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 <machine/asmacros.h> /* miscellaneous asm macros */ 38 #include <machine/apic.h> 39 #include <machine/specialreg.h> 40 41 #include "assym.s" 42 43 #define R(x) ((x)-KERNBASE) 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 #ifdef PAE 80 movl %cr4,%eax 81 orl $CR4_PAE,%eax 82 movl %eax,%cr4 83 movl $R(_IdlePDPT),%eax 84 #else 85 movl R(_IdlePTD),%eax 86 #endif 87 movl %eax,%cr3 88 movl %cr0,%eax 89 orl $CR0_PE|CR0_PG,%eax /* enable paging */ 90 movl %eax,%cr0 /* let the games begin! */ 91 movl _bootSTK,%esp /* boot stack end loc. */ 92 93 pushl $mp_begin /* jump to high mem */ 94 ret 95 96 /* 97 * Wait for the booting CPU to signal startup 98 */ 99 mp_begin: /* now running relocated at KERNBASE */ 100 CHECKPOINT(0x37, 4) 101 call _init_secondary /* load i386 tables */ 102 CHECKPOINT(0x38, 5) 103 104 /* 105 * If the [BSP] CPU has support for VME, turn it on. 106 */ 107 testl $CPUID_VME, _cpu_feature /* XXX WRONG! BSP! */ 108 jz 1f 109 movl %cr4, %eax 110 orl $CR4_VME, %eax 111 movl %eax, %cr4 112 1: 113 114 /* disable the APIC, just to be SURE */ 115 movl lapic_svr, %eax /* get spurious vector reg. */ 116 andl $~APIC_SVR_SWEN, %eax /* clear software enable bit */ 117 movl %eax, lapic_svr 118 119 /* signal our startup to the BSP */ 120 movl lapic_ver, %eax /* our version reg contents */ 121 movl %eax, _cpu_apic_versions /* into [ 0 ] */ 122 incl _mp_ncpus /* signal BSP */ 123 124 CHECKPOINT(0x39, 6) 125 126 /* wait till we can get into the kernel */ 127 call _boot_get_mplock 128 129 /* Now, let's prepare for some REAL WORK :-) */ 130 call _ap_init 131 132 call _rel_mplock 133 wbinvd /* Avoid livelock */ 134 2: 135 cmpl $0, CNAME(smp_started) /* Wait for last AP to be ready */ 136 jz 2b 137 call _get_mplock 138 139 /* let her rip! (loads new stack) */ 140 jmp _cpu_switch 141 142 NON_GPROF_ENTRY(wait_ap) 143 pushl %ebp 144 movl %esp, %ebp 145 call _rel_mplock 146 wbinvd /* Avoid livelock */ 147 movl %eax, 8(%ebp) 148 1: 149 cmpl $0, CNAME(smp_started) 150 jnz 2f 151 decl %eax 152 cmpl $0, %eax 153 jge 1b 154 2: 155 call _get_mplock 156 movl %ebp, %esp 157 popl %ebp 158 ret 159 160 161 /* 162 * This is the embedded trampoline or bootstrap that is 163 * copied into 'real-mode' low memory, it is where the 164 * secondary processor "wakes up". When it is executed 165 * the processor will eventually jump into the routine 166 * MPentry, which resides in normal kernel text above 167 * 1Meg. -jackv 168 */ 169 170 .data 171 ALIGN_DATA /* just to be sure */ 172 173 BOOTMP1: 174 175 NON_GPROF_ENTRY(bootMP) 176 .code16 177 cli 178 CHECKPOINT(0x34, 1) 179 /* First guarantee a 'clean slate' */ 180 xorl %eax, %eax 181 movl %eax, %ebx 182 movl %eax, %ecx 183 movl %eax, %edx 184 movl %eax, %esi 185 movl %eax, %edi 186 187 /* set up data segments */ 188 mov %cs, %ax 189 mov %ax, %ds 190 mov %ax, %es 191 mov %ax, %fs 192 mov %ax, %gs 193 mov %ax, %ss 194 mov $(boot_stk-_bootMP), %esp 195 196 /* Now load the global descriptor table */ 197 lgdt MP_GDTptr-_bootMP 198 199 /* Enable protected mode */ 200 movl %cr0, %eax 201 orl $CR0_PE, %eax 202 movl %eax, %cr0 203 204 /* 205 * make intrasegment jump to flush the processor pipeline and 206 * reload CS register 207 */ 208 pushl $0x18 209 pushl $(protmode-_bootMP) 210 lretl 211 212 .code32 213 protmode: 214 CHECKPOINT(0x35, 2) 215 216 /* 217 * we are NOW running for the first time with %eip 218 * having the full physical address, BUT we still 219 * are using a segment descriptor with the origin 220 * not matching the booting kernel. 221 * 222 * SO NOW... for the BIG Jump into kernel's segment 223 * and physical text above 1 Meg. 224 */ 225 mov $0x10, %ebx 226 movw %bx, %ds 227 movw %bx, %es 228 movw %bx, %fs 229 movw %bx, %gs 230 movw %bx, %ss 231 232 .globl _bigJump 233 _bigJump: 234 /* this will be modified by mpInstallTramp() */ 235 ljmp $0x08, $0 /* far jmp to MPentry() */ 236 237 dead: hlt /* We should never get here */ 238 jmp dead 239 240 /* 241 * MP boot strap Global Descriptor Table 242 */ 243 .p2align 4 244 .globl _MP_GDT 245 .globl _bootCodeSeg 246 .globl _bootDataSeg 247 _MP_GDT: 248 249 nulldesc: /* offset = 0x0 */ 250 251 .word 0x0 252 .word 0x0 253 .byte 0x0 254 .byte 0x0 255 .byte 0x0 256 .byte 0x0 257 258 kernelcode: /* offset = 0x08 */ 259 260 .word 0xffff /* segment limit 0..15 */ 261 .word 0x0000 /* segment base 0..15 */ 262 .byte 0x0 /* segment base 16..23; set for 0K */ 263 .byte 0x9f /* flags; Type */ 264 .byte 0xcf /* flags; Limit */ 265 .byte 0x0 /* segment base 24..32 */ 266 267 kerneldata: /* offset = 0x10 */ 268 269 .word 0xffff /* segment limit 0..15 */ 270 .word 0x0000 /* segment base 0..15 */ 271 .byte 0x0 /* segment base 16..23; set for 0k */ 272 .byte 0x93 /* flags; Type */ 273 .byte 0xcf /* flags; Limit */ 274 .byte 0x0 /* segment base 24..32 */ 275 276 bootcode: /* offset = 0x18 */ 277 278 .word 0xffff /* segment limit 0..15 */ 279 _bootCodeSeg: /* this will be modified by mpInstallTramp() */ 280 .word 0x0000 /* segment base 0..15 */ 281 .byte 0x00 /* segment base 16...23; set for 0x000xx000 */ 282 .byte 0x9e /* flags; Type */ 283 .byte 0xcf /* flags; Limit */ 284 .byte 0x0 /*segment base 24..32 */ 285 286 bootdata: /* offset = 0x20 */ 287 288 .word 0xffff 289 _bootDataSeg: /* this will be modified by mpInstallTramp() */ 290 .word 0x0000 /* segment base 0..15 */ 291 .byte 0x00 /* segment base 16...23; set for 0x000xx000 */ 292 .byte 0x92 293 .byte 0xcf 294 .byte 0x0 295 296 /* 297 * GDT pointer for the lgdt call 298 */ 299 .globl _mp_gdtbase 300 301 MP_GDTptr: 302 _mp_gdtlimit: 303 .word 0x0028 304 _mp_gdtbase: /* this will be modified by mpInstallTramp() */ 305 .long 0 306 307 .space 0x100 /* space for boot_stk - 1st temporary stack */ 308 boot_stk: 309 310 BOOTMP2: 311 .globl _bootMP_size 312 _bootMP_size: 313 .long BOOTMP2 - BOOTMP1
Cache object: 9cb5cb2974326afcf7755936315de4ec
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