locore.s revision 117459
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 117459 2003-07-11 21:39:25Z peter $ 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 */ 103HIDENAME(tmpstk): 104 105 .globl bootinfo 106bootinfo: .space BOOTINFO_SIZE /* bootinfo that we can handle */ 107 108 .globl KERNend 109KERNend: .long 0 /* phys addr end of kernel (just after bss) */ 110physfree: .long 0 /* phys addr of next free page */ 111 112#ifdef SMP 113 .globl cpu0prvpage 114cpu0pp: .long 0 /* phys addr cpu0 private pg */ 115cpu0prvpage: .long 0 /* relocated version */ 116 117 .globl SMPpt 118SMPptpa: .long 0 /* phys addr SMP page table */ 119SMPpt: .long 0 /* relocated version */ 120#endif /* SMP */ 121 122 .globl IdlePTD 123IdlePTD: .long 0 /* phys addr of kernel PTD */ 124 125#ifdef PAE 126 .globl IdlePDPT 127IdlePDPT: .long 0 /* phys addr of kernel PDPT */ 128#endif 129 130#ifdef SMP 131 .globl KPTphys 132#endif 133KPTphys: .long 0 /* phys addr of kernel page tables */ 134 135 .globl proc0uarea, proc0kstack 136proc0uarea: .long 0 /* address of proc 0 uarea space */ 137proc0kstack: .long 0 /* address of proc 0 kstack space */ 138p0upa: .long 0 /* phys addr of proc0's UAREA */ 139p0kpa: .long 0 /* phys addr of proc0's STACK */ 140 141vm86phystk: .long 0 /* PA of vm86/bios stack */ 142 143 .globl vm86paddr, vm86pa 144vm86paddr: .long 0 /* address of vm86 region */ 145vm86pa: .long 0 /* phys addr of vm86 region */ 146 147#ifdef PC98 148 .globl pc98_system_parameter 149pc98_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 ; \ 1861: 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 */ 208NON_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 2601: 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 2672: subl $0x100000,%eax 268 shrl $17,%eax 269 movb %al,R(pc98_system_parameter)+1 2703: 271 272 movw R(pc98_system_parameter+0x86),%ax 273 movw %ax,R(cpu_id) 274#endif 275 276 call identify_cpu 277 278/* 279 * We used to clear BSS here, but it isn't needed anymore and actually 280 * causes harm. gcc now optimizes 'int foo = 0' to be uninitialized in 281 * the bss. All the supported loaders already zero the bss. The a.out 282 * kgzip case does not, but we do not generate a.out kernels anymore. 283 * This is trivial to fix anyway, is a bug in kgzip. 284 */ 285 286 call create_pagetables 287 288/* 289 * If the CPU has support for VME, turn it on. 290 */ 291 testl $CPUID_VME, R(cpu_feature) 292 jz 1f 293 movl %cr4, %eax 294 orl $CR4_VME, %eax 295 movl %eax, %cr4 2961: 297 298/* Now enable paging */ 299#ifdef PAE 300 movl R(IdlePDPT), %eax 301 movl %eax, %cr3 302 movl %cr4, %eax 303 orl $CR4_PAE, %eax 304 movl %eax, %cr4 305#else 306 movl R(IdlePTD), %eax 307 movl %eax,%cr3 /* load ptd addr into mmu */ 308#endif 309 movl %cr0,%eax /* get control word */ 310 orl $CR0_PE|CR0_PG,%eax /* enable paging */ 311 movl %eax,%cr0 /* and let's page NOW! */ 312 313 pushl $begin /* jump to high virtualized address */ 314 ret 315 316/* now running relocated at KERNBASE where the system is linked to run */ 317begin: 318 /* set up bootstrap stack */ 319 movl proc0kstack,%eax /* location of in-kernel stack */ 320 /* bootstrap stack end location */ 321 leal (KSTACK_PAGES*PAGE_SIZE-PCB_SIZE)(%eax),%esp 322 323 xorl %ebp,%ebp /* mark end of frames */ 324 325#ifdef PAE 326 movl IdlePDPT,%esi 327#else 328 movl IdlePTD,%esi 329#endif 330 movl %esi,(KSTACK_PAGES*PAGE_SIZE-PCB_SIZE+PCB_CR3)(%eax) 331 332 pushl physfree /* value of first for init386(first) */ 333 call init386 /* wire 386 chip for unix operation */ 334 335 /* 336 * Clean up the stack in a way that db_numargs() understands, so 337 * that backtraces in ddb don't underrun the stack. Traps for 338 * inaccessible memory are more fatal than usual this early. 339 */ 340 addl $4,%esp 341 342 call mi_startup /* autoconfiguration, mountroot etc */ 343 /* NOTREACHED */ 344 addl $0,%esp /* for db_numargs() again */ 345 346/* 347 * Signal trampoline, copied to top of user stack 348 */ 349NON_GPROF_ENTRY(sigcode) 350 calll *SIGF_HANDLER(%esp) 351 leal SIGF_UC(%esp),%eax /* get ucontext */ 352 pushl %eax 353 testl $PSL_VM,UC_EFLAGS(%eax) 354 jne 1f 355 movl UC_GS(%eax),%gs /* restore %gs */ 3561: 357 movl $SYS_sigreturn,%eax 358 pushl %eax /* junk to fake return addr. */ 359 int $0x80 /* enter kernel with args */ 360 /* on stack */ 3611: 362 jmp 1b 363 364#ifdef COMPAT_FREEBSD4 365 ALIGN_TEXT 366freebsd4_sigcode: 367 calll *SIGF_HANDLER(%esp) 368 leal SIGF_UC4(%esp),%eax /* get ucontext */ 369 pushl %eax 370 testl $PSL_VM,UC4_EFLAGS(%eax) 371 jne 1f 372 movl UC4_GS(%eax),%gs /* restore %gs */ 3731: 374 movl $344,%eax /* 4.x SYS_sigreturn */ 375 pushl %eax /* junk to fake return addr. */ 376 int $0x80 /* enter kernel with args */ 377 /* on stack */ 3781: 379 jmp 1b 380#endif 381 382#ifdef COMPAT_43 383 ALIGN_TEXT 384osigcode: 385 call *SIGF_HANDLER(%esp) /* call signal handler */ 386 lea SIGF_SC(%esp),%eax /* get sigcontext */ 387 pushl %eax 388 testl $PSL_VM,SC_PS(%eax) 389 jne 9f 390 movl SC_GS(%eax),%gs /* restore %gs */ 3919: 392 movl $103,%eax /* 3.x SYS_sigreturn */ 393 pushl %eax /* junk to fake return addr. */ 394 int $0x80 /* enter kernel with args */ 3950: jmp 0b 396#endif /* COMPAT_43 */ 397 398 ALIGN_TEXT 399esigcode: 400 401 .data 402 .globl szsigcode 403szsigcode: 404 .long esigcode-sigcode 405#ifdef COMPAT_FREEBSD4 406 .globl szfreebsd4_sigcode 407szfreebsd4_sigcode: 408 .long esigcode-freebsd4_sigcode 409#endif 410#ifdef COMPAT_43 411 .globl szosigcode 412szosigcode: 413 .long esigcode-osigcode 414#endif 415 .text 416 417/********************************************************************** 418 * 419 * Recover the bootinfo passed to us from the boot program 420 * 421 */ 422recover_bootinfo: 423 /* 424 * This code is called in different ways depending on what loaded 425 * and started the kernel. This is used to detect how we get the 426 * arguments from the other code and what we do with them. 427 * 428 * Old disk boot