Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/i386/i386/locore.s
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1 /*- 2 * Copyright (c) 1990 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * William Jolitz. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * from: @(#)locore.s 7.3 (Berkeley) 5/13/91 37 * $FreeBSD$ 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_nfsroot.h" 48 49 #include <sys/syscall.h> 50 #include <sys/reboot.h> 51 52 #include <machine/asmacros.h> 53 #include <machine/cputypes.h> 54 #include <machine/psl.h> 55 #include <machine/pmap.h> 56 #include <machine/specialreg.h> 57 58 #include "assym.s" 59 60 /* 61 * XXX 62 * 63 * Note: This version greatly munged to avoid various assembler errors 64 * that may be fixed in newer versions of gas. Perhaps newer versions 65 * will have more pleasant appearance. 66 */ 67 68 /* 69 * PTmap is recursive pagemap at top of virtual address space. 70 * Within PTmap, the page directory can be found (third indirection). 71 */ 72 .globl _PTmap,_PTD,_PTDpde 73 .set _PTmap,(PTDPTDI << PDRSHIFT) 74 .set _PTD,_PTmap + (PTDPTDI * PAGE_SIZE) 75 .set _PTDpde,_PTD + (PTDPTDI * PDESIZE) 76 77 /* 78 * Compiled KERNBASE location 79 */ 80 .globl _kernbase 81 .set _kernbase,KERNBASE 82 83 /* 84 * Globals 85 */ 86 .data 87 ALIGN_DATA /* just to be sure */ 88 89 .globl tmpstk 90 .space 0x2000 /* space for tmpstk - temporary stack */ 91 tmpstk: 92 93 .globl _boothowto,_bootdev 94 95 .globl _cpu,_cpu_vendor,_cpu_id,_bootinfo 96 .globl _cpu_high, _cpu_feature, _cpu_procinfo 97 98 _cpu: .long 0 /* are we 386, 386sx, or 486 */ 99 _cpu_id: .long 0 /* stepping ID */ 100 _cpu_high: .long 0 /* highest arg to CPUID */ 101 _cpu_feature: .long 0 /* features */ 102 _cpu_procinfo: .long 0 /* brand index / HTT info */ 103 _cpu_vendor: .space 20 /* CPU origin code */ 104 _bootinfo: .space BOOTINFO_SIZE /* bootinfo that we can handle */ 105 106 .globl _KERNend 107 _KERNend: .long 0 /* phys addr end of kernel (just after bss) */ 108 physfree: .long 0 /* phys addr of next free page */ 109 110 #ifdef SMP 111 .globl _cpu0prvpage 112 cpu0pp: .long 0 /* phys addr cpu0 private pg */ 113 _cpu0prvpage: .long 0 /* relocated version */ 114 115 .globl _SMPpt 116 SMPptpa: .long 0 /* phys addr SMP page table */ 117 _SMPpt: .long 0 /* relocated version */ 118 #endif /* SMP */ 119 120 .globl _IdlePTD 121 _IdlePTD: .long 0 /* phys addr of kernel PTD */ 122 123 #ifdef PAE 124 .globl _IdlePDPT 125 .p2align 5 126 _IdlePDPT: .space 32 127 #endif 128 129 #ifdef SMP 130 .globl _KPTphys 131 #endif 132 _KPTphys: .long 0 /* phys addr of kernel page tables */ 133 134 .globl _proc0paddr 135 _proc0paddr: .long 0 /* address of proc 0 address space */ 136 p0upa: .long 0 /* phys addr of proc0's UPAGES */ 137 138 vm86phystk: .long 0 /* PA of vm86/bios stack */ 139 140 .globl _vm86paddr, _vm86pa 141 _vm86paddr: .long 0 /* address of vm86 region */ 142 _vm86pa: .long 0 /* phys addr of vm86 region */ 143 144 #ifdef BDE_DEBUGGER 145 .globl _bdb_exists /* flag to indicate BDE debugger is present */ 146 _bdb_exists: .long 0 147 #endif 148 149 #ifdef PC98 150 .globl _pc98_system_parameter 151 _pc98_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 ; \ 188 1: 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 */ 210 NON_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 #ifdef BDE_DEBUGGER 222 #ifdef