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Eric W. Biederman5033cba2005-06-25 14:57:56 -07001#ifndef _I386_KEXEC_H
2#define _I386_KEXEC_H
3
Magnus Damm35665612006-09-26 10:52:38 +02004#define PA_CONTROL_PAGE 0
5#define VA_CONTROL_PAGE 1
6#define PA_PGD 2
7#define VA_PGD 3
8#define PA_PTE_0 4
9#define VA_PTE_0 5
10#define PA_PTE_1 6
11#define VA_PTE_1 7
12#ifdef CONFIG_X86_PAE
13#define PA_PMD_0 8
14#define VA_PMD_0 9
15#define PA_PMD_1 10
16#define VA_PMD_1 11
17#define PAGES_NR 12
18#else
19#define PAGES_NR 8
20#endif
21
22#ifndef __ASSEMBLY__
23
Eric W. Biederman5033cba2005-06-25 14:57:56 -070024#include <asm/fixmap.h>
Vivek Goyale996e582006-01-09 20:51:44 -080025#include <asm/ptrace.h>
Vivek Goyalf05b6902006-01-09 20:51:44 -080026#include <asm/string.h>
Eric W. Biederman5033cba2005-06-25 14:57:56 -070027
28/*
29 * KEXEC_SOURCE_MEMORY_LIMIT maximum page get_free_page can return.
30 * I.e. Maximum page that is mapped directly into kernel memory,
31 * and kmap is not required.
32 *
33 * Someone correct me if FIXADDR_START - PAGEOFFSET is not the correct
34 * calculation for the amount of memory directly mappable into the
35 * kernel memory space.
36 */
37
38/* Maximum physical address we can use pages from */
39#define KEXEC_SOURCE_MEMORY_LIMIT (-1UL)
40/* Maximum address we can reach in physical address mode */
41#define KEXEC_DESTINATION_MEMORY_LIMIT (-1UL)
42/* Maximum address we can use for the control code buffer */
43#define KEXEC_CONTROL_MEMORY_LIMIT TASK_SIZE
44
45#define KEXEC_CONTROL_CODE_SIZE 4096
46
47/* The native architecture */
48#define KEXEC_ARCH KEXEC_ARCH_386
49
Vivek Goyal625f1c822005-06-25 14:58:12 -070050#define MAX_NOTE_BYTES 1024
Vivek Goyal625f1c822005-06-25 14:58:12 -070051
Vivek Goyale996e582006-01-09 20:51:44 -080052/* CPU does not save ss and esp on stack if execution is already
53 * running in kernel mode at the time of NMI occurrence. This code
54 * fixes it.
55 */
56static inline void crash_fixup_ss_esp(struct pt_regs *newregs,
57 struct pt_regs *oldregs)
58{
59 memcpy(newregs, oldregs, sizeof(*newregs));
60 newregs->esp = (unsigned long)&(oldregs->esp);
61 __asm__ __volatile__(
62 "xorl %%eax, %%eax\n\t"
63 "movw %%ss, %%ax\n\t"
64 :"=a"(newregs->xss));
65}
66
67/*
68 * This function is responsible for capturing register states if coming
69 * via panic otherwise just fix up the ss and esp if coming via kernel
70 * mode exception.
71 */
72static inline void crash_setup_regs(struct pt_regs *newregs,
73 struct pt_regs *oldregs)
74{
75 if (oldregs)
76 crash_fixup_ss_esp(newregs, oldregs);
77 else {
78 __asm__ __volatile__("movl %%ebx,%0" : "=m"(newregs->ebx));
79 __asm__ __volatile__("movl %%ecx,%0" : "=m"(newregs->ecx));
80 __asm__ __volatile__("movl %%edx,%0" : "=m"(newregs->edx));
81 __asm__ __volatile__("movl %%esi,%0" : "=m"(newregs->esi));
82 __asm__ __volatile__("movl %%edi,%0" : "=m"(newregs->edi));
83 __asm__ __volatile__("movl %%ebp,%0" : "=m"(newregs->ebp));
84 __asm__ __volatile__("movl %%eax,%0" : "=m"(newregs->eax));
85 __asm__ __volatile__("movl %%esp,%0" : "=m"(newregs->esp));
86 __asm__ __volatile__("movw %%ss, %%ax;" :"=a"(newregs->xss));
87 __asm__ __volatile__("movw %%cs, %%ax;" :"=a"(newregs->xcs));
88 __asm__ __volatile__("movw %%ds, %%ax;" :"=a"(newregs->xds));
89 __asm__ __volatile__("movw %%es, %%ax;" :"=a"(newregs->xes));
90 __asm__ __volatile__("pushfl; popl %0" :"=m"(newregs->eflags));
91
92 newregs->eip = (unsigned long)current_text_addr();
93 }
94}
Magnus Damm35665612006-09-26 10:52:38 +020095asmlinkage NORET_TYPE void
96relocate_kernel(unsigned long indirection_page,
97 unsigned long control_page,
98 unsigned long start_address,
99 unsigned int has_pae) ATTRIB_NORET;
100
101#endif /* __ASSEMBLY__ */
Vivek Goyale996e582006-01-09 20:51:44 -0800102
Eric W. Biederman5033cba2005-06-25 14:57:56 -0700103#endif /* _I386_KEXEC_H */