]>
Commit | Line | Data |
---|---|---|
5033cba0 EB |
1 | #ifndef _I386_KEXEC_H |
2 | #define _I386_KEXEC_H | |
3 | ||
4 | #include <asm/fixmap.h> | |
e996e581 | 5 | #include <asm/ptrace.h> |
f05b6902 | 6 | #include <asm/string.h> |
5033cba0 EB |
7 | |
8 | /* | |
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. | |
12 | * | |
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. | |
16 | */ | |
17 | ||
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 | |
24 | ||
25 | #define KEXEC_CONTROL_CODE_SIZE 4096 | |
26 | ||
27 | /* The native architecture */ | |
28 | #define KEXEC_ARCH KEXEC_ARCH_386 | |
29 | ||
625f1c82 | 30 | #define MAX_NOTE_BYTES 1024 |
625f1c82 | 31 | |
e996e581 VG |
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 | |
34 | * fixes it. | |
35 | */ | |
36 | static inline void crash_fixup_ss_esp(struct pt_regs *newregs, | |
37 | struct pt_regs *oldregs) | |
38 | { | |
39 | memcpy(newregs, oldregs, sizeof(*newregs)); | |
40 | newregs->esp = (unsigned long)&(oldregs->esp); | |
41 | __asm__ __volatile__( | |
42 | "xorl %%eax, %%eax\n\t" | |
43 | "movw %%ss, %%ax\n\t" | |
44 | :"=a"(newregs->xss)); | |
45 | } | |
46 | ||
47 | /* | |
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 | |
50 | * mode exception. | |
51 | */ | |
52 | static inline void crash_setup_regs(struct pt_regs *newregs, | |
53 | struct pt_regs *oldregs) | |
54 | { | |
55 | if (oldregs) | |
56 | crash_fixup_ss_esp(newregs, oldregs); | |
57 | else { | |
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)); | |
71 | ||
72 | newregs->eip = (unsigned long)current_text_addr(); | |
73 | } | |
74 | } | |
75 | ||
5033cba0 | 76 | #endif /* _I386_KEXEC_H */ |