BIOS_STEALS_3K 223 cmpl $0x0375c339,0x95504 224 #else 225 cmpl $0x0375c339,0x96104 /* XXX - debugger signature */ 226 #endif 227 jne 1f 228 movb $1,R(_bdb_exists) 229 1: 230 #endif 231 /* Tell the bios to warmboot next time */ 232 movw $0x1234,0x472 233 #endif /* PC98 */ 234 235 /* Set up a real frame in case the double return in newboot is executed. */ 236 pushl %ebp 237 movl %esp, %ebp 238 239 /* Don't trust what the BIOS gives for eflags. */ 240 pushl $PSL_KERNEL 241 popfl 242 243 /* 244 * Don't trust what the BIOS gives for %fs and %gs. Trust the bootstrap 245 * to set %cs, %ds, %es and %ss. 246 */ 247 mov %ds, %ax 248 mov %ax, %fs 249 mov %ax, %gs 250 251 /* 252 * Clear the bss. Not all boot programs do it, and it is our job anyway. 253 * 254 * XXX we don't check that there is memory for our bss and page tables 255 * before using it. 256 * 257 * Note: we must be careful to not overwrite an active gdt or idt. In 258 * the !BDE_DEBUGGER case they are inactive from now until we switch to 259 * new ones, since we don't load any more segment registers or permit 260 * interrupts until after the switch. In the BDE_DEBUGGER case, we depend 261 * on the convention that the boot program is below 1MB and we are above 262 * 1MB to keep the gdt and idt away from the bss and page tables. 263 */ 264 movl $R(_end),%ecx 265 movl $R(_edata),%edi 266 subl %edi,%ecx 267 xorl %eax,%eax 268 cld 269 rep 270 stosb 271 272 call recover_bootinfo 273 274 /* Get onto a stack that we can trust. */ 275 /* 276 * XXX this step is delayed in case recover_bootinfo needs to return via 277 * the old stack, but it need not be, since recover_bootinfo actually 278 * returns via the old frame. 279 */ 280 movl $R(tmpstk),%esp 281 282 #ifdef PC98 283 /* pc98_machine_type & M_EPSON_PC98 */ 284 testb $0x02,R(_pc98_system_parameter)+220 285 jz 3f 286 /* epson_machine_id <= 0x0b */ 287 cmpb $0x0b,R(_pc98_system_parameter)+224 288 ja 3f 289 290 /* count up memory */ 291 movl $0x100000,%eax /* next, talley remaining memory */ 292 movl $0xFFF-0x100,%ecx 293 1: movl 0(%eax),%ebx /* save location to check */ 294 movl $0xa55a5aa5,0(%eax) /* write test pattern */ 295 cmpl $0xa55a5aa5,0(%eax) /* does not check yet for rollover */ 296 jne 2f 297 movl %ebx,0(%eax) /* restore memory */ 298 addl $PAGE_SIZE,%eax 299 loop 1b 300 2: subl $0x100000,%eax 301 shrl $17,%eax 302 movb %al,R(_pc98_system_parameter)+1 303 3: 304 305 movw R(_pc98_system_parameter+0x86),%ax 306 movw %ax,R(_cpu_id) 307 #endif 308 309 call identify_cpu 310 call create_pagetables 311 312 /* 313 * If the CPU has support for VME, turn it on. 314 */ 315 testl $CPUID_VME, R(_cpu_feature) 316 jz 1f 317 movl %cr4, %eax 318 orl $CR4_VME, %eax 319 movl %eax, %cr4 320 1: 321 322 #ifdef BDE_DEBUGGER 323 /* 324 * Adjust as much as possible for paging before enabling paging so that the 325 * adjustments can be traced. 326 */ 327 call bdb_prepare_paging 328 #endif 329 330 /* Now enable paging */ 331 #ifdef PAE 332 movl %cr4,%eax 333 orl $CR4_PAE,%eax 334 movl %eax,%cr4 335 movl $R(_IdlePDPT),%eax 336 #else 337 movl R(_IdlePTD),%eax 338 #endif 339 movl %eax,%cr3 /* load ptd addr into mmu */ 340 movl %cr0,%eax /* get control word */ 341 orl $CR0_PE|CR0_PG,%eax /* enable paging */ 342 movl %eax,%cr0 /* and let's page NOW! */ 343 344 #ifdef BDE_DEBUGGER 345 /* 346 * Complete the adjustments for paging so that we can keep tracing through 347 * initi386() after the low (physical) addresses for the gdt and idt become 348 * invalid. 