See ISA, 4.4.6 (interrupt option), 4.4.7 (high priority interrupt option) and 4.4.8 (timer interrupt option) for details. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
135 lines
4.6 KiB
C
135 lines
4.6 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 "hw.h"
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#include "pc.h"
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#include "qemu-log.h"
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#include "qemu-timer.h"
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/* Stub functions for hardware that doesn't exist. */
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void pic_info(Monitor *mon)
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{
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}
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void irq_info(Monitor *mon)
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{
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}
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void xtensa_advance_ccount(CPUState *env, uint32_t d)
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{
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uint32_t old_ccount = env->sregs[CCOUNT];
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env->sregs[CCOUNT] += d;
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if (xtensa_option_enabled(env->config, XTENSA_OPTION_TIMER_INTERRUPT)) {
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int i;
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for (i = 0; i < env->config->nccompare; ++i) {
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if (env->sregs[CCOMPARE + i] - old_ccount <= d) {
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xtensa_timer_irq(env, i, 1);
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}
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}
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}
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}
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void check_interrupts(CPUState *env)
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{
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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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/* If the CPU is halted advance CCOUNT according to the vm_clock time
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* elapsed since the moment when it was advanced last time.
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*/
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if (env->halted) {
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int64_t now = qemu_get_clock_ns(vm_clock);
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xtensa_advance_ccount(env,
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muldiv64(now - env->halt_clock,
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env->config->clock_freq_khz, 1000000));
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env->halt_clock = now;
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}
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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(env, 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(env, 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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CPUState *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(CPUState *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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CPUState *env = opaque;
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xtensa_advance_ccount(env, env->wake_ccount - env->sregs[CCOUNT]);
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}
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void xtensa_irq_init(CPUState *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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env->config->nccompare > 0) {
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env->ccompare_timer =
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qemu_new_timer_ns(vm_clock, &xtensa_ccompare_cb, env);
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}
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}
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