#include #include #include #include #include /* * 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; /* * 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. */ static int __init setup_elfcorehdr(char *arg) { char *end; if (!arg) return -EINVAL; elfcorehdr_addr = memparse(arg, &end); return end > arg ? 0 : -EINVAL; } early_param("elfcorehdr", setup_elfcorehdr);