locore.s revision 112841
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: head/sys/i386/i386/locore.s 112841 2003-03-30 05:24:52Z 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 * NOTE: PTDpde, PTmap, and PTD are being defined as address symbols. 74 * In C you access them directly, and not with a '*'. Storage is not being 75 * allocated. They will magically address the correct locations in KVM 76 * which C will treat as normal variables of the type they are defined in 77 * machine/pmap.h, i.e. PTDpde = XX ; to set a PDE entry, NOT *PTDpde = XX; 78 */ 79 .globl PTmap,PTD,PTDpde 80 .set PTmap,(PTDPTDI << PDRSHIFT) 81 .set PTD,PTmap + (PTDPTDI * PAGE_SIZE) 82 .set PTDpde,PTD + (PTDPTDI * PDESIZE) 83 84/* 85 * APTmap, APTD is the alternate recursive pagemap. 86 * It's used when modifying another process's page tables. 87 * See the note above. It is true here as well. 88 */ 89 .globl APTmap,APTD,APTDpde 90 .set APTmap,APTDPTDI << PDRSHIFT 91 .set APTD,APTmap + (APTDPTDI * PAGE_SIZE) 92 .set APTDpde,PTD + (APTDPTDI * PDESIZE) 93 94#ifdef SMP 95/* 96 * Define layout of per-cpu address space. 97 * This is "constructed" in locore.s on the BSP and in mp_machdep.c 98 * for each AP. DO NOT REORDER THESE WITHOUT UPDATING THE REST! 99 */ 100 .globl SMP_prvspace, lapic 101 .set SMP_prvspace,(MPPTDI << PDRSHIFT) 102 .set lapic,SMP_prvspace + (NPTEPG-1) * PAGE_SIZE 103#endif /* SMP */ 104 105/* 106 * Compiled KERNBASE location 107 */ 108 .globl kernbase 109 .set kernbase,KERNBASE 110 111/* 112 * Globals 113 */ 114 .data 115 ALIGN_DATA /* just to be sure */ 116 117 .globl HIDENAME(tmpstk) 118 .space 0x2000 /* space for tmpstk - temporary stack */ 119HIDENAME(tmpstk): 120 121 .globl bootinfo 122bootinfo: .space BOOTINFO_SIZE /* bootinfo that we can handle */ 123 124 .globl KERNend 125KERNend: .long 0 /* phys addr end of kernel (just after bss) */ 126physfree: .long 0 /* phys addr of next free page */ 127 128#ifdef SMP 129 .globl cpu0prvpage 130cpu0pp: .long 0 /* phys addr cpu0 private pg */ 131cpu0prvpage: .long 0 /* relocated version */ 132 133 .globl SMPpt 134SMPptpa: .long 0 /* phys addr SMP page table */ 135SMPpt: .long 0 /* relocated version */ 136#endif /* SMP */ 137 138 .globl IdlePTD 139IdlePTD: .long 0 /* phys addr of kernel PTD */ 140 141#ifdef PAE 142 .globl IdlePDPT 143IdlePDPT: .long 0 /* phys addr of kernel PDPT */ 144#endif 145 146#ifdef SMP 147 .globl KPTphys 148#endif 149KPTphys: .long 0 /* phys addr of kernel page tables */ 150 151 .globl proc0uarea, proc0kstack 152proc0uarea: .long 0 /* address of proc 0 uarea space */ 153proc0kstack: .long 0 /* address of proc 0 kstack space */ 154p0upa: .long 0 /* phys addr of proc0's UAREA */ 155p0kpa: .long 0 /* phys addr of proc0's STACK */ 156 157vm86phystk: .long 0 /* PA of vm86/bios stack */ 158 159 .globl vm86paddr, vm86pa 160vm86paddr: .long 0 /* address of vm86 region */ 161vm86pa: .long 0 /* phys addr of vm86 region */ 162 163#ifdef PC98 164 .globl pc98_system_parameter 165pc98_system_parameter: 166 .space 0x240 167#endif 168 169/********************************************************************** 170 * 171 * Some handy macros 172 * 173 */ 174 175#define R(foo) ((foo)-KERNBASE) 176 177#define