blocks: 429 * (*btext)(howto, bootdev, cyloffset, esym); 430 * [return address == 0, and can NOT be returned to] 431 * [cyloffset was not supported by the FreeBSD boot code 432 * and always passed in as 0] 433 * [esym is also known as total in the boot code, and 434 * was never properly supported by the FreeBSD boot code] 435 * 436 * Old diskless netboot code: 437 * (*btext)(0,0,0,0,&nfsdiskless,0,0,0); 438 * [return address != 0, and can NOT be returned to] 439 * If we are being booted by this code it will NOT work, 440 * so we are just going to halt if we find this case. 441 * 442 * New uniform boot code: 443 * (*btext)(howto, bootdev, 0, 0, 0, &bootinfo) 444 * [return address != 0, and can be returned to] 445 * 446 * There may seem to be a lot of wasted arguments in here, but 447 * that is so the newer boot code can still load very old kernels 448 * and old boot code can load new kernels. 449 */ 450 451 /* 452 * The old style disk boot blocks fake a frame on the stack and 453 * did an lret to get here. The frame on the stack has a return 454 * address of 0. 455 */ 456 cmpl $0,4(%ebp) 457 je olddiskboot 458 459 /* 460 * We have some form of return address, so this is either the 461 * old diskless netboot code, or the new uniform code. That can 462 * be detected by looking at the 5th argument, if it is 0 463 * we are being booted by the new uniform boot code. 464 */ 465 cmpl $0,24(%ebp) 466 je newboot 467 468 /* 469 * Seems we have been loaded by the old diskless boot code, we 470 * don't stand a chance of running as the diskless structure 471 * changed considerably between the two, so just halt. 472 */ 473 hlt 474 475 /* 476 * We have been loaded by the new uniform boot code. 477 * Let's check the bootinfo version, and if we do not understand 478 * it we return to the loader with a status of 1 to indicate this error 479 */ 480newboot: 481 movl 28(%ebp),%ebx /* &bootinfo.version */ 482 movl BI_VERSION(%ebx),%eax 483 cmpl $1,%eax /* We only understand version 1 */ 484 je 1f 485 movl $1,%eax /* Return status */ 486 leave 487 /* 488 * XXX this returns to our caller's caller (as is required) since 489 * we didn't set up a frame and our caller did. 490 */ 491 ret 492 4931: 494 /* 495 * If we have a kernelname copy it in 496 */ 497 movl BI_KERNELNAME(%ebx),%esi 498 cmpl $0,%esi 499 je 2f /* No kernelname */ 500 movl $MAXPATHLEN,%ecx /* Brute force!!! */ 501 movl $R(kernelname),%edi 502 cmpb $'/',(%esi) /* Make sure it starts with a slash */ 503 je 1f 504 movb $'/',(%edi) 505 incl %edi 506 decl %ecx 5071: 508 cld 509 rep 510 movsb 511 5122: 513 /* 514 * Determine the size of the boot loader's copy of the bootinfo 515 * struct. This is impossible to do properly because old versions 516 * of the struct don't contain a size field and there are 2 old 517 * versions with the same version number. 