1 /*
2 * tboot.h: shared data structure with tboot and kernel and functions
3 * used by kernel for runtime support of Intel(R) Trusted
4 * Execution Technology
5 *
6 * Copyright (c) 2006-2009, Intel Corporation
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms and conditions of the GNU General Public License,
10 * version 2, as published by the Free Software Foundation.
11 *
12 * This program is distributed in the hope it will be useful, but WITHOUT
13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15 * more details.
16 *
17 * You should have received a copy of the GNU General Public License along with
18 * this program; if not, write to the Free Software Foundation, Inc.,
19 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 */
22
23 #ifndef _LINUX_TBOOT_H
24 #define _LINUX_TBOOT_H
25
26 /* these must have the values from 0-5 in this order */
27 enum {
28 TB_SHUTDOWN_REBOOT = 0,
29 TB_SHUTDOWN_S5,
30 TB_SHUTDOWN_S4,
31 TB_SHUTDOWN_S3,
32 TB_SHUTDOWN_HALT,
33 TB_SHUTDOWN_WFS
34 };
35
36 #ifdef CONFIG_INTEL_TXT
37 #include <linux/acpi.h>
38 /* used to communicate between tboot and the launched kernel */
39
40 #define TB_KEY_SIZE 64 /* 512 bits */
41
42 #define MAX_TB_MAC_REGIONS 32
43
44 struct tboot_mac_region {
45 u64 start; /* must be 64 byte -aligned */
46 u32 size; /* must be 64 byte -granular */
47 } __packed;
48
49 /* GAS - Generic Address Structure (ACPI 2.0+) */
50 struct tboot_acpi_generic_address {
51 u8 space_id;
52 u8 bit_width;
53 u8 bit_offset;
54 u8 access_width;
55 u64 address;
56 } __packed;
57
58 /*
59 * combines Sx info from FADT and FACS tables per ACPI 2.0+ spec
60 * (http://www.acpi.info/)
61 */
62 struct tboot_acpi_sleep_info {
63 struct tboot_acpi_generic_address pm1a_cnt_blk;
64 struct tboot_acpi_generic_address pm1b_cnt_blk;
65 struct tboot_acpi_generic_address pm1a_evt_blk;
66 struct tboot_acpi_generic_address pm1b_evt_blk;
67 u16 pm1a_cnt_val;
68 u16 pm1b_cnt_val;
69 u64 wakeup_vector;
70 u32 vector_width;
71 u64 kernel_s3_resume_vector;
72 } __packed;
73
74 /*
75 * shared memory page used for communication between tboot and kernel
76 */
77 struct tboot {
78 /*
79 * version 3+ fields:
80 */
81
82 /* TBOOT_UUID */
83 u8 uuid[16];
84
85 /* version number: 5 is current */
86 u32 version;
87
88 /* physical addr of tb_log_t log */
89 u32 log_addr;
90
91 /*
92 * physical addr of entry point for tboot shutdown and
93 * type of shutdown (TB_SHUTDOWN_*) being requested
94 */
95 u32 shutdown_entry;
96 u32 shutdown_type;
97
98 /* kernel-specified ACPI info for Sx shutdown */
99 struct tboot_acpi_sleep_info acpi_sinfo;
100
101 /* tboot location in memory (physical) */
102 u32 tboot_base;
103 u32 tboot_size;
104
105 /* memory regions (phys addrs) for tboot to MAC on S3 */
106 u8 num_mac_regions;
107 struct tboot_mac_region mac_regions[MAX_TB_MAC_REGIONS];
108
109
110 /*
111 * version 4+ fields:
112 */
113
114 /* symmetric key for use by kernel; will be encrypted on S3 */
115 u8 s3_key[TB_KEY_SIZE];
116
117
118 /*
119 * version 5+ fields:
120 */
121
122 /* used to 4byte-align num_in_wfs */
123 u8 reserved_align[3];
124
125 /* number of processors in wait-for-SIPI */
126 u32 num_in_wfs;
127 } __packed;
128
129 /*
130 * UUID for tboot data struct to facilitate matching
131 * defined as {663C8DFF-E8B3-4b82-AABF-19EA4D057A08} by tboot, which is
132 * represented as {} in the char array used here
133 */
134 #define TBOOT_UUID {0xff, 0x8d, 0x3c, 0x66, 0xb3, 0xe8, 0x82, 0x4b, 0xbf,\
135 0xaa, 0x19, 0xea, 0x4d, 0x5, 0x7a, 0x8}
136
137 extern struct tboot *tboot;
138
tboot_enabled(void)139 static inline int tboot_enabled(void)
140 {
141 return tboot != NULL;
142 }
143
144 extern void tboot_probe(void);
145 extern void tboot_shutdown(u32 shutdown_type);
146 extern struct acpi_table_header *tboot_get_dmar_table(
147 struct acpi_table_header *dmar_tbl);
148 extern int tboot_force_iommu(void);
149
150 #else
151
152 #define tboot_enabled() 0
153 #define tboot_probe() do { } while (0)
154 #define tboot_shutdown(shutdown_type) do { } while (0)
155 #define tboot_sleep(sleep_state, pm1a_control, pm1b_control) \
156 do { } while (0)
157 #define tboot_get_dmar_table(dmar_tbl) (dmar_tbl)
158 #define tboot_force_iommu() 0
159
160 #endif /* !CONFIG_INTEL_TXT */
161
162 #endif /* _LINUX_TBOOT_H */
163