Line data Source code
1 : /* SPDX-License-Identifier: GPL-2.0 */
2 : #ifndef _ASM_X86_PROCESSOR_H
3 : #define _ASM_X86_PROCESSOR_H
4 :
5 : #include <asm/processor-flags.h>
6 :
7 : /* Forward declaration, a strange C thing */
8 : struct task_struct;
9 : struct mm_struct;
10 : struct io_bitmap;
11 : struct vm86;
12 :
13 : #include <asm/math_emu.h>
14 : #include <asm/segment.h>
15 : #include <asm/types.h>
16 : #include <uapi/asm/sigcontext.h>
17 : #include <asm/current.h>
18 : #include <asm/cpufeatures.h>
19 : #include <asm/cpuid.h>
20 : #include <asm/page.h>
21 : #include <asm/pgtable_types.h>
22 : #include <asm/percpu.h>
23 : #include <asm/msr.h>
24 : #include <asm/desc_defs.h>
25 : #include <asm/nops.h>
26 : #include <asm/special_insns.h>
27 : #include <asm/fpu/types.h>
28 : #include <asm/unwind_hints.h>
29 : #include <asm/vmxfeatures.h>
30 : #include <asm/vdso/processor.h>
31 :
32 : #include <linux/personality.h>
33 : #include <linux/cache.h>
34 : #include <linux/threads.h>
35 : #include <linux/math64.h>
36 : #include <linux/err.h>
37 : #include <linux/irqflags.h>
38 : #include <linux/mem_encrypt.h>
39 :
40 : /*
41 : * We handle most unaligned accesses in hardware. On the other hand
42 : * unaligned DMA can be quite expensive on some Nehalem processors.
43 : *
44 : * Based on this we disable the IP header alignment in network drivers.
45 : */
46 : #define NET_IP_ALIGN 0
47 :
48 : #define HBP_NUM 4
49 :
50 : /*
51 : * These alignment constraints are for performance in the vSMP case,
52 : * but in the task_struct case we must also meet hardware imposed
53 : * alignment requirements of the FPU state:
54 : */
55 : #ifdef CONFIG_X86_VSMP
56 : # define ARCH_MIN_TASKALIGN (1 << INTERNODE_CACHE_SHIFT)
57 : # define ARCH_MIN_MMSTRUCT_ALIGN (1 << INTERNODE_CACHE_SHIFT)
58 : #else
59 : # define ARCH_MIN_TASKALIGN __alignof__(union fpregs_state)
60 : # define ARCH_MIN_MMSTRUCT_ALIGN 0
61 : #endif
62 :
63 : enum tlb_infos {
64 : ENTRIES,
65 : NR_INFO
66 : };
67 :
68 : extern u16 __read_mostly tlb_lli_4k[NR_INFO];
69 : extern u16 __read_mostly tlb_lli_2m[NR_INFO];
70 : extern u16 __read_mostly tlb_lli_4m[NR_INFO];
71 : extern u16 __read_mostly tlb_lld_4k[NR_INFO];
72 : extern u16 __read_mostly tlb_lld_2m[NR_INFO];
73 : extern u16 __read_mostly tlb_lld_4m[NR_INFO];
74 : extern u16 __read_mostly tlb_lld_1g[NR_INFO];
75 :
76 : /*
77 : * CPU type and hardware bug flags. Kept separately for each CPU.
78 : * Members of this structure are referenced in head_32.S, so think twice
79 : * before touching them. [mj]
80 : */
81 :
82 : struct cpuinfo_x86 {
83 : __u8 x86; /* CPU family */
84 : __u8 x86_vendor; /* CPU vendor */
85 : __u8 x86_model;
86 : __u8 x86_stepping;
87 : #ifdef CONFIG_X86_64
88 : /* Number of 4K pages in DTLB/ITLB combined(in pages): */
89 : int x86_tlbsize;
90 : #endif
91 : #ifdef CONFIG_X86_VMX_FEATURE_NAMES
92 : __u32 vmx_capability[NVMXINTS];
93 : #endif
94 : __u8 x86_virt_bits;
95 : __u8 x86_phys_bits;
96 : /* CPUID returned core id bits: */
97 : __u8 x86_coreid_bits;
98 : __u8 cu_id;
99 : /* Max extended CPUID function supported: */
100 : __u32 extended_cpuid_level;
101 : /* Maximum supported CPUID level, -1=no CPUID: */
102 : int cpuid_level;
103 : /*
104 : * Align to size of unsigned long because the x86_capability array
105 : * is passed to bitops which require the alignment. Use unnamed
106 : * union to enforce the array is aligned to size of unsigned long.
