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path: root/src/glut/dos/PC_HW/pc_timer.c
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Diffstat (limited to 'src/glut/dos/PC_HW/pc_timer.c')
-rw-r--r--src/glut/dos/PC_HW/pc_timer.c462
1 files changed, 231 insertions, 231 deletions
diff --git a/src/glut/dos/PC_HW/pc_timer.c b/src/glut/dos/PC_HW/pc_timer.c
index 530ed72a49..e7cbe70a1f 100644
--- a/src/glut/dos/PC_HW/pc_timer.c
+++ b/src/glut/dos/PC_HW/pc_timer.c
@@ -1,7 +1,7 @@
/*
* PC/HW routine collection v1.5 for DOS/DJGPP
*
- * Copyright (C) 2002 - Borca Daniel
+ * Copyright (C) 2002 - Daniel Borca
* Email : dborca@yahoo.com
* Web : http://www.geocities.com/dborca
*/
@@ -25,15 +25,14 @@
static int timer_installed;
typedef struct {
- volatile unsigned int counter, clock_ticks, freq;
- volatile PFUNC func;
- volatile void *parm;
+ volatile unsigned int counter, clock_ticks, freq;
+ volatile PFUNC func;
+ volatile void *parm;
} TIMER;
static TIMER timer_main, timer_func[MAX_TIMERS];
-
/* Desc: main timer callback
*
* In : -
@@ -41,33 +40,33 @@ static TIMER timer_main, timer_func[MAX_TIMERS];
*
* Note: -
*/
-static int timer ()
+static int
+timer ()
{
- int i;
-
- for (i = 0; i < MAX_TIMERS; i++) {
- TIMER *t = &timer_func[i];
- if (t->func) {
- t->clock_ticks += t->counter;
- if (t->clock_ticks >= timer_main.counter) {
- t->clock_ticks -= timer_main.counter;
- t->func(unvolatile(t->parm, void *));
- }
- }
- }
-
- timer_main.clock_ticks += timer_main.counter;
- if (timer_main.clock_ticks >= 0x10000) {
- timer_main.clock_ticks -= 0x10000;
- return 1;
- } else {
- outportb(0x20, 0x20);
- return 0;
- }
+ int i;
+
+ for (i = 0; i < MAX_TIMERS; i++) {
+ TIMER *t = &timer_func[i];
+ if (t->func) {
+ t->clock_ticks += t->counter;
+ if (t->clock_ticks >= timer_main.counter) {
+ t->clock_ticks -= timer_main.counter;
+ t->func(unvolatile(t->parm, void *));
+ }
+ }
+ }
+
+ timer_main.clock_ticks += timer_main.counter;
+ if (timer_main.clock_ticks >= 0x10000) {
+ timer_main.clock_ticks -= 0x10000;
+ return 1;
+ } else {
+ outportb(0x20, 0x20);
+ return 0;
+ }
} ENDOFUNC(timer)
-
/* Desc: uninstall timer engine
*
* In : -
@@ -75,24 +74,24 @@ static int timer ()
*
* Note: -
*/
-void pc_remove_timer (void)
+void
+pc_remove_timer (void)
{
- if (timer_installed) {
- timer_installed = FALSE;
- pc_clexit(pc_remove_timer);
-
- DISABLE();
- outportb(0x43, 0x34);
- outportb(0x40, 0);
- outportb(0x40, 0);
- ENABLE();
-
- pc_remove_irq(TIMER_IRQ);
- }
+ if (timer_installed) {
+ timer_installed = FALSE;
+ pc_clexit(pc_remove_timer);
+
+ DISABLE();
+ outportb(0x43, 0x34);
+ outportb(0x40, 0);
+ outportb(0x40, 0);
+ ENABLE();
+
+ pc_remove_irq(TIMER_IRQ);
+ }
}
-
/* Desc: remove timerfunc
*
* In : timerfunc id
@@ -100,65 +99,65 @@ void pc_remove_timer (void)
*
* Note: tries to relax the main timer whenever possible
*/
-int pc_remove_int (int fid)
+int
+pc_remove_int (int fid)
{
- int i;
- unsigned int freq = 0;
-
- /* are we installed? */
- if (!timer_installed) {
- return -1;
- }
-
- /* sanity check */
- if ((fid < 0) || (fid >= MAX_TIMERS) || (timer_func[fid].func == NULL)) {
- return -1;
- }
- timer_func[fid].func = NULL;
-
- /* scan for maximum frequency */
- for (i = 0; i < MAX_TIMERS; i++) {
- TIMER *t = &timer_func[i];
- if (t->func) {
- if (freq < t->freq) {
- freq = t->freq;
- }
- }
- }
-
- /* if there are no callbacks left, cleanup */
- if (!freq) {
- pc_remove_timer();
- return 0;
- }
-
- /* if we just lowered the maximum frequency, try to relax the timer engine */
