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 <asm/sigcontext.h>
15 #include <asm/current.h>
16 #include <asm/cpufeature.h>
17 #include <asm/system.h>
19 #include <asm/pgtable_types.h>
20 #include <asm/percpu.h>
22 #include <asm/desc_defs.h>
26 #include <linux/personality.h>
27 #include <linux/cpumask.h>
28 #include <linux/cache.h>
29 #include <linux/threads.h>
30 #include <linux/init.h>
33 * Default implementation of macro that returns current
34 * instruction pointer ("program counter").
36 static inline void *current_text_addr(void)
40 asm volatile("mov $1f, %0; 1:":"=r" (pc));
45 #ifdef CONFIG_X86_VSMP
46 # define ARCH_MIN_TASKALIGN (1 << INTERNODE_CACHE_SHIFT)
47 # define ARCH_MIN_MMSTRUCT_ALIGN (1 << INTERNODE_CACHE_SHIFT)
49 # define ARCH_MIN_TASKALIGN 16
50 # define ARCH_MIN_MMSTRUCT_ALIGN 0
54 * CPU type and hardware bug flags. Kept separately for each CPU.
55 * Members of this structure are referenced in head.S, so think twice
56 * before touching them. [mj]
60 __u8 x86; /* CPU family */
61 __u8 x86_vendor; /* CPU vendor */
65 char wp_works_ok; /* It doesn't on 386's */
67 /* Problems on some 486Dx4's and old 386's: */
76 /* Number of 4K pages in DTLB/ITLB combined(in pages): */
81 /* CPUID returned core id bits: */
83 /* Max extended CPUID function supported: */
84 __u32 extended_cpuid_level;
85 /* Maximum supported CPUID level, -1=no CPUID: */
87 __u32 x86_capability[NCAPINTS];
88 char x86_vendor_id[16];
89 char x86_model_id[64];
90 /* in KB - valid for CPUS which support this call: */
92 int x86_cache_alignment; /* In bytes */
94 unsigned long loops_per_jiffy;
96 /* cpus sharing the last level cache: */
97 cpumask_var_t llc_shared_map;
99 /* cpuid returned max cores value: */
103 u16 x86_clflush_size;
105 /* number of cores as seen by the OS: */
107 /* Physical processor id: */
111 /* Index into per_cpu list: */
114 unsigned int x86_hyper_vendor;
115 } __attribute__((__aligned__(SMP_CACHE_BYTES)));
117 #define X86_VENDOR_INTEL 0
118 #define X86_VENDOR_CYRIX 1
119 #define X86_VENDOR_AMD 2
120 #define X86_VENDOR_UMC 3
121 #define X86_VENDOR_CENTAUR 5
122 #define X86_VENDOR_TRANSMETA 7
123 #define X86_VENDOR_NSC 8
124 #define X86_VENDOR_NUM 9
126 #define X86_VENDOR_UNKNOWN 0xff
128 #define X86_HYPER_VENDOR_NONE 0
129 #define X86_HYPER_VENDOR_VMWARE 1
132 * capabilities of CPUs
134 extern struct cpuinfo_x86 boot_cpu_data;
135 extern struct cpuinfo_x86 new_cpu_data;
137 extern struct tss_struct doublefault_tss;
138 extern __u32 cleared_cpu_caps[NCAPINTS];
141 DECLARE_PER_CPU(struct cpuinfo_x86, cpu_info);
142 #define cpu_data(cpu) per_cpu(cpu_info, cpu)
143 #define current_cpu_data __get_cpu_var(cpu_info)
145 #define cpu_data(cpu) boot_cpu_data
146 #define current_cpu_data boot_cpu_data
149 extern const struct seq_operations cpuinfo_op;
151 static inline int hlt_works(int cpu)
154 return cpu_data(cpu).hlt_works_ok;
160 #define cache_line_size() (boot_cpu_data.x86_cache_alignment)
162 extern void cpu_detect(struct cpuinfo_x86 *c);
164 extern struct pt_regs *idle_regs(struct pt_regs *);
166 extern void early_cpu_init(void);
167 extern void identify_boot_cpu(void);
168 extern void identify_secondary_cpu(struct cpuinfo_x86 *);
169 extern void print_cpu_info(struct cpuinfo_x86 *);
170 extern void init_scattered_cpuid_features(struct cpuinfo_x86 *c);
171 extern unsigned int init_intel_cacheinfo(struct cpuinfo_x86 *c);
172 extern unsigned short num_cache_leaves;
174 extern void detect_extended_topology(struct cpuinfo_x86 *c);
175 extern void detect_ht(struct cpuinfo_x86 *c);
177 static inline void native_cpuid(unsigned int *eax, unsigned int *ebx,
