net_io.c

redboot 源代码

//==========================================================================
//
//      net/net_io.c
//
//      Stand-alone network logical I/O support for RedBoot
//
//==========================================================================
//####ECOSGPLCOPYRIGHTBEGIN####
// -------------------------------------------
// This file is part of eCos, the Embedded Configurable Operating System.
// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
// Copyright (C) 2002 Gary Thomas
//
// eCos is free software; you can redistribute it and/or modify it under
// the terms of the GNU General Public License as published by the Free
// Software Foundation; either version 2 or (at your option) any later version.
//
// eCos is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
// for more details.
//
// You should have received a copy of the GNU General Public License along
// with eCos; if not, write to the Free Software Foundation, Inc.,
// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
//
// As a special exception, if other files instantiate templates or use macros
// or inline functions from this file, or you compile this file and link it
// with other works to produce a work based on this file, this file does not
// by itself cause the resulting work to be covered by the GNU General Public
// License. However the source code for this file must still be made available
// in accordance with section (3) of the GNU General Public License.
//
// This exception does not invalidate any other reasons why a work based on
// this file might be covered by the GNU General Public License.
//
// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
// at http://sources.redhat.com/ecos/ecos-license/
// -------------------------------------------
//####ECOSGPLCOPYRIGHTEND####
//==========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s):    gthomas
// Contributors: gthomas
// Date:         2000-07-14
// Purpose:      
// Description:  
//              
// This code is part of RedBoot (tm).
//
//####DESCRIPTIONEND####
//
//==========================================================================

#include <redboot.h>
#include <cyg/io/eth/eth_drv.h>            // Logical driver interfaces
#include <net/net.h>
#include <cyg/hal/hal_misc.h>   // Helper functions
#include <cyg/hal/hal_if.h>     // HAL I/O interfaces
#include <cyg/hal/drv_api.h>
#include <cyg/hal/hal_intr.h>

#ifdef CYGSEM_REDBOOT_FLASH_CONFIG
#include <flash_config.h>

RedBoot_config_option("GDB connection port",
                      gdb_port,
                      ALWAYS_ENABLED, true,
                      CONFIG_INT,
                      CYGNUM_REDBOOT_NETWORKING_TCP_PORT
    );
RedBoot_config_option("Network debug at boot time", 
                      net_debug, 
                      ALWAYS_ENABLED, true,
                      CONFIG_BOOL,
                      false
    );
// Note: the following options are related.  If 'bootp' is false, then
// the other values are used in the configuration.  Because of the way
// that configuration tables are generated, they should have names which
// are related.  The configuration options will show up lexicographically
// ordered, thus the peculiar naming.  In this case, the 'use' option is
// negated (if false, the others apply) which makes the names even more
// confusing.
RedBoot_config_option("Use BOOTP for network configuration",
                      bootp, 
                      ALWAYS_ENABLED, true,
                      CONFIG_BOOL,
                      true
    );
RedBoot_config_option("Local IP address",
                      bootp_my_ip,
                      "bootp", false,
                      CONFIG_IP,
                      0
    );
#ifdef CYGSEM_REDBOOT_NETWORKING_USE_GATEWAY
RedBoot_config_option("Local IP address mask",
                      bootp_my_ip_mask,
                      "bootp", false,
                      CONFIG_IP,
                      0
    );
RedBoot_config_option("Gateway IP address",
                      bootp_my_gateway_ip,
                      "bootp", false,
                      CONFIG_IP,
                      0
    );
#endif
RedBoot_config_option("Default server IP address",
                      bootp_server_ip,
                      "bootp", false,
                      CONFIG_IP,
                      0
    );

// Note: the following options are related too.
RedBoot_config_option("Force console for special debug messages",
                      info_console_force, 
                      ALWAYS_ENABLED, true,
                      CONFIG_BOOL,
                      false
    );
RedBoot_config_option("Console number for special debug messages",
                      info_console_number, 
                      "info_console_force", true,
                      CONFIG_INT,
                      0
    );
#endif

#define TCP_CHANNEL CYGNUM_HAL_VIRTUAL_VECTOR_COMM_CHANNELS

#ifdef DEBUG_TCP
int show_tcp = 0;
#endif 

static tcp_socket_t tcp_sock;
static int state;
static int _timeout = 500;
static int orig_console, orig_debug;

static int in_buflen = 0;
static unsigned char in_buf[64];
static unsigned char *in_bufp;
static int out_buflen = 0;
static unsigned char out_buf[1024];
static unsigned char *out_bufp;
static bool flush_output_lines = false;

// Functions in this module
static void net_io_flush(void);
static void net_io_revert_console(void);
static void net_io_putc(void*, cyg_uint8);

// Special characters used by Telnet - must be interpretted here
#define TELNET_IAC    0xFF // Interpret as command (escape)
#define TELNET_IP     0xF4 // Interrupt process
#define TELNET_WONT   0xFC // I Won't do it
#define TELNET_DO     0xFD // Will you XXX
#define TELNET_TM     0x06 // Time marker (special DO/WONT after IP)

static cyg_bool
_net_io_getc_nonblock(void* __ch_data, cyg_uint8* ch)
{
    if (in_buflen == 0) {
        __tcp_poll();
        if (tcp_sock.state == _CLOSE_WAIT) {
            // This connection is breaking
            if (tcp_sock.data_bytes == 0 && tcp_sock.rxcnt == 0) {
                __tcp_close(&tcp_sock);
                return false;
            }
        }
        if (tcp_sock.state == _CLOSED) {
            // The connection is gone
            net_io_revert_console();
            *ch = '\n';
            return true;
        }
        in_buflen = __tcp_read(&tcp_sock, in_buf, sizeof(in_buf));
        in_bufp = in_buf;
#ifdef DEBUG_TCP
        if (show_tcp && (in_buflen > 0)) {
            int old_console;
            old_console = start_console();  
            diag_printf("%s:%d\n", __FUNCTION__, __LINE__);  
            diag_dump_buf(in_buf, in_buflen);  
            end_console(old_console);
        }
#endif // DEBUG_TCP
    }
    if (in_buflen) {
        *ch = *in_bufp++;
        in_buflen--;
        return true;
    } else {
        return false;
    }
}

static cyg_bool
net_io_getc_nonblock(void* __ch_data, cyg_uint8* ch)
{
    cyg_uint8 esc;

    if (!_net_io_getc_nonblock(__ch_data, ch))
        return false;

    if (gdb_active || *ch != TELNET_IAC)
        return true;

