1,0 → 0,0 |
link ../../../ia32/src/boot/memmap.S |
/* |
* Copyright (C) 2005 Josef Cejka |
* 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. |
*/ |
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#include <arch/boot/memmap.h> |
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E820_SMAP = 0x534d4150 |
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.global memmap_arch_init |
.global e801memorysize |
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.code16 |
.section K_TEXT_START_2, "ax" |
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memmap_arch_init: |
e820begin: |
xorl %ebx,%ebx # during first call, ebx must be 0 |
movw $e820table_boot,%di |
movb $MEMMAP_E820_MAX_RECORDS,e820counter_boot |
e820loop: |
movl $E820_SMAP,%edx # control sequence "SMAP" |
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movl $0x0000e820,%eax # service |
movl $MEMMAP_E820_RECORD_SIZE,%ecx |
int $0x15 |
jc e820err |
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cmpl $E820_SMAP,%eax # verifying BIOS |
jne e820err |
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cmpl $MEMMAP_E820_RECORD_SIZE,%ecx |
jne e820err # bad record size - bug in bios |
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movw %di,%ax # next record |
addw $MEMMAP_E820_RECORD_SIZE,%ax |
movw %ax,%di |
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decb e820counter_boot # buffer is full |
jz e820end |
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testl %ebx,%ebx |
jnz e820loop |
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e820end: |
movb $MEMMAP_E820_MAX_RECORDS,%al |
subb e820counter_boot,%al |
movb %al,e820counter_boot # store # of valid entries in e820counter |
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jmp e801begin |
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e820err: |
movb $0,e820counter_boot |
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# method e801 - get size of memory |
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e801begin: |
xorw %dx,%dx |
xorw %cx,%cx |
xorw %bx,%bx |
movw $0xe801,%ax |
stc |
int $0x15 |
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jc e801end |
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# fix problem with some BIOSes which use ax:bx rather than cx:dx |
testw %cx,%cx |
jnz e801cxdx |
testw %dx,%dx |
jnz e801cxdx |
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movw %ax,%cx |
movw %bx,%dx |
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e801cxdx: |
andl $0xffff,%edx |
shll $6,%edx |
andl $0xffff,%ecx |
addl %ecx,%edx |
addl $0x0400,%edx # add lower 1 MB - it's not included by e801 method |
movl %edx,e801memorysize |
e801end: |
ret |
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.section K_DATA_START, "aw", @progbits |
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#memory size in 1 kb chunks |
e801memorysize: |
.long 0 |
Property changes: |
Deleted: svn:special |
-* |
\ No newline at end of property |