1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_X86_KEXEC_H
3 #define _ASM_X86_KEXEC_H
4
5 #ifdef CONFIG_X86_32
6 # define PA_CONTROL_PAGE 0
7 # define VA_CONTROL_PAGE 1
8 # define PA_PGD 2
9 # define PA_SWAP_PAGE 3
10 # define PAGES_NR 4
11 #else
12 # define PA_CONTROL_PAGE 0
13 # define VA_CONTROL_PAGE 1
14 # define PA_TABLE_PAGE 2
15 # define PA_SWAP_PAGE 3
16 # define PAGES_NR 4
17 #endif
18
19 # define KEXEC_CONTROL_CODE_MAX_SIZE 2048
20
21 #ifndef __ASSEMBLY__
22
23 #include <linux/string.h>
24 #include <linux/kernel.h>
25
26 #include <asm/page.h>
27 #include <asm/ptrace.h>
28
29 struct kimage;
30
31 /*
32 * KEXEC_SOURCE_MEMORY_LIMIT maximum page get_free_page can return.
33 * I.e. Maximum page that is mapped directly into kernel memory,
34 * and kmap is not required.
35 *
36 * So far x86_64 is limited to 40 physical address bits.
37 */
38 #ifdef CONFIG_X86_32
39 /* Maximum physical address we can use pages from */
40 # define KEXEC_SOURCE_MEMORY_LIMIT (-1UL)
41 /* Maximum address we can reach in physical address mode */
42 # define KEXEC_DESTINATION_MEMORY_LIMIT (-1UL)
43 /* Maximum address we can use for the control code buffer */
44 # define KEXEC_CONTROL_MEMORY_LIMIT TASK_SIZE
45
46 # define KEXEC_CONTROL_PAGE_SIZE 4096
47
48 /* The native architecture */
49 # define KEXEC_ARCH KEXEC_ARCH_386
50
51 /* We can also handle crash dumps from 64 bit kernel. */
52 # define vmcore_elf_check_arch_cross(x) ((x)->e_machine == EM_X86_64)
53 #else
54 /* Maximum physical address we can use pages from */
55 # define KEXEC_SOURCE_MEMORY_LIMIT (MAXMEM-1)
56 /* Maximum address we can reach in physical address mode */
57 # define KEXEC_DESTINATION_MEMORY_LIMIT (MAXMEM-1)
58 /* Maximum address we can use for the control pages */
59 # define KEXEC_CONTROL_MEMORY_LIMIT (MAXMEM-1)
60
61 /* Allocate one page for the pdp and the second for the code */
62 # define KEXEC_CONTROL_PAGE_SIZE (4096UL + 4096UL)
63
64 /* The native architecture */
65 # define KEXEC_ARCH KEXEC_ARCH_X86_64
66 #endif
67
68 /*
69 * This function is responsible for capturing register states if coming
70 * via panic otherwise just fix up the ss and sp if coming via kernel
71 * mode exception.
72 */
73 static inline void crash_setup_regs(struct pt_regs *newregs,
74 struct pt_regs *oldregs)
75 {
76 if (oldregs) {
77 memcpy(newregs, oldregs, sizeof(*newregs));
78 } else {
79 #ifdef CONFIG_X86_32
80 asm volatile("movl %%ebx,%0" : "=m"(newregs->bx));
81 asm volatile("movl %%ecx,%0" : "=m"(newregs->cx));
82 asm volatile("movl %%edx,%0" : "=m"(newregs->dx));
83 asm volatile("movl %%esi,%0" : "=m"(newregs->si));
84 asm volatile("movl %%edi,%0" : "=m"(newregs->di));
85 asm volatile("movl %%ebp,%0" : "=m"(newregs->bp));
86 asm volatile("movl %%eax,%0" : "=m"(newregs->ax));
87 asm volatile("movl %%esp,%0" : "=m"(newregs->sp));
88 asm volatile("movl %%ss, %%eax;" :"=a"(newregs->ss));
89 asm volatile("movl %%cs, %%eax;" :"=a"(newregs->cs));
90 asm volatile("movl %%ds, %%eax;" :"=a"(newregs->ds));
91 asm volatile("movl %%es, %%eax;" :"=a"(newregs->es));
92 asm volatile("pushfl; popl %0" :"=m"(newregs->flags));
93 #else
94 asm volatile("movq %%rbx,%0" : "=m"(newregs->bx));
95 asm volatile("movq %%rcx,%0" : "=m"(newregs->cx));
96 asm volatile("movq %%rdx,%0" : "=m"(newregs->dx));
97 asm volatile("movq %%rsi,%0" : "=m"(newregs->si));
98 asm volatile("movq %%rdi,%0" : "=m"(newregs->di));
99 asm volatile("movq %%rbp,%0" : "=m"(newregs->bp));
100 asm volatile("movq %%rax,%0" : "=m"(newregs->ax));
101 asm volatile("movq %%rsp,%0" : "=m"(newregs->sp));
102 asm volatile("movq %%r8,%0" : "=m"(newregs->r8));
103 asm volatile("movq %%r9,%0" : "=m"(newregs->r9));
