Annotation of src/sys/arch/i386/i386/locore.S, Revision 1.95
1.95 ! joerg 1: /* $NetBSD: locore.S,v 1.94 2010/12/20 00:25:35 matt 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:
68: /*-
1.84 ad 69: * Copyright (c) 1998, 2000, 2004, 2006, 2007, 2009 The NetBSD Foundation, Inc.
1.1 fvdl 70: * All rights reserved.
71: *
72: * This code is derived from software contributed to The NetBSD Foundation
1.84 ad 73: * by Charles M. Hannum, and by Andrew Doran.
1.1 fvdl 74: *
75: * Redistribution and use in source and binary forms, with or without
76: * modification, are permitted provided that the following conditions
77: * are met:
78: * 1. Redistributions of source code must retain the above copyright
79: * notice, this list of conditions and the following disclaimer.
80: * 2. Redistributions in binary form must reproduce the above copyright
81: * notice, this list of conditions and the following disclaimer in the
82: * documentation and/or other materials provided with the distribution.
83: *
84: * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
85: * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
86: * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
87: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
88: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
89: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
90: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
91: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
92: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
93: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
94: * POSSIBILITY OF SUCH DAMAGE.
95: */
96:
97: /*-
98: * Copyright (c) 1990 The Regents of the University of California.
99: * All rights reserved.
100: *
101: * This code is derived from software contributed to Berkeley by
102: * William Jolitz.
103: *
104: * Redistribution and use in source and binary forms, with or without
105: * modification, are permitted provided that the following conditions
106: * are met:
107: * 1. Redistributions of source code must retain the above copyright
108: * notice, this list of conditions and the following disclaimer.
109: * 2. Redistributions in binary form must reproduce the above copyright
110: * notice, this list of conditions and the following disclaimer in the
111: * documentation and/or other materials provided with the distribution.
1.12 agc 112: * 3. Neither the name of the University nor the names of its contributors
1.1 fvdl 113: * may be used to endorse or promote products derived from this software
114: * without specific prior written permission.
115: *
116: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
117: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
118: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
119: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
120: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
121: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
122: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
123: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
124: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
125: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
126: * SUCH DAMAGE.
127: *
128: * @(#)locore.s 7.3 (Berkeley) 5/13/91
129: */
130:
1.59 lukem 131: #include <machine/asm.h>
1.95 ! joerg 132: __KERNEL_RCSID(0, "$NetBSD: locore.S,v 1.94 2010/12/20 00:25:35 matt Exp $");
1.59 lukem 133:
1.18 christos 134: #include "opt_compat_oldboot.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 "npx.h"
143: #include "assym.h"
144: #include "lapic.h"
145: #include "ioapic.h"
1.8 fvdl 146: #include "ksyms.h"
1.1 fvdl 147:
148: #include <sys/errno.h>
149: #include <sys/syscall.h>
150:
151: #include <machine/cputypes.h>
152: #include <machine/segments.h>
153: #include <machine/specialreg.h>
154: #include <machine/trap.h>
155: #include <machine/i82489reg.h>
1.48 yamt 156: #include <machine/frameasm.h>
157: #include <machine/i82489reg.h>
1.62 bouyer 158: #ifndef XEN
159: #include <machine/multiboot.h>
160: #endif
1.1 fvdl 161:
162: /* XXX temporary kluge; these should not be here */
163: /* Get definitions for IOM_BEGIN, IOM_END, and IOM_SIZE */
164: #include <dev/isa/isareg.h>
165:
1.62 bouyer 166: #ifdef XEN
167: /*
168: * Xen guest identifier and loader selection
169: */
170: .section __xen_guest
171: .ascii "GUEST_OS=netbsd,GUEST_VER=3.0,XEN_VER=xen-3.0"
172: #if defined(DOM0OPS) || !defined(XEN_COMPAT_030001)
173: .ascii ",VIRT_BASE=0xc0000000" /* KERNBASE */
174: .ascii ",ELF_PADDR_OFFSET=0xc0000000" /* KERNBASE */
175: #else
176: .ascii ",VIRT_BASE=0xc0100000" /* KERNTEXTOFF */
177: .ascii ",ELF_PADDR_OFFSET=0xc0100000" /* KERNTEXTOFF */
178: #endif
179: .ascii ",VIRT_ENTRY=0xc0100000" /* KERNTEXTOFF */
180: #if !defined(XEN_COMPAT_030001)
181: .ascii ",HYPERCALL_PAGE=0x00000101"
182: /* (???+HYPERCALL_PAGE_OFFSET)/PAGE_SIZE) */
183: #endif
1.66 bouyer 184: #ifdef PAE
185: .ascii ",PAE=yes[extended-cr3]"
186: #endif
1.62 bouyer 187: .ascii ",LOADER=generic"
1.80 ad 188: #if (NKSYMS || defined(DDB) || defined(MODULAR)) && !defined(SYMTAB_SPACE)
1.62 bouyer 189: .ascii ",BSD_SYMTAB=yes"
190: #endif
191: .byte 0
192: #endif
193:
1.1 fvdl 194: /*
195: * Initialization
196: */
197: .data
198:
199: .globl _C_LABEL(cpu)
1.73 ad 200: .globl _C_LABEL(cpuid_level)
1.38 jmmv 201: .globl _C_LABEL(esym)
1.71 ad 202: .globl _C_LABEL(eblob)
1.38 jmmv 203: .globl _C_LABEL(atdevbase)
1.91 rmind 204: .globl _C_LABEL(lwp0uarea),_C_LABEL(PDPpaddr)
1.1 fvdl 205: .globl _C_LABEL(gdt)
206: .globl _C_LABEL(idt)
1.30 junyoung 207: .globl _C_LABEL(lapic_tpr)
208:
1.1 fvdl 209: #if NLAPIC > 0
210: #ifdef __ELF__
1.7 thorpej 211: .align PAGE_SIZE
1.1 fvdl 212: #else
213: .align 12
214: #endif
215: .globl _C_LABEL(local_apic), _C_LABEL(lapic_id)
216: _C_LABEL(local_apic):
217: .space LAPIC_ID
1.30 junyoung 218: _C_LABEL(lapic_id):
1.1 fvdl 219: .long 0x00000000
220: .space LAPIC_TPRI-(LAPIC_ID+4)
1.30 junyoung 221: _C_LABEL(lapic_tpr):
1.1 fvdl 222: .space LAPIC_PPRI-LAPIC_TPRI
1.30 junyoung 223: _C_LABEL(lapic_ppr):
1.1 fvdl 224: .space LAPIC_ISR-LAPIC_PPRI
225: _C_LABEL(lapic_isr):
1.7 thorpej 226: .space PAGE_SIZE-LAPIC_ISR
1.1 fvdl 227: #else
1.30 junyoung 228: _C_LABEL(lapic_tpr):
1.1 fvdl 229: .long 0
230: #endif
1.30 junyoung 231:
1.48 yamt 232: _C_LABEL(cpu): .long 0 # are we 80486, Pentium, or..
