18aa34ab8SBenjamin Herrenschmidt #ifndef _ASM_POWERPC_EXCEPTION_H 28aa34ab8SBenjamin Herrenschmidt #define _ASM_POWERPC_EXCEPTION_H 38aa34ab8SBenjamin Herrenschmidt /* 48aa34ab8SBenjamin Herrenschmidt * Extracted from head_64.S 58aa34ab8SBenjamin Herrenschmidt * 68aa34ab8SBenjamin Herrenschmidt * PowerPC version 78aa34ab8SBenjamin Herrenschmidt * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) 88aa34ab8SBenjamin Herrenschmidt * 98aa34ab8SBenjamin Herrenschmidt * Rewritten by Cort Dougan (cort@cs.nmt.edu) for PReP 108aa34ab8SBenjamin Herrenschmidt * Copyright (C) 1996 Cort Dougan <cort@cs.nmt.edu> 118aa34ab8SBenjamin Herrenschmidt * Adapted for Power Macintosh by Paul Mackerras. 128aa34ab8SBenjamin Herrenschmidt * Low-level exception handlers and MMU support 138aa34ab8SBenjamin Herrenschmidt * rewritten by Paul Mackerras. 148aa34ab8SBenjamin Herrenschmidt * Copyright (C) 1996 Paul Mackerras. 158aa34ab8SBenjamin Herrenschmidt * 168aa34ab8SBenjamin Herrenschmidt * Adapted for 64bit PowerPC by Dave Engebretsen, Peter Bergner, and 178aa34ab8SBenjamin Herrenschmidt * Mike Corrigan {engebret|bergner|mikejc}@us.ibm.com 188aa34ab8SBenjamin Herrenschmidt * 198aa34ab8SBenjamin Herrenschmidt * This file contains the low-level support and setup for the 208aa34ab8SBenjamin Herrenschmidt * PowerPC-64 platform, including trap and interrupt dispatch. 218aa34ab8SBenjamin Herrenschmidt * 228aa34ab8SBenjamin Herrenschmidt * This program is free software; you can redistribute it and/or 238aa34ab8SBenjamin Herrenschmidt * modify it under the terms of the GNU General Public License 248aa34ab8SBenjamin Herrenschmidt * as published by the Free Software Foundation; either version 258aa34ab8SBenjamin Herrenschmidt * 2 of the License, or (at your option) any later version. 268aa34ab8SBenjamin Herrenschmidt */ 278aa34ab8SBenjamin Herrenschmidt /* 288aa34ab8SBenjamin Herrenschmidt * The following macros define the code that appears as 298aa34ab8SBenjamin Herrenschmidt * the prologue to each of the exception handlers. They 308aa34ab8SBenjamin Herrenschmidt * are split into two parts to allow a single kernel binary 318aa34ab8SBenjamin Herrenschmidt * to be used for pSeries and iSeries. 328aa34ab8SBenjamin Herrenschmidt * 338aa34ab8SBenjamin Herrenschmidt * We make as much of the exception code common between native 348aa34ab8SBenjamin Herrenschmidt * exception handlers (including pSeries LPAR) and iSeries LPAR 358aa34ab8SBenjamin Herrenschmidt * implementations as possible. 368aa34ab8SBenjamin Herrenschmidt */ 378aa34ab8SBenjamin Herrenschmidt 388aa34ab8SBenjamin Herrenschmidt #define EX_R9 0 398aa34ab8SBenjamin Herrenschmidt #define EX_R10 8 408aa34ab8SBenjamin Herrenschmidt #define EX_R11 16 418aa34ab8SBenjamin Herrenschmidt #define EX_R12 24 428aa34ab8SBenjamin Herrenschmidt #define EX_R13 32 438aa34ab8SBenjamin Herrenschmidt #define EX_SRR0 40 448aa34ab8SBenjamin Herrenschmidt #define EX_DAR 48 458aa34ab8SBenjamin Herrenschmidt #define EX_DSISR 56 468aa34ab8SBenjamin Herrenschmidt #define EX_CCR 60 478aa34ab8SBenjamin Herrenschmidt #define EX_R3 64 488aa34ab8SBenjamin Herrenschmidt #define EX_LR 72 4948404f2eSPaul Mackerras #define EX_CFAR 80 50a09688cdSHaren Myneni #define EX_PPR 88 /* SMT thread status register (priority) */ 51bc2e6c6aSMichael Neuling #define EX_CTR 96 528aa34ab8SBenjamin Herrenschmidt 534700dfafSMichael Neuling #ifdef CONFIG_RELOCATABLE 541707dd16SPaul Mackerras #define __EXCEPTION_RELON_PROLOG_PSERIES_1(label, h) \ 554700dfafSMichael Neuling ld r12,PACAKBASE(r13); /* get high part of &label */ \ 564700dfafSMichael Neuling mfspr r11,SPRN_##h##SRR0; /* save SRR0 */ \ 574700dfafSMichael Neuling LOAD_HANDLER(r12,label); \ 58bc2e6c6aSMichael Neuling mtctr r12; \ 594700dfafSMichael Neuling mfspr r12,SPRN_##h##SRR1; /* and SRR1 */ \ 604700dfafSMichael Neuling li r10,MSR_RI; \ 614700dfafSMichael Neuling mtmsrd r10,1; /* Set RI (EE=0) */ \ 62bc2e6c6aSMichael Neuling bctr; 634700dfafSMichael Neuling #else 644700dfafSMichael Neuling /* If not relocatable, we can jump directly -- and save messing with LR */ 651707dd16SPaul Mackerras #define __EXCEPTION_RELON_PROLOG_PSERIES_1(label, h) \ 664700dfafSMichael Neuling mfspr r11,SPRN_##h##SRR0; /* save SRR0 */ \ 674700dfafSMichael Neuling mfspr r12,SPRN_##h##SRR1; /* and SRR1 */ \ 684700dfafSMichael Neuling li r10,MSR_RI; \ 694700dfafSMichael Neuling mtmsrd r10,1; /* Set