ALLOCPAGES(foo) \ 178 movl R(physfree), %esi ; \ 179 movl $((foo)*PAGE_SIZE), %eax ; \ 180 addl %esi, %eax ; \ 181 movl %eax, R(physfree) ; \ 182 movl %esi, %edi ; \ 183 movl $((foo)*PAGE_SIZE),%ecx ; \ 184 xorl %eax,%eax ; \ 185 cld ; \ 186 rep ; \ 187 stosb 188 189/* 190 * fillkpt 191 * eax = page frame address 192 * ebx = index into page table 193 * ecx = how many pages to map 194 * base = base address of page dir/table 195 * prot = protection bits 196 */ 197#define fillkpt(base, prot) \ 198 shll $PTESHIFT,%ebx ; \ 199 addl base,%ebx ; \ 200 orl $PG_V,%eax ; \ 201 orl prot,%eax ; \ 2021: movl %eax,(%ebx) ; \ 203 addl $PAGE_SIZE,%eax ; /* increment physical address */ \ 204 addl $PTESIZE,%ebx ; /* next pte */ \ 205 loop 1b 206 207/* 208 * fillkptphys(prot) 209 * eax = physical address 210 * ecx = how many pages to map 211 * prot = protection bits 212 */ 213#define fillkptphys(prot) \ 214 movl %eax, %ebx ; \ 215 shrl $PAGE_SHIFT, %ebx ; \ 216 fillkpt(R(KPTphys), prot) 217 218 .text 219/********************************************************************** 220 * 221 * This is where the bootblocks start us, set the ball rolling... 222 * 223 */ 224NON_GPROF_ENTRY(btext) 225 226#ifdef PC98 227 /* save SYSTEM PARAMETER for resume (NS/T or other) */ 228 movl $0xa1400,%esi 229 movl $R(pc98_system_parameter),%edi 230 movl $0x0240,%ecx 231 cld 232 rep 233 movsb 234#else /* IBM-PC */ 235/* Tell the bios to warmboot next time */ 236 movw $0x1234,0x472 237#endif /* PC98 */ 238 239/* Set up a real frame in case the double return in newboot is executed. */ 240 pushl %ebp 241 movl %esp, %ebp 242 243/* Don't trust what the BIOS gives for eflags. */ 244 pushl $PSL_KERNEL 245 popfl 246 247/* 248 * Don't trust what the BIOS gives for %fs and %gs. Trust the bootstrap 249 * to set %cs, %ds, %es and %ss. 250 */ 251 mov %ds, %ax 252 mov %ax, %fs 253 mov %ax, %gs 254 255 call recover_bootinfo 256 257/* Get onto a stack that we can trust. */ 258/* 259 * XXX this step is delayed in case recover_bootinfo needs to return via 260 * the old stack, but it need not be, since recover_bootinfo actually 261 * returns via the old frame. 262 */ 263 movl $R(HIDENAME(tmpstk)),%esp 264 265#ifdef PC98 266 /* pc98_machine_type & M_EPSON_PC98 */ 267 testb $0x02,R(pc98_system_parameter)+220 268 jz 3f 269 /* epson_machine_id <= 0x0b */ 270 cmpb $0x0b,R(pc98_system_parameter)+224 271 ja 3f 272 273 /* count up memory */ 274 movl $0x100000,%eax /* next, talley remaining memory */ 275 movl $0xFFF-0x100,%ecx 2761: movl 0(%eax),%ebx /* save location to check */ 277 movl $0xa55a5aa5,0(%eax) /* write test pattern */ 278 cmpl $0xa55a5aa5,0(%eax) /* does not check yet for rollover */ 279 jne 2f 280 movl %ebx,0(%eax) /* restore memory */ 281 addl $PAGE_SIZE,%eax 282 loop 1b 2832: subl $0x100000,%eax 284 shrl $17,%eax 285 movb %al,R(pc98_system_parameter)+1 2863: 287 288 movw R(pc98_system_parameter+0x86),%ax 289 movw %ax,R(cpu_id) 290#endif 291 292 call identify_cpu 293 294/* clear bss */ 295/* 296 * XXX this should be done a little earlier. 