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1 /*
2  * Jailhouse, a Linux-based partitioning hypervisor
3  *
4  * Copyright (c) Siemens AG, 2013
5  * Copyright (c) Valentine Sinitsyn, 2014
6  *
7  * Authors:
8  *  Jan Kiszka <jan.kiszka@siemens.com>
9  *  Valentine Sinitsyn <valentine.sinitsyn@gmail.com>
10  *
11  * This work is licensed under the terms of the GNU GPL, version 2.  See
12  * the COPYING file in the top-level directory.
13  */
14
15 #ifndef _JAILHOUSE_ASM_PROCESSOR_H
16 #define _JAILHOUSE_ASM_PROCESSOR_H
17
18 #include <jailhouse/types.h>
19
20 /* leaf 0x01, ECX */
21 #define X86_FEATURE_VMX                                 (1 << 5)
22
23 /* leaf 0x80000001, ECX */
24 #define X86_FEATURE_SVM                                 (1 << 2)
25
26 /* leaf 0x80000001, EDX */
27 #define X86_FEATURE_GBPAGES                             (1 << 26)
28 #define X86_FEATURE_RDTSCP                              (1 << 27)
29
30 /* leaf 0x8000000a, EDX */
31 #define X86_FEATURE_NP                                  (1 << 0)
32 #define X86_FEATURE_FLUSH_BY_ASID                       (1 << 6)
33 #define X86_FEATURE_DECODE_ASSISTS                      (1 << 7)
34 #define X86_FEATURE_AVIC                                (1 << 13)
35
36 #define X86_RFLAGS_VM                                   (1 << 17)
37
38 #define X86_CR0_PE                                      (1UL << 0)
39 #define X86_CR0_MP                                      (1UL << 1)
40 #define X86_CR0_TS                                      (1UL << 3)
41 #define X86_CR0_ET                                      (1UL << 4)
42 #define X86_CR0_NE                                      (1UL << 5)
43 #define X86_CR0_WP                                      (1UL << 16)
44 #define X86_CR0_NW                                      (1UL << 29)
45 #define X86_CR0_CD                                      (1UL << 30)
46 #define X86_CR0_PG                                      (1UL << 31)
47 #define X86_CR0_RESERVED                                \
48         (BIT_MASK(28, 19) |  (1UL << 17) | BIT_MASK(15, 6))
49
50 #define X86_CR4_PAE                                     (1UL << 5)
51 #define X86_CR4_VMXE                                    (1UL << 13)
52 #define X86_CR4_OSXSAVE                                 (1UL << 18)
53 #define X86_CR4_RESERVED                                \
54         (BIT_MASK(31, 22) | (1UL << 19) | (1UL << 15) | BIT_MASK(12, 11))
55
56 #define X86_XCR0_FP                                     0x00000001
57
58 #define MSR_IA32_APICBASE                               0x0000001b
59 #define MSR_IA32_FEATURE_CONTROL                        0x0000003a
60 #define MSR_IA32_PAT                                    0x00000277
61 #define MSR_IA32_SYSENTER_CS                            0x00000174
62 #define MSR_IA32_SYSENTER_ESP                           0x00000175
63 #define MSR_IA32_SYSENTER_EIP                           0x00000176
64 #define MSR_IA32_VMX_BASIC                              0x00000480
65 #define MSR_IA32_VMX_PINBASED_CTLS                      0x00000481
66 #define MSR_IA32_VMX_PROCBASED_CTLS                     0x00000482
67 #define MSR_IA32_VMX_EXIT_CTLS                          0x00000483
68 #define MSR_IA32_VMX_ENTRY_CTLS                         0x00000484
69 #define MSR_IA32_VMX_MISC                               0x00000485
70 #define MSR_IA32_VMX_CR0_FIXED0                         0x00000486
71 #define MSR_IA32_VMX_CR0_FIXED1                         0x00000487
72 #define MSR_IA32_VMX_CR4_FIXED0                         0x00000488
73 #define MSR_IA32_VMX_CR4_FIXED1                         0x00000489
74 #define MSR_IA32_VMX_PROCBASED_CTLS2                    0x0000048b
75 #define MSR_IA32_VMX_EPT_VPID_CAP                       0x0000048c
76 #define MSR_IA32_VMX_TRUE_PROCBASED_CTLS                0x0000048e
