claunia/86Box
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

PIT: add alternative faster PIT

Browse Source 
This is enabled by default on 486+ CPUs and can be forced disabled/enabled with pit_mode=0/1
This commit is contained in:
Adrien Moulin
2022-07-23 13:38:10 +02:00
parent 23e082aeea
commit 2aa5d8f5b2
26 changed files with 968 additions and 108 deletions
Download Patch File Download Diff File Expand all files Collapse all files

43
src/include/86box/pit.h
View File

@@ -58,9 +58,33 @@ typedef struct PIT {
uint8_t ctrl;
} pit_t;
enum {
PIT_8253 = 0,
PIT_8254,
PIT_8253_FAST,
PIT_8254_FAST
};
typedef struct {
uint8_t (*read)(uint16_t addr, void *priv);
void (*write)(uint16_t addr, uint8_t val, void *priv);
/* Gets a counter's count. */
uint16_t (*get_count)(void *data, int counter_id);
/* Sets a counter's GATE input. */
void (*set_gate)(void *data, int counter_id, int gate);
/* Sets if a counter's CLOCK input is from the timer or not - used by PCjr. */
void(*set_using_timer)(void *data, int counter_id, int using_timer);
/* Sets a counter's OUT output handler. */
void (*set_out_func)(void *data, int counter_id, void (*func)(int new_out, int old_out));
/* Sets a counter's load count handler. */
void (*set_load_func)(void *data, int counter_id, void (*func)(uint8_t new_m, int new_count));
void (*ctr_clock)(void *data, int counter_id);
void *data;
} pit_intf_t;
extern pit_intf_t pit_devs[2];
extern const pit_intf_t pit_classic_intf;
extern pit_t *pit,
*pit2;
extern double SYSCLK, PCICLK, AGPCLK;
@@ -74,26 +98,13 @@ extern uint64_t PITCONST, ISACONST,
extern int refresh_at_enable;
/* Gets a counter's count. */
extern uint16_t pit_ctr_get_count(ctr_t *ctr);
/* Sets a counter's load count handler. */
extern void pit_ctr_set_load_func(ctr_t *ctr, void (*func)(uint8_t new_m, int new_count));
/* Sets a counter's OUT output handler. */
extern void pit_ctr_set_out_func(ctr_t *ctr, void (*func)(int new_out, int old_out));
/* Sets a counter's GATE input. */
extern void pit_ctr_set_gate(ctr_t *ctr, int gate);
/* Sets a counter's CLOCK input. */
extern void pit_ctr_set_clock(ctr_t *ctr, int clock);
/* Sets if a counter's CLOCK input is from the timer or not - used by PCjr. */
extern void pit_ctr_set_using_timer(ctr_t *ctr, int using_timer);
extern pit_t * pit_common_init(int type, void (*out0)(int new_out, int old_out), void (*out1)(int new_out, int old_out));
extern pit_t * pit_ps2_init(void);
extern pit_t * pit_ps2_init(int type);
extern void pit_reset(pit_t *dev);
extern void pit_irq0_timer(int new_out, int old_out);
extern void pit_irq0_timer_pcjr(int new_out, int old_out);
extern void pit_irq0_timer_ps2(int new_out, int old_out);
extern void pit_refresh_timer_xt(int new_out, int old_out);