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 */
  27enum {
  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 <acpi/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
  44struct 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+) */
  50struct 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 */
  62struct 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 */
  77struct 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
 137extern struct tboot *tboot;
 138
 139static inline int tboot_enabled(void)
 140{
 141        return tboot != NULL;
 142}
 143
 144extern void tboot_probe(void);
 145extern void tboot_shutdown(u32 shutdown_type);
 146extern struct acpi_table_header *tboot_get_dmar_table(
 147                                      struct acpi_table_header *dmar_tbl);
 148extern 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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