145 lines
6.5 KiB
C
145 lines
6.5 KiB
C
/* pdp11_ddcmp.h: Digital Data Communications Message Protocol support
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Copyright (c) 2013, Mark Pizzolato
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Permission is hereby granted, free of charge, to any person obtaining a
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copy of this software and associated documentation files (the "Software"),
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to deal in the Software without restriction, including without limitation
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the rights to use, copy, modify, merge, publish, distribute, sublicense,
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and/or sell copies of the Software, and to permit persons to whom the
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Software is furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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ROBERT M SUPNIK BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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Except as contained in this notice, the name of Robert M Supnik shall not be
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used in advertising or otherwise to promote the sale, use or other dealings
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in this Software without prior written authorization from Robert M Supnik.
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Digital Data Communications Message Protocol - DDCMP support routines
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29-May-13 MP Initial implementation
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*/
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#ifndef PDP11_DDCMP_H_
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#define PDP11_DDCMP_H_ 0
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/* DDCMP packet types */
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#define DDCMP_SYN 0226u /* Sync character on synchronous links */
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#define DDCMP_DEL 0377u /* Sync character on asynchronous links */
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#define DDCMP_SOH 0201u /* Numbered Data Message Identifier */
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#define DDCMP_ENQ 0005u /* Control Message Identifier */
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#define DDCMP_DLE 0220u /* Maintenance Message Identifier */
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/* Support routines */
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/* crc16 polynomial x^16 + x^15 + x^2 + 1 (0xA001) CCITT LSB */
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static uint16 crc16_nibble[16] = {
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0x0000, 0xCC01, 0xD801, 0x1400, 0xF001, 0x3C00, 0x2800, 0xE401,
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0xA001, 0x6C00, 0x7800, 0xB401, 0x5000, 0x9C01, 0x8801, 0x4400,
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};
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static uint16 ddcmp_crc16(uint16 crc, const void* vbuf, size_t len)
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{
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const unsigned char* buf = (const unsigned char*)vbuf;
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while(0 != len--) {
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crc = (crc>>4) ^ crc16_nibble[(*buf ^ crc) & 0xF];
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crc = (crc>>4) ^ crc16_nibble[((*buf++)>>4 ^ crc) & 0xF];
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};
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return(crc);
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}
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/* Debug routines */
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#include <ctype.h>
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static void ddcmp_packet_trace (uint32 reason, DEVICE *dptr, const char *txt, const uint8 *msg, int32 len, t_bool detail)
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{
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if (sim_deb && dptr && (reason & dptr->dctrl)) {
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sim_debug(reason, dptr, "%s len: %d\n", txt, len);
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if (detail) {
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int i, same, group, sidx, oidx;
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char outbuf[80], strbuf[18];
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static char hex[] = "0123456789ABCDEF";
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switch (msg[0]) {
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case DDCMP_SOH: /* Data Message */
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sim_debug (reason, dptr, "Data Message, Link: %d, Count: %d, Resp: %d, Num: %d, HDRCRC: %s, DATACRC: %s\n", msg[2]>>6, ((msg[2] & 0x3F) << 8)|msg[1], msg[3], msg[4],
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(0 == ddcmp_crc16 (0, msg, 8)) ? "OK" : "BAD", (0 == ddcmp_crc16 (0, msg+8, 2+(((msg[2] & 0x3F) << 8)|msg[1]))) ? "OK" : "BAD");
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break;
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case DDCMP_ENQ: /* Control Message */
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sim_debug (reason, dptr, "Control: Type: %d ", msg[1]);
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switch (msg[1]) {
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case 1: /* ACK */
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sim_debug (reason, dptr, "(ACK) ACKSUB: %d, Link: %d, Resp: %d\n", msg[2] & 0x3F, msg[2]>>6, msg[3]);
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break;
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case 2: /* NAK */
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sim_debug (reason, dptr, "(NAK) Reason: %d, Link: %d, Resp: %d\n", msg[2] & 0x3F, msg[2]>>6, msg[3]);
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break;
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case 3: /* REP */
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sim_debug (reason, dptr, "(REP) REPSUB: %d, Link: %d, Num: %d\n", msg[2] & 0x3F, msg[2]>>6, msg[4]);
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break;
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case 6: /* STRT */
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sim_debug (reason, dptr, "(STRT) STRTSUB: %d, Link: %d\n", msg[2] & 0x3F, msg[2]>>6);
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break;
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case 7: /* STACK */
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sim_debug (reason, dptr, "(STACK) STCKSUB: %d, Link: %d\n", msg[2] & 0x3F, msg[2]>>6);
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break;
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default: /* Unknown */
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sim_debug (reason, dptr, "(Unknown=0%o)\n", msg[1]);
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break;
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}
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if (len != 8) {
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sim_debug (reason, dptr, "Unexpected Control Message Length: %d expected 8\n", len);
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}
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if (0 != ddcmp_crc16 (0, msg, len)) {
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sim_debug (reason, dptr, "Unexpected Message CRC\n");
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}
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break;
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case DDCMP_DLE: /* Maintenance Message */
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sim_debug (reason, dptr, "Maintenance Message, Link: %d, Count: %d, HDRCRC: %s, DATACRC: %s\n", msg[2]>>6, ((msg[2] & 0x3F) << 8)| msg[1],
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(0 == ddcmp_crc16 (0, msg, 8)) ? "OK" : "BAD", (0 == ddcmp_crc16 (0, msg+8, 2+(((msg[2] & 0x3F) << 8)| msg[1]))) ? "OK" : "BAD");
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break;
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}
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for (i=same=0; i<len; i += 16) {
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if ((i > 0) && (0 == memcmp(&msg[i], &msg[i-16], 16))) {
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++same;
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continue;
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}
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if (same > 0) {
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sim_debug(reason, dptr, "%04X thru %04X same as above\n", i-(16*same), i-1);
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same = 0;
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}
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group = (((len - i) > 16) ? 16 : (len - i));
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for (sidx=oidx=0; sidx<group; ++sidx) {
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outbuf[oidx++] = ' ';
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outbuf[oidx++] = hex[(msg[i+sidx]>>4)&0xf];
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outbuf[oidx++] = hex[msg[i+sidx]&0xf];
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if (isprint(msg[i+sidx]))
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strbuf[sidx] = msg[i+sidx];
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else
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strbuf[sidx] = '.';
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}
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outbuf[oidx] = '\0';
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strbuf[sidx] = '\0';
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sim_debug(reason, dptr, "%04X%-48s %s\n", i, outbuf, strbuf);
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}
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if (same > 0) {
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sim_debug(reason, dptr, "%04X thru %04X same as above\n", i-(16*same), len-1);
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}
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}
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}
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}
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uint16 ddcmp_crc16(uint16 crc, const void* vbuf, size_t len);
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#endif /* PDP11_DDCMP_H_ */
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