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TOMOYO Linux Cross Reference
Linux/include/linux/tboot.h

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  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 
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 

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