Remove i386 support.
[dragonfly.git] / sys / platform / pc32 / i386 / locore.s
CommitLineData
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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: src/sys/i386/i386/locore.s,v 1.132.2.10 2003/02/03 20:54:49 jhb Exp $
4e7c41c5 38 * $DragonFly: src/sys/platform/pc32/i386/locore.s,v 1.13 2007/01/08 03:33:42 dillon Exp $
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39 *
40 * originally from: locore.s, by William F. Jolitz
41 *
42 * Substantially rewritten by David Greenman, Rod Grimes,
43 * Bruce Evans, Wolfgang Solfrank, Poul-Henning Kamp
44 * and many others.
45 */
46
47#include "opt_bootp.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 */
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73 .globl PTmap,PTD,PTDpde
74 .set PTmap,(PTDPTDI << PDRSHIFT)
75 .set PTD,PTmap + (PTDPTDI * PAGE_SIZE)
76 .set PTDpde,PTD + (PTDPTDI * PDESIZE)
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77
78/*
79 * APTmap, APTD is the alternate recursive pagemap.
80 * It's used when modifying another process's page tables.
81 */
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82 .globl APTmap,APTD,APTDpde
83 .set APTmap,APTDPTDI << PDRSHIFT
84 .set APTD,APTmap + (APTDPTDI * PAGE_SIZE)
85 .set APTDpde,PTD + (APTDPTDI * PDESIZE)
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86
87/*
88 * Compiled KERNBASE location
89 */
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90 .globl kernbase
91 .set kernbase,KERNBASE
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92
93/*
94 * Globals
95 */
96 .data
97 ALIGN_DATA /* just to be sure */
98
dae8fa2c 99 .globl .tmpstk
984263bc 100 .space 0x2000 /* space for tmpstk - temporary stack */
dae8fa2c 101.tmpstk:
984263bc 102
2954c92f 103 .globl boothowto,bootdev
984263bc 104
2954c92f 105 .globl cpu,cpu_vendor,cpu_id,bootinfo
97ee3efc 106 .globl cpu_high, cpu_feature, cpu_feature2, cpu_procinfo
984263bc 107
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108cpu: .long 0 /* are we 386, 386sx, or 486 */
109cpu_id: .long 0 /* stepping ID */
110cpu_high: .long 0 /* highest arg to CPUID */
111cpu_feature: .long 0 /* features */
97ee3efc 112cpu_feature2: .long 0 /* additional features */
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113cpu_procinfo: .long 0 /* brand index / HTT info */
114cpu_vendor: .space 20 /* CPU origin code */
115bootinfo: .space BOOTINFO_SIZE /* bootinfo buffer space */
984263bc 116
2954c92f 117KERNend: .long 0 /* phys addr end of kernel (just after bss) */
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118physfree: .long 0 /* phys addr of next free page */
119
81c04d07 120#if 0
2954c92f 121 .globl cpu0prvpage
2954c92f 122cpu0prvpage: .long 0 /* relocated version */
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123#endif
124cpu0pp: .long 0 /* phys addr cpu0 private pg */
17a9f566 125cpu0idlestk: .long 0 /* stack for the idle thread */
984263bc 126
2954c92f 127 .globl SMPpt
984263bc 128SMPptpa: .long 0 /* phys addr SMP page table */
2954c92f 129SMPpt: .long 0 /* relocated version */
984263bc 130
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131 .globl IdlePTD
132IdlePTD: .long 0 /* phys addr of kernel PTD */
984263bc 133
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134 .globl KPTphys
135KPTphys: .long 0 /* PA of kernel page tables */
984263bc 136
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137 .globl proc0paddr
138proc0paddr: .long 0 /* VA of proc 0 address space */
139p0upa: .long 0 /* PA of proc0's UPAGES */
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140
141vm86phystk: .long 0 /* PA of vm86/bios stack */
142
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143 .globl vm86paddr, vm86pa
144vm86paddr: .long 0 /* address of vm86 region */
145vm86pa: .long 0 /* phys addr of vm86 region */
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146
147#ifdef BDE_DEBUGGER
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148 .globl bdb_exists /* BDE debugger is present */
149bdb_exists: .long 0
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150#endif
151
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152/**********************************************************************
153 *
154 * Some handy macros
155 *
156 */
157
158#define R(foo) ((foo)-KERNBASE)
159
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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 ; \
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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 $2,%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 $4,%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 ; \
2954c92f 199 fillkpt(R(KPTphys), prot)
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200
201 .text
202/**********************************************************************
203 *
204 * This is where the bootblocks start us, set the ball rolling...
