locore.s revision 118186
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 118186 2003-07-29 21:57:01Z bde $ 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 .space 0x2000 /* space for tmpstk - temporary stack */ 102tmpstk: 103 104 .globl bootinfo 105bootinfo: .space BOOTINFO_SIZE /* bootinfo that we can handle */ 106 107 .globl KERNend 108KERNend: .long 0 /* phys addr end of kernel (just after bss) */ 109physfree: .long 0 /* phys addr of next free page */ 110 111#ifdef SMP 112 .globl cpu0prvpage 113cpu0pp: .long 0 /* phys addr cpu0 private pg */ 114cpu0prvpage: .long 0 /* relocated version */ 115 116 .globl SMPpt 117SMPptpa: .long 0 /* phys addr SMP page table */ 118SMPpt: .long 0 /* relocated version */ 119#endif /* SMP */ 120 121 .globl IdlePTD 122IdlePTD: .long 0 /* phys addr of kernel PTD */ 123 124#ifdef PAE 125 .globl IdlePDPT 126IdlePDPT: .long 0 /* phys addr of kernel PDPT */ 127#endif 128 129#ifdef SMP 130 .globl KPTphys 131#endif 132KPTphys: .long 0 /* phys addr of kernel page tables */ 133 134 .globl proc0uarea, proc0kstack 135proc0uarea: .long 0 /* address of proc 0 uarea space */ 136proc0kstack: .long 0 /* address of proc 0 kstack space */ 137p0upa: .long 0 /* phys addr of proc0's UAREA */ 138p0kpa: .long 0 /* phys addr of proc0's STACK */ 139 140vm86phystk: .long 0 /* PA of vm86/bios stack */ 141 142 .globl vm86paddr, vm86pa 143vm86paddr: .long 0 /* address of vm86 region */ 144vm86pa: .long 0 /* phys addr of vm86 region */ 145 146#ifdef PC98 147 .globl pc98_system_parameter 148pc98_system_parameter: 149 .space 0x240 150#endif 151 152/********************************************************************** 153 * 154 * Some handy macros 155 * 156 */ 157 158#define R(foo) ((foo)-KERNBASE) 159 160#define ALLOCPAGES(foo) \ 161 movl R(physfree), %esi ; \ 162 movl $((foo)*PAGE_SIZE), %eax ; \ 163 addl %esi, %eax ; \ 164 movl %eax, R(physfree) ; \ 165 movl %esi, %edi ; \ 166 movl $((foo)*PAGE_SIZE),%ecx ; \ 167 xorl %eax,%eax ; \ 168 cld ; \ 169 rep ; \ 170 stosb 171 172/* 173 * fillkpt 174 * eax = page frame address 175 * ebx = index into page table 176 * ecx = how many pages to map 177 * base = base address of page dir/table 178 * prot = protection bits 179 */ 180#define fillkpt(base, prot) \ 181 shll $PTESHIFT,%ebx ; \ 182 addl base,%ebx ; \ 183 orl $PG_V,%eax ; \ 184 orl prot,%eax ; \ 1851: movl %eax,(%ebx) ; \ 186 addl $PAGE_SIZE,%eax ; /* increment physical address */ \ 187 addl $PTESIZE,%ebx ; /* next pte */ \ 188 loop 1b 189 190/* 191 * fillkptphys(prot) 192 * eax = physical address 193 * ecx = how many pages to map 194 * prot = protection bits 195 */ 196#define fillkptphys(prot) \ 197 movl %eax, %ebx ; \ 198 shrl $PAGE_SHIFT, %ebx ; \ 199 fillkpt(R(KPTphys), prot) 200 201 .text 202/********************************************************************** 203 * 204 * This is where the bootblocks start us, set the ball rolling... 