178 unsigned int *ecx, unsigned int *edx)
180 /* ecx is often an input as well as an output. */
186 : "0" (*eax), "2" (*ecx));
189 static inline void load_cr3(pgd_t *pgdir)
191 write_cr3(__pa(pgdir));
195 /* This is the TSS defined by the hardware. */
197 unsigned short back_link, __blh;
199 unsigned short ss0, __ss0h;
201 /* ss1 caches MSR_IA32_SYSENTER_CS: */
202 unsigned short ss1, __ss1h;
204 unsigned short ss2, __ss2h;
216 unsigned short es, __esh;
217 unsigned short cs, __csh;
218 unsigned short ss, __ssh;
219 unsigned short ds, __dsh;
220 unsigned short fs, __fsh;
221 unsigned short gs, __gsh;
222 unsigned short ldt, __ldth;
223 unsigned short trace;
224 unsigned short io_bitmap_base;
226 } __attribute__((packed));
240 } __attribute__((packed)) ____cacheline_aligned;
246 #define IO_BITMAP_BITS 65536
247 #define IO_BITMAP_BYTES (IO_BITMAP_BITS/8)
248 #define IO_BITMAP_LONGS (IO_BITMAP_BYTES/sizeof(long))
249 #define IO_BITMAP_OFFSET offsetof(struct tss_struct, io_bitmap)
250 #define INVALID_IO_BITMAP_OFFSET 0x8000
254 * The hardware state:
256 struct x86_hw_tss x86_tss;
259 * The extra 1 is there because the CPU will access an
260 * additional byte beyond the end of the IO permission
261 * bitmap. The extra byte must be all 1 bits, and must
262 * be within the limit.
264 unsigned long io_bitmap[IO_BITMAP_LONGS + 1];
267 * .. and then another 0x100 bytes for the emergency kernel stack:
269 unsigned long stack[64];
271 } ____cacheline_aligned;
273 DECLARE_PER_CPU(struct tss_struct, init_tss);
276 * Save the original ist values for checking stack pointers during debugging
279 unsigned long ist[7];
282 #define MXCSR_DEFAULT 0x1f80
284 struct i387_fsave_struct {
285 u32 cwd; /* FPU Control Word */
286 u32 swd; /* FPU Status Word */
287 u32 twd; /* FPU Tag Word */
288 u32 fip; /* FPU IP Offset */
289 u32 fcs; /* FPU IP Selector */
290 u32 foo; /* FPU Operand Pointer Offset */
291 u32 fos; /* FPU Operand Pointer Selector */
293 /* 8*10 bytes for each FP-reg = 80 bytes: */
296 /* Software status information [not touched by FSAVE ]: */
300 struct i387_fxsave_struct {
301 u16 cwd; /* Control Word */
302 u16 swd; /* Status Word */
303 u16 twd; /* Tag Word */
304 u16 fop; /* Last Instruction Opcode */
307 u64 rip; /* Instruction Pointer */
308 u64 rdp; /* Data Pointer */
311 u32 fip; /* FPU IP Offset */
312 u32 fcs; /* FPU IP Selector */
313 u32 foo; /* FPU Operand Offset */
314 u32 fos; /* FPU Operand Selector */
317 u32 mxcsr; /* MXCSR Register State */
318 u32 mxcsr_mask; /* MXCSR Mask */
320 /* 8*16 bytes for each FP-reg = 128 bytes: */
323 /* 16*16 bytes for each XMM-reg = 256 bytes: */
333 } __attribute__((aligned(16)));
335 struct i387_soft_struct {
343 /* 8*10 bytes for each FP-reg = 80 bytes: */
351 struct math_emu_info *info;
356 /* 16 * 16 bytes for each YMMH-reg = 256 bytes */
360 struct xsave_hdr_struct {
364 } __attribute__((packed));
366 struct xsave_struct {
367 struct i387_fxsave_struct i387;
368 struct xsave_hdr_struct xsave_hdr;
369 struct ymmh_struct ymmh;
370 /* new processor state extensions will go here */
371 } __attribute__ ((packed, aligned (64)));
373 union thread_xstate {
374 struct i387_fsave_struct fsave;
375 struct i387_fxsave_struct fxsave;
376 struct i387_soft_struct soft;
377 struct xsave_struct xsave;
381 DECLARE_PER_CPU(struct orig_ist, orig_ist);
383 union irq_stack_union {
384 char irq_stack[IRQ_STACK_SIZE];
386 * GCC hardcodes the stack canary as %gs:40. Since the
387 * irq_stack is the object at %gs:0, we reserve the bottom
388 * 48 bytes of the irq stack for the canary.
