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Add hardware timer definitions for PIT and ACPI PM
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This commit is contained in:
Aiken Harris
2026-04-28 12:28:33 +02:00
parent 165e82f78b
commit 49fde5adbd
3 changed files with 48 additions and 1 deletions
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22
sdk/xtdk/amd64/hltypes.h
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@@ -109,6 +109,28 @@
#define PIT_DATA_PORT1 0x41
#define PIT_DATA_PORT2 0x42
/* PIT related definitions */
#define PIT_BASE_FREQUENCY 1193182
/* PIT Access Mode: Defines how the CPU reads or writes the counter value */
#define PIT_CMD_ACCESS_LATCH 0x00
#define PIT_CMD_ACCESS_LOWBYTE_ONLY 0x10
#define PIT_CMD_ACCESS_HIGHBYTE_ONLY 0x20
#define PIT_CMD_ACCESS_LOWBYTE_HIGHBYTE 0x30
/* PIT Channel Selection: Specifies the physical timer channel to configure */
#define PIT_CMD_CHANNEL0 0x00
#define PIT_CMD_CHANNEL1 0x40
#define PIT_CMD_CHANNEL2 0x80
/* PIT Operating Mode: Defines the hardware behavior and the generated waveform */
#define PIT_MODE0_INT_ON_TERMINAL_COUNT 0x00
#define PIT_MODE1_ONESHOT 0x02
#define PIT_MODE2_RATE_GENERATOR 0x04
#define PIT_MODE3_SQUARE_WAVE_GEN 0x06
#define PIT_MODE4_SOFTWARE_STROBE 0x08
#define PIT_MODE5_HARDWARE_STROBE 0x0A
/* CMOS controller access ports */
#define CMOS_SELECT_PORT 0x70
#define CMOS_DATA_PORT 0x71