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common/xyzModem.c
17.7 KB
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/* *========================================================================== * * xyzModem.c * * RedBoot stream handler for xyzModem protocol * *========================================================================== |
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* SPDX-License-Identifier: eCos-2.0 |
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*========================================================================== *#####DESCRIPTIONBEGIN#### * * Author(s): gthomas * Contributors: gthomas, tsmith, Yoshinori Sato * Date: 2000-07-14 * Purpose: * Description: * * This code is part of RedBoot (tm). * *####DESCRIPTIONEND#### * *========================================================================== */ |
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#include <common.h> #include <xyzModem.h> #include <stdarg.h> #include <crc.h> |
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/* Assumption - run xyzModem protocol over the console port */ |
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/* Values magic to the protocol */ |
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#define SOH 0x01 #define STX 0x02 #define EOT 0x04 #define ACK 0x06 #define BSP 0x08 #define NAK 0x15 #define CAN 0x18 |
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#define EOF 0x1A /* ^Z for DOS officionados */ |
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#define USE_YMODEM_LENGTH |
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/* Data & state local to the protocol */ |
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static struct { |
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#ifdef REDBOOT |
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hal_virtual_comm_table_t *__chan; |
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#else |
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int *__chan; |
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#endif |
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unsigned char pkt[1024], *bufp; unsigned char blk, cblk, crc1, crc2; unsigned char next_blk; /* Expected block */ int len, mode, total_retries; int total_SOH, total_STX, total_CAN; bool crc_mode, at_eof, tx_ack; |
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#ifdef USE_YMODEM_LENGTH |
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unsigned long file_length, read_length; |
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#endif } xyz; |
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#define xyzModem_CHAR_TIMEOUT 2000 /* 2 seconds */ |
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#define xyzModem_MAX_RETRIES 20 #define xyzModem_MAX_RETRIES_WITH_CRC 10 |
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#define xyzModem_CAN_COUNT 3 /* Wait for 3 CAN before quitting */ |
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#ifndef REDBOOT /*SB */ |
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typedef int cyg_int32; |
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static int |
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CYGACC_COMM_IF_GETC_TIMEOUT (char chan, char *c) { |
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#define DELAY 20 |
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unsigned long counter = 0; while (!tstc () && (counter < xyzModem_CHAR_TIMEOUT * 1000 / DELAY)) { udelay (DELAY); counter++; } if (tstc ()) { *c = getc (); return 1; } return 0; |
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} |
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static void |
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CYGACC_COMM_IF_PUTC (char x, char y) { putc (y); |
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} |
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/* Validate a hex character */ |
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__inline__ static bool |
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_is_hex (char c) |
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{ |
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return (((c >= '0') && (c <= '9')) || ((c >= 'A') && (c <= 'F')) || ((c >= 'a') && (c <= 'f'))); |
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} |
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/* Convert a single hex nibble */ |
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__inline__ static int |
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_from_hex (char c) |
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{ |