392 unsigned long stack_canary;
396 DECLARE_PER_CPU(union irq_stack_union, irq_stack_union);
397 DECLARE_INIT_PER_CPU(irq_stack_union);
399 DECLARE_PER_CPU(char *, irq_stack_ptr);
400 DECLARE_PER_CPU(unsigned int, irq_count);
401 extern unsigned long kernel_eflags;
402 extern asmlinkage void ignore_sysret(void);
404 #ifdef CONFIG_CC_STACKPROTECTOR
405 DECLARE_PER_CPU(unsigned long, stack_canary);
409 extern unsigned int xstate_size;
410 extern void free_thread_xstate(struct task_struct *);
411 extern struct kmem_cache *task_xstate_cachep;
412 extern void init_scattered_cpuid_features(struct cpuinfo_x86 *c);
413 extern unsigned int init_intel_cacheinfo(struct cpuinfo_x86 *c);
414 extern unsigned short num_cache_leaves;
416 struct thread_struct {
417 /* Cached TLS descriptors: */
418 struct desc_struct tls_array[GDT_ENTRY_TLS_ENTRIES];
422 unsigned long sysenter_cs;
424 unsigned long usersp; /* Copy from PDA */
427 unsigned short fsindex;
428 unsigned short gsindex;
433 /* Hardware debugging registers: */
434 unsigned long debugreg0;
435 unsigned long debugreg1;
436 unsigned long debugreg2;
437 unsigned long debugreg3;
438 unsigned long debugreg6;
439 unsigned long debugreg7;
442 unsigned long trap_no;
443 unsigned long error_code;
444 /* floating point and extended processor state */
445 union thread_xstate *xstate;
447 /* Virtual 86 mode info */
448 struct vm86_struct __user *vm86_info;
449 unsigned long screen_bitmap;
450 unsigned long v86flags;
451 unsigned long v86mask;
452 unsigned long saved_sp0;
453 unsigned int saved_fs;
454 unsigned int saved_gs;
456 /* IO permissions: */
457 unsigned long *io_bitmap_ptr;
459 /* Max allowed port in the bitmap, in bytes: */
460 unsigned io_bitmap_max;
461 /* MSR_IA32_DEBUGCTLMSR value to switch in if TIF_DEBUGCTLMSR is set. */
462 unsigned long debugctlmsr;
464 /* Debug Store context; see include/asm-x86/ds.h; goes into MSR_IA32_DS_AREA */
465 struct ds_context *ds_ctx;
466 #endif /* CONFIG_X86_DS */
467 #ifdef CONFIG_X86_PTRACE_BTS
468 /* the signal to send on a bts buffer overflow */
469 unsigned int bts_ovfl_signal;
470 #endif /* CONFIG_X86_PTRACE_BTS */
473 static inline unsigned long native_get_debugreg(int regno)
475 unsigned long val = 0; /* Damn you, gcc! */
479 asm("mov %%db0, %0" :"=r" (val));
482 asm("mov %%db1, %0" :"=r" (val));
485 asm("mov %%db2, %0" :"=r" (val));
488 asm("mov %%db3, %0" :"=r" (val));
491 asm("mov %%db6, %0" :"=r" (val));
494 asm("mov %%db7, %0" :"=r" (val));
502 static inline void native_set_debugreg(int regno, unsigned long value)
506 asm("mov %0, %%db0" ::"r" (value));
509 asm("mov %0, %%db1" ::"r" (value));
512 asm("mov %0, %%db2" ::"r" (value));
515 asm("mov %0, %%db3" ::"r" (value));
518 asm("mov %0, %%db6" ::"r" (value));
521 asm("mov %0, %%db7" ::"r" (value));
529 * Set IOPL bits in EFLAGS from given mask
531 static inline void native_set_iopl_mask(unsigned mask)
536 asm volatile ("pushfl;"
543 : "i" (~X86_EFLAGS_IOPL), "r" (mask));
548 native_load_sp0(struct tss_struct *tss, struct thread_struct *thread)
550 tss->x86_tss.sp0 = thread->sp0;
552 /* Only happens when SEP is enabled, no need to test "SEP"arately: */
553 if (unlikely(tss->x86_tss.ss1 != thread->sysenter_cs)) {
