 3413c726f8dSBenjamin Herrenschmidt std r12,PACA_EXGEN+EX_R3(r13) 3423c726f8dSBenjamin Herrenschmidt clrrdi r12,r13,32 3433c726f8dSBenjamin Herrenschmidt mfmsr r10 3443c726f8dSBenjamin Herrenschmidt mfspr r11,SRR0 /* save SRR0 */ 3453c726f8dSBenjamin Herrenschmidt ori r12,r12,slb_miss_user_common@l /* virt addr of handler */ 3463c726f8dSBenjamin Herrenschmidt ori r10,r10,MSR_IR|MSR_DR|MSR_RI 3473c726f8dSBenjamin Herrenschmidt mtspr SRR0,r12 3483c726f8dSBenjamin Herrenschmidt mfspr r12,SRR1 /* and SRR1 */ 3493c726f8dSBenjamin Herrenschmidt mtspr SRR1,r10 3503c726f8dSBenjamin Herrenschmidt rfid 3513c726f8dSBenjamin Herrenschmidt b . /* prevent spec. execution */ 3523c726f8dSBenjamin Herrenschmidt#endif /* __DISABLED__ */ 3533c726f8dSBenjamin Herrenschmidt 3549e4859efSStephen Rothwell#ifdef CONFIG_PPC_PSERIES 3553c726f8dSBenjamin Herrenschmidt/* 35614cf11afSPaul Mackerras * Vectors for the FWNMI option. Share common code. 35714cf11afSPaul Mackerras */ 35814cf11afSPaul Mackerras .globl system_reset_fwnmi 3598c4f1f29SMichael Ellerman .align 7 36014cf11afSPaul Mackerrassystem_reset_fwnmi: 36114cf11afSPaul Mackerras HMT_MEDIUM 362b5bbeb23SPaul Mackerras mtspr SPRN_SPRG1,r13 /* save r13 */ 3639fc0a92cSOlaf Hering EXCEPTION_PROLOG_PSERIES_FORCE_64BIT(PACA_EXGEN, system_reset_common) 36414cf11afSPaul Mackerras 36514cf11afSPaul Mackerras .globl machine_check_fwnmi 3668c4f1f29SMichael Ellerman .align 7 36714cf11afSPaul Mackerrasmachine_check_fwnmi: 36814cf11afSPaul Mackerras HMT_MEDIUM 369b5bbeb23SPaul Mackerras mtspr SPRN_SPRG1,r13 /* save r13 */ 3709fc0a92cSOlaf Hering EXCEPTION_PROLOG_PSERIES_FORCE_64BIT(PACA_EXMC, machine_check_common) 37114cf11afSPaul Mackerras 3729e4859efSStephen Rothwell#endif /* CONFIG_PPC_PSERIES */ 3739e4859efSStephen Rothwell 37414cf11afSPaul Mackerras/*** Common interrupt handlers ***/ 37514cf11afSPaul Mackerras 37614cf11afSPaul Mackerras STD_EXCEPTION_COMMON(0x100, system_reset, .system_reset_exception) 37714cf11afSPaul Mackerras 37814cf11afSPaul Mackerras /* 37914cf11afSPaul Mackerras * Machine check is different because we use a different 38014cf11afSPaul Mackerras * save area: PACA_EXMC instead of PACA_EXGEN. 38114cf11afSPaul Mackerras */ 38214cf11afSPaul Mackerras .align 7 38314cf11afSPaul Mackerras .globl machine_check_common 38414cf11afSPaul Mackerrasmachine_check_common: 38514cf11afSPaul Mackerras EXCEPTION_PROLOG_COMMON(0x200, PACA_EXMC) 386f39224a8SPaul Mackerras FINISH_NAP 38714cf11afSPaul Mackerras DISABLE_INTS 38814cf11afSPaul Mackerras bl .save_nvgprs 38914cf11afSPaul Mackerras addi r3,r1,STACK_FRAME_OVERHEAD 39014cf11afSPaul Mackerras bl .machine_check_exception 39114cf11afSPaul Mackerras b .ret_from_except 39214cf11afSPaul Mackerras 39314cf11afSPaul Mackerras STD_EXCEPTION_COMMON_LITE(0x900, decrementer, .timer_interrupt) 39414cf11afSPaul Mackerras STD_EXCEPTION_COMMON(0xa00, trap_0a, .unknown_exception) 39514cf11afSPaul Mackerras STD_EXCEPTION_COMMON(0xb00, trap_0b, .unknown_exception) 39614cf11afSPaul Mackerras STD_EXCEPTION_COMMON(0xd00, single_step, .single_step_exception) 39714cf11afSPaul Mackerras STD_EXCEPTION_COMMON(0xe00, trap_0e, .unknown_exception) 398f39224a8SPaul Mackerras STD_EXCEPTION_COMMON_IDLE(0xf00, performance_monitor, .performance_monitor_exception) 39914cf11afSPaul Mackerras STD_EXCEPTION_COMMON(0x1300, instruction_breakpoint, .instruction_breakpoint_exception) 40014cf11afSPaul Mackerras#ifdef CONFIG_ALTIVEC 40114cf11afSPaul Mackerras STD_EXCEPTION_COMMON(0x1700, altivec_assist, .altivec_assist_exception) 40214cf11afSPaul Mackerras#else 40314cf11afSPaul Mackerras STD_EXCEPTION_COMMON(0x1700, altivec_assist, .unknown_exception) 40414cf11afSPaul Mackerras#endif 405acf7d768SBenjamin Herrenschmidt#ifdef CONFIG_CBE_RAS 406acf7d768SBenjamin Herrenschmidt STD_EXCEPTION_COMMON(0x1200, cbe_system_error, .cbe_system_error_exception) 407acf7d768SBenjamin Herrenschmidt STD_EXCEPTION_COMMON(0x1600, cbe_maintenance, .cbe_maintenance_exception) 408acf7d768SBenjamin Herrenschmidt STD_EXCEPTION_COMMON(0x1800, cbe_thermal, .cbe_thermal_exception) 409acf7d768SBenjamin Herrenschmidt#endif /* CONFIG_CBE_RAS */ 41014cf11afSPaul Mackerras 41114cf11afSPaul Mackerras/* 41214cf11afSPaul Mackerras * Here we have detected that the kernel stack pointer is bad. 41314cf11afSPaul Mackerras * R9 contains the saved CR, r13 points to the paca, 41414cf11afSPaul Mackerras * r10 contains the (bad) kernel stack pointer, 41514cf11afSPaul Mackerras * r11 and r12 contain the saved SRR0 and SRR1. 41614cf11afSPaul Mackerras * We switch to using an emergency stack, save the registers there, 41714cf11afSPaul Mackerras * and call kernel_bad_stack(), which panics. 41814cf11afSPaul Mackerras */ 41914cf11afSPaul Mackerrasbad_stack: 42014cf11afSPaul Mackerras ld r1,PACAEMERGSP(r13) 42114cf11afSPaul Mackerras subi r1,r1,64+INT_FRAME_SIZE 42214cf11afSPaul Mackerras std r9,_CCR(r1) 42314cf11afSPaul Mackerras std r10,GPR1(r1) 42414cf11afSPaul Mackerras std r11,_NIP(r1) 42514cf11afSPaul Mackerras std r12,_MSR(r1) 426b5bbeb23SPaul Mackerras mfspr r11,SPRN_DAR 427b5bbeb23SPaul Mackerras mfspr r12,SPRN_DSISR 42814cf11afSPaul Mackerras std r11,_DAR(r1) 42914cf11afSPaul Mackerras std r12,_DSISR(r1) 43014cf11afSPaul Mackerras mflr r10 43114cf11afSPaul Mackerras mfctr r11 43214cf11afSPaul Mackerras mfxer r12 43314cf11afSPaul Mackerras std r10,_LINK(r1) 43414cf11afSPaul Mackerras std r11,_CTR(r1) 43514cf11afSPaul Mackerras std r12,_XER(r1) 43614cf11afSPaul Mackerras SAVE_GPR(0,r1) 43714cf11afSPaul Mackerras SAVE_GPR(2,r1) 43814cf11afSPaul Mackerras SAVE_4GPRS(3,r1) 43914cf11afSPaul Mackerras SAVE_2GPRS(7,r1) 44014cf11afSPaul Mackerras SAVE_10GPRS(12,r1) 44114cf11afSPaul Mackerras SAVE_10GPRS(22,r1) 44268730401SOlof Johansson lhz r12,PACA_TRAP_SAVE(r13) 44368730401SOlof Johansson std r12,_TRAP(r1) 44414cf11afSPaul Mackerras addi r11,r1,INT_FRAME_SIZE 44514cf11afSPaul Mackerras std r11,0(r1) 44614cf11afSPaul Mackerras li r12,0 44714cf11afSPaul Mackerras std r12,0(r11) 44814cf11afSPaul Mackerras ld r2,PACATOC(r13) 44914cf11afSPaul Mackerras1: addi r3,r1,STACK_FRAME_OVERHEAD 45014cf11afSPaul Mackerras bl .kernel_bad_stack 45114cf11afSPaul Mackerras b 1b 45214cf11afSPaul Mackerras 45314cf11afSPaul Mackerras/* 45414cf11afSPaul Mackerras * Return from an exception with minimal checks. 45514cf11afSPaul Mackerras * The caller is assumed to have done EXCEPTION_PROLOG_COMMON. 45614cf11afSPaul Mackerras * If interrupts have been enabled, or anything has been 45714cf11afSPaul Mackerras * done that might have changed the scheduling status of 45814cf11afSPaul Mackerras * any task or sent any task a signal, you should use 45914cf11afSPaul Mackerras * ret_from_except or ret_from_except_lite instead of this. 46014cf11afSPaul Mackerras */ 461b0a779deSPaul Mackerrasfast_exc_return_irq: /* restores irq state too */ 462b0a779deSPaul Mackerras ld r3,SOFTE(r1) 463945feb17SBenjamin Herrenschmidt TRACE_AND_RESTORE_IRQ(r3); 464b0a779deSPaul Mackerras ld r12,_MSR(r1) 465b0a779deSPaul Mackerras rldicl r4,r12,49,63 /* get MSR_EE to LSB */ 466b0a779deSPaul Mackerras stb r4,PACAHARDIRQEN(r13) /* restore paca->hard_enabled */ 467b0a779deSPaul Mackerras b 1f 468b0a779deSPaul Mackerras 46940ef8cbcSPaul Mackerras .globl fast_exception_return 47014cf11afSPaul Mackerrasfast_exception_return: 47114cf11afSPaul Mackerras ld r12,_MSR(r1) 472b0a779deSPaul Mackerras1: ld r11,_NIP(r1) 47314cf11afSPaul Mackerras andi. r3,r12,MSR_RI /* check if RI is set */ 47414cf11afSPaul Mackerras beq- unrecov_fer 475c6622f63SPaul Mackerras 476c6622f63SPaul Mackerras#ifdef CONFIG_VIRT_CPU_ACCOUNTING 477c6622f63SPaul Mackerras andi. r3,r12,MSR_PR 478c6622f63SPaul Mackerras beq 2f 479c6622f63SPaul Mackerras ACCOUNT_CPU_USER_EXIT(r3, r4) 480c6622f63SPaul Mackerras2: 481c6622f63SPaul Mackerras#endif 482c6622f63SPaul Mackerras 48314cf11afSPaul Mackerras ld r3,_CCR(r1) 48414cf11afSPaul Mackerras ld r4,_LINK(r1) 48514cf11afSPaul Mackerras ld r5,_CTR(r1) 48614cf11afSPaul Mackerras ld r6,_XER(r1) 48714cf11afSPaul Mackerras mtcr r3 48814cf11afSPaul Mackerras mtlr r4 48914cf11afSPaul Mackerras mtctr r5 49014cf11afSPaul Mackerras mtxer r6 49114cf11afSPaul Mackerras REST_GPR(0, r1) 49214cf11afSPaul Mackerras REST_8GPRS(2, r1) 49314cf11afSPaul Mackerras 49414cf11afSPaul Mackerras mfmsr r10 495d04c56f7SPaul Mackerras rldicl r10,r10,48,1 /* clear EE */ 496d04c56f7SPaul Mackerras rldicr r10,r10,16,61 /* clear RI (LE is 0 already) */ 49714cf11afSPaul Mackerras mtmsrd r10,1 49814cf11afSPaul Mackerras 499b5bbeb23SPaul Mackerras mtspr SPRN_SRR1,r12 500b5bbeb23SPaul Mackerras mtspr SPRN_SRR0,r11 50114cf11afSPaul Mackerras REST_4GPRS(10, r1) 50214cf11afSPaul Mackerras ld r1,GPR1(r1) 50314cf11afSPaul Mackerras rfid 50414cf11afSPaul Mackerras b . /* prevent speculative execution */ 50514cf11afSPaul Mackerras 50614cf11afSPaul Mackerrasunrecov_fer: 50714cf11afSPaul Mackerras bl .save_nvgprs 50814cf11afSPaul Mackerras1: addi r3,r1,STACK_FRAME_OVERHEAD 50914cf11afSPaul Mackerras bl .unrecoverable_exception 51014cf11afSPaul Mackerras b 1b 51114cf11afSPaul Mackerras 51214cf11afSPaul Mackerras/* 51314cf11afSPaul Mackerras * Here r13 points to the paca, r9 contains the saved CR, 51414cf11afSPaul Mackerras * SRR0 and SRR1 are saved in r11 and r12, 51514cf11afSPaul Mackerras * r9 - r13 are saved in paca->exgen. 