1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * tboot.h: shared data structure with tboot and kernel and functions
4 * used by kernel for runtime support of Intel(R) Trusted
5 * Execution Technology
6 *
7 * Copyright (c) 2006-2009, Intel Corporation
8 */
9
10 #ifndef _LINUX_TBOOT_H
11 #define _LINUX_TBOOT_H
12
13 /* these must have the values from 0-5 in this order */
14 enum {
15 TB_SHUTDOWN_REBOOT = 0,
16 TB_SHUTDOWN_S5,
17 TB_SHUTDOWN_S4,
18 TB_SHUTDOWN_S3,
19 TB_SHUTDOWN_HALT,
20 TB_SHUTDOWN_WFS
21 };
22
23 #ifdef CONFIG_INTEL_TXT
24 #include <linux/acpi.h>
25 /* used to communicate between tboot and the launched kernel */
26
27 #define TB_KEY_SIZE 64 /* 512 bits */
28
29 #define MAX_TB_MAC_REGIONS 32
30
31 struct tboot_mac_region {
32 u64 start; /* must be 64 byte -aligned */
33 u32 size; /* must be 64 byte -granular */
34 } __packed;
35
36 /* GAS - Generic Address Structure (ACPI 2.0+) */
37 struct tboot_acpi_generic_address {
38 u8 space_id;
39 u8 bit_width;
40 u8 bit_offset;
41 u8 access_width;
42 u64 address;
43 } __packed;
44
45 /*
46 * combines Sx info from FADT and FACS tables per ACPI 2.0+ spec
47 * (http://www.acpi.info/)
48 */
49 struct tboot_acpi_sleep_info {
50 struct tboot_acpi_generic_address pm1a_cnt_blk;
51 struct tboot_acpi_generic_address pm1b_cnt_blk;
52 struct tboot_acpi_generic_address pm1a_evt_blk;
53 struct tboot_acpi_generic_address pm1b_evt_blk;
54 u16 pm1a_cnt_val;
55 u16 pm1b_cnt_val;
56 u64 wakeup_vector;
57 u32 vector_width;
58 u64 kernel_s3_resume_vector;
59 } __packed;
60
61 /*
62 * shared memory page used for communication between tboot and kernel
63 */
64 struct tboot {
65 /*
66 * version 3+ fields:
67 */
68
69 /* TBOOT_UUID */
70 u8 uuid[16];
71
72 /* version number: 5 is current */
73 u32 version;
74
75 /* physical addr of tb_log_t log */
76 u32 log_addr;
77
78 /*
79 * physical addr of entry point for tboot shutdown and
80 * type of shutdown (TB_SHUTDOWN_*) being requested
81 */
82 u32 shutdown_entry;
83 u32 shutdown_type;
84
85 /* kernel-specified ACPI info for Sx shutdown */
86 struct tboot_acpi_sleep_info acpi_sinfo;
87
88 /* tboot location in memory (physical) */
89 u32 tboot_base;
90 u32 tboot_size;
91
92 /* memory regions (phys addrs) for tboot to MAC on S3 */
93 u8 num_mac_regions;
94 struct tboot_mac_region mac_regions[MAX_TB_MAC_REGIONS];
95
96
97 /*
98 * version 4+ fields:
99 */
100
101 /* symmetric key for use by kernel; will be encrypted on S3 */
102 u8 s3_key[TB_KEY_SIZE];
103
104
105 /*
106 * version 5+ fields:
107 */
108
109 /* used to 4byte-align num_in_wfs */
110 u8 reserved_align[3];
111
112 /* number of processors in wait-for-SIPI */
113 u32 num_in_wfs;
114 } __packed;
115
116 /*
117 * UUID for tboot data struct to facilitate matching
118 * defined as {663C8DFF-E8B3-4b82-AABF-19EA4D057A08} by tboot, which is
119 * represented as {} in the char array used here
120 */
121 #define TBOOT_UUID {0xff, 0x8d, 0x3c, 0x66, 0xb3, 0xe8, 0x82, 0x4b, 0xbf,\
122 0xaa, 0x19, 0xea, 0x4d, 0x5, 0x7a, 0x8}
123
124 extern struct tboot *tboot;
125
tboot_enabled(void)126 static inline int tboot_enabled(void)
127 {
128 return tboot != NULL;
129 }
130
131 extern void tboot_probe(void);
132 extern void tboot_shutdown(u32 shutdown_type);
133 extern struct acpi_table_header *tboot_get_dmar_table(
134 struct acpi_table_header *dmar_tbl);
135 extern int tboot_force_iommu(void);
136
137 #else
138
139 #define tboot_enabled() 0
140 #define tboot_probe() do { } while (0)
141 #define tboot_shutdown(shutdown_type) do { } while (0)
142 #define tboot_sleep(sleep_state, pm1a_control, pm1b_control) \
143 do { } while (0)
144 #define tboot_get_dmar_table(dmar_tbl) (dmar_tbl)
145 #define tboot_force_iommu() 0
146
147 #endif /* !CONFIG_INTEL_TXT */
148
149 #endif /* _LINUX_TBOOT_H */
150
