locore.s revision 120690
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 120690 2003-10-03 14:33:00Z 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#include "opt_pmap.h" 50 51#include <sys/syscall.h> 52#include <sys/reboot.h> 53 54#include <machine/asmacros.h> 55#include <machine/cputypes.h> 56#include <machine/psl.h> 57#include <machine/pmap.h> 58#include <machine/specialreg.h> 59 60#include "assym.s" 61 62/* 63 * XXX 64 * 65 * Note: This version greatly munged to avoid various assembler errors 66 * that may be fixed in newer versions of gas. Perhaps newer versions 67 * will have more pleasant appearance. 68 */ 69 70/* 71 * PTmap is recursive pagemap at top of virtual address space. 72 * Within PTmap, the page directory can be found (third indirection). 73 */ 74 .globl PTmap,PTD,PTDpde 75 .set PTmap,(PTDPTDI << PDRSHIFT) 76 .set PTD,PTmap + (PTDPTDI * PAGE_SIZE) 77 .set PTDpde,PTD + (PTDPTDI * PDESIZE) 78 79#ifdef SMP 80/* 81 * Define layout of per-cpu address space. 82 * This is "constructed" in locore.s on the BSP and in mp_machdep.c 83 * for each AP. DO NOT REORDER THESE WITHOUT UPDATING THE REST! 84 */ 85 .globl SMP_prvspace, lapic 86 .set SMP_prvspace,(MPPTDI << PDRSHIFT) 87 .set lapic,SMP_prvspace + (NPTEPG-1) * PAGE_SIZE 88#endif /* SMP */ 89 90/* 91 * Compiled KERNBASE location and the kernel load address 92 */ 93 .globl kernbase 94 .set kernbase,KERNBASE 95 .globl kernload 96 .set kernload,KERNLOAD 97 98/* 99 * Globals 100 */ 101 .data 102 ALIGN_DATA /* just to be sure */ 103 104 .space 0x2000 /* space for tmpstk - temporary stack */ 105tmpstk: 106 107 .globl bootinfo 108bootinfo: .space BOOTINFO_SIZE /* bootinfo that we can handle */ 109 110 .globl KERNend 111KERNend: .long 0 /* phys addr end of kernel (just after bss) */ 112physfree: .long 0 /* phys addr of next free page */ 113 114#ifdef SMP 115 .globl cpu0prvpage 116cpu0pp: .long 0 /* phys addr cpu0 private pg */ 117cpu0prvpage: .long 0 /* relocated version */ 118 119 .globl SMPpt 120SMPptpa: .long 0 /* phys addr SMP page table */ 121SMPpt: .long 0 /* relocated version */ 122#endif /* SMP */ 123 124 .globl IdlePTD 125IdlePTD: .long 0 /* phys addr of kernel PTD */ 126 127#ifdef PAE 128 .globl IdlePDPT 129IdlePDPT: .long 0 /* phys addr of kernel PDPT */ 130#endif 131 132#ifdef SMP 133 .globl KPTphys 134#endif 135KPTphys: .long 0 /* phys addr of kernel page tables */ 136 137 .globl proc0uarea, proc0kstack 138proc0uarea: .long 0 /* address of proc 0 uarea space */ 139proc0kstack: .long 0 /* address of proc 0 kstack space */ 140p0upa: .long 0 /* phys addr of proc0's UAREA */ 141p0kpa: .long 0 /* phys addr of proc0's STACK */ 142 143vm86phystk: .long 0 /* PA of vm86/bios stack */ 144 145 .globl vm86paddr, vm86pa 146vm86paddr: .long 0 /* address of vm86 region */ 147vm86pa: .long 0 /* phys addr of vm86 region */ 148 149#ifdef PC98 150 .globl pc98_system_parameter 151pc98_system_parameter: 152 .space 0x240 153#endif 154 