51614cf11afSPaul Mackerras */ 51714cf11afSPaul Mackerras .align 7 51814cf11afSPaul Mackerras .globl data_access_common 51914cf11afSPaul Mackerrasdata_access_common: 520b5bbeb23SPaul Mackerras mfspr r10,SPRN_DAR 52114cf11afSPaul Mackerras std r10,PACA_EXGEN+EX_DAR(r13) 522b5bbeb23SPaul Mackerras mfspr r10,SPRN_DSISR 52314cf11afSPaul Mackerras stw r10,PACA_EXGEN+EX_DSISR(r13) 52414cf11afSPaul Mackerras EXCEPTION_PROLOG_COMMON(0x300, PACA_EXGEN) 52514cf11afSPaul Mackerras ld r3,PACA_EXGEN+EX_DAR(r13) 52614cf11afSPaul Mackerras lwz r4,PACA_EXGEN+EX_DSISR(r13) 52714cf11afSPaul Mackerras li r5,0x300 52814cf11afSPaul Mackerras b .do_hash_page /* Try to handle as hpte fault */ 52914cf11afSPaul Mackerras 53014cf11afSPaul Mackerras .align 7 53114cf11afSPaul Mackerras .globl instruction_access_common 53214cf11afSPaul Mackerrasinstruction_access_common: 53314cf11afSPaul Mackerras EXCEPTION_PROLOG_COMMON(0x400, PACA_EXGEN) 53414cf11afSPaul Mackerras ld r3,_NIP(r1) 53514cf11afSPaul Mackerras andis. r4,r12,0x5820 53614cf11afSPaul Mackerras li r5,0x400 53714cf11afSPaul Mackerras b .do_hash_page /* Try to handle as hpte fault */ 53814cf11afSPaul Mackerras 5393c726f8dSBenjamin Herrenschmidt/* 5403c726f8dSBenjamin Herrenschmidt * Here is the common SLB miss user that is used when going to virtual 5413c726f8dSBenjamin Herrenschmidt * mode for SLB misses, that is currently not used 5423c726f8dSBenjamin Herrenschmidt */ 5433c726f8dSBenjamin Herrenschmidt#ifdef __DISABLED__ 5443c726f8dSBenjamin Herrenschmidt .align 7 5453c726f8dSBenjamin Herrenschmidt .globl slb_miss_user_common 5463c726f8dSBenjamin Herrenschmidtslb_miss_user_common: 5473c726f8dSBenjamin Herrenschmidt mflr r10 5483c726f8dSBenjamin Herrenschmidt std r3,PACA_EXGEN+EX_DAR(r13) 5493c726f8dSBenjamin Herrenschmidt stw r9,PACA_EXGEN+EX_CCR(r13) 5503c726f8dSBenjamin Herrenschmidt std r10,PACA_EXGEN+EX_LR(r13) 5513c726f8dSBenjamin Herrenschmidt std r11,PACA_EXGEN+EX_SRR0(r13) 5523c726f8dSBenjamin Herrenschmidt bl .slb_allocate_user 5533c726f8dSBenjamin Herrenschmidt 5543c726f8dSBenjamin Herrenschmidt ld r10,PACA_EXGEN+EX_LR(r13) 5553c726f8dSBenjamin Herrenschmidt ld r3,PACA_EXGEN+EX_R3(r13) 5563c726f8dSBenjamin Herrenschmidt lwz r9,PACA_EXGEN+EX_CCR(r13) 5573c726f8dSBenjamin Herrenschmidt ld r11,PACA_EXGEN+EX_SRR0(r13) 5583c726f8dSBenjamin Herrenschmidt mtlr r10 5593c726f8dSBenjamin Herrenschmidt beq- slb_miss_fault 5603c726f8dSBenjamin Herrenschmidt 5613c726f8dSBenjamin Herrenschmidt andi. r10,r12,MSR_RI /* check for unrecoverable exception */ 5623c726f8dSBenjamin Herrenschmidt beq- unrecov_user_slb 5633c726f8dSBenjamin Herrenschmidt mfmsr r10 5643c726f8dSBenjamin Herrenschmidt 5653c726f8dSBenjamin Herrenschmidt.machine push 5663c726f8dSBenjamin Herrenschmidt.machine "power4" 5673c726f8dSBenjamin Herrenschmidt mtcrf 0x80,r9 5683c726f8dSBenjamin Herrenschmidt.machine pop 5693c726f8dSBenjamin Herrenschmidt 5703c726f8dSBenjamin Herrenschmidt clrrdi r10,r10,2 /* clear RI before setting SRR0/1 */ 5713c726f8dSBenjamin Herrenschmidt mtmsrd r10,1 5723c726f8dSBenjamin Herrenschmidt 5733c726f8dSBenjamin Herrenschmidt mtspr SRR0,r11 5743c726f8dSBenjamin Herrenschmidt mtspr SRR1,r12 5753c726f8dSBenjamin Herrenschmidt 5763c726f8dSBenjamin Herrenschmidt ld r9,PACA_EXGEN+EX_R9(r13) 5773c726f8dSBenjamin Herrenschmidt ld r10,PACA_EXGEN+EX_R10(r13) 5783c726f8dSBenjamin Herrenschmidt ld r11,PACA_EXGEN+EX_R11(r13) 5793c726f8dSBenjamin Herrenschmidt ld r12,PACA_EXGEN+EX_R12(r13) 5803c726f8dSBenjamin Herrenschmidt ld r13,PACA_EXGEN+EX_R13(r13) 5813c726f8dSBenjamin Herrenschmidt rfid 5823c726f8dSBenjamin Herrenschmidt b . 5833c726f8dSBenjamin Herrenschmidt 5843c726f8dSBenjamin Herrenschmidtslb_miss_fault: 5853c726f8dSBenjamin Herrenschmidt EXCEPTION_PROLOG_COMMON(0x380, PACA_EXGEN) 5863c726f8dSBenjamin Herrenschmidt ld r4,PACA_EXGEN+EX_DAR(r13) 5873c726f8dSBenjamin Herrenschmidt li r5,0 5883c726f8dSBenjamin Herrenschmidt std r4,_DAR(r1) 5893c726f8dSBenjamin Herrenschmidt std r5,_DSISR(r1) 5903ccfc65cSPaul Mackerras b handle_page_fault 5913c726f8dSBenjamin Herrenschmidt 5923c726f8dSBenjamin Herrenschmidtunrecov_user_slb: 5933c726f8dSBenjamin Herrenschmidt EXCEPTION_PROLOG_COMMON(0x4200, PACA_EXGEN) 5943c726f8dSBenjamin Herrenschmidt DISABLE_INTS 5953c726f8dSBenjamin Herrenschmidt bl .save_nvgprs 5963c726f8dSBenjamin Herrenschmidt1: addi r3,r1,STACK_FRAME_OVERHEAD 5973c726f8dSBenjamin Herrenschmidt bl .unrecoverable_exception 5983c726f8dSBenjamin Herrenschmidt b 1b 5993c726f8dSBenjamin Herrenschmidt 6003c726f8dSBenjamin Herrenschmidt#endif /* __DISABLED__ */ 6013c726f8dSBenjamin Herrenschmidt 6023c726f8dSBenjamin Herrenschmidt 6033c726f8dSBenjamin Herrenschmidt/* 6043c726f8dSBenjamin Herrenschmidt * r13 points to the PACA, r9 contains the saved CR, 6053c726f8dSBenjamin Herrenschmidt * r12 contain the saved SRR1, SRR0 is still ready for return 6063c726f8dSBenjamin Herrenschmidt * r3 has the faulting address 6073c726f8dSBenjamin Herrenschmidt * r9 - r13 are saved in paca->exslb. 6083c726f8dSBenjamin Herrenschmidt * r3 is saved in paca->slb_r3 6093c726f8dSBenjamin Herrenschmidt * We assume we aren't going to take any exceptions during this procedure. 6103c726f8dSBenjamin Herrenschmidt */ 6113c726f8dSBenjamin Herrenschmidt_GLOBAL(slb_miss_realmode) 6123c726f8dSBenjamin Herrenschmidt mflr r10 6133c726f8dSBenjamin Herrenschmidt 6143c726f8dSBenjamin Herrenschmidt stw r9,PACA_EXSLB+EX_CCR(r13) /* save CR in exc. frame */ 6153c726f8dSBenjamin Herrenschmidt std r10,PACA_EXSLB+EX_LR(r13) /* save LR */ 6163c726f8dSBenjamin Herrenschmidt 6173c726f8dSBenjamin Herrenschmidt bl .slb_allocate_realmode 6183c726f8dSBenjamin Herrenschmidt 6193c726f8dSBenjamin Herrenschmidt /* All done -- return from exception. */ 6203c726f8dSBenjamin Herrenschmidt 6213c726f8dSBenjamin Herrenschmidt ld r10,PACA_EXSLB+EX_LR(r13) 6223c726f8dSBenjamin Herrenschmidt ld r3,PACA_EXSLB+EX_R3(r13) 6233c726f8dSBenjamin Herrenschmidt lwz r9,PACA_EXSLB+EX_CCR(r13) /* get saved CR */ 6243c726f8dSBenjamin Herrenschmidt#ifdef CONFIG_PPC_ISERIES 6253f639ee8SStephen RothwellBEGIN_FW_FTR_SECTION 6263356bb9fSDavid Gibson ld r11,PACALPPACAPTR(r13) 6273356bb9fSDavid Gibson ld r11,LPPACASRR0(r11) /* get SRR0 value */ 6283f639ee8SStephen RothwellEND_FW_FTR_SECTION_IFSET(FW_FEATURE_ISERIES) 6293c726f8dSBenjamin Herrenschmidt#endif /* CONFIG_PPC_ISERIES */ 6303c726f8dSBenjamin Herrenschmidt 6313c726f8dSBenjamin Herrenschmidt mtlr r10 6323c726f8dSBenjamin Herrenschmidt 6333c726f8dSBenjamin Herrenschmidt andi. r10,r12,MSR_RI /* check for unrecoverable exception */ 634320787c7SPaul Mackerras beq- 2f 6353c726f8dSBenjamin Herrenschmidt 6363c726f8dSBenjamin Herrenschmidt.machine push 6373c726f8dSBenjamin Herrenschmidt.machine "power4" 6383c726f8dSBenjamin Herrenschmidt mtcrf 0x80,r9 6393c726f8dSBenjamin Herrenschmidt mtcrf 0x01,r9 /* slb_allocate uses cr0 and cr7 */ 6403c726f8dSBenjamin Herrenschmidt.machine pop 6413c726f8dSBenjamin Herrenschmidt 6423c726f8dSBenjamin Herrenschmidt#ifdef CONFIG_PPC_ISERIES 6433f639ee8SStephen RothwellBEGIN_FW_FTR_SECTION 6443c726f8dSBenjamin Herrenschmidt mtspr SPRN_SRR0,r11 6453c726f8dSBenjamin Herrenschmidt mtspr SPRN_SRR1,r12 6463f639ee8SStephen RothwellEND_FW_FTR_SECTION_IFSET(FW_FEATURE_ISERIES) 6473c726f8dSBenjamin Herrenschmidt#endif /* CONFIG_PPC_ISERIES */ 6483c726f8dSBenjamin Herrenschmidt ld r9,PACA_EXSLB+EX_R9(r13) 6493c726f8dSBenjamin Herrenschmidt ld r10,PACA_EXSLB+EX_R10(r13) 6503c726f8dSBenjamin Herrenschmidt ld r11,PACA_EXSLB+EX_R11(r13) 6513c726f8dSBenjamin Herrenschmidt ld r12,PACA_EXSLB+EX_R12(r13) 6523c726f8dSBenjamin Herrenschmidt ld r13,PACA_EXSLB+EX_R13(r13) 6533c726f8dSBenjamin Herrenschmidt rfid 6543c726f8dSBenjamin Herrenschmidt b . /* prevent speculative execution */ 6553c726f8dSBenjamin Herrenschmidt 656320787c7SPaul Mackerras2: 657320787c7SPaul Mackerras#ifdef CONFIG_PPC_ISERIES 658320787c7SPaul MackerrasBEGIN_FW_FTR_SECTION 659320787c7SPaul Mackerras b unrecov_slb 660320787c7SPaul MackerrasEND_FW_FTR_SECTION_IFSET(FW_FEATURE_ISERIES) 661320787c7SPaul Mackerras#endif /* CONFIG_PPC_ISERIES */ 662320787c7SPaul Mackerras mfspr r11,SPRN_SRR0 663320787c7SPaul Mackerras clrrdi r10,r13,32 664320787c7SPaul Mackerras LOAD_HANDLER(r10,unrecov_slb) 665320787c7SPaul Mackerras mtspr SPRN_SRR0,r10 666320787c7SPaul Mackerras mfmsr r10 667320787c7SPaul Mackerras ori r10,r10,MSR_IR|MSR_DR|MSR_RI 668320787c7SPaul Mackerras mtspr SPRN_SRR1,r10 669320787c7SPaul Mackerras rfid 670320787c7SPaul Mackerras b . 