RI (EE=0) */ \ 704700dfafSMichael Neuling b label; 714700dfafSMichael Neuling #endif 721707dd16SPaul Mackerras #define EXCEPTION_RELON_PROLOG_PSERIES_1(label, h) \ 731707dd16SPaul Mackerras __EXCEPTION_RELON_PROLOG_PSERIES_1(label, h) \ 744700dfafSMichael Neuling 754700dfafSMichael Neuling /* 764700dfafSMichael Neuling * As EXCEPTION_PROLOG_PSERIES(), except we've already got relocation on 774700dfafSMichael Neuling * so no need to rfid. Save lr in case we're CONFIG_RELOCATABLE, in which 784700dfafSMichael Neuling * case EXCEPTION_RELON_PROLOG_PSERIES_1 will be using lr. 794700dfafSMichael Neuling */ 804700dfafSMichael Neuling #define EXCEPTION_RELON_PROLOG_PSERIES(area, label, h, extra, vec) \ 811707dd16SPaul Mackerras EXCEPTION_PROLOG_0(area); \ 824700dfafSMichael Neuling EXCEPTION_PROLOG_1(area, extra, vec); \ 834700dfafSMichael Neuling EXCEPTION_RELON_PROLOG_PSERIES_1(label, h) 844700dfafSMichael Neuling 858aa34ab8SBenjamin Herrenschmidt /* 868aa34ab8SBenjamin Herrenschmidt * We're short on space and time in the exception prolog, so we can't 878aa34ab8SBenjamin Herrenschmidt * use the normal SET_REG_IMMEDIATE macro. Normally we just need the 888aa34ab8SBenjamin Herrenschmidt * low halfword of the address, but for Kdump we need the whole low 898aa34ab8SBenjamin Herrenschmidt * word. 908aa34ab8SBenjamin Herrenschmidt */ 918aa34ab8SBenjamin Herrenschmidt #define LOAD_HANDLER(reg, label) \ 9261e2390eSMichael Neuling /* Handlers must be within 64K of kbase, which must be 64k aligned */ \ 9361e2390eSMichael Neuling ori reg,reg,(label)-_stext; /* virt addr of handler ... */ 948aa34ab8SBenjamin Herrenschmidt 95a5d4f3adSBenjamin Herrenschmidt /* Exception register prefixes */ 96a5d4f3adSBenjamin Herrenschmidt #define EXC_HV H 97a5d4f3adSBenjamin Herrenschmidt #define EXC_STD 98a5d4f3adSBenjamin Herrenschmidt 994700dfafSMichael Neuling #if defined(CONFIG_RELOCATABLE) 1004700dfafSMichael Neuling /* 101bc2e6c6aSMichael Neuling * If we support interrupts with relocation on AND we're a relocatable kernel, 102bc2e6c6aSMichael Neuling * we need to use CTR to get to the 2nd level handler. So, save/restore it 103bc2e6c6aSMichael Neuling * when required. 1044700dfafSMichael Neuling */ 105bc2e6c6aSMichael Neuling #define SAVE_CTR(reg, area) mfctr reg ; std reg,area+EX_CTR(r13) 106bc2e6c6aSMichael Neuling #define GET_CTR(reg, area) ld reg,area+EX_CTR(r13) 107bc2e6c6aSMichael Neuling #define RESTORE_CTR(reg, area) ld reg,area+EX_CTR(r13) ; mtctr reg 1084700dfafSMichael Neuling #else 109bc2e6c6aSMichael Neuling /* ...else CTR is unused and in register. */ 110bc2e6c6aSMichael Neuling #define SAVE_CTR(reg, area) 111bc2e6c6aSMichael Neuling #define GET_CTR(reg, area) mfctr reg 112bc2e6c6aSMichael Neuling #define RESTORE_CTR(reg, area) 1134700dfafSMichael Neuling #endif 1144700dfafSMichael Neuling 11513e7a8e8SHaren Myneni /* 11613e7a8e8SHaren Myneni * PPR save/restore macros used in exceptions_64s.S 11713e7a8e8SHaren Myneni * Used for P7 or later processors 11813e7a8e8SHaren Myneni */ 11913e7a8e8SHaren Myneni #define SAVE_PPR(area, ra, rb) \ 12013e7a8e8SHaren Myneni BEGIN_FTR_SECTION_NESTED(940) \ 12113e7a8e8SHaren Myneni ld ra,PACACURRENT(r13); \ 12213e7a8e8SHaren Myneni ld rb,area+EX_PPR(r13); /* Read PPR from paca */ \ 12313e7a8e8SHaren Myneni std rb,TASKTHREADPPR(ra); \ 12413e7a8e8SHaren Myneni END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,940) 12513e7a8e8SHaren Myneni 12613e7a8e8SHaren Myneni #define RESTORE_PPR_PACA(area, ra) \ 12713e7a8e8SHaren Myneni BEGIN_FTR_SECTION_NESTED(941) \ 12813e7a8e8SHaren Myneni ld ra,area+EX_PPR(r13); \ 12913e7a8e8SHaren Myneni mtspr SPRN_PPR,ra; \ 13013e7a8e8SHaren Myneni END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,941) 13113e7a8e8SHaren Myneni 13213e7a8e8SHaren Myneni /* 13313e7a8e8SHaren Myneni * Increase the priority on systems where PPR save/restore is not 13413e7a8e8SHaren Myneni * implemented/ supported. 