1#ifndef _I386_KEXEC_H
2#define _I386_KEXEC_H
3
4#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
24#include <asm/ptrace.h>
25#include <asm/string.h>
26
27/*
28 * KEXEC_SOURCE_MEMORY_LIMIT maximum page get_free_page can return.
29 * I.e. Maximum page that is mapped directly into kernel memory,
30 * and kmap is not required.
31 */
32
33/* Maximum physical address we can use pages from */
34#define KEXEC_SOURCE_MEMORY_LIMIT (-1UL)
35/* Maximum address we can reach in physical address mode */
36#define KEXEC_DESTINATION_MEMORY_LIMIT (-1UL)
37/* Maximum address we can use for the control code buffer */
38#define KEXEC_CONTROL_MEMORY_LIMIT TASK_SIZE
39
40#define KEXEC_CONTROL_CODE_SIZE	4096
41
42/* The native architecture */
43#define KEXEC_ARCH KEXEC_ARCH_386
44
45/* We can also handle crash dumps from 64 bit kernel. */
46#define vmcore_elf_check_arch_cross(x) ((x)->e_machine == EM_X86_64)
47
48/* CPU does not save ss and esp on stack if execution is already
49 * running in kernel mode at the time of NMI occurrence. This code
50 * fixes it.
51 */
52static inline void crash_fixup_ss_esp(struct pt_regs *newregs,
53					struct pt_regs *oldregs)
54{
55	memcpy(newregs, oldregs, sizeof(*newregs));
56	newregs->esp = (unsigned long)&(oldregs->esp);
57	__asm__ __volatile__(
58			"xorl %%eax, %%eax\n\t"
59			"movw %%ss, %%ax\n\t"
60			:"=a"(newregs->xss));
61}
62
63/*
64 * This function is responsible for capturing register states if coming
65 * via panic otherwise just fix up the ss and esp if coming via kernel
66 * mode exception.
67 */
68static inline void crash_setup_regs(struct pt_regs *newregs,
69                                       struct pt_regs *oldregs)
70{
71       if (oldregs)
72               crash_fixup_ss_esp(newregs, oldregs);
73       else {
74               __asm__ __volatile__("movl %%ebx,%0" : "=m"(newregs->ebx));
75               __asm__ __volatile__("movl %%ecx,%0" : "=m"(newregs->ecx));
76               __asm__ __volatile__("movl %%edx,%0" : "=m"(newregs->edx));
77               __asm__ __volatile__("movl %%esi,%0" : "=m"(newregs->esi));
78               __asm__ __volatile__("movl %%edi,%0" : "=m"(newregs->edi));
79               __asm__ __volatile__("movl %%ebp,%0" : "=m"(newregs->ebp));
80               __asm__ __volatile__("movl %%eax,%0" : "=m"(newregs->eax));
81               __asm__ __volatile__("movl %%esp,%0" : "=m"(newregs->esp));
82               __asm__ __volatile__("movw %%ss, %%ax;" :"=a"(newregs->xss));
83               __asm__ __volatile__("movw %%cs, %%ax;" :"=a"(newregs->xcs));
84               __asm__ __volatile__("movw %%ds, %%ax;" :"=a"(newregs->xds));
85               __asm__ __volatile__("movw %%es, %%ax;" :"=a"(newregs->xes));
86               __asm__ __volatile__("pushfl; popl %0" :"=m"(newregs->eflags));
87
88               newregs->eip = (unsigned long)current_text_addr();
89       }
90}
91asmlinkage NORET_TYPE void
92relocate_kernel(unsigned long indirection_page,
93		unsigned long control_page,
94		unsigned long start_address,
95		unsigned int has_pae) ATTRIB_NORET;
96
97#endif /* __ASSEMBLY__ */
98
99#endif /* _I386_KEXEC_H */
100