155/********************************************************************** 156 * 157 * Some handy macros 158 * 159 */ 160 161#define R(foo) ((foo)-KERNBASE) 162 163#define ALLOCPAGES(foo) \ 164 movl R(physfree), %esi ; \ 165 movl $((foo)*PAGE_SIZE), %eax ; \ 166 addl %esi, %eax ; \ 167 movl %eax, R(physfree) ; \ 168 movl %esi, %edi ; \ 169 movl $((foo)*PAGE_SIZE),%ecx ; \ 170 xorl %eax,%eax ; \ 171 cld ; \ 172 rep ; \ 173 stosb 174 175/* 176 * fillkpt 177 * eax = page frame address 178 * ebx = index into page table 179 * ecx = how many pages to map 180 * base = base address of page dir/table 181 * prot = protection bits 182 */ 183#define fillkpt(base, prot) \ 184 shll $PTESHIFT,%ebx ; \ 185 addl base,%ebx ; \ 186 orl $PG_V,%eax ; \ 187 orl prot,%eax ; \ 1881: movl %eax,(%ebx) ; \ 189 addl $PAGE_SIZE,%eax ; /* increment physical address */ \ 190 addl $PTESIZE,%ebx ; /* next pte */ \ 191 loop 1b 192 193/* 194 * fillkptphys(prot) 195 * eax = physical address 196 * ecx = how many pages to map 197 * prot = protection bits 198 */ 199#define fillkptphys(prot) \ 200 movl %eax, %ebx ; \ 201 shrl $PAGE_SHIFT, %ebx ; \ 202 fillkpt(R(KPTphys), prot) 203 204 .text 205/********************************************************************** 206 * 207 * This is where the bootblocks start us, set the ball rolling... 208 * 209 */ 210NON_GPROF_ENTRY(btext) 211 212#ifdef PC98 213 /* save SYSTEM PARAMETER for resume (NS/T or other) */ 214 movl $0xa1400,%esi 215 movl $R(pc98_system_parameter),%edi 216 movl $0x0240,%ecx 217 cld 218 rep 219 movsb 220#else /* IBM-PC */ 221/* Tell the bios to warmboot next time */ 222 movw $0x1234,0x472 223#endif /* PC98 */ 224 225/* Set up a real frame in case the double return in newboot is executed. */ 226 pushl %ebp 227 movl %esp, %ebp 228 229/* Don't trust what the BIOS gives for eflags. */ 230 pushl $PSL_KERNEL 231 popfl 232 233/* 234 * Don't trust what the BIOS gives for %fs and %gs. Trust the bootstrap 235 * to set %cs, %ds, %es and %ss. 236 */ 237 mov %ds, %ax 238 mov %ax, %fs 239 mov %ax, %gs 240 241/* 242 * Clear the bss. Not all boot programs do it, and it is our job anyway. 243 * 244 * XXX we don't check that there is memory for our bss and page tables 245 * before using it. 246 * 247 * Note: we must be careful to not overwrite an active gdt or idt. They 248 * inactive from now until we switch to new ones, since we don't load any 249 * more segment registers or permit interrupts until after the switch. 250 */ 251 movl $R(end),%ecx 252 movl $R(edata),%edi 253 subl %edi,%ecx 254 xorl %eax,%eax 255 cld 256 rep 257 stosb 258 259 call recover_bootinfo 260 261/* Get onto a stack that we can trust. */ 262/* 263 * XXX this step is delayed in case recover_bootinfo needs to return via 264 * the old stack, but it need not be, since recover_bootinfo actually 265 * returns via the old frame. 