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/math64.h>
31 #include <linux/init.h>
35 * Default implementation of macro that returns current
36 * instruction pointer ("program counter").
38 static inline void *current_text_addr(void)
42 asm volatile("mov $1f, %0; 1:":"=r" (pc));
47 #ifdef CONFIG_X86_VSMP
48 # define ARCH_MIN_TASKALIGN (1 << INTERNODE_CACHE_SHIFT)
49 # define ARCH_MIN_MMSTRUCT_ALIGN (1 << INTERNODE_CACHE_SHIFT)
51 # define ARCH_MIN_TASKALIGN 16
52 # define ARCH_MIN_MMSTRUCT_ALIGN 0
56 * CPU type and hardware bug flags. Kept separately for each CPU.
57 * Members of this structure are referenced in head.S, so think twice
58 * before touching them. [mj]
62 __u8 x86; /* CPU family */
63 __u8 x86_vendor; /* CPU vendor */
67 char wp_works_ok; /* It doesn't on 386's */
69 /* Problems on some 486Dx4's and old 386's: */
78 /* Number of 4K pages in DTLB/ITLB combined(in pages): */
83 /* CPUID returned core id bits: */
85 /* Max extended CPUID function supported: */
86 __u32 extended_cpuid_level;
87 /* Maximum supported CPUID level, -1=no CPUID: */
89 __u32 x86_capability[NCAPINTS];
90 char x86_vendor_id[16];
91 char x86_model_id[64];
92 /* in KB - valid for CPUS which support this call: */
94 int x86_cache_alignment; /* In bytes */
96 unsigned long loops_per_jiffy;
98 /* cpus sharing the last level cache: */
99 cpumask_var_t llc_shared_map;
101 /* cpuid returned max cores value: */
105 u16 x86_clflush_size;
107 /* number of cores as seen by the OS: */
109 /* Physical processor id: */
113 /* Index into per_cpu list: */
116 unsigned int x86_hyper_vendor;
117 } __attribute__((__aligned__(SMP_CACHE_BYTES)));
119 #define X86_VENDOR_INTEL 0
120 #define X86_VENDOR_CYRIX 1
121 #define X86_VENDOR_AMD 2
122 #define X86_VENDOR_UMC 3
123 #define X86_VENDOR_CENTAUR 5
124 #define X86_VENDOR_TRANSMETA 7
125 #define X86_VENDOR_NSC 8
126 #define X86_VENDOR_NUM 9
128 #define X86_VENDOR_UNKNOWN 0xff
130 #define X86_HYPER_VENDOR_NONE 0
131 #define X86_HYPER_VENDOR_VMWARE 1
134 * capabilities of CPUs
136 extern struct cpuinfo_x86 boot_cpu_data;
137 extern struct cpuinfo_x86 new_cpu_data;
139 extern struct tss_struct doublefault_tss;
140 extern __u32 cpu_caps_cleared[NCAPINTS];
141 extern __u32 cpu_caps_set[NCAPINTS];
144 DECLARE_PER_CPU_SHARED_ALIGNED(struct cpuinfo_x86, cpu_info);
145 #define cpu_data(cpu) per_cpu(cpu_info, cpu)
146 #define current_cpu_data __get_cpu_var(cpu_info)
148 #define cpu_data(cpu) boot_cpu_data
149 #define current_cpu_data boot_cpu_data
152 extern const struct seq_operations cpuinfo_op;
154 static inline int hlt_works(int cpu)
157 return cpu_data(cpu).hlt_works_ok;
163 #define cache_line_size() (boot_cpu_data.x86_cache_alignment)
165 extern void cpu_detect(struct cpuinfo_x86 *c);
167 extern struct pt_regs *idle_regs(struct pt_regs *);
169 extern void early_cpu_init(void);
170 extern void identify_boot_cpu(void);
171 extern void identify_secondary_cpu(struct cpuinfo_x86 *);
