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head/sys/boot/pc98/libpc98/biosmem.c
Property | Old Value | New Value |
---|---|---|
svn:keywords | null | FreeBSD=%H \ No newline at end of property |
/*- | |||||
* Copyright (c) 1998 Michael Smith <msmith@freebsd.org> | |||||
* All rights reserved. | |||||
* | |||||
* Redistribution and use in source and binary forms, with or without | |||||
* modification, are permitted provided that the following conditions | |||||
* are met: | |||||
* 1. Redistributions of source code must retain the above copyright | |||||
* notice, this list of conditions and the following disclaimer. | |||||
* 2. 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. | |||||
* | |||||
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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. | |||||
*/ | |||||
#include <sys/cdefs.h> | |||||
__FBSDID("$FreeBSD$"); | |||||
/* | |||||
* Obtain memory configuration information from the BIOS | |||||
*/ | |||||
#include <stand.h> | |||||
#include "libi386.h" | |||||
#include "btxv86.h" | |||||
vm_offset_t memtop, memtop_copyin, high_heap_base; | |||||
uint32_t bios_basemem, bios_extmem, high_heap_size; | |||||
/* | |||||
* The minimum amount of memory to reserve in bios_extmem for the heap. | |||||
*/ | |||||
#define HEAP_MIN (64 * 1024 * 1024) | |||||
void | |||||
bios_getmem(void) | |||||
{ | |||||
bios_basemem = ((*(u_char *)PTOV(0xA1501) & 0x07) + 1) * 128 * 1024; | |||||
bios_extmem = *(u_char *)PTOV(0xA1401) * 128 * 1024 + | |||||
*(u_int16_t *)PTOV(0xA1594) * 1024 * 1024; | |||||
/* Set memtop to actual top of memory */ | |||||
memtop = memtop_copyin = 0x100000 + bios_extmem; | |||||
/* | |||||
* If we have extended memory, use the last 3MB of 'extended' memory | |||||
* as a high heap candidate. | |||||
*/ | |||||
if (bios_extmem >= HEAP_MIN) { | |||||
high_heap_size = HEAP_MIN; | |||||
high_heap_base = memtop - HEAP_MIN; | |||||
} | |||||
} |