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: */
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 } __randomize_layout;
138 u32 eax, ebx, ecx, edx;
141 enum cpuid_regs_idx {
148 #define X86_VENDOR_INTEL 0
149 #define X86_VENDOR_CYRIX 1
150 #define X86_VENDOR_AMD 2
151 #define X86_VENDOR_UMC 3
152 #define X86_VENDOR_CENTAUR 5
153 #define X86_VENDOR_TRANSMETA 7
154 #define X86_VENDOR_NSC 8
155 #define X86_VENDOR_NUM 9
157 #define X86_VENDOR_UNKNOWN 0xff
160 * capabilities of CPUs
162 extern struct cpuinfo_x86 boot_cpu_data;
163 extern struct cpuinfo_x86 new_cpu_data;
165 extern struct x86_hw_tss doublefault_tss;
166 extern __u32 cpu_caps_cleared[NCAPINTS];
167 extern __u32 cpu_caps_set[NCAPINTS];
170 DECLARE_PER_CPU_READ_MOSTLY(struct cpuinfo_x86, cpu_info);
171 #define cpu_data(cpu) per_cpu(cpu_info, cpu)
173 #define cpu_info boot_cpu_data
174 #define cpu_data(cpu) boot_cpu_data
177 extern const struct seq_operations cpuinfo_op;
179 #define cache_line_size() (boot_cpu_data.x86_cache_alignment)
181 extern void cpu_detect(struct cpuinfo_x86 *c);
183 extern void early_cpu_init(void);
184 extern void identify_boot_cpu(void);
185 extern void identify_secondary_cpu(struct cpuinfo_x86 *);
186 extern void print_cpu_info(struct cpuinfo_x86 *);
187 void print_cpu_msr(struct cpuinfo_x86 *);
188 extern void init_scattered_cpuid_features(struct cpuinfo_x86 *c);
189 extern u32 get_scattered_cpuid_leaf(unsigned int level,
190 unsigned int sub_leaf,
191 enum cpuid_regs_idx reg);
192 extern unsigned int init_intel_cacheinfo(struct cpuinfo_x86 *c);
193 extern void init_amd_cacheinfo(struct cpuinfo_x86 *c);
195 extern void detect_extended_topology(struct cpuinfo_x86 *c);
196 extern void detect_ht(struct cpuinfo_x86 *c);
199 extern int have_cpuid_p(void);
201 static inline int have_cpuid_p(void)
206 static inline void native_cpuid(unsigned int *eax, unsigned int *ebx,
207 unsigned int *ecx, unsigned int *edx)
209 /* ecx is often an input as well as an output. */
215 : "0" (*eax), "2" (*ecx)
219 #define native_cpuid_reg(reg) \
220 static inline unsigned int native_cpuid_##reg(unsigned int op) \
222 unsigned int eax = op, ebx, ecx = 0, edx; \
224 native_cpuid(&eax, &ebx, &ecx, &edx); \
230 * Native CPUID functions returning a single datum.
232 native_cpuid_reg(eax)
233 native_cpuid_reg(ebx)
234 native_cpuid_reg(ecx)
235 native_cpuid_reg(edx)
238 * Friendlier CR3 helpers.
240 static inline unsigned long read_cr3_pa(void)
242 return __read_cr3() & CR3_ADDR_MASK;
245 static inline unsigned long native_read_cr3_pa(void)
247 return __native_read_cr3() & CR3_ADDR_MASK;
250 static inline void load_cr3(pgd_t *pgdir)
252 write_cr3(__sme_pa(pgdir));
256 * Note that while the legacy 'TSS' name comes from 'Task State Segment',
257 * on modern x86 CPUs the TSS also holds information important to 64-bit mode,
258 * unrelated to the task-switch mechanism:
261 /* This is the TSS defined by the hardware. */
263 unsigned short back_link, __blh;
265 unsigned short ss0, __ss0h;
269 * We don't use ring 1, so ss1 is a convenient scratch space in
270 * the same cacheline as sp0. We use ss1 to cache the value in
271 * MSR_IA32_SYSENTER_CS. When we context switch
272 * MSR_IA32_SYSENTER_CS, we first check if the new value being
273 * written matches ss1, and, if it's not, then we wrmsr the new
274 * value and update ss1.
