diff options
Diffstat (limited to 'sys/include/arch/amd64/lapicvar.h')
| -rw-r--r-- | sys/include/arch/amd64/lapicvar.h | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/sys/include/arch/amd64/lapicvar.h b/sys/include/arch/amd64/lapicvar.h new file mode 100644 index 0000000..e224e43 --- /dev/null +++ b/sys/include/arch/amd64/lapicvar.h @@ -0,0 +1,85 @@ +/* + * 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_ */ |