Annotation of src/sys/arch/i386/i386/locore.S, Revision 1.67.4.2
1.67.4.2! yamt 1: /* $NetBSD: locore.S,v 1.67.4.1 2008/05/16 02:22:34 yamt 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: * 3. All advertising materials mentioning features or use of this software
19: * must display the following acknowledgement:
20: * This product includes software developed by Manuel Bouyer.
21: * 4. The name of the author may not be used to endorse or promote products
22: * derived from this software without specific prior written permission.
23: *
24: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
25: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
26: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
27: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
28: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
29: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
30: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
31: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
32: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
33: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34: *
35: */
36:
37: /*
1.53 yamt 38: * Copyright (c) 2001 Wasabi Systems, Inc.
39: * All rights reserved.
40: *
41: * Written by Frank van der Linden for Wasabi Systems, Inc.
42: *
43: * Redistribution and use in source and binary forms, with or without
44: * modification, are permitted provided that the following conditions
45: * are met:
46: * 1. Redistributions of source code must retain the above copyright
47: * notice, this list of conditions and the following disclaimer.
48: * 2. Redistributions in binary form must reproduce the above copyright
49: * notice, this list of conditions and the following disclaimer in the
50: * documentation and/or other materials provided with the distribution.
51: * 3. All advertising materials mentioning features or use of this software
52: * must display the following acknowledgement:
53: * This product includes software developed for the NetBSD Project by
54: * Wasabi Systems, Inc.
55: * 4. The name of Wasabi Systems, Inc. may not be used to endorse
56: * or promote products derived from this software without specific prior
57: * written permission.
58: *
59: * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
60: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
61: * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
62: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
63: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
64: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
65: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
66: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
67: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
68: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
69: * POSSIBILITY OF SUCH DAMAGE.
70: */
71:
1.1 fvdl 72:
73: /*-
1.67.4.2! yamt 74: * Copyright (c) 1998, 2000, 2004, 2006, 2007, 2009 The NetBSD Foundation, Inc.
1.1 fvdl 75: * All rights reserved.
76: *
77: * This code is derived from software contributed to The NetBSD Foundation
1.67.4.2! yamt 78: * by Charles M. Hannum, and by Andrew Doran.
1.1 fvdl 79: *
80: * Redistribution and use in source and binary forms, with or without
81: * modification, are permitted provided that the following conditions
82: * are met:
83: * 1. Redistributions of source code must retain the above copyright
84: * notice, this list of conditions and the following disclaimer.
85: * 2. Redistributions in binary form must reproduce the above copyright
86: * notice, this list of conditions and the following disclaimer in the
87: * documentation and/or other materials provided with the distribution.
88: *
89: * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
90: * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
91: * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
92: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
93: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
94: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
95: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
96: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
97: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
98: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
99: * POSSIBILITY OF SUCH DAMAGE.
100: */
101:
102: /*-
103: * Copyright (c) 1990 The Regents of the University of California.
104: * All rights reserved.
105: *
106: * This code is derived from software contributed to Berkeley by
107: * William Jolitz.
108: *
109: * Redistribution and use in source and binary forms, with or without
110: * modification, are permitted provided that the following conditions
111: * are met:
112: * 1. Redistributions of source code must retain the above copyright
113: * notice, this list of conditions and the following disclaimer.
114: * 2. Redistributions in binary form must reproduce the above copyright
115: * notice, this list of conditions and the following disclaimer in the
116: * documentation and/or other materials provided with the distribution.
1.12 agc 117: * 3. Neither the name of the University nor the names of its contributors
1.1 fvdl 118: * may be used to endorse or promote products derived from this software
119: * without specific prior written permission.
120: *
121: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
122: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
123: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
124: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
125: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
126: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
127: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
128: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
129: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
130: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
131: * SUCH DAMAGE.
132: *
133: * @(#)locore.s 7.3 (Berkeley) 5/13/91
134: */
135:
1.59 lukem 136: #include <machine/asm.h>
1.67.4.2! yamt 137: __KERNEL_RCSID(0, "$NetBSD: locore.S,v 1.67.4.1 2008/05/16 02:22:34 yamt Exp $");
1.59 lukem 138:
1.18 christos 139: #include "opt_compat_oldboot.h"
1.1 fvdl 140: #include "opt_ddb.h"
1.67.4.2! yamt 141: #include "opt_modular.h"
! 142: #include "opt_multiboot.h"
1.1 fvdl 143: #include "opt_realmem.h"
