819 lines
18 KiB
C
819 lines
18 KiB
C
/*
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*==========================================================================
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*
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* xyzModem.c
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*
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* RedBoot stream handler for xyzModem protocol
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*
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*==========================================================================
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* SPDX-License-Identifier: eCos-2.0
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*==========================================================================
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*#####DESCRIPTIONBEGIN####
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*
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* Author(s): gthomas
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* Contributors: gthomas, tsmith, Yoshinori Sato
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* Date: 2000-07-14
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* Purpose:
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* Description:
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*
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* This code is part of RedBoot (tm).
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*
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*####DESCRIPTIONEND####
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*
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*==========================================================================
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*/
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#include <common.h>
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#include <xyzModem.h>
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#include <stdarg.h>
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#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
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#define STX 0x02
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#define EOT 0x04
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#define ACK 0x06
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#define BSP 0x08
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#define NAK 0x15
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#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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{
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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;
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unsigned char blk, cblk, crc1, crc2;
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unsigned char next_blk; /* Expected block */
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int len, mode, total_retries;
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int total_SOH, total_STX, total_CAN;
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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
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} xyz;
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#define xyzModem_CHAR_TIMEOUT 2000 /* 2 seconds */
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#define xyzModem_MAX_RETRIES 20
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#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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{
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#define DELAY 20
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unsigned long counter = 0;
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while (!tstc () && (counter < xyzModem_CHAR_TIMEOUT * 1000 / DELAY))
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{
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udelay (DELAY);
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counter++;
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}
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if (tstc ())
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{
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*c = getc ();
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return 1;
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}
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return 0;
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}
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static void
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CYGACC_COMM_IF_PUTC (char x, char y)
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{
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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')) ||
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((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;
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if ((c >= '0') && (c <= '9'))
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{
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ret = (c - '0');
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}
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else if ((c >= 'a') && (c <= 'f'))
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{
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ret = (c - 'a' + 0x0a);
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}
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else if ((c >= 'A') && (c <= 'F'))
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{
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ret = (c - 'A' + 0x0A);
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}
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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'))
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{
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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;
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int radix = 10;
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char c;
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unsigned long result = 0;
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int digit;
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while (*s == ' ')
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s++;
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while (*s)
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{
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if (first && (s[0] == '0') && (_tolower (s[1]) == 'x'))
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{
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radix = 16;
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s += 2;
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}
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first = false;
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c = *s++;
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if (_is_hex (c) && ((digit = _from_hex (c)) < radix))
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{
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/* Valid digit */
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#ifdef CYGPKG_HAL_MIPS
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/* FIXME: tx49 compiler generates 0x2539018 for MUL which */
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/* isn't any good. */
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if (16 == radix)
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result = result << 4;
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else
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result = 10 * result;
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result += digit;
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#else
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result = (result * radix) + digit;
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#endif
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}
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else
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{
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if (delim != (char *) 0)
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{
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/* See if this character is one of the delimiters */
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char *dp = delim;
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while (*dp && (c != *dp))
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dp++;
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if (*dp)
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break; /* Found a good delimiter */
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}
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return false; /* Malformatted number */
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}
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}
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*val = result;
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if (es != (char **) 0)
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{
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*es = s;
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}
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return true;
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}
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#endif
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#define USE_SPRINTF
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#ifdef DEBUG
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#ifndef USE_SPRINTF
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/*
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* Note: this debug setup only works if the target platform has two serial ports
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* available so that the other one (currently only port 1) can be used for debug
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* messages.
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*/
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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;
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va_list args;
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va_start (args, fmt);
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#ifdef REDBOOT
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cur_console =
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CYGACC_CALL_IF_SET_CONSOLE_COMM
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(CYGNUM_CALL_IF_SET_COMM_ID_QUERY_CURRENT);
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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
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}
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static void
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zm_flush (void)
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{
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}
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#else
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/*
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* Note: this debug setup works by storing the strings in a fixed buffer
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*/
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#define FINAL
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#ifdef FINAL
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static char *zm_out = (char *) 0x00380000;
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static char *zm_out_start = (char *) 0x00380000;
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#else
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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;
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#endif
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static int
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zm_dprintf (char *fmt, ...)
