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 */ 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 #endif 190 191 typedef void crash_vmclear_fn(void); 192 extern crash_vmclear_fn __rcu *crash_vmclear_loaded_vmcss; 193 extern void kdump_nmi_shootdown_cpus(void); 194 195 #endif /* __ASSEMBLY__ */ 196 197 #endif /* _ASM_X86_KEXEC_H */ 198