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