518 */ 519 movl $BI_ENDCOMMON,%ecx /* prepare for sizeless version */ 520 testl $RB_BOOTINFO,8(%ebp) /* bi_size (and bootinfo) valid? */ 521 je got_bi_size /* no, sizeless version */ 522 movl BI_SIZE(%ebx),%ecx 523got_bi_size: 524 525 /* 526 * Copy the common part of the bootinfo struct 527 */ 528 movl %ebx,%esi 529 movl $R(bootinfo),%edi 530 cmpl $BOOTINFO_SIZE,%ecx 531 jbe got_common_bi_size 532 movl $BOOTINFO_SIZE,%ecx 533got_common_bi_size: 534 cld 535 rep 536 movsb 537 538#ifdef NFS_ROOT 539#ifndef BOOTP_NFSV3 540 /* 541 * If we have a nfs_diskless structure copy it in 542 */ 543 movl BI_NFS_DISKLESS(%ebx),%esi 544 cmpl $0,%esi 545 je olddiskboot 546 movl $R(nfs_diskless),%edi 547 movl $NFSDISKLESS_SIZE,%ecx 548 cld 549 rep 550 movsb 551 movl $R(nfs_diskless_valid),%edi 552 movl $1,(%edi) 553#endif 554#endif 555 556 /* 557 * The old style disk boot. 558 * (*btext)(howto, bootdev, cyloffset, esym); 559 * Note that the newer boot code just falls into here to pick 560 * up howto and bootdev, cyloffset and esym are no longer used 561 */ 562olddiskboot: 563 movl 8(%ebp),%eax 564 movl %eax,R(boothowto) 565 movl 12(%ebp),%eax 566 movl %eax,R(bootdev) 567 568 ret 569 570 571/********************************************************************** 572 * 573 * Identify the CPU and initialize anything special about it 574 * 575 */ 576identify_cpu: 577 578 /* Try to toggle alignment check flag; does not exist on 386. */ 579 pushfl 580 popl %eax 581 movl %eax,%ecx 582 orl $PSL_AC,%eax 583 pushl %eax 584 popfl 585 pushfl 586 popl %eax 587 xorl %ecx,%eax 588 andl $PSL_AC,%eax 589 pushl %ecx 590 popfl 591 592 testl %eax,%eax 593 jnz try486 594 595 /* NexGen CPU does not have aligment check flag. */ 596 pushfl 597 movl $0x5555, %eax 598 xorl %edx, %edx 599 movl $2, %ecx 600 clc 601 divl %ecx 602 jz trynexgen 603 popfl 604 movl $CPU_386,R(cpu) 605 jmp 3f 606 607trynexgen: 608 popfl 609 movl $CPU_NX586,R(cpu) 610 movl $0x4778654e,R(cpu_vendor) # store vendor string 611 movl $0x72446e65,R(cpu_vendor+4) 612 movl $0x6e657669,R(cpu_vendor+8) 613 movl $0,R(cpu_vendor+12) 614 jmp 3f 615 616try486: /* Try to toggle identification flag; does not exist on early 486s. */ 617 pushfl 618 popl %eax 619 movl %eax,%ecx 620 xorl $PSL_ID,%eax 621 pushl %eax 622 popfl 623 pushfl 624 popl %eax 625 xorl %ecx,%eax 626 andl $PSL_ID,%eax 627 pushl %ecx 628 popfl 629 630 testl %eax,%eax 631 jnz trycpuid 632 movl $CPU_486,R(cpu) 633 634 /* 635 * Check Cyrix CPU 636 * Cyrix CPUs do not change the undefined flags following 637 * execution of the divide instruction which divides 5 by 2. 638 * 639 * Note: CPUID is enabled on M2, so it passes another way. 640 */ 641 pushfl 642 movl $0x5555, %eax 643 xorl %edx, %edx 644 movl $2, %ecx 645 clc 646 divl %ecx 647 jnc trycyrix 648 popfl 649 jmp 3f /* You may use Intel CPU. */ 650 651trycyrix: 652 popfl 653 /* 654 * IBM Bluelighting CPU also doesn't change the undefined flags. 655 * Because IBM doesn't disclose the information for Bluelighting 656 * CPU, we couldn't distinguish it from Cyrix's (including IBM 657 * brand of Cyrix CPUs). 