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 */
13 #include <asm/math_emu.h>
14 #include <asm/segment.h>
15 #include <asm/types.h>
16 #include <uapi/asm/sigcontext.h>
17 #include <asm/current.h>
18 #include <asm/cpufeatures.h>
20 #include <asm/pgtable_types.h>
21 #include <asm/percpu.h>
23 #include <asm/desc_defs.h>
25 #include <asm/special_insns.h>
26 #include <asm/fpu/types.h>
27 #include <asm/unwind_hints.h>
29 #include <linux/personality.h>
30 #include <linux/cache.h>
31 #include <linux/threads.h>
32 #include <linux/math64.h>
33 #include <linux/err.h>
34 #include <linux/irqflags.h>
35 #include <linux/mem_encrypt.h>
38 * We handle most unaligned accesses in hardware. On the other hand
39 * unaligned DMA can be quite expensive on some Nehalem processors.
41 * Based on this we disable the IP header alignment in network drivers.
43 #define NET_IP_ALIGN 0
48 * These alignment constraints are for performance in the vSMP case,
49 * but in the task_struct case we must also meet hardware imposed
50 * alignment requirements of the FPU state:
52 #ifdef CONFIG_X86_VSMP
53 # define ARCH_MIN_TASKALIGN (1 << INTERNODE_CACHE_SHIFT)
54 # define ARCH_MIN_MMSTRUCT_ALIGN (1 << INTERNODE_CACHE_SHIFT)
56 # define ARCH_MIN_TASKALIGN __alignof__(union fpregs_state)
57 # define ARCH_MIN_MMSTRUCT_ALIGN 0
65 extern u16 __read_mostly tlb_lli_4k[NR_INFO];
66 extern u16 __read_mostly tlb_lli_2m[NR_INFO];
67 extern u16 __read_mostly tlb_lli_4m[NR_INFO];
68 extern u16 __read_mostly tlb_lld_4k[NR_INFO];
69 extern u16 __read_mostly tlb_lld_2m[NR_INFO];
70 extern u16 __read_mostly tlb_lld_4m[NR_INFO];
71 extern u16 __read_mostly tlb_lld_1g[NR_INFO];
74 * CPU type and hardware bug flags. Kept separately for each CPU.
75 * Members of this structure are referenced in head_32.S, so think twice
76 * before touching them. [mj]
80 __u8 x86; /* CPU family */
81 __u8 x86_vendor; /* CPU vendor */
85 /* Number of 4K pages in DTLB/ITLB combined(in pages): */
90 /* CPUID returned core id bits: */
93 /* Max extended CPUID function supported: */
94 __u32 extended_cpuid_level;
95 /* Maximum supported CPUID level, -1=no CPUID: */
98 * Align to size of unsigned long because the x86_capability array
99 * is passed to bitops which require the alignment. Use unnamed
100 * union to enforce the array is aligned to size of unsigned long.
103 __u32 x86_capability[NCAPINTS + NBUGINTS];
104 unsigned long x86_capability_alignment;
106 char x86_vendor_id[16];
107 char x86_model_id[64];
108 /* in KB - valid for CPUS which support this call: */
109 unsigned int x86_cache_size;
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: */
131 /* Index into per_cpu list: */
134 /* Address space bits used by the cache internally */
136 unsigned initialized : 1;
137 } __randomize_layout;
140 u32 eax, ebx, ecx, edx;
143 enum cpuid_regs_idx {
150 #define X86_VENDOR_INTEL 0
151 #define X86_VENDOR_CYRIX 1
152 #define X86_VENDOR_AMD 2
153 #define X86_VENDOR_UMC 3
154 #define X86_VENDOR_CENTAUR 5
155 #define X86_VENDOR_TRANSMETA 7
156 #define X86_VENDOR_NSC 8
157 #define X86_VENDOR_HYGON 9
158 #define X86_VENDOR_ZHAOXIN 10
159 #define X86_VENDOR_NUM 11
161 #define X86_VENDOR_UNKNOWN 0xff
164 * capabilities of CPUs
166 extern struct cpuinfo_x86 boot_cpu_data;
167 extern struct cpuinfo_x86 new_cpu_data;
169 extern __u32 cpu_caps_cleared[NCAPINTS + NBUGINTS];
170 extern __u32 cpu_caps_set[NCAPINTS + NBUGINTS];
173 DECLARE_PER_CPU_READ_MOSTLY(struct cpuinfo_x86, cpu_info);
174 #define cpu_data(cpu) per_cpu(cpu_info, cpu)
176 #define cpu_info boot_cpu_data
177 #define cpu_data(cpu) boot_cpu_data
180 extern const struct seq_operations cpuinfo_op;
182 #define cache_line_size() (boot_cpu_data.x86_cache_alignment)
184 extern void cpu_detect(struct cpuinfo_x86 *c);
186 static inline unsigned long long l1tf_pfn_limit(void)
188 return BIT_ULL(boot_cpu_data.x86_cache_bits - 1 - PAGE_SHIFT);
191 extern void early_cpu_init(void);
192 extern void identify_boot_cpu(void);
193 extern void identify_secondary_cpu(struct cpuinfo_x86 *);
194 extern void print_cpu_info(struct cpuinfo_x86 *);
195 void print_cpu_msr(struct cpuinfo_x86 *);
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 unsigned long native_read_cr3_pa(void)
246 return __native_read_cr3() & CR3_ADDR_MASK;
249 static inline void load_cr3(pgd_t *pgdir)
251 write_cr3(__sme_pa(pgdir));
255 * Note that while the legacy 'TSS' name comes from 'Task State Segment',
256 * on modern x86 CPUs the TSS also holds information important to 64-bit mode,
257 * unrelated to the task-switch mechanism:
260 /* This is the TSS defined by the hardware. */
262 unsigned short back_link, __blh;
264 unsigned short ss0, __ss0h;
268 * We don't use ring 1, so ss1 is a convenient scratch space in
269 * the same cacheline as sp0. We use ss1 to cache the value in
270 * MSR_IA32_SYSENTER_CS. When we context switch
271 * MSR_IA32_SYSENTER_CS, we first check if the new value being
272 * written matches ss1, and, if it's not, then we wrmsr the new
273 * value and update ss1.
275 * The only reason we context switch MSR_IA32_SYSENTER_CS is
276 * that we set it to zero in vm86 tasks to avoid corrupting the
277 * stack if we were to go through the sysenter path from vm86
280 unsigned short ss1; /* MSR_IA32_SYSENTER_CS */
282 unsigned short __ss1h;
284 unsigned short ss2, __ss2h;
296 unsigned short es, __esh;
297 unsigned short cs, __csh;
298 unsigned short ss, __ssh;
299 unsigned short ds, __dsh;
300 unsigned short fs, __fsh;
301 unsigned short gs, __gsh;
302 unsigned short ldt, __ldth;
303 unsigned short trace;
304 unsigned short io_bitmap_base;
306 } __attribute__((packed));
313 * We store cpu_current_top_of_stack in sp1 so it's always accessible.
314 * Linux does not use ring 1, so sp1 is not otherwise needed.
319 * Since Linux does not use ring 2, the 'sp2' slot is unused by
320 * hardware. entry_SYSCALL_64 uses it as scratch space to stash
321 * the user RSP value.
332 } __attribute__((packed));
338 #define IO_BITMAP_BITS 65536
339 #define IO_BITMAP_BYTES (IO_BITMAP_BITS / BITS_PER_BYTE)
340 #define IO_BITMAP_LONGS (IO_BITMAP_BYTES / sizeof(long))
342 #define IO_BITMAP_OFFSET_VALID_MAP \
343 (offsetof(struct tss_struct, io_bitmap.bitmap) - \
344 offsetof(struct tss_struct, x86_tss))
346 #define IO_BITMAP_OFFSET_VALID_ALL \
347 (offsetof(struct tss_struct, io_bitmap.mapall) - \
348 offsetof(struct tss_struct, x86_tss))
350 #ifdef CONFIG_X86_IOPL_IOPERM
352 * sizeof(unsigned long) coming from an extra "long" at the end of the
353 * iobitmap. The limit is inclusive, i.e. the last valid byte.
