1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _ASM_X86_PROCESSOR_H 3 #define _ASM_X86_PROCESSOR_H 4 5 #include <asm/processor-flags.h> 6 7 /* Forward declaration, a strange C thing */ 8 struct task_struct; 9 struct mm_struct; 10 struct io_bitmap; 11 struct vm86; 12 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> 19 #include <asm/cpuid.h> 20 #include <asm/page.h> 21 #include <asm/pgtable_types.h> 22 #include <asm/percpu.h> 23 #include <asm/msr.h> 24 #include <asm/desc_defs.h> 25 #include <asm/nops.h> 26 #include <asm/special_insns.h> 27 #include <asm/fpu/types.h> 28 #include <asm/unwind_hints.h> 29 #include <asm/vmxfeatures.h> 30 #include <asm/vdso/processor.h> 31 #include <asm/shstk.h> 32 33 #include <linux/personality.h> 34 #include <linux/cache.h> 35 #include <linux/threads.h> 36 #include <linux/math64.h> 37 #include <linux/err.h> 38 #include <linux/irqflags.h> 39 #include <linux/mem_encrypt.h> 40 41 /* 42 * We handle most unaligned accesses in hardware. On the other hand 43 * unaligned DMA can be quite expensive on some Nehalem processors. 44 * 45 * Based on this we disable the IP header alignment in network drivers. 46 */ 47 #define NET_IP_ALIGN 0 48 49 #define HBP_NUM 4 50 51 /* 52 * These alignment constraints are for performance in the vSMP case, 53 * but in the task_struct case we must also meet hardware imposed 54 * alignment requirements of the FPU state: 55 */ 56 #ifdef CONFIG_X86_VSMP 57 # define ARCH_MIN_TASKALIGN (1 << INTERNODE_CACHE_SHIFT) 58 # define ARCH_MIN_MMSTRUCT_ALIGN (1 << INTERNODE_CACHE_SHIFT) 59 #else 60 # define ARCH_MIN_TASKALIGN __alignof__(union fpregs_state) 61 # define ARCH_MIN_MMSTRUCT_ALIGN 0 62 #endif 63 64 enum tlb_infos { 65 ENTRIES, 66 NR_INFO 67 }; 68 69 extern u16 __read_mostly tlb_lli_4k[NR_INFO]; 70 extern u16 __read_mostly tlb_lli_2m[NR_INFO]; 71 extern u16 __read_mostly tlb_lli_4m[NR_INFO]; 72 extern u16 __read_mostly tlb_lld_4k[NR_INFO]; 73 extern u16 __read_mostly tlb_lld_2m[NR_INFO]; 74 extern u16 __read_mostly tlb_lld_4m[NR_INFO]; 75 extern u16 __read_mostly tlb_lld_1g[NR_INFO]; 76 77 /* 78 * CPU type and hardware bug flags. Kept separately for each CPU. 79 * Members of this structure are referenced in head_32.S, so think twice 80 * before touching them. [mj] 81 */ 82 83 struct cpuinfo_x86 { 84 __u8 x86; /* CPU family */ 85 __u8 x86_vendor; /* CPU vendor */ 86 __u8 x86_model; 87 __u8 x86_stepping; 88 #ifdef CONFIG_X86_64 89 /* Number of 4K pages in DTLB/ITLB combined(in pages): */ 90 int x86_tlbsize; 91 #endif 92 #ifdef CONFIG_X86_VMX_FEATURE_NAMES 93 __u32 vmx_capability[NVMXINTS]; 94 #endif 95 __u8 x86_virt_bits; 96 __u8 x86_phys_bits; 97 /* CPUID returned core id bits: */ 98 __u8 x86_coreid_bits; 99 __u8 cu_id; 100 /* Max extended CPUID function supported: */ 101 __u32 extended_cpuid_level; 102 /* Maximum supported CPUID level, -1=no CPUID: */ 103 int cpuid_level; 104 /* 105 * Align to size of unsigned long because the x86_capability array 106 * is passed to bitops which require the alignment. Use unnamed 107 * union to enforce the array is aligned to size of unsigned long. 