Annotation of src/sys/arch/i386/i386/locore.S, Revision 1.141
1.141 ! maxv 1: /* $NetBSD: locore.S,v 1.140 2016/11/11 11:34:51 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>
1.141 ! maxv 131: __KERNEL_RCSID(0, "$NetBSD: locore.S,v 1.140 2016/11/11 11:34:51 maxv Exp $");
1.59 lukem 132:
1.18 christos 133: #include "opt_compat_oldboot.h"
1.114 uebayasi 134: #include "opt_copy_symtab.h"
1.1 fvdl 135: #include "opt_ddb.h"
1.83 apb 136: #include "opt_modular.h"
1.78 joerg 137: #include "opt_multiboot.h"
1.1 fvdl 138: #include "opt_realmem.h"
1.18 christos 139: #include "opt_vm86.h"
1.62 bouyer 140: #include "opt_xen.h"
1.1 fvdl 141:
142: #include "assym.h"
143: #include "lapic.h"
144: #include "ioapic.h"
1.8 fvdl 145: #include "ksyms.h"
1.1 fvdl 146:
147: #include <sys/errno.h>
148: #include <sys/syscall.h>
149:
150: #include <machine/segments.h>
151: #include <machine/specialreg.h>
152: #include <machine/trap.h>
153: #include <machine/i82489reg.h>
1.48 yamt 154: #include <machine/frameasm.h>
155: #include <machine/i82489reg.h>
1.127 maxv 156: #include <machine/cputypes.h>
157:
1.62 bouyer 158: #ifndef XEN
159: #include <machine/multiboot.h>
160: #endif
1.1 fvdl 161:
162: /* Get definitions for IOM_BEGIN, IOM_END, and IOM_SIZE */
163: #include <dev/isa/isareg.h>
164:
1.104 uebayasi 165: #ifndef XEN
166: #define _RELOC(x) ((x) - KERNBASE)
167: #else
168: #define _RELOC(x) ((x))
169: #endif /* XEN */
170: #define RELOC(x) _RELOC(_C_LABEL(x))
171:
1.119 maxv 172: /* 32bit version of PG_NX */
173: #define PG_NX32 0x80000000
174:
1.115 maxv 175: #ifndef PAE
176: #define PROC0_PDIR_OFF 0
177: #else
178: #define PROC0_L3_OFF 0
179: #define PROC0_PDIR_OFF 1 * PAGE_SIZE
180: #endif
181:
182: #define PROC0_STK_OFF (PROC0_PDIR_OFF + PDP_SIZE * PAGE_SIZE)
183: #define PROC0_PTP1_OFF (PROC0_STK_OFF + UPAGES * PAGE_SIZE)
184:
185: /*
186: * fillkpt - Fill in a kernel page table
187: * eax = pte (page frame | control | status)
188: * ebx = page table address
189: * ecx = number of pages to map
190: *
191: * For PAE, each entry is 8 bytes long: we must set the 4 upper bytes to 0.
192: * This is done by the first instruction of fillkpt. In the non-PAE case, this
193: * instruction just clears the page table entry.
194: */
195: #define fillkpt \
1.125 maxv 196: cmpl $0,%ecx ; /* zero-sized? */ \
197: je 2f ; \
1.115 maxv 198: 1: movl $0,(PDE_SIZE-4)(%ebx) ; /* upper 32 bits: 0 */ \
199: movl %eax,(%ebx) ; /* store phys addr */ \
200: addl $PDE_SIZE,%ebx ; /* next PTE/PDE */ \
201: addl $PAGE_SIZE,%eax ; /* next phys page */ \
1.125 maxv 202: loop 1b ; \
203: 2: ;
1.115 maxv 204:
1.118 maxv 205: /*
1.120 maxv 206: * fillkpt_nox - Same as fillkpt, but sets the NX/XD bit.
207: */
208: #define fillkpt_nox \
1.125 maxv 209: cmpl $0,%ecx ; /* zero-sized? */ \
210: je 2f ; \
1.120 maxv 211: pushl %ebp ; \
212: movl RELOC(nox_flag),%ebp ; \
213: 1: movl %ebp,(PDE_SIZE-4)(%ebx) ; /* upper 32 bits: NX */ \
214: movl %eax,(%ebx) ; /* store phys addr */ \
215: addl $PDE_SIZE,%ebx ; /* next PTE/PDE */ \
216: addl $PAGE_SIZE,%eax ; /* next phys page */ \
217: loop 1b ; \
1.125 maxv 218: popl %ebp ; \
219: 2: ;
1.120 maxv 220:
221: /*
1.129 maxv 222: * fillkpt_blank - Fill in a kernel page table with blank entries
223: * ebx = page table address
224: * ecx = number of pages to map
225: */
226: #define fillkpt_blank \
227: cmpl $0,%ecx ; /* zero-sized? */ \
228: je 2f ; \
229: 1: movl $0,(PDE_SIZE-4)(%ebx) ; /* upper 32 bits: 0 */ \
230: movl $0,(%ebx) ; /* lower 32 bits: 0 */ \
231: addl $PDE_SIZE,%ebx ; /* next PTE/PDE */ \
232: loop 1b ; \
233: 2: ;
234:
235: /*
1.118 maxv 236: * killkpt - Destroy a kernel page table
237: * ebx = page table address
238: * ecx = number of pages to destroy
239: */
240: #define killkpt \
241: 1: movl $0,(PDE_SIZE-4)(%ebx) ; /* upper bits (for PAE) */ \
242: movl $0,(%ebx) ; \
243: addl $PDE_SIZE,%ebx ; \
244: loop 1b ;
245:
1.115 maxv 246:
1.62 bouyer 247: #ifdef XEN
248: /*
249: * Xen guest identifier and loader selection
250: */
251: .section __xen_guest
252: .ascii "GUEST_OS=netbsd,GUEST_VER=3.0,XEN_VER=xen-3.0"
1.106 uebayasi 253: .ascii ",VIRT_BASE=0xc0000000" /* KERNBASE */
254: .ascii ",ELF_PADDR_OFFSET=0xc0000000" /* KERNBASE */
255: .ascii ",VIRT_ENTRY=0xc0100000" /* KERNTEXTOFF */
256: .ascii ",HYPERCALL_PAGE=0x00000101"
