Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/i386/i386/locore.s
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1 /*- 2 * Copyright (c) 1990 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * William Jolitz. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * from: @(#)locore.s 7.3 (Berkeley) 5/13/91 37 * $FreeBSD: releng/5.1/sys/i386/i386/locore.s 113040 2003-04-03 23:44:35Z jake $ 38 * 39 * originally from: locore.s, by William F. Jolitz 40 * 41 * Substantially rewritten by David Greenman, Rod Grimes, 42 * Bruce Evans, Wolfgang Solfrank, Poul-Henning Kamp 43 * and many others. 44 */ 45 46 #include "opt_bootp.h" 47 #include "opt_compat.h" 48 #include "opt_nfsroot.h" 49 50 #include <sys/syscall.h> 51 #include <sys/reboot.h> 52 53 #include <machine/asmacros.h> 54 #include <machine/cputypes.h> 55 #include <machine/psl.h> 56 #include <machine/pmap.h> 57 #include <machine/specialreg.h> 58 59 #include "assym.s" 60 61 /* 62 * XXX 63 * 64 * Note: This version greatly munged to avoid various assembler errors 65 * that may be fixed in newer versions of gas. Perhaps newer versions 66 * will have more pleasant appearance. 67 */ 68 69 /* 70 * PTmap is recursive pagemap at top of virtual address space. 71 * Within PTmap, the page directory can be found (third indirection). 72 */ 73 .globl PTmap,PTD,PTDpde 74 .set PTmap,(PTDPTDI << PDRSHIFT) 75 .set PTD,PTmap + (PTDPTDI * PAGE_SIZE) 76 .set PTDpde,PTD + (PTDPTDI * PDESIZE) 77 78 #ifdef SMP 79 /* 80 * Define layout of per-cpu address space. 81 * This is "constructed" in locore.s on the BSP and in mp_machdep.c 82 * for each AP. DO NOT REORDER THESE WITHOUT UPDATING THE REST! 83 */ 84 .globl SMP_prvspace, lapic 85 .set SMP_prvspace,(MPPTDI << PDRSHIFT) 86 .set lapic,SMP_prvspace + (NPTEPG-1) * PAGE_SIZE 87 #endif /* SMP */ 88 89 /* 90 * Compiled KERNBASE location 91 */ 92 .globl kernbase 93 .set kernbase,KERNBASE 94 95 /* 96 * Globals 97 */ 98 .data 99 ALIGN_DATA /* just to be sure */ 100 101 .globl HIDENAME(tmpstk) 102 .space 0x2000 /* space for tmpstk - temporary stack */ 103 HIDENAME(tmpstk): 104 105 .globl bootinfo 106 bootinfo: .space BOOTINFO_SIZE /* bootinfo that we can handle */ 107 108 .globl KERNend 109 KERNend: .long 0 /* phys addr end of kernel (just after bss) */ 110 physfree: .long 0 /* phys addr of next free page */ 111 112 #ifdef SMP 113 .globl cpu0prvpage 114 cpu0pp: .long 0 /* phys addr cpu0 private pg */ 115 cpu0prvpage: .long 0 /* relocated version */ 116 117 .globl SMPpt 118 SMPptpa: .long 0 /* phys addr SMP page table */ 119 SMPpt: .long 0 /* relocated version */ 120 #endif /* SMP */ 121 122 .globl IdlePTD 123 IdlePTD: .long 0 /* phys addr of kernel PTD */ 124 125 #ifdef PAE 126 .globl IdlePDPT 127 IdlePDPT: .long 0 /* phys addr of kernel PDPT */ 128 #endif 129 130 #ifdef SMP 131 .globl KPTphys 132 #endif 133 KPTphys: .long 0 /* phys addr of kernel page tables */ 