671320787c7SPaul Mackerras 6723c726f8dSBenjamin Herrenschmidtunrecov_slb: 6733c726f8dSBenjamin Herrenschmidt EXCEPTION_PROLOG_COMMON(0x4100, PACA_EXSLB) 6743c726f8dSBenjamin Herrenschmidt DISABLE_INTS 6753c726f8dSBenjamin Herrenschmidt bl .save_nvgprs 6763c726f8dSBenjamin Herrenschmidt1: addi r3,r1,STACK_FRAME_OVERHEAD 6773c726f8dSBenjamin Herrenschmidt bl .unrecoverable_exception 6783c726f8dSBenjamin Herrenschmidt b 1b 6793c726f8dSBenjamin Herrenschmidt 68014cf11afSPaul Mackerras .align 7 68114cf11afSPaul Mackerras .globl hardware_interrupt_common 68214cf11afSPaul Mackerras .globl hardware_interrupt_entry 68314cf11afSPaul Mackerrashardware_interrupt_common: 68414cf11afSPaul Mackerras EXCEPTION_PROLOG_COMMON(0x500, PACA_EXGEN) 685f39224a8SPaul Mackerras FINISH_NAP 68614cf11afSPaul Mackerrashardware_interrupt_entry: 68714cf11afSPaul Mackerras DISABLE_INTS 688a416561bSOlof JohanssonBEGIN_FTR_SECTION 689cb2c9b27SAnton Blanchard bl .ppc64_runlatch_on 690a416561bSOlof JohanssonEND_FTR_SECTION_IFSET(CPU_FTR_CTRL) 69114cf11afSPaul Mackerras addi r3,r1,STACK_FRAME_OVERHEAD 69214cf11afSPaul Mackerras bl .do_IRQ 69314cf11afSPaul Mackerras b .ret_from_except_lite 69414cf11afSPaul Mackerras 695f39224a8SPaul Mackerras#ifdef CONFIG_PPC_970_NAP 696f39224a8SPaul Mackerraspower4_fixup_nap: 697f39224a8SPaul Mackerras andc r9,r9,r10 698f39224a8SPaul Mackerras std r9,TI_LOCAL_FLAGS(r11) 699f39224a8SPaul Mackerras ld r10,_LINK(r1) /* make idle task do the */ 700f39224a8SPaul Mackerras std r10,_NIP(r1) /* equivalent of a blr */ 701f39224a8SPaul Mackerras blr 702f39224a8SPaul Mackerras#endif 703f39224a8SPaul Mackerras 70414cf11afSPaul Mackerras .align 7 70514cf11afSPaul Mackerras .globl alignment_common 70614cf11afSPaul Mackerrasalignment_common: 707b5bbeb23SPaul Mackerras mfspr r10,SPRN_DAR 70814cf11afSPaul Mackerras std r10,PACA_EXGEN+EX_DAR(r13) 709b5bbeb23SPaul Mackerras mfspr r10,SPRN_DSISR 71014cf11afSPaul Mackerras stw r10,PACA_EXGEN+EX_DSISR(r13) 71114cf11afSPaul Mackerras EXCEPTION_PROLOG_COMMON(0x600, PACA_EXGEN) 71214cf11afSPaul Mackerras ld r3,PACA_EXGEN+EX_DAR(r13) 71314cf11afSPaul Mackerras lwz r4,PACA_EXGEN+EX_DSISR(r13) 71414cf11afSPaul Mackerras std r3,_DAR(r1) 71514cf11afSPaul Mackerras std r4,_DSISR(r1) 71614cf11afSPaul Mackerras bl .save_nvgprs 71714cf11afSPaul Mackerras addi r3,r1,STACK_FRAME_OVERHEAD 71814cf11afSPaul Mackerras ENABLE_INTS 71914cf11afSPaul Mackerras bl .alignment_exception 72014cf11afSPaul Mackerras b .ret_from_except 72114cf11afSPaul Mackerras 72214cf11afSPaul Mackerras .align 7 72314cf11afSPaul Mackerras .globl program_check_common 72414cf11afSPaul Mackerrasprogram_check_common: 72514cf11afSPaul Mackerras EXCEPTION_PROLOG_COMMON(0x700, PACA_EXGEN) 72614cf11afSPaul Mackerras bl .save_nvgprs 72714cf11afSPaul Mackerras addi r3,r1,STACK_FRAME_OVERHEAD 72814cf11afSPaul Mackerras ENABLE_INTS 72914cf11afSPaul Mackerras bl .program_check_exception 73014cf11afSPaul Mackerras b .ret_from_except 73114cf11afSPaul Mackerras 73214cf11afSPaul Mackerras .align 7 73314cf11afSPaul Mackerras .globl fp_unavailable_common 73414cf11afSPaul Mackerrasfp_unavailable_common: 73514cf11afSPaul Mackerras EXCEPTION_PROLOG_COMMON(0x800, PACA_EXGEN) 7363ccfc65cSPaul Mackerras bne 1f /* if from user, just load it up */ 73714cf11afSPaul Mackerras bl .save_nvgprs 73814cf11afSPaul Mackerras addi r3,r1,STACK_FRAME_OVERHEAD 73914cf11afSPaul Mackerras ENABLE_INTS 74014cf11afSPaul Mackerras bl .kernel_fp_unavailable_exception 74114cf11afSPaul Mackerras BUG_OPCODE 7423ccfc65cSPaul Mackerras1: b .load_up_fpu 74314cf11afSPaul Mackerras 74414cf11afSPaul Mackerras .align 7 74514cf11afSPaul Mackerras .globl altivec_unavailable_common 74614cf11afSPaul Mackerrasaltivec_unavailable_common: 74714cf11afSPaul Mackerras EXCEPTION_PROLOG_COMMON(0xf20, PACA_EXGEN) 74814cf11afSPaul Mackerras#ifdef CONFIG_ALTIVEC 74914cf11afSPaul MackerrasBEGIN_FTR_SECTION 75014cf11afSPaul Mackerras bne .load_up_altivec /* if from user, just load it up */ 75114cf11afSPaul MackerrasEND_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC) 75214cf11afSPaul Mackerras#endif 75314cf11afSPaul Mackerras bl .save_nvgprs 75414cf11afSPaul Mackerras addi r3,r1,STACK_FRAME_OVERHEAD 75514cf11afSPaul Mackerras ENABLE_INTS 75614cf11afSPaul Mackerras bl .altivec_unavailable_exception 75714cf11afSPaul Mackerras b .ret_from_except 75814cf11afSPaul Mackerras 75914cf11afSPaul Mackerras#ifdef CONFIG_ALTIVEC 76014cf11afSPaul Mackerras/* 76114cf11afSPaul Mackerras * load_up_altivec(unused, unused, tsk) 76214cf11afSPaul Mackerras * Disable VMX for the task which had it previously, 76314cf11afSPaul Mackerras * and save its vector registers in its thread_struct. 76414cf11afSPaul Mackerras * Enables the VMX for use in the kernel on return. 76514cf11afSPaul Mackerras * On SMP we know the VMX is free, since we give it up every 76614cf11afSPaul Mackerras * switch (ie, no lazy save of the vector registers). 76714cf11afSPaul Mackerras * On entry: r13 == 'current' && last_task_used_altivec != 'current' 76814cf11afSPaul Mackerras */ 76914cf11afSPaul Mackerras_STATIC(load_up_altivec) 77014cf11afSPaul Mackerras mfmsr r5 /* grab the current MSR */ 77114cf11afSPaul Mackerras oris r5,r5,MSR_VEC@h 77214cf11afSPaul Mackerras mtmsrd r5 /* enable use of VMX now */ 77314cf11afSPaul Mackerras isync 77414cf11afSPaul Mackerras 77514cf11afSPaul Mackerras/* 77614cf11afSPaul Mackerras * For SMP, we don't do lazy VMX switching because it just gets too 77714cf11afSPaul Mackerras * horrendously complex, especially when a task switches from one CPU 77814cf11afSPaul Mackerras * to another. Instead we call giveup_altvec in switch_to. 77914cf11afSPaul Mackerras * VRSAVE isn't dealt with here, that is done in the normal context 78014cf11afSPaul Mackerras * switch code. Note that we could rely on vrsave value to eventually 78114cf11afSPaul Mackerras * avoid saving all of the VREGs here... 78214cf11afSPaul Mackerras */ 78314cf11afSPaul Mackerras#ifndef CONFIG_SMP 78414cf11afSPaul Mackerras ld r3,last_task_used_altivec@got(r2) 78514cf11afSPaul Mackerras ld r4,0(r3) 78614cf11afSPaul Mackerras cmpdi 0,r4,0 78714cf11afSPaul Mackerras beq 1f 78814cf11afSPaul Mackerras /* Save VMX state to last_task_used_altivec's THREAD struct */ 78914cf11afSPaul Mackerras addi r4,r4,THREAD 79014cf11afSPaul Mackerras SAVE_32VRS(0,r5,r4) 79114cf11afSPaul Mackerras mfvscr vr0 79214cf11afSPaul Mackerras li r10,THREAD_VSCR 79314cf11afSPaul Mackerras stvx vr0,r10,r4 79414cf11afSPaul Mackerras /* Disable VMX for last_task_used_altivec */ 79514cf11afSPaul Mackerras ld r5,PT_REGS(r4) 79614cf11afSPaul Mackerras ld r4,_MSR-STACK_FRAME_OVERHEAD(r5) 79714cf11afSPaul Mackerras lis r6,MSR_VEC@h 79814cf11afSPaul Mackerras andc r4,r4,r6 79914cf11afSPaul Mackerras std r4,_MSR-STACK_FRAME_OVERHEAD(r5) 80014cf11afSPaul Mackerras1: 80114cf11afSPaul Mackerras#endif /* CONFIG_SMP */ 80214cf11afSPaul Mackerras /* Hack: if we get an altivec unavailable trap with VRSAVE 80314cf11afSPaul Mackerras * set to all zeros, we assume this is a broken application 80414cf11afSPaul Mackerras * that fails to set it properly, and thus we switch it to 80514cf11afSPaul Mackerras * all 1's 80614cf11afSPaul Mackerras */ 80714cf11afSPaul Mackerras mfspr r4,SPRN_VRSAVE 80814cf11afSPaul Mackerras cmpdi 0,r4,0 80914cf11afSPaul Mackerras bne+ 1f 81014cf11afSPaul Mackerras li r4,-1 81114cf11afSPaul Mackerras mtspr SPRN_VRSAVE,r4 81214cf11afSPaul Mackerras1: 81314cf11afSPaul Mackerras /* enable use of VMX after return */ 81414cf11afSPaul Mackerras ld r4,PACACURRENT(r13) 81514cf11afSPaul Mackerras addi r5,r4,THREAD /* Get THREAD */ 81614cf11afSPaul Mackerras oris r12,r12,MSR_VEC@h 81714cf11afSPaul Mackerras std r12,_MSR(r1) 81814cf11afSPaul Mackerras li r4,1 81914cf11afSPaul Mackerras li r10,THREAD_VSCR 82014cf11afSPaul Mackerras stw r4,THREAD_USED_VR(r5) 82114cf11afSPaul Mackerras lvx vr0,r10,r5 82214cf11afSPaul Mackerras mtvscr vr0 82314cf11afSPaul Mackerras REST_32VRS(0,r4,r5) 82414cf11afSPaul Mackerras#ifndef CONFIG_SMP 82514cf11afSPaul Mackerras /* Update last_task_used_math to 'current' */ 82614cf11afSPaul Mackerras subi r4,r5,THREAD /* Back to 'current' */ 82714cf11afSPaul Mackerras std r4,0(r3) 82814cf11afSPaul Mackerras#endif /* CONFIG_SMP */ 82914cf11afSPaul Mackerras /* restore registers and return */ 83014cf11afSPaul Mackerras b fast_exception_return 83114cf11afSPaul Mackerras#endif /* CONFIG_ALTIVEC */ 83214cf11afSPaul Mackerras 83314cf11afSPaul Mackerras/* 83414cf11afSPaul Mackerras * Hash table stuff 83514cf11afSPaul Mackerras */ 83614cf11afSPaul Mackerras .align 7 837945feb17SBenjamin Herrenschmidt_STATIC(do_hash_page) 83814cf11afSPaul Mackerras std r3,_DAR(r1) 83914cf11afSPaul Mackerras std r4,_DSISR(r1) 84014cf11afSPaul Mackerras 84114cf11afSPaul Mackerras andis. r0,r4,0xa450 /* weird error? */ 8423ccfc65cSPaul Mackerras bne- handle_page_fault /* if not, try to insert a HPTE */ 84314cf11afSPaul MackerrasBEGIN_FTR_SECTION 84414cf11afSPaul Mackerras andis. r0,r4,0x0020 /* Is it a segment table fault? */ 8453ccfc65cSPaul Mackerras bne- do_ste_alloc /* If so handle it */ 84614cf11afSPaul MackerrasEND_FTR_SECTION_IFCLR(CPU_FTR_SLB) 84714cf11afSPaul Mackerras 84814cf11afSPaul Mackerras /* 849945feb17SBenjamin Herrenschmidt * On iSeries, we soft-disable interrupts here, then 850945feb17SBenjamin Herrenschmidt * hard-enable interrupts so that the hash_page code can spin on 851945feb17SBenjamin Herrenschmidt * the hash_table_lock without problems on a shared processor. 852945feb17SBenjamin Herrenschmidt */ 853945feb17SBenjamin Herrenschmidt DISABLE_INTS 854945feb17SBenjamin Herrenschmidt 855945feb17SBenjamin Herrenschmidt /* 856945feb17SBenjamin Herrenschmidt * Currently, trace_hardirqs_off() will be called by DISABLE_INTS 857945feb17SBenjamin Herrenschmidt * and will clobber volatile registers when irq tracing is enabled 858945feb17SBenjamin Herrenschmidt * so we need to reload them. It may be possible to be smarter here 859945feb17SBenjamin Herrenschmidt * and move the irq tracing elsewhere but let's keep it simple for 860945feb17SBenjamin Herrenschmidt * now 861945feb17SBenjamin Herrenschmidt */ 862945feb17SBenjamin Herrenschmidt#ifdef CONFIG_TRACE_IRQFLAGS 863945feb17SBenjamin Herrenschmidt ld r3,_DAR(r1) 864945feb17SBenjamin Herrenschmidt ld r4,_DSISR(r1) 865945feb17SBenjamin Herrenschmidt ld r5,_TRAP(r1) 866945feb17SBenjamin Herrenschmidt ld r12,_MSR(r1) 867945feb17SBenjamin Herrenschmidt clrrdi r5,r5,4 868945feb17SBenjamin Herrenschmidt#endif /* CONFIG_TRACE_IRQFLAGS */ 869945feb17SBenjamin Herrenschmidt /* 87014cf11afSPaul Mackerras * We need to set the _PAGE_USER bit if MSR_PR is set or if we are 87114cf11afSPaul Mackerras * accessing a userspace segment (even from the kernel). We assume 87214cf11afSPaul Mackerras * kernel addresses always have the high bit set. 87314cf11afSPaul Mackerras */ 87414cf11afSPaul Mackerras rlwinm r4,r4,32-25+9,31-9,31-9 /* DSISR_STORE -> _PAGE_RW */ 87514cf11afSPaul Mackerras rotldi r0,r3,15 /* Move high bit into MSR_PR posn */ 87614cf11afSPaul Mackerras orc r0,r12,r0 /* MSR_PR | ~high_bit */ 87714cf11afSPaul Mackerras rlwimi r4,r0,32-13,30,30 /* becomes _PAGE_USER access bit */ 87814cf11afSPaul Mackerras ori r4,r4,1 /* add _PAGE_PRESENT */ 87914cf11afSPaul Mackerras rlwimi r4,r5,22+2,31-2,31-2 /* Set _PAGE_EXEC if trap is 0x400 */ 88014cf11afSPaul Mackerras 88114cf11afSPaul Mackerras /* 88214cf11afSPaul Mackerras * r3 contains the faulting address 88314cf11afSPaul Mackerras * r4 contains the required access permissions 88414cf11afSPaul Mackerras * r5 contains the trap number 88514cf11afSPaul Mackerras * 88614cf11afSPaul Mackerras * at return r3 = 0 for success 88714cf11afSPaul Mackerras */ 88814cf11afSPaul Mackerras bl .hash_page /* build HPTE if possible */ 88914cf11afSPaul Mackerras cmpdi r3,0 /* see if hash_page succeeded */ 89014cf11afSPaul Mackerras 8913f639ee8SStephen RothwellBEGIN_FW_FTR_SECTION 89214cf11afSPaul Mackerras /* 89314cf11afSPaul Mackerras * If we had interrupts soft-enabled at the point where the 89414cf11afSPaul Mackerras * DSI/ISI occurred, and an interrupt came in during hash_page, 89514cf11afSPaul Mackerras * handle it now. 89614cf11afSPaul Mackerras * We jump to ret_from_except_lite rather than fast_exception_return 89714cf11afSPaul Mackerras * because ret_from_except_lite will check for and handle pending 89814cf11afSPaul Mackerras * interrupts if necessary. 89914cf11afSPaul Mackerras */ 9003ccfc65cSPaul Mackerras beq 13f 901b0a779deSPaul MackerrasEND_FW_FTR_SECTION_IFSET(FW_FEATURE_ISERIES) 902945feb17SBenjamin Herrenschmidt 903b0a779deSPaul MackerrasBEGIN_FW_FTR_SECTION 904b0a779deSPaul Mackerras /* 905b0a779deSPaul Mackerras * Here we have interrupts hard-disabled, so it is sufficient 906b0a779deSPaul Mackerras * to restore paca->{soft,hard}_enable and get out. 907b0a779deSPaul Mackerras */ 908b0a779deSPaul Mackerras beq fast_exc_return_irq /* Return from exception on success */ 909b0a779deSPaul MackerrasEND_FW_FTR_SECTION_IFCLR(FW_FEATURE_ISERIES) 910b0a779deSPaul Mackerras 91114cf11afSPaul Mackerras /* For a hash failure, we don't bother re-enabling interrupts */ 91214cf11afSPaul Mackerras ble- 12f 91314cf11afSPaul Mackerras 91414cf11afSPaul Mackerras /* 91514cf11afSPaul Mackerras * hash_page couldn't handle it, set soft interrupt enable back 916945feb17SBenjamin Herrenschmidt * to what it was before the trap. Note that .raw_local_irq_restore 91714cf11afSPaul Mackerras * handles any interrupts pending at this point. 91814cf11afSPaul Mackerras */ 91914cf11afSPaul Mackerras ld r3,SOFTE(r1) 920945feb17SBenjamin Herrenschmidt TRACE_AND_RESTORE_IRQ_PARTIAL(r3, 11f) 921945feb17SBenjamin Herrenschmidt bl .raw_local_irq_restore 92214cf11afSPaul Mackerras b 11f 92314cf11afSPaul Mackerras 92414cf11afSPaul Mackerras/* Here we have a page fault that hash_page can't handle. */ 9253ccfc65cSPaul Mackerrashandle_page_fault: 92614cf11afSPaul Mackerras ENABLE_INTS 92714cf11afSPaul Mackerras11: ld r4,_DAR(r1) 92814cf11afSPaul Mackerras ld r5,_DSISR(r1) 92914cf11afSPaul Mackerras addi r3,r1,STACK_FRAME_OVERHEAD 93014cf11afSPaul Mackerras bl .do_page_fault 93114cf11afSPaul Mackerras cmpdi r3,0 9323ccfc65cSPaul Mackerras beq+ 13f 93314cf11afSPaul Mackerras bl .save_nvgprs 93414cf11afSPaul Mackerras mr r5,r3 93514cf11afSPaul Mackerras addi r3,r1,STACK_FRAME_OVERHEAD 93614cf11afSPaul Mackerras lwz r4,_DAR(r1) 93714cf11afSPaul Mackerras bl .bad_page_fault 93814cf11afSPaul Mackerras b .ret_from_except 93914cf11afSPaul Mackerras 94079acbb3fSPaul Mackerras13: b .ret_from_except_lite 94179acbb3fSPaul Mackerras 94214cf11afSPaul Mackerras/* We have a page fault that hash_page could handle but HV refused 94314cf11afSPaul Mackerras * the PTE insertion 94414cf11afSPaul Mackerras */ 94514cf11afSPaul Mackerras12: bl .save_nvgprs 946fa28237cSPaul Mackerras mr r5,r3 94714cf11afSPaul Mackerras addi r3,r1,STACK_FRAME_OVERHEAD 948a792e75dSBenjamin Herrenschmidt ld r4,_DAR(r1) 94914cf11afSPaul Mackerras bl .low_hash_fault 95014cf11afSPaul Mackerras b .ret_from_except 95114cf11afSPaul Mackerras 95214cf11afSPaul Mackerras /* here we have a segment miss */ 9533ccfc65cSPaul Mackerrasdo_ste_alloc: 95414cf11afSPaul Mackerras bl .ste_allocate /* try to insert stab entry */ 95514cf11afSPaul Mackerras cmpdi r3,0 9563ccfc65cSPaul Mackerras bne- handle_page_fault 9573ccfc65cSPaul Mackerras b fast_exception_return 95814cf11afSPaul Mackerras 95914cf11afSPaul Mackerras/* 96014cf11afSPaul Mackerras * r13 points to the PACA, r9 contains the saved CR, 96114cf11afSPaul Mackerras * r11 and r12 contain the saved SRR0 and SRR1. 