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s390/kernel: introduce .dma sections

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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>
This commit is contained in:
Gerald Schaefer 2019-02-03 21:37:20 +01:00 • committed by Martin Schwidefsky
parent 087c4d7423
commit a80313ff91
24 changed files with 333 additions and 187 deletions
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9
arch/s390/kernel/setup.c
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@ -101,6 +101,14 @@ unsigned long __bootdata(memory_end);
unsigned long __bootdata(max_physmem_end);
struct mem_detect_info __bootdata(mem_detect);
struct exception_table_entry *__bootdata_preserved(__start_dma_ex_table);
struct exception_table_entry *__bootdata_preserved(__stop_dma_ex_table);
unsigned long __bootdata_preserved(__swsusp_reset_dma);
unsigned long __bootdata_preserved(__stext_dma);
unsigned long __bootdata_preserved(__etext_dma);
unsigned long __bootdata_preserved(__sdma);
unsigned long __bootdata_preserved(__edma);
unsigned long VMALLOC_START;
EXPORT_SYMBOL(VMALLOC_START);
@ -832,6 +840,7 @@ static void __init reserve_kernel(void)
memblock_reserve(0, HEAD_END);
memblock_reserve((unsigned long)_stext, PFN_PHYS(start_pfn)
- (unsigned long)_stext);
memblock_reserve(__sdma, __edma - __sdma);
}
static void __init setup_memory(void)