1.73 ad 233: _C_LABEL(cpuid_level): .long 0
1.1 fvdl 234: _C_LABEL(atdevbase): .long 0 # location of start of iomem in virtual
1.91 rmind 235: _C_LABEL(lwp0uarea): .long 0
1.31 junyoung 236: _C_LABEL(PDPpaddr): .long 0 # paddr of PDP, for libkvm
1.53 yamt 237: _C_LABEL(tablesize): .long 0
1.30 junyoung 238:
1.63 bouyer 239: .space 512
1.1 fvdl 240: tmpstk:
241:
1.62 bouyer 242: #ifndef XEN
1.35 yamt 243: #define _RELOC(x) ((x) - KERNBASE)
1.62 bouyer 244: #else
245: #define _RELOC(x) ((x))
246: #endif /* XEN */
1.1 fvdl 247: #define RELOC(x) _RELOC(_C_LABEL(x))
248:
249: .text
250: .globl _C_LABEL(kernel_text)
251: .set _C_LABEL(kernel_text),KERNTEXTOFF
252:
253: .globl start
1.62 bouyer 254: #ifndef XEN
1.1 fvdl 255: start: movw $0x1234,0x472 # warm boot
256:
1.37 jmmv 257: #if defined(MULTIBOOT)
258: jmp 1f
259:
260: .align 4
261: .globl Multiboot_Header
262: _C_LABEL(Multiboot_Header):
1.44 jmmv 263: #define MULTIBOOT_HEADER_FLAGS (MULTIBOOT_HEADER_WANT_MEMORY)
1.37 jmmv 264: .long MULTIBOOT_HEADER_MAGIC
265: .long MULTIBOOT_HEADER_FLAGS
266: .long -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS)
267:
268: 1:
269: /* Check if we are being executed by a Multiboot-compliant boot
270: * loader. */
271: cmpl $MULTIBOOT_INFO_MAGIC,%eax
272: jne 1f
273:
1.43 mrg 274: /*
275: * Indeed, a multiboot-compliant boot loader executed us. We copy
1.37 jmmv 276: * the received Multiboot information structure into kernel's data
277: * space to process it later -- after we are relocated. It will
1.43 mrg 278: * be safer to run complex C code than doing it at this point.
279: */
1.37 jmmv 280: pushl %ebx # Address of Multiboot information
281: call _C_LABEL(multiboot_pre_reloc)
282: addl $4,%esp
1.38 jmmv 283: jmp 2f
1.37 jmmv 284: #endif
285:
286: 1:
1.1 fvdl 287: /*
1.38 jmmv 288: * At this point, we know that a NetBSD-specific boot loader
289: * booted this kernel. The stack carries the following parameters:
1.41 jmmv 290: * (boothowto, [bootdev], bootinfo, esym, biosextmem, biosbasemem),
1.38 jmmv 291: * 4 bytes each.
1.1 fvdl 292: */
1.38 jmmv 293: addl $4,%esp # Discard return address to boot loader
294: call _C_LABEL(native_loader)
295: addl $24,%esp
1.1 fvdl 296:
297: 2:
298: /* First, reset the PSL. */
299: pushl $PSL_MBO
300: popfl
301:
302: /* Clear segment registers; always null in proc0. */
303: xorl %eax,%eax
304: movw %ax,%fs
305: movw %ax,%gs
306: decl %eax
1.73 ad 307: movl %eax,RELOC(cpuid_level)
1.1 fvdl 308:
309: /* Find out our CPU type. */
310:
311: try386: /* Try to toggle alignment check flag; does not exist on 386. */
312: pushfl
313: popl %eax
314: movl %eax,%ecx
315: orl $PSL_AC,%eax
316: pushl %eax
317: popfl
318: pushfl
319: popl %eax
320: xorl %ecx,%eax
321: andl $PSL_AC,%eax
322: pushl %ecx
323: popfl
324:
325: testl %eax,%eax
326: jnz try486
327:
328: /*
329: * Try the test of a NexGen CPU -- ZF will not change on a DIV
330: * instruction on a NexGen, it will on an i386. Documented in
331: * Nx586 Processor Recognition Application Note, NexGen, Inc.
332: */
333: movl $0x5555,%eax
334: xorl %edx,%edx
335: movl $2,%ecx
336: divl %ecx
337: jnz is386
338:
339: isnx586:
340: /*
341: * Don't try cpuid, as Nx586s reportedly don't support the
342: * PSL_ID bit.
343: */
344: movl $CPU_NX586,RELOC(cpu)
345: jmp 2f
346:
347: is386:
348: movl $CPU_386,RELOC(cpu)
349: jmp 2f
350:
351: try486: /* Try to toggle identification flag; does not exist on early 486s. */
352: pushfl
353: popl %eax
354: movl %eax,%ecx
355: xorl $PSL_ID,%eax
356: pushl %eax
357: popfl
358: pushfl
359: popl %eax
360: xorl %ecx,%eax
361: andl $PSL_ID,%eax
362: pushl %ecx
363: popfl
364:
365: testl %eax,%eax
366: jnz try586
367: is486: movl $CPU_486,RELOC(cpu)
368: /*
369: * Check Cyrix CPU
370: * Cyrix CPUs do not change the undefined flags following
371: * execution of the divide instruction which divides 5 by 2.
372: *
373: * Note: CPUID is enabled on M2, so it passes another way.
374: */
375: pushfl
376: movl $0x5555, %eax
377: xorl %edx, %edx
378: movl $2, %ecx
379: clc
380: divl %ecx
381: jnc trycyrix486
382: popfl
383: jmp 2f
384: trycyrix486:
385: movl $CPU_6x86,RELOC(cpu) # set CPU type
386: /*
387: * Check for Cyrix 486 CPU by seeing if the flags change during a
388: * divide. This is documented in the Cx486SLC/e SMM Programmer's
389: * Guide.
390: */
391: xorl %edx,%edx
392: cmpl %edx,%edx # set flags to known state
393: pushfl
394: popl %ecx # store flags in ecx
395: movl $-1,%eax
396: movl $4,%ebx
397: divl %ebx # do a long division
398: pushfl
399: popl %eax
400: xorl %ecx,%eax # are the flags different?
