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/rm/header.S */
  18 struct real_mode_header {
  19         u32     text_start;
  20         u32     ro_end;
  21         /* SMP trampoline */
  22         u32     trampoline_start;
  23         u32     trampoline_header;
  24 #ifdef CONFIG_X86_64
  25         u32     trampoline_pgd;
  26 #endif
  27         /* ACPI S3 wakeup */
  28 #ifdef CONFIG_ACPI_SLEEP
  29         u32     wakeup_start;
  30         u32     wakeup_header;
  31 #endif
  32         /* APM/BIOS reboot */
  33         u32     machine_real_restart_asm;
  34 #ifdef CONFIG_X86_64
  35         u32     machine_real_restart_seg;
  36 #endif
  37 };
  38
  39 /* This must match data at realmode/rm/trampoline_{32,64}.S */
  40 struct trampoline_header {
  41 #ifdef CONFIG_X86_32
  42         u32 start;
  43         u16 gdt_pad;
  44         u16 gdt_limit;
  45         u32 gdt_base;
  46 #else
  47         u64 start;
  48         u64 efer;
  49         u32 cr4;
  50         u32 flags;
  51 #endif
  52 };
  53
  54 extern struct real_mode_header *real_mode_header;
  55 extern unsigned char real_mode_blob_end[];
  56
  57 extern unsigned long initial_code;
  58 extern unsigned long initial_gs;
  59 extern unsigned long initial_stack;
  60
  61 extern unsigned char real_mode_blob[];
  62 extern unsigned char real_mode_relocs[];
  63
  64 #ifdef CONFIG_X86_32
  65 extern unsigned char startup_32_smp[];
  66 extern unsigned char boot_gdt[];
  67 #else
  68 extern unsigned char secondary_startup_64[];
  69 #endif
  70
  71 static inline size_t real_mode_size_needed(void)
  72 {
  73         if (real_mode_header)
  74                 return 0;       /* already allocated. */
  75
  76         return ALIGN(real_mode_blob_end - real_mode_blob, PAGE_SIZE);
  77 }
  78
  79 static inline void set_real_mode_mem(phys_addr_t mem)
  80 {
  81         real_mode_header = (struct real_mode_header *) __va(mem);
  82 }
  83
  84 void reserve_real_mode(void);
  85
  86 #endif /* __ASSEMBLY__ */
  87
  88 #endif /* _ARCH_X86_REALMODE_H */