554 tss->x86_tss.ss1 = thread->sysenter_cs;
555 wrmsr(MSR_IA32_SYSENTER_CS, thread->sysenter_cs, 0);
560 static inline void native_swapgs(void)
563 asm volatile("swapgs" ::: "memory");
567 #ifdef CONFIG_PARAVIRT
568 #include <asm/paravirt.h>
570 #define __cpuid native_cpuid
571 #define paravirt_enabled() 0
574 * These special macros can be used to get or set a debugging register
576 #define get_debugreg(var, register) \
577 (var) = native_get_debugreg(register)
578 #define set_debugreg(value, register) \
579 native_set_debugreg(register, value)
581 static inline void load_sp0(struct tss_struct *tss,
582 struct thread_struct *thread)
584 native_load_sp0(tss, thread);
587 #define set_iopl_mask native_set_iopl_mask
588 #endif /* CONFIG_PARAVIRT */
591 * Save the cr4 feature set we're using (ie
592 * Pentium 4MB enable and PPro Global page
593 * enable), so that any CPU's that boot up
594 * after us can get the correct flags.
596 extern unsigned long mmu_cr4_features;
598 static inline void set_in_cr4(unsigned long mask)
602 mmu_cr4_features |= mask;
608 static inline void clear_in_cr4(unsigned long mask)
612 mmu_cr4_features &= ~mask;
624 * create a kernel thread without removing it from tasklists
626 extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
628 /* Free all resources held by a thread. */
629 extern void release_thread(struct task_struct *);
631 /* Prepare to copy thread state - unlazy all lazy state */
632 extern void prepare_to_copy(struct task_struct *tsk);
634 unsigned long get_wchan(struct task_struct *p);
637 * Generic CPUID function
638 * clear %ecx since some cpus (Cyrix MII) do not set or clear %ecx
639 * resulting in stale register contents being returned.
641 static inline void cpuid(unsigned int op,
642 unsigned int *eax, unsigned int *ebx,
643 unsigned int *ecx, unsigned int *edx)
647 __cpuid(eax, ebx, ecx, edx);
650 /* Some CPUID calls want 'count' to be placed in ecx */
651 static inline void cpuid_count(unsigned int op, int count,
652 unsigned int *eax, unsigned int *ebx,
653 unsigned int *ecx, unsigned int *edx)
657 __cpuid(eax, ebx, ecx, edx);
661 * CPUID functions returning a single datum
663 static inline unsigned int cpuid_eax(unsigned int op)
665 unsigned int eax, ebx, ecx, edx;
667 cpuid(op, &eax, &ebx, &ecx, &edx);
672 static inline unsigned int cpuid_ebx(unsigned int op)
674 unsigned int eax, ebx, ecx, edx;
676 cpuid(op, &eax, &ebx, &ecx, &edx);
681 static inline unsigned int cpuid_ecx(unsigned int op)
683 unsigned int eax, ebx, ecx, edx;
685 cpuid(op, &eax, &ebx, &ecx, &edx);
690 static inline unsigned int cpuid_edx(unsigned int op)
692 unsigned int eax, ebx, ecx, edx;
694 cpuid(op, &eax, &ebx, &ecx, &edx);
699 /* REP NOP (PAUSE) is a good thing to insert into busy-wait loops. */
700 static inline void rep_nop(void)
702 asm volatile("rep; nop" ::: "memory");
705 static inline void cpu_relax(void)
710 /* Stop speculative execution: */
711 static inline void sync_core(void)
715 asm volatile("cpuid" : "=a" (tmp) : "0" (1)
716 : "ebx", "ecx", "edx", "memory");
719 static inline void __monitor(const void *eax, unsigned long ecx,
722 /* "monitor %eax, %ecx, %edx;" */
723 asm volatile(".byte 0x0f, 0x01, 0xc8;"