134 135 .globl proc0uarea, proc0kstack 136 proc0uarea: .long 0 /* address of proc 0 uarea space */ 137 proc0kstack: .long 0 /* address of proc 0 kstack space */ 138 p0upa: .long 0 /* phys addr of proc0's UAREA */ 139 p0kpa: .long 0 /* phys addr of proc0's STACK */ 140 141 vm86phystk: .long 0 /* PA of vm86/bios stack */ 142 143 .globl vm86paddr, vm86pa 144 vm86paddr: .long 0 /* address of vm86 region */ 145 vm86pa: .long 0 /* phys addr of vm86 region */ 146 147 #ifdef PC98 148 .globl pc98_system_parameter 149 pc98_system_parameter: 150 .space 0x240 151 #endif 152 153 /********************************************************************** 154 * 155 * Some handy macros 156 * 157 */ 158 159 #define R(foo) ((foo)-KERNBASE) 160 161 #define ALLOCPAGES(foo) \ 162 movl R(physfree), %esi ; \ 163 movl $((foo)*PAGE_SIZE), %eax ; \ 164 addl %esi, %eax ; \ 165 movl %eax, R(physfree) ; \ 166 movl %esi, %edi ; \ 167 movl $((foo)*PAGE_SIZE),%ecx ; \ 168 xorl %eax,%eax ; \ 169 cld ; \ 170 rep ; \ 171 stosb 172 173 /* 174 * fillkpt 175 * eax = page frame address 176 * ebx = index into page table 177 * ecx = how many pages to map 178 * base = base address of page dir/table 179 * prot = protection bits 180 */ 181 #define fillkpt(base, prot) \ 182 shll $PTESHIFT,%ebx ; \ 183 addl base,%ebx ; \ 184 orl $PG_V,%eax ; \ 185 orl prot,%eax ; \ 186 1: movl %eax,(%ebx) ; \ 187 addl $PAGE_SIZE,%eax ; /* increment physical address */ \ 188 addl $PTESIZE,%ebx ; /* next pte */ \ 189 loop 1b 190 191 /* 192 * fillkptphys(prot) 193 * eax = physical address 194 * ecx = how many pages to map 195 * prot = protection bits 196 */ 197 #define fillkptphys(prot) \ 198 movl %eax, %ebx ; \ 199 shrl $PAGE_SHIFT, %ebx ; \ 200 fillkpt(R(KPTphys), prot) 201 202 .text 203 /********************************************************************** 204 * 205 * This is where the bootblocks start us, set the ball rolling... 206 * 207 */ 208 NON_GPROF_ENTRY(btext) 209 210 #ifdef PC98 211 /* save SYSTEM PARAMETER for resume (NS/T or other) */ 212 movl $0xa1400,%esi 213 movl $R(pc98_system_parameter),%edi 214 movl $0x0240,%ecx 215 cld 216 rep 217 movsb 218 #else /* IBM-PC */ 219 /* Tell the bios to warmboot next time */ 220 movw $0x1234,0x472 221 #endif /* PC98 */ 222 223 /* Set up a real frame in case the double return in newboot is executed. */ 224 pushl %ebp 225 movl %esp, %ebp 226 227 /* Don't trust what the BIOS gives for eflags. */ 228 pushl $PSL_KERNEL 229 popfl 230 231 /* 232 * Don't trust what the BIOS gives for %fs and %gs. Trust the bootstrap 233 * to set %cs, %ds, %es and %ss. 234 */ 235 mov %ds, %ax 236 mov %ax, %fs 237 mov %ax, %gs 238 239 call recover_bootinfo 240 241 /* Get onto a stack that we can trust. */ 242 /* 243 * XXX this step is delayed in case recover_bootinfo needs to return via 244 * the old stack, but it need not be, since recover_bootinfo actually 245 * returns via the old frame. 