172 extern void print_cpu_info(struct cpuinfo_x86 *);
173 extern void init_scattered_cpuid_features(struct cpuinfo_x86 *c);
174 extern unsigned int init_intel_cacheinfo(struct cpuinfo_x86 *c);
175 extern unsigned short num_cache_leaves;
177 extern void detect_extended_topology(struct cpuinfo_x86 *c);
178 extern void detect_ht(struct cpuinfo_x86 *c);
180 static inline void native_cpuid(unsigned int *eax, unsigned int *ebx,
181 unsigned int *ecx, unsigned int *edx)
183 /* ecx is often an input as well as an output. */
189 : "0" (*eax), "2" (*ecx));
192 static inline void load_cr3(pgd_t *pgdir)
194 write_cr3(__pa(pgdir));
198 /* This is the TSS defined by the hardware. */
200 unsigned short back_link, __blh;
202 unsigned short ss0, __ss0h;
204 /* ss1 caches MSR_IA32_SYSENTER_CS: */
205 unsigned short ss1, __ss1h;
207 unsigned short ss2, __ss2h;
219 unsigned short es, __esh;
220 unsigned short cs, __csh;
221 unsigned short ss, __ssh;
222 unsigned short ds, __dsh;
223 unsigned short fs, __fsh;
224 unsigned short gs, __gsh;
225 unsigned short ldt, __ldth;
226 unsigned short trace;
227 unsigned short io_bitmap_base;
229 } __attribute__((packed));
243 } __attribute__((packed)) ____cacheline_aligned;
249 #define IO_BITMAP_BITS 65536
250 #define IO_BITMAP_BYTES (IO_BITMAP_BITS/8)
251 #define IO_BITMAP_LONGS (IO_BITMAP_BYTES/sizeof(long))
252 #define IO_BITMAP_OFFSET offsetof(struct tss_struct, io_bitmap)
253 #define INVALID_IO_BITMAP_OFFSET 0x8000
257 * The hardware state:
259 struct x86_hw_tss x86_tss;
262 * The extra 1 is there because the CPU will access an
263 * additional byte beyond the end of the IO permission
264 * bitmap. The extra byte must be all 1 bits, and must
265 * be within the limit.
267 unsigned long io_bitmap[IO_BITMAP_LONGS + 1];
270 * .. and then another 0x100 bytes for the emergency kernel stack:
272 unsigned long stack[64];
274 } ____cacheline_aligned;
276 DECLARE_PER_CPU_SHARED_ALIGNED(struct tss_struct, init_tss);
279 * Save the original ist values for checking stack pointers during debugging
282 unsigned long ist[7];
285 #define MXCSR_DEFAULT 0x1f80
287 struct i387_fsave_struct {
288 u32 cwd; /* FPU Control Word */
289 u32 swd; /* FPU Status Word */
290 u32 twd; /* FPU Tag Word */
291 u32 fip; /* FPU IP Offset */
292 u32 fcs; /* FPU IP Selector */
293 u32 foo; /* FPU Operand Pointer Offset */
294 u32 fos; /* FPU Operand Pointer Selector */
296 /* 8*10 bytes for each FP-reg = 80 bytes: */
299 /* Software status information [not touched by FSAVE ]: */
303 struct i387_fxsave_struct {
304 u16 cwd; /* Control Word */
305 u16 swd; /* Status Word */
306 u16 twd; /* Tag Word */
307 u16 fop; /* Last Instruction Opcode */
310 u64 rip; /* Instruction Pointer */
311 u64 rdp; /* Data Pointer */
314 u32 fip; /* FPU IP Offset */
315 u32 fcs; /* FPU IP Selector */
316 u32 foo; /* FPU Operand Offset */
317 u32 fos; /* FPU Operand Selector */
320 u32 mxcsr; /* MXCSR Register State */
321 u32 mxcsr_mask; /* MXCSR Mask */
323 /* 8*16 bytes for each FP-reg = 128 bytes: */
