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load.c
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// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2000-2004
* Wolfgang Denk, DENX Software Engineering, [email protected].
*/
/*
* Serial up- and download support
*/
#include <common.h>
#include <command.h>
#include <console.h>
#include <cpu_func.h>
#include <efi_loader.h>
#include <env.h>
#include <exports.h>
#ifdef CONFIG_MTD_NOR_FLASH
#include <flash.h>
#endif
#include <image.h>
#include <lmb.h>
#include <mapmem.h>
#include <net.h>
#include <s_record.h>
#include <serial.h>
#include <xyzModem.h>
#include <asm/cache.h>
#include <asm/global_data.h>
#include <linux/delay.h>
DECLARE_GLOBAL_DATA_PTR;
#if defined(CONFIG_CMD_LOADB)
static ulong load_serial_ymodem(ulong offset, int mode);
#endif
#if defined(CONFIG_CMD_LOADS)
static ulong load_serial(long offset);
static int read_record(char *buf, ulong len);
# if defined(CONFIG_CMD_SAVES)
static int save_serial(ulong offset, ulong size);
static int write_record(char *buf);
#endif
static int do_echo = 1;
#endif
/* -------------------------------------------------------------------- */
#if defined(CONFIG_CMD_LOADS)
static int do_load_serial(struct cmd_tbl *cmdtp, int flag, int argc,
char *const argv[])
{
long offset = 0;
ulong addr;
int i;
char *env_echo;
int rcode = 0;
#ifdef CONFIG_SYS_LOADS_BAUD_CHANGE
int load_baudrate, current_baudrate;
load_baudrate = current_baudrate = gd->baudrate;
#endif
env_echo = env_get("loads_echo");
if (env_echo && *env_echo == '1')
do_echo = 1;
else
do_echo = 0;
#ifdef CONFIG_SYS_LOADS_BAUD_CHANGE
if (argc >= 2) {
offset = simple_strtol(argv[1], NULL, 16);
}
if (argc == 3) {
load_baudrate = (int)dectoul(argv[2], NULL);
/* default to current baudrate */
if (load_baudrate == 0)
load_baudrate = current_baudrate;
}
if (load_baudrate != current_baudrate) {
printf("## Switch baudrate to %d bps and press ENTER ...\n",
load_baudrate);
udelay(50000);
flush();
gd->baudrate = load_baudrate;
serial_setbrg();
udelay(50000);
for (;;) {
if (getchar() == '\r')
break;
}
}
#else /* ! CONFIG_SYS_LOADS_BAUD_CHANGE */
if (argc == 2) {
offset = simple_strtol(argv[1], NULL, 16);
}
#endif /* CONFIG_SYS_LOADS_BAUD_CHANGE */
printf("## Ready for S-Record download ...\n");
addr = load_serial(offset);
/*
* Gather any trailing characters (for instance, the ^D which
* is sent by 'cu' after sending a file), and give the
* box some time (100 * 1 ms)
*/
for (i=0; i<100; ++i) {
if (tstc()) {
getchar();
}
udelay(1000);
}
if (addr == ~0) {
printf("## S-Record download aborted\n");
rcode = 1;
} else {
printf("## Start Addr = 0x%08lX\n", addr);
image_load_addr = addr;
}
#ifdef CONFIG_SYS_LOADS_BAUD_CHANGE
if (load_baudrate != current_baudrate) {
printf("## Switch baudrate to %d bps and press ESC ...\n",
current_baudrate);
udelay(50000);
flush();
gd->baudrate = current_baudrate;
serial_setbrg();
udelay(50000);
for (;;) {
if (getchar() == 0x1B) /* ESC */
break;
}
}
#endif
return rcode;
}
static ulong load_serial(long offset)
{
struct lmb lmb;
char record[SREC_MAXRECLEN + 1]; /* buffer for one S-Record */
char binbuf[SREC_MAXBINLEN]; /* buffer for binary data */
int binlen; /* no. of data bytes in S-Rec. */
int type; /* return code for record type */
ulong addr; /* load address from S-Record */
ulong size; /* number of bytes transferred */
ulong store_addr;
ulong start_addr = ~0;
ulong end_addr = 0;
int line_count = 0;
long ret;
lmb_init_and_reserve(&lmb, gd->bd, (void *)gd->fdt_blob);
while (read_record(record, SREC_MAXRECLEN + 1) >= 0) {
type = srec_decode(record, &binlen, &addr, binbuf);
if (type < 0) {
return (~0); /* Invalid S-Record */