104 asm volatile("movq %%r10,%0" : "=m"(newregs->r10));
105 asm volatile("movq %%r11,%0" : "=m"(newregs->r11));
106 asm volatile("movq %%r12,%0" : "=m"(newregs->r12));
107 asm volatile("movq %%r13,%0" : "=m"(newregs->r13));
108 asm volatile("movq %%r14,%0" : "=m"(newregs->r14));
109 asm volatile("movq %%r15,%0" : "=m"(newregs->r15));
110 asm volatile("movl %%ss, %%eax;" :"=a"(newregs->ss));
111 asm volatile("movl %%cs, %%eax;" :"=a"(newregs->cs));
112 asm volatile("pushfq; popq %0" :"=m"(newregs->flags));
113 #endif
114 newregs->ip = _THIS_IP_;
115 }
116 }
117
118 #ifdef CONFIG_X86_32
119 asmlinkage unsigned long
120 relocate_kernel(unsigned long indirection_page,
121 unsigned long control_page,
122 unsigned long start_address,
123 unsigned int has_pae,
124 unsigned int preserve_context);
125 #else
126 unsigned long
127 relocate_kernel(unsigned long indirection_page,
128 unsigned long page_list,
129 unsigned long start_address,
130 unsigned int preserve_context,
131 unsigned int host_mem_enc_active);
132 #endif
133
134 #define ARCH_HAS_KIMAGE_ARCH
135
136 #ifdef CONFIG_X86_32
137 struct kimage_arch {
138 pgd_t *pgd;
139 #ifdef CONFIG_X86_PAE
140 pmd_t *pmd0;
141 pmd_t *pmd1;
142 #endif
143 pte_t *pte0;
144 pte_t *pte1;
145 };
146 #else
147 struct kimage_arch {
148 p4d_t *p4d;
149 pud_t *pud;
150 pmd_t *pmd;
151 pte_t *pte;
152 };
153 #endif /* CONFIG_X86_32 */
154
155 #ifdef CONFIG_X86_64
156 /*
157 * Number of elements and order of elements in this structure should match
158 * with the ones in arch/x86/purgatory/entry64.S. If you make a change here
159 * make an appropriate change in purgatory too.
160 */
161 struct kexec_entry64_regs {
162 uint64_t rax;
163 uint64_t rcx;
164 uint64_t rdx;
165 uint64_t rbx;
166 uint64_t rsp;
167 uint64_t rbp;
168 uint64_t rsi;
169 uint64_t rdi;
170 uint64_t r8;
171 uint64_t r9;
172 uint64_t r10;
173 uint64_t r11;
174 uint64_t r12;
175 uint64_t r13;
176 uint64_t r14;
177 uint64_t r15;
178 uint64_t rip;
179 };
180
181 extern int arch_kexec_post_alloc_pages(void *vaddr, unsigned int pages,
182 gfp_t gfp);
183 #define arch_kexec_post_alloc_pages arch_kexec_post_alloc_pages
184
185 extern void arch_kexec_pre_free_pages(void *vaddr, unsigned int pages);
186 #define arch_kexec_pre_free_pages arch_kexec_pre_free_pages
187
188 void arch_kexec_protect_crashkres(void);
189 #define arch_kexec_protect_crashkres arch_kexec_protect_crashkres
190
191 void arch_kexec_unprotect_crashkres(void);
192 #define arch_kexec_unprotect_crashkres arch_kexec_unprotect_crashkres
193
194 #ifdef CONFIG_KEXEC_FILE
195 struct purgatory_info;
196 int arch_kexec_apply_relocations_add(struct purgatory_info *pi,
197 Elf_Shdr *section,
198 const Elf_Shdr *relsec,
199 const Elf_Shdr *symtab);
200 #define arch_kexec_apply_relocations_add arch_kexec_apply_relocations_add
201
202 int arch_kimage_file_post_load_cleanup(struct kimage *image);
203 #define arch_kimage_file_post_load_cleanup arch_kimage_file_post_load_cleanup
204 #endif
205 #endif
206
207 extern void kdump_nmi_shootdown_cpus(void);
208
209 #ifdef CONFIG_CRASH_HOTPLUG
210 void arch_crash_handle_hotplug_event(struct kimage *image, void *arg);
211 #define arch_crash_handle_hotplug_event arch_crash_handle_hotplug_event
212
213 int arch_crash_hotplug_support(struct kimage *image, unsigned long kexec_flags);
214 #define arch_crash_hotplug_support arch_crash_hotplug_support
215
216 unsigned int arch_crash_get_elfcorehdr_size(void);
217 #define crash_get_elfcorehdr_size arch_crash_get_elfcorehdr_size
218 #endif
219
220 #endif /* __ASSEMBLY__ */
221
222 #endif /* _ASM_X86_KEXEC_H */
223
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