108 */ 109 union { 110 __u32 x86_capability[NCAPINTS + NBUGINTS]; 111 unsigned long x86_capability_alignment; 112 }; 113 char x86_vendor_id[16]; 114 char x86_model_id[64]; 115 /* in KB - valid for CPUS which support this call: */ 116 unsigned int x86_cache_size; 117 int x86_cache_alignment; /* In bytes */ 118 /* Cache QoS architectural values, valid only on the BSP: */ 119 int x86_cache_max_rmid; /* max index */ 120 int x86_cache_occ_scale; /* scale to bytes */ 121 int x86_cache_mbm_width_offset; 122 int x86_power; 123 unsigned long loops_per_jiffy; 124 /* protected processor identification number */ 125 u64 ppin; 126 /* cpuid returned max cores value: */ 127 u16 x86_max_cores; 128 u16 apicid; 129 u16 initial_apicid; 130 u16 x86_clflush_size; 131 /* number of cores as seen by the OS: */ 132 u16 booted_cores; 133 /* Physical processor id: */ 134 u16 phys_proc_id; 135 /* Logical processor id: */ 136 u16 logical_proc_id; 137 /* Core id: */ 138 u16 cpu_core_id; 139 u16 cpu_die_id; 140 u16 logical_die_id; 141 /* Index into per_cpu list: */ 142 u16 cpu_index; 143 /* Is SMT active on this core? */ 144 bool smt_active; 145 u32 microcode; 146 /* Address space bits used by the cache internally */ 147 u8 x86_cache_bits; 148 unsigned initialized : 1; 149 } __randomize_layout; 150 151 #define X86_VENDOR_INTEL 0 152 #define X86_VENDOR_CYRIX 1 153 #define X86_VENDOR_AMD 2 154 #define X86_VENDOR_UMC 3 155 #define X86_VENDOR_CENTAUR 5 156 #define X86_VENDOR_TRANSMETA 7 157 #define X86_VENDOR_NSC 8 158 #define X86_VENDOR_HYGON 9 159 #define X86_VENDOR_ZHAOXIN 10 160 #define X86_VENDOR_VORTEX 11 161 #define X86_VENDOR_NUM 12 162 163 #define X86_VENDOR_UNKNOWN 0xff 164 165 /* 166 * capabilities of CPUs 167 */ 168 extern struct cpuinfo_x86 boot_cpu_data; 169 extern struct cpuinfo_x86 new_cpu_data; 170 171 extern __u32 cpu_caps_cleared[NCAPINTS + NBUGINTS]; 172 extern __u32 cpu_caps_set[NCAPINTS + NBUGINTS]; 173 174 #ifdef CONFIG_SMP 175 DECLARE_PER_CPU_READ_MOSTLY(struct cpuinfo_x86, cpu_info); 176 #define cpu_data(cpu) per_cpu(cpu_info, cpu) 177 #else 178 #define cpu_info boot_cpu_data 179 #define cpu_data(cpu) boot_cpu_data 180 #endif 181 182 extern const struct seq_operations cpuinfo_op; 183 184 #define cache_line_size() (boot_cpu_data.x86_cache_alignment) 185 186 extern void cpu_detect(struct cpuinfo_x86 *c); 187 188 static inline unsigned long long l1tf_pfn_limit(void) 189 { 190 return BIT_ULL(boot_cpu_data.x86_cache_bits - 1 - PAGE_SHIFT); 191 } 192 193 extern void early_cpu_init(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 *); 197 198 /* 199 * Friendlier CR3 helpers. 200 */ 201 static inline unsigned long read_cr3_pa(void) 202 { 203 return __read_cr3() & CR3_ADDR_MASK; 204 } 205 206 static inline unsigned long native_read_cr3_pa(void) 207 { 208 return __native_read_cr3() & CR3_ADDR_MASK; 209 } 210 211 static inline void load_cr3(pgd_t *pgdir) 212 { 213 write_cr3(__sme_pa(pgdir)); 214 } 215 216 /* 217 * Note that while the legacy 'TSS' name comes from 'Task State Segment', 218 * on modern x86 CPUs the TSS also holds information important to 