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 struct x86_hw_tss doublefault_tss;
170 extern __u32 cpu_caps_cleared[NCAPINTS + NBUGINTS];
171 extern __u32 cpu_caps_set[NCAPINTS + NBUGINTS];
174 DECLARE_PER_CPU_READ_MOSTLY(struct cpuinfo_x86, cpu_info);
175 #define cpu_data(cpu) per_cpu(cpu_info, cpu)
177 #define cpu_info boot_cpu_data
178 #define cpu_data(cpu) boot_cpu_data
181 extern const struct seq_operations cpuinfo_op;
183 #define cache_line_size() (boot_cpu_data.x86_cache_alignment)
185 extern void cpu_detect(struct cpuinfo_x86 *c);
187 static inline unsigned long long l1tf_pfn_limit(void)
189 return BIT_ULL(boot_cpu_data.x86_cache_bits - 1 - PAGE_SHIFT);
192 extern void early_cpu_init(void);
193 extern void identify_boot_cpu(void);
194 extern void identify_secondary_cpu(struct cpuinfo_x86 *);
195 extern void print_cpu_info(struct cpuinfo_x86 *);
196 void print_cpu_msr(struct cpuinfo_x86 *);
199 extern int have_cpuid_p(void);
201 static inline int have_cpuid_p(void)
206 static inline void native_cpuid(unsigned int *eax, unsigned int *ebx,
207 unsigned int *ecx, unsigned int *edx)
209 /* ecx is often an input as well as an output. */
215 : "0" (*eax), "2" (*ecx)
219 #define native_cpuid_reg(reg) \
220 static inline unsigned int native_cpuid_##reg(unsigned int op) \
222 unsigned int eax = op, ebx, ecx = 0, edx; \
224 native_cpuid(&eax, &ebx, &ecx, &edx); \
230 * Native CPUID functions returning a single datum.
232 native_cpuid_reg(eax)
233 native_cpuid_reg(ebx)
234 native_cpuid_reg(ecx)
235 native_cpuid_reg(edx)
238 * Friendlier CR3 helpers.
240 static inline unsigned long read_cr3_pa(void)
242 return __read_cr3() & CR3_ADDR_MASK;
245 static inline unsigned long native_read_cr3_pa(void)
247 return __native_read_cr3() & CR3_ADDR_MASK;
250 static inline void load_cr3(pgd_t *pgdir)
252 write_cr3(__sme_pa(pgdir));
256 * Note that while the legacy 'TSS' name comes from 'Task State Segment',
257 * on modern x86 CPUs the TSS also holds information important to 64-bit mode,
258 * unrelated to the task-switch mechanism:
261 /* This is the TSS defined by the hardware. */
263 unsigned short back_link, __blh;
265 unsigned short ss0, __ss0h;
269 * We don't use ring 1, so ss1 is a convenient scratch space in
270 * the same cacheline as sp0. We use ss1 to cache the value in
271 * MSR_IA32_SYSENTER_CS. When we context switch
272 * MSR_IA32_SYSENTER_CS, we first check if the new value being
273 * written matches ss1, and, if it's not, then we wrmsr the new
274 * value and update ss1.
276 * The only reason we context switch MSR_IA32_SYSENTER_CS is
277 * that we set it to zero in vm86 tasks to avoid corrupting the
278 * stack if we were to go through the sysenter path from vm86
281 unsigned short ss1; /* MSR_IA32_SYSENTER_CS */
283 unsigned short __ss1h;
285 unsigned short ss2, __ss2h;
297 unsigned short es, __esh;
298 unsigned short cs, __csh;
299 unsigned short ss, __ssh;
300 unsigned short ds, __dsh;
301 unsigned short fs, __fsh;
302 unsigned short gs, __gsh;
303 unsigned short ldt, __ldth;
304 unsigned short trace;
305 unsigned short io_bitmap_base;
307 } __attribute__((packed));
314 * We store cpu_current_top_of_stack in sp1 so it's always accessible.
315 * Linux does not use ring 1, so sp1 is not otherwise needed.
320 * Since Linux does not use ring 2, the 'sp2' slot is unused by
321 * hardware. entry_SYSCALL_64 uses it as scratch space to stash
322 * the user RSP value.
