Annotation of src/sys/arch/i386/i386/locore.S, Revision 1.115
1.115 ! maxv 1: /* $NetBSD: locore.S,v 1.114 2015/08/30 01:46:03 uebayasi Exp $ */
1.53 yamt 2:
3: /*
4: * Copyright-o-rama!
5: */
6:
7: /*
1.62 bouyer 8: * Copyright (c) 2006 Manuel Bouyer.
9: *
10: * Redistribution and use in source and binary forms, with or without
11: * modification, are permitted provided that the following conditions
12: * are met:
13: * 1. Redistributions of source code must retain the above copyright
14: * notice, this list of conditions and the following disclaimer.
15: * 2. Redistributions in binary form must reproduce the above copyright
16: * notice, this list of conditions and the following disclaimer in the
17: * documentation and/or other materials provided with the distribution.
18: *
19: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29: *
30: */
31:
32: /*
1.53 yamt 33: * Copyright (c) 2001 Wasabi Systems, Inc.
34: * All rights reserved.
35: *
36: * Written by Frank van der Linden for Wasabi Systems, Inc.
37: *
38: * Redistribution and use in source and binary forms, with or without
39: * modification, are permitted provided that the following conditions
40: * are met:
41: * 1. Redistributions of source code must retain the above copyright
42: * notice, this list of conditions and the following disclaimer.
43: * 2. Redistributions in binary form must reproduce the above copyright
44: * notice, this list of conditions and the following disclaimer in the
45: * documentation and/or other materials provided with the distribution.
46: * 3. All advertising materials mentioning features or use of this software
47: * must display the following acknowledgement:
48: * This product includes software developed for the NetBSD Project by
49: * Wasabi Systems, Inc.
50: * 4. The name of Wasabi Systems, Inc. may not be used to endorse
51: * or promote products derived from this software without specific prior
52: * written permission.
53: *
54: * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
55: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
56: * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
57: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
58: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
59: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
60: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
61: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
62: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
63: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
64: * POSSIBILITY OF SUCH DAMAGE.
65: */
66:
1.1 fvdl 67: /*-
1.84 ad 68: * Copyright (c) 1998, 2000, 2004, 2006, 2007, 2009 The NetBSD Foundation, Inc.
1.1 fvdl 69: * All rights reserved.
70: *
71: * This code is derived from software contributed to The NetBSD Foundation
1.84 ad 72: * by Charles M. Hannum, and by Andrew Doran.
1.1 fvdl 73: *
74: * Redistribution and use in source and binary forms, with or without
75: * modification, are permitted provided that the following conditions
76: * are met:
77: * 1. Redistributions of source code must retain the above copyright
78: * notice, this list of conditions and the following disclaimer.
79: * 2. Redistributions in binary form must reproduce the above copyright
80: * notice, this list of conditions and the following disclaimer in the
81: * documentation and/or other materials provided with the distribution.
82: *
83: * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
84: * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
85: * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
86: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
87: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
88: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
89: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
90: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
91: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
92: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
93: * POSSIBILITY OF SUCH DAMAGE.
94: */
95:
96: /*-
97: * Copyright (c) 1990 The Regents of the University of California.
98: * All rights reserved.
99: *
100: * This code is derived from software contributed to Berkeley by
101: * William Jolitz.
102: *
103: * Redistribution and use in source and binary forms, with or without
104: * modification, are permitted provided that the following conditions
105: * are met:
106: * 1. Redistributions of source code must retain the above copyright
107: * notice, this list of conditions and the following disclaimer.
108: * 2. Redistributions in binary form must reproduce the above copyright
109: * notice, this list of conditions and the following disclaimer in the
110: * documentation and/or other materials provided with the distribution.
1.12 agc 111: * 3. Neither the name of the University nor the names of its contributors
1.1 fvdl 112: * may be used to endorse or promote products derived from this software
113: * without specific prior written permission.
114: *
115: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
116: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
117: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
118: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
119: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
120: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
121: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
122: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
123: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
124: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
125: * SUCH DAMAGE.
126: *
127: * @(#)locore.s 7.3 (Berkeley) 5/13/91
128: */
129:
1.59 lukem 130: #include <machine/asm.h>
1.115 ! maxv 131: __KERNEL_RCSID(0, "$NetBSD: locore.S,v 1.114 2015/08/30 01:46:03 uebayasi Exp $");
1.59 lukem 132:
1.18 christos 133: #include "opt_compat_oldboot.h"
1.114 uebayasi 134: #include "opt_copy_symtab.h"
1.1 fvdl 135: #include "opt_ddb.h"
1.83 apb 136: #include "opt_modular.h"
1.78 joerg 137: #include "opt_multiboot.h"
1.1 fvdl 138: #include "opt_realmem.h"
1.18 christos 139: #include "opt_vm86.h"
1.62 bouyer 140: #include "opt_xen.h"
1.1 fvdl 141:
142: #include "assym.h"
143: #include "lapic.h"
144: #include "ioapic.h"
1.8 fvdl 145: #include "ksyms.h"
1.1 fvdl 146:
147: #include <sys/errno.h>
148: #include <sys/syscall.h>
149:
150: #include <machine/cputypes.h>
151: #include <machine/segments.h>
152: #include <machine/specialreg.h>
153: #include <machine/trap.h>
154: #include <machine/i82489reg.h>
1.48 yamt 155: #include <machine/frameasm.h>
156: #include <machine/i82489reg.h>
1.62 bouyer 157: #ifndef XEN
158: #include <machine/multiboot.h>
159: #endif
1.1 fvdl 160:
161: /* Get definitions for IOM_BEGIN, IOM_END, and IOM_SIZE */
162: #include <dev/isa/isareg.h>
163:
1.104 uebayasi 164: #ifndef XEN
165: #define _RELOC(x) ((x) - KERNBASE)
166: #else
167: #define _RELOC(x) ((x))
168: #endif /* XEN */
169: #define RELOC(x) _RELOC(_C_LABEL(x))
170:
1.115 ! maxv 171: #ifndef PAE
! 172: #define PROC0_PDIR_OFF 0
! 173: #else
! 174: #define PROC0_L3_OFF 0
! 175: #define PROC0_PDIR_OFF 1 * PAGE_SIZE
! 176: #endif
! 177:
! 178: #define PROC0_STK_OFF (PROC0_PDIR_OFF + PDP_SIZE * PAGE_SIZE)
! 179: #define PROC0_PTP1_OFF (PROC0_STK_OFF + UPAGES * PAGE_SIZE)
! 180:
! 181: /*
! 182: * fillkpt - Fill in a kernel page table
! 183: * eax = pte (page frame | control | status)
! 184: * ebx = page table address
! 185: * ecx = number of pages to map
! 186: *
! 187: * For PAE, each entry is 8 bytes long: we must set the 4 upper bytes to 0.
! 188: * This is done by the first instruction of fillkpt. In the non-PAE case, this
! 189: * instruction just clears the page table entry.
