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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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c5dd858670
Reipl doesn't work on older machines were s390_reset_machine() gets called. The reason is that the text section is read-only but the variable dump_prefix_page is there. Since s390_reset_machine() writes to it we get a protection exception. Therefore move dump_prefix_page to the bss section. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
114 lines
3.3 KiB
ArmAsm
114 lines
3.3 KiB
ArmAsm
/*
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* arch/s390/kernel/reipl.S
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*
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* S390 version
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* Copyright (C) 2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
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* Author(s): Holger Smolinski (Holger.Smolinski@de.ibm.com)
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Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com)
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*/
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#include <asm/lowcore.h>
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#
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# do_reipl_asm
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# Parameter: r2 = schid of reipl device
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#
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.globl do_reipl_asm
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do_reipl_asm: basr %r13,0
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.Lpg0: lpswe .Lnewpsw-.Lpg0(%r13)
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.Lpg1: # do store status of all registers
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stg %r1,.Lregsave-.Lpg0(%r13)
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lghi %r1,0x1000
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stmg %r0,%r15,__LC_GPREGS_SAVE_AREA-0x1000(%r1)
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lg %r0,.Lregsave-.Lpg0(%r13)
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stg %r0,__LC_GPREGS_SAVE_AREA-0x1000+8(%r1)
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stctg %c0,%c15,__LC_CREGS_SAVE_AREA-0x1000(%r1)
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stam %a0,%a15,__LC_AREGS_SAVE_AREA-0x1000(%r1)
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lg %r10,.Ldump_pfx-.Lpg0(%r13)
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mvc __LC_PREFIX_SAVE_AREA-0x1000(4,%r1),0(%r10)
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stfpc __LC_FP_CREG_SAVE_AREA-0x1000(%r1)
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stckc .Lclkcmp-.Lpg0(%r13)
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mvc __LC_CLOCK_COMP_SAVE_AREA-0x1000(8,%r1),.Lclkcmp-.Lpg0(%r13)
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stpt __LC_CPU_TIMER_SAVE_AREA-0x1000(%r1)
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stg %r13, __LC_PSW_SAVE_AREA-0x1000+8(%r1)
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lctlg %c6,%c6,.Lall-.Lpg0(%r13)
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lgr %r1,%r2
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mvc __LC_PGM_NEW_PSW(16),.Lpcnew-.Lpg0(%r13)
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stsch .Lschib-.Lpg0(%r13)
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oi .Lschib+5-.Lpg0(%r13),0x84
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.Lecs: xi .Lschib+27-.Lpg0(%r13),0x01
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msch .Lschib-.Lpg0(%r13)
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lghi %r0,5
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.Lssch: ssch .Liplorb-.Lpg0(%r13)
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jz .L001
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brct %r0,.Lssch
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bas %r14,.Ldisab-.Lpg0(%r13)
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.L001: mvc __LC_IO_NEW_PSW(16),.Lionew-.Lpg0(%r13)
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.Ltpi: lpswe .Lwaitpsw-.Lpg0(%r13)
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.Lcont: c %r1,__LC_SUBCHANNEL_ID
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jnz .Ltpi
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clc __LC_IO_INT_PARM(4),.Liplorb-.Lpg0(%r13)
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jnz .Ltpi
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tsch .Liplirb-.Lpg0(%r13)
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tm .Liplirb+9-.Lpg0(%r13),0xbf
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jz .L002
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bas %r14,.Ldisab-.Lpg0(%r13)
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.L002: tm .Liplirb+8-.Lpg0(%r13),0xf3
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jz .L003
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bas %r14,.Ldisab-.Lpg0(%r13)
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.L003: st %r1,__LC_SUBCHANNEL_ID
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lhi %r1,0 # mode 0 = esa
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slr %r0,%r0 # set cpuid to zero
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sigp %r1,%r0,0x12 # switch to esa mode
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lpsw 0
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.Ldisab: sll %r14,1
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srl %r14,1 # need to kill hi bit to avoid specification exceptions.
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st %r14,.Ldispsw+12-.Lpg0(%r13)
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lpswe .Ldispsw-.Lpg0(%r13)
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.align 8
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.Lclkcmp: .quad 0x0000000000000000
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.Lall: .quad 0x00000000ff000000
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.Ldump_pfx: .quad dump_prefix_page
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.Lregsave: .quad 0x0000000000000000
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.align 16
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/*
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* These addresses have to be 31 bit otherwise
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* the sigp will throw a specifcation exception
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* when switching to ESA mode as bit 31 be set
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* in the ESA psw.
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* Bit 31 of the addresses has to be 0 for the
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* 31bit lpswe instruction a fact they appear to have
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* ommited from the pop.
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*/
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.Lnewpsw: .quad 0x0000000080000000
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.quad .Lpg1
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.Lpcnew: .quad 0x0000000080000000
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.quad .Lecs
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.Lionew: .quad 0x0000000080000000
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.quad .Lcont
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.Lwaitpsw: .quad 0x0202000080000000
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.quad .Ltpi
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.Ldispsw: .quad 0x0002000080000000
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.quad 0x0000000000000000
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.Liplccws: .long 0x02000000,0x60000018
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.long 0x08000008,0x20000001
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.Liplorb: .long 0x0049504c,0x0040ff80
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.long 0x00000000+.Liplccws
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.Lschib: .long 0x00000000,0x00000000
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.long 0x00000000,0x00000000
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.long 0x00000000,0x00000000
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.long 0x00000000,0x00000000
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.long 0x00000000,0x00000000
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.long 0x00000000,0x00000000
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.Liplirb: .long 0x00000000,0x00000000
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.long 0x00000000,0x00000000
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.long 0x00000000,0x00000000
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.long 0x00000000,0x00000000
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.long 0x00000000,0x00000000
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.long 0x00000000,0x00000000
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.long 0x00000000,0x00000000
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.long 0x00000000,0x00000000
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