Annotation of src/sys/arch/i386/i386/locore.S, Revision 1.152
1.152 ! maxv 1: /* $NetBSD: locore.S,v 1.151 2017/08/12 07:21:57 maxv Exp $ */
1.53 yamt 2:
3: /*
4: * Copyright-o-rama!
5: */
6:
7: /*
1.127 maxv 8: * Copyright (c) 1998, 2000, 2004, 2006, 2007, 2009, 2016
9: * The NetBSD Foundation, Inc., All rights reserved.
10: *
11: * This code is derived from software contributed to The NetBSD Foundation
12: * by Charles M. Hannum, by Andrew Doran and by Maxime Villard.
13: *
14: * Redistribution and use in source and binary forms, with or without
15: * modification, are permitted provided that the following conditions
16: * are met:
17: * 1. Redistributions of source code must retain the above copyright
18: * notice, this list of conditions and the following disclaimer.
19: * 2. Redistributions in binary form must reproduce the above copyright
20: * notice, this list of conditions and the following disclaimer in the
21: * documentation and/or other materials provided with the distribution.
22: *
23: * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
24: * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
25: * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
26: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
27: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
30: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
31: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
32: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
33: * POSSIBILITY OF SUCH DAMAGE.
34: */
35:
36: /*
1.62 bouyer 37: * Copyright (c) 2006 Manuel Bouyer.
38: *
39: * Redistribution and use in source and binary forms, with or without
40: * modification, are permitted provided that the following conditions
41: * are met:
42: * 1. Redistributions of source code must retain the above copyright
43: * notice, this list of conditions and the following disclaimer.
44: * 2. Redistributions in binary form must reproduce the above copyright
45: * notice, this list of conditions and the following disclaimer in the
46: * documentation and/or other materials provided with the distribution.
47: *
48: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
49: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
50: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
51: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
52: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
53: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
54: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
55: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
56: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
57: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
58: *
59: */
60:
61: /*
1.53 yamt 62: * Copyright (c) 2001 Wasabi Systems, Inc.
63: * All rights reserved.
64: *
65: * Written by Frank van der Linden for Wasabi Systems, Inc.
66: *
67: * Redistribution and use in source and binary forms, with or without
68: * modification, are permitted provided that the following conditions
69: * are met:
70: * 1. Redistributions of source code must retain the above copyright
71: * notice, this list of conditions and the following disclaimer.
72: * 2. Redistributions in binary form must reproduce the above copyright
73: * notice, this list of conditions and the following disclaimer in the
74: * documentation and/or other materials provided with the distribution.
75: * 3. All advertising materials mentioning features or use of this software
76: * must display the following acknowledgement:
77: * This product includes software developed for the NetBSD Project by
78: * Wasabi Systems, Inc.
79: * 4. The name of Wasabi Systems, Inc. may not be used to endorse
80: * or promote products derived from this software without specific prior
81: * written permission.
82: *
83: * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
84: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
85: * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
86: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
87: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
88: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
89: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
90: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
91: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
92: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
93: * POSSIBILITY OF SUCH DAMAGE.
94: */
95:
1.1 fvdl 96: /*-
97: * Copyright (c) 1990 The Regents of the University of California.
98: * All rights reserved.
99: *
100: * This code is derived from software contributed to Berkeley by
101: * William Jolitz.
102: *
103: * Redistribution and use in source and binary forms, with or without
104: * modification, are permitted provided that the following conditions
105: * are met:
106: * 1. Redistributions of source code must retain the above copyright
107: * notice, this list of conditions and the following disclaimer.
108: * 2. Redistributions in binary form must reproduce the above copyright
109: * notice, this list of conditions and the following disclaimer in the
110: * documentation and/or other materials provided with the distribution.
1.12 agc 111: * 3. Neither the name of the University nor the names of its contributors
1.1 fvdl 112: * may be used to endorse or promote products derived from this software
113: * without specific prior written permission.
114: *
115: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
116: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
117: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
118: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
119: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
120: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
121: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
122: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
123: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
124: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
125: * SUCH DAMAGE.
126: *
127: * @(#)locore.s 7.3 (Berkeley) 5/13/91
128: */
129:
1.59 lukem 130: #include <machine/asm.h>
1.152 ! maxv 131: __KERNEL_RCSID(0, "$NetBSD: locore.S,v 1.151 2017/08/12 07:21:57 maxv Exp $");
1.59 lukem 132:
1.114 uebayasi 133: #include "opt_copy_symtab.h"
1.1 fvdl 134: #include "opt_ddb.h"
1.83 apb 135: #include "opt_modular.h"
1.78 joerg 136: #include "opt_multiboot.h"
1.1 fvdl 137: #include "opt_realmem.h"
1.62 bouyer 138: #include "opt_xen.h"
1.1 fvdl 139:
140: #include "assym.h"
141: #include "lapic.h"
142: #include "ioapic.h"
1.8 fvdl 143: #include "ksyms.h"
1.1 fvdl 144:
145: #include <sys/errno.h>
146: #include <sys/syscall.h>
147:
148: #include <machine/segments.h>
149: #include <machine/specialreg.h>
150: #include <machine/trap.h>
151: #include <machine/i82489reg.h>
1.48 yamt 152: #include <machine/frameasm.h>
153: #include <machine/i82489reg.h>
1.127 maxv 154: #include <machine/cputypes.h>
155:
1.62 bouyer 156: #ifndef XEN
157: #include <machine/multiboot.h>
158: #endif
1.1 fvdl 159:
160: /* Get definitions for IOM_BEGIN, IOM_END, and IOM_SIZE */
161: #include <dev/isa/isareg.h>
162:
1.104 uebayasi 163: #ifndef XEN
164: #define _RELOC(x) ((x) - KERNBASE)
165: #else
166: #define _RELOC(x) ((x))
167: #endif /* XEN */
168: #define RELOC(x) _RELOC(_C_LABEL(x))
169:
1.119 maxv 170: /* 32bit version of PG_NX */
171: #define PG_NX32 0x80000000
172:
1.115 maxv 173: #ifndef PAE
174: #define PROC0_PDIR_OFF 0
175: #else
176: #define PROC0_L3_OFF 0
177: #define PROC0_PDIR_OFF 1 * PAGE_SIZE
178: #endif
179:
180: #define PROC0_STK_OFF (PROC0_PDIR_OFF + PDP_SIZE * PAGE_SIZE)
181: #define PROC0_PTP1_OFF (PROC0_STK_OFF + UPAGES * PAGE_SIZE)
182:
183: /*
184: * fillkpt - Fill in a kernel page table
185: * eax = pte (page frame | control | status)
186: * ebx = page table address
187: * ecx = number of pages to map
188: *
189: * For PAE, each entry is 8 bytes long: we must set the 4 upper bytes to 0.
190: * This is done by the first instruction of fillkpt. In the non-PAE case, this
191: * instruction just clears the page table entry.
192: */
193: #define fillkpt \
1.125 maxv 194: cmpl $0,%ecx ; /* zero-sized? */ \
195: je 2f ; \
1.115 maxv 196: 1: movl $0,(PDE_SIZE-4)(%ebx) ; /* upper 32 bits: 0 */ \
197: movl %eax,(%ebx) ; /* store phys addr */ \
198: addl $PDE_SIZE,%ebx ; /* next PTE/PDE */ \
199: addl $PAGE_SIZE,%eax ; /* next phys page */ \
1.125 maxv 200: loop 1b ; \
201: 2: ;
1.115 maxv 202:
1.118 maxv 203: /*
1.120 maxv 204: * fillkpt_nox - Same as fillkpt, but sets the NX/XD bit.