349 */ 350 call bdb_commit_paging 351 #endif 352 353 pushl $begin /* jump to high virtualized address */ 354 ret 355 356 /* now running relocated at KERNBASE where the system is linked to run */ 357 begin: 358 /* set up bootstrap stack */ 359 movl _proc0paddr,%esp /* location of in-kernel pages */ 360 addl $UPAGES*PAGE_SIZE,%esp /* bootstrap stack end location */ 361 xorl %eax,%eax /* mark end of frames */ 362 movl %eax,%ebp 363 movl _proc0paddr,%eax 364 movl %cr3,%esi 365 movl %esi,PCB_CR3(%eax) 366 367 testl $CPUID_PGE, R(_cpu_feature) 368 jz 1f 369 movl %cr4, %eax 370 orl $CR4_PGE, %eax 371 movl %eax, %cr4 372 1: 373 374 movl physfree, %esi 375 pushl %esi /* value of first for init386(first) */ 376 call _init386 /* wire 386 chip for unix operation */ 377 popl %esi 378 379 call _mi_startup /* autoconfiguration, mountroot etc */ 380 381 hlt /* never returns to here */ 382 383 /* 384 * Signal trampoline, copied to top of user stack 385 */ 386 NON_GPROF_ENTRY(sigcode) 387 call *SIGF_HANDLER(%esp) /* call signal handler */ 388 lea SIGF_UC(%esp),%eax /* get ucontext_t */ 389 pushl %eax 390 testl $PSL_VM,UC_EFLAGS(%eax) 391 jne 9f 392 movl UC_GS(%eax),%gs /* restore %gs */ 393 9: 394 movl $SYS_sigreturn,%eax 395 pushl %eax /* junk to fake return addr. */ 396 int $0x80 /* enter kernel with args */ 397 0: jmp 0b 398 399 ALIGN_TEXT 400 _osigcode: 401 call *SIGF_HANDLER(%esp) /* call signal handler */ 402 lea SIGF_SC(%esp),%eax /* get sigcontext */ 403 pushl %eax 404 testl $PSL_VM,SC_PS(%eax) 405 jne 9f 406 movl SC_GS(%eax),%gs /* restore %gs */ 407 9: 408 movl $0x01d516,SC_TRAPNO(%eax) /* magic: 0ldSiG */ 409 movl $SYS_sigreturn,%eax 410 pushl %eax /* junk to fake return addr. */ 411 int $0x80 /* enter kernel with args */ 412 0: jmp 0b 413 414 ALIGN_TEXT 415 _esigcode: 416 417 .data 418 .globl _szsigcode, _szosigcode 419 _szsigcode: 420 .long _esigcode-_sigcode 421 _szosigcode: 422 .long _esigcode-_osigcode 423 .text 424 425 /********************************************************************** 426 * 427 * Recover the bootinfo passed to us from the boot program 428 * 429 */ 430 recover_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 */ 488 newboot: 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 500 501 1: 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 515 1: 516 cld 517 rep 518 movsb 519 520 2: 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 531 got_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 541 got_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 */ 570 olddiskboot: 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 */ 584 identify_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 614 615 trynexgen: 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 623 624 try486: /* 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. */ 658 659 trycyrix: 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 671 672 trycpuid: /* 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 694 1: 695 /* a Pentium? */ 696 cmpl $5,%eax 697 jne 2f 698 movl $CPU_586,R(_cpu) 699 jmp 3f 700 2: 701 /* Greater than Pentium...call it a Pentium Pro */ 702 movl $CPU_686,R(_cpu) 703 3: 704 ret 705 706 707 /********************************************************************** 708 * 709 * Create the first page directory and its page tables. 