297 * 298 * XXX we don't check that there is memory for our bss and page tables 299 * before using it. 300 * 301 * XXX the boot program somewhat bogusly clears the bss. We still have 302 * to do it in case we were unzipped by kzipboot. Then the boot program 303 * only clears kzipboot's bss. 304 * 305 * XXX the gdt and idt are still somewhere in the boot program. We 306 * depend on the convention that the boot program is below 1MB and we 307 * are above 1MB to keep the gdt and idt away from the bss and page 308 * tables. 309 */ 310 movl $R(end),%ecx 311 movl $R(edata),%edi 312 subl %edi,%ecx 313 xorl %eax,%eax 314 cld 315 rep 316 stosb 317 318 call create_pagetables 319 320/* 321 * If the CPU has support for VME, turn it on. 322 */ 323 testl $CPUID_VME, R(cpu_feature) 324 jz 1f 325 movl %cr4, %eax 326 orl $CR4_VME, %eax 327 movl %eax, %cr4 3281: 329 330/* Now enable paging */ 331#ifdef PAE 332 movl R(IdlePDPT), %eax 333 movl %eax, %cr3 334 movl %cr4, %eax 335 orl $CR4_PAE, %eax 336 movl %eax, %cr4 337#else 338 movl R(IdlePTD), %eax 339 movl %eax,%cr3 /* load ptd addr into mmu */ 340#endif 341 movl %cr0,%eax /* get control word */ 342 orl $CR0_PE|CR0_PG,%eax /* enable paging */ 343 movl %eax,%cr0 /* and let's page NOW! */ 344 345 pushl $begin /* jump to high virtualized address */ 346 ret 347 348/* now running relocated at KERNBASE where the system is linked to run */ 349begin: 350 /* set up bootstrap stack */ 351 movl proc0kstack,%eax /* location of in-kernel stack */ 352 /* bootstrap stack end location */ 353 leal (KSTACK_PAGES*PAGE_SIZE-PCB_SIZE)(%eax),%esp 354 355 xorl %ebp,%ebp /* mark end of frames */ 356 357#ifdef PAE 358 movl IdlePDPT,%esi 359#else 360 movl IdlePTD,%esi 361#endif 362 movl %esi,(KSTACK_PAGES*PAGE_SIZE-PCB_SIZE+PCB_CR3)(%eax) 363 364 pushl physfree /* value of first for init386(first) */ 365 call init386 /* wire 386 chip for unix operation */ 366 367 /* 368 * Clean up the stack in a way that db_numargs() understands, so 369 * that backtraces in ddb don't underrun the stack. Traps for 370 * inaccessible memory are more fatal than usual this early. 371 */ 372 addl $4,%esp 373 374 call mi_startup /* autoconfiguration, mountroot etc */ 375 /* NOTREACHED */ 376 addl $0,%esp /* for db_numargs() again */ 377 378/* 379 * Signal trampoline, copied to top of user stack 380 */ 381NON_GPROF_ENTRY(sigcode) 382 calll *SIGF_HANDLER(%esp) 383 leal SIGF_UC(%esp),%eax /* get ucontext */ 384 pushl %eax 385 testl $PSL_VM,UC_EFLAGS(%eax) 386 jne 1f 387 movl UC_GS(%eax),%gs /* restore %gs */ 3881: 389 movl $SYS_sigreturn,%eax 390 pushl %eax /* junk to fake return addr. */ 391 int $0x80 /* enter kernel with args */ 392 /* on stack */ 3931: 394 jmp 1b 395 396#ifdef COMPAT_FREEBSD4 397 ALIGN_TEXT 398freebsd4_sigcode: 399 calll *SIGF_HANDLER(%esp) 400 leal SIGF_UC4(%esp),%eax /* get ucontext */ 401 pushl %eax 402 testl $PSL_VM,UC4_EFLAGS(%eax) 403 jne 1f 404 movl UC4_GS(%eax),%gs /* restore %gs */ 4051: 406 movl $344,%eax /* 4.x SYS_sigreturn */ 407 pushl %eax /* junk to fake return addr. */ 408 int $0x80 /* enter kernel with args */ 409 /* on stack */ 4101: 411 jmp 1b 412#endif 413 414#ifdef COMPAT_43 415 ALIGN_TEXT 416osigcode: 417 call *SIGF_HANDLER(%esp) /* call signal handler */ 418 lea SIGF_SC(%esp),%eax /* get sigcontext */ 419 pushl %eax 420 testl $PSL_VM,SC_PS(%eax) 421 jne 9f 422 movl SC_GS(%eax),%gs /* restore %gs */ 4239: 