}
switch (type) {
case SREC_DATA2:
case SREC_DATA3:
case SREC_DATA4:
store_addr = addr + offset;
#ifdef CONFIG_MTD_NOR_FLASH
if (addr2info(store_addr)) {
int rc;
rc = flash_write((char *)binbuf,store_addr,binlen);
if (rc != 0) {
flash_perror(rc);
return (~0);
}
} else
#endif
{
void *dst;
ret = lmb_reserve(&lmb, store_addr, binlen);
if (ret) {
printf("\nCannot overwrite reserved area (%08lx..%08lx)\n",
store_addr, store_addr + binlen);
return ret;
}
dst = map_sysmem(store_addr, binlen);
memcpy(dst, binbuf, binlen);
unmap_sysmem(dst);
lmb_free(&lmb, store_addr, binlen);
}
if ((store_addr) < start_addr)
start_addr = store_addr;
if ((store_addr + binlen - 1) > end_addr)
end_addr = store_addr + binlen - 1;
break;
case SREC_END2:
case SREC_END3:
case SREC_END4:
udelay(10000);
size = end_addr - start_addr + 1;
printf("\n"
"## First Load Addr = 0x%08lX\n"
"## Last Load Addr = 0x%08lX\n"
"## Total Size = 0x%08lX = %ld Bytes\n",
start_addr, end_addr, size, size
);
flush_cache(start_addr, size);
env_set_hex("filesize", size);
return (addr);
case SREC_START:
break;
default:
break;
}
if (!do_echo) { /* print a '.' every 100 lines */
if ((++line_count % 100) == 0)
putc('.');
}
}
return (~0); /* Download aborted */
}
static int read_record(char *buf, ulong len)
{
char *p;
char c;
--len; /* always leave room for terminating '\0' byte */
for (p=buf; p < buf+len; ++p) {
c = getchar(); /* read character */
if (do_echo)
putc(c); /* ... and echo it */
switch (c) {
case '\r':
case '\n':
*p = '\0';
return (p - buf);
case '\0':
case 0x03: /* ^C - Control C */
return (-1);
default:
*p = c;
}
/* Check for the console hangup (if any different from serial) */
if (gd->jt->getc != getchar) {
if (ctrlc())
return (-1);
}
}
/* line too long - truncate */
*p = '\0';
return (p - buf);
}
#if defined(CONFIG_CMD_SAVES)
int do_save_serial(struct cmd_tbl *cmdtp, int flag, int argc,
char *const argv[])
{
ulong offset = 0;
ulong size = 0;
#ifdef CONFIG_SYS_LOADS_BAUD_CHANGE
int save_baudrate, current_baudrate;
save_baudrate = current_baudrate = gd->baudrate;
#endif
if (argc >= 2) {
offset = hextoul(argv[1], NULL);
}
#ifdef CONFIG_SYS_LOADS_BAUD_CHANGE
if (argc >= 3) {
size = hextoul(argv[2], NULL);
}
if (argc == 4) {
save_baudrate = (int)dectoul(argv[3], NULL);
/* default to current baudrate */
if (save_baudrate == 0)
save_baudrate = current_baudrate;
}
if (save_baudrate != current_baudrate) {
printf("## Switch baudrate to %d bps and press ENTER ...\n",
save_baudrate);
udelay(50000);
gd->baudrate = save_baudrate;
serial_setbrg();
udelay(50000);
for (;;) {
if (getchar() == '\r')
break;
}
}
#else /* ! CONFIG_SYS_LOADS_BAUD_CHANGE */
if (argc == 3) {
size = hextoul(argv[2], NULL);
}
#endif /* CONFIG_SYS_LOADS_BAUD_CHANGE */
printf("## Ready for S-Record upload, press ENTER to proceed ...\n");
for (;;) {
if (getchar() == '\r')
break;
}
if (save_serial(offset, size)) {
printf("## S-Record upload aborted\n");
} else {
printf("## S-Record upload complete\n");
}
#ifdef CONFIG_SYS_LOADS_BAUD_CHANGE
if (save_baudrate != current_baudrate) {
printf("## Switch baudrate to %d bps and press ESC ...\n",
(int)current_baudrate);
udelay(50000);
flush();
gd->baudrate = current_baudrate;
serial_setbrg();
udelay(50000);
for (;;) {
if (getchar() == 0x1B) /* ESC */
break;
}
}
#endif
return 0;
}
#define SREC3_START "S0030000FC\n"
#define SREC3_FORMAT "S3%02X%08lX%s%02X\n"
#define SREC3_END "S70500000000FA\n"
#define SREC_BYTES_PER_RECORD 16
static int save_serial(ulong address, ulong count)
{
int i, c, reclen, checksum, length;
char *hex = "0123456789ABCDEF";
char record[2*SREC_BYTES_PER_RECORD+16]; /* buffer for one S-Record */
