122 lines
4.4 KiB
C
122 lines
4.4 KiB
C
/*
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* Copyright (c) 2011, Max Filippov, Open Source and Linux Lab.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of the Open Source and Linux Lab nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "qemu/osdep.h"
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#include "cpu.h"
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#include "hw/hw.h"
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#include "qemu/log.h"
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#include "qemu/timer.h"
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void check_interrupts(CPUXtensaState *env)
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{
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CPUState *cs = CPU(xtensa_env_get_cpu(env));
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int minlevel = xtensa_get_cintlevel(env);
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uint32_t int_set_enabled = env->sregs[INTSET] & env->sregs[INTENABLE];
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int level;
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for (level = env->config->nlevel; level > minlevel; --level) {
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if (env->config->level_mask[level] & int_set_enabled) {
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env->pending_irq_level = level;
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cpu_interrupt(cs, CPU_INTERRUPT_HARD);
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qemu_log_mask(CPU_LOG_INT,
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"%s level = %d, cintlevel = %d, "
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"pc = %08x, a0 = %08x, ps = %08x, "
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"intset = %08x, intenable = %08x, "
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"ccount = %08x\n",
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__func__, level, xtensa_get_cintlevel(env),
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env->pc, env->regs[0], env->sregs[PS],
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env->sregs[INTSET], env->sregs[INTENABLE],
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env->sregs[CCOUNT]);
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return;
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}
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}
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env->pending_irq_level = 0;
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cpu_reset_interrupt(cs, CPU_INTERRUPT_HARD);
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}
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static void xtensa_set_irq(void *opaque, int irq, int active)
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{
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CPUXtensaState *env = opaque;
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if (irq >= env->config->ninterrupt) {
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qemu_log("%s: bad IRQ %d\n", __func__, irq);
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} else {
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uint32_t irq_bit = 1 << irq;
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if (active) {
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env->sregs[INTSET] |= irq_bit;
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} else if (env->config->interrupt[irq].inttype == INTTYPE_LEVEL) {
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env->sregs[INTSET] &= ~irq_bit;
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}
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check_interrupts(env);
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}
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}
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void xtensa_timer_irq(CPUXtensaState *env, uint32_t id, uint32_t active)
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{
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qemu_set_irq(env->irq_inputs[env->config->timerint[id]], active);
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}
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static void xtensa_ccompare_cb(void *opaque)
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{
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XtensaCcompareTimer *ccompare = opaque;
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CPUXtensaState *env = ccompare->env;
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unsigned i = ccompare - env->ccompare;
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xtensa_timer_irq(env, i, 1);
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}
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void xtensa_irq_init(CPUXtensaState *env)
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{
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env->irq_inputs = (void **)qemu_allocate_irqs(
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xtensa_set_irq, env, env->config->ninterrupt);
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if (xtensa_option_enabled(env->config, XTENSA_OPTION_TIMER_INTERRUPT)) {
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unsigned i;
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env->time_base = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
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env->ccount_base = env->sregs[CCOUNT];
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for (i = 0; i < env->config->nccompare; ++i) {
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env->ccompare[i].env = env;
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env->ccompare[i].timer = timer_new_ns(QEMU_CLOCK_VIRTUAL,
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xtensa_ccompare_cb, env->ccompare + i);
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}
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}
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}
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void *xtensa_get_extint(CPUXtensaState *env, unsigned extint)
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{
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if (extint < env->config->nextint) {
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unsigned irq = env->config->extint[extint];
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return env->irq_inputs[irq];
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} else {
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qemu_log("%s: trying to acquire invalid external interrupt %d\n",
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__func__, extint);
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return NULL;
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}
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}
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