1.62 bouyer 257: /* (???+HYPERCALL_PAGE_OFFSET)/PAGE_SIZE) */
1.66 bouyer 258: #ifdef PAE
1.106 uebayasi 259: .ascii ",PAE=yes[extended-cr3]"
1.66 bouyer 260: #endif
1.62 bouyer 261: .ascii ",LOADER=generic"
1.114 uebayasi 262: #if (NKSYMS || defined(DDB) || defined(MODULAR)) && !defined(makeoptions_COPY_SYMTAB)
1.62 bouyer 263: .ascii ",BSD_SYMTAB=yes"
264: #endif
265: .byte 0
1.106 uebayasi 266: #endif /* XEN */
1.62 bouyer 267:
1.1 fvdl 268: /*
269: * Initialization
270: */
271: .data
272:
1.127 maxv 273: .globl _C_LABEL(tablesize)
274: .globl _C_LABEL(nox_flag)
275: .globl _C_LABEL(cputype)
276: .globl _C_LABEL(cpuid_level)
277: .globl _C_LABEL(esym)
278: .globl _C_LABEL(eblob)
279: .globl _C_LABEL(atdevbase)
280: .globl _C_LABEL(PDPpaddr)
281: .globl _C_LABEL(lwp0uarea)
282: .globl _C_LABEL(gdt)
283: .globl _C_LABEL(idt)
284:
1.126 maxv 285: .type _C_LABEL(tablesize), @object
286: _C_LABEL(tablesize): .long 0
287: END(tablesize)
1.119 maxv 288: .type _C_LABEL(nox_flag), @object
289: LABEL(nox_flag) .long 0 /* 32bit NOX flag, set if supported */
290: END(nox_flag)
1.104 uebayasi 291: .type _C_LABEL(cputype), @object
1.115 maxv 292: LABEL(cputype) .long 0 /* are we 80486, Pentium, or.. */
1.104 uebayasi 293: END(cputype)
294: .type _C_LABEL(cpuid_level), @object
1.128 maxv 295: LABEL(cpuid_level) .long -1 /* max. level accepted by cpuid instr */
1.104 uebayasi 296: END(cpuid_level)
297: .type _C_LABEL(atdevbase), @object
1.115 maxv 298: LABEL(atdevbase) .long 0 /* location of start of iomem in virt */
1.104 uebayasi 299: END(atdevbase)
300: .type _C_LABEL(lwp0uarea), @object
301: LABEL(lwp0uarea) .long 0
302: END(lwp0uarea)
303: .type _C_LABEL(PDPpaddr), @object
1.115 maxv 304: LABEL(PDPpaddr) .long 0 /* paddr of PDP, for libkvm */
1.104 uebayasi 305: END(PDPpaddr)
1.115 maxv 306:
307: /* Space for the temporary stack */
1.104 uebayasi 308: .size tmpstk, tmpstk - .
1.115 maxv 309: .space 512
1.1 fvdl 310: tmpstk:
1.96 cherry 311: #ifdef XEN
1.115 maxv 312: .align PAGE_SIZE, 0x0 /* Align on page boundary */
1.104 uebayasi 313: LABEL(tmpgdt)
1.115 maxv 314: .space PAGE_SIZE /* Xen expects a page */
1.104 uebayasi 315: END(tmpgdt)
1.96 cherry 316: #endif /* XEN */
1.1 fvdl 317:
318: .text
319: .globl _C_LABEL(kernel_text)
320: .set _C_LABEL(kernel_text),KERNTEXTOFF
321:
1.104 uebayasi 322: ENTRY(start)
1.62 bouyer 323: #ifndef XEN
1.115 maxv 324:
325: /* Warm boot */
326: movw $0x1234,0x472
327:
1.37 jmmv 328: #if defined(MULTIBOOT)
329: jmp 1f
330:
331: .align 4
332: .globl Multiboot_Header
333: _C_LABEL(Multiboot_Header):
1.44 jmmv 334: #define MULTIBOOT_HEADER_FLAGS (MULTIBOOT_HEADER_WANT_MEMORY)
1.37 jmmv 335: .long MULTIBOOT_HEADER_MAGIC
336: .long MULTIBOOT_HEADER_FLAGS
337: .long -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS)
338:
339: 1:
340: /* Check if we are being executed by a Multiboot-compliant boot
341: * loader. */
342: cmpl $MULTIBOOT_INFO_MAGIC,%eax
343: jne 1f
344:
1.43 mrg 345: /*
346: * Indeed, a multiboot-compliant boot loader executed us. We copy
1.37 jmmv 347: * the received Multiboot information structure into kernel's data
348: * space to process it later -- after we are relocated. It will
1.43 mrg 349: * be safer to run complex C code than doing it at this point.
350: */
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). */
1.1 fvdl 604: movl $RELOC(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:
1.93 jym 636: /* tablesize = (PDP_SIZE + UPAGES + nkptp) << PGSHIFT; */
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:
1.117 maxv 646: /* Ensure that nkptp covers BOOTSTRAP TABLES. */
1.53 yamt 647: addl %esi,%eax
648: addl $~L2_FRAME,%eax
649: shrl $L2_SHIFT,%eax
650: incl %eax
651: cmpl %eax,RELOC(nkptp)+1*4
652: jnz 1b
653:
1.117 maxv 654: /* Now, zero out the BOOTSTRAP TABLES (before filling them in). */
1.105 uebayasi 655: movl %esi,%edi
1.1 fvdl 656: xorl %eax,%eax
657: cld
1.105 uebayasi 658: movl RELOC(tablesize),%ecx
659: shrl $2,%ecx
1.1 fvdl 660: rep
1.117 maxv 661: stosl /* copy eax -> edi */
1.1 fvdl 662:
663: /*
1.117 maxv 664: * Build the page tables and levels. We go from L1 to L2/L3, and link the levels
665: * together. Note: RELOC computes &addr - KERNBASE in 32 bits; the value can't
666: * be > 4G, or we can't deal with it anyway, since we are in 32bit mode.
1.1 fvdl 667: */
1.105 uebayasi 668: /*
1.117 maxv 669: * Build L1.