107 : */
108 : union {
109 : __u32 x86_capability[NCAPINTS + NBUGINTS];
110 : unsigned long x86_capability_alignment;
111 : };
112 : char x86_vendor_id[16];
113 : char x86_model_id[64];
114 : /* in KB - valid for CPUS which support this call: */
115 : unsigned int x86_cache_size;
116 : int x86_cache_alignment; /* In bytes */
117 : /* Cache QoS architectural values, valid only on the BSP: */
118 : int x86_cache_max_rmid; /* max index */
119 : int x86_cache_occ_scale; /* scale to bytes */
120 : int x86_cache_mbm_width_offset;
121 : int x86_power;
122 : unsigned long loops_per_jiffy;
123 : /* protected processor identification number */
124 : u64 ppin;
125 : /* cpuid returned max cores value: */
126 : u16 x86_max_cores;
127 : u16 apicid;
128 : u16 initial_apicid;
129 : u16 x86_clflush_size;
130 : /* number of cores as seen by the OS: */
131 : u16 booted_cores;
132 : /* Physical processor id: */
133 : u16 phys_proc_id;
134 : /* Logical processor id: */
135 : u16 logical_proc_id;
136 : /* Core id: */
137 : u16 cpu_core_id;
138 : u16 cpu_die_id;
139 : u16 logical_die_id;
140 : /* Index into per_cpu list: */
141 : u16 cpu_index;
142 : /* Is SMT active on this core? */
143 : bool smt_active;
144 : u32 microcode;
145 : /* Address space bits used by the cache internally */
146 : u8 x86_cache_bits;
147 : unsigned initialized : 1;
148 : } __randomize_layout;
149 :
150 : #define X86_VENDOR_INTEL 0
151 : #define X86_VENDOR_CYRIX 1
152 : #define X86_VENDOR_AMD 2
153 : #define X86_VENDOR_UMC 3
154 : #define X86_VENDOR_CENTAUR 5
155 : #define X86_VENDOR_TRANSMETA 7
156 : #define X86_VENDOR_NSC 8
157 : #define X86_VENDOR_HYGON 9
158 : #define X86_VENDOR_ZHAOXIN 10
159 : #define X86_VENDOR_VORTEX 11
160 : #define X86_VENDOR_NUM 12
161 :
162 : #define X86_VENDOR_UNKNOWN 0xff
163 :
164 : /*
165 : * capabilities of CPUs
166 : */
167 : extern struct cpuinfo_x86 boot_cpu_data;
168 : extern struct cpuinfo_x86 new_cpu_data;
169 :
170 : extern __u32 cpu_caps_cleared[NCAPINTS + NBUGINTS];
171 : extern __u32 cpu_caps_set[NCAPINTS + NBUGINTS];
172 :
173 : #ifdef CONFIG_SMP
174 : DECLARE_PER_CPU_READ_MOSTLY(struct cpuinfo_x86, cpu_info);
175 : #define cpu_data(cpu) per_cpu(cpu_info, cpu)
176 : #else
177 : #define cpu_info boot_cpu_data
178 : #define cpu_data(cpu) boot_cpu_data
179 : #endif
180 :
181 : extern const struct seq_operations cpuinfo_op;
182 :
183 : #define cache_line_size() (boot_cpu_data.x86_cache_alignment)
184 :
185 : extern void cpu_detect(struct cpuinfo_x86 *c);
186 :
187 : static inline unsigned long long l1tf_pfn_limit(void)
188 : {
189 : return BIT_ULL(boot_cpu_data.x86_cache_bits - 1 - PAGE_SHIFT);
190 : }
191 :
192 : extern void early_cpu_init(void);
193 : extern void identify_boot_cpu(void);
194 : extern void identify_secondary_cpu(struct cpuinfo_x86 *);
195 : extern void print_cpu_info(struct cpuinfo_x86 *);
196 : void print_cpu_msr(struct cpuinfo_x86 *);
197 :
198 : /*
199 : * Friendlier CR3 helpers.