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{
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int len;
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va_list args;
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va_start (args, fmt);
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len = diag_vsprintf (zm_out, fmt, args);
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zm_out += len;
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return len;
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}
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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;
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while (*p)
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mon_write_char (*p++);
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#endif
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zm_out = zm_out_start;
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}
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#endif
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static void
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zm_dump_buf (void *buf, int len)
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{
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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
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#endif
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}
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static unsigned char zm_buf[2048];
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static unsigned char *zm_bp;
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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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}
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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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}
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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\n", line);
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zm_dump_buf (zm_buf, zm_bp - zm_buf);
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}
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#define ZM_DEBUG(x) x
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#else
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#define ZM_DEBUG(x)
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#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;
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char c;
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while (true)
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{
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res = CYGACC_COMM_IF_GETC_TIMEOUT (*xyz.__chan, &c);
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if (!res)
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return;
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}
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}
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static int
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xyzModem_get_hdr (void)
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{
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char c;
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int res;
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bool hdr_found = false;
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int i, can_total, hdr_chars;
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unsigned short cksum;
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ZM_DEBUG (zm_new ());
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/* Find the start of a header */
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can_total = 0;
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hdr_chars = 0;
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if (xyz.tx_ack)
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{
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CYGACC_COMM_IF_PUTC (*xyz.__chan, ACK);
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xyz.tx_ack = false;
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}
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while (!hdr_found)
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{
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res = CYGACC_COMM_IF_GETC_TIMEOUT (*xyz.__chan, &c);
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ZM_DEBUG (zm_save (c));
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if (res)
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{
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hdr_chars++;
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switch (c)
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{
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case SOH:
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xyz.total_SOH++;
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case STX:
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if (c == STX)
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xyz.total_STX++;
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hdr_found = true;
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break;
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case CAN:
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xyz.total_CAN++;
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ZM_DEBUG (zm_dump (__LINE__));
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if (++can_total == xyzModem_CAN_COUNT)
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{
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return xyzModem_cancel;
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}
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else
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{
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/* Wait for multiple CAN to avoid early quits */
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break;
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}
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case EOT:
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/* EOT only supported if no noise */
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if (hdr_chars == 1)
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{
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CYGACC_COMM_IF_PUTC (*xyz.__chan, ACK);
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ZM_DEBUG (zm_dprintf ("ACK on EOT #%d\n", __LINE__));
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ZM_DEBUG (zm_dump (__LINE__));
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return xyzModem_eof;
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}
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default:
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/* Ignore, waiting for start of header */
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;
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}
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}
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else