401: testl $0x8d5,%eax # only check C|PF|AF|Z|N|V
402: jne 2f # yes; must be Cyrix 6x86 CPU
403: movl $CPU_486DLC,RELOC(cpu) # set CPU type
404:
405: #ifndef CYRIX_CACHE_WORKS
406: /* Disable caching of the ISA hole only. */
407: invd
408: movb $CCR0,%al # Configuration Register index (CCR0)
409: outb %al,$0x22
410: inb $0x23,%al
411: orb $(CCR0_NC1|CCR0_BARB),%al
412: movb %al,%ah
413: movb $CCR0,%al
414: outb %al,$0x22
415: movb %ah,%al
416: outb %al,$0x23
417: invd
418: #else /* CYRIX_CACHE_WORKS */
419: /* Set cache parameters */
420: invd # Start with guaranteed clean cache
421: movb $CCR0,%al # Configuration Register index (CCR0)
422: outb %al,$0x22
423: inb $0x23,%al
424: andb $~CCR0_NC0,%al
425: #ifndef CYRIX_CACHE_REALLY_WORKS
426: orb $(CCR0_NC1|CCR0_BARB),%al
427: #else
428: orb $CCR0_NC1,%al
429: #endif
430: movb %al,%ah
431: movb $CCR0,%al
432: outb %al,$0x22
433: movb %ah,%al
434: outb %al,$0x23
435: /* clear non-cacheable region 1 */
436: movb $(NCR1+2),%al
437: outb %al,$0x22
438: movb $NCR_SIZE_0K,%al
439: outb %al,$0x23
440: /* clear non-cacheable region 2 */
441: movb $(NCR2+2),%al
442: outb %al,$0x22
443: movb $NCR_SIZE_0K,%al
444: outb %al,$0x23
445: /* clear non-cacheable region 3 */
446: movb $(NCR3+2),%al
447: outb %al,$0x22
448: movb $NCR_SIZE_0K,%al
449: outb %al,$0x23
450: /* clear non-cacheable region 4 */
451: movb $(NCR4+2),%al
452: outb %al,$0x22
453: movb $NCR_SIZE_0K,%al
454: outb %al,$0x23
455: /* enable caching in CR0 */
456: movl %cr0,%eax
457: andl $~(CR0_CD|CR0_NW),%eax
458: movl %eax,%cr0
459: invd
460: #endif /* CYRIX_CACHE_WORKS */
461:
462: jmp 2f
463:
464: try586: /* Use the `cpuid' instruction. */
465: xorl %eax,%eax
466: cpuid
1.73 ad 467: movl %eax,RELOC(cpuid_level)
1.1 fvdl 468:
469: 2:
470: /*
471: * Finished with old stack; load new %esp now instead of later so we
472: * can trace this code without having to worry about the trace trap
473: * clobbering the memory test or the zeroing of the bss+bootstrap page
474: * tables.
475: *
476: * The boot program should check:
477: * text+data <= &stack_variable - more_space_for_stack
478: * text+data+bss+pad+space_for_page_tables <= end_of_memory
479: * Oops, the gdt is in the carcass of the boot program so clearing
480: * the rest of memory is still not possible.
481: */
482: movl $_RELOC(tmpstk),%esp # bootstrap stack end location
483:
484: /*
1.93 jym 485: * Virtual address space of kernel, without PAE. The page dir is 1 page long.
1.1 fvdl 486: *
1.71 ad 487: * text | data | bss | [syms] | [blobs] | page dir | proc0 kstack | L1 ptp
488: * 0 1 2 3
1.93 jym 489: *
490: * Virtual address space of kernel, with PAE. We need 4 pages for the page dir
491: * and 1 page for the L3.
492: * text | data | bss | [syms] | [blobs] | L3 | page dir | proc0 kstack | L1 ptp
493: * 0 1 5 6 7
1.1 fvdl 494: */
1.93 jym 495: #ifndef PAE
496: #define PROC0_PDIR_OFF 0
497: #else
498: #define PROC0_L3_OFF 0
499: #define PROC0_PDIR_OFF 1 * PAGE_SIZE
500: #endif
1.53 yamt 501:
1.93 jym 502: #define PROC0_STK_OFF (PROC0_PDIR_OFF + PDP_SIZE * PAGE_SIZE)
1.53 yamt 503: #define PROC0_PTP1_OFF (PROC0_STK_OFF + UPAGES * PAGE_SIZE)
504:
505: /*
1.93 jym 506: * fillkpt - Fill in a kernel page table
1.53 yamt 507: * eax = pte (page frame | control | status)
508: * ebx = page table address
509: * ecx = number of pages to map
1.93 jym 510: *
511: * For PAE, each entry is 8 bytes long: we must set the 4 upper bytes to 0.
512: * This is done by the first instruction of fillkpt. In the non-PAE case, this
513: * instruction just clears the page table entry.
1.53 yamt 514: */
515:
516: #define fillkpt \
1.93 jym 517: 1: movl $0,(PDE_SIZE-4)(%ebx) ; /* clear bits */ \
518: movl %eax,(%ebx) ; /* store phys addr */ \
519: addl $PDE_SIZE,%ebx ; /* next pte/pde */ \
520: addl $PAGE_SIZE,%eax ; /* next phys page */ \
521: loop 1b ;
1.1 fvdl 522:
523: /* Find end of kernel image. */
524: movl $RELOC(end),%edi
1.71 ad 525:
1.80 ad 526: #if (NKSYMS || defined(DDB) || defined(MODULAR)) && !defined(SYMTAB_SPACE)
1.1 fvdl 527: /* Save the symbols (if loaded). */
528: movl RELOC(esym),%eax
529: testl %eax,%eax
530: jz 1f
1.35 yamt 531: subl $KERNBASE,%eax
1.1 fvdl 532: movl %eax,%edi
533: 1:
534: #endif
535:
1.71 ad 536: /* Skip over any modules/blobs. */
537: movl RELOC(eblob),%eax
538: testl %eax,%eax
539: jz 1f
540: subl $KERNBASE,%eax
541: movl %eax,%edi
542: 1:
1.53 yamt 543: /* Compute sizes */
1.71 ad 544: movl %edi,%esi
1.1 fvdl 545: addl $PGOFSET,%esi # page align up
546: andl $~PGOFSET,%esi
547:
1.53 yamt 548: /* nkptp[1] = (esi + ~L2_FRAME) >> L2_SHIFT + 1; */
549: movl %esi,%eax
550: addl $~L2_FRAME,%eax
551: shrl $L2_SHIFT,%eax
552: incl %eax /* one more ptp for VAs stolen by bootstrap */
553: 1: movl %eax,RELOC(nkptp)+1*4
554:
1.93 jym 555: /* tablesize = (PDP_SIZE + UPAGES + nkptp) << PGSHIFT; */
556: addl $(PDP_SIZE+UPAGES),%eax
557: #ifdef PAE
558: incl %eax /* one more page for the L3 PD */
559: shll $PGSHIFT+1,%eax /* PTP tables are twice larger with PAE */
560: #else
1.53 yamt 561: shll $PGSHIFT,%eax
1.93 jym 562: #endif
1.53 yamt 563: movl %eax,RELOC(tablesize)
564:
565: /* ensure that nkptp covers bootstrap tables */
566: addl %esi,%eax
567: addl $~L2_FRAME,%eax
568: shrl $L2_SHIFT,%eax
569: incl %eax
570: cmpl %eax,RELOC(nkptp)+1*4
571: jnz 1b
572:
573: /* Clear tables */
574: movl %esi,%edi
1.1 fvdl 575: xorl %eax,%eax
576: cld
1.53 yamt 577: movl RELOC(tablesize),%ecx
578: shrl $2,%ecx
1.1 fvdl 579: rep
580: stosl
581:
1.53 yamt 582: leal (PROC0_PTP1_OFF)(%esi), %ebx
1.1 fvdl 583:
584: /*
585: * Build initial page tables.