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int ret = 0; if ((c >= '0') && (c <= '9')) { ret = (c - '0'); } else if ((c >= 'a') && (c <= 'f')) { ret = (c - 'a' + 0x0a); |
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} |
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else if ((c >= 'A') && (c <= 'F')) { ret = (c - 'A' + 0x0A); } return ret; |
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} |
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/* Convert a character to lower case */ |
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__inline__ static char |
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_tolower (char c) |
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{ |
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if ((c >= 'A') && (c <= 'Z')) { c = (c - 'A') + 'a'; |
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} |
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return c; |
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} |
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/* Parse (scan) a number */ |
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static bool |
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parse_num (char *s, unsigned long *val, char **es, char *delim) |
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{ |
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bool first = true; int radix = 10; char c; unsigned long result = 0; int digit; while (*s == ' ') s++; while (*s) { if (first && (s[0] == '0') && (_tolower (s[1]) == 'x')) { radix = 16; s += 2; } first = false; c = *s++; if (_is_hex (c) && ((digit = _from_hex (c)) < radix)) { /* Valid digit */ |
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#ifdef CYGPKG_HAL_MIPS |
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/* FIXME: tx49 compiler generates 0x2539018 for MUL which */ /* isn't any good. */ if (16 == radix) result = result << 4; else result = 10 * result; result += digit; |
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#else |
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result = (result * radix) + digit; |
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#endif |
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} else { if (delim != (char *) 0) { /* See if this character is one of the delimiters */ char *dp = delim; while (*dp && (c != *dp)) dp++; if (*dp) break; /* Found a good delimiter */ } return false; /* Malformatted number */ } |
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} |
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*val = result; if (es != (char **) 0) { *es = s; |
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} |
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return true; |
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} #endif #define USE_SPRINTF #ifdef DEBUG #ifndef USE_SPRINTF |
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/* * Note: this debug setup only works if the target platform has two serial ports * available so that the other one (currently only port 1) can be used for debug * messages. */ |
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static int |
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zm_dprintf (char *fmt, ...) |
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{ |
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int cur_console; va_list args; |
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va_start (args, fmt); |
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#ifdef REDBOOT |
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cur_console = CYGACC_CALL_IF_SET_CONSOLE_COMM (CYGNUM_CALL_IF_SET_COMM_ID_QUERY_CURRENT); CYGACC_CALL_IF_SET_CONSOLE_COMM (1); |
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#endif |
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diag_vprintf (fmt, args); |
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#ifdef REDBOOT |
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CYGACC_CALL_IF_SET_CONSOLE_COMM (cur_console); |
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#endif } static void |
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zm_flush (void) |
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{ } #else |
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/* * Note: this debug setup works by storing the strings in a fixed buffer */ |
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#define FINAL #ifdef FINAL |
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static char *zm_out = (char *) 0x00380000; static char *zm_out_start = (char *) 0x00380000; |