96214cf11afSPaul Mackerras * r9 - r13 are saved in paca->exslb. 96314cf11afSPaul Mackerras * We assume we aren't going to take any exceptions during this procedure. 96414cf11afSPaul Mackerras * We assume (DAR >> 60) == 0xc. 96514cf11afSPaul Mackerras */ 96614cf11afSPaul Mackerras .align 7 96714cf11afSPaul Mackerras_GLOBAL(do_stab_bolted) 96814cf11afSPaul Mackerras stw r9,PACA_EXSLB+EX_CCR(r13) /* save CR in exc. frame */ 96914cf11afSPaul Mackerras std r11,PACA_EXSLB+EX_SRR0(r13) /* save SRR0 in exc. frame */ 97014cf11afSPaul Mackerras 97114cf11afSPaul Mackerras /* Hash to the primary group */ 97214cf11afSPaul Mackerras ld r10,PACASTABVIRT(r13) 973b5bbeb23SPaul Mackerras mfspr r11,SPRN_DAR 97414cf11afSPaul Mackerras srdi r11,r11,28 97514cf11afSPaul Mackerras rldimi r10,r11,7,52 /* r10 = first ste of the group */ 97614cf11afSPaul Mackerras 97714cf11afSPaul Mackerras /* Calculate VSID */ 97814cf11afSPaul Mackerras /* This is a kernel address, so protovsid = ESID */ 9791189be65SPaul Mackerras ASM_VSID_SCRAMBLE(r11, r9, 256M) 98014cf11afSPaul Mackerras rldic r9,r11,12,16 /* r9 = vsid << 12 */ 98114cf11afSPaul Mackerras 98214cf11afSPaul Mackerras /* Search the primary group for a free entry */ 98314cf11afSPaul Mackerras1: ld r11,0(r10) /* Test valid bit of the current ste */ 98414cf11afSPaul Mackerras andi. r11,r11,0x80 98514cf11afSPaul Mackerras beq 2f 98614cf11afSPaul Mackerras addi r10,r10,16 98714cf11afSPaul Mackerras andi. r11,r10,0x70 98814cf11afSPaul Mackerras bne 1b 98914cf11afSPaul Mackerras 99014cf11afSPaul Mackerras /* Stick for only searching the primary group for now. */ 99114cf11afSPaul Mackerras /* At least for now, we use a very simple random castout scheme */ 99214cf11afSPaul Mackerras /* Use the TB as a random number ; OR in 1 to avoid entry 0 */ 99314cf11afSPaul Mackerras mftb r11 99414cf11afSPaul Mackerras rldic r11,r11,4,57 /* r11 = (r11 << 4) & 0x70 */ 99514cf11afSPaul Mackerras ori r11,r11,0x10 99614cf11afSPaul Mackerras 99714cf11afSPaul Mackerras /* r10 currently points to an ste one past the group of interest */ 99814cf11afSPaul Mackerras /* make it point to the randomly selected entry */ 99914cf11afSPaul Mackerras subi r10,r10,128 100014cf11afSPaul Mackerras or r10,r10,r11 /* r10 is the entry to invalidate */ 100114cf11afSPaul Mackerras 100214cf11afSPaul Mackerras isync /* mark the entry invalid */ 100314cf11afSPaul Mackerras ld r11,0(r10) 100414cf11afSPaul Mackerras rldicl r11,r11,56,1 /* clear the valid bit */ 100514cf11afSPaul Mackerras rotldi r11,r11,8 100614cf11afSPaul Mackerras std r11,0(r10) 100714cf11afSPaul Mackerras sync 100814cf11afSPaul Mackerras 100914cf11afSPaul Mackerras clrrdi r11,r11,28 /* Get the esid part of the ste */ 101014cf11afSPaul Mackerras slbie r11 101114cf11afSPaul Mackerras 101214cf11afSPaul Mackerras2: std r9,8(r10) /* Store the vsid part of the ste */ 101314cf11afSPaul Mackerras eieio 101414cf11afSPaul Mackerras 1015b5bbeb23SPaul Mackerras mfspr r11,SPRN_DAR /* Get the new esid */ 101614cf11afSPaul Mackerras clrrdi r11,r11,28 /* Permits a full 32b of ESID */ 101714cf11afSPaul Mackerras ori r11,r11,0x90 /* Turn on valid and kp */ 101814cf11afSPaul Mackerras std r11,0(r10) /* Put new entry back into the stab */ 101914cf11afSPaul Mackerras 102014cf11afSPaul Mackerras sync 102114cf11afSPaul Mackerras 102214cf11afSPaul Mackerras /* All done -- return from exception. */ 102314cf11afSPaul Mackerras lwz r9,PACA_EXSLB+EX_CCR(r13) /* get saved CR */ 102414cf11afSPaul Mackerras ld r11,PACA_EXSLB+EX_SRR0(r13) /* get saved SRR0 */ 102514cf11afSPaul Mackerras 102614cf11afSPaul Mackerras andi. r10,r12,MSR_RI 102714cf11afSPaul Mackerras beq- unrecov_slb 102814cf11afSPaul Mackerras 102914cf11afSPaul Mackerras mtcrf 0x80,r9 /* restore CR */ 103014cf11afSPaul Mackerras 103114cf11afSPaul Mackerras mfmsr r10 103214cf11afSPaul Mackerras clrrdi r10,r10,2 103314cf11afSPaul Mackerras mtmsrd r10,1 103414cf11afSPaul Mackerras 1035b5bbeb23SPaul Mackerras mtspr SPRN_SRR0,r11 1036b5bbeb23SPaul Mackerras mtspr SPRN_SRR1,r12 103714cf11afSPaul Mackerras ld r9,PACA_EXSLB+EX_R9(r13) 103814cf11afSPaul Mackerras ld r10,PACA_EXSLB+EX_R10(r13) 103914cf11afSPaul Mackerras ld r11,PACA_EXSLB+EX_R11(r13) 104014cf11afSPaul Mackerras ld r12,PACA_EXSLB+EX_R12(r13) 104114cf11afSPaul Mackerras ld r13,PACA_EXSLB+EX_R13(r13) 104214cf11afSPaul Mackerras rfid 104314cf11afSPaul Mackerras b . /* prevent speculative execution */ 104414cf11afSPaul Mackerras 104514cf11afSPaul Mackerras/* 104614cf11afSPaul Mackerras * Space for CPU0's segment table. 104714cf11afSPaul Mackerras * 104814cf11afSPaul Mackerras * On iSeries, the hypervisor must fill in at least one entry before 104916a15a30SStephen Rothwell * we get control (with relocate on). The address is given to the hv 105016a15a30SStephen Rothwell * as a page number (see xLparMap below), so this must be at a 105114cf11afSPaul Mackerras * fixed address (the linker can't compute (u64)&initial_stab >> 105214cf11afSPaul Mackerras * PAGE_SHIFT). 105314cf11afSPaul Mackerras */ 1054758438a7SMichael Ellerman . = STAB0_OFFSET /* 0x6000 */ 105514cf11afSPaul Mackerras .globl initial_stab 105614cf11afSPaul Mackerrasinitial_stab: 105714cf11afSPaul Mackerras .space 4096 105814cf11afSPaul Mackerras 10599e4859efSStephen Rothwell#ifdef CONFIG_PPC_PSERIES 106014cf11afSPaul Mackerras/* 106114cf11afSPaul Mackerras * Data area reserved for FWNMI option. 106214cf11afSPaul Mackerras * This address (0x7000) is fixed by the RPA. 106314cf11afSPaul Mackerras */ 106414cf11afSPaul Mackerras .= 0x7000 106514cf11afSPaul Mackerras .globl fwnmi_data_area 106614cf11afSPaul Mackerrasfwnmi_data_area: 10679e4859efSStephen Rothwell#endif /* CONFIG_PPC_PSERIES */ 106814cf11afSPaul Mackerras 106914cf11afSPaul Mackerras /* iSeries does not use the FWNMI stuff, so it is safe to put 107014cf11afSPaul Mackerras * this here, even if we later allow kernels that will boot on 107114cf11afSPaul Mackerras * both pSeries and iSeries */ 107214cf11afSPaul Mackerras#ifdef CONFIG_PPC_ISERIES 107314cf11afSPaul Mackerras . = LPARMAP_PHYS 107416a15a30SStephen Rothwell .globl xLparMap 107516a15a30SStephen RothwellxLparMap: 107616a15a30SStephen Rothwell .quad HvEsidsToMap /* xNumberEsids */ 107716a15a30SStephen Rothwell .quad HvRangesToMap /* xNumberRanges */ 107816a15a30SStephen Rothwell .quad STAB0_PAGE /* xSegmentTableOffs */ 107916a15a30SStephen Rothwell .zero 40 /* xRsvd */ 108016a15a30SStephen Rothwell /* xEsids (HvEsidsToMap entries of 2 quads) */ 108116a15a30SStephen Rothwell .quad PAGE_OFFSET_ESID /* xKernelEsid */ 108216a15a30SStephen Rothwell .quad PAGE_OFFSET_VSID /* xKernelVsid */ 108316a15a30SStephen Rothwell .quad VMALLOC_START_ESID /* xKernelEsid */ 108416a15a30SStephen Rothwell .quad VMALLOC_START_VSID /* xKernelVsid */ 108516a15a30SStephen Rothwell /* xRanges (HvRangesToMap entries of 3 quads) */ 108616a15a30SStephen Rothwell .quad HvPagesToMap /* xPages */ 108716a15a30SStephen Rothwell .quad 0 /* xOffset */ 108816a15a30SStephen Rothwell .quad PAGE_OFFSET_VSID << (SID_SHIFT - HW_PAGE_SHIFT) /* xVPN */ 108916a15a30SStephen Rothwell 109014cf11afSPaul Mackerras#endif /* CONFIG_PPC_ISERIES */ 109114cf11afSPaul Mackerras 10929e4859efSStephen Rothwell#ifdef CONFIG_PPC_PSERIES 109314cf11afSPaul Mackerras . = 0x8000 10949e4859efSStephen Rothwell#endif /* CONFIG_PPC_PSERIES */ 109514cf11afSPaul Mackerras 109614cf11afSPaul Mackerras/* 1097f39b7a55SOlof Johansson * On pSeries and most other platforms, secondary processors spin 1098f39b7a55SOlof Johansson * in the following code. 109914cf11afSPaul Mackerras * At entry, r3 = this processor's number (physical cpu id) 110014cf11afSPaul Mackerras */ 1101f39b7a55SOlof Johansson_GLOBAL(generic_secondary_smp_init) 110214cf11afSPaul Mackerras mr r24,r3 110314cf11afSPaul Mackerras 110414cf11afSPaul Mackerras /* turn on 64-bit mode */ 110514cf11afSPaul Mackerras bl .enable_64b_mode 110614cf11afSPaul Mackerras 110714cf11afSPaul Mackerras /* Set up a paca value for this processor. Since we have the 110814cf11afSPaul Mackerras * physical cpu id