mpboot.s

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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: releng/5.1/sys/i386/i386/mpboot.s 112841 2003-03-30 05:24:52Z jake $
   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    R(IdlePDPT), %eax
   81         movl    %eax, %cr3
   82         movl    %cr4, %eax
   83         orl     $CR4_PAE, %eax
   84         movl    %eax, %cr4
   85 #else
   86         movl    R(IdlePTD), %eax
   87         movl    %eax,%cr3       
   88 #endif
   89         movl    %cr0,%eax
   90         orl     $CR0_PE|CR0_PG,%eax             /* enable paging */
   91         movl    %eax,%cr0                       /* let the games begin! */
   92         movl    bootSTK,%esp                    /* boot stack end loc. */
   93 
   94         pushl   $mp_begin                       /* jump to high mem */
   95         ret
   96 
   97         /*
   98          * Wait for the booting CPU to signal startup
   99          */
  100 mp_begin:       /* now running relocated at KERNBASE */
  101         CHECKPOINT(0x37, 4)
  102         call    init_secondary                  /* load i386 tables */
  103         CHECKPOINT(0x38, 5)
  104 
  105         /*
  106          * If the [BSP] CPU has support for VME, turn it on.
  107          */
  108         testl   $CPUID_VME, cpu_feature         /* XXX WRONG! BSP! */
  109         jz      1f
  110         movl    %cr4, %eax
  111         orl     $CR4_VME, %eax
  112         movl    %eax, %cr4
  113 1:
  114 
  115         /* disable the APIC, just to be SURE */
  116         movl    lapic+LA_SVR, %eax              /* get spurious vector reg. */
  117         andl    $~APIC_SVR_SWEN, %eax           /* clear software enable bit */
  118         movl    %eax, lapic+LA_SVR
  119 
  120         /* signal our startup to the BSP */
  121         movl    lapic+LA_VER, %eax              /* our version reg contents */
  122         movl    %eax, cpu_apic_versions         /* into [ 0 ] */
  123         incl    mp_ncpus                        /* signal BSP */
  124 
  125         CHECKPOINT(0x39, 6)
  126 
  127         /* Now, let's prepare for some REAL WORK :-)  This doesn't return. */
  128         call    ap_init
  129 
  130 /*
  131  * This is the embedded trampoline or bootstrap that is
  132  * copied into 'real-mode' low memory, it is where the
  133  * secondary processor "wakes up". When it is executed
  134  * the processor will eventually jump into the routine
  135  * MPentry, which resides in normal kernel text above
  136  * 1Meg.                -jackv
  137  */
  138 
  139         .data
  140         ALIGN_DATA                              /* just to be sure */
  141 
  142 BOOTMP1:
  143 
  144 NON_GPROF_ENTRY(bootMP)
  145         .code16         
  146         cli
  147         CHECKPOINT(0x34, 1)
  148         /* First guarantee a 'clean slate' */
  149         xorl    %eax, %eax
  150         movl    %eax, %ebx
  151         movl    %eax, %ecx
  152         movl    %eax, %edx
  153         movl    %eax, %esi
  154         movl    %eax, %edi
  155 
  156         /* set up data segments */
  157         mov     %cs, %ax
  158         mov     %ax, %ds
  159         mov     %ax, %es
  160         mov     %ax, %fs
  161         mov     %ax, %gs
  162         mov     %ax, %ss
  163         mov     $(boot_stk-bootMP), %esp
  164 
  165         /* Now load the global descriptor table */
  166         lgdt    MP_GDTptr-bootMP
  167 
  168         /* Enable protected mode */
  169         movl    %cr0, %eax
  170         orl     $CR0_PE, %eax
  171         movl    %eax, %cr0 
  172 
  173         /*
  174          * make intrasegment jump to flush the processor pipeline and
  175          * reload CS register
  176          */
  177         pushl   $0x18
  178         pushl   $(protmode-bootMP)
