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Implement 21040 checksum algorithm

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This commit is contained in:
Cacodemon345
2024-01-21 13:28:29 +06:00
parent 7b38758072
commit 0da14beb39
1 changed files with 29 additions and 3 deletions
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32
src/network/net_tulip.c
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@@ -717,7 +717,7 @@ tulip_read(uint32_t addr, void *opaque)
data = s->csr[addr >> 3];
break;
}
pclog("[%04X:%08X]: CSR9 read %02x, data = %08x.\n", CS, cpu_state.pc, addr, data);
//pclog("[%04X:%08X]: CSR9 read %02x, data = %08x.\n", CS, cpu_state.pc, addr, data);
return data;
}
@@ -906,7 +906,7 @@ tulip_write(uint32_t addr, uint32_t data, void *opaque)
TULIPState *s = opaque;
addr &= 127;
pclog("[%04X:%08X]: Tulip Write >> 3: %02x, val=%08x.\n", CS, cpu_state.pc, addr >> 3, data);
//pclog("[%04X:%08X]: Tulip Write >> 3: %02x, val=%08x.\n", CS, cpu_state.pc, addr >> 3, data);
switch (addr) {
case CSR(0):
s->csr[0] = data;
@@ -1266,7 +1266,7 @@ tulip_pci_write(UNUSED(int func), int addr, uint8_t val, void *priv)
{
TULIPState *s = (TULIPState *) priv;
pclog("PCI write=%02x, ret=%02x.\n", addr, val);
//pclog("PCI write=%02x, ret=%02x.\n", addr, val);
switch (addr) {
case 0x04:
s->pci_conf[0x04] = val & 0x07;
@@ -1508,6 +1508,7 @@ nic_init(const device_t *info)
s->eeprom_data[126] = tulip_srom_crc(s->eeprom_data) & 0xff;
s->eeprom_data[127] = tulip_srom_crc(s->eeprom_data) >> 8;
} else {
uint32_t checksum = 0;
/* 21040 is supposed to only have MAC address in its serial ROM if Linux is correct. */
memset(s->eeprom_data, 0, sizeof(s->eeprom_data));
/* See if we have a local MAC address configured. */
@@ -1530,6 +1531,31 @@ nic_init(const device_t *info)
s->eeprom_data[4] = (mac >> 8) & 0xff;
s->eeprom_data[5] = (mac & 0xff);
}
/* Generate checksum. */
checksum = (s->eeprom_data[0] * 256) | s->eeprom_data[1];
checksum *= 2;
if (checksum > 65535)
checksum = checksum % 65535;
/* 2nd pair. */
checksum += (s->eeprom_data[2] * 256) | s->eeprom_data[3];
if (checksum > 65535)
checksum = checksum % 65535;
checksum *= 2;
if (checksum > 65535)
checksum = checksum % 65535;
/* 3rd pair. */
checksum += (s->eeprom_data[4] * 256) | s->eeprom_data[5];
if (checksum > 65535)
checksum = checksum % 65535;
if (checksum >= 65535)
checksum = 0;
s->eeprom_data[6] = (checksum >> 8) & 0xFF;
s->eeprom_data[7] = checksum & 0xFF;
}
if (info->local != 3) {