266 */ 267 movl $R(tmpstk),%esp 268 269#ifdef PC98 270 /* pc98_machine_type & M_EPSON_PC98 */ 271 testb $0x02,R(pc98_system_parameter)+220 272 jz 3f 273 /* epson_machine_id <= 0x0b */ 274 cmpb $0x0b,R(pc98_system_parameter)+224 275 ja 3f 276 277 /* count up memory */ 278 movl $0x100000,%eax /* next, talley remaining memory */ 279 movl $0xFFF-0x100,%ecx 2801: movl 0(%eax),%ebx /* save location to check */ 281 movl $0xa55a5aa5,0(%eax) /* write test pattern */ 282 cmpl $0xa55a5aa5,0(%eax) /* does not check yet for rollover */ 283 jne 2f 284 movl %ebx,0(%eax) /* restore memory */ 285 addl $PAGE_SIZE,%eax 286 loop 1b 2872: subl $0x100000,%eax 288 shrl $17,%eax 289 movb %al,R(pc98_system_parameter)+1 2903: 291 292 movw R(pc98_system_parameter+0x86),%ax 293 movw %ax,R(cpu_id) 294#endif 295 296 call identify_cpu 297 call create_pagetables 298 299/* 300 * If the CPU has support for VME, turn it on. 301 */ 302 testl $CPUID_VME, R(cpu_feature) 303 jz 1f 304 movl %cr4, %eax 305 orl $CR4_VME, %eax 306 movl %eax, %cr4 3071: 308 309/* Now enable paging */ 310#ifdef PAE 311 movl R(IdlePDPT), %eax 312 movl %eax, %cr3 313 movl %cr4, %eax 314 orl $CR4_PAE, %eax 315 movl %eax, %cr4 316#else 317 movl R(IdlePTD), %eax 318 movl %eax,%cr3 /* load ptd addr into mmu */ 319#endif 320 movl %cr0,%eax /* get control word */ 321 orl $CR0_PE|CR0_PG,%eax /* enable paging */ 322 movl %eax,%cr0 /* and let's page NOW! */ 323 324 pushl $begin /* jump to high virtualized address */ 325 ret 326 327/* now running relocated at KERNBASE where the system is linked to run */ 328begin: 329 /* set up bootstrap stack */ 330 movl proc0kstack,%eax /* location of in-kernel stack */ 331 /* bootstrap stack end location */ 332 leal (KSTACK_PAGES*PAGE_SIZE-PCB_SIZE)(%eax),%esp 333 334 xorl %ebp,%ebp /* mark end of frames */ 335 336#ifdef PAE 337 movl IdlePDPT,%esi 338#else 339 movl IdlePTD,%esi 340#endif 341 movl %esi,(KSTACK_PAGES*PAGE_SIZE-PCB_SIZE+PCB_CR3)(%eax) 342 343 pushl physfree /* value of first for init386(first) */ 344 call init386 /* wire 386 chip for unix operation */ 345 346 /* 347 * Clean up the stack in a way that db_numargs() understands, so 348 * that backtraces in ddb don't underrun the stack. Traps for 349 * inaccessible memory are more fatal than usual this early. 350 */ 351 addl $4,%esp 352 353 call mi_startup /* autoconfiguration, mountroot etc */ 354 /* NOTREACHED */ 355 addl $0,%esp /* for db_numargs() again */ 356 357/* 358 * Signal trampoline, copied to top of user stack 359 */ 360NON_GPROF_ENTRY(sigcode) 361 calll *SIGF_HANDLER(%esp) 362 leal SIGF_UC(%esp),%eax /* get ucontext */ 363 pushl %eax 364 testl $PSL_VM,UC_EFLAGS(%eax) 365 jne 1f 366 movl UC_GS(%eax),%gs /* restore %gs */ 3671: 368 movl $SYS_sigreturn,%eax 369 pushl %eax /* junk to fake return addr. */ 370 int $0x80 /* enter kernel with args */ 371 /* on stack */ 3721: 373 jmp 1b 374 375#ifdef COMPAT_FREEBSD4 376 ALIGN_TEXT 377freebsd4_sigcode: 378 calll *SIGF_HANDLER(%esp) 379 leal SIGF_UC4(%esp),%eax /* get ucontext */ 380 pushl %eax 381 testl $PSL_VM,UC4_EFLAGS(%eax) 382 jne 