! 190: */
! 191:
! 192: #define fillkpt \
! 193: 1: movl $0,(PDE_SIZE-4)(%ebx) ; /* upper 32 bits: 0 */ \
! 194: movl %eax,(%ebx) ; /* store phys addr */ \
! 195: addl $PDE_SIZE,%ebx ; /* next PTE/PDE */ \
! 196: addl $PAGE_SIZE,%eax ; /* next phys page */ \
! 197: loop 1b ;
! 198:
! 199:
1.62 bouyer 200: #ifdef XEN
201: /*
202: * Xen guest identifier and loader selection
203: */
204: .section __xen_guest
205: .ascii "GUEST_OS=netbsd,GUEST_VER=3.0,XEN_VER=xen-3.0"
1.106 uebayasi 206: .ascii ",VIRT_BASE=0xc0000000" /* KERNBASE */
207: .ascii ",ELF_PADDR_OFFSET=0xc0000000" /* KERNBASE */
208: .ascii ",VIRT_ENTRY=0xc0100000" /* KERNTEXTOFF */
209: .ascii ",HYPERCALL_PAGE=0x00000101"
1.62 bouyer 210: /* (???+HYPERCALL_PAGE_OFFSET)/PAGE_SIZE) */
1.66 bouyer 211: #ifdef PAE
1.106 uebayasi 212: .ascii ",PAE=yes[extended-cr3]"
1.66 bouyer 213: #endif
1.62 bouyer 214: .ascii ",LOADER=generic"
1.114 uebayasi 215: #if (NKSYMS || defined(DDB) || defined(MODULAR)) && !defined(makeoptions_COPY_SYMTAB)
1.62 bouyer 216: .ascii ",BSD_SYMTAB=yes"
217: #endif
218: .byte 0
1.106 uebayasi 219: #endif /* XEN */
1.62 bouyer 220:
1.1 fvdl 221: /*
222: * Initialization
223: */
224: .data
225:
1.100 chs 226: .globl _C_LABEL(cputype)
1.73 ad 227: .globl _C_LABEL(cpuid_level)
1.38 jmmv 228: .globl _C_LABEL(esym)
1.71 ad 229: .globl _C_LABEL(eblob)
1.38 jmmv 230: .globl _C_LABEL(atdevbase)
1.104 uebayasi 231: .globl _C_LABEL(lwp0uarea)
232: .globl _C_LABEL(PDPpaddr)
1.1 fvdl 233: .globl _C_LABEL(gdt)
234: .globl _C_LABEL(idt)
1.30 junyoung 235: .globl _C_LABEL(lapic_tpr)
236:
1.1 fvdl 237: #if NLAPIC > 0
238: #ifdef __ELF__
1.7 thorpej 239: .align PAGE_SIZE
1.1 fvdl 240: #else
241: .align 12
242: #endif
243: .globl _C_LABEL(local_apic), _C_LABEL(lapic_id)
1.104 uebayasi 244: .type _C_LABEL(local_apic), @object
245: LABEL(local_apic)
1.1 fvdl 246: .space LAPIC_ID
1.104 uebayasi 247: END(local_apic)
248: .type _C_LABEL(lapic_id), @object
249: LABEL(lapic_id)
1.1 fvdl 250: .long 0x00000000
1.106 uebayasi 251: .space LAPIC_TPRI-(LAPIC_ID+4)
1.104 uebayasi 252: END(lapic_id)
253: .type _C_LABEL(lapic_tpr), @object
254: LABEL(lapic_tpr)
1.106 uebayasi 255: .space LAPIC_PPRI-LAPIC_TPRI
1.104 uebayasi 256: END(lapic_tpr)
257: .type _C_LABEL(lapic_ppr), @object
1.30 junyoung 258: _C_LABEL(lapic_ppr):
1.1 fvdl 259: .space LAPIC_ISR-LAPIC_PPRI
1.104 uebayasi 260: END(lapic_ppr)
261: .type _C_LABEL(lapic_isr), @object
1.1 fvdl 262: _C_LABEL(lapic_isr):
1.7 thorpej 263: .space PAGE_SIZE-LAPIC_ISR
1.104 uebayasi 264: END(lapic_isr)
1.1 fvdl 265: #else
1.104 uebayasi 266: .type _C_LABEL(lapic_tpr), @object
267: LABEL(lapic_tpr)
1.1 fvdl 268: .long 0
1.104 uebayasi 269: END(lapic_tpr)
1.1 fvdl 270: #endif
1.104 uebayasi 271: .type _C_LABEL(cputype), @object
1.115 ! maxv 272: LABEL(cputype) .long 0 /* are we 80486, Pentium, or.. */
1.104 uebayasi 273: END(cputype)
274: .type _C_LABEL(cpuid_level), @object
275: LABEL(cpuid_level) .long 0
276: END(cpuid_level)
277: .type _C_LABEL(atdevbase), @object
1.115 ! maxv 278: LABEL(atdevbase) .long 0 /* location of start of iomem in virt */
1.104 uebayasi 279: END(atdevbase)
280: .type _C_LABEL(lwp0uarea), @object
281: LABEL(lwp0uarea) .long 0
282: END(lwp0uarea)
283: .type _C_LABEL(PDPpaddr), @object
1.115 ! maxv 284: LABEL(PDPpaddr) .long 0 /* paddr of PDP, for libkvm */
1.104 uebayasi 285: END(PDPpaddr)
286: .type _C_LABEL(tablesize), @object
1.53 yamt 287: _C_LABEL(tablesize): .long 0
1.104 uebayasi 288: END(tablesize)
1.115 ! maxv 289:
! 290: /* Space for the temporary stack */
1.104 uebayasi 291: .size tmpstk, tmpstk - .
1.115 ! maxv 292: .space 512
1.1 fvdl 293: tmpstk:
1.96 cherry 294: #ifdef XEN
1.115 ! maxv 295: .align PAGE_SIZE, 0x0 /* Align on page boundary */
1.104 uebayasi 296: LABEL(tmpgdt)
1.115 ! maxv 297: .space PAGE_SIZE /* Xen expects a page */
1.104 uebayasi 298: END(tmpgdt)
1.96 cherry 299: #endif /* XEN */
1.1 fvdl 300:
301: .text
302: .globl _C_LABEL(kernel_text)
303: .set _C_LABEL(kernel_text),KERNTEXTOFF
304:
1.104 uebayasi 305: ENTRY(start)
1.62 bouyer 306: #ifndef XEN
1.115 ! maxv 307:
! 308: /* Warm boot */
! 309: movw $0x1234,0x472
! 310:
1.37 jmmv 311: #if defined(MULTIBOOT)
312: jmp 1f
313:
314: .align 4
315: .globl Multiboot_Header
316: _C_LABEL(Multiboot_Header):
1.44 jmmv 317: #define MULTIBOOT_HEADER_FLAGS (MULTIBOOT_HEADER_WANT_MEMORY)
1.37 jmmv 318: .long MULTIBOOT_HEADER_MAGIC
319: .long MULTIBOOT_HEADER_FLAGS
320: .long -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS)
321:
322: 1:
323: /* Check if we are being executed by a Multiboot-compliant boot
324: * loader. */
325: cmpl $MULTIBOOT_INFO_MAGIC,%eax
326: jne 1f
327:
1.43 mrg 328: /*
329: * Indeed, a multiboot-compliant boot loader executed us. We copy
1.37 jmmv 330: * the received Multiboot information structure into kernel's data
331: * space to process it later -- after we are relocated. It will
1.43 mrg 332: * be safer to run complex C code than doing it at this point.
333: */
1.115 ! maxv 334: pushl %ebx /* Address of Multiboot information */
1.37 jmmv 335: call _C_LABEL(multiboot_pre_reloc)
336: addl $4,%esp
1.38 jmmv 337: jmp 2f
1.37 jmmv 338: #endif
339:
340: 1:
1.1 fvdl 341: /*
1.38 jmmv 342: * At this point, we know that a NetBSD-specific boot loader
343: * booted this kernel. The stack carries the following parameters:
1.41 jmmv 344: * (boothowto, [bootdev], bootinfo, esym, biosextmem, biosbasemem),
1.38 jmmv 345: * 4 bytes each.