205 *
206 */
207NON_GPROF_ENTRY(btext)
208
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209#ifdef BDE_DEBUGGER
210#ifdef BIOS_STEALS_3K
211 cmpl $0x0375c339,0x95504
212#else
213 cmpl $0x0375c339,0x96104 /* XXX - debugger signature */
214#endif
215 jne 1f
2954c92f 216 movb $1,R(bdb_exists)
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2171:
218#endif
219/* Tell the bios to warmboot next time */
220 movw $0x1234,0x472
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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
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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
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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 */
dae8fa2c 264 movl $R(.tmpstk),%esp
984263bc 265
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266 call identify_cpu
267
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268 call create_pagetables
269
270/*
271 * If the CPU has support for VME, turn it on.
272 */
2954c92f 273 testl $CPUID_VME, R(cpu_feature)
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274 jz 1f
275 movl %cr4, %eax
276 orl $CR4_VME, %eax
277 movl %eax, %cr4
2781:
279
280#ifdef BDE_DEBUGGER
281/*
282 * Adjust as much as possible for paging before enabling paging so that the
283 * adjustments can be traced.
284 */
285 call bdb_prepare_paging
286#endif
287
288/* Now enable paging */
2954c92f 289 movl R(IdlePTD), %eax
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290 movl %eax,%cr3 /* load ptd addr into mmu */
291 movl %cr0,%eax /* get control word */
292 orl $CR0_PE|CR0_PG,%eax /* enable paging */
293 movl %eax,%cr0 /* and let's page NOW! */
294
17a9f566 295
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296#ifdef BDE_DEBUGGER
297/*
298 * Complete the adjustments for paging so that we can keep tracing through
299 * initi386() after the low (physical) addresses for the gdt and idt become
300 * invalid.
301 */
302 call bdb_commit_paging
303#endif
304
305 pushl $begin /* jump to high virtualized address */
306 ret
307
308/* now running relocated at KERNBASE where the system is linked to run */
309begin:
17a9f566 310
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311 /*
312 * set up the bootstrap stack. The pcb sits at the end of the
313 * bootstrap stack.
314 */
984263bc 315 /* set up bootstrap stack */
2954c92f 316 movl proc0paddr,%esp /* location of in-kernel pages */
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317 addl $UPAGES*PAGE_SIZE-PCB_SIZE,%esp
318 xorl %eax,%eax /* mark end of frames */
984263bc 319 movl %eax,%ebp
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320 /*movl proc0paddr,%eax*/
321 movl IdlePTD, %esi
b7c628e4 322 movl %esi,PCB_CR3(%esp)
984263bc 323
2954c92f 324 testl $CPUID_PGE, R(cpu_feature)
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325 jz 1f
326 movl %cr4, %eax
327 orl $CR4_PGE, %eax
328 movl %eax, %cr4
3291:
330
331 movl physfree, %esi
2954c92f 332 pushl %esi /* value of first for init386(first) */
17a9f566 333
2954c92f 334 call init386 /* wire 386 chip for unix operation */
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335 popl %esi
336
2954c92f 337 call mi_startup /* autoconfiguration, mountroot etc */
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338
339 hlt /* never returns to here */
340
341/*
342 * Signal trampoline, copied to top of user stack
343 */
344NON_GPROF_ENTRY(sigcode)
345 call *SIGF_HANDLER(%esp) /* call signal handler */
346 lea SIGF_UC(%esp),%eax /* get ucontext_t */
347 pushl %eax
348 testl $PSL_VM,UC_EFLAGS(%eax)
349 jne 9f
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3509:
351 movl $SYS_sigreturn,%eax
352 pushl %eax /* junk to fake return addr. */
353 int $0x80 /* enter kernel with args */
3540: jmp 0b
355
984263bc 356 ALIGN_TEXT
2954c92f 357esigcode:
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358
359 .data
65957d54 360 .globl szsigcode
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361szsigcode:
362 .long esigcode - sigcode
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363 .text
364
365/**********************************************************************
366 *
367 * Recover the bootinfo passed to us from the boot program
368 *
369 */
370recover_bootinfo:
371 /*
372 * This code is called in different ways depending on what loaded
373 * and started the kernel. This is used to detect how we get the
374 * arguments from the other code and what we do with them.