246 */ 247 movl $R(HIDENAME(tmpstk)),%esp 248 249 #ifdef PC98 250 /* pc98_machine_type & M_EPSON_PC98 */ 251 testb $0x02,R(pc98_system_parameter)+220 252 jz 3f 253 /* epson_machine_id <= 0x0b */ 254 cmpb $0x0b,R(pc98_system_parameter)+224 255 ja 3f 256 257 /* count up memory */ 258 movl $0x100000,%eax /* next, talley remaining memory */ 259 movl $0xFFF-0x100,%ecx 260 1: movl 0(%eax),%ebx /* save location to check */ 261 movl $0xa55a5aa5,0(%eax) /* write test pattern */ 262 cmpl $0xa55a5aa5,0(%eax) /* does not check yet for rollover */ 263 jne 2f 264 movl %ebx,0(%eax) /* restore memory */ 265 addl $PAGE_SIZE,%eax 266 loop 1b 267 2: subl $0x100000,%eax 268 shrl $17,%eax 269 movb %al,R(pc98_system_parameter)+1 270 3: 271 272 movw R(pc98_system_parameter+0x86),%ax 273 movw %ax,R(cpu_id) 274 #endif 275 276 call identify_cpu 277 278 /* clear bss */ 279 /* 280 * XXX this should be done a little earlier. 281 * 282 * XXX we don't check that there is memory for our bss and page tables 283 * before using it. 284 * 285 * XXX the boot program somewhat bogusly clears the bss. We still have 286 * to do it in case we were unzipped by kzipboot. Then the boot program 287 * only clears kzipboot's bss. 288 * 289 * XXX the gdt and idt are still somewhere in the boot program. We 290 * depend on the convention that the boot program is below 1MB and we 291 * are above 1MB to keep the gdt and idt away from the bss and page 292 * tables. 293 */ 294 movl $R(end),%ecx 295 movl $R(edata),%edi 296 subl %edi,%ecx 297 xorl %eax,%eax 298 cld 299 rep 300 stosb 301 302 call create_pagetables 303 304 /* 305 * If the CPU has support for VME, turn it on. 306 */ 307 testl $CPUID_VME, R(cpu_feature) 308 jz 1f 309 movl %cr4, %eax 310 orl $CR4_VME, %eax 311 movl %eax, %cr4 312 1: 313 314 /* Now enable paging */ 315 #ifdef PAE 316 movl R(IdlePDPT), %eax 317 movl %eax, %cr3 318 movl %cr4, %eax 319 orl $CR4_PAE, %eax 320 movl %eax, %cr4 321 #else 322 movl R(IdlePTD), %eax 323 movl %eax,%cr3 /* load ptd addr into mmu */ 324 #endif 325 movl %cr0,%eax /* get control word */ 326 orl $CR0_PE|CR0_PG,%eax /* enable paging */ 327 movl %eax,%cr0 /* and let's page NOW! */ 328 329 pushl $begin /* jump to high virtualized address */ 330 ret 331 332 /* now running relocated at KERNBASE where the system is linked to run */ 333 begin: 334 /* set up bootstrap stack */ 335 movl proc0kstack,%eax /* location of in-kernel stack */ 336 /* bootstrap stack end location */ 337 leal (KSTACK_PAGES*PAGE_SIZE-PCB_SIZE)(%eax),%esp 338 339 xorl %ebp,%ebp /* mark end of frames */ 340 341 #ifdef PAE 342 movl IdlePDPT,%esi 343 #else 344 movl IdlePTD,%esi 345 #endif 346 movl %esi,(KSTACK_PAGES*PAGE_SIZE-PCB_SIZE+PCB_CR3)(%eax) 347 348 pushl physfree /* value of first for init386(first) */ 349 call init386 /* wire 386 chip for unix operation */ 350 351 /* 352 * Clean up the stack in a way that db_numargs() understands, so 353 * that backtraces in ddb don't underrun the stack. Traps for 354 * inaccessible memory are more fatal than usual this early. 355 */ 356 addl $4,%esp 357 358 call mi_startup /* autoconfiguration, mountroot etc */ 359 /* NOTREACHED */ 360 addl $0,%esp /* for db_numargs() again */ 361 362 /* 363 * Signal trampoline, copied to top of user stack 364 */ 365 NON_GPROF_ENTRY(sigcode) 366 calll *SIGF_HANDLER(%esp) 367 leal SIGF_UC(%esp),%eax /* get ucontext */ 368 pushl %eax 369 testl $PSL_VM,UC_EFLAGS(%eax) 370 jne 1f 371 movl UC_GS(%eax),%gs /* restore %gs */ 372 1: 373 movl $SYS_sigreturn,%eax 374 pushl %eax /* junk to fake return addr. */ 375 int $0x80 /* enter kernel with args */ 376 /* on stack */ 377 1: 378 jmp 1b 379 380 #ifdef COMPAT_FREEBSD4 381 ALIGN_TEXT 382 freebsd4_sigcode: 383 calll *SIGF_HANDLER(%esp) 384 leal SIGF_UC4(%esp),%eax /* get ucontext */ 385 pushl %eax 386 testl $PSL_VM,UC4_EFLAGS(%eax) 387 jne 1f 388 movl UC4_GS(%eax),%gs /* restore %gs */ 389 1: 390 movl $344,%eax /* 4.x SYS_sigreturn */ 391 pushl %eax /* junk to fake return addr. */ 392 int $0x80 /* enter kernel with args */ 393 /* on stack */ 394 1: 395 jmp 1b 396 #endif 397 398 #ifdef COMPAT_43 399 ALIGN_TEXT 400 osigcode: 401 call *SIGF_HANDLER(%esp) /* call signal handler */ 402 lea SIGF_SC(%esp),%eax /* get sigcontext */ 403 pushl %eax 404 testl $PSL_VM,SC_PS(%eax) 405 jne 9f 406 movl SC_GS(%eax),%gs /* restore %gs */ 407 9: 408 movl $103,%eax /* 3.x SYS_sigreturn */ 409 pushl %eax /* junk to fake return addr. */ 410 int $0x80 /* enter kernel with args */ 411 0: jmp 0b 412 #endif /* COMPAT_43 */ 413 414 ALIGN_TEXT 415 esigcode: 416 417 .data 418 .globl szsigcode 419 szsigcode: 420 .long esigcode-sigcode 421 #ifdef COMPAT_FREEBSD4 422 .globl szfreebsd4_sigcode 423 szfreebsd4_sigcode: 424 .long esigcode-freebsd4_sigcode 425 #endif 426 #ifdef COMPAT_43 427 .globl szosigcode 428 szosigcode: 429 .long esigcode-osigcode 430 #endif 431 .text 432 433 /********************************************************************** 434 * 435 * Recover the bootinfo passed to us from the boot program 436 * 437 */ 438 recover_bootinfo: 439 /* 440 * This code is called in different ways depending on what loaded 441 * and started the kernel. This is used to detect how we get the 442 * arguments from the other code and what we do with them. 443 * 444 * Old disk boot blocks: 445 * (*btext)(howto, bootdev, cyloffset, esym); 446 * [return address == 0, and can NOT be returned to] 447 * [cyloffset was not supported by the FreeBSD boot code 448 * and always passed in as 0] 449 * [esym is also known as total in the boot code, and 450 * was never properly supported by the FreeBSD boot code] 451 * 452 * Old diskless netboot code: 453 * (*btext)(0,0,0,0,&nfsdiskless,0,0,0); 454 * [return address != 0, and can NOT be returned to] 455 * If we are being booted by this code it will NOT work, 456 * so we are just going to halt if we find this case. 457 * 458 * New uniform boot code: 459 * (*btext)(howto, bootdev, 0, 0, 0, &bootinfo) 460 * [return address != 0, and can be returned to] 461 * 462 * There may seem to be a lot of wasted arguments in here, but 463 * that is so the newer boot code can still load very old kernels 464 * and old boot code can load new kernels. 