1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_X86_PROCESSOR_H
3 #define _ASM_X86_PROCESSOR_H
5 #include <asm/processor-flags.h>
7 /* Forward declaration, a strange C thing */
12 #include <asm/math_emu.h>
13 #include <asm/segment.h>
14 #include <asm/types.h>
15 #include <uapi/asm/sigcontext.h>
16 #include <asm/current.h>
17 #include <asm/cpufeatures.h>
19 #include <asm/pgtable_types.h>
20 #include <asm/percpu.h>
22 #include <asm/desc_defs.h>
24 #include <asm/special_insns.h>
25 #include <asm/fpu/types.h>
26 #include <asm/unwind_hints.h>
28 #include <linux/personality.h>
29 #include <linux/cache.h>
30 #include <linux/threads.h>
31 #include <linux/math64.h>
32 #include <linux/err.h>
33 #include <linux/irqflags.h>
34 #include <linux/mem_encrypt.h>
37 * We handle most unaligned accesses in hardware. On the other hand
38 * unaligned DMA can be quite expensive on some Nehalem processors.
40 * Based on this we disable the IP header alignment in network drivers.
42 #define NET_IP_ALIGN 0
46 * Default implementation of macro that returns current
47 * instruction pointer ("program counter").
49 static inline void *current_text_addr(void)
53 asm volatile("mov $1f, %0; 1:":"=r" (pc));
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:
63 #ifdef CONFIG_X86_VSMP
64 # define ARCH_MIN_TASKALIGN (1 << INTERNODE_CACHE_SHIFT)
65 # define ARCH_MIN_MMSTRUCT_ALIGN (1 << INTERNODE_CACHE_SHIFT)
67 # define ARCH_MIN_TASKALIGN __alignof__(union fpregs_state)
68 # define ARCH_MIN_MMSTRUCT_ALIGN 0
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];
82 extern u16 __read_mostly tlb_lld_1g[NR_INFO];
85 * CPU type and hardware bug flags. Kept separately for each CPU.
86 * Members of this structure are referenced in head_32.S, so think twice
87 * before touching them. [mj]
91 __u8 x86; /* CPU family */
92 __u8 x86_vendor; /* CPU vendor */
96 /* Number of 4K pages in DTLB/ITLB combined(in pages): */
101 /* CPUID returned core id bits: */
102 __u8 x86_coreid_bits;
104 /* Max extended CPUID function supported: */
105 __u32 extended_cpuid_level;
106 /* Maximum supported CPUID level, -1=no CPUID: */
108 __u32 x86_capability[NCAPINTS + NBUGINTS];
109 char x86_vendor_id[16];
110 char x86_model_id[64];
111 /* in KB - valid for CPUS which support this call: */
112 unsigned int x86_cache_size;
113 int x86_cache_alignment; /* In bytes */
114 /* Cache QoS architectural values: */
115 int x86_cache_max_rmid; /* max index */
116 int x86_cache_occ_scale; /* scale to bytes */
118 unsigned long loops_per_jiffy;
119 /* cpuid returned max cores value: */
123 u16 x86_clflush_size;
124 /* number of cores as seen by the OS: */
126 /* Physical processor id: */
128 /* Logical processor id: */
132 /* Index into per_cpu list: */
135 /* Address space bits used by the cache internally */
137 } __randomize_layout;
140 u32 eax, ebx, ecx, edx;
143 enum cpuid_regs_idx {
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_NUM 9
159 #define X86_VENDOR_UNKNOWN 0xff
162 * capabilities of CPUs
164 extern struct cpuinfo_x86 boot_cpu_data;
165 extern struct cpuinfo_x86 new_cpu_data;
167 extern struct x86_hw_tss doublefault_tss;
168 extern __u32 cpu_caps_cleared[NCAPINTS + NBUGINTS];
169 extern __u32 cpu_caps_set[NCAPINTS + NBUGINTS];
172 DECLARE_PER_CPU_READ_MOSTLY(struct cpuinfo_x86, cpu_info);
173 #define cpu_data(cpu) per_cpu(cpu_info, cpu)
