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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1965aae3 PA |
2 | #ifndef _ASM_X86_PROCESSOR_H |
3 | #define _ASM_X86_PROCESSOR_H | |
c758ecf6 | 4 | |
053de044 GOC |
5 | #include <asm/processor-flags.h> |
6 | ||
683e0253 GOC |
7 | /* Forward declaration, a strange C thing */ |
8 | struct task_struct; | |
9 | struct mm_struct; | |
9fda6a06 | 10 | struct vm86; |
683e0253 | 11 | |
2f66dcc9 GOC |
12 | #include <asm/math_emu.h> |
13 | #include <asm/segment.h> | |
2f66dcc9 | 14 | #include <asm/types.h> |
decb4c41 | 15 | #include <uapi/asm/sigcontext.h> |
2f66dcc9 | 16 | #include <asm/current.h> |
cd4d09ec | 17 | #include <asm/cpufeatures.h> |
2f66dcc9 | 18 | #include <asm/page.h> |
54321d94 | 19 | #include <asm/pgtable_types.h> |
5300db88 | 20 | #include <asm/percpu.h> |
2f66dcc9 GOC |
21 | #include <asm/msr.h> |
22 | #include <asm/desc_defs.h> | |
bd61643e | 23 | #include <asm/nops.h> |
f05e798a | 24 | #include <asm/special_insns.h> |
14b9675a | 25 | #include <asm/fpu/types.h> |
76846bf3 | 26 | #include <asm/unwind_hints.h> |
4d46a89e | 27 | |
2f66dcc9 | 28 | #include <linux/personality.h> |
5300db88 | 29 | #include <linux/cache.h> |
2f66dcc9 | 30 | #include <linux/threads.h> |
5cbc19a9 | 31 | #include <linux/math64.h> |
faa4602e | 32 | #include <linux/err.h> |
f05e798a | 33 | #include <linux/irqflags.h> |
21729f81 | 34 | #include <linux/mem_encrypt.h> |
f05e798a DH |
35 | |
36 | /* | |
37 | * We handle most unaligned accesses in hardware. On the other hand | |
38 | * unaligned DMA can be quite expensive on some Nehalem processors. | |
39 | * | |
40 | * Based on this we disable the IP header alignment in network drivers. | |
41 | */ | |
42 | #define NET_IP_ALIGN 0 | |
c72dcf83 | 43 | |
b332828c | 44 | #define HBP_NUM 4 |
0ccb8acc GOC |
45 | /* |
46 | * Default implementation of macro that returns current | |
47 | * instruction pointer ("program counter"). | |
48 | */ | |
49 | static inline void *current_text_addr(void) | |
50 | { | |
51 | void *pc; | |
4d46a89e IM |
52 | |
53 | asm volatile("mov $1f, %0; 1:":"=r" (pc)); | |
54 | ||
0ccb8acc GOC |
55 | return pc; |
56 | } | |
57 | ||
b8c1b8ea IM |
58 | /* |
59 | * These alignment constraints are for performance in the vSMP case, | |
60 | * but in the task_struct case we must also meet hardware imposed | |
61 | * alignment requirements of the FPU state: | |
62 | */ | |
dbcb4660 | 63 | #ifdef CONFIG_X86_VSMP |
4d46a89e IM |
64 | # define ARCH_MIN_TASKALIGN (1 << INTERNODE_CACHE_SHIFT) |
65 | # define ARCH_MIN_MMSTRUCT_ALIGN (1 << INTERNODE_CACHE_SHIFT) | |
dbcb4660 | 66 | #else |
b8c1b8ea | 67 | # define ARCH_MIN_TASKALIGN __alignof__(union fpregs_state) |
4d46a89e | 68 | # define ARCH_MIN_MMSTRUCT_ALIGN 0 |
dbcb4660 GOC |
69 | #endif |
70 | ||
e0ba94f1 AS |
71 | enum tlb_infos { |
72 | ENTRIES, | |
73 | NR_INFO | |
74 | }; | |
75 | ||
76 | extern u16 __read_mostly tlb_lli_4k[NR_INFO]; | |
77 | extern u16 __read_mostly tlb_lli_2m[NR_INFO]; | |
78 | extern u16 __read_mostly tlb_lli_4m[NR_INFO]; | |
79 | extern u16 __read_mostly tlb_lld_4k[NR_INFO]; | |
80 | extern u16 __read_mostly tlb_lld_2m[NR_INFO]; | |
81 | extern u16 __read_mostly tlb_lld_4m[NR_INFO]; | |
dd360393 | 82 | extern u16 __read_mostly tlb_lld_1g[NR_INFO]; |
c4211f42 | 83 | |
5300db88 GOC |
84 | /* |
85 | * CPU type and hardware bug flags. Kept separately for each CPU. | |
04402116 | 86 | * Members of this structure are referenced in head_32.S, so think twice |
5300db88 GOC |
87 | * before touching them. [mj] |
88 | */ | |
89 | ||
90 | struct cpuinfo_x86 { | |
4d46a89e IM |
91 | __u8 x86; /* CPU family */ |
92 | __u8 x86_vendor; /* CPU vendor */ | |
93 | __u8 x86_model; | |
b399151c | 94 | __u8 x86_stepping; |
6415813b | 95 | #ifdef CONFIG_X86_64 |
4d46a89e | 96 | /* Number of 4K pages in DTLB/ITLB combined(in pages): */ |
b1882e68 | 97 | int x86_tlbsize; |
13c6c532 | 98 | #endif |
4d46a89e IM |
99 | __u8 x86_virt_bits; |
100 | __u8 x86_phys_bits; | |
101 | /* CPUID returned core id bits: */ | |
102 | __u8 x86_coreid_bits; | |
79a8b9aa | 103 | __u8 cu_id; |
4d46a89e IM |
104 | /* Max extended CPUID function supported: */ |
105 | __u32 extended_cpuid_level; | |
4d46a89e IM |
106 | /* Maximum supported CPUID level, -1=no CPUID: */ |
107 | int cpuid_level; | |
65fc985b | 108 | __u32 x86_capability[NCAPINTS + NBUGINTS]; |
4d46a89e IM |
109 | char x86_vendor_id[16]; |
110 | char x86_model_id[64]; | |
111 | /* in KB - valid for CPUS which support this call: */ | |
24dbc600 | 112 | unsigned int x86_cache_size; |
4d46a89e | 113 | int x86_cache_alignment; /* In bytes */ |
cbc82b17 PWJ |
114 | /* Cache QoS architectural values: */ |
115 | int x86_cache_max_rmid; /* max index */ | |
116 | int x86_cache_occ_scale; /* scale to bytes */ | |
4d46a89e IM |
117 | int x86_power; |