1.105 uebayasi 670: */
1.117 maxv 671: leal (PROC0_PTP1_OFF)(%esi),%ebx
672:
673: /* Skip the first MB. */
1.129 maxv 674: movl $(KERNTEXTOFF - KERNBASE),%ecx
675: shrl $PGSHIFT,%ecx
676: fillkpt_blank
1.1 fvdl 677:
1.121 maxv 678: /* Map the kernel text RX. */
1.129 maxv 679: movl $(KERNTEXTOFF - KERNBASE),%eax /* start of TEXT */
1.121 maxv 680: movl $RELOC(__rodata_start),%ecx
1.1 fvdl 681: subl %eax,%ecx
682: shrl $PGSHIFT,%ecx
683: orl $(PG_V|PG_KR),%eax
684: fillkpt
685:
1.121 maxv 686: /* Map the kernel rodata R. */
687: movl $RELOC(__rodata_start),%eax
688: movl $RELOC(__data_start),%ecx
689: subl %eax,%ecx
690: shrl $PGSHIFT,%ecx
691: orl $(PG_V|PG_KR),%eax
692: fillkpt_nox
693:
694: /* Map the kernel data+bss RW. */
695: movl $RELOC(__data_start),%eax
696: movl $RELOC(__kernel_end),%ecx
697: subl %eax,%ecx
1.1 fvdl 698: shrl $PGSHIFT,%ecx
1.121 maxv 699: orl $(PG_V|PG_KW),%eax
700: fillkpt_nox
701:
1.134 maxv 702: /* Map [SYMS]+[PRELOADED MODULES] RW. */
1.121 maxv 703: movl $RELOC(__kernel_end),%eax
704: movl %esi,%ecx /* start of BOOTSTRAP TABLES */
1.124 maxv 705: subl %eax,%ecx
1.121 maxv 706: shrl $PGSHIFT,%ecx
707: orl $(PG_V|PG_KW),%eax
1.134 maxv 708: fillkpt_nox
1.1 fvdl 709:
1.124 maxv 710: /* Map the BOOTSTRAP TABLES RW. */
711: movl %esi,%eax /* start of BOOTSTRAP TABLES */
712: movl RELOC(tablesize),%ecx /* length of BOOTSTRAP TABLES */
713: shrl $PGSHIFT,%ecx
714: orl $(PG_V|PG_KW),%eax
715: fillkpt_nox
716:
1.131 maxv 717: /* We are on (4). Map ISA I/O MEM RW. */
1.130 maxv 718: movl $IOM_BEGIN,%eax
719: movl $IOM_SIZE,%ecx /* size of ISA I/O MEM */
720: shrl $PGSHIFT,%ecx
721: orl $(PG_V|PG_KW/*|PG_N*/),%eax
1.131 maxv 722: fillkpt_nox
1.1 fvdl 723:
1.117 maxv 724: /*
725: * Build L2 for identity mapping. Linked to L1.
726: */
1.105 uebayasi 727: leal (PROC0_PDIR_OFF)(%esi),%ebx
728: leal (PROC0_PTP1_OFF)(%esi),%eax
1.117 maxv 729: orl $(PG_V|PG_KW),%eax
1.105 uebayasi 730: movl RELOC(nkptp)+1*4,%ecx
1.1 fvdl 731: fillkpt
732:
1.117 maxv 733: /* Set up L2 entries for actual kernel mapping */
734: leal (PROC0_PDIR_OFF + L2_SLOT_KERNBASE * PDE_SIZE)(%esi),%ebx
1.105 uebayasi 735: leal (PROC0_PTP1_OFF)(%esi),%eax
1.117 maxv 736: orl $(PG_V|PG_KW),%eax
1.105 uebayasi 737: movl RELOC(nkptp)+1*4,%ecx
1.1 fvdl 738: fillkpt
739:
1.135 maxv 740: /* Install recursive top level PDE */
1.117 maxv 741: leal (PROC0_PDIR_OFF + PDIR_SLOT_PTE * PDE_SIZE)(%esi),%ebx
1.105 uebayasi 742: leal (PROC0_PDIR_OFF)(%esi),%eax
743: orl $(PG_V|PG_KW),%eax
1.93 jym 744: movl $PDP_SIZE,%ecx
1.135 maxv 745: fillkpt_nox
1.93 jym 746:
747: #ifdef PAE
1.117 maxv 748: /*
749: * Build L3. Linked to L2.
750: */
1.93 jym 751: leal (PROC0_L3_OFF)(%esi),%ebx
752: leal (PROC0_PDIR_OFF)(%esi),%eax
753: orl $(PG_V),%eax
754: movl $PDP_SIZE,%ecx
755: fillkpt
756:
757: /* Enable PAE mode */
758: movl %cr4,%eax
759: orl $CR4_PAE,%eax
760: movl %eax,%cr4
761: #endif
1.1 fvdl 762:
1.117 maxv 763: /* Save physical address of L2. */
1.93 jym 764: leal (PROC0_PDIR_OFF)(%esi),%eax
765: movl %eax,RELOC(PDPpaddr)
1.1 fvdl 766:
1.93 jym 767: /*
768: * Startup checklist:
1.117 maxv 769: * 1. Load %cr3 with pointer to L2 (or L3 for PAE).
1.93 jym 770: */
1.117 maxv 771: movl %esi,%eax
772: movl %eax,%cr3
1.93 jym 773:
1.105 uebayasi 774: /*
1.119 maxv 775: * 2. Set NOX in EFER, if available.
776: */
777: movl RELOC(nox_flag),%ebx
778: cmpl $0,%ebx
779: je skip_NOX
780: movl $MSR_EFER,%ecx
781: rdmsr
782: xorl %eax,%eax
783: orl $(EFER_NXE),%eax
784: wrmsr
785: skip_NOX:
786:
787: /*
788: * 3. Enable paging and the rest of it.
1.105 uebayasi 789: */
1.115 maxv 790: movl %cr0,%eax
1.111 dsl 791: orl $(CR0_PE|CR0_PG|CR0_NE|CR0_TS|CR0_MP|CR0_WP|CR0_AM),%eax
1.115 maxv 792: movl %eax,%cr0
1.1 fvdl 793:
1.115 maxv 794: pushl $begin /* jump to high mem */
1.1 fvdl 795: ret
796:
797: begin:
1.105 uebayasi 798: /*
1.117 maxv 799: * We have arrived. There's no need anymore for the identity mapping in
800: * low memory, remove it.