326 /* 16*16 bytes for each XMM-reg = 256 bytes: */
336 } __attribute__((aligned(16)));
338 struct i387_soft_struct {
346 /* 8*10 bytes for each FP-reg = 80 bytes: */
354 struct math_emu_info *info;
359 /* 16 * 16 bytes for each YMMH-reg = 256 bytes */
363 struct xsave_hdr_struct {
367 } __attribute__((packed));
369 struct xsave_struct {
370 struct i387_fxsave_struct i387;
371 struct xsave_hdr_struct xsave_hdr;
372 struct ymmh_struct ymmh;
373 /* new processor state extensions will go here */
374 } __attribute__ ((packed, aligned (64)));
376 union thread_xstate {
377 struct i387_fsave_struct fsave;
378 struct i387_fxsave_struct fxsave;
379 struct i387_soft_struct soft;
380 struct xsave_struct xsave;
384 DECLARE_PER_CPU(struct orig_ist, orig_ist);
386 union irq_stack_union {
387 char irq_stack[IRQ_STACK_SIZE];
389 * GCC hardcodes the stack canary as %gs:40. Since the
390 * irq_stack is the object at %gs:0, we reserve the bottom
391 * 48 bytes of the irq stack for the canary.
395 unsigned long stack_canary;
399 DECLARE_PER_CPU_FIRST(union irq_stack_union, irq_stack_union);
400 DECLARE_INIT_PER_CPU(irq_stack_union);
402 DECLARE_PER_CPU(char *, irq_stack_ptr);
403 DECLARE_PER_CPU(unsigned int, irq_count);
404 extern unsigned long kernel_eflags;
405 extern asmlinkage void ignore_sysret(void);
407 #ifdef CONFIG_CC_STACKPROTECTOR
409 * Make sure stack canary segment base is cached-aligned:
410 * "For Intel Atom processors, avoid non zero segment base address
411 * that is not aligned to cache line boundary at all cost."
412 * (Optim Ref Manual Assembly/Compiler Coding Rule 15.)
414 struct stack_canary {
415 char __pad[20]; /* canary at %gs:20 */
416 unsigned long canary;
418 DECLARE_PER_CPU_ALIGNED(struct stack_canary, stack_canary);
422 extern unsigned int xstate_size;
423 extern void free_thread_xstate(struct task_struct *);
424 extern struct kmem_cache *task_xstate_cachep;
428 struct thread_struct {
429 /* Cached TLS descriptors: */
430 struct desc_struct tls_array[GDT_ENTRY_TLS_ENTRIES];
434 unsigned long sysenter_cs;
436 unsigned long usersp; /* Copy from PDA */
439 unsigned short fsindex;
440 unsigned short gsindex;
449 /* Save middle states of ptrace breakpoints */
450 struct perf_event *ptrace_bps[HBP_NUM];
451 /* Debug status used for traps, single steps, etc... */
452 unsigned long debugreg6;
453 /* Keep track of the exact dr7 value set by the user */
454 unsigned long ptrace_dr7;
457 unsigned long trap_no;
458 unsigned long error_code;
459 /* floating point and extended processor state */
460 union thread_xstate *xstate;
462 /* Virtual 86 mode info */
463 struct vm86_struct __user *vm86_info;
464 unsigned long screen_bitmap;
465 unsigned long v86flags;
466 unsigned long v86mask;
467 unsigned long saved_sp0;
468 unsigned int saved_fs;
469 unsigned int saved_gs;
471 /* IO permissions: */
472 unsigned long *io_bitmap_ptr;
474 /* Max allowed port in the bitmap, in bytes: */
475 unsigned io_bitmap_max;
