Annotation of src/sys/arch/i386/i386/locore.S, Revision 1.72.2.2
1.72.2.2! wrstuden 1: /* $NetBSD: locore.S,v 1.72.2.1 2008/06/23 04:30:26 wrstuden 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: /*-
1.48 yamt 74: * Copyright (c) 1998, 2000, 2004, 2006, 2007 The NetBSD Foundation, Inc.
1.1 fvdl 75: * All rights reserved.
76: *
77: * This code is derived from software contributed to The NetBSD Foundation
78: * by Charles M. Hannum.
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>
1.72.2.2! wrstuden 137: __KERNEL_RCSID(0, "$NetBSD: locore.S,v 1.72.2.1 2008/06/23 04:30:26 wrstuden Exp $");
1.59 lukem 138:
1.18 christos 139: #include "opt_compat_oldboot.h"
1.1 fvdl 140: #include "opt_ddb.h"
141: #include "opt_realmem.h"
1.18 christos 142: #include "opt_vm86.h"
1.62 bouyer 143: #include "opt_xen.h"
1.1 fvdl 144:
145: #include "npx.h"
146: #include "assym.h"
147: #include "lapic.h"
148: #include "ioapic.h"
1.8 fvdl 149: #include "ksyms.h"
1.1 fvdl 150:
151: #include <sys/errno.h>
152: #include <sys/syscall.h>
153:
154: #include <machine/cputypes.h>
155: #include <machine/segments.h>
156: #include <machine/specialreg.h>
157: #include <machine/trap.h>
158: #include <machine/i82489reg.h>
1.48 yamt 159: #include <machine/frameasm.h>
160: #include <machine/i82489reg.h>
1.62 bouyer 161: #ifndef XEN
162: #include <machine/multiboot.h>
163: #endif
1.1 fvdl 164:
165: /* XXX temporary kluge; these should not be here */
166: /* Get definitions for IOM_BEGIN, IOM_END, and IOM_SIZE */
167: #include <dev/isa/isareg.h>
168:
1.62 bouyer 169: #ifdef XEN
170: /*
171: * Xen guest identifier and loader selection
172: */
173: .section __xen_guest
174: #ifdef XEN3
175: .ascii "GUEST_OS=netbsd,GUEST_VER=3.0,XEN_VER=xen-3.0"
176: #if defined(DOM0OPS) || !defined(XEN_COMPAT_030001)
177: .ascii ",VIRT_BASE=0xc0000000" /* KERNBASE */
178: .ascii ",ELF_PADDR_OFFSET=0xc0000000" /* KERNBASE */
179: #else
180: .ascii ",VIRT_BASE=0xc0100000" /* KERNTEXTOFF */
181: .ascii ",ELF_PADDR_OFFSET=0xc0100000" /* KERNTEXTOFF */
182: #endif
183: .ascii ",VIRT_ENTRY=0xc0100000" /* KERNTEXTOFF */
184: #if !defined(XEN_COMPAT_030001)
185: .ascii ",HYPERCALL_PAGE=0x00000101"
186: /* (???+HYPERCALL_PAGE_OFFSET)/PAGE_SIZE) */
187: #endif
1.66 bouyer 188: #ifdef PAE
189: .ascii ",PAE=yes[extended-cr3]"
190: #endif
1.62 bouyer 191: #else /* !XEN3 */
192: .ascii "GUEST_OS=netbsd,GUEST_VER=2.0,XEN_VER=2.0"
193: #endif /* XEN3 */
194: .ascii ",LOADER=generic"
195: #if (NKSYMS || defined(DDB) || defined(LKM)) && !defined(SYMTAB_SPACE)
196: .ascii ",BSD_SYMTAB=yes"
197: #endif
198: .byte 0
199: #endif
200:
1.1 fvdl 201: /*
202: * Initialization
203: */
204: .data
205:
206: .globl _C_LABEL(cpu)
1.72.2.1 wrstuden 207: .globl _C_LABEL(cpuid_level)
1.38 jmmv 208: .globl _C_LABEL(esym)
1.71 ad 209: .globl _C_LABEL(eblob)
1.38 jmmv 210: .globl _C_LABEL(atdevbase)
1.40 yamt 211: .globl _C_LABEL(proc0uarea),_C_LABEL(PDPpaddr)
1.1 fvdl 212: .globl _C_LABEL(gdt)
213: .globl _C_LABEL(idt)
1.30 junyoung 214: .globl _C_LABEL(lapic_tpr)
215:
1.1 fvdl 216: #if NLAPIC > 0
217: #ifdef __ELF__
1.7 thorpej 218: .align PAGE_SIZE
1.1 fvdl 219: #else
220: .align 12
221: #endif
222: .globl _C_LABEL(local_apic), _C_LABEL(lapic_id)
223: _C_LABEL(local_apic):
224: .space LAPIC_ID
1.30 junyoung 225: _C_LABEL(lapic_id):
1.1 fvdl 226: .long 0x00000000
227: .space LAPIC_TPRI-(LAPIC_ID+4)
1.30 junyoung 228: _C_LABEL(lapic_tpr):
1.1 fvdl 229: .space LAPIC_PPRI-LAPIC_TPRI
1.30 junyoung 230: _C_LABEL(lapic_ppr):
1.1 fvdl 231: .space LAPIC_ISR-LAPIC_PPRI
232: _C_LABEL(lapic_isr):
1.7 thorpej 233: .space PAGE_SIZE-LAPIC_ISR
1.1 fvdl 234: #else
1.30 junyoung 235: _C_LABEL(lapic_tpr):
1.1 fvdl 236: .long 0
237: #endif
1.30 junyoung 238:
1.48 yamt 239: _C_LABEL(cpu): .long 0 # are we 80486, Pentium, or..
