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Annotation of kernel/machdep/i386/bios_asm.s, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
        !             7:  * Reserved.  This file contains Original Code and/or Modifications of
        !             8:  * Original Code as defined in and that are subject to the Apple Public
        !             9:  * Source License Version 1.1 (the "License").  You may not use this file
        !            10:  * except in compliance with the License.  Please obtain a copy of the
        !            11:  * License at http://www.apple.com/publicsource and read it before using
        !            12:  * this file.
        !            13:  * 
        !            14:  * The Original Code and all software distributed under the License are
        !            15:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            19:  * License for the specific language governing rights and limitations
        !            20:  * under the License.
        !            21:  * 
        !            22:  * @APPLE_LICENSE_HEADER_END@
        !            23:  */
        !            24: 
        !            25: /*
        !            26:  * Copyright 1993 NeXT Computer, Inc.
        !            27:  * All rights reserved.
        !            28:  *
        !            29:  * Harness for calling protected-mode BIOS functions.
        !            30:  */
        !            31: 
        !            32: #import <machdep/i386/asm.h>
        !            33: #import <assym.h>
        !            34: 
        !            35: #define data32 .byte 0x66
        !            36: #define addr32 .byte 0x67
        !            37: 
        !            38: #define O_INT  0
        !            39: #define O_EAX  4
        !            40: #define O_EBX  8
        !            41: #define O_ECX  12
        !            42: #define O_EDX  16
        !            43: #define O_EDI  20
        !            44: #define O_ESI  24
        !            45: #define O_EBP  28
        !            46: #define O_CS   32
        !            47: #define O_DS   34
        !            48: #define O_ES   36
        !            49: #define O_FLG  40
        !            50: #define O_ADDR 44
        !            51: 
        !            52: .data
        !            53: .align 2
        !            54: save_es:
        !            55:        .long 0
        !            56: save_eax:
        !            57:        .long 0
        !            58: save_edx:
        !            59:        .long 0
        !            60: save_flag:
        !            61:        .long 0
        !            62: new_eax:
        !            63:        .long 0
        !            64: new_edx:
        !            65:        .long 0
        !            66: 
        !            67: .text  
        !            68: ENTRY(_bios32)
        !            69:        enter   $0,$0
        !            70:        pushal
        !            71:        push %es
        !            72:        push %fs
        !            73:        push %gs
        !            74:        pushf
        !            75:        
        !            76:        movl    8(%ebp), %edx           // address of save area
        !            77:        
        !            78:        movw    O_CS(%edx), %ax
        !            79:        movw    %ax, save_seg
        !            80:        movl    O_ADDR(%edx), %eax
        !            81:        movl    %eax, save_addr
        !            82:        movl    O_EBX(%edx), %ebx
        !            83:        movl    O_ECX(%edx), %ecx
        !            84:        movl    O_EDI(%edx), %edi
        !            85:        movl    O_ESI(%edx), %esi
        !            86:        movl    O_EBP(%edx), %ebp
        !            87:        movl    %edx, save_edx
        !            88:        movl    O_EAX(%edx), %eax
        !            89:        movl    %eax, new_eax
        !            90:        movl    O_EDX(%edx), %eax
        !            91:        movl    %eax, new_edx
        !            92:        movw    O_DS(%edx), %ax
        !            93:        pushw   %ax
        !            94: 
        !            95:        movl    new_eax, %eax
        !            96:        mov     new_edx, %edx
        !            97:        popw    %ds
        !            98: 
        !            99:        cli
        !           100:        .byte   0x9A                    // far jmp
        !           101: save_addr:
        !           102:        .long 0
        !           103: save_seg:
        !           104:        .word 0
        !           105: 
        !           106:        pushf
        !           107:        mov     $KDSSEL, %eax
        !           108:        mov     %ax, %ds
        !           109: 
        !           110: 
        !           111:        movl    %eax, save_eax
        !           112:        popl    %eax
        !           113:        movw    %ax, save_flag
        !           114:        movw    %es, %ax
        !           115:        movw    %ax, save_es
        !           116:        
        !           117:        movl    %edx, new_edx           // save new edx before clobbering
        !           118:        movl    save_edx, %edx
        !           119:        movl    new_edx, %eax           // now move it into buffer
        !           120:        movl    %eax, O_EDX(%edx)
        !           121:        movl    save_eax, %eax
        !           122:        movl    %eax, O_EAX(%edx)
        !           123:        movw    save_es, %ax
        !           124:        movw    %ax, O_ES(%edx)
        !           125:        movw    save_flag, %ax
        !           126:        movw    %ax, O_FLG(%edx)
        !           127:        movl    %ebx, O_EBX(%edx)
        !           128:        movl    %ecx, O_ECX(%edx)
        !           129:        movl    %edi, O_EDI(%edx)
        !           130:        movl    %esi, O_ESI(%edx)
        !           131:        movl    %ebp, O_EBP(%edx)
        !           132: 
        !           133:        popf
        !           134:        pop %gs
        !           135:        pop %fs
        !           136:        pop %es
        !           137:        
        !           138:        popal
        !           139:        leave
        !           140:        
        !           141:        ret
        !           142:        
        !           143:        

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