205: */
206: #define fillkpt_nox \
1.125 maxv 207: cmpl $0,%ecx ; /* zero-sized? */ \
208: je 2f ; \
1.120 maxv 209: pushl %ebp ; \
210: movl RELOC(nox_flag),%ebp ; \
211: 1: movl %ebp,(PDE_SIZE-4)(%ebx) ; /* upper 32 bits: NX */ \
212: movl %eax,(%ebx) ; /* store phys addr */ \
213: addl $PDE_SIZE,%ebx ; /* next PTE/PDE */ \
214: addl $PAGE_SIZE,%eax ; /* next phys page */ \
215: loop 1b ; \
1.125 maxv 216: popl %ebp ; \
217: 2: ;
1.120 maxv 218:
219: /*
1.129 maxv 220: * fillkpt_blank - Fill in a kernel page table with blank entries
221: * ebx = page table address
222: * ecx = number of pages to map
223: */
224: #define fillkpt_blank \
225: cmpl $0,%ecx ; /* zero-sized? */ \
226: je 2f ; \
227: 1: movl $0,(PDE_SIZE-4)(%ebx) ; /* upper 32 bits: 0 */ \
228: movl $0,(%ebx) ; /* lower 32 bits: 0 */ \
229: addl $PDE_SIZE,%ebx ; /* next PTE/PDE */ \
230: loop 1b ; \
231: 2: ;
232:
233: /*
1.118 maxv 234: * killkpt - Destroy a kernel page table
235: * ebx = page table address
236: * ecx = number of pages to destroy
237: */
238: #define killkpt \
239: 1: movl $0,(PDE_SIZE-4)(%ebx) ; /* upper bits (for PAE) */ \
240: movl $0,(%ebx) ; \
241: addl $PDE_SIZE,%ebx ; \
242: loop 1b ;
243:
1.115 maxv 244:
1.62 bouyer 245: #ifdef XEN
246: /*
247: * Xen guest identifier and loader selection
248: */
249: .section __xen_guest
250: .ascii "GUEST_OS=netbsd,GUEST_VER=3.0,XEN_VER=xen-3.0"
1.106 uebayasi 251: .ascii ",VIRT_BASE=0xc0000000" /* KERNBASE */
252: .ascii ",ELF_PADDR_OFFSET=0xc0000000" /* KERNBASE */
253: .ascii ",VIRT_ENTRY=0xc0100000" /* KERNTEXTOFF */
254: .ascii ",HYPERCALL_PAGE=0x00000101"
1.62 bouyer 255: /* (???+HYPERCALL_PAGE_OFFSET)/PAGE_SIZE) */
1.66 bouyer 256: #ifdef PAE
1.106 uebayasi 257: .ascii ",PAE=yes[extended-cr3]"
1.66 bouyer 258: #endif
1.62 bouyer 259: .ascii ",LOADER=generic"
1.114 uebayasi 260: #if (NKSYMS || defined(DDB) || defined(MODULAR)) && !defined(makeoptions_COPY_SYMTAB)
1.62 bouyer 261: .ascii ",BSD_SYMTAB=yes"
262: #endif
263: .byte 0
1.106 uebayasi 264: #endif /* XEN */
1.62 bouyer 265:
1.1 fvdl 266: /*
267: * Initialization
268: */
269: .data
270:
1.127 maxv 271: .globl _C_LABEL(tablesize)
272: .globl _C_LABEL(nox_flag)
273: .globl _C_LABEL(cputype)
274: .globl _C_LABEL(cpuid_level)
275: .globl _C_LABEL(esym)
276: .globl _C_LABEL(eblob)
277: .globl _C_LABEL(atdevbase)
278: .globl _C_LABEL(PDPpaddr)
279: .globl _C_LABEL(lwp0uarea)
280: .globl _C_LABEL(gdt)
281: .globl _C_LABEL(idt)
282:
1.126 maxv 283: .type _C_LABEL(tablesize), @object
284: _C_LABEL(tablesize): .long 0
285: END(tablesize)
1.119 maxv 286: .type _C_LABEL(nox_flag), @object
287: LABEL(nox_flag) .long 0 /* 32bit NOX flag, set if supported */
288: END(nox_flag)
1.104 uebayasi 289: .type _C_LABEL(cputype), @object
1.115 maxv 290: LABEL(cputype) .long 0 /* are we 80486, Pentium, or.. */
1.104 uebayasi 291: END(cputype)
292: .type _C_LABEL(cpuid_level), @object
1.128 maxv 293: LABEL(cpuid_level) .long -1 /* max. level accepted by cpuid instr */
1.104 uebayasi 294: END(cpuid_level)
295: .type _C_LABEL(atdevbase), @object
1.115 maxv 296: LABEL(atdevbase) .long 0 /* location of start of iomem in virt */
1.104 uebayasi 297: END(atdevbase)
298: .type _C_LABEL(lwp0uarea), @object
299: LABEL(lwp0uarea) .long 0
300: END(lwp0uarea)
301: .type _C_LABEL(PDPpaddr), @object
1.115 maxv 302: LABEL(PDPpaddr) .long 0 /* paddr of PDP, for libkvm */
1.104 uebayasi 303: END(PDPpaddr)
1.115 maxv 304:
305: /* Space for the temporary stack */
1.104 uebayasi 306: .size tmpstk, tmpstk - .
1.115 maxv 307: .space 512
1.1 fvdl 308: tmpstk:
1.96 cherry 309: #ifdef XEN
1.115 maxv 310: .align PAGE_SIZE, 0x0 /* Align on page boundary */
1.104 uebayasi 311: LABEL(tmpgdt)
1.115 maxv 312: .space PAGE_SIZE /* Xen expects a page */
1.104 uebayasi 313: END(tmpgdt)
1.96 cherry 314: #endif /* XEN */
1.1 fvdl 315:
316: .text
317: .globl _C_LABEL(kernel_text)
318: .set _C_LABEL(kernel_text),KERNTEXTOFF
319:
1.104 uebayasi 320: ENTRY(start)
1.62 bouyer 321: #ifndef XEN
1.115 maxv 322:
323: /* Warm boot */
324: movw $0x1234,0x472
325:
1.37 jmmv 326: #if defined(MULTIBOOT)
327: jmp 1f
328:
329: .align 4
330: .globl Multiboot_Header
331: _C_LABEL(Multiboot_Header):
1.44 jmmv 332: #define MULTIBOOT_HEADER_FLAGS (MULTIBOOT_HEADER_WANT_MEMORY)
1.37 jmmv 333: .long MULTIBOOT_HEADER_MAGIC
334: .long MULTIBOOT_HEADER_FLAGS
335: .long -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS)
336:
337: 1:
338: /* Check if we are being executed by a Multiboot-compliant boot
339: * loader. */
340: cmpl $MULTIBOOT_INFO_MAGIC,%eax
341: jne 1f
342:
1.43 mrg 343: /*
1.150 maxv 344: * Indeed, a multiboot-compliant boot loader executed us. We switch
345: * to the temporary stack, and copy the received Multiboot information
346: * structure into kernel's data space to process it later -- after we
347: * are relocated. It will be safer to run complex C code than doing it
348: * at this point.
1.43 mrg 349: */
1.150 maxv 350: movl $_RELOC(tmpstk),%esp
1.115 maxv 351: pushl %ebx /* Address of Multiboot information */
1.37 jmmv 352: call _C_LABEL(multiboot_pre_reloc)
353: addl $4,%esp
1.38 jmmv 354: jmp 2f
1.37 jmmv 355: #endif
356:
357: 1:
1.1 fvdl 358: /*
1.38 jmmv 359: * At this point, we know that a NetBSD-specific boot loader
1.117 maxv 360: * booted this kernel.
361: *
362: * Load parameters from the stack (32 bits):
363: * boothowto, [bootdev], bootinfo, esym, biosextmem, biosbasemem
364: * We are not interested in 'bootdev'.
