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 #include <asm/bootparam.h>
29
30 struct kimage;
31
32 /*
33 * KEXEC_SOURCE_MEMORY_LIMIT maximum page get_free_page can return.
34 * I.e. Maximum page that is mapped directly into kernel memory,
35 * and kmap is not required.
36 *
37 * So far x86_64 is limited to 40 physical address bits.
38 */
39 #ifdef CONFIG_X86_32
40 /* Maximum physical address we can use pages from */
41 # define KEXEC_SOURCE_MEMORY_LIMIT (-1UL)
42 /* Maximum address we can reach in physical address mode */
43 # define KEXEC_DESTINATION_MEMORY_LIMIT (-1UL)
44 /* Maximum address we can use for the control code buffer */
45 # define KEXEC_CONTROL_MEMORY_LIMIT TASK_SIZE
46
47 # define KEXEC_CONTROL_PAGE_SIZE 4096
48
49 /* The native architecture */
50 # define KEXEC_ARCH KEXEC_ARCH_386
51
52 /* We can also handle crash dumps from 64 bit kernel. */
53 # define vmcore_elf_check_arch_cross(x) ((x)->e_machine == EM_X86_64)
54 #else
55 /* Maximum physical address we can use pages from */
56 # define KEXEC_SOURCE_MEMORY_LIMIT (MAXMEM-1)
57 /* Maximum address we can reach in physical address mode */
58 # define KEXEC_DESTINATION_MEMORY_LIMIT (MAXMEM-1)
59 /* Maximum address we can use for the control pages */
60 # define KEXEC_CONTROL_MEMORY_LIMIT (MAXMEM-1)
61
62 /* Allocate one page for the pdp and the second for the code */
63 # define KEXEC_CONTROL_PAGE_SIZE (4096UL + 4096UL)
64
65 /* The native architecture */
66 # define KEXEC_ARCH KEXEC_ARCH_X86_64
67 #endif
68
69 /*
70 * This function is responsible for capturing register states if coming
71 * via panic otherwise just fix up the ss and sp if coming via kernel
72 * mode exception.
73 */
crash_setup_regs(struct pt_regs * newregs,struct pt_regs * oldregs)74 static inline void crash_setup_regs(struct pt_regs *newregs,
75 struct pt_regs *oldregs)
76 {
77 if (oldregs) {
78 memcpy(newregs, oldregs, sizeof(*newregs));
79 } else {
80 #ifdef CONFIG_X86_32
81 asm volatile("movl %%ebx,%0" : "=m"(newregs->bx));
82 asm volatile("movl %%ecx,%0" : "=m"(newregs->cx));
83 asm volatile("movl %%edx,%0" : "=m"(newregs->dx));
84 asm volatile("movl %%esi,%0" : "=m"(newregs->si));
85 asm volatile("movl %%edi,%0" : "=m"(newregs->di));
86 asm volatile("movl %%ebp,%0" : "=m"(newregs->bp));
87 asm volatile("movl %%eax,%0" : "=m"(newregs->ax));
88 asm volatile("movl %%esp,%0" : "=m"(newregs->sp));
89 asm volatile("movl %%ss, %%eax;" :"=a"(newregs->ss));
90 asm volatile("movl %%cs, %%eax;" :"=a"(newregs->cs));
91 asm volatile("movl %%ds, %%eax;" :"=a"(newregs->ds));
92 asm volatile("movl %%es, %%eax;" :"=a"(newregs->es));
93 asm volatile("pushfl; popl %0" :"=m"(newregs->flags));
94 #else
95 asm volatile("movq %%rbx,%0" : "=m"(newregs->bx));
96 asm volatile("movq %%rcx,%0" : "=m"(newregs->cx));
97 asm volatile("movq %%rdx,%0" : "=m"(newregs->dx));
98 asm volatile("movq %%rsi,%0" : "=m"(newregs->si));
99 asm volatile("movq %%rdi,%0" : "=m"(newregs->di));
100 asm volatile("movq %%rbp,%0" : "=m"(newregs->bp));
101 asm volatile("movq %%rax,%0" : "=m"(newregs->ax));
102 asm volatile("movq %%rsp,%0" : "=m"(newregs->sp));
103 asm volatile("movq %%r8,%0" : "=m"(newregs->r8));
104 asm volatile("movq %%r9,%0" : "=m"(newregs->r9));
105 asm volatile("movq %%r10,%0" : "=m"(newregs->r10));
106 asm volatile("movq %%r11,%0" : "=m"(newregs->r11));
107 asm volatile("movq %%r12,%0" : "=m"(newregs->r12));
108 asm volatile("movq %%r13,%0" : "=m"(newregs->r13));
109 asm volatile("movq %%r14,%0" : "=m"(newregs->r14));