710 * 711 */ 712 713 create_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) 726 over_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 733 no_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 ALLOCPAGES(NPGPTD) 746 movl %esi,R(_IdlePTD) 747 748 /* Allocate UPAGES */ 749 ALLOCPAGES(UPAGES) 750 movl %esi,R(p0upa) 751 addl $KERNBASE, %esi 752 movl %esi, R(_proc0paddr) 753 754 ALLOCPAGES(1) /* vm86/bios stack */ 755 movl %esi,R(vm86phystk) 756 757 ALLOCPAGES(3) /* pgtable + ext + IOPAGES */ 758 movl %esi,R(_vm86pa) 759 addl $KERNBASE, %esi 760 movl %esi, R(_vm86paddr) 761 762 #ifdef SMP 763 /* Allocate cpu0's private data page */ 764 ALLOCPAGES(1) 765 movl %esi,R(cpu0pp) 766 addl $KERNBASE, %esi 767 movl %esi, R(_cpu0prvpage) /* relocated to KVM space */ 768 769 /* Allocate SMP page table page */ 770 ALLOCPAGES(1) 771 movl %esi,R(SMPptpa) 772 addl $KERNBASE, %esi 773 movl %esi, R(_SMPpt) /* relocated to KVM space */ 774 #endif /* SMP */ 775 776 /* Map page zero read-write so bios32 calls can use it */ 777 xorl %eax, %eax 778 #ifdef BDE_DEBUGGER 779 /* If the debugger is present, actually map everything read-write. */ 780 cmpl $0,R(_bdb_exists) 781 jne map_read_write 782 #endif 783 movl $PG_RW,%edx 784 movl $1,%ecx 785 fillkptphys(%edx) 786 787 /* Map read-only from page 1 to the end of the kernel text section */ 788 movl $PAGE_SIZE, %eax 789 xorl %edx,%edx 790 #if !defined(SMP) 791 testl $CPUID_PGE, R(_cpu_feature) 792 jz 2f 793 orl $PG_G,%edx 794 #endif 795 796 2: movl $R(_etext),%ecx 797 addl $PAGE_MASK,%ecx 798 subl %eax,%ecx 799 shrl $PAGE_SHIFT,%ecx 800 fillkptphys(%edx) 801 802 /* Map read-write, data, bss and symbols */ 803 movl $R(_etext),%eax 804 addl $PAGE_MASK, %eax 805 andl $~PAGE_MASK, %eax 806 map_read_write: 807 movl $PG_RW,%edx 808 #if !defined(SMP) 809 testl $CPUID_PGE, R(_cpu_feature) 810 jz 1f 811 orl $PG_G,%edx 812 #endif 813 814 1: movl R(_KERNend),%ecx 815 subl %eax,%ecx 816 shrl $PAGE_SHIFT,%ecx 817 fillkptphys(%edx) 818 819 /* Map page directory. */ 820 movl R(_IdlePTD), %eax 821 movl $NPGPTD, %ecx 822 fillkptphys($PG_RW) 823 824 /* Map proc0's UPAGES in the physical way ... */ 825 movl R(p0upa), %eax 826 movl $UPAGES, %ecx 827 fillkptphys($PG_RW) 828 829 /* Map ISA hole */ 830 movl $ISA_HOLE_START, %eax 831 movl $ISA_HOLE_LENGTH>>PAGE_SHIFT, %ecx 832 fillkptphys($PG_RW) 833 834 /* Map space for the vm86 region */ 835 movl R(vm86phystk), %eax 836 movl $4, %ecx 837 fillkptphys($PG_RW) 838 839 /* Map page 0 into the vm86 page table */ 840 movl $0, %eax 841 movl $0, %ebx 842 movl $1, %ecx 843 fillkpt(R(_vm86pa), $PG_RW|PG_U) 844 845 /* ...likewise for the ISA hole */ 846 movl $ISA_HOLE_START, %eax 847 movl $ISA_HOLE_START>>PAGE_SHIFT, %ebx 848 movl $ISA_HOLE_LENGTH>>PAGE_SHIFT, %ecx 849 fillkpt(R(_vm86pa), $PG_RW|PG_U) 850 851 #ifdef SMP 852 /* Map cpu0's private page into global kmem (4K @ cpu0prvpage) */ 853 movl R(cpu0pp), %eax 854 movl $1, %ecx 855 fillkptphys($PG_RW) 856 857 /* Map SMP page table page into global kmem FWIW */ 858 movl R(SMPptpa), %eax 859 movl $1, %ecx 860 fillkptphys($PG_RW) 861 862 /* Map the private page into the SMP page table */ 863 movl R(cpu0pp), %eax 864 movl $0, %ebx /* pte offset = 0 */ 865 movl $1, %ecx /* one private page coming right up */ 866 fillkpt(R(SMPptpa), $PG_RW) 