LXR linux/arch/x86/include/asm/intel

   1#ifndef _ASM_X86_INTEL_PCONFIG_H
   2#define _ASM_X86_INTEL_PCONFIG_H
   3
   4#include <asm/asm.h>
   5#include <asm/processor.h>
   6
   7enum pconfig_target {
   8        INVALID_TARGET  = 0,
   9        MKTME_TARGET    = 1,
  10        PCONFIG_TARGET_NR
  11};
  12
  13int pconfig_target_supported(enum pconfig_target target);
  14
  15enum pconfig_leaf {
  16        MKTME_KEY_PROGRAM       = 0,
  17        PCONFIG_LEAF_INVALID,
  18};
  19
  20#define PCONFIG ".byte 0x0f, 0x01, 0xc5"
  21
  22/* Defines and structure for MKTME_KEY_PROGRAM of PCONFIG instruction */
  23
  24/* mktme_key_program::keyid_ctrl COMMAND, bits [7:0] */
  25#define MKTME_KEYID_SET_KEY_DIRECT      0
  26#define MKTME_KEYID_SET_KEY_RANDOM      1
  27#define MKTME_KEYID_CLEAR_KEY           2
  28#define MKTME_KEYID_NO_ENCRYPT          3
  29
  30/* mktme_key_program::keyid_ctrl ENC_ALG, bits [23:8] */
  31#define MKTME_AES_XTS_128       (1 << 8)
  32
  33/* Return codes from the PCONFIG MKTME_KEY_PROGRAM */
  34#define MKTME_PROG_SUCCESS      0
  35#define MKTME_INVALID_PROG_CMD  1
  36#define MKTME_ENTROPY_ERROR     2
  37#define MKTME_INVALID_KEYID     3
  38#define MKTME_INVALID_ENC_ALG   4
  39#define MKTME_DEVICE_BUSY       5
  40
  41/* Hardware requires the structure to be 256 byte alinged. Otherwise #GP(0). */
  42struct mktme_key_program {
  43        u16 keyid;
  44        u32 keyid_ctrl;
  45        u8 __rsvd[58];
  46        u8 key_field_1[64];
  47        u8 key_field_2[64];
  48} __packed __aligned(256);
  49
  50static inline int mktme_key_program(struct mktme_key_program *key_program)
  51{
  52        unsigned long rax = MKTME_KEY_PROGRAM;
  53
  54        if (!pconfig_target_supported(MKTME_TARGET))
  55                return -ENXIO;
  56
  57        asm volatile(PCONFIG
  58                : "=a" (rax), "=b" (key_program)
  59                : "0" (rax), "1" (key_program)
  60                : "memory", "cc");
  61
  62        return rax;
  63}
  64
  65#endif  /* _ASM_X86_INTEL_PCONFIG_H */
  66