1.18 christos 144: #include "opt_vm86.h"
1.62 bouyer 145: #include "opt_xen.h"
1.1 fvdl 146:
147: #include "npx.h"
148: #include "assym.h"
149: #include "lapic.h"
150: #include "ioapic.h"
1.8 fvdl 151: #include "ksyms.h"
1.1 fvdl 152:
153: #include <sys/errno.h>
154: #include <sys/syscall.h>
155:
156: #include <machine/cputypes.h>
157: #include <machine/segments.h>
158: #include <machine/specialreg.h>
159: #include <machine/trap.h>
160: #include <machine/i82489reg.h>
1.48 yamt 161: #include <machine/frameasm.h>
162: #include <machine/i82489reg.h>
1.62 bouyer 163: #ifndef XEN
164: #include <machine/multiboot.h>
165: #endif
1.1 fvdl 166:
167: /* XXX temporary kluge; these should not be here */
168: /* Get definitions for IOM_BEGIN, IOM_END, and IOM_SIZE */
169: #include <dev/isa/isareg.h>
170:
1.62 bouyer 171: #ifdef XEN
172: /*
173: * Xen guest identifier and loader selection
174: */
175: .section __xen_guest
176: #ifdef XEN3
177: .ascii "GUEST_OS=netbsd,GUEST_VER=3.0,XEN_VER=xen-3.0"
178: #if defined(DOM0OPS) || !defined(XEN_COMPAT_030001)
179: .ascii ",VIRT_BASE=0xc0000000" /* KERNBASE */
180: .ascii ",ELF_PADDR_OFFSET=0xc0000000" /* KERNBASE */
181: #else
182: .ascii ",VIRT_BASE=0xc0100000" /* KERNTEXTOFF */
183: .ascii ",ELF_PADDR_OFFSET=0xc0100000" /* KERNTEXTOFF */
184: #endif
185: .ascii ",VIRT_ENTRY=0xc0100000" /* KERNTEXTOFF */
186: #if !defined(XEN_COMPAT_030001)
187: .ascii ",HYPERCALL_PAGE=0x00000101"
188: /* (???+HYPERCALL_PAGE_OFFSET)/PAGE_SIZE) */
189: #endif
1.66 bouyer 190: #ifdef PAE
191: .ascii ",PAE=yes[extended-cr3]"
192: #endif
1.62 bouyer 193: #else /* !XEN3 */
194: .ascii "GUEST_OS=netbsd,GUEST_VER=2.0,XEN_VER=2.0"
195: #endif /* XEN3 */
196: .ascii ",LOADER=generic"
1.67.4.2! yamt 197: #if (NKSYMS || defined(DDB) || defined(MODULAR)) && !defined(SYMTAB_SPACE)
1.62 bouyer 198: .ascii ",BSD_SYMTAB=yes"
199: #endif
200: .byte 0
201: #endif
202:
1.1 fvdl 203: /*
204: * Initialization
205: */
206: .data
207:
208: .globl _C_LABEL(cpu)
1.67.4.1 yamt 209: .globl _C_LABEL(cpuid_level)
1.38 jmmv 210: .globl _C_LABEL(esym)
1.67.4.1 yamt 211: .globl _C_LABEL(eblob)
1.38 jmmv 212: .globl _C_LABEL(atdevbase)
1.40 yamt 213: .globl _C_LABEL(proc0uarea),_C_LABEL(PDPpaddr)
1.1 fvdl 214: .globl _C_LABEL(gdt)
215: .globl _C_LABEL(idt)
1.30 junyoung 216: .globl _C_LABEL(lapic_tpr)
217:
1.1 fvdl 218: #if NLAPIC > 0
219: #ifdef __ELF__
1.7 thorpej 220: .align PAGE_SIZE
1.1 fvdl 221: #else
222: .align 12
223: #endif
224: .globl _C_LABEL(local_apic), _C_LABEL(lapic_id)
225: _C_LABEL(local_apic):
226: .space LAPIC_ID
1.30 junyoung 227: _C_LABEL(lapic_id):
1.1 fvdl 228: .long 0x00000000
229: .space LAPIC_TPRI-(LAPIC_ID+4)
1.30 junyoung 230: _C_LABEL(lapic_tpr):
1.1 fvdl 231: .space LAPIC_PPRI-LAPIC_TPRI
1.30 junyoung 232: _C_LABEL(lapic_ppr):
1.1 fvdl 233: .space LAPIC_ISR-LAPIC_PPRI
234: _C_LABEL(lapic_isr):
1.7 thorpej 235: .space PAGE_SIZE-LAPIC_ISR
1.1 fvdl 236: #else
1.30 junyoung 237: _C_LABEL(lapic_tpr):
1.1 fvdl 238: .long 0
239: #endif
1.30 junyoung 240:
1.48 yamt 241: _C_LABEL(cpu): .long 0 # are we 80486, Pentium, or..
1.67.4.1 yamt 242: _C_LABEL(cpuid_level): .long 0
1.1 fvdl 243: _C_LABEL(atdevbase): .long 0 # location of start of iomem in virtual
1.40 yamt 244: _C_LABEL(proc0uarea): .long 0
1.31 junyoung 245: _C_LABEL(PDPpaddr): .long 0 # paddr of PDP, for libkvm
1.53 yamt 246: _C_LABEL(tablesize): .long 0
1.30 junyoung 247:
1.63 bouyer 248: .space 512
1.1 fvdl 249: tmpstk:
250:
1.62 bouyer 251: #ifndef XEN
1.35 yamt 252: #define _RELOC(x) ((x) - KERNBASE)
1.62 bouyer 253: #else
254: #define _RELOC(x) ((x))
255: #endif /* XEN */
1.1 fvdl 256: #define RELOC(x) _RELOC(_C_LABEL(x))
257:
258: .text
259: .globl _C_LABEL(kernel_text)
260: .set _C_LABEL(kernel_text),KERNTEXTOFF
261:
262: .globl start
1.62 bouyer 263: #ifndef XEN
1.1 fvdl 264: start: movw $0x1234,0x472 # warm boot
265:
1.37 jmmv 266: #if defined(MULTIBOOT)
267: jmp 1f
268:
269: .align 4
270: .globl Multiboot_Header
271: _C_LABEL(Multiboot_Header):
1.44 jmmv 272: #define MULTIBOOT_HEADER_FLAGS (MULTIBOOT_HEADER_WANT_MEMORY)
1.37 jmmv 273: .long MULTIBOOT_HEADER_MAGIC
274: .long MULTIBOOT_HEADER_FLAGS
275: .long -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS)
276:
277: 1:
278: /* Check if we are being executed by a Multiboot-compliant boot
279: * loader. */
280: cmpl $MULTIBOOT_INFO_MAGIC,%eax
281: jne 1f
282:
1.43 mrg 283: /*
284: * Indeed, a multiboot-compliant boot loader executed us. We copy
1.37 jmmv 285: * the received Multiboot information structure into kernel's data
286: * space to process it later -- after we are relocated. It will
1.43 mrg 287: * be safer to run complex C code than doing it at this point.
288: */
1.37 jmmv 289: pushl %ebx # Address of Multiboot information
290: call _C_LABEL(multiboot_pre_reloc)
291: addl $4,%esp
1.38 jmmv 292: jmp 2f
1.37 jmmv 293: #endif
294:
295: 1:
1.1 fvdl 296: /*
1.38 jmmv 297: * At this point, we know that a NetBSD-specific boot loader
298: * booted this kernel. The stack carries the following parameters:
1.41 jmmv 299: * (boothowto, [bootdev], bootinfo, esym, biosextmem, biosbasemem),
1.38 jmmv 300: * 4 bytes each.
1.1 fvdl 301: */
1.38 jmmv 302: addl $4,%esp # Discard return address to boot loader
303: call _C_LABEL(native_loader)
304: addl $24,%esp
1.1 fvdl 305:
306: 2:
307: /* First, reset the PSL. */
308: pushl $PSL_MBO
309: popfl
310:
311: /* Clear segment registers; always null in proc0. */
312: xorl %eax,%eax
313: movw %ax,%fs
314: movw %ax,%gs
315: decl %eax
1.67.4.1 yamt 316: movl %eax,RELOC(cpuid_level)
1.1 fvdl 317:
318: /* Find out our CPU type. */
319:
320: try386: /* Try to toggle alignment check flag; does not exist on 386. */
321: pushfl
322: popl %eax
323: movl %eax,%ecx
324: orl $PSL_AC,%eax
325: pushl %eax
326: popfl
327: pushfl
328: popl %eax
329: xorl %ecx,%eax
330: andl $PSL_AC,%eax
331: pushl %ecx
332: popfl
333:
334: testl %eax,%eax
335: jnz try486
336:
337: /*
338: * Try the test of a NexGen CPU -- ZF will not change on a DIV
339: * instruction on a NexGen, it will on an i386. Documented in
340: * Nx586 Processor Recognition Application Note, NexGen, Inc.
341: */
342: movl $0x5555,%eax
343: xorl %edx,%edx
344: movl $2,%ecx
345: divl %ecx
346: jnz is386
347:
348: isnx586:
349: /*
350: * Don't try cpuid, as Nx586s reportedly don't support the
351: * PSL_ID bit.