205 * 206 */ 207NON_GPROF_ENTRY(btext) 208 209#ifdef PC98 210 /* save SYSTEM PARAMETER for resume (NS/T or other) */ 211 movl $0xa1400,%esi 212 movl $R(pc98_system_parameter),%edi 213 movl $0x0240,%ecx 214 cld 215 rep 216 movsb 217#else /* IBM-PC */ 218/* Tell the bios to warmboot next time */ 219 movw $0x1234,0x472 220#endif /* PC98 */ 221 222/* Set up a real frame in case the double return in newboot is executed. */ 223 pushl %ebp 224 movl %esp, %ebp 225 226/* Don't trust what the BIOS gives for eflags. */ 227 pushl $PSL_KERNEL 228 popfl 229 230/* 231 * Don't trust what the BIOS gives for %fs and %gs. Trust the bootstrap 232 * to set %cs, %ds, %es and %ss. 233 */ 234 mov %ds, %ax 235 mov %ax, %fs 236 mov %ax, %gs 237 238/* 239 * Clear the bss. Not all boot programs do it, and it is our job anyway. 240 * 241 * XXX we don't check that there is memory for our bss and page tables 242 * before using it. 243 * 244 * Note: we must be careful to not overwrite an active gdt or idt. They 245 * inactive from now until we switch to new ones, since we don't load any 246 * more segment registers or permit interrupts until after the switch. 247 */ 248 movl $R(end),%ecx 249 movl $R(edata),%edi 250 subl %edi,%ecx 251 xorl %eax,%eax 252 cld 253 rep 254 stosb 255 256 call recover_bootinfo 257 258/* Get onto a stack that we can trust. */ 259/* 260 * XXX this step is delayed in case recover_bootinfo needs to return via 261 * the old stack, but it need not be, since recover_bootinfo actually 262 * returns via the old frame. 263 */ 264 movl $R(tmpstk),%esp 265 266#ifdef PC98 267 /* pc98_machine_type & M_EPSON_PC98 */ 268 testb $0x02,R(pc98_system_parameter)+220 269 jz 3f 270 /* epson_machine_id <= 0x0b */ 271 cmpb $0x0b,R(pc98_system_parameter)+224 272 ja 3f 273 274 /* count up memory */ 275 movl $0x100000,%eax /* next, talley remaining memory */ 276 movl $0xFFF-0x100,%ecx 2771: movl 0(%eax),%ebx /* save location to check */ 278 movl $0xa55a5aa5,0(%eax) /* write test pattern */ 279 cmpl $0xa55a5aa5,0(%eax) /* does not check yet for rollover */ 280 jne 2f 281 movl %ebx,0(%eax) /* restore memory */ 282 addl $PAGE_SIZE,%eax 283 loop 1b 2842: subl $0x100000,%eax 285 shrl $17,%eax 286 movb %al,R(pc98_system_parameter)+1 2873: 288 289 movw R(pc98_system_parameter+0x86),%ax 290 movw %ax,R(cpu_id) 291#endif 292 293 call identify_cpu 294 call create_pagetables 295 296/* 297 * If the CPU has support for VME, turn it on. 298 */ 299 testl $CPUID_VME, R(cpu_feature) 300 jz 1f 301 movl %cr4, %eax 302 orl $CR4_VME, %eax 303 movl %eax, %cr4 3041: 305 306/* Now enable paging */ 307#ifdef PAE 308 movl R(IdlePDPT), %eax 309 movl %eax, %cr3 310 movl %cr4, %eax 311 orl $CR4_PAE, %eax 312 movl %eax, %cr4 313#else 314 movl R(IdlePTD), %eax 315 movl %eax,%cr3 /* load ptd addr into mmu */ 316#endif 317 movl %cr0,%eax /* get control word */ 318 orl $CR0_PE|CR0_PG,%eax /* enable paging */ 319 movl %eax,%cr0 /* and let's page NOW! */ 320 321 pushl $begin /* jump to high virtualized address */ 322 ret 323 324/* now running relocated at KERNBASE where