355 # define __KERNEL_TSS_LIMIT \
356 (IO_BITMAP_OFFSET_VALID_ALL + IO_BITMAP_BYTES + \
357 sizeof(unsigned long) - 1)
359 # define __KERNEL_TSS_LIMIT \
360 (offsetof(struct tss_struct, x86_tss) + sizeof(struct x86_hw_tss) - 1)
363 /* Base offset outside of TSS_LIMIT so unpriviledged IO causes #GP */
364 #define IO_BITMAP_OFFSET_INVALID (__KERNEL_TSS_LIMIT + 1)
367 unsigned long words[64];
370 struct entry_stack_page {
371 struct entry_stack stack;
372 } __aligned(PAGE_SIZE);
375 * All IO bitmap related data stored in the TSS:
377 struct x86_io_bitmap {
378 /* The sequence number of the last active bitmap. */
382 * Store the dirty size of the last io bitmap offender. The next
383 * one will have to do the cleanup as the switch out to a non io
384 * bitmap user will just set x86_tss.io_bitmap_base to a value
385 * outside of the TSS limit. So for sane tasks there is no need to
386 * actually touch the io_bitmap at all.
388 unsigned int prev_max;
391 * The extra 1 is there because the CPU will access an
392 * additional byte beyond the end of the IO permission
393 * bitmap. The extra byte must be all 1 bits, and must
394 * be within the limit.
396 unsigned long bitmap[IO_BITMAP_LONGS + 1];
399 * Special I/O bitmap to emulate IOPL(3). All bytes zero,
400 * except the additional byte at the end.
402 unsigned long mapall[IO_BITMAP_LONGS + 1];
407 * The fixed hardware portion. This must not cross a page boundary
408 * at risk of violating the SDM's advice and potentially triggering
411 struct x86_hw_tss x86_tss;
413 struct x86_io_bitmap io_bitmap;
414 } __aligned(PAGE_SIZE);
416 DECLARE_PER_CPU_PAGE_ALIGNED(struct tss_struct, cpu_tss_rw);
418 /* Per CPU interrupt stacks */
420 char stack[IRQ_STACK_SIZE];
421 } __aligned(IRQ_STACK_SIZE);
423 DECLARE_PER_CPU(struct irq_stack *, hardirq_stack_ptr);
426 DECLARE_PER_CPU(unsigned long, cpu_current_top_of_stack);
428 /* The RO copy can't be accessed with this_cpu_xyz(), so use the RW copy. */
429 #define cpu_current_top_of_stack cpu_tss_rw.x86_tss.sp1
433 struct fixed_percpu_data {
435 * GCC hardcodes the stack canary as %gs:40. Since the
436 * irq_stack is the object at %gs:0, we reserve the bottom
437 * 48 bytes of the irq stack for the canary.
440 unsigned long stack_canary;
443 DECLARE_PER_CPU_FIRST(struct fixed_percpu_data, fixed_percpu_data) __visible;
444 DECLARE_INIT_PER_CPU(fixed_percpu_data);
446 static inline unsigned long cpu_kernelmode_gs_base(int cpu)
448 return (unsigned long)per_cpu(fixed_percpu_data.gs_base, cpu);
451 DECLARE_PER_CPU(unsigned int, irq_count);
452 extern asmlinkage void ignore_sysret(void);
454 #if IS_ENABLED(CONFIG_KVM)
455 /* Save actual FS/GS selectors and bases to current->thread */
456 void save_fsgs_for_kvm(void);
459 #ifdef CONFIG_STACKPROTECTOR
461 * Make sure stack canary segment base is cached-aligned:
462 * "For Intel Atom processors, avoid non zero segment base address
463 * that is not aligned to cache line boundary at all cost."
464 * (Optim Ref Manual Assembly/Compiler Coding Rule 15.)