476 /* MSR_IA32_DEBUGCTLMSR value to switch in if TIF_DEBUGCTLMSR is set. */
477 unsigned long debugctlmsr;
478 /* Debug Store context; see asm/ds.h */
479 struct ds_context *ds_ctx;
482 static inline unsigned long native_get_debugreg(int regno)
484 unsigned long val = 0; /* Damn you, gcc! */
488 asm("mov %%db0, %0" :"=r" (val));
491 asm("mov %%db1, %0" :"=r" (val));
494 asm("mov %%db2, %0" :"=r" (val));
497 asm("mov %%db3, %0" :"=r" (val));
500 asm("mov %%db6, %0" :"=r" (val));
503 asm("mov %%db7, %0" :"=r" (val));
511 static inline void native_set_debugreg(int regno, unsigned long value)
515 asm("mov %0, %%db0" ::"r" (value));
518 asm("mov %0, %%db1" ::"r" (value));
521 asm("mov %0, %%db2" ::"r" (value));
524 asm("mov %0, %%db3" ::"r" (value));
527 asm("mov %0, %%db6" ::"r" (value));
530 asm("mov %0, %%db7" ::"r" (value));
538 * Set IOPL bits in EFLAGS from given mask
540 static inline void native_set_iopl_mask(unsigned mask)
545 asm volatile ("pushfl;"
552 : "i" (~X86_EFLAGS_IOPL), "r" (mask));
557 native_load_sp0(struct tss_struct *tss, struct thread_struct *thread)
559 tss->x86_tss.sp0 = thread->sp0;
561 /* Only happens when SEP is enabled, no need to test "SEP"arately: */
562 if (unlikely(tss->x86_tss.ss1 != thread->sysenter_cs)) {
563 tss->x86_tss.ss1 = thread->sysenter_cs;
564 wrmsr(MSR_IA32_SYSENTER_CS, thread->sysenter_cs, 0);
569 static inline void native_swapgs(void)
572 asm volatile("swapgs" ::: "memory");
576 #ifdef CONFIG_PARAVIRT
577 #include <asm/paravirt.h>
579 #define __cpuid native_cpuid
580 #define paravirt_enabled() 0
583 * These special macros can be used to get or set a debugging register
585 #define get_debugreg(var, register) \
586 (var) = native_get_debugreg(register)
587 #define set_debugreg(value, register) \
588 native_set_debugreg(register, value)
590 static inline void load_sp0(struct tss_struct *tss,
591 struct thread_struct *thread)
593 native_load_sp0(tss, thread);
596 #define set_iopl_mask native_set_iopl_mask
597 #endif /* CONFIG_PARAVIRT */
600 * Save the cr4 feature set we're using (ie
601 * Pentium 4MB enable and PPro Global page
602 * enable), so that any CPU's that boot up
603 * after us can get the correct flags.
605 extern unsigned long mmu_cr4_features;
607 static inline void set_in_cr4(unsigned long mask)
611 mmu_cr4_features |= mask;
617 static inline void clear_in_cr4(unsigned long mask)
621 mmu_cr4_features &= ~mask;
633 * create a kernel thread without removing it from tasklists
635 extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
637 /* Free all resources held by a thread. */
638 extern void release_thread(struct task_struct *);
640 /* Prepare to copy thread state - unlazy all lazy state */
641 extern void prepare_to_copy(struct task_struct *tsk);
643 unsigned long get_wchan(struct task_struct *p);
646 * Generic CPUID function
647 * clear %ecx since some cpus (Cyrix MII) do not set or clear %ecx
648 * resulting in stale register contents being returned.