1.1 fvdl 365: */
1.117 maxv 366:
1.115 maxv 367: addl $4,%esp /* Discard return address to boot loader */
1.38 jmmv 368: call _C_LABEL(native_loader)
369: addl $24,%esp
1.1 fvdl 370:
371: 2:
372: /* First, reset the PSL. */
373: pushl $PSL_MBO
374: popfl
375:
376: /* Clear segment registers; always null in proc0. */
377: xorl %eax,%eax
378: movw %ax,%fs
379: movw %ax,%gs
380:
381: /* Find out our CPU type. */
382:
383: try386: /* Try to toggle alignment check flag; does not exist on 386. */
384: pushfl
385: popl %eax
386: movl %eax,%ecx
387: orl $PSL_AC,%eax
388: pushl %eax
389: popfl
390: pushfl
391: popl %eax
392: xorl %ecx,%eax
393: andl $PSL_AC,%eax
394: pushl %ecx
395: popfl
396:
397: testl %eax,%eax
398: jnz try486
399:
400: /*
401: * Try the test of a NexGen CPU -- ZF will not change on a DIV
402: * instruction on a NexGen, it will on an i386. Documented in
403: * Nx586 Processor Recognition Application Note, NexGen, Inc.
404: */
405: movl $0x5555,%eax
406: xorl %edx,%edx
407: movl $2,%ecx
408: divl %ecx
409: jnz is386
410:
411: isnx586:
412: /*
413: * Don't try cpuid, as Nx586s reportedly don't support the
414: * PSL_ID bit.
415: */
1.100 chs 416: movl $CPU_NX586,RELOC(cputype)
1.1 fvdl 417: jmp 2f
418:
419: is386:
1.100 chs 420: movl $CPU_386,RELOC(cputype)
1.1 fvdl 421: jmp 2f
422:
423: try486: /* Try to toggle identification flag; does not exist on early 486s. */
424: pushfl
425: popl %eax
426: movl %eax,%ecx
427: xorl $PSL_ID,%eax
428: pushl %eax
429: popfl
430: pushfl
431: popl %eax
432: xorl %ecx,%eax
433: andl $PSL_ID,%eax
434: pushl %ecx
435: popfl
436:
437: testl %eax,%eax
438: jnz try586
1.100 chs 439: is486: movl $CPU_486,RELOC(cputype)
1.1 fvdl 440: /*
441: * Check Cyrix CPU
442: * Cyrix CPUs do not change the undefined flags following
443: * execution of the divide instruction which divides 5 by 2.
444: *
445: * Note: CPUID is enabled on M2, so it passes another way.
446: */
447: pushfl
448: movl $0x5555, %eax
449: xorl %edx, %edx
450: movl $2, %ecx
451: clc
452: divl %ecx
453: jnc trycyrix486
454: popfl
455: jmp 2f
456: trycyrix486:
1.115 maxv 457: movl $CPU_6x86,RELOC(cputype) /* set CPU type */
1.1 fvdl 458: /*
459: * Check for Cyrix 486 CPU by seeing if the flags change during a
460: * divide. This is documented in the Cx486SLC/e SMM Programmer's
461: * Guide.
462: */
463: xorl %edx,%edx
1.115 maxv 464: cmpl %edx,%edx /* set flags to known state */
1.1 fvdl 465: pushfl
1.115 maxv 466: popl %ecx /* store flags in ecx */
1.1 fvdl 467: movl $-1,%eax
468: movl $4,%ebx
1.115 maxv 469: divl %ebx /* do a long division */
1.1 fvdl 470: pushfl
471: popl %eax
1.115 maxv 472: xorl %ecx,%eax /* are the flags different? */
473: testl $0x8d5,%eax /* only check C|PF|AF|Z|N|V */
474: jne 2f /* yes; must be Cyrix 6x86 CPU */
475: movl $CPU_486DLC,RELOC(cputype) /* set CPU type */
1.1 fvdl 476:
477: #ifndef CYRIX_CACHE_WORKS
478: /* Disable caching of the ISA hole only. */
479: invd
1.115 maxv 480: movb $CCR0,%al /* Configuration Register index (CCR0) */
1.1 fvdl 481: outb %al,$0x22
482: inb $0x23,%al
483: orb $(CCR0_NC1|CCR0_BARB),%al
484: movb %al,%ah
485: movb $CCR0,%al
486: outb %al,$0x22
487: movb %ah,%al
488: outb %al,$0x23
489: invd
490: #else /* CYRIX_CACHE_WORKS */
491: /* Set cache parameters */
1.115 maxv 492: invd /* Start with guaranteed clean cache */
493: movb $CCR0,%al /* Configuration Register index (CCR0) */
1.1 fvdl 494: outb %al,$0x22
495: inb $0x23,%al
496: andb $~CCR0_NC0,%al
497: #ifndef CYRIX_CACHE_REALLY_WORKS
498: orb $(CCR0_NC1|CCR0_BARB),%al
499: #else
500: orb $CCR0_NC1,%al
501: #endif
502: movb %al,%ah
503: movb $CCR0,%al
504: outb %al,$0x22
505: movb %ah,%al
506: outb %al,$0x23
507: /* clear non-cacheable region 1 */
508: movb $(NCR1+2),%al
509: outb %al,$0x22
510: movb $NCR_SIZE_0K,%al
511: outb %al,$0x23
512: /* clear non-cacheable region 2 */
513: movb $(NCR2+2),%al
514: outb %al,$0x22
515: movb $NCR_SIZE_0K,%al
516: outb %al,$0x23
517: /* clear non-cacheable region 3 */
518: movb $(NCR3+2),%al
519: outb %al,$0x22
520: movb $NCR_SIZE_0K,%al
521: outb %al,$0x23
522: /* clear non-cacheable region 4 */
523: movb $(NCR4+2),%al
524: outb %al,$0x22
525: movb $NCR_SIZE_0K,%al
526: outb %al,$0x23
527: /* enable caching in CR0 */
528: movl %cr0,%eax
529: andl $~(CR0_CD|CR0_NW),%eax
530: movl %eax,%cr0
531: invd
532: #endif /* CYRIX_CACHE_WORKS */
533:
534: jmp 2f
535:
536: try586: /* Use the `cpuid' instruction. */
537: xorl %eax,%eax
538: cpuid
1.73 ad 539: movl %eax,RELOC(cpuid_level)
1.1 fvdl 540:
1.122 maxv 541: /*
542: * Retrieve the NX/XD flag. We use the 32bit version of PG_NX.
543: */
544: movl $0x80000001,%eax
545: cpuid
546: andl $CPUID_NOX,%edx
547: jz no_NOX
548: movl $PG_NX32,RELOC(nox_flag)
549: no_NOX:
550:
1.1 fvdl 551: 2:
552: /*
553: * Finished with old stack; load new %esp now instead of later so we
554: * can trace this code without having to worry about the trace trap
555: * clobbering the memory test or the zeroing of the bss+bootstrap page
556: * tables.
557: *
558: * The boot program should check:
559: * text+data <= &stack_variable - more_space_for_stack
560: * text+data+bss+pad+space_for_page_tables <= end_of_memory
1.115 maxv 561: *
562: * XXX: the gdt is in the carcass of the boot program so clearing
1.1 fvdl 563: * the rest of memory is still not possible.
564: */
1.115 maxv 565: movl $_RELOC(tmpstk),%esp
1.1 fvdl 566:
567: /*
1.117 maxv 568: * There are two different layouts possible, depending on whether PAE is
569: * enabled or not.