375 *
376 * Old disk boot blocks:
377 * (*btext)(howto, bootdev, cyloffset, esym);
378 * [return address == 0, and can NOT be returned to]
379 * [cyloffset was not supported by the FreeBSD boot code
380 * and always passed in as 0]
381 * [esym is also known as total in the boot code, and
382 * was never properly supported by the FreeBSD boot code]
383 *
384 * Old diskless netboot code:
385 * (*btext)(0,0,0,0,&nfsdiskless,0,0,0);
386 * [return address != 0, and can NOT be returned to]
387 * If we are being booted by this code it will NOT work,
388 * so we are just going to halt if we find this case.
389 *
390 * New uniform boot code:
391 * (*btext)(howto, bootdev, 0, 0, 0, &bootinfo)
392 * [return address != 0, and can be returned to]
393 *
394 * There may seem to be a lot of wasted arguments in here, but
395 * that is so the newer boot code can still load very old kernels
396 * and old boot code can load new kernels.
397 */
398
399 /*
400 * The old style disk boot blocks fake a frame on the stack and
401 * did an lret to get here. The frame on the stack has a return
402 * address of 0.
403 */
404 cmpl $0,4(%ebp)
405 je olddiskboot
406
407 /*
408 * We have some form of return address, so this is either the
409 * old diskless netboot code, or the new uniform code. That can
410 * be detected by looking at the 5th argument, if it is 0
411 * we are being booted by the new uniform boot code.
412 */
413 cmpl $0,24(%ebp)
414 je newboot
415
416 /*
417 * Seems we have been loaded by the old diskless boot code, we
418 * don't stand a chance of running as the diskless structure
419 * changed considerably between the two, so just halt.
420 */
421 hlt
422
423 /*
424 * We have been loaded by the new uniform boot code.
425 * Let's check the bootinfo version, and if we do not understand
426 * it we return to the loader with a status of 1 to indicate this error
427 */
428newboot:
429 movl 28(%ebp),%ebx /* &bootinfo.version */
430 movl BI_VERSION(%ebx),%eax
431 cmpl $1,%eax /* We only understand version 1 */
432 je 1f
433 movl $1,%eax /* Return status */
434 leave
435 /*
436 * XXX this returns to our caller's caller (as is required) since
437 * we didn't set up a frame and our caller did.
438 */
439 ret
440
4411:
442 /*
443 * If we have a kernelname copy it in
444 */
445 movl BI_KERNELNAME(%ebx),%esi
446 cmpl $0,%esi
447 je 2f /* No kernelname */
448 movl $MAXPATHLEN,%ecx /* Brute force!!! */
2954c92f 449 movl $R(kernelname),%edi
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450 cmpb $'/',(%esi) /* Make sure it starts with a slash */
451 je 1f
452 movb $'/',(%edi)
453 incl %edi
454 decl %ecx
4551:
456 cld
457 rep
458 movsb
459
4602:
461 /*
462 * Determine the size of the boot loader's copy of the bootinfo
463 * struct. This is impossible to do properly because old versions
464 * of the struct don't contain a size field and there are 2 old
465 * versions with the same version number.