867 868 /* ... and put the page table table in the pde. */ 869 movl R(SMPptpa), %eax 870 movl $MPPTDI, %ebx 871 movl $1, %ecx 872 fillkpt(R(_IdlePTD), $PG_RW) 873 874 /* Fakeup VA for the local apic to allow early traps. */ 875 ALLOCPAGES(1) 876 movl %esi, %eax 877 movl $(NPTEPG-1), %ebx /* pte offset = NTEPG-1 */ 878 movl $1, %ecx /* one private pt coming right up */ 879 fillkpt(R(SMPptpa), $PG_RW) 880 881 /* Initialize mp lock to allow early traps */ 882 movl $1, R(_mp_lock) 883 #endif /* SMP */ 884 885 /* install a pde for temporary double map of bottom of VA */ 886 movl R(_KPTphys), %eax 887 xorl %ebx, %ebx 888 movl $NKPT, %ecx 889 fillkpt(R(_IdlePTD), $PG_RW) 890 891 /* install pde's for pt's */ 892 movl R(_KPTphys), %eax 893 movl $KPTDI, %ebx 894 movl $NKPT, %ecx 895 fillkpt(R(_IdlePTD), $PG_RW) 896 897 /* install a pde recursively mapping page directory as a page table */ 898 movl R(_IdlePTD), %eax 899 movl $PTDPTDI, %ebx 900 movl $NPGPTD, %ecx 901 fillkpt(R(_IdlePTD), $PG_RW) 902 903 #ifdef PAE 904 movl R(_IdlePTD),%eax 905 xorl %ebx,%ebx 906 movl $NPGPTD,%ecx 907 fillkpt($R(_IdlePDPT), $0) 908 #endif 909 ret 910 911 #ifdef BDE_DEBUGGER 912 bdb_prepare_paging: 913 cmpl $0,R(_bdb_exists) 914 je bdb_prepare_paging_exit 915 916 subl $6,%esp 917 918 /* 919 * Copy and convert debugger entries from the bootstrap gdt and idt 920 * to the kernel gdt and idt. Everything is still in low memory. 921 * Tracing continues to work after paging is enabled because the 922 * low memory addresses remain valid until everything is relocated. 923 * However, tracing through the setidt() that initializes the trace 924 * trap will crash. 925 */ 926 sgdt (%esp) 927 movl 2(%esp),%esi /* base address of bootstrap gdt */ 928 movl $R(_gdt),%edi 929 movl %edi,2(%esp) /* prepare to load kernel gdt */ 930 movl $8*18/4,%ecx 931 cld 932 rep /* copy gdt */ 933 movsl 934 movl $R(_gdt),-8+2(%edi) /* adjust gdt self-ptr */ 935 movb $0x92,-8+5(%edi) 936 lgdt (%esp) 937 938 sidt (%esp) 939 movl 2(%esp),%esi /* base address of current idt */ 940 movl 8+4(%esi),%eax /* convert dbg descriptor to ... */ 941 movw 8(%esi),%ax 942 movl %eax,R(bdb_dbg_ljmp+1) /* ... immediate offset ... */ 943 movl 8+2(%esi),%eax 944 movw %ax,R(bdb_dbg_ljmp+5) /* ... and selector for ljmp */ 945 movl 24+4(%esi),%eax /* same for bpt descriptor */ 946 movw 24(%esi),%ax 947 movl %eax,R(bdb_bpt_ljmp+1) 948 movl 24+2(%esi),%eax 949 movw %ax,R(bdb_bpt_ljmp+5) 950 movl R(_idt),%edi 951 movl %edi,2(%esp) /* prepare to load kernel idt */ 952 movl $8*4/4,%ecx 953 cld 954 rep /* copy idt */ 955 movsl 956 lidt (%esp) 957 958 addl $6,%esp 959 960 bdb_prepare_paging_exit: 961 ret 962 963 /* Relocate debugger gdt entries and gdt and idt pointers. */ 964 bdb_commit_paging: 965 cmpl $0,_bdb_exists 966 je bdb_commit_paging_exit 967 968 movl $_gdt+8*9,%eax /* adjust slots 9-17 */ 969 movl $9,%ecx 970 reloc_gdt: 971 movb $KERNBASE>>24,7(%eax) /* top byte of base addresses, was 0, */ 972 addl $8,%eax /* now KERNBASE>>24 */ 973 loop reloc_gdt 974 975 subl $6,%esp 976 sgdt (%esp) 977 addl $KERNBASE,2(%esp) 978 lgdt (%esp) 979 sidt (%esp) 980 addl $KERNBASE,2(%esp) 981 lidt (%esp) 982 addl $6,%esp 983 984 int $3 985 986 bdb_commit_paging_exit: 987 ret 988 989 #endif /* BDE_DEBUGGER */
Cache object: 718af8a6f0dcd5c308175da603f9b14c
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