586: */
1.53 yamt 587: /*
588: * Compute &__data_start - KERNBASE. This can't be > 4G,
589: * or we can't deal with it anyway, since we can't load it in
590: * 32 bit mode. So use the bottom 32 bits.
591: */
592: movl $RELOC(__data_start),%edx
1.1 fvdl 593: andl $~PGOFSET,%edx
1.30 junyoung 594:
1.53 yamt 595: /*
596: * Skip the first MB.
597: */
1.1 fvdl 598: movl $_RELOC(KERNTEXTOFF),%eax
599: movl %eax,%ecx
1.93 jym 600: shrl $(PGSHIFT-2),%ecx /* ((n >> PGSHIFT) << 2) for # pdes */
601: #ifdef PAE
602: shll $1,%ecx /* pdes are twice larger with PAE */
603: #endif
1.53 yamt 604: addl %ecx,%ebx
1.1 fvdl 605:
606: /* Map the kernel text read-only. */
607: movl %edx,%ecx
608: subl %eax,%ecx
609: shrl $PGSHIFT,%ecx
610: orl $(PG_V|PG_KR),%eax
611: fillkpt
612:
613: /* Map the data, BSS, and bootstrap tables read-write. */
614: leal (PG_V|PG_KW)(%edx),%eax
1.53 yamt 615: movl RELOC(tablesize),%ecx
1.1 fvdl 616: addl %esi,%ecx # end of tables
617: subl %edx,%ecx # subtract end of text
618: shrl $PGSHIFT,%ecx
619: fillkpt
620:
1.53 yamt 621: /* Map ISA I/O mem (later atdevbase) */
1.1 fvdl 622: movl $(IOM_BEGIN|PG_V|PG_KW/*|PG_N*/),%eax # having these bits set
623: movl $(IOM_SIZE>>PGSHIFT),%ecx # for this many pte s,
624: fillkpt
625:
626: /*
627: * Construct a page table directory.
628: */
1.53 yamt 629: /* Set up top level entries for identity mapping */
1.93 jym 630: leal (PROC0_PDIR_OFF)(%esi),%ebx
1.53 yamt 631: leal (PROC0_PTP1_OFF)(%esi),%eax
632: orl $(PG_V|PG_KW), %eax
633: movl RELOC(nkptp)+1*4,%ecx
1.1 fvdl 634: fillkpt
635:
1.53 yamt 636: /* Set up top level entries for actual kernel mapping */
1.93 jym 637: leal (PROC0_PDIR_OFF + L2_SLOT_KERNBASE*PDE_SIZE)(%esi),%ebx
1.53 yamt 638: leal (PROC0_PTP1_OFF)(%esi),%eax
639: orl $(PG_V|PG_KW), %eax
640: movl RELOC(nkptp)+1*4,%ecx
1.1 fvdl 641: fillkpt
642:
643: /* Install a PDE recursively mapping page directory as a page table! */
1.93 jym 644: leal (PROC0_PDIR_OFF + PDIR_SLOT_PTE*PDE_SIZE)(%esi),%ebx
645: leal (PROC0_PDIR_OFF)(%esi),%eax
1.53 yamt 646: orl $(PG_V|PG_KW),%eax
1.93 jym 647: movl $PDP_SIZE,%ecx
648: fillkpt
649:
650: #ifdef PAE
651: /* Fill in proc0 L3 page with entries pointing to the page dirs */
652: leal (PROC0_L3_OFF)(%esi),%ebx
653: leal (PROC0_PDIR_OFF)(%esi),%eax
654: orl $(PG_V),%eax
655: movl $PDP_SIZE,%ecx
656: fillkpt
657:
658: /* Enable PAE mode */
659: movl %cr4,%eax
660: orl $CR4_PAE,%eax
661: movl %eax,%cr4
662: #endif
1.1 fvdl 663:
1.31 junyoung 664: /* Save phys. addr of PDP, for libkvm. */
1.93 jym 665: leal (PROC0_PDIR_OFF)(%esi),%eax
666: movl %eax,RELOC(PDPpaddr)
1.1 fvdl 667:
1.93 jym 668: /*
669: * Startup checklist:
670: * 1. Load %cr3 with pointer to PDIR (or L3 PD page for PAE).
671: */
1.1 fvdl 672: movl %esi,%eax # phys address of ptd in proc 0
673: movl %eax,%cr3 # load ptd addr into mmu
1.93 jym 674:
1.53 yamt 675: /*
676: * 2. Enable paging and the rest of it.
677: */
1.1 fvdl 678: movl %cr0,%eax # get control word
679: # enable paging & NPX emulation
680: orl $(CR0_PE|CR0_PG|CR0_NE|CR0_TS|CR0_EM|CR0_MP),%eax
1.77 gmcgarry 681: movl %eax,%cr0 # and page NOW!
1.1 fvdl 682:
683: pushl $begin # jump to high mem
684: ret
685:
686: begin:
1.53 yamt 687: /*
688: * We have arrived.
689: * There's no need anymore for the identity mapping in low
690: * memory, remove it.