352: */
353: movl $CPU_NX586,RELOC(cpu)
354: jmp 2f
355:
356: is386:
357: movl $CPU_386,RELOC(cpu)
358: jmp 2f
359:
360: try486: /* Try to toggle identification flag; does not exist on early 486s. */
361: pushfl
362: popl %eax
363: movl %eax,%ecx
364: xorl $PSL_ID,%eax
365: pushl %eax
366: popfl
367: pushfl
368: popl %eax
369: xorl %ecx,%eax
370: andl $PSL_ID,%eax
371: pushl %ecx
372: popfl
373:
374: testl %eax,%eax
375: jnz try586
376: is486: movl $CPU_486,RELOC(cpu)
377: /*
378: * Check Cyrix CPU
379: * Cyrix CPUs do not change the undefined flags following
380: * execution of the divide instruction which divides 5 by 2.
381: *
382: * Note: CPUID is enabled on M2, so it passes another way.
383: */
384: pushfl
385: movl $0x5555, %eax
386: xorl %edx, %edx
387: movl $2, %ecx
388: clc
389: divl %ecx
390: jnc trycyrix486
391: popfl
392: jmp 2f
393: trycyrix486:
394: movl $CPU_6x86,RELOC(cpu) # set CPU type
395: /*
396: * Check for Cyrix 486 CPU by seeing if the flags change during a
397: * divide. This is documented in the Cx486SLC/e SMM Programmer's
398: * Guide.
399: */
400: xorl %edx,%edx
401: cmpl %edx,%edx # set flags to known state
402: pushfl
403: popl %ecx # store flags in ecx
404: movl $-1,%eax
405: movl $4,%ebx
406: divl %ebx # do a long division
407: pushfl
408: popl %eax
409: xorl %ecx,%eax # are the flags different?
410: testl $0x8d5,%eax # only check C|PF|AF|Z|N|V
411: jne 2f # yes; must be Cyrix 6x86 CPU
412: movl $CPU_486DLC,RELOC(cpu) # set CPU type
413:
414: #ifndef CYRIX_CACHE_WORKS
415: /* Disable caching of the ISA hole only. */
416: invd
417: movb $CCR0,%al # Configuration Register index (CCR0)
418: outb %al,$0x22
419: inb $0x23,%al
420: orb $(CCR0_NC1|CCR0_BARB),%al
421: movb %al,%ah
422: movb $CCR0,%al
423: outb %al,$0x22
424: movb %ah,%al
425: outb %al,$0x23
426: invd
427: #else /* CYRIX_CACHE_WORKS */
428: /* Set cache parameters */
429: invd # Start with guaranteed clean cache
430: movb $CCR0,%al # Configuration Register index (CCR0)
431: outb %al,$0x22
432: inb $0x23,%al
433: andb $~CCR0_NC0,%al
434: #ifndef CYRIX_CACHE_REALLY_WORKS
435: orb $(CCR0_NC1|CCR0_BARB),%al
436: #else
437: orb $CCR0_NC1,%al
438: #endif
439: movb %al,%ah
440: movb $CCR0,%al
441: outb %al,$0x22
442: movb %ah,%al
443: outb %al,$0x23
444: /* clear non-cacheable region 1 */
445: movb $(NCR1+2),%al
446: outb %al,$0x22
447: movb $NCR_SIZE_0K,%al
448: outb %al,$0x23
449: /* clear non-cacheable region 2 */
450: movb $(NCR2+2),%al
451: outb %al,$0x22
452: movb $NCR_SIZE_0K,%al
453: outb %al,$0x23
454: /* clear non-cacheable region 3 */
455: movb $(NCR3+2),%al
456: outb %al,$0x22
457: movb $NCR_SIZE_0K,%al
458: outb %al,$0x23
459: /* clear non-cacheable region 4 */
460: movb $(NCR4+2),%al
461: outb %al,$0x22
462: movb $NCR_SIZE_0K,%al
463: outb %al,$0x23
464: /* enable caching in CR0 */
465: movl %cr0,%eax
466: andl $~(CR0_CD|CR0_NW),%eax
467: movl %eax,%cr0
468: invd
469: #endif /* CYRIX_CACHE_WORKS */
470:
471: jmp 2f
472:
473: try586: /* Use the `cpuid' instruction. */
474: xorl %eax,%eax
475: cpuid
1.67.4.1 yamt 476: movl %eax,RELOC(cpuid_level)
1.1 fvdl 477:
478: 2:
479: /*
480: * Finished with old stack; load new %esp now instead of later so we
481: * can trace this code without having to worry about the trace trap
482: * clobbering the memory test or the zeroing of the bss+bootstrap page
483: * tables.
484: *
485: * The boot program should check:
486: * text+data <= &stack_variable - more_space_for_stack
487: * text+data+bss+pad+space_for_page_tables <= end_of_memory
488: * Oops, the gdt is in the carcass of the boot program so clearing
489: * the rest of memory is still not possible.
490: */
491: movl $_RELOC(tmpstk),%esp # bootstrap stack end location
492:
493: /*
494: * Virtual address space of kernel:
495: *
1.67.4.1 yamt 496: * text | data | bss | [syms] | [blobs] | page dir | proc0 kstack | L1 ptp
497: * 0 1 2 3
1.1 fvdl 498: */
1.53 yamt 499:
500: #define PROC0_PDIR_OFF 0
501: #define PROC0_STK_OFF (PROC0_PDIR_OFF + PAGE_SIZE)
502: #define PROC0_PTP1_OFF (PROC0_STK_OFF + UPAGES * PAGE_SIZE)
503:
504: /*
505: * fillkpt
506: * eax = pte (page frame | control | status)
507: * ebx = page table address
508: * ecx = number of pages to map
509: */
510:
511: #define fillkpt \
512: 1: movl %eax,(%ebx) ; /* store phys addr */ \
513: addl $4,%ebx ; /* next pte/pde */ \
514: addl $PAGE_SIZE,%eax ; /* next phys page */ \
515: loop 1b ; \
516:
1.1 fvdl 517:
518: /* Find end of kernel image. */
519: movl $RELOC(end),%edi
1.67.4.1 yamt 520:
1.67.4.2! yamt 521: #if (NKSYMS || defined(DDB) || defined(MODULAR)) && !defined(SYMTAB_SPACE)
1.1 fvdl 522: /* Save the symbols (if loaded). */
523: movl RELOC(esym),%eax
524: testl %eax,%eax
525: jz 1f
1.35 yamt 526: subl $KERNBASE,%eax
1.1 fvdl 527: movl %eax,%edi
528: 1:
529: #endif
530:
1.67.4.1 yamt 531: /* Skip over any modules/blobs. */
532: movl RELOC(eblob),%eax
533: testl %eax,%eax
534: jz 1f
535: subl $KERNBASE,%eax
536: movl %eax,%edi
537: 1:
1.53 yamt 538: /* Compute sizes */
1.67.4.1 yamt 539: movl %edi,%esi
1.1 fvdl 540: addl $PGOFSET,%esi # page align up
541: andl $~PGOFSET,%esi
542:
1.53 yamt 543: /* nkptp[1] = (esi + ~L2_FRAME) >> L2_SHIFT + 1; */
544: movl %esi,%eax
545: addl $~L2_FRAME,%eax
546: shrl $L2_SHIFT,%eax
547: incl %eax /* one more ptp for VAs stolen by bootstrap */
548: 1: movl %eax,RELOC(nkptp)+1*4
549:
550: /* tablesize = (1 + UPAGES + nkptp) << PGSHIFT; */
551: addl $(1+UPAGES),%eax
552: shll $PGSHIFT,%eax
553: movl %eax,RELOC(tablesize)
554:
555: /* ensure that nkptp covers bootstrap tables */
556: addl %esi,%eax
557: addl $~L2_FRAME,%eax
558: shrl $L2_SHIFT,%eax
559: incl %eax
560: cmpl %eax,RELOC(nkptp)+1*4
561: jnz 1b
562:
563: /* Clear tables */
564: movl %esi,%edi
1.1 fvdl 565: xorl %eax,%eax
566: cld
1.53 yamt 567: movl RELOC(tablesize),%ecx
568: shrl $2,%ecx
1.1 fvdl 569: rep
570: stosl
571:
1.53 yamt 572: leal (PROC0_PTP1_OFF)(%esi), %ebx
1.1 fvdl 573:
574: /*
575: * Build initial page tables.