64-bit mode, 219 * unrelated to the task-switch mechanism: 220 */ 221 #ifdef CONFIG_X86_32 222 /* This is the TSS defined by the hardware. */ 223 struct x86_hw_tss { 224 unsigned short back_link, __blh; 225 unsigned long sp0; 226 unsigned short ss0, __ss0h; 227 unsigned long sp1; 228 229 /* 230 * We don't use ring 1, so ss1 is a convenient scratch space in 231 * the same cacheline as sp0. We use ss1 to cache the value in 232 * MSR_IA32_SYSENTER_CS. When we context switch 233 * MSR_IA32_SYSENTER_CS, we first check if the new value being 234 * written matches ss1, and, if it's not, then we wrmsr the new 235 * value and update ss1. 236 * 237 * The only reason we context switch MSR_IA32_SYSENTER_CS is 238 * that we set it to zero in vm86 tasks to avoid corrupting the 239 * stack if we were to go through the sysenter path from vm86 240 * mode. 241 */ 242 unsigned short ss1; /* MSR_IA32_SYSENTER_CS */ 243 244 unsigned short __ss1h; 245 unsigned long sp2; 246 unsigned short ss2, __ss2h; 247 unsigned long __cr3; 248 unsigned long ip; 249 unsigned long flags; 250 unsigned long ax; 251 unsigned long cx; 252 unsigned long dx; 253 unsigned long bx; 254 unsigned long sp; 255 unsigned long bp; 256 unsigned long si; 257 unsigned long di; 258 unsigned short es, __esh; 259 unsigned short cs, __csh; 260 unsigned short ss, __ssh; 261 unsigned short ds, __dsh; 262 unsigned short fs, __fsh; 263 unsigned short gs, __gsh; 264 unsigned short ldt, __ldth; 265 unsigned short trace; 266 unsigned short io_bitmap_base; 267 268 } __attribute__((packed)); 269 #else 270 struct x86_hw_tss { 271 u32 reserved1; 272 u64 sp0; 273 u64 sp1; 274 275 /* 276 * Since Linux does not use ring 2, the 'sp2' slot is unused by 277 * hardware. entry_SYSCALL_64 uses it as scratch space to stash 278 * the user RSP value. 279 */ 280 u64 sp2; 281 282 u64 reserved2; 283 u64 ist[7]; 284 u32 reserved3; 285 u32 reserved4; 286 u16 reserved5; 287 u16 io_bitmap_base; 288 289 } __attribute__((packed)); 290 #endif 291 292 /* 293 * IO-bitmap sizes: 294 */ 295 #define IO_BITMAP_BITS 65536 296 #define IO_BITMAP_BYTES (IO_BITMAP_BITS / BITS_PER_BYTE) 297 #define IO_BITMAP_LONGS (IO_BITMAP_BYTES / sizeof(long)) 298 299 #define IO_BITMAP_OFFSET_VALID_MAP \ 300 (offsetof(struct tss_struct, io_bitmap.bitmap) - \ 301 offsetof(struct tss_struct, x86_tss)) 302 303 #define IO_BITMAP_OFFSET_VALID_ALL \ 304 (offsetof(struct tss_struct, io_bitmap.mapall) - \ 305 offsetof(struct tss_struct, x86_tss)) 306 307 #ifdef CONFIG_X86_IOPL_IOPERM 308 /* 309 * sizeof(unsigned long) coming from an extra "long" at the end of the 310 * iobitmap. The limit is inclusive, i.e. the last valid byte. 311 */ 312 # define __KERNEL_TSS_LIMIT \ 313 (IO_BITMAP_OFFSET_VALID_ALL + IO_BITMAP_BYTES + \ 314 sizeof(unsigned long) - 1) 315 #else 316 # define __KERNEL_TSS_LIMIT \ 317 (offsetof(struct tss_struct, x86_tss) + sizeof(struct x86_hw_tss) - 1) 318 #endif 319 320 /* Base offset outside of TSS_LIMIT so unpriviledged IO causes #GP */ 321 #define IO_BITMAP_OFFSET_INVALID (__KERNEL_TSS_LIMIT + 1) 322 323 struct entry_stack { 324 char