a80313ff91
With a relocatable kernel that could reside at any place in memory, code and data that has to stay below 2 GB needs special handling. This patch introduces .dma sections for such text, data and ex_table. The sections will be part of the decompressor kernel, so they will not be relocated and stay below 2 GB. Their location is passed over to the decompressed / relocated kernel via the .boot.preserved.data section. The duald and aste for control register setup also need to stay below 2 GB, so move the setup code from arch/s390/kernel/head64.S to arch/s390/boot/head.S. The duct and linkage_stack could reside above 2 GB, but their content has to be preserved for the decompresed kernel, so they are also moved into the .dma section. The start and end address of the .dma sections is added to vmcoreinfo, for crash support, to help debugging in case the kernel crashed there. Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com> Reviewed-by: Philipp Rudo <prudo@linux.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
82 lines
1.7 KiB
ArmAsm
82 lines
1.7 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* arch/s390/kernel/base.S
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*
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* Copyright IBM Corp. 2006, 2007
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* Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>
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* Michael Holzheu <holzheu@de.ibm.com>
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*/
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#include <linux/linkage.h>
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#include <asm/asm-offsets.h>
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#include <asm/nospec-insn.h>
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#include <asm/ptrace.h>
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#include <asm/sigp.h>
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GEN_BR_THUNK %r9
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GEN_BR_THUNK %r14
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ENTRY(s390_base_mcck_handler)
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basr %r13,0
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0: lg %r15,__LC_NODAT_STACK # load panic stack
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aghi %r15,-STACK_FRAME_OVERHEAD
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larl %r1,s390_base_mcck_handler_fn
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lg %r9,0(%r1)
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ltgr %r9,%r9
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jz 1f
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BASR_EX %r14,%r9
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1: la %r1,4095
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lmg %r0,%r15,__LC_GPREGS_SAVE_AREA-4095(%r1)
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lpswe __LC_MCK_OLD_PSW
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.section .bss
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.align 8
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.globl s390_base_mcck_handler_fn
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s390_base_mcck_handler_fn:
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.quad 0
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.previous
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ENTRY(s390_base_ext_handler)
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stmg %r0,%r15,__LC_SAVE_AREA_ASYNC
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basr %r13,0
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0: aghi %r15,-STACK_FRAME_OVERHEAD
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larl %r1,s390_base_ext_handler_fn
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lg %r9,0(%r1)
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ltgr %r9,%r9
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jz 1f
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BASR_EX %r14,%r9
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1: lmg %r0,%r15,__LC_SAVE_AREA_ASYNC
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ni __LC_EXT_OLD_PSW+1,0xfd # clear wait state bit
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lpswe __LC_EXT_OLD_PSW
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.section .bss
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.align 8
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.globl s390_base_ext_handler_fn
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s390_base_ext_handler_fn:
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.quad 0
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.previous
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ENTRY(s390_base_pgm_handler)
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stmg %r0,%r15,__LC_SAVE_AREA_SYNC
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basr %r13,0
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0: aghi %r15,-STACK_FRAME_OVERHEAD
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larl %r1,s390_base_pgm_handler_fn
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lg %r9,0(%r1)
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ltgr %r9,%r9
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jz 1f
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BASR_EX %r14,%r9
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lmg %r0,%r15,__LC_SAVE_AREA_SYNC
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lpswe __LC_PGM_OLD_PSW
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1: lpswe disabled_wait_psw-0b(%r13)
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.align 8
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disabled_wait_psw:
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.quad 0x0002000180000000,0x0000000000000000 + s390_base_pgm_handler
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.section .bss
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.align 8
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.globl s390_base_pgm_handler_fn
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s390_base_pgm_handler_fn:
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.quad 0
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.previous
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