1.72.2.1 wrstuden 240: _C_LABEL(cpuid_level): .long 0
1.1 fvdl 241: _C_LABEL(atdevbase): .long 0 # location of start of iomem in virtual
1.40 yamt 242: _C_LABEL(proc0uarea): .long 0
1.31 junyoung 243: _C_LABEL(PDPpaddr): .long 0 # paddr of PDP, for libkvm
1.53 yamt 244: _C_LABEL(tablesize): .long 0
1.30 junyoung 245:
1.63 bouyer 246: .space 512
1.1 fvdl 247: tmpstk:
248:
1.62 bouyer 249: #ifndef XEN
1.35 yamt 250: #define _RELOC(x) ((x) - KERNBASE)
1.62 bouyer 251: #else
252: #define _RELOC(x) ((x))
253: #endif /* XEN */
1.1 fvdl 254: #define RELOC(x) _RELOC(_C_LABEL(x))
255:
256: .text
257: .globl _C_LABEL(kernel_text)
258: .set _C_LABEL(kernel_text),KERNTEXTOFF
259:
260: .globl start
1.62 bouyer 261: #ifndef XEN
1.1 fvdl 262: start: movw $0x1234,0x472 # warm boot
263:
1.37 jmmv 264: #if defined(MULTIBOOT)
265: jmp 1f
266:
267: .align 4
268: .globl Multiboot_Header
269: _C_LABEL(Multiboot_Header):
1.44 jmmv 270: #define MULTIBOOT_HEADER_FLAGS (MULTIBOOT_HEADER_WANT_MEMORY)
1.37 jmmv 271: .long MULTIBOOT_HEADER_MAGIC
272: .long MULTIBOOT_HEADER_FLAGS
273: .long -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS)
274:
275: 1:
276: /* Check if we are being executed by a Multiboot-compliant boot
277: * loader. */
278: cmpl $MULTIBOOT_INFO_MAGIC,%eax
279: jne 1f
280:
1.43 mrg 281: /*
282: * Indeed, a multiboot-compliant boot loader executed us. We copy
1.37 jmmv 283: * the received Multiboot information structure into kernel's data
284: * space to process it later -- after we are relocated. It will
1.43 mrg 285: * be safer to run complex C code than doing it at this point.
286: */
1.37 jmmv 287: pushl %ebx # Address of Multiboot information
288: call _C_LABEL(multiboot_pre_reloc)
289: addl $4,%esp
1.38 jmmv 290: jmp 2f
1.37 jmmv 291: #endif
292:
293: 1:
1.1 fvdl 294: /*
1.38 jmmv 295: * At this point, we know that a NetBSD-specific boot loader
296: * booted this kernel. The stack carries the following parameters:
1.41 jmmv 297: * (boothowto, [bootdev], bootinfo, esym, biosextmem, biosbasemem),
1.38 jmmv 298: * 4 bytes each.
1.1 fvdl 299: */
1.38 jmmv 300: addl $4,%esp # Discard return address to boot loader
301: call _C_LABEL(native_loader)
302: addl $24,%esp
1.1 fvdl 303:
304: 2:
305: /* First, reset the PSL. */
306: pushl $PSL_MBO
307: popfl
308:
309: /* Clear segment registers; always null in proc0. */
310: xorl %eax,%eax
311: movw %ax,%fs
312: movw %ax,%gs
313: decl %eax
1.72.2.1 wrstuden 314: movl %eax,RELOC(cpuid_level)
1.1 fvdl 315:
316: /* Find out our CPU type. */
317:
318: try386: /* Try to toggle alignment check flag; does not exist on 386. */
319: pushfl
320: popl %eax
321: movl %eax,%ecx
322: orl $PSL_AC,%eax
323: pushl %eax
324: popfl
325: pushfl
326: popl %eax
327: xorl %ecx,%eax
328: andl $PSL_AC,%eax
329: pushl %ecx
330: popfl
331:
332: testl %eax,%eax
333: jnz try486
334:
335: /*
336: * Try the test of a NexGen CPU -- ZF will not change on a DIV
337: * instruction on a NexGen, it will on an i386. Documented in
338: * Nx586 Processor Recognition Application Note, NexGen, Inc.
339: */
340: movl $0x5555,%eax
341: xorl %edx,%edx
342: movl $2,%ecx
343: divl %ecx
344: jnz is386
345:
346: isnx586:
347: /*
348: * Don't try cpuid, as Nx586s reportedly don't support the
349: * PSL_ID bit.
350: */
351: movl $CPU_NX586,RELOC(cpu)
352: jmp 2f
353:
354: is386:
355: movl $CPU_386,RELOC(cpu)
356: jmp 2f
357:
358: try486: /* Try to toggle identification flag; does not exist on early 486s. */
359: pushfl
360: popl %eax
361: movl %eax,%ecx
362: xorl $PSL_ID,%eax
363: pushl %eax
364: popfl
365: pushfl
366: popl %eax
367: xorl %ecx,%eax
368: andl $PSL_ID,%eax
369: pushl %ecx
370: popfl
371:
372: testl %eax,%eax
373: jnz try586
374: is486: movl $CPU_486,RELOC(cpu)
375: /*
376: * Check Cyrix CPU
377: * Cyrix CPUs do not change the undefined flags following
378: * execution of the divide instruction which divides 5 by 2.
379: *
380: * Note: CPUID is enabled on M2, so it passes another way.
381: */
382: pushfl
383: movl $0x5555, %eax
384: xorl %edx, %edx
385: movl $2, %ecx
386: clc
387: divl %ecx
388: jnc trycyrix486
389: popfl
390: jmp 2f
391: trycyrix486:
392: movl $CPU_6x86,RELOC(cpu) # set CPU type
393: /*
394: * Check for Cyrix 486 CPU by seeing if the flags change during a
395: * divide. This is documented in the Cx486SLC/e SMM Programmer's
396: * Guide.
397: */
398: xorl %edx,%edx
399: cmpl %edx,%edx # set flags to known state
400: pushfl
401: popl %ecx # store flags in ecx
402: movl $-1,%eax
403: movl $4,%ebx
404: divl %ebx # do a long division
405: pushfl
406: popl %eax
407: xorl %ecx,%eax # are the flags different?