13513e7a8e8SHaren Myneni */ 13613e7a8e8SHaren Myneni #define HMT_MEDIUM_PPR_DISCARD \ 13713e7a8e8SHaren Myneni BEGIN_FTR_SECTION_NESTED(942) \ 13813e7a8e8SHaren Myneni HMT_MEDIUM; \ 13913e7a8e8SHaren Myneni END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,0,942) /*non P7*/ 14013e7a8e8SHaren Myneni 14113e7a8e8SHaren Myneni /* 1421707dd16SPaul Mackerras * Get an SPR into a register if the CPU has the given feature 14313e7a8e8SHaren Myneni */ 1441707dd16SPaul Mackerras #define OPT_GET_SPR(ra, spr, ftr) \ 14513e7a8e8SHaren Myneni BEGIN_FTR_SECTION_NESTED(943) \ 1461707dd16SPaul Mackerras mfspr ra,spr; \ 1471707dd16SPaul Mackerras END_FTR_SECTION_NESTED(ftr,ftr,943) 14813e7a8e8SHaren Myneni 1491707dd16SPaul Mackerras /* 150d410ae21SMahesh Salgaonkar * Set an SPR from a register if the CPU has the given feature 151d410ae21SMahesh Salgaonkar */ 152d410ae21SMahesh Salgaonkar #define OPT_SET_SPR(ra, spr, ftr) \ 153d410ae21SMahesh Salgaonkar BEGIN_FTR_SECTION_NESTED(943) \ 154d410ae21SMahesh Salgaonkar mtspr spr,ra; \ 155d410ae21SMahesh Salgaonkar END_FTR_SECTION_NESTED(ftr,ftr,943) 156d410ae21SMahesh Salgaonkar 157d410ae21SMahesh Salgaonkar /* 1581707dd16SPaul Mackerras * Save a register to the PACA if the CPU has the given feature 1591707dd16SPaul Mackerras */ 1601707dd16SPaul Mackerras #define OPT_SAVE_REG_TO_PACA(offset, ra, ftr) \ 1611707dd16SPaul Mackerras BEGIN_FTR_SECTION_NESTED(943) \ 1621707dd16SPaul Mackerras std ra,offset(r13); \ 1631707dd16SPaul Mackerras END_FTR_SECTION_NESTED(ftr,ftr,943) 1641707dd16SPaul Mackerras 1651707dd16SPaul Mackerras #define EXCEPTION_PROLOG_0(area) \ 1662dd60d79SBenjamin Herrenschmidt GET_PACA(r13); \ 16744e9309fSHaren Myneni std r9,area+EX_R9(r13); /* save r9 */ \ 1681707dd16SPaul Mackerras OPT_GET_SPR(r9, SPRN_PPR, CPU_FTR_HAS_PPR); \ 1691707dd16SPaul Mackerras HMT_MEDIUM; \ 17044e9309fSHaren Myneni std r10,area+EX_R10(r13); /* save r10 - r12 */ \ 1711707dd16SPaul Mackerras OPT_GET_SPR(r10, SPRN_CFAR, CPU_FTR_CFAR) 1721707dd16SPaul Mackerras 1731707dd16SPaul Mackerras #define __EXCEPTION_PROLOG_1(area, extra, vec) \ 1741707dd16SPaul Mackerras OPT_SAVE_REG_TO_PACA(area+EX_PPR, r9, CPU_FTR_HAS_PPR); \ 1751707dd16SPaul Mackerras OPT_SAVE_REG_TO_PACA(area+EX_CFAR, r10, CPU_FTR_CFAR); \ 176bc2e6c6aSMichael Neuling SAVE_CTR(r10, area); \ 177b01c8b54SPaul Mackerras mfcr r9; \ 178b01c8b54SPaul Mackerras extra(vec); \ 179b01c8b54SPaul Mackerras std r11,area+EX_R11(r13); \ 180b01c8b54SPaul Mackerras std r12,area+EX_R12(r13); \ 181b01c8b54SPaul Mackerras GET_SCRATCH0(r10); \ 182b01c8b54SPaul Mackerras std r10,area+EX_R13(r13) 183b01c8b54SPaul Mackerras #define EXCEPTION_PROLOG_1(area, extra, vec) \ 184b01c8b54SPaul Mackerras __EXCEPTION_PROLOG_1(area, extra, vec) 1858aa34ab8SBenjamin Herrenschmidt 186a5d4f3adSBenjamin Herrenschmidt #define __EXCEPTION_PROLOG_PSERIES_1(label, h) \ 1878aa34ab8SBenjamin Herrenschmidt ld r12,PACAKBASE(r13); /* get high part of &label */ \ 1888aa34ab8SBenjamin Herrenschmidt ld r10,PACAKMSR(r13); /* get MSR value for kernel */ \ 189a5d4f3adSBenjamin Herrenschmidt mfspr r11,SPRN_##h##SRR0; /* save SRR0 */ \ 1908aa34ab8SBenjamin Herrenschmidt LOAD_HANDLER(r12,label) \ 191a5d4f3adSBenjamin Herrenschmidt mtspr SPRN_##h##SRR0,r12; \ 192a5d4f3adSBenjamin Herrenschmidt mfspr r12,SPRN_##h##SRR1; /* and SRR1 */ \ 193a5d4f3adSBenjamin Herrenschmidt mtspr SPRN_##h##SRR1,r10; \ 194a5d4f3adSBenjamin Herrenschmidt h##rfid; \ 1958aa34ab8SBenjamin Herrenschmidt b . /* prevent speculative execution */ 196a5d4f3adSBenjamin Herrenschmidt #define EXCEPTION_PROLOG_PSERIES_1(label, h) \ 197a5d4f3adSBenjamin Herrenschmidt __EXCEPTION_PROLOG_PSERIES_1(label, h) 1988aa34ab8SBenjamin Herrenschmidt 199b01c8b54SPaul Mackerras #define EXCEPTION_PROLOG_PSERIES(area, label, h, extra, vec) \ 2001707dd16SPaul Mackerras EXCEPTION_PROLOG_0(area); \ 201b01c8b54SPaul Mackerras EXCEPTION_PROLOG_1(area, extra, vec); \ 202a5d4f3adSBenjamin Herrenschmidt EXCEPTION_PROLOG_PSERIES_1(label, h); 203c5a8c0c9SBenjamin Herrenschmidt 204b01c8b54SPaul Mackerras #define __KVMTEST(n) \ 2053c42bf8aSPaul Mackerras lbz r10,HSTATE_IN_GUEST(r13); \ 206b01c8b54SPaul Mackerras cmpwi r10,0; \ 207b01c8b54SPaul Mackerras bne do_kvm_##n 208b01c8b54SPaul Mackerras 209dd96b2c2SAneesh Kumar K.V #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE 210dd96b2c2SAneesh Kumar K.V /* 211dd96b2c2SAneesh Kumar K.V * If hv is possible, interrupts come into to the hv version 212dd96b2c2SAneesh Kumar K.V * of the kvmppc_interrupt code, which then jumps to the PR handler, 213dd96b2c2SAneesh Kumar K.V * kvmppc_interrupt_pr, if the guest is a PR guest. 