691: */
692: movl _C_LABEL(nkptp)+1*4,%ecx
1.93 jym 693: leal (PROC0_PDIR_OFF)(%esi),%ebx # old, phys address of PDIR
694: addl $(KERNBASE), %ebx # new, virtual address of PDIR
695: 1: movl $0,(PDE_SIZE-4)(%ebx) # Upper bits (for PAE)
696: movl $0,(%ebx)
697: addl $PDE_SIZE,%ebx
1.1 fvdl 698: loop 1b
699:
700: /* Relocate atdevbase. */
1.53 yamt 701: movl $KERNBASE,%edx
702: addl _C_LABEL(tablesize),%edx
1.1 fvdl 703: addl %esi,%edx
704: movl %edx,_C_LABEL(atdevbase)
705:
706: /* Set up bootstrap stack. */
1.53 yamt 707: leal (PROC0_STK_OFF+KERNBASE)(%esi),%eax
1.91 rmind 708: movl %eax,_C_LABEL(lwp0uarea)
1.40 yamt 709: leal (KSTACK_SIZE-FRAMESIZE)(%eax),%esp
710: movl %esi,(KSTACK_SIZE+PCB_CR3)(%eax) # pcb->pcb_cr3
1.1 fvdl 711: xorl %ebp,%ebp # mark end of frames
712:
1.37 jmmv 713: #if defined(MULTIBOOT)
714: /* It is now safe to parse the Multiboot information structure
715: * we saved before from C code. Note that we cannot delay its
716: * parsing any more because initgdt (called below) needs to make
717: * use of this information. */
718: call _C_LABEL(multiboot_post_reloc)
719: #endif
720:
1.1 fvdl 721: subl $NGDT*8, %esp # space for temporary gdt
722: pushl %esp
723: call _C_LABEL(initgdt)
724: addl $4,%esp
1.30 junyoung 725:
1.53 yamt 726: movl _C_LABEL(tablesize),%eax
1.1 fvdl 727: addl %esi,%eax # skip past stack and page tables
728:
1.93 jym 729: #ifdef PAE
730: pushl $0 # init386() expects a 64 bits paddr_t with PAE
731: #endif
1.1 fvdl 732: pushl %eax
733: call _C_LABEL(init386) # wire 386 chip for unix operation
1.93 jym 734: addl $PDE_SIZE,%esp # pop paddr_t
735: addl $NGDT*8,%esp # pop temporary gdt
1.1 fvdl 736:
737: #ifdef SAFARI_FIFO_HACK
738: movb $5,%al
739: movw $0x37b,%dx
740: outb %al,%dx
741: movw $0x37f,%dx
742: inb %dx,%al
743: movb %al,%cl
744:
745: orb $1,%cl
746:
747: movb $5,%al
748: movw $0x37b,%dx
749: outb %al,%dx
750: movw $0x37f,%dx
751: movb %cl,%al
752: outb %al,%dx
753: #endif /* SAFARI_FIFO_HACK */
754:
755: call _C_LABEL(main)
1.62 bouyer 756: #else /* XEN */
757: start:
758: /* First, reset the PSL. */
759: pushl $PSL_MBO
760: popfl
761:
762: cld
763: movl %esp, %ebx # save start of available space
764: movl $_RELOC(tmpstk),%esp # bootstrap stack end location
765:
766: /* Clear BSS first so that there are no surprises... */
767: xorl %eax,%eax
768: movl $RELOC(__bss_start),%edi
769: movl $RELOC(_end),%ecx
770: subl %edi,%ecx
771: rep stosb
772:
773: /* Copy the necessary stuff from start_info structure. */
774: /* We need to copy shared_info early, so that sti/cli work */
775: movl $RELOC(start_info_union),%edi
776: movl $128,%ecx
777: rep movsl
778:
779: /* Clear segment registers; always null in proc0. */
780: xorl %eax,%eax
781: movw %ax,%fs
782: movw %ax,%gs
783: decl %eax
1.73 ad 784: movl %eax,RELOC(cpuid_level)
1.62 bouyer 785:
786: xorl %eax,%eax
787: cpuid
1.73 ad 788: movl %eax,RELOC(cpuid_level)
1.62 bouyer 789:
790: call xen_pmap_bootstrap
1.92 jym 791:
1.62 bouyer 792: /*
793: * First avail returned by xen_pmap_bootstrap in %eax
794: */
795: movl %eax, %esi;
1.91 rmind 796: movl %esi, _C_LABEL(lwp0uarea)
1.62 bouyer 797:
798: /* Set up bootstrap stack. */
799: leal (KSTACK_SIZE-FRAMESIZE)(%eax),%esp
800: xorl %ebp,%ebp # mark end of frames
801:
802: addl $USPACE, %esi
803: subl $KERNBASE, %esi #init386 want a physical address
1.92 jym 804:
805: #ifdef PAE
806: pushl $0 # init386() expects a 64 bits paddr_t with PAE
807: #endif
1.62 bouyer 808: pushl %esi
809: call _C_LABEL(init386) # wire 386 chip for unix operation
1.93 jym 810: addl $PDE_SIZE,%esp # pop paddr_t
1.62 bouyer 811: call _C_LABEL(main)
812:
1.88 cegger 813: #if defined(XEN) && !defined(XEN_COMPAT_030001)
1.62 bouyer 814: /* space for the hypercall call page */
815: #define HYPERCALL_PAGE_OFFSET 0x1000
816: .org HYPERCALL_PAGE_OFFSET
817: ENTRY(hypercall_page)
818: .skip 0x1000
1.88 cegger 819: #endif /* defined(XEN) && !defined(XEN_COMPAT_030001) */
1.62 bouyer 820:
821: /*
822: * void lgdt_finish(void);
823: * Finish load a new GDT pointer (do any necessary cleanup).
824: * XXX It's somewhat questionable whether reloading all the segment registers
825: * is necessary, since the actual descriptor data is not changed except by
826: * process creation and exit, both of which clean up via task switches. OTOH,
827: * this only happens at run time when the GDT is resized.
828: */
829: /* LINTSTUB: Func: void lgdt_finish(void) */
830: NENTRY(lgdt_finish)
831: movl $GSEL(GDATA_SEL, SEL_KPL),%eax
832: movw %ax,%ds
833: movw %ax,%es
834: movw %ax,%gs
835: movw %ax,%ss
836: movl $GSEL(GCPU_SEL, SEL_KPL),%eax
837: movw %ax,%fs
838: /* Reload code selector by doing intersegment return. */
839: popl %eax
840: pushl $GSEL(GCODE_SEL, SEL_KPL)
841: pushl %eax
842: lret
1.72 yamt 843: END(lgdt_finish)
1.62 bouyer 844:
845: #endif /* XEN */
1.1 fvdl 846:
847: /*
1.48 yamt 848: * void lwp_trampoline(void);
849: *
1.1 fvdl 850: * This is a trampoline function pushed onto the stack of a newly created
851: * process in order to do some additional setup. The trampoline is entered by
852: * cpu_switch()ing to the process, so we abuse the callee-saved registers used
853: * by cpu_switch() to store the information about the stub to call.
854: * NOTE: This function does not have a normal calling sequence!
855: */
1.48 yamt 856: NENTRY(lwp_trampoline)
1.68 ad 857: movl %ebp,%edi /* for .Lsyscall_checkast */
1.48 yamt 858: xorl %ebp,%ebp
1.68 ad 859: pushl %edi
1.48 yamt 860: pushl %eax
861: call _C_LABEL(lwp_startup)
862: addl $8,%esp
1.1 fvdl 863: pushl %ebx
864: call *%esi
865: addl $4,%esp
1.68 ad 866: jmp .Lsyscall_checkast
1.1 fvdl 867: /* NOTREACHED */
1.72 yamt 868: END(lwp_trampoline)
1.1 fvdl 869:
870: /*
1.48 yamt 871: * sigcode()
872: *
873: * Signal trampoline; copied to top of user stack. Used only for
874: * compatibility with old releases of NetBSD.
1.1 fvdl 875: */
876: NENTRY(sigcode)
877: /*
878: * Handler has returned here as if we called it. The sigcontext
879: * is on the stack after the 3 args "we" pushed.
880: */
881: leal 12(%esp),%eax # get pointer to sigcontext
882: movl %eax,4(%esp) # put it in the argument slot
883: # fake return address already there
1.17 christos 884: movl $SYS_compat_16___sigreturn14,%eax
1.1 fvdl 885: int $0x80 # enter kernel with args on stack
886: movl $SYS_exit,%eax
887: int $0x80 # exit if sigreturn fails
888: .globl _C_LABEL(esigcode)
889: _C_LABEL(esigcode):
1.72 yamt 890: END(sigcode)
1.1 fvdl 891:
892: /*
1.48 yamt 893: * int setjmp(label_t *)
894: *
895: * Used primarily by DDB.