118 | unsigned long loops_per_jiffy; | |
4d46a89e IM |
119 | /* cpuid returned max cores value: */ |
120 | u16 x86_max_cores; | |
121 | u16 apicid; | |
01aaea1a | 122 | u16 initial_apicid; |
4d46a89e | 123 | u16 x86_clflush_size; |
4d46a89e IM |
124 | /* number of cores as seen by the OS: */ |
125 | u16 booted_cores; | |
126 | /* Physical processor id: */ | |
127 | u16 phys_proc_id; | |
1f12e32f TG |
128 | /* Logical processor id: */ |
129 | u16 logical_proc_id; | |
4d46a89e IM |
130 | /* Core id: */ |
131 | u16 cpu_core_id; | |
132 | /* Index into per_cpu list: */ | |
133 | u16 cpu_index; | |
506ed6b5 | 134 | u32 microcode; |
cc51e542 AK |
135 | /* Address space bits used by the cache internally */ |
136 | u8 x86_cache_bits; | |
30bb9811 | 137 | unsigned initialized : 1; |
3859a271 | 138 | } __randomize_layout; |
5300db88 | 139 | |
47f10a36 HC |
140 | struct cpuid_regs { |
141 | u32 eax, ebx, ecx, edx; | |
142 | }; | |
143 | ||
144 | enum cpuid_regs_idx { | |
145 | CPUID_EAX = 0, | |
146 | CPUID_EBX, | |
147 | CPUID_ECX, | |
148 | CPUID_EDX, | |
149 | }; | |
150 | ||
4d46a89e IM |
151 | #define X86_VENDOR_INTEL 0 |
152 | #define X86_VENDOR_CYRIX 1 | |
153 | #define X86_VENDOR_AMD 2 | |
154 | #define X86_VENDOR_UMC 3 | |
4d46a89e IM |
155 | #define X86_VENDOR_CENTAUR 5 |
156 | #define X86_VENDOR_TRANSMETA 7 | |
157 | #define X86_VENDOR_NSC 8 | |
158 | #define X86_VENDOR_NUM 9 | |
159 | ||
160 | #define X86_VENDOR_UNKNOWN 0xff | |
5300db88 | 161 | |
1a53905a GOC |
162 | /* |
163 | * capabilities of CPUs | |
164 | */ | |
4d46a89e IM |
165 | extern struct cpuinfo_x86 boot_cpu_data; |
166 | extern struct cpuinfo_x86 new_cpu_data; | |
167 | ||
7fb983b4 | 168 | extern struct x86_hw_tss doublefault_tss; |
6cbd2171 TG |
169 | extern __u32 cpu_caps_cleared[NCAPINTS + NBUGINTS]; |
170 | extern __u32 cpu_caps_set[NCAPINTS + NBUGINTS]; | |
5300db88 GOC |
171 | |
172 | #ifdef CONFIG_SMP | |
2c773dd3 | 173 | DECLARE_PER_CPU_READ_MOSTLY(struct cpuinfo_x86, cpu_info); |
5300db88 | 174 | #define cpu_data(cpu) per_cpu(cpu_info, cpu) |
5300db88 | 175 | #else |
7b543a53 | 176 | #define cpu_info boot_cpu_data |
5300db88 | 177 | #define cpu_data(cpu) boot_cpu_data |
5300db88 GOC |
178 | #endif |
179 | ||
1c6c727d JS |
180 | extern const struct seq_operations cpuinfo_op; |
181 | ||
4d46a89e IM |
182 | #define cache_line_size() (boot_cpu_data.x86_cache_alignment) |
183 | ||
184 | extern void cpu_detect(struct cpuinfo_x86 *c); | |
1a53905a | 185 | |
9df95169 | 186 | static inline unsigned long long l1tf_pfn_limit(void) |
17dbca11 | 187 | { |
cc51e542 | 188 | return BIT_ULL(boot_cpu_data.x86_cache_bits - 1 - PAGE_SHIFT); |
17dbca11 AK |
189 | } |
190 | ||
f580366f | 191 | extern void early_cpu_init(void); |
1a53905a GOC |
192 | extern void identify_boot_cpu(void); |
193 | extern void identify_secondary_cpu(struct cpuinfo_x86 *); | |
5300db88 | 194 | extern void print_cpu_info(struct cpuinfo_x86 *); |
21c3fcf3 | 195 | void print_cpu_msr(struct cpuinfo_x86 *); |
1a53905a | 196 | |
d288e1cf FY |
197 | #ifdef CONFIG_X86_32 |
198 | extern int have_cpuid_p(void); | |
199 | #else | |
200 | static inline int have_cpuid_p(void) | |
201 | { | |
202 | return 1; | |
203 | } | |
204 | #endif | |
c758ecf6 | 205 | static inline void native_cpuid(unsigned int *eax, unsigned int *ebx, |
4d46a89e | 206 | unsigned int *ecx, unsigned int *edx) |
c758ecf6 GOC |
207 | { |
208 | /* ecx is often an input as well as an output. */ | |
45a94d7c | 209 | asm volatile("cpuid" |
cca2e6f8 JP |
210 | : "=a" (*eax), |
211 | "=b" (*ebx), | |
212 | "=c" (*ecx), | |
213 | "=d" (*edx) | |
506ed6b5 AK |
214 | : "0" (*eax), "2" (*ecx) |
215 | : "memory"); | |
c758ecf6 GOC |
216 | } |
217 | ||
5dedade6 BP |
218 | #define native_cpuid_reg(reg) \ |
219 | static inline unsigned int native_cpuid_##reg(unsigned int op) \ | |
220 | { \ | |
221 | unsigned int eax = op, ebx, ecx = 0, edx; \ | |
222 | \ | |
223 | native_cpuid(&eax, &ebx, &ecx, &edx); \ | |
224 | \ | |
225 | return reg; \ | |
226 | } | |
227 | ||
228 | /* | |
229 | * Native CPUID functions returning a single datum. | |
230 | */ | |
231 | native_cpuid_reg(eax) | |
232 | native_cpuid_reg(ebx) | |
233 | native_cpuid_reg(ecx) | |
234 | native_cpuid_reg(edx) | |
235 | ||
6c690ee1 AL |
236 | /* |
237 | * Friendlier CR3 helpers. | |
238 | */ | |
239 | static inline unsigned long read_cr3_pa(void) | |
240 | { | |
241 | return __read_cr3() & CR3_ADDR_MASK; | |
242 | } | |
243 | ||
eef9c4ab TL |
244 | static inline unsigned long native_read_cr3_pa(void) |
245 | { | |
246 | return __native_read_cr3() & CR3_ADDR_MASK; | |
247 | } | |
248 | ||
c72dcf83 GOC |
249 | static inline void load_cr3(pgd_t *pgdir) |
250 | { | |
21729f81 | 251 | write_cr3(__sme_pa(pgdir)); |
c72dcf83 | 252 | } |
c758ecf6 | 253 | |
7fb983b4 AL |
254 | /* |