  179         lretl
  180 
  181        .code32          
  182 protmode:
  183         CHECKPOINT(0x35, 2)
  184 
  185         /*
  186          * we are NOW running for the first time with %eip
  187          * having the full physical address, BUT we still
  188          * are using a segment descriptor with the origin
  189          * not matching the booting kernel.
  190          *
  191          * SO NOW... for the BIG Jump into kernel's segment
  192          * and physical text above 1 Meg.
  193          */
  194         mov     $0x10, %ebx
  195         movw    %bx, %ds
  196         movw    %bx, %es
  197         movw    %bx, %fs
  198         movw    %bx, %gs
  199         movw    %bx, %ss
  200 
  201         .globl  bigJump
  202 bigJump:
  203         /* this will be modified by mpInstallTramp() */
  204         ljmp    $0x08, $0                       /* far jmp to MPentry() */
  205         
  206 dead:   hlt /* We should never get here */
  207         jmp     dead
  208 
  209 /*
  210  * MP boot strap Global Descriptor Table
  211  */
  212         .p2align 4
  213         .globl  MP_GDT
  214         .globl  bootCodeSeg
  215         .globl  bootDataSeg
  216 MP_GDT:
  217 
  218 nulldesc:               /* offset = 0x0 */
  219 
  220         .word   0x0     
  221         .word   0x0     
  222         .byte   0x0     
  223         .byte   0x0     
  224         .byte   0x0     
  225         .byte   0x0     
  226 
  227 kernelcode:             /* offset = 0x08 */
  228 
  229         .word   0xffff  /* segment limit 0..15 */
  230         .word   0x0000  /* segment base 0..15 */
  231         .byte   0x0     /* segment base 16..23; set for 0K */
  232         .byte   0x9f    /* flags; Type  */
  233         .byte   0xcf    /* flags; Limit */
  234         .byte   0x0     /* segment base 24..32 */
  235 
  236 kerneldata:             /* offset = 0x10 */
  237 
  238         .word   0xffff  /* segment limit 0..15 */
  239         .word   0x0000  /* segment base 0..15 */
  240         .byte   0x0     /* segment base 16..23; set for 0k */
  241         .byte   0x93    /* flags; Type  */
  242         .byte   0xcf    /* flags; Limit */
  243         .byte   0x0     /* segment base 24..32 */
  244 
  245 bootcode:               /* offset = 0x18 */
  246 
  247         .word   0xffff  /* segment limit 0..15 */
  248 bootCodeSeg:            /* this will be modified by mpInstallTramp() */
  249         .word   0x0000  /* segment base 0..15 */
  250         .byte   0x00    /* segment base 16...23; set for 0x000xx000 */
  251         .byte   0x9e    /* flags; Type  */
  252         .byte   0xcf    /* flags; Limit */
  253         .byte   0x0     /*segment base 24..32 */
  254 
  255 bootdata:               /* offset = 0x20 */
  256 
  257         .word   0xffff  
  258 bootDataSeg:            /* this will be modified by mpInstallTramp() */
  259         .word   0x0000  /* segment base 0..15 */
  260         .byte   0x00    /* segment base 16...23; set for 0x000xx000 */
  261         .byte   0x92    
  262         .byte   0xcf    
  263         .byte   0x0             
  264 
  265 /*
  266  * GDT pointer for the lgdt call
  267  */
  268         .globl  mp_gdtbase
  269 
  270 MP_GDTptr:      
  271 mp_gdtlimit:
  272         .word   0x0028          
  273 mp_gdtbase:             /* this will be modified by mpInstallTramp() */
  274         .long   0
  275 
  276         .space  0x100   /* space for boot_stk - 1st temporary stack */
  277 boot_stk:
  278 
  279 BOOTMP2:
  280         .globl  bootMP_size
  281 bootMP_size:
  282         .long   BOOTMP2 - BOOTMP1

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FreeBSD/Linux Kernel Cross Reference sys/i386/i386/mpboot.s

FreeBSD/Linux Kernel Cross Reference
sys/i386/i386/mpboot.s