576: */
1.53 yamt 577: /*
578: * Compute &__data_start - KERNBASE. This can't be > 4G,
579: * or we can't deal with it anyway, since we can't load it in
580: * 32 bit mode. So use the bottom 32 bits.
581: */
582: movl $RELOC(__data_start),%edx
1.1 fvdl 583: andl $~PGOFSET,%edx
1.30 junyoung 584:
1.53 yamt 585: /*
586: * Skip the first MB.
587: */
1.1 fvdl 588: movl $_RELOC(KERNTEXTOFF),%eax
589: movl %eax,%ecx
1.53 yamt 590: shrl $(PGSHIFT-2),%ecx /* ((n >> PGSHIFT) << 2) for # pdes */
591: addl %ecx,%ebx
1.1 fvdl 592:
593: /* Map the kernel text read-only. */
594: movl %edx,%ecx
595: subl %eax,%ecx
596: shrl $PGSHIFT,%ecx
597: orl $(PG_V|PG_KR),%eax
598: fillkpt
599:
600: /* Map the data, BSS, and bootstrap tables read-write. */
601: leal (PG_V|PG_KW)(%edx),%eax
1.53 yamt 602: movl RELOC(tablesize),%ecx
1.1 fvdl 603: addl %esi,%ecx # end of tables
604: subl %edx,%ecx # subtract end of text
605: shrl $PGSHIFT,%ecx
606: fillkpt
607:
1.53 yamt 608: /* Map ISA I/O mem (later atdevbase) */
1.1 fvdl 609: movl $(IOM_BEGIN|PG_V|PG_KW/*|PG_N*/),%eax # having these bits set
610: movl $(IOM_SIZE>>PGSHIFT),%ecx # for this many pte s,
611: fillkpt
612:
613: /*
614: * Construct a page table directory.
615: */
1.53 yamt 616: /* Set up top level entries for identity mapping */
617: leal (PROC0_PDIR_OFF)(%esi),%ebx
618: leal (PROC0_PTP1_OFF)(%esi),%eax
619: orl $(PG_V|PG_KW), %eax
620: movl RELOC(nkptp)+1*4,%ecx
1.1 fvdl 621: fillkpt
622:
1.53 yamt 623: /* Set up top level entries for actual kernel mapping */
624: leal (PROC0_PDIR_OFF + L2_SLOT_KERNBASE*4)(%esi),%ebx
625: leal (PROC0_PTP1_OFF)(%esi),%eax
626: orl $(PG_V|PG_KW), %eax
627: movl RELOC(nkptp)+1*4,%ecx
1.1 fvdl 628: fillkpt
629:
630: /* Install a PDE recursively mapping page directory as a page table! */
1.53 yamt 631: leal (PROC0_PDIR_OFF + PDIR_SLOT_PTE*4)(%esi),%ebx
632: leal (PROC0_PDIR_OFF)(%esi),%eax
633: orl $(PG_V|PG_KW),%eax
634: movl %eax,(%ebx)
635:
1.1 fvdl 636:
1.31 junyoung 637: /* Save phys. addr of PDP, for libkvm. */
638: movl %esi,RELOC(PDPpaddr)
1.1 fvdl 639:
1.53 yamt 640: /*
641: * Startup checklist:
642: * 1. Load %cr3 with pointer to PDIR.
643: */
1.1 fvdl 644: movl %esi,%eax # phys address of ptd in proc 0
645: movl %eax,%cr3 # load ptd addr into mmu
1.53 yamt 646:
647: /*
648: * 2. Enable paging and the rest of it.
649: */
1.1 fvdl 650: movl %cr0,%eax # get control word
651: # enable paging & NPX emulation
652: orl $(CR0_PE|CR0_PG|CR0_NE|CR0_TS|CR0_EM|CR0_MP),%eax
1.67.4.2! yamt 653: movl %eax,%cr0 # and page NOW!
1.1 fvdl 654:
655: pushl $begin # jump to high mem
656: ret
657:
658: begin:
1.53 yamt 659: /*
660: * We have arrived.
661: * There's no need anymore for the identity mapping in low
662: * memory, remove it.
