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 aligned. 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 */
66