Zephyr API Documentation 4.0.99
A Scalable Open Source RTOS
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msr.h
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1/*
2 * Copyright (c) 2019 Intel Corp.
3 * SPDX-License-Identifier: Apache-2.0
4 */
5
6#ifndef ZEPHYR_INCLUDE_ARCH_X86_MSR_H_
7#define ZEPHYR_INCLUDE_ARCH_X86_MSR_H_
8
9/*
10 * Model specific registers (MSR). Access with z_x86_msr_read/write().
11 */
12
13#define X86_TIME_STAMP_COUNTER_MSR 0x00000010
14
15#define X86_SPEC_CTRL_MSR 0x00000048
16#define X86_SPEC_CTRL_MSR_IBRS BIT(0)
17#define X86_SPEC_CTRL_MSR_SSBD BIT(2)
18
19#define X86_APIC_BASE_MSR 0x0000001b
20#define X86_APIC_BASE_MSR_X2APIC BIT(10)
21
22#define X86_MTRR_DEF_TYPE_MSR 0x000002ff
23#define X86_MTRR_DEF_TYPE_MSR_ENABLE BIT(11)
24
25#define X86_X2APIC_BASE_MSR 0x00000800 /* .. thru 0x00000BFF */
26
27#define X86_EFER_MSR 0xC0000080U
28#define X86_EFER_MSR_SCE BIT(0)
29#define X86_EFER_MSR_LME BIT(8)
30#define X86_EFER_MSR_NXE BIT(11)
31
32/* STAR 31:0 Unused in long mode
33 * 47:32 Kernel CS (SS = CS+8)
34 * 63:48 User CS (SS = CS+8)
35 */
36#define X86_STAR_MSR 0xC0000081U
37
38/* Location for system call entry point */
39#define X86_LSTAR_MSR 0xC0000082U
40
41/* Low 32 bits in this MSR are the SYSCALL mask applied to EFLAGS */
42#define X86_FMASK_MSR 0xC0000084U
43
44#define X86_FS_BASE 0xC0000100U
45#define X86_GS_BASE 0xC0000101U
46#define X86_KERNEL_GS_BASE 0xC0000102U
47
48#ifndef _ASMLANGUAGE
49#ifdef __cplusplus
50extern "C" {
51#endif
52
53/*
54 * z_x86_msr_write() is shared between 32- and 64-bit implementations, but
55 * due to ABI differences with long return values, z_x86_msr_read() is not.
56 */
57
58static inline void z_x86_msr_write(unsigned int msr, uint64_t data)
59{
60 uint32_t high = data >> 32;
61 uint32_t low = data & 0xFFFFFFFFU;
62
63 __asm__ volatile ("wrmsr" : : "c"(msr), "a"(low), "d"(high));
64}
65
66#ifdef CONFIG_X86_64
67
68static inline uint64_t z_x86_msr_read(unsigned int msr)
69{
70 union {
71 struct {
72 uint32_t lo;
74 };
75 uint64_t value;
76 } rv;
77
78 __asm__ volatile ("rdmsr" : "=a" (rv.lo), "=d" (rv.hi) : "c" (msr));
79
80 return rv.value;
81}
82
83#else
84
85static inline uint64_t z_x86_msr_read(unsigned int msr)
86{
87 uint64_t ret;
88
89 __asm__ volatile("rdmsr" : "=A" (ret) : "c" (msr));
90
91 return ret;
92}
93
94#endif
95
96#ifdef __cplusplus
97}
98#endif
99#endif /* _ASMLANGUAGE */
100
101#endif /* ZEPHYR_INCLUDE_ARCH_X86_MSR_H_ */
irp hi
Definition asm-macro-32-bit-gnu.h:10
__UINT32_TYPE__ uint32_t
Definition stdint.h:90
__UINT64_TYPE__ uint64_t
Definition stdint.h:91