214dd96b2c2SAneesh Kumar K.V */ 215dd96b2c2SAneesh Kumar K.V #define kvmppc_interrupt kvmppc_interrupt_hv 216dd96b2c2SAneesh Kumar K.V #else 217dd96b2c2SAneesh Kumar K.V #define kvmppc_interrupt kvmppc_interrupt_pr 218dd96b2c2SAneesh Kumar K.V #endif 219dd96b2c2SAneesh Kumar K.V 220b01c8b54SPaul Mackerras #define __KVM_HANDLER(area, h, n) \ 221b01c8b54SPaul Mackerras do_kvm_##n: \ 2220acb9111SPaul Mackerras BEGIN_FTR_SECTION_NESTED(947) \ 2230acb9111SPaul Mackerras ld r10,area+EX_CFAR(r13); \ 2240acb9111SPaul Mackerras std r10,HSTATE_CFAR(r13); \ 2250acb9111SPaul Mackerras END_FTR_SECTION_NESTED(CPU_FTR_CFAR,CPU_FTR_CFAR,947); \ 2264b8473c9SPaul Mackerras BEGIN_FTR_SECTION_NESTED(948) \ 2274b8473c9SPaul Mackerras ld r10,area+EX_PPR(r13); \ 2284b8473c9SPaul Mackerras std r10,HSTATE_PPR(r13); \ 2294b8473c9SPaul Mackerras END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,948); \ 230b01c8b54SPaul Mackerras ld r10,area+EX_R10(r13); \ 2313c42bf8aSPaul Mackerras stw r9,HSTATE_SCRATCH1(r13); \ 232b01c8b54SPaul Mackerras ld r9,area+EX_R9(r13); \ 2333c42bf8aSPaul Mackerras std r12,HSTATE_SCRATCH0(r13); \ 234b01c8b54SPaul Mackerras li r12,n; \ 235b01c8b54SPaul Mackerras b kvmppc_interrupt 236b01c8b54SPaul Mackerras 237b01c8b54SPaul Mackerras #define __KVM_HANDLER_SKIP(area, h, n) \ 238b01c8b54SPaul Mackerras do_kvm_##n: \ 239b01c8b54SPaul Mackerras cmpwi r10,KVM_GUEST_MODE_SKIP; \ 240b01c8b54SPaul Mackerras ld r10,area+EX_R10(r13); \ 241b01c8b54SPaul Mackerras beq 89f; \ 2423c42bf8aSPaul Mackerras stw r9,HSTATE_SCRATCH1(r13); \ 2434b8473c9SPaul Mackerras BEGIN_FTR_SECTION_NESTED(948) \ 2444b8473c9SPaul Mackerras ld r9,area+EX_PPR(r13); \ 2454b8473c9SPaul Mackerras std r9,HSTATE_PPR(r13); \ 2464b8473c9SPaul Mackerras END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,948); \ 247b01c8b54SPaul Mackerras ld r9,area+EX_R9(r13); \ 2483c42bf8aSPaul Mackerras std r12,HSTATE_SCRATCH0(r13); \ 249b01c8b54SPaul Mackerras li r12,n; \ 250b01c8b54SPaul Mackerras b kvmppc_interrupt; \ 251b01c8b54SPaul Mackerras 89: mtocrf 0x80,r9; \ 252b01c8b54SPaul Mackerras ld r9,area+EX_R9(r13); \ 253b01c8b54SPaul Mackerras b kvmppc_skip_##h##interrupt 254b01c8b54SPaul Mackerras 255b01c8b54SPaul Mackerras #ifdef CONFIG_KVM_BOOK3S_64_HANDLER 256b01c8b54SPaul Mackerras #define KVMTEST(n) __KVMTEST(n) 257b01c8b54SPaul Mackerras #define KVM_HANDLER(area, h, n) __KVM_HANDLER(area, h, n) 258b01c8b54SPaul Mackerras #define KVM_HANDLER_SKIP(area, h, n) __KVM_HANDLER_SKIP(area, h, n) 259b01c8b54SPaul Mackerras 260b01c8b54SPaul Mackerras #else 261b01c8b54SPaul Mackerras #define KVMTEST(n) 262b01c8b54SPaul Mackerras #define KVM_HANDLER(area, h, n) 263b01c8b54SPaul Mackerras #define KVM_HANDLER_SKIP(area, h, n) 264b01c8b54SPaul Mackerras #endif 265b01c8b54SPaul Mackerras 2667aa79938SAneesh Kumar K.V #ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE 267de56a948SPaul Mackerras #define KVMTEST_PR(n) __KVMTEST(n) 268de56a948SPaul Mackerras #define KVM_HANDLER_PR(area, h, n) __KVM_HANDLER(area, h, n) 269de56a948SPaul Mackerras #define KVM_HANDLER_PR_SKIP(area, h, n) __KVM_HANDLER_SKIP(area, h, n) 270de56a948SPaul Mackerras 271de56a948SPaul Mackerras #else 272de56a948SPaul Mackerras #define KVMTEST_PR(n) 273de56a948SPaul Mackerras #define KVM_HANDLER_PR(area, h, n) 274de56a948SPaul Mackerras #define KVM_HANDLER_PR_SKIP(area, h, n) 275de56a948SPaul Mackerras #endif 276de56a948SPaul Mackerras 277b01c8b54SPaul Mackerras #define NOTEST(n) 278b01c8b54SPaul Mackerras 2798aa34ab8SBenjamin Herrenschmidt /* 2808aa34ab8SBenjamin Herrenschmidt * The common exception prolog is used for all except a few exceptions 2818aa34ab8SBenjamin Herrenschmidt * such as a segment miss on a kernel address. We have to be prepared 2828aa34ab8SBenjamin Herrenschmidt * to take another exception from the point where we first touch the 2838aa34ab8SBenjamin Herrenschmidt * kernel stack onwards. 2848aa34ab8SBenjamin Herrenschmidt * 2858aa34ab8SBenjamin Herrenschmidt * On entry r13 points to the paca, r9-r13 are saved in the paca, 2868aa34ab8SBenjamin Herrenschmidt * r9 contains the saved CR, r11 and r12 contain the saved SRR0 and 2878aa34ab8SBenjamin Herrenschmidt * SRR1, and relocation is on. 2888aa34ab8SBenjamin Herrenschmidt */ 2898aa34ab8SBenjamin Herrenschmidt #define EXCEPTION_PROLOG_COMMON(n, area) \ 2908aa34ab8SBenjamin Herrenschmidt andi. r10,r12,MSR_PR; /* See if coming from user */ \ 2918aa34ab8SBenjamin Herrenschmidt mr r10,r1; /* Save r1 */ \ 2928aa34ab8SBenjamin Herrenschmidt subi r1,r1,INT_FRAME_SIZE; /* alloc frame on kernel stack */ \ 2938aa34ab8SBenjamin Herrenschmidt