in r24, we need to search the pacas to find 110914cf11afSPaul Mackerras * which logical id maps to our physical one. 111014cf11afSPaul Mackerras */ 1111e58c3495SDavid Gibson LOAD_REG_IMMEDIATE(r13, paca) /* Get base vaddr of paca array */ 111214cf11afSPaul Mackerras li r5,0 /* logical cpu id */ 111314cf11afSPaul Mackerras1: lhz r6,PACAHWCPUID(r13) /* Load HW procid from paca */ 111414cf11afSPaul Mackerras cmpw r6,r24 /* Compare to our id */ 111514cf11afSPaul Mackerras beq 2f 111614cf11afSPaul Mackerras addi r13,r13,PACA_SIZE /* Loop to next PACA on miss */ 111714cf11afSPaul Mackerras addi r5,r5,1 111814cf11afSPaul Mackerras cmpwi r5,NR_CPUS 111914cf11afSPaul Mackerras blt 1b 112014cf11afSPaul Mackerras 112114cf11afSPaul Mackerras mr r3,r24 /* not found, copy phys to r3 */ 112214cf11afSPaul Mackerras b .kexec_wait /* next kernel might do better */ 112314cf11afSPaul Mackerras 1124b5bbeb23SPaul Mackerras2: mtspr SPRN_SPRG3,r13 /* Save vaddr of paca in SPRG3 */ 112514cf11afSPaul Mackerras /* From now on, r24 is expected to be logical cpuid */ 112614cf11afSPaul Mackerras mr r24,r5 112714cf11afSPaul Mackerras3: HMT_LOW 112814cf11afSPaul Mackerras lbz r23,PACAPROCSTART(r13) /* Test if this processor should */ 112914cf11afSPaul Mackerras /* start. */ 113014cf11afSPaul Mackerras sync 113114cf11afSPaul Mackerras 1132f39b7a55SOlof Johansson#ifndef CONFIG_SMP 1133f39b7a55SOlof Johansson b 3b /* Never go on non-SMP */ 1134f39b7a55SOlof Johansson#else 1135f39b7a55SOlof Johansson cmpwi 0,r23,0 1136f39b7a55SOlof Johansson beq 3b /* Loop until told to go */ 1137f39b7a55SOlof Johansson 1138f39b7a55SOlof Johansson /* See if we need to call a cpu state restore handler */ 1139f39b7a55SOlof Johansson LOAD_REG_IMMEDIATE(r23, cur_cpu_spec) 1140f39b7a55SOlof Johansson ld r23,0(r23) 1141f39b7a55SOlof Johansson ld r23,CPU_SPEC_RESTORE(r23) 1142f39b7a55SOlof Johansson cmpdi 0,r23,0 1143f39b7a55SOlof Johansson beq 4f 1144f39b7a55SOlof Johansson ld r23,0(r23) 1145f39b7a55SOlof Johansson mtctr r23 1146f39b7a55SOlof Johansson bctrl 1147f39b7a55SOlof Johansson 1148f39b7a55SOlof Johansson4: /* Create a temp kernel stack for use before relocation is on. */ 114914cf11afSPaul Mackerras ld r1,PACAEMERGSP(r13) 115014cf11afSPaul Mackerras subi r1,r1,STACK_FRAME_OVERHEAD 115114cf11afSPaul Mackerras 1152c705677eSStephen Rothwell b __secondary_start 115314cf11afSPaul Mackerras#endif 115414cf11afSPaul Mackerras 115514cf11afSPaul Mackerras_STATIC(__mmu_off) 115614cf11afSPaul Mackerras mfmsr r3 115714cf11afSPaul Mackerras andi. r0,r3,MSR_IR|MSR_DR 115814cf11afSPaul Mackerras beqlr 115914cf11afSPaul Mackerras andc r3,r3,r0 116014cf11afSPaul Mackerras mtspr SPRN_SRR0,r4 116114cf11afSPaul Mackerras mtspr SPRN_SRR1,r3 116214cf11afSPaul Mackerras sync 116314cf11afSPaul Mackerras rfid 116414cf11afSPaul Mackerras b . /* prevent speculative execution */ 116514cf11afSPaul Mackerras 116614cf11afSPaul Mackerras 116714cf11afSPaul Mackerras/* 116814cf11afSPaul Mackerras * Here is our main kernel entry point. We support currently 2 kind of entries 116914cf11afSPaul Mackerras * depending on the value of r5. 117014cf11afSPaul Mackerras * 117114cf11afSPaul Mackerras * r5 != NULL -> OF entry, we go to prom_init, "legacy" parameter content 117214cf11afSPaul Mackerras * in r3...r7 117314cf11afSPaul Mackerras * 117414cf11afSPaul Mackerras * r5 == NULL -> kexec style entry. r3 is a physical pointer to the 117514cf11afSPaul Mackerras * DT block, r4 is a physical pointer to the kernel itself 117614cf11afSPaul Mackerras * 117714cf11afSPaul Mackerras */ 117814cf11afSPaul Mackerras_GLOBAL(__start_initialization_multiplatform) 117914cf11afSPaul Mackerras /* 118014cf11afSPaul Mackerras * Are we booted from a PROM Of-type client-interface ? 118114cf11afSPaul Mackerras */ 118214cf11afSPaul Mackerras cmpldi cr0,r5,0 1183939e60f6SStephen Rothwell beq 1f 1184939e60f6SStephen Rothwell b .__boot_from_prom /* yes -> prom */ 1185939e60f6SStephen Rothwell1: 118614cf11afSPaul Mackerras /* Save parameters */ 118714cf11afSPaul Mackerras mr r31,r3 118814cf11afSPaul Mackerras mr r30,r4 118914cf11afSPaul Mackerras 119014cf11afSPaul Mackerras /* Make sure we are running in 64 bits mode */ 119114cf11afSPaul Mackerras bl .enable_64b_mode 119214cf11afSPaul Mackerras 119314cf11afSPaul Mackerras /* Setup some critical 970 SPRs before switching MMU off */ 1194f39b7a55SOlof Johansson mfspr r0,SPRN_PVR 1195f39b7a55SOlof Johansson srwi r0,r0,16 1196f39b7a55SOlof Johansson cmpwi r0,0x39 /* 970 */ 1197f39b7a55SOlof Johansson beq 1f 1198f39b7a55SOlof Johansson cmpwi r0,0x3c /* 970FX */ 1199f39b7a55SOlof Johansson beq 1f 1200f39b7a55SOlof Johansson cmpwi r0,0x44 /* 970MP */ 1201190a24f5SOlof Johansson beq 1f 1202190a24f5SOlof Johansson cmpwi r0,0x45 /* 970GX */ 1203f39b7a55SOlof Johansson bne 2f 1204f39b7a55SOlof Johansson1: bl .__cpu_preinit_ppc970 1205f39b7a55SOlof Johansson2: 120614cf11afSPaul Mackerras 120714cf11afSPaul Mackerras /* Switch off MMU if not already */ 1208e58c3495SDavid Gibson LOAD_REG_IMMEDIATE(r4, .__after_prom_start - KERNELBASE) 120914cf11afSPaul Mackerras add r4,r4,r30 121014cf11afSPaul Mackerras bl .__mmu_off 121114cf11afSPaul Mackerras b .__after_prom_start 121214cf11afSPaul Mackerras 1213939e60f6SStephen Rothwell_INIT_STATIC(__boot_from_prom) 121414cf11afSPaul Mackerras /* Save parameters */ 121514cf11afSPaul Mackerras mr r31,r3 121614cf11afSPaul Mackerras mr r30,r4 121714cf11afSPaul Mackerras mr r29,r5 121814cf11afSPaul Mackerras mr r28,r6 121914cf11afSPaul Mackerras mr r27,r7 122014cf11afSPaul Mackerras 12216088857bSOlaf Hering /* 12226088857bSOlaf Hering * Align the stack to 16-byte boundary 12236088857bSOlaf Hering * Depending on the size and layout of the ELF sections in the initial 12246088857bSOlaf Hering * boot binary, the stack pointer will be unalignet on PowerMac 12256088857bSOlaf Hering */ 1226c05b4770SLinus Torvalds rldicr r1,r1,0,59 1227c05b4770SLinus Torvalds 122814cf11afSPaul Mackerras /* Make sure we are running in 64 bits mode */ 122914cf11afSPaul Mackerras bl .enable_64b_mode 123014cf11afSPaul Mackerras 123114cf11afSPaul Mackerras /* put a relocation offset into r3 */ 123214cf11afSPaul Mackerras bl .reloc_offset 123314cf11afSPaul Mackerras 1234e58c3495SDavid Gibson LOAD_REG_IMMEDIATE(r2,__toc_start) 123514cf11afSPaul Mackerras addi r2,r2,0x4000 123614cf11afSPaul Mackerras addi r2,r2,0x4000 123714cf11afSPaul Mackerras 123814cf11afSPaul Mackerras /* Relocate the TOC from a virt addr to a real addr */ 12395a408329SPaul Mackerras add r2,r2,r3 124014cf11afSPaul Mackerras 124114cf11afSPaul Mackerras /* Restore parameters */ 124214cf11afSPaul Mackerras mr r3,r31 124314cf11afSPaul Mackerras mr r4,r30 124414cf11afSPaul Mackerras mr r5,r29 124514cf11afSPaul Mackerras mr r6,r28 124614cf11afSPaul Mackerras mr r7,r27 124714cf11afSPaul Mackerras 124814cf11afSPaul Mackerras /* Do all of the interaction with OF client interface */ 124914cf11afSPaul Mackerras bl .prom_init 125014cf11afSPaul Mackerras /* We never return */ 125114cf11afSPaul Mackerras trap 125214cf11afSPaul Mackerras 125314cf11afSPaul Mackerras_STATIC(__after_prom_start) 125414cf11afSPaul Mackerras 125514cf11afSPaul Mackerras/* 1256758438a7SMichael Ellerman * We need to run with __start at physical address PHYSICAL_START. 125714cf11afSPaul Mackerras * This will leave some code in the first 256B of 125814cf11afSPaul Mackerras * real memory, which are reserved for software use. 125914cf11afSPaul Mackerras * The remainder of the first page is loaded with the fixed 126014cf11afSPaul Mackerras * interrupt vectors. The next two pages are filled with 126114cf11afSPaul Mackerras * unknown exception placeholders. 126214cf11afSPaul Mackerras * 126314cf11afSPaul Mackerras * Note: This process overwrites the OF exception vectors. 