the system is linked to run */ 325begin: 326 /* set up bootstrap stack */ 327 movl proc0kstack,%eax /* location of in-kernel stack */ 328 /* bootstrap stack end location */ 329 leal (KSTACK_PAGES*PAGE_SIZE-PCB_SIZE)(%eax),%esp 330 331 xorl %ebp,%ebp /* mark end of frames */ 332 333#ifdef PAE 334 movl IdlePDPT,%esi 335#else 336 movl IdlePTD,%esi 337#endif 338 movl %esi,(KSTACK_PAGES*PAGE_SIZE-PCB_SIZE+PCB_CR3)(%eax) 339 340 pushl physfree /* value of first for init386(first) */ 341 call init386 /* wire 386 chip for unix operation */ 342 343 /* 344 * Clean up the stack in a way that db_numargs() understands, so 345 * that backtraces in ddb don't underrun the stack. Traps for 346 * inaccessible memory are more fatal than usual this early. 347 */ 348 addl $4,%esp 349 350 call mi_startup /* autoconfiguration, mountroot etc */ 351 /* NOTREACHED */ 352 addl $0,%esp /* for db_numargs() again */ 353 354/* 355 * Signal trampoline, copied to top of user stack 356 */ 357NON_GPROF_ENTRY(sigcode) 358 calll *SIGF_HANDLER(%esp) 359 leal SIGF_UC(%esp),%eax /* get ucontext */ 360 pushl %eax 361 testl $PSL_VM,UC_EFLAGS(%eax) 362 jne 1f 363 movl UC_GS(%eax),%gs /* restore %gs */ 3641: 365 movl $SYS_sigreturn,%eax 366 pushl %eax /* junk to fake return addr. */ 367 int $0x80 /* enter kernel with args */ 368 /* on stack */ 3691: 370 jmp 1b 371 372#ifdef COMPAT_FREEBSD4 373 ALIGN_TEXT 374freebsd4_sigcode: 375 calll *SIGF_HANDLER(%esp) 376 leal SIGF_UC4(%esp),%eax /* get ucontext */ 377 pushl %eax 378 testl $PSL_VM,UC4_EFLAGS(%eax) 379 jne 1f 380 movl UC4_GS(%eax),%gs /* restore %gs */ 3811: 382 movl $344,%eax /* 4.x SYS_sigreturn */ 383 pushl %eax /* junk to fake return addr. */ 384 int $0x80 /* enter kernel with args */ 385 /* on stack */ 3861: 387 jmp 1b 388#endif 389 390#ifdef COMPAT_43 391 ALIGN_TEXT 392osigcode: 393 call *SIGF_HANDLER(%esp) /* call signal handler */ 394 lea SIGF_SC(%esp),%eax /* get sigcontext */ 395 pushl %eax 396 testl $PSL_VM,SC_PS(%eax) 397 jne 9f 398 movl SC_GS(%eax),%gs /* restore %gs */ 3999: 400 movl $103,%eax /* 3.x SYS_sigreturn */ 401 pushl %eax /* junk to fake return addr. */ 402 int $0x80 /* enter kernel with args */ 4030: jmp 0b 404#endif /* COMPAT_43 */ 405 406 ALIGN_TEXT 407esigcode: 408 409 .data 410 .globl szsigcode 411szsigcode: 412 .long esigcode-sigcode 413#ifdef COMPAT_FREEBSD4 414 .globl szfreebsd4_sigcode 415szfreebsd4_sigcode: 416 .long esigcode-freebsd4_sigcode 417#endif 418#ifdef COMPAT_43 419 .globl szosigcode 420szosigcode: 421 .long esigcode-osigcode 422#endif 423 .text 424 425/********************************************************************** 426 * 427 * Recover the bootinfo passed to us from the boot program 428 * 429 */ 430recover_bootinfo: 431 /* 432 * This code is called in different ways depending on what loaded 433 * and started the kernel. This is used to detect how we get the 434 * arguments from the other code and what we do with them. 435 * 436 * Old disk boot blocks: 437 * (*btext)(howto, bootdev, cyloffset, esym); 438 * [return address == 0, and can NOT be returned to] 439 * [cyloffset was not supported by the FreeBSD boot code 440 * and always passed in as 0] 441 * [esym is also known as total in the boot code, and 442 * was never properly supported by the FreeBSD boot code] 443 * 444 * Old diskless netboot code: 445 * (*btext)(0,0,0,0,&nfsdiskless,0,0,0); 446 * [return address != 0, and can NOT be returned to] 447 * If we are being booted by this code it will NOT work, 448 * so we are just going to halt if we find this case. 449 * 450 * New uniform boot code: 451 * (*btext)(howto, bootdev, 0, 0, 0, &bootinfo) 452 * [return address != 0, and can be returned to] 453 * 454 * There may seem to be a lot of wasted arguments in here, but 455 * that is so the newer boot code can still load very old kernels 456 * and old boot code can load new kernels. 457 */ 458 459 /* 460 * The old style disk boot blocks fake a frame on the stack and 461 * did an lret to get here. The frame on the stack has a return 462 * address of 0. 463 */ 464 cmpl $0,4(%ebp) 465 je olddiskboot 466 467 /* 468 * We have some form of return address, so this is either the 469 * old diskless netboot code, or the new uniform code. That can 470 * be detected by looking at the 5th argument, if it is 0 471 * we are being booted by the new uniform boot code. 472 */ 473 cmpl $0,24(%ebp) 474 je newboot 475 476 /* 477 * Seems we have been loaded by the old diskless boot code, we 478 * don't stand a chance of running as the diskless structure 479 * changed considerably between the two, so just halt. 480 */ 481 hlt 482 483 /* 484 * We have been loaded by the new uniform boot code. 485 * Let's check the bootinfo version, and if we do not understand 486 * it we return to the loader with a status of 1 to indicate this error 487 */ 488newboot: 489 movl 28(%ebp),%ebx /* &bootinfo.version */ 490 movl BI_VERSION(%ebx),%eax 491 cmpl $1,%eax /* We only understand version 1 */ 492 je 1f 493 movl $1,%eax /* Return status */ 494 leave 495 /* 496 * XXX this returns to our caller's caller (as is required) since 497 * we didn't set up a frame and our caller did. 498 */ 499 ret 500 5011: 502 /* 503 * If we have a kernelname copy it in 504 */ 505 movl BI_KERNELNAME(%ebx),%esi 506 cmpl $0,%esi 507 je 2f /* No kernelname */ 508 movl $MAXPATHLEN,%ecx /* Brute force!!! */ 509 movl $R(kernelname),%edi 510 cmpb $'/',(%esi) /* Make sure it starts with a slash */ 511 je 1f 512 movb $'/',(%edi) 513 incl %edi 514 decl %ecx 5151: 516 cld 517 rep 518 movsb 519 5202: 521 /* 522 * Determine the size of the boot loader's copy of the bootinfo 523 * struct. This is impossible to do properly because old versions 524 * of the struct don't contain a size field and there are 2 old 525 * versions with the same version number. 