beq- 1f; \ 2948aa34ab8SBenjamin Herrenschmidt ld r1,PACAKSAVE(r13); /* kernel stack to use */ \ 29590ff5d68SMichael Neuling 1: cmpdi cr1,r1,-INT_FRAME_SIZE; /* check if r1 is in userspace */ \ 2961977b502SPaul Mackerras blt+ cr1,3f; /* abort if it is */ \ 2971977b502SPaul Mackerras li r1,(n); /* will be reloaded later */ \ 2988aa34ab8SBenjamin Herrenschmidt sth r1,PACA_TRAP_SAVE(r13); \ 2991977b502SPaul Mackerras std r3,area+EX_R3(r13); \ 3001977b502SPaul Mackerras addi r3,r13,area; /* r3 -> where regs are saved*/ \ 301bc2e6c6aSMichael Neuling RESTORE_CTR(r1, area); \ 3028aa34ab8SBenjamin Herrenschmidt b bad_stack; \ 3038aa34ab8SBenjamin Herrenschmidt 3: std r9,_CCR(r1); /* save CR in stackframe */ \ 3048aa34ab8SBenjamin Herrenschmidt std r11,_NIP(r1); /* save SRR0 in stackframe */ \ 3058aa34ab8SBenjamin Herrenschmidt std r12,_MSR(r1); /* save SRR1 in stackframe */ \ 3068aa34ab8SBenjamin Herrenschmidt std r10,0(r1); /* make stack chain pointer */ \ 3078aa34ab8SBenjamin Herrenschmidt std r0,GPR0(r1); /* save r0 in stackframe */ \ 3088aa34ab8SBenjamin Herrenschmidt std r10,GPR1(r1); /* save r1 in stackframe */ \ 3095d75b264SHaren Myneni beq 4f; /* if from kernel mode */ \ 3108aa34ab8SBenjamin Herrenschmidt ACCOUNT_CPU_USER_ENTRY(r9, r10); \ 31144e9309fSHaren Myneni SAVE_PPR(area, r9, r10); \ 312b14a7253SMahesh Salgaonkar 4: EXCEPTION_PROLOG_COMMON_2(area) \ 313b14a7253SMahesh Salgaonkar EXCEPTION_PROLOG_COMMON_3(n) \ 314b14a7253SMahesh Salgaonkar ACCOUNT_STOLEN_TIME 315b14a7253SMahesh Salgaonkar 316b14a7253SMahesh Salgaonkar /* Save original regs values from save area to stack frame. */ 317b14a7253SMahesh Salgaonkar #define EXCEPTION_PROLOG_COMMON_2(area) \ 3188aa34ab8SBenjamin Herrenschmidt ld r9,area+EX_R9(r13); /* move r9, r10 to stackframe */ \ 3198aa34ab8SBenjamin Herrenschmidt ld r10,area+EX_R10(r13); \ 3208aa34ab8SBenjamin Herrenschmidt std r9,GPR9(r1); \ 3218aa34ab8SBenjamin Herrenschmidt std r10,GPR10(r1); \ 3228aa34ab8SBenjamin Herrenschmidt ld r9,area+EX_R11(r13); /* move r11 - r13 to stackframe */ \ 3238aa34ab8SBenjamin Herrenschmidt ld r10,area+EX_R12(r13); \ 3248aa34ab8SBenjamin Herrenschmidt ld r11,area+EX_R13(r13); \ 3258aa34ab8SBenjamin Herrenschmidt std r9,GPR11(r1); \ 3268aa34ab8SBenjamin Herrenschmidt std r10,GPR12(r1); \ 3278aa34ab8SBenjamin Herrenschmidt std r11,GPR13(r1); \ 32848404f2eSPaul Mackerras BEGIN_FTR_SECTION_NESTED(66); \ 32948404f2eSPaul Mackerras ld r10,area+EX_CFAR(r13); \ 33048404f2eSPaul Mackerras std r10,ORIG_GPR3(r1); \ 33148404f2eSPaul Mackerras END_FTR_SECTION_NESTED(CPU_FTR_CFAR, CPU_FTR_CFAR, 66); \ 332b14a7253SMahesh Salgaonkar GET_CTR(r10, area); \ 333b14a7253SMahesh Salgaonkar std r10,_CTR(r1); 334b14a7253SMahesh Salgaonkar 335b14a7253SMahesh Salgaonkar #define EXCEPTION_PROLOG_COMMON_3(n) \ 336b14a7253SMahesh Salgaonkar std r2,GPR2(r1); /* save r2 in stackframe */ \ 337b14a7253SMahesh Salgaonkar SAVE_4GPRS(3, r1); /* save r3 - r6 in stackframe */ \ 338b14a7253SMahesh Salgaonkar SAVE_2GPRS(7, r1); /* save r7, r8 in stackframe */ \ 339bc2e6c6aSMichael Neuling mflr r9; /* Get LR, later save to stack */ \ 3408aa34ab8SBenjamin Herrenschmidt ld r2,PACATOC(r13); /* get kernel TOC into r2 */ \ 3418aa34ab8SBenjamin Herrenschmidt std r9,_LINK(r1); \ 3428aa34ab8SBenjamin Herrenschmidt lbz r10,PACASOFTIRQEN(r13); \ 3438aa34ab8SBenjamin Herrenschmidt mfspr r11,SPRN_XER; /* save XER in stackframe */ \ 3448aa34ab8SBenjamin Herrenschmidt std r10,SOFTE(r1); \ 3458aa34ab8SBenjamin Herrenschmidt std r11,_XER(r1); \ 3468aa34ab8SBenjamin Herrenschmidt li r9,(n)+1; \ 3478aa34ab8SBenjamin Herrenschmidt std r9,_TRAP(r1); /* set trap number */ \ 3488aa34ab8SBenjamin Herrenschmidt li r10,0; \ 3498aa34ab8SBenjamin Herrenschmidt ld r11,exception_marker@toc(r2); \ 3508aa34ab8SBenjamin Herrenschmidt std r10,RESULT(r1); /* clear regs->result */ \ 351b14a7253SMahesh Salgaonkar std r11,STACK_FRAME_OVERHEAD-16(r1); /* mark the frame */ 3528aa34ab8SBenjamin Herrenschmidt 3538aa34ab8SBenjamin Herrenschmidt /* 3548aa34ab8SBenjamin Herrenschmidt * Exception vectors. 