200 : */
201 : static inline unsigned long read_cr3_pa(void)
202 : {
203 : return __read_cr3() & CR3_ADDR_MASK;
204 : }
205 :
206 : static inline unsigned long native_read_cr3_pa(void)
207 : {
208 : return __native_read_cr3() & CR3_ADDR_MASK;
209 : }
210 :
211 : static inline void load_cr3(pgd_t *pgdir)
212 : {
213 : write_cr3(__sme_pa(pgdir));
214 : }
215 :
216 : /*
217 : * Note that while the legacy 'TSS' name comes from 'Task State Segment',
218 : * on modern x86 CPUs the TSS also holds information important to 64-bit mode,
219 : * unrelated to the task-switch mechanism:
220 : */
221 : #ifdef CONFIG_X86_32
222 : /* This is the TSS defined by the hardware. */
223 : struct x86_hw_tss {
224 : unsigned short back_link, __blh;
225 : unsigned long sp0;
226 : unsigned short ss0, __ss0h;
227 : unsigned long sp1;
228 :
229 : /*
230 : * We don't use ring 1, so ss1 is a convenient scratch space in
231 : * the same cacheline as sp0. We use ss1 to cache the value in
232 : * MSR_IA32_SYSENTER_CS. When we context switch
233 : * MSR_IA32_SYSENTER_CS, we first check if the new value being
234 : * written matches ss1, and, if it's not, then we wrmsr the new
235 : * value and update ss1.
236 : *
237 : * The only reason we context switch MSR_IA32_SYSENTER_CS is
238 : * that we set it to zero in vm86 tasks to avoid corrupting the
239 : * stack if we were to go through the sysenter path from vm86
240 : * mode.
241 : */
242 : unsigned short ss1; /* MSR_IA32_SYSENTER_CS */
243 :
244 : unsigned short __ss1h;
245 : unsigned long sp2;
246 : unsigned short ss2, __ss2h;
247 : unsigned long __cr3;
248 : unsigned long ip;
249 : unsigned long flags;
250 : unsigned long ax;
251 : unsigned long cx;
252 : unsigned long dx;
253 : unsigned long bx;
254 : unsigned long sp;
255 : unsigned long bp;
256 : unsigned long si;
257 : unsigned long di;
258 : unsigned short es, __esh;
259 : unsigned short cs, __csh;
260 : unsigned short ss, __ssh;
261 : unsigned short ds, __dsh;
262 : unsigned short fs, __fsh;
263 : unsigned short gs, __gsh;
264 : unsigned short ldt, __ldth;
265 : unsigned short trace;
266 : unsigned short io_bitmap_base;
267 :
268 : } __attribute__((packed));
269 : #else
270 : struct x86_hw_tss {
271 : u32 reserved1;
272 : u64 sp0;
273 : u64 sp1;
274 :
275 : /*
276 : * Since Linux does not use ring 2, the 'sp2' slot is unused by
277 : * hardware. entry_SYSCALL_64 uses it as scratch space to stash
278 : * the user RSP value.
279 : */
280 : u64 sp2;
281 :
282 : u64 reserved2;
283 : u64 ist[7];
284 : u32 reserved3;
285 : u32 reserved4;
286 : u16 reserved5;
287 : u16 io_bitmap_base;
288 :
289 : } __attribute__((packed));
290 : #endif
291 :
292 : /*
293 : * IO-bitmap sizes:
294 : */
295 : #define IO_BITMAP_BITS 65536
296 : #define IO_BITMAP_BYTES (IO_BITMAP_BITS / BITS_PER_BYTE)
297 : #define IO_BITMAP_LONGS (IO_BITMAP_BYTES / sizeof(long))
298 :
299 : #define IO_BITMAP_OFFSET_VALID_MAP \
300 : (offsetof(struct tss_struct, io_bitmap.bitmap) - \
301 : offsetof(struct tss_struct, x86_tss))
302 :
303 : #define IO_BITMAP_OFFSET_VALID_ALL \
304 : (offsetof(struct tss_struct, io_bitmap.mapall) - \
305 : offsetof(struct tss_struct, x86_tss))
306 :
307 : #ifdef CONFIG_X86_IOPL_IOPERM
308 : /*
309 : * sizeof(unsigned long) coming from an extra "long" at the end of the
310 : * iobitmap. The limit is inclusive, i.e. the last valid byte.