466 */
467 movl $BI_ENDCOMMON,%ecx /* prepare for sizeless version */
468 testl $RB_BOOTINFO,8(%ebp) /* bi_size (and bootinfo) valid? */
469 je got_bi_size /* no, sizeless version */
470 movl BI_SIZE(%ebx),%ecx
471got_bi_size:
472
473 /*
474 * Copy the common part of the bootinfo struct
475 */
476 movl %ebx,%esi
2954c92f 477 movl $R(bootinfo),%edi
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478 cmpl $BOOTINFO_SIZE,%ecx
479 jbe got_common_bi_size
480 movl $BOOTINFO_SIZE,%ecx
481got_common_bi_size:
482 cld
483 rep
484 movsb
485
486#ifdef NFS_ROOT
487#ifndef BOOTP_NFSV3
488 /*
489 * If we have a nfs_diskless structure copy it in
490 */
491 movl BI_NFS_DISKLESS(%ebx),%esi
492 cmpl $0,%esi
493 je olddiskboot
2954c92f 494 movl $R(nfs_diskless),%edi
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495 movl $NFSDISKLESS_SIZE,%ecx
496 cld
497 rep
498 movsb
2954c92f 499 movl $R(nfs_diskless_valid),%edi
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500 movl $1,(%edi)
501#endif
502#endif
503
504 /*
505 * The old style disk boot.
506 * (*btext)(howto, bootdev, cyloffset, esym);
507 * Note that the newer boot code just falls into here to pick
508 * up howto and bootdev, cyloffset and esym are no longer used
509 */
510olddiskboot:
511 movl 8(%ebp),%eax
2954c92f 512 movl %eax,R(boothowto)
984263bc 513 movl 12(%ebp),%eax
2954c92f 514 movl %eax,R(bootdev)
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515
516 ret
517
518
519/**********************************************************************
520 *
521 * Identify the CPU and initialize anything special about it
522 *
523 */
524identify_cpu:
525
526 /* Try to toggle alignment check flag; does not exist on 386. */
527 pushfl
528 popl %eax
529 movl %eax,%ecx
530 orl $PSL_AC,%eax
531 pushl %eax
532 popfl
533 pushfl
534 popl %eax
535 xorl %ecx,%eax
536 andl $PSL_AC,%eax
537 pushl %ecx
538 popfl
539
540 testl %eax,%eax
541 jnz try486
542
543 /* NexGen CPU does not have aligment check flag. */
544 pushfl
545 movl $0x5555, %eax
546 xorl %edx, %edx
547 movl $2, %ecx
548 clc
549 divl %ecx
550 jz trynexgen
551 popfl
2954c92f 552 movl $CPU_386,R(cpu)
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553 jmp 3f
554
555trynexgen:
556 popfl
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557 movl $CPU_NX586,R(cpu)
558 movl $0x4778654e,R(cpu_vendor) # store vendor string
559 movl $0x72446e65,R(cpu_vendor+4)
560 movl $0x6e657669,R(cpu_vendor+8)
561 movl $0,R(cpu_vendor+12)
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562 jmp 3f
563
564try486: /* Try to toggle identification flag; does not exist on early 486s. */
565 pushfl
566 popl %eax
567 movl %eax,%ecx
568 xorl $PSL_ID,%eax
569 pushl %eax
570 popfl
571 pushfl
572 popl %eax
573 xorl %ecx,%eax
574 andl $PSL_ID,%eax
575 pushl %ecx
576 popfl
577
578 testl %eax,%eax
579 jnz trycpuid
2954c92f 580 movl $CPU_486,R(cpu)
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581
582 /*
583 * Check Cyrix CPU
584 * Cyrix CPUs do not change the undefined flags following
585 * execution of the divide instruction which divides 5 by 2.
586 *
587 * Note: CPUID is enabled on M2, so it passes another way.
588 */
589 pushfl
590 movl $0x5555, %eax
591 xorl %edx, %edx
592 movl $2, %ecx
593 clc
594 divl %ecx
595 jnc trycyrix
596 popfl
597 jmp 3f /* You may use Intel CPU. */
598
599trycyrix:
600 popfl
601 /*
602 * IBM Bluelighting CPU also doesn't change the undefined flags.
603 * Because IBM doesn't disclose the information for Bluelighting
604 * CPU, we couldn't distinguish it from Cyrix's (including IBM
605 * brand of Cyrix CPUs).
