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/* ----------------------------------------------------------------------- *
*
* Copyright 2004-2008 H. Peter Anvin - All Rights Reserved
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom
* the Software is furnished to do so, subject to the following
* conditions:
*
* The above copyright notice and this permission notice shall
* be included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* ----------------------------------------------------------------------- */
/*
* rawcon_read.c
*
* Character-oriented reading from the console without echo;
* this is a NONBLOCKING device.
*/
#include <errno.h>
#include <string.h>
#include <com32.h>
#include <minmax.h>
#include <sys/times.h>
#include "file.h"
/* Global, since it's used by stdcon_read */
ssize_t __rawcon_read(struct file_info *fp, void *buf, size_t count)
{
com32sys_t ireg, oreg;
char *bufp = buf;
size_t n = 0;
clock_t start;
(void)fp;
memset(&ireg, 0, sizeof ireg);
start = times(NULL);
while (n < count) {
/* Poll */
ireg.eax.b[1] = 0x0B;
__intcall(0x21, &ireg, &oreg);
if (!oreg.eax.b[0])
break;
/* We have data, go get it */
ireg.eax.b[1] = 0x08;
__intcall(0x21, &ireg, &oreg);
*bufp++ = oreg.eax.b[0];
n++;
}
return n;
}
const struct input_dev dev_rawcon_r = {
.dev_magic = __DEV_MAGIC,
.flags = __DEV_TTY | __DEV_INPUT,
.fileflags = O_RDONLY,
.read = __rawcon_read,
.close = NULL,
.open = NULL,
};
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