255 | * Note that while the legacy 'TSS' name comes from 'Task State Segment', | |
256 | * on modern x86 CPUs the TSS also holds information important to 64-bit mode, | |
257 | * unrelated to the task-switch mechanism: | |
258 | */ | |
ca241c75 GOC |
259 | #ifdef CONFIG_X86_32 |
260 | /* This is the TSS defined by the hardware. */ | |
261 | struct x86_hw_tss { | |
4d46a89e IM |
262 | unsigned short back_link, __blh; |
263 | unsigned long sp0; | |
264 | unsigned short ss0, __ss0h; | |
cf9328cc | 265 | unsigned long sp1; |
76e4c490 AL |
266 | |
267 | /* | |
cf9328cc AL |
268 | * We don't use ring 1, so ss1 is a convenient scratch space in |
269 | * the same cacheline as sp0. We use ss1 to cache the value in | |
270 | * MSR_IA32_SYSENTER_CS. When we context switch | |
271 | * MSR_IA32_SYSENTER_CS, we first check if the new value being | |
272 | * written matches ss1, and, if it's not, then we wrmsr the new | |
273 | * value and update ss1. | |
76e4c490 | 274 | * |
cf9328cc AL |
275 | * The only reason we context switch MSR_IA32_SYSENTER_CS is |
276 | * that we set it to zero in vm86 tasks to avoid corrupting the | |
277 | * stack if we were to go through the sysenter path from vm86 | |
278 | * mode. | |
76e4c490 | 279 | */ |
76e4c490 AL |
280 | unsigned short ss1; /* MSR_IA32_SYSENTER_CS */ |
281 | ||
282 | unsigned short __ss1h; | |
4d46a89e IM |
283 | unsigned long sp2; |
284 | unsigned short ss2, __ss2h; | |
285 | unsigned long __cr3; | |
286 | unsigned long ip; | |
287 | unsigned long flags; | |
288 | unsigned long ax; | |
289 | unsigned long cx; | |
290 | unsigned long dx; | |
291 | unsigned long bx; | |
292 | unsigned long sp; | |
293 | unsigned long bp; | |
294 | unsigned long si; | |
295 | unsigned long di; | |
296 | unsigned short es, __esh; | |
297 | unsigned short cs, __csh; | |
298 | unsigned short ss, __ssh; | |
299 | unsigned short ds, __dsh; | |
300 | unsigned short fs, __fsh; | |
301 | unsigned short gs, __gsh; | |
302 | unsigned short ldt, __ldth; | |
303 | unsigned short trace; | |
304 | unsigned short io_bitmap_base; | |
305 | ||
ca241c75 GOC |
306 | } __attribute__((packed)); |
307 | #else | |
308 | struct x86_hw_tss { | |
4d46a89e IM |
309 | u32 reserved1; |
310 | u64 sp0; | |
9aaefe7b AL |
311 | |
312 | /* | |
313 | * We store cpu_current_top_of_stack in sp1 so it's always accessible. | |
314 | * Linux does not use ring 1, so sp1 is not otherwise needed. | |
315 | */ | |
4d46a89e | 316 | u64 sp1; |
9aaefe7b | 317 | |
4d46a89e IM |
318 | u64 sp2; |
319 | u64 reserved2; | |
320 | u64 ist[7]; | |
321 | u32 reserved3; | |
322 | u32 reserved4; | |
323 | u16 reserved5; | |
324 | u16 io_bitmap_base; | |
325 | ||
d3273dea | 326 | } __attribute__((packed)); |
ca241c75 GOC |
327 | #endif |
328 | ||
329 | /* | |
4d46a89e | 330 | * IO-bitmap sizes: |
ca241c75 | 331 | */ |
4d46a89e IM |
332 | #define IO_BITMAP_BITS 65536 |
333 | #define IO_BITMAP_BYTES (IO_BITMAP_BITS/8) | |
334 | #define IO_BITMAP_LONGS (IO_BITMAP_BYTES/sizeof(long)) | |
7fb983b4 | 335 | #define IO_BITMAP_OFFSET (offsetof(struct tss_struct, io_bitmap) - offsetof(struct tss_struct, x86_tss)) |
4d46a89e | 336 | #define INVALID_IO_BITMAP_OFFSET 0x8000 |
ca241c75 | 337 | |
4fe2d8b1 | 338 | struct entry_stack { |
0f9a4810 AL |
339 | unsigned long words[64]; |
340 | }; | |
341 | ||
4fe2d8b1 DH |
342 | struct entry_stack_page { |
343 | struct entry_stack stack; | |
c482feef | 344 | } __aligned(PAGE_SIZE); |
1a935bc3 | 345 | |
ca241c75 | 346 | struct tss_struct { |
4d46a89e | 347 | /* |
1a935bc3 AL |
348 | * The fixed hardware portion. This must not cross a page boundary |
349 | * at risk of violating the SDM's advice and potentially triggering | |
350 | * errata. | |
4d46a89e IM |
351 | */ |
352 | struct x86_hw_tss x86_tss; | |
ca241c75 GOC |
353 | |
354 | /* | |
355 | * The extra 1 is there because the CPU will access an | |
356 | * additional byte beyond the end of the IO permission | |
357 | * bitmap. The extra byte must be all 1 bits, and must | |
358 | * be within the limit. | |
359 | */ | |
4d46a89e | 360 | unsigned long io_bitmap[IO_BITMAP_LONGS + 1]; |
1a935bc3 | 361 | } __aligned(PAGE_SIZE); |
4d46a89e | 362 | |
c482feef | 363 | DECLARE_PER_CPU_PAGE_ALIGNED(struct tss_struct, cpu_tss_rw); |
ca241c75 | 364 | |
4f53ab14 AL |
365 | /* |
366 | * sizeof(unsigned long) coming from an extra "long" at the end | |
367 | * of the iobitmap. | |
368 | * | |
369 | * -1? seg base+limit should be pointing to the address of the | |
370 | * last valid byte | |
371 | */ | |
372 | #define __KERNEL_TSS_LIMIT \ | |
373 | (IO_BITMAP_OFFSET + IO_BITMAP_BYTES + sizeof(unsigned long) - 1) | |
374 | ||
a7fcf28d AL |
375 | #ifdef CONFIG_X86_32 |
376 | DECLARE_PER_CPU(unsigned long, cpu_current_top_of_stack); | |
9aaefe7b | 377 | #else |
c482feef AL |
378 | /* The RO copy can't be accessed with this_cpu_xyz(), so use the RW copy. */ |
