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 unsigned initialized
: 1;
136 } __randomize_layout
;
139 u32 eax
, ebx
, ecx
, edx
;
142 enum cpuid_regs_idx
{
149 #define X86_VENDOR_INTEL 0
150 #define X86_VENDOR_CYRIX 1
151 #define X86_VENDOR_AMD 2
152 #define X86_VENDOR_UMC 3
153 #define X86_VENDOR_CENTAUR 5
154 #define X86_VENDOR_TRANSMETA 7
155 #define X86_VENDOR_NSC 8
156 #define X86_VENDOR_NUM 9
158 #define X86_VENDOR_UNKNOWN 0xff
161 * capabilities of CPUs
163 extern struct cpuinfo_x86 boot_cpu_data
;
164 extern struct cpuinfo_x86 new_cpu_data
;
166 extern struct x86_hw_tss doublefault_tss
;
167 extern __u32 cpu_caps_cleared
[NCAPINTS
+ NBUGINTS
];
168 extern __u32 cpu_caps_set
[NCAPINTS
+ NBUGINTS
];
171 DECLARE_PER_CPU_READ_MOSTLY(struct cpuinfo_x86
, cpu_info
);
172 #define cpu_data(cpu) per_cpu(cpu_info, cpu)
174 #define cpu_info boot_cpu_data
175 #define cpu_data(cpu) boot_cpu_data
178 extern const struct seq_operations cpuinfo_op
;
180 #define cache_line_size() (boot_cpu_data.x86_cache_alignment)
182 extern void cpu_detect(struct cpuinfo_x86
*c
);
184 static inline unsigned long l1tf_pfn_limit(void)
186 return BIT(boot_cpu_data
.x86_phys_bits
- 1 - PAGE_SHIFT
) - 1;
189 extern void early_cpu_init(void);
190 extern void identify_boot_cpu(void);
191 extern void identify_secondary_cpu(struct cpuinfo_x86
*);
192 extern void print_cpu_info(struct cpuinfo_x86
*);
193 void print_cpu_msr(struct cpuinfo_x86
*);
196 extern int have_cpuid_p(void);
198 static inline int have_cpuid_p(void)
203 static inline void native_cpuid(unsigned int *eax
, unsigned int *ebx
,
204 unsigned int *ecx
, unsigned int *edx
)
206 /* ecx is often an input as well as an output. */
212 : "0" (*eax
), "2" (*ecx
)
216 #define native_cpuid_reg(reg) \
217 static inline unsigned int native_cpuid_##reg(unsigned int op) \
219 unsigned int eax = op, ebx, ecx = 0, edx; \
221 native_cpuid(&eax, &ebx, &ecx, &edx); \
227 * Native CPUID functions returning a single datum.
229 native_cpuid_reg(eax
)
230 native_cpuid_reg(ebx
)
231 native_cpuid_reg(ecx
)
232 native_cpuid_reg(edx
)
235 * Friendlier CR3 helpers.
237 static inline unsigned long read_cr3_pa(void)
239 return __read_cr3() & CR3_ADDR_MASK
;
242 static inline unsigned long native_read_cr3_pa(void)
244 return __native_read_cr3() & CR3_ADDR_MASK
;
247 static inline void load_cr3(pgd_t
*pgdir
)
249 write_cr3(__sme_pa(pgdir
));
253 * Note that while the legacy 'TSS' name comes from 'Task State Segment',
254 * on modern x86 CPUs the TSS also holds information important to 64-bit mode,
255 * unrelated to the task-switch mechanism:
258 /* This is the TSS defined by the hardware. */
260 unsigned short back_link
, __blh
;
262 unsigned short ss0
, __ss0h
;
266 * We don't use ring 1, so ss1 is a convenient scratch space in
267 * the same cacheline as sp0. We use ss1 to cache the value in
268 * MSR_IA32_SYSENTER_CS. When we context switch
269 * MSR_IA32_SYSENTER_CS, we first check if the new value being
270 * written matches ss1, and, if it's not, then we wrmsr the new
271 * value and update ss1.
273 * The only reason we context switch MSR_IA32_SYSENTER_CS is
274 * that we set it to zero in vm86 tasks to avoid corrupting the
275 * stack if we were to go through the sysenter path from vm86
278 unsigned short ss1
; /* MSR_IA32_SYSENTER_CS */
280 unsigned short __ss1h
;
282 unsigned short ss2
, __ss2h
;
294 unsigned short es
, __esh
;
295 unsigned short cs
, __csh
;
296 unsigned short ss
, __ssh
;
297 unsigned short ds
, __dsh
;
298 unsigned short fs
, __fsh
;
299 unsigned short gs
, __gsh
;
300 unsigned short ldt
, __ldth
;
301 unsigned short trace
;
302 unsigned short io_bitmap_base
;
304 } __attribute__((packed
));
311 * We store cpu_current_top_of_stack in sp1 so it's always accessible.