126414cf11afSPaul Mackerras * r26 == relocation offset 126514cf11afSPaul Mackerras * r27 == KERNELBASE 126614cf11afSPaul Mackerras */ 126714cf11afSPaul Mackerras bl .reloc_offset 126814cf11afSPaul Mackerras mr r26,r3 1269e58c3495SDavid Gibson LOAD_REG_IMMEDIATE(r27, KERNELBASE) 127014cf11afSPaul Mackerras 1271e58c3495SDavid Gibson LOAD_REG_IMMEDIATE(r3, PHYSICAL_START) /* target addr */ 127214cf11afSPaul Mackerras 127314cf11afSPaul Mackerras // XXX FIXME: Use phys returned by OF (r30) 12745a408329SPaul Mackerras add r4,r27,r26 /* source addr */ 127514cf11afSPaul Mackerras /* current address of _start */ 127614cf11afSPaul Mackerras /* i.e. where we are running */ 127714cf11afSPaul Mackerras /* the source addr */ 127814cf11afSPaul Mackerras 1279d0b79c54SJimi Xenidis cmpdi r4,0 /* In some cases the loader may */ 1280939e60f6SStephen Rothwell bne 1f 1281939e60f6SStephen Rothwell b .start_here_multiplatform /* have already put us at zero */ 1282d0b79c54SJimi Xenidis /* so we can skip the copy. */ 1283939e60f6SStephen Rothwell1: LOAD_REG_IMMEDIATE(r5,copy_to_here) /* # bytes of memory to copy */ 128414cf11afSPaul Mackerras sub r5,r5,r27 128514cf11afSPaul Mackerras 128614cf11afSPaul Mackerras li r6,0x100 /* Start offset, the first 0x100 */ 128714cf11afSPaul Mackerras /* bytes were copied earlier. */ 128814cf11afSPaul Mackerras 128914cf11afSPaul Mackerras bl .copy_and_flush /* copy the first n bytes */ 129014cf11afSPaul Mackerras /* this includes the code being */ 129114cf11afSPaul Mackerras /* executed here. */ 129214cf11afSPaul Mackerras 1293e58c3495SDavid Gibson LOAD_REG_IMMEDIATE(r0, 4f) /* Jump to the copy of this code */ 129414cf11afSPaul Mackerras mtctr r0 /* that we just made/relocated */ 129514cf11afSPaul Mackerras bctr 129614cf11afSPaul Mackerras 1297e58c3495SDavid Gibson4: LOAD_REG_IMMEDIATE(r5,klimit) 12985a408329SPaul Mackerras add r5,r5,r26 129914cf11afSPaul Mackerras ld r5,0(r5) /* get the value of klimit */ 130014cf11afSPaul Mackerras sub r5,r5,r27 130114cf11afSPaul Mackerras bl .copy_and_flush /* copy the rest */ 130214cf11afSPaul Mackerras b .start_here_multiplatform 130314cf11afSPaul Mackerras 130414cf11afSPaul Mackerras/* 130514cf11afSPaul Mackerras * Copy routine used to copy the kernel to start at physical address 0 130614cf11afSPaul Mackerras * and flush and invalidate the caches as needed. 130714cf11afSPaul Mackerras * r3 = dest addr, r4 = source addr, r5 = copy limit, r6 = start offset 130814cf11afSPaul Mackerras * on exit, r3, r4, r5 are unchanged, r6 is updated to be >= r5. 130914cf11afSPaul Mackerras * 131014cf11afSPaul Mackerras * Note: this routine *only* clobbers r0, r6 and lr 131114cf11afSPaul Mackerras */ 131214cf11afSPaul Mackerras_GLOBAL(copy_and_flush) 131314cf11afSPaul Mackerras addi r5,r5,-8 131414cf11afSPaul Mackerras addi r6,r6,-8 13155a2fe38dSOlof Johansson4: li r0,8 /* Use the smallest common */ 131614cf11afSPaul Mackerras /* denominator cache line */ 131714cf11afSPaul Mackerras /* size. This results in */ 131814cf11afSPaul Mackerras /* extra cache line flushes */ 131914cf11afSPaul Mackerras /* but operation is correct. */ 132014cf11afSPaul Mackerras /* Can't get cache line size */ 132114cf11afSPaul Mackerras /* from NACA as it is being */ 132214cf11afSPaul Mackerras /* moved too. */ 132314cf11afSPaul Mackerras 132414cf11afSPaul Mackerras mtctr r0 /* put # words/line in ctr */ 132514cf11afSPaul Mackerras3: addi r6,r6,8 /* copy a cache line */ 132614cf11afSPaul Mackerras ldx r0,r6,r4 132714cf11afSPaul Mackerras stdx r0,r6,r3 132814cf11afSPaul Mackerras bdnz 3b 132914cf11afSPaul Mackerras dcbst r6,r3 /* write it to memory */ 133014cf11afSPaul Mackerras sync 133114cf11afSPaul Mackerras icbi r6,r3 /* flush the icache line */ 133214cf11afSPaul Mackerras cmpld 0,r6,r5 133314cf11afSPaul Mackerras blt 4b 133414cf11afSPaul Mackerras sync 133514cf11afSPaul Mackerras addi r5,r5,8 133614cf11afSPaul Mackerras addi r6,r6,8 133714cf11afSPaul Mackerras blr 133814cf11afSPaul Mackerras 133914cf11afSPaul Mackerras.align 8 134014cf11afSPaul Mackerrascopy_to_here: 134114cf11afSPaul Mackerras 134214cf11afSPaul Mackerras#ifdef CONFIG_SMP 134314cf11afSPaul Mackerras#ifdef CONFIG_PPC_PMAC 134414cf11afSPaul Mackerras/* 134514cf11afSPaul Mackerras * On PowerMac, secondary processors starts from the reset vector, which 134614cf11afSPaul Mackerras * is temporarily turned into a call to one of the functions below. 134714cf11afSPaul Mackerras */ 134814cf11afSPaul Mackerras .section ".text"; 134914cf11afSPaul Mackerras .align 2 ; 135014cf11afSPaul Mackerras 135135499c01SPaul Mackerras .globl __secondary_start_pmac_0 135235499c01SPaul Mackerras__secondary_start_pmac_0: 135335499c01SPaul Mackerras /* NB the entries for cpus 0, 1, 2 must each occupy 8 bytes. */ 135435499c01SPaul Mackerras li r24,0 135535499c01SPaul Mackerras b 1f 135614cf11afSPaul Mackerras li r24,1 135735499c01SPaul Mackerras b 1f 135814cf11afSPaul Mackerras li r24,2 135935499c01SPaul Mackerras b 1f 136014cf11afSPaul Mackerras li r24,3 136135499c01SPaul Mackerras1: 136214cf11afSPaul Mackerras 136314cf11afSPaul Mackerras_GLOBAL(pmac_secondary_start) 136414cf11afSPaul Mackerras /* turn on 64-bit mode */ 136514cf11afSPaul Mackerras bl .enable_64b_mode 136614cf11afSPaul Mackerras 136714cf11afSPaul Mackerras /* Copy some CPU settings from CPU 0 */ 1368f39b7a55SOlof Johansson bl .__restore_cpu_ppc970 136914cf11afSPaul Mackerras 137014cf11afSPaul Mackerras /* pSeries do that early though I don't think we really need it */ 137114cf11afSPaul Mackerras mfmsr r3 137214cf11afSPaul Mackerras ori r3,r3,MSR_RI 137314cf11afSPaul Mackerras mtmsrd r3 /* RI on */ 137414cf11afSPaul Mackerras 137514cf11afSPaul Mackerras /* Set up a paca value for this processor. */ 1376e58c3495SDavid Gibson LOAD_REG_IMMEDIATE(r4, paca) /* Get base vaddr of paca array */ 137714cf11afSPaul Mackerras mulli r13,r24,PACA_SIZE /* Calculate vaddr of right paca */ 137814cf11afSPaul Mackerras add r13,r13,r4 /* for this processor. */ 1379b5bbeb23SPaul Mackerras mtspr SPRN_SPRG3,r13 /* Save vaddr of paca in SPRG3 */ 138014cf11afSPaul Mackerras 138114cf11afSPaul Mackerras /* Create a temp kernel stack for use before relocation is on. */ 138214cf11afSPaul Mackerras ld r1,PACAEMERGSP(r13) 138314cf11afSPaul Mackerras subi r1,r1,STACK_FRAME_OVERHEAD 138414cf11afSPaul Mackerras 1385c705677eSStephen Rothwell b __secondary_start 138614cf11afSPaul Mackerras 138714cf11afSPaul Mackerras#endif /* CONFIG_PPC_PMAC */ 138814cf11afSPaul Mackerras 138914cf11afSPaul Mackerras/* 139014cf11afSPaul Mackerras * This function is called after the master CPU has released the 139114cf11afSPaul Mackerras * secondary processors. The execution environment is relocation off. 139214cf11afSPaul Mackerras * The paca for this processor has the following fields initialized at 139314cf11afSPaul Mackerras * this point: 139414cf11afSPaul Mackerras * 1. Processor number 139514cf11afSPaul Mackerras * 2. Segment table pointer (virtual address) 139614cf11afSPaul Mackerras * On entry the following are set: 139714cf11afSPaul Mackerras * r1 = stack pointer. vaddr for iSeries, raddr (temp stack) for pSeries 139814cf11afSPaul Mackerras * r24 = cpu# (in Linux terms) 139914cf11afSPaul Mackerras * r13 = paca virtual address 140014cf11afSPaul Mackerras * SPRG3 = paca virtual address 140114cf11afSPaul Mackerras */ 1402fc68e869SStephen Rothwell .globl __secondary_start 1403c705677eSStephen Rothwell__secondary_start: 1404799d6046SPaul Mackerras /* Set thread priority to MEDIUM */ 1405799d6046SPaul Mackerras HMT_MEDIUM 140614cf11afSPaul Mackerras 1407799d6046SPaul Mackerras /* Load TOC */ 140814cf11afSPaul Mackerras ld r2,PACATOC(r13) 140914cf11afSPaul Mackerras 1410799d6046SPaul Mackerras /* Do early setup for that CPU (stab, slb, hash table pointer) */ 1411799d6046SPaul Mackerras bl .early_setup_secondary 141214cf11afSPaul Mackerras 141314cf11afSPaul Mackerras /* Initialize the kernel stack. Just a repeat for iSeries. */ 1414e58c3495SDavid Gibson LOAD_REG_ADDR(r3, current_set) 141514cf11afSPaul Mackerras sldi r28,r24,3 /* get current_set[cpu#] */ 141614cf11afSPaul Mackerras ldx r1,r3,r28 141714cf11afSPaul Mackerras addi r1,r1,THREAD_SIZE-STACK_FRAME_OVERHEAD 141814cf11afSPaul Mackerras std r1,PACAKSAVE(r13) 141914cf11afSPaul Mackerras 1420799d6046SPaul Mackerras /* Clear backchain so we get nice backtraces */ 142114cf11afSPaul Mackerras li r7,0 142214cf11afSPaul Mackerras mtlr r7 142314cf11afSPaul Mackerras 142414cf11afSPaul Mackerras /* enable MMU and jump to start_secondary */ 1425e58c3495SDavid Gibson LOAD_REG_ADDR(r3, .start_secondary_prolog) 1426e58c3495SDavid Gibson LOAD_REG_IMMEDIATE(r4, MSR_KERNEL) 1427d04c56f7SPaul Mackerras#ifdef CONFIG_PPC_ISERIES 14283f639ee8SStephen RothwellBEGIN_FW_FTR_SECTION 142914cf11afSPaul Mackerras ori r4,r4,MSR_EE 1430ff3da2e0SBenjamin Herrenschmidt li r8,1 1431ff3da2e0SBenjamin Herrenschmidt stb r8,PACAHARDIRQEN(r13) 14323f639ee8SStephen RothwellEND_FW_FTR_SECTION_IFSET(FW_FEATURE_ISERIES) 143314cf11afSPaul Mackerras#endif 1434d04c56f7SPaul MackerrasBEGIN_FW_FTR_SECTION 1435d04c56f7SPaul Mackerras stb r7,PACAHARDIRQEN(r13) 1436d04c56f7SPaul MackerrasEND_FW_FTR_SECTION_IFCLR(FW_FEATURE_ISERIES) 1437ff3da2e0SBenjamin Herrenschmidt stb r7,PACASOFTIRQEN(r13) 1438d04c56f7SPaul Mackerras 1439b5bbeb23SPaul Mackerras mtspr SPRN_SRR0,r3 1440b5bbeb23SPaul Mackerras mtspr SPRN_SRR1,r4 144114cf11afSPaul Mackerras rfid 144214cf11afSPaul Mackerras b . /* prevent speculative execution */ 144314cf11afSPaul Mackerras 144414cf11afSPaul Mackerras/* 144514cf11afSPaul Mackerras * Running with relocation on at this point. All we want to do is 144614cf11afSPaul Mackerras * zero the stack back-chain pointer before going into C code. 144714cf11afSPaul Mackerras */ 144814cf11afSPaul Mackerras_GLOBAL(start_secondary_prolog) 144914cf11afSPaul Mackerras li r3,0 145014cf11afSPaul Mackerras std r3,0(r1) /* Zero the stack frame pointer */ 145114cf11afSPaul Mackerras bl .start_secondary 1452799d6046SPaul Mackerras b . 