424 movl $103,%eax /* 3.x SYS_sigreturn */ 425 pushl %eax /* junk to fake return addr. */ 426 int $0x80 /* enter kernel with args */ 4270: jmp 0b 428#endif /* COMPAT_43 */ 429 430 ALIGN_TEXT 431esigcode: 432 433 .data 434 .globl szsigcode 435szsigcode: 436 .long esigcode-sigcode 437#ifdef COMPAT_FREEBSD4 438 .globl szfreebsd4_sigcode 439szfreebsd4_sigcode: 440 .long esigcode-freebsd4_sigcode 441#endif 442#ifdef COMPAT_43 443 .globl szosigcode 444szosigcode: 445 .long esigcode-osigcode 446#endif 447 .text 448 449/********************************************************************** 450 * 451 * Recover the bootinfo passed to us from the boot program 452 * 453 */ 454recover_bootinfo: 455 /* 456 * This code is called in different ways depending on what loaded 457 * and started the kernel. This is used to detect how we get the 458 * arguments from the other code and what we do with them. 459 * 460 * Old disk boot blocks: 461 * (*btext)(howto, bootdev, cyloffset, esym); 462 * [return address == 0, and can NOT be returned to] 463 * [cyloffset was not supported by the FreeBSD boot code 464 * and always passed in as 0] 465 * [esym is also known as total in the boot code, and 466 * was never properly supported by the FreeBSD boot code] 467 * 468 * Old diskless netboot code: 469 * (*btext)(0,0,0,0,&nfsdiskless,0,0,0); 470 * [return address != 0, and can NOT be returned to] 471 * If we are being booted by this code it will NOT work, 472 * so we are just going to halt if we find this case. 473 * 474 * New uniform boot code: 475 * (*btext)(howto, bootdev, 0, 0, 0, &bootinfo) 476 * [return address != 0, and can be returned to] 477 * 478 * There may seem to be a lot of wasted arguments in here, but 479 * that is so the newer boot code can still load very old kernels 480 * and old boot code can load new kernels. 481 */ 482 483 /* 484 * The old style disk boot blocks fake a frame on the stack and 485 * did an lret to get here. The frame on the stack has a return 486 * address of 0. 487 */ 488 cmpl $0,4(%ebp) 489 je olddiskboot 490 491 /* 492 * We have some form of return address, so this is either the 493 * old diskless netboot code, or the new uniform code. That can 494 * be detected by looking at the 5th argument, if it is 0 495 * we are being booted by the new uniform boot code. 496 */ 497 cmpl $0,24(%ebp) 498 je newboot 499 500 /* 501 * Seems we have been loaded by the old diskless boot code, we 502 * don't stand a chance of running as the diskless structure 503 * changed considerably between the two, so just halt. 504 */ 505 hlt 506 507 /* 508 * We have been loaded by the new uniform boot code. 509 * Let's check the bootinfo version, and if we do not understand 510 * it we return to the loader with a status of 1 to indicate this error 511 */ 512newboot: 513 movl 28(%ebp),%ebx /* &bootinfo.version */ 514 movl BI_VERSION(%ebx),%eax 515 cmpl $1,%eax /* We only understand version 1 */ 516 je 1f 517 movl $1,%eax /* Return status */ 518 leave 519 /* 520 * XXX this returns to our caller's caller (as is required) since 521 * we didn't set up a frame and our caller did. 522 */ 523 ret 524 5251: 526 /* 527 * If we have a kernelname copy it in 528 */ 529 movl BI_KERNELNAME(%ebx),%esi 