1 #ifndef _X86_64_KEXEC_H
2 #define _X86_64_KEXEC_H
6 #include <asm/ptrace.h>
9 * KEXEC_SOURCE_MEMORY_LIMIT maximum page get_free_page can return.
10 * I.e. Maximum page that is mapped directly into kernel memory,
11 * and kmap is not required.
13 * So far x86_64 is limited to 40 physical address bits.
16 /* Maximum physical address we can use pages from */
17 #define KEXEC_SOURCE_MEMORY_LIMIT (0xFFFFFFFFFFUL)
18 /* Maximum address we can reach in physical address mode */
19 #define KEXEC_DESTINATION_MEMORY_LIMIT (0xFFFFFFFFFFUL)
20 /* Maximum address we can use for the control pages */
21 #define KEXEC_CONTROL_MEMORY_LIMIT (0xFFFFFFFFFFUL)
23 /* Allocate one page for the pdp and the second for the code */
24 #define KEXEC_CONTROL_CODE_SIZE (4096UL + 4096UL)
26 /* The native architecture */
27 #define KEXEC_ARCH KEXEC_ARCH_X86_64
29 #define MAX_NOTE_BYTES 1024
32 * Saving the registers of the cpu on which panic occured in
33 * crash_kexec to save a valid sp. The registers of other cpus
34 * will be saved in machine_crash_shutdown while shooting down them.
37 static inline void crash_setup_regs(struct pt_regs
*newregs
,
38 struct pt_regs
*oldregs
)
41 memcpy(newregs
, oldregs
, sizeof(*newregs
));
43 __asm__
__volatile__("movq %%rbx,%0" : "=m"(newregs
->rbx
));
44 __asm__
__volatile__("movq %%rcx,%0" : "=m"(newregs
->rcx
));
45 __asm__
__volatile__("movq %%rdx,%0" : "=m"(newregs
->rdx
));
46 __asm__
__volatile__("movq %%rsi,%0" : "=m"(newregs
->rsi
));
47 __asm__
__volatile__("movq %%rdi,%0" : "=m"(newregs
->rdi
));
48 __asm__
__volatile__("movq %%rbp,%0" : "=m"(newregs
->rbp
));
49 __asm__
__volatile__("movq %%rax,%0" : "=m"(newregs
->rax
));
50 __asm__
__volatile__("movq %%rsp,%0" : "=m"(newregs
->rsp
));
51 __asm__
__volatile__("movq %%r8,%0" : "=m"(newregs
->r8
));
52 __asm__
__volatile__("movq %%r9,%0" : "=m"(newregs
->r9
));
53 __asm__
__volatile__("movq %%r10,%0" : "=m"(newregs
->r10
));
54 __asm__
__volatile__("movq %%r11,%0" : "=m"(newregs
->r11
));
55 __asm__
__volatile__("movq %%r12,%0" : "=m"(newregs
->r12
));
56 __asm__
__volatile__("movq %%r13,%0" : "=m"(newregs
->r13
));
57 __asm__
__volatile__("movq %%r14,%0" : "=m"(newregs
->r14
));
58 __asm__
__volatile__("movq %%r15,%0" : "=m"(newregs
->r15
));
59 __asm__
__volatile__("movl %%ss, %%eax;" :"=a"(newregs
->ss
));
60 __asm__
__volatile__("movl %%cs, %%eax;" :"=a"(newregs
->cs
));
61 __asm__
__volatile__("pushfq; popq %0" :"=m"(newregs
->eflags
));
63 newregs
->rip
= (unsigned long)current_text_addr();
66 #endif /* _X86_64_KEXEC_H */