312 * Linux does not use ring 1, so sp1 is not otherwise needed.
324 } __attribute__((packed
));
330 #define IO_BITMAP_BITS 65536
331 #define IO_BITMAP_BYTES (IO_BITMAP_BITS/8)
332 #define IO_BITMAP_LONGS (IO_BITMAP_BYTES/sizeof(long))
333 #define IO_BITMAP_OFFSET (offsetof(struct tss_struct, io_bitmap) - offsetof(struct tss_struct, x86_tss))
334 #define INVALID_IO_BITMAP_OFFSET 0x8000
337 unsigned long words
[64];
340 struct entry_stack_page
{
341 struct entry_stack stack
;
342 } __aligned(PAGE_SIZE
);
346 * The fixed hardware portion. This must not cross a page boundary
347 * at risk of violating the SDM's advice and potentially triggering
350 struct x86_hw_tss x86_tss
;
353 * The extra 1 is there because the CPU will access an
354 * additional byte beyond the end of the IO permission
355 * bitmap. The extra byte must be all 1 bits, and must
356 * be within the limit.
358 unsigned long io_bitmap
[IO_BITMAP_LONGS
+ 1];
359 } __aligned(PAGE_SIZE
);
361 DECLARE_PER_CPU_PAGE_ALIGNED(struct tss_struct
, cpu_tss_rw
);
364 * sizeof(unsigned long) coming from an extra "long" at the end
367 * -1? seg base+limit should be pointing to the address of the
370 #define __KERNEL_TSS_LIMIT \
371 (IO_BITMAP_OFFSET + IO_BITMAP_BYTES + sizeof(unsigned long) - 1)
374 DECLARE_PER_CPU(unsigned long, cpu_current_top_of_stack
);
376 /* The RO copy can't be accessed with this_cpu_xyz(), so use the RW copy. */
377 #define cpu_current_top_of_stack cpu_tss_rw.x86_tss.sp1
381 * Save the original ist values for checking stack pointers during debugging
384 unsigned long ist
[7];
388 DECLARE_PER_CPU(struct orig_ist
, orig_ist
);
390 union irq_stack_union
{
391 char irq_stack
[IRQ_STACK_SIZE
];
393 * GCC hardcodes the stack canary as %gs:40. Since the
394 * irq_stack is the object at %gs:0, we reserve the bottom
395 * 48 bytes of the irq stack for the canary.
399 unsigned long stack_canary
;
403 DECLARE_PER_CPU_FIRST(union irq_stack_union
, irq_stack_union
) __visible
;
404 DECLARE_INIT_PER_CPU(irq_stack_union
);
406 static inline unsigned long cpu_kernelmode_gs_base(int cpu
)
408 return (unsigned long)per_cpu(irq_stack_union
.gs_base
, cpu
);
411 DECLARE_PER_CPU(char *, irq_stack_ptr
);
412 DECLARE_PER_CPU(unsigned int, irq_count
);
413 extern asmlinkage
void ignore_sysret(void);
415 #if IS_ENABLED(CONFIG_KVM)
416 /* Save actual FS/GS selectors and bases to current->thread */
417 void save_fsgs_for_kvm(void);
420 #ifdef CONFIG_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
514 /* Whitelist the FPU state from the task_struct for hardened usercopy. */
515 static inline void arch_thread_struct_whitelist(unsigned long *offset
,
518 *offset
= offsetof(struct thread_struct
, fpu
.state
);
519 *size
= fpu_kernel_xstate_size
;
523 * Thread-synchronous status.
525 * This is different from the flags in that nobody else
526 * ever touches our thread-synchronous status, so we don't
527 * have to worry about atomic accesses.
