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/* |
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* Copyright (C) 2005 Anders Gavare. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. The name of the author may not be used to endorse or promote products |
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* derived from this software without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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* |
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* |
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* $Id: dev_ether.c,v 1.9 2005/11/13 00:14:08 debug Exp $ |
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* |
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* Basic "ethernet" network device. This is a simple test device which can |
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* be used to send and receive packets to/from a simulated ethernet network. |
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*/ |
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|
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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|
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#include "cpu.h" |
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#include "device.h" |
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#include "devices.h" |
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#include "emul.h" |
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#include "machine.h" |
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#include "memory.h" |
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#include "misc.h" |
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#include "net.h" |
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|
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|
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#define DEV_ETHER_MAXBUFLEN 16384 |
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#define DEV_ETHER_TICK_SHIFT 14 |
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|
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#define STATUS_RECEIVED 0x01 |
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#define STATUS_MORE_AVAIL 0x02 |
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|
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struct ether_data { |
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unsigned char buf[DEV_ETHER_MAXBUFLEN]; |
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unsigned char mac[6]; |
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|
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int status; |
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int packet_len; |
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|
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int irq_nr; |
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}; |
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|
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|
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/* |
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* dev_ether_tick(): |
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*/ |
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void dev_ether_tick(struct cpu *cpu, void *extra) |
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{ |
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struct ether_data *d = (struct ether_data *) extra; |
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int r = 0; |
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|
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d->status &= ~STATUS_MORE_AVAIL; |
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if (cpu->machine->emul->net != NULL) |
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r = net_ethernet_rx_avail(cpu->machine->emul->net, d); |
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if (r) |
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d->status |= STATUS_MORE_AVAIL; |
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|
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if (d->status) |
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cpu_interrupt(cpu, d->irq_nr); |
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else |
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cpu_interrupt_ack(cpu, d->irq_nr); |
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} |
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|
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|
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/* |
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* dev_ether_buf_access(): |
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*/ |
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int dev_ether_buf_access(struct cpu *cpu, struct memory *mem, |
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uint64_t relative_addr, unsigned char *data, size_t len, |
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int writeflag, void *extra) |
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{ |
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struct ether_data *d = (struct ether_data *) extra; |
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|
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if (writeflag == MEM_WRITE) |
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memcpy(d->buf + relative_addr, data, len); |
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else |
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memcpy(data, d->buf + relative_addr, len); |
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return 1; |
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} |
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|
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|
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/* |
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* dev_ether_access(): |
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*/ |
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int dev_ether_access(struct cpu *cpu, struct memory *mem, |
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uint64_t relative_addr, unsigned char *data, size_t len, |
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int writeflag, void *extra) |
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{ |
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struct ether_data *d = (struct ether_data *) extra; |
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uint64_t idata = 0, odata = 0; |
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unsigned char *incoming_ptr; |
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int incoming_len; |
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|
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if (writeflag == MEM_WRITE) |
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idata = memory_readmax64(cpu, data, len); |
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|
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switch (relative_addr) { |
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case 0x0000: |
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if (writeflag == MEM_READ) { |
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odata = d->status; |
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d->status = 0; |
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cpu_interrupt_ack(cpu, d->irq_nr); |
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} else |
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fatal("[ ether: WARNING: write to status ]\n"); |
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break; |
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case 0x0010: |
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if (writeflag == MEM_READ) |
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odata = d->packet_len; |
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else { |
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if ((int64_t)idata < 0) { |
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fatal("[ ether: ERROR: packet len too" |
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" short (%i bytes) ]\n", (int)idata); |
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idata = -1; |
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} |
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if (idata > DEV_ETHER_MAXBUFLEN) { |
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fatal("[ ether: ERROR: packet len too" |