465 */ 466 467 /* 468 * The old style disk boot blocks fake a frame on the stack and 469 * did an lret to get here. The frame on the stack has a return 470 * address of 0. 471 */ 472 cmpl $0,4(%ebp) 473 je olddiskboot 474 475 /* 476 * We have some form of return address, so this is either the 477 * old diskless netboot code, or the new uniform code. That can 478 * be detected by looking at the 5th argument, if it is 0 479 * we are being booted by the new uniform boot code. 480 */ 481 cmpl $0,24(%ebp) 482 je newboot 483 484 /* 485 * Seems we have been loaded by the old diskless boot code, we 486 * don't stand a chance of running as the diskless structure 487 * changed considerably between the two, so just halt. 488 */ 489 hlt 490 491 /* 492 * We have been loaded by the new uniform boot code. 493 * Let's check the bootinfo version, and if we do not understand 494 * it we return to the loader with a status of 1 to indicate this error 495 */ 496 newboot: 497 movl 28(%ebp),%ebx /* &bootinfo.version */ 498 movl BI_VERSION(%ebx),%eax 499 cmpl $1,%eax /* We only understand version 1 */ 500 je 1f 501 movl $1,%eax /* Return status */ 502 leave 503 /* 504 * XXX this returns to our caller's caller (as is required) since 505 * we didn't set up a frame and our caller did. 506 */ 507 ret 508 509 1: 510 /* 511 * If we have a kernelname copy it in 512 */ 513 movl BI_KERNELNAME(%ebx),%esi 514 cmpl $0,%esi 515 je 2f /* No kernelname */ 516 movl $MAXPATHLEN,%ecx /* Brute force!!! */ 517 movl $R(kernelname),%edi 518 cmpb $'/',(%esi) /* Make sure it starts with a slash */ 519 je 1f 520 movb $'/',(%edi) 521 incl %edi 522 decl %ecx 523 1: 524 cld 525 rep 526 movsb 527 528 2: 529 /* 530 * Determine the size of the boot loader's copy of the bootinfo 531 * struct. This is impossible to do properly because old versions 532 * of the struct don't contain a size field and there are 2 old 533 * versions with the same version number. 534 */ 535 movl $BI_ENDCOMMON,%ecx /* prepare for sizeless version */ 536 testl $RB_BOOTINFO,8(%ebp) /* bi_size (and bootinfo) valid? */ 537 je got_bi_size /* no, sizeless version */ 538 movl BI_SIZE(%ebx),%ecx 539 got_bi_size: 540 541 /* 542 * Copy the common part of the bootinfo struct 543 */ 544 movl %ebx,%esi 545 movl $R(bootinfo),%edi 546 cmpl $BOOTINFO_SIZE,%ecx 547 jbe got_common_bi_size 548 movl $BOOTINFO_SIZE,%ecx 549 got_common_bi_size: 550 cld 551 rep 552 movsb 553 554 #ifdef NFS_ROOT 555 #ifndef BOOTP_NFSV3 556 /* 557 * If we have a nfs_diskless structure