175 #define cpu_info boot_cpu_data
176 #define cpu_data(cpu) boot_cpu_data
179 extern const struct seq_operations cpuinfo_op;
181 #define cache_line_size() (boot_cpu_data.x86_cache_alignment)
183 extern void cpu_detect(struct cpuinfo_x86 *c);
185 static inline unsigned long long l1tf_pfn_limit(void)
187 return BIT_ULL(boot_cpu_data.x86_cache_bits - 1 - PAGE_SHIFT);
190 extern void early_cpu_init(void);
191 extern void identify_boot_cpu(void);
192 extern void identify_secondary_cpu(struct cpuinfo_x86 *);
193 extern void print_cpu_info(struct cpuinfo_x86 *);
194 void print_cpu_msr(struct cpuinfo_x86 *);
195 extern void init_scattered_cpuid_features(struct cpuinfo_x86 *c);
196 extern u32 get_scattered_cpuid_leaf(unsigned int level,
197 unsigned int sub_leaf,
198 enum cpuid_regs_idx reg);
199 extern unsigned int init_intel_cacheinfo(struct cpuinfo_x86 *c);
200 extern void init_amd_cacheinfo(struct cpuinfo_x86 *c);
202 extern void detect_extended_topology(struct cpuinfo_x86 *c);
203 extern void detect_ht(struct cpuinfo_x86 *c);
206 extern int have_cpuid_p(void);
208 static inline int have_cpuid_p(void)
213 static inline void native_cpuid(unsigned int *eax, unsigned int *ebx,
214 unsigned int *ecx, unsigned int *edx)
216 /* ecx is often an input as well as an output. */
222 : "0" (*eax), "2" (*ecx)
226 #define native_cpuid_reg(reg) \
227 static inline unsigned int native_cpuid_##reg(unsigned int op) \
229 unsigned int eax = op, ebx, ecx = 0, edx; \
231 native_cpuid(&eax, &ebx, &ecx, &edx); \
237 * Native CPUID functions returning a single datum.
239 native_cpuid_reg(eax)
240 native_cpuid_reg(ebx)
241 native_cpuid_reg(ecx)
242 native_cpuid_reg(edx)
245 * Friendlier CR3 helpers.
247 static inline unsigned long read_cr3_pa(void)
249 return __read_cr3() & CR3_ADDR_MASK;
252 static inline unsigned long native_read_cr3_pa(void)
254 return __native_read_cr3() & CR3_ADDR_MASK;
257 static inline void load_cr3(pgd_t *pgdir)
259 write_cr3(__sme_pa(pgdir));
263 * Note that while the legacy 'TSS' name comes from 'Task State Segment',
264 * on modern x86 CPUs the TSS also holds information important to 64-bit mode,
265 * unrelated to the task-switch mechanism:
268 /* This is the TSS defined by the hardware. */
270 unsigned short back_link, __blh;
272 unsigned short ss0, __ss0h;
276 * We don't use ring 1, so ss1 is a convenient scratch space in
277 * the same cacheline as sp0. We use ss1 to cache the value in
278 * MSR_IA32_SYSENTER_CS. When we context switch
279 * MSR_IA32_SYSENTER_CS, we first check if the new value being
280 * written matches ss1, and, if it's not, then we wrmsr the new
281 * value and update ss1.
283 * The only reason we context switch MSR_IA32_SYSENTER_CS is
284 * that we set it to zero in vm86 tasks to avoid corrupting the
285 * stack if we were to go through the sysenter path from vm86
288 unsigned short ss1; /* MSR_IA32_SYSENTER_CS */
290 unsigned short __ss1h;
292 unsigned short ss2, __ss2h;
304 unsigned short es, __esh;
305 unsigned short cs, __csh;
306 unsigned short ss, __ssh;
307 unsigned short ds, __dsh;
308 unsigned short fs, __fsh;
309 unsigned short gs, __gsh;
310 unsigned short ldt, __ldth;
311 unsigned short trace;
312 unsigned short io_bitmap_base;
314 } __attribute__((packed));
321 * We store cpu_current_top_of_stack in sp1 so it's always accessible.
