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|
//==========================================================================
//
// syscall.c
//
// Minimal generic syscall support.
//
//==========================================================================
// ####ECOSGPLCOPYRIGHTBEGIN####
// -------------------------------------------
// This file is part of eCos, the Embedded Configurable Operating System.
// Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
//
// 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.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 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 v2.
//
// This exception does not invalidate any other reasons why a work based
// on this file might be covered by the GNU General Public License.
// -------------------------------------------
// ####ECOSGPLCOPYRIGHTEND####
//==========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s):
// Contributors: gthomas
// Date: 1999-10-20
// Purpose: Minimal generic syscall support.
// Description:
//
//
//####DESCRIPTIONEND####
//
//=========================================================================
#include <errno.h>
#include <bsp/cpu.h>
#include <bsp/bsp.h>
#include "bsp_if.h"
#include "syscall.h"
/*
* read -- read bytes from the serial port. Ignore fd, since
* we only have stdin.
*/
static int
sys_read(int fd, char *buf, int nbytes)
{
int i = 0;
for (i = 0; i < nbytes; i++) {
*(buf + i) = bsp_console_getc();
if ((*(buf + i) == '\n') || (*(buf + i) == '\r')) {
(*(buf + i + 1)) = 0;
break;
}
}
return (i);
}
/*
* write -- write bytes to the serial port. Ignore fd, since
* stdout and stderr are the same. Since we have no filesystem,
* open will only return an error.
*/
static int
sys_write(int fd, char *buf, int nbytes)
{
#define WBUFSIZE 256
char ch, lbuf[WBUFSIZE];
int i, tosend;
tosend = nbytes;
while (tosend > 0) {
for (i = 0; tosend > 0 && i < (WBUFSIZE-2); tosend--) {
ch = *buf++;
if (ch == '\n')
lbuf[i++] = '\r';
lbuf[i++] = ch;
}
bsp_console_write(lbuf, i);
}
return (nbytes);
}
/*
* open -- open a file descriptor. We don't have a filesystem, so
* we return an error.
*/
static int
sys_open (const char *buf, int flags, int mode)
{
return (-EIO);
}
/*
* close -- We don't need to do anything, but pretend we did.
*/
static int
sys_close(int fd)
{
return (0);
}
/*
* lseek -- Since a serial port is non-seekable, we return an error.
*/
static int
sys_lseek(int fd, int offset, int whence)
{
#ifdef ESPIPE
return (-ESPIPE);
#else
return (-EIO);
#endif
}
/*
* Generic syscall handler.
*
* Returns 0 if syscall number is not handled by this
* module, 1 otherwise. This allows applications to
* extend the syscall handler by using exception chaining.
*/
int
_bsp_do_syscall(int func, /* syscall function number */
long arg1, long arg2, /* up to four args. */
long arg3, long arg4,
int *retval) /* syscall return value */
{
int err = 0;
switch (func) {
case SYS_read:
err = sys_read((int)arg1, (char *)arg2, (int)arg3);
break;
case SYS_write:
err = sys_write((int)arg1, (char *)arg2, (int)arg3);
break;
case SYS_open:
err = sys_open((const char *)arg1, (int)arg2, (int)arg3);
break;
case SYS_close:
err = sys_close((int)arg1);
break;
case SYS_lseek:
err = sys_lseek((int)arg1, (int)arg2, (int)arg3);
break;
case BSP_GET_SHARED:
*(bsp_shared_t **)arg1 = bsp_shared_data;
break;
case SYS_meminfo:
{
// Return the top and size of memory.
struct bsp_mem_info mem;
int i;
unsigned long u, totmem, topmem, numbanks;
i = totmem = topmem = numbanks = 0;
while (bsp_sysinfo(BSP_INFO_MEMORY, i++, &mem) == 0)
{
if (mem.kind == BSP_MEM_RAM)
{
numbanks++;
totmem += mem.nbytes;
u = (unsigned long)mem.virt_start + mem.nbytes;
if (u > topmem)
topmem = u;
}
}
*(unsigned long *)arg1 = totmem;
*(unsigned long *)arg2 = topmem;
*retval = numbanks;
}
return 1;
break;
default:
return 0;
}
*retval = err;
return 1;
}
|