658 */ 659 movl $0x69727943,R(cpu_vendor) # store vendor string 660 movl $0x736e4978,R(cpu_vendor+4) 661 movl $0x64616574,R(cpu_vendor+8) 662 jmp 3f 663 664trycpuid: /* Use the `cpuid' instruction. */ 665 xorl %eax,%eax 666 cpuid # cpuid 0 667 movl %eax,R(cpu_high) # highest capability 668 movl %ebx,R(cpu_vendor) # store vendor string 669 movl %edx,R(cpu_vendor+4) 670 movl %ecx,R(cpu_vendor+8) 671 movb $0,R(cpu_vendor+12) 672 673 movl $1,%eax 674 cpuid # cpuid 1 675 movl %eax,R(cpu_id) # store cpu_id 676 movl %ebx,R(cpu_procinfo) # store cpu_procinfo 677 movl %edx,R(cpu_feature) # store cpu_feature 678 rorl $8,%eax # extract family type 679 andl $15,%eax 680 cmpl $5,%eax 681 jae 1f 682 683 /* less than Pentium; must be 486 */ 684 movl $CPU_486,R(cpu) 685 jmp 3f 6861: 687 /* a Pentium? */ 688 cmpl $5,%eax 689 jne 2f 690 movl $CPU_586,R(cpu) 691 jmp 3f 6922: 693 /* Greater than Pentium...call it a Pentium Pro */ 694 movl $CPU_686,R(cpu) 6953: 696 ret 697 698 699/********************************************************************** 700 * 701 * Create the first page directory and its page tables. 702 * 703 */ 704 705create_pagetables: 706 707/* Find end of kernel image (rounded up to a page boundary). */ 708 movl $R(_end),%esi 709 710/* Include symbols, if any. */ 711 movl R(bootinfo+BI_ESYMTAB),%edi 712 testl %edi,%edi 713 je over_symalloc 714 movl %edi,%esi 715 movl $KERNBASE,%edi 716 addl %edi,R(bootinfo+BI_SYMTAB) 717 addl %edi,R(bootinfo+BI_ESYMTAB) 718over_symalloc: 719 720/* If we are told where the end of the kernel space is, believe it. */ 721 movl R(bootinfo+BI_KERNEND),%edi 722 testl %edi,%edi 723 je no_kernend 724 movl %edi,%esi 725no_kernend: 726 727 addl $PAGE_MASK,%esi 728 andl $~PAGE_MASK,%esi 729 movl %esi,R(KERNend) /* save end of kernel */ 730 movl %esi,R(physfree) /* next free page is at end of kernel */ 731 732/* Allocate Kernel Page Tables */ 733 ALLOCPAGES(NKPT) 734 movl %esi,R(KPTphys) 735 736/* Allocate Page Table Directory */ 737#ifdef PAE 738 /* XXX only need 32 bytes (easier for now) */ 739 ALLOCPAGES(1) 740 movl %esi,R(IdlePDPT) 741#endif 742 ALLOCPAGES(NPGPTD) 743 movl %esi,R(IdlePTD) 744 745/* Allocate UPAGES */ 746 ALLOCPAGES(UAREA_PAGES) 747 movl %esi,R(p0upa) 748 addl $KERNBASE, %esi 749 movl %esi, R(proc0uarea) 750 751 ALLOCPAGES(KSTACK_PAGES) 752 movl %esi,R(p0kpa) 753 addl $KERNBASE, %esi 754 movl %esi, R(proc0kstack) 755 756 ALLOCPAGES(1) /* vm86/bios stack */ 757 movl %esi,R(vm86phystk) 758 759 ALLOCPAGES(3) /* pgtable + ext + IOPAGES */ 760 movl %esi,R(vm86pa) 761 addl $KERNBASE, %esi 762 movl %esi, R(vm86paddr) 763 764#ifdef SMP 765/* Allocate cpu0's private data page */ 766 ALLOCPAGES(1) 767 movl %esi,R(cpu0pp) 768 addl $KERNBASE, %esi 769 movl %esi, R(cpu0prvpage) /* relocated to KVM space */ 770 771/* Allocate SMP page table page */ 772 ALLOCPAGES(1) 773 movl %esi,R(SMPptpa) 774 addl $KERNBASE, %esi 775 movl %esi, R(SMPpt) /* relocated to KVM space */ 776#endif /* SMP */ 777 778/* Map read-only from zero to the end of the kernel