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_AMD_MEM_ENCRYPT
  25         u32     sev_es_trampoline_start;
  26 #endif
  27 #ifdef CONFIG_X86_64
  28         u32     trampoline_pgd;
  29 #endif
  30         /* ACPI S3 wakeup */
  31 #ifdef CONFIG_ACPI_SLEEP
  32         u32     wakeup_start;
  33         u32     wakeup_header;
  34 #endif
  35         /* APM/BIOS reboot */
  36         u32     machine_real_restart_asm;
  37 #ifdef CONFIG_X86_64
  38         u32     machine_real_restart_seg;
  39 #endif
  40 };
  41
  42 /* This must match data at realmode/rm/trampoline_{32,64}.S */
  43 struct trampoline_header {
  44 #ifdef CONFIG_X86_32
  45         u32 start;
  46         u16 gdt_pad;
  47         u16 gdt_limit;
  48         u32 gdt_base;
  49 #else
  50         u64 start;
  51         u64 efer;
  52         u32 cr4;
  53         u32 flags;
  54 #endif
  55 };
  56
  57 extern struct real_mode_header *real_mode_header;
  58 extern unsigned char real_mode_blob_end[];
  59
  60 extern unsigned long initial_code;
  61 extern unsigned long initial_gs;
  62 extern unsigned long initial_stack;
  63 #ifdef CONFIG_AMD_MEM_ENCRYPT
  64 extern unsigned long initial_vc_handler;
  65 #endif
  66
  67 extern unsigned char real_mode_blob[];
  68 extern unsigned char real_mode_relocs[];
  69
  70 #ifdef CONFIG_X86_32
  71 extern unsigned char startup_32_smp[];
  72 extern unsigned char boot_gdt[];
  73 #else
  74 extern unsigned char secondary_startup_64[];
  75 extern unsigned char secondary_startup_64_no_verify[];
  76 #endif
  77
  78 static inline size_t real_mode_size_needed(void)
  79 {
  80         if (real_mode_header)
  81                 return 0;       /* already allocated. */
  82
  83         return ALIGN(real_mode_blob_end - real_mode_blob, PAGE_SIZE);
  84 }
  85
  86 static inline void set_real_mode_mem(phys_addr_t mem)
  87 {
  88         real_mode_header = (struct real_mode_header *) __va(mem);
  89 }
  90
  91 void reserve_real_mode(void);
  92
  93 #endif /* __ASSEMBLY__ */
  94
  95 #endif /* _ARCH_X86_REALMODE_H */