333 } __attribute__((packed));
339 #define IO_BITMAP_BITS 65536
340 #define IO_BITMAP_BYTES (IO_BITMAP_BITS / BITS_PER_BYTE)
341 #define IO_BITMAP_LONGS (IO_BITMAP_BYTES / sizeof(long))
343 #define IO_BITMAP_OFFSET_VALID_MAP \
344 (offsetof(struct tss_struct, io_bitmap.bitmap) - \
345 offsetof(struct tss_struct, x86_tss))
347 #define IO_BITMAP_OFFSET_VALID_ALL \
348 (offsetof(struct tss_struct, io_bitmap.mapall) - \
349 offsetof(struct tss_struct, x86_tss))
351 #ifdef CONFIG_X86_IOPL_IOPERM
353 * sizeof(unsigned long) coming from an extra "long" at the end of the
354 * iobitmap. The limit is inclusive, i.e. the last valid byte.
356 # define __KERNEL_TSS_LIMIT \
357 (IO_BITMAP_OFFSET_VALID_ALL + IO_BITMAP_BYTES + \
358 sizeof(unsigned long) - 1)
360 # define __KERNEL_TSS_LIMIT \
361 (offsetof(struct tss_struct, x86_tss) + sizeof(struct x86_hw_tss) - 1)
364 /* Base offset outside of TSS_LIMIT so unpriviledged IO causes #GP */
365 #define IO_BITMAP_OFFSET_INVALID (__KERNEL_TSS_LIMIT + 1)
368 unsigned long words[64];
371 struct entry_stack_page {
372 struct entry_stack stack;
373 } __aligned(PAGE_SIZE);
376 * All IO bitmap related data stored in the TSS:
378 struct x86_io_bitmap {
379 /* The sequence number of the last active bitmap. */
383 * Store the dirty size of the last io bitmap offender. The next
384 * one will have to do the cleanup as the switch out to a non io
385 * bitmap user will just set x86_tss.io_bitmap_base to a value
386 * outside of the TSS limit. So for sane tasks there is no need to
387 * actually touch the io_bitmap at all.
389 unsigned int prev_max;
392 * The extra 1 is there because the CPU will access an
393 * additional byte beyond the end of the IO permission
394 * bitmap. The extra byte must be all 1 bits, and must
395 * be within the limit.
397 unsigned long bitmap[IO_BITMAP_LONGS + 1];
400 * Special I/O bitmap to emulate IOPL(3). All bytes zero,
401 * except the additional byte at the end.
403 unsigned long mapall[IO_BITMAP_LONGS + 1];
408 * The fixed hardware portion. This must not cross a page boundary
409 * at risk of violating the SDM's advice and potentially triggering
412 struct x86_hw_tss x86_tss;
414 #ifdef CONFIG_X86_IOPL_IOPERM
415 struct x86_io_bitmap io_bitmap;
417 } __aligned(PAGE_SIZE);
419 DECLARE_PER_CPU_PAGE_ALIGNED(struct tss_struct, cpu_tss_rw);
421 /* Per CPU interrupt stacks */
423 char stack[IRQ_STACK_SIZE];
424 } __aligned(IRQ_STACK_SIZE);
426 DECLARE_PER_CPU(struct irq_stack *, hardirq_stack_ptr);
429 DECLARE_PER_CPU(unsigned long, cpu_current_top_of_stack);
431 /* The RO copy can't be accessed with this_cpu_xyz(), so use the RW copy. */
432 #define cpu_current_top_of_stack cpu_tss_rw.x86_tss.sp1
436 struct fixed_percpu_data {
438 * GCC hardcodes the stack canary as %gs:40. Since the
439 * irq_stack is the object at %gs:0, we reserve the bottom
440 * 48 bytes of the irq stack for the canary.
443 unsigned long stack_canary;
446 DECLARE_PER_CPU_FIRST(struct fixed_percpu_data, fixed_percpu_data) __visible;
447 DECLARE_INIT_PER_CPU(fixed_percpu_data);
449 static inline unsigned long cpu_kernelmode_gs_base(int cpu)
451 return (unsigned long)per_cpu(fixed_percpu_data.gs_base, cpu);
454 DECLARE_PER_CPU(unsigned int, irq_count);
455 extern asmlinkage void ignore_sysret(void);
457 #if IS_ENABLED(CONFIG_KVM)
458 /* Save actual FS/GS selectors and bases to current->thread */
459 void save_fsgs_for_kvm(void);
462 #ifdef CONFIG_STACKPROTECTOR
464 * Make sure stack canary segment base is cached-aligned:
465 * "For Intel Atom processors, avoid non zero segment base address
466 * that is not aligned to cache line boundary at all cost."