530 cmpl $0,%esi 531 je 2f /* No kernelname */ 532 movl $MAXPATHLEN,%ecx /* Brute force!!! */ 533 movl $R(kernelname),%edi 534 cmpb $'/',(%esi) /* Make sure it starts with a slash */ 535 je 1f 536 movb $'/',(%edi) 537 incl %edi 538 decl %ecx 5391: 540 cld 541 rep 542 movsb 543 5442: 545 /* 546 * Determine the size of the boot loader's copy of the bootinfo 547 * struct. This is impossible to do properly because old versions 548 * of the struct don't contain a size field and there are 2 old 549 * versions with the same version number. 550 */ 551 movl $BI_ENDCOMMON,%ecx /* prepare for sizeless version */ 552 testl $RB_BOOTINFO,8(%ebp) /* bi_size (and bootinfo) valid? */ 553 je got_bi_size /* no, sizeless version */ 554 movl BI_SIZE(%ebx),%ecx 555got_bi_size: 556 557 /* 558 * Copy the common part of the bootinfo struct 559 */ 560 movl %ebx,%esi 561 movl $R(bootinfo),%edi 562 cmpl $BOOTINFO_SIZE,%ecx 563 jbe got_common_bi_size 564 movl $BOOTINFO_SIZE,%ecx 565got_common_bi_size: 566 cld 567 rep 568 movsb 569 570#ifdef NFS_ROOT 571#ifndef BOOTP_NFSV3 572 /* 573 * If we have a nfs_diskless structure copy it in 574 */ 575 movl BI_NFS_DISKLESS(%ebx),%esi 576 cmpl $0,%esi 577 je olddiskboot 578 movl $R(nfs_diskless),%edi 579 movl $NFSDISKLESS_SIZE,%ecx 580 cld 581 rep 582 movsb 583 movl $R(nfs_diskless_valid),%edi 584 movl $1,(%edi) 585#endif 586#endif 587 588 /* 589 * The old style disk boot. 590 * (*btext)(howto, bootdev, cyloffset, esym); 591 * Note that the newer boot code just falls into here to pick 592 * up howto and bootdev, cyloffset and esym are no longer used 593 */ 594olddiskboot: 595 movl 8(%ebp),%eax 596 movl %eax,R(boothowto) 597 movl 12(%ebp),%eax 598 movl %eax,R(bootdev) 599 600 ret 601 602 603/********************************************************************** 604 * 605 * Identify the CPU and initialize anything special about it 606 * 607 */ 608identify_cpu: 609 610 /* Try to toggle alignment check flag; does not exist on 386. */ 611 pushfl 612 popl %eax 613 movl %eax,%ecx 614 orl $PSL_AC,%eax 615 pushl %eax 616 popfl 617 pushfl 618 popl %eax 619 xorl %ecx,%eax 620 andl $PSL_AC,%eax 621 pushl %ecx 622 popfl 623 624 testl %eax,%eax 625 jnz try486 626 627 /* NexGen CPU does not have aligment check flag. */ 628 pushfl 629 movl $0x5555, %eax 630 xorl %edx, %edx 631 movl $2, %ecx 632 clc 633 divl %ecx 634 jz trynexgen 635 popfl 636 movl $CPU_386,R(cpu) 637 jmp 3f 638 639trynexgen: 640 popfl 641 movl $CPU_NX586,R(cpu) 642 movl $0x4778654e,R(cpu_vendor) # store vendor string 643 movl $0x72446e65,R(cpu_vendor+4) 644 movl $0x6e657669,R(cpu_vendor+8) 645 movl $0,R(cpu_vendor+12) 646 jmp 3f 647 648try486: /* Try to toggle identification flag; does not exist on early 486s. */ 649 pushfl 650 popl %eax 651 movl %eax,%ecx 652 xorl $PSL_ID,%eax 653 pushl %eax 654 popfl 655 pushfl 656 popl %eax 657 xorl %ecx,%eax 658 andl $PSL_ID,%eax 659 pushl %ecx 660 popfl 661 662 testl %eax,%eax 663 jnz trycpuid 664 movl $CPU_486,R(cpu) 665 666 /* 667 * Check Cyrix CPU 668 * Cyrix CPUs do not change the undefined flags following 669 * execution of the divide instruction which divides 5 by 2. 