322 * Linux does not use ring 1, so sp1 is not otherwise needed.
334 } __attribute__((packed));
340 #define IO_BITMAP_BITS 65536
341 #define IO_BITMAP_BYTES (IO_BITMAP_BITS/8)
342 #define IO_BITMAP_LONGS (IO_BITMAP_BYTES/sizeof(long))
343 #define IO_BITMAP_OFFSET (offsetof(struct tss_struct, io_bitmap) - offsetof(struct tss_struct, x86_tss))
344 #define INVALID_IO_BITMAP_OFFSET 0x8000
347 char stack[PAGE_SIZE];
350 struct entry_stack_page {
351 struct entry_stack stack;
352 } __aligned(PAGE_SIZE);
356 * The fixed hardware portion. This must not cross a page boundary
357 * at risk of violating the SDM's advice and potentially triggering
360 struct x86_hw_tss x86_tss;
363 * The extra 1 is there because the CPU will access an
364 * additional byte beyond the end of the IO permission
365 * bitmap. The extra byte must be all 1 bits, and must
366 * be within the limit.
368 unsigned long io_bitmap[IO_BITMAP_LONGS + 1];
369 } __aligned(PAGE_SIZE);
371 DECLARE_PER_CPU_PAGE_ALIGNED(struct tss_struct, cpu_tss_rw);
374 * sizeof(unsigned long) coming from an extra "long" at the end
377 * -1? seg base+limit should be pointing to the address of the
380 #define __KERNEL_TSS_LIMIT \
381 (IO_BITMAP_OFFSET + IO_BITMAP_BYTES + sizeof(unsigned long) - 1)
384 DECLARE_PER_CPU(unsigned long, cpu_current_top_of_stack);
386 /* The RO copy can't be accessed with this_cpu_xyz(), so use the RW copy. */
387 #define cpu_current_top_of_stack cpu_tss_rw.x86_tss.sp1
391 * Save the original ist values for checking stack pointers during debugging
394 unsigned long ist[7];
398 DECLARE_PER_CPU(struct orig_ist, orig_ist);
400 union irq_stack_union {
401 char irq_stack[IRQ_STACK_SIZE];
403 * GCC hardcodes the stack canary as %gs:40. Since the
404 * irq_stack is the object at %gs:0, we reserve the bottom
405 * 48 bytes of the irq stack for the canary.
409 unsigned long stack_canary;
413 DECLARE_PER_CPU_FIRST(union irq_stack_union, irq_stack_union) __visible;
414 DECLARE_INIT_PER_CPU(irq_stack_union);
416 DECLARE_PER_CPU(char *, irq_stack_ptr);
417 DECLARE_PER_CPU(unsigned int, irq_count);
418 extern asmlinkage void ignore_sysret(void);
420 #ifdef CONFIG_CC_STACKPROTECTOR
422 * Make sure stack canary segment base is cached-aligned:
423 * "For Intel Atom processors, avoid non zero segment base address
424 * that is not aligned to cache line boundary at all cost."
425 * (Optim Ref Manual Assembly/Compiler Coding Rule 15.)
427 struct stack_canary {
428 char __pad[20]; /* canary at %gs:20 */
429 unsigned long canary;
431 DECLARE_PER_CPU_ALIGNED(struct stack_canary, stack_canary);
434 * per-CPU IRQ handling stacks
437 u32 stack[THREAD_SIZE/sizeof(u32)];
438 } __aligned(THREAD_SIZE);
440 DECLARE_PER_CPU(struct irq_stack *, hardirq_stack);
441 DECLARE_PER_CPU(struct irq_stack *, softirq_stack);
444 extern unsigned int fpu_kernel_xstate_size;
445 extern unsigned int fpu_user_xstate_size;
453 struct thread_struct {
454 /* Cached TLS descriptors: */
455 struct desc_struct tls_array[GDT_ENTRY_TLS_ENTRIES];
461 unsigned long sysenter_cs;
465 unsigned short fsindex;
466 unsigned short gsindex;
470 unsigned long fsbase;
471 unsigned long gsbase;
474 * XXX: this could presumably be unsigned short. Alternatively,
475 * 32-bit kernels could be taught to use fsindex instead.
481 /* Save middle states of ptrace breakpoints */
482 struct perf_event *ptrace_bps[HBP_NUM];
483 /* Debug status used for traps, single steps, etc... */
484 unsigned long debugreg6;
485 /* Keep track of the exact dr7 value set by the user */
486 unsigned long ptrace_dr7;
489 unsigned long trap_nr;
490 unsigned long error_code;
492 /* Virtual 86 mode info */
495 /* IO permissions: */
496 unsigned long *io_bitmap_ptr;
498 /* Max allowed port in the bitmap, in bytes: */
499 unsigned io_bitmap_max;
501 mm_segment_t addr_limit;
503 unsigned int sig_on_uaccess_err:1;
504 unsigned int uaccess_err:1; /* uaccess failed */
506 /* Floating point and extended processor state */
509 * WARNING: 'fpu' is dynamically-sized. It *MUST* be at
515 * Set IOPL bits in EFLAGS from given mask
517 static inline void native_set_iopl_mask(unsigned mask)
522 asm volatile ("pushfl;"
529 : "i" (~X86_EFLAGS_IOPL), "r" (mask));
534 native_load_sp0(unsigned long sp0)
536 this_cpu_write(cpu_tss_rw.x86_tss.sp0, sp0);
539 static inline void native_swapgs(void)
542 asm volatile("swapgs" ::: "memory");
546 static inline unsigned long current_top_of_stack(void)
549 * We can't read directly from tss.sp0: sp0 on x86_32 is special in
550 * and around vm86 mode and sp0 on x86_64 is special because of the
553 return this_cpu_read_stable(cpu_current_top_of_stack);
556 static inline bool on_thread_stack(void)
558 return (unsigned long)(current_top_of_stack() -
559 current_stack_pointer) < THREAD_SIZE;
562 #ifdef CONFIG_PARAVIRT
563 #include <asm/paravirt.h>
565 #define __cpuid native_cpuid
567 static inline void load_sp0(unsigned long sp0)
569 native_load_sp0(sp0);
572 #define set_iopl_mask native_set_iopl_mask
573 #endif /* CONFIG_PARAVIRT */
575 /* Free all resources held by a thread. */
576 extern void release_thread(struct task_struct *);
578 unsigned long get_wchan(struct task_struct *p);
581 * Generic CPUID function
582 * clear %ecx since some cpus (Cyrix MII) do not set or clear %ecx
583 * resulting in stale register contents being returned.
585 static inline void cpuid(unsigned int op,
586 unsigned int *eax, unsigned int *ebx,
587 unsigned int *ecx, unsigned int *edx)
591 __cpuid(eax, ebx, ecx, edx);
594 /* Some CPUID calls want 'count' to be placed in ecx */
595 static inline void cpuid_count(unsigned int op, int count,
596 unsigned int *eax, unsigned int *ebx,
597 unsigned int *ecx, unsigned int *edx)
601 __cpuid(eax, ebx, ecx, edx);
605 * CPUID functions returning a single datum
607 static inline unsigned int cpuid_eax(unsigned int op)
609 unsigned int eax, ebx, ecx, edx;
611 cpuid(op, &eax, &ebx, &ecx, &edx);
616 static inline unsigned int cpuid_ebx(unsigned int op)
618 unsigned int eax, ebx, ecx, edx;
620 cpuid(op, &eax, &ebx, &ecx, &edx);
625 static inline unsigned int cpuid_ecx(unsigned int op)
627 unsigned int eax, ebx, ecx, edx;
629 cpuid(op, &eax, &ebx, &ecx, &edx);
634 static inline unsigned int cpuid_edx(unsigned int op)
636 unsigned int eax, ebx, ecx, edx;
638 cpuid(op, &eax, &ebx, &ecx, &edx);
643 /* REP NOP (PAUSE) is a good thing to insert into busy-wait loops. */
644 static __always_inline void rep_nop(void)
646 asm volatile("rep; nop" ::: "memory");
649 static __always_inline void cpu_relax(void)
655 * This function forces the icache and prefetched instruction stream to
656 * catch up with reality in two very specific cases:
658 * a) Text was modified using one virtual address and is about to be executed
659 * from the same physical page at a different virtual address.
661 * b) Text was modified on a different CPU, may subsequently be
662 * executed on this CPU, and you want to make sure the new version
663 * gets executed. This generally means you're calling this in a IPI.
665 * If you're calling this for a different reason, you're probably doing
668 static inline void sync_core(void)
671 * There are quite a few ways to do this. IRET-to-self is nice
672 * because it works on every CPU, at any CPL (so it's compatible
673 * with paravirtualization), and it never exits to a hypervisor.
674 * The only down sides are that it's a bit slow (it seems to be
675 * a bit more than 2x slower than the fastest options) and that
676 * it unmasks NMIs. The "push %cs" is needed because, in
677 * paravirtual environments, __KERNEL_CS may not be a valid CS
678 * value when we do IRET directly.
680 * In case NMI unmasking or performance ever becomes a problem,
681 * the next best option appears to be MOV-to-CR2 and an
682 * unconditional jump. That sequence also works on all CPUs,
683 * but it will fault at CPL3 (i.e. Xen PV).
685 * CPUID is the conventional way, but it's nasty: it doesn't
686 * exist on some 486-like CPUs, and it usually exits to a
689 * Like all of Linux's memory ordering operations, this is a
690 * compiler barrier as well.
699 : ASM_CALL_CONSTRAINT : : "memory");
708 "addq $8, (%%rsp)\n\t"
716 : "=&r" (tmp), ASM_CALL_CONSTRAINT : : "cc", "memory");
720 extern void select_idle_routine(const struct cpuinfo_x86 *c);
721 extern void amd_e400_c1e_apic_setup(void);
723 extern unsigned long boot_option_idle_override;
725 enum idle_boot_override {IDLE_NO_OVERRIDE=0, IDLE_HALT, IDLE_NOMWAIT,
728 extern void enable_sep_cpu(void);
729 extern int sysenter_setup(void);
731 extern void early_trap_init(void);
732 void early_trap_pf_init(void);
734 /* Defined in head.S */
735 extern struct desc_ptr early_gdt_descr;
737 extern void cpu_set_gdt(int);
738 extern void switch_to_new_gdt(int);
739 extern void load_direct_gdt(int);
740 extern void load_fixmap_gdt(int);
741 extern void load_percpu_segment(int);
742 extern void cpu_init(void);
744 static inline unsigned long get_debugctlmsr(void)
746 unsigned long debugctlmsr = 0;
748 #ifndef CONFIG_X86_DEBUGCTLMSR
749 if (boot_cpu_data.x86 < 6)
752 rdmsrl(MSR_IA32_DEBUGCTLMSR, debugctlmsr);
757 static inline void update_debugctlmsr(unsigned long debugctlmsr)
759 #ifndef CONFIG_X86_DEBUGCTLMSR
760 if (boot_cpu_data.x86 < 6)
763 wrmsrl(MSR_IA32_DEBUGCTLMSR, debugctlmsr);
766 extern void set_task_blockstep(struct task_struct *task, bool on);
768 /* Boot loader type from the setup header: */
769 extern int bootloader_type;
770 extern int bootloader_version;
772 extern char ignore_fpu_irq;
774 #define HAVE_ARCH_PICK_MMAP_LAYOUT 1
775 #define ARCH_HAS_PREFETCHW
776 #define ARCH_HAS_SPINLOCK_PREFETCH
779 # define BASE_PREFETCH ""
780 # define ARCH_HAS_PREFETCH
782 # define BASE_PREFETCH "prefetcht0 %P1"
786 * Prefetch instructions for Pentium III (+) and AMD Athlon (+)
788 * It's not worth to care about 3dnow prefetches for the K6
789 * because they are microcoded there and very slow.
