mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-24 05:04:00 +08:00
9833c39400
Allow architectures to redefine this macro if needed. This is useful for example in architectures where 64-bit ELF vmcores are not supported. Specifying zero vmcore_elf64_check_arch() allows compiler to optimize away unnecessary parts of parse_crash_elf64_headers(). We also rename the macro to vmcore_elf64_check_arch() to reflect that it is used for 64-bit vmcores only. Signed-off-by: Mika Westerberg <mika.westerberg@iki.fi> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
75 lines
2.1 KiB
C
75 lines
2.1 KiB
C
#ifndef LINUX_CRASH_DUMP_H
|
|
#define LINUX_CRASH_DUMP_H
|
|
|
|
#ifdef CONFIG_CRASH_DUMP
|
|
#include <linux/kexec.h>
|
|
#include <linux/device.h>
|
|
#include <linux/proc_fs.h>
|
|
|
|
#define ELFCORE_ADDR_MAX (-1ULL)
|
|
#define ELFCORE_ADDR_ERR (-2ULL)
|
|
|
|
extern unsigned long long elfcorehdr_addr;
|
|
|
|
extern ssize_t copy_oldmem_page(unsigned long, char *, size_t,
|
|
unsigned long, int);
|
|
|
|
/* Architecture code defines this if there are other possible ELF
|
|
* machine types, e.g. on bi-arch capable hardware. */
|
|
#ifndef vmcore_elf_check_arch_cross
|
|
#define vmcore_elf_check_arch_cross(x) 0
|
|
#endif
|
|
|
|
/*
|
|
* Architecture code can redefine this if there are any special checks
|
|
* needed for 64-bit ELF vmcores. In case of 32-bit only architecture,
|
|
* this can be set to zero.
|
|
*/
|
|
#ifndef vmcore_elf64_check_arch
|
|
#define vmcore_elf64_check_arch(x) (elf_check_arch(x) || vmcore_elf_check_arch_cross(x))
|
|
#endif
|
|
|
|
/*
|
|
* is_kdump_kernel() checks whether this kernel is booting after a panic of
|
|
* previous kernel or not. This is determined by checking if previous kernel
|
|
* has passed the elf core header address on command line.
|
|
*
|
|
* This is not just a test if CONFIG_CRASH_DUMP is enabled or not. It will
|
|
* return 1 if CONFIG_CRASH_DUMP=y and if kernel is booting after a panic of
|
|
* previous kernel.
|
|
*/
|
|
|
|
static inline int is_kdump_kernel(void)
|
|
{
|
|
return (elfcorehdr_addr != ELFCORE_ADDR_MAX) ? 1 : 0;
|
|
}
|
|
|
|
/* is_vmcore_usable() checks if the kernel is booting after a panic and
|
|
* the vmcore region is usable.
|
|
*
|
|
* This makes use of the fact that due to alignment -2ULL is not
|
|
* a valid pointer, much in the vain of IS_ERR(), except
|
|
* dealing directly with an unsigned long long rather than a pointer.
|
|
*/
|
|
|
|
static inline int is_vmcore_usable(void)
|
|
{
|
|
return is_kdump_kernel() && elfcorehdr_addr != ELFCORE_ADDR_ERR ? 1 : 0;
|
|
}
|
|
|
|
/* vmcore_unusable() marks the vmcore as unusable,
|
|
* without disturbing the logic of is_kdump_kernel()
|
|
*/
|
|
|
|
static inline void vmcore_unusable(void)
|
|
{
|
|
if (is_kdump_kernel())
|
|
elfcorehdr_addr = ELFCORE_ADDR_ERR;
|
|
}
|
|
#else /* !CONFIG_CRASH_DUMP */
|
|
static inline int is_kdump_kernel(void) { return 0; }
|
|
#endif /* CONFIG_CRASH_DUMP */
|
|
|
|
extern unsigned long saved_max_pfn;
|
|
#endif /* LINUX_CRASHDUMP_H */
|