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{
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/* Data stream timed out */
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xyzModem_flush (); /* Toss any current input */
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ZM_DEBUG (zm_dump (__LINE__));
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CYGACC_CALL_IF_DELAY_US ((cyg_int32) 250000);
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return xyzModem_timeout;
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}
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}
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/* Header found, now read the data */
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res = CYGACC_COMM_IF_GETC_TIMEOUT (*xyz.__chan, (char *) &xyz.blk);
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ZM_DEBUG (zm_save (xyz.blk));
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if (!res)
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{
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ZM_DEBUG (zm_dump (__LINE__));
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return xyzModem_timeout;
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}
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res = CYGACC_COMM_IF_GETC_TIMEOUT (*xyz.__chan, (char *) &xyz.cblk);
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ZM_DEBUG (zm_save (xyz.cblk));
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if (!res)
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{
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ZM_DEBUG (zm_dump (__LINE__));
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return xyzModem_timeout;
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}
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xyz.len = (c == SOH) ? 128 : 1024;
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xyz.bufp = xyz.pkt;
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for (i = 0; i < xyz.len; i++)
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{
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res = CYGACC_COMM_IF_GETC_TIMEOUT (*xyz.__chan, &c);
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ZM_DEBUG (zm_save (c));
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if (res)
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{
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xyz.pkt[i] = c;
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}
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else
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{
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ZM_DEBUG (zm_dump (__LINE__));
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return xyzModem_timeout;
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}
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}
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res = CYGACC_COMM_IF_GETC_TIMEOUT (*xyz.__chan, (char *) &xyz.crc1);
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ZM_DEBUG (zm_save (xyz.crc1));
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if (!res)
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{
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ZM_DEBUG (zm_dump (__LINE__));
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return xyzModem_timeout;
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}
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if (xyz.crc_mode)
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{
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res = CYGACC_COMM_IF_GETC_TIMEOUT (*xyz.__chan, (char *) &xyz.crc2);
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ZM_DEBUG (zm_save (xyz.crc2));
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if (!res)
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{
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ZM_DEBUG (zm_dump (__LINE__));
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return xyzModem_timeout;
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}
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}
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ZM_DEBUG (zm_dump (__LINE__));
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/* Validate the message */
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if ((xyz.blk ^ xyz.cblk) != (unsigned char) 0xFF)
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{
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ZM_DEBUG (zm_dprintf
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("Framing error - blk: %x/%x/%x\n", xyz.blk, xyz.cblk,
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(xyz.blk ^ xyz.cblk)));
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ZM_DEBUG (zm_dump_buf (xyz.pkt, xyz.len));
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xyzModem_flush ();
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return xyzModem_frame;
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}
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/* Verify checksum/CRC */
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if (xyz.crc_mode)
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{
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cksum = cyg_crc16 (xyz.pkt, xyz.len);
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if (cksum != ((xyz.crc1 << 8) | xyz.crc2))
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{
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ZM_DEBUG (zm_dprintf ("CRC error - recvd: %02x%02x, computed: %x\n",
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xyz.crc1, xyz.crc2, cksum & 0xFFFF));
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return xyzModem_cksum;
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}
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}
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else
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{
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cksum = 0;
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for (i = 0; i < xyz.len; i++)
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{
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cksum += xyz.pkt[i];
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}
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if (xyz.crc1 != (cksum & 0xFF))
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{
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ZM_DEBUG (zm_dprintf
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("Checksum error - recvd: %x, computed: %x\n", xyz.crc1,
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cksum & 0xFF));
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return xyzModem_cksum;
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}
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}
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/* If we get here, the message passes [structural] muster */
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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;
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int retries = xyzModem_MAX_RETRIES;