1.105 uebayasi 801: */
802: movl _C_LABEL(nkptp)+1*4,%ecx
1.115 maxv 803: leal (PROC0_PDIR_OFF)(%esi),%ebx /* old, phys address of PDIR */
804: addl $(KERNBASE), %ebx /* new, virt address of PDIR */
1.118 maxv 805: killkpt
1.1 fvdl 806:
807: /* Relocate atdevbase. */
1.53 yamt 808: movl $KERNBASE,%edx
809: addl _C_LABEL(tablesize),%edx
1.1 fvdl 810: addl %esi,%edx
811: movl %edx,_C_LABEL(atdevbase)
812:
813: /* Set up bootstrap stack. */
1.105 uebayasi 814: leal (PROC0_STK_OFF+KERNBASE)(%esi),%eax
1.91 rmind 815: movl %eax,_C_LABEL(lwp0uarea)
1.112 dsl 816: leal (USPACE-FRAMESIZE)(%eax),%esp
1.115 maxv 817: movl %esi,PCB_CR3(%eax) /* pcb->pcb_cr3 */
818: xorl %ebp,%ebp /* mark end of frames */
1.1 fvdl 819:
1.37 jmmv 820: #if defined(MULTIBOOT)
821: /* It is now safe to parse the Multiboot information structure
822: * we saved before from C code. Note that we cannot delay its
823: * parsing any more because initgdt (called below) needs to make
824: * use of this information. */
825: call _C_LABEL(multiboot_post_reloc)
826: #endif
827:
1.115 maxv 828: subl $NGDT*8, %esp /* space for temporary gdt */
1.1 fvdl 829: pushl %esp
830: call _C_LABEL(initgdt)
831: addl $4,%esp
1.30 junyoung 832:
1.105 uebayasi 833: movl _C_LABEL(tablesize),%eax
1.115 maxv 834: addl %esi,%eax /* skip past stack and page tables */
1.1 fvdl 835:
1.93 jym 836: #ifdef PAE
1.115 maxv 837: pushl $0 /* init386() expects a 64 bits paddr_t with PAE */
1.93 jym 838: #endif
1.1 fvdl 839: pushl %eax
1.139 maxv 840: call _C_LABEL(init386)
1.115 maxv 841: addl $PDE_SIZE,%esp /* pop paddr_t */
842: addl $NGDT*8,%esp /* pop temporary gdt */
1.1 fvdl 843:
844: #ifdef SAFARI_FIFO_HACK
845: movb $5,%al
846: movw $0x37b,%dx
847: outb %al,%dx
848: movw $0x37f,%dx
849: inb %dx,%al
850: movb %al,%cl
851:
852: orb $1,%cl
853:
854: movb $5,%al
855: movw $0x37b,%dx
856: outb %al,%dx
857: movw $0x37f,%dx
858: movb %cl,%al
859: outb %al,%dx
860: #endif /* SAFARI_FIFO_HACK */
861:
862: call _C_LABEL(main)
1.62 bouyer 863: #else /* XEN */
864: /* First, reset the PSL. */
865: pushl $PSL_MBO
866: popfl
867:
868: cld
1.139 maxv 869:
870: /*
871: * Xen info:
872: * - %esp -> stack, *theoretically* the last used page by Xen bootstrap
873: */
874: movl %esp,%ebx
875: movl $_RELOC(tmpstk),%esp
1.62 bouyer 876:
1.106 uebayasi 877: /* Clear BSS. */
1.62 bouyer 878: xorl %eax,%eax
879: movl $RELOC(__bss_start),%edi
880: movl $RELOC(_end),%ecx
881: subl %edi,%ecx
1.139 maxv 882: rep
883: stosb
1.62 bouyer 884:
885: /* Copy the necessary stuff from start_info structure. */
1.105 uebayasi 886: /* We need to copy shared_info early, so that sti/cli work */
1.62 bouyer 887: movl $RELOC(start_info_union),%edi
888: movl $128,%ecx
1.139 maxv 889: rep
890: movsl
1.62 bouyer 891:
1.139 maxv 892: /* Clear segment registers. */
1.62 bouyer 893: xorl %eax,%eax
894: movw %ax,%fs
895: movw %ax,%gs
896:
897: xorl %eax,%eax
898: cpuid
1.73 ad 899: movl %eax,RELOC(cpuid_level)
1.62 bouyer 900:
1.96 cherry 901: /*
1.139 maxv 902: * Use a temporary GDT page. We'll re-add it to uvm(9) once we're done
903: * using it.
1.96 cherry 904: */
1.139 maxv 905: movl $RELOC(tmpgdt),%eax
1.115 maxv 906: pushl %eax /* start of temporary gdt */
1.96 cherry 907: call _C_LABEL(initgdt)
908: addl $4,%esp
909:
1.140 maxv 910: call xen_locore
1.92 jym 911:
1.62 bouyer 912: /*
1.140 maxv 913: * The first VA available is returned by xen_locore in %eax. We
1.139 maxv 914: * use it as the UAREA, and set up the stack here.
1.62 bouyer 915: */
1.139 maxv 916: movl %eax,%esi
917: movl %esi,_C_LABEL(lwp0uarea)
1.112 dsl 918: leal (USPACE-FRAMESIZE)(%eax),%esp
1.115 maxv 919: xorl %ebp,%ebp /* mark end of frames */
1.62 bouyer 920:
1.139 maxv 921: /* Set first_avail after the UAREA. */
922: addl $USPACE,%esi
923: subl $KERNBASE,%esi /* init386 wants a physical address */
1.92 jym 924:
925: #ifdef PAE
1.115 maxv 926: pushl $0 /* init386() expects a 64 bits paddr_t with PAE */
1.92 jym 927: #endif
1.62 bouyer 928: pushl %esi
1.139 maxv 929: call _C_LABEL(init386)
1.115 maxv 930: addl $PDE_SIZE,%esp /* pop paddr_t */
1.62 bouyer 931: call _C_LABEL(main)
1.106 uebayasi 932: #endif /* XEN */
1.104 uebayasi 933: END(start)
1.62 bouyer 934:
1.101 jym 935: #if defined(XEN)
1.62 bouyer 936: /* space for the hypercall call page */
937: #define HYPERCALL_PAGE_OFFSET 0x1000
938: .org HYPERCALL_PAGE_OFFSET
939: ENTRY(hypercall_page)
940: .skip 0x1000
1.104 uebayasi 941: END(hypercall_page)
1.62 bouyer 942:
943: /*
944: * void lgdt_finish(void);
945: * Finish load a new GDT pointer (do any necessary cleanup).
