Chloe M.
37 lines
661 B
C
37 lines
661 B
C
/*
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* Copyright (c) 2026, Chloe M.
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* Provided under the BSD-3 clause.
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*
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* Description: i8254 timer driver
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* Author: Chloe M.
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*/
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#ifndef _MACHINE_I8254_H_
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#define _MACHINE_I8254_H_ 1
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#include <stdef.h>
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#define I8254_COMMAND 0x43
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#define I8254_CHANNEL_0 0x40
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#define I8254_CHANNEL_2 0x42
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#define I8254_DIVIDEND 1193182ULL
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/*
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* Obtain the current counter value
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*/
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USHORT MdPitGetCount(VOID);
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/*
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* Set a new counter value
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*/
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VOID MdPitSetCount(USHORT Value);
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/*
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* Set the PIT counter to match a frequency in Hz
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*
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* @Frequency: Frequency in HZ to set
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*/
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VOID MdPitSetFrequency(UQUAD Frequency);
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#endif /* !_MACHINE_I8254_H_ */
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