Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/i386/i386/mpboot.s
Version:
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1 /* 2 * Copyright (c) 1995, Jack F. Vogel 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by Jack F. Vogel 16 * 4. The name of the developer may be used to endorse or promote products 17 * derived from this software without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * mpboot.s: FreeBSD machine support for the Intel MP Spec 32 * multiprocessor systems. 33 * 34 * $FreeBSD$ 35 */ 36 37 #include "opt_vm86.h" 38 39 #include <machine/asmacros.h> /* miscellaneous asm macros */ 40 #include <machine/apic.h> 41 #include <machine/specialreg.h> 42 43 #include "assym.s" 44 45 /* 46 * this code MUST be enabled here and in mp_machdep.c 47 * it follows the very early stages of AP boot by placing values in CMOS ram. 48 * it NORMALLY will never be needed and thus the primitive method for enabling. 49 * 50 #define CHECK_POINTS 51 */ 52 53 #if defined(CHECK_POINTS) && !defined(PC98) 54 55 #define CMOS_REG (0x70) 56 #define CMOS_DATA (0x71) 57 58 #define CHECKPOINT(A,D) \ 59 movb $(A),%al ; \ 60 outb %al,$CMOS_REG ; \ 61 movb $(D),%al ; \ 62 outb %al,$CMOS_DATA 63 64 #else 65 66 #define CHECKPOINT(A,D) 67 68 #endif /* CHECK_POINTS */ 69 70 71 /* 72 * the APs enter here from their trampoline code (bootMP, below) 73 */ 74 .p2align 4 75 76 NON_GPROF_ENTRY(MPentry) 77 CHECKPOINT(0x36, 3) 78 /* Now enable paging mode */ 79 movl _bootPTD-KERNBASE, %eax 80 movl %eax,%cr3 81 movl %cr0,%eax 82 orl $CR0_PE|CR0_PG,%eax /* enable paging */ 83 movl %eax,%cr0 /* let the games begin! */ 84 movl $_idlestack_top,%esp /* boot stack end loc. */ 85 86 pushl $mp_begin /* jump to high mem */ 87 ret 88 89 /* 90 * Wait for the booting CPU to signal startup 91 */ 92 mp_begin: /* now running relocated at KERNBASE */ 93 CHECKPOINT(0x37, 4) 94 call _init_secondary /* load i386 tables */ 95 CHECKPOINT(0x38, 5) 96 97 #ifdef VM86 98 /* 99 * If the [BSP] CPU has support for VME, turn it on. 100 */ 101 testl $CPUID_VME, _cpu_feature /* XXX WRONG! BSP! */ 102 jz 1f 103 movl %cr4, %eax 104 orl $CR4_VME, %eax 105 movl %eax, %cr4 106 1: 107 #endif 108 109 /* disable the APIC, just to be SURE */ 110 movl lapic_svr, %eax /* get spurious vector reg. */ 111 andl $~APIC_SVR_SWEN, %eax /* clear software enable bit */ 112 movl %eax, lapic_svr 113 114 /* signal our startup to the BSP */ 115 movl lapic_ver, %eax /* our version reg contents */ 116 movl %eax, _cpu_apic_versions /* into [ 0 ] */ 117 incl _mp_ncpus /* signal BSP */ 118 119 CHECKPOINT(0x39, 6) 120 121 /* wait till we can get into the kernel */ 122 call _boot_get_mplock 123 124 /* Now, let's prepare for some REAL WORK :-) */ 125 call _ap_init 126 127 call _rel_mplock 128 2: 129 cmpl $0, CNAME(smp_started) /* Wait for last AP to be ready */ 130 jz 2b 131 call _get_mplock 132 133 /* let her rip! (loads new stack) */ 134 jmp _cpu_switch 135 136 /* 137 * This is the embedded trampoline or bootstrap that is 138 * copied into 'real-mode' low memory, it is where the 139 * secondary processor "wakes up". When it is executed 140 * the processor will eventually jump into the routine 141 * MPentry, which resides in normal kernel text above 142 * 1Meg. -jackv 143 */ 144 145 #define data32 .byte 0x66 146 #define addr32 .byte 0x67 147 148 .data 149 ALIGN_DATA /* just to be sure */ 150 151 BOOTMP1: 152 153 NON_GPROF_ENTRY(bootMP) 154 cli 155 CHECKPOINT(0x34, 1) 156 /* First guarantee a 'clean slate' */ 157 data32 158 xorl %eax, %eax 