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#else static char zm_buf[8192]; |
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static char *zm_out = zm_buf; |
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static char *zm_out_start = zm_buf; #endif static int |
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zm_dprintf (char *fmt, ...) |
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{ |
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int len; va_list args; |
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va_start (args, fmt); len = diag_vsprintf (zm_out, fmt, args); zm_out += len; return len; |
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} static void |
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zm_flush (void) |
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{ |
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#ifdef REDBOOT |
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char *p = zm_out_start; while (*p) mon_write_char (*p++); |
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#endif |
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zm_out = zm_out_start; |
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} #endif static void |
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zm_dump_buf (void *buf, int len) |
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{ #ifdef REDBOOT |
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diag_vdump_buf_with_offset (zm_dprintf, buf, len, 0); |
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#else #endif } static unsigned char zm_buf[2048]; static unsigned char *zm_bp; static void |
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zm_new (void) |
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{ |
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zm_bp = zm_buf; |
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} static void |
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zm_save (unsigned char c) |
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{ |
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*zm_bp++ = c; |
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} static void |
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zm_dump (int line) |
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{ |
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zm_dprintf ("Packet at line: %d ", line); zm_dump_buf (zm_buf, zm_bp - zm_buf); |
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} #define ZM_DEBUG(x) x #else #define ZM_DEBUG(x) #endif |
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/* Wait for the line to go idle */ |
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static void |
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xyzModem_flush (void) |
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{ |
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int res; char c; while (true) { res = CYGACC_COMM_IF_GETC_TIMEOUT (*xyz.__chan, &c); if (!res) return; |
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} } static int |
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xyzModem_get_hdr (void) |
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{ |
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char c; int res; bool hdr_found = false; int i, can_total, hdr_chars; unsigned short cksum; ZM_DEBUG (zm_new ()); /* Find the start of a header */ can_total = 0; hdr_chars = 0; if (xyz.tx_ack) { CYGACC_COMM_IF_PUTC (*xyz.__chan, ACK); xyz.tx_ack = false; |
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} |
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while (!hdr_found) { res = CYGACC_COMM_IF_GETC_TIMEOUT (*xyz.__chan, &c); ZM_DEBUG (zm_save (c)); if (res) { hdr_chars++; switch (c) { case SOH: xyz.total_SOH++; case STX: if (c == STX) xyz.total_STX++; hdr_found = true; break; case CAN: xyz.total_CAN++; ZM_DEBUG (zm_dump (__LINE__)); if (++can_total == xyzModem_CAN_COUNT) { return xyzModem_cancel; } else { /* Wait for multiple CAN to avoid early quits */ break; } case EOT: /* EOT only supported if no noise */ if (hdr_chars == 1) { CYGACC_COMM_IF_PUTC (*xyz.__chan, ACK); ZM_DEBUG (zm_dprintf ("ACK on EOT #%d ", __LINE__)); ZM_DEBUG (zm_dump (__LINE__)); return xyzModem_eof; } default: /* Ignore, waiting for start of header */ ; } } else { /* Data stream timed out */ xyzModem_flush (); /* Toss any current input */ ZM_DEBUG (zm_dump (__LINE__)); CYGACC_CALL_IF_DELAY_US ((cyg_int32) 250000); return xyzModem_timeout; } |
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} |