379 | #define cpu_current_top_of_stack cpu_tss_rw.x86_tss.sp1 | |
a7fcf28d AL |
380 | #endif |
381 | ||
4d46a89e IM |
382 | /* |
383 | * Save the original ist values for checking stack pointers during debugging | |
384 | */ | |
1a53905a | 385 | struct orig_ist { |
4d46a89e | 386 | unsigned long ist[7]; |
1a53905a GOC |
387 | }; |
388 | ||
fe676203 | 389 | #ifdef CONFIG_X86_64 |
2f66dcc9 | 390 | DECLARE_PER_CPU(struct orig_ist, orig_ist); |
26f80bd6 | 391 | |
947e76cd BG |
392 | union irq_stack_union { |
393 | char irq_stack[IRQ_STACK_SIZE]; | |
394 | /* | |
395 | * GCC hardcodes the stack canary as %gs:40. Since the | |
396 | * irq_stack is the object at %gs:0, we reserve the bottom | |
397 | * 48 bytes of the irq stack for the canary. | |
398 | */ | |
399 | struct { | |
400 | char gs_base[40]; | |
401 | unsigned long stack_canary; | |
402 | }; | |
403 | }; | |
404 | ||
277d5b40 | 405 | DECLARE_PER_CPU_FIRST(union irq_stack_union, irq_stack_union) __visible; |
2add8e23 BG |
406 | DECLARE_INIT_PER_CPU(irq_stack_union); |
407 | ||
35060ed6 VK |
408 | static inline unsigned long cpu_kernelmode_gs_base(int cpu) |
409 | { | |
410 | return (unsigned long)per_cpu(irq_stack_union.gs_base, cpu); | |
411 | } | |
412 | ||
26f80bd6 | 413 | DECLARE_PER_CPU(char *, irq_stack_ptr); |
9766cdbc | 414 | DECLARE_PER_CPU(unsigned int, irq_count); |
9766cdbc | 415 | extern asmlinkage void ignore_sysret(void); |
42b933b5 VK |
416 | |
417 | #if IS_ENABLED(CONFIG_KVM) | |
418 | /* Save actual FS/GS selectors and bases to current->thread */ | |
419 | void save_fsgs_for_kvm(void); | |
420 | #endif | |
60a5317f | 421 | #else /* X86_64 */ |
050e9baa | 422 | #ifdef CONFIG_STACKPROTECTOR |
1ea0d14e JF |
423 | /* |
424 | * Make sure stack canary segment base is cached-aligned: | |
425 | * "For Intel Atom processors, avoid non zero segment base address | |
426 | * that is not aligned to cache line boundary at all cost." | |
427 | * (Optim Ref Manual Assembly/Compiler Coding Rule 15.) | |
428 | */ | |
429 | struct stack_canary { | |
430 | char __pad[20]; /* canary at %gs:20 */ | |
431 | unsigned long canary; | |
432 | }; | |
53f82452 | 433 | DECLARE_PER_CPU_ALIGNED(struct stack_canary, stack_canary); |
96a388de | 434 | #endif |
198d208d SR |
435 | /* |
436 | * per-CPU IRQ handling stacks | |
437 | */ | |
438 | struct irq_stack { | |
439 | u32 stack[THREAD_SIZE/sizeof(u32)]; | |
440 | } __aligned(THREAD_SIZE); | |
441 | ||
442 | DECLARE_PER_CPU(struct irq_stack *, hardirq_stack); | |
443 | DECLARE_PER_CPU(struct irq_stack *, softirq_stack); | |
60a5317f | 444 | #endif /* X86_64 */ |
c758ecf6 | 445 | |
bf15a8cf | 446 | extern unsigned int fpu_kernel_xstate_size; |
a1141e0b | 447 | extern unsigned int fpu_user_xstate_size; |
683e0253 | 448 | |
24f1e32c FW |
449 | struct perf_event; |
450 | ||
13d4ea09 AL |
451 | typedef struct { |
452 | unsigned long seg; | |
453 | } mm_segment_t; | |
454 | ||
cb38d377 | 455 | struct thread_struct { |
4d46a89e IM |
456 | /* Cached TLS descriptors: */ |
457 | struct desc_struct tls_array[GDT_ENTRY_TLS_ENTRIES]; | |
d375cf15 | 458 | #ifdef CONFIG_X86_32 |
4d46a89e | 459 | unsigned long sp0; |
d375cf15 | 460 | #endif |
4d46a89e | 461 | unsigned long sp; |
cb38d377 | 462 | #ifdef CONFIG_X86_32 |
4d46a89e | 463 | unsigned long sysenter_cs; |
cb38d377 | 464 | #else |
4d46a89e IM |
465 | unsigned short es; |
466 | unsigned short ds; | |
467 | unsigned short fsindex; | |
468 | unsigned short gsindex; | |
cb38d377 | 469 | #endif |
b9d989c7 | 470 | |
d756f4ad | 471 | #ifdef CONFIG_X86_64 |
296f781a AL |
472 | unsigned long fsbase; |
473 | unsigned long gsbase; | |
474 | #else | |
475 | /* | |
476 | * XXX: this could presumably be unsigned short. Alternatively, | |
477 | * 32-bit kernels could be taught to use fsindex instead. | |
478 | */ | |
479 | unsigned long fs; | |
480 | unsigned long gs; | |
d756f4ad | 481 | #endif |
c5bedc68 | 482 | |
24f1e32c FW |
483 | /* Save middle states of ptrace breakpoints */ |
484 | struct perf_event *ptrace_bps[HBP_NUM]; | |
485 | /* Debug status used for traps, single steps, etc... */ | |
486 | unsigned long debugreg6; | |
326264a0 FW |
487 | /* Keep track of the exact dr7 value set by the user */ |
488 | unsigned long ptrace_dr7; | |
4d46a89e IM |
489 | /* Fault info: */ |
490 | unsigned long cr2; | |
51e7dc70 | 491 | unsigned long trap_nr; |
4d46a89e | 492 | unsigned long error_code; |
9fda6a06 | 493 | #ifdef CONFIG_VM86 |
4d46a89e | 494 | /* Virtual 86 mode info */ |
9fda6a06 | 495 | struct vm86 *vm86; |
cb38d377 | 496 | #endif |
4d46a89e IM |
497 | /* IO permissions: */ |
498 | unsigned long *io_bitmap_ptr; | |
499 | unsigned long iopl; | |
500 | /* Max allowed port in the bitmap, in bytes: */ | |
501 | unsigned io_bitmap_max; | |
0c8c0f03 | 502 | |
13d4ea09 AL |
503 | mm_segment_t addr_limit; |
