1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1993 The Regents of the University of California. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * $FreeBSD$ 32 */ 33 34 /* 35 * Functions to provide access to special i386 instructions. 36 * This in included in sys/systm.h, and that file should be 37 * used in preference to this. 38 */ 39 40 #ifndef _MACHINE_CPUFUNC_H_ 41 #define _MACHINE_CPUFUNC_H_ 42 43 #ifndef _SYS_CDEFS_H_ 44 #error this file needs sys/cdefs.h as a prerequisite 45 #endif 46 47 struct region_descriptor; 48 49 #define readb(va) (*(volatile uint8_t *) (va)) 50 #define readw(va) (*(volatile uint16_t *) (va)) 51 #define readl(va) (*(volatile uint32_t *) (va)) 52 53 #define writeb(va, d) (*(volatile uint8_t *) (va) = (d)) 54 #define writew(va, d) (*(volatile uint16_t *) (va) = (d)) 55 #define writel(va, d) (*(volatile uint32_t *) (va) = (d)) 56 57 #if defined(__GNUCLIKE_ASM) && defined(__CC_SUPPORTS___INLINE) 58 59 static __inline void 60 breakpoint(void) 61 { 62 __asm __volatile("int $3"); 63 } 64 65 static __inline __pure2 u_int 66 bsfl(u_int mask) 67 { 68 u_int result; 69 70 __asm("bsfl %1,%0" : "=r" (result) : "rm" (mask) : "cc"); 71 return (result); 72 } 73 74 static __inline __pure2 u_int 75 bsrl(u_int mask) 76 { 77 u_int result; 78 79 __asm("bsrl %1,%0" : "=r" (result) : "rm" (mask) : "cc"); 80 return (result); 81 } 82 83 static __inline void 84 clflush(u_long addr) 85 { 86 87 __asm __volatile("clflush %0" : : "m" (*(char *)addr)); 88 } 89 90 static __inline void 91 clflushopt(u_long addr) 92 { 93 94 __asm __volatile(".byte 0x66;clflush %0" : : "m" (*(char *)addr)); 95 } 96 97 static __inline void 98 clts(void) 99 { 100 101 __asm __volatile("clts"); 102 } 103 104 static __inline void 105 disable_intr(void) 106 { 107 108 __asm __volatile("cli" : : : "memory"); 109 } 110 111 #ifdef _KERNEL 112 static __inline void 113 do_cpuid(u_int ax, u_int *p) 114 { 115 __asm __volatile("cpuid" 116 : "=a" (p[0]), "=b" (p[1]), "=c" (p[2]), "=d" (p[3]) 117 : "0" (ax)); 118 } 119 120 static __inline void 121 cpuid_count(u_int ax, u_int cx, u_int *p) 122 { 123 __asm __volatile("cpuid" 124 : "=a" (p[0]), "=b" (p[1]), "=c" (p[2]), "=d" (p[3]) 125 : "0" (ax), "c" (cx)); 126 } 127 #else 128 static __inline void 129 do_cpuid(u_int ax, u_int *p) 130 { 131 __asm __volatile( 132 "pushl\t%%ebx\n\t" 133 "cpuid\n\t" 134 "movl\t%%ebx,%1\n\t" 135 "popl\t%%ebx" 136 : "=a" (p[0]), "=DS" (p[1]), "=c" (p[2]), "=d" (p[3]) 137 : "0" (ax)); 138 } 139 140 static __inline void 141 cpuid_count(u_int ax, u_int cx, u_int *p) 142 { 143 __asm __volatile( 144 "pushl\t%%ebx\n\t" 145 "cpuid\n\t" 146 "movl\t%%ebx,%1\n\t" 147 "popl\t%%ebx" 148 : "=a" (p[0]), "=DS" (p[1]), "=c" (p[2]), "=d" (p[3]) 149 : "0" (ax), "c" (cx)); 150 } 151 #endif 152 153 static __inline void 154 enable_intr(void) 155 { 156 157 __asm __volatile("sti"); 158 } 159 160 static __inline void 161 cpu_monitor(const void *addr, u_long extensions, u_int hints) 162 { 163 164 __asm __volatile("monitor" 165 : : "a" (addr), "c" (extensions), "d" (hints)); 166 } 167 168 static __inline void 169 cpu_mwait(u_long extensions, u_int hints) 170 { 171 172 __asm __volatile("mwait" : : "a" (hints), "c" (extensions)); 173 } 174 175 static __inline void 176 lfence(void) 177 { 178 179 __asm __volatile("lfence" : : : "memory"); 