526 */ 527 movl $BI_ENDCOMMON,%ecx /* prepare for sizeless version */ 528 testl $RB_BOOTINFO,8(%ebp) /* bi_size (and bootinfo) valid? */ 529 je got_bi_size /* no, sizeless version */ 530 movl BI_SIZE(%ebx),%ecx 531got_bi_size: 532 533 /* 534 * Copy the common part of the bootinfo struct 535 */ 536 movl %ebx,%esi 537 movl $R(bootinfo),%edi 538 cmpl $BOOTINFO_SIZE,%ecx 539 jbe got_common_bi_size 540 movl $BOOTINFO_SIZE,%ecx 541got_common_bi_size: 542 cld 543 rep 544 movsb 545 546#ifdef NFS_ROOT 547#ifndef BOOTP_NFSV3 548 /* 549 * If we have a nfs_diskless structure copy it in 550 */ 551 movl BI_NFS_DISKLESS(%ebx),%esi 552 cmpl $0,%esi 553 je olddiskboot 554 movl $R(nfs_diskless),%edi 555 movl $NFSDISKLESS_SIZE,%ecx 556 cld 557 rep 558 movsb 559 movl $R(nfs_diskless_valid),%edi 560 movl $1,(%edi) 561#endif 562#endif 563 564 /* 565 * The old style disk boot. 566 * (*btext)(howto, bootdev, cyloffset, esym); 567 * Note that the newer boot code just falls into here to pick 568 * up howto and bootdev, cyloffset and esym are no longer used 569 */ 570olddiskboot: 571 movl 8(%ebp),%eax 572 movl %eax,R(boothowto) 573 movl 12(%ebp),%eax 574 movl %eax,R(bootdev) 575 576 ret 577 578 579/********************************************************************** 580 * 581 * Identify the CPU and initialize anything special about it 582 * 583 */ 584identify_cpu: 585 586 /* Try to toggle alignment check flag; does not exist on 386. */ 587 pushfl 588 popl %eax 589 movl %eax,%ecx 590 orl $PSL_AC,%eax 591 pushl %eax 592 popfl 593 pushfl 594 popl %eax 595 xorl %ecx,%eax 596 andl $PSL_AC,%eax 597 pushl %ecx 598 popfl 599 600 testl %eax,%eax 601 jnz try486 602 603 /* NexGen CPU does not have aligment check flag. */ 604 pushfl 605 movl $0x5555, %eax 606 xorl %edx, %edx 607 movl $2, %ecx 608 clc 609 divl %ecx 610 jz trynexgen 611 popfl 612 movl $CPU_386,R(cpu) 613 jmp 3f 614 615trynexgen: 616 popfl 617 movl $CPU_NX586,R(cpu) 618 movl $0x4778654e,R(cpu_vendor) # store vendor string 619 movl $0x72446e65,R(cpu_vendor+4) 620 movl $0x6e657669,R(cpu_vendor+8) 621 movl $0,R(cpu_vendor+12) 622 jmp 3f 623 624try486: /* Try to toggle identification flag; does not exist on early 486s. */ 625 pushfl 626 popl %eax 627 movl %eax,%ecx 628 xorl $PSL_ID,%eax 629 pushl %eax 630 popfl 631 pushfl 632 popl %eax 633 xorl %ecx,%eax 634 andl $PSL_ID,%eax 635 pushl %ecx 636 popfl 637 638 testl %eax,%eax 639 jnz trycpuid 640 movl $CPU_486,R(cpu) 641 642 /* 643 * Check Cyrix CPU 644 * Cyrix CPUs do not change the undefined flags following 645 * execution of the divide instruction which divides 5 by 2. 646 * 647 * Note: CPUID is enabled on M2, so it passes another way. 648 */ 649 pushfl 650 movl $0x5555, %eax 651 xorl %edx, %edx 652 movl $2, %ecx 653 clc 654 divl %ecx 655 jnc trycyrix 656 popfl 657 jmp 3f /* You may use Intel CPU. */ 658 659trycyrix: 660 popfl 661 /* 662 * IBM Bluelighting CPU also doesn't change the undefined flags. 663 * Because IBM doesn't disclose the information for Bluelighting 664 * CPU, we couldn't distinguish it from Cyrix's (including IBM 665 * brand of Cyrix CPUs). 