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1965aae3 PA |
1 | #ifndef _ASM_X86_KEXEC_H |
2 | #define _ASM_X86_KEXEC_H | |
3c233d13 | 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 | |
9868ee63 HY |
8 | # define PA_SWAP_PAGE 3 |
9 | # define PAGES_NR 4 | |
96a388de | 10 | #else |
3c233d13 | 11 | # define PA_CONTROL_PAGE 0 |
fee7b0d8 HY |
12 | # define VA_CONTROL_PAGE 1 |
13 | # define PA_TABLE_PAGE 2 | |
14 | # define PA_SWAP_PAGE 3 | |
15 | # define PAGES_NR 4 | |
96a388de | 16 | #endif |
3c233d13 | 17 | |
fb45daa6 | 18 | # define KEXEC_CONTROL_CODE_MAX_SIZE 2048 |
fb45daa6 | 19 | |
3c233d13 HH |
20 | #ifndef __ASSEMBLY__ |
21 | ||
22 | #include <linux/string.h> | |
23 | ||
24 | #include <asm/page.h> | |
25 | #include <asm/ptrace.h> | |
27f48d3e | 26 | #include <asm/bootparam.h> |
3c233d13 | 27 | |
dd5f7260 VG |
28 | struct kimage; |
29 | ||
3c233d13 HH |
30 | /* |
31 | * KEXEC_SOURCE_MEMORY_LIMIT maximum page get_free_page can return. | |
32 | * I.e. Maximum page that is mapped directly into kernel memory, | |
33 | * and kmap is not required. | |
34 | * | |
35 | * So far x86_64 is limited to 40 physical address bits. | |
36 | */ | |
37 | #ifdef CONFIG_X86_32 | |
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 | ||
163f6876 | 45 | # define KEXEC_CONTROL_PAGE_SIZE 4096 |
3c233d13 HH |
46 | |
47 | /* The native architecture */ | |
48 | # define KEXEC_ARCH KEXEC_ARCH_386 | |
49 | ||
50 | /* We can also handle crash dumps from 64 bit kernel. */ | |
51 | # define vmcore_elf_check_arch_cross(x) ((x)->e_machine == EM_X86_64) | |
52 | #else | |
53 | /* Maximum physical address we can use pages from */ | |
577af55d | 54 | # define KEXEC_SOURCE_MEMORY_LIMIT (MAXMEM-1) |
3c233d13 | 55 | /* Maximum address we can reach in physical address mode */ |
577af55d | 56 | # define KEXEC_DESTINATION_MEMORY_LIMIT (MAXMEM-1) |
3c233d13 | 57 | /* Maximum address we can use for the control pages */ |
577af55d | 58 | # define KEXEC_CONTROL_MEMORY_LIMIT (MAXMEM-1) |
3c233d13 HH |
59 | |
60 | /* Allocate one page for the pdp and the second for the code */ | |
163f6876 | 61 | # define KEXEC_CONTROL_PAGE_SIZE (4096UL + 4096UL) |
3c233d13 HH |
62 | |
63 | /* The native architecture */ | |
64 | # define KEXEC_ARCH KEXEC_ARCH_X86_64 | |
65 | #endif | |
66 | ||
dd5f7260 VG |
67 | /* Memory to backup during crash kdump */ |
68 | #define KEXEC_BACKUP_SRC_START (0UL) | |
69 | #define KEXEC_BACKUP_SRC_END (640 * 1024UL) /* 640K */ | |
70 | ||
3c233d13 HH |
71 | /* |
72 | * CPU does not save ss and sp on stack if execution is already | |
73 | * running in kernel mode at the time of NMI occurrence. This code | |
74 | * fixes it. | |
75 | */ | |
76 | static inline void crash_fixup_ss_esp(struct pt_regs *newregs, | |
77 | struct pt_regs *oldregs) | |
