Index: arch/ia32/boot/boot.S =================================================================== --- arch/ia32/boot/boot.S (revision c9554dcb7a03509133fd6eacb2c5051a9337d886) +++ arch/ia32/boot/boot.S (revision c9554dcb7a03509133fd6eacb2c5051a9337d886) @@ -0,0 +1,151 @@ +# +# Copyright (C) 2001-2004 Jakub Jermar +# All rights reserved. +# +# Redistribution and use in source and binary forms, with or without +# modification, are permitted provided that the following conditions +# are met: +# +# - Redistributions of source code must retain the above copyright +# notice, this list of conditions and the following disclaimer. +# - Redistributions in binary form must reproduce the above copyright +# notice, this list of conditions and the following disclaimer in the +# documentation and/or other materials provided with the distribution. +# - The name of the author may not be used to endorse or promote products +# derived from this software without specific prior written permission. +# +# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR +# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES +# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. +# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, +# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT +# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF +# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. +# + +# This is a very primitive boot.s + +# It assumes that the first sector of the kernel image is found +# on head 0, track 0, sector 2 of the first floppy drive (1440K). +# Next kernel sectors follow on disk sector 3, 4, ... +# + + +# KERNEL_SIZE is passed from the outside to the preprocessor +#if (KERNEL_SIZE%512>0) +#define TAIL 1 +#else +#define TAIL 0 +#endif + +#define SECTORS (KERNEL_SIZE/512+TAIL) + +.text +.global _start_0x7c00 + +.code16 +_start_0x7c00: + xorw %ax,%ax # reset, %al will be used below + movw %ax,%dx # fd0, %dh and %dl will be used below + movw %dx,%ds + + movw %dx,%ss # initialize stack + movw $stack,%sp + + int $0x13 # reset floppy + jc stop_trying + + movw %dx,%ds + movw %dx,%ss + movw $0x7c00,%sp + movw $0xffe0,%si # after next increment, %si will become 0x0000 + movw %si,%es + movw $0x8000,%bx # at %es:%bx + + movl $(SECTORS),%edi + +read_next: + test %edi,%edi + jnz read_sectors + + movb $12,%al + movw $0x3f2,%dx + outb %al,%dx + + movb $('$'),%al + call echo_mark + + jmpl $0,$0x8000 + +read_sectors: + movb $('.'),%al + call echo_mark + + decl %edi + incw logical_sector + movw %es,%si + addw $0x20,%si + movw %si,%es + + movw logical_sector,%ax + divb sectors + + movb %ah,%cl + incb %cl # sector + + movb %al,%ch + shrb $1,%ch # track + + movb %al,%dh + andb $1,%dh # head + + movw $0x0201,%ax + int $0x13 + jnc read_next + + movb $('R'),%al + call echo_mark + + xorw %ax,%ax # try to reset + movw %ax,%dx # fd0 + int $0x13 + jnc read_next + +stop_trying: + movb $('F'),%al + call echo_mark + + cli + hlt + +CH=4 +echo_mark: + push %bp + movw %sp,%bp + pusha + + movb $0xe,%ah + movb $7,%bl + int $0x10 + + popa + pop %bp + ret + +# current logical sector from the beginning of the disk +logical_sector: + .word 0 + +# number of sectors per track on 1440 floppy +sectors: + .byte 18 + +# boot floppy signature +.org 0x1fe +boot_floppy_signature: + .byte 0x55 + .byte 0xaa +stack: Index: ch/ia32/boot/boot.s =================================================================== --- arch/ia32/boot/boot.s (revision 00eddded52a049f3ca638de7f8385bffc1177ce0) +++ (revision ) @@ -1,151 +1,0 @@ -# -# Copyright (C) 2001-2004 Jakub Jermar -# All rights reserved. -# -# Redistribution and use in source and binary forms, with or without -# modification, are permitted provided that the following conditions -# are met: -# -# - Redistributions of source code must retain the above copyright -# notice, this list of conditions and the following disclaimer. -# - Redistributions in binary form must reproduce the above copyright -# notice, this list of conditions and the following disclaimer in the -# documentation and/or other materials provided with the distribution. -# - The name of the author may not be used to endorse or promote products -# derived from this software without specific prior written permission. -# -# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR -# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES -# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. -# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, -# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT -# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, -# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY -# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT -# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF -# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. -# - -# This is a very primitive boot.s - -# It assumes that the first sector of the kernel image is found -# on head 0, track 0, sector 2 of the first floppy drive (1440K). -# Next kernel sectors follow on disk sector 3, 4, ... -# - - -# KERNEL_SIZE is passed from the outside to the preprocessor -#if (KERNEL_SIZE%512>0) -#define TAIL 1 -#else -#define TAIL 0 -#endif - -#define SECTORS (KERNEL_SIZE/512+TAIL) - -.text -.global _start_0x7c00 - -.code16 -_start_0x7c00: - xorw %ax,%ax # reset, %al will be used below - movw %ax,%dx # fd0, %dh and %dl will be used below - movw %dx,%ds - - movw %dx,%ss # initialize stack - movw $stack,%sp - - int $0x13 # reset floppy - jc stop_trying - - movw %dx,%ds - movw %dx,%ss - movw $0x7c00,%sp - movw $0xffe0,%si # after next increment, %si will become 0x0000 - movw %si,%es - movw $0x8000,%bx # at %es:%bx - - movl $(SECTORS),%edi - -read_next: - test %edi,%edi - jnz read_sectors - - movb $12,%al - movw $0x3f2,%dx - outb %al,%dx - - movb $('$'),%al - call echo_mark - - jmpl $0,$0x8000 - -read_sectors: - movb $('.'),%al - call echo_mark - - decl %edi - incw logical_sector - movw %es,%si - addw $0x20,%si - movw %si,%es - - movw logical_sector,%ax - divb sectors - - movb %ah,%cl - incb %cl # sector - - movb %al,%ch - shrb $1,%ch # track - - movb %al,%dh - andb $1,%dh # head - - movw $0x0201,%ax - int $0x13 - jnc read_next - - movb $('R'),%al - call echo_mark - - xorw %ax,%ax # try to reset - movw %ax,%dx # fd0 - int $0x13 - jnc read_next - -stop_trying: - movb $('F'),%al - call echo_mark - - cli - hlt - -CH=4 -echo_mark: - push %bp - movw %sp,%bp - pusha - - movb $0xe,%ah - movb $7,%bl - int $0x10 - - popa - pop %bp - ret - -# current logical sector from the beginning of the disk -logical_sector: - .word 0 - -# number of sectors per track on 1440 floppy -sectors: - .byte 18 - -# boot floppy signature -.org 0x1fe -boot_floppy_signature: - .byte 0x55 - .byte 0xaa -stack: