valter/dosbox-staging
1
0
Fork 0
Code Releases Activity

iodelay aware cycle adjustment code.

Browse source 
Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@2802
This commit is contained in:
Peter Veenstra 2007-02-04 11:10:22 +00:00
parent f28020edb3
commit 0bf5025fea
4 changed files with 58 additions and 18 deletions
Download patch file Download diff file Expand all files Collapse all files

28
src/hardware/iohandler.cpp
View file

@ -16,7 +16,7 @@
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/* $Id: iohandler.cpp,v 1.24 2007-01-13 10:43:40 qbix79 Exp $ */
/* $Id: iohandler.cpp,v 1.25 2007-02-04 11:10:22 qbix79 Exp $ */
#include <string.h>
#include "dosbox.h"
@ -167,12 +167,11 @@ static Bits IOFaultCore(void) {
* games with their timing of certain operations
*/
extern Bit32s CPU_CycleMax;
#define IODELAY_READ_MICROS 1.0
#define IODELAY_WRITE_MICROS 0.75
inline void IO_USEC_read_delay() {
inline void IO_USEC_read_delay_old() {
if(CPU_CycleMax > static_cast<Bit32s>((IODELAY_READ_MICROS*1000.0))) {
// this could be calculated whenever CPU_CycleMax changes
Bitu delaycyc = static_cast<Bitu>((CPU_CycleMax/1000)*IODELAY_READ_MICROS);
@ -181,7 +180,7 @@ inline void IO_USEC_read_delay() {
}
}
inline void IO_USEC_write_delay() {
inline void IO_USEC_write_delay_old() {
if(CPU_CycleMax > static_cast<Bit32s>((IODELAY_WRITE_MICROS*1000.0))) {
// this could be calculated whenever CPU_CycleMax changes
Bitu delaycyc = static_cast<Bitu>((CPU_CycleMax/1000)*IODELAY_WRITE_MICROS);
@ -190,6 +189,27 @@ inline void IO_USEC_write_delay() {
}
}
#define IODELAY_READ_MICROSk (Bit32u)(1024/1.0)
#define IODELAY_WRITE_MICROSk (Bit32u)(1024/0.75)
inline void IO_USEC_read_delay() {
Bitu delaycyc = CPU_CycleMax/IODELAY_READ_MICROSk;
if(CPU_Cycles > delaycyc) {
CPU_Cycles -= delaycyc;
CPU_IODelayRemoved += delaycyc;
} else CPU_Cycles = 0;
}
inline void IO_USEC_write_delay() {
Bitu delaycyc = CPU_CycleMax/IODELAY_WRITE_MICROSk;
if(CPU_Cycles > delaycyc) {
CPU_Cycles -= delaycyc;
CPU_IODelayRemoved += delaycyc;
} else CPU_Cycles = 0;
}
void IO_WriteB(Bitu port,Bitu val) {
if (GCC_UNLIKELY(GETFLAG(VM) && (CPU_IO_Exception(port,1)))) {
LazyFlags old_lflags;