1.1 fvdl 346: */
1.115 ! maxv 347: addl $4,%esp /* Discard return address to boot loader */
1.38 jmmv 348: call _C_LABEL(native_loader)
349: addl $24,%esp
1.1 fvdl 350:
351: 2:
352: /* First, reset the PSL. */
353: pushl $PSL_MBO
354: popfl
355:
356: /* Clear segment registers; always null in proc0. */
357: xorl %eax,%eax
358: movw %ax,%fs
359: movw %ax,%gs
360: decl %eax
1.73 ad 361: movl %eax,RELOC(cpuid_level)
1.1 fvdl 362:
363: /* Find out our CPU type. */
364:
365: try386: /* Try to toggle alignment check flag; does not exist on 386. */
366: pushfl
367: popl %eax
368: movl %eax,%ecx
369: orl $PSL_AC,%eax
370: pushl %eax
371: popfl
372: pushfl
373: popl %eax
374: xorl %ecx,%eax
375: andl $PSL_AC,%eax
376: pushl %ecx
377: popfl
378:
379: testl %eax,%eax
380: jnz try486
381:
382: /*
383: * Try the test of a NexGen CPU -- ZF will not change on a DIV
384: * instruction on a NexGen, it will on an i386. Documented in
385: * Nx586 Processor Recognition Application Note, NexGen, Inc.
386: */
387: movl $0x5555,%eax
388: xorl %edx,%edx
389: movl $2,%ecx
390: divl %ecx
391: jnz is386
392:
393: isnx586:
394: /*
395: * Don't try cpuid, as Nx586s reportedly don't support the
396: * PSL_ID bit.
397: */
1.100 chs 398: movl $CPU_NX586,RELOC(cputype)
1.1 fvdl 399: jmp 2f
400:
401: is386:
1.100 chs 402: movl $CPU_386,RELOC(cputype)
1.1 fvdl 403: jmp 2f
404:
405: try486: /* Try to toggle identification flag; does not exist on early 486s. */
406: pushfl
407: popl %eax
408: movl %eax,%ecx
409: xorl $PSL_ID,%eax
410: pushl %eax
411: popfl
412: pushfl
413: popl %eax
414: xorl %ecx,%eax
415: andl $PSL_ID,%eax
416: pushl %ecx
417: popfl
418:
419: testl %eax,%eax
420: jnz try586
1.100 chs 421: is486: movl $CPU_486,RELOC(cputype)
1.1 fvdl 422: /*
423: * Check Cyrix CPU
424: * Cyrix CPUs do not change the undefined flags following
425: * execution of the divide instruction which divides 5 by 2.
426: *
427: * Note: CPUID is enabled on M2, so it passes another way.
428: */
429: pushfl
430: movl $0x5555, %eax
431: xorl %edx, %edx
432: movl $2, %ecx
433: clc
434: divl %ecx
435: jnc trycyrix486
436: popfl
437: jmp 2f
438: trycyrix486:
1.115 ! maxv 439: movl $CPU_6x86,RELOC(cputype) /* set CPU type */
1.1 fvdl 440: /*
441: * Check for Cyrix 486 CPU by seeing if the flags change during a
442: * divide. This is documented in the Cx486SLC/e SMM Programmer's
443: * Guide.
444: */
445: xorl %edx,%edx
1.115 ! maxv 446: cmpl %edx,%edx /* set flags to known state */
1.1 fvdl 447: pushfl
1.115 ! maxv 448: popl %ecx /* store flags in ecx */
1.1 fvdl 449: movl $-1,%eax
450: movl $4,%ebx
1.115 ! maxv 451: divl %ebx /* do a long division */
1.1 fvdl 452: pushfl
453: popl %eax
1.115 ! maxv 454: xorl %ecx,%eax /* are the flags different? */
! 455: testl $0x8d5,%eax /* only check C|PF|AF|Z|N|V */
! 456: jne 2f /* yes; must be Cyrix 6x86 CPU */
! 457: movl $CPU_486DLC,RELOC(cputype) /* set CPU type */
1.1 fvdl 458:
459: #ifndef CYRIX_CACHE_WORKS
460: /* Disable caching of the ISA hole only. */
461: invd
1.115 ! maxv 462: movb $CCR0,%al /* Configuration Register index (CCR0) */
1.1 fvdl 463: outb %al,$0x22
464: inb $0x23,%al
465: orb $(CCR0_NC1|CCR0_BARB),%al
466: movb %al,%ah
467: movb $CCR0,%al
468: outb %al,$0x22
469: movb %ah,%al
470: outb %al,$0x23
471: invd
472: #else /* CYRIX_CACHE_WORKS */
473: /* Set cache parameters */
1.115 ! maxv 474: invd /* Start with guaranteed clean cache */
! 475: movb $CCR0,%al /* Configuration Register index (CCR0) */
1.1 fvdl 476: outb %al,$0x22
477: inb $0x23,%al
478: andb $~CCR0_NC0,%al
479: #ifndef CYRIX_CACHE_REALLY_WORKS
480: orb $(CCR0_NC1|CCR0_BARB),%al
481: #else
482: orb $CCR0_NC1,%al
483: #endif
484: movb %al,%ah
485: movb $CCR0,%al
486: outb %al,$0x22
487: movb %ah,%al
488: outb %al,$0x23
489: /* clear non-cacheable region 1 */
490: movb $(NCR1+2),%al
491: outb %al,$0x22
492: movb $NCR_SIZE_0K,%al
493: outb %al,$0x23
494: /* clear non-cacheable region 2 */
495: movb $(NCR2+2),%al
496: outb %al,$0x22
497: movb $NCR_SIZE_0K,%al
498: outb %al,$0x23
499: /* clear non-cacheable region 3 */
500: movb $(NCR3+2),%al
501: outb %al,$0x22
502: movb $NCR_SIZE_0K,%al
503: outb %al,$0x23
504: /* clear non-cacheable region 4 */
505: movb $(NCR4+2),%al
506: outb %al,$0x22
507: movb $NCR_SIZE_0K,%al
508: outb %al,$0x23
509: /* enable caching in CR0 */
510: movl %cr0,%eax
511: andl $~(CR0_CD|CR0_NW),%eax
512: movl %eax,%cr0
513: invd
514: #endif /* CYRIX_CACHE_WORKS */
515:
516: jmp 2f
517:
518: try586: /* Use the `cpuid' instruction. */
519: xorl %eax,%eax
520: cpuid
1.73 ad 521: movl %eax,RELOC(cpuid_level)
1.1 fvdl 522:
523: 2:
524: /*
525: * Finished with old stack; load new %esp now instead of later so we
526: * can trace this code without having to worry about the trace trap
527: * clobbering the memory test or the zeroing of the bss+bootstrap page
528: * tables.
529: *
530: * The boot program should check:
531: * text+data <= &stack_variable - more_space_for_stack
532: * text+data+bss+pad+space_for_page_tables <= end_of_memory
1.115 ! maxv 533: *
! 534: * XXX: the gdt is in the carcass of the boot program so clearing
1.1 fvdl 535: * the rest of memory is still not possible.
536: */
1.115 ! maxv 537: movl $_RELOC(tmpstk),%esp
1.1 fvdl 538:
539: /*
1.93 jym 540: * Virtual address space of kernel, without PAE. The page dir is 1 page long.
1.1 fvdl 541: *
1.71 ad 542: * text | data | bss | [syms] | [blobs] | page dir | proc0 kstack | L1 ptp
543: * 0 1 2 3
1.93 jym 544: *
545: * Virtual address space of kernel, with PAE. We need 4 pages for the page dir
546: * and 1 page for the L3.