- if (freq < timer_main.freq) {
- unsigned int new_counter = PIT_FREQ / freq;
-
- DISABLE();
-
- for (i = 0; i < MAX_TIMERS; i++) {
- if (timer_func[i].func) {
- ADJUST(timer_func[i], freq);
- }
- }
-
- outportb(0x43, 0x34);
- outportb(0x40, (unsigned char)new_counter);
- outportb(0x40, (unsigned char)(new_counter>>8));
- timer_main.clock_ticks = 0;
- timer_main.counter = new_counter;
- timer_main.freq = freq;
-
- ENABLE();
- }
+ int i;
+ unsigned int freq = 0;
+
+ /* are we installed? */
+ if (!timer_installed) {
+ return -1;
+ }
+
+ /* sanity check */
+ if ((fid < 0) || (fid >= MAX_TIMERS) || (timer_func[fid].func == NULL)) {
+ return -1;
+ }
+ timer_func[fid].func = NULL;
+
+ /* scan for maximum frequency */
+ for (i = 0; i < MAX_TIMERS; i++) {
+ TIMER *t = &timer_func[i];
+ if (t->func) {
+ if (freq < t->freq) {
+ freq = t->freq;
+ }
+ }
+ }
+
+ /* if there are no callbacks left, cleanup */
+ if (!freq) {
+ pc_remove_timer();
+ return 0;
+ }
+
+ /* if we just lowered the maximum frequency, try to relax the timer engine */
+ if (freq < timer_main.freq) {
+ unsigned int new_counter = PIT_FREQ / freq;
+
+ DISABLE();
+
+ for (i = 0; i < MAX_TIMERS; i++) {
+ if (timer_func[i].func) {
+ ADJUST(timer_func[i], freq);
+ }
+ }
+
+ outportb(0x43, 0x34);
+ outportb(0x40, (unsigned char)new_counter);
+ outportb(0x40, (unsigned char)(new_counter>>8));
+ timer_main.clock_ticks = 0;
+ timer_main.counter = new_counter;
+ timer_main.freq = freq;
+
+ ENABLE();
+ }
- return 0;
+ return 0;
} ENDOFUNC(pc_remove_int)
-
/* Desc: adjust timerfunc
*
* In : timerfunc id, new frequency (Hz)
@@ -166,64 +165,64 @@ int pc_remove_int (int fid)
*
* Note: might change the main timer frequency
*/
-int pc_adjust_int (int fid, unsigned int freq)
+int
+pc_adjust_int (int fid, unsigned int freq)
{
- int i;
-
- /* are we installed? */
- if (!timer_installed) {
- return -1;
- }
-
- /* sanity check */
- if ((fid < 0) || (fid >= MAX_TIMERS) || (timer_func[fid].func == NULL)) {
- return -1;
- }
- timer_func[fid].freq = freq;
-
- /* scan for maximum frequency */
- freq = 0;
- for (i = 0; i < MAX_TIMERS; i++) {
- TIMER *t = &timer_func[i];
- if (t->func) {
- if (freq < t->freq) {
- freq = t->freq;
- }
- }
- }
-
- /* update main timer / sons to match highest frequency */
- DISABLE();
-
- /* using '>' is correct still (and avoids updating
- * the HW timer too often), but doesn't relax the timer!
- */
- if (freq != timer_main.freq) {
- unsigned int new_counter = PIT_FREQ / freq;
-
- for (i = 0; i < MAX_TIMERS; i++) {
- if (timer_func[i].func) {
- ADJUST(timer_func[i], freq);
- }
- }
-
- outportb(0x43, 0x34);
- outportb(0x40, (unsigned char)new_counter);
- outportb(0x40, (unsigned char)(new_counter>>8));
- timer_main.clock_ticks = 0;
- timer_main.counter = new_counter;
- timer_main.freq = freq;
- } else {
- ADJUST(timer_func[fid], timer_main.freq);
- }
-
- ENABLE();
-
- return 0;
+ int i;
+
+ /* are we installed? */
+ if (!timer_installed) {
+ return -1;
+ }
+
+ /* sanity check */
+ if ((fid < 0) || (fid >= MAX_TIMERS) || (timer_func[fid].func == NULL)) {
+ return -1;
+ }
+ timer_func[fid].freq = freq;
+
+ /* scan for maximum frequency */
+ freq = 0;
+ for (i = 0; i < MAX_TIMERS; i++) {
+ TIMER *t = &timer_func[i];
+ if (t->func) {
+ if (freq < t->freq) {
+ freq = t->freq;
+ }
+ }
+ }
+
+ /* update main timer / sons to match highest frequency */
+ DISABLE();
+
+ /* using '>' is correct still (and avoids updating
+ * the HW timer too often), but doesn't relax the timer!