311 : */
312 : # define __KERNEL_TSS_LIMIT \
313 : (IO_BITMAP_OFFSET_VALID_ALL + IO_BITMAP_BYTES + \
314 : sizeof(unsigned long) - 1)
315 : #else
316 : # define __KERNEL_TSS_LIMIT \
317 : (offsetof(struct tss_struct, x86_tss) + sizeof(struct x86_hw_tss) - 1)
318 : #endif
319 :
320 : /* Base offset outside of TSS_LIMIT so unpriviledged IO causes #GP */
321 : #define IO_BITMAP_OFFSET_INVALID (__KERNEL_TSS_LIMIT + 1)
322 :
323 : struct entry_stack {
324 : char stack[PAGE_SIZE];
325 : };
326 :
327 : struct entry_stack_page {
328 : struct entry_stack stack;
329 : } __aligned(PAGE_SIZE);
330 :
331 : /*
332 : * All IO bitmap related data stored in the TSS:
333 : */
334 : struct x86_io_bitmap {
335 : /* The sequence number of the last active bitmap. */
336 : u64 prev_sequence;
337 :
338 : /*
339 : * Store the dirty size of the last io bitmap offender. The next
340 : * one will have to do the cleanup as the switch out to a non io
341 : * bitmap user will just set x86_tss.io_bitmap_base to a value
342 : * outside of the TSS limit. So for sane tasks there is no need to
343 : * actually touch the io_bitmap at all.
344 : */
345 : unsigned int prev_max;
346 :
347 : /*
348 : * The extra 1 is there because the CPU will access an
349 : * additional byte beyond the end of the IO permission
350 : * bitmap. The extra byte must be all 1 bits, and must
351 : * be within the limit.
352 : */
353 : unsigned long bitmap[IO_BITMAP_LONGS + 1];
354 :
355 : /*
356 : * Special I/O bitmap to emulate IOPL(3). All bytes zero,
357 : * except the additional byte at the end.
358 : */
359 : unsigned long mapall[IO_BITMAP_LONGS + 1];
360 : };
361 :
362 : struct tss_struct {
363 : /*
364 : * The fixed hardware portion. This must not cross a page boundary
365 : * at risk of violating the SDM's advice and potentially triggering
366 : * errata.
367 : */
368 : struct x86_hw_tss x86_tss;
369 :
370 : struct x86_io_bitmap io_bitmap;
371 : } __aligned(PAGE_SIZE);
372 :
373 : DECLARE_PER_CPU_PAGE_ALIGNED(struct tss_struct, cpu_tss_rw);
374 :
375 : /* Per CPU interrupt stacks */
376 : struct irq_stack {
377 : char stack[IRQ_STACK_SIZE];
378 : } __aligned(IRQ_STACK_SIZE);
379 :
380 : #ifdef CONFIG_X86_64
381 : struct fixed_percpu_data {
382 : /*
383 : * GCC hardcodes the stack canary as %gs:40. Since the
384 : * irq_stack is the object at %gs:0, we reserve the bottom
385 : * 48 bytes of the irq stack for the canary.
386 : *
387 : * Once we are willing to require -mstack-protector-guard-symbol=
388 : * support for x86_64 stackprotector, we can get rid of this.