666 */ 667 movl $0x69727943,R(cpu_vendor) # store vendor string 668 movl $0x736e4978,R(cpu_vendor+4) 669 movl $0x64616574,R(cpu_vendor+8) 670 jmp 3f 671 672trycpuid: /* Use the `cpuid' instruction. */ 673 xorl %eax,%eax 674 cpuid # cpuid 0 675 movl %eax,R(cpu_high) # highest capability 676 movl %ebx,R(cpu_vendor) # store vendor string 677 movl %edx,R(cpu_vendor+4) 678 movl %ecx,R(cpu_vendor+8) 679 movb $0,R(cpu_vendor+12) 680 681 movl $1,%eax 682 cpuid # cpuid 1 683 movl %eax,R(cpu_id) # store cpu_id 684 movl %ebx,R(cpu_procinfo) # store cpu_procinfo 685 movl %edx,R(cpu_feature) # store cpu_feature 686 rorl $8,%eax # extract family type 687 andl $15,%eax 688 cmpl $5,%eax 689 jae 1f 690 691 /* less than Pentium; must be 486 */ 692 movl $CPU_486,R(cpu) 693 jmp 3f 6941: 695 /* a Pentium? */ 696 cmpl $5,%eax 697 jne 2f 698 movl $CPU_586,R(cpu) 699 jmp 3f 7002: 701 /* Greater than Pentium...call it a Pentium Pro */ 702 movl $CPU_686,R(cpu) 7033: 704 ret 705 706 707/********************************************************************** 708 * 709 * Create the first page directory and its page tables. 710 * 711 */ 712 713create_pagetables: 714 715/* Find end of kernel image (rounded up to a page boundary). */ 716 movl $R(_end),%esi 717 718/* Include symbols, if any. */ 719 movl R(bootinfo+BI_ESYMTAB),%edi 720 testl %edi,%edi 721 je over_symalloc 722 movl %edi,%esi 723 movl $KERNBASE,%edi 724 addl %edi,R(bootinfo+BI_SYMTAB) 725 addl %edi,R(bootinfo+BI_ESYMTAB) 726over_symalloc: 727 728/* If we are told where the end of the kernel space is, believe it. */ 729 movl R(bootinfo+BI_KERNEND),%edi 730 testl %edi,%edi 731 je no_kernend 732 movl %edi,%esi 733no_kernend: 734 735 addl $PAGE_MASK,%esi 736 andl $~PAGE_MASK,%esi 737 movl %esi,R(KERNend) /* save end of kernel */ 738 movl %esi,R(physfree) /* next free page is at end of kernel */ 739 740/* Allocate Kernel Page Tables */ 741 ALLOCPAGES(NKPT) 742 movl %esi,R(KPTphys) 743 744/* Allocate Page Table Directory */ 745#ifdef PAE 746 /* XXX only need 32 bytes (easier for now) */ 747 ALLOCPAGES(1) 748 movl %esi,R(IdlePDPT) 749#endif 750 ALLOCPAGES(NPGPTD) 751 movl %esi,R(IdlePTD) 752 753/* Allocate UPAGES */ 754 ALLOCPAGES(UAREA_PAGES) 755 movl %esi,R(p0upa) 756 addl $KERNBASE, %esi 757 movl %esi, R(proc0uarea) 758 759 ALLOCPAGES(KSTACK_PAGES) 760 movl %esi,R(p0kpa) 761 addl $KERNBASE, %esi 762 movl %esi, R(proc0kstack) 763 764 ALLOCPAGES(1) /* vm86/bios stack */ 765 movl %esi,R(vm86phystk) 766 767 ALLOCPAGES(3) /* pgtable + ext + IOPAGES */ 768 movl %esi,R(vm86pa) 769 addl $KERNBASE, %esi 770 movl %esi, R(vm86paddr) 771 772#ifdef SMP 773/* Allocate cpu0's private data page */ 774 ALLOCPAGES(1) 775 movl %esi,R(cpu0pp) 776 addl $KERNBASE, %esi 777 movl %esi, R(cpu0prvpage) /* relocated to KVM space */ 778 779/* Allocate SMP page table page */ 780 ALLOCPAGES(1) 781 movl %esi,R(SMPptpa) 782 addl $KERNBASE, %esi 783 movl %esi, R(SMPpt) /* relocated to KVM space */ 784#endif /* SMP */ 785 786/* Map read-only from zero to the end of the kernel