663: */
664: movl _C_LABEL(nkptp)+1*4,%ecx
665: leal (PROC0_PDIR_OFF)(%esi),%ebx # old, phys address of PDIR
666: addl $(KERNBASE), %ebx # new, virtual address of PDIR
1.1 fvdl 667: 1: movl $0,(%ebx)
1.53 yamt 668: addl $4,%ebx
1.1 fvdl 669: loop 1b
670:
671: /* Relocate atdevbase. */
1.53 yamt 672: movl $KERNBASE,%edx
673: addl _C_LABEL(tablesize),%edx
1.1 fvdl 674: addl %esi,%edx
675: movl %edx,_C_LABEL(atdevbase)
676:
677: /* Set up bootstrap stack. */
1.53 yamt 678: leal (PROC0_STK_OFF+KERNBASE)(%esi),%eax
1.40 yamt 679: movl %eax,_C_LABEL(proc0uarea)
680: leal (KSTACK_SIZE-FRAMESIZE)(%eax),%esp
681: movl %esi,(KSTACK_SIZE+PCB_CR3)(%eax) # pcb->pcb_cr3
1.1 fvdl 682: xorl %ebp,%ebp # mark end of frames
683:
1.37 jmmv 684: #if defined(MULTIBOOT)
685: /* It is now safe to parse the Multiboot information structure
686: * we saved before from C code. Note that we cannot delay its
687: * parsing any more because initgdt (called below) needs to make
688: * use of this information. */
689: call _C_LABEL(multiboot_post_reloc)
690: #endif
691:
1.1 fvdl 692: subl $NGDT*8, %esp # space for temporary gdt
693: pushl %esp
694: call _C_LABEL(initgdt)
695: addl $4,%esp
1.30 junyoung 696:
1.53 yamt 697: movl _C_LABEL(tablesize),%eax
1.1 fvdl 698: addl %esi,%eax # skip past stack and page tables
699:
700: pushl %eax
701: call _C_LABEL(init386) # wire 386 chip for unix operation
702: addl $4+NGDT*8,%esp # pop temporary gdt
703:
704: #ifdef SAFARI_FIFO_HACK
705: movb $5,%al
706: movw $0x37b,%dx
707: outb %al,%dx
708: movw $0x37f,%dx
709: inb %dx,%al
710: movb %al,%cl
711:
712: orb $1,%cl
713:
714: movb $5,%al
715: movw $0x37b,%dx
716: outb %al,%dx
717: movw $0x37f,%dx
718: movb %cl,%al
719: outb %al,%dx
720: #endif /* SAFARI_FIFO_HACK */
721:
722: call _C_LABEL(main)
1.62 bouyer 723: #else /* XEN */
724: start:
725: /* First, reset the PSL. */
726: pushl $PSL_MBO
727: popfl
728:
729: cld
730: #ifdef XEN3
731: movl %esp, %ebx # save start of available space
732: #else
733: movl %esi,%ebx # save start_info pointer
734: #endif
735: movl $_RELOC(tmpstk),%esp # bootstrap stack end location
736:
737: /* Clear BSS first so that there are no surprises... */
738: xorl %eax,%eax
739: movl $RELOC(__bss_start),%edi
740: movl $RELOC(_end),%ecx
741: subl %edi,%ecx
742: rep stosb
743:
744: /* Copy the necessary stuff from start_info structure. */
745: /* We need to copy shared_info early, so that sti/cli work */
746: movl $RELOC(start_info_union),%edi
747: movl $128,%ecx
748: rep movsl
749:
750: /* Clear segment registers; always null in proc0. */
751: xorl %eax,%eax
752: movw %ax,%fs
753: movw %ax,%gs
754: decl %eax
1.67.4.1 yamt 755: movl %eax,RELOC(cpuid_level)
1.62 bouyer 756:
757: xorl %eax,%eax
758: cpuid
1.67.4.1 yamt 759: movl %eax,RELOC(cpuid_level)
1.62 bouyer 760:
761: call xen_pmap_bootstrap
762: /*
763: * First avail returned by xen_pmap_bootstrap in %eax
764: */
765: movl %eax, %esi;
766: movl %esi, _C_LABEL(proc0uarea)
767:
768: #define PROC0PDIR ((0) * PAGE_SIZE)
769: #define PROC0STACK ((1) * PAGE_SIZE)
770:
771: /* Set up bootstrap stack. */
772: leal (KSTACK_SIZE-FRAMESIZE)(%eax),%esp
773: xorl %ebp,%ebp # mark end of frames
774:
775: addl $USPACE, %esi
776: subl $KERNBASE, %esi #init386 want a physical address
777: pushl %esi
778: call _C_LABEL(init386) # wire 386 chip for unix operation
779: addl $4,%esp
780: call _C_LABEL(main)
781:
782: #if defined(XEN3) && !defined(XEN_COMPAT_030001)
783: /* space for the hypercall call page */
784: #define HYPERCALL_PAGE_OFFSET 0x1000
785: .org HYPERCALL_PAGE_OFFSET
786: ENTRY(hypercall_page)
787: .skip 0x1000
788: #endif /* defined(XEN3) && !defined(XEN_COMPAT_030001) */
789:
790: /*
791: * void lgdt_finish(void);
792: * Finish load a new GDT pointer (do any necessary cleanup).
793: * XXX It's somewhat questionable whether reloading all the segment registers
794: * is necessary, since the actual descriptor data is not changed except by
795: * process creation and exit, both of which clean up via task switches. OTOH,
796: * this only happens at run time when the GDT is resized.
797: */
798: /* LINTSTUB: Func: void lgdt_finish(void) */
799: NENTRY(lgdt_finish)
800: movl $GSEL(GDATA_SEL, SEL_KPL),%eax
801: movw %ax,%ds
802: movw %ax,%es
803: movw %ax,%gs
804: movw %ax,%ss
805: movl $GSEL(GCPU_SEL, SEL_KPL),%eax
806: movw %ax,%fs
807: /* Reload code selector by doing intersegment return. */
808: popl %eax
809: pushl $GSEL(GCODE_SEL, SEL_KPL)
810: pushl %eax
811: lret
1.67.4.1 yamt 812: END(lgdt_finish)
1.62 bouyer 813:
814: #endif /* XEN */
1.1 fvdl 815:
816: /*
1.48 yamt 817: * void lwp_trampoline(void);
818: *
1.1 fvdl 819: * This is a trampoline function pushed onto the stack of a newly created
820: * process in order to do some additional setup. The trampoline is entered by
821: * cpu_switch()ing to the process, so we abuse the callee-saved registers used
822: * by cpu_switch() to store the information about the stub to call.
823: * NOTE: This function does not have a normal calling sequence!
824: */
1.48 yamt 825: NENTRY(lwp_trampoline)
1.67.4.1 yamt 826: movl %ebp,%edi /* for .Lsyscall_checkast */
1.48 yamt 827: xorl %ebp,%ebp
1.67.4.1 yamt 828: pushl %edi
1.48 yamt 829: pushl %eax
830: call _C_LABEL(lwp_startup)
831: addl $8,%esp
1.1 fvdl 832: pushl %ebx
833: call *%esi
834: addl $4,%esp
1.67.4.1 yamt 835: jmp .Lsyscall_checkast
1.1 fvdl 836: /* NOTREACHED */
1.67.4.1 yamt 837: END(lwp_trampoline)
1.1 fvdl 838:
839: /*
1.48 yamt 840: * sigcode()
841: *
842: * Signal trampoline; copied to top of user stack. Used only for
843: * compatibility with old releases of NetBSD.
1.1 fvdl 844: */
845: NENTRY(sigcode)
846: /*
847: * Handler has returned here as if we called it. The sigcontext
848: * is on the stack after the 3 args "we" pushed.
849: */
850: leal 12(%esp),%eax # get pointer to sigcontext
851: movl %eax,4(%esp) # put it in the argument slot
852: # fake return address already there
1.17 christos 853: movl $SYS_compat_16___sigreturn14,%eax
1.1 fvdl 854: int $0x80 # enter kernel with args on stack
855: movl $SYS_exit,%eax
856: int $0x80 # exit if sigreturn fails
857: .globl _C_LABEL(esigcode)
858: _C_LABEL(esigcode):
1.67.4.1 yamt 859: END(sigcode)
1.1 fvdl 860:
861: /*
1.48 yamt 862: * int setjmp(label_t *)
863: *
864: * Used primarily by DDB.