1.1 fvdl 570: *
1.117 maxv 571: * If PAE is not enabled, there are two levels of pages: PD -> PT. They will
572: * be referred to as: L2 -> L1. L2 is 1 page long. The BOOTSTRAP TABLES have
573: * the following layout:
574: * +-----+------------+----+
575: * | L2 -> PROC0 STK -> L1 |
576: * +-----+------------+----+
577: *
578: * If PAE is enabled, there are three levels of pages: PDP -> PD -> PT. They
579: * will be referred to as: L3 -> L2 -> L1. L3 is 1 page long, L2 is 4 page
580: * long. The BOOTSTRAP TABLES have the following layout:
581: * +-----+-----+------------+----+
582: * | L3 -> L2 -> PROC0 STK -> L1 |
583: * +-----+-----+------------+----+
584: *
585: * Virtual address space of the kernel in both cases:
586: * +------+--------+------+-----+--------+---------------------+-----------
587: * | TEXT | RODATA | DATA | BSS | [SYMS] | [PRELOADED MODULES] | BOOTSTRAP
588: * +------+--------+------+-----+--------+---------------------+-----------
589: * (1) (2) (3)
590: *
1.130 maxv 591: * -------+-------------+
592: * TABLES | ISA I/O MEM |
593: * -------+-------------+
1.117 maxv 594: * (4)
1.93 jym 595: *
1.117 maxv 596: * PROC0 STK is obviously not linked as a page level. It just happens to be
597: * caught between L2 and L1.
1.123 maxv 598: *
599: * Important note: the kernel segments are properly 4k-aligned
600: * (see kern.ldscript), so there's no need to enforce alignment.
1.1 fvdl 601: */
602:
1.117 maxv 603: /* Find end of kernel image; brings us on (1). */
1.142 maxv 604: movl $RELOC(__kernel_end),%edi
1.71 ad 605:
1.114 uebayasi 606: #if (NKSYMS || defined(DDB) || defined(MODULAR)) && !defined(makeoptions_COPY_SYMTAB)
1.117 maxv 607: /* Save the symbols (if loaded); brinds us on (2). */
1.1 fvdl 608: movl RELOC(esym),%eax
609: testl %eax,%eax
610: jz 1f
1.35 yamt 611: subl $KERNBASE,%eax
1.1 fvdl 612: movl %eax,%edi
613: 1:
614: #endif
615:
1.117 maxv 616: /* Skip over any modules/blobs; brings us on (3). */
1.71 ad 617: movl RELOC(eblob),%eax
618: testl %eax,%eax
619: jz 1f
620: subl $KERNBASE,%eax
621: movl %eax,%edi
622: 1:
1.117 maxv 623:
624: /* We are on (3). Align up for BOOTSTRAP TABLES. */
1.71 ad 625: movl %edi,%esi
1.115 maxv 626: addl $PGOFSET,%esi
1.1 fvdl 627: andl $~PGOFSET,%esi
628:
1.53 yamt 629: /* nkptp[1] = (esi + ~L2_FRAME) >> L2_SHIFT + 1; */
630: movl %esi,%eax
631: addl $~L2_FRAME,%eax
632: shrl $L2_SHIFT,%eax
1.117 maxv 633: incl %eax /* one more PTP for VAs stolen by bootstrap */
1.53 yamt 634: 1: movl %eax,RELOC(nkptp)+1*4
635:
1.144 maxv 636: /* tablesize = (PDP_SIZE + UPAGES + nkptp[1]) << PGSHIFT; */
1.93 jym 637: addl $(PDP_SIZE+UPAGES),%eax
638: #ifdef PAE
1.117 maxv 639: incl %eax /* one more page for L3 */
1.93 jym 640: shll $PGSHIFT+1,%eax /* PTP tables are twice larger with PAE */
641: #else
1.53 yamt 642: shll $PGSHIFT,%eax
1.93 jym 643: #endif
1.53 yamt 644: movl %eax,RELOC(tablesize)
645:
1.144 maxv 646: /* Ensure that nkptp[1] covers BOOTSTRAP TABLES, ie:
647: * (esi + tablesize) >> L2_SHIFT + 1 < nkptp[1] */
1.53 yamt 648: addl %esi,%eax
649: addl $~L2_FRAME,%eax
650: shrl $L2_SHIFT,%eax
651: incl %eax
652: cmpl %eax,RELOC(nkptp)+1*4
653: jnz 1b
654:
1.117 maxv 655: /* Now, zero out the BOOTSTRAP TABLES (before filling them in). */
1.105 uebayasi 656: movl %esi,%edi
1.1 fvdl 657: xorl %eax,%eax
658: cld
1.105 uebayasi 659: movl RELOC(tablesize),%ecx
660: shrl $2,%ecx
1.1 fvdl 661: rep
1.117 maxv 662: stosl /* copy eax -> edi */
1.1 fvdl 663:
664: /*
1.117 maxv 665: * Build the page tables and levels. We go from L1 to L2/L3, and link the levels
666: * together. Note: RELOC computes &addr - KERNBASE in 32 bits; the value can't
667: * be > 4G, or we can't deal with it anyway, since we are in 32bit mode.
1.1 fvdl 668: */
1.105 uebayasi 669: /*
1.117 maxv 670: * Build L1.
1.105 uebayasi 671: */
1.117 maxv 672: leal (PROC0_PTP1_OFF)(%esi),%ebx
673:
1.145 maxv 674: /* Skip the area below the kernel text. */
1.129 maxv 675: movl $(KERNTEXTOFF - KERNBASE),%ecx
676: shrl $PGSHIFT,%ecx
677: fillkpt_blank
1.1 fvdl 678:
1.121 maxv 679: /* Map the kernel text RX. */
1.129 maxv 680: movl $(KERNTEXTOFF - KERNBASE),%eax /* start of TEXT */
1.121 maxv 681: movl $RELOC(__rodata_start),%ecx
1.1 fvdl 682: subl %eax,%ecx
683: shrl $PGSHIFT,%ecx
684: orl $(PG_V|PG_KR),%eax
685: fillkpt
686:
1.121 maxv 687: /* Map the kernel rodata R. */
688: movl $RELOC(__rodata_start),%eax
689: movl $RELOC(__data_start),%ecx
690: subl %eax,%ecx
691: shrl $PGSHIFT,%ecx
692: orl $(PG_V|PG_KR),%eax
693: fillkpt_nox
694:
695: /* Map the kernel data+bss RW. */
696: movl $RELOC(__data_start),%eax
697: movl $RELOC(__kernel_end),%ecx
698: subl %eax,%ecx
1.1 fvdl 699: shrl $PGSHIFT,%ecx
1.121 maxv 700: orl $(PG_V|PG_KW),%eax
701: fillkpt_nox
702:
1.134 maxv 703: /* Map [SYMS]+[PRELOADED MODULES] RW. */
1.121 maxv 704: movl $RELOC(__kernel_end),%eax
705: movl %esi,%ecx /* start of BOOTSTRAP TABLES */
1.124 maxv 706: subl %eax,%ecx
1.121 maxv 707: shrl $PGSHIFT,%ecx
708: orl $(PG_V|PG_KW),%eax
1.134 maxv 709: fillkpt_nox
1.1 fvdl 710:
1.124 maxv 711: /* Map the BOOTSTRAP TABLES RW. */
712: movl %esi,%eax /* start of BOOTSTRAP TABLES */
713: movl RELOC(tablesize),%ecx /* length of BOOTSTRAP TABLES */
714: shrl $PGSHIFT,%ecx
715: orl $(PG_V|PG_KW),%eax
716: fillkpt_nox
717:
1.131 maxv 718: /* We are on (4). Map ISA I/O MEM RW. */
1.130 maxv 719: movl $IOM_BEGIN,%eax
720: movl $IOM_SIZE,%ecx /* size of ISA I/O MEM */
721: shrl $PGSHIFT,%ecx
722: orl $(PG_V|PG_KW/*|PG_N*/),%eax
1.131 maxv 723: fillkpt_nox
1.1 fvdl 724:
1.117 maxv 725: /*
726: * Build L2 for identity mapping. Linked to L1.
