1 #ifndef _ASM_X86_PROCESSOR_H
2 #define _ASM_X86_PROCESSOR_H
4 #include <asm/processor-flags.h>
6 /* Forward declaration, a strange C thing */
11 #include <asm/math_emu.h>
12 #include <asm/segment.h>
13 #include <asm/types.h>
14 #include <uapi/asm/sigcontext.h>
15 #include <asm/current.h>
16 #include <asm/cpufeatures.h>
18 #include <asm/pgtable_types.h>
19 #include <asm/percpu.h>
21 #include <asm/desc_defs.h>
23 #include <asm/special_insns.h>
24 #include <asm/fpu/types.h>
26 #include <linux/personality.h>
27 #include <linux/cache.h>
28 #include <linux/threads.h>
29 #include <linux/math64.h>
30 #include <linux/err.h>
31 #include <linux/irqflags.h>
34 * We handle most unaligned accesses in hardware. On the other hand
35 * unaligned DMA can be quite expensive on some Nehalem processors.
37 * Based on this we disable the IP header alignment in network drivers.
39 #define NET_IP_ALIGN 0
43 * Default implementation of macro that returns current
44 * instruction pointer ("program counter").
46 static inline void *current_text_addr(void)
50 asm volatile("mov $1f, %0; 1:":"=r" (pc
));
56 * These alignment constraints are for performance in the vSMP case,
57 * but in the task_struct case we must also meet hardware imposed
58 * alignment requirements of the FPU state:
60 #ifdef CONFIG_X86_VSMP
61 # define ARCH_MIN_TASKALIGN (1 << INTERNODE_CACHE_SHIFT)
62 # define ARCH_MIN_MMSTRUCT_ALIGN (1 << INTERNODE_CACHE_SHIFT)
64 # define ARCH_MIN_TASKALIGN __alignof__(union fpregs_state)
65 # define ARCH_MIN_MMSTRUCT_ALIGN 0
73 extern u16 __read_mostly tlb_lli_4k
[NR_INFO
];
74 extern u16 __read_mostly tlb_lli_2m
[NR_INFO
];
75 extern u16 __read_mostly tlb_lli_4m
[NR_INFO
];
76 extern u16 __read_mostly tlb_lld_4k
[NR_INFO
];
77 extern u16 __read_mostly tlb_lld_2m
[NR_INFO
];
78 extern u16 __read_mostly tlb_lld_4m
[NR_INFO
];
79 extern u16 __read_mostly tlb_lld_1g
[NR_INFO
];
82 * CPU type and hardware bug flags. Kept separately for each CPU.
83 * Members of this structure are referenced in head_32.S, so think twice
84 * before touching them. [mj]
88 __u8 x86
; /* CPU family */
89 __u8 x86_vendor
; /* CPU vendor */
93 /* Number of 4K pages in DTLB/ITLB combined(in pages): */
98 /* CPUID returned core id bits: */
101 /* Max extended CPUID function supported: */
102 __u32 extended_cpuid_level
;
103 /* Maximum supported CPUID level, -1=no CPUID: */
105 __u32 x86_capability
[NCAPINTS
+ NBUGINTS
];
106 char x86_vendor_id
[16];
107 char x86_model_id
[64];
108 /* in KB - valid for CPUS which support this call: */
110 int x86_cache_alignment
; /* In bytes */
111 /* Cache QoS architectural values: */
112 int x86_cache_max_rmid
; /* max index */
113 int x86_cache_occ_scale
; /* scale to bytes */
115 unsigned long loops_per_jiffy
;
116 /* cpuid returned max cores value: */
120 u16 x86_clflush_size
;
121 /* number of cores as seen by the OS: */
123 /* Physical processor id: */
125 /* Logical processor id: */
129 /* Index into per_cpu list: */
132 } __randomize_layout
;
135 u32 eax
, ebx
, ecx
, edx
;
138 enum cpuid_regs_idx
{
145 #define X86_VENDOR_INTEL 0
146 #define X86_VENDOR_CYRIX 1
147 #define X86_VENDOR_AMD 2
148 #define X86_VENDOR_UMC 3
149 #define X86_VENDOR_CENTAUR 5
150 #define X86_VENDOR_TRANSMETA 7
151 #define X86_VENDOR_NSC 8
152 #define X86_VENDOR_NUM 9
154 #define X86_VENDOR_UNKNOWN 0xff
157 * capabilities of CPUs
159 extern struct cpuinfo_x86 boot_cpu_data
;
160 extern struct cpuinfo_x86 new_cpu_data
;
162 #include <linux/thread_info.h>
164 extern struct tss_struct doublefault_tss
;
165 extern __u32 cpu_caps_cleared