276 * The only reason we context switch MSR_IA32_SYSENTER_CS is
277 * that we set it to zero in vm86 tasks to avoid corrupting the
278 * stack if we were to go through the sysenter path from vm86
281 unsigned short ss1; /* MSR_IA32_SYSENTER_CS */
283 unsigned short __ss1h;
285 unsigned short ss2, __ss2h;
297 unsigned short es, __esh;
298 unsigned short cs, __csh;
299 unsigned short ss, __ssh;
300 unsigned short ds, __dsh;
301 unsigned short fs, __fsh;
302 unsigned short gs, __gsh;
303 unsigned short ldt, __ldth;
304 unsigned short trace;
305 unsigned short io_bitmap_base;
307 } __attribute__((packed));
321 } __attribute__((packed));
327 #define IO_BITMAP_BITS 65536
328 #define IO_BITMAP_BYTES (IO_BITMAP_BITS/8)
329 #define IO_BITMAP_LONGS (IO_BITMAP_BYTES/sizeof(long))
330 #define IO_BITMAP_OFFSET (offsetof(struct tss_struct, io_bitmap) - offsetof(struct tss_struct, x86_tss))
331 #define INVALID_IO_BITMAP_OFFSET 0x8000
335 * The hardware state:
337 struct x86_hw_tss x86_tss;
340 * The extra 1 is there because the CPU will access an
341 * additional byte beyond the end of the IO permission
342 * bitmap. The extra byte must be all 1 bits, and must
343 * be within the limit.
345 unsigned long io_bitmap[IO_BITMAP_LONGS + 1];
348 * Space for the temporary SYSENTER stack.
350 unsigned long SYSENTER_stack_canary;
351 unsigned long SYSENTER_stack[64];
352 } ____cacheline_aligned;
354 DECLARE_PER_CPU_SHARED_ALIGNED(struct tss_struct, cpu_tss);
357 * sizeof(unsigned long) coming from an extra "long" at the end
360 * -1? seg base+limit should be pointing to the address of the
363 #define __KERNEL_TSS_LIMIT \
364 (IO_BITMAP_OFFSET + IO_BITMAP_BYTES + sizeof(unsigned long) - 1)
367 DECLARE_PER_CPU(unsigned long, cpu_current_top_of_stack);
371 * Save the original ist values for checking stack pointers during debugging
374 unsigned long ist[7];
378 DECLARE_PER_CPU(struct orig_ist, orig_ist);
380 union irq_stack_union {
381 char irq_stack[IRQ_STACK_SIZE];
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.
389 unsigned long stack_canary;
393 DECLARE_PER_CPU_FIRST(union irq_stack_union, irq_stack_union) __visible;
394 DECLARE_INIT_PER_CPU(irq_stack_union);
396 DECLARE_PER_CPU(char *, irq_stack_ptr);
397 DECLARE_PER_CPU(unsigned int, irq_count);
398 extern asmlinkage void ignore_sysret(void);
400 #ifdef CONFIG_CC_STACKPROTECTOR
402 * Make sure stack canary segment base is cached-aligned:
403 * "For Intel Atom processors, avoid non zero segment base address
404 * that is not aligned to cache line boundary at all cost."
405 * (Optim Ref Manual Assembly/Compiler Coding Rule 15.)
407 struct stack_canary {
408 char __pad[20]; /* canary at %gs:20 */
409 unsigned long canary;
411 DECLARE_PER_CPU_ALIGNED(struct stack_canary, stack_canary);
414 * per-CPU IRQ handling stacks
417 u32 stack[THREAD_SIZE/sizeof(u32)];
418 } __aligned(THREAD_SIZE);
420 DECLARE_PER_CPU(struct irq_stack *, hardirq_stack);
421 DECLARE_PER_CPU(struct irq_stack *, softirq_stack);
424 extern unsigned int fpu_kernel_xstate_size;
425 extern unsigned int fpu_user_xstate_size;
433 struct thread_struct {
434 /* Cached TLS descriptors: */
435 struct desc_struct tls_array[GDT_ENTRY_TLS_ENTRIES];
441 unsigned long sysenter_cs;
445 unsigned short fsindex;
446 unsigned short gsindex;
449 u32 status; /* thread synchronous flags */
452 unsigned long fsbase;
453 unsigned long gsbase;
456 * XXX: this could presumably be unsigned short. Alternatively,
457 * 32-bit kernels could be taught to use fsindex instead.
463 /* Save middle states of ptrace breakpoints */
464 struct perf_event *ptrace_bps[HBP_NUM];
465 /* Debug status used for traps, single steps, etc... */
466 unsigned long debugreg6;
467 /* Keep track of the exact dr7 value set by the user */
468 unsigned long ptrace_dr7;
471 unsigned long trap_nr;
472 unsigned long error_code;
474 /* Virtual 86 mode info */
477 /* IO permissions: */
478 unsigned long *io_bitmap_ptr;
480 /* Max allowed port in the bitmap, in bytes: */
481 unsigned io_bitmap_max;
483 mm_segment_t addr_limit;
485 unsigned int sig_on_uaccess_err:1;
486 unsigned int uaccess_err:1; /* uaccess failed */
488 /* Floating point and extended processor state */
491 * WARNING: 'fpu' is dynamically-sized. It *MUST* be at
497 * Thread-synchronous status.
