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Macros
#define	TIMER0_PORT 0x40

#define	TIMER1_PORT 0x41

#define	TIMER2_PORT 0x42

#define	TIMER_MODE_PORT 0x43

#define	TIMER0_SEL 0x00

#define	TIMER1_SEL 0x40

#define	TIMER2_SEL 0x80

#define	READBACK_SEL 0xC0

#define	LATCH_COUNT 0x00

#define	LOBYTE_ACCESS 0x10

#define	HIBYTE_ACCESS 0x20

#define	WORD_ACCESS 0x30

#define	MODE0 0x00

#define	MODE1 0x02

#define	MODE2 0x04

#define	MODE3 0x06

#define	MODE4 0x08

#define	MODE5 0x0A

#define	BINARY_COUNT 0x00

#define	BCD_COUNT 0x01

#define	TICKS_PER_MS 1193

#define	PPC_PORTB 0x61

#define	PPCB_T2OUT 0x20 /* Bit 5 */

#define	PPCB_SPKR 0x02 /* Bit 1 */

#define	PPCB_T2GATE 0x01 /* Bit 0 */

Functions
void	setup_i8254 (void)

unsigned long	calibrate_tsc_with_pit (void)

Macro Definition Documentation

◆ BCD_COUNT

#define BCD_COUNT 0x01

Definition at line 31 of file i8254.h.

◆ BINARY_COUNT

#define BINARY_COUNT 0x00

Definition at line 30 of file i8254.h.

◆ HIBYTE_ACCESS

#define HIBYTE_ACCESS 0x20

Definition at line 20 of file i8254.h.

◆ LATCH_COUNT

#define LATCH_COUNT 0x00

Definition at line 18 of file i8254.h.

◆ LOBYTE_ACCESS

#define LOBYTE_ACCESS 0x10

Definition at line 19 of file i8254.h.

◆ MODE0

#define MODE0 0x00

Definition at line 23 of file i8254.h.

◆ MODE1

#define MODE1 0x02

Definition at line 24 of file i8254.h.

◆ MODE2

#define MODE2 0x04

Definition at line 25 of file i8254.h.

◆ MODE3

#define MODE3 0x06

Definition at line 26 of file i8254.h.

◆ MODE4

#define MODE4 0x08

Definition at line 27 of file i8254.h.

◆ MODE5

#define MODE5 0x0A

Definition at line 28 of file i8254.h.

◆ PPC_PORTB

#define PPC_PORTB 0x61

Definition at line 37 of file i8254.h.

◆ PPCB_SPKR

#define PPCB_SPKR 0x02 /* Bit 1 */

Definition at line 41 of file i8254.h.

◆ PPCB_T2GATE

#define PPCB_T2GATE 0x01 /* Bit 0 */

Definition at line 42 of file i8254.h.

◆ PPCB_T2OUT

#define PPCB_T2OUT 0x20 /* Bit 5 */

Definition at line 40 of file i8254.h.

◆ READBACK_SEL

#define READBACK_SEL 0xC0

Definition at line 16 of file i8254.h.

◆ TICKS_PER_MS

#define TICKS_PER_MS 1193

Definition at line 34 of file i8254.h.

◆ TIMER0_PORT

#define TIMER0_PORT 0x40

Definition at line 7 of file i8254.h.

◆ TIMER0_SEL

#define TIMER0_SEL 0x00

Definition at line 13 of file i8254.h.

◆ TIMER1_PORT

#define TIMER1_PORT 0x41

Definition at line 8 of file i8254.h.

◆ TIMER1_SEL

#define TIMER1_SEL 0x40

Definition at line 14 of file i8254.h.

◆ TIMER2_PORT

#define TIMER2_PORT 0x42

Definition at line 9 of file i8254.h.

◆ TIMER2_SEL

#define TIMER2_SEL 0x80

Definition at line 15 of file i8254.h.

◆ TIMER_MODE_PORT

#define TIMER_MODE_PORT 0x43

Definition at line 10 of file i8254.h.

◆ WORD_ACCESS

#define WORD_ACCESS 0x30

Definition at line 21 of file i8254.h.

Function Documentation

◆ calibrate_tsc_with_pit()

unsigned long calibrate_tsc_with_pit ( void )

Definition at line 36 of file i8254.c.

References CALIBRATE_DIVISOR, CALIBRATE_INTERVAL, count, DIV_ROUND_UP, tsc_struct::hi, inb(), tsc_struct::lo, outb(), and rdtsc().

Here is the call graph for this function:

◆ setup_i8254()

void setup_i8254 ( void )

Definition at line 10 of file i8254.c.

References BINARY_COUNT, LOBYTE_ACCESS, MODE3, outb(), TIMER0_PORT, TIMER0_SEL, TIMER1_PORT, TIMER1_SEL, TIMER_MODE_PORT, and WORD_ACCESS.

Referenced by lpc_init(), run_bios(), and sc_init().