670 * 671 * Note: CPUID is enabled on M2, so it passes another way. 672 */ 673 pushfl 674 movl $0x5555, %eax 675 xorl %edx, %edx 676 movl $2, %ecx 677 clc 678 divl %ecx 679 jnc trycyrix 680 popfl 681 jmp 3f /* You may use Intel CPU. */ 682 683trycyrix: 684 popfl 685 /* 686 * IBM Bluelighting CPU also doesn't change the undefined flags. 687 * Because IBM doesn't disclose the information for Bluelighting 688 * CPU, we couldn't distinguish it from Cyrix's (including IBM 689 * brand of Cyrix CPUs). 690 */ 691 movl $0x69727943,R(cpu_vendor) # store vendor string 692 movl $0x736e4978,R(cpu_vendor+4) 693 movl $0x64616574,R(cpu_vendor+8) 694 jmp 3f 695 696trycpuid: /* Use the `cpuid' instruction. */ 697 xorl %eax,%eax 698 cpuid # cpuid 0 699 movl %eax,R(cpu_high) # highest capability 700 movl %ebx,R(cpu_vendor) # store vendor string 701 movl %edx,R(cpu_vendor+4) 702 movl %ecx,R(cpu_vendor+8) 703 movb $0,R(cpu_vendor+12) 704 705 movl $1,%eax 706 cpuid # cpuid 1 707 movl %eax,R(cpu_id) # store cpu_id 708 movl %ebx,R(cpu_procinfo) # store cpu_procinfo 709 movl %edx,R(cpu_feature) # store cpu_feature 710 rorl $8,%eax # extract family type 711 andl $15,%eax 712 cmpl $5,%eax 713 jae 1f 714 715 /* less than Pentium; must be 486 */ 716 movl $CPU_486,R(cpu) 717 jmp 3f 7181: 719 /* a Pentium? */ 720 cmpl $5,%eax 721 jne 2f 722 movl $CPU_586,R(cpu) 723 jmp 3f 7242: 725 /* Greater than Pentium...call it a Pentium Pro */ 726 movl $CPU_686,R(cpu) 7273: 728 ret 729 730 731/********************************************************************** 732 * 733 * Create the first page directory and its page tables. 734 * 735 */ 736 737create_pagetables: 738 739/* Find end of kernel image (rounded up to a page boundary). */ 740 movl $R(_end),%esi 741 742/* Include symbols, if any. */ 743 movl R(bootinfo+BI_ESYMTAB),%edi 744 testl %edi,%edi 745 je over_symalloc 746 movl %edi,%esi 747 movl $KERNBASE,%edi 748 addl %edi,R(bootinfo+BI_SYMTAB) 749 addl %edi,R(bootinfo+BI_ESYMTAB) 750over_symalloc: 751 752/* If we are told where the end of the kernel space is, believe it. */ 753 movl R(bootinfo+BI_KERNEND),%edi 754 testl %edi,%edi 755 je no_kernend 756 movl %edi,%esi 757no_kernend: 758 759 addl $PAGE_MASK,%esi 760 andl $~PAGE_MASK,%esi 761 movl %esi,R(KERNend) /* save end of kernel */ 762 movl %esi,R(physfree) /* next free page is at end of kernel */ 763 764/* Allocate Kernel Page Tables */ 765 ALLOCPAGES(NKPT) 766 movl %esi,R(KPTphys) 767 768/* Allocate Page Table Directory */ 769#ifdef PAE 770 /* XXX only need 32 bytes (easier for now) */ 771 ALLOCPAGES(1) 772 movl %esi,R(IdlePDPT) 773#endif 774 ALLOCPAGES(NPGPTD) 775 movl %esi,R(IdlePTD) 776 777/* Allocate UPAGES */ 778 ALLOCPAGES(UAREA_PAGES) 779 movl %esi,R(p0upa) 780 addl $KERNBASE, %esi 781 movl %esi, R(proc0uarea) 782 783 ALLOCPAGES(KSTACK_PAGES) 784 movl %esi,R(p0kpa) 785 addl $KERNBASE, %esi 786 movl %esi, R(proc0kstack) 787 788 ALLOCPAGES(1) /* vm86/bios stack */ 789 movl %esi,R(vm86phystk) 790 791 ALLOCPAGES(3) /* pgtable + ext + IOPAGES */ 792 movl %esi,R(vm86pa) 793 addl $KERNBASE, %esi 794 movl %esi, R(vm86paddr) 795 796#ifdef SMP 797/* Allocate cpu0's private data page */ 798 ALLOCPAGES(1) 799 movl %esi,R(cpu0pp) 800 addl $KERNBASE, %esi 801 movl %esi, R(cpu0prvpage) /* relocated to KVM space */ 802 