include/asm-x86/kexec.h

   1 #ifndef _KEXEC_H
   2 #define _KEXEC_H
   3
   4 #ifdef CONFIG_X86_32
   5 # define PA_CONTROL_PAGE        0
   6 # define VA_CONTROL_PAGE        1
   7 # define PA_PGD                 2
   8 # define VA_PGD                 3
   9 # define PA_PTE_0               4
  10 # define VA_PTE_0               5
  11 # define PA_PTE_1               6
  12 # define VA_PTE_1               7
  13 # ifdef CONFIG_X86_PAE
  14 #  define PA_PMD_0              8
  15 #  define VA_PMD_0              9
  16 #  define PA_PMD_1              10
  17 #  define VA_PMD_1              11
  18 #  define PAGES_NR              12
  19 # else
  20 #  define PAGES_NR              8
  21 # endif
  22 #else
  23 # define PA_CONTROL_PAGE        0
  24 # define VA_CONTROL_PAGE        1
  25 # define PA_PGD                 2
  26 # define VA_PGD                 3
  27 # define PA_PUD_0               4
  28 # define VA_PUD_0               5
  29 # define PA_PMD_0               6
  30 # define VA_PMD_0               7
  31 # define PA_PTE_0               8
  32 # define VA_PTE_0               9
  33 # define PA_PUD_1               10
  34 # define VA_PUD_1               11
  35 # define PA_PMD_1               12
  36 # define VA_PMD_1               13
  37 # define PA_PTE_1               14
  38 # define VA_PTE_1               15
  39 # define PA_TABLE_PAGE          16
  40 # define PAGES_NR               17
  41 #endif
  42
  43 #ifndef __ASSEMBLY__
  44
  45 #include <linux/string.h>
  46
  47 #include <asm/page.h>
  48 #include <asm/ptrace.h>
  49
  50 /*
  51  * KEXEC_SOURCE_MEMORY_LIMIT maximum page get_free_page can return.
  52  * I.e. Maximum page that is mapped directly into kernel memory,
  53  * and kmap is not required.
  54  *
  55  * So far x86_64 is limited to 40 physical address bits.
  56  */
  57 #ifdef CONFIG_X86_32
  58 /* Maximum physical address we can use pages from */
  59 # define KEXEC_SOURCE_MEMORY_LIMIT (-1UL)
  60 /* Maximum address we can reach in physical address mode */
  61 # define KEXEC_DESTINATION_MEMORY_LIMIT (-1UL)
  62 /* Maximum address we can use for the control code buffer */
  63 # define KEXEC_CONTROL_MEMORY_LIMIT TASK_SIZE
  64
  65 # define KEXEC_CONTROL_CODE_SIZE        4096
  66
  67 /* The native architecture */
  68 # define KEXEC_ARCH KEXEC_ARCH_386
  69
  70 /* We can also handle crash dumps from 64 bit kernel. */
  71 # define vmcore_elf_check_arch_cross(x) ((x)->e_machine == EM_X86_64)
  72 #else
  73 /* Maximum physical address we can use pages from */
  74 # define KEXEC_SOURCE_MEMORY_LIMIT      (0xFFFFFFFFFFUL)
  75 /* Maximum address we can reach in physical address mode */
  76 # define KEXEC_DESTINATION_MEMORY_LIMIT (0xFFFFFFFFFFUL)
  77 /* Maximum address we can use for the control pages */
  78 # define KEXEC_CONTROL_MEMORY_LIMIT     (0xFFFFFFFFFFUL)
  79
  80 /* Allocate one page for the pdp and the second for the code */
  81 # define KEXEC_CONTROL_CODE_SIZE  (4096UL + 4096UL)
  82
  83 /* The native architecture */
  84 # define KEXEC_ARCH KEXEC_ARCH_X86_64
  85 #endif
  86
  87 /*
  88  * CPU does not save ss and sp on stack if execution is already
  89  * running in kernel mode at the time of NMI occurrence. This code
  90  * fixes it.
  91  */
  92 static inline void crash_fixup_ss_esp(struct pt_regs *newregs,
  93                                       struct pt_regs *oldregs)
  94 {
  95 #ifdef CONFIG_X86_32
  96         newregs->sp = (unsigned long)&(oldregs->sp);
  97         __asm__ __volatile__(
  98                         "xorl %%eax, %%eax\n\t"
  99                         "movw %%ss, %%ax\n\t"
 100                         :"=a"(newregs->ss));
 101 #endif
 102 }
 103
 104 /*
 105  * This function is responsible for capturing register states if coming
 106  * via panic otherwise just fix up the ss and sp if coming via kernel
 107  * mode exception.