3558aa34ab8SBenjamin Herrenschmidt */ 356b3e6b5dfSBenjamin Herrenschmidt #define STD_EXCEPTION_PSERIES(loc, vec, label) \ 357b3e6b5dfSBenjamin Herrenschmidt . = loc; \ 3588aa34ab8SBenjamin Herrenschmidt .globl label##_pSeries; \ 3598aa34ab8SBenjamin Herrenschmidt label##_pSeries: \ 36044e9309fSHaren Myneni HMT_MEDIUM_PPR_DISCARD; \ 361673b189aSPaul Mackerras SET_SCRATCH0(r13); /* save r13 */ \ 362b01c8b54SPaul Mackerras EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, label##_common, \ 363de56a948SPaul Mackerras EXC_STD, KVMTEST_PR, vec) 3648aa34ab8SBenjamin Herrenschmidt 3651707dd16SPaul Mackerras /* Version of above for when we have to branch out-of-line */ 3661707dd16SPaul Mackerras #define STD_EXCEPTION_PSERIES_OOL(vec, label) \ 3671707dd16SPaul Mackerras .globl label##_pSeries; \ 3681707dd16SPaul Mackerras label##_pSeries: \ 3691707dd16SPaul Mackerras EXCEPTION_PROLOG_1(PACA_EXGEN, KVMTEST_PR, vec); \ 3701707dd16SPaul Mackerras EXCEPTION_PROLOG_PSERIES_1(label##_common, EXC_STD) 3711707dd16SPaul Mackerras 372b3e6b5dfSBenjamin Herrenschmidt #define STD_EXCEPTION_HV(loc, vec, label) \ 373b3e6b5dfSBenjamin Herrenschmidt . = loc; \ 374b3e6b5dfSBenjamin Herrenschmidt .globl label##_hv; \ 375b3e6b5dfSBenjamin Herrenschmidt label##_hv: \ 37644e9309fSHaren Myneni HMT_MEDIUM_PPR_DISCARD; \ 377673b189aSPaul Mackerras SET_SCRATCH0(r13); /* save r13 */ \ 378b01c8b54SPaul Mackerras EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, label##_common, \ 379b01c8b54SPaul Mackerras EXC_HV, KVMTEST, vec) 3808aa34ab8SBenjamin Herrenschmidt 3811707dd16SPaul Mackerras /* Version of above for when we have to branch out-of-line */ 3821707dd16SPaul Mackerras #define STD_EXCEPTION_HV_OOL(vec, label) \ 3831707dd16SPaul Mackerras .globl label##_hv; \ 3841707dd16SPaul Mackerras label##_hv: \ 3851707dd16SPaul Mackerras EXCEPTION_PROLOG_1(PACA_EXGEN, KVMTEST, vec); \ 3861707dd16SPaul Mackerras EXCEPTION_PROLOG_PSERIES_1(label##_common, EXC_HV) 3871707dd16SPaul Mackerras 3884700dfafSMichael Neuling #define STD_RELON_EXCEPTION_PSERIES(loc, vec, label) \ 3894700dfafSMichael Neuling . = loc; \ 3904700dfafSMichael Neuling .globl label##_relon_pSeries; \ 3914700dfafSMichael Neuling label##_relon_pSeries: \ 39244e9309fSHaren Myneni HMT_MEDIUM_PPR_DISCARD; \ 3934700dfafSMichael Neuling /* No guest interrupts come through here */ \ 3944700dfafSMichael Neuling SET_SCRATCH0(r13); /* save r13 */ \ 3954700dfafSMichael Neuling EXCEPTION_RELON_PROLOG_PSERIES(PACA_EXGEN, label##_common, \ 396c9f69518SMichael Ellerman EXC_STD, NOTEST, vec) 3974700dfafSMichael Neuling 3981707dd16SPaul Mackerras #define STD_RELON_EXCEPTION_PSERIES_OOL(vec, label) \ 3991707dd16SPaul Mackerras .globl label##_relon_pSeries; \ 4001707dd16SPaul Mackerras label##_relon_pSeries: \ 401c9f69518SMichael Ellerman EXCEPTION_PROLOG_1(PACA_EXGEN, NOTEST, vec); \ 4021707dd16SPaul Mackerras EXCEPTION_RELON_PROLOG_PSERIES_1(label##_common, EXC_STD) 4031707dd16SPaul Mackerras 4044700dfafSMichael Neuling #define STD_RELON_EXCEPTION_HV(loc, vec, label) \ 4054700dfafSMichael Neuling . = loc; \ 4064700dfafSMichael Neuling .globl label##_relon_hv; \ 4074700dfafSMichael Neuling label##_relon_hv: \ 40844e9309fSHaren Myneni HMT_MEDIUM_PPR_DISCARD; \ 4094700dfafSMichael Neuling /* No guest interrupts come through here */ \ 4104700dfafSMichael Neuling SET_SCRATCH0(r13); /* save r13 */ \ 4114700dfafSMichael Neuling EXCEPTION_RELON_PROLOG_PSERIES(PACA_EXGEN, label##_common, \ 412c9f69518SMichael Ellerman EXC_HV, NOTEST, vec) 4134700dfafSMichael Neuling 4141707dd16SPaul Mackerras #define STD_RELON_EXCEPTION_HV_OOL(vec, label) \ 4151707dd16SPaul Mackerras .globl label##_relon_hv; \ 4161707dd16SPaul Mackerras label##_relon_hv: \ 417c9f69518SMichael Ellerman EXCEPTION_PROLOG_1(PACA_EXGEN, NOTEST, vec); \ 4181707dd16SPaul Mackerras EXCEPTION_RELON_PROLOG_PSERIES_1(label##_common, EXC_HV) 4191707dd16SPaul Mackerras 4207230c564SBenjamin Herrenschmidt /* This associate vector numbers with bits in paca->irq_happened */ 4217230c564SBenjamin Herrenschmidt #define SOFTEN_VALUE_0x500 PACA_IRQ_EE 4227230c564SBenjamin Herrenschmidt #define SOFTEN_VALUE_0x502 PACA_IRQ_EE 4237230c564SBenjamin Herrenschmidt #define SOFTEN_VALUE_0x900 PACA_IRQ_DEC 4247230c564SBenjamin Herrenschmidt #define SOFTEN_VALUE_0x982 PACA_IRQ_DEC 4251dbdafecSIan Munsie #define SOFTEN_VALUE_0xa00 PACA_IRQ_DBELL 426655bb3f4SIan Munsie #define SOFTEN_VALUE_0xe80 PACA_IRQ_DBELL 427655bb3f4SIan Munsie #define SOFTEN_VALUE_0xe82 PACA_IRQ_DBELL 4287230c564SBenjamin Herrenschmidt 4297230c564SBenjamin Herrenschmidt #define __SOFTEN_TEST(h, vec) \ 4308aa34ab8SBenjamin Herrenschmidt lbz r10,PACASOFTIRQEN(r13); \ 4318aa34ab8SBenjamin Herrenschmidt cmpwi r10,0; \ 