529 #define TS_COMPAT 0x0002 /* 32bit syscall active (64BIT)*/
532 * Set IOPL bits in EFLAGS from given mask
534 static inline void native_set_iopl_mask(unsigned mask
)
539 asm volatile ("pushfl;"
546 : "i" (~X86_EFLAGS_IOPL
), "r" (mask
));
551 native_load_sp0(unsigned long sp0
)
553 this_cpu_write(cpu_tss_rw
.x86_tss
.sp0
, sp0
);
556 static inline void native_swapgs(void)
559 asm volatile("swapgs" ::: "memory");
563 static inline unsigned long current_top_of_stack(void)
566 * We can't read directly from tss.sp0: sp0 on x86_32 is special in
567 * and around vm86 mode and sp0 on x86_64 is special because of the
570 return this_cpu_read_stable(cpu_current_top_of_stack
);
573 static inline bool on_thread_stack(void)
575 return (unsigned long)(current_top_of_stack() -
576 current_stack_pointer
) < THREAD_SIZE
;
579 #ifdef CONFIG_PARAVIRT
580 #include <asm/paravirt.h>
582 #define __cpuid native_cpuid
584 static inline void load_sp0(unsigned long sp0
)
586 native_load_sp0(sp0
);
589 #define set_iopl_mask native_set_iopl_mask
590 #endif /* CONFIG_PARAVIRT */
592 /* Free all resources held by a thread. */
593 extern void release_thread(struct task_struct
*);
595 unsigned long get_wchan(struct task_struct
*p
);
598 * Generic CPUID function
599 * clear %ecx since some cpus (Cyrix MII) do not set or clear %ecx
600 * resulting in stale register contents being returned.
602 static inline void cpuid(unsigned int op
,
603 unsigned int *eax
, unsigned int *ebx
,
604 unsigned int *ecx
, unsigned int *edx
)
608 __cpuid(eax
, ebx
, ecx
, edx
);
611 /* Some CPUID calls want 'count' to be placed in ecx */
612 static inline void cpuid_count(unsigned int op
, int count
,
613 unsigned int *eax
, unsigned int *ebx
,
614 unsigned int *ecx
, unsigned int *edx
)
618 __cpuid(eax
, ebx
, ecx
, edx
);
622 * CPUID functions returning a single datum
624 static inline unsigned int cpuid_eax(unsigned int op
)
626 unsigned int eax
, ebx
, ecx
, edx
;
628 cpuid(op
, &eax
, &ebx
, &ecx
, &edx
);
633 static inline unsigned int cpuid_ebx(unsigned int op
)
635 unsigned int eax
, ebx
, ecx
, edx
;
637 cpuid(op
, &eax
, &ebx
, &ecx
, &edx
);
642 static inline unsigned int cpuid_ecx(unsigned int op
)
644 unsigned int eax
, ebx
, ecx
, edx
;
646 cpuid(op
, &eax
, &ebx
, &ecx
, &edx
);
651 static inline unsigned int cpuid_edx(unsigned int op
)
653 unsigned int eax
, ebx
, ecx
, edx
;
655 cpuid(op
, &eax
, &ebx
, &ecx
, &edx
);
660 /* REP NOP (PAUSE) is a good thing to insert into busy-wait loops. */
661 static __always_inline
void rep_nop(void)
663 asm volatile("rep; nop" ::: "memory");
666 static __always_inline
void cpu_relax(void)
672 * This function forces the icache and prefetched instruction stream to
673 * catch up with reality in two very specific cases:
675 * a) Text was modified using one virtual address and is about to be executed
676 * from the same physical page at a different virtual address.
678 * b) Text was modified on a different CPU, may subsequently be
679 * executed on this CPU, and you want to make sure the new version
680 * gets executed. This generally means you're calling this in a IPI.
682 * If you're calling this for a different reason, you're probably doing
685 static inline void sync_core(void)
688 * There are quite a few ways to do this. IRET-to-self is nice
689 * because it works on every CPU, at any CPL (so it's compatible
690 * with paravirtualization), and it never exits to a hypervisor.
691 * The only down sides are that it's a bit slow (it seems to be
692 * a bit more than 2x slower than the fastest options) and that
693 * it unmasks NMIs. The "push %cs" is needed because, in
694 * paravirtual environments, __KERNEL_CS may not be a valid CS
695 * value when we do IRET directly.
697 * In case NMI unmasking or performance ever becomes a problem,
698 * the next best option appears to be MOV-to-CR2 and an
699 * unconditional jump. That sequence also works on all CPUs,
700 * but it will fault at CPL3 (i.e. Xen PV).
702 * CPUID is the conventional way, but it's nasty: it doesn't
703 * exist on some 486-like CPUs, and it usually exits to a
706 * Like all of Linux's memory ordering operations, this is a
707 * compiler barrier as well.