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/* Header found, now read the data */ res = CYGACC_COMM_IF_GETC_TIMEOUT (*xyz.__chan, (char *) &xyz.blk); ZM_DEBUG (zm_save (xyz.blk)); if (!res) { ZM_DEBUG (zm_dump (__LINE__)); return xyzModem_timeout; |
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} |
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res = CYGACC_COMM_IF_GETC_TIMEOUT (*xyz.__chan, (char *) &xyz.cblk); ZM_DEBUG (zm_save (xyz.cblk)); if (!res) { ZM_DEBUG (zm_dump (__LINE__)); return xyzModem_timeout; |
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} |
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xyz.len = (c == SOH) ? 128 : 1024; xyz.bufp = xyz.pkt; for (i = 0; i < xyz.len; i++) { res = CYGACC_COMM_IF_GETC_TIMEOUT (*xyz.__chan, &c); ZM_DEBUG (zm_save (c)); if (res) { xyz.pkt[i] = c; } else { ZM_DEBUG (zm_dump (__LINE__)); return xyzModem_timeout; } |
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} |
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res = CYGACC_COMM_IF_GETC_TIMEOUT (*xyz.__chan, (char *) &xyz.crc1); ZM_DEBUG (zm_save (xyz.crc1)); if (!res) { ZM_DEBUG (zm_dump (__LINE__)); return xyzModem_timeout; |
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} |
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if (xyz.crc_mode) { res = CYGACC_COMM_IF_GETC_TIMEOUT (*xyz.__chan, (char *) &xyz.crc2); ZM_DEBUG (zm_save (xyz.crc2)); if (!res) { ZM_DEBUG (zm_dump (__LINE__)); return xyzModem_timeout; } |
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} |
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ZM_DEBUG (zm_dump (__LINE__)); /* Validate the message */ if ((xyz.blk ^ xyz.cblk) != (unsigned char) 0xFF) { ZM_DEBUG (zm_dprintf ("Framing error - blk: %x/%x/%x ", xyz.blk, xyz.cblk, (xyz.blk ^ xyz.cblk))); ZM_DEBUG (zm_dump_buf (xyz.pkt, xyz.len)); xyzModem_flush (); return xyzModem_frame; |
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} |
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/* Verify checksum/CRC */ if (xyz.crc_mode) { cksum = cyg_crc16 (xyz.pkt, xyz.len); if (cksum != ((xyz.crc1 << 8) | xyz.crc2)) { ZM_DEBUG (zm_dprintf ("CRC error - recvd: %02x%02x, computed: %x ", xyz.crc1, xyz.crc2, cksum & 0xFFFF)); return xyzModem_cksum; } |
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} |
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else { cksum = 0; for (i = 0; i < xyz.len; i++) { cksum += xyz.pkt[i]; } if (xyz.crc1 != (cksum & 0xFF)) { ZM_DEBUG (zm_dprintf ("Checksum error - recvd: %x, computed: %x ", xyz.crc1, cksum & 0xFF)); return xyzModem_cksum; } } /* If we get here, the message passes [structural] muster */ return 0; |
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} |
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int |
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xyzModem_stream_open (connection_info_t * info, int *err) |
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{ |
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#ifdef REDBOOT |
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int console_chan; |
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#endif |
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int stat = 0; int retries = xyzModem_MAX_RETRIES; int crc_retries = xyzModem_MAX_RETRIES_WITH_CRC; |
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/* ZM_DEBUG(zm_out = zm_out_start); */ |
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#ifdef xyzModem_zmodem |
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if (info->mode == xyzModem_zmodem) { *err = xyzModem_noZmodem; return -1; |
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} #endif #ifdef REDBOOT |
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/* Set up the I/O channel. Note: this allows for using a different port in the future */ console_chan = CYGACC_CALL_IF_SET_CONSOLE_COMM (CYGNUM_CALL_IF_SET_COMM_ID_QUERY_CURRENT); if (info->chan >= 0) { CYGACC_CALL_IF_SET_CONSOLE_COMM (info->chan); |
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} |
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else { CYGACC_CALL_IF_SET_CONSOLE_COMM (console_chan); } xyz.__chan = CYGACC_CALL_IF_CONSOLE_PROCS (); |
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CYGACC_CALL_IF_SET_CONSOLE_COMM (console_chan); CYGACC_COMM_IF_CONTROL (*xyz.__chan, __COMMCTL_SET_TIMEOUT, xyzModem_CHAR_TIMEOUT); |
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#else |
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/* TODO: CHECK ! */ |
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int dummy = 0; |
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xyz.__chan = &dummy; |
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#endif |
