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.S */
18struct real_mode_header {
19 u32 text_start;
20 u32 ro_end;
21 /* SMP trampoline */
22 u32 trampoline_start;
23 u32 trampoline_status;
24 u32 trampoline_header;
25#ifdef CONFIG_X86_64
26 u32 trampoline_pgd;
27#endif
28 /* ACPI S3 wakeup */
29#ifdef CONFIG_ACPI_SLEEP
30 u32 wakeup_start;
31 u32 wakeup_header;
32#endif
33 /* APM/BIOS reboot */
34 u32 machine_real_restart_asm;
35#ifdef CONFIG_X86_64
36 u32 machine_real_restart_seg;
37#endif
38};
39
40/* This must match data at trampoline_32/64.S */
41struct trampoline_header {
42#ifdef CONFIG_X86_32
43 u32 start;
44 u16 gdt_pad;
45 u16 gdt_limit;
46 u32 gdt_base;
47#else
48 u64 start;
49 u64 efer;
50 u32 cr4;
51 u32 flags;
52#endif
53};
54
55extern struct real_mode_header *real_mode_header;
56extern unsigned char real_mode_blob_end[];
57
58extern unsigned long initial_code;
59extern unsigned long initial_gs;
60extern unsigned long initial_stack;
61
62extern unsigned char real_mode_blob[];
63extern unsigned char real_mode_relocs[];
64
65#ifdef CONFIG_X86_32
66extern unsigned char startup_32_smp[];
67extern unsigned char boot_gdt[];
68#else
69extern unsigned char secondary_startup_64[];
70#endif
71
72static inline size_t real_mode_size_needed(void)
73{
74 if (real_mode_header)
75 return 0; /* already allocated. */
76
77 return ALIGN(real_mode_blob_end - real_mode_blob, PAGE_SIZE);
78}
79
80void set_real_mode_mem(phys_addr_t mem, size_t size);
81void reserve_real_mode(void);
82
83#endif /* __ASSEMBLY__ */
84
85#endif /* _ARCH_X86_REALMODE_H */
86