547: * text | data | bss | [syms] | [blobs] | L3 | page dir | proc0 kstack | L1 ptp
548: * 0 1 5 6 7
1.1 fvdl 549: */
550:
551: /* Find end of kernel image. */
552: movl $RELOC(end),%edi
1.71 ad 553:
1.114 uebayasi 554: #if (NKSYMS || defined(DDB) || defined(MODULAR)) && !defined(makeoptions_COPY_SYMTAB)
1.1 fvdl 555: /* Save the symbols (if loaded). */
556: movl RELOC(esym),%eax
557: testl %eax,%eax
558: jz 1f
1.35 yamt 559: subl $KERNBASE,%eax
1.1 fvdl 560: movl %eax,%edi
561: 1:
562: #endif
563:
1.71 ad 564: /* Skip over any modules/blobs. */
565: movl RELOC(eblob),%eax
566: testl %eax,%eax
567: jz 1f
568: subl $KERNBASE,%eax
569: movl %eax,%edi
570: 1:
1.53 yamt 571: /* Compute sizes */
1.71 ad 572: movl %edi,%esi
1.115 ! maxv 573: addl $PGOFSET,%esi
1.1 fvdl 574: andl $~PGOFSET,%esi
575:
1.53 yamt 576: /* nkptp[1] = (esi + ~L2_FRAME) >> L2_SHIFT + 1; */
577: movl %esi,%eax
578: addl $~L2_FRAME,%eax
579: shrl $L2_SHIFT,%eax
580: incl %eax /* one more ptp for VAs stolen by bootstrap */
581: 1: movl %eax,RELOC(nkptp)+1*4
582:
1.93 jym 583: /* tablesize = (PDP_SIZE + UPAGES + nkptp) << PGSHIFT; */
584: addl $(PDP_SIZE+UPAGES),%eax
585: #ifdef PAE
586: incl %eax /* one more page for the L3 PD */
587: shll $PGSHIFT+1,%eax /* PTP tables are twice larger with PAE */
588: #else
1.53 yamt 589: shll $PGSHIFT,%eax
1.93 jym 590: #endif
1.53 yamt 591: movl %eax,RELOC(tablesize)
592:
593: /* ensure that nkptp covers bootstrap tables */
594: addl %esi,%eax
595: addl $~L2_FRAME,%eax
596: shrl $L2_SHIFT,%eax
597: incl %eax
598: cmpl %eax,RELOC(nkptp)+1*4
599: jnz 1b
600:
1.105 uebayasi 601: /* Clear tables */
602: movl %esi,%edi
1.1 fvdl 603: xorl %eax,%eax
604: cld
1.105 uebayasi 605: movl RELOC(tablesize),%ecx
606: shrl $2,%ecx
1.1 fvdl 607: rep
608: stosl
609:
1.105 uebayasi 610: leal (PROC0_PTP1_OFF)(%esi), %ebx
1.1 fvdl 611:
612: /*
613: * Build initial page tables.
614: */
1.105 uebayasi 615: /*
616: * Compute &__data_start - KERNBASE. This can't be > 4G,
1.53 yamt 617: * or we can't deal with it anyway, since we can't load it in
618: * 32 bit mode. So use the bottom 32 bits.
1.105 uebayasi 619: */
620: movl $RELOC(__data_start),%edx
1.1 fvdl 621: andl $~PGOFSET,%edx
1.30 junyoung 622:
1.105 uebayasi 623: /*
624: * Skip the first MB.
625: */
1.1 fvdl 626: movl $_RELOC(KERNTEXTOFF),%eax
627: movl %eax,%ecx
1.93 jym 628: shrl $(PGSHIFT-2),%ecx /* ((n >> PGSHIFT) << 2) for # pdes */
629: #ifdef PAE
1.105 uebayasi 630: shll $1,%ecx /* pdes are twice larger with PAE */
1.93 jym 631: #endif
1.105 uebayasi 632: addl %ecx,%ebx
1.1 fvdl 633:
634: /* Map the kernel text read-only. */
635: movl %edx,%ecx
636: subl %eax,%ecx
637: shrl $PGSHIFT,%ecx
638: orl $(PG_V|PG_KR),%eax
639: fillkpt
640:
641: /* Map the data, BSS, and bootstrap tables read-write. */
642: leal (PG_V|PG_KW)(%edx),%eax
1.53 yamt 643: movl RELOC(tablesize),%ecx
1.115 ! maxv 644: addl %esi,%ecx /* end of tables */
! 645: subl %edx,%ecx /* subtract end of text */
1.1 fvdl 646: shrl $PGSHIFT,%ecx
647: fillkpt
648:
1.53 yamt 649: /* Map ISA I/O mem (later atdevbase) */
1.115 ! maxv 650: movl $(IOM_BEGIN|PG_V|PG_KW/*|PG_N*/),%eax
! 651: movl $(IOM_SIZE>>PGSHIFT),%ecx
1.1 fvdl 652: fillkpt
653:
654: /*
655: * Construct a page table directory.
656: */
1.105 uebayasi 657: /* Set up top level entries for identity mapping */
658: leal (PROC0_PDIR_OFF)(%esi),%ebx
659: leal (PROC0_PTP1_OFF)(%esi),%eax
660: orl $(PG_V|PG_KW), %eax
661: movl RELOC(nkptp)+1*4,%ecx
1.1 fvdl 662: fillkpt
663:
1.105 uebayasi 664: /* Set up top level entries for actual kernel mapping */
665: leal (PROC0_PDIR_OFF + L2_SLOT_KERNBASE*PDE_SIZE)(%esi),%ebx
666: leal (PROC0_PTP1_OFF)(%esi),%eax
667: orl $(PG_V|PG_KW), %eax
668: movl RELOC(nkptp)+1*4,%ecx
1.1 fvdl 669: fillkpt
670:
671: /* Install a PDE recursively mapping page directory as a page table! */
1.105 uebayasi 672: leal (PROC0_PDIR_OFF + PDIR_SLOT_PTE*PDE_SIZE)(%esi),%ebx
673: leal (PROC0_PDIR_OFF)(%esi),%eax
674: orl $(PG_V|PG_KW),%eax
1.93 jym 675: movl $PDP_SIZE,%ecx
676: fillkpt
677:
678: #ifdef PAE
679: /* Fill in proc0 L3 page with entries pointing to the page dirs */
680: leal (PROC0_L3_OFF)(%esi),%ebx
681: leal (PROC0_PDIR_OFF)(%esi),%eax
682: orl $(PG_V),%eax
683: movl $PDP_SIZE,%ecx
684: fillkpt
685:
686: /* Enable PAE mode */
687: movl %cr4,%eax
688: orl $CR4_PAE,%eax
689: movl %eax,%cr4
690: #endif
1.1 fvdl 691:
1.31 junyoung 692: /* Save phys. addr of PDP, for libkvm. */
1.93 jym 693: leal (PROC0_PDIR_OFF)(%esi),%eax
694: movl %eax,RELOC(PDPpaddr)
1.1 fvdl 695:
1.93 jym 696: /*
697: * Startup checklist:
698: * 1. Load %cr3 with pointer to PDIR (or L3 PD page for PAE).
699: */
1.115 ! maxv 700: movl %esi,%eax /* phys address of PTD in proc0 */
! 701: movl %eax,%cr3 /* load PTD addr into MMU */
1.93 jym 702:
1.105 uebayasi 703: /*
704: * 2. Enable paging and the rest of it.
705: */
1.115 ! maxv 706: movl %cr0,%eax
1.111 dsl 707: orl $(CR0_PE|CR0_PG|CR0_NE|CR0_TS|CR0_MP|CR0_WP|CR0_AM),%eax
1.115 ! maxv 708: movl %eax,%cr0
1.1 fvdl 709:
1.115 ! maxv 710: pushl $begin /* jump to high mem */
1.1 fvdl 711: ret
712:
713: begin:
1.105 uebayasi 714: /*
715: * We have arrived.