180 } 181 182 static __inline void 183 mfence(void) 184 { 185 186 __asm __volatile("mfence" : : : "memory"); 187 } 188 189 static __inline void 190 sfence(void) 191 { 192 193 __asm __volatile("sfence" : : : "memory"); 194 } 195 196 #ifdef _KERNEL 197 198 #define HAVE_INLINE_FFS 199 200 static __inline __pure2 int 201 ffs(int mask) 202 { 203 /* 204 * Note that gcc-2's builtin ffs would be used if we didn't declare 205 * this inline or turn off the builtin. The builtin is faster but 206 * broken in gcc-2.4.5 and slower but working in gcc-2.5 and later 207 * versions. 208 */ 209 return (mask == 0 ? mask : (int)bsfl((u_int)mask) + 1); 210 } 211 212 #define HAVE_INLINE_FFSL 213 214 static __inline __pure2 int 215 ffsl(long mask) 216 { 217 return (ffs((int)mask)); 218 } 219 220 #define HAVE_INLINE_FLS 221 222 static __inline __pure2 int 223 fls(int mask) 224 { 225 return (mask == 0 ? mask : (int)bsrl((u_int)mask) + 1); 226 } 227 228 #define HAVE_INLINE_FLSL 229 230 static __inline __pure2 int 231 flsl(long mask) 232 { 233 return (fls((int)mask)); 234 } 235 236 #endif /* _KERNEL */ 237 238 static __inline void 239 halt(void) 240 { 241 __asm __volatile("hlt"); 242 } 243 244 static __inline u_char 245 inb(u_int port) 246 { 247 u_char data; 248 249 __asm __volatile("inb %w1, %0" : "=a" (data) : "Nd" (port)); 250 return (data); 251 } 252 253 static __inline u_int 254 inl(u_int port) 255 { 256 u_int data; 257 258 __asm __volatile("inl %w1, %0" : "=a" (data) : "Nd" (port)); 259 return (data); 260 } 261 262 static __inline void 263 insb(u_int port, void *addr, size_t count) 264 { 265 __asm __volatile("cld; rep; insb" 266 : "+D" (addr), "+c" (count) 267 : "d" (port) 268 : "memory"); 269 } 270 271 static __inline void 272 insw(u_int port, void *addr, size_t count) 273 { 274 __asm __volatile("cld; rep; insw" 275 : "+D" (addr), "+c" (count) 276 : "d" (port) 277 : "memory"); 278 } 279 280 static __inline void 281 insl(u_int port, void *addr, size_t count) 282 { 283 __asm __volatile("cld; rep; insl" 284 : "+D" (addr), "+c" (count) 285 : "d" (port) 286 : "memory"); 287 } 288 289 static __inline void 290 invd(void) 291 { 292 __asm __volatile("invd"); 293 } 294 295 static __inline u_short 296 inw(u_int port) 297 { 298 u_short data; 299 300 __asm __volatile("inw %w1, %0" : "=a" (data) : "Nd" (port)); 301 return (data); 302 } 303 304 static __inline void 305 outb(u_int port, u_char data) 306 { 307 __asm __volatile("outb %0, %w1" : : "a" (data), "Nd" (port)); 308 } 309 310 static __inline void 311 outl(u_int port, u_int data) 312 { 313 __asm __volatile("outl %0, %w1" : : "a" (data), "Nd" (port)); 314 } 315 316 static __inline void 317 outsb(u_int port, const void *addr, size_t count) 318 { 319 __asm __volatile("cld; rep; outsb" 320 : "+S" (addr), "+c" (count) 321 : "d" (port)); 322 } 323 324 static __inline void 325 outsw(u_int port, const void *addr, size_t count) 326 { 327 __asm __volatile("cld; rep; outsw" 328 : "+S" (addr), "+c" (count) 329 : "d" (port)); 330 } 331 332 static __inline void 333 outsl(u_int port, const void *addr, size_t count) 334 { 335 __asm __volatile("cld; rep; outsl" 336 : "+S" (addr), "+c" (count) 337 : "d" (port)); 338 } 339 340 static __inline void 341 outw(u_int port, u_short data) 342 { 343 __asm __volatile("outw %0, %w1" : : "a" (data), "Nd" (port)); 344 } 