1f 383 movl UC4_GS(%eax),%gs /* restore %gs */ 3841: 385 movl $344,%eax /* 4.x SYS_sigreturn */ 386 pushl %eax /* junk to fake return addr. */ 387 int $0x80 /* enter kernel with args */ 388 /* on stack */ 3891: 390 jmp 1b 391#endif 392 393#ifdef COMPAT_43 394 ALIGN_TEXT 395osigcode: 396 call *SIGF_HANDLER(%esp) /* call signal handler */ 397 lea SIGF_SC(%esp),%eax /* get sigcontext */ 398 pushl %eax 399 testl $PSL_VM,SC_PS(%eax) 400 jne 9f 401 movl SC_GS(%eax),%gs /* restore %gs */ 4029: 403 movl $103,%eax /* 3.x SYS_sigreturn */ 404 pushl %eax /* junk to fake return addr. */ 405 int $0x80 /* enter kernel with args */ 4060: jmp 0b 407#endif /* COMPAT_43 */ 408 409 ALIGN_TEXT 410esigcode: 411 412 .data 413 .globl szsigcode 414szsigcode: 415 .long esigcode-sigcode 416#ifdef COMPAT_FREEBSD4 417 .globl szfreebsd4_sigcode 418szfreebsd4_sigcode: 419 .long esigcode-freebsd4_sigcode 420#endif 421#ifdef COMPAT_43 422 .globl szosigcode 423szosigcode: 424 .long esigcode-osigcode 425#endif 426 .text 427 428/********************************************************************** 429 * 430 * Recover the bootinfo passed to us from the boot program 431 * 432 */ 433recover_bootinfo: 434 /* 435 * This code is called in different ways depending on what loaded 436 * and started the kernel. This is used to detect how we get the 437 * arguments from the other code and what we do with them. 438 * 439 * Old disk boot blocks: 440 * (*btext)(howto, bootdev, cyloffset, esym); 441 * [return address == 0, and can NOT be returned to] 442 * [cyloffset was not supported by the FreeBSD boot code 443 * and always passed in as 0] 444 * [esym is also known as total in the boot code, and 445 * was never properly supported by the FreeBSD boot code] 446 * 447 * Old diskless netboot code: 448 * (*btext)(0,0,0,0,&nfsdiskless,0,0,0); 449 * [return address != 0, and can NOT be returned to] 450 * If we are being booted by this code it will NOT work, 451 * so we are just going to halt if we find this case. 452 * 453 * New uniform boot code: 454 * (*btext)(howto, bootdev, 0, 0, 0, &bootinfo) 455 * [return address != 0, and can be returned to] 456 * 457 * There may seem to be a lot of wasted arguments in here, but 458 * that is so the newer boot code can still load very old kernels 459 * and old boot code can load new kernels. 460 */ 461 462 /* 463 * The old style disk boot blocks fake a frame on the stack and 464 * did an lret to get here. The frame on the stack has a return 465 * address of 0. 466 */ 467 cmpl $0,4(%ebp) 468 je olddiskboot 469 470 /* 471 * We have some form of return address, so this is either the 472 * old diskless netboot code, or the new uniform code. That can 473 * be detected by looking at the 5th argument, if it is 0 474 * we are being booted by the new uniform boot code. 475 */ 476 cmpl $0,24(%ebp) 477 je newboot 478 479 /* 480 * Seems we have been loaded by the old diskless boot code, we 481 * don't stand a chance of