text section */ 787 xorl %eax, %eax 788 xorl %edx,%edx 789 movl $R(etext),%ecx 790 addl $PAGE_MASK,%ecx 791 shrl $PAGE_SHIFT,%ecx 792 fillkptphys(%edx) 793 794/* Map read-write, data, bss and symbols */ 795 movl $R(etext),%eax 796 addl $PAGE_MASK, %eax 797 andl $~PAGE_MASK, %eax 798 movl $PG_RW,%edx 799 movl R(KERNend),%ecx 800 subl %eax,%ecx 801 shrl $PAGE_SHIFT,%ecx 802 fillkptphys(%edx) 803 804/* Map page directory. */ 805#ifdef PAE 806 movl R(IdlePDPT), %eax 807 movl $1, %ecx 808 fillkptphys($PG_RW) 809#endif 810 811 movl R(IdlePTD), %eax 812 movl $NPGPTD, %ecx 813 fillkptphys($PG_RW) 814 815/* Map proc0's UPAGES in the physical way ... */ 816 movl R(p0upa), %eax 817 movl $(UAREA_PAGES), %ecx 818 fillkptphys($PG_RW) 819 820/* Map proc0's KSTACK in the physical way ... */ 821 movl R(p0kpa), %eax 822 movl $(KSTACK_PAGES), %ecx 823 fillkptphys($PG_RW) 824 825/* Map ISA hole */ 826 movl $ISA_HOLE_START, %eax 827 movl $ISA_HOLE_LENGTH>>PAGE_SHIFT, %ecx 828 fillkptphys($PG_RW) 829 830/* Map space for the vm86 region */ 831 movl R(vm86phystk), %eax 832 movl $4, %ecx 833 fillkptphys($PG_RW) 834 835/* Map page 0 into the vm86 page table */ 836 movl $0, %eax 837 movl $0, %ebx 838 movl $1, %ecx 839 fillkpt(R(vm86pa), $PG_RW|PG_U) 840 841/* ...likewise for the ISA hole */ 842 movl $ISA_HOLE_START, %eax 843 movl $ISA_HOLE_START>>PAGE_SHIFT, %ebx 844 movl $ISA_HOLE_LENGTH>>PAGE_SHIFT, %ecx 845 fillkpt(R(vm86pa), $PG_RW|PG_U) 846 847#ifdef SMP 848/* Map cpu0's private page into global kmem (4K @ cpu0prvpage) */ 849 movl R(cpu0pp), %eax 850 movl $1, %ecx 851 fillkptphys($PG_RW) 852 853/* Map SMP page table page into global kmem FWIW */ 854 movl R(SMPptpa), %eax 855 movl $1, %ecx 856 fillkptphys($PG_RW) 857 858/* Map the private page into the SMP page table */ 859 movl R(cpu0pp), %eax 860 movl $0, %ebx /* pte offset = 0 */ 861 movl $1, %ecx /* one private page coming right up */ 862 fillkpt(R(SMPptpa), $PG_RW) 863 864/* ... and put the page table table in the pde. */ 865 movl R(SMPptpa), %eax 866 movl $MPPTDI, %ebx 867 movl $1, %ecx 868 fillkpt(R(IdlePTD), $PG_RW) 869 870/* Fakeup VA for the local apic to allow early traps. */ 871 ALLOCPAGES(1) 872 movl %esi, %eax 873 movl $(NPTEPG-1), %ebx /* pte offset = NTEPG-1 */ 874 movl $1, %ecx /* one private pt coming right up */ 875 fillkpt(R(SMPptpa), $PG_RW) 876#endif /* SMP */ 877 878/* install a pde for temporary double map of bottom of VA */ 879 movl R(KPTphys), %eax 880 xorl %ebx, %ebx 881 movl $NKPT, %ecx 882 fillkpt(R(IdlePTD), $PG_RW) 883 884/* install pde's for pt's */ 885 movl R(KPTphys), %eax 886 movl $KPTDI, %ebx 887 movl $NKPT, %ecx 888 fillkpt(R(IdlePTD), $PG_RW) 889 890/* install a pde recursively mapping page directory as a page table */ 891 movl R(IdlePTD), %eax 892 movl $PTDPTDI, %ebx 893 movl $NPGPTD,%ecx 894 fillkpt(R(IdlePTD), $PG_RW) 895 896#ifdef PAE 897 movl R(IdlePTD), %eax 898 xorl %ebx, %ebx 899 movl $NPGPTD, %ecx 900 fillkpt(R(IdlePDPT), $0x0) 901#endif 902 903 ret 904