54 lines
1.3 KiB
C
54 lines
1.3 KiB
C
/*
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* Copyright (c) 2010-2015 Wind River Systems, Inc.
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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/**
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* @file
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* @brief Disable Intel 8259A PIC (Programmable Interrupt Controller)
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*
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* This module disables the Intel 8259A PIC (Programmable Interrupt Controller)
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* to prevent it from generating spurious interrupts.
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*/
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#include <kernel.h>
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#include <arch/cpu.h>
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#include <toolchain.h>
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#include <linker/sections.h>
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#include <device.h>
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#include <init.h>
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/* programmable interrupt controller info (pair of cascaded 8259A devices) */
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#define PIC_MASTER_BASE_ADRS 0x20
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#define PIC_SLAVE_BASE_ADRS 0xa0
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#define PIC_REG_ADDR_INTERVAL 1
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/* register definitions */
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#define PIC_ADRS(baseAdrs, reg) (baseAdrs + (reg * PIC_REG_ADDR_INTERVAL))
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#define PIC_PORT2(base) PIC_ADRS(base, 0x01) /* port 2 */
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#define PIC_DISABLE 0xff /* Disable PIC command */
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/**
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*
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* @brief Initialize the Intel 8259A PIC device driver
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*
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* This routine disables the 8259A PIC device to prevent it from
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* generating spurious interrupts.
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*
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* @return N/A
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*/
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int _i8259_init(struct device *unused)
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{
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ARG_UNUSED(unused);
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sys_out8(PIC_DISABLE, PIC_PORT2(PIC_SLAVE_BASE_ADRS));
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sys_out8(PIC_DISABLE, PIC_PORT2(PIC_MASTER_BASE_ADRS));
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return 0;
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}
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SYS_INIT(_i8259_init, PRE_KERNEL_1, CONFIG_KERNEL_INIT_PRIORITY_DEFAULT);
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