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