[NCAPINTS
];
166 extern __u32 cpu_caps_set
[NCAPINTS
];
169 DECLARE_PER_CPU_READ_MOSTLY(struct cpuinfo_x86
, cpu_info
);
170 #define cpu_data(cpu) per_cpu(cpu_info, cpu)
172 #define cpu_info boot_cpu_data
173 #define cpu_data(cpu) boot_cpu_data
176 extern const struct seq_operations cpuinfo_op
;
178 #define cache_line_size() (boot_cpu_data.x86_cache_alignment)
180 extern void cpu_detect(struct cpuinfo_x86
*c
);
182 extern void early_cpu_init(void);
183 extern void identify_boot_cpu(void);
184 extern void identify_secondary_cpu(struct cpuinfo_x86
*);
185 extern void print_cpu_info(struct cpuinfo_x86
*);
186 void print_cpu_msr(struct cpuinfo_x86
*);
187 extern void init_scattered_cpuid_features(struct cpuinfo_x86
*c
);
188 extern u32
get_scattered_cpuid_leaf(unsigned int level
,
189 unsigned int sub_leaf
,
190 enum cpuid_regs_idx reg
);
191 extern unsigned int init_intel_cacheinfo(struct cpuinfo_x86
*c
);
192 extern void init_amd_cacheinfo(struct cpuinfo_x86
*c
);
194 extern void detect_extended_topology(struct cpuinfo_x86
*c
);
195 extern void detect_ht(struct cpuinfo_x86
*c
);
198 extern int have_cpuid_p(void);
200 static inline int have_cpuid_p(void)
205 static inline void native_cpuid(unsigned int *eax
, unsigned int *ebx
,
206 unsigned int *ecx
, unsigned int *edx
)
208 /* ecx is often an input as well as an output. */
214 : "0" (*eax
), "2" (*ecx
)
218 #define native_cpuid_reg(reg) \
219 static inline unsigned int native_cpuid_##reg(unsigned int op) \
221 unsigned int eax = op, ebx, ecx = 0, edx; \
223 native_cpuid(&eax, &ebx, &ecx, &edx); \
229 * Native CPUID functions returning a single datum.
231 native_cpuid_reg(eax
)
232 native_cpuid_reg(ebx
)
233 native_cpuid_reg(ecx
)
234 native_cpuid_reg(edx
)
237 * Friendlier CR3 helpers.
239 static inline unsigned long read_cr3_pa(void)
241 return __read_cr3() & CR3_ADDR_MASK
;
244 static inline void load_cr3(pgd_t
*pgdir
)
246 write_cr3(__pa(pgdir
));
250 /* This is the TSS defined by the hardware. */
252 unsigned short back_link
, __blh
;
254 unsigned short ss0
, __ss0h
;
258 * We don't use ring 1, so ss1 is a convenient scratch space in
259 * the same cacheline as sp0. We use ss1 to cache the value in
260 * MSR_IA32_SYSENTER_CS. When we context switch
261 * MSR_IA32_SYSENTER_CS, we first check if the new value being
262 * written matches ss1, and, if it's not, then we wrmsr the new
263 * value and update ss1.
265 * The only reason we context switch MSR_IA32_SYSENTER_CS is
266 * that we set it to zero in vm86 tasks to avoid corrupting the
267 * stack if we were to go through the sysenter path from vm86
270 unsigned short ss1
; /* MSR_IA32_SYSENTER_CS */
272 unsigned short __ss1h
;
274 unsigned short ss2
, __ss2h
;
286 unsigned short es
, __esh
;
287 unsigned short cs
, __csh
;
288 unsigned short ss
, __ssh
;
289 unsigned short ds
, __dsh
;
290 unsigned short fs
, __fsh
;
291 unsigned short gs
, __gsh
;
292 unsigned short ldt
, __ldth
;
293 unsigned short trace
;
294 unsigned short io_bitmap_base
;
296 } __attribute__((packed
));
310 } __attribute__((packed
));
316 #define IO_BITMAP_BITS 65536
317 #define IO_BITMAP_BYTES (IO_BITMAP_BITS/8)
318 #define IO_BITMAP_LONGS (IO_BITMAP_BYTES/sizeof(long))
319 #define IO_BITMAP_OFFSET offsetof(struct tss_struct, io_bitmap)
320 #define INVALID_IO_BITMAP_OFFSET 0x8000
324 * The hardware state:
326 struct x86_hw_tss x86_tss
;
329 * The extra 1 is there because the CPU will access an
330 * additional byte beyond the end of the IO permission
331 * bitmap. The extra byte must be all 1 bits, and must
332 * be within the limit.
