arch/x86/include/asm/kexec.h

   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 sme_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         /* Core ELF header buffer */
 155         void *elf_headers;
 156         unsigned long elf_headers_sz;
 157         unsigned long elf_load_addr;
 158 };
 159 #endif /* CONFIG_X86_32 */
 160
 161 #ifdef CONFIG_X86_64
 162 /*
 163  * Number of elements and order of elements in this structure should match
 164  * with the ones in arch/x86/purgatory/entry64.S. If you make a change here
 165  * make an appropriate change in purgatory too.
 166  */
 167 struct kexec_entry64_regs {
 168         uint64_t rax;
 169         uint64_t rcx;
 170         uint64_t rdx;
 171         uint64_t rbx;
 172         uint64_t rsp;
 173         uint64_t rbp;
 174         uint64_t rsi;
 175         uint64_t rdi;
 176         uint64_t r8;
 177         uint64_t r9;
 178         uint64_t r10;
 179         uint64_t r11;
 180         uint64_t r12;
 181         uint64_t r13;
 182         uint64_t r14;
 183         uint64_t r15;
 184         uint64_t rip;
 185 };
 186
 187 extern int arch_kexec_post_alloc_pages(void *vaddr, unsigned int pages,
 188                                        gfp_t gfp);
 189 #define arch_kexec_post_alloc_pages arch_kexec_post_alloc_pages
 190
 191 extern void arch_kexec_pre_free_pages(void *vaddr, unsigned int pages);
 192 #define arch_kexec_pre_free_pages arch_kexec_pre_free_pages
 193
 194 #endif
 195
 196 typedef void crash_vmclear_fn(void);
 197 extern crash_vmclear_fn __rcu *crash_vmclear_loaded_vmcss;
 198 extern void kdump_nmi_shootdown_cpus(void);
 199
 200 #endif /* __ASSEMBLY__ */
 201
 202 #endif /* _ASM_X86_KEXEC_H */