char data[2*SREC_BYTES_PER_RECORD+1]; /* buffer for hex data */
reclen = 0;
checksum = 0;
if(write_record(SREC3_START)) /* write the header */
return (-1);
do {
volatile uchar *src;
src = map_sysmem(address, count);
if (count) { /* collect hex data in the buffer */
c = src[reclen]; /* get one byte */
checksum += c; /* accumulate checksum */
data[2*reclen] = hex[(c>>4)&0x0f];
data[2*reclen+1] = hex[c & 0x0f];
data[2*reclen+2] = '\0';
++reclen;
--count;
}
unmap_sysmem((void *)src);
if(reclen == SREC_BYTES_PER_RECORD || count == 0) {
/* enough data collected for one record: dump it */
if(reclen) { /* build & write a data record: */
/* address + data + checksum */
length = 4 + reclen + 1;
/* accumulate length bytes into checksum */
for(i = 0; i < 2; i++)
checksum += (length >> (8*i)) & 0xff;
/* accumulate address bytes into checksum: */
for(i = 0; i < 4; i++)
checksum += (address >> (8*i)) & 0xff;
/* make proper checksum byte: */
checksum = ~checksum & 0xff;
/* output one record: */
sprintf(record, SREC3_FORMAT, length, address, data, checksum);
if(write_record(record))
return (-1);
}
address += reclen; /* increment address */
checksum = 0;
reclen = 0;
}
}
while(count);
if(write_record(SREC3_END)) /* write the final record */
return (-1);
return(0);
}
static int write_record(char *buf)
{
char c;
while((c = *buf++))
putc(c);
/* Check for the console hangup (if any different from serial) */
if (ctrlc()) {
return (-1);
}
return (0);
}
# endif
#endif
#if defined(CONFIG_CMD_LOADB)
/*
* loadb command (load binary) included
*/
#define XON_CHAR 17
#define XOFF_CHAR 19
#define START_CHAR 0x01
#define ETX_CHAR 0x03
#define END_CHAR 0x0D
#define SPACE 0x20
#define K_ESCAPE 0x23
#define SEND_TYPE 'S'
#define DATA_TYPE 'D'
#define ACK_TYPE 'Y'
#define NACK_TYPE 'N'
#define BREAK_TYPE 'B'
#define tochar(x) ((char) (((x) + SPACE) & 0xff))
#define untochar(x) ((int) (((x) - SPACE) & 0xff))
static void set_kerm_bin_mode(unsigned long *);
static int k_recv(void);
static ulong load_serial_bin(ulong offset);
static char his_eol; /* character he needs at end of packet */
static int his_pad_count; /* number of pad chars he needs */
static char his_pad_char; /* pad chars he needs */
static char his_quote; /* quote chars he'll use */
static int do_load_serial_bin(struct cmd_tbl *cmdtp, int flag, int argc,
char *const argv[])
{
ulong offset = 0;
ulong addr;
int load_baudrate, current_baudrate;
int rcode = 0;
char *s;
/* pre-set offset from CONFIG_SYS_LOAD_ADDR */
offset = CONFIG_SYS_LOAD_ADDR;
/* pre-set offset from $loadaddr */
s = env_get("loadaddr");
if (s)
offset = hextoul(s, NULL);
load_baudrate = current_baudrate = gd->baudrate;
if (argc >= 2) {
offset = hextoul(argv[1], NULL);
}
if (argc == 3) {
load_baudrate = (int)dectoul(argv[2], NULL);
/* default to current baudrate */
if (load_baudrate == 0)
load_baudrate = current_baudrate;
}
if (load_baudrate != current_baudrate) {
printf("## Switch baudrate to %d bps and press ENTER ...\n",
load_baudrate);
udelay(50000);
flush();
gd->baudrate = load_baudrate;
serial_setbrg();
udelay(50000);
for (;;) {
if (getchar() == '\r')
break;
}
}
if (strcmp(argv[0],"loady")==0) {
printf("## Ready for binary (ymodem) download "
"to 0x%08lX at %d bps...\n",
offset,
load_baudrate);
addr = load_serial_ymodem(offset, xyzModem_ymodem);
if (addr == ~0) {
image_load_addr = 0;
printf("## Binary (ymodem) download aborted\n");
rcode = 1;
} else {
printf("## Start Addr = 0x%08lX\n", addr);
image_load_addr = addr;
}
} else if (strcmp(argv[0],"loadx")==0) {
printf("## Ready for binary (xmodem) download "
"to 0x%08lX at %d bps...\n",
offset,
load_baudrate);
