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 #endif
56 };
57 
58 extern struct real_mode_header *real_mode_header;
59 extern unsigned char real_mode_blob_end[];
60 
61 extern unsigned long initial_code;
62 extern unsigned long initial_gs;
63 extern unsigned long initial_stack;
64 #ifdef CONFIG_AMD_MEM_ENCRYPT
65 extern unsigned long initial_vc_handler;
66 #endif
67 
68 extern unsigned char real_mode_blob[];
69 extern unsigned char real_mode_relocs[];
70 
71 #ifdef CONFIG_X86_32
72 extern unsigned char startup_32_smp[];
73 extern unsigned char boot_gdt[];
74 #else
75 extern unsigned char secondary_startup_64[];
76 extern unsigned char secondary_startup_64_no_verify[];
77 #endif
78 
real_mode_size_needed(void)79 static inline size_t real_mode_size_needed(void)
80 {
81 	if (real_mode_header)
82 		return 0;	/* already allocated. */
83 
84 	return ALIGN(real_mode_blob_end - real_mode_blob, PAGE_SIZE);
85 }
86 
set_real_mode_mem(phys_addr_t mem)87 static inline void set_real_mode_mem(phys_addr_t mem)
88 {
89 	real_mode_header = (struct real_mode_header *) __va(mem);
90 }
91 
92 void reserve_real_mode(void);
93 void load_trampoline_pgtable(void);
94 
95 #endif /* __ASSEMBLY__ */
96 
97 #endif /* _ARCH_X86_REALMODE_H */
98