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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)
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{
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*err = xyzModem_noZmodem;
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return -1;
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}
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#endif
|
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|
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#ifdef REDBOOT
|
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/* Set up the I/O channel. Note: this allows for using a different port in the future */
|
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console_chan =
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CYGACC_CALL_IF_SET_CONSOLE_COMM
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(CYGNUM_CALL_IF_SET_COMM_ID_QUERY_CURRENT);
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if (info->chan >= 0)
|
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{
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CYGACC_CALL_IF_SET_CONSOLE_COMM (info->chan);
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}
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else
|
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{
|
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CYGACC_CALL_IF_SET_CONSOLE_COMM (console_chan);
|
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}
|
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xyz.__chan = CYGACC_CALL_IF_CONSOLE_PROCS ();
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|
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CYGACC_CALL_IF_SET_CONSOLE_COMM (console_chan);
|
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CYGACC_COMM_IF_CONTROL (*xyz.__chan, __COMMCTL_SET_TIMEOUT,
|
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xyzModem_CHAR_TIMEOUT);
|
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#else
|
|
/* 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;
|
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xyz.crc_mode = true;
|
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xyz.at_eof = false;
|
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xyz.tx_ack = false;
|
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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;
|
|
#endif
|
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|
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CYGACC_COMM_IF_PUTC (*xyz.__chan, (xyz.crc_mode ? 'C' : NAK));
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|
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if (xyz.mode == xyzModem_xmodem)
|
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{
|
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/* X-modem doesn't have an information header - exit here */
|
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xyz.next_blk = 1;
|
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return 0;
|
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}
|
|
|
|
while (retries-- > 0)
|
|
{
|
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stat = xyzModem_get_hdr ();
|
|
if (stat == 0)
|
|
{
|
|
/* Y-modem file information header */
|
|
if (xyz.blk == 0)
|
|
{
|
|
#ifdef USE_YMODEM_LENGTH
|
|
/* skip filename */
|
|
while (*xyz.bufp++);
|
|
/* get the length */
|
|
parse_num ((char *) xyz.bufp, &xyz.file_length, NULL, " ");
|
|
#endif
|
|
/* 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)\n", __LINE__));
|
|
}
|
|
if (stat == xyzModem_cancel)
|
|
{
|
|
break;
|
|
}
|
|
}
|
|
*err = stat;
|
|
ZM_DEBUG (zm_flush ());
|
|
return -1;
|
|
}
|
|
|
|
int
|
|
xyzModem_stream_read (char *buf, int size, int *err)
|
|
{
|
|
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)\n", xyz.blk, __LINE__));
|
|
xyz.next_blk = (xyz.next_blk + 1) & 0xFF;
|
|
|
|
#if defined(xyzModem_zmodem) || defined(USE_YMODEM_LENGTH)
|
|
if (xyz.mode == xyzModem_xmodem || xyz.file_length == 0)
|
|
{
|
|
#else
|
|
if (1)
|
|
{
|
|
#endif
|
|
/* 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--;
|
|
}
|
|
}
|
|
}
|
|
|
|
#ifdef USE_YMODEM_LENGTH
|
|
/*
|
|
* 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);
|
|
}
|
|
}
|
|
#endif
|
|
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)\n", __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\n"));
|
|
stat = xyzModem_get_hdr ();
|
|
CYGACC_COMM_IF_PUTC (*xyz.__chan, ACK);
|
|
ZM_DEBUG (zm_dprintf ("FINAL ACK (%d)\n", __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)\n", __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;
|
|
}
|
|
}
|
|
return total;
|
|
}
|
|
|
|
void
|
|
xyzModem_stream_close (int *err)
|
|
{
|
|
diag_printf
|
|
("xyzModem - %s mode, %d(SOH)/%d(STX)/%d(CAN) packets, %d retries\n",
|
|
xyz.crc_mode ? "CRC" : "Cksum", xyz.total_SOH, xyz.total_STX,
|
|
xyz.total_CAN, xyz.total_retries);
|
|
ZM_DEBUG (zm_flush ());
|
|
}
|
|
|
|
/* Need to be able to clean out the input buffer, so have to take the */
|
|
/* getc */
|
|
void
|
|
xyzModem_stream_terminate (bool abort, int (*getc) (void))
|
|
{
|
|
int c;
|
|
|
|
if (abort)
|
|
{
|
|
ZM_DEBUG (zm_dprintf ("!!!! TRANSFER ABORT !!!!\n"));
|
|
switch (xyz.mode)
|
|
{
|
|
case xyzModem_xmodem:
|
|
case xyzModem_ymodem:
|
|
/* 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. */
|
|
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);
|
|
/* Now consume the rest of what's waiting on the line. */
|
|
ZM_DEBUG (zm_dprintf ("Flushing serial line.\n"));
|
|
xyzModem_flush ();
|
|
xyz.at_eof = true;
|
|
break;
|
|
#ifdef xyzModem_zmodem
|
|
case xyzModem_zmodem:
|
|
/* Might support it some day I suppose. */
|
|
#endif
|
|
break;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
ZM_DEBUG (zm_dprintf ("Engaging cleanup mode...\n"));
|
|
/*
|
|
* Consume any trailing crap left in the inbuffer from
|
|
* previous received blocks. Since very few files are an exact multiple
|
|
* 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.
|
|
*/
|
|
ZM_DEBUG (zm_dprintf ("Trailing gunk:\n"));
|
|
while ((c = (*getc) ()) > -1)
|
|
;
|
|
ZM_DEBUG (zm_dprintf ("\n"));
|
|
/*
|
|
* Make a small delay to give terminal programs like minicom
|
|
* time to get control again after their file transfer program
|
|
* exits.
|
|
*/
|
|
CYGACC_CALL_IF_DELAY_US ((cyg_int32) 250000);
|
|
}
|
|
}
|
|
|
|
char *
|
|
xyzModem_error (int err)
|
|
{
|
|
switch (err)
|
|
{
|
|
case xyzModem_access:
|
|
return "Can't access file";
|
|
break;
|
|
case xyzModem_noZmodem:
|
|
return "Sorry, zModem not available yet";
|
|
break;
|
|
case xyzModem_timeout:
|
|
return "Timed out";
|
|
break;
|
|
case xyzModem_eof:
|
|
return "End of file";
|
|
break;
|
|
case xyzModem_cancel:
|
|
return "Cancelled";
|
|
break;
|
|
case xyzModem_frame:
|
|
return "Invalid framing";
|
|
break;
|
|
case xyzModem_cksum:
|
|
return "CRC/checksum error";
|
|
break;
|
|
case xyzModem_sequence:
|
|
return "Block sequence error";
|
|
break;
|
|
default:
|
|
return "Unknown error";
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* RedBoot interface
|
|
*/
|
|
#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);
|
|
#endif
|