499 * This is different from the flags in that nobody else
500 * ever touches our thread-synchronous status, so we don't
501 * have to worry about atomic accesses.
503 #define TS_COMPAT 0x0002 /* 32bit syscall active (64BIT)*/
506 * Set IOPL bits in EFLAGS from given mask
508 static inline void native_set_iopl_mask(unsigned mask)
513 asm volatile ("pushfl;"
520 : "i" (~X86_EFLAGS_IOPL), "r" (mask));
525 native_load_sp0(unsigned long sp0)
527 this_cpu_write(cpu_tss.x86_tss.sp0, sp0);
530 static inline void native_swapgs(void)
533 asm volatile("swapgs" ::: "memory");
537 static inline unsigned long current_top_of_stack(void)
540 return this_cpu_read_stable(cpu_tss.x86_tss.sp0);
542 /* sp0 on x86_32 is special in and around vm86 mode. */
543 return this_cpu_read_stable(cpu_current_top_of_stack);
547 static inline bool on_thread_stack(void)
549 return (unsigned long)(current_top_of_stack() -
550 current_stack_pointer) < THREAD_SIZE;
553 #ifdef CONFIG_PARAVIRT
554 #include <asm/paravirt.h>
556 #define __cpuid native_cpuid
558 static inline void load_sp0(unsigned long sp0)
560 native_load_sp0(sp0);
563 #define set_iopl_mask native_set_iopl_mask
564 #endif /* CONFIG_PARAVIRT */
566 /* Free all resources held by a thread. */
567 extern void release_thread(struct task_struct *);
569 unsigned long get_wchan(struct task_struct *p);
572 * Generic CPUID function
573 * clear %ecx since some cpus (Cyrix MII) do not set or clear %ecx
574 * resulting in stale register contents being returned.
576 static inline void cpuid(unsigned int op,
577 unsigned int *eax, unsigned int *ebx,
578 unsigned int *ecx, unsigned int *edx)
582 __cpuid(eax, ebx, ecx, edx);
585 /* Some CPUID calls want 'count' to be placed in ecx */
586 static inline void cpuid_count(unsigned int op, int count,
587 unsigned int *eax, unsigned int *ebx,
588 unsigned int *ecx, unsigned int *edx)
592 __cpuid(eax, ebx, ecx, edx);
596 * CPUID functions returning a single datum
598 static inline unsigned int cpuid_eax(unsigned int op)
600 unsigned int eax, ebx, ecx, edx;
602 cpuid(op, &eax, &ebx, &ecx, &edx);
607 static inline unsigned int cpuid_ebx(unsigned int op)
609 unsigned int eax, ebx, ecx, edx;
611 cpuid(op, &eax, &ebx, &ecx, &edx);
616 static inline unsigned int cpuid_ecx(unsigned int op)
618 unsigned int eax, ebx, ecx, edx;
620 cpuid(op, &eax, &ebx, &ecx, &edx);
625 static inline unsigned int cpuid_edx(unsigned int op)
627 unsigned int eax, ebx, ecx, edx;
629 cpuid(op, &eax, &ebx, &ecx, &edx);
634 /* REP NOP (PAUSE) is a good thing to insert into busy-wait loops. */
635 static __always_inline void rep_nop(void)
637 asm volatile("rep; nop" ::: "memory");
640 static __always_inline void cpu_relax(void)
646 * This function forces the icache and prefetched instruction stream to
647 * catch up with reality in two very specific cases:
649 * a) Text was modified using one virtual address and is about to be executed
650 * from the same physical page at a different virtual address.
652 * b) Text was modified on a different CPU, may subsequently be
653 * executed on this CPU, and you want to make sure the new version
654 * gets executed. This generally means you're calling this in a IPI.
656 * If you're calling this for a different reason, you're probably doing
659 static inline void sync_core(void)
662 * There are quite a few ways to do this. IRET-to-self is nice
663 * because it works on every CPU, at any CPL (so it's compatible
664 * with paravirtualization), and it never exits to a hypervisor.
665 * The only down sides are that it's a bit slow (it seems to be
666 * a bit more than 2x slower than the fastest options) and that
667 * it unmasks NMIs. The "push %cs" is needed because, in
668 * paravirtual environments, __KERNEL_CS may not be a valid CS
669 * value when we do IRET directly.