606 */
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607 movl $0x69727943,R(cpu_vendor) # store vendor string
608 movl $0x736e4978,R(cpu_vendor+4)
609 movl $0x64616574,R(cpu_vendor+8)
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610 jmp 3f
611
612trycpuid: /* Use the `cpuid' instruction. */
613 xorl %eax,%eax
614 cpuid # cpuid 0
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615 movl %eax,R(cpu_high) # highest capability
616 movl %ebx,R(cpu_vendor) # store vendor string
617 movl %edx,R(cpu_vendor+4)
618 movl %ecx,R(cpu_vendor+8)
619 movb $0,R(cpu_vendor+12)
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620
621 movl $1,%eax
622 cpuid # cpuid 1
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623 movl %eax,R(cpu_id) # store cpu_id
624 movl %ebx,R(cpu_procinfo) # store cpu_procinfo
625 movl %edx,R(cpu_feature) # store cpu_feature
97ee3efc 626 movl %ecx,R(cpu_feature2) # store cpu_feature2
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627 rorl $8,%eax # extract family type
628 andl $15,%eax
629 cmpl $5,%eax
630 jae 1f
631
632 /* less than Pentium; must be 486 */
2954c92f 633 movl $CPU_486,R(cpu)
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634 jmp 3f
6351:
636 /* a Pentium? */
637 cmpl $5,%eax
638 jne 2f
2954c92f 639 movl $CPU_586,R(cpu)
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640 jmp 3f
6412:
642 /* Greater than Pentium...call it a Pentium Pro */
2954c92f 643 movl $CPU_686,R(cpu)
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6443:
645 ret
646
647
648/**********************************************************************
649 *
650 * Create the first page directory and its page tables.
651 *
652 */
653
654create_pagetables:
655
656/* Find end of kernel image (rounded up to a page boundary). */
2954c92f 657 movl $R(end),%esi
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658
659/* Include symbols, if any. */
2954c92f 660 movl R(bootinfo+BI_ESYMTAB),%edi
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661 testl %edi,%edi
662 je over_symalloc
663 movl %edi,%esi
664 movl $KERNBASE,%edi
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665 addl %edi,R(bootinfo+BI_SYMTAB)
666 addl %edi,R(bootinfo+BI_ESYMTAB)
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667over_symalloc:
668
669/* If we are told where the end of the kernel space is, believe it. */
2954c92f 670 movl R(bootinfo+BI_KERNEND),%edi
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671 testl %edi,%edi
672 je no_kernend
673 movl %edi,%esi
674no_kernend:
675
676 addl $PAGE_MASK,%esi
677 andl $~PAGE_MASK,%esi
2954c92f 678 movl %esi,R(KERNend) /* save end of kernel */
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679 movl %esi,R(physfree) /* next free page is at end of kernel */
680
17a9f566 681
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682/* Allocate Kernel Page Tables */
683 ALLOCPAGES(NKPT)
2954c92f 684 movl %esi,R(KPTphys)
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685
686/* Allocate Page Table Directory */
687 ALLOCPAGES(1)
2954c92f 688 movl %esi,R(IdlePTD)
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689
690/* Allocate UPAGES */
691 ALLOCPAGES(UPAGES)
692 movl %esi,R(p0upa)
693 addl $KERNBASE, %esi
2954c92f 694 movl %esi, R(proc0paddr)
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695
696 ALLOCPAGES(1) /* vm86/bios stack */
697 movl %esi,R(vm86phystk)
698
699 ALLOCPAGES(3) /* pgtable + ext + IOPAGES */
2954c92f 700 movl %esi,R(vm86pa)
984263bc 701 addl $KERNBASE, %esi
2954c92f 702 movl %esi, R(vm86paddr)
984263bc 703
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704/* Allocate cpu0's mdglobaldata */
705 ALLOCPAGES(MDGLOBALDATA_BASEALLOC_PAGES)
984263bc 706 movl %esi,R(cpu0pp)
81c04d07 707#if 0
984263bc 708 addl $KERNBASE, %esi