345 346 static __inline void 347 ia32_pause(void) 348 { 349 __asm __volatile("pause"); 350 } 351 352 static __inline u_int 353 read_eflags(void) 354 { 355 u_int ef; 356 357 __asm __volatile("pushfl; popl %0" : "=r" (ef)); 358 return (ef); 359 } 360 361 static __inline uint64_t 362 rdmsr(u_int msr) 363 { 364 uint64_t rv; 365 366 __asm __volatile("rdmsr" : "=A" (rv) : "c" (msr)); 367 return (rv); 368 } 369 370 static __inline uint32_t 371 rdmsr32(u_int msr) 372 { 373 uint32_t low; 374 375 __asm __volatile("rdmsr" : "=a" (low) : "c" (msr) : "edx"); 376 return (low); 377 } 378 379 static __inline uint64_t 380 rdpmc(u_int pmc) 381 { 382 uint64_t rv; 383 384 __asm __volatile("rdpmc" : "=A" (rv) : "c" (pmc)); 385 return (rv); 386 } 387 388 static __inline uint64_t 389 rdtsc(void) 390 { 391 uint64_t rv; 392 393 __asm __volatile("rdtsc" : "=A" (rv)); 394 return (rv); 395 } 396 397 static __inline uint64_t 398 rdtscp(void) 399 { 400 uint64_t rv; 401 402 __asm __volatile("rdtscp" : "=A" (rv) : : "ecx"); 403 return (rv); 404 } 405 406 static __inline uint32_t 407 rdtsc32(void) 408 { 409 uint32_t rv; 410 411 __asm __volatile("rdtsc" : "=a" (rv) : : "edx"); 412 return (rv); 413 } 414 415 static __inline uint32_t 416 rdtscp32(void) 417 { 418 uint32_t rv; 419 420 __asm __volatile("rdtscp" : "=a" (rv) : : "ecx", "edx"); 421 return (rv); 422 } 423 424 static __inline void 425 wbinvd(void) 426 { 427 __asm __volatile("wbinvd"); 428 } 429 430 static __inline void 431 write_eflags(u_int ef) 432 { 433 __asm __volatile("pushl %0; popfl" : : "r" (ef)); 434 } 435 436 static __inline void 437 wrmsr(u_int msr, uint64_t newval) 438 { 439 __asm __volatile("wrmsr" : : "A" (newval), "c" (msr)); 440 } 441 442 static __inline void 443 load_cr0(u_int data) 444 { 445 446 __asm __volatile("movl %0,%%cr0" : : "r" (data)); 447 } 448 449 static __inline u_int 450 rcr0(void) 451 { 452 u_int data; 453 454 __asm __volatile("movl %%cr0,%0" : "=r" (data)); 455 return (data); 456 } 457 458 static __inline u_int 459 rcr2(void) 460 { 461 u_int data; 462 463 __asm __volatile("movl %%cr2,%0" : "=r" (data)); 464 return (data); 465 } 466 467 static __inline void 468 load_cr3(u_int data) 469 { 470 471 __asm __volatile("movl %0,%%cr3" : : "r" (data) : "memory"); 472 } 473 474 static __inline u_int 475 rcr3(void) 476 { 477 u_int data; 478 479 __asm __volatile("movl %%cr3,%0" : "=r" (data)); 480 return (data); 481 } 482 483 static __inline void 484 load_cr4(u_int data) 485 { 486 __asm __volatile("movl %0,%%cr4" : : "r" (data)); 487 } 488 489 static __inline u_int 490 rcr4(void) 491 { 492 u_int data; 493 494 __asm __volatile("movl %%cr4,%0" : "=r" (data)); 495 return (data); 496 } 497 498 static __inline uint64_t 499 rxcr(u_int reg) 500 { 501 u_int low, high; 502 503 __asm __volatile("xgetbv" : "=a" (low), "=d" (high) : "c" (reg)); 504 return (low | ((uint64_t)high << 32)); 505 } 506 507 static __inline void 508 load_xcr(u_int reg, uint64_t val) 509 { 510 u_int low, high; 511 512 low = val; 513 high = val >> 32; 514 __asm __volatile("xsetbv" : : "c" (reg), "a" (low), "d" (high)); 515 } 516 517 /* 518 * Global TLB flush (except for thise for pages marked PG_G) 519 */ 520 static __inline void 521 invltlb(void) 522 { 523 524 load_cr3(rcr3()); 525 } 526 527 /* 528 * TLB flush for an individual page (even if it has PG_G). 