650 static inline void cpuid(unsigned int op,
651 unsigned int *eax, unsigned int *ebx,
652 unsigned int *ecx, unsigned int *edx)
656 __cpuid(eax, ebx, ecx, edx);
659 /* Some CPUID calls want 'count' to be placed in ecx */
660 static inline void cpuid_count(unsigned int op, int count,
661 unsigned int *eax, unsigned int *ebx,
662 unsigned int *ecx, unsigned int *edx)
666 __cpuid(eax, ebx, ecx, edx);
670 * CPUID functions returning a single datum
672 static inline unsigned int cpuid_eax(unsigned int op)
674 unsigned int eax, ebx, ecx, edx;
676 cpuid(op, &eax, &ebx, &ecx, &edx);
681 static inline unsigned int cpuid_ebx(unsigned int op)
683 unsigned int eax, ebx, ecx, edx;
685 cpuid(op, &eax, &ebx, &ecx, &edx);
690 static inline unsigned int cpuid_ecx(unsigned int op)
692 unsigned int eax, ebx, ecx, edx;
694 cpuid(op, &eax, &ebx, &ecx, &edx);
699 static inline unsigned int cpuid_edx(unsigned int op)
701 unsigned int eax, ebx, ecx, edx;
703 cpuid(op, &eax, &ebx, &ecx, &edx);
708 /* REP NOP (PAUSE) is a good thing to insert into busy-wait loops. */
709 static inline void rep_nop(void)
711 asm volatile("rep; nop" ::: "memory");
714 static inline void cpu_relax(void)
719 /* Stop speculative execution and prefetching of modified code. */
720 static inline void sync_core(void)
724 #if defined(CONFIG_M386) || defined(CONFIG_M486)
725 if (boot_cpu_data.x86 < 5)
726 /* There is no speculative execution.
727 * jmp is a barrier to prefetching. */
728 asm volatile("jmp 1f\n1:\n" ::: "memory");
731 /* cpuid is a barrier to speculative execution.
732 * Prefetched instructions are automatically
733 * invalidated when modified. */
734 asm volatile("cpuid" : "=a" (tmp) : "0" (1)
735 : "ebx", "ecx", "edx", "memory");
738 static inline void __monitor(const void *eax, unsigned long ecx,
741 /* "monitor %eax, %ecx, %edx;" */
742 asm volatile(".byte 0x0f, 0x01, 0xc8;"
743 :: "a" (eax), "c" (ecx), "d"(edx));
746 static inline void __mwait(unsigned long eax, unsigned long ecx)
748 /* "mwait %eax, %ecx;" */
749 asm volatile(".byte 0x0f, 0x01, 0xc9;"
750 :: "a" (eax), "c" (ecx));
753 static inline void __sti_mwait(unsigned long eax, unsigned long ecx)
756 /* "mwait %eax, %ecx;" */
757 asm volatile("sti; .byte 0x0f, 0x01, 0xc9;"
758 :: "a" (eax), "c" (ecx));
761 extern void mwait_idle_with_hints(unsigned long eax, unsigned long ecx);
763 extern void select_idle_routine(const struct cpuinfo_x86 *c);
764 extern void init_c1e_mask(void);
766 extern unsigned long boot_option_idle_override;
767 extern unsigned long idle_halt;
768 extern unsigned long idle_nomwait;
771 * on systems with caches, caches must be flashed as the absolute
772 * last instruction before going into a suspended halt. Otherwise,
773 * dirty data can linger in the cache and become stale on resume,
774 * leading to strange errors.
776 * perform a variety of operations to guarantee that the compiler
777 * will not reorder instructions. wbinvd itself is serializing
778 * so the processor will not reorder.
780 * Systems without cache can just go into halt.