724 :: "a" (eax), "c" (ecx), "d"(edx));
727 static inline void __mwait(unsigned long eax, unsigned long ecx)
729 /* "mwait %eax, %ecx;" */
730 asm volatile(".byte 0x0f, 0x01, 0xc9;"
731 :: "a" (eax), "c" (ecx));
734 static inline void __sti_mwait(unsigned long eax, unsigned long ecx)
737 /* "mwait %eax, %ecx;" */
738 asm volatile("sti; .byte 0x0f, 0x01, 0xc9;"
739 :: "a" (eax), "c" (ecx));
742 extern void mwait_idle_with_hints(unsigned long eax, unsigned long ecx);
744 extern void select_idle_routine(const struct cpuinfo_x86 *c);
745 extern void init_c1e_mask(void);
747 extern unsigned long boot_option_idle_override;
748 extern unsigned long idle_halt;
749 extern unsigned long idle_nomwait;
752 * on systems with caches, caches must be flashed as the absolute
753 * last instruction before going into a suspended halt. Otherwise,
754 * dirty data can linger in the cache and become stale on resume,
755 * leading to strange errors.
757 * perform a variety of operations to guarantee that the compiler
758 * will not reorder instructions. wbinvd itself is serializing
759 * so the processor will not reorder.
761 * Systems without cache can just go into halt.
763 static inline void wbinvd_halt(void)
766 /* check for clflush to determine if wbinvd is legal */
768 asm volatile("cli; wbinvd; 1: hlt; jmp 1b" : : : "memory");
774 extern void enable_sep_cpu(void);
775 extern int sysenter_setup(void);
777 /* Defined in head.S */
778 extern struct desc_ptr early_gdt_descr;
780 extern void cpu_set_gdt(int);
781 extern void switch_to_new_gdt(int);
782 extern void load_percpu_segment(int);
783 extern void cpu_init(void);
785 static inline unsigned long get_debugctlmsr(void)
787 unsigned long debugctlmsr = 0;
789 #ifndef CONFIG_X86_DEBUGCTLMSR
790 if (boot_cpu_data.x86 < 6)
793 rdmsrl(MSR_IA32_DEBUGCTLMSR, debugctlmsr);
798 static inline void update_debugctlmsr(unsigned long debugctlmsr)
800 #ifndef CONFIG_X86_DEBUGCTLMSR
801 if (boot_cpu_data.x86 < 6)
804 wrmsrl(MSR_IA32_DEBUGCTLMSR, debugctlmsr);
808 * from system description table in BIOS. Mostly for MCA use, but
809 * others may find it useful:
811 extern unsigned int machine_id;
812 extern unsigned int machine_submodel_id;
813 extern unsigned int BIOS_revision;
815 /* Boot loader type from the setup header: */
816 extern int bootloader_type;
818 extern char ignore_fpu_irq;
820 #define HAVE_ARCH_PICK_MMAP_LAYOUT 1
821 #define ARCH_HAS_PREFETCHW
822 #define ARCH_HAS_SPINLOCK_PREFETCH
825 # define BASE_PREFETCH ASM_NOP4
826 # define ARCH_HAS_PREFETCH
828 # define BASE_PREFETCH "prefetcht0 (%1)"
832 * Prefetch instructions for Pentium III (+) and AMD Athlon (+)
834 * It's not worth to care about 3dnow prefetches for the K6
835 * because they are microcoded there and very slow.
837 static inline void prefetch(const void *x)
839 alternative_input(BASE_PREFETCH,
846 * 3dnow prefetch to get an exclusive cache line.
847 * Useful for spinlocks to avoid one state transition in the
848 * cache coherency protocol:
850 static inline void prefetchw(const void *x)
852 alternative_input(BASE_PREFETCH,
858 static inline void spin_lock_prefetch(const void *x)
865 * User space process size: 3GB (default).