716: * There's no need anymore for the identity mapping in low
717: * memory, remove it.
718: */
719: movl _C_LABEL(nkptp)+1*4,%ecx
1.115 ! maxv 720: leal (PROC0_PDIR_OFF)(%esi),%ebx /* old, phys address of PDIR */
! 721: addl $(KERNBASE), %ebx /* new, virt address of PDIR */
! 722: 1: movl $0,(PDE_SIZE-4)(%ebx) /* upper bits (for PAE) */
1.93 jym 723: movl $0,(%ebx)
1.105 uebayasi 724: addl $PDE_SIZE,%ebx
1.1 fvdl 725: loop 1b
726:
727: /* Relocate atdevbase. */
1.53 yamt 728: movl $KERNBASE,%edx
729: addl _C_LABEL(tablesize),%edx
1.1 fvdl 730: addl %esi,%edx
731: movl %edx,_C_LABEL(atdevbase)
732:
733: /* Set up bootstrap stack. */
1.105 uebayasi 734: leal (PROC0_STK_OFF+KERNBASE)(%esi),%eax
1.91 rmind 735: movl %eax,_C_LABEL(lwp0uarea)
1.112 dsl 736: leal (USPACE-FRAMESIZE)(%eax),%esp
1.115 ! maxv 737: movl %esi,PCB_CR3(%eax) /* pcb->pcb_cr3 */
! 738: xorl %ebp,%ebp /* mark end of frames */
1.1 fvdl 739:
1.37 jmmv 740: #if defined(MULTIBOOT)
741: /* It is now safe to parse the Multiboot information structure
742: * we saved before from C code. Note that we cannot delay its
743: * parsing any more because initgdt (called below) needs to make
744: * use of this information. */
745: call _C_LABEL(multiboot_post_reloc)
746: #endif
747:
1.115 ! maxv 748: subl $NGDT*8, %esp /* space for temporary gdt */
1.1 fvdl 749: pushl %esp
750: call _C_LABEL(initgdt)
751: addl $4,%esp
1.30 junyoung 752:
1.105 uebayasi 753: movl _C_LABEL(tablesize),%eax
1.115 ! maxv 754: addl %esi,%eax /* skip past stack and page tables */
1.1 fvdl 755:
1.93 jym 756: #ifdef PAE
1.115 ! maxv 757: pushl $0 /* init386() expects a 64 bits paddr_t with PAE */
1.93 jym 758: #endif
1.1 fvdl 759: pushl %eax
1.115 ! maxv 760: call _C_LABEL(init386) /* wire 386 chip for unix operation */
! 761: addl $PDE_SIZE,%esp /* pop paddr_t */
! 762: addl $NGDT*8,%esp /* pop temporary gdt */
1.1 fvdl 763:
764: #ifdef SAFARI_FIFO_HACK
765: movb $5,%al
766: movw $0x37b,%dx
767: outb %al,%dx
768: movw $0x37f,%dx
769: inb %dx,%al
770: movb %al,%cl
771:
772: orb $1,%cl
773:
774: movb $5,%al
775: movw $0x37b,%dx
776: outb %al,%dx
777: movw $0x37f,%dx
778: movb %cl,%al
779: outb %al,%dx
780: #endif /* SAFARI_FIFO_HACK */
781:
782: call _C_LABEL(main)
1.62 bouyer 783: #else /* XEN */
784: /* First, reset the PSL. */
785: pushl $PSL_MBO
786: popfl
787:
788: cld
1.115 ! maxv 789: movl %esp, %ebx /* save start of available space */
! 790: movl $_RELOC(tmpstk),%esp /* bootstrap stack end location */
1.62 bouyer 791:
1.106 uebayasi 792: /* Clear BSS. */
1.62 bouyer 793: xorl %eax,%eax
794: movl $RELOC(__bss_start),%edi
795: movl $RELOC(_end),%ecx
796: subl %edi,%ecx
797: rep stosb
798:
799: /* Copy the necessary stuff from start_info structure. */
1.105 uebayasi 800: /* We need to copy shared_info early, so that sti/cli work */
1.62 bouyer 801: movl $RELOC(start_info_union),%edi
802: movl $128,%ecx
803: rep movsl
804:
805: /* Clear segment registers; always null in proc0. */
806: xorl %eax,%eax
807: movw %ax,%fs
808: movw %ax,%gs
809: decl %eax
1.73 ad 810: movl %eax,RELOC(cpuid_level)
1.62 bouyer 811:
812: xorl %eax,%eax
813: cpuid
1.73 ad 814: movl %eax,RELOC(cpuid_level)
1.62 bouyer 815:
1.96 cherry 816: /*
817: * Use a temp page. We'll re- add it to uvm(9) once we're
818: * done using it.
819: */
820: movl $RELOC(tmpgdt), %eax
1.115 ! maxv 821: pushl %eax /* start of temporary gdt */
1.96 cherry 822: call _C_LABEL(initgdt)
823: addl $4,%esp
824:
1.62 bouyer 825: call xen_pmap_bootstrap
1.92 jym 826:
1.62 bouyer 827: /*
828: * First avail returned by xen_pmap_bootstrap in %eax
829: */
830: movl %eax, %esi;
1.91 rmind 831: movl %esi, _C_LABEL(lwp0uarea)
1.62 bouyer 832:
833: /* Set up bootstrap stack. */
1.112 dsl 834: leal (USPACE-FRAMESIZE)(%eax),%esp
1.115 ! maxv 835: xorl %ebp,%ebp /* mark end of frames */
1.62 bouyer 836:
837: addl $USPACE, %esi
1.115 ! maxv 838: subl $KERNBASE, %esi /* init386 wants a physical address */
1.92 jym 839:
840: #ifdef PAE
1.115 ! maxv 841: pushl $0 /* init386() expects a 64 bits paddr_t with PAE */
1.92 jym 842: #endif
1.62 bouyer 843: pushl %esi
1.115 ! maxv 844: call _C_LABEL(init386) /* wire 386 chip for unix operation */
! 845: addl $PDE_SIZE,%esp /* pop paddr_t */
1.62 bouyer 846: call _C_LABEL(main)
1.106 uebayasi 847: #endif /* XEN */
1.104 uebayasi 848: END(start)
1.62 bouyer 849:
1.101 jym 850: #if defined(XEN)
1.62 bouyer 851: /* space for the hypercall call page */
852: #define HYPERCALL_PAGE_OFFSET 0x1000
853: .org HYPERCALL_PAGE_OFFSET
854: ENTRY(hypercall_page)
855: .skip 0x1000
1.104 uebayasi 856: END(hypercall_page)
1.62 bouyer 857:
858: /*
859: * void lgdt_finish(void);
860: * Finish load a new GDT pointer (do any necessary cleanup).
861: * XXX It's somewhat questionable whether reloading all the segment registers
862: * is necessary, since the actual descriptor data is not changed except by
863: * process creation and exit, both of which clean up via task switches. OTOH,
864: * this only happens at run time when the GDT is resized.
865: */
866: /* LINTSTUB: Func: void lgdt_finish(void) */
867: NENTRY(lgdt_finish)
868: movl $GSEL(GDATA_SEL, SEL_KPL),%eax
869: movw %ax,%ds
870: movw %ax,%es
871: movw %ax,%gs
872: movw %ax,%ss
873: movl $GSEL(GCPU_SEL, SEL_KPL),%eax
874: movw %ax,%fs
875: /* Reload code selector by doing intersegment return. */
876: popl %eax
877: pushl $GSEL(GCODE_SEL, SEL_KPL)
878: pushl %eax
879: lret
1.72 yamt 880: END(lgdt_finish)
1.62 bouyer 881:
882: #endif /* XEN */
1.1 fvdl 883:
884: /*
1.48 yamt 885: * void lwp_trampoline(void);
886: *
1.1 fvdl 887: * This is a trampoline function pushed onto the stack of a newly created
888: * process in order to do some additional setup. The trampoline is entered by
1.109 christos 889: * cpu_switchto()ing to the process, so we abuse the callee-saved
890: * registers used by cpu_switchto() to store the information about the
891: * stub to call.
