| // Definitions for the Intel 8253 Programmable Interrupt Timer (PIT). |
| #ifndef __PIT_H |
| #define __PIT_H |
| |
| // Bits for PORT_PIT_MODE |
| #define PM_SEL_TIMER0 (0<<6) |
| #define PM_SEL_TIMER1 (1<<6) |
| #define PM_SEL_TIMER2 (2<<6) |
| #define PM_SEL_READBACK (3<<6) |
| #define PM_ACCESS_LATCH (0<<4) |
| #define PM_ACCESS_LOBYTE (1<<4) |
| #define PM_ACCESS_HIBYTE (2<<4) |
| #define PM_ACCESS_WORD (3<<4) |
| #define PM_MODE0 (0<<1) |
| #define PM_MODE1 (1<<1) |
| #define PM_MODE2 (2<<1) |
| #define PM_MODE3 (3<<1) |
| #define PM_MODE4 (4<<1) |
| #define PM_MODE5 (5<<1) |
| #define PM_CNT_BINARY (0<<0) |
| #define PM_CNT_BCD (1<<0) |
| #define PM_READ_COUNTER0 (1<<1) |
| #define PM_READ_COUNTER1 (1<<2) |
| #define PM_READ_COUNTER2 (1<<3) |
| #define PM_READ_STATUSVALUE (0<<4) |
| #define PM_READ_VALUE (1<<4) |
| #define PM_READ_STATUS (2<<4) |
| |
| #endif // pit.h |