110 asm volatile("movq %%r15,%0" : "=m"(newregs->r15));
111 asm volatile("movl %%ss, %%eax;" :"=a"(newregs->ss));
112 asm volatile("movl %%cs, %%eax;" :"=a"(newregs->cs));
113 asm volatile("pushfq; popq %0" :"=m"(newregs->flags));
114 #endif
115 newregs->ip = _THIS_IP_;
116 }
117 }
118
119 #ifdef CONFIG_X86_32
120 asmlinkage unsigned long
121 relocate_kernel(unsigned long indirection_page,
122 unsigned long control_page,
123 unsigned long start_address,
124 unsigned int has_pae,
125 unsigned int preserve_context);
126 #else
127 unsigned long
128 relocate_kernel(unsigned long indirection_page,
129 unsigned long page_list,
130 unsigned long start_address,
131 unsigned int preserve_context,
132 unsigned int host_mem_enc_active);
133 #endif
134
135 #define ARCH_HAS_KIMAGE_ARCH
136
137 #ifdef CONFIG_X86_32
138 struct kimage_arch {
139 pgd_t *pgd;
140 #ifdef CONFIG_X86_PAE
141 pmd_t *pmd0;
142 pmd_t *pmd1;
143 #endif
144 pte_t *pte0;
145 pte_t *pte1;
146 };
147 #else
148 struct kimage_arch {
149 p4d_t *p4d;
150 pud_t *pud;
151 pmd_t *pmd;
152 pte_t *pte;
153 };
154 #endif /* CONFIG_X86_32 */
155
156 #ifdef CONFIG_X86_64
157 /*
158 * Number of elements and order of elements in this structure should match
159 * with the ones in arch/x86/purgatory/entry64.S. If you make a change here
160 * make an appropriate change in purgatory too.
161 */
162 struct kexec_entry64_regs {
163 uint64_t rax;
164 uint64_t rcx;
165 uint64_t rdx;
166 uint64_t rbx;
167 uint64_t rsp;
168 uint64_t rbp;
169 uint64_t rsi;
170 uint64_t rdi;
171 uint64_t r8;
172 uint64_t r9;
173 uint64_t r10;
174 uint64_t r11;
175 uint64_t r12;
176 uint64_t r13;
177 uint64_t r14;
178 uint64_t r15;
179 uint64_t rip;
180 };
181
182 extern int arch_kexec_post_alloc_pages(void *vaddr, unsigned int pages,
183 gfp_t gfp);
184 #define arch_kexec_post_alloc_pages arch_kexec_post_alloc_pages
185
186 extern void arch_kexec_pre_free_pages(void *vaddr, unsigned int pages);
187 #define arch_kexec_pre_free_pages arch_kexec_pre_free_pages
188
189 void arch_kexec_protect_crashkres(void);
190 #define arch_kexec_protect_crashkres arch_kexec_protect_crashkres
191
192 void arch_kexec_unprotect_crashkres(void);
193 #define arch_kexec_unprotect_crashkres arch_kexec_unprotect_crashkres
194
195 #ifdef CONFIG_KEXEC_FILE
196 struct purgatory_info;
197 int arch_kexec_apply_relocations_add(struct purgatory_info *pi,
198 Elf_Shdr *section,
199 const Elf_Shdr *relsec,
200 const Elf_Shdr *symtab);
201 #define arch_kexec_apply_relocations_add arch_kexec_apply_relocations_add
202
203 int arch_kimage_file_post_load_cleanup(struct kimage *image);
204 #define arch_kimage_file_post_load_cleanup arch_kimage_file_post_load_cleanup
205 #endif
206 #endif
207
208 extern void kdump_nmi_shootdown_cpus(void);
209
210 #ifdef CONFIG_CRASH_HOTPLUG
211 void arch_crash_handle_hotplug_event(struct kimage *image);
212 #define arch_crash_handle_hotplug_event arch_crash_handle_hotplug_event
213
214 #ifdef CONFIG_HOTPLUG_CPU
215 int arch_crash_hotplug_cpu_support(void);
216 #define crash_hotplug_cpu_support arch_crash_hotplug_cpu_support
217 #endif
218
219 #ifdef CONFIG_MEMORY_HOTPLUG
220 int arch_crash_hotplug_memory_support(void);
221 #define crash_hotplug_memory_support arch_crash_hotplug_memory_support
222 #endif
223
224 unsigned int arch_crash_get_elfcorehdr_size(void);
225 #define crash_get_elfcorehdr_size arch_crash_get_elfcorehdr_size
226 #endif
227
228 #endif /* __ASSEMBLY__ */
229
230 #endif /* _ASM_X86_KEXEC_H */
231