d3bf37955d
Currently only the address of the pre-allocated ELF header is passed with the elfcorehdr= kernel parameter. In order to reserve memory for the header in the 2nd kernel also the size is required. Current kdump architecture backends use different methods to do that, e.g. x86 uses the memmap= kernel parameter. On s390 there is no easy way to transfer this information. Therefore the elfcorehdr kernel parameter is extended to also pass the size. This now can also be used as standard mechanism by all future kdump architecture backends. The syntax of the kernel parameter is extended as follows: elfcorehdr=[size[KMG]@]offset[KMG] This change is backward compatible because elfcorehdr=size is still allowed. Acked-by: Vivek Goyal <vgoyal@redhat.com> Acked-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
46 lines
1.2 KiB
C
46 lines
1.2 KiB
C
#include <linux/kernel.h>
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#include <linux/crash_dump.h>
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#include <linux/init.h>
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#include <linux/errno.h>
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#include <linux/module.h>
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/*
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* If we have booted due to a crash, max_pfn will be a very low value. We need
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* to know the amount of memory that the previous kernel used.
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*/
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unsigned long saved_max_pfn;
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/*
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* stores the physical address of elf header of crash image
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*
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* Note: elfcorehdr_addr is not just limited to vmcore. It is also used by
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* is_kdump_kernel() to determine if we are booting after a panic. Hence put
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* it under CONFIG_CRASH_DUMP and not CONFIG_PROC_VMCORE.
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*/
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unsigned long long elfcorehdr_addr = ELFCORE_ADDR_MAX;
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/*
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* stores the size of elf header of crash image
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*/
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unsigned long long elfcorehdr_size;
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/*
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* elfcorehdr= specifies the location of elf core header stored by the crashed
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* kernel. This option will be passed by kexec loader to the capture kernel.
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*
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* Syntax: elfcorehdr=[size[KMG]@]offset[KMG]
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*/
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static int __init setup_elfcorehdr(char *arg)
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{
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char *end;
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if (!arg)
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return -EINVAL;
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elfcorehdr_addr = memparse(arg, &end);
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if (*end == '@') {
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elfcorehdr_size = elfcorehdr_addr;
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elfcorehdr_addr = memparse(end + 1, &end);
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}
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return end > arg ? 0 : -EINVAL;
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}
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early_param("elfcorehdr", setup_elfcorehdr);
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