408: testl $0x8d5,%eax # only check C|PF|AF|Z|N|V
409: jne 2f # yes; must be Cyrix 6x86 CPU
410: movl $CPU_486DLC,RELOC(cpu) # set CPU type
411:
412: #ifndef CYRIX_CACHE_WORKS
413: /* Disable caching of the ISA hole only. */
414: invd
415: movb $CCR0,%al # Configuration Register index (CCR0)
416: outb %al,$0x22
417: inb $0x23,%al
418: orb $(CCR0_NC1|CCR0_BARB),%al
419: movb %al,%ah
420: movb $CCR0,%al
421: outb %al,$0x22
422: movb %ah,%al
423: outb %al,$0x23
424: invd
425: #else /* CYRIX_CACHE_WORKS */
426: /* Set cache parameters */
427: invd # Start with guaranteed clean cache
428: movb $CCR0,%al # Configuration Register index (CCR0)
429: outb %al,$0x22
430: inb $0x23,%al
431: andb $~CCR0_NC0,%al
432: #ifndef CYRIX_CACHE_REALLY_WORKS
433: orb $(CCR0_NC1|CCR0_BARB),%al
434: #else
435: orb $CCR0_NC1,%al
436: #endif
437: movb %al,%ah
438: movb $CCR0,%al
439: outb %al,$0x22
440: movb %ah,%al
441: outb %al,$0x23
442: /* clear non-cacheable region 1 */
443: movb $(NCR1+2),%al
444: outb %al,$0x22
445: movb $NCR_SIZE_0K,%al
446: outb %al,$0x23
447: /* clear non-cacheable region 2 */
448: movb $(NCR2+2),%al
449: outb %al,$0x22
450: movb $NCR_SIZE_0K,%al
451: outb %al,$0x23
452: /* clear non-cacheable region 3 */
453: movb $(NCR3+2),%al
454: outb %al,$0x22
455: movb $NCR_SIZE_0K,%al
456: outb %al,$0x23
457: /* clear non-cacheable region 4 */
458: movb $(NCR4+2),%al
459: outb %al,$0x22
460: movb $NCR_SIZE_0K,%al
461: outb %al,$0x23
462: /* enable caching in CR0 */
463: movl %cr0,%eax
464: andl $~(CR0_CD|CR0_NW),%eax
465: movl %eax,%cr0
466: invd
467: #endif /* CYRIX_CACHE_WORKS */
468:
469: jmp 2f
470:
471: try586: /* Use the `cpuid' instruction. */
472: xorl %eax,%eax
473: cpuid
1.72.2.1 wrstuden 474: movl %eax,RELOC(cpuid_level)
1.1 fvdl 475:
476: 2:
477: /*
478: * Finished with old stack; load new %esp now instead of later so we
479: * can trace this code without having to worry about the trace trap
480: * clobbering the memory test or the zeroing of the bss+bootstrap page
481: * tables.
482: *
483: * The boot program should check:
484: * text+data <= &stack_variable - more_space_for_stack
485: * text+data+bss+pad+space_for_page_tables <= end_of_memory
486: * Oops, the gdt is in the carcass of the boot program so clearing
487: * the rest of memory is still not possible.
488: */
489: movl $_RELOC(tmpstk),%esp # bootstrap stack end location
490:
491: /*
492: * Virtual address space of kernel:
493: *
1.71 ad 494: * text | data | bss | [syms] | [blobs] | page dir | proc0 kstack | L1 ptp
495: * 0 1 2 3
1.1 fvdl 496: */
1.53 yamt 497:
498: #define PROC0_PDIR_OFF 0
499: #define PROC0_STK_OFF (PROC0_PDIR_OFF + PAGE_SIZE)
500: #define PROC0_PTP1_OFF (PROC0_STK_OFF + UPAGES * PAGE_SIZE)
501:
502: /*
503: * fillkpt
504: * eax = pte (page frame | control | status)
505: * ebx = page table address
506: * ecx = number of pages to map
507: */
508:
509: #define fillkpt \
510: 1: movl %eax,(%ebx) ; /* store phys addr */ \
511: addl $4,%ebx ; /* next pte/pde */ \
512: addl $PAGE_SIZE,%eax ; /* next phys page */ \
513: loop 1b ; \
514:
1.1 fvdl 515:
516: /* Find end of kernel image. */
517: movl $RELOC(end),%edi
1.71 ad 518:
1.8 fvdl 519: #if (NKSYMS || defined(DDB) || defined(LKM)) && !defined(SYMTAB_SPACE)
1.1 fvdl 520: /* Save the symbols (if loaded). */
521: movl RELOC(esym),%eax
522: testl %eax,%eax
523: jz 1f
1.35 yamt 524: subl $KERNBASE,%eax
1.1 fvdl 525: movl %eax,%edi
526: 1:
527: #endif
528:
1.71 ad 529: /* Skip over any modules/blobs. */
530: movl RELOC(eblob),%eax
531: testl %eax,%eax
532: jz 1f
533: subl $KERNBASE,%eax
534: movl %eax,%edi
535: 1:
1.53 yamt 536: /* Compute sizes */
1.71 ad 537: movl %edi,%esi
1.1 fvdl 538: addl $PGOFSET,%esi # page align up
539: andl $~PGOFSET,%esi
540:
1.53 yamt 541: /* nkptp[1] = (esi + ~L2_FRAME) >> L2_SHIFT + 1; */
542: movl %esi,%eax
543: addl $~L2_FRAME,%eax
544: shrl $L2_SHIFT,%eax
545: incl %eax /* one more ptp for VAs stolen by bootstrap */
546: 1: movl %eax,RELOC(nkptp)+1*4
547:
548: /* tablesize = (1 + UPAGES + nkptp) << PGSHIFT; */
549: addl $(1+UPAGES),%eax
550: shll $PGSHIFT,%eax
551: movl %eax,RELOC(tablesize)
552:
553: /* ensure that nkptp covers bootstrap tables */
554: addl %esi,%eax
555: addl $~L2_FRAME,%eax
556: shrl $L2_SHIFT,%eax
557: incl %eax
558: cmpl %eax,RELOC(nkptp)+1*4
559: jnz 1b
560:
561: /* Clear tables */
562: movl %esi,%edi
1.1 fvdl 563: xorl %eax,%eax
564: cld
1.53 yamt 565: movl RELOC(tablesize),%ecx
566: shrl $2,%ecx
1.1 fvdl 567: rep
568: stosl
569:
1.53 yamt 570: leal (PROC0_PTP1_OFF)(%esi), %ebx
1.1 fvdl 571:
572: /*
573: * Build initial page tables.
574: */
1.53 yamt 575: /*
576: * Compute &__data_start - KERNBASE. This can't be > 4G,
577: * or we can't deal with it anyway, since we can't load it in
578: * 32 bit mode. So use the bottom 32 bits.
579: */
580: movl $RELOC(__data_start),%edx
1.1 fvdl 581: andl $~PGOFSET,%edx
1.30 junyoung 582:
1.53 yamt 583: /*
584: * Skip the first MB.
585: */
1.1 fvdl 586: movl $_RELOC(KERNTEXTOFF),%eax
587: movl %eax,%ecx
1.53 yamt 588: shrl $(PGSHIFT-2),%ecx /* ((n >> PGSHIFT) << 2) for # pdes */
589: addl %ecx,%ebx
1.1 fvdl 590:
591: /* Map the kernel text read-only. */
592: movl %edx,%ecx
593: subl %eax,%ecx
594: shrl $PGSHIFT,%ecx
595: orl $(PG_V|PG_KR),%eax
596: fillkpt
597:
598: /* Map the data, BSS, and bootstrap tables read-write. */
599: leal (PG_V|PG_KW)(%edx),%eax
1.53 yamt 600: movl RELOC(tablesize),%ecx
1.1 fvdl 601: addl %esi,%ecx # end of tables
602: subl %edx,%ecx # subtract end of text
603: shrl $PGSHIFT,%ecx
604: fillkpt
605:
1.53 yamt 606: /* Map ISA I/O mem (later atdevbase) */
1.1 fvdl 607: movl $(IOM_BEGIN|PG_V|PG_KW/*|PG_N*/),%eax # having these bits set
608: movl $(IOM_SIZE>>PGSHIFT),%ecx # for this many pte s,
609: fillkpt
610:
611: /*
612: * Construct a page table directory.
613: */
1.53 yamt 614: /* Set up top level entries for identity mapping */
615: leal (PROC0_PDIR_OFF)(%esi),%ebx
616: leal (PROC0_PTP1_OFF)(%esi),%eax
617: orl $(PG_V|PG_KW), %eax
618: movl RELOC(nkptp)+1*4,%ecx
1.1 fvdl 619: fillkpt
620:
1.53 yamt 621: /* Set up top level entries for actual kernel mapping */
622: leal (PROC0_PDIR_OFF + L2_SLOT_KERNBASE*4)(%esi),%ebx
623: leal (PROC0_PTP1_OFF)(%esi),%eax
624: orl $(PG_V|PG_KW), %eax
625: movl RELOC(nkptp)+1*4,%ecx
1.1 fvdl 626: fillkpt
627:
628: /* Install a PDE recursively mapping page directory as a page table! */
1.53 yamt 629: leal (PROC0_PDIR_OFF + PDIR_SLOT_PTE*4)(%esi),%ebx
630: leal (PROC0_PDIR_OFF)(%esi),%eax
631: orl $(PG_V|PG_KW),%eax
632: movl %eax,(%ebx)
633:
1.1 fvdl 634:
1.31 junyoung 635: /* Save phys. addr of PDP, for libkvm. */
636: movl %esi,RELOC(PDPpaddr)
1.1 fvdl 637:
1.53 yamt 638: /*
639: * Startup checklist:
640: * 1. Load %cr3 with pointer to PDIR.
641: */
1.1 fvdl 642: movl %esi,%eax # phys address of ptd in proc 0
643: movl %eax,%cr3 # load ptd addr into mmu
1.53 yamt 644:
645: /*
646: * 2. Enable paging and the rest of it.
647: */
1.1 fvdl 648: movl %cr0,%eax # get control word
649: # enable paging & NPX emulation
650: orl $(CR0_PE|CR0_PG|CR0_NE|CR0_TS|CR0_EM|CR0_MP),%eax
1.72.2.2! wrstuden 651: movl %eax,%cr0 # and page NOW!
1.1 fvdl 652:
653: pushl $begin # jump to high mem
654: ret
655:
656: begin:
1.53 yamt 657: /*
658: * We have arrived.
659: * There's no need anymore for the identity mapping in low
660: * memory, remove it.
661: */
662: movl _C_LABEL(nkptp)+1*4,%ecx
663: leal (PROC0_PDIR_OFF)(%esi),%ebx # old, phys address of PDIR
664: addl $(KERNBASE), %ebx # new, virtual address of PDIR
1.1 fvdl 665: 1: movl $0,(%ebx)
1.53 yamt 666: addl $4,%ebx
1.1 fvdl 667: loop 1b
668:
669: /* Relocate atdevbase. */
1.53 yamt 670: movl $KERNBASE,%edx
671: addl _C_LABEL(tablesize),%edx
1.1 fvdl 672: addl %esi,%edx
673: movl %edx,_C_LABEL(atdevbase)
674:
675: /* Set up bootstrap stack. */
1.53 yamt 676: leal (PROC0_STK_OFF+KERNBASE)(%esi),%eax
1.40 yamt 677: movl %eax,_C_LABEL(proc0uarea)
678: leal (KSTACK_SIZE-FRAMESIZE)(%eax),%esp
679: movl %esi,(KSTACK_SIZE+PCB_CR3)(%eax) # pcb->pcb_cr3
1.1 fvdl 680: xorl %ebp,%ebp # mark end of frames
681:
1.37 jmmv 682: #if defined(MULTIBOOT)
683: /* It is now safe to parse the Multiboot information structure
684: * we saved before from C code. Note that we cannot delay its
685: * parsing any more because initgdt (called below) needs to make
686: * use of this information. */
687: call _C_LABEL(multiboot_post_reloc)
688: #endif
689:
1.1 fvdl 690: subl $NGDT*8, %esp # space for temporary gdt
691: pushl %esp
692: call _C_LABEL(initgdt)
693: addl $4,%esp
1.30 junyoung 694:
1.53 yamt 695: movl _C_LABEL(tablesize),%eax
1.1 fvdl 696: addl %esi,%eax # skip past stack and page tables
697:
698: pushl %eax
699: call _C_LABEL(init386) # wire 386 chip for unix operation
700: addl $4+NGDT*8,%esp # pop temporary gdt
701:
702: #ifdef SAFARI_FIFO_HACK
703: movb $5,%al
704: movw $0x37b,%dx
705: outb %al,%dx
706: movw $0x37f,%dx
707: inb %dx,%al
708: movb %al,%cl
709:
710: orb $1,%cl
711:
712: movb $5,%al
713: movw $0x37b,%dx
714: outb %al,%dx
715: movw $0x37f,%dx
716: movb %cl,%al
717: outb %al,%dx
718: #endif /* SAFARI_FIFO_HACK */
719:
720: call _C_LABEL(main)
1.62 bouyer 721: #else /* XEN */
722: start:
723: /* First, reset the PSL. */
724: pushl $PSL_MBO
725: popfl
726:
727: cld
728: #ifdef XEN3
729: movl %esp, %ebx # save start of available space
730: #else
731: movl %esi,%ebx # save start_info pointer
732: #endif
733: movl $_RELOC(tmpstk),%esp # bootstrap stack end location
734:
735: /* Clear BSS first so that there are no surprises... */
736: xorl %eax,%eax
737: movl $RELOC(__bss_start),%edi
738: movl $RELOC(_end),%ecx
739: subl %edi,%ecx
740: rep stosb
741:
742: /* Copy the necessary stuff from start_info structure. */
743: /* We need to copy shared_info early, so that sti/cli work */
744: movl $RELOC(start_info_union),%edi
745: movl $128,%ecx
746: rep movsl
747:
748: /* Clear segment registers; always null in proc0. */
749: xorl %eax,%eax
750: movw %ax,%fs
751: movw %ax,%gs
752: decl %eax
1.72.2.1 wrstuden 753: movl %eax,RELOC(cpuid_level)
1.62 bouyer 754:
755: xorl %eax,%eax
756: cpuid
1.72.2.1 wrstuden 757: movl %eax,RELOC(cpuid_level)
1.62 bouyer 758:
759: call xen_pmap_bootstrap
760: /*
761: * First avail returned by xen_pmap_bootstrap in %eax
762: */
763: movl %eax, %esi;
764: movl %esi, _C_LABEL(proc0uarea)
765:
766: #define PROC0PDIR ((0) * PAGE_SIZE)
767: #define PROC0STACK ((1) * PAGE_SIZE)
768:
769: /* Set up bootstrap stack. */
770: leal (KSTACK_SIZE-FRAMESIZE)(%eax),%esp
771: xorl %ebp,%ebp # mark end of frames
772:
773: addl $USPACE, %esi
774: subl $KERNBASE, %esi #init386 want a physical address
775: pushl %esi
776: call _C_LABEL(init386) # wire 386 chip for unix operation
777: addl $4,%esp
778: call _C_LABEL(main)
779:
780: #if defined(XEN3) && !defined(XEN_COMPAT_030001)
781: /* space for the hypercall call page */
782: #define HYPERCALL_PAGE_OFFSET 0x1000
783: .org HYPERCALL_PAGE_OFFSET
784: ENTRY(hypercall_page)
785: .skip 0x1000
786: #endif /* defined(XEN3) && !defined(XEN_COMPAT_030001) */
787:
788: /*
789: * void lgdt_finish(void);
790: * Finish load a new GDT pointer (do any necessary cleanup).
791: * XXX It's somewhat questionable whether reloading all the segment registers
792: * is necessary, since the actual descriptor data is not changed except by
793: * process creation and exit, both of which clean up via task switches. OTOH,
794: * this only happens at run time when the GDT is resized.
795: */
796: /* LINTSTUB: Func: void lgdt_finish(void) */
797: NENTRY(lgdt_finish)
798: movl $GSEL(GDATA_SEL, SEL_KPL),%eax
799: movw %ax,%ds
800: movw %ax,%es
801: movw %ax,%gs
802: movw %ax,%ss
803: movl $GSEL(GCPU_SEL, SEL_KPL),%eax
804: movw %ax,%fs
805: /* Reload code selector by doing intersegment return. */
806: popl %eax
807: pushl $GSEL(GCODE_SEL, SEL_KPL)
808: pushl %eax
809: lret
1.72 yamt 810: END(lgdt_finish)
1.62 bouyer 811:
812: #endif /* XEN */
1.1 fvdl 813:
814: /*
1.48 yamt 815: * void lwp_trampoline(void);
816: *
1.1 fvdl 817: * This is a trampoline function pushed onto the stack of a newly created
818: * process in order to do some additional setup. The trampoline is entered by
819: * cpu_switch()ing to the process, so we abuse the callee-saved registers used
820: * by cpu_switch() to store the information about the stub to call.
821: * NOTE: This function does not have a normal calling sequence!
822: */
1.48 yamt 823: NENTRY(lwp_trampoline)
1.68 ad 824: movl %ebp,%edi /* for .Lsyscall_checkast */
1.48 yamt 825: xorl %ebp,%ebp
1.68 ad 826: pushl %edi
1.48 yamt 827: pushl %eax
828: call _C_LABEL(lwp_startup)
829: addl $8,%esp
1.1 fvdl 830: pushl %ebx
831: call *%esi
832: addl $4,%esp
1.68 ad 833: jmp .Lsyscall_checkast
1.1 fvdl 834: /* NOTREACHED */
1.72 yamt 835: END(lwp_trampoline)
1.1 fvdl 836:
837: /*
1.48 yamt 838: * sigcode()
839: *
840: * Signal trampoline; copied to top of user stack. Used only for
841: * compatibility with old releases of NetBSD.
1.1 fvdl 842: */
843: NENTRY(sigcode)
844: /*
845: * Handler has returned here as if we called it. The sigcontext
846: * is on the stack after the 3 args "we" pushed.
847: */
848: leal 12(%esp),%eax # get pointer to sigcontext
849: movl %eax,4(%esp) # put it in the argument slot
850: # fake return address already there
1.17 christos 851: movl $SYS_compat_16___sigreturn14,%eax
1.1 fvdl 852: int $0x80 # enter kernel with args on stack
853: movl $SYS_exit,%eax
854: int $0x80 # exit if sigreturn fails
855: .globl _C_LABEL(esigcode)
856: _C_LABEL(esigcode):
1.72 yamt 857: END(sigcode)
1.1 fvdl 858:
859: /*
1.48 yamt 860: * int setjmp(label_t *)
861: *
862: * Used primarily by DDB.