727: */
1.105 uebayasi 728: leal (PROC0_PDIR_OFF)(%esi),%ebx
729: leal (PROC0_PTP1_OFF)(%esi),%eax
1.117 maxv 730: orl $(PG_V|PG_KW),%eax
1.105 uebayasi 731: movl RELOC(nkptp)+1*4,%ecx
1.1 fvdl 732: fillkpt
733:
1.117 maxv 734: /* Set up L2 entries for actual kernel mapping */
735: leal (PROC0_PDIR_OFF + L2_SLOT_KERNBASE * PDE_SIZE)(%esi),%ebx
1.105 uebayasi 736: leal (PROC0_PTP1_OFF)(%esi),%eax
1.117 maxv 737: orl $(PG_V|PG_KW),%eax
1.105 uebayasi 738: movl RELOC(nkptp)+1*4,%ecx
1.1 fvdl 739: fillkpt
740:
1.135 maxv 741: /* Install recursive top level PDE */
1.117 maxv 742: leal (PROC0_PDIR_OFF + PDIR_SLOT_PTE * PDE_SIZE)(%esi),%ebx
1.105 uebayasi 743: leal (PROC0_PDIR_OFF)(%esi),%eax
744: orl $(PG_V|PG_KW),%eax
1.93 jym 745: movl $PDP_SIZE,%ecx
1.135 maxv 746: fillkpt_nox
1.93 jym 747:
748: #ifdef PAE
1.117 maxv 749: /*
750: * Build L3. Linked to L2.
751: */
1.93 jym 752: leal (PROC0_L3_OFF)(%esi),%ebx
753: leal (PROC0_PDIR_OFF)(%esi),%eax
754: orl $(PG_V),%eax
755: movl $PDP_SIZE,%ecx
756: fillkpt
757:
758: /* Enable PAE mode */
759: movl %cr4,%eax
760: orl $CR4_PAE,%eax
761: movl %eax,%cr4
762: #endif
1.1 fvdl 763:
1.117 maxv 764: /* Save physical address of L2. */
1.93 jym 765: leal (PROC0_PDIR_OFF)(%esi),%eax
766: movl %eax,RELOC(PDPpaddr)
1.1 fvdl 767:
1.93 jym 768: /*
769: * Startup checklist:
1.117 maxv 770: * 1. Load %cr3 with pointer to L2 (or L3 for PAE).
1.93 jym 771: */
1.117 maxv 772: movl %esi,%eax
773: movl %eax,%cr3
1.93 jym 774:
1.105 uebayasi 775: /*
1.119 maxv 776: * 2. Set NOX in EFER, if available.
777: */
778: movl RELOC(nox_flag),%ebx
779: cmpl $0,%ebx
780: je skip_NOX
781: movl $MSR_EFER,%ecx
782: rdmsr
783: xorl %eax,%eax
784: orl $(EFER_NXE),%eax
785: wrmsr
786: skip_NOX:
787:
788: /*
789: * 3. Enable paging and the rest of it.
1.105 uebayasi 790: */
1.115 maxv 791: movl %cr0,%eax
1.111 dsl 792: orl $(CR0_PE|CR0_PG|CR0_NE|CR0_TS|CR0_MP|CR0_WP|CR0_AM),%eax
1.115 maxv 793: movl %eax,%cr0
1.1 fvdl 794:
1.115 maxv 795: pushl $begin /* jump to high mem */
1.1 fvdl 796: ret
797:
798: begin:
1.105 uebayasi 799: /*
1.117 maxv 800: * We have arrived. There's no need anymore for the identity mapping in
801: * low memory, remove it.
1.105 uebayasi 802: */
803: movl _C_LABEL(nkptp)+1*4,%ecx
1.115 maxv 804: leal (PROC0_PDIR_OFF)(%esi),%ebx /* old, phys address of PDIR */
805: addl $(KERNBASE), %ebx /* new, virt address of PDIR */
1.118 maxv 806: killkpt
1.1 fvdl 807:
808: /* Relocate atdevbase. */
1.53 yamt 809: movl $KERNBASE,%edx
810: addl _C_LABEL(tablesize),%edx
1.1 fvdl 811: addl %esi,%edx
812: movl %edx,_C_LABEL(atdevbase)
813:
814: /* Set up bootstrap stack. */
1.105 uebayasi 815: leal (PROC0_STK_OFF+KERNBASE)(%esi),%eax
1.91 rmind 816: movl %eax,_C_LABEL(lwp0uarea)
1.112 dsl 817: leal (USPACE-FRAMESIZE)(%eax),%esp
1.115 maxv 818: movl %esi,PCB_CR3(%eax) /* pcb->pcb_cr3 */
819: xorl %ebp,%ebp /* mark end of frames */
1.1 fvdl 820:
1.37 jmmv 821: #if defined(MULTIBOOT)
822: /* It is now safe to parse the Multiboot information structure
823: * we saved before from C code. Note that we cannot delay its
824: * parsing any more because initgdt (called below) needs to make
825: * use of this information. */
826: call _C_LABEL(multiboot_post_reloc)
827: #endif
828:
1.115 maxv 829: subl $NGDT*8, %esp /* space for temporary gdt */
1.1 fvdl 830: pushl %esp
831: call _C_LABEL(initgdt)
832: addl $4,%esp
1.30 junyoung 833:
1.105 uebayasi 834: movl _C_LABEL(tablesize),%eax
1.115 maxv 835: addl %esi,%eax /* skip past stack and page tables */
1.1 fvdl 836:
1.93 jym 837: #ifdef PAE
1.115 maxv 838: pushl $0 /* init386() expects a 64 bits paddr_t with PAE */
1.93 jym 839: #endif
1.1 fvdl 840: pushl %eax
1.139 maxv 841: call _C_LABEL(init386)
1.115 maxv 842: addl $PDE_SIZE,%esp /* pop paddr_t */
843: addl $NGDT*8,%esp /* pop temporary gdt */
1.1 fvdl 844:
845: call _C_LABEL(main)
1.62 bouyer 846: #else /* XEN */
847: /* First, reset the PSL. */
848: pushl $PSL_MBO
849: popfl
850:
851: cld
1.139 maxv 852:
853: /*
854: * Xen info:
855: * - %esp -> stack, *theoretically* the last used page by Xen bootstrap
856: */
857: movl %esp,%ebx
858: movl $_RELOC(tmpstk),%esp
1.62 bouyer 859:
1.106 uebayasi 860: /* Clear BSS. */
1.62 bouyer 861: xorl %eax,%eax
862: movl $RELOC(__bss_start),%edi
863: movl $RELOC(_end),%ecx
864: subl %edi,%ecx
1.139 maxv 865: rep
866: stosb
1.62 bouyer 867:
868: /* Copy the necessary stuff from start_info structure. */
1.105 uebayasi 869: /* We need to copy shared_info early, so that sti/cli work */
1.62 bouyer 870: movl $RELOC(start_info_union),%edi
871: movl $128,%ecx
1.139 maxv 872: rep
873: movsl
1.62 bouyer 874:
1.139 maxv 875: /* Clear segment registers. */
1.62 bouyer 876: xorl %eax,%eax
877: movw %ax,%fs
878: movw %ax,%gs
879:
880: xorl %eax,%eax
881: cpuid
1.73 ad 882: movl %eax,RELOC(cpuid_level)
1.62 bouyer 883:
1.96 cherry 884: /*
1.139 maxv 885: * Use a temporary GDT page. We'll re-add it to uvm(9) once we're done
886: * using it.
1.96 cherry 887: */
1.139 maxv 888: movl $RELOC(tmpgdt),%eax
1.115 maxv 889: pushl %eax /* start of temporary gdt */
1.96 cherry 890: call _C_LABEL(initgdt)
891: addl $4,%esp
892:
1.140 maxv 893: call xen_locore
1.92 jym 894:
1.62 bouyer 895: /*
1.140 maxv 896: * The first VA available is returned by xen_locore in %eax. We
1.139 maxv 897: * use it as the UAREA, and set up the stack here.
