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Linux kernel mirror (for testing)
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linux
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 */
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_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 */
43struct 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
57extern struct real_mode_header *real_mode_header;
58extern unsigned char real_mode_blob_end[];
59
60extern unsigned long initial_code;
61extern unsigned long initial_gs;
62extern unsigned long initial_stack;
63#ifdef CONFIG_AMD_MEM_ENCRYPT
64extern unsigned long initial_vc_handler;
65#endif
66
67extern unsigned char real_mode_blob[];
68extern unsigned char real_mode_relocs[];
69
70#ifdef CONFIG_X86_32
71extern unsigned char startup_32_smp[];
72extern unsigned char boot_gdt[];
73#else
74extern unsigned char secondary_startup_64[];
75extern unsigned char secondary_startup_64_no_verify[];
76#endif
77
78static 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
86static inline void set_real_mode_mem(phys_addr_t mem)
87{
88 real_mode_header = (struct real_mode_header *) __va(mem);
89}
90
91void reserve_real_mode(void);
92
93#endif /* __ASSEMBLY__ */
94
95#endif /* _ARCH_X86_REALMODE_H */