1.1 fvdl 863: */
864: ENTRY(setjmp)
865: movl 4(%esp),%eax
866: movl %ebx,(%eax) # save ebx
867: movl %esp,4(%eax) # save esp
868: movl %ebp,8(%eax) # save ebp
869: movl %esi,12(%eax) # save esi
870: movl %edi,16(%eax) # save edi
871: movl (%esp),%edx # get rta
872: movl %edx,20(%eax) # save eip
1.48 yamt 873: xorl %eax,%eax # return 0
1.1 fvdl 874: ret
1.72 yamt 875: END(setjmp)
1.1 fvdl 876:
1.48 yamt 877: /*
878: * int longjmp(label_t *)
879: *
880: * Used primarily by DDB.
881: */
1.1 fvdl 882: ENTRY(longjmp)
883: movl 4(%esp),%eax
884: movl (%eax),%ebx # restore ebx
885: movl 4(%eax),%esp # restore esp
886: movl 8(%eax),%ebp # restore ebp
887: movl 12(%eax),%esi # restore esi
888: movl 16(%eax),%edi # restore edi
889: movl 20(%eax),%edx # get rta
890: movl %edx,(%esp) # put in return frame
1.48 yamt 891: movl $1,%eax # return 1
1.1 fvdl 892: ret
1.72 yamt 893: END(longjmp)
1.1 fvdl 894:
1.65 skrll 895: /*
896: * void dumpsys(void)
897: *
898: * Mimic cpu_switchto() for postmortem debugging.
899: */
1.64 skrll 900: ENTRY(dumpsys)
1.65 skrll 901: pushl %ebx # set up fake switchframe
902: pushl %esi # and save context
903: pushl %edi
904: movl %esp,_C_LABEL(dumppcb)+PCB_ESP
905: movl %ebp,_C_LABEL(dumppcb)+PCB_EBP
906: call _C_LABEL(dodumpsys) # dump!
907: addl $(3*4), %esp # unwind switchframe
1.64 skrll 908: ret
1.72 yamt 909: END(dumpsys)
1.64 skrll 910:
1.1 fvdl 911: /*
1.58 ad 912: * struct lwp *cpu_switchto(struct lwp *oldlwp, struct newlwp,
913: * bool returning)
1.30 junyoung 914: *
1.48 yamt 915: * 1. if (oldlwp != NULL), save its context.
916: * 2. then, restore context of newlwp.
917: *
918: * Note that the stack frame layout is known to "struct switchframe" in
919: * <machine/frame.h> and to the code in cpu_lwp_fork() which initializes
1.5 thorpej 920: * it for a new lwp.
1.1 fvdl 921: */
1.48 yamt 922: ENTRY(cpu_switchto)
1.1 fvdl 923: pushl %ebx
924: pushl %esi
925: pushl %edi
926:
1.70 ad 927: #if defined(DIAGNOSTIC) && !defined(XEN)
928: cmpl $IPL_SCHED,CPUVAR(ILEVEL)
929: jbe 0f
1.72.2.1 wrstuden 930: pushl CPUVAR(ILEVEL)
1.70 ad 931: pushl $.Lstr
932: call _C_LABEL(panic)
1.72.2.1 wrstuden 933: addl $8,%esp
934: .Lstr: .string "cpu_switchto: switching above IPL_SCHED (%d)\0"
1.70 ad 935: 0:
936: #endif
937:
1.48 yamt 938: movl 16(%esp),%esi # oldlwp
939: movl 20(%esp),%edi # newlwp
1.58 ad 940: movl 24(%esp),%edx # returning
1.48 yamt 941: testl %esi,%esi
942: jz 1f
1.1 fvdl 943:
1.48 yamt 944: /* Save old context. */
945: movl L_ADDR(%esi),%eax
946: movl %esp,PCB_ESP(%eax)
947: movl %ebp,PCB_EBP(%eax)
948:
949: /* Switch to newlwp's stack. */
950: 1: movl L_ADDR(%edi),%ebx
951: movl PCB_EBP(%ebx),%ebp
952: movl PCB_ESP(%ebx),%esp
1.1 fvdl 953:
1.61 ad 954: /*
955: * Set curlwp. This must be globally visible in order to permit
956: * non-interlocked mutex release.
957: */
958: movl %edi,%ecx
959: xchgl %ecx,CPUVAR(CURLWP)
1.58 ad 960:
961: /* Skip the rest if returning to a pinned LWP. */
962: testl %edx,%edx
963: jnz 4f
964:
1.62 bouyer 965: #ifdef XEN
966: pushl %edi
967: call _C_LABEL(i386_switch_context)
968: addl $4,%esp
969: #else /* XEN */
1.60 yamt 970: /* Switch ring0 esp */
971: movl PCB_ESP0(%ebx),%eax
972: movl %eax,CPUVAR(ESP0)
1.1 fvdl 973:
974: /* Don't bother with the rest if switching to a system process. */
1.48 yamt 975: testl $LW_SYSTEM,L_FLAG(%edi)
976: jnz 4f
1.1 fvdl 977:
1.54 ad 978: /* Restore thread-private %fs/%gs descriptors. */
1.60 yamt 979: movl CPUVAR(GDT),%ecx
1.55 ad 980: movl PCB_FSD(%ebx), %eax
981: movl PCB_FSD+4(%ebx), %edx
1.54 ad 982: movl %eax, (GUFS_SEL*8)(%ecx)
983: movl %edx, (GUFS_SEL*8+4)(%ecx)
1.55 ad 984: movl PCB_GSD(%ebx), %eax
985: movl PCB_GSD+4(%ebx), %edx
1.54 ad 986: movl %eax, (GUGS_SEL*8)(%ecx)
987: movl %edx, (GUGS_SEL*8+4)(%ecx)
1.62 bouyer 988: #endif /* XEN */
1.54 ad 989:
1.60 yamt 990: /* Switch I/O bitmap */
991: movl PCB_IOMAP(%ebx),%eax
992: orl %eax,%eax
993: jnz,pn .Lcopy_iobitmap
994: movl $(IOMAP_INVALOFF << 16),CPUVAR(IOBASE)
995: .Liobitmap_done:
996:
1.56 ad 997: /* Is this process using RAS (restartable atomic sequences)? */
998: movl L_PROC(%edi),%eax
999: cmpl $0,P_RASLIST(%eax)
1000: jne 5f
1001:
1.48 yamt 1002: /*
1003: * Restore cr0 (including FPU state). Raise the IPL to IPL_IPI.
