2 * Copyright (c) 1995, Jack F. Vogel
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
31 * mpboot.s: FreeBSD machine support for the Intel MP Spec
32 * multiprocessor systems.
39 #include <machine/asmacros.h> /* miscellaneous asm macros */
40 #include <machine/apicreg.h>
41 #include <machine/specialreg.h>
45 #define R(x) ((x)-KERNBASE)
48 * this code MUST be enabled here and in mp_machdep.c
49 * it follows the very early stages of AP boot by placing values in CMOS ram.
50 * it NORMALLY will never be needed and thus the primitive method for enabling.
55 #if defined(CHECK_POINTS) && !defined(PC98)
57 #define CMOS_REG (0x70)
58 #define CMOS_DATA (0x71)
60 #define CHECKPOINT(A,D) \
62 outb %al,$CMOS_REG ; \
68 #define CHECKPOINT(A,D)
70 #endif /* CHECK_POINTS */
74 * the APs enter here from their trampoline code (bootMP, below)
78 NON_GPROF_ENTRY(MPentry)
81 * Enable features on this processor. We don't support SMP on
82 * CPUs older than a Pentium, so we know that we can use the cpuid
86 cpuid /* Retrieve features */
91 orl $CR4_PSE,%eax /* Enable PSE */
97 orl $CR4_PGE,%eax /* Enable PGE */
100 testl $CPUID_VME,%edx
102 orl $CR4_VME,%eax /* Enable VME */
106 /* Now enable paging mode */
108 movl R(IdlePDPT), %eax
114 movl R(IdlePTD), %eax
118 orl $CR0_PE|CR0_PG,%eax /* enable paging */
119 movl %eax,%cr0 /* let the games begin! */
120 movl bootSTK,%esp /* boot stack end loc. */
122 pushl $mp_begin /* jump to high mem */
126 * Wait for the booting CPU to signal startup
128 mp_begin: /* now running relocated at KERNBASE */
130 call init_secondary /* load i386 tables */
133 * This is the embedded trampoline or bootstrap that is
134 * copied into 'real-mode' low memory, it is where the
135 * secondary processor "wakes up". When it is executed
136 * the processor will eventually jump into the routine
137 * MPentry, which resides in normal kernel text above
142 ALIGN_DATA /* just to be sure */
146 NON_GPROF_ENTRY(bootMP)
150 /* First guarantee a 'clean slate' */
158 /* set up data segments */
165 mov $(boot_stk-bootMP), %esp
167 /* Now load the global descriptor table */
168 lgdt MP_GDTptr-bootMP
170 /* Enable protected mode */
176 * make intrasegment jump to flush the processor pipeline and
180 pushl $(protmode-bootMP)
188 * we are NOW running for the first time with %eip
189 * having the full physical address, BUT we still
190 * are using a segment descriptor with the origin
191 * not matching the booting kernel.
193 * SO NOW... for the BIG Jump into kernel's segment
194 * and physical text above 1 Meg.
205 /* this will be modified by mpInstallTramp() */
206 ljmp $0x08, $0 /* far jmp to MPentry() */
208 dead: hlt /* We should never get here */
212 * MP boot strap Global Descriptor Table
220 nulldesc: /* offset = 0x0 */
229 kernelcode: /* offset = 0x08 */
231 .word 0xffff /* segment limit 0..15 */
232 .word 0x0000 /* segment base 0..15 */
233 .byte 0x0 /* segment base 16..23; set for 0K */
234 .byte 0x9f /* flags; Type */
235 .byte 0xcf /* flags; Limit */
236 .byte 0x0 /* segment base 24..32 */
238 kerneldata: /* offset = 0x10 */
240 .word 0xffff /* segment limit 0..15 */
241 .word 0x0000 /* segment base 0..15 */
242 .byte 0x0 /* segment base 16..23; set for 0k */
243 .byte 0x93 /* flags; Type */
244 .byte 0xcf /* flags; Limit */
245 .byte 0x0 /* segment base 24..32 */
247 bootcode: /* offset = 0x18 */
249 .word 0xffff /* segment limit 0..15 */
250 bootCodeSeg: /* this will be modified by mpInstallTramp() */
251 .word 0x0000 /* segment base 0..15 */
252 .byte 0x00 /* segment base 16...23; set for 0x000xx000 */
253 .byte 0x9e /* flags; Type */
254 .byte 0xcf /* flags; Limit */
255 .byte 0x0 /*segment base 24..32 */
257 bootdata: /* offset = 0x20 */
260 bootDataSeg: /* this will be modified by mpInstallTramp() */
261 .word 0x0000 /* segment base 0..15 */
262 .byte 0x00 /* segment base 16...23; set for 0x000xx000 */
268 * GDT pointer for the lgdt call
275 mp_gdtbase: /* this will be modified by mpInstallTramp() */
278 .space 0x100 /* space for boot_stk - 1st temporary stack */
284 .long BOOTMP2 - BOOTMP1