946: * XXX It's somewhat questionable whether reloading all the segment registers
947: * is necessary, since the actual descriptor data is not changed except by
948: * process creation and exit, both of which clean up via task switches. OTOH,
949: * this only happens at run time when the GDT is resized.
950: */
951: /* LINTSTUB: Func: void lgdt_finish(void) */
952: NENTRY(lgdt_finish)
953: movl $GSEL(GDATA_SEL, SEL_KPL),%eax
954: movw %ax,%ds
955: movw %ax,%es
956: movw %ax,%gs
957: movw %ax,%ss
958: movl $GSEL(GCPU_SEL, SEL_KPL),%eax
959: movw %ax,%fs
960: /* Reload code selector by doing intersegment return. */
961: popl %eax
962: pushl $GSEL(GCODE_SEL, SEL_KPL)
963: pushl %eax
964: lret
1.72 yamt 965: END(lgdt_finish)
1.62 bouyer 966:
967: #endif /* XEN */
1.1 fvdl 968:
969: /*
1.48 yamt 970: * void lwp_trampoline(void);
971: *
1.1 fvdl 972: * This is a trampoline function pushed onto the stack of a newly created
973: * process in order to do some additional setup. The trampoline is entered by
1.109 christos 974: * cpu_switchto()ing to the process, so we abuse the callee-saved
975: * registers used by cpu_switchto() to store the information about the
976: * stub to call.
1.1 fvdl 977: * NOTE: This function does not have a normal calling sequence!
978: */
1.48 yamt 979: NENTRY(lwp_trampoline)
1.68 ad 980: movl %ebp,%edi /* for .Lsyscall_checkast */
1.48 yamt 981: xorl %ebp,%ebp
1.68 ad 982: pushl %edi
1.48 yamt 983: pushl %eax
984: call _C_LABEL(lwp_startup)
985: addl $8,%esp
1.1 fvdl 986: pushl %ebx
987: call *%esi
988: addl $4,%esp
1.68 ad 989: jmp .Lsyscall_checkast
1.1 fvdl 990: /* NOTREACHED */
1.72 yamt 991: END(lwp_trampoline)
1.1 fvdl 992:
993: /*
1.48 yamt 994: * sigcode()
995: *
996: * Signal trampoline; copied to top of user stack. Used only for
997: * compatibility with old releases of NetBSD.
1.1 fvdl 998: */
999: NENTRY(sigcode)
1000: /*
1001: * Handler has returned here as if we called it. The sigcontext
1002: * is on the stack after the 3 args "we" pushed.
1003: */
1.115 maxv 1004: leal 12(%esp),%eax /* get pointer to sigcontext */
1005: movl %eax,4(%esp) /* put it in the argument slot */
1006: /* fake return address already there */
1.17 christos 1007: movl $SYS_compat_16___sigreturn14,%eax
1.115 maxv 1008: int $0x80 /* enter kernel with args on stack */
1.1 fvdl 1009: movl $SYS_exit,%eax
1.115 maxv 1010: int $0x80 /* exit if sigreturn fails */
1.1 fvdl 1011: .globl _C_LABEL(esigcode)
1012: _C_LABEL(esigcode):
1.72 yamt 1013: END(sigcode)
1.1 fvdl 1014:
1015: /*
1.48 yamt 1016: * int setjmp(label_t *)
1017: *
1018: * Used primarily by DDB.
1.1 fvdl 1019: */
1020: ENTRY(setjmp)
1021: movl 4(%esp),%eax
1.115 maxv 1022: movl %ebx,(%eax) /* save ebx */
1023: movl %esp,4(%eax) /* save esp */
1024: movl %ebp,8(%eax) /* save ebp */
1025: movl %esi,12(%eax) /* save esi */
1026: movl %edi,16(%eax) /* save edi */
1027: movl (%esp),%edx /* get rta */
1028: movl %edx,20(%eax) /* save eip */
1029: xorl %eax,%eax /* return 0 */
1.1 fvdl 1030: ret
1.72 yamt 1031: END(setjmp)
1.1 fvdl 1032:
1.48 yamt 1033: /*
1034: * int longjmp(label_t *)
1035: *
1036: * Used primarily by DDB.
1037: */
1.1 fvdl 1038: ENTRY(longjmp)
1039: movl 4(%esp),%eax
1.115 maxv 1040: movl (%eax),%ebx /* restore ebx */
1041: movl 4(%eax),%esp /* restore esp */
1042: movl 8(%eax),%ebp /* restore ebp */
1043: movl 12(%eax),%esi /* restore esi */
1044: movl 16(%eax),%edi /* restore edi */
1045: movl 20(%eax),%edx /* get rta */
1046: movl %edx,(%esp) /* put in return frame */
1047: movl $1,%eax /* return 1 */
1.1 fvdl 1048: ret
1.72 yamt 1049: END(longjmp)
1.1 fvdl 1050:
1.65 skrll 1051: /*
1052: * void dumpsys(void)
1053: *
1054: * Mimic cpu_switchto() for postmortem debugging.
1055: */
1.64 skrll 1056: ENTRY(dumpsys)
1.115 maxv 1057: pushl %ebx /* set up fake switchframe */
1058: pushl %esi /* and save context */
1059: pushl %edi
1.65 skrll 1060: movl %esp,_C_LABEL(dumppcb)+PCB_ESP
1061: movl %ebp,_C_LABEL(dumppcb)+PCB_EBP
1.115 maxv 1062: call _C_LABEL(dodumpsys) /* dump! */
1063: addl $(3*4), %esp /* unwind switchframe */
1.64 skrll 1064: ret
1.72 yamt 1065: END(dumpsys)
1.64 skrll 1066:
1.1 fvdl 1067: /*
1.106 uebayasi 1068: * struct lwp *cpu_switchto(struct lwp *oldlwp, struct lwp *newlwp,
1.132 maxv 1069: * bool returning)
1.30 junyoung 1070: *
1.48 yamt 1071: * 1. if (oldlwp != NULL), save its context.
1072: * 2. then, restore context of newlwp.
1073: *
1074: * Note that the stack frame layout is known to "struct switchframe" in
1075: * <machine/frame.h> and to the code in cpu_lwp_fork() which initializes
1.5 thorpej 1076: * it for a new lwp.
1.1 fvdl 1077: */
1.48 yamt 1078: ENTRY(cpu_switchto)
1.1 fvdl 1079: pushl %ebx
1080: pushl %esi
1081: pushl %edi
1082:
1.70 ad 1083: #if defined(DIAGNOSTIC) && !defined(XEN)
1084: cmpl $IPL_SCHED,CPUVAR(ILEVEL)
1085: jbe 0f
1.74 christos 1086: pushl CPUVAR(ILEVEL)
1.70 ad 1087: pushl $.Lstr
1088: call _C_LABEL(panic)
1.74 christos 1089: addl $8,%esp
1090: .Lstr: .string "cpu_switchto: switching above IPL_SCHED (%d)\0"
1.70 ad 1091: 0:
1092: #endif
1093:
1.115 maxv 1094: movl 16(%esp),%esi /* oldlwp */
1095: movl 20(%esp),%edi /* newlwp */
1096: movl 24(%esp),%edx /* returning */
1.132 maxv 1097:
1098: testl %esi,%esi /* oldlwp = NULL ? */
1099: jz skip_save
1.1 fvdl 1100:
1.48 yamt 1101: /* Save old context. */
1.91 rmind 1102: movl L_PCB(%esi),%eax
1.48 yamt 1103: movl %esp,PCB_ESP(%eax)
1104: movl %ebp,PCB_EBP(%eax)
1.132 maxv 1105: skip_save:
1.48 yamt 1106:
1107: /* Switch to newlwp's stack. */
1.132 maxv 1108: movl L_PCB(%edi),%ebx
1.48 yamt 1109: movl PCB_EBP(%ebx),%ebp
1110: movl PCB_ESP(%ebx),%esp
1.1 fvdl 1111:
1.61 ad 1112: /*
1113: * Set curlwp. This must be globally visible in order to permit
1114: * non-interlocked mutex release.
1115: */
1116: movl %edi,%ecx
1117: xchgl %ecx,CPUVAR(CURLWP)
1.58 ad 1118:
1119: /* Skip the rest if returning to a pinned LWP. */
1120: testl %edx,%edx
1.132 maxv 1121: jnz switch_return
1.58 ad 1122:
1.132 maxv 1123: /* Switch ring0 stack */
1.62 bouyer 1124: #ifdef XEN
1125: pushl %edi
1126: call _C_LABEL(i386_switch_context)
1127: addl $4,%esp
1.132 maxv 1128: #else
1.60 yamt 1129: movl PCB_ESP0(%ebx),%eax
1130: movl %eax,CPUVAR(ESP0)
1.132 maxv 1131: #endif
1.1 fvdl 1132:
1133: /* Don't bother with the rest if switching to a system process. */
1.48 yamt 1134: testl $LW_SYSTEM,L_FLAG(%edi)
1.132 maxv 1135: jnz switch_return
1.1 fvdl 1136:
1.97 bouyer 1137: #ifndef XEN
1.54 ad 1138: /* Restore thread-private %fs/%gs descriptors. */
1.60 yamt 1139: movl CPUVAR(GDT),%ecx
1.132 maxv 1140: movl PCB_FSD(%ebx),%eax
1141: movl PCB_FSD+4(%ebx),%edx
1142: movl %eax,(GUFS_SEL*8)(%ecx)
1143: movl %edx,(GUFS_SEL*8+4)(%ecx)
1144: movl PCB_GSD(%ebx),%eax
1145: movl PCB_GSD+4(%ebx),%edx
1146: movl %eax,(GUGS_SEL*8)(%ecx)
1147: movl %edx,(GUGS_SEL*8+4)(%ecx)
1.97 bouyer 1148: #endif /* !XEN */
1.54 ad 1149:
1.60 yamt 1150: /* Switch I/O bitmap */
1151: movl PCB_IOMAP(%ebx),%eax
1152: orl %eax,%eax
1.95 joerg 1153: jnz .Lcopy_iobitmap
1.60 yamt 1154: movl $(IOMAP_INVALOFF << 16),CPUVAR(IOBASE)
1155: .Liobitmap_done:
1156:
1.56 ad 1157: /* Is this process using RAS (restartable atomic sequences)? */
1158: movl L_PROC(%edi),%eax
1159: cmpl $0,P_RASLIST(%eax)
1.133 maxv 1160: je no_RAS
1161:
1162: /* Handle restartable atomic sequences (RAS). */
1163: movl L_MD_REGS(%edi),%ecx
1164: pushl TF_EIP(%ecx)
1165: pushl %eax
1166: call _C_LABEL(ras_lookup)
1167: addl $8,%esp
1168: cmpl $-1,%eax
1169: je no_RAS
1170: movl L_MD_REGS(%edi),%ecx
1171: movl %eax,TF_EIP(%ecx)
1172: no_RAS:
1.56 ad 1173:
1.48 yamt 1174: /*
1.90 rmind 1175: * Restore cr0 (including FPU state). Raise the IPL to IPL_HIGH.
1.48 yamt 1176: * FPU IPIs can alter the LWP's saved cr0. Dropping the priority
1177: * is deferred until mi_switch(), when cpu_switchto() returns.
1178: */
1.97 bouyer 1179: #ifdef XEN
1180: pushl %edi
1181: call _C_LABEL(i386_tls_switch)
1182: addl $4,%esp
1183: #else /* !XEN */
1.108 christos 1184: movl $IPL_HIGH,CPUVAR(ILEVEL)
1185: movl PCB_CR0(%ebx),%ecx /* has CR0_TS clear */
1.48 yamt 1186: movl %cr0,%edx
1.1 fvdl 1187:
1.108 christos 1188: /*
1189: * If our floating point registers are on a different CPU,
1190: * set CR0_TS so we'll trap rather than reuse bogus state.