389 : */
390 : char gs_base[40];
391 : unsigned long stack_canary;
392 : };
393 :
394 : DECLARE_PER_CPU_FIRST(struct fixed_percpu_data, fixed_percpu_data) __visible;
395 : DECLARE_INIT_PER_CPU(fixed_percpu_data);
396 :
397 : static inline unsigned long cpu_kernelmode_gs_base(int cpu)
398 : {
399 : return (unsigned long)per_cpu(fixed_percpu_data.gs_base, cpu);
400 : }
401 :
402 : extern asmlinkage void ignore_sysret(void);
403 :
404 : /* Save actual FS/GS selectors and bases to current->thread */
405 : void current_save_fsgs(void);
406 : #else /* X86_64 */
407 : #ifdef CONFIG_STACKPROTECTOR
408 : DECLARE_PER_CPU(unsigned long, __stack_chk_guard);
409 : #endif
410 : #endif /* !X86_64 */
411 :
412 : struct perf_event;
413 :
414 : struct thread_struct {
415 : /* Cached TLS descriptors: */
416 : struct desc_struct tls_array[GDT_ENTRY_TLS_ENTRIES];
417 : #ifdef CONFIG_X86_32
418 : unsigned long sp0;
419 : #endif
420 : unsigned long sp;
421 : #ifdef CONFIG_X86_32
422 : unsigned long sysenter_cs;
423 : #else
424 : unsigned short es;
425 : unsigned short ds;
426 : unsigned short fsindex;
427 : unsigned short gsindex;
428 : #endif
429 :
430 : #ifdef CONFIG_X86_64
431 : unsigned long fsbase;
432 : unsigned long gsbase;
433 : #else
434 : /*
435 : * XXX: this could presumably be unsigned short. Alternatively,
436 : * 32-bit kernels could be taught to use fsindex instead.
437 : */
438 : unsigned long fs;
439 : unsigned long gs;
440 : #endif
441 :
442 : /* Save middle states of ptrace breakpoints */
443 : struct perf_event *ptrace_bps[HBP_NUM];
444 : /* Debug status used for traps, single steps, etc... */
445 : unsigned long virtual_dr6;
446 : /* Keep track of the exact dr7 value set by the user */
447 : unsigned long ptrace_dr7;
448 : /* Fault info: */
449 : unsigned long cr2;
450 : unsigned long trap_nr;
451 : unsigned long error_code;
452 : #ifdef CONFIG_VM86
453 : /* Virtual 86 mode info */
454 : struct vm86 *vm86;
455 : #endif
456 : /* IO permissions: */
457 : struct io_bitmap *io_bitmap;
458 :
459 : /*
460 : * IOPL. Privilege level dependent I/O permission which is
461 : * emulated via the I/O bitmap to prevent user space from disabling
462 : * interrupts.
463 : */
464 : unsigned long iopl_emul;
465 :
466 : unsigned int iopl_warn:1;
467 : unsigned int sig_on_uaccess_err:1;
468 :
469 : /*
470 : * Protection Keys Register for Userspace. Loaded immediately on
471 : * context switch. Store it in thread_struct to avoid a lookup in
472 : * the tasks's FPU xstate buffer. This value is only valid when a
473 : * task is scheduled out. For 'current' the authoritative source of
474 : * PKRU is the hardware itself.
475 : */
476 : u32 pkru;
477 :
478 : /* Floating point and extended processor state */
479 : struct fpu fpu;
480 : /*
481 : * WARNING: 'fpu' is dynamically-sized. It *MUST* be at
482 : * the end.
483 : */
484 : };
485 :
486 : extern void fpu_thread_struct_whitelist(unsigned long *offset, unsigned long *size);
487 :
488 : static inline void arch_thread_struct_whitelist(unsigned long *offset,
489 : unsigned long *size)
490 : {
491 : fpu_thread_struct_whitelist(offset, size);
492 : }
493 :
494 : static inline void
495 : native_load_sp0(unsigned long sp0)
496 : {
497 : this_cpu_write(cpu_tss_rw.x86_tss.sp0, sp0);
498 : }
499 :
500 : static __always_inline void native_swapgs(void)
501 : {
502 : #ifdef CONFIG_X86_64
503 : asm volatile("swapgs" ::: "memory");
504 : #endif
505 : }
506 :
507 : static __always_inline unsigned long current_top_of_stack(void)
508 : {
509 : /*
510 : * We can't read directly from tss.sp0: sp0 on x86_32 is special in
511 : * and around vm86 mode and sp0 on x86_64 is special because of the
512 : * entry trampoline.