copy it in 558 */ 559 movl BI_NFS_DISKLESS(%ebx),%esi 560 cmpl $0,%esi 561 je olddiskboot 562 movl $R(nfs_diskless),%edi 563 movl $NFSDISKLESS_SIZE,%ecx 564 cld 565 rep 566 movsb 567 movl $R(nfs_diskless_valid),%edi 568 movl $1,(%edi) 569 #endif 570 #endif 571 572 /* 573 * The old style disk boot. 574 * (*btext)(howto, bootdev, cyloffset, esym); 575 * Note that the newer boot code just falls into here to pick 576 * up howto and bootdev, cyloffset and esym are no longer used 577 */ 578 olddiskboot: 579 movl 8(%ebp),%eax 580 movl %eax,R(boothowto) 581 movl 12(%ebp),%eax 582 movl %eax,R(bootdev) 583 584 ret 585 586 587 /********************************************************************** 588 * 589 * Identify the CPU and initialize anything special about it 590 * 591 */ 592 identify_cpu: 593 594 /* Try to toggle alignment check flag; does not exist on 386. */ 595 pushfl 596 popl %eax 597 movl %eax,%ecx 598 orl $PSL_AC,%eax 599 pushl %eax 600 popfl 601 pushfl 602 popl %eax 603 xorl %ecx,%eax 604 andl $PSL_AC,%eax 605 pushl %ecx 606 popfl 607 608 testl %eax,%eax 609 jnz try486 610 611 /* NexGen CPU does not have aligment check flag. */ 612 pushfl 613 movl $0x5555, %eax 614 xorl %edx, %edx 615 movl $2, %ecx 616 clc 617 divl %ecx 618 jz trynexgen 619 popfl 620 movl $CPU_386,R(cpu) 621 jmp 3f 622 623 trynexgen: 624 popfl 625 movl $CPU_NX586,R(cpu) 626 movl $0x4778654e,R(cpu_vendor) # store vendor string 627 movl $0x72446e65,R(cpu_vendor+4) 628 movl $0x6e657669,R(cpu_vendor+8) 629 movl $0,R(cpu_vendor+12) 630 jmp 3f 631 632 try486: /* Try to toggle identification flag; does not exist on early 486s. */ 633 pushfl 634 popl %eax 635 movl %eax,%ecx 636 xorl $PSL_ID,%eax 637 pushl %eax 638 popfl 639 pushfl 640 popl %eax 641 xorl %ecx,%eax 642 andl $PSL_ID,%eax 643 pushl %ecx 644 popfl 645 646 testl %eax,%eax 647 jnz trycpuid 648 movl $CPU_486,R(cpu) 649 650 /* 651 * Check Cyrix CPU 652 * Cyrix CPUs do not change the undefined flags following 653 * execution of the divide instruction which divides 5 by 2. 654 * 655 * Note: CPUID is enabled on M2, so it passes another way. 656 */ 657 pushfl 658 movl $0x5555, %eax 659 xorl %edx, %edx 660 movl $2, %ecx 661 clc 662 divl %ecx 663 jnc trycyrix 664 popfl 665 jmp 3f /* You may use Intel CPU. */ 666 667 trycyrix: 668 popfl 669 /* 670 * IBM Bluelighting CPU also doesn't change the undefined flags. 671 * Because IBM doesn't disclose the information for Bluelighting 672 * CPU, we couldn't distinguish it from Cyrix's (including IBM 673 * brand of Cyrix CPUs). 