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Diffstat (limited to 'src/fake86/netcard.c')
| -rwxr-xr-x | src/fake86/netcard.c | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/src/fake86/netcard.c b/src/fake86/netcard.c new file mode 100755 index 0000000..ab7d6d5 --- /dev/null +++ b/src/fake86/netcard.c @@ -0,0 +1,83 @@ +/* + Fake86: A portable, open-source 8086 PC emulator. + Copyright (C)2010-2013 Mike Chambers + + This program is free software; you can redistribute it and/or + modify it under the terms of the GNU General Public License + as published by the Free Software Foundation; either version 2 + of the License, or (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. +*/ + +/* netcard.c: this is a simple custom ethernet adapter interface for Fake86. + it's not modeled after a real-world ethernet adapter, thus i had to create + own DOS packet driver for programs to make use of it. this packet driver + is included with this source code, in the data/ directory. the filename is + pd.com - inject this file into any floppy or hard disk image if needed! */ + +#include "config.h" +#ifdef NETWORKING_ENABLED +#ifdef NETWORKING_OLDCARD +#include <stdio.h> +#include <string.h> +#include <stdint.h> +#include "cpu.h" + +extern uint8_t verbose; +extern union _bytewordregs_ regs; +extern uint8_t RAM[0x100000], readonly[0x100000], ethif; +extern uint16_t segregs[4]; +extern void sendpkt (uint8_t *src, uint16_t len); + +struct netstruct { + uint8_t enabled; + uint8_t canrecv; + uint16_t pktlen; +} net; + +void nethandler() { + uint32_t i; + if (ethif==254) return; //networking not enabled + switch (regs.byteregs[regah]) { //function number + case 0x00: //enable packet reception + net.enabled = 1; + net.canrecv = 1; + return; + case 0x01: //send packet of CX at DS:SI + if (verbose) { + printf ("Sending packet of %u bytes.\n", regs.wordregs[regcx]); + } + sendpkt (&RAM[ ( (uint32_t) segregs[regds] << 4) + (uint32_t) regs.wordregs[regsi]], regs.wordregs[regcx]); + return; + case 0x02: //return packet info (packet buffer in DS:SI, length in CX) + segregs[regds] = 0xD000; + regs.wordregs[regsi] = 0x0000; + regs.wordregs[regcx] = net.pktlen; + return; + case 0x03: //copy packet to final destination (given in ES:DI) + memcpy (&RAM[ ( (uint32_t) segregs[reges] << 4) + (uint32_t) regs.wordregs[regdi]], &RAM[0xD0000], net.pktlen); + return; + case 0x04: //disable packets + net.enabled = 0; + net.canrecv = 0; + return; + case 0x05: //DEBUG: dump packet (DS:SI) of CX bytes to stdout + for (i=0; i<regs.wordregs[regcx]; i++) { + printf ("%c", RAM[ ( (uint32_t) segregs[regds] << 4) + (uint32_t) regs.wordregs[regsi] + i]); + } + return; + case 0x06: //DEBUG: print milestone string + //print("PACKET DRIVER MILESTONE REACHED\n"); + return; + } +} +#endif +#endif |