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/*
* BRLTTY - A background process providing access to the console screen (when in
* text mode) for a blind person using a refreshable braille display.
*
* Copyright (C) 1995-2014 by The BRLTTY Developers.
*
* BRLTTY comes with ABSOLUTELY NO WARRANTY.
*
* This is free software, placed under the terms of the
* GNU General Public License, as published by the Free Software
* Foundation; either version 2 of the License, or (at your option) any
* later version. Please see the file LICENSE-GPL for details.
*
* Web Page: http://mielke.cc/brltty/
*
* This software is maintained by Dave Mielke <dave@mielke.cc>.
*/
#ifndef BRLTTY_INCLUDED_SYSTEM_MSDOS
#define BRLTTY_INCLUDED_SYSTEM_MSDOS
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
extern void msdosBackground (void);
extern unsigned long msdosUSleep (unsigned long microseconds);
extern unsigned short msdosGetCodePage (void);
static inline unsigned long
msdosMakeAddress (unsigned short segment, unsigned short offset) {
return ((unsigned long)segment << 4) + (unsigned long)offset;
}
static inline void msdosBreakAddress (
unsigned long address, int absolute,
unsigned short *segment, unsigned short *offset
) {
if (absolute) {
if (segment) *segment = (address >> 4) & 0XF000;
if (offset) *offset = address & 0XFFFF;
} else {
if (segment) *segment = address >> 4;
if (offset) *offset = address & 0XF;
}
}
#define MSDOS_PIT_FREQUENCY UINT64_C(1193180)
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* BRLTTY_INCLUDED_SYSTEM_MSDOS */
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