1004: * FPU IPIs can alter the LWP's saved cr0. Dropping the priority
1005: * is deferred until mi_switch(), when cpu_switchto() returns.
1006: */
1.62 bouyer 1007: 2:
1008: #ifndef XEN
1009: movl $IPL_IPI,CPUVAR(ILEVEL)
1.48 yamt 1010: movl PCB_CR0(%ebx),%ecx
1011: movl %cr0,%edx
1.1 fvdl 1012:
1.30 junyoung 1013: /*
1.22 wiz 1014: * If our floating point registers are on a different CPU,
1.48 yamt 1015: * set CR0_TS so we'll trap rather than reuse bogus state.
1.1 fvdl 1016: */
1.48 yamt 1017: movl PCB_FPCPU(%ebx),%eax
1018: cmpl CPUVAR(SELF),%eax
1019: je 3f
1.1 fvdl 1020: orl $CR0_TS,%ecx
1.48 yamt 1021:
1022: /* Reloading CR0 is very expensive - avoid if possible. */
1023: 3: cmpl %edx,%ecx
1024: je 4f
1.1 fvdl 1025: movl %ecx,%cr0
1.62 bouyer 1026: #endif /* XEN */
1.1 fvdl 1027:
1.48 yamt 1028: /* Return to the new LWP, returning 'oldlwp' in %eax. */
1029: 4: movl %esi,%eax
1.1 fvdl 1030: popl %edi
1031: popl %esi
1032: popl %ebx
1033: ret
1.20 dsl 1034:
1.48 yamt 1035: /* Check for restartable atomic sequences (RAS). */
1036: 5: movl L_MD_REGS(%edi),%ecx
1037: pushl TF_EIP(%ecx)
1.20 dsl 1038: pushl %eax
1039: call _C_LABEL(ras_lookup)
1040: addl $8,%esp
1041: cmpl $-1,%eax
1.48 yamt 1042: je 2b
1.49 ad 1043: movl L_MD_REGS(%edi),%ecx
1044: movl %eax,TF_EIP(%ecx)
1.48 yamt 1045: jmp 2b
1.1 fvdl 1046:
1.60 yamt 1047: .Lcopy_iobitmap:
1048: /* Copy I/O bitmap. */
1049: movl $(IOMAPSIZE/4),%ecx
1050: pushl %esi
1051: pushl %edi
1052: movl %eax,%esi /* pcb_iomap */
1053: movl CPUVAR(SELF),%edi
1054: leal CPU_INFO_IOMAP(%edi),%edi
1055: rep
1056: movsl
1057: popl %edi
1058: popl %esi
1059: movl $((CPU_INFO_IOMAP - CPU_INFO_TSS) << 16),CPUVAR(IOBASE)
1060: jmp .Liobitmap_done
1.72 yamt 1061: END(cpu_switchto)
1.60 yamt 1062:
1.1 fvdl 1063: /*
1064: * void savectx(struct pcb *pcb);
1.48 yamt 1065: *
1.1 fvdl 1066: * Update pcb, saving current processor state.
1067: */
1068: ENTRY(savectx)
1.47 skrll 1069: movl 4(%esp),%edx # edx = pcb
1.1 fvdl 1070: movl %esp,PCB_ESP(%edx)
1071: movl %ebp,PCB_EBP(%edx)
1072: ret
1.72 yamt 1073: END(savectx)
1.1 fvdl 1074:
1075: /*
1.48 yamt 1076: * osyscall()
1077: *
1.1 fvdl 1078: * Old call gate entry for syscall
1079: */
1080: IDTVEC(osyscall)
1.48 yamt 1081: pushfl # set eflags in trap frame
1.1 fvdl 1082: popl 8(%esp)
1083: pushl $7 # size of instruction for restart
1084: jmp syscall1
1.72 yamt 1085: IDTVEC_END(osyscall)
1.1 fvdl 1086:
1087: /*
1.48 yamt 1088: * syscall()
1089: *
1.1 fvdl 1090: * Trap gate entry for syscall
1091: */
1092: IDTVEC(syscall)
1093: pushl $2 # size of instruction for restart
1094: syscall1:
1095: pushl $T_ASTFLT # trap # for doing ASTs
1096: INTRENTRY
1097: #ifdef DIAGNOSTIC
1098: movl CPUVAR(ILEVEL),%ebx
1099: testl %ebx,%ebx
1100: jz 1f
1101: pushl $5f
1102: call _C_LABEL(printf)
1103: addl $4,%esp
1104: #ifdef DDB
1105: int $3
1106: #endif
1.30 junyoung 1107: 1:
1.1 fvdl 1108: #endif /* DIAGNOSTIC */
1.67 ad 1109: incl CPUVAR(NSYSCALL) # count it atomically
1.68 ad 1110: movl CPUVAR(CURLWP),%edi
1111: movl L_PROC(%edi),%edx
1112: movl %esp,L_MD_REGS(%edi) # save pointer to frame
1.15 fvdl 1113: pushl %esp
1.1 fvdl 1114: call *P_MD_SYSCALL(%edx) # get pointer to syscall() function
1.15 fvdl 1115: addl $4,%esp
1.27 yamt 1116: .Lsyscall_checkast:
1.24 yamt 1117: /* Check for ASTs on exit to user mode. */
1.62 bouyer 1118: CLI(%eax)
1.68 ad 1119: movl L_MD_ASTPENDING(%edi), %eax
1120: orl CPUVAR(WANT_PMAPLOAD), %eax
1.24 yamt 1121: jnz 9f
1.62 bouyer 1122: #ifdef XEN
1123: STIC(%eax)
1124: jz 14f
1125: call _C_LABEL(stipending)
1126: testl %eax,%eax
1127: jz 14f
1128: /* process pending interrupts */
1129: CLI(%eax)
1130: movl CPUVAR(ILEVEL), %ebx
1131: movl $.Lsyscall_resume, %esi # address to resume loop at
1132: .Lsyscall_resume:
1133: movl %ebx,%eax # get cpl
1134: movl CPUVAR(IUNMASK)(,%eax,4),%eax
1135: andl CPUVAR(IPENDING),%eax # any non-masked bits left?