 108  */
 109 static inline void crash_setup_regs(struct pt_regs *newregs,
 110                                     struct pt_regs *oldregs)
 111 {
 112         if (oldregs) {
 113                 memcpy(newregs, oldregs, sizeof(*newregs));
 114                 crash_fixup_ss_esp(newregs, oldregs);
 115         } else {
 116 #ifdef CONFIG_X86_32
 117                 __asm__ __volatile__("movl %%ebx,%0" : "=m"(newregs->bx));
 118                 __asm__ __volatile__("movl %%ecx,%0" : "=m"(newregs->cx));
 119                 __asm__ __volatile__("movl %%edx,%0" : "=m"(newregs->dx));
 120                 __asm__ __volatile__("movl %%esi,%0" : "=m"(newregs->si));
 121                 __asm__ __volatile__("movl %%edi,%0" : "=m"(newregs->di));
 122                 __asm__ __volatile__("movl %%ebp,%0" : "=m"(newregs->bp));
 123                 __asm__ __volatile__("movl %%eax,%0" : "=m"(newregs->ax));
 124                 __asm__ __volatile__("movl %%esp,%0" : "=m"(newregs->sp));
 125                 __asm__ __volatile__("movl %%ss, %%eax;" :"=a"(newregs->ss));
 126                 __asm__ __volatile__("movl %%cs, %%eax;" :"=a"(newregs->cs));
 127                 __asm__ __volatile__("movl %%ds, %%eax;" :"=a"(newregs->ds));
 128                 __asm__ __volatile__("movl %%es, %%eax;" :"=a"(newregs->es));
 129                 __asm__ __volatile__("pushfl; popl %0" :"=m"(newregs->flags));
 130 #else
 131                 __asm__ __volatile__("movq %%rbx,%0" : "=m"(newregs->bx));
 132                 __asm__ __volatile__("movq %%rcx,%0" : "=m"(newregs->cx));
 133                 __asm__ __volatile__("movq %%rdx,%0" : "=m"(newregs->dx));
 134                 __asm__ __volatile__("movq %%rsi,%0" : "=m"(newregs->si));
 135                 __asm__ __volatile__("movq %%rdi,%0" : "=m"(newregs->di));
 136                 __asm__ __volatile__("movq %%rbp,%0" : "=m"(newregs->bp));
 137                 __asm__ __volatile__("movq %%rax,%0" : "=m"(newregs->ax));
 138                 __asm__ __volatile__("movq %%rsp,%0" : "=m"(newregs->sp));
 139                 __asm__ __volatile__("movq %%r8,%0" : "=m"(newregs->r8));
 140                 __asm__ __volatile__("movq %%r9,%0" : "=m"(newregs->r9));
 141                 __asm__ __volatile__("movq %%r10,%0" : "=m"(newregs->r10));
 142                 __asm__ __volatile__("movq %%r11,%0" : "=m"(newregs->r11));
 143                 __asm__ __volatile__("movq %%r12,%0" : "=m"(newregs->r12));
 144                 __asm__ __volatile__("movq %%r13,%0" : "=m"(newregs->r13));
 145                 __asm__ __volatile__("movq %%r14,%0" : "=m"(newregs->r14));
 146                 __asm__ __volatile__("movq %%r15,%0" : "=m"(newregs->r15));
 147                 __asm__ __volatile__("movl %%ss, %%eax;" :"=a"(newregs->ss));
 148                 __asm__ __volatile__("movl %%cs, %%eax;" :"=a"(newregs->cs));
 149                 __asm__ __volatile__("pushfq; popq %0" :"=m"(newregs->flags));
 150 #endif
 151                 newregs->ip = (unsigned long)current_text_addr();
 152         }
 153 }
 154
 155 #ifdef CONFIG_X86_32
 156 asmlinkage NORET_TYPE void
 157 relocate_kernel(unsigned long indirection_page,
 158                 unsigned long control_page,
 159                 unsigned long start_address,
 160                 unsigned int has_pae) ATTRIB_NORET;
 161 #else
 162 NORET_TYPE void
 163 relocate_kernel(unsigned long indirection_page,
 164                 unsigned long page_list,
 165                 unsigned long start_address) ATTRIB_NORET;
 166 #endif
 167
 168 #endif /* __ASSEMBLY__ */
 169
 170 #endif /* _KEXEC_H */