334 unsigned long io_bitmap
[IO_BITMAP_LONGS
+ 1];
337 * Space for the temporary SYSENTER stack.
339 unsigned long SYSENTER_stack_canary
;
340 unsigned long SYSENTER_stack
[64];
341 } ____cacheline_aligned
;
343 DECLARE_PER_CPU_SHARED_ALIGNED(struct tss_struct
, cpu_tss
);
346 * sizeof(unsigned long) coming from an extra "long" at the end
349 * -1? seg base+limit should be pointing to the address of the
352 #define __KERNEL_TSS_LIMIT \
353 (IO_BITMAP_OFFSET + IO_BITMAP_BYTES + sizeof(unsigned long) - 1)
356 DECLARE_PER_CPU(unsigned long, cpu_current_top_of_stack
);
360 * Save the original ist values for checking stack pointers during debugging
363 unsigned long ist
[7];
367 DECLARE_PER_CPU(struct orig_ist
, orig_ist
);
369 union irq_stack_union
{
370 char irq_stack
[IRQ_STACK_SIZE
];
372 * GCC hardcodes the stack canary as %gs:40. Since the
373 * irq_stack is the object at %gs:0, we reserve the bottom
374 * 48 bytes of the irq stack for the canary.
378 unsigned long stack_canary
;
382 DECLARE_PER_CPU_FIRST(union irq_stack_union
, irq_stack_union
) __visible
;
383 DECLARE_INIT_PER_CPU(irq_stack_union
);
385 DECLARE_PER_CPU(char *, irq_stack_ptr
);
386 DECLARE_PER_CPU(unsigned int, irq_count
);
387 extern asmlinkage
void ignore_sysret(void);
389 #ifdef CONFIG_CC_STACKPROTECTOR
391 * Make sure stack canary segment base is cached-aligned:
392 * "For Intel Atom processors, avoid non zero segment base address
393 * that is not aligned to cache line boundary at all cost."
394 * (Optim Ref Manual Assembly/Compiler Coding Rule 15.)
396 struct stack_canary
{
397 char __pad
[20]; /* canary at %gs:20 */
398 unsigned long canary
;
400 DECLARE_PER_CPU_ALIGNED(struct stack_canary
, stack_canary
);
403 * per-CPU IRQ handling stacks
406 u32 stack
[THREAD_SIZE
/sizeof(u32
)];
407 } __aligned(THREAD_SIZE
);
409 DECLARE_PER_CPU(struct irq_stack
*, hardirq_stack
);
410 DECLARE_PER_CPU(struct irq_stack
*, softirq_stack
);
413 extern unsigned int fpu_kernel_xstate_size
;
414 extern unsigned int fpu_user_xstate_size
;
422 struct thread_struct
{
423 /* Cached TLS descriptors: */
424 struct desc_struct tls_array
[GDT_ENTRY_TLS_ENTRIES
];
430 unsigned long sysenter_cs
;
434 unsigned short fsindex
;
435 unsigned short gsindex
;
438 u32 status
; /* thread synchronous flags */
441 unsigned long fsbase
;
442 unsigned long gsbase
;
445 * XXX: this could presumably be unsigned short. Alternatively,
446 * 32-bit kernels could be taught to use fsindex instead.
452 /* Save middle states of ptrace breakpoints */
453 struct perf_event
*ptrace_bps
[HBP_NUM
];
454 /* Debug status used for traps, single steps, etc... */
455 unsigned long debugreg6
;
456 /* Keep track of the exact dr7 value set by the user */
457 unsigned long ptrace_dr7
;
460 unsigned long trap_nr
;
461 unsigned long error_code
;
463 /* Virtual 86 mode info */
466 /* IO permissions: */
467 unsigned long *io_bitmap_ptr
;
469 /* Max allowed port in the bitmap, in bytes: */
470 unsigned io_bitmap_max
;
472 mm_segment_t addr_limit
;
474 unsigned int sig_on_uaccess_err
:1;
475 unsigned int uaccess_err
:1; /* uaccess failed */
477 /* Floating point and extended processor state */
480 * WARNING: 'fpu' is dynamically-sized. It *MUST* be at
486 * Thread-synchronous status.