716 : ASM_CALL_CONSTRAINT
: : "memory");
725 "addq $8, (%%rsp)\n\t"
733 : "=&r" (tmp
), ASM_CALL_CONSTRAINT
: : "cc", "memory");
737 extern void select_idle_routine(const struct cpuinfo_x86
*c
);
738 extern void amd_e400_c1e_apic_setup(void);
740 extern unsigned long boot_option_idle_override
;
742 enum idle_boot_override
{IDLE_NO_OVERRIDE
=0, IDLE_HALT
, IDLE_NOMWAIT
,
745 extern void enable_sep_cpu(void);
746 extern int sysenter_setup(void);
748 void early_trap_pf_init(void);
750 /* Defined in head.S */
751 extern struct desc_ptr early_gdt_descr
;
753 extern void switch_to_new_gdt(int);
754 extern void load_direct_gdt(int);
755 extern void load_fixmap_gdt(int);
756 extern void load_percpu_segment(int);
757 extern void cpu_init(void);
759 static inline unsigned long get_debugctlmsr(void)
761 unsigned long debugctlmsr
= 0;
763 #ifndef CONFIG_X86_DEBUGCTLMSR
764 if (boot_cpu_data
.x86
< 6)
767 rdmsrl(MSR_IA32_DEBUGCTLMSR
, debugctlmsr
);
772 static inline void update_debugctlmsr(unsigned long debugctlmsr
)
774 #ifndef CONFIG_X86_DEBUGCTLMSR
775 if (boot_cpu_data
.x86
< 6)
778 wrmsrl(MSR_IA32_DEBUGCTLMSR
, debugctlmsr
);
781 extern void set_task_blockstep(struct task_struct
*task
, bool on
);
783 /* Boot loader type from the setup header: */
784 extern int bootloader_type
;
785 extern int bootloader_version
;
787 extern char ignore_fpu_irq
;
789 #define HAVE_ARCH_PICK_MMAP_LAYOUT 1
790 #define ARCH_HAS_PREFETCHW
791 #define ARCH_HAS_SPINLOCK_PREFETCH
794 # define BASE_PREFETCH ""
795 # define ARCH_HAS_PREFETCH
797 # define BASE_PREFETCH "prefetcht0 %P1"
801 * Prefetch instructions for Pentium III (+) and AMD Athlon (+)
803 * It's not worth to care about 3dnow prefetches for the K6
804 * because they are microcoded there and very slow.
806 static inline void prefetch(const void *x
)
808 alternative_input(BASE_PREFETCH
, "prefetchnta %P1",
810 "m" (*(const char *)x
));
814 * 3dnow prefetch to get an exclusive cache line.
815 * Useful for spinlocks to avoid one state transition in the
816 * cache coherency protocol:
818 static inline void prefetchw(const void *x
)
820 alternative_input(BASE_PREFETCH
, "prefetchw %P1",
821 X86_FEATURE_3DNOWPREFETCH
,
822 "m" (*(const char *)x
));
825 static inline void spin_lock_prefetch(const void *x
)
830 #define TOP_OF_INIT_STACK ((unsigned long)&init_stack + sizeof(init_stack) - \
831 TOP_OF_KERNEL_STACK_PADDING)
833 #define task_top_of_stack(task) ((unsigned long)(task_pt_regs(task) + 1))
835 #define task_pt_regs(task) \
837 unsigned long __ptr = (unsigned long)task_stack_page(task); \
838 __ptr += THREAD_SIZE - TOP_OF_KERNEL_STACK_PADDING; \
839 ((struct pt_regs *)__ptr) - 1; \
844 * User space process size: 3GB (default).
846 #define IA32_PAGE_OFFSET PAGE_OFFSET
847 #define TASK_SIZE PAGE_OFFSET
848 #define TASK_SIZE_LOW TASK_SIZE
849 #define TASK_SIZE_MAX TASK_SIZE
850 #define DEFAULT_MAP_WINDOW TASK_SIZE
851 #define STACK_TOP TASK_SIZE
852 #define STACK_TOP_MAX STACK_TOP
854 #define INIT_THREAD { \
855 .sp0 = TOP_OF_INIT_STACK, \
856 .sysenter_cs = __KERNEL_CS, \
857 .io_bitmap_ptr = NULL, \
858 .addr_limit = KERNEL_DS, \
861 #define KSTK_ESP(task) (task_pt_regs(task)->sp)
865 * User space process size. This is the first address outside the user range.
866 * There are a few constraints that determine this:
868 * On Intel CPUs, if a SYSCALL instruction is at the highest canonical
869 * address, then that syscall will enter the kernel with a
870 * non-canonical return address, and SYSRET will explode dangerously.
871 * We avoid this particular problem by preventing anything executable
872 * from being mapped at the maximum canonical address.