467 * (Optim Ref Manual Assembly/Compiler Coding Rule 15.)
469 struct stack_canary {
470 char __pad[20]; /* canary at %gs:20 */
471 unsigned long canary;
473 DECLARE_PER_CPU_ALIGNED(struct stack_canary, stack_canary);
475 /* Per CPU softirq stack pointer */
476 DECLARE_PER_CPU(struct irq_stack *, softirq_stack_ptr);
479 extern unsigned int fpu_kernel_xstate_size;
480 extern unsigned int fpu_user_xstate_size;
488 struct thread_struct {
489 /* Cached TLS descriptors: */
490 struct desc_struct tls_array[GDT_ENTRY_TLS_ENTRIES];
496 unsigned long sysenter_cs;
500 unsigned short fsindex;
501 unsigned short gsindex;
505 unsigned long fsbase;
506 unsigned long gsbase;
509 * XXX: this could presumably be unsigned short. Alternatively,
510 * 32-bit kernels could be taught to use fsindex instead.
516 /* Save middle states of ptrace breakpoints */
517 struct perf_event *ptrace_bps[HBP_NUM];
518 /* Debug status used for traps, single steps, etc... */
519 unsigned long debugreg6;
520 /* Keep track of the exact dr7 value set by the user */
521 unsigned long ptrace_dr7;
524 unsigned long trap_nr;
525 unsigned long error_code;
527 /* Virtual 86 mode info */
530 /* IO permissions: */
531 struct io_bitmap *io_bitmap;
534 * IOPL. Priviledge level dependent I/O permission which is
535 * emulated via the I/O bitmap to prevent user space from disabling
538 unsigned long iopl_emul;
540 mm_segment_t addr_limit;
542 unsigned int sig_on_uaccess_err:1;
543 unsigned int uaccess_err:1; /* uaccess failed */
545 /* Floating point and extended processor state */
548 * WARNING: 'fpu' is dynamically-sized. It *MUST* be at
553 /* Whitelist the FPU state from the task_struct for hardened usercopy. */
554 static inline void arch_thread_struct_whitelist(unsigned long *offset,
557 *offset = offsetof(struct thread_struct, fpu.state);
558 *size = fpu_kernel_xstate_size;
562 * Thread-synchronous status.
564 * This is different from the flags in that nobody else
565 * ever touches our thread-synchronous status, so we don't
566 * have to worry about atomic accesses.
568 #define TS_COMPAT 0x0002 /* 32bit syscall active (64BIT)*/
571 native_load_sp0(unsigned long sp0)
573 this_cpu_write(cpu_tss_rw.x86_tss.sp0, sp0);
576 static inline void native_swapgs(void)
579 asm volatile("swapgs" ::: "memory");
583 static inline unsigned long current_top_of_stack(void)
586 * We can't read directly from tss.sp0: sp0 on x86_32 is special in
587 * and around vm86 mode and sp0 on x86_64 is special because of the
590 return this_cpu_read_stable(cpu_current_top_of_stack);
593 static inline bool on_thread_stack(void)
595 return (unsigned long)(current_top_of_stack() -
596 current_stack_pointer) < THREAD_SIZE;
599 #ifdef CONFIG_PARAVIRT_XXL
600 #include <asm/paravirt.h>
602 #define __cpuid native_cpuid
604 static inline void load_sp0(unsigned long sp0)
606 native_load_sp0(sp0);
609 #endif /* CONFIG_PARAVIRT_XXL */
611 /* Free all resources held by a thread. */
612 extern void release_thread(struct task_struct *);
614 unsigned long get_wchan(struct task_struct *p);
617 * Generic CPUID function
618 * clear %ecx since some cpus (Cyrix MII) do not set or clear %ecx
619 * resulting in stale register contents being returned.
621 static inline void cpuid(unsigned int op,
622 unsigned int *eax, unsigned int *ebx,
623 unsigned int *ecx, unsigned int *edx)
627 __cpuid(eax, ebx, ecx, edx);
630 /* Some CPUID calls want 'count' to be placed in ecx */
631 static inline void cpuid_count(unsigned int op, int count,
632 unsigned int *eax, unsigned int *ebx,
633 unsigned int *ecx, unsigned int *edx)
637 __cpuid(eax, ebx, ecx, edx);
641 * CPUID functions returning a single datum
643 static inline unsigned int cpuid_eax(unsigned int op)
645 unsigned int eax, ebx, ecx, edx;
647 cpuid(op, &eax, &ebx, &ecx, &edx);
652 static inline unsigned int cpuid_ebx(unsigned int op)
654 unsigned int eax, ebx, ecx, edx;
656 cpuid(op, &eax, &ebx, &ecx, &edx);
661 static inline unsigned int cpuid_ecx(unsigned int op)
663 unsigned int eax, ebx, ecx, edx;
665 cpuid(op, &eax, &ebx, &ecx, &edx);
670 static inline unsigned int cpuid_edx(unsigned int op)
672 unsigned int eax, ebx, ecx, edx;
674 cpuid(op, &eax, &ebx, &ecx, &edx);
679 /* REP NOP (PAUSE) is a good thing to insert into busy-wait loops. */
680 static __always_inline void rep_nop(void)
682 asm volatile("rep; nop" ::: "memory");
685 static __always_inline void cpu_relax(void)
691 * This function forces the icache and prefetched instruction stream to
692 * catch up with reality in two very specific cases:
694 * a) Text was modified using one virtual address and is about to be executed
695 * from the same physical page at a different virtual address.
697 * b) Text was modified on a different CPU, may subsequently be
698 * executed on this CPU, and you want to make sure the new version
699 * gets executed. This generally means you're calling this in a IPI.
701 * If you're calling this for a different reason, you're probably doing
704 static inline void sync_core(void)
707 * There are quite a few ways to do this. IRET-to-self is nice
708 * because it works on every CPU, at any CPL (so it's compatible
709 * with paravirtualization), and it never exits to a hypervisor.
710 * The only down sides are that it's a bit slow (it seems to be
711 * a bit more than 2x slower than the fastest options) and that
712 * it unmasks NMIs. The "push %cs" is needed because, in
713 * paravirtual environments, __KERNEL_CS may not be a valid CS
714 * value when we do IRET directly.
716 * In case NMI unmasking or performance ever becomes a problem,
717 * the next best option appears to be MOV-to-CR2 and an
718 * unconditional jump. That sequence also works on all CPUs,
719 * but it will fault at CPL3 (i.e. Xen PV).
721 * CPUID is the conventional way, but it's nasty: it doesn't
722 * exist on some 486-like CPUs, and it usually exits to a
725 * Like all of Linux's memory ordering operations, this is a
726 * compiler barrier as well.
735 : ASM_CALL_CONSTRAINT : : "memory");
744 "addq $8, (%%rsp)\n\t"
752 : "=&r" (tmp), ASM_CALL_CONSTRAINT : : "cc", "memory");
756 extern void select_idle_routine(const struct cpuinfo_x86 *c);
757 extern void amd_e400_c1e_apic_setup(void);
759 extern unsigned long boot_option_idle_override;
761 enum idle_boot_override {IDLE_NO_OVERRIDE=0, IDLE_HALT, IDLE_NOMWAIT,
764 extern void enable_sep_cpu(void);
765 extern int sysenter_setup(void);
768 /* Defined in head.S */
769 extern struct desc_ptr early_gdt_descr;
771 extern void switch_to_new_gdt(int);
772 extern void load_direct_gdt(int);
773 extern void load_fixmap_gdt(int);
774 extern void load_percpu_segment(int);
775 extern void cpu_init(void);
776 extern void cr4_init(void);
778 static inline unsigned long get_debugctlmsr(void)
780 unsigned long debugctlmsr = 0;
782 #ifndef CONFIG_X86_DEBUGCTLMSR
783 if (boot_cpu_data.x86 < 6)
786 rdmsrl(MSR_IA32_DEBUGCTLMSR, debugctlmsr);
791 static inline void update_debugctlmsr(unsigned long debugctlmsr)
793 #ifndef CONFIG_X86_DEBUGCTLMSR
794 if (boot_cpu_data.x86 < 6)
797 wrmsrl(MSR_IA32_DEBUGCTLMSR, debugctlmsr);
800 extern void set_task_blockstep(struct task_struct *task, bool on);
802 /* Boot loader type from the setup header: */
803 extern int bootloader_type;
804 extern int bootloader_version;
806 extern char ignore_fpu_irq;
808 #define HAVE_ARCH_PICK_MMAP_LAYOUT 1
809 #define ARCH_HAS_PREFETCHW
810 #define ARCH_HAS_SPINLOCK_PREFETCH
813 # define BASE_PREFETCH ""
814 # define ARCH_HAS_PREFETCH
816 # define BASE_PREFETCH "prefetcht0 %P1"
820 * Prefetch instructions for Pentium III (+) and AMD Athlon (+)
822 * It's not worth to care about 3dnow prefetches for the K6
823 * because they are microcoded there and very slow.
