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/* $OpenBSD: memprobe.c,v 1.1 2019/05/10 21:20:42 mlarkin Exp $ */
/*
* Copyright (c) 1997-1999 Michael Shalayeff
* Copyright (c) 1997-1999 Tobias Weingartner
* 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 ``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 REGENTS 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/param.h>
#include <machine/biosvar.h>
#include <dev/isa/isareg.h>
#include <stand/boot/bootarg.h>
#include "libsa.h"
u_int cnvmem, extmem; /* XXX - compatibility */
bios_memmap_t bios_memmap[64]; /* This is easier */
void
dump_biosmem(bios_memmap_t *tm)
{
register bios_memmap_t *p;
register u_int total = 0;
if (tm == NULL)
tm = bios_memmap;
for (p = tm; p->type != BIOS_MAP_END; p++) {
printf("Region %ld: type %u at 0x%llx for %uKB\n",
(long)(p - tm), p->type, p->addr,
(u_int)(p->size / 1024));
if (p->type == BIOS_MAP_FREE)
total += p->size / 1024;
}
printf("Low ram: %dKB High ram: %dKB\n", cnvmem, extmem);
printf("Total free memory: %uKB\n", total);
}
int
mem_limit(long long ml)
{
register bios_memmap_t *p;
for (p = bios_memmap; p->type != BIOS_MAP_END; p++) {
register int64_t sp = p->addr, ep = p->addr + p->size;
if (p->type != BIOS_MAP_FREE)
continue;
/* Wholly above limit, nuke it */
if ((sp >= ml) && (ep >= ml)) {
bcopy (p + 1, p, (char *)bios_memmap +
sizeof(bios_memmap) - (char *)p);
} else if ((sp < ml) && (ep >= ml)) {
p->size -= (ep - ml);
}
}
return 0;
}
int
mem_delete(long long sa, long long ea)
{
register bios_memmap_t *p;
for (p = bios_memmap; p->type != BIOS_MAP_END; p++) {
if (p->type == BIOS_MAP_FREE) {
register int64_t sp = p->addr, ep = p->addr + p->size;
/* can we eat it as a whole? */
if ((sa - sp) <= PAGE_SIZE && (ep - ea) <= PAGE_SIZE) {
bcopy(p + 1, p, (char *)bios_memmap +
sizeof(bios_memmap) - (char *)p);
break;
/* eat head or legs */
} else if (sa <= sp && sp < ea) {
p->addr = ea;
p->size = ep - ea;
break;
} else if (sa < ep && ep <= ea) {
p->size = sa - sp;
break;
} else if (sp < sa && ea < ep) {
/* bite in half */
bcopy(p, p + 1, (char *)bios_memmap +
sizeof(bios_memmap) - (char *)p -
sizeof(bios_memmap[0]));
p[1].addr = ea;
p[1].size = ep - ea;
p->size = sa - sp;
break;
}
}
}
return 0;
}
int
mem_add(long long sa, long long ea)
{
register bios_memmap_t *p;
for (p = bios_memmap; p->type != BIOS_MAP_END; p++) {
if (p->type == BIOS_MAP_FREE) {
register int64_t sp = p->addr, ep = p->addr + p->size;
/* is it already there? */
if (sp <= sa && ea <= ep) {
break;
/* join head or legs */
} else if (sa < sp && sp <= ea) {
p->addr = sa;
p->size = ep - sa;
break;
} else if (sa <= ep && ep < ea) {
p->size = ea - sp;
break;
} else if (ea < sp) {
/* insert before */
bcopy(p, p + 1, (char *)bios_memmap +
sizeof(bios_memmap) - (char *)(p - 1));
p->addr = sa;
p->size = ea - sa;
break;
}
}
}
/* meaning add new item at the end of the list */
if (p->type == BIOS_MAP_END) {
p[1] = p[0];
p->type = BIOS_MAP_FREE;
p->addr = sa;
p->size = ea - sa;
}
return 0;
}
void
mem_pass(void)
{
bios_memmap_t *p;
for (p = bios_memmap; p->type != BIOS_MAP_END; p++)
;
addbootarg(BOOTARG_MEMMAP, (p - bios_memmap + 1) * sizeof *bios_memmap,
bios_memmap);
}
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