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" large (%i bytes) ]\n", (int)idata); |
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idata = DEV_ETHER_MAXBUFLEN; |
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} |
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d->packet_len = idata; |
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} |
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break; |
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case 0x0020: |
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if (writeflag == MEM_READ) |
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fatal("[ ether: WARNING: read from command ]\n"); |
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else { |
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switch (idata) { |
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case 0x00: /* Receive: */ |
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if (cpu->machine->emul->net == NULL) |
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fatal("[ ether: RECEIVE but no " |
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"net? ]\n"); |
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else { |
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d->status &= ~STATUS_RECEIVED; |
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net_ethernet_rx(cpu->machine->emul->net, |
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d, &incoming_ptr, &incoming_len); |
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if (incoming_ptr != NULL) { |
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d->status |= STATUS_RECEIVED; |
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if (incoming_len > |
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DEV_ETHER_MAXBUFLEN) |
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incoming_len = |
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DEV_ETHER_MAXBUFLEN; |
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memcpy(d->buf, incoming_ptr, |
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incoming_len); |
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free(incoming_ptr); |
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d->packet_len = incoming_len; |
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} |
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} |
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dev_ether_tick(cpu, d); |
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break; |
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case 0x01: /* Send */ |
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if (cpu->machine->emul->net == NULL) |
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fatal("[ ether: SEND but no net? ]\n"); |
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else |
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net_ethernet_tx(cpu->machine->emul->net, |
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d, d->buf, d->packet_len); |
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d->status &= ~STATUS_RECEIVED; |
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dev_ether_tick(cpu, d); |
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break; |
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default:fatal("[ ether: UNIMPLEMENTED command 0x" |
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"%02x ]\n", idata); |
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cpu->running = 0; |
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} |
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} |
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break; |
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default:if (writeflag == MEM_WRITE) { |
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fatal("[ ether: unimplemented write to " |
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"offset 0x%x: data=0x%x ]\n", (int) |
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relative_addr, (int)idata); |
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} else { |
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fatal("[ ether: unimplemented read from " |
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"offset 0x%x ]\n", (int)relative_addr); |
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} |
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} |
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|
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if (writeflag == MEM_READ) |
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memory_writemax64(cpu, data, len, odata); |
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|
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return 1; |
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} |
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|
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|
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/* |
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* devinit_ether(): |
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*/ |
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int devinit_ether(struct devinit *devinit) |
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{ |
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struct ether_data *d = malloc(sizeof(struct ether_data)); |
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size_t nlen; |
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char *n1, *n2; |
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char tmp[50]; |
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|
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nlen = strlen(devinit->name) + 80; |
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n1 = malloc(nlen); |
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n2 = malloc(nlen); |
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|
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if (d == NULL || n1 == NULL || n2 == NULL) { |
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fprintf(stderr, "out of memory\n"); |
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exit(1); |
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} |
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memset(d, 0, sizeof(struct ether_data)); |
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d->irq_nr = devinit->irq_nr; |
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|
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net_generate_unique_mac(devinit->machine, d->mac); |
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snprintf(tmp, sizeof(tmp), "%02x:%02x:%02x:%02x:%02x:%02x", |
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d->mac[0], d->mac[1], d->mac[2], d->mac[3], d->mac[4], d->mac[5]); |
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|
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snprintf(n1, nlen, "%s [%s]", devinit->name, tmp); |
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snprintf(n2, nlen, "%s [%s, control]", devinit->name, tmp); |
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|
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memory_device_register(devinit->machine->memory, n1, |
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devinit->addr, DEV_ETHER_MAXBUFLEN, dev_ether_buf_access, (void *)d, |
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DM_DYNTRANS_OK | DM_DYNTRANS_WRITE_OK | |
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DM_READS_HAVE_NO_SIDE_EFFECTS, d->buf); |
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memory_device_register(devinit->machine->memory, n2, |
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devinit->addr + DEV_ETHER_MAXBUFLEN, |
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DEV_ETHER_LENGTH-DEV_ETHER_MAXBUFLEN, dev_ether_access, (void *)d, |
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DM_DEFAULT, NULL); |
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|
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net_add_nic(devinit->machine->emul->net, d, d->mac); |
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|
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machine_add_tickfunction(devinit->machine, |
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dev_ether_tick, d, DEV_ETHER_TICK_SHIFT); |
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|
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return 1; |
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} |
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