1/* SPDX-License-Identifier: GPL-2.0 */ 2/* 3 * Copyright IBM Corp. 1999, 2010 4 * 5 * Author(s): Hartmut Penner <hp@de.ibm.com> 6 * Martin Schwidefsky <schwidefsky@de.ibm.com> 7 * Rob van der Heij <rvdhei@iae.nl> 8 * Heiko Carstens <heiko.carstens@de.ibm.com> 9 * 10 */ 11 12#include <linux/init.h> 13#include <linux/linkage.h> 14#include <asm/asm-offsets.h> 15#include <asm/thread_info.h> 16#include <asm/page.h> 17 18__HEAD 19ENTRY(startup_continue) 20 tm __LC_STFLE_FAC_LIST+5,0x80 # LPP available ? 21 jz 0f 22 xc __LC_LPP+1(7,0),__LC_LPP+1 # clear lpp and current_pid 23 mvi __LC_LPP,0x80 # and set LPP_MAGIC 24 .insn s,0xb2800000,__LC_LPP # load program parameter 250: larl %r1,tod_clock_base 26 mvc 0(16,%r1),__LC_BOOT_CLOCK 27 larl %r13,.LPG1 # get base 28 lctlg %c0,%c15,.Lctl-.LPG1(%r13) # load control registers 29 lg %r12,.Lparmaddr-.LPG1(%r13) # pointer to parameter area 30 # move IPL device to lowcore 31 larl %r0,boot_vdso_data 32 stg %r0,__LC_VDSO_PER_CPU 33# 34# Setup stack 35# 36 larl %r14,init_task 37 stg %r14,__LC_CURRENT 38 larl %r15,init_thread_union 39 aghi %r15,1<<(PAGE_SHIFT+THREAD_SIZE_ORDER) # init_task_union + THREAD_SIZE 40 stg %r15,__LC_KERNEL_STACK # set end of kernel stack 41 aghi %r15,-160 42# 43# Early setup functions that may not rely on an initialized bss section, 44# like moving the initrd. Returns with an initialized bss section. 45# 46 brasl %r14,startup_init_nobss 47# 48# Early machine initialization and detection functions. 49# 50 brasl %r14,startup_init 51 lpswe .Lentry-.LPG1(13) # jump to _stext in primary-space, 52 # virtual and never return ... 53 .align 16 54.LPG1: 55.Lentry:.quad 0x0000000180000000,_stext 56.Lctl: .quad 0x04040000 # cr0: AFP registers & secondary space 57 .quad 0 # cr1: primary space segment table 58 .quad .Lduct # cr2: dispatchable unit control table 59 .quad 0 # cr3: instruction authorization 60 .quad 0xffff # cr4: instruction authorization 61 .quad .Lduct # cr5: primary-aste origin 62 .quad 0 # cr6: I/O interrupts 63 .quad 0 # cr7: secondary space segment table 64 .quad 0 # cr8: access registers translation 65 .quad 0 # cr9: tracing off 66 .quad 0 # cr10: tracing off 67 .quad 0 # cr11: tracing off 68 .quad 0 # cr12: tracing off 69 .quad 0 # cr13: home space segment table 70 .quad 0xc0000000 # cr14: machine check handling off 71 .quad .Llinkage_stack # cr15: linkage stack operations 72.Lpcmsk:.quad 0x0000000180000000 73.L4malign:.quad 0xffffffffffc00000 74.Lscan2g:.quad 0x80000000 + 0x20000 - 8 # 2GB + 128K - 8 75.Lnop: .long 0x07000700 76.Lparmaddr: 77 .quad PARMAREA 78 .align 64 79.Lduct: .long 0,.Laste,.Laste,0,.Lduald,0,0,0 80 .long 0,0,0,0,0,0,0,0 81.Laste: .quad 0,0xffffffffffffffff,0,0,0,0,0,0 82 .align 128 83.Lduald:.rept 8 84 .long 0x80000000,0,0,0 # invalid access-list entries 85 .endr 86.Llinkage_stack: 87 .long 0,0,0x89000000,0,0,0,0x8a000000,0 88 89ENTRY(_ehead) 90 91 .org 0x100000 - 0x11000 # head.o ends at 0x11000 92# 93# startup-code, running in absolute addressing mode 94# 95ENTRY(_stext) 96 basr %r13,0 # get base 97.LPG3: 98# check control registers 99 stctg %c0,%c15,0(%r15) 100 oi 6(%r15),0x60 # enable sigp emergency & external call 101 oi 4(%r15),0x10 # switch on low address proctection 102 lctlg %c0,%c15,0(%r15) 103 104 lam 0,15,.Laregs-.LPG3(%r13) # load acrs needed by uaccess 105 brasl %r14,start_kernel # go to C code 106# 107# We returned from start_kernel ?!? PANIK 108# 109 basr %r13,0 110 lpswe .Ldw-.(%r13) # load disabled wait psw 111 112 .align 8 113.Ldw: .quad 0x0002000180000000,0x0000000000000000 114.Laregs:.long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 115