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Diffstat (limited to 'sys/i386/boot/bios.s')
| -rw-r--r-- | sys/i386/boot/bios.s | 326 |
1 files changed, 0 insertions, 326 deletions
diff --git a/sys/i386/boot/bios.s b/sys/i386/boot/bios.s deleted file mode 100644 index d1673a5..0000000 --- a/sys/i386/boot/bios.s +++ /dev/null @@ -1,326 +0,0 @@ -/* - * Ported to boot 386BSD by Julian Elischer (julian@tfs.com) Sept 1992 - * - * Mach Operating System - * Copyright (c) 1992, 1991 Carnegie Mellon University - * All Rights Reserved. - * - * Permission to use, copy, modify and distribute this software and its - * documentation is hereby granted, provided that both the copyright - * notice and this permission notice appear in all copies of the - * software, derivative works or modified versions, and any portions - * thereof, and that both notices appear in supporting documentation. - * - * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" - * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR - * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. - * - * Carnegie Mellon requests users of this software to return to - * - * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU - * School of Computer Science - * Carnegie Mellon University - * Pittsburgh PA 15213-3890 - * - * any improvements or extensions that they make and grant Carnegie Mellon - * the rights to redistribute these changes. - */ - -/* - * HISTORY - * $Log: bios.s,v $ - * Revision 2.2 92/04/04 11:34:26 rpd - * Fix Intel Copyright as per B. Davies authorization. - * [92/04/03 rvb] - * From 2.5 version - * [92/03/30 mg32] - * - * Revision 2.2 91/04/02 14:35:21 mbj - * Add Intel copyright - * [90/02/09 rvb] - * - */ - - -/* - Copyright 1988, 1989, 1990, 1991, 1992 - by Intel Corporation, Santa Clara, California. - - All Rights Reserved - -Permission to use, copy, modify, and distribute this software and -its documentation for any purpose and without fee is hereby -granted, provided that the above copyright notice appears in all -copies and that both the copyright notice and this permission notice -appear in supporting documentation, and that the name of Intel -not be used in advertising or publicity pertaining to distribution -of the software without specific, written prior permission. - -INTEL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE -INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, -IN NO EVENT SHALL INTEL BE LIABLE FOR ANY SPECIAL, INDIRECT, OR -CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM -LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT, -NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION -WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. -*/ - - .file "bios.s" - -#include "asm.h" - .text - -/* -# biosread(dev, cyl, head, sec) -# Read one sector from disk into the internal buffer "intbuf" which -# is the first 512 bytes of the boot loader. -# BIOS call "INT 0x13 Function 0x2" to read sectors from disk into memory -# Call with %ah = 0x2 -# %al = number of sectors -# %ch = cylinder -# %cl = sector -# %dh = head -# %dl = drive (0x80 for hard disk, 0x0 for floppy disk) -# %es:%bx = segment:offset of buffer -# Return: -# %al = 0x0 on success; err code on failure -*/ - -ENTRY(biosread) - push %ebp - mov %esp, %ebp - - push %ebx - push %ecx - push %edx - push %es - - movb 0x10(%ebp), %dh - movw 0x0c(%ebp), %cx - xchgb %ch, %cl # cylinder; the highest 2 bits of cyl is in %cl - rorb $2, %cl - movb 0x14(%ebp), %al - orb %al, %cl - incb %cl # sector; sec starts from 1, not 0 - movb 0x8(%ebp), %dl # device - xor %ebx, %ebx # offset -- 0 - # prot_to_real will set %es to BOOTSEG - - call EXT(prot_to_real) # enter real mode - movb $0x2, %ah # subfunction - movb $0x1, %al # number of sectors -- one - - sti - int $0x13 - cli - - mov %eax, %ebx # save return value - - data16 - call EXT(real_to_prot) # back to protected mode - - xor %eax, %eax - movb %bh, %al # return value in %ax - - pop %es - pop %edx - pop %ecx - pop %ebx - pop %ebp - - ret - - -/* -# putc(ch) -# BIOS call "INT 10H Function 0Eh" to write character to console -# Call with %ah = 0x0e -# %al = character -# %bh = page -# %bl = foreground color ( graphics modes) -*/ - - -ENTRY(putc) - push %ebp - mov %esp, %ebp - push %ebx - push %ecx - - movb 0x8(%ebp), %cl - - call EXT(prot_to_real) - - data16 - mov $0x1, %ebx # %bh=0, %bl=1 (blue) - movb $0xe, %ah - movb %cl, %al - sti - int $0x10 # display a byte - cli - - data16 - call EXT(real_to_prot) - - pop %ecx - pop %ebx - pop %ebp - ret - - -/* -# getc() -# BIOS call "INT 16H Function 00H" to read character from keyboard -# Call with %ah = 0x0 -# Return: %ah = keyboard scan code -# %al = ASCII character -*/ - -ENTRY(getc) - push %ebp - mov %esp, %ebp - push %ebx # save %ebx - - call EXT(prot_to_real) - - movb $0x0, %ah - sti - int $0x16 - cli - - movb %al, %bl # real_to_prot uses %eax - - data16 - call EXT(real_to_prot) - - xor %eax, %eax - movb %bl, %al - - pop %ebx - pop %ebp - ret -/* -# ischar() -# if there is a character pending, return it; otherwise return 0 -# BIOS call "INT 16H Function 01H" to check whether a character is pending -# Call with %ah = 0x1 -# Return: -# If key waiting to be input: -# %ah = keyboard scan code -# %al = ASCII character -# Zero flag = clear -# else -# Zero flag = set -*/ -ENTRY(ischar) - push %ebp - mov %esp, %ebp - push %ebx - - call EXT(prot_to_real) # enter real mode - - xor %ebx, %ebx - movb $0x1, %ah - sti - int $0x16 - cli - data16 - jz nochar - movb %al, %bl - -nochar: - data16 - call EXT(real_to_prot) - - xor %eax, %eax - movb %bl, %al - - pop %ebx - pop %ebp - ret - -/* -# -# get_diskinfo(): return a word that represents the -# max number of sectors and heads and drives for this device -# -*/ - -ENTRY(get_diskinfo) - push %ebp - mov %esp, %ebp - push %es - push %ebx - push %ecx - push %edx - - movb 0x8(%ebp), %dl # diskinfo(drive #) - call EXT(prot_to_real) # enter real mode - - movb $0x8, %ah # ask for disk info - - sti - int $0x13 - cli - - data16 - call EXT(real_to_prot) # back to protected mode - - xor %eax, %eax - - /*form a longword representing all this gunk*/ - movb %dh, %ah # # heads - andb $0x3f, %cl # mask of cylinder gunk - movb %cl, %al # # sectors - - pop %edx - pop %ecx - pop %ebx - pop %es - pop %ebp - ret - -/* -# -# memsize(i) : return the memory size in KB. i == 0 for conventional memory, -# i == 1 for extended memory -# BIOS call "INT 12H" to get conventional memory size -# BIOS call "INT 15H, AH=88H" to get extended memory size -# Both have the return value in AX. -# -*/ - -ENTRY(memsize) - push %ebp - mov %esp, %ebp - push %ebx - - mov 8(%ebp), %ebx - - call EXT(prot_to_real) # enter real mode - - cmpb $0x1, %bl - data16 - je xext - - sti - int $0x12 - cli - data16 - jmp xdone - -xext: movb $0x88, %ah - sti - int $0x15 - cli - -xdone: - mov %eax, %ebx - - data16 - call EXT(real_to_prot) - - mov %ebx, %eax - pop %ebx - pop %ebp - ret |