4327230c564SBenjamin Herrenschmidt li r10,SOFTEN_VALUE_##vec; \ 433b01c8b54SPaul Mackerras beq masked_##h##interrupt 4347230c564SBenjamin Herrenschmidt #define _SOFTEN_TEST(h, vec) __SOFTEN_TEST(h, vec) 435b01c8b54SPaul Mackerras 436de56a948SPaul Mackerras #define SOFTEN_TEST_PR(vec) \ 437de56a948SPaul Mackerras KVMTEST_PR(vec); \ 4387230c564SBenjamin Herrenschmidt _SOFTEN_TEST(EXC_STD, vec) 439b01c8b54SPaul Mackerras 440b01c8b54SPaul Mackerras #define SOFTEN_TEST_HV(vec) \ 441b01c8b54SPaul Mackerras KVMTEST(vec); \ 4427230c564SBenjamin Herrenschmidt _SOFTEN_TEST(EXC_HV, vec) 443b01c8b54SPaul Mackerras 4449e368f29SPaul Mackerras #define SOFTEN_TEST_HV_201(vec) \ 4459e368f29SPaul Mackerras KVMTEST(vec); \ 4467230c564SBenjamin Herrenschmidt _SOFTEN_TEST(EXC_STD, vec) 4479e368f29SPaul Mackerras 4484700dfafSMichael Neuling #define SOFTEN_NOTEST_PR(vec) _SOFTEN_TEST(EXC_STD, vec) 4494700dfafSMichael Neuling #define SOFTEN_NOTEST_HV(vec) _SOFTEN_TEST(EXC_HV, vec) 4504700dfafSMichael Neuling 451b01c8b54SPaul Mackerras #define __MASKABLE_EXCEPTION_PSERIES(vec, label, h, extra) \ 452b01c8b54SPaul Mackerras SET_SCRATCH0(r13); /* save r13 */ \ 4531707dd16SPaul Mackerras EXCEPTION_PROLOG_0(PACA_EXGEN); \ 454b01c8b54SPaul Mackerras __EXCEPTION_PROLOG_1(PACA_EXGEN, extra, vec); \ 455b01c8b54SPaul Mackerras EXCEPTION_PROLOG_PSERIES_1(label##_common, h); 4561707dd16SPaul Mackerras 457b01c8b54SPaul Mackerras #define _MASKABLE_EXCEPTION_PSERIES(vec, label, h, extra) \ 458b01c8b54SPaul Mackerras __MASKABLE_EXCEPTION_PSERIES(vec, label, h, extra) 459b3e6b5dfSBenjamin Herrenschmidt 460b3e6b5dfSBenjamin Herrenschmidt #define MASKABLE_EXCEPTION_PSERIES(loc, vec, label) \ 461b3e6b5dfSBenjamin Herrenschmidt . = loc; \ 462b3e6b5dfSBenjamin Herrenschmidt .globl label##_pSeries; \ 463b3e6b5dfSBenjamin Herrenschmidt label##_pSeries: \ 464a485c709SPaul Mackerras HMT_MEDIUM_PPR_DISCARD; \ 465b01c8b54SPaul Mackerras _MASKABLE_EXCEPTION_PSERIES(vec, label, \ 466de56a948SPaul Mackerras EXC_STD, SOFTEN_TEST_PR) 467b3e6b5dfSBenjamin Herrenschmidt 468b3e6b5dfSBenjamin Herrenschmidt #define MASKABLE_EXCEPTION_HV(loc, vec, label) \ 469b3e6b5dfSBenjamin Herrenschmidt . = loc; \ 470b3e6b5dfSBenjamin Herrenschmidt .globl label##_hv; \ 471b3e6b5dfSBenjamin Herrenschmidt label##_hv: \ 472b01c8b54SPaul Mackerras _MASKABLE_EXCEPTION_PSERIES(vec, label, \ 473b01c8b54SPaul Mackerras EXC_HV, SOFTEN_TEST_HV) 4748aa34ab8SBenjamin Herrenschmidt 4751707dd16SPaul Mackerras #define MASKABLE_EXCEPTION_HV_OOL(vec, label) \ 4761707dd16SPaul Mackerras .globl label##_hv; \ 4771707dd16SPaul Mackerras label##_hv: \ 4781707dd16SPaul Mackerras EXCEPTION_PROLOG_1(PACA_EXGEN, SOFTEN_TEST_HV, vec); \ 4791707dd16SPaul Mackerras EXCEPTION_PROLOG_PSERIES_1(label##_common, EXC_HV); 4801707dd16SPaul Mackerras 4814700dfafSMichael Neuling #define __MASKABLE_RELON_EXCEPTION_PSERIES(vec, label, h, extra) \ 48244e9309fSHaren Myneni HMT_MEDIUM_PPR_DISCARD; \ 4834700dfafSMichael Neuling SET_SCRATCH0(r13); /* save r13 */ \ 4841707dd16SPaul Mackerras EXCEPTION_PROLOG_0(PACA_EXGEN); \ 4854700dfafSMichael Neuling __EXCEPTION_PROLOG_1(PACA_EXGEN, extra, vec); \ 4864700dfafSMichael Neuling EXCEPTION_RELON_PROLOG_PSERIES_1(label##_common, h); 4874700dfafSMichael Neuling #define _MASKABLE_RELON_EXCEPTION_PSERIES(vec, label, h, extra) \ 4884700dfafSMichael Neuling __MASKABLE_RELON_EXCEPTION_PSERIES(vec, label, h, extra) 4894700dfafSMichael Neuling 4904700dfafSMichael Neuling #define MASKABLE_RELON_EXCEPTION_PSERIES(loc, vec, label) \ 4914700dfafSMichael Neuling . = loc; \ 4924700dfafSMichael Neuling .globl label##_relon_pSeries; \ 4934700dfafSMichael Neuling label##_relon_pSeries: \ 4944700dfafSMichael Neuling _MASKABLE_RELON_EXCEPTION_PSERIES(vec, label, \ 4954700dfafSMichael Neuling EXC_STD, SOFTEN_NOTEST_PR) 4964700dfafSMichael Neuling 4974700dfafSMichael Neuling #define MASKABLE_RELON_EXCEPTION_HV(loc, vec, label) \ 4984700dfafSMichael Neuling . = loc; \ 4994700dfafSMichael Neuling .globl label##_relon_hv; \ 5004700dfafSMichael Neuling label##_relon_hv: \ 5014700dfafSMichael Neuling _MASKABLE_RELON_EXCEPTION_PSERIES(vec, label, \ 5024700dfafSMichael Neuling EXC_HV, SOFTEN_NOTEST_HV) 5034700dfafSMichael Neuling 5041707dd16SPaul Mackerras #define MASKABLE_RELON_EXCEPTION_HV_OOL(vec, label) \ 5051707dd16SPaul Mackerras .globl label##_relon_hv; \ 5061707dd16SPaul Mackerras label##_relon_hv: \ 5071707dd16SPaul Mackerras EXCEPTION_PROLOG_1(PACA_EXGEN, SOFTEN_NOTEST_HV, vec); \ 5081707dd16SPaul Mackerras EXCEPTION_PROLOG_PSERIES_1(label##_common, EXC_HV); 5091707dd16SPaul Mackerras 5101b701179SBenjamin Herrenschmidt /* 5111b701179SBenjamin Herrenschmidt * Our exception common code can be passed various "additions" 5121b701179SBenjamin Herrenschmidt * to specify the behaviour of interrupts, whether to kick the 5131b701179SBenjamin Herrenschmidt * runlatch, etc... 5141b701179SBenjamin Herrenschmidt */ 5151b701179SBenjamin Herrenschmidt 5169daf112bSMichael Ellerman /* 5179daf112bSMichael Ellerman * This addition reconciles our actual IRQ state with the various software 5189daf112bSMichael Ellerman * flags that track it. This may call C code. 5199daf112bSMichael Ellerman */ 5209daf112bSMichael Ellerman #define ADD_RECONCILE RECONCILE_IRQ_STATE(r10,r11) 5218aa34ab8SBenjamin Herrenschmidt 522fe1952fcSBenjamin Herrenschmidt #define ADD_NVGPRS \ 523b1576fecSAnton Blanchard bl save_nvgprs 524fe1952fcSBenjamin Herrenschmidt 525fe1952fcSBenjamin Herrenschmidt #define RUNLATCH_ON \ 526fe1952fcSBenjamin Herrenschmidt BEGIN_FTR_SECTION \ 5279778b696SStuart Yoder CURRENT_THREAD_INFO(r3, r1); \ 528fe1952fcSBenjamin Herrenschmidt ld r4,TI_LOCAL_FLAGS(r3); \ 529fe1952fcSBenjamin Herrenschmidt andi. r0,r4,_TLF_RUNLATCH; \ 530fe1952fcSBenjamin Herrenschmidt beql ppc64_runlatch_on_trampoline; \ 531fe1952fcSBenjamin Herrenschmidt END_FTR_SECTION_IFSET(CPU_FTR_CTRL) 532fe1952fcSBenjamin Herrenschmidt 533fe1952fcSBenjamin Herrenschmidt #define EXCEPTION_COMMON(trap, label, hdlr, ret, additions) \ 5348aa34ab8SBenjamin Herrenschmidt .align 7; \ 5358aa34ab8SBenjamin Herrenschmidt .globl label##_common; \ 5368aa34ab8SBenjamin Herrenschmidt label##_common: \ 5378aa34ab8SBenjamin Herrenschmidt EXCEPTION_PROLOG_COMMON(trap, PACA_EXGEN); \ 538a1d711c5SMichael Ellerman /* Volatile regs are potentially clobbered here */ \ 539fe1952fcSBenjamin Herrenschmidt additions; \ 5408aa34ab8SBenjamin Herrenschmidt addi r3,r1,STACK_FRAME_OVERHEAD; \ 5418aa34ab8SBenjamin Herrenschmidt bl hdlr; \ 542fe1952fcSBenjamin Herrenschmidt b ret 543fe1952fcSBenjamin Herrenschmidt 544fe1952fcSBenjamin Herrenschmidt #define STD_EXCEPTION_COMMON(trap, label, hdlr) \ 545fe1952fcSBenjamin Herrenschmidt EXCEPTION_COMMON(trap, label, hdlr, ret_from_except, \ 5469daf112bSMichael Ellerman ADD_NVGPRS;ADD_RECONCILE) 5478aa34ab8SBenjamin Herrenschmidt 5488aa34ab8SBenjamin Herrenschmidt /* 5498aa34ab8SBenjamin Herrenschmidt * Like STD_EXCEPTION_COMMON, but for exceptions that can occur 5507450f6f0SBenjamin Herrenschmidt * in the idle task and therefore need the special idle handling 5517450f6f0SBenjamin Herrenschmidt * (finish nap and runlatch) 5528aa34ab8SBenjamin Herrenschmidt */ 5537450f6f0SBenjamin Herrenschmidt #define STD_EXCEPTION_COMMON_ASYNC(trap, label, hdlr) \ 554fe1952fcSBenjamin Herrenschmidt EXCEPTION_COMMON(trap, label, hdlr, ret_from_except_lite, \ 5559daf112bSMichael Ellerman FINISH_NAP;ADD_RECONCILE;RUNLATCH_ON) 5568aa34ab8SBenjamin Herrenschmidt 5578aa34ab8SBenjamin Herrenschmidt /* 5588aa34ab8SBenjamin Herrenschmidt * When the idle code in power4_idle puts the CPU into NAP mode, 5598aa34ab8SBenjamin Herrenschmidt * it has to do so in a loop, and relies on the external interrupt 5608aa34ab8SBenjamin Herrenschmidt * and decrementer interrupt entry code to get it out of the loop. 5618aa34ab8SBenjamin Herrenschmidt * It sets the _TLF_NAPPING bit in current_thread_info()->local_flags 5628aa34ab8SBenjamin Herrenschmidt * to signal that it is in the loop and needs help to get out. 5638aa34ab8SBenjamin Herrenschmidt */ 5648aa34ab8SBenjamin Herrenschmidt #ifdef CONFIG_PPC_970_NAP 5658aa34ab8SBenjamin Herrenschmidt #define FINISH_NAP \ 5668aa34ab8SBenjamin Herrenschmidt BEGIN_FTR_SECTION \ 5679778b696SStuart Yoder CURRENT_THREAD_INFO(r11, r1); \ 5688aa34ab8SBenjamin Herrenschmidt ld r9,TI_LOCAL_FLAGS(r11); \ 5698aa34ab8SBenjamin Herrenschmidt andi. r10,r9,_TLF_NAPPING; \ 5708aa34ab8SBenjamin Herrenschmidt bnel power4_fixup_nap; \ 5718aa34ab8SBenjamin Herrenschmidt END_FTR_SECTION_IFSET(CPU_FTR_CAN_NAP) 5728aa34ab8SBenjamin Herrenschmidt #else 5738aa34ab8SBenjamin Herrenschmidt #define FINISH_NAP 5748aa34ab8SBenjamin Herrenschmidt #endif 5758aa34ab8SBenjamin Herrenschmidt 5768aa34ab8SBenjamin Herrenschmidt #endif /* _ASM_POWERPC_EXCEPTION_H */ 577