1191: */
1192: cmpl CPUVAR(FPCURLWP),%edi
1.132 maxv 1193: je skip_TS
1.108 christos 1194: orl $CR0_TS,%ecx
1.132 maxv 1195: skip_TS:
1.108 christos 1196:
1.48 yamt 1197: /* Reloading CR0 is very expensive - avoid if possible. */
1.132 maxv 1198: cmpl %edx,%ecx
1199: je switch_return
1.1 fvdl 1200: movl %ecx,%cr0
1.97 bouyer 1201: #endif /* !XEN */
1.1 fvdl 1202:
1.132 maxv 1203: switch_return:
1.48 yamt 1204: /* Return to the new LWP, returning 'oldlwp' in %eax. */
1.132 maxv 1205: movl %esi,%eax
1.1 fvdl 1206: popl %edi
1207: popl %esi
1208: popl %ebx
1209: ret
1.20 dsl 1210:
1.60 yamt 1211: .Lcopy_iobitmap:
1212: /* Copy I/O bitmap. */
1.86 ad 1213: incl _C_LABEL(pmap_iobmp_evcnt)+EV_COUNT
1.60 yamt 1214: movl $(IOMAPSIZE/4),%ecx
1215: pushl %esi
1216: pushl %edi
1217: movl %eax,%esi /* pcb_iomap */
1218: movl CPUVAR(SELF),%edi
1219: leal CPU_INFO_IOMAP(%edi),%edi
1220: rep
1221: movsl
1222: popl %edi
1223: popl %esi
1224: movl $((CPU_INFO_IOMAP - CPU_INFO_TSS) << 16),CPUVAR(IOBASE)
1225: jmp .Liobitmap_done
1.72 yamt 1226: END(cpu_switchto)
1.60 yamt 1227:
1.1 fvdl 1228: /*
1229: * void savectx(struct pcb *pcb);
1.48 yamt 1230: *
1.1 fvdl 1231: * Update pcb, saving current processor state.
1232: */
1233: ENTRY(savectx)
1.115 maxv 1234: movl 4(%esp),%edx /* edx = pcb */
1.1 fvdl 1235: movl %esp,PCB_ESP(%edx)
1236: movl %ebp,PCB_EBP(%edx)
1237: ret
1.72 yamt 1238: END(savectx)
1.1 fvdl 1239:
1240: /*
1.48 yamt 1241: * osyscall()
1242: *
1.1 fvdl 1243: * Old call gate entry for syscall
1244: */
1245: IDTVEC(osyscall)
1.87 ad 1246: #ifndef XEN
1247: /* XXX we are in trouble! interrupts be off here. */
1.115 maxv 1248: cli /* must be first instruction */
1.87 ad 1249: #endif
1.115 maxv 1250: pushfl /* set eflags in trap frame */
1.1 fvdl 1251: popl 8(%esp)
1.115 maxv 1252: orl $PSL_I,8(%esp) /* re-enable ints on return to user */
1253: pushl $7 /* size of instruction for restart */
1.1 fvdl 1254: jmp syscall1
1.72 yamt 1255: IDTVEC_END(osyscall)
1.1 fvdl 1256:
1257: /*
1.48 yamt 1258: * syscall()
1259: *
1.1 fvdl 1260: * Trap gate entry for syscall
1261: */
1262: IDTVEC(syscall)
1.115 maxv 1263: pushl $2 /* size of instruction for restart */
1.1 fvdl 1264: syscall1:
1.115 maxv 1265: pushl $T_ASTFLT /* trap # for doing ASTs */
1.1 fvdl 1266: INTRENTRY
1.85 ad 1267: STI(%eax)
1.1 fvdl 1268: #ifdef DIAGNOSTIC
1269: movl CPUVAR(ILEVEL),%ebx
1270: testl %ebx,%ebx
1271: jz 1f
1272: pushl $5f
1.84 ad 1273: call _C_LABEL(panic)
1.1 fvdl 1274: addl $4,%esp
1275: #ifdef DDB
1276: int $3
1277: #endif
1.30 junyoung 1278: 1:
1.1 fvdl 1279: #endif /* DIAGNOSTIC */
1.115 maxv 1280: addl $1,CPUVAR(NSYSCALL) /* count it atomically */
1281: adcl $0,CPUVAR(NSYSCALL)+4 /* count it atomically */
1.68 ad 1282: movl CPUVAR(CURLWP),%edi
1283: movl L_PROC(%edi),%edx
1.115 maxv 1284: movl %esp,L_MD_REGS(%edi) /* save pointer to frame */
1.15 fvdl 1285: pushl %esp
1.115 maxv 1286: call *P_MD_SYSCALL(%edx) /* get pointer to syscall() function */
1.15 fvdl 1287: addl $4,%esp
1.27 yamt 1288: .Lsyscall_checkast:
1.24 yamt 1289: /* Check for ASTs on exit to user mode. */
1.62 bouyer 1290: CLI(%eax)
1.68 ad 1291: movl L_MD_ASTPENDING(%edi), %eax
1292: orl CPUVAR(WANT_PMAPLOAD), %eax
1.24 yamt 1293: jnz 9f
1.62 bouyer 1294: #ifdef XEN
1295: STIC(%eax)
1296: jz 14f
1297: call _C_LABEL(stipending)
1298: testl %eax,%eax
1299: jz 14f
1300: /* process pending interrupts */
1301: CLI(%eax)
1302: movl CPUVAR(ILEVEL), %ebx
1.115 maxv 1303: movl $.Lsyscall_resume, %esi /* address to resume loop at */
1.62 bouyer 1304: .Lsyscall_resume:
1.115 maxv 1305: movl %ebx,%eax /* get cpl */
1.62 bouyer 1306: movl CPUVAR(IUNMASK)(,%eax,4),%eax
1.115 maxv 1307: andl CPUVAR(IPENDING),%eax /* any non-masked bits left? */
1.62 bouyer 1308: jz 17f
1309: bsrl %eax,%eax
1310: btrl %eax,CPUVAR(IPENDING)