159 data32 160 movl %eax, %ebx 161 data32 162 movl %eax, %ecx 163 data32 164 movl %eax, %edx 165 data32 166 movl %eax, %esi 167 data32 168 movl %eax, %edi 169 170 /* set up data segments */ 171 mov %cs, %ax 172 mov %ax, %ds 173 mov %ax, %es 174 mov %ax, %fs 175 mov %ax, %gs 176 mov %ax, %ss 177 data32 178 mov $boot_stk-_bootMP, %esp 179 180 /* Now load the global descriptor table */ 181 addr32 182 data32 183 /* XXX: sigh: lgdt MP_GDTptr-_bootMP GAS BUG! */ 184 .byte 0x0f, 0x01, 0x15 /* XXX hand assemble! */ 185 .long MP_GDTptr-_bootMP /* XXX hand assemble! */ 186 187 /* Enable protected mode */ 188 data32 189 movl %cr0, %eax 190 data32 191 orl $CR0_PE, %eax 192 data32 193 movl %eax, %cr0 194 195 /* 196 * make intrasegment jump to flush the processor pipeline and 197 * reload CS register 198 */ 199 data32 200 pushl $0x18 201 data32 202 pushl $(protmode-_bootMP) 203 data32 204 lret 205 206 protmode: 207 CHECKPOINT(0x35, 2) 208 209 /* 210 * we are NOW running for the first time with %eip 211 * having the full physical address, BUT we still 212 * are using a segment descriptor with the origin 213 * not matching the booting kernel. 214 * 215 * SO NOW... for the BIG Jump into kernel's segment 216 * and physical text above 1 Meg. 217 */ 218 mov $0x10, %ebx 219 movw %bx, %ds 220 movw %bx, %es 221 movw %bx, %fs 222 movw %bx, %gs 223 movw %bx, %ss 224 225 .globl _bigJump 226 _bigJump: 227 /* this will be modified by mpInstallTramp() */ 228 ljmp $0x08, $0 /* far jmp to MPentry() */ 229 230 dead: hlt /* We should never get here */ 231 jmp dead 232 233 /* 234 * MP boot strap Global Descriptor Table 235 */ 236 .p2align 4 237 .globl _MP_GDT 238 .globl _bootCodeSeg 239 .globl _bootDataSeg 240 _MP_GDT: 241 242 nulldesc: /* offset = 0x0 */ 243 244 .word 0x0 245 .word 0x0 246 .byte 0x0 247 .byte 0x0 248 .byte 0x0 249 .byte 0x0 250 251 kernelcode: /* offset = 0x08 */ 252 253 .word 0xffff /* segment limit 0..15 */ 254 .word 0x0000 /* segment base 0..15 */ 255 .byte 0x0 /* segment base 16..23; set for 0K */ 256 .byte 0x9f /* flags; Type */ 257 .byte 0xcf /* flags; Limit */ 258 .byte 0x0 /* segment base 24..32 */ 259 260 kerneldata: /* offset = 0x10 */ 261 262 .word 0xffff /* segment limit 0..15 */ 263 .word 0x0000 /* segment base 0..15 */ 264 .byte 0x0 /* segment base 16..23; set for 0k */ 265 .byte 0x93 /* flags; Type */ 266 .byte 0xcf /* flags; Limit */ 267 .byte 0x0 /* segment base 24..32 */ 268 269 bootcode: /* offset = 0x18 */ 270 271 .word 0xffff /* segment limit 0..15 */ 272 _bootCodeSeg: /* this will be modified by mpInstallTramp() */ 273 .word 0x0000 /* segment base 0..15 */ 274 .byte 0x00 /* segment base 16...23; set for 0x000xx000 */ 275 .byte 0x9e /* flags; Type */ 276 .byte 0xcf /* flags; Limit */ 277 .byte 0x0 /*segment base 24..32 */ 278 279 bootdata: /* offset = 0x20 */ 280 281 .word 0xffff 282 _bootDataSeg: /* this will be modified by mpInstallTramp() */ 283 .word 0x0000 /* segment base 0..15 */ 284 .byte 0x00 /* segment base 16...23; set for 0x000xx000 */ 285 .byte 0x92 286 .byte 0xcf 287 .byte 0x0 288 289 /* 290 * GDT pointer for the lgdt call 291 */ 292 .globl _mp_gdtbase 293 294 MP_GDTptr: 295 _mp_gdtlimit: 296 .word 0x0028 297 _mp_gdtbase: /* this will be modified by mpInstallTramp() */ 298 .long 0 299 300 .space 0x100 /* space for boot_stk - 1st temporary stack */ 301 boot_stk: 302 303 BOOTMP2: 304 .globl _bootMP_size 305 _bootMP_size: 306 .long BOOTMP2 - BOOTMP1
Cache object: 3123c78eb1a04a3f04071dfd8971c768
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