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/*
* Copyright (c) 2018 Richard Braun.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
#include <stdint.h>
#include "cpu.h"
#include "nvic.h"
#define NVIC_BASE_ADDR 0xe000e100
struct nvic_regs {
uint32_t iser[16];
uint32_t icer[16];
uint32_t ispr[16];
uint32_t icpr[16];
uint32_t iabr[16];
uint32_t reserved[47];
uint32_t ipr[124];
};
static volatile struct nvic_regs *nvic_regs = (void *)NVIC_BASE_ADDR;
static void
nvic_get_dest(unsigned int irq, volatile uint32_t *array,
volatile uint32_t **reg, uint32_t *mask)
{
*reg = &array[irq / 32];
*mask = (1 << (irq % 32));
}
void
nvic_irq_enable(unsigned int irq)
{
volatile uint32_t *reg;
uint32_t mask;
uint32_t primask;
nvic_get_dest(irq, nvic_regs->iser, ®, &mask);
primask = cpu_intr_save();
*reg |= mask;
cpu_intr_restore(primask);
}
void
nvic_irq_disable(unsigned int irq)
{
volatile uint32_t *reg;
uint32_t mask;
uint32_t primask;
nvic_get_dest(irq, nvic_regs->icer, ®, &mask);
primask = cpu_intr_save();
*reg |= mask;
cpu_intr_restore(primask);
}
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