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Annotation of sys/arch/i386/stand/boot/srt0.S, Revision 1.1

1.1     ! nbrk        1: /*     $OpenBSD: srt0.S,v 1.14 2003/11/22 09:18:25 grange Exp $        */
        !             2:
        !             3: /*
        !             4:  * Copyright (c) 1997 Michael Shalayeff
        !             5:  * All rights reserved.
        !             6:  *
        !             7:  * Redistribution and use in source and binary forms, with or without
        !             8:  * modification, are permitted provided that the following conditions
        !             9:  * are met:
        !            10:  * 1. Redistributions of source code must retain the above copyright
        !            11:  *    notice, this list of conditions and the following disclaimer.
        !            12:  * 2. Redistributions in binary form must reproduce the above copyright
        !            13:  *    notice, this list of conditions and the following disclaimer in the
        !            14:  *    documentation and/or other materials provided with the distribution.
        !            15:  *
        !            16:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
        !            17:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
        !            18:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            19:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            20:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            21:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            22:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            23:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            24:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            25:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            26:  * SUCH DAMAGE.
        !            27:  *
        !            28:  */
        !            29: #include <machine/asm.h>
        !            30: #include <assym.h>
        !            31:
        !            32: #define BOOTSTACK 0xfffc
        !            33:
        !            34:        .globl  _C_LABEL(end)
        !            35:        .globl  _C_LABEL(edata)
        !            36:        .globl  _C_LABEL(boot)
        !            37:        .globl  _C_LABEL(_rtt)
        !            38:        .globl  _C_LABEL(bios_bootdev)
        !            39:        .globl  _ASM_LABEL(pmm_init)
        !            40:        .globl  Gdtr
        !            41:
        !            42:        .text
        !            43:        .code16
        !            44:        .globl  _start
        !            45: _start:
        !            46:        popl %eax
        !            47:        cmpl $BOOTMAGIC, %eax
        !            48:        je      1f
        !            49: #ifdef DEBUG
        !            50:        movl    $0xb80a0, %ebx
        !            51:        addr32 movl $0x07420742, (%ebx)
        !            52: #endif
        !            53: 1:
        !            54:        popl %edx
        !            55:        cli
        !            56:        pushl   %cs
        !            57:        popl    %ds
        !            58:        addr32 data32 lgdt      (Gdtr - LINKADDR)
        !            59:        movl    %cr0, %eax
        !            60:        orl $CR0_PE, %eax
        !            61:        data32 movl %eax, %cr0
        !            62:        data32 ljmp $8, $1f
        !            63: 1:
        !            64:        .code32
        !            65:        movl    $0x10,%eax
        !            66:        mov     %ax,%ds
        !            67:        mov     %ax,%ss
        !            68:        mov     %ax,%es
        !            69:        mov     %ax,%fs
        !            70:        mov     %ax,%gs
        !            71:        movl    $BOOTSTACK,%esp
        !            72:        pushl   %edx
        !            73:        movl    %edx, _C_LABEL(bios_bootdev)
        !            74:
        !            75:        /* Now do it all */
        !            76:        call    _ASM_LABEL(pmm_init)
        !            77: #ifdef DEBUG
        !            78:        movl    $0xb80a4, %ebx
        !            79:        movl    $0x07520752, (%ebx)
        !            80: #endif
        !            81:        /* zero .bss */
        !            82:        xorl    %eax, %eax
        !            83:        movl    $_C_LABEL(end), %ecx
        !            84:        subl    $_C_LABEL(edata),%ecx
        !            85:        movl    $_C_LABEL(edata), %edi
        !            86:        cld
        !            87:        rep;    stosb
        !            88:
        !            89:        call    _C_LABEL(boot)
        !            90:
        !            91:        jmp     _C_LABEL(_rtt)
        !            92: