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3c233d13 HH |
1 | #ifndef _KEXEC_H |
2 | #define _KEXEC_H | |
3 | ||
96a388de | 4 | #ifdef CONFIG_X86_32 |
3c233d13 HH |
5 | # define PA_CONTROL_PAGE 0 |
6 | # define VA_CONTROL_PAGE 1 | |
7 | # define PA_PGD 2 | |
8 | # define VA_PGD 3 | |
9 | # define PA_PTE_0 4 | |
10 | # define VA_PTE_0 5 | |
11 | # define PA_PTE_1 6 | |
12 | # define VA_PTE_1 7 | |
13 | # ifdef CONFIG_X86_PAE | |
14 | # define PA_PMD_0 8 | |
15 | # define VA_PMD_0 9 | |
16 | # define PA_PMD_1 10 | |
17 | # define VA_PMD_1 11 | |
18 | # define PAGES_NR 12 | |
19 | # else | |
20 | # define PAGES_NR 8 | |
21 | # endif | |
96a388de | 22 | #else |
3c233d13 HH |
23 | # define PA_CONTROL_PAGE 0 |
24 | # define VA_CONTROL_PAGE 1 | |
25 | # define PA_PGD 2 | |
26 | # define VA_PGD 3 | |
27 | # define PA_PUD_0 4 | |
28 | # define VA_PUD_0 5 | |
29 | # define PA_PMD_0 6 | |
30 | # define VA_PMD_0 7 | |
31 | # define PA_PTE_0 8 | |
32 | # define VA_PTE_0 9 | |
33 | # define PA_PUD_1 10 | |
34 | # define VA_PUD_1 11 | |
35 | # define PA_PMD_1 12 | |
36 | # define VA_PMD_1 13 | |
37 | # define PA_PTE_1 14 | |
38 | # define VA_PTE_1 15 | |
39 | # define PA_TABLE_PAGE 16 | |
40 | # define PAGES_NR 17 | |
96a388de | 41 | #endif |
3c233d13 HH |
42 | |
43 | #ifndef __ASSEMBLY__ | |
44 | ||
45 | #include <linux/string.h> | |
46 | ||
47 | #include <asm/page.h> | |
48 | #include <asm/ptrace.h> | |
49 | ||
50 | /* | |
51 | * KEXEC_SOURCE_MEMORY_LIMIT maximum page get_free_page can return. | |
52 | * I.e. Maximum page that is mapped directly into kernel memory, | |
53 | * and kmap is not required. | |
54 | * | |
55 | * So far x86_64 is limited to 40 physical address bits. | |
56 | */ | |
57 | #ifdef CONFIG_X86_32 | |
58 | /* Maximum physical address we can use pages from */ | |
59 | # define KEXEC_SOURCE_MEMORY_LIMIT (-1UL) | |
60 | /* Maximum address we can reach in physical address mode */ | |
61 | # define KEXEC_DESTINATION_MEMORY_LIMIT (-1UL) | |
62 | /* Maximum address we can use for the control code buffer */ | |
63 | # define KEXEC_CONTROL_MEMORY_LIMIT TASK_SIZE | |
64 | ||
65 | # define KEXEC_CONTROL_CODE_SIZE 4096 | |
66 | ||
67 | /* The native architecture */ | |
68 | # define KEXEC_ARCH KEXEC_ARCH_386 | |
69 | ||
70 | /* We can also handle crash dumps from 64 bit kernel. */ | |
71 | # define vmcore_elf_check_arch_cross(x) ((x)->e_machine == EM_X86_64) | |
72 | #else | |
73 | /* Maximum physical address we can use pages from */ | |
74 | # define KEXEC_SOURCE_MEMORY_LIMIT (0xFFFFFFFFFFUL) | |
75 | /* Maximum address we can reach in physical address mode */ | |
76 | # define KEXEC_DESTINATION_MEMORY_LIMIT (0xFFFFFFFFFFUL) | |
77 | /* Maximum address we can use for the control pages */ | |
78 | # define KEXEC_CONTROL_MEMORY_LIMIT (0xFFFFFFFFFFUL) | |
79 | ||
80 | /* Allocate one page for the pdp and the second for the code */ | |
81 | # define KEXEC_CONTROL_CODE_SIZE (4096UL + 4096UL) | |
82 | ||
83 | /* The native architecture */ | |
84 | # define KEXEC_ARCH KEXEC_ARCH_X86_64 | |
85 | #endif | |
86 | ||
87 | /* | |
88 | * CPU does not save ss and sp on stack if execution is already | |
89 | * running in kernel mode at the time of NMI occurrence. This code | |
90 | * fixes it. | |
91 | */ | |
92 | static inline void crash_fixup_ss_esp(struct pt_regs *newregs, | |
93 | struct pt_regs *oldregs) | |
94 | { | |
95 | #ifdef CONFIG_X86_32 | |