1136: jz 17f
1137: bsrl %eax,%eax
1138: btrl %eax,CPUVAR(IPENDING)
1139: movl CPUVAR(ISOURCES)(,%eax,4),%eax
1140: jmp *IS_RESUME(%eax)
1141: 17: movl %ebx, CPUVAR(ILEVEL) #restore cpl
1142: jmp .Lsyscall_checkast
1143: 14:
1144: #endif /* XEN */
1.1 fvdl 1145: #ifndef DIAGNOSTIC
1.24 yamt 1146: INTRFASTEXIT
1.1 fvdl 1147: #else /* DIAGNOSTIC */
1.24 yamt 1148: cmpl $IPL_NONE,CPUVAR(ILEVEL)
1.1 fvdl 1149: jne 3f
1150: INTRFASTEXIT
1.62 bouyer 1151: 3: STI(%eax)
1.1 fvdl 1152: pushl $4f
1153: call _C_LABEL(printf)
1154: addl $4,%esp
1.58 ad 1155: pushl $IPL_NONE
1156: call _C_LABEL(spllower)
1157: addl $4,%esp
1.53 yamt 1158: jmp .Lsyscall_checkast
1.1 fvdl 1159: 4: .asciz "WARNING: SPL NOT LOWERED ON SYSCALL EXIT\n"
1.30 junyoung 1160: 5: .asciz "WARNING: SPL NOT ZERO ON SYSCALL ENTRY\n"
1.1 fvdl 1161: #endif /* DIAGNOSTIC */
1.68 ad 1162: 9:
1163: cmpl $0, CPUVAR(WANT_PMAPLOAD)
1164: jz 10f
1165: STI(%eax)
1.24 yamt 1166: call _C_LABEL(pmap_load)
1.27 yamt 1167: jmp .Lsyscall_checkast /* re-check ASTs */
1.68 ad 1168: 10:
1169: /* Always returning to user mode here. */
1170: movl $0, L_MD_ASTPENDING(%edi)
1171: STI(%eax)
1172: /* Pushed T_ASTFLT into tf_trapno on entry. */
1173: pushl %esp
1174: call _C_LABEL(trap)
1175: addl $4,%esp
1176: jmp .Lsyscall_checkast /* re-check ASTs */
1.72 yamt 1177: IDTVEC_END(syscall)
1.1 fvdl 1178:
1179: #if NNPX > 0
1180: /*
1181: * Special interrupt handlers. Someday intr0-intr15 will be used to count
1182: * interrupts. We'll still need a special exception 16 handler. The busy
1183: * latch stuff in probintr() can be moved to npxprobe().
1184: */
1185:
1.48 yamt 1186: /*
1187: * void probeintr(void)
1188: */
1.1 fvdl 1189: NENTRY(probeintr)
1190: ss
1191: incl _C_LABEL(npx_intrs_while_probing)
1192: pushl %eax
1193: movb $0x20,%al # EOI (asm in strings loses cpp features)
1194: outb %al,$0xa0 # IO_ICU2
1195: outb %al,$0x20 # IO_ICU1
1196: movb $0,%al
1197: outb %al,$0xf0 # clear BUSY# latch
1198: popl %eax
1199: iret
1.72 yamt 1200: END(probeintr)
1.1 fvdl 1201:
1.48 yamt 1202: /*
1203: * void probetrap(void)
1204: */
1.1 fvdl 1205: NENTRY(probetrap)
1206: ss
1207: incl _C_LABEL(npx_traps_while_probing)
1208: fnclex
1209: iret
1.72 yamt 1210: END(probetrap)
1.1 fvdl 1211:
1.48 yamt 1212: /*
1213: * int npx586bug1(int a, int b)
1214: */
1.1 fvdl 1215: NENTRY(npx586bug1)
1216: fildl 4(%esp) # x
1217: fildl 8(%esp) # y
1218: fld %st(1)
1219: fdiv %st(1),%st # x/y
1220: fmulp %st,%st(1) # (x/y)*y
1221: fsubrp %st,%st(1) # x-(x/y)*y
1222: pushl $0
1223: fistpl (%esp)
1224: popl %eax
1225: ret
1.72 yamt 1226: END(npx586bug1)
1.1 fvdl 1227: #endif /* NNPX > 0 */
1.50 ad 1228:
1229: /*
1.72.2.1 wrstuden 1230: * void sse2_idlezero_page(void *pg)
1.50 ad 1231: *
1.72.2.1 wrstuden 1232: * Zero a page without polluting the cache. Preemption must be
1233: * disabled by the caller. Abort if a preemption is pending.
1.50 ad 1234: */
1.72.2.1 wrstuden 1235: ENTRY(sse2_idlezero_page)
1.50 ad 1236: pushl %ebp
1237: movl %esp,%ebp
1238: movl 8(%esp), %edx
1.72.2.1 wrstuden 1239: movl $(PAGE_SIZE/32), %ecx
1.50 ad 1240: xorl %eax, %eax
1241: .align 16
1242: 1:
1.72.2.1 wrstuden 1243: cmpl $0, CPUVAR(RESCHED)
1244: jnz 2f
1.50 ad 1245: movnti %eax, 0(%edx)
1246: movnti %eax, 4(%edx)
1247: movnti %eax, 8(%edx)
1248: movnti %eax, 12(%edx)
1249: movnti %eax, 16(%edx)
1250: movnti %eax, 20(%edx)
1251: movnti %eax, 24(%edx)
1252: movnti %eax, 28(%edx)
1.72.2.1 wrstuden 1253: addl $32, %edx
1254: decl %ecx
1.50 ad 1255: jnz 1b
1256: sfence
1.72.2.1 wrstuden 1257: incl %eax
1.50 ad 1258: pop %ebp
1259: ret
1.72.2.1 wrstuden 1260: 2:
1.50 ad 1261: sfence
1262: popl %ebp
1263: ret
1.72.2.1 wrstuden 1264: END(sse2_idlezero_page)
CVSweb <webmaster@jp.NetBSD.org>