1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
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
|