77 #define MSR_X2APIC_BASE                                 0x00000800
78 #define MSR_X2APIC_ICR                                  0x00000830
79 #define MSR_X2APIC_END                                  0x0000083f
80 #define MSR_EFER                                        0xc0000080
81 #define MSR_STAR                                        0xc0000081
82 #define MSR_LSTAR                                       0xc0000082
83 #define MSR_CSTAR                                       0xc0000083
84 #define MSR_SFMASK                                      0xc0000084
85 #define MSR_FS_BASE                                     0xc0000100
86 #define MSR_GS_BASE                                     0xc0000101
87 #define MSR_KERNGS_BASE                                 0xc0000102
88
89 #define FEATURE_CONTROL_LOCKED                          (1 << 0)
90 #define FEATURE_CONTROL_VMXON_ENABLED_OUTSIDE_SMX       (1 << 2)
91
92 #define EFER_LME                                        0x00000100
93 #define EFER_LMA                                        0x00000400
94 #define EFER_NXE                                        0x00000800
95
96 #define GDT_DESC_NULL                                   0
97 #define GDT_DESC_CODE                                   1
98 #define GDT_DESC_TSS                                    2
99 #define GDT_DESC_TSS_HI                                 3
100 #define NUM_GDT_DESC                                    4
101
102 #define X86_INST_LEN_CPUID                              2
103 #define X86_INST_LEN_RDMSR                              2
104 #define X86_INST_LEN_WRMSR                              2
105 /* This covers both VMCALL and VMMCALL */
106 #define X86_INST_LEN_HYPERCALL                          3
107 #define X86_INST_LEN_MOV_TO_CR                          3
108 #define X86_INST_LEN_XSETBV                             3
109
110 #define X86_REX_CODE                                    4
111
112 #define X86_OP_MOV_TO_MEM                               0x89
113 #define X86_OP_MOV_FROM_MEM                             0x8b
114
115 #define NMI_VECTOR                                      2
116 #define PF_VECTOR                                       14
117
118 #define DESC_TSS_BUSY                                   (1UL << (9 + 32))
119 #define DESC_PRESENT                                    (1UL << (15 + 32))
120 #define DESC_CODE_DATA                                  (1UL << (12 + 32))
121 #define DESC_PAGE_GRAN                                  (1UL << (23 + 32))
122
123 #ifndef __ASSEMBLY__
124
125 /**
126  * @ingroup X86
127  * @defgroup Processor Processor
128  *
129  * Low-level support for x86 processor configuration and status retrieval.
130  *
131  * @{
132  */
133
134 struct registers {
135         unsigned long r15;
136         unsigned long r14;
137         unsigned long r13;
138         unsigned long r12;
139         unsigned long r11;
140         unsigned long r10;
141         unsigned long r9;
142         unsigned long r8;
143         unsigned long rdi;
144         unsigned long rsi;
145         unsigned long rbp;
146         unsigned long unused;
147         unsigned long rbx;
148         unsigned long rdx;
149         unsigned long rcx;
150         unsigned long rax;
151 };
152
153 struct desc_table_reg {
154         u16 limit;
155         u64 base;
156 } __attribute__((packed));
157
158 struct segment {
159         u64 base;
160         u32 limit;
161         u32 access_rights;
162         u16 selector;
163 };
164
165 static unsigned long __force_order;
166
167 static inline void cpu_relax(void)
168 {
169         asm volatile("rep; nop" : : : "memory");
170 }
171
172 static inline void memory_barrier(void)
173 {
174         asm volatile("mfence" : : : "memory");
175 }
176
177 static inline void memory_load_barrier(void)
178 {
179         asm volatile("lfence" : : : "memory");
180 }
