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/*
* Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Hyra nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _MACHINE_LAPICVAR_H_
#define _MACHINE_LAPICVAR_H_
#include <sys/param.h>
/* LAPIC register offsets */
#define LAPIC_ID 0x0020U /* ID Register */
#define LAPIC_VERSION 0x0030U /* Version Register */
#define LAPIC_TPR 0x0080U /* Task Priority Register */
#define LAPIC_APR 0x0090U /* Arbitration Priority Register */
#define LAPIC_PPR 0x00A0U /* Processor Priority Register */
#define LAPIC_EOI 0x00B0U /* End Of Interrupt Register */
#define LAPIC_RRD 0x00C0U /* Remote Read Register */
#define LAPIC_LDR 0x00D0U /* Logical Destination Register */
#define LAPIC_DFR 0x00E0U /* Destination Format Register */
#define LAPIC_SVR 0x00F0U /* Spurious Vector Register */
#define LAPIC_ISR 0x0100U /* In service register (max=0x0220) */
#define LAPIC_TMR 0x0180U /* Trigger Mode Register (max=0x0220) */
#define LAPIC_IRR 0x0200U /* Interrupt Request Register (max=0x0270) */
#define LAPIC_ERR 0x0280U /* Error Status Register */
#define LAPIC_ICRLO 0x0300U /* Interrupt Command Low Register */
#define LAPIC_ICRHI 0x0310U /* Interrupt Command High Register */
#define LAPIC_LVT_TMR 0x0320U /* LVT Timer Register */
#define LAPIC_DCR 0x03E0U /* Divide Configuration Register (for timer) */
#define LAPIC_INIT_CNT 0x0380U /* Initial Count Register (for timer) */
#define LAPIC_CUR_CNT 0x0390U /* Current Count Register (for timer) */
/*
* The x2APIC register space is accessed via
* RDMSR/WRMSR instructions. The below defines
* the base MSR address for the register space.
*/
#define x2APIC_MSR_BASE 0x00000800
/*
* To hardware enable, OR the value of the IA32_APIC_BASE
* MSR with LAPIC_HW_ENABLE and rewrite it.
*
* To software enable, OR the value of the SVR with
* LAPIC_SW_ENABLE and rewrite it.
*
* LAPIC_SW_ENABLE has the low 8 bits set as some hardware
* requires the spurious vector to be hardwired to 1s so
* we'll go with that to be safe.
*/
#define LAPIC_HW_ENABLE BIT(11)
#define LAPIC_SW_ENABLE (BIT(8) | 0xFF)
#define x2APIC_ENABLE_SHIFT 10
/* LVT bits */
#define LAPIC_LVT_MASK BIT(16)
#define LVT_TMR_ONESHOT 0x00
#define LVT_TMR_PERIODIC 0x01
#define LVT_TMR_TSC_DEADLINE 0x02
#endif /* !_MACHINE_LAPICVAR_H_ */
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