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- #ident "$Id: rawcon_read.c,v 1.4 2004/12/20 22:55:48 hpa Exp $"
- /* ----------------------------------------------------------------------- *
- *
- * Copyright 2004 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, and with
- * a timeout (50-100 ms).
- */
-
- #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,
- };
-