running as the diskless structure 482 * changed considerably between the two, so just halt. 483 */ 484 hlt 485 486 /* 487 * We have been loaded by the new uniform boot code. 488 * Let's check the bootinfo version, and if we do not understand 489 * it we return to the loader with a status of 1 to indicate this error 490 */ 491newboot: 492 movl 28(%ebp),%ebx /* &bootinfo.version */ 493 movl BI_VERSION(%ebx),%eax 494 cmpl $1,%eax /* We only understand version 1 */ 495 je 1f 496 movl $1,%eax /* Return status */ 497 leave 498 /* 499 * XXX this returns to our caller's caller (as is required) since 500 * we didn't set up a frame and our caller did. 501 */ 502 ret 503 5041: 505 /* 506 * If we have a kernelname copy it in 507 */ 508 movl BI_KERNELNAME(%ebx),%esi 509 cmpl $0,%esi 510 je 2f /* No kernelname */ 511 movl $MAXPATHLEN,%ecx /* Brute force!!! */ 512 movl $R(kernelname),%edi 513 cmpb $'/',(%esi) /* Make sure it starts with a slash */ 514 je 1f 515 movb $'/',(%edi) 516 incl %edi 517 decl %ecx 5181: 519 cld 520 rep 521 movsb 522 5232: 524 /* 525 * Determine the size of the boot loader's copy of the bootinfo 526 * struct. This is impossible to do properly because old versions 527 * of the struct don't contain a size field and there are 2 old 528 * versions with the same version number. 529 */ 530 movl $BI_ENDCOMMON,%ecx /* prepare for sizeless version */ 531 testl $RB_BOOTINFO,8(%ebp) /* bi_size (and bootinfo) valid? */ 532 je got_bi_size /* no, sizeless version */ 533 movl BI_SIZE(%ebx),%ecx 534got_bi_size: 535 536 /* 537 * Copy the common part of the bootinfo struct 538 */ 539 movl %ebx,%esi 540 movl $R(bootinfo),%edi 541 cmpl $BOOTINFO_SIZE,%ecx 542 jbe got_common_bi_size 543 movl $BOOTINFO_SIZE,%ecx 544got_common_bi_size: 545 cld 546 rep 547 movsb 548 549#ifdef NFS_ROOT 550#ifndef BOOTP_NFSV3 551 /* 552 * If we have a nfs_diskless structure copy it in 553 */ 554 movl BI_NFS_DISKLESS(%ebx),%esi 555 cmpl $0,%esi 556 je olddiskboot 557 movl $R(nfs_diskless),%edi 558 movl $NFSDISKLESS_SIZE,%ecx 559 cld 560 rep 561 movsb 562 movl $R(nfs_diskless_valid),%edi 563 movl $1,(%edi) 564#endif 565#endif 566 567 /* 568 * The old style disk boot. 569 * (*btext)(howto, bootdev, cyloffset, esym); 570 * Note that the newer boot code just falls into here to pick 571 * up howto and bootdev, cyloffset and esym are no longer used 572 */ 573olddiskboot: 574 movl 8(%ebp),%eax 575 movl %eax,R(boothowto) 576 movl 12(%ebp),%eax 577 movl %eax,R(bootdev) 578 579 ret 580 581 582/********************************************************************** 583 * 584 * Identify the CPU and initialize anything special about it 585 * 586 */ 587identify_cpu: 588 589 /* Try to toggle alignment check flag; does not exist on 386. */ 590 pushfl 591 popl %eax 592 movl %eax,%ecx 593 orl $PSL_AC,%eax 594 pushl %eax 595 popfl 596 pushfl 597 popl %eax 598 xorl %ecx,%eax 599 andl $PSL_AC,%eax 600 pushl %ecx 601 popfl 602 603 testl %eax,%eax 604 jnz try486 