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Eric W. Biederman5033cba2005-06-25 14:57:56 -07001#ifndef _I386_KEXEC_H
2#define _I386_KEXEC_H
3
4#include <asm/fixmap.h>
Vivek Goyale996e582006-01-09 20:51:44 -08005#include <asm/ptrace.h>
Vivek Goyalf05b6902006-01-09 20:51:44 -08006#include <asm/string.h>
Eric W. Biederman5033cba2005-06-25 14:57:56 -07007
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
Vivek Goyal625f1c82005-06-25 14:58:12 -070030#define MAX_NOTE_BYTES 1024
Vivek Goyal625f1c82005-06-25 14:58:12 -070031
Vivek Goyale996e582006-01-09 20:51:44 -080032/* 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 */
36static 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 */
52static 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
Eric W. Biederman5033cba2005-06-25 14:57:56 -070076#endif /* _I386_KEXEC_H */