pit.h File Reference

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Classes
union	_TIMER_CONTROL_PORT_REGISTER

Macros
#define	TIMER_CHANNEL0_DATA_PORT   0x71
#define	TIMER_CHANNEL1_DATA_PORT   0x73
#define	TIMER_CHANNEL2_DATA_PORT   0x75
#define	TIMER_CONTROL_PORT   0x77
#define	TIMER_FREQUENCY_1   1996800 /* 8 MHz */
#define	TIMER_FREQUENCY_2   2457600 /* 10 MHz, 5 MHz */

Typedefs
typedef enum _TIMER_OPERATING_MODES	TIMER_OPERATING_MODES
typedef enum _TIMER_ACCESS_MODES	TIMER_ACCESS_MODES
typedef enum _TIMER_CHANNELS	TIMER_CHANNELS
typedef union _TIMER_CONTROL_PORT_REGISTER	TIMER_CONTROL_PORT_REGISTER
typedef union _TIMER_CONTROL_PORT_REGISTER *	PTIMER_CONTROL_PORT_REGISTER

Enumerations
enum	_TIMER_OPERATING_MODES {   PitOperatingMode0 , PitOperatingMode1 , PitOperatingMode2 , PitOperatingMode3 ,   PitOperatingMode4 , PitOperatingMode5 , PitOperatingMode2Reserved , PitOperatingMode5Reserved ,   PitOperatingMode0 , PitOperatingMode1 , PitOperatingMode2 , PitOperatingMode3 ,   PitOperatingMode4 , PitOperatingMode5 }
enum	_TIMER_ACCESS_MODES {   PitAccessModeCounterLatch , PitAccessModeLow , PitAccessModeHigh , PitAccessModeLowHigh ,   PitAccessModeCounterLatch , PitAccessModeLow , PitAccessModeHigh , PitAccessModeLowHigh }
enum	_TIMER_CHANNELS {   PitChannel0 , PitChannel1 , PitChannel2 , PitReadBack ,   PitChannel0 , PitChannel1 , PitChannel2 , MultipleLatch }

Functions
FORCEINLINE ULONG	Read8253Timer (TIMER_CHANNELS TimerChannel)
FORCEINLINE VOID	Write8253Timer (TIMER_CONTROL_PORT_REGISTER TimerControl, USHORT Count)

Macro Definition Documentation

TIMER_CHANNEL0_DATA_PORT

#define TIMER_CHANNEL0_DATA_PORT   0x71

Definition at line 10 of file pit.h.

TIMER_CHANNEL1_DATA_PORT

#define TIMER_CHANNEL1_DATA_PORT   0x73

Definition at line 11 of file pit.h.

TIMER_CHANNEL2_DATA_PORT

#define TIMER_CHANNEL2_DATA_PORT   0x75

Definition at line 12 of file pit.h.

TIMER_CONTROL_PORT

#define TIMER_CONTROL_PORT   0x77

Definition at line 13 of file pit.h.

TIMER_FREQUENCY_1

#define TIMER_FREQUENCY_1   1996800 /* 8 MHz */

Definition at line 16 of file pit.h.

TIMER_FREQUENCY_2

#define TIMER_FREQUENCY_2   2457600 /* 10 MHz, 5 MHz */

Definition at line 17 of file pit.h.

Typedef Documentation

PTIMER_CONTROL_PORT_REGISTER

typedef union _TIMER_CONTROL_PORT_REGISTER * PTIMER_CONTROL_PORT_REGISTER

TIMER_ACCESS_MODES

typedef enum _TIMER_ACCESS_MODES TIMER_ACCESS_MODES

TIMER_CHANNELS

typedef enum _TIMER_CHANNELS TIMER_CHANNELS

TIMER_CONTROL_PORT_REGISTER

typedef union _TIMER_CONTROL_PORT_REGISTER TIMER_CONTROL_PORT_REGISTER

TIMER_OPERATING_MODES

typedef enum _TIMER_OPERATING_MODES TIMER_OPERATING_MODES

Enumeration Type Documentation

_TIMER_ACCESS_MODES

enum _TIMER_ACCESS_MODES

Enumerator
PitAccessModeCounterLatch
PitAccessModeLow
PitAccessModeHigh
PitAccessModeLowHigh
PitAccessModeCounterLatch
PitAccessModeLow
PitAccessModeHigh
PitAccessModeLowHigh

Definition at line 40 of file pit.h.

{
    PitAccessModeCounterLatch,
    PitAccessModeLow,
    PitAccessModeHigh,
    PitAccessModeLowHigh
} TIMER_ACCESS_MODES;

_TIMER_CHANNELS

enum _TIMER_CHANNELS

Enumerator
PitChannel0
PitChannel1
PitChannel2
PitReadBack
PitChannel0
PitChannel1
PitChannel2
MultipleLatch

Definition at line 48 of file pit.h.

{
    /* IRQ 0 */
    PitChannel0,
 
    /* PC Speaker */
    PitChannel1,
 
    /* RS-232 chipset */
    PitChannel2,
 
    /* Execute multiple latch command */
    MultipleLatch
} TIMER_CHANNELS;

_TIMER_OPERATING_MODES

enum _TIMER_OPERATING_MODES

Enumerator
PitOperatingMode0
PitOperatingMode1
PitOperatingMode2
PitOperatingMode3
PitOperatingMode4
PitOperatingMode5
PitOperatingMode2Reserved
PitOperatingMode5Reserved
PitOperatingMode0
PitOperatingMode1
PitOperatingMode2
PitOperatingMode3
PitOperatingMode4
PitOperatingMode5

Definition at line 19 of file pit.h.

{
    /* Interrupt On Terminal Count */
    PitOperatingMode0,
 
    /* Hardware Re-triggerable One-Shot */
    PitOperatingMode1,
 
    /* Rate Generator */
    PitOperatingMode2,
 
    /* Square Wave Generator */
    PitOperatingMode3,
 
    /* Software Triggered Strobe */
    PitOperatingMode4,
 
    /* Hardware Triggered Strobe */
    PitOperatingMode5
} TIMER_OPERATING_MODES;

Function Documentation

Read8253Timer()

FORCEINLINE ULONG Read8253Timer

(

TIMER_CHANNELS

TimerChannel

)

Definition at line 77 of file pit.h.

{
    ULONG Count;
 
    WRITE_PORT_UCHAR((PUCHAR)TIMER_CONTROL_PORT, (TimerChannel << 6) | PitAccessModeCounterLatch);
    Count = READ_PORT_UCHAR((PUCHAR)(TIMER_CHANNEL0_DATA_PORT + TimerChannel * 2));
    Count |= READ_PORT_UCHAR((PUCHAR)(TIMER_CHANNEL0_DATA_PORT + TimerChannel * 2)) << 8;
 
    return Count;
}

Referenced by HalpCalibrateStallExecution(), and WaitFor8253Wraparound().

Write8253Timer()

FORCEINLINE VOID Write8253Timer	(	TIMER_CONTROL_PORT_REGISTER	TimerControl,
		USHORT	Count
	)

Definition at line 90 of file pit.h.

{
    WRITE_PORT_UCHAR((PUCHAR)TIMER_CONTROL_PORT, TimerControl.Bits);
    WRITE_PORT_UCHAR((PUCHAR)(TIMER_CHANNEL0_DATA_PORT + TimerControl.Channel * 2), Count & 0xFF);
    WRITE_PORT_UCHAR((PUCHAR)(TIMER_CHANNEL0_DATA_PORT + TimerControl.Channel * 2), (Count >> 8) & 0xFF);
}

Referenced by CpSetBaud(), and HalpCalibrateStallExecution().