803/* Allocate SMP page table page */ 804 ALLOCPAGES(1) 805 movl %esi,R(SMPptpa) 806 addl $KERNBASE, %esi 807 movl %esi, R(SMPpt) /* relocated to KVM space */ 808#endif /* SMP */ 809 810/* Map read-only from zero to the end of the kernel text section */ 811 xorl %eax, %eax 812 xorl %edx,%edx 813 movl $R(etext),%ecx 814 addl $PAGE_MASK,%ecx 815 shrl $PAGE_SHIFT,%ecx 816 fillkptphys(%edx) 817 818/* Map read-write, data, bss and symbols */ 819 movl $R(etext),%eax 820 addl $PAGE_MASK, %eax 821 andl $~PAGE_MASK, %eax 822 movl $PG_RW,%edx 823 movl R(KERNend),%ecx 824 subl %eax,%ecx 825 shrl $PAGE_SHIFT,%ecx 826 fillkptphys(%edx) 827 828/* Map page directory. */ 829#ifdef PAE 830 movl R(IdlePDPT), %eax 831 movl $1, %ecx 832 fillkptphys($PG_RW) 833#endif 834 835 movl R(IdlePTD), %eax 836 movl $NPGPTD, %ecx 837 fillkptphys($PG_RW) 838 839/* Map proc0's UPAGES in the physical way ... */ 840 movl R(p0upa), %eax 841 movl $(UAREA_PAGES), %ecx 842 fillkptphys($PG_RW) 843 844/* Map proc0's KSTACK in the physical way ... */ 845 movl R(p0kpa), %eax 846 movl $(KSTACK_PAGES), %ecx 847 fillkptphys($PG_RW) 848 849/* Map ISA hole */ 850 movl $ISA_HOLE_START, %eax 851 movl $ISA_HOLE_LENGTH>>PAGE_SHIFT, %ecx 852 fillkptphys($PG_RW) 853 854/* Map space for the vm86 region */ 855 movl R(vm86phystk), %eax 856 movl $4, %ecx 857 fillkptphys($PG_RW) 858 859/* Map page 0 into the vm86 page table */ 860 movl $0, %eax 861 movl $0, %ebx 862 movl $1, %ecx 863 fillkpt(R(vm86pa), $PG_RW|PG_U) 864 865/* ...likewise for the ISA hole */ 866 movl $ISA_HOLE_START, %eax 867 movl $ISA_HOLE_START>>PAGE_SHIFT, %ebx 868 movl $ISA_HOLE_LENGTH>>PAGE_SHIFT, %ecx 869 fillkpt(R(vm86pa), $PG_RW|PG_U) 870 871#ifdef SMP 872/* Map cpu0's private page into global kmem (4K @ cpu0prvpage) */ 873 movl R(cpu0pp), %eax 874 movl $1, %ecx 875 fillkptphys($PG_RW) 876 877/* Map SMP page table page into global kmem FWIW */ 878 movl R(SMPptpa), %eax 879 movl $1, %ecx 880 fillkptphys($PG_RW) 881 882/* Map the private page into the SMP page table */ 883 movl R(cpu0pp), %eax 884 movl $0, %ebx /* pte offset = 0 */ 885 movl $1, %ecx /* one private page coming right up */ 886 fillkpt(R(SMPptpa), $PG_RW) 887 888/* ... and put the page table table in the pde. */ 889 movl R(SMPptpa), %eax 890 movl $MPPTDI, %ebx 891 movl $1, %ecx 892 fillkpt(R(IdlePTD), $PG_RW) 893 894/* Fakeup VA for the local apic to allow early traps. */ 895 ALLOCPAGES(1) 896 movl %esi, %eax 897 movl $(NPTEPG-1), %ebx /* pte offset = NTEPG-1 */ 898 movl $1, %ecx /* one private pt coming right up */ 899 fillkpt(R(SMPptpa), $PG_RW) 900#endif /* SMP */ 901 902/* install a pde for temporary double map of bottom of VA */ 903 movl R(KPTphys), %eax 904 xorl %ebx, %ebx 905 movl $NKPT, %ecx 906 fillkpt(R(IdlePTD), $PG_RW) 907 908/* install pde's for pt's */ 909 movl R(KPTphys), %eax 910 movl $KPTDI, %ebx 911 movl $NKPT, %ecx 912 fillkpt(R(IdlePTD), $PG_RW) 913 914/* install a pde recursively mapping page directory as a page table */ 915 movl R(IdlePTD), %eax 916 movl $PTDPTDI, %ebx 917 movl $NPGPTD,%ecx 918 fillkpt(R(IdlePTD), $PG_RW) 919 920#ifdef PAE 921 movl R(IdlePTD), %eax 922 xorl %ebx, %ebx 923 movl $NPGPTD, %ecx 924 fillkpt(R(IdlePDPT), $0x0) 925#endif 926 927 ret 928