text section */ 779 xorl %eax, %eax 780 xorl %edx,%edx 781 movl $R(etext),%ecx 782 addl $PAGE_MASK,%ecx 783 shrl $PAGE_SHIFT,%ecx 784 fillkptphys(%edx) 785 786/* Map read-write, data, bss and symbols */ 787 movl $R(etext),%eax 788 addl $PAGE_MASK, %eax 789 andl $~PAGE_MASK, %eax 790 movl $PG_RW,%edx 791 movl R(KERNend),%ecx 792 subl %eax,%ecx 793 shrl $PAGE_SHIFT,%ecx 794 fillkptphys(%edx) 795 796/* Map page directory. */ 797#ifdef PAE 798 movl R(IdlePDPT), %eax 799 movl $1, %ecx 800 fillkptphys($PG_RW) 801#endif 802 803 movl R(IdlePTD), %eax 804 movl $NPGPTD, %ecx 805 fillkptphys($PG_RW) 806 807/* Map proc0's UPAGES in the physical way ... */ 808 movl R(p0upa), %eax 809 movl $(UAREA_PAGES), %ecx 810 fillkptphys($PG_RW) 811 812/* Map proc0's KSTACK in the physical way ... */ 813 movl R(p0kpa), %eax 814 movl $(KSTACK_PAGES), %ecx 815 fillkptphys($PG_RW) 816 817/* Map ISA hole */ 818 movl $ISA_HOLE_START, %eax 819 movl $ISA_HOLE_LENGTH>>PAGE_SHIFT, %ecx 820 fillkptphys($PG_RW) 821 822/* Map space for the vm86 region */ 823 movl R(vm86phystk), %eax 824 movl $4, %ecx 825 fillkptphys($PG_RW) 826 827/* Map page 0 into the vm86 page table */ 828 movl $0, %eax 829 movl $0, %ebx 830 movl $1, %ecx 831 fillkpt(R(vm86pa), $PG_RW|PG_U) 832 833/* ...likewise for the ISA hole */ 834 movl $ISA_HOLE_START, %eax 835 movl $ISA_HOLE_START>>PAGE_SHIFT, %ebx 836 movl $ISA_HOLE_LENGTH>>PAGE_SHIFT, %ecx 837 fillkpt(R(vm86pa), $PG_RW|PG_U) 838 839#ifdef SMP 840/* Map cpu0's private page into global kmem (4K @ cpu0prvpage) */ 841 movl R(cpu0pp), %eax 842 movl $1, %ecx 843 fillkptphys($PG_RW) 844 845/* Map SMP page table page into global kmem FWIW */ 846 movl R(SMPptpa), %eax 847 movl $1, %ecx 848 fillkptphys($PG_RW) 849 850/* Map the private page into the SMP page table */ 851 movl R(cpu0pp), %eax 852 movl $0, %ebx /* pte offset = 0 */ 853 movl $1, %ecx /* one private page coming right up */ 854 fillkpt(R(SMPptpa), $PG_RW) 855 856/* ... and put the page table table in the pde. */ 857 movl R(SMPptpa), %eax 858 movl $MPPTDI, %ebx 859 movl $1, %ecx 860 fillkpt(R(IdlePTD), $PG_RW) 861 862/* Fakeup VA for the local apic to allow early traps. */ 863 ALLOCPAGES(1) 864 movl %esi, %eax 865 movl $(NPTEPG-1), %ebx /* pte offset = NTEPG-1 */ 866 movl $1, %ecx /* one private pt coming right up */ 867 fillkpt(R(SMPptpa), $PG_RW) 868#endif /* SMP */ 869 870/* install a pde for temporary double map of bottom of VA */ 871 movl R(KPTphys), %eax 872 xorl %ebx, %ebx 873 movl $NKPT, %ecx 874 fillkpt(R(IdlePTD), $PG_RW) 875 876/* install pde's for pt's */ 877 movl R(KPTphys), %eax 878 movl $KPTDI, %ebx 879 movl $NKPT, %ecx 880 fillkpt(R(IdlePTD), $PG_RW) 881 882/* install a pde recursively mapping page directory as a page table */ 883 movl R(IdlePTD), %eax 884 movl $PTDPTDI, %ebx 885 movl $NPGPTD,%ecx 886 fillkpt(R(IdlePTD), $PG_RW) 887 888#ifdef PAE 889 movl R(IdlePTD), %eax 890 xorl %ebx, %ebx 891 movl $NPGPTD, %ecx 892 fillkpt(R(IdlePDPT), $0x0) 893#endif 894 895 ret 896