cregit-Linux how code gets into the kernel

Release 4.15 kernel/crash_dump.c

Directory: kernel
#include <linux/kernel.h>
#include <linux/crash_dump.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/export.h>

/*
 * If we have booted due to a crash, max_pfn will be a very low value. We need
 * to know the amount of memory that the previous kernel used.
 */

unsigned long saved_max_pfn;

/*
 * stores the physical address of elf header of crash image
 *
 * Note: elfcorehdr_addr is not just limited to vmcore. It is also used by
 * is_kdump_kernel() to determine if we are booting after a panic. Hence put
 * it under CONFIG_CRASH_DUMP and not CONFIG_PROC_VMCORE.
 */

unsigned long long elfcorehdr_addr = ELFCORE_ADDR_MAX;

EXPORT_SYMBOL_GPL(elfcorehdr_addr);

/*
 * stores the size of elf header of crash image
 */

unsigned long long elfcorehdr_size;

/*
 * elfcorehdr= specifies the location of elf core header stored by the crashed
 * kernel. This option will be passed by kexec loader to the capture kernel.
 *
 * Syntax: elfcorehdr=[size[KMG]@]offset[KMG]
 */

static int __init setup_elfcorehdr(char *arg) { char *end; if (!arg) return -EINVAL; elfcorehdr_addr = memparse(arg, &end); if (*end == '@') { elfcorehdr_size = elfcorehdr_addr; elfcorehdr_addr = memparse(end + 1, &end); } return end > arg ? 0 : -EINVAL; }

Contributors

PersonTokensPropCommitsCommitProp
Olaf Hering4463.77%150.00%
Michael Holzheu2536.23%150.00%
Total69100.00%2100.00%

early_param("elfcorehdr", setup_elfcorehdr);

Overall Contributors

PersonTokensPropCommitsCommitProp
Olaf Hering7867.24%125.00%
Michael Holzheu3227.59%125.00%
Amir Vadai54.31%125.00%
Paul Gortmaker10.86%125.00%
Total116100.00%4100.00%
Directory: kernel
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