2954c92f 709 movl %esi, R(cpu0prvpage) /* relocated to KVM space */
81c04d07 710#endif
984263bc 711
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712/* Allocate cpu0's idle stack */
713 ALLOCPAGES(UPAGES)
714 movl %esi,R(cpu0idlestk)
715
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716/* Allocate SMP page table page */
717 ALLOCPAGES(1)
718 movl %esi,R(SMPptpa)
719 addl $KERNBASE, %esi
2954c92f 720 movl %esi, R(SMPpt) /* relocated to KVM space */
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721
722/* Map read-only from zero to the end of the kernel text section */
723 xorl %eax, %eax
724#ifdef BDE_DEBUGGER
725/* If the debugger is present, actually map everything read-write. */
2954c92f 726 cmpl $0,R(bdb_exists)
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727 jne map_read_write
728#endif
729 xorl %edx,%edx
730
731#if !defined(SMP)
2954c92f 732 testl $CPUID_PGE, R(cpu_feature)
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733 jz 2f
734 orl $PG_G,%edx
735#endif
736
2954c92f 7372: movl $R(etext),%ecx
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738 addl $PAGE_MASK,%ecx
739 shrl $PAGE_SHIFT,%ecx
740 fillkptphys(%edx)
741
742/* Map read-write, data, bss and symbols */
2954c92f 743 movl $R(etext),%eax
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744 addl $PAGE_MASK, %eax
745 andl $~PAGE_MASK, %eax
746map_read_write:
747 movl $PG_RW,%edx
748#if !defined(SMP)
2954c92f 749 testl $CPUID_PGE, R(cpu_feature)
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750 jz 1f
751 orl $PG_G,%edx
752#endif
753
2954c92f 7541: movl R(KERNend),%ecx
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755 subl %eax,%ecx
756 shrl $PAGE_SHIFT,%ecx
757 fillkptphys(%edx)
758
759/* Map page directory. */
2954c92f 760 movl R(IdlePTD), %eax
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761 movl $1, %ecx
762 fillkptphys($PG_RW)
763
764/* Map proc0's UPAGES in the physical way ... */
765 movl R(p0upa), %eax
766 movl $UPAGES, %ecx
767 fillkptphys($PG_RW)
768
769/* Map ISA hole */
770 movl $ISA_HOLE_START, %eax
771 movl $ISA_HOLE_LENGTH>>PAGE_SHIFT, %ecx
772 fillkptphys($PG_RW)
773
774/* Map space for the vm86 region */
775 movl R(vm86phystk), %eax
776 movl $4, %ecx
777 fillkptphys($PG_RW)
778
779/* Map page 0 into the vm86 page table */
780 movl $0, %eax
781 movl $0, %ebx
782 movl $1, %ecx
2954c92f 783 fillkpt(R(vm86pa), $PG_RW|PG_U)
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784
785/* ...likewise for the ISA hole */
786 movl $ISA_HOLE_START, %eax
787 movl $ISA_HOLE_START>>PAGE_SHIFT, %ebx
788 movl $ISA_HOLE_LENGTH>>PAGE_SHIFT, %ecx
2954c92f 789 fillkpt(R(vm86pa), $PG_RW|PG_U)
984263bc 790
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MD
791#if 0
792/* Map cpu0's mdglobaldata into global kmem (N pages @ cpu0pp) */
984263bc 793 movl R(cpu0pp), %eax
81c04d07 794 movl $MDGLOBALDATA_BASEALLOC_PAGES, %ecx
984263bc 795 fillkptphys($PG_RW)
81c04d07 796#endif
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797
798/* Map SMP page table page into global kmem FWIW */
799 movl R(SMPptpa), %eax
800 movl $1, %ecx
801 fillkptphys($PG_RW)
802
803/* Map the private page into the SMP page table */
804 movl R(cpu0pp), %eax
805 movl $0, %ebx /* pte offset = 0 */
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806 /* N private pages coming right up */
807 movl $MDGLOBALDATA_BASEALLOC_PAGES, %ecx
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808 fillkpt(R(SMPptpa), $PG_RW)
809
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810/* Map the cpu0's idle thread stack */
811 movl R(cpu0idlestk), %eax
812 movl $PS_IDLESTACK_PAGE, %ebx
813 movl $UPAGES, %ecx
814 fillkpt(R(SMPptpa), $PG_RW)
815
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816/* ... and put the page table table in the pde. */
817 movl R(SMPptpa), %eax
