4 #include <asm/fixmap.h>
5 #include <asm/ptrace.h>
6 #include <asm/string.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 * Someone correct me if FIXADDR_START - PAGEOFFSET is not the correct
14 * calculation for the amount of memory directly mappable into the
15 * kernel memory space.
18 /* Maximum physical address we can use pages from */
19 #define KEXEC_SOURCE_MEMORY_LIMIT (-1UL)
20 /* Maximum address we can reach in physical address mode */
21 #define KEXEC_DESTINATION_MEMORY_LIMIT (-1UL)
22 /* Maximum address we can use for the control code buffer */
23 #define KEXEC_CONTROL_MEMORY_LIMIT TASK_SIZE
25 #define KEXEC_CONTROL_CODE_SIZE 4096
27 /* The native architecture */
28 #define KEXEC_ARCH KEXEC_ARCH_386
30 #define MAX_NOTE_BYTES 1024
32 /* CPU does not save ss and esp on stack if execution is already
33 * running in kernel mode at the time of NMI occurrence. This code
36 static inline void crash_fixup_ss_esp(struct pt_regs
*newregs
,
37 struct pt_regs
*oldregs
)
39 memcpy(newregs
, oldregs
, sizeof(*newregs
));
40 newregs
->esp
= (unsigned long)&(oldregs
->esp
);
42 "xorl %%eax, %%eax\n\t"
48 * This function is responsible for capturing register states if coming
49 * via panic otherwise just fix up the ss and esp if coming via kernel
52 static inline void crash_setup_regs(struct pt_regs
*newregs
,
53 struct pt_regs
*oldregs
)
56 crash_fixup_ss_esp(newregs
, oldregs
);
58 __asm__
__volatile__("movl %%ebx,%0" : "=m"(newregs
->ebx
));
59 __asm__
__volatile__("movl %%ecx,%0" : "=m"(newregs
->ecx
));
60 __asm__
__volatile__("movl %%edx,%0" : "=m"(newregs
->edx
));
61 __asm__
__volatile__("movl %%esi,%0" : "=m"(newregs
->esi
));
62 __asm__
__volatile__("movl %%edi,%0" : "=m"(newregs
->edi
));
63 __asm__
__volatile__("movl %%ebp,%0" : "=m"(newregs
->ebp
));
64 __asm__
__volatile__("movl %%eax,%0" : "=m"(newregs
->eax
));
65 __asm__
__volatile__("movl %%esp,%0" : "=m"(newregs
->esp
));
66 __asm__
__volatile__("movw %%ss, %%ax;" :"=a"(newregs
->xss
));
67 __asm__
__volatile__("movw %%cs, %%ax;" :"=a"(newregs
->xcs
));
68 __asm__
__volatile__("movw %%ds, %%ax;" :"=a"(newregs
->xds
));
69 __asm__
__volatile__("movw %%es, %%ax;" :"=a"(newregs
->xes
));
70 __asm__
__volatile__("pushfl; popl %0" :"=m"(newregs
->eflags
));
72 newregs
->eip
= (unsigned long)current_text_addr();
76 #endif /* _I386_KEXEC_H */