stack[PAGE_SIZE]; 325 }; 326 327 struct entry_stack_page { 328 struct entry_stack stack; 329 } __aligned(PAGE_SIZE); 330 331 /* 332 * All IO bitmap related data stored in the TSS: 333 */ 334 struct x86_io_bitmap { 335 /* The sequence number of the last active bitmap. */ 336 u64 prev_sequence; 337 338 /* 339 * Store the dirty size of the last io bitmap offender. The next 340 * one will have to do the cleanup as the switch out to a non io 341 * bitmap user will just set x86_tss.io_bitmap_base to a value 342 * outside of the TSS limit. So for sane tasks there is no need to 343 * actually touch the io_bitmap at all. 344 */ 345 unsigned int prev_max; 346 347 /* 348 * The extra 1 is there because the CPU will access an 349 * additional byte beyond the end of the IO permission 350 * bitmap. The extra byte must be all 1 bits, and must 351 * be within the limit. 352 */ 353 unsigned long bitmap[IO_BITMAP_LONGS + 1]; 354 355 /* 356 * Special I/O bitmap to emulate IOPL(3). All bytes zero, 357 * except the additional byte at the end. 358 */ 359 unsigned long mapall[IO_BITMAP_LONGS + 1]; 360 }; 361 362 struct tss_struct { 363 /* 364 * The fixed hardware portion. This must not cross a page boundary 365 * at risk of violating the SDM's advice and potentially triggering 366 * errata. 367 */ 368 struct x86_hw_tss x86_tss; 369 370 struct x86_io_bitmap io_bitmap; 371 } __aligned(PAGE_SIZE); 372 373 DECLARE_PER_CPU_PAGE_ALIGNED(struct tss_struct, cpu_tss_rw); 374 375 /* Per CPU interrupt stacks */ 376 struct irq_stack { 377 char stack[IRQ_STACK_SIZE]; 378 } __aligned(IRQ_STACK_SIZE); 379 380 #ifdef CONFIG_X86_64 381 struct fixed_percpu_data { 382 /* 383 * GCC hardcodes the stack canary as %gs:40. Since the 384 * irq_stack is the object at %gs:0, we reserve the bottom 385 * 48 bytes of the irq stack for the canary. 386 * 387 * Once we are willing to require -mstack-protector-guard-symbol= 388 * support for x86_64 stackprotector, we can get rid of this. 389 */ 390 char gs_base[40]; 391 unsigned long stack_canary; 392 }; 393 394 DECLARE_PER_CPU_FIRST(struct fixed_percpu_data, fixed_percpu_data) __visible; 395 DECLARE_INIT_PER_CPU(fixed_percpu_data); 396 397 static inline unsigned long cpu_kernelmode_gs_base(int cpu) 398 { 399 return (unsigned long)per_cpu(fixed_percpu_data.gs_base, cpu); 400 } 401 402 extern asmlinkage void ignore_sysret(void); 403 404 /* Save actual FS/GS selectors and bases to current->thread */ 405 void current_save_fsgs(void); 406 #else /* X86_64 */ 407 #ifdef CONFIG_STACKPROTECTOR 408 DECLARE_PER_CPU(unsigned long, __stack_chk_guard); 409 #endif 410 #endif /* !X86_64 */ 411 412 struct perf_event; 413 414 struct thread_struct { 415 /* Cached TLS descriptors: */ 416 struct desc_struct tls_array[GDT_ENTRY_TLS_ENTRIES]; 417 #ifdef CONFIG_X86_32 418 unsigned long sp0; 419 #endif 420 unsigned long sp; 421 #ifdef CONFIG_X86_32 422 unsigned long sysenter_cs; 423 #else 424 unsigned short es; 425 unsigned short ds; 426 unsigned short fsindex; 427 unsigned short gsindex; 428 #endif 429 430 #ifdef CONFIG_X86_64 431 unsigned long fsbase; 432 unsigned long gsbase; 433 #else 434 /* 435 * XXX: this could presumably be unsigned short. Alternatively, 436 * 32-bit kernels could be taught to use fsindex instead. 