791 static inline void prefetch(const void *x)
793 alternative_input(BASE_PREFETCH, "prefetchnta %P1",
795 "m" (*(const char *)x));
799 * 3dnow prefetch to get an exclusive cache line.
800 * Useful for spinlocks to avoid one state transition in the
801 * cache coherency protocol:
803 static inline void prefetchw(const void *x)
805 alternative_input(BASE_PREFETCH, "prefetchw %P1",
806 X86_FEATURE_3DNOWPREFETCH,
807 "m" (*(const char *)x));
810 static inline void spin_lock_prefetch(const void *x)
815 #define TOP_OF_INIT_STACK ((unsigned long)&init_stack + sizeof(init_stack) - \
816 TOP_OF_KERNEL_STACK_PADDING)
818 #define task_top_of_stack(task) ((unsigned long)(task_pt_regs(task) + 1))
820 #define task_pt_regs(task) \
822 unsigned long __ptr = (unsigned long)task_stack_page(task); \
823 __ptr += THREAD_SIZE - TOP_OF_KERNEL_STACK_PADDING; \
824 ((struct pt_regs *)__ptr) - 1; \
829 * User space process size: 3GB (default).
831 #define IA32_PAGE_OFFSET PAGE_OFFSET
832 #define TASK_SIZE PAGE_OFFSET
833 #define TASK_SIZE_LOW TASK_SIZE
834 #define TASK_SIZE_MAX TASK_SIZE
835 #define DEFAULT_MAP_WINDOW TASK_SIZE
836 #define STACK_TOP TASK_SIZE
837 #define STACK_TOP_MAX STACK_TOP
839 #define INIT_THREAD { \
840 .sp0 = TOP_OF_INIT_STACK, \
841 .sysenter_cs = __KERNEL_CS, \
842 .io_bitmap_ptr = NULL, \
843 .addr_limit = KERNEL_DS, \
846 #define KSTK_ESP(task) (task_pt_regs(task)->sp)
850 * User space process size. This is the first address outside the user range.
851 * There are a few constraints that determine this:
853 * On Intel CPUs, if a SYSCALL instruction is at the highest canonical
854 * address, then that syscall will enter the kernel with a
855 * non-canonical return address, and SYSRET will explode dangerously.
856 * We avoid this particular problem by preventing anything executable
857 * from being mapped at the maximum canonical address.
859 * On AMD CPUs in the Ryzen family, there's a nasty bug in which the
860 * CPUs malfunction if they execute code from the highest canonical page.
861 * They'll speculate right off the end of the canonical space, and
862 * bad things happen. This is worked around in the same way as the
865 * With page table isolation enabled, we map the LDT in ... [stay tuned]
867 #define TASK_SIZE_MAX ((1UL << __VIRTUAL_MASK_SHIFT) - PAGE_SIZE)
869 #define DEFAULT_MAP_WINDOW ((1UL << 47) - PAGE_SIZE)
871 /* This decides where the kernel will search for a free chunk of vm
872 * space during mmap's.