181
182 static inline void __cpuid(unsigned int *eax, unsigned int *ebx,
183                            unsigned int *ecx, unsigned int *edx)
184 {
185         /* ecx is often an input as well as an output. */
186         asm volatile("cpuid"
187             : "=a" (*eax), "=b" (*ebx), "=c" (*ecx), "=d" (*edx)
188             : "0" (*eax), "2" (*ecx)
189             : "memory");
190 }
191
192 static inline void cpuid(unsigned int op, unsigned int *eax, unsigned int *ebx,
193                          unsigned int *ecx, unsigned int *edx)
194 {
195         *eax = op;
196         *ecx = 0;
197         __cpuid(eax, ebx, ecx, edx);
198 }
199
200 #define CPUID_REG(reg)                                          \
201 static inline unsigned int cpuid_##reg(unsigned int op)         \
202 {                                                               \
203         unsigned int eax, ebx, ecx, edx;                        \
204                                                                 \
205         cpuid(op, &eax, &ebx, &ecx, &edx);                      \
206         return reg;                                             \
207 }
208
209 CPUID_REG(eax)
210 CPUID_REG(ebx)
211 CPUID_REG(ecx)
212 CPUID_REG(edx)
213
214 static inline unsigned long read_cr0(void)
215 {
216         unsigned long cr0;
217
218         asm volatile("mov %%cr0,%0" : "=r" (cr0), "=m" (__force_order));
219         return cr0;
220 }
221
222 static inline void write_cr0(unsigned long val)
223 {
224         asm volatile("mov %0,%%cr0" : : "r" (val), "m" (__force_order));
225 }
226
227 static inline unsigned long read_cr2(void)
228 {
229         unsigned long cr2;
230
231         asm volatile("mov %%cr2,%0" : "=r" (cr2), "=m" (__force_order));
232         return cr2;
233 }
234
235 static inline unsigned long read_cr3(void)
236 {
237         unsigned long cr3;
238
239         asm volatile("mov %%cr3,%0" : "=r" (cr3), "=m" (__force_order));
240         return cr3;
241 }
242
243 static inline void write_cr3(unsigned long val)
244 {
245         asm volatile("mov %0,%%cr3" : : "r" (val), "m" (__force_order));
246 }
247
248 static inline unsigned long read_cr4(void)
249 {
250         unsigned long cr4;
251
252         asm volatile("mov %%cr4,%0" : "=r" (cr4), "=m" (__force_order));
253         return cr4;
254 }
255
256 static inline void write_cr4(unsigned long val)
257 {
258         asm volatile("mov %0,%%cr4" : : "r" (val), "m" (__force_order));
259 }
260
261 static inline unsigned long read_msr(unsigned int msr)
262 {
263         u32 low, high;
264
265         asm volatile("rdmsr" : "=a" (low), "=d" (high) : "c" (msr));
266         return low | ((unsigned long)high << 32);
267 }
268
269 static inline void write_msr(unsigned int msr, unsigned long val)
270 {
271         asm volatile("wrmsr"
272                 : /* no output */
273                 : "c" (msr), "a" (val), "d" (val >> 32)
274                 : "memory");
275 }
276
277 static inline void read_gdtr(struct desc_table_reg *val)
278 {
279         asm volatile("sgdtq %0" : "=m" (*val));
280 }
281
282 static inline void write_gdtr(struct desc_table_reg *val)
283 {
284         asm volatile("lgdtq %0" : : "m" (*val));
285 }
286
287 static inline void read_idtr(struct desc_table_reg *val)
288 {
289         asm volatile("sidtq %0" : "=m" (*val));
290 }
291
292 static inline void write_idtr(struct desc_table_reg *val)
293 {
294         asm volatile("lidtq %0" : : "m" (*val));
295 }
296
297 /**
298  * Enable or disable interrupts delivery to the local CPU when in host mode.
299  *
300  * In some cases (AMD) changing IF isn't enough, so these are implemented on
301  * per-vendor basis.
302  * @{
303  */
304 void enable_irq(void);
305
306 void disable_irq(void);
307 /** @} */
308
309 /** @} */
310 #endif /* !__ASSEMBLY__ */
311
312 #endif /* !_JAILHOUSE_ASM_PROCESSOR_H */