1.1 fvdl 865: */
866: ENTRY(setjmp)
867: movl 4(%esp),%eax
868: movl %ebx,(%eax) # save ebx
869: movl %esp,4(%eax) # save esp
870: movl %ebp,8(%eax) # save ebp
871: movl %esi,12(%eax) # save esi
872: movl %edi,16(%eax) # save edi
873: movl (%esp),%edx # get rta
874: movl %edx,20(%eax) # save eip
1.48 yamt 875: xorl %eax,%eax # return 0
1.1 fvdl 876: ret
1.67.4.1 yamt 877: END(setjmp)
1.1 fvdl 878:
1.48 yamt 879: /*
880: * int longjmp(label_t *)
881: *
882: * Used primarily by DDB.
883: */
1.1 fvdl 884: ENTRY(longjmp)
885: movl 4(%esp),%eax
886: movl (%eax),%ebx # restore ebx
887: movl 4(%eax),%esp # restore esp
888: movl 8(%eax),%ebp # restore ebp
889: movl 12(%eax),%esi # restore esi
890: movl 16(%eax),%edi # restore edi
891: movl 20(%eax),%edx # get rta
892: movl %edx,(%esp) # put in return frame
1.48 yamt 893: movl $1,%eax # return 1
1.1 fvdl 894: ret
1.67.4.1 yamt 895: END(longjmp)
1.1 fvdl 896:
1.65 skrll 897: /*
898: * void dumpsys(void)
899: *
900: * Mimic cpu_switchto() for postmortem debugging.
901: */
1.64 skrll 902: ENTRY(dumpsys)
1.65 skrll 903: pushl %ebx # set up fake switchframe
904: pushl %esi # and save context
905: pushl %edi
906: movl %esp,_C_LABEL(dumppcb)+PCB_ESP
907: movl %ebp,_C_LABEL(dumppcb)+PCB_EBP
908: call _C_LABEL(dodumpsys) # dump!
909: addl $(3*4), %esp # unwind switchframe
1.64 skrll 910: ret
1.67.4.1 yamt 911: END(dumpsys)
1.64 skrll 912:
1.1 fvdl 913: /*
1.67.4.2! yamt 914: * struct lwp *cpu_switchto(struct lwp *oldlwp, struct *newlwp,
1.58 ad 915: * bool returning)
1.30 junyoung 916: *
1.48 yamt 917: * 1. if (oldlwp != NULL), save its context.
918: * 2. then, restore context of newlwp.
919: *
920: * Note that the stack frame layout is known to "struct switchframe" in
921: * <machine/frame.h> and to the code in cpu_lwp_fork() which initializes
1.5 thorpej 922: * it for a new lwp.
1.1 fvdl 923: */
1.48 yamt 924: ENTRY(cpu_switchto)
1.1 fvdl 925: pushl %ebx
926: pushl %esi
927: pushl %edi
928:
1.67.4.1 yamt 929: #if defined(DIAGNOSTIC) && !defined(XEN)
930: cmpl $IPL_SCHED,CPUVAR(ILEVEL)
931: jbe 0f
1.67.4.2! yamt 932: pushl CPUVAR(ILEVEL)
1.67.4.1 yamt 933: pushl $.Lstr
934: call _C_LABEL(panic)
1.67.4.2! yamt 935: addl $8,%esp
! 936: .Lstr: .string "cpu_switchto: switching above IPL_SCHED (%d)\0"
1.67.4.1 yamt 937: 0:
938: #endif
939:
1.48 yamt 940: movl 16(%esp),%esi # oldlwp
941: movl 20(%esp),%edi # newlwp
1.58 ad 942: movl 24(%esp),%edx # returning
1.48 yamt 943: testl %esi,%esi
944: jz 1f
1.1 fvdl 945:
1.48 yamt 946: /* Save old context. */
947: movl L_ADDR(%esi),%eax
948: movl %esp,PCB_ESP(%eax)
949: movl %ebp,PCB_EBP(%eax)
950:
951: /* Switch to newlwp's stack. */
952: 1: movl L_ADDR(%edi),%ebx
953: movl PCB_EBP(%ebx),%ebp
954: movl PCB_ESP(%ebx),%esp
1.1 fvdl 955:
1.61 ad 956: /*
957: * Set curlwp. This must be globally visible in order to permit
958: * non-interlocked mutex release.
959: */
960: movl %edi,%ecx
961: xchgl %ecx,CPUVAR(CURLWP)
1.58 ad 962:
963: /* Skip the rest if returning to a pinned LWP. */
964: testl %edx,%edx
965: jnz 4f
966:
1.62 bouyer 967: #ifdef XEN
968: pushl %edi
969: call _C_LABEL(i386_switch_context)
970: addl $4,%esp
971: #else /* XEN */
1.60 yamt 972: /* Switch ring0 esp */
973: movl PCB_ESP0(%ebx),%eax
974: movl %eax,CPUVAR(ESP0)
1.1 fvdl 975:
976: /* Don't bother with the rest if switching to a system process. */
1.48 yamt 977: testl $LW_SYSTEM,L_FLAG(%edi)
978: jnz 4f
1.1 fvdl 979:
1.54 ad 980: /* Restore thread-private %fs/%gs descriptors. */
1.60 yamt 981: movl CPUVAR(GDT),%ecx
1.55 ad 982: movl PCB_FSD(%ebx), %eax
983: movl PCB_FSD+4(%ebx), %edx
1.54 ad 984: movl %eax, (GUFS_SEL*8)(%ecx)
985: movl %edx, (GUFS_SEL*8+4)(%ecx)
1.55 ad 986: movl PCB_GSD(%ebx), %eax
987: movl PCB_GSD+4(%ebx), %edx
1.54 ad 988: movl %eax, (GUGS_SEL*8)(%ecx)
989: movl %edx, (GUGS_SEL*8+4)(%ecx)
1.62 bouyer 990: #endif /* XEN */
1.54 ad 991:
1.60 yamt 992: /* Switch I/O bitmap */
993: movl PCB_IOMAP(%ebx),%eax
994: orl %eax,%eax
995: jnz,pn .Lcopy_iobitmap
996: movl $(IOMAP_INVALOFF << 16),CPUVAR(IOBASE)
997: .Liobitmap_done:
998:
1.56 ad 999: /* Is this process using RAS (restartable atomic sequences)? */
1000: movl L_PROC(%edi),%eax
1001: cmpl $0,P_RASLIST(%eax)
1002: jne 5f
1003:
1.48 yamt 1004: /*
1005: * Restore cr0 (including FPU state). Raise the IPL to IPL_IPI.
1006: * FPU IPIs can alter the LWP's saved cr0. Dropping the priority
1007: * is deferred until mi_switch(), when cpu_switchto() returns.