466 struct stack_canary {
467 char __pad[20]; /* canary at %gs:20 */
468 unsigned long canary;
470 DECLARE_PER_CPU_ALIGNED(struct stack_canary, stack_canary);
472 /* Per CPU softirq stack pointer */
473 DECLARE_PER_CPU(struct irq_stack *, softirq_stack_ptr);
476 extern unsigned int fpu_kernel_xstate_size;
477 extern unsigned int fpu_user_xstate_size;
485 struct thread_struct {
486 /* Cached TLS descriptors: */
487 struct desc_struct tls_array[GDT_ENTRY_TLS_ENTRIES];
493 unsigned long sysenter_cs;
497 unsigned short fsindex;
498 unsigned short gsindex;
502 unsigned long fsbase;
503 unsigned long gsbase;
506 * XXX: this could presumably be unsigned short. Alternatively,
507 * 32-bit kernels could be taught to use fsindex instead.
513 /* Save middle states of ptrace breakpoints */
514 struct perf_event *ptrace_bps[HBP_NUM];
515 /* Debug status used for traps, single steps, etc... */
516 unsigned long debugreg6;
517 /* Keep track of the exact dr7 value set by the user */
518 unsigned long ptrace_dr7;
521 unsigned long trap_nr;
522 unsigned long error_code;
524 /* Virtual 86 mode info */
527 /* IO permissions: */
528 struct io_bitmap *io_bitmap;
531 * IOPL. Priviledge level dependent I/O permission which is
532 * emulated via the I/O bitmap to prevent user space from disabling
535 unsigned long iopl_emul;
537 mm_segment_t addr_limit;
539 unsigned int sig_on_uaccess_err:1;
540 unsigned int uaccess_err:1; /* uaccess failed */
542 /* Floating point and extended processor state */
545 * WARNING: 'fpu' is dynamically-sized. It *MUST* be at
550 /* Whitelist the FPU state from the task_struct for hardened usercopy. */
551 static inline void arch_thread_struct_whitelist(unsigned long *offset,
554 *offset = offsetof(struct thread_struct, fpu.state);
555 *size = fpu_kernel_xstate_size;
559 * Thread-synchronous status.
561 * This is different from the flags in that nobody else
562 * ever touches our thread-synchronous status, so we don't
563 * have to worry about atomic accesses.
565 #define TS_COMPAT 0x0002 /* 32bit syscall active (64BIT)*/
568 native_load_sp0(unsigned long sp0)
570 this_cpu_write(cpu_tss_rw.x86_tss.sp0, sp0);
573 static inline void native_swapgs(void)
576 asm volatile("swapgs" ::: "memory");
580 static inline unsigned long current_top_of_stack(void)
583 * We can't read directly from tss.sp0: sp0 on x86_32 is special in
584 * and around vm86 mode and sp0 on x86_64 is special because of the
587 return this_cpu_read_stable(cpu_current_top_of_stack);
590 static inline bool on_thread_stack(void)
592 return (unsigned long)(current_top_of_stack() -
593 current_stack_pointer) < THREAD_SIZE;
596 #ifdef CONFIG_PARAVIRT_XXL
597 #include <asm/paravirt.h>
599 #define __cpuid native_cpuid
601 static inline void load_sp0(unsigned long sp0)
603 native_load_sp0(sp0);
606 #endif /* CONFIG_PARAVIRT_XXL */
608 /* Free all resources held by a thread. */
609 extern void release_thread(struct task_struct *);
611 unsigned long get_wchan(struct task_struct *p);
614 * Generic CPUID function
615 * clear %ecx since some cpus (Cyrix MII) do not set or clear %ecx
616 * resulting in stale register contents being returned.