867 #define TASK_SIZE PAGE_OFFSET
868 #define TASK_SIZE_MAX TASK_SIZE
869 #define STACK_TOP TASK_SIZE
870 #define STACK_TOP_MAX STACK_TOP
872 #define INIT_THREAD { \
873 .sp0 = sizeof(init_stack) + (long)&init_stack, \
875 .sysenter_cs = __KERNEL_CS, \
876 .io_bitmap_ptr = NULL, \
877 .fs = __KERNEL_PERCPU, \
881 * Note that the .io_bitmap member must be extra-big. This is because
882 * the CPU will access an additional byte beyond the end of the IO
883 * permission bitmap. The extra byte must be all 1 bits, and must
884 * be within the limit.
888 .sp0 = sizeof(init_stack) + (long)&init_stack, \
889 .ss0 = __KERNEL_DS, \
890 .ss1 = __KERNEL_CS, \
891 .io_bitmap_base = INVALID_IO_BITMAP_OFFSET, \
893 .io_bitmap = { [0 ... IO_BITMAP_LONGS] = ~0 }, \
896 extern unsigned long thread_saved_pc(struct task_struct *tsk);
898 #define THREAD_SIZE_LONGS (THREAD_SIZE/sizeof(unsigned long))
899 #define KSTK_TOP(info) \
901 unsigned long *__ptr = (unsigned long *)(info); \
902 (unsigned long)(&__ptr[THREAD_SIZE_LONGS]); \
906 * The below -8 is to reserve 8 bytes on top of the ring0 stack.
907 * This is necessary to guarantee that the entire "struct pt_regs"
908 * is accessable even if the CPU haven't stored the SS/ESP registers
909 * on the stack (interrupt gate does not save these registers
910 * when switching to the same priv ring).
911 * Therefore beware: accessing the ss/esp fields of the
912 * "struct pt_regs" is possible, but they may contain the
913 * completely wrong values.
915 #define task_pt_regs(task) \
917 struct pt_regs *__regs__; \
918 __regs__ = (struct pt_regs *)(KSTK_TOP(task_stack_page(task))-8); \
922 #define KSTK_ESP(task) (task_pt_regs(task)->sp)
926 * User space process size. 47bits minus one guard page.
928 #define TASK_SIZE_MAX ((1UL << 47) - PAGE_SIZE)
930 /* This decides where the kernel will search for a free chunk of vm
931 * space during mmap's.
933 #define IA32_PAGE_OFFSET ((current->personality & ADDR_LIMIT_3GB) ? \
934 0xc0000000 : 0xFFFFe000)
936 #define TASK_SIZE (test_thread_flag(TIF_IA32) ? \
937 IA32_PAGE_OFFSET : TASK_SIZE_MAX)
938 #define TASK_SIZE_OF(child) ((test_tsk_thread_flag(child, TIF_IA32)) ? \
939 IA32_PAGE_OFFSET : TASK_SIZE_MAX)
941 #define STACK_TOP TASK_SIZE
942 #define STACK_TOP_MAX TASK_SIZE_MAX
944 #define INIT_THREAD { \
945 .sp0 = (unsigned long)&init_stack + sizeof(init_stack) \
949 .x86_tss.sp0 = (unsigned long)&init_stack + sizeof(init_stack) \
953 * Return saved PC of a blocked thread.
954 * What is this good for? it will be always the scheduler or ret_from_fork.
956 #define thread_saved_pc(t) (*(unsigned long *)((t)->thread.sp - 8))
958 #define task_pt_regs(tsk) ((struct pt_regs *)(tsk)->thread.sp0 - 1)
959 #define KSTK_ESP(tsk) -1 /* sorry. doesn't work for syscall. */
960 #endif /* CONFIG_X86_64 */
962 extern void start_thread(struct pt_regs *regs, unsigned long new_ip,
963 unsigned long new_sp);
966 * This decides where the kernel will search for a free chunk of vm
967 * space during mmap's.
969 #define TASK_UNMAPPED_BASE (PAGE_ALIGN(TASK_SIZE / 3))
971 #define KSTK_EIP(task) (task_pt_regs(task)->ip)
973 /* Get/set a process' ability to use the timestamp counter instruction */
974 #define GET_TSC_CTL(adr) get_tsc_mode((adr))
975 #define SET_TSC_CTL(val) set_tsc_mode((val))
977 extern int get_tsc_mode(unsigned long adr);
978 extern int set_tsc_mode(unsigned int val);
980 #endif /* _ASM_X86_PROCESSOR_H */