include/asm-x86_64/kexec.h

   1 #ifndef _X86_64_KEXEC_H
   2 #define _X86_64_KEXEC_H
   3
   4 #define PA_CONTROL_PAGE  0
   5 #define VA_CONTROL_PAGE  1
   6 #define PA_PGD           2
   7 #define VA_PGD           3
   8 #define PA_PUD_0         4
   9 #define VA_PUD_0         5
  10 #define PA_PMD_0         6
  11 #define VA_PMD_0         7
  12 #define PA_PTE_0         8
  13 #define VA_PTE_0         9
  14 #define PA_PUD_1         10
  15 #define VA_PUD_1         11
  16 #define PA_PMD_1         12
  17 #define VA_PMD_1         13
  18 #define PA_PTE_1         14
  19 #define VA_PTE_1         15
  20 #define PA_TABLE_PAGE    16
  21 #define PAGES_NR         17
  22
  23 #ifndef __ASSEMBLY__
  24
  25 #include <linux/string.h>
  26
  27 #include <asm/page.h>
  28 #include <asm/ptrace.h>
  29
  30 /*
  31  * KEXEC_SOURCE_MEMORY_LIMIT maximum page get_free_page can return.
  32  * I.e. Maximum page that is mapped directly into kernel memory,
  33  * and kmap is not required.
  34  *
  35  * So far x86_64 is limited to 40 physical address bits.
  36  */
  37
  38 /* Maximum physical address we can use pages from */
  39 #define KEXEC_SOURCE_MEMORY_LIMIT      (0xFFFFFFFFFFUL)
  40 /* Maximum address we can reach in physical address mode */
  41 #define KEXEC_DESTINATION_MEMORY_LIMIT (0xFFFFFFFFFFUL)
  42 /* Maximum address we can use for the control pages */
  43 #define KEXEC_CONTROL_MEMORY_LIMIT     (0xFFFFFFFFFFUL)
  44
  45 /* Allocate one page for the pdp and the second for the code */
  46 #define KEXEC_CONTROL_CODE_SIZE  (4096UL + 4096UL)
  47
  48 /* The native architecture */
  49 #define KEXEC_ARCH KEXEC_ARCH_X86_64
  50
  51 /*
  52  * Saving the registers of the cpu on which panic occured in
  53  * crash_kexec to save a valid sp. The registers of other cpus
  54  * will be saved in machine_crash_shutdown while shooting down them.
  55  */
  56
  57 static inline void crash_setup_regs(struct pt_regs *newregs,
  58                                                 struct pt_regs *oldregs)
  59 {
  60         if (oldregs)
  61                 memcpy(newregs, oldregs, sizeof(*newregs));
  62         else {
  63                 __asm__ __volatile__("movq %%rbx,%0" : "=m"(newregs->rbx));
  64                 __asm__ __volatile__("movq %%rcx,%0" : "=m"(newregs->rcx));
  65                 __asm__ __volatile__("movq %%rdx,%0" : "=m"(newregs->rdx));
  66                 __asm__ __volatile__("movq %%rsi,%0" : "=m"(newregs->rsi));
  67                 __asm__ __volatile__("movq %%rdi,%0" : "=m"(newregs->rdi));
  68                 __asm__ __volatile__("movq %%rbp,%0" : "=m"(newregs->rbp));
  69                 __asm__ __volatile__("movq %%rax,%0" : "=m"(newregs->rax));
  70                 __asm__ __volatile__("movq %%rsp,%0" : "=m"(newregs->rsp));
  71                 __asm__ __volatile__("movq %%r8,%0" : "=m"(newregs->r8));
  72                 __asm__ __volatile__("movq %%r9,%0" : "=m"(newregs->r9));
  73                 __asm__ __volatile__("movq %%r10,%0" : "=m"(newregs->r10));
  74                 __asm__ __volatile__("movq %%r11,%0" : "=m"(newregs->r11));
  75                 __asm__ __volatile__("movq %%r12,%0" : "=m"(newregs->r12));
  76                 __asm__ __volatile__("movq %%r13,%0" : "=m"(newregs->r13));
  77                 __asm__ __volatile__("movq %%r14,%0" : "=m"(newregs->r14));
  78                 __asm__ __volatile__("movq %%r15,%0" : "=m"(newregs->r15));
  79                 __asm__ __volatile__("movl %%ss, %%eax;" :"=a"(newregs->ss));
  80                 __asm__ __volatile__("movl %%cs, %%eax;" :"=a"(newregs->cs));
  81                 __asm__ __volatile__("pushfq; popq %0" :"=m"(newregs->eflags));
  82
  83                 newregs->rip = (unsigned long)current_text_addr();
  84         }
  85 }
  86
  87 NORET_TYPE void
  88 relocate_kernel(unsigned long indirection_page,
  89                 unsigned long page_list,
  90                 unsigned long start_address) ATTRIB_NORET;
  91
  92 #endif /* __ASSEMBLY__ */
  93
  94 #endif /* _X86_64_KEXEC_H */