818 movl $MPPTDI, %ebx
819 movl $1, %ecx
2954c92f 820 fillkpt(R(IdlePTD), $PG_RW)
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821
822/* Fakeup VA for the local apic to allow early traps. */
823 ALLOCPAGES(1)
824 movl %esi, %eax
825 movl $(NPTEPG-1), %ebx /* pte offset = NTEPG-1 */
826 movl $1, %ecx /* one private pt coming right up */
827 fillkpt(R(SMPptpa), $PG_RW)
828
17a9f566 829#ifdef SMP
984263bc 830/* Initialize mp lock to allow early traps */
96728c05 831 movl $0, R(mp_lock)
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832#endif /* SMP */
833
834/* install a pde for temporary double map of bottom of VA */
2954c92f 835 movl R(KPTphys), %eax
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836 xorl %ebx, %ebx
837 movl $NKPT, %ecx
2954c92f 838 fillkpt(R(IdlePTD), $PG_RW)
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839
840/* install pde's for pt's */
2954c92f 841 movl R(KPTphys), %eax
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842 movl $KPTDI, %ebx
843 movl $NKPT, %ecx
2954c92f 844 fillkpt(R(IdlePTD), $PG_RW)
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845
846/* install a pde recursively mapping page directory as a page table */
2954c92f 847 movl R(IdlePTD), %eax
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848 movl $PTDPTDI, %ebx
849 movl $1,%ecx
2954c92f 850 fillkpt(R(IdlePTD), $PG_RW)
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851
852 ret
853
854#ifdef BDE_DEBUGGER
855bdb_prepare_paging:
2954c92f 856 cmpl $0,R(bdb_exists)
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857 je bdb_prepare_paging_exit
858
859 subl $6,%esp
860
861 /*
862 * Copy and convert debugger entries from the bootstrap gdt and idt
863 * to the kernel gdt and idt. Everything is still in low memory.
864 * Tracing continues to work after paging is enabled because the
865 * low memory addresses remain valid until everything is relocated.
866 * However, tracing through the setidt() that initializes the trace
867 * trap will crash.
868 */
869 sgdt (%esp)
870 movl 2(%esp),%esi /* base address of bootstrap gdt */
2954c92f 871 movl $R(gdt),%edi
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872 movl %edi,2(%esp) /* prepare to load kernel gdt */
873 movl $8*18/4,%ecx
874 cld
875 rep /* copy gdt */
876 movsl
2954c92f 877 movl $R(gdt),-8+2(%edi) /* adjust gdt self-ptr */
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878 movb $0x92,-8+5(%edi)
879 lgdt (%esp)
880
881 sidt (%esp)
882 movl 2(%esp),%esi /* base address of current idt */
883 movl 8+4(%esi),%eax /* convert dbg descriptor to ... */
884 movw 8(%esi),%ax
885 movl %eax,R(bdb_dbg_ljmp+1) /* ... immediate offset ... */
886 movl 8+2(%esi),%eax
887 movw %ax,R(bdb_dbg_ljmp+5) /* ... and selector for ljmp */
888 movl 24+4(%esi),%eax /* same for bpt descriptor */
889 movw 24(%esi),%ax
890 movl %eax,R(bdb_bpt_ljmp+1)
891 movl 24+2(%esi),%eax
892 movw %ax,R(bdb_bpt_ljmp+5)
2954c92f 893 movl R(idt),%edi
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894 movl %edi,2(%esp) /* prepare to load kernel idt */
895 movl $8*4/4,%ecx
896 cld
897 rep /* copy idt */
898 movsl
899 lidt (%esp)
900
901 addl $6,%esp
902
903bdb_prepare_paging_exit:
904 ret
905
906/* Relocate debugger gdt entries and gdt and idt pointers. */
907bdb_commit_paging:
908 cmpl $0,_bdb_exists
909 je bdb_commit_paging_exit
910
911 movl $_gdt+8*9,%eax /* adjust slots 9-17 */
912 movl $9,%ecx
913reloc_gdt:
914 movb $KERNBASE>>24,7(%eax) /* top byte of base addresses, was 0, */
915 addl $8,%eax /* now KERNBASE>>24 */
916 loop reloc_gdt
917
918 subl $6,%esp
919 sgdt (%esp)
920 addl $KERNBASE,2(%esp)
921 lgdt (%esp)
922 sidt (%esp)
923 addl $KERNBASE,2(%esp)
924 lidt (%esp)
925 addl $6,%esp
926
927 int $3
928
929bdb_commit_paging_exit:
930 ret
931
932#endif /* BDE_DEBUGGER */