1.1 fvdl 892: * NOTE: This function does not have a normal calling sequence!
893: */
1.48 yamt 894: NENTRY(lwp_trampoline)
1.68 ad 895: movl %ebp,%edi /* for .Lsyscall_checkast */
1.48 yamt 896: xorl %ebp,%ebp
1.68 ad 897: pushl %edi
1.48 yamt 898: pushl %eax
899: call _C_LABEL(lwp_startup)
900: addl $8,%esp
1.1 fvdl 901: pushl %ebx
902: call *%esi
903: addl $4,%esp
1.68 ad 904: jmp .Lsyscall_checkast
1.1 fvdl 905: /* NOTREACHED */
1.72 yamt 906: END(lwp_trampoline)
1.1 fvdl 907:
908: /*
1.48 yamt 909: * sigcode()
910: *
911: * Signal trampoline; copied to top of user stack. Used only for
912: * compatibility with old releases of NetBSD.
1.1 fvdl 913: */
914: NENTRY(sigcode)
915: /*
916: * Handler has returned here as if we called it. The sigcontext
917: * is on the stack after the 3 args "we" pushed.
918: */
1.115 ! maxv 919: leal 12(%esp),%eax /* get pointer to sigcontext */
! 920: movl %eax,4(%esp) /* put it in the argument slot */
! 921: /* fake return address already there */
1.17 christos 922: movl $SYS_compat_16___sigreturn14,%eax
1.115 ! maxv 923: int $0x80 /* enter kernel with args on stack */
1.1 fvdl 924: movl $SYS_exit,%eax
1.115 ! maxv 925: int $0x80 /* exit if sigreturn fails */
1.1 fvdl 926: .globl _C_LABEL(esigcode)
927: _C_LABEL(esigcode):
1.72 yamt 928: END(sigcode)
1.1 fvdl 929:
930: /*
1.48 yamt 931: * int setjmp(label_t *)
932: *
933: * Used primarily by DDB.
1.1 fvdl 934: */
935: ENTRY(setjmp)
936: movl 4(%esp),%eax
1.115 ! maxv 937: movl %ebx,(%eax) /* save ebx */
! 938: movl %esp,4(%eax) /* save esp */
! 939: movl %ebp,8(%eax) /* save ebp */
! 940: movl %esi,12(%eax) /* save esi */
! 941: movl %edi,16(%eax) /* save edi */
! 942: movl (%esp),%edx /* get rta */
! 943: movl %edx,20(%eax) /* save eip */
! 944: xorl %eax,%eax /* return 0 */
1.1 fvdl 945: ret
1.72 yamt 946: END(setjmp)
1.1 fvdl 947:
1.48 yamt 948: /*
949: * int longjmp(label_t *)
950: *
951: * Used primarily by DDB.
952: */
1.1 fvdl 953: ENTRY(longjmp)
954: movl 4(%esp),%eax
1.115 ! maxv 955: movl (%eax),%ebx /* restore ebx */
! 956: movl 4(%eax),%esp /* restore esp */
! 957: movl 8(%eax),%ebp /* restore ebp */
! 958: movl 12(%eax),%esi /* restore esi */
! 959: movl 16(%eax),%edi /* restore edi */
! 960: movl 20(%eax),%edx /* get rta */
! 961: movl %edx,(%esp) /* put in return frame */
! 962: movl $1,%eax /* return 1 */
1.1 fvdl 963: ret
1.72 yamt 964: END(longjmp)
1.1 fvdl 965:
1.65 skrll 966: /*
967: * void dumpsys(void)
968: *
969: * Mimic cpu_switchto() for postmortem debugging.
970: */
1.64 skrll 971: ENTRY(dumpsys)
1.115 ! maxv 972: pushl %ebx /* set up fake switchframe */
! 973: pushl %esi /* and save context */
! 974: pushl %edi
1.65 skrll 975: movl %esp,_C_LABEL(dumppcb)+PCB_ESP
976: movl %ebp,_C_LABEL(dumppcb)+PCB_EBP
1.115 ! maxv 977: call _C_LABEL(dodumpsys) /* dump! */
! 978: addl $(3*4), %esp /* unwind switchframe */
1.64 skrll 979: ret
1.72 yamt 980: END(dumpsys)
1.64 skrll 981:
1.1 fvdl 982: /*
1.106 uebayasi 983: * struct lwp *cpu_switchto(struct lwp *oldlwp, struct lwp *newlwp,
1.58 ad 984: * bool returning)
1.30 junyoung 985: *
1.48 yamt 986: * 1. if (oldlwp != NULL), save its context.
987: * 2. then, restore context of newlwp.
988: *
989: * Note that the stack frame layout is known to "struct switchframe" in
990: * <machine/frame.h> and to the code in cpu_lwp_fork() which initializes
1.5 thorpej 991: * it for a new lwp.
1.1 fvdl 992: */
1.48 yamt 993: ENTRY(cpu_switchto)
1.1 fvdl 994: pushl %ebx
995: pushl %esi
996: pushl %edi
997:
1.70 ad 998: #if defined(DIAGNOSTIC) && !defined(XEN)
999: cmpl $IPL_SCHED,CPUVAR(ILEVEL)
1000: jbe 0f
1.74 christos 1001: pushl CPUVAR(ILEVEL)
1.70 ad 1002: pushl $.Lstr
1003: call _C_LABEL(panic)
1.74 christos 1004: addl $8,%esp
1005: .Lstr: .string "cpu_switchto: switching above IPL_SCHED (%d)\0"
1.70 ad 1006: 0:
1007: #endif
1008:
1.115 ! maxv 1009: movl 16(%esp),%esi /* oldlwp */
! 1010: movl 20(%esp),%edi /* newlwp */
! 1011: movl 24(%esp),%edx /* returning */
1.48 yamt 1012: testl %esi,%esi
1013: jz 1f
1.1 fvdl 1014:
1.48 yamt 1015: /* Save old context. */
1.91 rmind 1016: movl L_PCB(%esi),%eax
1.48 yamt 1017: movl %esp,PCB_ESP(%eax)
1018: movl %ebp,PCB_EBP(%eax)
1019:
1020: /* Switch to newlwp's stack. */
1.91 rmind 1021: 1: movl L_PCB(%edi),%ebx
1.48 yamt 1022: movl PCB_EBP(%ebx),%ebp
1023: movl PCB_ESP(%ebx),%esp
1.1 fvdl 1024:
1.61 ad 1025: /*
1026: * Set curlwp. This must be globally visible in order to permit
1027: * non-interlocked mutex release.
