arch/x86/include/asm/realmode.h

   1 #ifndef _ARCH_X86_REALMODE_H
   2 #define _ARCH_X86_REALMODE_H
   3
   4 #include <linux/types.h>
   5 #include <asm/io.h>
   6
   7 /* This must match data at realmode.S */
   8 struct real_mode_header {
   9         u32     text_start;
  10         u32     ro_end;
  11         /* SMP trampoline */
  12         u32     trampoline_start;
  13         u32     trampoline_status;
  14         u32     trampoline_header;
  15 #ifdef CONFIG_X86_64
  16         u32     trampoline_pgd;
  17 #endif
  18         /* ACPI S3 wakeup */
  19 #ifdef CONFIG_ACPI_SLEEP
  20         u32     wakeup_start;
  21         u32     wakeup_header;
  22 #endif
  23         /* APM/BIOS reboot */
  24         u32     machine_real_restart_asm;
  25 #ifdef CONFIG_X86_64
  26         u32     machine_real_restart_seg;
  27 #endif
  28 };
  29
  30 /* This must match data at trampoline_32/64.S */
  31 struct trampoline_header {
  32 #ifdef CONFIG_X86_32
  33         u32 start;
  34         u16 gdt_pad;
  35         u16 gdt_limit;
  36         u32 gdt_base;
  37 #else
  38         u64 start;
  39         u64 efer;
  40         u32 cr4;
  41 #endif
  42 };
  43
  44 extern struct real_mode_header *real_mode_header;
  45 extern unsigned char real_mode_blob_end[];
  46
  47 extern unsigned long initial_code;
  48 extern unsigned long initial_gs;
  49 extern unsigned long initial_stack;
  50
  51 extern unsigned char real_mode_blob[];
  52 extern unsigned char real_mode_relocs[];
  53
  54 #ifdef CONFIG_X86_32
  55 extern unsigned char startup_32_smp[];
  56 extern unsigned char boot_gdt[];
  57 #else
  58 extern unsigned char secondary_startup_64[];
  59 #endif
  60
  61 static inline size_t real_mode_size_needed(void)
  62 {
  63         if (real_mode_header)
  64                 return 0;       /* already allocated. */
  65
  66         return ALIGN(real_mode_blob_end - real_mode_blob, PAGE_SIZE);
  67 }
  68
  69 void set_real_mode_mem(phys_addr_t mem, size_t size);
  70 void reserve_real_mode(void);
  71
  72 #endif /* _ARCH_X86_REALMODE_H */