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xyz.len = 0; xyz.crc_mode = true; xyz.at_eof = false; xyz.tx_ack = false; xyz.mode = info->mode; xyz.total_retries = 0; xyz.total_SOH = 0; xyz.total_STX = 0; xyz.total_CAN = 0; |
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#ifdef USE_YMODEM_LENGTH |
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xyz.read_length = 0; xyz.file_length = 0; |
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#endif |
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CYGACC_COMM_IF_PUTC (*xyz.__chan, (xyz.crc_mode ? 'C' : NAK)); |
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if (xyz.mode == xyzModem_xmodem) { /* X-modem doesn't have an information header - exit here */ xyz.next_blk = 1; return 0; |
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} |
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while (retries-- > 0) { stat = xyzModem_get_hdr (); if (stat == 0) { /* Y-modem file information header */ if (xyz.blk == 0) { |
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#ifdef USE_YMODEM_LENGTH |
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/* skip filename */ while (*xyz.bufp++); /* get the length */ parse_num ((char *) xyz.bufp, &xyz.file_length, NULL, " "); |
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#endif |
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/* The rest of the file name data block quietly discarded */ xyz.tx_ack = true; } xyz.next_blk = 1; xyz.len = 0; return 0; } else if (stat == xyzModem_timeout) { if (--crc_retries <= 0) xyz.crc_mode = false; CYGACC_CALL_IF_DELAY_US (5 * 100000); /* Extra delay for startup */ CYGACC_COMM_IF_PUTC (*xyz.__chan, (xyz.crc_mode ? 'C' : NAK)); xyz.total_retries++; ZM_DEBUG (zm_dprintf ("NAK (%d) ", __LINE__)); } if (stat == xyzModem_cancel) { break; } |
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} |
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*err = stat; ZM_DEBUG (zm_flush ()); return -1; |
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} |
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int |
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xyzModem_stream_read (char *buf, int size, int *err) |
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{ |
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int stat, total, len; int retries; total = 0; stat = xyzModem_cancel; /* Try and get 'size' bytes into the buffer */ while (!xyz.at_eof && (size > 0)) { if (xyz.len == 0) { retries = xyzModem_MAX_RETRIES; while (retries-- > 0) { stat = xyzModem_get_hdr (); if (stat == 0) { if (xyz.blk == xyz.next_blk) { xyz.tx_ack = true; ZM_DEBUG (zm_dprintf ("ACK block %d (%d) ", xyz.blk, __LINE__)); xyz.next_blk = (xyz.next_blk + 1) & 0xFF; |
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#if defined(xyzModem_zmodem) || defined(USE_YMODEM_LENGTH) |
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if (xyz.mode == xyzModem_xmodem || xyz.file_length == 0) { |
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#else |
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if (1) { |
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#endif |
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/* Data blocks can be padded with ^Z (EOF) characters */ /* This code tries to detect and remove them */ if ((xyz.bufp[xyz.len - 1] == EOF) && (xyz.bufp[xyz.len - 2] == EOF) && (xyz.bufp[xyz.len - 3] == EOF)) { while (xyz.len && (xyz.bufp[xyz.len - 1] == EOF)) { xyz.len--; } } } |
f2841d377
|
620 621 |
#ifdef USE_YMODEM_LENGTH |
7d0432c9e
|
622 623 624 625 626 627 628 629 630 631 632 633 634 635 |
/* * See if accumulated length exceeds that of the file. * If so, reduce size (i.e., cut out pad bytes) * Only do this for Y-modem (and Z-modem should it ever * be supported since it can fall back to Y-modem mode). */ if (xyz.mode != xyzModem_xmodem && 0 != xyz.file_length) { xyz.read_length += xyz.len; if (xyz.read_length > xyz.file_length) { xyz.len -= (xyz.read_length - xyz.file_length); } } |
f2841d377
|
636 |
#endif |
7d0432c9e
|
637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 |