513 : */
514 : return this_cpu_read_stable(pcpu_hot.top_of_stack);
515 : }
516 :
517 : static __always_inline bool on_thread_stack(void)
518 : {
519 : return (unsigned long)(current_top_of_stack() -
520 : current_stack_pointer) < THREAD_SIZE;
521 : }
522 :
523 : #ifdef CONFIG_PARAVIRT_XXL
524 : #include <asm/paravirt.h>
525 : #else
526 :
527 : static inline void load_sp0(unsigned long sp0)
528 : {
529 : native_load_sp0(sp0);
530 : }
531 :
532 : #endif /* CONFIG_PARAVIRT_XXL */
533 :
534 : unsigned long __get_wchan(struct task_struct *p);
535 :
536 : extern void select_idle_routine(const struct cpuinfo_x86 *c);
537 : extern void amd_e400_c1e_apic_setup(void);
538 :
539 : extern unsigned long boot_option_idle_override;
540 :
541 : enum idle_boot_override {IDLE_NO_OVERRIDE=0, IDLE_HALT, IDLE_NOMWAIT,
542 : IDLE_POLL};
543 :
544 : extern void enable_sep_cpu(void);
545 :
546 :
547 : /* Defined in head.S */
548 : extern struct desc_ptr early_gdt_descr;
549 :
550 : extern void switch_gdt_and_percpu_base(int);
551 : extern void load_direct_gdt(int);
552 : extern void load_fixmap_gdt(int);
553 : extern void cpu_init(void);
554 : extern void cpu_init_exception_handling(void);
555 : extern void cr4_init(void);
556 :
557 : static inline unsigned long get_debugctlmsr(void)
558 : {
559 : unsigned long debugctlmsr = 0;
560 :
561 : #ifndef CONFIG_X86_DEBUGCTLMSR
562 : if (boot_cpu_data.x86 < 6)
563 : return 0;
564 : #endif
565 : rdmsrl(MSR_IA32_DEBUGCTLMSR, debugctlmsr);
566 :
567 : return debugctlmsr;
568 : }
569 :
570 : static inline void update_debugctlmsr(unsigned long debugctlmsr)
571 : {
572 : #ifndef CONFIG_X86_DEBUGCTLMSR
573 : if (boot_cpu_data.x86 < 6)
574 : return;
575 : #endif
576 : wrmsrl(MSR_IA32_DEBUGCTLMSR, debugctlmsr);
577 : }
578 :
579 : extern void set_task_blockstep(struct task_struct *task, bool on);
580 :
581 : /* Boot loader type from the setup header: */
582 : extern int bootloader_type;
583 : extern int bootloader_version;
584 :
585 : extern char ignore_fpu_irq;
586 :
587 : #define HAVE_ARCH_PICK_MMAP_LAYOUT 1
588 : #define ARCH_HAS_PREFETCHW
589 : #define ARCH_HAS_SPINLOCK_PREFETCH
590 :
591 : #ifdef CONFIG_X86_32
592 : # define BASE_PREFETCH ""
593 : # define ARCH_HAS_PREFETCH
594 : #else
595 : # define BASE_PREFETCH "prefetcht0 %P1"
596 : #endif
597 :
598 : /*
599 : * Prefetch instructions for Pentium III (+) and AMD Athlon (+)
600 : *
601 : * It's not worth to care about 3dnow prefetches for the K6
602 : * because they are microcoded there and very slow.
603 : */
604 : static inline void prefetch(const void *x)
605 : {
606 : alternative_input(BASE_PREFETCH, "prefetchnta %P1",
607 : X86_FEATURE_XMM,
608 : "m" (*(const char *)x));
609 : }
610 :
611 : /*
612 : * 3dnow prefetch to get an exclusive cache line.