782 static inline void wbinvd_halt(void)
785 /* check for clflush to determine if wbinvd is legal */
787 asm volatile("cli; wbinvd; 1: hlt; jmp 1b" : : : "memory");
793 extern void enable_sep_cpu(void);
794 extern int sysenter_setup(void);
796 /* Defined in head.S */
797 extern struct desc_ptr early_gdt_descr;
799 extern void cpu_set_gdt(int);
800 extern void switch_to_new_gdt(int);
801 extern void load_percpu_segment(int);
802 extern void cpu_init(void);
804 static inline unsigned long get_debugctlmsr(void)
806 unsigned long debugctlmsr = 0;
808 #ifndef CONFIG_X86_DEBUGCTLMSR
809 if (boot_cpu_data.x86 < 6)
812 rdmsrl(MSR_IA32_DEBUGCTLMSR, debugctlmsr);
817 static inline unsigned long get_debugctlmsr_on_cpu(int cpu)
822 #ifndef CONFIG_X86_DEBUGCTLMSR
823 if (boot_cpu_data.x86 < 6)
826 rdmsr_on_cpu(cpu, MSR_IA32_DEBUGCTLMSR, &val1, &val2);
827 debugctlmsr = val1 | ((u64)val2 << 32);
832 static inline void update_debugctlmsr(unsigned long debugctlmsr)
834 #ifndef CONFIG_X86_DEBUGCTLMSR
835 if (boot_cpu_data.x86 < 6)
838 wrmsrl(MSR_IA32_DEBUGCTLMSR, debugctlmsr);
841 static inline void update_debugctlmsr_on_cpu(int cpu,
842 unsigned long debugctlmsr)
844 #ifndef CONFIG_X86_DEBUGCTLMSR
845 if (boot_cpu_data.x86 < 6)
848 wrmsr_on_cpu(cpu, MSR_IA32_DEBUGCTLMSR,
849 (u32)((u64)debugctlmsr),
850 (u32)((u64)debugctlmsr >> 32));
854 * from system description table in BIOS. Mostly for MCA use, but
855 * others may find it useful:
857 extern unsigned int machine_id;
858 extern unsigned int machine_submodel_id;
859 extern unsigned int BIOS_revision;
861 /* Boot loader type from the setup header: */
862 extern int bootloader_type;
863 extern int bootloader_version;
865 extern char ignore_fpu_irq;
867 #define HAVE_ARCH_PICK_MMAP_LAYOUT 1
868 #define ARCH_HAS_PREFETCHW
869 #define ARCH_HAS_SPINLOCK_PREFETCH
872 # define BASE_PREFETCH ASM_NOP4
873 # define ARCH_HAS_PREFETCH
875 # define BASE_PREFETCH "prefetcht0 (%1)"
879 * Prefetch instructions for Pentium III (+) and AMD Athlon (+)
881 * It's not worth to care about 3dnow prefetches for the K6
882 * because they are microcoded there and very slow.
884 static inline void prefetch(const void *x)
886 alternative_input(BASE_PREFETCH,
893 * 3dnow prefetch to get an exclusive cache line.
894 * Useful for spinlocks to avoid one state transition in the
895 * cache coherency protocol:
897 static inline void prefetchw(const void *x)
899 alternative_input(BASE_PREFETCH,
905 static inline void spin_lock_prefetch(const void *x)
912 * User space process size: 3GB (default).
914 #define TASK_SIZE PAGE_OFFSET
915 #define TASK_SIZE_MAX TASK_SIZE
916 #define STACK_TOP TASK_SIZE
917 #define STACK_TOP_MAX STACK_TOP
919 #define INIT_THREAD { \
920 .sp0 = sizeof(init_stack) + (long)&init_stack, \
922 .sysenter_cs = __KERNEL_CS, \
923 .io_bitmap_ptr = NULL, \
927 * Note that the .io_bitmap member must be extra-big. This is because
928 * the CPU will access an additional byte beyond the end of the IO
929 * permission bitmap. The extra byte must be all 1 bits, and must
930 * be within the limit.
934 .sp0 = sizeof(init_stack) + (long)&init_stack, \
935 .ss0 = __KERNEL_DS, \
936 .ss1 = __KERNEL_CS, \
937 .io_bitmap_base = INVALID_IO_BITMAP_OFFSET, \
939 .io_bitmap = { [0 ... IO_BITMAP_LONGS] = ~0 }, \
942 extern unsigned long thread_saved_pc(struct task_struct *tsk);
944 #define THREAD_SIZE_LONGS (THREAD_SIZE/sizeof(unsigned long))
945 #define KSTK_TOP(info) \
947 unsigned long *__ptr = (unsigned long *)(info); \
948 (unsigned long)(&__ptr[THREAD_SIZE_LONGS]); \
952 * The below -8 is to reserve 8 bytes on top of the ring0 stack.