    // Telnet escape - need to read/handle more
    while (!_net_io_getc_nonblock(__ch_data, &esc)) ;

    switch (esc) {
    case TELNET_IAC:
        // The other special case - escaped escape
        return true;
    case TELNET_IP:
        // Special case for ^C == Interrupt Process
        *ch = 0x03;  
        // Just in case the other end needs synchronizing
        net_io_putc(__ch_data, TELNET_IAC);
        net_io_putc(__ch_data, TELNET_WONT);
        net_io_putc(__ch_data, TELNET_TM);
        net_io_flush();
        return true;
    case TELNET_DO:
        // Telnet DO option
        while (!_net_io_getc_nonblock(__ch_data, &esc)) ;                
        // Respond with WONT option
        net_io_putc(__ch_data, TELNET_IAC);
        net_io_putc(__ch_data, TELNET_WONT);
        net_io_putc(__ch_data, esc);
        return false;  // Ignore this whole thing!
    default:
        return false;
    }
}

static cyg_uint8
net_io_getc(void* __ch_data)
{
    cyg_uint8 ch;
    int idle_timeout = 10;  // 10ms

    CYGARC_HAL_SAVE_GP();
    while (true) {
        if (net_io_getc_nonblock(__ch_data, &ch)) break;
        if (--idle_timeout == 0) {
            net_io_flush();
            idle_timeout = 10;
        }
    }
    CYGARC_HAL_RESTORE_GP();
    return ch;
}

static void
net_io_flush(void)
{
    int n;
    char *bp = out_buf;

#ifdef DEBUG_TCP
    if (show_tcp) {
        int old_console;
        old_console = start_console();  
        diag_printf("%s.%d\n", __FUNCTION__, __LINE__);
        diag_dump_buf(out_buf, out_buflen);  
        end_console(old_console);
    }
#endif // SHOW_TCP
    n = __tcp_write_block(&tcp_sock, bp, out_buflen);
    if (n < 0) {
        // The connection is gone!
        net_io_revert_console();
    } else {
        out_buflen -= n;
        bp += n;
    }
    out_bufp = out_buf;  out_buflen = 0;
    // Check interrupt flag
    if (CYGACC_CALL_IF_CONSOLE_INTERRUPT_FLAG()) {
        CYGACC_CALL_IF_CONSOLE_INTERRUPT_FLAG_SET(0);
        cyg_hal_user_break(0);
    }
}

static void
net_io_putc(void* __ch_data, cyg_uint8 c)
{
    static bool have_dollar, have_hash;
    static int hash_count;

    CYGARC_HAL_SAVE_GP();
    *out_bufp++ = c;
    if (c == '$') have_dollar = true;
    if (have_dollar && (c == '#')) {
        have_hash = true;
        hash_count = 0;
    }
    if ((++out_buflen == sizeof(out_buf)) ||
        (flush_output_lines && c == '\n') ||
        (have_hash && (++hash_count == 3))) {
        net_io_flush();
        have_dollar = false;
    }
    CYGARC_HAL_RESTORE_GP();
}

static void
net_io_write(void* __ch_data, const cyg_uint8* __buf, cyg_uint32 __len)
{
    int old_console;

    old_console = start_console();
    diag_printf("%s.%d\n", __FUNCTION__, __LINE__);
    end_console(old_console);
#if 0
    CYGARC_HAL_SAVE_GP();

    while(__len-- > 0)
        net_io_putc(__ch_data, *__buf++);

    CYGARC_HAL_RESTORE_GP();
#endif
}

static void
net_io_read(void* __ch_data, cyg_uint8* __buf, cyg_uint32 __len)
{
    int old_console;

    old_console = start_console();
    diag_printf("%s.%d\n", __FUNCTION__, __LINE__);
    end_console(old_console);
#if 0
    CYGARC_HAL_SAVE_GP();

    while(__len-- > 0)
        *__buf++ = net_io_getc(__ch_data);

    CYGARC_HAL_RESTORE_GP();
#endif
}

static cyg_bool
net_io_getc_timeout(void* __ch_data, cyg_uint8* ch)
{
    int delay_count;
    cyg_bool res;

    CYGARC_HAL_SAVE_GP();
    net_io_flush();  // Make sure any output has been sent
    delay_count = _timeout;

    for(;;) {
        res = net_io_getc_nonblock(__ch_data, ch);
        if (res || 0 == delay_count--)
            break;
    }

    CYGARC_HAL_RESTORE_GP();

    return res;
}

static int
net_io_control(void *__ch_data, __comm_control_cmd_t __func, ...)
{
    static int vector = 0;
    int ret = 0;
    static int irq_state = 0;

    CYGARC_HAL_SAVE_GP();

    switch (__func) {
    case __COMMCTL_IRQ_ENABLE:
        irq_state = 1;
        if (vector == 0) {
            vector = eth_drv_int_vector();
        }
        HAL_INTERRUPT_UNMASK(vector); 
        break;