diff options
Diffstat (limited to 'contrib/syslinux-4.02/com32/sysdump/be_ymodem.c')
| -rw-r--r-- | contrib/syslinux-4.02/com32/sysdump/be_ymodem.c | 175 |
1 files changed, 175 insertions, 0 deletions
diff --git a/contrib/syslinux-4.02/com32/sysdump/be_ymodem.c b/contrib/syslinux-4.02/com32/sysdump/be_ymodem.c new file mode 100644 index 0000000..316b3d4 --- /dev/null +++ b/contrib/syslinux-4.02/com32/sysdump/be_ymodem.c @@ -0,0 +1,175 @@ +/* + * Ymodem send routine. Only supports 1K blocks and CRC mode. + */ + +#include <string.h> +#include <stdio.h> +#include <inttypes.h> +#include "backend.h" +#include "serial.h" + +enum { + SOH = 0x01, + STX = 0x02, + EOT = 0x04, + ACK = 0x06, + NAK = 0x15, + CAN = 0x18, +}; + +struct ymodem_state { + struct serial_if serial; + unsigned int seq, blocks; +}; + +/* + * Append a CRC16 to a block + */ +static void add_crc16(uint8_t * blk, int len) +{ + static const uint16_t crctab[256] = { + 0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7, + 0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef, + 0x1231, 0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6, + 0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de, + 0x2462, 0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485, + 0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d, + 0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6, 0x5695, 0x46b4, + 0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc, + 0x48c4, 0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823, + 0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b, + 0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0x0a50, 0x3a33, 0x2a12, + 0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a, + 0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41, + 0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49, + 0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70, + 0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78, + 0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f, + 0x1080, 0x00a1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067, + 0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e, + 0x02b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256, + 0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d, + 0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405, + 0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c, + 0x26d3, 0x36f2, 0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634, + 0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab, + 0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x08e1, 0x3882, 0x28a3, + 0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a, + 0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92, + 0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9, + 0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1, + 0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8, + 0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0 + }; + uint16_t crc = 0; + + while (len--) + crc = crctab[(crc >> 8) ^ *blk++] ^ crc << 8; + + *blk++ = crc >> 8; + *blk = crc; +} + +static void send_ack(struct ymodem_state *ym, const uint8_t *blk, + size_t bytes); + +static void send_ack_blk(struct ymodem_state *ym, uint8_t *blk) +{ + printf("Sending block %u/%u...\r", ym->seq, ym->blocks); + + blk[0] = STX; + blk[1] = ym->seq++; + blk[2] = ~blk[1]; + add_crc16(blk+3, 1024); + + send_ack(ym, blk, 1024+5); +} + +static void send_ack(struct ymodem_state *ym, const uint8_t *blk, size_t bytes) +{ + uint8_t ack_buf; + + do { + serial_write(&ym->serial, blk, bytes); + + do { + serial_read(&ym->serial, &ack_buf, 1); + } while (ack_buf != ACK && ack_buf != NAK); + } while (ack_buf == NAK); +} + +static int be_ymodem_write(struct backend *be) +{ + static const uint8_t eot_buf = EOT; + uint8_t ack_buf; + uint8_t blk_buf[1024 + 5]; + struct ymodem_state ym; + const char *buf; + size_t len, chunk; + const char ymodem_banner[] = "Now begin Ymodem download...\r\n"; + + buf = be->outbuf; + len = be->zbytes; + + putchar('\n'); + + ym.seq = 0; + ym.blocks = (len+1023)/1024; + + /* Initialize serial port */ + if (serial_init(&ym.serial, &be->argv[1])) + return -1; + + /* Write banner */ + printf("Writing banner...\n"); + serial_write(&ym.serial, ymodem_banner, sizeof ymodem_banner-1); + + /* Wait for initial handshake */ + printf("Waiting for handshake...\n"); + do { + serial_read(&ym.serial, &ack_buf, 1); + } while (ack_buf != 'C'); + + /* Send filename block */ + memset(blk_buf, 0, sizeof blk_buf); + snprintf((char *)blk_buf+3, 1024, "%s%c%zu 0%o 0644", + be->argv[0], 0, be->zbytes, be->now); + send_ack_blk(&ym, blk_buf); + + while (len) { + chunk = len < 1024 ? len : 1024; + + memcpy(blk_buf+3, buf, chunk); + if (chunk < 1024) + memset(blk_buf+3+chunk, 0x1a, 1024-chunk); + + send_ack_blk(&ym, blk_buf); + buf += chunk; + len -= chunk; + } + + printf("\nSending EOT...\n"); + send_ack(&ym, &eot_buf, 1); + + printf("Waiting for handshake...\n"); + do { + serial_read(&ym.serial, &ack_buf, 1); + } while (ack_buf != 'C'); + ym.seq = 0; + + printf("Sending batch termination block...\n"); + memset(blk_buf+3, 0, 1024); + send_ack_blk(&ym, blk_buf); + + printf("Cleaning up... \n"); + serial_cleanup(&ym.serial); + + return 0; +} + +struct backend be_ymodem = { + .name = "ymodem", + .helpmsg = "filename [port [speed]]", + .minargs = 1, + .write = be_ymodem_write, +}; |