953 * This is necessary to guarantee that the entire "struct pt_regs"
954 * is accessable even if the CPU haven't stored the SS/ESP registers
955 * on the stack (interrupt gate does not save these registers
956 * when switching to the same priv ring).
957 * Therefore beware: accessing the ss/esp fields of the
958 * "struct pt_regs" is possible, but they may contain the
959 * completely wrong values.
961 #define task_pt_regs(task) \
963 struct pt_regs *__regs__; \
964 __regs__ = (struct pt_regs *)(KSTK_TOP(task_stack_page(task))-8); \
968 #define KSTK_ESP(task) (task_pt_regs(task)->sp)
972 * User space process size. 47bits minus one guard page.
974 #define TASK_SIZE_MAX ((1UL << 47) - PAGE_SIZE)
976 /* This decides where the kernel will search for a free chunk of vm
977 * space during mmap's.
979 #define IA32_PAGE_OFFSET ((current->personality & ADDR_LIMIT_3GB) ? \
980 0xc0000000 : 0xFFFFe000)
982 #define TASK_SIZE (test_thread_flag(TIF_IA32) ? \
983 IA32_PAGE_OFFSET : TASK_SIZE_MAX)
984 #define TASK_SIZE_OF(child) ((test_tsk_thread_flag(child, TIF_IA32)) ? \
985 IA32_PAGE_OFFSET : TASK_SIZE_MAX)
987 #define STACK_TOP TASK_SIZE
988 #define STACK_TOP_MAX TASK_SIZE_MAX
990 #define INIT_THREAD { \
991 .sp0 = (unsigned long)&init_stack + sizeof(init_stack) \
995 .x86_tss.sp0 = (unsigned long)&init_stack + sizeof(init_stack) \
999 * Return saved PC of a blocked thread.
1000 * What is this good for? it will be always the scheduler or ret_from_fork.
1002 #define thread_saved_pc(t) (*(unsigned long *)((t)->thread.sp - 8))
1004 #define task_pt_regs(tsk) ((struct pt_regs *)(tsk)->thread.sp0 - 1)
1005 extern unsigned long KSTK_ESP(struct task_struct *task);
1006 #endif /* CONFIG_X86_64 */
1008 extern void start_thread(struct pt_regs *regs, unsigned long new_ip,
1009 unsigned long new_sp);
1012 * This decides where the kernel will search for a free chunk of vm
1013 * space during mmap's.
1015 #define TASK_UNMAPPED_BASE (PAGE_ALIGN(TASK_SIZE / 3))
1017 #define KSTK_EIP(task) (task_pt_regs(task)->ip)
1019 /* Get/set a process' ability to use the timestamp counter instruction */
1020 #define GET_TSC_CTL(adr) get_tsc_mode((adr))
1021 #define SET_TSC_CTL(val) set_tsc_mode((val))
1023 extern int get_tsc_mode(unsigned long adr);
1024 extern int set_tsc_mode(unsigned int val);
1026 extern int amd_get_nb_id(int cpu);
1032 static inline void get_aperfmperf(struct aperfmperf *am)
1034 WARN_ON_ONCE(!boot_cpu_has(X86_FEATURE_APERFMPERF));
1036 rdmsrl(MSR_IA32_APERF, am->aperf);
1037 rdmsrl(MSR_IA32_MPERF, am->mperf);
1040 #define APERFMPERF_SHIFT 10
1043 unsigned long calc_aperfmperf_ratio(struct aperfmperf *old,
1044 struct aperfmperf *new)
1046 u64 aperf = new->aperf - old->aperf;
1047 u64 mperf = new->mperf - old->mperf;
1048 unsigned long ratio = aperf;
1050 mperf >>= APERFMPERF_SHIFT;
1052 ratio = div64_u64(aperf, mperf);
1057 #endif /* _ASM_X86_PROCESSOR_H */