618 static inline void cpuid(unsigned int op,
619 unsigned int *eax, unsigned int *ebx,
620 unsigned int *ecx, unsigned int *edx)
624 __cpuid(eax, ebx, ecx, edx);
627 /* Some CPUID calls want 'count' to be placed in ecx */
628 static inline void cpuid_count(unsigned int op, int count,
629 unsigned int *eax, unsigned int *ebx,
630 unsigned int *ecx, unsigned int *edx)
634 __cpuid(eax, ebx, ecx, edx);
638 * CPUID functions returning a single datum
640 static inline unsigned int cpuid_eax(unsigned int op)
642 unsigned int eax, ebx, ecx, edx;
644 cpuid(op, &eax, &ebx, &ecx, &edx);
649 static inline unsigned int cpuid_ebx(unsigned int op)
651 unsigned int eax, ebx, ecx, edx;
653 cpuid(op, &eax, &ebx, &ecx, &edx);
658 static inline unsigned int cpuid_ecx(unsigned int op)
660 unsigned int eax, ebx, ecx, edx;
662 cpuid(op, &eax, &ebx, &ecx, &edx);
667 static inline unsigned int cpuid_edx(unsigned int op)
669 unsigned int eax, ebx, ecx, edx;
671 cpuid(op, &eax, &ebx, &ecx, &edx);
676 /* REP NOP (PAUSE) is a good thing to insert into busy-wait loops. */
677 static __always_inline void rep_nop(void)
679 asm volatile("rep; nop" ::: "memory");
682 static __always_inline void cpu_relax(void)
688 * This function forces the icache and prefetched instruction stream to
689 * catch up with reality in two very specific cases:
691 * a) Text was modified using one virtual address and is about to be executed
692 * from the same physical page at a different virtual address.
694 * b) Text was modified on a different CPU, may subsequently be
695 * executed on this CPU, and you want to make sure the new version
696 * gets executed. This generally means you're calling this in a IPI.
698 * If you're calling this for a different reason, you're probably doing
701 static inline void sync_core(void)
704 * There are quite a few ways to do this. IRET-to-self is nice
705 * because it works on every CPU, at any CPL (so it's compatible
706 * with paravirtualization), and it never exits to a hypervisor.
707 * The only down sides are that it's a bit slow (it seems to be
708 * a bit more than 2x slower than the fastest options) and that
709 * it unmasks NMIs. The "push %cs" is needed because, in
710 * paravirtual environments, __KERNEL_CS may not be a valid CS
711 * value when we do IRET directly.
713 * In case NMI unmasking or performance ever becomes a problem,
714 * the next best option appears to be MOV-to-CR2 and an
715 * unconditional jump. That sequence also works on all CPUs,
716 * but it will fault at CPL3 (i.e. Xen PV).
718 * CPUID is the conventional way, but it's nasty: it doesn't
719 * exist on some 486-like CPUs, and it usually exits to a
722 * Like all of Linux's memory ordering operations, this is a
723 * compiler barrier as well.
732 : ASM_CALL_CONSTRAINT : : "memory");
741 "addq $8, (%%rsp)\n\t"
749 : "=&r" (tmp), ASM_CALL_CONSTRAINT : : "cc", "memory");
753 extern void select_idle_routine(const struct cpuinfo_x86 *c);
754 extern void amd_e400_c1e_apic_setup(void);
756 extern unsigned long boot_option_idle_override;
758 enum idle_boot_override {IDLE_NO_OVERRIDE=0, IDLE_HALT, IDLE_NOMWAIT,
761 extern void enable_sep_cpu(void);
762 extern int sysenter_setup(void);
765 /* Defined in head.S */
766 extern struct desc_ptr early_gdt_descr;
768 extern void switch_to_new_gdt(int);
769 extern void load_direct_gdt(int);
770 extern void load_fixmap_gdt(int);
771 extern void load_percpu_segment(int);
772 extern void cpu_init(void);
773 extern void cr4_init(void);
775 static inline unsigned long get_debugctlmsr(void)
777 unsigned long debugctlmsr = 0;
779 #ifndef CONFIG_X86_DEBUGCTLMSR
780 if (boot_cpu_data.x86 < 6)
783 rdmsrl(MSR_IA32_DEBUGCTLMSR, debugctlmsr);
788 static inline void update_debugctlmsr(unsigned long debugctlmsr)
790 #ifndef CONFIG_X86_DEBUGCTLMSR
791 if (boot_cpu_data.x86 < 6)
794 wrmsrl(MSR_IA32_DEBUGCTLMSR, debugctlmsr);
797 extern void set_task_blockstep(struct task_struct *task, bool on);
799 /* Boot loader type from the setup header: */
800 extern int bootloader_type;
801 extern int bootloader_version;
803 extern char ignore_fpu_irq;
805 #define HAVE_ARCH_PICK_MMAP_LAYOUT 1
806 #define ARCH_HAS_PREFETCHW
807 #define ARCH_HAS_SPINLOCK_PREFETCH
810 # define BASE_PREFETCH ""
811 # define ARCH_HAS_PREFETCH
813 # define BASE_PREFETCH "prefetcht0 %P1"
817 * Prefetch instructions for Pentium III (+) and AMD Athlon (+)
819 * It's not worth to care about 3dnow prefetches for the K6
820 * because they are microcoded there and very slow.
822 static inline void prefetch(const void *x)
824 alternative_input(BASE_PREFETCH, "prefetchnta %P1",
826 "m" (*(const char *)x));
830 * 3dnow prefetch to get an exclusive cache line.
831 * Useful for spinlocks to avoid one state transition in the
832 * cache coherency protocol:
834 static inline void prefetchw(const void *x)
836 alternative_input(BASE_PREFETCH, "prefetchw %P1",
837 X86_FEATURE_3DNOWPREFETCH,
838 "m" (*(const char *)x));
841 static inline void spin_lock_prefetch(const void *x)
846 #define TOP_OF_INIT_STACK ((unsigned long)&init_stack + sizeof(init_stack) - \
847 TOP_OF_KERNEL_STACK_PADDING)
849 #define task_top_of_stack(task) ((unsigned long)(task_pt_regs(task) + 1))
851 #define task_pt_regs(task) \
853 unsigned long __ptr = (unsigned long)task_stack_page(task); \
854 __ptr += THREAD_SIZE - TOP_OF_KERNEL_STACK_PADDING; \
855 ((struct pt_regs *)__ptr) - 1; \
860 * User space process size: 3GB (default).
862 #define IA32_PAGE_OFFSET PAGE_OFFSET
863 #define TASK_SIZE PAGE_OFFSET
864 #define TASK_SIZE_LOW TASK_SIZE
865 #define TASK_SIZE_MAX TASK_SIZE
866 #define DEFAULT_MAP_WINDOW TASK_SIZE
867 #define STACK_TOP TASK_SIZE
868 #define STACK_TOP_MAX STACK_TOP
870 #define INIT_THREAD { \
871 .sp0 = TOP_OF_INIT_STACK, \
872 .sysenter_cs = __KERNEL_CS, \
873 .addr_limit = KERNEL_DS, \
876 #define KSTK_ESP(task) (task_pt_regs(task)->sp)
880 * User space process size. This is the first address outside the user range.
881 * There are a few constraints that determine this:
883 * On Intel CPUs, if a SYSCALL instruction is at the highest canonical
884 * address, then that syscall will enter the kernel with a
885 * non-canonical return address, and SYSRET will explode dangerously.
886 * We avoid this particular problem by preventing anything executable
887 * from being mapped at the maximum canonical address.
889 * On AMD CPUs in the Ryzen family, there's a nasty bug in which the
890 * CPUs malfunction if they execute code from the highest canonical page.
891 * They'll speculate right off the end of the canonical space, and
892 * bad things happen. This is worked around in the same way as the
895 * With page table isolation enabled, we map the LDT in ... [stay tuned]
897 #define TASK_SIZE_MAX ((1UL << __VIRTUAL_MASK_SHIFT) - PAGE_SIZE)
899 #define DEFAULT_MAP_WINDOW ((1UL << 47) - PAGE_SIZE)
901 /* This decides where the kernel will search for a free chunk of vm
902 * space during mmap's.
904 #define IA32_PAGE_OFFSET ((current->personality & ADDR_LIMIT_3GB) ? \
905 0xc0000000 : 0xFFFFe000)
907 #define TASK_SIZE_LOW (test_thread_flag(TIF_ADDR32) ? \
908 IA32_PAGE_OFFSET : DEFAULT_MAP_WINDOW)
909 #define TASK_SIZE (test_thread_flag(TIF_ADDR32) ? \
910 IA32_PAGE_OFFSET : TASK_SIZE_MAX)
911 #define TASK_SIZE_OF(child) ((test_tsk_thread_flag(child, TIF_ADDR32)) ? \
912 IA32_PAGE_OFFSET : TASK_SIZE_MAX)
914 #define STACK_TOP TASK_SIZE_LOW
915 #define STACK_TOP_MAX TASK_SIZE_MAX
917 #define INIT_THREAD { \
918 .addr_limit = KERNEL_DS, \
921 extern unsigned long KSTK_ESP(struct task_struct *task);
923 #endif /* CONFIG_X86_64 */
925 extern void start_thread(struct pt_regs *regs, unsigned long new_ip,
926 unsigned long new_sp);
929 * This decides where the kernel will search for a free chunk of vm
930 * space during mmap's.
932 #define __TASK_UNMAPPED_BASE(task_size) (PAGE_ALIGN(task_size / 3))
933 #define TASK_UNMAPPED_BASE __TASK_UNMAPPED_BASE(TASK_SIZE_LOW)
935 #define KSTK_EIP(task) (task_pt_regs(task)->ip)
937 /* Get/set a process' ability to use the timestamp counter instruction */
938 #define GET_TSC_CTL(adr) get_tsc_mode((adr))
939 #define SET_TSC_CTL(val) set_tsc_mode((val))
941 extern int get_tsc_mode(unsigned long adr);
942 extern int set_tsc_mode(unsigned int val);
944 DECLARE_PER_CPU(u64, msr_misc_features_shadow);
946 /* Register/unregister a process' MPX related resource */
947 #define MPX_ENABLE_MANAGEMENT() mpx_enable_management()
948 #define MPX_DISABLE_MANAGEMENT() mpx_disable_management()
950 #ifdef CONFIG_X86_INTEL_MPX
951 extern int mpx_enable_management(void);
952 extern int mpx_disable_management(void);
954 static inline int mpx_enable_management(void)
958 static inline int mpx_disable_management(void)
962 #endif /* CONFIG_X86_INTEL_MPX */
964 #ifdef CONFIG_CPU_SUP_AMD
965 extern u16 amd_get_nb_id(int cpu);
966 extern u32 amd_get_nodes_per_socket(void);
968 static inline u16 amd_get_nb_id(int cpu) { return 0; }
969 static inline u32 amd_get_nodes_per_socket(void) { return 0; }
972 static inline uint32_t hypervisor_cpuid_base(const char *sig, uint32_t leaves)
974 uint32_t base, eax, signature[3];
976 for (base = 0x40000000; base < 0x40010000; base += 0x100) {
977 cpuid(base, &eax, &signature[0], &signature[1], &signature[2]);
979 if (!memcmp(sig, signature, 12) &&
980 (leaves == 0 || ((eax - base) >= leaves)))
987 extern unsigned long arch_align_stack(unsigned long sp);
988 void free_init_pages(const char *what, unsigned long begin, unsigned long end);
989 extern void free_kernel_image_pages(const char *what, void *begin, void *end);
991 void default_idle(void);
993 bool xen_set_default_idle(void);
995 #define xen_set_default_idle 0
998 void stop_this_cpu(void *dummy);
999 void microcode_check(void);
1001 enum l1tf_mitigations {
1002 L1TF_MITIGATION_OFF,
1003 L1TF_MITIGATION_FLUSH_NOWARN,
1004 L1TF_MITIGATION_FLUSH,
1005 L1TF_MITIGATION_FLUSH_NOSMT,
1006 L1TF_MITIGATION_FULL,
1007 L1TF_MITIGATION_FULL_FORCE
1010 extern enum l1tf_mitigations l1tf_mitigation;
1012 enum mds_mitigations {
1014 MDS_MITIGATION_FULL,
1015 MDS_MITIGATION_VMWERV,
1018 #endif /* _ASM_X86_PROCESSOR_H */