96 | newregs->sp = (unsigned long)&(oldregs->sp); | |
b69a3f9d JP |
97 | asm volatile("xorl %%eax, %%eax\n\t" |
98 | "movw %%ss, %%ax\n\t" | |
99 | :"=a"(newregs->ss)); | |
3c233d13 HH |
100 | #endif |
101 | } | |
102 | ||
103 | /* | |
104 | * This function is responsible for capturing register states if coming | |
105 | * via panic otherwise just fix up the ss and sp if coming via kernel | |
106 | * mode exception. | |
107 | */ | |
108 | static inline void crash_setup_regs(struct pt_regs *newregs, | |
109 | struct pt_regs *oldregs) | |
110 | { | |
111 | if (oldregs) { | |
112 | memcpy(newregs, oldregs, sizeof(*newregs)); | |
113 | crash_fixup_ss_esp(newregs, oldregs); | |
114 | } else { | |
115 | #ifdef CONFIG_X86_32 | |
b69a3f9d JP |
116 | asm volatile("movl %%ebx,%0" : "=m"(newregs->bx)); |
117 | asm volatile("movl %%ecx,%0" : "=m"(newregs->cx)); | |
118 | asm volatile("movl %%edx,%0" : "=m"(newregs->dx)); | |
119 | asm volatile("movl %%esi,%0" : "=m"(newregs->si)); | |
120 | asm volatile("movl %%edi,%0" : "=m"(newregs->di)); | |
121 | asm volatile("movl %%ebp,%0" : "=m"(newregs->bp)); | |
122 | asm volatile("movl %%eax,%0" : "=m"(newregs->ax)); | |
123 | asm volatile("movl %%esp,%0" : "=m"(newregs->sp)); | |
124 | asm volatile("movl %%ss, %%eax;" :"=a"(newregs->ss)); | |
125 | asm volatile("movl %%cs, %%eax;" :"=a"(newregs->cs)); | |
126 | asm volatile("movl %%ds, %%eax;" :"=a"(newregs->ds)); | |
127 | asm volatile("movl %%es, %%eax;" :"=a"(newregs->es)); | |
128 | asm volatile("pushfl; popl %0" :"=m"(newregs->flags)); | |
3c233d13 | 129 | #else |
b69a3f9d JP |
130 | asm volatile("movq %%rbx,%0" : "=m"(newregs->bx)); |
131 | asm volatile("movq %%rcx,%0" : "=m"(newregs->cx)); | |
132 | asm volatile("movq %%rdx,%0" : "=m"(newregs->dx)); | |
133 | asm volatile("movq %%rsi,%0" : "=m"(newregs->si)); | |
134 | asm volatile("movq %%rdi,%0" : "=m"(newregs->di)); | |
135 | asm volatile("movq %%rbp,%0" : "=m"(newregs->bp)); | |
136 | asm volatile("movq %%rax,%0" : "=m"(newregs->ax)); | |
137 | asm volatile("movq %%rsp,%0" : "=m"(newregs->sp)); | |
138 | asm volatile("movq %%r8,%0" : "=m"(newregs->r8)); | |
139 | asm volatile("movq %%r9,%0" : "=m"(newregs->r9)); | |
140 | asm volatile("movq %%r10,%0" : "=m"(newregs->r10)); | |
141 | asm volatile("movq %%r11,%0" : "=m"(newregs->r11)); | |
142 | asm volatile("movq %%r12,%0" : "=m"(newregs->r12)); | |
143 | asm volatile("movq %%r13,%0" : "=m"(newregs->r13)); | |
144 | asm volatile("movq %%r14,%0" : "=m"(newregs->r14)); | |
145 | asm volatile("movq %%r15,%0" : "=m"(newregs->r15)); | |
146 | asm volatile("movl %%ss, %%eax;" :"=a"(newregs->ss)); | |
147 | asm volatile("movl %%cs, %%eax;" :"=a"(newregs->cs)); | |
148 | asm volatile("pushfq; popq %0" :"=m"(newregs->flags)); | |
3c233d13 HH |
149 | #endif |
150 | newregs->ip = (unsigned long)current_text_addr(); | |
151 | } | |
152 | } | |
153 | ||
154 | #ifdef CONFIG_X86_32 | |
155 | asmlinkage NORET_TYPE void | |
156 | relocate_kernel(unsigned long indirection_page, | |
157 | unsigned long control_page, | |
158 | unsigned long start_address, | |
159 | unsigned int has_pae) ATTRIB_NORET; | |
160 | #else | |
161 | NORET_TYPE void | |
162 | relocate_kernel(unsigned long indirection_page, | |
163 | unsigned long page_list, | |
164 | unsigned long start_address) ATTRIB_NORET; | |
165 | #endif | |
166 | ||
167 | #endif /* __ASSEMBLY__ */ | |
168 | ||
169 | #endif /* _KEXEC_H */ |