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This patch introduces the architecture independent implementation the sys_kexec_load, the compat_sys_kexec_load system calls. Kexec on panic support has been integrated into the core patch and is relatively clean. In addition the hopefully architecture independent option crashkernel=size@location has been docuemented. It's purpose is to reserve space for the panic kernel to live, and where no DMA transfer will ever be setup to access. Signed-off-by: Eric Biederman <[email protected]> Signed-off-by: Alexander Nyberg <[email protected]> Signed-off-by: Adrian Bunk <[email protected]> Signed-off-by: Vivek Goyal <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
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@@ -1330,6 +1330,16 @@ M: [email protected] | |
L: [email protected] | ||
S: Maintained | ||
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KEXEC | ||
P: Eric Biederman | ||
P: Randy Dunlap | ||
M: [email protected] | ||
M: [email protected] | ||
W: http://www.xmission.com/~ebiederm/files/kexec/ | ||
L: [email protected] | ||
L: [email protected] | ||
S: Maintained | ||
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LANMEDIA WAN CARD DRIVER | ||
P: Andrew Stanley-Jones | ||
M: [email protected] | ||
|
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#ifndef LINUX_KEXEC_H | ||
#define LINUX_KEXEC_H | ||
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#ifdef CONFIG_KEXEC | ||
#include <linux/types.h> | ||
#include <linux/list.h> | ||
#include <linux/linkage.h> | ||
#include <linux/compat.h> | ||
#include <asm/kexec.h> | ||
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/* Verify architecture specific macros are defined */ | ||
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#ifndef KEXEC_SOURCE_MEMORY_LIMIT | ||
#error KEXEC_SOURCE_MEMORY_LIMIT not defined | ||
#endif | ||
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#ifndef KEXEC_DESTINATION_MEMORY_LIMIT | ||
#error KEXEC_DESTINATION_MEMORY_LIMIT not defined | ||
#endif | ||
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#ifndef KEXEC_CONTROL_MEMORY_LIMIT | ||
#error KEXEC_CONTROL_MEMORY_LIMIT not defined | ||
#endif | ||
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#ifndef KEXEC_CONTROL_CODE_SIZE | ||
#error KEXEC_CONTROL_CODE_SIZE not defined | ||
#endif | ||
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#ifndef KEXEC_ARCH | ||
#error KEXEC_ARCH not defined | ||
#endif | ||
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/* | ||
* This structure is used to hold the arguments that are used when loading | ||
* kernel binaries. | ||
*/ | ||
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typedef unsigned long kimage_entry_t; | ||
#define IND_DESTINATION 0x1 | ||
#define IND_INDIRECTION 0x2 | ||
#define IND_DONE 0x4 | ||
#define IND_SOURCE 0x8 | ||
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#define KEXEC_SEGMENT_MAX 8 | ||
struct kexec_segment { | ||
void __user *buf; | ||
size_t bufsz; | ||
unsigned long mem; /* User space sees this as a (void *) ... */ | ||
size_t memsz; | ||
}; | ||
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#ifdef CONFIG_COMPAT | ||
struct compat_kexec_segment { | ||
compat_uptr_t buf; | ||
compat_size_t bufsz; | ||
compat_ulong_t mem; /* User space sees this as a (void *) ... */ | ||
compat_size_t memsz; | ||
}; | ||
#endif | ||
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struct kimage { | ||
kimage_entry_t head; | ||
kimage_entry_t *entry; | ||
kimage_entry_t *last_entry; | ||
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unsigned long destination; | ||
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unsigned long start; | ||
struct page *control_code_page; | ||
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unsigned long nr_segments; | ||
struct kexec_segment segment[KEXEC_SEGMENT_MAX]; | ||
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struct list_head control_pages; | ||
struct list_head dest_pages; | ||
struct list_head unuseable_pages; | ||
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/* Address of next control page to allocate for crash kernels. */ | ||
unsigned long control_page; | ||
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/* Flags to indicate special processing */ | ||
unsigned int type : 1; | ||
#define KEXEC_TYPE_DEFAULT 0 | ||
#define KEXEC_TYPE_CRASH 1 | ||
}; | ||
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/* kexec interface functions */ | ||
extern NORET_TYPE void machine_kexec(struct kimage *image) ATTRIB_NORET; | ||
extern int machine_kexec_prepare(struct kimage *image); | ||
extern void machine_kexec_cleanup(struct kimage *image); | ||
extern asmlinkage long sys_kexec_load(unsigned long entry, | ||
unsigned long nr_segments, struct kexec_segment __user *segments, | ||
unsigned long flags); | ||
#ifdef CONFIG_COMPAT | ||
extern asmlinkage long compat_sys_kexec_load(unsigned long entry, | ||
unsigned long nr_segments, struct compat_kexec_segment __user *segments, | ||
unsigned long flags); | ||
#endif | ||
extern struct page *kimage_alloc_control_pages(struct kimage *image, unsigned int order); | ||
extern void crash_kexec(void); | ||
extern struct kimage *kexec_image; | ||
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#define KEXEC_ON_CRASH 0x00000001 | ||
#define KEXEC_ARCH_MASK 0xffff0000 | ||
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/* These values match the ELF architecture values. | ||
* Unless there is a good reason that should continue to be the case. | ||
*/ | ||
#define KEXEC_ARCH_DEFAULT ( 0 << 16) | ||
#define KEXEC_ARCH_386 ( 3 << 16) | ||
#define KEXEC_ARCH_X86_64 (62 << 16) | ||
#define KEXEC_ARCH_PPC (20 << 16) | ||
#define KEXEC_ARCH_PPC64 (21 << 16) | ||
#define KEXEC_ARCH_IA_64 (50 << 16) | ||
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#define KEXEC_FLAGS (KEXEC_ON_CRASH) /* List of defined/legal kexec flags */ | ||
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/* Location of a reserved region to hold the crash kernel. | ||
*/ | ||
extern struct resource crashk_res; | ||
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#else /* !CONFIG_KEXEC */ | ||
static inline void crash_kexec(void) { } | ||
#endif /* CONFIG_KEXEC */ | ||
#endif /* LINUX_KEXEC_H */ |
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