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_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 */
44 struct 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
59 extern struct real_mode_header *real_mode_header;
60 extern unsigned char real_mode_blob_end[];
61
62 extern unsigned long initial_code;
63 extern unsigned long initial_stack;
64 #ifdef CONFIG_AMD_MEM_ENCRYPT
65 extern unsigned long initial_vc_handler;
66 #endif
67
68 extern u32 *trampoline_lock;
69
70 extern unsigned char real_mode_blob[];
71 extern unsigned char real_mode_relocs[];
72
73 #ifdef CONFIG_X86_32
74 extern unsigned char startup_32_smp[];
75 extern unsigned char boot_gdt[];
76 #else
77 extern unsigned char secondary_startup_64[];
78 extern unsigned char secondary_startup_64_no_verify[];
79 #endif
80
81 static 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
89 static inline void set_real_mode_mem(phys_addr_t mem)
90 {
91 real_mode_header = (struct real_mode_header *) __va(mem);
92 }
93
94 void reserve_real_mode(void);
95 void load_trampoline_pgtable(void);
96 void init_real_mode(void);
97
98 #endif /* __ASSEMBLY__ */
99
100 #endif /* _ARCH_X86_REALMODE_H */
101
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