include/linux/tboot.h

   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 */