+ */
+ if (freq != timer_main.freq) {
+ unsigned int new_counter = PIT_FREQ / freq;
+
+ for (i = 0; i < MAX_TIMERS; i++) {
+ if (timer_func[i].func) {
+ ADJUST(timer_func[i], freq);
+ }
+ }
+
+ outportb(0x43, 0x34);
+ outportb(0x40, (unsigned char)new_counter);
+ outportb(0x40, (unsigned char)(new_counter>>8));
+ timer_main.clock_ticks = 0;
+ timer_main.counter = new_counter;
+ timer_main.freq = freq;
+ } else {
+ ADJUST(timer_func[fid], timer_main.freq);
+ }
+
+ ENABLE();
+
+ return 0;
} ENDOFUNC(pc_adjust_int)
-
/* Desc: install timer engine
*
* In : -
@@ -231,36 +230,36 @@ int pc_adjust_int (int fid, unsigned int freq)
*
* Note: initial frequency is 18.2 Hz
*/
-static int install_timer (void)
+static int
+install_timer (void)
{
- if (timer_installed || pc_install_irq(TIMER_IRQ, timer)) {
- return -1;
- } else {
- memset(timer_func, 0, sizeof(timer_func));
-
- LOCKDATA(timer_func);
- LOCKDATA(timer_main);
- LOCKFUNC(timer);
- LOCKFUNC(pc_adjust_int);
- LOCKFUNC(pc_remove_int);
-
- timer_main.counter = 0x10000;
-
- DISABLE();
- outportb(0x43, 0x34);
- outportb(0x40, 0);
- outportb(0x40, 0);
- timer_main.clock_ticks = 0;
- ENABLE();
-
- pc_atexit(pc_remove_timer);
- timer_installed = TRUE;
- return 0;
- }
+ if (timer_installed || pc_install_irq(TIMER_IRQ, timer)) {
+ return -1;
+ } else {
+ memset(timer_func, 0, sizeof(timer_func));
+
+ LOCKDATA(timer_func);
+ LOCKDATA(timer_main);
+ LOCKFUNC(timer);
+ LOCKFUNC(pc_adjust_int);
+ LOCKFUNC(pc_remove_int);
+
+ timer_main.counter = 0x10000;
+
+ DISABLE();
+ outportb(0x43, 0x34);
+ outportb(0x40, 0);
+ outportb(0x40, 0);
+ timer_main.clock_ticks = 0;
+ ENABLE();
+
+ pc_atexit(pc_remove_timer);
+ timer_installed = TRUE;
+ return 0;
+ }
}
-
/* Desc: install timerfunc
*
* In : callback function, opaque pointer to be passed to callee, freq (Hz)
@@ -268,60 +267,61 @@ static int install_timer (void)
*
* Note: returns -1 if error
*/
-int pc_install_int (PFUNC func, void *parm, unsigned int freq)
+int
+pc_install_int (PFUNC func, void *parm, unsigned int freq)
{
- int i;
- TIMER *t = NULL;
-
- /* ensure the timer engine is set up */
- if (!timer_installed) {
- if (install_timer()) {
- return -1;
- }
- }
-
- /* find an empty slot */
- for (i = 0; i < MAX_TIMERS; i++) {
- if (!timer_func[i].func) {
- t = &timer_func[i];
- break;
- }
- }
- if (t == NULL) {
- return -1;
- }
-
- DISABLE();
-
- t->func = func;
- t->parm = parm;
- t->freq = freq;
- t->clock_ticks = 0;
-
- /* update main timer / sons to match highest frequency */
- if (freq > timer_main.freq) {
- unsigned int new_counter = PIT_FREQ / freq;
-
- for (i = 0; i < MAX_TIMERS; i++) {
- if (timer_func[i].func) {
- ADJUST(timer_func[i], freq);
- }
- }
-
- outportb(0x43, 0x34);
- outportb(0x40, (unsigned char)new_counter);
- outportb(0x40, (unsigned char)(new_counter>>8));
- timer_main.clock_ticks = 0;
- timer_main.counter = new_counter;
- timer_main.freq = freq;
- } else {
- /* t == &timer_func[i] */
- ADJUST(timer_func[i], timer_main.freq);
- }
-
- i = t - timer_func;
-
- ENABLE();
-
- return i;
+ int i;
+ TIMER *t = NULL;
+
+ /* ensure the timer engine is set up */
+ if (!timer_installed) {
+ if (install_timer()) {
+ return -1;
+ }
+ }
+
+ /* find an empty slot */
+ for (i = 0; i < MAX_TIMERS; i++) {
+ if (!timer_func[i].func) {
+ t = &timer_func[i];
+ break;
+ }
+ }
+ if (t == NULL) {
+ return -1;
+ }
+
+ DISABLE();
+
+ t->func = func;
+ t->parm = parm;
+ t->freq = freq;
+ t->clock_ticks = 0;
+
+ /* update main timer / sons to match highest frequency */
+ if (freq > timer_main.freq) {
+ unsigned int new_counter = PIT_FREQ / freq;
+
+ for (i = 0; i < MAX_TIMERS; i++) {
+ if (timer_func[i].func) {
+ ADJUST(timer_func[i], freq);
+ }
+ }
+
+ outportb(0x43, 0x34);
+ outportb(0x40, (unsigned char)new_counter);
+ outportb(0x40, (unsigned char)(new_counter>>8));
+ timer_main.clock_ticks = 0;
+ timer_main.counter = new_counter;
+ timer_main.freq = freq;
+ } else {
+ /* t == &timer_func[i] */
+ ADJUST(timer_func[i], timer_main.freq);
+ }
+
+ i = t - timer_func;
+
+ ENABLE();
+
+ return i;
}
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