874 * On AMD CPUs in the Ryzen family, there's a nasty bug in which the
875 * CPUs malfunction if they execute code from the highest canonical page.
876 * They'll speculate right off the end of the canonical space, and
877 * bad things happen. This is worked around in the same way as the
880 * With page table isolation enabled, we map the LDT in ... [stay tuned]
882 #define TASK_SIZE_MAX ((1UL << __VIRTUAL_MASK_SHIFT) - PAGE_SIZE)
884 #define DEFAULT_MAP_WINDOW ((1UL << 47) - PAGE_SIZE)
886 /* This decides where the kernel will search for a free chunk of vm
887 * space during mmap's.
889 #define IA32_PAGE_OFFSET ((current->personality & ADDR_LIMIT_3GB) ? \
890 0xc0000000 : 0xFFFFe000)
892 #define TASK_SIZE_LOW (test_thread_flag(TIF_ADDR32) ? \
893 IA32_PAGE_OFFSET : DEFAULT_MAP_WINDOW)
894 #define TASK_SIZE (test_thread_flag(TIF_ADDR32) ? \
895 IA32_PAGE_OFFSET : TASK_SIZE_MAX)
896 #define TASK_SIZE_OF(child) ((test_tsk_thread_flag(child, TIF_ADDR32)) ? \
897 IA32_PAGE_OFFSET : TASK_SIZE_MAX)
899 #define STACK_TOP TASK_SIZE_LOW
900 #define STACK_TOP_MAX TASK_SIZE_MAX
902 #define INIT_THREAD { \
903 .addr_limit = KERNEL_DS, \
906 extern unsigned long KSTK_ESP(struct task_struct
*task
);
908 #endif /* CONFIG_X86_64 */
910 extern void start_thread(struct pt_regs
*regs
, unsigned long new_ip
,
911 unsigned long new_sp
);
914 * This decides where the kernel will search for a free chunk of vm
915 * space during mmap's.
917 #define __TASK_UNMAPPED_BASE(task_size) (PAGE_ALIGN(task_size / 3))
918 #define TASK_UNMAPPED_BASE __TASK_UNMAPPED_BASE(TASK_SIZE_LOW)
920 #define KSTK_EIP(task) (task_pt_regs(task)->ip)
922 /* Get/set a process' ability to use the timestamp counter instruction */
923 #define GET_TSC_CTL(adr) get_tsc_mode((adr))
924 #define SET_TSC_CTL(val) set_tsc_mode((val))
926 extern int get_tsc_mode(unsigned long adr
);
927 extern int set_tsc_mode(unsigned int val
);
929 DECLARE_PER_CPU(u64
, msr_misc_features_shadow
);
931 /* Register/unregister a process' MPX related resource */
932 #define MPX_ENABLE_MANAGEMENT() mpx_enable_management()
933 #define MPX_DISABLE_MANAGEMENT() mpx_disable_management()
935 #ifdef CONFIG_X86_INTEL_MPX
936 extern int mpx_enable_management(void);
937 extern int mpx_disable_management(void);
939 static inline int mpx_enable_management(void)
943 static inline int mpx_disable_management(void)
947 #endif /* CONFIG_X86_INTEL_MPX */
949 #ifdef CONFIG_CPU_SUP_AMD
950 extern u16
amd_get_nb_id(int cpu
);
951 extern u32
amd_get_nodes_per_socket(void);
953 static inline u16
amd_get_nb_id(int cpu
) { return 0; }
954 static inline u32
amd_get_nodes_per_socket(void) { return 0; }
957 static inline uint32_t hypervisor_cpuid_base(const char *sig
, uint32_t leaves
)
959 uint32_t base
, eax
, signature
[3];
961 for (base
= 0x40000000; base
< 0x40010000; base
+= 0x100) {
962 cpuid(base
, &eax
, &signature
[0], &signature
[1], &signature
[2]);
964 if (!memcmp(sig
, signature
, 12) &&
965 (leaves
== 0 || ((eax
- base
) >= leaves
)))
972 extern unsigned long arch_align_stack(unsigned long sp
);
973 extern void free_init_pages(char *what
, unsigned long begin
, unsigned long end
);
975 void default_idle(void);
977 bool xen_set_default_idle(void);
979 #define xen_set_default_idle 0
982 void stop_this_cpu(void *dummy
);
983 void df_debug(struct pt_regs
*regs
, long error_code
);
984 void microcode_check(void);
985 #endif /* _ASM_X86_PROCESSOR_H */