47 lines
1.6 KiB
C
47 lines
1.6 KiB
C
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/*
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* Copyright 2008, Dustin Howett, dustin.howett@gmail.com. All rights reserved.
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* Distributed under the terms of the MIT License.
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*/
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#ifndef _KERNEL_ARCH_x86_HPET_H
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#define _KERNEL_ARCH_x86_HPET_H
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/* All masks are 64 bits wide to represent bit locations;
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the HPET registers are 64 bits wide. */
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/* Global Capability Register Masks */
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#define HPET_CAP_MASK_ID 0x00000000000000FF
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#define HPET_CAP_MASK_NUMTIMERS 0x0000000000001F00
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#define HPET_CAP_MASK_WIDTH 0x0000000000002000
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#define HPET_CAP_MASK_LEGACY 0x0000000000008000
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#define HPET_CAP_MASK_VENDOR_ID 0x00000000FFFF0000
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#define HPET_CAP_MASK_PERIOD 0xFFFFFFFF00000000
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/* Retrieve Global Capabilities */
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#define HPET_GET_ID(regs) ((regs)->caps & HPET_CAP_MASK_ID)
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#define HPET_GET_NUM_TIMERS(regs) (((regs)->caps & HPET_CAP_MASK_NUMTIMERS) >> 8)
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#define HPET_IS_64BIT_CAPABLE(regs) (((regs)->caps & HPET_CAP_MASK_WIDTH) >> 13)
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#define HPET_IS_LEGACY_CAPABLE(regs) (((regs)->caps & HPET_CAP_MASK_LEGACY) >> 15)
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#define HPET_GET_VENDOR_ID(regs) (((regs)->caps & HPET_CAP_MASK_VENDOR_ID) >> 16)
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#define HPET_GET_PERIOD(regs) (((regs)->caps & HPET_CAP_MASK_PERIOD) >> 32)
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struct hpet_timer {
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uint64 config, /* Timer configuration and capabilities */
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uint64 comparator, /* Comparator value */
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uint64 introute, /* FSB Interrupt Routing */
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uint64 reserved
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};
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struct hpet_regs {
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uint64 caps, /* HPET Capabilities and ID */
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uint64 reserved1,
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uint64 config, /* General Configuration */
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uint64 reserved2,
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uint64 intstatus, /* General Interrupt Status */
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uint8 reserved3[200],
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uint64 mainvalue, /* Main Counter Value */
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uint64 reserved3,
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struct hpet_timer timers[1] /* Timers */
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};
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#endif
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