437 */ 438 unsigned long fs; 439 unsigned long gs; 440 #endif 441 442 /* Save middle states of ptrace breakpoints */ 443 struct perf_event *ptrace_bps[HBP_NUM]; 444 /* Debug status used for traps, single steps, etc... */ 445 unsigned long virtual_dr6; 446 /* Keep track of the exact dr7 value set by the user */ 447 unsigned long ptrace_dr7; 448 /* Fault info: */ 449 unsigned long cr2; 450 unsigned long trap_nr; 451 unsigned long error_code; 452 #ifdef CONFIG_VM86 453 /* Virtual 86 mode info */ 454 struct vm86 *vm86; 455 #endif 456 /* IO permissions: */ 457 struct io_bitmap *io_bitmap; 458 459 /* 460 * IOPL. Privilege level dependent I/O permission which is 461 * emulated via the I/O bitmap to prevent user space from disabling 462 * interrupts. 463 */ 464 unsigned long iopl_emul; 465 466 unsigned int iopl_warn:1; 467 468 /* 469 * Protection Keys Register for Userspace. Loaded immediately on 470 * context switch. Store it in thread_struct to avoid a lookup in 471 * the tasks's FPU xstate buffer. This value is only valid when a 472 * task is scheduled out. For 'current' the authoritative source of 473 * PKRU is the hardware itself. 474 */ 475 u32 pkru; 476 477 #ifdef CONFIG_X86_USER_SHADOW_STACK 478 unsigned long features; 479 unsigned long features_locked; 480 481 struct thread_shstk shstk; 482 #endif 483 484 /* Floating point and extended processor state */ 485 struct fpu fpu; 486 /* 487 * WARNING: 'fpu' is dynamically-sized. It *MUST* be at 488 * the end. 489 */ 490 }; 491 492 extern void fpu_thread_struct_whitelist(unsigned long *offset, unsigned long *size); 493 494 static inline void arch_thread_struct_whitelist(unsigned long *offset, 495 unsigned long *size) 496 { 497 fpu_thread_struct_whitelist(offset, size); 498 } 499 500 static inline void 501 native_load_sp0(unsigned long sp0) 502 { 503 this_cpu_write(cpu_tss_rw.x86_tss.sp0, sp0); 504 } 505 506 static __always_inline void native_swapgs(void) 507 { 508 #ifdef CONFIG_X86_64 509 asm volatile("swapgs" ::: "memory"); 510 #endif 511 } 512 513 static __always_inline unsigned long current_top_of_stack(void) 514 { 515 /* 516 * We can't read directly from tss.sp0: sp0 on x86_32 is special in 517 * and around vm86 mode and sp0 on x86_64 is special because of the 518 * entry trampoline. 519 */ 520 return this_cpu_read_stable(pcpu_hot.top_of_stack); 521 } 522 523 static __always_inline bool on_thread_stack(void) 524 { 525 return (unsigned long)(current_top_of_stack() - 526 current_stack_pointer) < THREAD_SIZE; 527 } 528 529 #ifdef CONFIG_PARAVIRT_XXL 530 #include <asm/paravirt.h> 531 #else 532 533 static inline void load_sp0(unsigned long sp0) 534 { 535 native_load_sp0(sp0); 536 } 537 538 #endif /* CONFIG_PARAVIRT_XXL */ 539 540 unsigned long __get_wchan(struct task_struct *p); 541 542 extern void select_idle_routine(const struct cpuinfo_x86 *c); 543 extern void amd_e400_c1e_apic_setup(void); 544 545 extern unsigned long boot_option_idle_override; 