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 __ASSEMBLER__
13
14#include <linux/types.h>
15#include <asm/io.h>
16
17/* This must match data at realmode/rm/header.S */
18struct 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_start64;
29 u32 trampoline_pgd;
30#endif
31 /* ACPI S3 wakeup */
32#ifdef CONFIG_ACPI_SLEEP
33 u32 wakeup_start;
34 u32 wakeup_header;
35#endif
36 /* APM/BIOS reboot */
37 u32 machine_real_restart_asm;
38#ifdef CONFIG_X86_64
39 u32 machine_real_restart_seg;
40#endif
41};
42
43/* This must match data at realmode/rm/trampoline_{32,64}.S */
44struct trampoline_header {
45#ifdef CONFIG_X86_32
46 u32 start;
47 u16 gdt_pad;
48 u16 gdt_limit;
49 u32 gdt_base;
50#else
51 u64 start;
52 u64 efer;
53 u32 cr4;
54 u32 flags;
55 u32 lock;
56#endif
57};
58
59extern struct real_mode_header *real_mode_header;
60extern unsigned char real_mode_blob_end[];
61
62extern unsigned long initial_code;
63extern unsigned long initial_stack;
64#ifdef CONFIG_AMD_MEM_ENCRYPT
65extern unsigned long initial_vc_handler;
66#endif
67
68extern u32 *trampoline_lock;
69
70extern unsigned char real_mode_blob[];
71extern unsigned char real_mode_relocs[];
72
73#ifdef CONFIG_X86_32
74extern unsigned char startup_32_smp[];
75extern unsigned char boot_gdt[];
76#else
77extern unsigned char secondary_startup_64[];
78extern unsigned char secondary_startup_64_no_verify[];
79#endif
80
81static __always_inline size_t real_mode_size_needed(void)
82{
83 if (real_mode_header)
84 return 0; /* already allocated. */
85
86 return ALIGN(real_mode_blob_end - real_mode_blob, PAGE_SIZE);
87}
88
89static inline void set_real_mode_mem(phys_addr_t mem)
90{
91 real_mode_header = (struct real_mode_header *) __va(mem);
92}
93
94void reserve_real_mode(void);
95void load_trampoline_pgtable(void);
96void init_real_mode(void);
97
98#endif /* __ASSEMBLER__ */
99
100#endif /* _ARCH_X86_REALMODE_H */
101

source code of linux/arch/x86/include/asm/realmode.h