diff options
| author | rsc <rsc> | 2006-09-08 14:41:18 +0000 |
|---|---|---|
| committer | rsc <rsc> | 2006-09-08 14:41:18 +0000 |
| commit | 5eb6212dfef41a016bfcb214d84236c02828da2c (patch) | |
| tree | f73bcc7d4fc24a270f583bf2d820d10d6ac04c3f | |
| parent | db2d8e4b8271aade61c1365aafdaf4e41909994e (diff) | |
| download | xv6-labs-5eb6212dfef41a016bfcb214d84236c02828da2c.tar.gz xv6-labs-5eb6212dfef41a016bfcb214d84236c02828da2c.tar.bz2 xv6-labs-5eb6212dfef41a016bfcb214d84236c02828da2c.zip | |
xv6 style
| -rw-r--r-- | 8253pit.c | 45 |
1 files changed, 22 insertions, 23 deletions
@@ -6,34 +6,33 @@ // Register definitions for the Intel // 8253/8254/82C54 Programmable Interval Timer (PIT). -#define IO_TIMER1 0x040 /* 8253 Timer #1 */ -#define IO_TIMER2 0x048 /* 8253 Timer #2 (EISA only) */ +#define IO_TIMER1 0x040 // 8253 Timer #1 +#define IO_TIMER2 0x048 // 8253 Timer #2 (EISA only) -// // Frequency of all three count-down timers; (TIMER_FREQ/freq) is the // appropriate count to generate a frequency of freq hz. -#define TIMER_FREQ 1193182 -#define TIMER_DIV(x) ((TIMER_FREQ+(x)/2)/(x)) +#define TIMER_FREQ 1193182 +#define TIMER_DIV(x) ((TIMER_FREQ+(x)/2)/(x)) -#define TIMER_CNTR0 (IO_TIMER1 + 0) /* timer 0 counter port */ -#define TIMER_CNTR1 (IO_TIMER1 + 1) /* timer 1 counter port */ -#define TIMER_CNTR2 (IO_TIMER1 + 2) /* timer 2 counter port */ -#define TIMER_MODE (IO_TIMER1 + 3) /* timer mode port */ -#define TIMER_SEL0 0x00 /* select counter 0 */ -#define TIMER_SEL1 0x40 /* select counter 1 */ -#define TIMER_SEL2 0x80 /* select counter 2 */ -#define TIMER_INTTC 0x00 /* mode 0, intr on terminal cnt */ -#define TIMER_ONESHOT 0x02 /* mode 1, one shot */ -#define TIMER_RATEGEN 0x04 /* mode 2, rate generator */ -#define TIMER_SQWAVE 0x06 /* mode 3, square wave */ -#define TIMER_SWSTROBE 0x08 /* mode 4, s/w triggered strobe */ -#define TIMER_HWSTROBE 0x0a /* mode 5, h/w triggered strobe */ -#define TIMER_LATCH 0x00 /* latch counter for reading */ -#define TIMER_LSB 0x10 /* r/w counter LSB */ -#define TIMER_MSB 0x20 /* r/w counter MSB */ -#define TIMER_16BIT 0x30 /* r/w counter 16 bits, LSB first */ -#define TIMER_BCD 0x01 /* count in BCD */ +#define TIMER_CNTR0 (IO_TIMER1 + 0) // timer 0 counter port +#define TIMER_CNTR1 (IO_TIMER1 + 1) // timer 1 counter port +#define TIMER_CNTR2 (IO_TIMER1 + 2) // timer 2 counter port +#define TIMER_MODE (IO_TIMER1 + 3) // timer mode port +#define TIMER_SEL0 0x00 // select counter 0 +#define TIMER_SEL1 0x40 // select counter 1 +#define TIMER_SEL2 0x80 // select counter 2 +#define TIMER_INTTC 0x00 // mode 0, intr on terminal cnt +#define TIMER_ONESHOT 0x02 // mode 1, one shot +#define TIMER_RATEGEN 0x04 // mode 2, rate generator +#define TIMER_SQWAVE 0x06 // mode 3, square wave +#define TIMER_SWSTROBE 0x08 // mode 4, s/w triggered strobe +#define TIMER_HWSTROBE 0x0a // mode 5, h/w triggered strobe +#define TIMER_LATCH 0x00 // latch counter for reading +#define TIMER_LSB 0x10 // r/w counter LSB +#define TIMER_MSB 0x20 // r/w counter MSB +#define TIMER_16BIT 0x30 // r/w counter 16 bits, LSB first +#define TIMER_BCD 0x01 // count in BCD void pit8253_timerinit(void) |