78 | { | |
79 | #ifdef CONFIG_X86_32 | |
80 | newregs->sp = (unsigned long)&(oldregs->sp); | |
b69a3f9d JP |
81 | asm volatile("xorl %%eax, %%eax\n\t" |
82 | "movw %%ss, %%ax\n\t" | |
83 | :"=a"(newregs->ss)); | |
3c233d13 HH |
84 | #endif |
85 | } | |
86 | ||
87 | /* | |
88 | * This function is responsible for capturing register states if coming | |
89 | * via panic otherwise just fix up the ss and sp if coming via kernel | |
90 | * mode exception. | |
91 | */ | |
92 | static inline void crash_setup_regs(struct pt_regs *newregs, | |
93 | struct pt_regs *oldregs) | |
94 | { | |
95 | if (oldregs) { | |
96 | memcpy(newregs, oldregs, sizeof(*newregs)); | |
97 | crash_fixup_ss_esp(newregs, oldregs); | |
98 | } else { | |
99 | #ifdef CONFIG_X86_32 | |
b69a3f9d JP |
100 | asm volatile("movl %%ebx,%0" : "=m"(newregs->bx)); |
101 | asm volatile("movl %%ecx,%0" : "=m"(newregs->cx)); | |
102 | asm volatile("movl %%edx,%0" : "=m"(newregs->dx)); | |
103 | asm volatile("movl %%esi,%0" : "=m"(newregs->si)); | |
104 | asm volatile("movl %%edi,%0" : "=m"(newregs->di)); | |
105 | asm volatile("movl %%ebp,%0" : "=m"(newregs->bp)); | |
106 | asm volatile("movl %%eax,%0" : "=m"(newregs->ax)); | |
107 | asm volatile("movl %%esp,%0" : "=m"(newregs->sp)); | |
108 | asm volatile("movl %%ss, %%eax;" :"=a"(newregs->ss)); | |
109 | asm volatile("movl %%cs, %%eax;" :"=a"(newregs->cs)); | |
110 | asm volatile("movl %%ds, %%eax;" :"=a"(newregs->ds)); | |
111 | asm volatile("movl %%es, %%eax;" :"=a"(newregs->es)); | |
112 | asm volatile("pushfl; popl %0" :"=m"(newregs->flags)); | |
3c233d13 | 113 | #else |
b69a3f9d JP |
114 | asm volatile("movq %%rbx,%0" : "=m"(newregs->bx)); |
115 | asm volatile("movq %%rcx,%0" : "=m"(newregs->cx)); | |
116 | asm volatile("movq %%rdx,%0" : "=m"(newregs->dx)); | |
117 | asm volatile("movq %%rsi,%0" : "=m"(newregs->si)); | |
118 | asm volatile("movq %%rdi,%0" : "=m"(newregs->di)); | |
119 | asm volatile("movq %%rbp,%0" : "=m"(newregs->bp)); | |
120 | asm volatile("movq %%rax,%0" : "=m"(newregs->ax)); | |
121 | asm volatile("movq %%rsp,%0" : "=m"(newregs->sp)); | |
122 | asm volatile("movq %%r8,%0" : "=m"(newregs->r8)); | |
123 | asm volatile("movq %%r9,%0" : "=m"(newregs->r9)); | |
124 | asm volatile("movq %%r10,%0" : "=m"(newregs->r10)); | |
125 | asm volatile("movq %%r11,%0" : "=m"(newregs->r11)); | |
126 | asm volatile("movq %%r12,%0" : "=m"(newregs->r12)); | |
127 | asm volatile("movq %%r13,%0" : "=m"(newregs->r13)); | |
128 | asm volatile("movq %%r14,%0" : "=m"(newregs->r14)); | |
129 | asm volatile("movq %%r15,%0" : "=m"(newregs->r15)); | |
130 | asm volatile("movl %%ss, %%eax;" :"=a"(newregs->ss)); | |
131 | asm volatile("movl %%cs, %%eax;" :"=a"(newregs->cs)); | |
132 | asm volatile("pushfq; popq %0" :"=m"(newregs->flags)); | |