1.62 bouyer 898: */
1.139 maxv 899: movl %eax,%esi
900: movl %esi,_C_LABEL(lwp0uarea)
1.112 dsl 901: leal (USPACE-FRAMESIZE)(%eax),%esp
1.115 maxv 902: xorl %ebp,%ebp /* mark end of frames */
1.62 bouyer 903:
1.143 maxv 904: /* Set first_avail after the DUMMY PAGE (see xen_locore). */
905: addl $(USPACE+PAGE_SIZE),%esi
1.139 maxv 906: subl $KERNBASE,%esi /* init386 wants a physical address */
1.92 jym 907:
908: #ifdef PAE
1.115 maxv 909: pushl $0 /* init386() expects a 64 bits paddr_t with PAE */
1.92 jym 910: #endif
1.62 bouyer 911: pushl %esi
1.139 maxv 912: call _C_LABEL(init386)
1.115 maxv 913: addl $PDE_SIZE,%esp /* pop paddr_t */
1.62 bouyer 914: call _C_LABEL(main)
1.106 uebayasi 915: #endif /* XEN */
1.104 uebayasi 916: END(start)
1.62 bouyer 917:
1.101 jym 918: #if defined(XEN)
1.62 bouyer 919: /* space for the hypercall call page */
920: #define HYPERCALL_PAGE_OFFSET 0x1000
921: .org HYPERCALL_PAGE_OFFSET
922: ENTRY(hypercall_page)
923: .skip 0x1000
1.104 uebayasi 924: END(hypercall_page)
1.62 bouyer 925:
926: /*
927: * void lgdt_finish(void);
928: * Finish load a new GDT pointer (do any necessary cleanup).
929: * XXX It's somewhat questionable whether reloading all the segment registers
930: * is necessary, since the actual descriptor data is not changed except by
931: * process creation and exit, both of which clean up via task switches. OTOH,
932: * this only happens at run time when the GDT is resized.
933: */
934: /* LINTSTUB: Func: void lgdt_finish(void) */
935: NENTRY(lgdt_finish)
936: movl $GSEL(GDATA_SEL, SEL_KPL),%eax
937: movw %ax,%ds
938: movw %ax,%es
939: movw %ax,%gs
940: movw %ax,%ss
941: movl $GSEL(GCPU_SEL, SEL_KPL),%eax
942: movw %ax,%fs
943: /* Reload code selector by doing intersegment return. */
944: popl %eax
945: pushl $GSEL(GCODE_SEL, SEL_KPL)
946: pushl %eax
947: lret
1.72 yamt 948: END(lgdt_finish)
1.62 bouyer 949:
950: #endif /* XEN */
1.1 fvdl 951:
952: /*
1.48 yamt 953: * void lwp_trampoline(void);
954: *
1.1 fvdl 955: * This is a trampoline function pushed onto the stack of a newly created
956: * process in order to do some additional setup. The trampoline is entered by
1.109 christos 957: * cpu_switchto()ing to the process, so we abuse the callee-saved
958: * registers used by cpu_switchto() to store the information about the
959: * stub to call.
1.1 fvdl 960: * NOTE: This function does not have a normal calling sequence!
961: */
1.48 yamt 962: NENTRY(lwp_trampoline)
1.68 ad 963: movl %ebp,%edi /* for .Lsyscall_checkast */
1.48 yamt 964: xorl %ebp,%ebp
1.68 ad 965: pushl %edi
1.48 yamt 966: pushl %eax
967: call _C_LABEL(lwp_startup)
968: addl $8,%esp
1.1 fvdl 969: pushl %ebx
970: call *%esi
971: addl $4,%esp
1.68 ad 972: jmp .Lsyscall_checkast
1.1 fvdl 973: /* NOTREACHED */
1.72 yamt 974: END(lwp_trampoline)
1.1 fvdl 975:
976: /*
1.48 yamt 977: * sigcode()
978: *
979: * Signal trampoline; copied to top of user stack. Used only for
980: * compatibility with old releases of NetBSD.
1.1 fvdl 981: */
982: NENTRY(sigcode)
983: /*
984: * Handler has returned here as if we called it. The sigcontext
985: * is on the stack after the 3 args "we" pushed.
986: */
1.115 maxv 987: leal 12(%esp),%eax /* get pointer to sigcontext */
988: movl %eax,4(%esp) /* put it in the argument slot */
989: /* fake return address already there */
1.17 christos 990: movl $SYS_compat_16___sigreturn14,%eax
1.115 maxv 991: int $0x80 /* enter kernel with args on stack */
1.1 fvdl 992: movl $SYS_exit,%eax
1.115 maxv 993: int $0x80 /* exit if sigreturn fails */
1.1 fvdl 994: .globl _C_LABEL(esigcode)
995: _C_LABEL(esigcode):
1.72 yamt 996: END(sigcode)
1.1 fvdl 997:
998: /*
1.48 yamt 999: * int setjmp(label_t *)
1000: *
1001: * Used primarily by DDB.
1.1 fvdl 1002: */
1003: ENTRY(setjmp)
1004: movl 4(%esp),%eax
1.115 maxv 1005: movl %ebx,(%eax) /* save ebx */
1006: movl %esp,4(%eax) /* save esp */
1007: movl %ebp,8(%eax) /* save ebp */
1008: movl %esi,12(%eax) /* save esi */
1009: movl %edi,16(%eax) /* save edi */
1010: movl (%esp),%edx /* get rta */
1011: movl %edx,20(%eax) /* save eip */
1012: xorl %eax,%eax /* return 0 */
1.1 fvdl 1013: ret
1.72 yamt 1014: END(setjmp)
1.1 fvdl 1015:
1.48 yamt 1016: /*
1017: * int longjmp(label_t *)
1018: *
1019: * Used primarily by DDB.
1020: */
1.1 fvdl 1021: ENTRY(longjmp)
1022: movl 4(%esp),%eax
1.115 maxv 1023: movl (%eax),%ebx /* restore ebx */
1024: movl 4(%eax),%esp /* restore esp */
1025: movl 8(%eax),%ebp /* restore ebp */
1026: movl 12(%eax),%esi /* restore esi */
1027: movl 16(%eax),%edi /* restore edi */
1028: movl 20(%eax),%edx /* get rta */
1029: movl %edx,(%esp) /* put in return frame */
1030: movl $1,%eax /* return 1 */
1.1 fvdl 1031: ret
1.72 yamt 1032: END(longjmp)
1.1 fvdl 1033:
1.65 skrll 1034: /*
1035: * void dumpsys(void)
1036: *
1037: * Mimic cpu_switchto() for postmortem debugging.
1038: */
1.64 skrll 1039: ENTRY(dumpsys)
1.115 maxv 1040: pushl %ebx /* set up fake switchframe */
1041: pushl %esi /* and save context */
1042: pushl %edi
1.65 skrll 1043: movl %esp,_C_LABEL(dumppcb)+PCB_ESP
1044: movl %ebp,_C_LABEL(dumppcb)+PCB_EBP
1.115 maxv 1045: call _C_LABEL(dodumpsys) /* dump! */
1046: addl $(3*4), %esp /* unwind switchframe */
1.64 skrll 1047: ret
1.72 yamt 1048: END(dumpsys)
1.64 skrll 1049:
1.1 fvdl 1050: /*
1.106 uebayasi 1051: * struct lwp *cpu_switchto(struct lwp *oldlwp, struct lwp *newlwp,
1.132 maxv 1052: * bool returning)
1.30 junyoung 1053: *
1.48 yamt 1054: * 1. if (oldlwp != NULL), save its context.
1055: * 2. then, restore context of newlwp.
1056: *
1057: * Note that the stack frame layout is known to "struct switchframe" in
1058: * <machine/frame.h> and to the code in cpu_lwp_fork() which initializes
1.5 thorpej 1059: * it for a new lwp.