605 606 /* NexGen CPU does not have aligment check flag. */ 607 pushfl 608 movl $0x5555, %eax 609 xorl %edx, %edx 610 movl $2, %ecx 611 clc 612 divl %ecx 613 jz trynexgen 614 popfl 615 movl $CPU_386,R(cpu) 616 jmp 3f 617 618trynexgen: 619 popfl 620 movl $CPU_NX586,R(cpu) 621 movl $0x4778654e,R(cpu_vendor) # store vendor string 622 movl $0x72446e65,R(cpu_vendor+4) 623 movl $0x6e657669,R(cpu_vendor+8) 624 movl $0,R(cpu_vendor+12) 625 jmp 3f 626 627try486: /* Try to toggle identification flag; does not exist on early 486s. */ 628 pushfl 629 popl %eax 630 movl %eax,%ecx 631 xorl $PSL_ID,%eax 632 pushl %eax 633 popfl 634 pushfl 635 popl %eax 636 xorl %ecx,%eax 637 andl $PSL_ID,%eax 638 pushl %ecx 639 popfl 640 641 testl %eax,%eax 642 jnz trycpuid 643 movl $CPU_486,R(cpu) 644 645 /* 646 * Check Cyrix CPU 647 * Cyrix CPUs do not change the undefined flags following 648 * execution of the divide instruction which divides 5 by 2. 649 * 650 * Note: CPUID is enabled on M2, so it passes another way. 651 */ 652 pushfl 653 movl $0x5555, %eax 654 xorl %edx, %edx 655 movl $2, %ecx 656 clc 657 divl %ecx 658 jnc trycyrix 659 popfl 660 jmp 3f /* You may use Intel CPU. */ 661 662trycyrix: 663 popfl 664 /* 665 * IBM Bluelighting CPU also doesn't change the undefined flags. 666 * Because IBM doesn't disclose the information for Bluelighting 667 * CPU, we couldn't distinguish it from Cyrix's (including IBM 668 * brand of Cyrix CPUs). 669 */ 670 movl $0x69727943,R(cpu_vendor) # store vendor string 671 movl $0x736e4978,R(cpu_vendor+4) 672 movl $0x64616574,R(cpu_vendor+8) 673 jmp 3f 674 675trycpuid: /* Use the `cpuid' instruction. */ 676 xorl %eax,%eax 677 cpuid # cpuid 0 678 movl %eax,R(cpu_high) # highest capability 679 movl %ebx,R(cpu_vendor) # store vendor string 680 movl %edx,R(cpu_vendor+4) 681 movl %ecx,R(cpu_vendor+8) 682 movb $0,R(cpu_vendor+12) 683 684 movl $1,%eax 685 cpuid # cpuid 1 686 movl %eax,R(cpu_id) # store cpu_id 687 movl %ebx,R(cpu_procinfo) # store cpu_procinfo 688 movl %edx,R(cpu_feature) # store cpu_feature 689 rorl $8,%eax # extract family type 690 andl $15,%eax 691 cmpl $5,%eax 692 jae 1f 693 694 /* less than Pentium; must be 486 */ 695 movl $CPU_486,R(cpu) 696 jmp 3f 6971: 698 /* a Pentium? */ 699 cmpl $5,%eax 700 jne 2f 701 movl $CPU_586,R(cpu) 702 jmp 3f 7032: 704 /* Greater than Pentium...call it a Pentium Pro */ 705 movl $CPU_686,R(cpu) 7063: 707 ret 708 709 710/********************************************************************** 711 * 712 * Create the first page directory and its page tables. 