504 | ||
2a53ccbc | 505 | unsigned int sig_on_uaccess_err:1; |
dfa9a942 AL |
506 | unsigned int uaccess_err:1; /* uaccess failed */ |
507 | ||
0c8c0f03 DH |
508 | /* Floating point and extended processor state */ |
509 | struct fpu fpu; | |
510 | /* | |
511 | * WARNING: 'fpu' is dynamically-sized. It *MUST* be at | |
512 | * the end. | |
513 | */ | |
cb38d377 GOC |
514 | }; |
515 | ||
f7d83c1c KC |
516 | /* Whitelist the FPU state from the task_struct for hardened usercopy. */ |
517 | static inline void arch_thread_struct_whitelist(unsigned long *offset, | |
518 | unsigned long *size) | |
519 | { | |
520 | *offset = offsetof(struct thread_struct, fpu.state); | |
521 | *size = fpu_kernel_xstate_size; | |
522 | } | |
523 | ||
b9d989c7 AL |
524 | /* |
525 | * Thread-synchronous status. | |
526 | * | |
527 | * This is different from the flags in that nobody else | |
528 | * ever touches our thread-synchronous status, so we don't | |
529 | * have to worry about atomic accesses. | |
530 | */ | |
531 | #define TS_COMPAT 0x0002 /* 32bit syscall active (64BIT)*/ | |
532 | ||
62d7d7ed GOC |
533 | /* |
534 | * Set IOPL bits in EFLAGS from given mask | |
535 | */ | |
536 | static inline void native_set_iopl_mask(unsigned mask) | |
537 | { | |
538 | #ifdef CONFIG_X86_32 | |
539 | unsigned int reg; | |
4d46a89e | 540 | |
cca2e6f8 JP |
541 | asm volatile ("pushfl;" |
542 | "popl %0;" | |
543 | "andl %1, %0;" | |
544 | "orl %2, %0;" | |
545 | "pushl %0;" | |
546 | "popfl" | |
547 | : "=&r" (reg) | |
548 | : "i" (~X86_EFLAGS_IOPL), "r" (mask)); | |
62d7d7ed GOC |
549 | #endif |
550 | } | |
551 | ||
4d46a89e | 552 | static inline void |
da51da18 | 553 | native_load_sp0(unsigned long sp0) |
7818a1e0 | 554 | { |
c482feef | 555 | this_cpu_write(cpu_tss_rw.x86_tss.sp0, sp0); |
7818a1e0 | 556 | } |
1b46cbe0 | 557 | |
e801f864 GOC |
558 | static inline void native_swapgs(void) |
559 | { | |
560 | #ifdef CONFIG_X86_64 | |
561 | asm volatile("swapgs" ::: "memory"); | |
562 | #endif | |
563 | } | |
564 | ||
a7fcf28d | 565 | static inline unsigned long current_top_of_stack(void) |
8ef46a67 | 566 | { |
9aaefe7b AL |
567 | /* |
568 | * We can't read directly from tss.sp0: sp0 on x86_32 is special in | |
569 | * and around vm86 mode and sp0 on x86_64 is special because of the | |
570 | * entry trampoline. | |
571 | */ | |
a7fcf28d | 572 | return this_cpu_read_stable(cpu_current_top_of_stack); |
8ef46a67 AL |
573 | } |
574 | ||
3383642c AL |
575 | static inline bool on_thread_stack(void) |
576 | { | |
577 | return (unsigned long)(current_top_of_stack() - | |
578 | current_stack_pointer) < THREAD_SIZE; | |
579 | } | |
580 | ||
9bad5658 | 581 | #ifdef CONFIG_PARAVIRT_XXL |
7818a1e0 GOC |
582 | #include <asm/paravirt.h> |
583 | #else | |
4d46a89e | 584 | #define __cpuid native_cpuid |
1b46cbe0 | 585 | |
da51da18 | 586 | static inline void load_sp0(unsigned long sp0) |
7818a1e0 | 587 | { |
da51da18 | 588 | native_load_sp0(sp0); |
7818a1e0 GOC |
589 | } |
590 | ||
62d7d7ed | 591 | #define set_iopl_mask native_set_iopl_mask |
9bad5658 | 592 | #endif /* CONFIG_PARAVIRT_XXL */ |
1b46cbe0 | 593 | |
683e0253 GOC |
594 | /* Free all resources held by a thread. */ |
595 | extern void release_thread(struct task_struct *); | |
596 | ||
683e0253 | 597 | unsigned long get_wchan(struct task_struct *p); |
c758ecf6 GOC |
598 | |
599 | /* | |
600 | * Generic CPUID function | |
601 | * clear %ecx since some cpus (Cyrix MII) do not set or clear %ecx | |
602 | * resulting in stale register contents being returned. | |
603 | */ | |
604 | static inline void cpuid(unsigned int op, | |
605 | unsigned int *eax, unsigned int *ebx, | |
606 | unsigned int *ecx, unsigned int *edx) | |
607 | { | |
608 | *eax = op; | |
609 | *ecx = 0; | |
610 | __cpuid(eax, ebx, ecx, edx); | |
611 | } | |
612 | ||
613 | /* Some CPUID calls want 'count' to be placed in ecx */ | |
614 | static inline void cpuid_count(unsigned int op, int count, | |
615 | unsigned int *eax, unsigned int *ebx, | |
616 | unsigned int *ecx, unsigned int *edx) | |
617 | { | |
618 | *eax = op; | |
619 | *ecx = count; | |
620 | __cpuid(eax, ebx, ecx, edx); | |
621 | } | |
622 | ||
623 | /* | |
624 | * CPUID functions returning a single datum | |
625 | */ | |
626 | static inline unsigned int cpuid_eax(unsigned int op) | |
627 | { | |
628 | unsigned int eax, ebx, ecx, edx; | |
629 | ||
630 | cpuid(op, &eax, &ebx, &ecx, &edx); | |
4d46a89e | 631 | |
c758ecf6 GOC |
632 | return eax; |
633 | } | |
4d46a89e | 634 | |
c758ecf6 GOC |
635 | static inline unsigned int cpuid_ebx(unsigned int op) |
636 | { | |
637 | unsigned int eax, ebx, ecx, edx; | |
638 | ||
639 | cpuid(op, &eax, &ebx, &ecx, &edx); | |
4d46a89e | 640 | |
c758ecf6 GOC |
641 | return ebx; |
642 | } | |
4d46a89e | 643 | |
c758ecf6 GOC |
644 | static inline unsigned int cpuid_ecx(unsigned int op) |
645 | { | |
646 | unsigned int eax, ebx, ecx, edx; | |
647 | ||
648 | cpuid(op, &eax, &ebx, &ecx, &edx); | |
4d46a89e | 649 | |
c758ecf6 GOC |
650 | return ecx; |
651 | } | |
4d46a89e | 652 | |
c758ecf6 GOC |
653 | static inline unsigned int cpuid_edx(unsigned int op) |
654 | { | |
655 | unsigned int eax, ebx, ecx, edx; | |
656 | ||
657 | cpuid(op, &eax, &ebx, &ecx, &edx); | |
4d46a89e | 658 | |
c758ecf6 GOC |
659 | return edx; |
660 | } | |
661 | ||
683e0253 | 662 | /* REP NOP (PAUSE) is a good thing to insert into busy-wait loops. */ |
0b101e62 | 663 | static __always_inline void rep_nop(void) |
683e0253 | 664 | { |
cca2e6f8 | 665 | asm volatile("rep; nop" ::: "memory"); |
683e0253 GOC |
666 | } |
667 | ||
0b101e62 | 668 | static __always_inline void cpu_relax(void) |
4d46a89e IM |
669 | { |
670 | rep_nop(); | |
671 | } | |
672 | ||
c198b121 AL |
673 | /* |
674 | * This function forces the icache and prefetched instruction stream to | |
675 | * catch up with reality in two very specific cases: | |
676 | * | |
677 | * a) Text was modified using one virtual address and is about to be executed | |
678 | * from the same physical page at a different virtual address. | |
679 | * | |
680 | * b) Text was modified on a different CPU, may subsequently be | |
681 | * executed on this CPU, and you want to make sure the new version | |
682 | * gets executed. This generally means you're calling this in a IPI. | |
683 | * | |
684 | * If you're calling this for a different reason, you're probably doing | |
685 | * it wrong. | |
686 | */ | |
683e0253 GOC |
687 | static inline void sync_core(void) |
688 | { | |
45c39fb0 | 689 | /* |
c198b121 AL |
690 | * There are quite a few ways to do this. IRET-to-self is nice |
691 | * because it works on every CPU, at any CPL (so it's compatible | |
692 | * with paravirtualization), and it never exits to a hypervisor. | |
693 | * The only down sides are that it's a bit slow (it seems to be | |
694 | * a bit more than 2x slower than the fastest options) and that | |
695 | * it unmasks NMIs. The "push %cs" is needed because, in | |
696 | * paravirtual environments, __KERNEL_CS may not be a valid CS | |
697 | * value when we do IRET directly. | |
698 | * | |
699 | * In case NMI unmasking or performance ever becomes a problem, | |
700 | * the next best option appears to be MOV-to-CR2 and an | |
701 | * unconditional jump. That sequence also works on all CPUs, | |
ecda85e7 | 702 | * but it will fault at CPL3 (i.e. Xen PV). |
c198b121 AL |
703 | * |
704 | * CPUID is the conventional way, but it's nasty: it doesn't | |
705 | * exist on some 486-like CPUs, and it usually exits to a | |
706 | * hypervisor. | |
707 | * | |
708 | * Like all of Linux's memory ordering operations, this is a | |
709 | * compiler barrier as well. | |
45c39fb0 | 710 | */ |
c198b121 AL |
711 | #ifdef CONFIG_X86_32 |
712 | asm volatile ( | |
713 | "pushfl\n\t" | |
714 | "pushl %%cs\n\t" | |
715 | "pushl $1f\n\t" | |
716 | "iret\n\t" | |
717 | "1:" | |
f5caf621 | 718 | : ASM_CALL_CONSTRAINT : : "memory"); |
45c39fb0 | 719 | #else |
c198b121 AL |
720 | unsigned int tmp; |
721 | ||
722 | asm volatile ( | |
76846bf3 | 723 | UNWIND_HINT_SAVE |
c198b121 AL |
724 | "mov %%ss, %0\n\t" |
725 | "pushq %q0\n\t" | |
726 | "pushq %%rsp\n\t" | |
727 | "addq $8, (%%rsp)\n\t" | |
728 | "pushfq\n\t" | |
729 | "mov %%cs, %0\n\t" | |
730 | "pushq %q0\n\t" | |
731 | "pushq $1f\n\t" | |
732 | "iretq\n\t" | |
76846bf3 | 733 | UNWIND_HINT_RESTORE |
c198b121 | 734 | "1:" |
f5caf621 | 735 | : "=&r" (tmp), ASM_CALL_CONSTRAINT : : "cc", "memory"); |
5367b688 | 736 | #endif |
683e0253 GOC |
737 | } |
738 | ||
683e0253 | 739 | extern void select_idle_routine(const struct cpuinfo_x86 *c); |
07c94a38 | 740 | extern void amd_e400_c1e_apic_setup(void); |
683e0253 | 741 | |
4d46a89e | 742 | extern unsigned long boot_option_idle_override; |
683e0253 | 743 | |
d1896049 | 744 | enum idle_boot_override {IDLE_NO_OVERRIDE=0, IDLE_HALT, IDLE_NOMWAIT, |
69fb3676 | 745 | IDLE_POLL}; |
d1896049 | 746 | |
1a53905a GOC |
747 | extern void enable_sep_cpu(void); |
748 | extern int sysenter_setup(void); | |
749 | ||
8170e6be | 750 | void early_trap_pf_init(void); |
29c84391 | 751 | |
1a53905a | 752 | /* Defined in head.S */ |
4d46a89e | 753 | extern struct desc_ptr early_gdt_descr; |
1a53905a | 754 | |
552be871 | 755 | extern void switch_to_new_gdt(int); |
45fc8757 | 756 | extern void load_direct_gdt(int); |
69218e47 | 757 | extern void load_fixmap_gdt(int); |
11e3a840 | 758 | extern void load_percpu_segment(int); |
1a53905a | 759 | extern void cpu_init(void); |
1a53905a | 760 | |
c2724775 MM |
761 | static inline unsigned long get_debugctlmsr(void) |
762 | { | |
ea8e61b7 | 763 | unsigned long debugctlmsr = 0; |
c2724775 MM |
764 | |
765 | #ifndef CONFIG_X86_DEBUGCTLMSR | |
