arch/x86/include/asm/intel_pconfig.h

   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
   7 enum pconfig_target {
   8         INVALID_TARGET  = 0,
   9         MKTME_TARGET    = 1,
  10         PCONFIG_TARGET_NR
  11 };
  12
  13 int pconfig_target_supported(enum pconfig_target target);
  14
  15 enum 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). */
  42 struct 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
  50 static 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 */