713 * 714 */ 715 716create_pagetables: 717 718/* Find end of kernel image (rounded up to a page boundary). */ 719 movl $R(_end),%esi 720 721/* Include symbols, if any. */ 722 movl R(bootinfo+BI_ESYMTAB),%edi 723 testl %edi,%edi 724 je over_symalloc 725 movl %edi,%esi 726 movl $KERNBASE,%edi 727 addl %edi,R(bootinfo+BI_SYMTAB) 728 addl %edi,R(bootinfo+BI_ESYMTAB) 729over_symalloc: 730 731/* If we are told where the end of the kernel space is, believe it. */ 732 movl R(bootinfo+BI_KERNEND),%edi 733 testl %edi,%edi 734 je no_kernend 735 movl %edi,%esi 736no_kernend: 737 738 addl $PDRMASK,%esi /* Play conservative for now, and */ 739 andl $~PDRMASK,%esi /* ... wrap to next 4M. */ 740 movl %esi,R(KERNend) /* save end of kernel */ 741 movl %esi,R(physfree) /* next free page is at end of kernel */ 742 743/* Allocate Kernel Page Tables */ 744 ALLOCPAGES(NKPT) 745 movl %esi,R(KPTphys) 746 747/* Allocate Page Table Directory */ 748#ifdef PAE 749 /* XXX only need 32 bytes (easier for now) */ 750 ALLOCPAGES(1) 751 movl %esi,R(IdlePDPT) 752#endif 753 ALLOCPAGES(NPGPTD) 754 movl %esi,R(IdlePTD) 755 756/* Allocate UPAGES */ 757 ALLOCPAGES(UAREA_PAGES) 758 movl %esi,R(p0upa) 759 addl $KERNBASE, %esi 760 movl %esi, R(proc0uarea) 761 762 ALLOCPAGES(KSTACK_PAGES) 763 movl %esi,R(p0kpa) 764 addl $KERNBASE, %esi 765 movl %esi, R(proc0kstack) 766 767 ALLOCPAGES(1) /* vm86/bios stack */ 768 movl %esi,R(vm86phystk) 769 770 ALLOCPAGES(3) /* pgtable + ext + IOPAGES */ 771 movl %esi,R(vm86pa) 772 addl $KERNBASE, %esi 773 movl %esi, R(vm86paddr) 774 775#ifdef SMP 776/* Allocate cpu0's private data page */ 777 ALLOCPAGES(1) 778 movl %esi,R(cpu0pp) 779 addl $KERNBASE, %esi 780 movl %esi, R(cpu0prvpage) /* relocated to KVM space */ 781 782/* Allocate SMP page table page */ 783 ALLOCPAGES(1) 784 movl %esi,R(SMPptpa) 785 addl $KERNBASE, %esi 786 movl %esi, R(SMPpt) /* relocated to KVM space */ 787#endif /* SMP */ 788 789/* Map read-only from zero to the beginning of the kernel text section */ 790 xorl %eax, %eax 791 xorl %edx,%edx 792 movl $R(btext),%ecx 793 addl $PAGE_MASK,%ecx 794 shrl $PAGE_SHIFT,%ecx 795 fillkptphys(%edx) 796 797/* 798 * Enable PSE and PGE. 799 */ 800#ifndef DISABLE_PSE 801 testl $CPUID_PSE, R(cpu_feature) 802 jz 1f 803 movl $PG_PS, R(pseflag) 804 movl %cr4, %eax 805 orl $CR4_PSE, %eax 806 movl %eax, %cr4 8071: 808#endif 809#ifndef DISABLE_PG_G 810 testl $CPUID_PGE, R(cpu_feature) 811 jz 2f 812 movl $PG_G, R(pgeflag) 813 movl %cr4, %eax 814 orl $CR4_PGE, %eax 815 movl %eax, %cr4 8162: 817#endif 818 819/* 820 * Write page tables for the kernel starting at btext and 821 * until the end. Make sure to map read+write. We do this even 822 * if we've enabled PSE above, we'll just switch the corresponding kernel 823 * PDEs before we turn on paging. 824 * 825 * XXX: We waste some pages here in the PSE case! DON'T BLINDLY REMOVE 826 * THIS! SMP needs the page table to be there to map the kernel P==V. 827 */ 828 movl $R(btext),%eax 829 addl $PAGE_MASK, %eax 830 andl $~PAGE_MASK, %eax 831 movl $PG_RW,%edx 832 movl R(KERNend),%ecx 833 subl %eax,%ecx 834 shrl $PAGE_SHIFT,%ecx 835 fillkptphys(%edx) 836 837/* Map page directory. */ 838#ifdef PAE 839 movl R(IdlePDPT), %eax 840 movl $1, %ecx 841 fillkptphys($PG_RW) 842#endif 843 844 movl R(IdlePTD), %eax 845 movl $NPGPTD, %ecx 846 fillkptphys($PG_RW) 847 848/* Map proc0's