1.1 fvdl 896: */
897: ENTRY(setjmp)
898: movl 4(%esp),%eax
899: movl %ebx,(%eax) # save ebx
900: movl %esp,4(%eax) # save esp
901: movl %ebp,8(%eax) # save ebp
902: movl %esi,12(%eax) # save esi
903: movl %edi,16(%eax) # save edi
904: movl (%esp),%edx # get rta
905: movl %edx,20(%eax) # save eip
1.48 yamt 906: xorl %eax,%eax # return 0
1.1 fvdl 907: ret
1.72 yamt 908: END(setjmp)
1.1 fvdl 909:
1.48 yamt 910: /*
911: * int longjmp(label_t *)
912: *
913: * Used primarily by DDB.
914: */
1.1 fvdl 915: ENTRY(longjmp)
916: movl 4(%esp),%eax
917: movl (%eax),%ebx # restore ebx
918: movl 4(%eax),%esp # restore esp
919: movl 8(%eax),%ebp # restore ebp
920: movl 12(%eax),%esi # restore esi
921: movl 16(%eax),%edi # restore edi
922: movl 20(%eax),%edx # get rta
923: movl %edx,(%esp) # put in return frame
1.48 yamt 924: movl $1,%eax # return 1
1.1 fvdl 925: ret
1.72 yamt 926: END(longjmp)
1.1 fvdl 927:
1.65 skrll 928: /*
929: * void dumpsys(void)
930: *
931: * Mimic cpu_switchto() for postmortem debugging.
932: */
1.64 skrll 933: ENTRY(dumpsys)
1.65 skrll 934: pushl %ebx # set up fake switchframe
935: pushl %esi # and save context
936: pushl %edi
937: movl %esp,_C_LABEL(dumppcb)+PCB_ESP
938: movl %ebp,_C_LABEL(dumppcb)+PCB_EBP
939: call _C_LABEL(dodumpsys) # dump!
940: addl $(3*4), %esp # unwind switchframe
1.64 skrll 941: ret
1.72 yamt 942: END(dumpsys)
1.64 skrll 943:
1.1 fvdl 944: /*
1.79 ad 945: * struct lwp *cpu_switchto(struct lwp *oldlwp, struct *newlwp,
1.58 ad 946: * bool returning)
1.30 junyoung 947: *
1.48 yamt 948: * 1. if (oldlwp != NULL), save its context.
949: * 2. then, restore context of newlwp.
950: *
951: * Note that the stack frame layout is known to "struct switchframe" in
952: * <machine/frame.h> and to the code in cpu_lwp_fork() which initializes
1.5 thorpej 953: * it for a new lwp.
1.1 fvdl 954: */
1.48 yamt 955: ENTRY(cpu_switchto)
1.1 fvdl 956: pushl %ebx
957: pushl %esi
958: pushl %edi
959:
1.70 ad 960: #if defined(DIAGNOSTIC) && !defined(XEN)
961: cmpl $IPL_SCHED,CPUVAR(ILEVEL)
962: jbe 0f
1.74 christos 963: pushl CPUVAR(ILEVEL)
1.70 ad 964: pushl $.Lstr
965: call _C_LABEL(panic)
1.74 christos 966: addl $8,%esp
967: .Lstr: .string "cpu_switchto: switching above IPL_SCHED (%d)\0"
1.70 ad 968: 0:
969: #endif
970:
1.48 yamt 971: movl 16(%esp),%esi # oldlwp
972: movl 20(%esp),%edi # newlwp
1.58 ad 973: movl 24(%esp),%edx # returning
1.48 yamt 974: testl %esi,%esi
975: jz 1f
1.1 fvdl 976:
1.48 yamt 977: /* Save old context. */
1.91 rmind 978: movl L_PCB(%esi),%eax
1.48 yamt 979: movl %esp,PCB_ESP(%eax)
980: movl %ebp,PCB_EBP(%eax)
981:
982: /* Switch to newlwp's stack. */
1.91 rmind 983: 1: movl L_PCB(%edi),%ebx
1.48 yamt 984: movl PCB_EBP(%ebx),%ebp
985: movl PCB_ESP(%ebx),%esp
1.1 fvdl 986:
1.61 ad 987: /*
988: * Set curlwp. This must be globally visible in order to permit
989: * non-interlocked mutex release.
990: */
991: movl %edi,%ecx
992: xchgl %ecx,CPUVAR(CURLWP)
1.58 ad 993:
994: /* Skip the rest if returning to a pinned LWP. */
995: testl %edx,%edx
996: jnz 4f
997:
1.62 bouyer 998: #ifdef XEN
999: pushl %edi
1000: call _C_LABEL(i386_switch_context)
1001: addl $4,%esp
1002: #else /* XEN */
1.60 yamt 1003: /* Switch ring0 esp */
1004: movl PCB_ESP0(%ebx),%eax
1005: movl %eax,CPUVAR(ESP0)
1.1 fvdl 1006:
1007: /* Don't bother with the rest if switching to a system process. */
1.48 yamt 1008: testl $LW_SYSTEM,L_FLAG(%edi)
1009: jnz 4f
1.1 fvdl 1010:
1.54 ad 1011: /* Restore thread-private %fs/%gs descriptors. */
1.60 yamt 1012: movl CPUVAR(GDT),%ecx
1.55 ad 1013: movl PCB_FSD(%ebx), %eax
1014: movl PCB_FSD+4(%ebx), %edx
1.54 ad 1015: movl %eax, (GUFS_SEL*8)(%ecx)
1016: movl %edx, (GUFS_SEL*8+4)(%ecx)
1.55 ad 1017: movl PCB_GSD(%ebx), %eax
1018: movl PCB_GSD+4(%ebx), %edx
1.54 ad 1019: movl %eax, (GUGS_SEL*8)(%ecx)
1020: movl %edx, (GUGS_SEL*8+4)(%ecx)
1.62 bouyer 1021: #endif /* XEN */
1.54 ad 1022:
1.60 yamt 1023: /* Switch I/O bitmap */
1024: movl PCB_IOMAP(%ebx),%eax
1025: orl %eax,%eax
1.95 ! joerg 1026: jnz .Lcopy_iobitmap
1.60 yamt 1027: movl $(IOMAP_INVALOFF << 16),CPUVAR(IOBASE)
1028: .Liobitmap_done:
1029:
1.56 ad 1030: /* Is this process using RAS (restartable atomic sequences)? */
1031: movl L_PROC(%edi),%eax
1032: cmpl $0,P_RASLIST(%eax)
1033: jne 5f
1034:
1.48 yamt 1035: /*
1.90 rmind 1036: * Restore cr0 (including FPU state). Raise the IPL to IPL_HIGH.
1.48 yamt 1037: * FPU IPIs can alter the LWP's saved cr0. Dropping the priority
1038: * is deferred until mi_switch(), when cpu_switchto() returns.