874 #define IA32_PAGE_OFFSET ((current->personality & ADDR_LIMIT_3GB) ? \
875 0xc0000000 : 0xFFFFe000)
877 #define TASK_SIZE_LOW (test_thread_flag(TIF_ADDR32) ? \
878 IA32_PAGE_OFFSET : DEFAULT_MAP_WINDOW)
879 #define TASK_SIZE (test_thread_flag(TIF_ADDR32) ? \
880 IA32_PAGE_OFFSET : TASK_SIZE_MAX)
881 #define TASK_SIZE_OF(child) ((test_tsk_thread_flag(child, TIF_ADDR32)) ? \
882 IA32_PAGE_OFFSET : TASK_SIZE_MAX)
884 #define STACK_TOP TASK_SIZE_LOW
885 #define STACK_TOP_MAX TASK_SIZE_MAX
887 #define INIT_THREAD { \
888 .addr_limit = KERNEL_DS, \
891 extern unsigned long KSTK_ESP(struct task_struct *task);
893 #endif /* CONFIG_X86_64 */
895 extern void start_thread(struct pt_regs *regs, unsigned long new_ip,
896 unsigned long new_sp);
899 * This decides where the kernel will search for a free chunk of vm
900 * space during mmap's.
902 #define __TASK_UNMAPPED_BASE(task_size) (PAGE_ALIGN(task_size / 3))
903 #define TASK_UNMAPPED_BASE __TASK_UNMAPPED_BASE(TASK_SIZE_LOW)
905 #define KSTK_EIP(task) (task_pt_regs(task)->ip)
907 /* Get/set a process' ability to use the timestamp counter instruction */
908 #define GET_TSC_CTL(adr) get_tsc_mode((adr))
909 #define SET_TSC_CTL(val) set_tsc_mode((val))
911 extern int get_tsc_mode(unsigned long adr);
912 extern int set_tsc_mode(unsigned int val);
914 DECLARE_PER_CPU(u64, msr_misc_features_shadow);
916 /* Register/unregister a process' MPX related resource */
917 #define MPX_ENABLE_MANAGEMENT() mpx_enable_management()
918 #define MPX_DISABLE_MANAGEMENT() mpx_disable_management()
920 #ifdef CONFIG_X86_INTEL_MPX
921 extern int mpx_enable_management(void);
922 extern int mpx_disable_management(void);
924 static inline int mpx_enable_management(void)
928 static inline int mpx_disable_management(void)
932 #endif /* CONFIG_X86_INTEL_MPX */
934 #ifdef CONFIG_CPU_SUP_AMD
935 extern u16 amd_get_nb_id(int cpu);
936 extern u32 amd_get_nodes_per_socket(void);
938 static inline u16 amd_get_nb_id(int cpu) { return 0; }
939 static inline u32 amd_get_nodes_per_socket(void) { return 0; }
942 static inline uint32_t hypervisor_cpuid_base(const char *sig, uint32_t leaves)
944 uint32_t base, eax, signature[3];
946 for (base = 0x40000000; base < 0x40010000; base += 0x100) {
947 cpuid(base, &eax, &signature[0], &signature[1], &signature[2]);
949 if (!memcmp(sig, signature, 12) &&
950 (leaves == 0 || ((eax - base) >= leaves)))
957 extern unsigned long arch_align_stack(unsigned long sp);
958 extern void free_init_pages(char *what, unsigned long begin, unsigned long end);
960 void default_idle(void);
962 bool xen_set_default_idle(void);
964 #define xen_set_default_idle 0
967 void stop_this_cpu(void *dummy);
968 void df_debug(struct pt_regs *regs, long error_code);
969 void microcode_check(void);
971 enum l1tf_mitigations {
973 L1TF_MITIGATION_FLUSH_NOWARN,
974 L1TF_MITIGATION_FLUSH,
975 L1TF_MITIGATION_FLUSH_NOSMT,
976 L1TF_MITIGATION_FULL,
977 L1TF_MITIGATION_FULL_FORCE
980 extern enum l1tf_mitigations l1tf_mitigation;
982 enum mds_mitigations {
985 MDS_MITIGATION_VMWERV,
988 enum taa_mitigations {
990 TAA_MITIGATION_UCODE_NEEDED,
992 TAA_MITIGATION_TSX_DISABLED,
995 #endif /* _ASM_X86_PROCESSOR_H */