UPAGES in the physical way ... */ 849 movl R(p0upa), %eax 850 movl $(UAREA_PAGES), %ecx 851 fillkptphys($PG_RW) 852 853/* Map proc0's KSTACK in the physical way ... */ 854 movl R(p0kpa), %eax 855 movl $(KSTACK_PAGES), %ecx 856 fillkptphys($PG_RW) 857 858/* Map ISA hole */ 859 movl $ISA_HOLE_START, %eax 860 movl $ISA_HOLE_LENGTH>>PAGE_SHIFT, %ecx 861 fillkptphys($PG_RW) 862 863/* Map space for the vm86 region */ 864 movl R(vm86phystk), %eax 865 movl $4, %ecx 866 fillkptphys($PG_RW) 867 868/* Map page 0 into the vm86 page table */ 869 movl $0, %eax 870 movl $0, %ebx 871 movl $1, %ecx 872 fillkpt(R(vm86pa), $PG_RW|PG_U) 873 874/* ...likewise for the ISA hole */ 875 movl $ISA_HOLE_START, %eax 876 movl $ISA_HOLE_START>>PAGE_SHIFT, %ebx 877 movl $ISA_HOLE_LENGTH>>PAGE_SHIFT, %ecx 878 fillkpt(R(vm86pa), $PG_RW|PG_U) 879 880#ifdef SMP 881/* Map cpu0's private page into global kmem (4K @ cpu0prvpage) */ 882 movl R(cpu0pp), %eax 883 movl $1, %ecx 884 fillkptphys($PG_RW) 885 886/* Map SMP page table page into global kmem FWIW */ 887 movl R(SMPptpa), %eax 888 movl $1, %ecx 889 fillkptphys($PG_RW) 890 891/* Map the private page into the SMP page table */ 892 movl R(cpu0pp), %eax 893 movl $0, %ebx /* pte offset = 0 */ 894 movl $1, %ecx /* one private page coming right up */ 895 fillkpt(R(SMPptpa), $PG_RW) 896 897/* ... and put the page table table in the pde. */ 898 movl R(SMPptpa), %eax 899 movl $MPPTDI, %ebx 900 movl $1, %ecx 901 fillkpt(R(IdlePTD), $PG_RW) 902 903/* Fakeup VA for the local apic to allow early traps. */ 904 ALLOCPAGES(1) 905 movl %esi, %eax 906 movl $(NPTEPG-1), %ebx /* pte offset = NTEPG-1 */ 907 movl $1, %ecx /* one private pt coming right up */ 908 fillkpt(R(SMPptpa), $PG_RW) 909#endif /* SMP */ 910 911/* install a pde for temporary double map of bottom of VA */ 912 movl R(KPTphys), %eax 913 xorl %ebx, %ebx 914 movl $NKPT, %ecx 915 fillkpt(R(IdlePTD), $PG_RW) 916 917/* 918 * For the non-PSE case, install PDEs for PTs covering the kernel. 919 * For the PSE case, do the same, but clobber the ones corresponding 920 * to the kernel (from btext to KERNend) with 4M ('PS') PDEs immediately 921 * after. 922 */ 923 movl R(KPTphys), %eax 924 movl $KPTDI, %ebx 925 movl $NKPT, %ecx 926 fillkpt(R(IdlePTD), $PG_RW) 927 cmpl $0,R(pseflag) 928 je done_pde 929 930 movl R(KERNend), %ecx 931 movl $KERNLOAD, %eax 932 subl %eax, %ecx 933 shrl $PDRSHIFT, %ecx 934 movl $(KPTDI+(KERNLOAD/(1 << PDRSHIFT))), %ebx 935 shll $PDESHIFT, %ebx 936 addl R(IdlePTD), %ebx 937 orl $(PG_V|PG_RW|PG_PS), %eax 9381: movl %eax, (%ebx) 939 addl $(1 << PDRSHIFT), %eax 940 addl $PDESIZE, %ebx 941 loop 1b 942 943done_pde: 944/* install a pde recursively mapping page directory as a page table */ 945 movl R(IdlePTD), %eax 946 movl $PTDPTDI, %ebx 947 movl $NPGPTD,%ecx 948 fillkpt(R(IdlePTD), $PG_RW) 949 950#ifdef PAE 951 movl R(IdlePTD), %eax 952 xorl %ebx, %ebx 953 movl $NPGPTD, %ecx 954 fillkpt(R(IdlePDPT), $0x0) 955#endif 956 957 ret 958