1.1 fvdl 1060: */
1.48 yamt 1061: ENTRY(cpu_switchto)
1.1 fvdl 1062: pushl %ebx
1063: pushl %esi
1064: pushl %edi
1065:
1.70 ad 1066: #if defined(DIAGNOSTIC) && !defined(XEN)
1067: cmpl $IPL_SCHED,CPUVAR(ILEVEL)
1068: jbe 0f
1.74 christos 1069: pushl CPUVAR(ILEVEL)
1.70 ad 1070: pushl $.Lstr
1071: call _C_LABEL(panic)
1.74 christos 1072: addl $8,%esp
1073: .Lstr: .string "cpu_switchto: switching above IPL_SCHED (%d)\0"
1.70 ad 1074: 0:
1075: #endif
1076:
1.115 maxv 1077: movl 16(%esp),%esi /* oldlwp */
1078: movl 20(%esp),%edi /* newlwp */
1079: movl 24(%esp),%edx /* returning */
1.132 maxv 1080:
1081: testl %esi,%esi /* oldlwp = NULL ? */
1082: jz skip_save
1.1 fvdl 1083:
1.48 yamt 1084: /* Save old context. */
1.91 rmind 1085: movl L_PCB(%esi),%eax
1.48 yamt 1086: movl %esp,PCB_ESP(%eax)
1087: movl %ebp,PCB_EBP(%eax)
1.132 maxv 1088: skip_save:
1.48 yamt 1089:
1090: /* Switch to newlwp's stack. */
1.132 maxv 1091: movl L_PCB(%edi),%ebx
1.48 yamt 1092: movl PCB_EBP(%ebx),%ebp
1093: movl PCB_ESP(%ebx),%esp
1.1 fvdl 1094:
1.61 ad 1095: /*
1096: * Set curlwp. This must be globally visible in order to permit
1097: * non-interlocked mutex release.
1098: */
1099: movl %edi,%ecx
1100: xchgl %ecx,CPUVAR(CURLWP)
1.58 ad 1101:
1102: /* Skip the rest if returning to a pinned LWP. */
1103: testl %edx,%edx
1.132 maxv 1104: jnz switch_return
1.58 ad 1105:
1.132 maxv 1106: /* Switch ring0 stack */
1.62 bouyer 1107: #ifdef XEN
1108: pushl %edi
1109: call _C_LABEL(i386_switch_context)
1110: addl $4,%esp
1.132 maxv 1111: #else
1.60 yamt 1112: movl PCB_ESP0(%ebx),%eax
1113: movl %eax,CPUVAR(ESP0)
1.132 maxv 1114: #endif
1.1 fvdl 1115:
1116: /* Don't bother with the rest if switching to a system process. */
1.48 yamt 1117: testl $LW_SYSTEM,L_FLAG(%edi)
1.132 maxv 1118: jnz switch_return
1.1 fvdl 1119:
1.97 bouyer 1120: #ifndef XEN
1.54 ad 1121: /* Restore thread-private %fs/%gs descriptors. */
1.60 yamt 1122: movl CPUVAR(GDT),%ecx
1.132 maxv 1123: movl PCB_FSD(%ebx),%eax
1124: movl PCB_FSD+4(%ebx),%edx
1125: movl %eax,(GUFS_SEL*8)(%ecx)
1126: movl %edx,(GUFS_SEL*8+4)(%ecx)
1127: movl PCB_GSD(%ebx),%eax
1128: movl PCB_GSD+4(%ebx),%edx
1129: movl %eax,(GUGS_SEL*8)(%ecx)
1130: movl %edx,(GUGS_SEL*8+4)(%ecx)
1.97 bouyer 1131: #endif /* !XEN */
1.54 ad 1132:
1.60 yamt 1133: /* Switch I/O bitmap */
1134: movl PCB_IOMAP(%ebx),%eax
1135: orl %eax,%eax
1.95 joerg 1136: jnz .Lcopy_iobitmap
1.60 yamt 1137: movl $(IOMAP_INVALOFF << 16),CPUVAR(IOBASE)
1138: .Liobitmap_done:
1139:
1.56 ad 1140: /* Is this process using RAS (restartable atomic sequences)? */
1141: movl L_PROC(%edi),%eax
1142: cmpl $0,P_RASLIST(%eax)
1.133 maxv 1143: je no_RAS
1144:
1145: /* Handle restartable atomic sequences (RAS). */
1146: movl L_MD_REGS(%edi),%ecx
1147: pushl TF_EIP(%ecx)
1148: pushl %eax
1149: call _C_LABEL(ras_lookup)
1150: addl $8,%esp
1151: cmpl $-1,%eax
1152: je no_RAS
1153: movl L_MD_REGS(%edi),%ecx
1154: movl %eax,TF_EIP(%ecx)
1155: no_RAS:
1.56 ad 1156:
1.48 yamt 1157: /*
1.90 rmind 1158: * Restore cr0 (including FPU state). Raise the IPL to IPL_HIGH.
1.48 yamt 1159: * FPU IPIs can alter the LWP's saved cr0. Dropping the priority
1160: * is deferred until mi_switch(), when cpu_switchto() returns.
1161: */
1.97 bouyer 1162: #ifdef XEN
1163: pushl %edi
1164: call _C_LABEL(i386_tls_switch)
1165: addl $4,%esp
1166: #else /* !XEN */
1.108 christos 1167: movl $IPL_HIGH,CPUVAR(ILEVEL)
1168: movl PCB_CR0(%ebx),%ecx /* has CR0_TS clear */
1.48 yamt 1169: movl %cr0,%edx
1.1 fvdl 1170:
1.108 christos 1171: /*
1172: * If our floating point registers are on a different CPU,
1173: * set CR0_TS so we'll trap rather than reuse bogus state.
1174: */
1175: cmpl CPUVAR(FPCURLWP),%edi
1.132 maxv 1176: je skip_TS
1.108 christos 1177: orl $CR0_TS,%ecx
1.132 maxv 1178: skip_TS:
1.108 christos 1179:
1.48 yamt 1180: /* Reloading CR0 is very expensive - avoid if possible. */
1.132 maxv 1181: cmpl %edx,%ecx
1182: je switch_return
1.1 fvdl 1183: movl %ecx,%cr0
1.97 bouyer 1184: #endif /* !XEN */
1.1 fvdl 1185:
1.132 maxv 1186: switch_return:
1.48 yamt 1187: /* Return to the new LWP, returning 'oldlwp' in %eax. */
1.132 maxv 1188: movl %esi,%eax
1.1 fvdl 1189: popl %edi
1190: popl %esi
1191: popl %ebx
1192: ret
1.20 dsl 1193:
1.60 yamt 1194: .Lcopy_iobitmap:
1195: /* Copy I/O bitmap. */
1.86 ad 1196: incl _C_LABEL(pmap_iobmp_evcnt)+EV_COUNT
1.60 yamt 1197: movl $(IOMAPSIZE/4),%ecx
1198: pushl %esi
1199: pushl %edi
1200: movl %eax,%esi /* pcb_iomap */
1201: movl CPUVAR(SELF),%edi
1202: leal CPU_INFO_IOMAP(%edi),%edi
1203: rep
1204: movsl
1205: popl %edi
1206: popl %esi
1207: movl $((CPU_INFO_IOMAP - CPU_INFO_TSS) << 16),CPUVAR(IOBASE)
1208: jmp .Liobitmap_done
1.72 yamt 1209: END(cpu_switchto)
1.60 yamt 1210:
1.1 fvdl 1211: /*
1212: * void savectx(struct pcb *pcb);
1.48 yamt 1213: *
1.1 fvdl 1214: * Update pcb, saving current processor state.