1008: */
1.62 bouyer 1009: 2:
1010: #ifndef XEN
1011: movl $IPL_IPI,CPUVAR(ILEVEL)
1.67.4.2! yamt 1012: movl PCB_CR0(%ebx),%ecx /* has CR0_TS clear */
1.48 yamt 1013: movl %cr0,%edx
1.1 fvdl 1014:
1.30 junyoung 1015: /*
1.22 wiz 1016: * If our floating point registers are on a different CPU,
1.48 yamt 1017: * set CR0_TS so we'll trap rather than reuse bogus state.
1.1 fvdl 1018: */
1.67.4.2! yamt 1019: cmpl CPUVAR(FPCURLWP),%edi
1.48 yamt 1020: je 3f
1.1 fvdl 1021: orl $CR0_TS,%ecx
1.48 yamt 1022:
1023: /* Reloading CR0 is very expensive - avoid if possible. */
1024: 3: cmpl %edx,%ecx
1025: je 4f
1.1 fvdl 1026: movl %ecx,%cr0
1.62 bouyer 1027: #endif /* XEN */
1.1 fvdl 1028:
1.48 yamt 1029: /* Return to the new LWP, returning 'oldlwp' in %eax. */
1030: 4: movl %esi,%eax
1.1 fvdl 1031: popl %edi
1032: popl %esi
1033: popl %ebx
1034: ret
1.20 dsl 1035:
1.48 yamt 1036: /* Check for restartable atomic sequences (RAS). */
1037: 5: movl L_MD_REGS(%edi),%ecx
1038: pushl TF_EIP(%ecx)
1.20 dsl 1039: pushl %eax
1040: call _C_LABEL(ras_lookup)
1041: addl $8,%esp
1042: cmpl $-1,%eax
1.48 yamt 1043: je 2b
1.49 ad 1044: movl L_MD_REGS(%edi),%ecx
1045: movl %eax,TF_EIP(%ecx)
1.48 yamt 1046: jmp 2b
1.1 fvdl 1047:
1.60 yamt 1048: .Lcopy_iobitmap:
1049: /* Copy I/O bitmap. */
1.67.4.2! yamt 1050: incl _C_LABEL(pmap_iobmp_evcnt)+EV_COUNT
1.60 yamt 1051: movl $(IOMAPSIZE/4),%ecx
1052: pushl %esi
1053: pushl %edi
1054: movl %eax,%esi /* pcb_iomap */
1055: movl CPUVAR(SELF),%edi
1056: leal CPU_INFO_IOMAP(%edi),%edi
1057: rep
1058: movsl
1059: popl %edi
1060: popl %esi
1061: movl $((CPU_INFO_IOMAP - CPU_INFO_TSS) << 16),CPUVAR(IOBASE)
1062: jmp .Liobitmap_done
1.67.4.1 yamt 1063: END(cpu_switchto)
1.60 yamt 1064:
1.1 fvdl 1065: /*
1066: * void savectx(struct pcb *pcb);
1.48 yamt 1067: *
1.1 fvdl 1068: * Update pcb, saving current processor state.
1069: */
1070: ENTRY(savectx)
1.47 skrll 1071: movl 4(%esp),%edx # edx = pcb
1.1 fvdl 1072: movl %esp,PCB_ESP(%edx)
1073: movl %ebp,PCB_EBP(%edx)
1074: ret
1.67.4.1 yamt 1075: END(savectx)
1.1 fvdl 1076:
1077: /*
1.48 yamt 1078: * osyscall()
1079: *
1.1 fvdl 1080: * Old call gate entry for syscall
1081: */
1082: IDTVEC(osyscall)
1.67.4.2! yamt 1083: cli # must be first instruction
1.48 yamt 1084: pushfl # set eflags in trap frame
1.1 fvdl 1085: popl 8(%esp)
1.67.4.2! yamt 1086: orl $PSL_I,(%esp) # re-enable ints on return to user
1.1 fvdl 1087: pushl $7 # size of instruction for restart
1088: jmp syscall1
1.67.4.1 yamt 1089: IDTVEC_END(osyscall)
1.1 fvdl 1090:
1091: /*
1.48 yamt 1092: * syscall()
1093: *
1.1 fvdl 1094: * Trap gate entry for syscall
1095: */
1096: IDTVEC(syscall)
1097: pushl $2 # size of instruction for restart
1098: syscall1:
1099: pushl $T_ASTFLT # trap # for doing ASTs
1100: INTRENTRY
1.67.4.2! yamt 1101: STI(%eax)
1.1 fvdl 1102: #ifdef DIAGNOSTIC
1103: movl CPUVAR(ILEVEL),%ebx
1104: testl %ebx,%ebx
1105: jz 1f
1106: pushl $5f
1.67.4.2! yamt 1107: call _C_LABEL(panic)
1.1 fvdl 1108: addl $4,%esp
1109: #ifdef DDB
1110: int $3
1111: #endif
1.30 junyoung 1112: 1:
1.1 fvdl 1113: #endif /* DIAGNOSTIC */
1.67 ad 1114: incl CPUVAR(NSYSCALL) # count it atomically
1.67.4.1 yamt 1115: movl CPUVAR(CURLWP),%edi
1116: movl L_PROC(%edi),%edx
1117: movl %esp,L_MD_REGS(%edi) # save pointer to frame
1.15 fvdl 1118: pushl %esp
1.1 fvdl 1119: call *P_MD_SYSCALL(%edx) # get pointer to syscall() function
1.15 fvdl 1120: addl $4,%esp
1.27 yamt 1121: .Lsyscall_checkast:
1.24 yamt 1122: /* Check for ASTs on exit to user mode. */
1.62 bouyer 1123: CLI(%eax)
1.67.4.1 yamt 1124: movl L_MD_ASTPENDING(%edi), %eax
1125: orl CPUVAR(WANT_PMAPLOAD), %eax
1.24 yamt 1126: jnz 9f
1.62 bouyer 1127: #ifdef XEN
1128: STIC(%eax)
1129: jz 14f
1130: call _C_LABEL(stipending)
1131: testl %eax,%eax
1132: jz 14f
1133: /* process pending interrupts */
1134: CLI(%eax)
1135: movl CPUVAR(ILEVEL), %ebx
1136: movl $.Lsyscall_resume, %esi # address to resume loop at
1137: .Lsyscall_resume:
1138: movl %ebx,%eax # get cpl
1139: movl CPUVAR(IUNMASK)(,%eax,4),%eax
1140: andl CPUVAR(IPENDING),%eax # any non-masked bits left?