488 * This is different from the flags in that nobody else
489 * ever touches our thread-synchronous status, so we don't
490 * have to worry about atomic accesses.
492 #define TS_COMPAT 0x0002 /* 32bit syscall active (64BIT)*/
495 * Set IOPL bits in EFLAGS from given mask
497 static inline void native_set_iopl_mask(unsigned mask
)
502 asm volatile ("pushfl;"
509 : "i" (~X86_EFLAGS_IOPL
), "r" (mask
));
514 native_load_sp0(unsigned long sp0
)
516 this_cpu_write(cpu_tss
.x86_tss
.sp0
, sp0
);
519 static inline void native_swapgs(void)
522 asm volatile("swapgs" ::: "memory");
526 static inline unsigned long current_top_of_stack(void)
529 return this_cpu_read_stable(cpu_tss
.x86_tss
.sp0
);
531 /* sp0 on x86_32 is special in and around vm86 mode. */
532 return this_cpu_read_stable(cpu_current_top_of_stack
);
536 static inline bool on_thread_stack(void)
538 return (unsigned long)(current_top_of_stack() -
539 current_stack_pointer()) < THREAD_SIZE
;
542 #ifdef CONFIG_PARAVIRT
543 #include <asm/paravirt.h>
545 #define __cpuid native_cpuid
547 static inline void load_sp0(unsigned long sp0
)
549 native_load_sp0(sp0
);
552 #define set_iopl_mask native_set_iopl_mask
553 #endif /* CONFIG_PARAVIRT */
555 /* Free all resources held by a thread. */
556 extern void release_thread(struct task_struct
*);
558 unsigned long get_wchan(struct task_struct
*p
);
561 * Generic CPUID function
562 * clear %ecx since some cpus (Cyrix MII) do not set or clear %ecx
563 * resulting in stale register contents being returned.
565 static inline void cpuid(unsigned int op
,
566 unsigned int *eax
, unsigned int *ebx
,
567 unsigned int *ecx
, unsigned int *edx
)
571 __cpuid(eax
, ebx
, ecx
, edx
);
574 /* Some CPUID calls want 'count' to be placed in ecx */
575 static inline void cpuid_count(unsigned int op
, int count
,
576 unsigned int *eax
, unsigned int *ebx
,
577 unsigned int *ecx
, unsigned int *edx
)
581 __cpuid(eax
, ebx
, ecx
, edx
);
585 * CPUID functions returning a single datum
587 static inline unsigned int cpuid_eax(unsigned int op
)
589 unsigned int eax
, ebx
, ecx
, edx
;
591 cpuid(op
, &eax
, &ebx
, &ecx
, &edx
);
596 static inline unsigned int cpuid_ebx(unsigned int op
)
598 unsigned int eax
, ebx
, ecx
, edx
;
600 cpuid(op
, &eax
, &ebx
, &ecx
, &edx
);
605 static inline unsigned int cpuid_ecx(unsigned int op
)
607 unsigned int eax
, ebx
, ecx
, edx
;
609 cpuid(op
, &eax
, &ebx
, &ecx
, &edx
);
614 static inline unsigned int cpuid_edx(unsigned int op
)
616 unsigned int eax
, ebx
, ecx
, edx
;
618 cpuid(op
, &eax
, &ebx
, &ecx
, &edx
);
623 /* REP NOP (PAUSE) is a good thing to insert into busy-wait loops. */
624 static __always_inline
void rep_nop(void)
626 asm volatile("rep; nop" ::: "memory");
629 static __always_inline
void cpu_relax(void)
635 * This function forces the icache and prefetched instruction stream to
636 * catch up with reality in two very specific cases:
638 * a) Text was modified using one virtual address and is about to be executed
639 * from the same physical page at a different virtual address.
641 * b) Text was modified on a different CPU, may subsequently be
642 * executed on this CPU, and you want to make sure the new version
643 * gets executed. This generally means you're calling this in a IPI.
645 * If you're calling this for a different reason, you're probably doing
648 static inline void sync_core(void)
651 * There are quite a few ways to do this. IRET-to-self is nice
652 * because it works on every CPU, at any CPL (so it's compatible
653 * with paravirtualization), and it never exits to a hypervisor.
654 * The only down sides are that it's a bit slow (it seems to be
655 * a bit more than 2x slower than the fastest options) and that
656 * it unmasks NMIs. The "push %cs" is needed because, in
657 * paravirtual environments, __KERNEL_CS may not be a valid CS
658 * value when we do IRET directly.