1028: */
1029: movl %edi,%ecx
1030: xchgl %ecx,CPUVAR(CURLWP)
1.58 ad 1031:
1032: /* Skip the rest if returning to a pinned LWP. */
1033: testl %edx,%edx
1034: jnz 4f
1035:
1.62 bouyer 1036: #ifdef XEN
1037: pushl %edi
1038: call _C_LABEL(i386_switch_context)
1039: addl $4,%esp
1.97 bouyer 1040: #else /* !XEN */
1.60 yamt 1041: /* Switch ring0 esp */
1042: movl PCB_ESP0(%ebx),%eax
1043: movl %eax,CPUVAR(ESP0)
1.97 bouyer 1044: #endif /* !XEN */
1.1 fvdl 1045:
1046: /* Don't bother with the rest if switching to a system process. */
1.48 yamt 1047: testl $LW_SYSTEM,L_FLAG(%edi)
1048: jnz 4f
1.1 fvdl 1049:
1.97 bouyer 1050: #ifndef XEN
1.54 ad 1051: /* Restore thread-private %fs/%gs descriptors. */
1.60 yamt 1052: movl CPUVAR(GDT),%ecx
1.55 ad 1053: movl PCB_FSD(%ebx), %eax
1054: movl PCB_FSD+4(%ebx), %edx
1.54 ad 1055: movl %eax, (GUFS_SEL*8)(%ecx)
1056: movl %edx, (GUFS_SEL*8+4)(%ecx)
1.55 ad 1057: movl PCB_GSD(%ebx), %eax
1058: movl PCB_GSD+4(%ebx), %edx
1.54 ad 1059: movl %eax, (GUGS_SEL*8)(%ecx)
1060: movl %edx, (GUGS_SEL*8+4)(%ecx)
1.97 bouyer 1061: #endif /* !XEN */
1.54 ad 1062:
1.60 yamt 1063: /* Switch I/O bitmap */
1064: movl PCB_IOMAP(%ebx),%eax
1065: orl %eax,%eax
1.95 joerg 1066: jnz .Lcopy_iobitmap
1.60 yamt 1067: movl $(IOMAP_INVALOFF << 16),CPUVAR(IOBASE)
1068: .Liobitmap_done:
1069:
1.56 ad 1070: /* Is this process using RAS (restartable atomic sequences)? */
1071: movl L_PROC(%edi),%eax
1072: cmpl $0,P_RASLIST(%eax)
1073: jne 5f
1074:
1.48 yamt 1075: /*
1.90 rmind 1076: * Restore cr0 (including FPU state). Raise the IPL to IPL_HIGH.
1.48 yamt 1077: * FPU IPIs can alter the LWP's saved cr0. Dropping the priority
1078: * is deferred until mi_switch(), when cpu_switchto() returns.
1079: */
1.62 bouyer 1080: 2:
1.97 bouyer 1081: #ifdef XEN
1082: pushl %edi
1083: call _C_LABEL(i386_tls_switch)
1084: addl $4,%esp
1085: #else /* !XEN */
1.108 christos 1086: movl $IPL_HIGH,CPUVAR(ILEVEL)
1087: movl PCB_CR0(%ebx),%ecx /* has CR0_TS clear */
1.48 yamt 1088: movl %cr0,%edx
1.1 fvdl 1089:
1.108 christos 1090: /*
1091: * If our floating point registers are on a different CPU,
1092: * set CR0_TS so we'll trap rather than reuse bogus state.
1093: */
1094: cmpl CPUVAR(FPCURLWP),%edi
1095: je 3f
1096: orl $CR0_TS,%ecx
1097:
1.48 yamt 1098: /* Reloading CR0 is very expensive - avoid if possible. */
1.108 christos 1099: 3: cmpl %edx,%ecx
1.48 yamt 1100: je 4f
1.1 fvdl 1101: movl %ecx,%cr0
1.97 bouyer 1102: #endif /* !XEN */
1.1 fvdl 1103:
1.48 yamt 1104: /* Return to the new LWP, returning 'oldlwp' in %eax. */
1105: 4: movl %esi,%eax
1.1 fvdl 1106: popl %edi
1107: popl %esi
1108: popl %ebx
1109: ret
1.20 dsl 1110:
1.48 yamt 1111: /* Check for restartable atomic sequences (RAS). */
1112: 5: movl L_MD_REGS(%edi),%ecx
1113: pushl TF_EIP(%ecx)
1.20 dsl 1114: pushl %eax
1115: call _C_LABEL(ras_lookup)
1116: addl $8,%esp
1117: cmpl $-1,%eax
1.48 yamt 1118: je 2b
1.49 ad 1119: movl L_MD_REGS(%edi),%ecx
1120: movl %eax,TF_EIP(%ecx)
1.48 yamt 1121: jmp 2b
1.1 fvdl 1122:
1.60 yamt 1123: .Lcopy_iobitmap:
1124: /* Copy I/O bitmap. */
1.86 ad 1125: incl _C_LABEL(pmap_iobmp_evcnt)+EV_COUNT
1.60 yamt 1126: movl $(IOMAPSIZE/4),%ecx
1127: pushl %esi
1128: pushl %edi
1129: movl %eax,%esi /* pcb_iomap */
1130: movl CPUVAR(SELF),%edi
1131: leal CPU_INFO_IOMAP(%edi),%edi
1132: rep
1133: movsl
1134: popl %edi
1135: popl %esi
1136: movl $((CPU_INFO_IOMAP - CPU_INFO_TSS) << 16),CPUVAR(IOBASE)
1137: jmp .Liobitmap_done
1.72 yamt 1138: END(cpu_switchto)
1.60 yamt 1139:
1.1 fvdl 1140: /*
1141: * void savectx(struct pcb *pcb);
1.48 yamt 1142: *
1.1 fvdl 1143: * Update pcb, saving current processor state.
1144: */
1145: ENTRY(savectx)
1.115 ! maxv 1146: movl 4(%esp),%edx /* edx = pcb */
1.1 fvdl 1147: movl %esp,PCB_ESP(%edx)
1148: movl %ebp,PCB_EBP(%edx)
1149: ret
1.72 yamt 1150: END(savectx)
1.1 fvdl 1151:
1152: /*
1.48 yamt 1153: * osyscall()
1154: *
1.1 fvdl 1155: * Old call gate entry for syscall
1156: */
1157: IDTVEC(osyscall)
1.87 ad 1158: #ifndef XEN
1159: /* XXX we are in trouble! interrupts be off here. */
1.115 ! maxv 1160: cli /* must be first instruction */
1.87 ad 1161: #endif
1.115 ! maxv 1162: pushfl /* set eflags in trap frame */
1.1 fvdl 1163: popl 8(%esp)
1.115 ! maxv 1164: orl $PSL_I,8(%esp) /* re-enable ints on return to user */
! 1165: pushl $7 /* size of instruction for restart */
1.1 fvdl 1166: jmp syscall1
1.72 yamt 1167: IDTVEC_END(osyscall)
1.1 fvdl 1168:
1169: /*
1.48 yamt 1170: * syscall()
1171: *
1.1 fvdl 1172: * Trap gate entry for syscall
1173: */
1174: IDTVEC(syscall)
1.115 ! maxv 1175: pushl $2 /* size of instruction for restart */
1.1 fvdl 1176: syscall1:
1.115 ! maxv 1177: pushl $T_ASTFLT /* trap # for doing ASTs */
1.1 fvdl 1178: INTRENTRY
1.85 ad 1179: STI(%eax)
1.1 fvdl 1180: #ifdef DIAGNOSTIC
1181: movl CPUVAR(ILEVEL),%ebx
1182: testl %ebx,%ebx
1183: jz 1f
1184: pushl $5f
1.84 ad 1185: call _C_LABEL(panic)
1.1 fvdl 1186: addl $4,%esp
1187: #ifdef DDB
1188: int $3
1189: #endif
1.30 junyoung 1190: 1:
1.1 fvdl 1191: #endif /* DIAGNOSTIC */