1141: jz 17f
1142: bsrl %eax,%eax
1143: btrl %eax,CPUVAR(IPENDING)
1144: movl CPUVAR(ISOURCES)(,%eax,4),%eax
1145: jmp *IS_RESUME(%eax)
1146: 17: movl %ebx, CPUVAR(ILEVEL) #restore cpl
1147: jmp .Lsyscall_checkast
1148: 14:
1149: #endif /* XEN */
1.1 fvdl 1150: #ifndef DIAGNOSTIC
1.24 yamt 1151: INTRFASTEXIT
1.1 fvdl 1152: #else /* DIAGNOSTIC */
1.24 yamt 1153: cmpl $IPL_NONE,CPUVAR(ILEVEL)
1.1 fvdl 1154: jne 3f
1155: INTRFASTEXIT
1.62 bouyer 1156: 3: STI(%eax)
1.1 fvdl 1157: pushl $4f
1.67.4.2! yamt 1158: call _C_LABEL(panic)
1.1 fvdl 1159: addl $4,%esp
1.58 ad 1160: pushl $IPL_NONE
1161: call _C_LABEL(spllower)
1162: addl $4,%esp
1.53 yamt 1163: jmp .Lsyscall_checkast
1.67.4.2! yamt 1164: 4: .asciz "SPL NOT LOWERED ON SYSCALL EXIT\n"
! 1165: 5: .asciz "SPL NOT ZERO ON SYSCALL ENTRY\n"
1.1 fvdl 1166: #endif /* DIAGNOSTIC */
1.67.4.1 yamt 1167: 9:
1168: cmpl $0, CPUVAR(WANT_PMAPLOAD)
1169: jz 10f
1170: STI(%eax)
1.24 yamt 1171: call _C_LABEL(pmap_load)
1.27 yamt 1172: jmp .Lsyscall_checkast /* re-check ASTs */
1.67.4.1 yamt 1173: 10:
1174: /* Always returning to user mode here. */
1175: movl $0, L_MD_ASTPENDING(%edi)
1176: STI(%eax)
1177: /* Pushed T_ASTFLT into tf_trapno on entry. */
1178: pushl %esp
1179: call _C_LABEL(trap)
1180: addl $4,%esp
1181: jmp .Lsyscall_checkast /* re-check ASTs */
1182: IDTVEC_END(syscall)
1.1 fvdl 1183:
1.67.4.2! yamt 1184: IDTVEC(svr4_fasttrap)
! 1185: pushl $2 # size of instruction for restart
! 1186: pushl $T_ASTFLT # trap # for doing ASTs
! 1187: INTRENTRY
! 1188: STI(%eax)
! 1189: pushl $RW_READER
! 1190: pushl $_C_LABEL(svr4_fasttrap_lock)
! 1191: call _C_LABEL(rw_enter)
! 1192: addl $8,%esp
! 1193: call *_C_LABEL(svr4_fasttrap_vec)
! 1194: pushl $_C_LABEL(svr4_fasttrap_lock)
! 1195: call _C_LABEL(rw_exit)
! 1196: addl $4,%esp
! 1197: 2: /* Check for ASTs on exit to user mode. */
! 1198: cli
! 1199: CHECK_ASTPENDING(%eax)
! 1200: je 1f
! 1201: /* Always returning to user mode here. */
! 1202: CLEAR_ASTPENDING(%eax)
! 1203: sti
! 1204: /* Pushed T_ASTFLT into tf_trapno on entry. */
! 1205: pushl %esp
! 1206: call _C_LABEL(trap)
! 1207: addl $4,%esp
! 1208: jmp 2b
! 1209: 1: CHECK_DEFERRED_SWITCH
! 1210: jnz 9f
! 1211: INTRFASTEXIT
! 1212: 9: sti
! 1213: call _C_LABEL(pmap_load)
! 1214: cli
! 1215: jmp 2b
! 1216:
1.1 fvdl 1217: #if NNPX > 0
1218: /*
1219: * Special interrupt handlers. Someday intr0-intr15 will be used to count
1220: * interrupts. We'll still need a special exception 16 handler. The busy
1221: * latch stuff in probintr() can be moved to npxprobe().
1222: */
1223:
1.48 yamt 1224: /*
1225: * void probeintr(void)
1226: */
1.1 fvdl 1227: NENTRY(probeintr)
1228: ss
1229: incl _C_LABEL(npx_intrs_while_probing)
1230: pushl %eax
1231: movb $0x20,%al # EOI (asm in strings loses cpp features)
1232: outb %al,$0xa0 # IO_ICU2
1233: outb %al,$0x20 # IO_ICU1
1234: movb $0,%al
1235: outb %al,$0xf0 # clear BUSY# latch
1236: popl %eax
1237: iret
1.67.4.1 yamt 1238: END(probeintr)
1.1 fvdl 1239:
1.48 yamt 1240: /*
1241: * void probetrap(void)
1242: */
1.1 fvdl 1243: NENTRY(probetrap)
1244: ss
1245: incl _C_LABEL(npx_traps_while_probing)
1246: fnclex
1247: iret
1.67.4.1 yamt 1248: END(probetrap)
1.1 fvdl 1249:
1.48 yamt 1250: /*
1251: * int npx586bug1(int a, int b)
1252: */
1.1 fvdl 1253: NENTRY(npx586bug1)
1254: fildl 4(%esp) # x
1255: fildl 8(%esp) # y
1256: fld %st(1)
1257: fdiv %st(1),%st # x/y
1258: fmulp %st,%st(1) # (x/y)*y
1259: fsubrp %st,%st(1) # x-(x/y)*y
1260: pushl $0
1261: fistpl (%esp)
1262: popl %eax
1263: ret
1.67.4.1 yamt 1264: END(npx586bug1)
1.1 fvdl 1265: #endif /* NNPX > 0 */
1.50 ad 1266:
1267: /*
1.67.4.2! yamt 1268: * void sse2_idlezero_page(void *pg)
1.50 ad 1269: *
1.67.4.2! yamt 1270: * Zero a page without polluting the cache. Preemption must be
! 1271: * disabled by the caller. Abort if a preemption is pending.
1.50 ad 1272: */
1.67.4.2! yamt 1273: ENTRY(sse2_idlezero_page)
1.50 ad 1274: pushl %ebp
1275: movl %esp,%ebp
1276: movl 8(%esp), %edx
1.67.4.2! yamt 1277: movl $(PAGE_SIZE/32), %ecx
1.50 ad 1278: xorl %eax, %eax
1279: .align 16
1280: 1:
1.67.4.2! yamt 1281: testl $RESCHED_KPREEMPT, CPUVAR(RESCHED)
! 1282: jnz 2f
1.50 ad 1283: movnti %eax, 0(%edx)
1284: movnti %eax, 4(%edx)
1285: movnti %eax, 8(%edx)
1286: movnti %eax, 12(%edx)
1287: movnti %eax, 16(%edx)
1288: movnti %eax, 20(%edx)
1289: movnti %eax, 24(%edx)
1290: movnti %eax, 28(%edx)
1.67.4.2! yamt 1291: addl $32, %edx
! 1292: decl %ecx
1.50 ad 1293: jnz 1b
1294: sfence
1.67.4.2! yamt 1295: incl %eax
1.50 ad 1296: pop %ebp
1297: ret
1.67.4.2! yamt 1298: 2:
1.50 ad 1299: sfence
1300: popl %ebp
1301: ret
1.67.4.2! yamt 1302: END(sse2_idlezero_page)
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