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 "exec/cpu-interrupt.h" 31 #include "hw/irq.h" 32 #include "qemu/log.h" 33 #include "qemu/timer.h" 34 #include "qemu/atomic.h" 35 36 void check_interrupts(CPUXtensaState *env) 37 { 38 CPUState *cs = env_cpu(env); 39 int minlevel = xtensa_get_cintlevel(env); 40 uint32_t int_set_enabled = env->sregs[INTSET] & 41 (env->sregs[INTENABLE] | env->config->inttype_mask[INTTYPE_NMI]); 42 int level; 43 44 if (minlevel >= env->config->nmi_level) { 45 minlevel = env->config->nmi_level - 1; 46 } 47 for (level = env->config->nlevel; level > minlevel; --level) { 48 if (env->config->level_mask[level] & int_set_enabled) { 49 env->pending_irq_level = level; 50 cpu_interrupt(cs, CPU_INTERRUPT_HARD); 51 qemu_log_mask(CPU_LOG_INT, 52 "%s level = %d, cintlevel = %d, " 53 "pc = %08x, a0 = %08x, ps = %08x, " 54 "intset = %08x, intenable = %08x, " 55 "ccount = %08x\n", 56 __func__, level, xtensa_get_cintlevel(env), 57 env->pc, env->regs[0], env->sregs[PS], 58 env->sregs[INTSET], env->sregs[INTENABLE], 59 env->sregs[CCOUNT]); 60 return; 61 } 62 } 63 env->pending_irq_level = 0; 64 cpu_reset_interrupt(cs, CPU_INTERRUPT_HARD); 65 } 66 67 static void xtensa_set_irq(void *opaque, int irq, int active) 68 { 69 CPUXtensaState *env = opaque; 70 71 if (irq >= env->config->ninterrupt) { 72 qemu_log("%s: bad IRQ %d\n", __func__, irq); 73 } else { 74 uint32_t irq_bit = 1 << irq; 75 76 if (active) { 77 qatomic_or(&env->sregs[INTSET], irq_bit); 78 } else if (env->config->interrupt[irq].inttype == INTTYPE_LEVEL) { 79 qatomic_and(&env->sregs[INTSET], ~irq_bit); 80 } 81 82 check_interrupts(env); 83 } 84 } 85 86 static void xtensa_ccompare_cb(void *opaque) 87 { 88 XtensaCcompareTimer *ccompare = opaque; 89 CPUXtensaState *env = ccompare->env; 90 unsigned i = ccompare - env->ccompare; 91 92 qemu_set_irq(env->irq_inputs[env->config->timerint[i]], 1); 93 } 94 95 static void xtensa_set_runstall(void *opaque, int irq, int active) 96 { 97 CPUXtensaState *env = opaque; 98 xtensa_runstall(env, active); 99 } 100 101 void xtensa_irq_init(CPUXtensaState *env) 102 { 103 unsigned i; 104 105 env->irq_inputs = qemu_allocate_irqs(xtensa_set_irq, env, 106 env->config->ninterrupt); 107 if (xtensa_option_enabled(env->config, XTENSA_OPTION_TIMER_INTERRUPT)) { 108 env->time_base = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); 109 env->ccount_base = env->sregs[CCOUNT]; 110 for (i = 0; i < env->config->nccompare; ++i) { 111 env->ccompare[i].env = env; 112 env->ccompare[i].timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, 113 xtensa_ccompare_cb, env->ccompare + i); 114 } 115 } 116 for (i = 0; i < env->config->nextint; ++i) { 117 unsigned irq = env->config->extint[i]; 118 119 env->ext_irq_inputs[i] = env->irq_inputs[irq]; 120 } 121 env->runstall_irq = qemu_allocate_irq(xtensa_set_runstall, env, 0); 122 } 123 124 qemu_irq *xtensa_get_extints(CPUXtensaState *env) 125 { 126 return env->ext_irq_inputs; 127 } 128 129 qemu_irq xtensa_get_runstall(CPUXtensaState *env) 130 { 131 return env->runstall_irq; 132 } 133