arch/x86/include/asm/realmode.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ARCH_X86_REALMODE_H
   3 #define _ARCH_X86_REALMODE_H
   4
   5 /*
   6  * Flag bit definitions for use with the flags field of the trampoline header
   7  * in the CONFIG_X86_64 variant.
   8  */
   9 #define TH_FLAGS_SME_ACTIVE_BIT         0
  10 #define TH_FLAGS_SME_ACTIVE             BIT(TH_FLAGS_SME_ACTIVE_BIT)
  11
  12 #ifndef __ASSEMBLY__
  13
  14 #include <linux/types.h>
  15 #include <asm/io.h>
  16
  17 /* This must match data at realmode.S */
  18 struct real_mode_header {
  19         u32     text_start;
  20         u32     ro_end;
  21         /* SMP trampoline */
  22         u32     trampoline_start;
  23         u32     trampoline_status;
  24         u32     trampoline_header;
  25 #ifdef CONFIG_X86_64
  26         u32     trampoline_pgd;
  27 #endif
  28         /* ACPI S3 wakeup */
  29 #ifdef CONFIG_ACPI_SLEEP
  30         u32     wakeup_start;
  31         u32     wakeup_header;
  32 #endif
  33         /* APM/BIOS reboot */
  34         u32     machine_real_restart_asm;
  35 #ifdef CONFIG_X86_64
  36         u32     machine_real_restart_seg;
  37 #endif
  38 };
  39
  40 /* This must match data at trampoline_32/64.S */
  41 struct trampoline_header {
  42 #ifdef CONFIG_X86_32
  43         u32 start;
  44         u16 gdt_pad;
  45         u16 gdt_limit;
  46         u32 gdt_base;
  47 #else
  48         u64 start;
  49         u64 efer;
  50         u32 cr4;
  51         u32 flags;
  52 #endif
  53 };
  54
  55 extern struct real_mode_header *real_mode_header;
  56 extern unsigned char real_mode_blob_end[];
  57
  58 extern unsigned long initial_code;
  59 extern unsigned long initial_gs;
  60 extern unsigned long initial_stack;
  61
  62 extern unsigned char real_mode_blob[];
  63 extern unsigned char real_mode_relocs[];
  64
  65 #ifdef CONFIG_X86_32
  66 extern unsigned char startup_32_smp[];
  67 extern unsigned char boot_gdt[];
  68 #else
  69 extern unsigned char secondary_startup_64[];
  70 #endif
  71
  72 static inline size_t real_mode_size_needed(void)
  73 {
  74         if (real_mode_header)
  75                 return 0;       /* already allocated. */
  76
  77         return ALIGN(real_mode_blob_end - real_mode_blob, PAGE_SIZE);
  78 }
  79
  80 void set_real_mode_mem(phys_addr_t mem, size_t size);
  81 void reserve_real_mode(void);
  82
  83 #endif /* __ASSEMBLY__ */
  84
  85 #endif /* _ARCH_X86_REALMODE_H */