671 * In case NMI unmasking or performance ever becomes a problem,
672 * the next best option appears to be MOV-to-CR2 and an
673 * unconditional jump. That sequence also works on all CPUs,
674 * but it will fault at CPL3 (i.e. Xen PV).
676 * CPUID is the conventional way, but it's nasty: it doesn't
677 * exist on some 486-like CPUs, and it usually exits to a
680 * Like all of Linux's memory ordering operations, this is a
681 * compiler barrier as well.
690 : ASM_CALL_CONSTRAINT : : "memory");
699 "addq $8, (%%rsp)\n\t"
707 : "=&r" (tmp), ASM_CALL_CONSTRAINT : : "cc", "memory");
711 extern void select_idle_routine(const struct cpuinfo_x86 *c);
712 extern void amd_e400_c1e_apic_setup(void);
714 extern unsigned long boot_option_idle_override;
716 enum idle_boot_override {IDLE_NO_OVERRIDE=0, IDLE_HALT, IDLE_NOMWAIT,
719 extern void enable_sep_cpu(void);
720 extern int sysenter_setup(void);
722 extern void early_trap_init(void);
723 void early_trap_pf_init(void);
725 /* Defined in head.S */
726 extern struct desc_ptr early_gdt_descr;
728 extern void cpu_set_gdt(int);
729 extern void switch_to_new_gdt(int);
730 extern void load_direct_gdt(int);
731 extern void load_fixmap_gdt(int);
732 extern void load_percpu_segment(int);
733 extern void cpu_init(void);
735 static inline unsigned long get_debugctlmsr(void)
737 unsigned long debugctlmsr = 0;
739 #ifndef CONFIG_X86_DEBUGCTLMSR
740 if (boot_cpu_data.x86 < 6)
743 rdmsrl(MSR_IA32_DEBUGCTLMSR, debugctlmsr);
748 static inline void update_debugctlmsr(unsigned long debugctlmsr)
750 #ifndef CONFIG_X86_DEBUGCTLMSR
751 if (boot_cpu_data.x86 < 6)
754 wrmsrl(MSR_IA32_DEBUGCTLMSR, debugctlmsr);
757 extern void set_task_blockstep(struct task_struct *task, bool on);
759 /* Boot loader type from the setup header: */
760 extern int bootloader_type;
761 extern int bootloader_version;
763 extern char ignore_fpu_irq;
765 #define HAVE_ARCH_PICK_MMAP_LAYOUT 1
766 #define ARCH_HAS_PREFETCHW
767 #define ARCH_HAS_SPINLOCK_PREFETCH
770 # define BASE_PREFETCH ""
771 # define ARCH_HAS_PREFETCH
773 # define BASE_PREFETCH "prefetcht0 %P1"
777 * Prefetch instructions for Pentium III (+) and AMD Athlon (+)
779 * It's not worth to care about 3dnow prefetches for the K6
780 * because they are microcoded there and very slow.
782 static inline void prefetch(const void *x)
784 alternative_input(BASE_PREFETCH, "prefetchnta %P1",
786 "m" (*(const char *)x));
790 * 3dnow prefetch to get an exclusive cache line.
791 * Useful for spinlocks to avoid one state transition in the
792 * cache coherency protocol:
794 static inline void prefetchw(const void *x)
796 alternative_input(BASE_PREFETCH, "prefetchw %P1",
797 X86_FEATURE_3DNOWPREFETCH,
798 "m" (*(const char *)x));
801 static inline void spin_lock_prefetch(const void *x)
806 #define TOP_OF_INIT_STACK ((unsigned long)&init_stack + sizeof(init_stack) - \
807 TOP_OF_KERNEL_STACK_PADDING)
809 #define task_top_of_stack(task) ((unsigned long)(task_pt_regs(task) + 1))
811 #define task_pt_regs(task) \
813 unsigned long __ptr = (unsigned long)task_stack_page(task); \
814 __ptr += THREAD_SIZE - TOP_OF_KERNEL_STACK_PADDING; \
815 ((struct pt_regs *)__ptr) - 1; \
820 * User space process size: 3GB (default).