3c233d13 HH |
133 | #endif |
134 | newregs->ip = (unsigned long)current_text_addr(); | |
135 | } | |
136 | } | |
137 | ||
138 | #ifdef CONFIG_X86_32 | |
3ab83521 | 139 | asmlinkage unsigned long |
3c233d13 HH |
140 | relocate_kernel(unsigned long indirection_page, |
141 | unsigned long control_page, | |
142 | unsigned long start_address, | |
3ab83521 HY |
143 | unsigned int has_pae, |
144 | unsigned int preserve_context); | |
3c233d13 | 145 | #else |
fee7b0d8 | 146 | unsigned long |
3c233d13 HH |
147 | relocate_kernel(unsigned long indirection_page, |
148 | unsigned long page_list, | |
fee7b0d8 HY |
149 | unsigned long start_address, |
150 | unsigned int preserve_context); | |
3c233d13 HH |
151 | #endif |
152 | ||
92be3d6b HY |
153 | #define ARCH_HAS_KIMAGE_ARCH |
154 | ||
f5deb796 | 155 | #ifdef CONFIG_X86_32 |
92be3d6b HY |
156 | struct kimage_arch { |
157 | pgd_t *pgd; | |
158 | #ifdef CONFIG_X86_PAE | |
159 | pmd_t *pmd0; | |
160 | pmd_t *pmd1; | |
161 | #endif | |
162 | pte_t *pte0; | |
163 | pte_t *pte1; | |
164 | }; | |
f5deb796 HY |
165 | #else |
166 | struct kimage_arch { | |
167 | pud_t *pud; | |
168 | pmd_t *pmd; | |
169 | pte_t *pte; | |
dd5f7260 VG |
170 | /* Details of backup region */ |
171 | unsigned long backup_src_start; | |
172 | unsigned long backup_src_sz; | |
173 | ||
174 | /* Physical address of backup segment */ | |
175 | unsigned long backup_load_addr; | |
176 | ||
177 | /* Core ELF header buffer */ | |
178 | void *elf_headers; | |
179 | unsigned long elf_headers_sz; | |
180 | unsigned long elf_load_addr; | |
f5deb796 | 181 | }; |
dd5f7260 | 182 | #endif /* CONFIG_X86_32 */ |
27f48d3e | 183 | |
dd5f7260 VG |
184 | #ifdef CONFIG_X86_64 |
185 | /* | |
186 | * Number of elements and order of elements in this structure should match | |
187 | * with the ones in arch/x86/purgatory/entry64.S. If you make a change here | |
188 | * make an appropriate change in purgatory too. | |
189 | */ | |
27f48d3e VG |
190 | struct kexec_entry64_regs { |
191 | uint64_t rax; | |
27f48d3e VG |
192 | uint64_t rcx; |
193 | uint64_t rdx; | |
dd5f7260 | 194 | uint64_t rbx; |
27f48d3e VG |
195 | uint64_t rsp; |
196 | uint64_t rbp; | |
dd5f7260 VG |
197 | uint64_t rsi; |
198 | uint64_t rdi; | |
27f48d3e VG |
199 | uint64_t r8; |
200 | uint64_t r9; | |
201 | uint64_t r10; | |
202 | uint64_t r11; | |
203 | uint64_t r12; | |
204 | uint64_t r13; | |
205 | uint64_t r14; | |
206 | uint64_t r15; | |
207 | uint64_t rip; | |
208 | }; | |
92be3d6b HY |
209 | #endif |
210 | ||
0ca0d818 ZY |
211 | typedef void crash_vmclear_fn(void); |
212 | extern crash_vmclear_fn __rcu *crash_vmclear_loaded_vmcss; | |
f23d1f4a | 213 | |
3c233d13 HH |
214 | #endif /* __ASSEMBLY__ */ |
215 | ||
1965aae3 | 216 | #endif /* _ASM_X86_KEXEC_H */ |