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/*
* edd.c - real mode bios library for discovering EDD capabilities of
* BIOS drives
*
* Matt Wilson <msw@redhat.com>
*
* Copyright 2000 Red Hat, Inc.
*
* This software may be freely redistributed under the terms of the GNU
* library public license.
*
* You should have received a copy of the GNU Library Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#include <sys/io.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "lrmi.h"
#include "edd.h"
static int edd_lrmi_initialized = 0;
static int
edd_lrmi_init (void) {
if (edd_lrmi_initialized)
return EDD_SUCCESS;
if (iopl(3)) {
fprintf (stderr, "ERROR: failed to set iopl permissions\n");
return EDD_ERROR;
}
if (ioperm(0, 0x400, 1)) {
fprintf (stderr, "ERROR: failed to set ioperm permissions\n");
return EDD_ERROR;
}
/* Initialize LRMI. */
if(LRMI_init() == 1) {
edd_lrmi_initialized = 1;
return EDD_SUCCESS;
}
fprintf (stderr, "ERROR: failed to initialize lrmi library\n");
return EDD_ERROR;
}
EDDParameters *
edd_get_parameters (EDDCapability *ec)
{
struct LRMI_regs regs;
EDDParameters *ep, *ret;
return NULL;
if (edd_lrmi_init() == EDD_ERROR) {
return NULL;
}
(unsigned char *) ep = LRMI_alloc_real(sizeof(EDDParameters));
if (ep == NULL) {
return NULL;
}
memset(ep, 0, sizeof(EDDParameters));
memset(®s, 0, sizeof(regs));
if (ec->version.major == 3)
ep->buffer_size = 0x42;
else if (ec->version.major == 2)
ep->buffer_size = 0x1e;
else
ep->buffer_size = 0x1a;
regs.eax = 0x4800;
regs.edx = ec->drive & 0x00ff;
regs.es = ((u_int32_t) ep) >> 4;
regs.edi = ((u_int32_t) ep) & 0x0f;
printf ("%p -> 0x%x 0x%x\n", ep, regs.es, regs.edi);
if(LRMI_int(0x13, ®s) == 0) {
LRMI_free_real((unsigned char *) ep);
return NULL;
}
/* XXX check return */
printf ("0x%x\n", regs.eax);
printf ("0x%x\n", regs.flags);
ret = malloc (sizeof (EDDParameters));
if (ret == NULL) {
fprintf (stderr, "out of memory\n");
abort();
}
memcpy (ret, ep, sizeof (EDDParameters));
LRMI_free_real((unsigned char *) ep);
return ret;
}
EDDCapability *
edd_supported(int drive)
{
struct LRMI_regs regs;
FILE *f = fopen("/proc/cmdline", "r");
if (f) {
char buf[100];
fgets(buf, sizeof(buf) - 1, f);
fclose(f);
if (strstr(buf, "lba32")) {
EDDCapability *ec = malloc (sizeof (EDDCapability));
ec->edd = 1;
return ec;
}
}
if (edd_lrmi_init() == EDD_ERROR) {
return NULL;
}
memset(®s, 0, sizeof(regs));
regs.eax = 0x4100;
regs.ebx = 0x55aa;
regs.edx = drive & 0xff;
/* Do it. */
if (LRMI_int (0x13, ®s) == 0) {
return NULL;
}
/* Check for successful return. */
if(regs.ebx == 0xaa55) {
/* Supported, report capabilities */
EDDCapability *ec = malloc (sizeof (EDDCapability));
memset (ec, 0, sizeof (EDDCapability));
if (ec == NULL) {
fprintf (stderr, "out of memory\n");
abort();
}
if ((regs.eax & 0xff00) == 0x0100) {
ec->version.major = 1;
ec->version.minor = 0;
} else if ((regs.eax & 0xff00) == 0x2000) {
ec->version.major = 2;
ec->version.minor = 0;
} else if ((regs.eax & 0xff00) == 0x2100) {
ec->version.major = 2;
ec->version.minor = 1;
} else if ((regs.eax & 0xff00) == 0x3000) {
ec->version.major = 3;
ec->version.minor = 0;
} else {
fprintf (stderr, "WARNING: Unknown EDD version 0x%x supported\n",
regs.eax & 0xff00);
}
if (regs.ecx & EDD_CAPABILITY_EDA)
ec->eda = 1;
if (regs.ecx & EDD_CAPABILITY_REMOVABLE)
ec->removable = 1;
if (regs.ecx & EDD_CAPABILITY_EDD)
ec->edd = 1;
ec->drive = drive;
return ec;
} else {
/* Not supported. */
return NULL;
}
}
#ifdef TESTING
int
main (void)
{
int i;
EDDCapability *ec;
EDDParameters *ep;
for (i = 0x80; i < 0x90; i++) {
if ((ec = edd_supported(i))) {
printf ("edd version %d.%d supported on 0x%x\n", ec->version.major,
ec->version.minor, i);
printf (" extended disk access %s\n",
ec->eda ? "supported" : "not supported");
printf (" removable media functions %s\n",
ec->removable ? "supported" : "not supported");
printf (" edd functions %s\n",
ec->edd ? "supported" : "not supported");
ep = edd_get_parameters (ec);
if (ep) {
printf ("heads: %d cyl: %d sec/track: %d\n",
ep->heads, ep->cyls, ep->sectors);
free (ep);
} else
printf ("get_parameters call failed\n");
free (ec);
} else
printf ("edd not supported on 0x%x\n", i);
}
return 0;
}
#endif
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