825 static inline void prefetch(const void *x)
827 alternative_input(BASE_PREFETCH, "prefetchnta %P1",
829 "m" (*(const char *)x));
833 * 3dnow prefetch to get an exclusive cache line.
834 * Useful for spinlocks to avoid one state transition in the
835 * cache coherency protocol:
837 static inline void prefetchw(const void *x)
839 alternative_input(BASE_PREFETCH, "prefetchw %P1",
840 X86_FEATURE_3DNOWPREFETCH,
841 "m" (*(const char *)x));
844 static inline void spin_lock_prefetch(const void *x)
849 #define TOP_OF_INIT_STACK ((unsigned long)&init_stack + sizeof(init_stack) - \
850 TOP_OF_KERNEL_STACK_PADDING)
852 #define task_top_of_stack(task) ((unsigned long)(task_pt_regs(task) + 1))
854 #define task_pt_regs(task) \
856 unsigned long __ptr = (unsigned long)task_stack_page(task); \
857 __ptr += THREAD_SIZE - TOP_OF_KERNEL_STACK_PADDING; \
858 ((struct pt_regs *)__ptr) - 1; \
863 * User space process size: 3GB (default).
865 #define IA32_PAGE_OFFSET PAGE_OFFSET
866 #define TASK_SIZE PAGE_OFFSET
867 #define TASK_SIZE_LOW TASK_SIZE
868 #define TASK_SIZE_MAX TASK_SIZE
869 #define DEFAULT_MAP_WINDOW TASK_SIZE
870 #define STACK_TOP TASK_SIZE
871 #define STACK_TOP_MAX STACK_TOP
873 #define INIT_THREAD { \
874 .sp0 = TOP_OF_INIT_STACK, \
875 .sysenter_cs = __KERNEL_CS, \
876 .addr_limit = KERNEL_DS, \
879 #define KSTK_ESP(task) (task_pt_regs(task)->sp)
883 * User space process size. This is the first address outside the user range.
884 * There are a few constraints that determine this:
886 * On Intel CPUs, if a SYSCALL instruction is at the highest canonical
887 * address, then that syscall will enter the kernel with a
888 * non-canonical return address, and SYSRET will explode dangerously.
889 * We avoid this particular problem by preventing anything executable
890 * from being mapped at the maximum canonical address.
892 * On AMD CPUs in the Ryzen family, there's a nasty bug in which the
893 * CPUs malfunction if they execute code from the highest canonical page.
894 * They'll speculate right off the end of the canonical space, and
895 * bad things happen. This is worked around in the same way as the
898 * With page table isolation enabled, we map the LDT in ... [stay tuned]
900 #define TASK_SIZE_MAX ((1UL << __VIRTUAL_MASK_SHIFT) - PAGE_SIZE)
902 #define DEFAULT_MAP_WINDOW ((1UL << 47) - PAGE_SIZE)
904 /* This decides where the kernel will search for a free chunk of vm
905 * space during mmap's.
