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);
92void load_trampoline_pgtable(void);
93
94#endif /* __ASSEMBLY__ */
95
96#endif /* _ARCH_X86_REALMODE_H */
97