73 lines
1.8 KiB
C
73 lines
1.8 KiB
C
/*
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* Copyright (c) 2016 Jean-Paul Etienne <fractalclone@gmail.com>
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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 riscv32-qemu interrupt management code
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*/
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#include <irq.h>
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#include <soc.h>
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void _arch_irq_enable(unsigned int irq)
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{
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uint32_t mie;
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/*
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* Since only internal Timer device has interrupt within in
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* riscv32-qemu, use only mie CSR register to enable device interrupt.
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* CSR mie register is updated using atomic instruction csrrs
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* (atomic read and set bits in CSR register)
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*/
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__asm__ volatile ("csrrs %0, mie, %1\n"
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: "=r" (mie)
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: "r" (1 << irq));
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}
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void _arch_irq_disable(unsigned int irq)
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{
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uint32_t mie;
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/*
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* Use atomic instruction csrrc to disable device interrupt in mie CSR.
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* (atomic read and clear bits in CSR register)
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*/
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__asm__ volatile ("csrrc %0, mie, %1\n"
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: "=r" (mie)
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: "r" (1 << irq));
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};
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int _arch_irq_is_enabled(unsigned int irq)
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{
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uint32_t mie;
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__asm__ volatile ("csrr %0, mie" : "=r" (mie));
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return !!(mie & (1 << irq));
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}
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#if defined(CONFIG_RISCV_SOC_INTERRUPT_INIT)
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void soc_interrupt_init(void)
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{
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/* ensure that all interrupts are disabled */
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(void)irq_lock();
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__asm__ volatile ("csrwi mie, 0\n"
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"csrwi sie, 0\n"
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"csrwi mip, 0\n"
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"csrwi sip, 0\n");
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}
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#endif
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