zephyr/include/drivers/loapic.h

/* loapic.h - public LOAPIC APIs */

/*
 * Copyright (c) 2015 Wind River Systems, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef __INCloapich
#define __INCloapich

#ifdef __cplusplus
extern "C" {
#endif

/* Local APIC Register Offset */

#define LOAPIC_ID 0x020		  /* Local APIC ID Reg */
#define LOAPIC_VER 0x030	  /* Local APIC Version Reg */
#define LOAPIC_TPR 0x080	  /* Task Priority Reg */
#define LOAPIC_APR 0x090	  /* Arbitration Priority Reg */
#define LOAPIC_PPR 0x0a0	  /* Processor Priority Reg */
#define LOAPIC_EOI 0x0b0	  /* EOI Reg */
#define LOAPIC_LDR 0x0d0	  /* Logical Destination Reg */
#define LOAPIC_DFR 0x0e0	  /* Destination Format Reg */
#define LOAPIC_SVR 0x0f0	  /* Spurious Interrupt Reg */
#define LOAPIC_ISR 0x100	  /* In-service Reg */
#define LOAPIC_TMR 0x180	  /* Trigger Mode Reg */
#define LOAPIC_IRR 0x200	  /* Interrupt Request Reg */
#define LOAPIC_ESR 0x280	  /* Error Status Reg */
#define LOAPIC_ICRLO 0x300	/* Interrupt Command Reg */
#define LOAPIC_ICRHI 0x310	/* Interrupt Command Reg */
#define LOAPIC_TIMER 0x320	/* LVT (Timer) */
#define LOAPIC_THERMAL 0x330      /* LVT (Thermal) */
#define LOAPIC_PMC 0x340	  /* LVT (PMC) */
#define LOAPIC_LINT0 0x350	/* LVT (LINT0) */
#define LOAPIC_LINT1 0x360	/* LVT (LINT1) */
#define LOAPIC_ERROR 0x370	/* LVT (ERROR) */
#define LOAPIC_TIMER 0x320	/* LVT (Timer) */
#define LOAPIC_TIMER_ICR 0x380    /* Timer Initial Count Reg */
#define LOAPIC_TIMER_CCR 0x390    /* Timer Current Count Reg */
#define LOAPIC_TIMER_CONFIG 0x3e0 /* Timer Divide Config Reg */

/* Local APIC Vector Table Bits */
#define LOAPIC_LVT_MASKED 0x00010000   /* mask */

#ifdef _ASMLANGUAGE
loapic_eoi = (CONFIG_LOAPIC_BASE_ADDRESS + LOAPIC_EOI)

.macro loapic_mkstub device isr context
GTEXT(_\()\device\()_\()\isr\()_stub)

SECTION_FUNC(TEXT, _\()\device\()_\()\isr\()_stub)
	call    _IntEnt          /* Inform kernel interrupt has begun */
	pushl   \context         /* Push context parameter */
	call    \isr             /* Call actual interrupt handler */
	popl    %eax		 /* Clean-up stack from push above */
	xorl	%eax, %eax
	movl	%eax, loapic_eoi /* Inform loapic interrupt is done */
	jmp     _IntExit         /* Inform kernel interrupt is done */
.endm

#else /* _ASMLANGUAGE */
#include <device.h>

extern int _loapic_init(struct device *unused);
extern void _loapic_int_vec_set(unsigned int irq, unsigned int vector);
extern void loapic_int_vec_trigger(unsigned int vector);
extern void _loapic_irq_enable(unsigned int irq);
extern void _loapic_irq_disable(unsigned int irq);
extern void _loapic_enable(void);
extern void _loapic_disable(void);

/**
 *
 * @brief  send EOI (End Of Interrupt) signal to Local APIC
 *
 * This routine sends an EOI signal to the Local APIC's interrupting source.
 *
 * @return N/A
 */
static inline void _loapic_eoi(void)
{
	*(volatile int *)(CONFIG_LOAPIC_BASE_ADDRESS + LOAPIC_EOI) = 0;
}
#endif /* _ASMLANGUAGE */

#ifdef __cplusplus
}
#endif

#endif /* __INCloapich */