addr = load_serial_ymodem(offset, xyzModem_xmodem);
if (addr == ~0) {
image_load_addr = 0;
printf("## Binary (xmodem) download aborted\n");
rcode = 1;
} else {
printf("## Start Addr = 0x%08lX\n", addr);
image_load_addr = addr;
}
} else {
printf("## Ready for binary (kermit) download "
"to 0x%08lX at %d bps...\n",
offset,
load_baudrate);
addr = load_serial_bin(offset);
if (addr == ~0) {
image_load_addr = 0;
printf("## Binary (kermit) download aborted\n");
rcode = 1;
} else {
printf("## Start Addr = 0x%08lX\n", addr);
image_load_addr = addr;
}
}
if (load_baudrate != current_baudrate) {
printf("## Switch baudrate to %d bps and press ESC ...\n",
current_baudrate);
udelay(50000);
flush();
gd->baudrate = current_baudrate;
serial_setbrg();
udelay(50000);
for (;;) {
if (getchar() == 0x1B) /* ESC */
break;
}
}
return rcode;
}
static ulong load_serial_bin(ulong offset)
{
int size, i;
set_kerm_bin_mode((ulong *) offset);
size = k_recv();
/*
* Gather any trailing characters (for instance, the ^D which
* is sent by 'cu' after sending a file), and give the
* box some time (100 * 1 ms)
*/
for (i=0; i<100; ++i) {
if (tstc()) {
getchar();
}
udelay(1000);
}
if (size == 0)
return ~0; /* Download aborted */
flush_cache(offset, size);
printf("## Total Size = 0x%08x = %d Bytes\n", size, size);
env_set_hex("filesize", size);
return offset;
}
static void send_pad(void)
{
int count = his_pad_count;
while (count-- > 0)
putc(his_pad_char);
}
/* converts escaped kermit char to binary char */
static char ktrans(char in)
{
if ((in & 0x60) == 0x40) {
return (char) (in & ~0x40);
} else if ((in & 0x7f) == 0x3f) {
return (char) (in | 0x40);
} else
return in;
}
static int chk1(char *buffer)
{
int total = 0;
while (*buffer) {
total += *buffer++;
}
return (int) ((total + ((total >> 6) & 0x03)) & 0x3f);
}
static void s1_sendpacket(char *packet)
{
send_pad();
while (*packet) {
putc(*packet++);
}
}
static char a_b[24];
static void send_ack(int n)
{
a_b[0] = START_CHAR;
a_b[1] = tochar(3);
a_b[2] = tochar(n);
a_b[3] = ACK_TYPE;
a_b[4] = '\0';
a_b[4] = tochar(chk1(&a_b[1]));
a_b[5] = his_eol;
a_b[6] = '\0';
s1_sendpacket(a_b);
}
static void send_nack(int n)
{
a_b[0] = START_CHAR;
a_b[1] = tochar(3);
a_b[2] = tochar(n);
a_b[3] = NACK_TYPE;
a_b[4] = '\0';
a_b[4] = tochar(chk1(&a_b[1]));
a_b[5] = his_eol;
a_b[6] = '\0';
s1_sendpacket(a_b);
}
static void (*os_data_init)(void);
static void (*os_data_char)(char new_char);
static int os_data_state, os_data_state_saved;
static char *os_data_addr, *os_data_addr_saved;
static char *bin_start_address;
static void bin_data_init(void)
{
os_data_state = 0;
os_data_addr = bin_start_address;
}
static void os_data_save(void)
{
os_data_state_saved = os_data_state;
os_data_addr_saved = os_data_addr;
}
static void os_data_restore(void)
{
os_data_state = os_data_state_saved;
os_data_addr = os_data_addr_saved;
}
static void bin_data_char(char new_char)
{
switch (os_data_state) {
case 0: /* data */
*os_data_addr++ = new_char;
break;
}
}
static void set_kerm_bin_mode(unsigned long *addr)
{
bin_start_address = (char *) addr;
os_data_init = bin_data_init;
os_data_char = bin_data_char;
}
/* k_data_* simply handles the kermit escape translations */
static int k_data_escape, k_data_escape_saved;
static void k_data_init(void)
{
k_data_escape = 0;
os_data_init();
}
static void k_data_save(void)
{
k_data_escape_saved = k_data_escape;
os_data_save();
}
static void k_data_restore(void)
{
k_data_escape = k_data_escape_saved;
os_data_restore();
}
static void k_data_char(char new_char)
{
if (k_data_escape) {
/* last char was escape - translate this character */
os_data_char(ktrans(new_char));
k_data_escape = 0;
} else {
if (new_char == his_quote) {
/* this char is escape - remember */
k_data_escape = 1;
} else {
/* otherwise send this char as-is */
os_data_char(new_char);
}
}
}
#define SEND_DATA_SIZE 20
static char send_parms[SEND_DATA_SIZE];
static char *send_ptr;
/* handle_send_packet interprits the protocol info and builds and
sends an appropriate ack for what we can do */
static void handle_send_packet(int n)
{
int length = 3;
int bytes;
/* initialize some protocol parameters */
his_eol = END_CHAR; /* default end of line character */
his_pad_count = 0;
his_pad_char = '\0';
his_quote = K_ESCAPE;
/* ignore last character if it filled the buffer */
if (send_ptr == &send_parms[SEND_DATA_SIZE - 1])
--send_ptr;
bytes = send_ptr - send_parms; /* how many bytes we'll process */
do {
if (bytes-- <= 0)
break;
/* handle MAXL - max length */
/* ignore what he says - most I'll take (here) is 94 */
a_b[++length] = tochar(94);
if (bytes-- <= 0)
break;
/* handle TIME - time you should wait for my packets */
/* ignore what he says - don't wait for my ack longer than 1 second */
a_b[++length] = tochar(1);
if (bytes-- <= 0)
break;
/* handle NPAD - number of pad chars I need */
/* remember what he says - I need none */
his_pad_count = untochar(send_parms[2]);
a_b[++length] = tochar(0);
if (bytes-- <= 0)
break;
/* handle PADC - pad chars I need */
/* remember what he says - I need none */
his_pad_char = ktrans(send_parms[3]);
a_b[++length] = 0x40; /* He should ignore this */
if (bytes-- <= 0)
break;
/* handle EOL - end of line he needs */
/* remember what he says - I need CR */
his_eol = untochar(send_parms[4]);
a_b[++length] = tochar(END_CHAR);
if (bytes-- <= 0)
break;
/* handle QCTL - quote control char he'll use */
/* remember what he says - I'll use '#' */
his_quote = send_parms[5];
a_b[++length] = '#';
if (bytes-- <= 0)
break;
/* handle QBIN - 8-th bit prefixing */
/* ignore what he says - I refuse */
a_b[++length] = 'N';
if (bytes-- <= 0)
break;
/* handle CHKT - the clock check type */
/* ignore what he says - I do type 1 (for now) */
a_b[++length] = '1';
if (bytes-- <= 0)
break;
/* handle REPT - the repeat prefix */
/* ignore what he says - I refuse (for now) */
a_b[++length] = 'N';
if (bytes-- <= 0)
break;
/* handle CAPAS - the capabilities mask */
/* ignore what he says - I only do long packets - I don't do windows */
a_b[++length] = tochar(2); /* only long packets */
a_b[++length] = tochar(0); /* no windows */
a_b[++length] = tochar(94); /* large packet msb */
a_b[++length] = tochar(94); /* large packet lsb */
} while (0);
a_b[0] = START_CHAR;
a_b[1] = tochar(length);
a_b[2] = tochar(n);
a_b[3] = ACK_TYPE;
a_b[++length] = '\0';
a_b[length] = tochar(chk1(&a_b[1]));
a_b[++length] = his_eol;
a_b[++length] = '\0';
s1_sendpacket(a_b);
}
/* k_recv receives a OS Open image file over kermit line */
static int k_recv(void)
{
char new_char;
char k_state, k_state_saved;
int sum;
int done;
int length;
int n, last_n;
int len_lo, len_hi;
/* initialize some protocol parameters */
his_eol = END_CHAR; /* default end of line character */
his_pad_count = 0;
his_pad_char = '\0';
his_quote = K_ESCAPE;
/* initialize the k_recv and k_data state machine */
done = 0;
k_state = 0;
k_data_init();
k_state_saved = k_state;
k_data_save();
n = 0; /* just to get rid of a warning */
last_n = -1;
/* expect this "type" sequence (but don't check):
S: send initiate
F: file header
D: data (multiple)
Z: end of file
B: break transmission
*/
/* enter main loop */
while (!done) {
/* set the send packet pointer to begining of send packet parms */
send_ptr = send_parms;
/* With each packet, start summing the bytes starting with the length.
Save the current sequence number.
Note the type of the packet.
If a character less than SPACE (0x20) is received - error.
*/
#if 0
/* OLD CODE, Prior to checking sequence numbers */
/* first have all state machines save current states */
k_state_saved = k_state;
k_data_save ();
#endif
/* get a packet */
/* wait for the starting character or ^C */
for (;;) {
switch (getchar()) {
case START_CHAR: /* start packet */
goto START;
case ETX_CHAR: /* ^C waiting for packet */
return (0);
default:
;
}
}
START:
/* get length of packet */
sum = 0;
new_char = getchar();
if ((new_char & 0xE0) == 0)
goto packet_error;
sum += new_char & 0xff;
length = untochar(new_char);
/* get sequence number */
new_char = getchar();
if ((new_char & 0xE0) == 0)
goto packet_error;
sum += new_char & 0xff;
n = untochar(new_char);
--length;
/* NEW CODE - check sequence numbers for retried packets */
/* Note - this new code assumes that the sequence number is correctly
* received. Handling an invalid sequence number adds another layer
* of complexity that may not be needed - yet! At this time, I'm hoping
* that I don't need to buffer the incoming data packets and can write
* the data into memory in real time.
*/
if (n == last_n) {
/* same sequence number, restore the previous state */
k_state = k_state_saved;
k_data_restore();
} else {
/* new sequence number, checkpoint the download */
last_n = n;
k_state_saved = k_state;
k_data_save();
}
/* END NEW CODE */
/* get packet type */
new_char = getchar();
if ((new_char & 0xE0) == 0)
goto packet_error;
sum += new_char & 0xff;
k_state = new_char;
--length;
/* check for extended length */
if (length == -2) {
/* (length byte was 0, decremented twice) */
/* get the two length bytes */
new_char = getchar();
if ((new_char & 0xE0) == 0)
goto packet_error;
sum += new_char & 0xff;
len_hi = untochar(new_char);
new_char = getchar();
if ((new_char & 0xE0) == 0)
goto packet_error;
sum += new_char & 0xff;
len_lo = untochar(new_char);
length = len_hi * 95 + len_lo;
/* check header checksum */
new_char = getchar();
if ((new_char & 0xE0) == 0)
goto packet_error;
if (new_char != tochar((sum + ((sum >> 6) & 0x03)) & 0x3f))
goto packet_error;
sum += new_char & 0xff;
/* --length; */ /* new length includes only data and block check to come */
}
/* bring in rest of packet */
while (length > 1) {
new_char = getchar();
if ((new_char & 0xE0) == 0)
goto packet_error;
sum += new_char & 0xff;
--length;
if (k_state == DATA_TYPE) {
/* pass on the data if this is a data packet */
k_data_char (new_char);
} else if (k_state == SEND_TYPE) {
/* save send pack in buffer as is */
*send_ptr++ = new_char;
/* if too much data, back off the pointer */
if (send_ptr >= &send_parms[SEND_DATA_SIZE])
--send_ptr;
}
}
/* get and validate checksum character */
new_char = getchar();
if ((new_char & 0xE0) == 0)
goto packet_error;
if (new_char != tochar((sum + ((sum >> 6) & 0x03)) & 0x3f))
goto packet_error;
/* get END_CHAR */
new_char = getchar();
if (new_char != END_CHAR) {
packet_error:
/* restore state machines */
k_state = k_state_saved;
k_data_restore();
/* send a negative acknowledge packet in */
send_nack(n);
} else if (k_state == SEND_TYPE) {
/* crack the protocol parms, build an appropriate ack packet */
handle_send_packet(n);
} else {
/* send simple acknowledge packet in */
send_ack(n);
/* quit if end of transmission */
if (k_state == BREAK_TYPE)
done = 1;
}
}