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/* $OpenBSD: memprobe.c,v 1.24 1997/10/23 15:13:30 weingart Exp $ */
/*
* Copyright (c) 1997 Tobias Weingartner, Michael Shalayeff
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Tobias Weingartner.
* 4. 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 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 <stand/boot/bootarg.h>
#include "libsa.h"
static int addrprobe __P((u_int));
u_int cnvmem, extmem; /* XXX - compatibility */
bios_memmap_t *memory_map;
/* BIOS int 15, AX=E820
*
* This is the "prefered" method.
*/
static __inline bios_memmap_t *
bios_E820(mp)
register bios_memmap_t *mp;
{
int rc, off = 0, sig, gotcha = 0;
do {
BIOS_regs.biosr_es = ((u_int)(mp) >> 4);
__asm __volatile(DOINT(0x15) "; setc %b1"
: "=a" (sig), "=d" (rc), "=b" (off)
: "0" (0xE820), "1" (0x534d4150), "b" (off),
"c" (sizeof(*mp)), "D" (((u_int)mp) & 0xF)
: "cc", "memory");
off = BIOS_regs.biosr_bx;
if (rc & 0xff || sig != 0x534d4150)
break;
gotcha++;
mp->size >>= 10; /* / 1024 */
if (mp->type == 0)
mp->type = BIOS_MAP_RES;
mp++;
} while (off);
if (!gotcha)
return (NULL);
#ifdef DEBUG
printf("0x15[E820]");
#endif
return (mp);
}
/* BIOS int 15, AX=E801
*
* Only used if int 15, AX=E820 does not work.
* This should work for more than 64MB.
*/
static __inline bios_memmap_t *
bios_E801(mp)
register bios_memmap_t *mp;
{
int rc, m1, m2;
/* Test for 0xE801 */
__asm __volatile(DOINT(0x15) "; setc %b1"
: "=a" (m1), "=c" (rc), "=d" (m2) : "0" (0xE801));
/* Make a memory map from info */
if(rc & 0xff)
return (NULL);
#ifdef DEBUG
printf("0x15[E801]");
#endif
/* Fill out BIOS map */
mp->addr = (1024 * 1024); /* 1MB */
mp->size = (m1 & 0xffff);
mp->type = BIOS_MAP_FREE;
mp++;
mp->addr = (1024 * 1024) * 16; /* 16MB */
mp->size = (m2 & 0xffff) * 64;
mp->type = BIOS_MAP_FREE;
return ++mp;
}
/* BIOS int 15, AX=8800
*
* Only used if int 15, AX=E801 does not work.
* Machines with this are restricted to 64MB.
*/
static __inline bios_memmap_t *
bios_8800(mp)
register bios_memmap_t *mp;
{
int rc, mem;
__asm __volatile(DOINT(0x15) "; setc %b0"
: "=c" (rc), "=a" (mem) : "a" (0x8800));
if(rc & 0xff)
return (NULL);
#ifdef DEBUG
printf("0x15[8800]");
#endif
/* Fill out a BIOS_MAP */
mp->addr = 1024 * 1024; /* 1MB */
mp->size = mem & 0xffff;
mp->type = BIOS_MAP_FREE;
return ++mp;
}
/* BIOS int 0x12 Get Conventional Memory
*
* Only used if int 15, AX=E820 does not work.
*/
static __inline bios_memmap_t *
bios_int12(mp)
register bios_memmap_t *mp;
{
int mem;
#ifdef DEBUG
printf(", 0x12\n");
#endif
__asm __volatile(DOINT(0x12) : "=a" (mem) :: "%ecx", "%edx", "cc");
/* Fill out a bios_memmap_t */
mp->addr = 0;
mp->size = mem & 0xffff;
mp->type = BIOS_MAP_FREE;
return ++mp;
}
/* addrprobe(kloc): Probe memory at address kloc * 1024.
*
* This is a hack, but it seems to work ok. Maybe this is
* the *real* way that you are supposed to do probing???
*
* Modify the original a bit. We write everything first, and
* then test for the values. This should croak on machines that
* return values just written on non-existent memory...
*
* BTW: These machines are pretty broken IMHO.
*
* XXX - Does not detect aliased memory.
*/
static int
addrprobe(kloc)
u_int kloc;
{
__volatile u_int *loc;
static const u_int pat[] = {
0x00000000, 0xFFFFFFFF,
0x01010101, 0x10101010,
0x55555555, 0xCCCCCCCC
};
register u_int i, ret = 0;
u_int save[NENTS(pat)];
/* Get location */
loc = (int *)(kloc * 1024);
save[0] = *loc;
/* Probe address */
for(i = 0; i < NENTS(pat); i++){
*loc = pat[i];
if(*loc != pat[i])
ret++;
}
*loc = save[0];
if (!ret) {
/* Write address */
for(i = 0; i < NENTS(pat); i++) {
save[i] = loc[i];
loc[i] = pat[i];
}
/* Read address */
for(i = 0; i < NENTS(pat); i++) {
if(loc[i] != pat[i])
ret++;
loc[i] = save[i];
}
}
return ret;
}
/* Probe for all extended memory.
*
* This is only used as a last resort. If we resort to this
* routine, we are getting pretty desparate. Hopefully nobody
* has to rely on this after all the work above.
*
* XXX - Does not detect aliases memory.
* XXX - Could be destructive, as it does write.
*/
static __inline bios_memmap_t *
badprobe(mp)
register bios_memmap_t *mp;
{
int ram;
#ifdef DEBUG
printf("Scan");
#endif
/* probe extended memory
*
* There is no need to do this in assembly language. This is
* much easier to debug in C anyways.
*/
for(ram = 1024; ram < 512 * 1024; ram += 4)
if(addrprobe(ram))
break;
mp->addr = 1024 * 1024;
mp->size = ram - 1024;
mp->type = BIOS_MAP_FREE;
return ++mp;
}
void
memprobe()
{
static bios_memmap_t bm[32]; /* This is easier */
bios_memmap_t *pm = bm, *im;
#ifdef DEBUG
printf("Probing memory: ");
#endif
if(!(pm = bios_E820(bm))) {
im = bios_int12(bm);
pm = bios_E801(im);
if (!pm)
pm = bios_8800(im);
if (!pm)
pm = badprobe(im);
if (!pm) {
printf ("No Extended memory detected.");
pm = im;
}
}
#ifdef DEBUG
printf("\n");
#endif
pm->type = BIOS_MAP_END;
/* Register in global var */
addbootarg(BOOTARG_MEMMAP, (pm - bm + 1) * sizeof(*bm), bm);
memory_map = bm; /* XXX for 'machine mem' command only */
printf("mem0:");
/* XXX - Compatibility, remove later */
extmem = cnvmem = 0;
for(im = bm; im->type != BIOS_MAP_END; im++) {
if (im->type == BIOS_MAP_FREE) {
printf(" %luK", (u_long)im->size);
if(im->addr < 0x100000)
cnvmem += im->size;
else
extmem += im->size;
}
}
printf("\n");
}
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