546 547 enum idle_boot_override {IDLE_NO_OVERRIDE=0, IDLE_HALT, IDLE_NOMWAIT, 548 IDLE_POLL}; 549 550 extern void enable_sep_cpu(void); 551 552 553 /* Defined in head.S */ 554 extern struct desc_ptr early_gdt_descr; 555 556 extern void switch_gdt_and_percpu_base(int); 557 extern void load_direct_gdt(int); 558 extern void load_fixmap_gdt(int); 559 extern void cpu_init(void); 560 extern void cpu_init_exception_handling(void); 561 extern void cr4_init(void); 562 563 static inline unsigned long get_debugctlmsr(void) 564 { 565 unsigned long debugctlmsr = 0; 566 567 #ifndef CONFIG_X86_DEBUGCTLMSR 568 if (boot_cpu_data.x86 < 6) 569 return 0; 570 #endif 571 rdmsrl(MSR_IA32_DEBUGCTLMSR, debugctlmsr); 572 573 return debugctlmsr; 574 } 575 576 static inline void update_debugctlmsr(unsigned long debugctlmsr) 577 { 578 #ifndef CONFIG_X86_DEBUGCTLMSR 579 if (boot_cpu_data.x86 < 6) 580 return; 581 #endif 582 wrmsrl(MSR_IA32_DEBUGCTLMSR, debugctlmsr); 583 } 584 585 extern void set_task_blockstep(struct task_struct *task, bool on); 586 587 /* Boot loader type from the setup header: */ 588 extern int bootloader_type; 589 extern int bootloader_version; 590 591 extern char ignore_fpu_irq; 592 593 #define HAVE_ARCH_PICK_MMAP_LAYOUT 1 594 #define ARCH_HAS_PREFETCHW 595 596 #ifdef CONFIG_X86_32 597 # define BASE_PREFETCH "" 598 # define ARCH_HAS_PREFETCH 599 #else 600 # define BASE_PREFETCH "prefetcht0 %P1" 601 #endif 602 603 /* 604 * Prefetch instructions for Pentium III (+) and AMD Athlon (+) 605 * 606 * It's not worth to care about 3dnow prefetches for the K6 607 * because they are microcoded there and very slow. 608 */ 609 static inline void prefetch(const void *x) 610 { 611 alternative_input(BASE_PREFETCH, "prefetchnta %P1", 612 X86_FEATURE_XMM, 613 "m" (*(const char *)x)); 614 } 615 616 /* 617 * 3dnow prefetch to get an exclusive cache line. 618 * Useful for spinlocks to avoid one state transition in the 619 * cache coherency protocol: 620 */ 621 static __always_inline void prefetchw(const void *x) 622 { 623 alternative_input(BASE_PREFETCH, "prefetchw %P1", 624 X86_FEATURE_3DNOWPREFETCH, 625 "m" (*(const char *)x)); 626 } 627 628 #define TOP_OF_INIT_STACK ((unsigned long)&init_stack + sizeof(init_stack) - \ 629 TOP_OF_KERNEL_STACK_PADDING) 630 631 #define task_top_of_stack(task) ((unsigned long)(task_pt_regs(task) + 1)) 632 633 #define task_pt_regs(task) \ 634 ({ \ 635 unsigned long __ptr = (unsigned long)task_stack_page(task); \ 636 __ptr += THREAD_SIZE - TOP_OF_KERNEL_STACK_PADDING; \ 637 ((struct pt_regs *)__ptr) - 1; \ 638 }) 639 640 #ifdef CONFIG_X86_32 641 #define INIT_THREAD { \ 642 .sp0 = TOP_OF_INIT_STACK, \ 643 .sysenter_cs = __KERNEL_CS, \ 644 } 645 646 #define KSTK_ESP(task) (task_pt_regs(task)->sp) 647 648 #else 649 extern unsigned long __end_init_task[]; 650 651 #define INIT_THREAD { \ 652 .sp = (unsigned long)&__end_init_task - sizeof(struct pt_regs), \ 653 } 654 655 extern unsigned long KSTK_ESP(struct task_struct *task); 656 657 #endif /* CONFIG_X86_64 */ 658 659 extern void start_thread(struct pt_regs *regs, unsigned long new_ip, 660 