907 #define IA32_PAGE_OFFSET ((current->personality & ADDR_LIMIT_3GB) ? \
908 0xc0000000 : 0xFFFFe000)
910 #define TASK_SIZE_LOW (test_thread_flag(TIF_ADDR32) ? \
911 IA32_PAGE_OFFSET : DEFAULT_MAP_WINDOW)
912 #define TASK_SIZE (test_thread_flag(TIF_ADDR32) ? \
913 IA32_PAGE_OFFSET : TASK_SIZE_MAX)
914 #define TASK_SIZE_OF(child) ((test_tsk_thread_flag(child, TIF_ADDR32)) ? \
915 IA32_PAGE_OFFSET : TASK_SIZE_MAX)
917 #define STACK_TOP TASK_SIZE_LOW
918 #define STACK_TOP_MAX TASK_SIZE_MAX
920 #define INIT_THREAD { \
921 .addr_limit = KERNEL_DS, \
924 extern unsigned long KSTK_ESP(struct task_struct *task);
926 #endif /* CONFIG_X86_64 */
928 extern void start_thread(struct pt_regs *regs, unsigned long new_ip,
929 unsigned long new_sp);
932 * This decides where the kernel will search for a free chunk of vm
933 * space during mmap's.
935 #define __TASK_UNMAPPED_BASE(task_size) (PAGE_ALIGN(task_size / 3))
936 #define TASK_UNMAPPED_BASE __TASK_UNMAPPED_BASE(TASK_SIZE_LOW)
938 #define KSTK_EIP(task) (task_pt_regs(task)->ip)
940 /* Get/set a process' ability to use the timestamp counter instruction */
941 #define GET_TSC_CTL(adr) get_tsc_mode((adr))
942 #define SET_TSC_CTL(val) set_tsc_mode((val))
944 extern int get_tsc_mode(unsigned long adr);
945 extern int set_tsc_mode(unsigned int val);
947 DECLARE_PER_CPU(u64, msr_misc_features_shadow);
949 /* Register/unregister a process' MPX related resource */
950 #define MPX_ENABLE_MANAGEMENT() mpx_enable_management()
951 #define MPX_DISABLE_MANAGEMENT() mpx_disable_management()
953 #ifdef CONFIG_X86_INTEL_MPX
954 extern int mpx_enable_management(void);
955 extern int mpx_disable_management(void);
957 static inline int mpx_enable_management(void)
961 static inline int mpx_disable_management(void)
965 #endif /* CONFIG_X86_INTEL_MPX */
967 #ifdef CONFIG_CPU_SUP_AMD
968 extern u16 amd_get_nb_id(int cpu);
969 extern u32 amd_get_nodes_per_socket(void);
971 static inline u16 amd_get_nb_id(int cpu) { return 0; }
972 static inline u32 amd_get_nodes_per_socket(void) { return 0; }
975 static inline uint32_t hypervisor_cpuid_base(const char *sig, uint32_t leaves)
977 uint32_t base, eax, signature[3];
979 for (base = 0x40000000; base < 0x40010000; base += 0x100) {
980 cpuid(base, &eax, &signature[0], &signature[1], &signature[2]);
982 if (!memcmp(sig, signature, 12) &&
983 (leaves == 0 || ((eax - base) >= leaves)))
990 extern unsigned long arch_align_stack(unsigned long sp);
991 void free_init_pages(const char *what, unsigned long begin, unsigned long end);
992 extern void free_kernel_image_pages(const char *what, void *begin, void *end);
994 void default_idle(void);
996 bool xen_set_default_idle(void);
998 #define xen_set_default_idle 0
1001 void stop_this_cpu(void *dummy);
1002 void df_debug(struct pt_regs *regs, long error_code);
1003 void microcode_check(void);
1005 enum l1tf_mitigations {
1006 L1TF_MITIGATION_OFF,
1007 L1TF_MITIGATION_FLUSH_NOWARN,
1008 L1TF_MITIGATION_FLUSH,
1009 L1TF_MITIGATION_FLUSH_NOSMT,
1010 L1TF_MITIGATION_FULL,
1011 L1TF_MITIGATION_FULL_FORCE
1014 extern enum l1tf_mitigations l1tf_mitigation;
1016 enum mds_mitigations {
1018 MDS_MITIGATION_FULL,
1019 MDS_MITIGATION_VMWERV,
1022 enum taa_mitigations {
1024 TAA_MITIGATION_UCODE_NEEDED,
1025 TAA_MITIGATION_VERW,
1026 TAA_MITIGATION_TSX_DISABLED,
1029 #endif /* _ASM_X86_PROCESSOR_H */