include/asm/intel_pconfig.h

0001 #ifndef _ASM_X86_INTEL_PCONFIG_H
0002 #define _ASM_X86_INTEL_PCONFIG_H
0003
0004 #include <asm/asm.h>
0005 #include <asm/processor.h>
0006
0007 enum pconfig_target {
0008     INVALID_TARGET  = 0,
0009     MKTME_TARGET    = 1,
0010     PCONFIG_TARGET_NR
0011 };
0012
0013 int pconfig_target_supported(enum pconfig_target target);
0014
0015 enum pconfig_leaf {
0016     MKTME_KEY_PROGRAM   = 0,
0017     PCONFIG_LEAF_INVALID,
0018 };
0019
0020 #define PCONFIG ".byte 0x0f, 0x01, 0xc5"
0021
0022 /* Defines and structure for MKTME_KEY_PROGRAM of PCONFIG instruction */
0023
0024 /* mktme_key_program::keyid_ctrl COMMAND, bits [7:0] */
0025 #define MKTME_KEYID_SET_KEY_DIRECT  0
0026 #define MKTME_KEYID_SET_KEY_RANDOM  1
0027 #define MKTME_KEYID_CLEAR_KEY       2
0028 #define MKTME_KEYID_NO_ENCRYPT      3
0029
0030 /* mktme_key_program::keyid_ctrl ENC_ALG, bits [23:8] */
0031 #define MKTME_AES_XTS_128   (1 << 8)
0032
0033 /* Return codes from the PCONFIG MKTME_KEY_PROGRAM */
0034 #define MKTME_PROG_SUCCESS  0
0035 #define MKTME_INVALID_PROG_CMD  1
0036 #define MKTME_ENTROPY_ERROR 2
0037 #define MKTME_INVALID_KEYID 3
0038 #define MKTME_INVALID_ENC_ALG   4
0039 #define MKTME_DEVICE_BUSY   5
0040
0041 /* Hardware requires the structure to be 256 byte aligned. Otherwise #GP(0). */
0042 struct mktme_key_program {
0043     u16 keyid;
0044     u32 keyid_ctrl;
0045     u8 __rsvd[58];
0046     u8 key_field_1[64];
0047     u8 key_field_2[64];
0048 } __packed __aligned(256);
0049
0050 static inline int mktme_key_program(struct mktme_key_program *key_program)
0051 {
0052     unsigned long rax = MKTME_KEY_PROGRAM;
0053
0054     if (!pconfig_target_supported(MKTME_TARGET))
0055         return -ENXIO;
0056
0057     asm volatile(PCONFIG
0058         : "=a" (rax), "=b" (key_program)
0059         : "0" (rax), "1" (key_program)
0060         : "memory", "cc");
0061
0062     return rax;
0063 }
0064
0065 #endif  /* _ASM_X86_INTEL_PCONFIG_H */