674 */ 675 movl $0x69727943,R(cpu_vendor) # store vendor string 676 movl $0x736e4978,R(cpu_vendor+4) 677 movl $0x64616574,R(cpu_vendor+8) 678 jmp 3f 679 680 trycpuid: /* Use the `cpuid' instruction. */ 681 xorl %eax,%eax 682 cpuid # cpuid 0 683 movl %eax,R(cpu_high) # highest capability 684 movl %ebx,R(cpu_vendor) # store vendor string 685 movl %edx,R(cpu_vendor+4) 686 movl %ecx,R(cpu_vendor+8) 687 movb $0,R(cpu_vendor+12) 688 689 movl $1,%eax 690 cpuid # cpuid 1 691 movl %eax,R(cpu_id) # store cpu_id 692 movl %ebx,R(cpu_procinfo) # store cpu_procinfo 693 movl %edx,R(cpu_feature) # store cpu_feature 694 rorl $8,%eax # extract family type 695 andl $15,%eax 696 cmpl $5,%eax 697 jae 1f 698 699 /* less than Pentium; must be 486 */ 700 movl $CPU_486,R(cpu) 701 jmp 3f 702 1: 703 /* a Pentium? */ 704 cmpl $5,%eax 705 jne 2f 706 movl $CPU_586,R(cpu) 707 jmp 3f 708 2: 709 /* Greater than Pentium...call it a Pentium Pro */ 710 movl $CPU_686,R(cpu) 711 3: 712 ret 713 714 715 /********************************************************************** 716 * 717 * Create the first page directory and its page tables. 718 * 719 */ 720 721 create_pagetables: 722 723 /* Find end of kernel image (rounded up to a page boundary). */ 724 movl $R(_end),%esi 725 726 /* Include symbols, if any. */ 727 movl R(bootinfo+BI_ESYMTAB),%edi 728 testl %edi,%edi 729 je over_symalloc 730 movl %edi,%esi 731 movl $KERNBASE,%edi 732 addl %edi,R(bootinfo+BI_SYMTAB) 733 addl %edi,R(bootinfo+BI_ESYMTAB) 734 over_symalloc: 735 736 /* If we are told where the end of the kernel space is, believe it. */ 737 movl R(bootinfo+BI_KERNEND),%edi 738 testl %edi,%edi 739 je no_kernend 740 movl %edi,%esi 741 no_kernend: 742 743 addl $PAGE_MASK,%esi 744 andl $~PAGE_MASK,%esi 745 movl %esi,R(KERNend) /* save end of kernel */ 746 movl %esi,R(physfree) /* next free page is at end of kernel */ 747 748 /* Allocate Kernel Page Tables */ 749 ALLOCPAGES(NKPT) 750 movl %esi,R(KPTphys) 751 752 /* Allocate Page Table Directory */ 753 #ifdef PAE 754 /* XXX only need 32 bytes (easier for now) */ 755 ALLOCPAGES(1) 756 movl %esi,R(IdlePDPT) 757 #endif 758 ALLOCPAGES(NPGPTD) 759 movl %esi,R(IdlePTD) 760 761 /* Allocate UPAGES */ 762 ALLOCPAGES(UAREA_PAGES) 763 movl %esi,R(p0upa) 764 addl $KERNBASE, %esi 765 movl %esi, R(proc0uarea) 766 767 ALLOCPAGES(KSTACK_PAGES) 768 movl %esi,R(p0kpa) 769 addl $KERNBASE, %esi 770 movl %esi, R(proc0kstack) 771 772 ALLOCPAGES(1) /* vm86/bios stack */ 773 movl %esi,R(vm86phystk) 774 775 ALLOCPAGES(3) /* pgtable + ext + IOPAGES */ 776 movl %esi,R(vm86pa) 777 addl $KERNBASE, %esi 778 movl %esi, R(vm86paddr) 779 780 #ifdef SMP 781 /* Allocate cpu0's private data page */ 782 ALLOCPAGES(1) 783 movl %esi,R(cpu0pp) 784 addl $KERNBASE, %esi 785 movl %esi, R(cpu0prvpage) /* relocated to KVM space */ 786 787 /* Allocate SMP page table page */ 788 ALLOCPAGES(1) 789 movl %esi,R(SMPptpa) 790 addl $KERNBASE, %esi 791 movl %esi, R(SMPpt) /* relocated to KVM space */ 792 #endif /* SMP */ 793 794 /* Map read-only from zero to the end of the kernel text section */ 795 xorl %eax, %eax 796 xorl %edx,%edx 797 movl $R(etext),%ecx 798 addl $PAGE_MASK,%ecx 799 shrl $PAGE_SHIFT,%ecx 800 fillkptphys(%edx) 801 802 /* Map read-write, data, bss and symbols */ 803 