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67 lines
1.8 KiB
67 lines
1.8 KiB
/* |
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* Copyright (c) 2010-2015 Wind River Systems, Inc. |
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* |
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* Licensed under the Apache License, Version 2.0 (the "License"); |
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* you may not use this file except in compliance with the License. |
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* You may obtain a copy of the License at |
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* |
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* http://www.apache.org/licenses/LICENSE-2.0 |
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* |
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* Unless required by applicable law or agreed to in writing, software |
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* distributed under the License is distributed on an "AS IS" BASIS, |
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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* See the License for the specific language governing permissions and |
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* limitations under the License. |
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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 <nanokernel.h> |
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#include <arch/cpu.h> |
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#include <toolchain.h> |
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#include <sections.h> |
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#include <device.h> |
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#include <init.h> |
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#include <board.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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DEVICE_INIT(pic_0, "", _i8259_init, |
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NULL, NULL, |
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PRIMARY, CONFIG_KERNEL_INIT_PRIORITY_DEFAULT);
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