unsigned long new_sp); 661 662 /* 663 * This decides where the kernel will search for a free chunk of vm 664 * space during mmap's. 665 */ 666 #define __TASK_UNMAPPED_BASE(task_size) (PAGE_ALIGN(task_size / 3)) 667 #define TASK_UNMAPPED_BASE __TASK_UNMAPPED_BASE(TASK_SIZE_LOW) 668 669 #define KSTK_EIP(task) (task_pt_regs(task)->ip) 670 671 /* Get/set a process' ability to use the timestamp counter instruction */ 672 #define GET_TSC_CTL(adr) get_tsc_mode((adr)) 673 #define SET_TSC_CTL(val) set_tsc_mode((val)) 674 675 extern int get_tsc_mode(unsigned long adr); 676 extern int set_tsc_mode(unsigned int val); 677 678 DECLARE_PER_CPU(u64, msr_misc_features_shadow); 679 680 extern u16 get_llc_id(unsigned int cpu); 681 682 #ifdef CONFIG_CPU_SUP_AMD 683 extern u32 amd_get_nodes_per_socket(void); 684 extern u32 amd_get_highest_perf(void); 685 extern void amd_clear_divider(void); 686 extern void amd_check_microcode(void); 687 #else 688 static inline u32 amd_get_nodes_per_socket(void) { return 0; } 689 static inline u32 amd_get_highest_perf(void) { return 0; } 690 static inline void amd_clear_divider(void) { } 691 static inline void amd_check_microcode(void) { } 692 #endif 693 694 extern unsigned long arch_align_stack(unsigned long sp); 695 void free_init_pages(const char *what, unsigned long begin, unsigned long end); 696 extern void free_kernel_image_pages(const char *what, void *begin, void *end); 697 698 void default_idle(void); 699 #ifdef CONFIG_XEN 700 bool xen_set_default_idle(void); 701 #else 702 #define xen_set_default_idle 0 703 #endif 704 705 void __noreturn stop_this_cpu(void *dummy); 706 void microcode_check(struct cpuinfo_x86 *prev_info); 707 void store_cpu_caps(struct cpuinfo_x86 *info); 708 709 enum l1tf_mitigations { 710 L1TF_MITIGATION_OFF, 711 L1TF_MITIGATION_FLUSH_NOWARN, 712 L1TF_MITIGATION_FLUSH, 713 L1TF_MITIGATION_FLUSH_NOSMT, 714 L1TF_MITIGATION_FULL, 715 L1TF_MITIGATION_FULL_FORCE 716 }; 717 718 extern enum l1tf_mitigations l1tf_mitigation; 719 720 enum mds_mitigations { 721 MDS_MITIGATION_OFF, 722 MDS_MITIGATION_FULL, 723 MDS_MITIGATION_VMWERV, 724 }; 725 726 #ifdef CONFIG_X86_SGX 727 int arch_memory_failure(unsigned long pfn, int flags); 728 #define arch_memory_failure arch_memory_failure 729 730 bool arch_is_platform_page(u64 paddr); 731 #define arch_is_platform_page arch_is_platform_page 732 #endif 733 734 extern bool gds_ucode_mitigated(void); 735 736 /* 737 * Make previous memory operations globally visible before 738 * a WRMSR. 739 * 740 * MFENCE makes writes visible, but only affects load/store 741 * instructions. WRMSR is unfortunately not a load/store 742 * instruction and is unaffected by MFENCE. The LFENCE ensures 743 * that the WRMSR is not reordered. 744 * 745 * Most WRMSRs are full serializing instructions themselves and 746 * do not require this barrier. This is only required for the 747 * IA32_TSC_DEADLINE and X2APIC MSRs. 748 */ 749 static inline void weak_wrmsr_fence(void) 750 { 751 alternative("mfence; lfence", "", ALT_NOT(X86_FEATURE_APIC_MSRS_FENCE)); 752 } 753 754 #endif /* _ASM_X86_PROCESSOR_H */ 755