1039: */
1.62 bouyer 1040: 2:
1041: #ifndef XEN
1.90 rmind 1042: movl $IPL_HIGH,CPUVAR(ILEVEL)
1.79 ad 1043: movl PCB_CR0(%ebx),%ecx /* has CR0_TS clear */
1.48 yamt 1044: movl %cr0,%edx
1.1 fvdl 1045:
1.30 junyoung 1046: /*
1.22 wiz 1047: * If our floating point registers are on a different CPU,
1.48 yamt 1048: * set CR0_TS so we'll trap rather than reuse bogus state.
1.1 fvdl 1049: */
1.79 ad 1050: cmpl CPUVAR(FPCURLWP),%edi
1.48 yamt 1051: je 3f
1.1 fvdl 1052: orl $CR0_TS,%ecx
1.48 yamt 1053:
1054: /* Reloading CR0 is very expensive - avoid if possible. */
1055: 3: cmpl %edx,%ecx
1056: je 4f
1.1 fvdl 1057: movl %ecx,%cr0
1.62 bouyer 1058: #endif /* XEN */
1.1 fvdl 1059:
1.48 yamt 1060: /* Return to the new LWP, returning 'oldlwp' in %eax. */
1061: 4: movl %esi,%eax
1.1 fvdl 1062: popl %edi
1063: popl %esi
1064: popl %ebx
1065: ret
1.20 dsl 1066:
1.48 yamt 1067: /* Check for restartable atomic sequences (RAS). */
1068: 5: movl L_MD_REGS(%edi),%ecx
1069: pushl TF_EIP(%ecx)
1.20 dsl 1070: pushl %eax
1071: call _C_LABEL(ras_lookup)
1072: addl $8,%esp
1073: cmpl $-1,%eax
1.48 yamt 1074: je 2b
1.49 ad 1075: movl L_MD_REGS(%edi),%ecx
1076: movl %eax,TF_EIP(%ecx)
1.48 yamt 1077: jmp 2b
1.1 fvdl 1078:
1.60 yamt 1079: .Lcopy_iobitmap:
1080: /* Copy I/O bitmap. */
1.86 ad 1081: incl _C_LABEL(pmap_iobmp_evcnt)+EV_COUNT
1.60 yamt 1082: movl $(IOMAPSIZE/4),%ecx
1083: pushl %esi
1084: pushl %edi
1085: movl %eax,%esi /* pcb_iomap */
1086: movl CPUVAR(SELF),%edi
1087: leal CPU_INFO_IOMAP(%edi),%edi
1088: rep
1089: movsl
1090: popl %edi
1091: popl %esi
1092: movl $((CPU_INFO_IOMAP - CPU_INFO_TSS) << 16),CPUVAR(IOBASE)
1093: jmp .Liobitmap_done
1.72 yamt 1094: END(cpu_switchto)
1.60 yamt 1095:
1.1 fvdl 1096: /*
1097: * void savectx(struct pcb *pcb);
1.48 yamt 1098: *
1.1 fvdl 1099: * Update pcb, saving current processor state.
1100: */
1101: ENTRY(savectx)
1.47 skrll 1102: movl 4(%esp),%edx # edx = pcb
1.1 fvdl 1103: movl %esp,PCB_ESP(%edx)
1104: movl %ebp,PCB_EBP(%edx)
1105: ret
1.72 yamt 1106: END(savectx)
1.1 fvdl 1107:
1108: /*
1.48 yamt 1109: * osyscall()
1110: *
1.1 fvdl 1111: * Old call gate entry for syscall
1112: */
1113: IDTVEC(osyscall)
1.87 ad 1114: #ifndef XEN
1115: /* XXX we are in trouble! interrupts be off here. */
1.85 ad 1116: cli # must be first instruction
1.87 ad 1117: #endif
1.48 yamt 1118: pushfl # set eflags in trap frame
1.1 fvdl 1119: popl 8(%esp)
1.85 ad 1120: orl $PSL_I,(%esp) # re-enable ints on return to user
1.1 fvdl 1121: pushl $7 # size of instruction for restart
1122: jmp syscall1
1.72 yamt 1123: IDTVEC_END(osyscall)
1.1 fvdl 1124:
1125: /*
1.48 yamt 1126: * syscall()
1127: *
1.1 fvdl 1128: * Trap gate entry for syscall
1129: */
1130: IDTVEC(syscall)
1131: pushl $2 # size of instruction for restart
1132: syscall1:
1133: pushl $T_ASTFLT # trap # for doing ASTs
1134: INTRENTRY
1.85 ad 1135: STI(%eax)
1.1 fvdl 1136: #ifdef DIAGNOSTIC
1137: movl CPUVAR(ILEVEL),%ebx
1138: testl %ebx,%ebx
1139: jz 1f
1140: pushl $5f
1.84 ad 1141: call _C_LABEL(panic)
1.1 fvdl 1142: addl $4,%esp
1143: #ifdef DDB
1144: int $3
1145: #endif
1.30 junyoung 1146: 1:
1.1 fvdl 1147: #endif /* DIAGNOSTIC */
1.94 matt 1148: addl $1,CPUVAR(NSYSCALL) # count it atomically
1149: adcl $0,CPUVAR(NSYSCALL)+4 # count it atomically
1.68 ad 1150: movl CPUVAR(CURLWP),%edi
1151: movl L_PROC(%edi),%edx
1152: movl %esp,L_MD_REGS(%edi) # save pointer to frame
1.15 fvdl 1153: pushl %esp
1.1 fvdl 1154: call *P_MD_SYSCALL(%edx) # get pointer to syscall() function
1.15 fvdl 1155: addl $4,%esp
1.27 yamt 1156: .Lsyscall_checkast:
1.24 yamt 1157: /* Check for ASTs on exit to user mode. */
1.62 bouyer 1158: CLI(%eax)
1.68 ad 1159: movl L_MD_ASTPENDING(%edi), %eax
1160: orl CPUVAR(WANT_PMAPLOAD), %eax
1.24 yamt 1161: jnz 9f
1.62 bouyer 1162: #ifdef XEN
1163: STIC(%eax)
1164: jz 14f
1165: call _C_LABEL(stipending)
1166: testl %eax,%eax
1167: jz 14f
1168: /* process pending interrupts */
1169: CLI(%eax)
1170: movl CPUVAR(ILEVEL), %ebx
1171: movl $.Lsyscall_resume, %esi # address to resume loop at
1172: .Lsyscall_resume:
1173: movl %ebx,%eax # get cpl
1174: movl CPUVAR(IUNMASK)(,%eax,4),%eax
1175: andl CPUVAR(IPENDING),%eax # any non-masked bits left?