660 * In case NMI unmasking or performance ever becomes a problem,
661 * the next best option appears to be MOV-to-CR2 and an
662 * unconditional jump. That sequence also works on all CPUs,
663 * but it will fault at CPL3 (i.e. Xen PV and lguest).
665 * CPUID is the conventional way, but it's nasty: it doesn't
666 * exist on some 486-like CPUs, and it usually exits to a
669 * Like all of Linux's memory ordering operations, this is a
670 * compiler barrier as well.
672 register void *__sp
asm(_ASM_SP
);
681 : "+r" (__sp
) : : "memory");
689 "addq $8, (%%rsp)\n\t"
696 : "=&r" (tmp
), "+r" (__sp
) : : "cc", "memory");
700 extern void select_idle_routine(const struct cpuinfo_x86
*c
);
701 extern void amd_e400_c1e_apic_setup(void);
703 extern unsigned long boot_option_idle_override
;
705 enum idle_boot_override
{IDLE_NO_OVERRIDE
=0, IDLE_HALT
, IDLE_NOMWAIT
,
708 extern void enable_sep_cpu(void);
709 extern int sysenter_setup(void);
711 extern void early_trap_init(void);
712 void early_trap_pf_init(void);
714 /* Defined in head.S */
715 extern struct desc_ptr early_gdt_descr
;
717 extern void cpu_set_gdt(int);
718 extern void switch_to_new_gdt(int);
719 extern void load_direct_gdt(int);
720 extern void load_fixmap_gdt(int);
721 extern void load_percpu_segment(int);
722 extern void cpu_init(void);
724 static inline unsigned long get_debugctlmsr(void)
726 unsigned long debugctlmsr
= 0;
728 #ifndef CONFIG_X86_DEBUGCTLMSR
729 if (boot_cpu_data
.x86
< 6)
732 rdmsrl(MSR_IA32_DEBUGCTLMSR
, debugctlmsr
);
737 static inline void update_debugctlmsr(unsigned long debugctlmsr
)
739 #ifndef CONFIG_X86_DEBUGCTLMSR
740 if (boot_cpu_data
.x86
< 6)
743 wrmsrl(MSR_IA32_DEBUGCTLMSR
, debugctlmsr
);
746 extern void set_task_blockstep(struct task_struct
*task
, bool on
);
748 /* Boot loader type from the setup header: */
749 extern int bootloader_type
;
750 extern int bootloader_version
;
752 extern char ignore_fpu_irq
;
754 #define HAVE_ARCH_PICK_MMAP_LAYOUT 1
755 #define ARCH_HAS_PREFETCHW
756 #define ARCH_HAS_SPINLOCK_PREFETCH
759 # define BASE_PREFETCH ""
760 # define ARCH_HAS_PREFETCH
762 # define BASE_PREFETCH "prefetcht0 %P1"
766 * Prefetch instructions for Pentium III (+) and AMD Athlon (+)
768 * It's not worth to care about 3dnow prefetches for the K6
769 * because they are microcoded there and very slow.
771 static inline void prefetch(const void *x
)
773 alternative_input(BASE_PREFETCH
, "prefetchnta %P1",
775 "m" (*(const char *)x
));
779 * 3dnow prefetch to get an exclusive cache line.
780 * Useful for spinlocks to avoid one state transition in the
781 * cache coherency protocol:
783 static inline void prefetchw(const void *x
)
785 alternative_input(BASE_PREFETCH
, "prefetchw %P1",
786 X86_FEATURE_3DNOWPREFETCH
,
787 "m" (*(const char *)x
));
790 static inline void spin_lock_prefetch(const void *x
)
795 #define TOP_OF_INIT_STACK ((unsigned long)&init_stack + sizeof(init_stack) - \
796 TOP_OF_KERNEL_STACK_PADDING)
798 #define task_top_of_stack(task) ((unsigned long)(task_pt_regs(task) + 1))
800 #define task_pt_regs(task) \
802 unsigned long __ptr = (unsigned long)task_stack_page(task); \
803 __ptr += THREAD_SIZE - TOP_OF_KERNEL_STACK_PADDING; \
804 ((struct pt_regs *)__ptr) - 1; \
809 * User space process size: 3GB (default).
