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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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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>
40 lines
785 B
C
40 lines
785 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __ASM_LINKAGE_H
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#define __ASM_LINKAGE_H
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#include <linux/stringify.h>
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#define __ALIGN .align 4, 0x07
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#define __ALIGN_STR __stringify(__ALIGN)
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#ifndef __ASSEMBLY__
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/*
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* Helper macro for exception table entries
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*/
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#define EX_TABLE(_fault, _target) \
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".section __ex_table,\"a\"\n" \
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".align 4\n" \
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".long (" #_fault ") - .\n" \
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".long (" #_target ") - .\n" \
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".previous\n"
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#else /* __ASSEMBLY__ */
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#define EX_TABLE(_fault, _target) \
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.section __ex_table,"a" ; \
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.align 4 ; \
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.long (_fault) - . ; \
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.long (_target) - . ; \
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.previous
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#define EX_TABLE_DMA(_fault, _target) \
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.section .dma.ex_table, "a" ; \
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.align 4 ; \
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.long (_fault) - . ; \
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.long (_target) - . ; \
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.previous
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#endif /* __ASSEMBLY__ */
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#endif
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