1.115 ! maxv 1192: addl $1,CPUVAR(NSYSCALL) /* count it atomically */
! 1193: adcl $0,CPUVAR(NSYSCALL)+4 /* count it atomically */
1.68 ad 1194: movl CPUVAR(CURLWP),%edi
1195: movl L_PROC(%edi),%edx
1.115 ! maxv 1196: movl %esp,L_MD_REGS(%edi) /* save pointer to frame */
1.15 fvdl 1197: pushl %esp
1.115 ! maxv 1198: call *P_MD_SYSCALL(%edx) /* get pointer to syscall() function */
1.15 fvdl 1199: addl $4,%esp
1.27 yamt 1200: .Lsyscall_checkast:
1.24 yamt 1201: /* Check for ASTs on exit to user mode. */
1.62 bouyer 1202: CLI(%eax)
1.68 ad 1203: movl L_MD_ASTPENDING(%edi), %eax
1204: orl CPUVAR(WANT_PMAPLOAD), %eax
1.24 yamt 1205: jnz 9f
1.62 bouyer 1206: #ifdef XEN
1207: STIC(%eax)
1208: jz 14f
1209: call _C_LABEL(stipending)
1210: testl %eax,%eax
1211: jz 14f
1212: /* process pending interrupts */
1213: CLI(%eax)
1214: movl CPUVAR(ILEVEL), %ebx
1.115 ! maxv 1215: movl $.Lsyscall_resume, %esi /* address to resume loop at */
1.62 bouyer 1216: .Lsyscall_resume:
1.115 ! maxv 1217: movl %ebx,%eax /* get cpl */
1.62 bouyer 1218: movl CPUVAR(IUNMASK)(,%eax,4),%eax
1.115 ! maxv 1219: andl CPUVAR(IPENDING),%eax /* any non-masked bits left? */
1.62 bouyer 1220: jz 17f
1221: bsrl %eax,%eax
1222: btrl %eax,CPUVAR(IPENDING)
1223: movl CPUVAR(ISOURCES)(,%eax,4),%eax
1224: jmp *IS_RESUME(%eax)
1.115 ! maxv 1225: 17: movl %ebx, CPUVAR(ILEVEL) /* restore cpl */
1.62 bouyer 1226: jmp .Lsyscall_checkast
1227: 14:
1228: #endif /* XEN */
1.1 fvdl 1229: #ifndef DIAGNOSTIC
1.24 yamt 1230: INTRFASTEXIT
1.1 fvdl 1231: #else /* DIAGNOSTIC */
1.24 yamt 1232: cmpl $IPL_NONE,CPUVAR(ILEVEL)
1.1 fvdl 1233: jne 3f
1234: INTRFASTEXIT
1.62 bouyer 1235: 3: STI(%eax)
1.1 fvdl 1236: pushl $4f
1.84 ad 1237: call _C_LABEL(panic)
1.1 fvdl 1238: addl $4,%esp
1.58 ad 1239: pushl $IPL_NONE
1240: call _C_LABEL(spllower)
1241: addl $4,%esp
1.53 yamt 1242: jmp .Lsyscall_checkast
1.84 ad 1243: 4: .asciz "SPL NOT LOWERED ON SYSCALL EXIT\n"
1244: 5: .asciz "SPL NOT ZERO ON SYSCALL ENTRY\n"
1.1 fvdl 1245: #endif /* DIAGNOSTIC */
1.68 ad 1246: 9:
1247: cmpl $0, CPUVAR(WANT_PMAPLOAD)
1248: jz 10f
1249: STI(%eax)
1.24 yamt 1250: call _C_LABEL(pmap_load)
1.27 yamt 1251: jmp .Lsyscall_checkast /* re-check ASTs */
1.68 ad 1252: 10:
1253: /* Always returning to user mode here. */
1254: movl $0, L_MD_ASTPENDING(%edi)
1255: STI(%eax)
1256: /* Pushed T_ASTFLT into tf_trapno on entry. */
1257: pushl %esp
1258: call _C_LABEL(trap)
1259: addl $4,%esp
1260: jmp .Lsyscall_checkast /* re-check ASTs */
1.72 yamt 1261: IDTVEC_END(syscall)
1.1 fvdl 1262:
1.81 ad 1263: IDTVEC(svr4_fasttrap)
1.115 ! maxv 1264: pushl $2 /* size of instruction for restart */
! 1265: pushl $T_ASTFLT /* trap # for doing ASTs */
1.81 ad 1266: INTRENTRY
1.85 ad 1267: STI(%eax)
1.81 ad 1268: pushl $RW_READER
1269: pushl $_C_LABEL(svr4_fasttrap_lock)
1270: call _C_LABEL(rw_enter)
1271: addl $8,%esp
1272: call *_C_LABEL(svr4_fasttrap_vec)
1273: pushl $_C_LABEL(svr4_fasttrap_lock)
1274: call _C_LABEL(rw_exit)
1275: addl $4,%esp
1276: 2: /* Check for ASTs on exit to user mode. */
1277: cli
1.115 ! maxv 1278: CHECK_ASTPENDING(%eax)
1.81 ad 1279: je 1f
1280: /* Always returning to user mode here. */
1281: CLEAR_ASTPENDING(%eax)
1282: sti
1283: /* Pushed T_ASTFLT into tf_trapno on entry. */
1284: pushl %esp
1285: call _C_LABEL(trap)
1286: addl $4,%esp
1287: jmp 2b
1288: 1: CHECK_DEFERRED_SWITCH
1289: jnz 9f
1290: INTRFASTEXIT
1291: 9: sti
1292: call _C_LABEL(pmap_load)
1293: cli
1294: jmp 2b
1295:
1.48 yamt 1296: /*
1297: * int npx586bug1(int a, int b)
1.110 dsl 1298: * Used when checking for the FDIV bug on first generations pentiums.
1299: * Anything 120MHz or above is fine.
1.48 yamt 1300: */
1.1 fvdl 1301: NENTRY(npx586bug1)
1.115 ! maxv 1302: fildl 4(%esp) /* x */
! 1303: fildl 8(%esp) /* y */
1.1 fvdl 1304: fld %st(1)
1.115 ! maxv 1305: fdiv %st(1),%st /* x/y */
! 1306: fmulp %st,%st(1) /* (x/y)*y */
! 1307: fsubrp %st,%st(1) /* x-(x/y)*y */
1.1 fvdl 1308: pushl $0
1309: fistpl (%esp)
1310: popl %eax
1311: ret
1.72 yamt 1312: END(npx586bug1)
1.50 ad 1313:
1314: /*
1.76 ad 1315: * void sse2_idlezero_page(void *pg)
1.50 ad 1316: *
1.76 ad 1317: * Zero a page without polluting the cache. Preemption must be
1318: * disabled by the caller. Abort if a preemption is pending.
1.50 ad 1319: */
1.76 ad 1320: ENTRY(sse2_idlezero_page)
1.50 ad 1321: pushl %ebp
1322: movl %esp,%ebp
1323: movl 8(%esp), %edx
1.76 ad 1324: movl $(PAGE_SIZE/32), %ecx
1.50 ad 1325: xorl %eax, %eax
1326: .align 16
1327: 1:
1.82 ad 1328: testl $RESCHED_KPREEMPT, CPUVAR(RESCHED)
1.76 ad 1329: jnz 2f
1.50 ad 1330: movnti %eax, 0(%edx)
1331: movnti %eax, 4(%edx)
1332: movnti %eax, 8(%edx)
1333: movnti %eax, 12(%edx)
1334: movnti %eax, 16(%edx)
1335: movnti %eax, 20(%edx)
1336: movnti %eax, 24(%edx)
1337: movnti %eax, 28(%edx)
1.76 ad 1338: addl $32, %edx
1.75 ad 1339: decl %ecx
1.50 ad 1340: jnz 1b
1341: sfence
1.76 ad 1342: incl %eax
1.50 ad 1343: pop %ebp
1344: ret
1.76 ad 1345: 2:
1.50 ad 1346: sfence
1347: popl %ebp
1348: ret
1.76 ad 1349: END(sse2_idlezero_page)
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