811 #define IA32_PAGE_OFFSET PAGE_OFFSET
812 #define TASK_SIZE PAGE_OFFSET
813 #define TASK_SIZE_MAX TASK_SIZE
814 #define STACK_TOP TASK_SIZE
815 #define STACK_TOP_MAX STACK_TOP
817 #define INIT_THREAD { \
818 .sp0 = TOP_OF_INIT_STACK, \
819 .sysenter_cs = __KERNEL_CS, \
820 .io_bitmap_ptr = NULL, \
821 .addr_limit = KERNEL_DS, \
824 #define KSTK_ESP(task) (task_pt_regs(task)->sp)
828 * User space process size. 47bits minus one guard page. The guard
829 * page is necessary on Intel CPUs: if a SYSCALL instruction is at
830 * the highest possible canonical userspace address, then that
831 * syscall will enter the kernel with a non-canonical return
832 * address, and SYSRET will explode dangerously. We avoid this
833 * particular problem by preventing anything from being mapped
834 * at the maximum canonical address.
836 #define TASK_SIZE_MAX ((1UL << 47) - PAGE_SIZE)
838 /* This decides where the kernel will search for a free chunk of vm
839 * space during mmap's.
841 #define IA32_PAGE_OFFSET ((current->personality & ADDR_LIMIT_3GB) ? \
842 0xc0000000 : 0xFFFFe000)
844 #define TASK_SIZE (test_thread_flag(TIF_ADDR32) ? \
845 IA32_PAGE_OFFSET : TASK_SIZE_MAX)
846 #define TASK_SIZE_OF(child) ((test_tsk_thread_flag(child, TIF_ADDR32)) ? \
847 IA32_PAGE_OFFSET : TASK_SIZE_MAX)
849 #define STACK_TOP TASK_SIZE
850 #define STACK_TOP_MAX TASK_SIZE_MAX
852 #define INIT_THREAD { \
853 .addr_limit = KERNEL_DS, \
856 extern unsigned long KSTK_ESP(struct task_struct
*task
);
858 #endif /* CONFIG_X86_64 */
860 extern void start_thread(struct pt_regs
*regs
, unsigned long new_ip
,
861 unsigned long new_sp
);
864 * This decides where the kernel will search for a free chunk of vm
865 * space during mmap's.
867 #define __TASK_UNMAPPED_BASE(task_size) (PAGE_ALIGN(task_size / 3))
868 #define TASK_UNMAPPED_BASE __TASK_UNMAPPED_BASE(TASK_SIZE)
870 #define KSTK_EIP(task) (task_pt_regs(task)->ip)
872 /* Get/set a process' ability to use the timestamp counter instruction */
873 #define GET_TSC_CTL(adr) get_tsc_mode((adr))
874 #define SET_TSC_CTL(val) set_tsc_mode((val))
876 extern int get_tsc_mode(unsigned long adr
);
877 extern int set_tsc_mode(unsigned int val
);
879 DECLARE_PER_CPU(u64
, msr_misc_features_shadow
);
881 /* Register/unregister a process' MPX related resource */
882 #define MPX_ENABLE_MANAGEMENT() mpx_enable_management()
883 #define MPX_DISABLE_MANAGEMENT() mpx_disable_management()
885 #ifdef CONFIG_X86_INTEL_MPX
886 extern int mpx_enable_management(void);
887 extern int mpx_disable_management(void);
889 static inline int mpx_enable_management(void)
893 static inline int mpx_disable_management(void)
897 #endif /* CONFIG_X86_INTEL_MPX */
899 #ifdef CONFIG_CPU_SUP_AMD
900 extern u16
amd_get_nb_id(int cpu
);
901 extern u32
amd_get_nodes_per_socket(void);
903 static inline u16
amd_get_nb_id(int cpu
) { return 0; }
904 static inline u32
amd_get_nodes_per_socket(void) { return 0; }
907 static inline uint32_t hypervisor_cpuid_base(const char *sig
, uint32_t leaves
)
909 uint32_t base
, eax
, signature
[3];
911 for (base
= 0x40000000; base
< 0x40010000; base
+= 0x100) {
912 cpuid(base
, &eax
, &signature
[0], &signature
[1], &signature
[2]);
914 if (!memcmp(sig
, signature
, 12) &&
915 (leaves
== 0 || ((eax
- base
) >= leaves
)))
922 extern unsigned long arch_align_stack(unsigned long sp
);
923 extern void free_init_pages(char *what
, unsigned long begin
, unsigned long end
);
925 void default_idle(void);
927 bool xen_set_default_idle(void);
929 #define xen_set_default_idle 0
932 void stop_this_cpu(void *dummy
);
933 void df_debug(struct pt_regs
*regs
, long error_code
);
934 #endif /* _ASM_X86_PROCESSOR_H */