break; } else if (xyz.blk == ((xyz.next_blk - 1) & 0xFF)) { /* Just re-ACK this so sender will get on with it */ CYGACC_COMM_IF_PUTC (*xyz.__chan, ACK); continue; /* Need new header */ } else { stat = xyzModem_sequence; } } if (stat == xyzModem_cancel) { break; } if (stat == xyzModem_eof) { CYGACC_COMM_IF_PUTC (*xyz.__chan, ACK); ZM_DEBUG (zm_dprintf ("ACK (%d) ", __LINE__)); if (xyz.mode == xyzModem_ymodem) { CYGACC_COMM_IF_PUTC (*xyz.__chan, (xyz.crc_mode ? 'C' : NAK)); xyz.total_retries++; ZM_DEBUG (zm_dprintf ("Reading Final Header ")); stat = xyzModem_get_hdr (); CYGACC_COMM_IF_PUTC (*xyz.__chan, ACK); ZM_DEBUG (zm_dprintf ("FINAL ACK (%d) ", __LINE__)); } xyz.at_eof = true; break; } CYGACC_COMM_IF_PUTC (*xyz.__chan, (xyz.crc_mode ? 'C' : NAK)); xyz.total_retries++; ZM_DEBUG (zm_dprintf ("NAK (%d) ", __LINE__)); } if (stat < 0) { *err = stat; xyz.len = -1; return total; } } /* Don't "read" data from the EOF protocol package */ if (!xyz.at_eof) { len = xyz.len; if (size < len) len = size; memcpy (buf, xyz.bufp, len); size -= len; buf += len; total += len; xyz.len -= len; xyz.bufp += len; } |
f2841d377
|
699 |
} |
7d0432c9e
|
700 |
return total; |
f2841d377
|
701 702 703 |
} void |
7d0432c9e
|
704 |
xyzModem_stream_close (int *err) |
f2841d377
|
705 |
{ |
7d0432c9e
|
706 707 708 709 710 711 |
diag_printf ("xyzModem - %s mode, %d(SOH)/%d(STX)/%d(CAN) packets, %d retries ", xyz.crc_mode ? "CRC" : "Cksum", xyz.total_SOH, xyz.total_STX, xyz.total_CAN, xyz.total_retries); ZM_DEBUG (zm_flush ()); |
f2841d377
|
712 |
} |
cf48eb9ab
|
713 714 |
/* Need to be able to clean out the input buffer, so have to take the */ /* getc */ |
7d0432c9e
|
715 716 |
void xyzModem_stream_terminate (bool abort, int (*getc) (void)) |
f2841d377
|
717 718 |
{ int c; |
7d0432c9e
|
719 720 721 722 723 724 |
if (abort) { ZM_DEBUG (zm_dprintf ("!!!! TRANSFER ABORT !!!! ")); switch (xyz.mode) { |
f2841d377
|
725 726 |
case xyzModem_xmodem: case xyzModem_ymodem: |
cf48eb9ab
|
727 728 |
/* The X/YMODEM Spec seems to suggest that multiple CAN followed by an equal */ /* number of Backspaces is a friendly way to get the other end to abort. */ |
7d0432c9e
|
729 730 731 732 733 734 735 736 |
CYGACC_COMM_IF_PUTC (*xyz.__chan, CAN); CYGACC_COMM_IF_PUTC (*xyz.__chan, CAN); CYGACC_COMM_IF_PUTC (*xyz.__chan, CAN); CYGACC_COMM_IF_PUTC (*xyz.__chan, CAN); CYGACC_COMM_IF_PUTC (*xyz.__chan, BSP); CYGACC_COMM_IF_PUTC (*xyz.__chan, BSP); CYGACC_COMM_IF_PUTC (*xyz.__chan, BSP); CYGACC_COMM_IF_PUTC (*xyz.__chan, BSP); |
cf48eb9ab
|
737 |
/* Now consume the rest of what's waiting on the line. */ |
7d0432c9e
|
738 739 740 741 742 |
ZM_DEBUG (zm_dprintf ("Flushing serial line. ")); xyzModem_flush (); xyz.at_eof = true; break; |
f2841d377
|
743 744 |
#ifdef xyzModem_zmodem case xyzModem_zmodem: |
cf48eb9ab
|
745 |
/* Might support it some day I suppose. */ |
f2841d377
|
746 |
#endif |
7d0432c9e
|
747 748 749 750 751 752 753 |
break; } } else { ZM_DEBUG (zm_dprintf ("Engaging cleanup mode... ")); |
cf48eb9ab
|
754 755 |
/* * Consume any trailing crap left in the inbuffer from |
162630879
|
756 |
* previous received blocks. Since very few files are an exact multiple |
cf48eb9ab
|
757 758 759 |
* of the transfer block size, there will almost always be some gunk here. * If we don't eat it now, RedBoot will think the user typed it. */ |
7d0432c9e
|
760 761 762 763 764 |
ZM_DEBUG (zm_dprintf ("Trailing gunk: ")); while ((c = (*getc) ()) > -1); ZM_DEBUG (zm_dprintf (" ")); |
cf48eb9ab
|
765 766 767 768 769 |
/* * Make a small delay to give terminal programs like minicom * time to get control again after their file transfer program * exits. */ |
7d0432c9e
|
770 771 |
CYGACC_CALL_IF_DELAY_US ((cyg_int32) 250000); } |
f2841d377
|
772 773 774 |
} char * |
7d0432c9e
|
775 |
xyzModem_error (int err) |
f2841d377
|
776 |
{ |
7d0432c9e
|
777 778 |
switch (err) { |
f2841d377
|
779 |
case xyzModem_access: |
7d0432c9e
|
780 781 |
return "Can't access file"; break; |
f2841d377
|
782 |
case xyzModem_noZmodem: |
7d0432c9e
|
783 784 |
return "Sorry, zModem not available yet"; break; |
f2841d377
|
785 |
case xyzModem_timeout: |
7d0432c9e
|
786 787 |
return "Timed out"; break; |
f2841d377
|
788 |
case xyzModem_eof: |
7d0432c9e
|
789 790 |
return "End of file"; break; |
f2841d377
|
791 |
case xyzModem_cancel: |
7d0432c9e
|
792 793 |
return "Cancelled"; break; |
f2841d377
|
794 |
case xyzModem_frame: |
7d0432c9e
|
795 796 |
return "Invalid framing"; break; |
f2841d377
|
797 |
case xyzModem_cksum: |
7d0432c9e
|
798 799 |
return "CRC/checksum error"; break; |
f2841d377
|
800 |
case xyzModem_sequence: |
7d0432c9e
|
801 802 |
return "Block sequence error"; break; |
f2841d377
|
803 |
default: |
7d0432c9e
|
804 805 |
return "Unknown error"; break; |
f2841d377
|
806 807 |
} } |
cf48eb9ab
|
808 809 810 |
/* * RedBoot interface */ |
7d0432c9e
|
811 812 813 814 815 816 |
#if 0 /* SB */ GETC_IO_FUNCS (xyzModem_io, xyzModem_stream_open, xyzModem_stream_close, xyzModem_stream_terminate, xyzModem_stream_read, xyzModem_error); RedBoot_load (xmodem, xyzModem_io, false, false, xyzModem_xmodem); RedBoot_load (ymodem, xyzModem_io, false, false, xyzModem_ymodem); |
cf48eb9ab
|
817 |
#endif |