766 | if (boot_cpu_data.x86 < 6) | |
767 | return 0; | |
768 | #endif | |
769 | rdmsrl(MSR_IA32_DEBUGCTLMSR, debugctlmsr); | |
770 | ||
ea8e61b7 | 771 | return debugctlmsr; |
c2724775 MM |
772 | } |
773 | ||
5b0e5084 JB |
774 | static inline void update_debugctlmsr(unsigned long debugctlmsr) |
775 | { | |
776 | #ifndef CONFIG_X86_DEBUGCTLMSR | |
777 | if (boot_cpu_data.x86 < 6) | |
778 | return; | |
779 | #endif | |
780 | wrmsrl(MSR_IA32_DEBUGCTLMSR, debugctlmsr); | |
781 | } | |
782 | ||
9bd1190a ON |
783 | extern void set_task_blockstep(struct task_struct *task, bool on); |
784 | ||
4d46a89e IM |
785 | /* Boot loader type from the setup header: */ |
786 | extern int bootloader_type; | |
5031296c | 787 | extern int bootloader_version; |
1a53905a | 788 | |
4d46a89e | 789 | extern char ignore_fpu_irq; |
683e0253 GOC |
790 | |
791 | #define HAVE_ARCH_PICK_MMAP_LAYOUT 1 | |
792 | #define ARCH_HAS_PREFETCHW | |
793 | #define ARCH_HAS_SPINLOCK_PREFETCH | |
794 | ||
ae2e15eb | 795 | #ifdef CONFIG_X86_32 |
a930dc45 | 796 | # define BASE_PREFETCH "" |
4d46a89e | 797 | # define ARCH_HAS_PREFETCH |
ae2e15eb | 798 | #else |
a930dc45 | 799 | # define BASE_PREFETCH "prefetcht0 %P1" |
ae2e15eb GOC |
800 | #endif |
801 | ||
4d46a89e IM |
802 | /* |
803 | * Prefetch instructions for Pentium III (+) and AMD Athlon (+) | |
804 | * | |
805 | * It's not worth to care about 3dnow prefetches for the K6 | |
806 | * because they are microcoded there and very slow. | |
807 | */ | |
ae2e15eb GOC |
808 | static inline void prefetch(const void *x) |
809 | { | |
a930dc45 | 810 | alternative_input(BASE_PREFETCH, "prefetchnta %P1", |
ae2e15eb | 811 | X86_FEATURE_XMM, |
a930dc45 | 812 | "m" (*(const char *)x)); |
ae2e15eb GOC |
813 | } |
814 | ||
4d46a89e IM |
815 | /* |
816 | * 3dnow prefetch to get an exclusive cache line. | |
817 | * Useful for spinlocks to avoid one state transition in the | |
818 | * cache coherency protocol: | |
819 | */ | |
ae2e15eb GOC |
820 | static inline void prefetchw(const void *x) |
821 | { | |
a930dc45 BP |
822 | alternative_input(BASE_PREFETCH, "prefetchw %P1", |
823 | X86_FEATURE_3DNOWPREFETCH, | |
824 | "m" (*(const char *)x)); | |
ae2e15eb GOC |
825 | } |
826 | ||
4d46a89e IM |
827 | static inline void spin_lock_prefetch(const void *x) |
828 | { | |
829 | prefetchw(x); | |
830 | } | |
831 | ||
d9e05cc5 AL |
832 | #define TOP_OF_INIT_STACK ((unsigned long)&init_stack + sizeof(init_stack) - \ |
833 | TOP_OF_KERNEL_STACK_PADDING) | |
834 | ||
3500130b AL |
835 | #define task_top_of_stack(task) ((unsigned long)(task_pt_regs(task) + 1)) |
836 | ||
d375cf15 AL |
837 | #define task_pt_regs(task) \ |
838 | ({ \ | |
839 | unsigned long __ptr = (unsigned long)task_stack_page(task); \ | |
840 | __ptr += THREAD_SIZE - TOP_OF_KERNEL_STACK_PADDING; \ | |
841 | ((struct pt_regs *)__ptr) - 1; \ | |
842 | }) | |
843 | ||
2f66dcc9 GOC |
844 | #ifdef CONFIG_X86_32 |
845 | /* | |
846 | * User space process size: 3GB (default). | |
847 | */ | |
8f3e474f | 848 | #define IA32_PAGE_OFFSET PAGE_OFFSET |
4d46a89e | 849 | #define TASK_SIZE PAGE_OFFSET |
b569bab7 | 850 | #define TASK_SIZE_LOW TASK_SIZE |
d9517346 | 851 | #define TASK_SIZE_MAX TASK_SIZE |
44b04912 | 852 | #define DEFAULT_MAP_WINDOW TASK_SIZE |
4d46a89e IM |
853 | #define STACK_TOP TASK_SIZE |
854 | #define STACK_TOP_MAX STACK_TOP | |
855 | ||
856 | #define INIT_THREAD { \ | |
d9e05cc5 | 857 | .sp0 = TOP_OF_INIT_STACK, \ |
4d46a89e IM |
858 | .sysenter_cs = __KERNEL_CS, \ |
859 | .io_bitmap_ptr = NULL, \ | |
13d4ea09 | 860 | .addr_limit = KERNEL_DS, \ |
2f66dcc9 GOC |
861 | } |
862 | ||
4d46a89e | 863 | #define KSTK_ESP(task) (task_pt_regs(task)->sp) |
2f66dcc9 GOC |
864 | |
865 | #else | |
866 | /* | |
f55f0501 AL |
867 | * User space process size. This is the first address outside the user range. |
868 | * There are a few constraints that determine this: | |
869 | * | |
870 | * On Intel CPUs, if a SYSCALL instruction is at the highest canonical | |
871 | * address, then that syscall will enter the kernel with a | |
872 | * non-canonical return address, and SYSRET will explode dangerously. | |
873 | * We avoid this particular problem by preventing anything executable | |
874 | * from being mapped at the maximum canonical address. | |
875 | * | |
876 | * On AMD CPUs in the Ryzen family, there's a nasty bug in which the | |
877 | * CPUs malfunction if they execute code from the highest canonical page. | |
878 | * They'll speculate right off the end of the canonical space, and | |
879 | * bad things happen. This is worked around in the same way as the | |
880 | * Intel problem. | |
881 | * | |
882 | * With page table isolation enabled, we map the LDT in ... [stay tuned] | |
2f66dcc9 | 883 | */ |
ee00f4a3 | 884 | #define TASK_SIZE_MAX ((1UL << __VIRTUAL_MASK_SHIFT) - PAGE_SIZE) |
2f66dcc9 | 885 | |