1311: movl CPUVAR(ISOURCES)(,%eax,4),%eax
1312: jmp *IS_RESUME(%eax)
1.115 maxv 1313: 17: movl %ebx, CPUVAR(ILEVEL) /* restore cpl */
1.62 bouyer 1314: jmp .Lsyscall_checkast
1315: 14:
1316: #endif /* XEN */
1.1 fvdl 1317: #ifndef DIAGNOSTIC
1.24 yamt 1318: INTRFASTEXIT
1.1 fvdl 1319: #else /* DIAGNOSTIC */
1.24 yamt 1320: cmpl $IPL_NONE,CPUVAR(ILEVEL)
1.1 fvdl 1321: jne 3f
1322: INTRFASTEXIT
1.62 bouyer 1323: 3: STI(%eax)
1.1 fvdl 1324: pushl $4f
1.84 ad 1325: call _C_LABEL(panic)
1.1 fvdl 1326: addl $4,%esp
1.58 ad 1327: pushl $IPL_NONE
1328: call _C_LABEL(spllower)
1329: addl $4,%esp
1.53 yamt 1330: jmp .Lsyscall_checkast
1.84 ad 1331: 4: .asciz "SPL NOT LOWERED ON SYSCALL EXIT\n"
1332: 5: .asciz "SPL NOT ZERO ON SYSCALL ENTRY\n"
1.1 fvdl 1333: #endif /* DIAGNOSTIC */
1.68 ad 1334: 9:
1335: cmpl $0, CPUVAR(WANT_PMAPLOAD)
1336: jz 10f
1337: STI(%eax)
1.24 yamt 1338: call _C_LABEL(pmap_load)
1.27 yamt 1339: jmp .Lsyscall_checkast /* re-check ASTs */
1.68 ad 1340: 10:
1341: /* Always returning to user mode here. */
1342: movl $0, L_MD_ASTPENDING(%edi)
1343: STI(%eax)
1344: /* Pushed T_ASTFLT into tf_trapno on entry. */
1345: pushl %esp
1346: call _C_LABEL(trap)
1347: addl $4,%esp
1348: jmp .Lsyscall_checkast /* re-check ASTs */
1.72 yamt 1349: IDTVEC_END(syscall)
1.1 fvdl 1350:
1.81 ad 1351: IDTVEC(svr4_fasttrap)
1.115 maxv 1352: pushl $2 /* size of instruction for restart */
1353: pushl $T_ASTFLT /* trap # for doing ASTs */
1.81 ad 1354: INTRENTRY
1.85 ad 1355: STI(%eax)
1.81 ad 1356: pushl $RW_READER
1357: pushl $_C_LABEL(svr4_fasttrap_lock)
1358: call _C_LABEL(rw_enter)
1359: addl $8,%esp
1360: call *_C_LABEL(svr4_fasttrap_vec)
1361: pushl $_C_LABEL(svr4_fasttrap_lock)
1362: call _C_LABEL(rw_exit)
1363: addl $4,%esp
1364: 2: /* Check for ASTs on exit to user mode. */
1365: cli
1.115 maxv 1366: CHECK_ASTPENDING(%eax)
1.81 ad 1367: je 1f
1368: /* Always returning to user mode here. */
1369: CLEAR_ASTPENDING(%eax)
1370: sti
1371: /* Pushed T_ASTFLT into tf_trapno on entry. */
1372: pushl %esp
1373: call _C_LABEL(trap)
1374: addl $4,%esp
1375: jmp 2b
1376: 1: CHECK_DEFERRED_SWITCH
1377: jnz 9f
1378: INTRFASTEXIT
1379: 9: sti
1380: call _C_LABEL(pmap_load)
1381: cli
1382: jmp 2b
1383:
1.48 yamt 1384: /*
1385: * int npx586bug1(int a, int b)
1.110 dsl 1386: * Used when checking for the FDIV bug on first generations pentiums.
1387: * Anything 120MHz or above is fine.
1.48 yamt 1388: */
1.1 fvdl 1389: NENTRY(npx586bug1)
1.115 maxv 1390: fildl 4(%esp) /* x */
1391: fildl 8(%esp) /* y */
1.1 fvdl 1392: fld %st(1)
1.115 maxv 1393: fdiv %st(1),%st /* x/y */
1394: fmulp %st,%st(1) /* (x/y)*y */
1395: fsubrp %st,%st(1) /* x-(x/y)*y */
1.1 fvdl 1396: pushl $0
1397: fistpl (%esp)
1398: popl %eax
1399: ret
1.72 yamt 1400: END(npx586bug1)
1.50 ad 1401:
1402: /*
1.76 ad 1403: * void sse2_idlezero_page(void *pg)
1.50 ad 1404: *
1.76 ad 1405: * Zero a page without polluting the cache. Preemption must be
1406: * disabled by the caller. Abort if a preemption is pending.
1.50 ad 1407: */
1.76 ad 1408: ENTRY(sse2_idlezero_page)
1.50 ad 1409: pushl %ebp
1410: movl %esp,%ebp
1411: movl 8(%esp), %edx
1.76 ad 1412: movl $(PAGE_SIZE/32), %ecx
1.50 ad 1413: xorl %eax, %eax
1414: .align 16
1415: 1:
1.82 ad 1416: testl $RESCHED_KPREEMPT, CPUVAR(RESCHED)
1.76 ad 1417: jnz 2f
1.50 ad 1418: movnti %eax, 0(%edx)
1419: movnti %eax, 4(%edx)
1420: movnti %eax, 8(%edx)
1421: movnti %eax, 12(%edx)
1422: movnti %eax, 16(%edx)
1423: movnti %eax, 20(%edx)
1424: movnti %eax, 24(%edx)
1425: movnti %eax, 28(%edx)
1.76 ad 1426: addl $32, %edx
1.75 ad 1427: decl %ecx
1.50 ad 1428: jnz 1b
1429: sfence
1.76 ad 1430: incl %eax
1.50 ad 1431: pop %ebp
1432: ret
1.76 ad 1433: 2:
1.50 ad 1434: sfence
1435: popl %ebp
1436: ret
1.76 ad 1437: END(sse2_idlezero_page)
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