1176: jz 17f
1177: bsrl %eax,%eax
1178: btrl %eax,CPUVAR(IPENDING)
1179: movl CPUVAR(ISOURCES)(,%eax,4),%eax
1180: jmp *IS_RESUME(%eax)
1181: 17: movl %ebx, CPUVAR(ILEVEL) #restore cpl
1182: jmp .Lsyscall_checkast
1183: 14:
1184: #endif /* XEN */
1.1 fvdl 1185: #ifndef DIAGNOSTIC
1.24 yamt 1186: INTRFASTEXIT
1.1 fvdl 1187: #else /* DIAGNOSTIC */
1.24 yamt 1188: cmpl $IPL_NONE,CPUVAR(ILEVEL)
1.1 fvdl 1189: jne 3f
1190: INTRFASTEXIT
1.62 bouyer 1191: 3: STI(%eax)
1.1 fvdl 1192: pushl $4f
1.84 ad 1193: call _C_LABEL(panic)
1.1 fvdl 1194: addl $4,%esp
1.58 ad 1195: pushl $IPL_NONE
1196: call _C_LABEL(spllower)
1197: addl $4,%esp
1.53 yamt 1198: jmp .Lsyscall_checkast
1.84 ad 1199: 4: .asciz "SPL NOT LOWERED ON SYSCALL EXIT\n"
1200: 5: .asciz "SPL NOT ZERO ON SYSCALL ENTRY\n"
1.1 fvdl 1201: #endif /* DIAGNOSTIC */
1.68 ad 1202: 9:
1203: cmpl $0, CPUVAR(WANT_PMAPLOAD)
1204: jz 10f
1205: STI(%eax)
1.24 yamt 1206: call _C_LABEL(pmap_load)
1.27 yamt 1207: jmp .Lsyscall_checkast /* re-check ASTs */
1.68 ad 1208: 10:
1209: /* Always returning to user mode here. */
1210: movl $0, L_MD_ASTPENDING(%edi)
1211: STI(%eax)
1212: /* Pushed T_ASTFLT into tf_trapno on entry. */
1213: pushl %esp
1214: call _C_LABEL(trap)
1215: addl $4,%esp
1216: jmp .Lsyscall_checkast /* re-check ASTs */
1.72 yamt 1217: IDTVEC_END(syscall)
1.1 fvdl 1218:
1.81 ad 1219: IDTVEC(svr4_fasttrap)
1220: pushl $2 # size of instruction for restart
1221: pushl $T_ASTFLT # trap # for doing ASTs
1222: INTRENTRY
1.85 ad 1223: STI(%eax)
1.81 ad 1224: pushl $RW_READER
1225: pushl $_C_LABEL(svr4_fasttrap_lock)
1226: call _C_LABEL(rw_enter)
1227: addl $8,%esp
1228: call *_C_LABEL(svr4_fasttrap_vec)
1229: pushl $_C_LABEL(svr4_fasttrap_lock)
1230: call _C_LABEL(rw_exit)
1231: addl $4,%esp
1232: 2: /* Check for ASTs on exit to user mode. */
1233: cli
1234: CHECK_ASTPENDING(%eax)
1235: je 1f
1236: /* Always returning to user mode here. */
1237: CLEAR_ASTPENDING(%eax)
1238: sti
1239: /* Pushed T_ASTFLT into tf_trapno on entry. */
1240: pushl %esp
1241: call _C_LABEL(trap)
1242: addl $4,%esp
1243: jmp 2b
1244: 1: CHECK_DEFERRED_SWITCH
1245: jnz 9f
1246: INTRFASTEXIT
1247: 9: sti
1248: call _C_LABEL(pmap_load)
1249: cli
1250: jmp 2b
1251:
1.1 fvdl 1252: #if NNPX > 0
1253: /*
1254: * Special interrupt handlers. Someday intr0-intr15 will be used to count
1255: * interrupts. We'll still need a special exception 16 handler. The busy
1256: * latch stuff in probintr() can be moved to npxprobe().
1257: */
1258:
1.48 yamt 1259: /*
1260: * void probeintr(void)
1261: */
1.1 fvdl 1262: NENTRY(probeintr)
1263: ss
1264: incl _C_LABEL(npx_intrs_while_probing)
1265: pushl %eax
1266: movb $0x20,%al # EOI (asm in strings loses cpp features)
1267: outb %al,$0xa0 # IO_ICU2
1268: outb %al,$0x20 # IO_ICU1
1269: movb $0,%al
1270: outb %al,$0xf0 # clear BUSY# latch
1271: popl %eax
1272: iret
1.72 yamt 1273: END(probeintr)
1.1 fvdl 1274:
1.48 yamt 1275: /*
1276: * void probetrap(void)
1277: */
1.1 fvdl 1278: NENTRY(probetrap)
1279: ss
1280: incl _C_LABEL(npx_traps_while_probing)
1281: fnclex
1282: iret
1.72 yamt 1283: END(probetrap)
1.1 fvdl 1284:
1.48 yamt 1285: /*
1286: * int npx586bug1(int a, int b)
1287: */
1.1 fvdl 1288: NENTRY(npx586bug1)
1289: fildl 4(%esp) # x
1290: fildl 8(%esp) # y
1291: fld %st(1)
1292: fdiv %st(1),%st # x/y
1293: fmulp %st,%st(1) # (x/y)*y
1294: fsubrp %st,%st(1) # x-(x/y)*y
1295: pushl $0
1296: fistpl (%esp)
1297: popl %eax
1298: ret
1.72 yamt 1299: END(npx586bug1)
1.1 fvdl 1300: #endif /* NNPX > 0 */
1.50 ad 1301:
1302: /*
1.76 ad 1303: * void sse2_idlezero_page(void *pg)
1.50 ad 1304: *
1.76 ad 1305: * Zero a page without polluting the cache. Preemption must be
1306: * disabled by the caller. Abort if a preemption is pending.
1.50 ad 1307: */
1.76 ad 1308: ENTRY(sse2_idlezero_page)
1.50 ad 1309: pushl %ebp
1310: movl %esp,%ebp
1311: movl 8(%esp), %edx
1.76 ad 1312: movl $(PAGE_SIZE/32), %ecx
1.50 ad 1313: xorl %eax, %eax
1314: .align 16
1315: 1:
1.82 ad 1316: testl $RESCHED_KPREEMPT, CPUVAR(RESCHED)
1.76 ad 1317: jnz 2f
1.50 ad 1318: movnti %eax, 0(%edx)
1319: movnti %eax, 4(%edx)
1320: movnti %eax, 8(%edx)
1321: movnti %eax, 12(%edx)
1322: movnti %eax, 16(%edx)
1323: movnti %eax, 20(%edx)
1324: movnti %eax, 24(%edx)
1325: movnti %eax, 28(%edx)
1.76 ad 1326: addl $32, %edx
1.75 ad 1327: decl %ecx
1.50 ad 1328: jnz 1b
1329: sfence
1.76 ad 1330: incl %eax
1.50 ad 1331: pop %ebp
1332: ret
1.76 ad 1333: 2:
1.50 ad 1334: sfence
1335: popl %ebp
1336: ret
1.76 ad 1337: END(sse2_idlezero_page)
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