822 #define IA32_PAGE_OFFSET PAGE_OFFSET
823 #define TASK_SIZE PAGE_OFFSET
824 #define TASK_SIZE_LOW TASK_SIZE
825 #define TASK_SIZE_MAX TASK_SIZE
826 #define DEFAULT_MAP_WINDOW TASK_SIZE
827 #define STACK_TOP TASK_SIZE
828 #define STACK_TOP_MAX STACK_TOP
830 #define INIT_THREAD { \
831 .sp0 = TOP_OF_INIT_STACK, \
832 .sysenter_cs = __KERNEL_CS, \
833 .io_bitmap_ptr = NULL, \
834 .addr_limit = KERNEL_DS, \
837 #define KSTK_ESP(task) (task_pt_regs(task)->sp)
841 * User space process size. 47bits minus one guard page. The guard
842 * page is necessary on Intel CPUs: if a SYSCALL instruction is at
843 * the highest possible canonical userspace address, then that
844 * syscall will enter the kernel with a non-canonical return
845 * address, and SYSRET will explode dangerously. We avoid this
846 * particular problem by preventing anything from being mapped
847 * at the maximum canonical address.
849 #define TASK_SIZE_MAX ((1UL << __VIRTUAL_MASK_SHIFT) - PAGE_SIZE)
851 #define DEFAULT_MAP_WINDOW ((1UL << 47) - PAGE_SIZE)
853 /* This decides where the kernel will search for a free chunk of vm
854 * space during mmap's.
856 #define IA32_PAGE_OFFSET ((current->personality & ADDR_LIMIT_3GB) ? \
857 0xc0000000 : 0xFFFFe000)
859 #define TASK_SIZE_LOW (test_thread_flag(TIF_ADDR32) ? \
860 IA32_PAGE_OFFSET : DEFAULT_MAP_WINDOW)
861 #define TASK_SIZE (test_thread_flag(TIF_ADDR32) ? \
862 IA32_PAGE_OFFSET : TASK_SIZE_MAX)
863 #define TASK_SIZE_OF(child) ((test_tsk_thread_flag(child, TIF_ADDR32)) ? \
864 IA32_PAGE_OFFSET : TASK_SIZE_MAX)
866 #define STACK_TOP TASK_SIZE_LOW
867 #define STACK_TOP_MAX TASK_SIZE_MAX
869 #define INIT_THREAD { \
870 .addr_limit = KERNEL_DS, \
873 extern unsigned long KSTK_ESP(struct task_struct *task);
875 #endif /* CONFIG_X86_64 */
877 extern void start_thread(struct pt_regs *regs, unsigned long new_ip,
878 unsigned long new_sp);
881 * This decides where the kernel will search for a free chunk of vm
882 * space during mmap's.
884 #define __TASK_UNMAPPED_BASE(task_size) (PAGE_ALIGN(task_size / 3))
885 #define TASK_UNMAPPED_BASE __TASK_UNMAPPED_BASE(TASK_SIZE_LOW)
887 #define KSTK_EIP(task) (task_pt_regs(task)->ip)
889 /* Get/set a process' ability to use the timestamp counter instruction */
890 #define GET_TSC_CTL(adr) get_tsc_mode((adr))
891 #define SET_TSC_CTL(val) set_tsc_mode((val))
893 extern int get_tsc_mode(unsigned long adr);
894 extern int set_tsc_mode(unsigned int val);
896 DECLARE_PER_CPU(u64, msr_misc_features_shadow);
898 /* Register/unregister a process' MPX related resource */
899 #define MPX_ENABLE_MANAGEMENT() mpx_enable_management()
900 #define MPX_DISABLE_MANAGEMENT() mpx_disable_management()
902 #ifdef CONFIG_X86_INTEL_MPX
903 extern int mpx_enable_management(void);
904 extern int mpx_disable_management(void);
906 static inline int mpx_enable_management(void)
910 static inline int mpx_disable_management(void)
914 #endif /* CONFIG_X86_INTEL_MPX */
916 #ifdef CONFIG_CPU_SUP_AMD
917 extern u16 amd_get_nb_id(int cpu);
918 extern u32 amd_get_nodes_per_socket(void);
920 static inline u16 amd_get_nb_id(int cpu) { return 0; }
921 static inline u32 amd_get_nodes_per_socket(void) { return 0; }
924 static inline uint32_t hypervisor_cpuid_base(const char *sig, uint32_t leaves)
926 uint32_t base, eax, signature[3];
928 for (base = 0x40000000; base < 0x40010000; base += 0x100) {
929 cpuid(base, &eax, &signature[0], &signature[1], &signature[2]);
931 if (!memcmp(sig, signature, 12) &&
932 (leaves == 0 || ((eax - base) >= leaves)))
939 extern unsigned long arch_align_stack(unsigned long sp);
940 extern void free_init_pages(char *what, unsigned long begin, unsigned long end);
942 void default_idle(void);
944 bool xen_set_default_idle(void);
946 #define xen_set_default_idle 0
949 void stop_this_cpu(void *dummy);
950 void df_debug(struct pt_regs *regs, long error_code);
951 #endif /* _ASM_X86_PROCESSOR_H */