movl $R(etext),%eax 804 addl $PAGE_MASK, %eax 805 andl $~PAGE_MASK, %eax 806 movl $PG_RW,%edx 807 movl R(KERNend),%ecx 808 subl %eax,%ecx 809 shrl $PAGE_SHIFT,%ecx 810 fillkptphys(%edx) 811 812 /* Map page directory. */ 813 #ifdef PAE 814 movl R(IdlePDPT), %eax 815 movl $1, %ecx 816 fillkptphys($PG_RW) 817 #endif 818 819 movl R(IdlePTD), %eax 820 movl $NPGPTD, %ecx 821 fillkptphys($PG_RW) 822 823 /* Map proc0's UPAGES in the physical way ... */ 824 movl R(p0upa), %eax 825 movl $(UAREA_PAGES), %ecx 826 fillkptphys($PG_RW) 827 828 /* Map proc0's KSTACK in the physical way ... */ 829 movl R(p0kpa), %eax 830 movl $(KSTACK_PAGES), %ecx 831 fillkptphys($PG_RW) 832 833 /* Map ISA hole */ 834 movl $ISA_HOLE_START, %eax 835 movl $ISA_HOLE_LENGTH>>PAGE_SHIFT, %ecx 836 fillkptphys($PG_RW) 837 838 /* Map space for the vm86 region */ 839 movl R(vm86phystk), %eax 840 movl $4, %ecx 841 fillkptphys($PG_RW) 842 843 /* Map page 0 into the vm86 page table */ 844 movl $0, %eax 845 movl $0, %ebx 846 movl $1, %ecx 847 fillkpt(R(vm86pa), $PG_RW|PG_U) 848 849 /* ...likewise for the ISA hole */ 850 movl $ISA_HOLE_START, %eax 851 movl $ISA_HOLE_START>>PAGE_SHIFT, %ebx 852 movl $ISA_HOLE_LENGTH>>PAGE_SHIFT, %ecx 853 fillkpt(R(vm86pa), $PG_RW|PG_U) 854 855 #ifdef SMP 856 /* Map cpu0's private page into global kmem (4K @ cpu0prvpage) */ 857 movl R(cpu0pp), %eax 858 movl $1, %ecx 859 fillkptphys($PG_RW) 860 861 /* Map SMP page table page into global kmem FWIW */ 862 movl R(SMPptpa), %eax 863 movl $1, %ecx 864 fillkptphys($PG_RW) 865 866 /* Map the private page into the SMP page table */ 867 movl R(cpu0pp), %eax 868 movl $0, %ebx /* pte offset = 0 */ 869 movl $1, %ecx /* one private page coming right up */ 870 fillkpt(R(SMPptpa), $PG_RW) 871 872 /* ... and put the page table table in the pde. */ 873 movl R(SMPptpa), %eax 874 movl $MPPTDI, %ebx 875 movl $1, %ecx 876 fillkpt(R(IdlePTD), $PG_RW) 877 878 /* Fakeup VA for the local apic to allow early traps. */ 879 ALLOCPAGES(1) 880 movl %esi, %eax 881 movl $(NPTEPG-1), %ebx /* pte offset = NTEPG-1 */ 882 movl $1, %ecx /* one private pt coming right up */ 883 fillkpt(R(SMPptpa), $PG_RW) 884 #endif /* SMP */ 885 886 /* install a pde for temporary double map of bottom of VA */ 887 movl R(KPTphys), %eax 888 xorl %ebx, %ebx 889 movl $NKPT, %ecx 890 fillkpt(R(IdlePTD), $PG_RW) 891 892 /* install pde's for pt's */ 893 movl R(KPTphys), %eax 894 movl $KPTDI, %ebx 895 movl $NKPT, %ecx 896 fillkpt(R(IdlePTD), $PG_RW) 897 898 /* install a pde recursively mapping page directory as a page table */ 899 movl R(IdlePTD), %eax 900 movl $PTDPTDI, %ebx 901 movl $NPGPTD,%ecx 902 fillkpt(R(IdlePTD), $PG_RW) 903 904 #ifdef PAE 905 movl R(IdlePTD), %eax 906 xorl %ebx, %ebx 907 movl $NPGPTD, %ecx 908 fillkpt(R(IdlePDPT), $0x0) 909 #endif 910 911 ret
Cache object: 5f676469ad09b028eb3904901ba1216e
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