529 * Only works on 486+ CPUs (i386 does not have PG_G). 530 */ 531 static __inline void 532 invlpg(u_int addr) 533 { 534 535 __asm __volatile("invlpg %0" : : "m" (*(char *)addr) : "memory"); 536 } 537 538 static __inline u_short 539 rfs(void) 540 { 541 u_short sel; 542 __asm __volatile("movw %%fs,%0" : "=rm" (sel)); 543 return (sel); 544 } 545 546 static __inline uint64_t 547 rgdt(void) 548 { 549 uint64_t gdtr; 550 __asm __volatile("sgdt %0" : "=m" (gdtr)); 551 return (gdtr); 552 } 553 554 static __inline u_short 555 rgs(void) 556 { 557 u_short sel; 558 __asm __volatile("movw %%gs,%0" : "=rm" (sel)); 559 return (sel); 560 } 561 562 static __inline uint64_t 563 ridt(void) 564 { 565 uint64_t idtr; 566 __asm __volatile("sidt %0" : "=m" (idtr)); 567 return (idtr); 568 } 569 570 static __inline u_short 571 rldt(void) 572 { 573 u_short ldtr; 574 __asm __volatile("sldt %0" : "=g" (ldtr)); 575 return (ldtr); 576 } 577 578 static __inline u_short 579 rss(void) 580 { 581 u_short sel; 582 __asm __volatile("movw %%ss,%0" : "=rm" (sel)); 583 return (sel); 584 } 585 586 static __inline u_short 587 rtr(void) 588 { 589 u_short tr; 590 __asm __volatile("str %0" : "=g" (tr)); 591 return (tr); 592 } 593 594 static __inline void 595 load_fs(u_short sel) 596 { 597 __asm __volatile("movw %0,%%fs" : : "rm" (sel)); 598 } 599 600 static __inline void 601 load_gs(u_short sel) 602 { 603 __asm __volatile("movw %0,%%gs" : : "rm" (sel)); 604 } 605 606 static __inline void 607 lidt(struct region_descriptor *addr) 608 { 609 __asm __volatile("lidt (%0)" : : "r" (addr)); 610 } 611 612 static __inline void 613 lldt(u_short sel) 614 { 615 __asm __volatile("lldt %0" : : "r" (sel)); 616 } 617 618 static __inline void 619 ltr(u_short sel) 620 { 621 __asm __volatile("ltr %0" : : "r" (sel)); 622 } 623 624 static __inline u_int 625 rdr0(void) 626 { 627 u_int data; 628 __asm __volatile("movl %%dr0,%0" : "=r" (data)); 629 return (data); 630 } 631 632 static __inline void 633 load_dr0(u_int dr0) 634 { 635 __asm __volatile("movl %0,%%dr0" : : "r" (dr0)); 636 } 637 638 static __inline u_int 639 rdr1(void) 640 { 641 u_int data; 642 __asm __volatile("movl %%dr1,%0" : "=r" (data)); 643 return (data); 644 } 645 646 static __inline void 647 load_dr1(u_int dr1) 648 { 649 __asm __volatile("movl %0,%%dr1" : : "r" (dr1)); 650 } 651 652 static __inline u_int 653 rdr2(void) 654 { 655 u_int data; 656 __asm __volatile("movl %%dr2,%0" : "=r" (data)); 657 return (data); 658 } 659 660 static __inline void 661 load_dr2(u_int dr2) 662 { 663 __asm __volatile("movl %0,%%dr2" : : "r" (dr2)); 664 } 665 666 static __inline u_int 667 rdr3(void) 668 { 669 u_int data; 670 __asm __volatile("movl %%dr3,%0" : "=r" (data)); 671 return (data); 672 } 673 674 static __inline void 675 load_dr3(u_int dr3) 676 { 677 __asm __volatile("movl %0,%%dr3" : : "r" (dr3)); 678 } 679 680 static __inline u_int 681 rdr6(void) 682 { 683 u_int data; 684 __asm __volatile("movl %%dr6,%0" : "=r" (data)); 685 return (data); 686 } 687 688 static __inline void 689 load_dr6(u_int dr6) 690 { 691 __asm __volatile("movl %0,%%dr6" : : "r" (dr6)); 692 } 693 694 static __inline u_int 695 rdr7(void) 696 { 697 u_int data; 698 __asm __volatile("movl %%dr7,%0" : "=r" (data)); 699 return (data); 700 } 701 702 static __inline void 703 load_dr7(u_int dr7) 704 { 705 __asm __volatile("movl %0,%%dr7" : : "r" (dr7)); 706 } 707 708 static __inline u_char 709 read_cyrix_reg(u_char reg) 710 { 711 outb(0x22, reg); 712 return inb(0x23); 713 } 714 715 static __inline void 716 write_cyrix_reg(u_char reg, u_char data) 717 { 718 outb(0x22, reg); 719 outb(0x23, data); 720 } 721 722 static __inline register_t 723 intr_disable(void) 724 { 725 register_t eflags; 726 727 eflags = read_eflags(); 728 disable_intr(); 729 return (eflags); 730 } 731 732 static __inline void 733 intr_restore(register_t eflags) 734 { 735 write_eflags(eflags); 736 } 737 738 static __inline uint32_t 739 rdpkru(void) 740 { 741 uint32_t res; 742 743 __asm __volatile("rdpkru" : "=a" (res) : "c" (0) : "edx"); 744 return (res); 745 } 746 747 static __inline void 748 wrpkru(uint32_t mask) 749 { 750 751 __asm __volatile("wrpkru" : : "a" (mask), "c" (0), "d" (0)); 752 } 753 754 #else /* !(__GNUCLIKE_ASM && __CC_SUPPORTS___INLINE) */ 755 756 int breakpoint(void); 757 u_int bsfl(u_int mask); 758 u_int bsrl(u_int mask); 759 void clflush(u_long addr); 760 void clts(void); 761 void cpuid_count(u_int ax, u_int cx, u_int *p); 762 void disable_intr(void); 763 void do_cpuid(u_int ax, u_int *p); 764 void enable_intr(void); 765 void halt(void); 766 void ia32_pause(void); 767 u_char inb(u_int port); 768 u_int inl(u_int port); 769 void insb(u_int port, void *addr, size_t count); 770 void insl(u_int port, void *addr, size_t count); 771 void insw(u_int port, void *addr, size_t count); 772 register_t intr_disable(void); 773 void intr_restore(register_t ef); 774 void invd(void); 775 void invlpg(u_int addr); 776 void invltlb(void); 777 u_short inw(u_int port); 778 void lidt(struct region_descriptor *addr); 779 void lldt(u_short sel); 780 void load_cr0(u_int cr0); 781 void load_cr3(u_int cr3); 782 void load_cr4(u_int cr4); 783 void load_dr0(u_int dr0); 784 void load_dr1(u_int dr1); 785 void load_dr2(u_int dr2); 786 void load_dr3(u_int dr3); 787 void load_dr6(u_int dr6); 788 void load_dr7(u_int dr7); 789 void load_fs(u_short sel); 790 void load_gs(u_short sel); 791 void ltr(u_short sel); 792 void outb(u_int port, u_char data); 793 void outl(u_int port, u_int data); 794 void outsb(u_int port, const void *addr, size_t count); 795 void outsl(u_int port, const void *addr, size_t count); 796 void outsw(u_int port, const void *addr, size_t count); 797 void outw(u_int port, u_short data); 798 u_int rcr0(void); 799 u_int rcr2(void); 800 u_int rcr3(void); 801 u_int rcr4(void); 802 uint64_t rdmsr(u_int msr); 803 uint64_t rdpmc(u_int pmc); 804 u_int rdr0(void); 805 u_int rdr1(void); 806 u_int rdr2(void); 807 u_int rdr3(void); 808 u_int rdr6(void); 809 u_int rdr7(void); 810 uint64_t rdtsc(void); 811 u_char read_cyrix_reg(u_char reg); 812 u_int read_eflags(void); 813 u_int rfs(void); 814 uint64_t rgdt(void); 815 u_int rgs(void); 816 uint64_t ridt(void); 817 u_short rldt(void); 818 u_short rtr(void); 819 void wbinvd(void); 820 void write_cyrix_reg(u_char reg, u_char data); 821 void write_eflags(u_int ef); 822 void wrmsr(u_int msr, uint64_t newval); 823 824 #endif /* __GNUCLIKE_ASM && __CC_SUPPORTS___INLINE */ 825 826 void reset_dbregs(void); 827 828 #ifdef _KERNEL 829 int rdmsr_safe(u_int msr, uint64_t *val); 830 int wrmsr_safe(u_int msr, uint64_t newval); 831 #endif 832 833 #endif /* !_MACHINE_CPUFUNC_H_ */ 834