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Checksum the configuration EEPROM.

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This commit is contained in:
Matthew N. Dodd 2003-03-29 21:57:32 +00:00
parent 839e119ec8
commit 18e03d5e08
1 changed files with 43 additions and 0 deletions
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43
sys/dev/ep/if_ep_isa.c
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@ -61,6 +61,7 @@ static void ep_isa_identify (driver_t *, device_t);
#endif
static int ep_isa_probe (device_t);
static int ep_isa_attach (device_t);
static int ep_eeprom_cksum (struct ep_softc *);
struct isa_ident {
u_int32_t id;
@ -343,6 +344,12 @@ ep_isa_attach (device_t dev)
goto bad;
}
error = ep_eeprom_cksum(sc);
if (error) {
device_printf(sc->dev, "Invalid EEPROM checksum!\n");
goto bad;
}
if ((error = bus_setup_intr(dev, sc->irq, INTR_TYPE_NET, ep_intr,
sc, &sc->ep_intrhand))) {
device_printf(dev, "bus_setup_intr() failed! (%d)\n", error);
@ -355,6 +362,42 @@ bad:
return (error);
}
static int
ep_eeprom_cksum (sc)
struct ep_softc * sc;
{
int i;
int error;
u_int16_t val;
u_int16_t cksum;
u_int8_t cksum_high = 0;
u_int8_t cksum_low = 0;
error = get_e(sc, 0x0f, &val);
if (error)
return (ENXIO);
cksum = val;
for (i = 0; i < 0x0f; i++) {
error = get_e(sc, i, &val);
if (error)
return (ENXIO);
switch (i) {
case 0x08:
case 0x09:
case 0x0d:
cksum_low ^= (u_int8_t)(val & 0x00ff) ^
(u_int8_t)((val & 0xff00) >> 8);
break;
default:
cksum_high ^= (u_int8_t)(val & 0x00ff) ^
(u_int8_t)((val & 0xff00) >> 8);
break;
}
}
return (cksum != ((u_int16_t)cksum_low | (u_int16_t)(cksum_high << 8)));
}
static device_method_t ep_isa_methods[] = {
/* Device interface */
#ifdef __i386__