39 lines
797 B
C
39 lines
797 B
C
#ifndef PIT_H
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#define PIT_H
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#define BCD_SET 0x1
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#define PIT_MODE_0 (0x0 << 1)
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#define PIT_MODE_1 (0x1 << 1)
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#define PIT_MODE_2 (0x2 << 1)
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#define PIT_MODE_3 (0x3 << 1)
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#define PIT_MODE_4 (0x4 << 1)
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#define PIT_MODE_5 (0x5 << 1)
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#define PIT_RW_SPECIAL (0x0 << 4)
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#define PIT_RW_LSB (0x1 << 4)
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#define PIT_RW_MSB (0x2 << 4)
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#define PIT_RW_LSB_MSB (0x3 << 4)
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#define PIT_SET_COUNTER_0 (0x0 << 6)
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#define PIT_SET_COUNTER_1 (0x1 << 6)
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#define PIT_SET_COUNTER_2 (0x2 << 6)
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// port definition
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#define PIT_COUNTER_0 0x40
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#define PIT_COUNTER_1 0x41
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#define PIT_COUNTER_2 0x42
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#define PIT_CONTROL_REG 0x43
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// to get 100Hz
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#define DIVIDER_LO (11931 & 0xff)
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#define DIVIDER_HI (11931 >> 8)
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#include <stdint.h>
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void pit_handler(void);
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void init_pit(void);
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uint64_t gettick(void);
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#endif
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