hw/xtensa/pic_cpu.c

   1 /*
   2  * Copyright (c) 2011, Max Filippov, Open Source and Linux Lab.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are met:
   7  *     * Redistributions of source code must retain the above copyright
   8  *       notice, this list of conditions and the following disclaimer.
   9  *     * Redistributions in binary form must reproduce the above copyright
  10  *       notice, this list of conditions and the following disclaimer in the
  11  *       documentation and/or other materials provided with the distribution.
  12  *     * Neither the name of the Open Source and Linux Lab nor the
  13  *       names of its contributors may be used to endorse or promote products
  14  *       derived from this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  17  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
  20  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  21  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  22  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  23  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  25  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26  */
  27
  28 #include "qemu/osdep.h"
  29 #include "cpu.h"
  30 #include "hw/hw.h"
  31 #include "qemu/log.h"
  32 #include "qemu/timer.h"
  33
  34 void check_interrupts(CPUXtensaState *env)
  35 {
  36     CPUState *cs = CPU(xtensa_env_get_cpu(env));
  37     int minlevel = xtensa_get_cintlevel(env);
  38     uint32_t int_set_enabled = env->sregs[INTSET] & env->sregs[INTENABLE];
  39     int level;
  40
  41     for (level = env->config->nlevel; level > minlevel; --level) {
  42         if (env->config->level_mask[level] & int_set_enabled) {
  43             env->pending_irq_level = level;
  44             cpu_interrupt(cs, CPU_INTERRUPT_HARD);
  45             qemu_log_mask(CPU_LOG_INT,
  46                     "%s level = %d, cintlevel = %d, "
  47                     "pc = %08x, a0 = %08x, ps = %08x, "
  48                     "intset = %08x, intenable = %08x, "
  49                     "ccount = %08x\n",
  50                     __func__, level, xtensa_get_cintlevel(env),
  51                     env->pc, env->regs[0], env->sregs[PS],
  52                     env->sregs[INTSET], env->sregs[INTENABLE],
  53                     env->sregs[CCOUNT]);
  54             return;
  55         }
  56     }
  57     env->pending_irq_level = 0;
  58     cpu_reset_interrupt(cs, CPU_INTERRUPT_HARD);
  59 }
  60
  61 static void xtensa_set_irq(void *opaque, int irq, int active)
  62 {
  63     CPUXtensaState *env = opaque;
  64
  65     if (irq >= env->config->ninterrupt) {
  66         qemu_log("%s: bad IRQ %d\n", __func__, irq);
  67     } else {
  68         uint32_t irq_bit = 1 << irq;
  69
  70         if (active) {
  71             env->sregs[INTSET] |= irq_bit;
  72         } else if (env->config->interrupt[irq].inttype == INTTYPE_LEVEL) {
  73             env->sregs[INTSET] &= ~irq_bit;
  74         }
  75
  76         check_interrupts(env);
  77     }
  78 }
  79
  80 void xtensa_timer_irq(CPUXtensaState *env, uint32_t id, uint32_t active)
  81 {
  82     qemu_set_irq(env->irq_inputs[env->config->timerint[id]], active);
  83 }
  84
  85 static void xtensa_ccompare_cb(void *opaque)
  86 {
  87     XtensaCcompareTimer *ccompare = opaque;
  88     CPUXtensaState *env = ccompare->env;
  89     unsigned i = ccompare - env->ccompare;
  90
  91     xtensa_timer_irq(env, i, 1);
  92 }
  93
  94 void xtensa_irq_init(CPUXtensaState *env)
  95 {
  96     env->irq_inputs = (void **)qemu_allocate_irqs(
  97             xtensa_set_irq, env, env->config->ninterrupt);
  98     if (xtensa_option_enabled(env->config, XTENSA_OPTION_TIMER_INTERRUPT)) {
  99         unsigned i;
 100
 101         env->time_base = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
 102         env->ccount_base = env->sregs[CCOUNT];
 103         for (i = 0; i < env->config->nccompare; ++i) {
 104             env->ccompare[i].env = env;
 105             env->ccompare[i].timer = timer_new_ns(QEMU_CLOCK_VIRTUAL,
 106                     xtensa_ccompare_cb, env->ccompare + i);
 107         }
 108     }
 109 }
 110
 111 void *xtensa_get_extint(CPUXtensaState *env, unsigned extint)
 112 {
 113     if (extint < env->config->nextint) {
 114         unsigned irq = env->config->extint[extint];
 115         return env->irq_inputs[irq];
 116     } else {
 117         qemu_log("%s: trying to acquire invalid external interrupt %d\n",
 118                 __func__, extint);
 119         return NULL;
 120     }
 121 }