613 : * Useful for spinlocks to avoid one state transition in the
614 : * cache coherency protocol:
615 : */
616 : static __always_inline void prefetchw(const void *x)
617 : {
618 184981001 : alternative_input(BASE_PREFETCH, "prefetchw %P1",
619 : X86_FEATURE_3DNOWPREFETCH,
620 : "m" (*(const char *)x));
621 : }
622 :
623 : static inline void spin_lock_prefetch(const void *x)
624 : {
625 30914379 : prefetchw(x);
626 : }
627 :
628 : #define TOP_OF_INIT_STACK ((unsigned long)&init_stack + sizeof(init_stack) - \
629 : TOP_OF_KERNEL_STACK_PADDING)
630 :
631 : #define task_top_of_stack(task) ((unsigned long)(task_pt_regs(task) + 1))
632 :
633 : #define task_pt_regs(task) \
634 : ({ \
635 : unsigned long __ptr = (unsigned long)task_stack_page(task); \
636 : __ptr += THREAD_SIZE - TOP_OF_KERNEL_STACK_PADDING; \
637 : ((struct pt_regs *)__ptr) - 1; \
638 : })
639 :
640 : #ifdef CONFIG_X86_32
641 : #define INIT_THREAD { \
642 : .sp0 = TOP_OF_INIT_STACK, \
643 : .sysenter_cs = __KERNEL_CS, \
644 : }
645 :
646 : #define KSTK_ESP(task) (task_pt_regs(task)->sp)
647 :
648 : #else
649 : extern unsigned long __end_init_task[];
650 :
651 : #define INIT_THREAD { \
652 : .sp = (unsigned long)&__end_init_task - sizeof(struct pt_regs), \
653 : }
654 :
655 : extern unsigned long KSTK_ESP(struct task_struct *task);
656 :
657 : #endif /* CONFIG_X86_64 */
658 :
659 : extern void start_thread(struct pt_regs *regs, unsigned long new_ip,
660 : unsigned long new_sp);
661 :
662 : /*
663 : * This decides where the kernel will search for a free chunk of vm
664 : * space during mmap's.
665 : */
666 : #define __TASK_UNMAPPED_BASE(task_size) (PAGE_ALIGN(task_size / 3))
667 : #define TASK_UNMAPPED_BASE __TASK_UNMAPPED_BASE(TASK_SIZE_LOW)
668 :
669 : #define KSTK_EIP(task) (task_pt_regs(task)->ip)
670 :
671 : /* Get/set a process' ability to use the timestamp counter instruction */
672 : #define GET_TSC_CTL(adr) get_tsc_mode((adr))
673 : #define SET_TSC_CTL(val) set_tsc_mode((val))
674 :
675 : extern int get_tsc_mode(unsigned long adr);
676 : extern int set_tsc_mode(unsigned int val);
677 :
678 : DECLARE_PER_CPU(u64, msr_misc_features_shadow);
679 :
680 : extern u16 get_llc_id(unsigned int cpu);
681 :
682 : #ifdef CONFIG_CPU_SUP_AMD
683 : extern u32 amd_get_nodes_per_socket(void);
684 : extern u32 amd_get_highest_perf(void);
685 : #else
686 : static inline u32 amd_get_nodes_per_socket(void) { return 0; }
687 : static inline u32 amd_get_highest_perf(void) { return 0; }
688 : #endif
689 :
690 : extern unsigned long arch_align_stack(unsigned long sp);
691 : void free_init_pages(const char *what, unsigned long begin, unsigned long end);
692 : extern void free_kernel_image_pages(const char *what, void *begin, void *end);
693 :
694 : void default_idle(void);
695 : #ifdef CONFIG_XEN
696 : bool xen_set_default_idle(void);
697 : #else
698 : #define xen_set_default_idle 0
699 : #endif
700 :
701 : void __noreturn stop_this_cpu(void *dummy);
702 : void microcode_check(struct cpuinfo_x86 *prev_info);
703 : void store_cpu_caps(struct cpuinfo_x86 *info);
704 :
705 : enum l1tf_mitigations {
706 : L1TF_MITIGATION_OFF,
707 : L1TF_MITIGATION_FLUSH_NOWARN,
708 : L1TF_MITIGATION_FLUSH,
709 : L1TF_MITIGATION_FLUSH_NOSMT,
710 : L1TF_MITIGATION_FULL,
711 : L1TF_MITIGATION_FULL_FORCE
712 : };
713 :
714 : extern enum l1tf_mitigations l1tf_mitigation;
715 :
716 : enum mds_mitigations {
717 : MDS_MITIGATION_OFF,
718 : MDS_MITIGATION_FULL,
719 : MDS_MITIGATION_VMWERV,
720 : };
721 :
722 : #ifdef CONFIG_X86_SGX
723 : int arch_memory_failure(unsigned long pfn, int flags);
724 : #define arch_memory_failure arch_memory_failure
725 :
726 : bool arch_is_platform_page(u64 paddr);
727 : #define arch_is_platform_page arch_is_platform_page
728 : #endif
729 :
730 : #endif /* _ASM_X86_PROCESSOR_H */
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