145314cf11afSPaul Mackerras#endif 145414cf11afSPaul Mackerras 145514cf11afSPaul Mackerras/* 145614cf11afSPaul Mackerras * This subroutine clobbers r11 and r12 145714cf11afSPaul Mackerras */ 145814cf11afSPaul Mackerras_GLOBAL(enable_64b_mode) 145914cf11afSPaul Mackerras mfmsr r11 /* grab the current MSR */ 146014cf11afSPaul Mackerras li r12,1 146114cf11afSPaul Mackerras rldicr r12,r12,MSR_SF_LG,(63-MSR_SF_LG) 146214cf11afSPaul Mackerras or r11,r11,r12 146314cf11afSPaul Mackerras li r12,1 146414cf11afSPaul Mackerras rldicr r12,r12,MSR_ISF_LG,(63-MSR_ISF_LG) 146514cf11afSPaul Mackerras or r11,r11,r12 146614cf11afSPaul Mackerras mtmsrd r11 146714cf11afSPaul Mackerras isync 146814cf11afSPaul Mackerras blr 146914cf11afSPaul Mackerras 147014cf11afSPaul Mackerras/* 147114cf11afSPaul Mackerras * This is where the main kernel code starts. 147214cf11afSPaul Mackerras */ 1473939e60f6SStephen Rothwell_INIT_STATIC(start_here_multiplatform) 147414cf11afSPaul Mackerras /* get a new offset, now that the kernel has moved. */ 147514cf11afSPaul Mackerras bl .reloc_offset 147614cf11afSPaul Mackerras mr r26,r3 147714cf11afSPaul Mackerras 147814cf11afSPaul Mackerras /* Clear out the BSS. It may have been done in prom_init, 147914cf11afSPaul Mackerras * already but that's irrelevant since prom_init will soon 148014cf11afSPaul Mackerras * be detached from the kernel completely. Besides, we need 148114cf11afSPaul Mackerras * to clear it now for kexec-style entry. 148214cf11afSPaul Mackerras */ 1483e58c3495SDavid Gibson LOAD_REG_IMMEDIATE(r11,__bss_stop) 1484e58c3495SDavid Gibson LOAD_REG_IMMEDIATE(r8,__bss_start) 148514cf11afSPaul Mackerras sub r11,r11,r8 /* bss size */ 148614cf11afSPaul Mackerras addi r11,r11,7 /* round up to an even double word */ 148714cf11afSPaul Mackerras rldicl. r11,r11,61,3 /* shift right by 3 */ 148814cf11afSPaul Mackerras beq 4f 148914cf11afSPaul Mackerras addi r8,r8,-8 149014cf11afSPaul Mackerras li r0,0 149114cf11afSPaul Mackerras mtctr r11 /* zero this many doublewords */ 149214cf11afSPaul Mackerras3: stdu r0,8(r8) 149314cf11afSPaul Mackerras bdnz 3b 149414cf11afSPaul Mackerras4: 149514cf11afSPaul Mackerras 149614cf11afSPaul Mackerras mfmsr r6 149714cf11afSPaul Mackerras ori r6,r6,MSR_RI 149814cf11afSPaul Mackerras mtmsrd r6 /* RI on */ 149914cf11afSPaul Mackerras 150014cf11afSPaul Mackerras /* The following gets the stack and TOC set up with the regs */ 150114cf11afSPaul Mackerras /* pointing to the real addr of the kernel stack. This is */ 150214cf11afSPaul Mackerras /* all done to support the C function call below which sets */ 150314cf11afSPaul Mackerras /* up the htab. This is done because we have relocated the */ 150414cf11afSPaul Mackerras /* kernel but are still running in real mode. */ 150514cf11afSPaul Mackerras 1506e58c3495SDavid Gibson LOAD_REG_IMMEDIATE(r3,init_thread_union) 15075a408329SPaul Mackerras add r3,r3,r26 150814cf11afSPaul Mackerras 150914cf11afSPaul Mackerras /* set up a stack pointer (physical address) */ 151014cf11afSPaul Mackerras addi r1,r3,THREAD_SIZE 151114cf11afSPaul Mackerras li r0,0 151214cf11afSPaul Mackerras stdu r0,-STACK_FRAME_OVERHEAD(r1) 151314cf11afSPaul Mackerras 151414cf11afSPaul Mackerras /* set up the TOC (physical address) */ 1515e58c3495SDavid Gibson LOAD_REG_IMMEDIATE(r2,__toc_start) 151614cf11afSPaul Mackerras addi r2,r2,0x4000 151714cf11afSPaul Mackerras addi r2,r2,0x4000 15185a408329SPaul Mackerras add r2,r2,r26 151914cf11afSPaul Mackerras 1520945feb17SBenjamin Herrenschmidt /* Set initial ptr to current */ 1521945feb17SBenjamin Herrenschmidt LOAD_REG_IMMEDIATE(r4, init_task) 1522945feb17SBenjamin Herrenschmidt std r4,PACACURRENT(r13) 1523945feb17SBenjamin Herrenschmidt 152414cf11afSPaul Mackerras /* Do very early kernel initializations, including initial hash table, 152514cf11afSPaul Mackerras * stab and slb setup before we turn on relocation. */ 152614cf11afSPaul Mackerras 152714cf11afSPaul Mackerras /* Restore parameters passed from prom_init/kexec */ 152814cf11afSPaul Mackerras mr r3,r31 152914cf11afSPaul Mackerras bl .early_setup 153014cf11afSPaul Mackerras 1531e58c3495SDavid Gibson LOAD_REG_IMMEDIATE(r3, .start_here_common) 1532e58c3495SDavid Gibson LOAD_REG_IMMEDIATE(r4, MSR_KERNEL) 1533b5bbeb23SPaul Mackerras mtspr SPRN_SRR0,r3 1534b5bbeb23SPaul Mackerras mtspr SPRN_SRR1,r4 153514cf11afSPaul Mackerras rfid 153614cf11afSPaul Mackerras b . /* prevent speculative execution */ 153714cf11afSPaul Mackerras 153814cf11afSPaul Mackerras /* This is where all platforms converge execution */ 1539fc68e869SStephen Rothwell_INIT_GLOBAL(start_here_common) 154014cf11afSPaul Mackerras /* relocation is on at this point */ 154114cf11afSPaul Mackerras 154214cf11afSPaul Mackerras /* The following code sets up the SP and TOC now that we are */ 154314cf11afSPaul Mackerras /* running with translation enabled. */ 154414cf11afSPaul Mackerras 1545e58c3495SDavid Gibson LOAD_REG_IMMEDIATE(r3,init_thread_union) 154614cf11afSPaul Mackerras 154714cf11afSPaul Mackerras /* set up the stack */ 154814cf11afSPaul Mackerras addi r1,r3,THREAD_SIZE 154914cf11afSPaul Mackerras li r0,0 155014cf11afSPaul Mackerras stdu r0,-STACK_FRAME_OVERHEAD(r1) 155114cf11afSPaul Mackerras 155214cf11afSPaul Mackerras /* Load the TOC */ 155314cf11afSPaul Mackerras ld r2,PACATOC(r13) 155414cf11afSPaul Mackerras std r1,PACAKSAVE(r13) 155514cf11afSPaul Mackerras 155614cf11afSPaul Mackerras bl .setup_system 155714cf11afSPaul Mackerras 155814cf11afSPaul Mackerras /* Load up the kernel context */ 155914cf11afSPaul Mackerras5: 156014cf11afSPaul Mackerras li r5,0 1561d04c56f7SPaul Mackerras stb r5,PACASOFTIRQEN(r13) /* Soft Disabled */ 1562d04c56f7SPaul Mackerras#ifdef CONFIG_PPC_ISERIES 1563d04c56f7SPaul MackerrasBEGIN_FW_FTR_SECTION 156414cf11afSPaul Mackerras mfmsr r5 1565ff3da2e0SBenjamin Herrenschmidt ori r5,r5,MSR_EE /* Hard Enabled on iSeries*/ 156614cf11afSPaul Mackerras mtmsrd r5 1567ff3da2e0SBenjamin Herrenschmidt li r5,1 15683f639ee8SStephen RothwellEND_FW_FTR_SECTION_IFSET(FW_FEATURE_ISERIES) 156914cf11afSPaul Mackerras#endif 1570ff3da2e0SBenjamin Herrenschmidt stb r5,PACAHARDIRQEN(r13) /* Hard Disabled on others */ 157114cf11afSPaul Mackerras 157214cf11afSPaul Mackerras bl .start_kernel 157314cf11afSPaul Mackerras 1574f1870f77SAnton Blanchard /* Not reached */ 1575f1870f77SAnton Blanchard BUG_OPCODE 157614cf11afSPaul Mackerras 157714cf11afSPaul Mackerras/* 157814cf11afSPaul Mackerras * We put a few things here that have to be page-aligned. 157914cf11afSPaul Mackerras * This stuff goes at the beginning of the bss, which is page-aligned. 158014cf11afSPaul Mackerras */ 158114cf11afSPaul Mackerras .section ".bss" 158214cf11afSPaul Mackerras 158314cf11afSPaul Mackerras .align PAGE_SHIFT 158414cf11afSPaul Mackerras 158514cf11afSPaul Mackerras .globl empty_zero_page 158614cf11afSPaul Mackerrasempty_zero_page: 158714cf11afSPaul Mackerras .space PAGE_SIZE 158814cf11afSPaul Mackerras 158914cf11afSPaul Mackerras .globl swapper_pg_dir 159014cf11afSPaul Mackerrasswapper_pg_dir: 1591ee7a76daSStephen Rothwell .space PGD_TABLE_SIZE 1592