1215: */
1216: ENTRY(savectx)
1.115 maxv 1217: movl 4(%esp),%edx /* edx = pcb */
1.1 fvdl 1218: movl %esp,PCB_ESP(%edx)
1219: movl %ebp,PCB_EBP(%edx)
1220: ret
1.72 yamt 1221: END(savectx)
1.1 fvdl 1222:
1223: /*
1.48 yamt 1224: * syscall()
1225: *
1.1 fvdl 1226: * Trap gate entry for syscall
1227: */
1228: IDTVEC(syscall)
1.115 maxv 1229: pushl $2 /* size of instruction for restart */
1230: pushl $T_ASTFLT /* trap # for doing ASTs */
1.1 fvdl 1231: INTRENTRY
1.85 ad 1232: STI(%eax)
1.1 fvdl 1233: #ifdef DIAGNOSTIC
1234: movl CPUVAR(ILEVEL),%ebx
1235: testl %ebx,%ebx
1236: jz 1f
1237: pushl $5f
1.84 ad 1238: call _C_LABEL(panic)
1.1 fvdl 1239: addl $4,%esp
1240: #ifdef DDB
1241: int $3
1242: #endif
1.30 junyoung 1243: 1:
1.1 fvdl 1244: #endif /* DIAGNOSTIC */
1.115 maxv 1245: addl $1,CPUVAR(NSYSCALL) /* count it atomically */
1246: adcl $0,CPUVAR(NSYSCALL)+4 /* count it atomically */
1.68 ad 1247: movl CPUVAR(CURLWP),%edi
1248: movl L_PROC(%edi),%edx
1.115 maxv 1249: movl %esp,L_MD_REGS(%edi) /* save pointer to frame */
1.15 fvdl 1250: pushl %esp
1.115 maxv 1251: call *P_MD_SYSCALL(%edx) /* get pointer to syscall() function */
1.15 fvdl 1252: addl $4,%esp
1.27 yamt 1253: .Lsyscall_checkast:
1.24 yamt 1254: /* Check for ASTs on exit to user mode. */
1.62 bouyer 1255: CLI(%eax)
1.68 ad 1256: movl L_MD_ASTPENDING(%edi), %eax
1257: orl CPUVAR(WANT_PMAPLOAD), %eax
1.24 yamt 1258: jnz 9f
1.62 bouyer 1259: #ifdef XEN
1260: STIC(%eax)
1261: jz 14f
1262: call _C_LABEL(stipending)
1263: testl %eax,%eax
1264: jz 14f
1265: /* process pending interrupts */
1266: CLI(%eax)
1267: movl CPUVAR(ILEVEL), %ebx
1.115 maxv 1268: movl $.Lsyscall_resume, %esi /* address to resume loop at */
1.62 bouyer 1269: .Lsyscall_resume:
1.115 maxv 1270: movl %ebx,%eax /* get cpl */
1.62 bouyer 1271: movl CPUVAR(IUNMASK)(,%eax,4),%eax
1.115 maxv 1272: andl CPUVAR(IPENDING),%eax /* any non-masked bits left? */
1.62 bouyer 1273: jz 17f
1274: bsrl %eax,%eax
1275: btrl %eax,CPUVAR(IPENDING)
1276: movl CPUVAR(ISOURCES)(,%eax,4),%eax
1277: jmp *IS_RESUME(%eax)
1.115 maxv 1278: 17: movl %ebx, CPUVAR(ILEVEL) /* restore cpl */
1.62 bouyer 1279: jmp .Lsyscall_checkast
1280: 14:
1281: #endif /* XEN */
1.1 fvdl 1282: #ifndef DIAGNOSTIC
1.24 yamt 1283: INTRFASTEXIT
1.1 fvdl 1284: #else /* DIAGNOSTIC */
1.24 yamt 1285: cmpl $IPL_NONE,CPUVAR(ILEVEL)
1.1 fvdl 1286: jne 3f
1287: INTRFASTEXIT
1.62 bouyer 1288: 3: STI(%eax)
1.1 fvdl 1289: pushl $4f
1.84 ad 1290: call _C_LABEL(panic)
1.1 fvdl 1291: addl $4,%esp
1.58 ad 1292: pushl $IPL_NONE
1293: call _C_LABEL(spllower)
1294: addl $4,%esp
1.53 yamt 1295: jmp .Lsyscall_checkast
1.84 ad 1296: 4: .asciz "SPL NOT LOWERED ON SYSCALL EXIT\n"
1297: 5: .asciz "SPL NOT ZERO ON SYSCALL ENTRY\n"
1.1 fvdl 1298: #endif /* DIAGNOSTIC */
1.68 ad 1299: 9:
1300: cmpl $0, CPUVAR(WANT_PMAPLOAD)
1301: jz 10f
1302: STI(%eax)
1.24 yamt 1303: call _C_LABEL(pmap_load)
1.27 yamt 1304: jmp .Lsyscall_checkast /* re-check ASTs */
1.68 ad 1305: 10:
1306: /* Always returning to user mode here. */
1307: movl $0, L_MD_ASTPENDING(%edi)
1308: STI(%eax)
1309: /* Pushed T_ASTFLT into tf_trapno on entry. */
1310: pushl %esp
1311: call _C_LABEL(trap)
1312: addl $4,%esp
1313: jmp .Lsyscall_checkast /* re-check ASTs */
1.72 yamt 1314: IDTVEC_END(syscall)
1.1 fvdl 1315:
1.48 yamt 1316: /*
1317: * int npx586bug1(int a, int b)
1.110 dsl 1318: * Used when checking for the FDIV bug on first generations pentiums.
1319: * Anything 120MHz or above is fine.
1.48 yamt 1320: */
1.1 fvdl 1321: NENTRY(npx586bug1)
1.115 maxv 1322: fildl 4(%esp) /* x */
1323: fildl 8(%esp) /* y */
1.1 fvdl 1324: fld %st(1)
1.115 maxv 1325: fdiv %st(1),%st /* x/y */
1326: fmulp %st,%st(1) /* (x/y)*y */
1327: fsubrp %st,%st(1) /* x-(x/y)*y */
1.1 fvdl 1328: pushl $0
1329: fistpl (%esp)
1330: popl %eax
1331: ret
1.72 yamt 1332: END(npx586bug1)
1.50 ad 1333:
1334: /*
1.76 ad 1335: * void sse2_idlezero_page(void *pg)
1.50 ad 1336: *
1.76 ad 1337: * Zero a page without polluting the cache. Preemption must be
1338: * disabled by the caller. Abort if a preemption is pending.
1.50 ad 1339: */
1.76 ad 1340: ENTRY(sse2_idlezero_page)
1.50 ad 1341: pushl %ebp
1342: movl %esp,%ebp
1343: movl 8(%esp), %edx
1.76 ad 1344: movl $(PAGE_SIZE/32), %ecx
1.50 ad 1345: xorl %eax, %eax
1346: .align 16
1347: 1:
1.82 ad 1348: testl $RESCHED_KPREEMPT, CPUVAR(RESCHED)
1.76 ad 1349: jnz 2f
1.50 ad 1350: movnti %eax, 0(%edx)
1351: movnti %eax, 4(%edx)
1352: movnti %eax, 8(%edx)
1353: movnti %eax, 12(%edx)
1354: movnti %eax, 16(%edx)
1355: movnti %eax, 20(%edx)
1356: movnti %eax, 24(%edx)
1357: movnti %eax, 28(%edx)
1.76 ad 1358: addl $32, %edx
1.75 ad 1359: decl %ecx
1.50 ad 1360: jnz 1b
1361: sfence
1.76 ad 1362: incl %eax
1.50 ad 1363: pop %ebp
1364: ret
1.76 ad 1365: 2:
1.50 ad 1366: sfence
1367: popl %ebp
1368: ret
1.76 ad 1369: END(sse2_idlezero_page)
1.152 ! maxv 1370:
! 1371: ENTRY(intrfastexit)
! 1372: movw TF_GS(%esp),%gs
! 1373: movw TF_FS(%esp),%fs
! 1374: movw TF_ES(%esp),%es
! 1375: movw TF_DS(%esp),%ds
! 1376: movl TF_EDI(%esp),%edi
! 1377: movl TF_ESI(%esp),%esi
! 1378: movl TF_EBP(%esp),%ebp
! 1379: movl TF_EBX(%esp),%ebx
! 1380: movl TF_EDX(%esp),%edx
! 1381: movl TF_ECX(%esp),%ecx
! 1382: movl TF_EAX(%esp),%eax
! 1383: addl $(TF_PUSHSIZE+8),%esp
! 1384: iret
! 1385: END(intrfastexit)
! 1386:
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