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Separate checksum function from the fetch/copy functions.

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Compute the checksum on only IDPROM_CKSUM_SIZE bytes.
This commit is contained in:
gwr 1999-03-04 08:06:59 +00:00
parent 78eab1b1b9
commit 631e2be71e
1 changed files with 25 additions and 36 deletions
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61
sys/arch/sun3/stand/libsa/idprom.c
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@ -1,4 +1,4 @@
/* $NetBSD: idprom.c,v 1.2 1998/02/05 04:57:11 gwr Exp $ */
/* $NetBSD: idprom.c,v 1.3 1999/03/04 08:06:59 gwr Exp $ */
/*-
* Copyright (c) 1998 The NetBSD Foundation, Inc.
@ -41,7 +41,6 @@
*/
#include <sys/types.h>
#include <machine/control.h>
#include <machine/idprom.h>
#include <machine/mon.h>
@ -66,7 +65,7 @@ idprom_cksum(p)
{
int len, x;
len = sizeof(struct idprom);
len = IDPROM_CKSUM_SIZE;
x = 0; /* xor of data */
do x ^= *p++;
while (--len > 0);
@ -109,62 +108,52 @@ idprom_init()
void
idprom_init3()
{
u_char *dst;
vm_offset_t src; /* control space address */
int len, x, xorsum;
/* Copy the IDPROM contents and do the checksum. */
dst = (u_char *) &identity_prom;
src = 0; /* XXX */
len = sizeof(struct idprom);
do {
x = get_control_byte(src++);
*dst++ = x;
} while (--len > 0);
x = idprom_cksum((char *) &identity_prom);
if (x != 0)
mon_printf("idprom: bad checksum\n");
sun3_getidprom((u_char *) &identity_prom);
if (idprom_cksum((u_char *) &identity_prom))
printf("idprom: bad checksum\n");
}
/*
* Sun3X version:
* Rather than do all the map-in/probe work to find the idprom,
* we can cheat! We _know_ the monitor already made of copy of
* we can cheat! We _know_ the monitor already made a copy of
* the IDPROM in its data page. All we have to do is find it.
*
* Yeah, this is sorta gross... This is not needed any longer
* because netif_sun.c now can use the "advertised" function
* in 3.x PROMs to get the ethernet address. Let's keep this
* bit of trickery around for a while anyway, just in case...
* Yeah, this is sorta gross... Only used on old PROMs that
* do not have a sif_macaddr function (rev < 3.0). The area
* to search was determined from some "insider" info. about
* the layout of the PROM data area.
*/
void
idprom_init3x()
{
u_short *p;
int x;
u_char *p;
/* Search for it. Range determined empirically. */
for (p = (u_short *)(SUN3X_MONDATA + 0x0400);
p < (u_short *)(SUN3X_MONDATA + 0x1c00); p++)
printf("idprom: Sun3X search for soft copy...\n");
for (p = (u_char *)(SUN3X_MONDATA + 0x0400);
p < (u_char *)(SUN3X_MONDATA + 0x1c00); p++)
{
/* first some quick checks */
if ((p[0] & 0xfffc) != 0x140)
/* first check for some constants */
if (p[0] != 0x01) /* format */
continue;
if (p[1] != 0x0800)
if (p[2] != 0x08) /* ether[0] */
continue;
if (p[3] != 0x00) /* ether[1] */
continue;
if (p[4] != 0x20) /* ether[2] */
continue;
if ((p[1] & 0xfc) != IDM_ARCH_SUN3X)
continue;
/* Looks plausible. Try the checksum. */
x = idprom_cksum((u_char *) p);
if (x == 0)
if (idprom_cksum(p) == 0)
goto found;
}
panic("idprom: not found in monitor data\n");
found:
#ifdef DEBUG
printf("idprom: copy found at 0x%x\n", (int)p);
#endif
bcopy(p, &identity_prom, sizeof(struct idprom));
}