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 } 122