ee00f4a3 | 886 | #define DEFAULT_MAP_WINDOW ((1UL << 47) - PAGE_SIZE) |
2f66dcc9 GOC |
887 | |
888 | /* This decides where the kernel will search for a free chunk of vm | |
889 | * space during mmap's. | |
890 | */ | |
4d46a89e IM |
891 | #define IA32_PAGE_OFFSET ((current->personality & ADDR_LIMIT_3GB) ? \ |
892 | 0xc0000000 : 0xFFFFe000) | |
2f66dcc9 | 893 | |
b569bab7 KS |
894 | #define TASK_SIZE_LOW (test_thread_flag(TIF_ADDR32) ? \ |
895 | IA32_PAGE_OFFSET : DEFAULT_MAP_WINDOW) | |
6bd33008 | 896 | #define TASK_SIZE (test_thread_flag(TIF_ADDR32) ? \ |
d9517346 | 897 | IA32_PAGE_OFFSET : TASK_SIZE_MAX) |
6bd33008 | 898 | #define TASK_SIZE_OF(child) ((test_tsk_thread_flag(child, TIF_ADDR32)) ? \ |
d9517346 | 899 | IA32_PAGE_OFFSET : TASK_SIZE_MAX) |
2f66dcc9 | 900 | |
b569bab7 | 901 | #define STACK_TOP TASK_SIZE_LOW |
d9517346 | 902 | #define STACK_TOP_MAX TASK_SIZE_MAX |
922a70d3 | 903 | |
13d4ea09 | 904 | #define INIT_THREAD { \ |
13d4ea09 | 905 | .addr_limit = KERNEL_DS, \ |
2f66dcc9 GOC |
906 | } |
907 | ||
89240ba0 | 908 | extern unsigned long KSTK_ESP(struct task_struct *task); |
d046ff8b | 909 | |
2f66dcc9 GOC |
910 | #endif /* CONFIG_X86_64 */ |
911 | ||
513ad84b IM |
912 | extern void start_thread(struct pt_regs *regs, unsigned long new_ip, |
913 | unsigned long new_sp); | |
914 | ||
4d46a89e IM |
915 | /* |
916 | * This decides where the kernel will search for a free chunk of vm | |
683e0253 GOC |
917 | * space during mmap's. |
918 | */ | |
8f3e474f | 919 | #define __TASK_UNMAPPED_BASE(task_size) (PAGE_ALIGN(task_size / 3)) |
b569bab7 | 920 | #define TASK_UNMAPPED_BASE __TASK_UNMAPPED_BASE(TASK_SIZE_LOW) |
683e0253 | 921 | |
4d46a89e | 922 | #define KSTK_EIP(task) (task_pt_regs(task)->ip) |
683e0253 | 923 | |
529e25f6 EB |
924 | /* Get/set a process' ability to use the timestamp counter instruction */ |
925 | #define GET_TSC_CTL(adr) get_tsc_mode((adr)) | |
926 | #define SET_TSC_CTL(val) set_tsc_mode((val)) | |
927 | ||
928 | extern int get_tsc_mode(unsigned long adr); | |
929 | extern int set_tsc_mode(unsigned int val); | |
930 | ||
e9ea1e7f KH |
931 | DECLARE_PER_CPU(u64, msr_misc_features_shadow); |
932 | ||
fe3d197f | 933 | /* Register/unregister a process' MPX related resource */ |
46a6e0cf DH |
934 | #define MPX_ENABLE_MANAGEMENT() mpx_enable_management() |
935 | #define MPX_DISABLE_MANAGEMENT() mpx_disable_management() | |
fe3d197f DH |
936 | |
937 | #ifdef CONFIG_X86_INTEL_MPX | |
46a6e0cf DH |
938 | extern int mpx_enable_management(void); |
939 | extern int mpx_disable_management(void); | |
fe3d197f | 940 | #else |
46a6e0cf | 941 | static inline int mpx_enable_management(void) |
fe3d197f DH |
942 | { |
943 | return -EINVAL; | |
944 | } | |
46a6e0cf | 945 | static inline int mpx_disable_management(void) |
fe3d197f DH |
946 | { |
947 | return -EINVAL; | |
948 | } | |
949 | #endif /* CONFIG_X86_INTEL_MPX */ | |
950 | ||
bc8e80d5 | 951 | #ifdef CONFIG_CPU_SUP_AMD |
8b84c8df | 952 | extern u16 amd_get_nb_id(int cpu); |
cc2749e4 | 953 | extern u32 amd_get_nodes_per_socket(void); |
bc8e80d5 BP |
954 | #else |
955 | static inline u16 amd_get_nb_id(int cpu) { return 0; } | |
956 | static inline u32 amd_get_nodes_per_socket(void) { return 0; } | |
957 | #endif | |
6a812691 | 958 | |
96e39ac0 JW |
959 | static inline uint32_t hypervisor_cpuid_base(const char *sig, uint32_t leaves) |
960 | { | |
961 | uint32_t base, eax, signature[3]; | |
962 | ||
963 | for (base = 0x40000000; base < 0x40010000; base += 0x100) { | |
964 | cpuid(base, &eax, &signature[0], &signature[1], &signature[2]); | |
965 | ||
966 | if (!memcmp(sig, signature, 12) && | |
967 | (leaves == 0 || ((eax - base) >= leaves))) | |
968 | return base; | |
969 | } | |
970 | ||
971 | return 0; | |
972 | } | |
973 | ||
f05e798a DH |
974 | extern unsigned long arch_align_stack(unsigned long sp); |
975 | extern void free_init_pages(char *what, unsigned long begin, unsigned long end); | |
6ea2738e | 976 | extern void free_kernel_image_pages(void *begin, void *end); |
f05e798a DH |
977 | |
978 | void default_idle(void); | |
6a377ddc LB |
979 | #ifdef CONFIG_XEN |
980 | bool xen_set_default_idle(void); | |
981 | #else | |
982 | #define xen_set_default_idle 0 | |
983 | #endif | |
f05e798a DH |
984 | |
985 | void stop_this_cpu(void *dummy); | |
4d067d8e | 986 | void df_debug(struct pt_regs *regs, long error_code); |
1008c52c | 987 | void microcode_check(void); |
d90a7a0e JK |
988 | |
989 | enum l1tf_mitigations { | |
990 | L1TF_MITIGATION_OFF, | |
991 | L1TF_MITIGATION_FLUSH_NOWARN, | |
992 | L1TF_MITIGATION_FLUSH, | |
993 | L1TF_MITIGATION_FLUSH_NOSMT, | |
994 | L1TF_MITIGATION_FULL, | |
995 | L1TF_MITIGATION_FULL_FORCE | |
996 | }; | |
997 | ||
998 | extern enum l1tf_mitigations l1tf_mitigation; | |
999 | ||
1965aae3 | 1000 | #endif /* _ASM_X86_PROCESSOR_H */ |