diff options
Diffstat (limited to 'src/hw/xtensa/pic_cpu.c')
| -rw-r--r-- | src/hw/xtensa/pic_cpu.c | 166 |
1 files changed, 166 insertions, 0 deletions
diff --git a/src/hw/xtensa/pic_cpu.c b/src/hw/xtensa/pic_cpu.c new file mode 100644 index 0000000..18825d1 --- /dev/null +++ b/src/hw/xtensa/pic_cpu.c @@ -0,0 +1,166 @@ +/* + * Copyright (c) 2011, Max Filippov, Open Source and Linux Lab. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * * Neither the name of the Open Source and Linux Lab nor the + * names of its contributors may be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY + * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; + * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND + * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS + * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include "hw/hw.h" +#include "qemu/log.h" +#include "qemu/timer.h" + +void xtensa_advance_ccount(CPUXtensaState *env, uint32_t d) +{ + uint32_t old_ccount = env->sregs[CCOUNT] + 1; + + env->sregs[CCOUNT] += d; + + if (xtensa_option_enabled(env->config, XTENSA_OPTION_TIMER_INTERRUPT)) { + int i; + for (i = 0; i < env->config->nccompare; ++i) { + if (env->sregs[CCOMPARE + i] - old_ccount < d) { + xtensa_timer_irq(env, i, 1); + } + } + } +} + +void check_interrupts(CPUXtensaState *env) +{ + CPUState *cs = CPU(xtensa_env_get_cpu(env)); + int minlevel = xtensa_get_cintlevel(env); + uint32_t int_set_enabled = env->sregs[INTSET] & env->sregs[INTENABLE]; + int level; + + /* If the CPU is halted advance CCOUNT according to the QEMU_CLOCK_VIRTUAL time + * elapsed since the moment when it was advanced last time. + */ + if (cs->halted) { + int64_t now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); + + xtensa_advance_ccount(env, + muldiv64(now - env->halt_clock, + env->config->clock_freq_khz, 1000000)); + env->halt_clock = now; + } + for (level = env->config->nlevel; level > minlevel; --level) { + if (env->config->level_mask[level] & int_set_enabled) { + env->pending_irq_level = level; + cpu_interrupt(cs, CPU_INTERRUPT_HARD); + qemu_log_mask(CPU_LOG_INT, + "%s level = %d, cintlevel = %d, " + "pc = %08x, a0 = %08x, ps = %08x, " + "intset = %08x, intenable = %08x, " + "ccount = %08x\n", + __func__, level, xtensa_get_cintlevel(env), + env->pc, env->regs[0], env->sregs[PS], + env->sregs[INTSET], env->sregs[INTENABLE], + env->sregs[CCOUNT]); + return; + } + } + env->pending_irq_level = 0; + cpu_reset_interrupt(cs, CPU_INTERRUPT_HARD); +} + +static void xtensa_set_irq(void *opaque, int irq, int active) +{ + CPUXtensaState *env = opaque; + + if (irq >= env->config->ninterrupt) { + qemu_log("%s: bad IRQ %d\n", __func__, irq); + } else { + uint32_t irq_bit = 1 << irq; + + if (active) { + env->sregs[INTSET] |= irq_bit; + } else if (env->config->interrupt[irq].inttype == INTTYPE_LEVEL) { + env->sregs[INTSET] &= ~irq_bit; + } + + check_interrupts(env); + } +} + +void xtensa_timer_irq(CPUXtensaState *env, uint32_t id, uint32_t active) +{ + qemu_set_irq(env->irq_inputs[env->config->timerint[id]], active); +} + +void xtensa_rearm_ccompare_timer(CPUXtensaState *env) +{ + int i; + uint32_t wake_ccount = env->sregs[CCOUNT] - 1; + + for (i = 0; i < env->config->nccompare; ++i) { + if (env->sregs[CCOMPARE + i] - env->sregs[CCOUNT] < + wake_ccount - env->sregs[CCOUNT]) { + wake_ccount = env->sregs[CCOMPARE + i]; + } + } + env->wake_ccount = wake_ccount; + timer_mod(env->ccompare_timer, env->halt_clock + + muldiv64(wake_ccount - env->sregs[CCOUNT], + 1000000, env->config->clock_freq_khz)); +} + +static void xtensa_ccompare_cb(void *opaque) +{ + XtensaCPU *cpu = opaque; + CPUXtensaState *env = &cpu->env; + CPUState *cs = CPU(cpu); + + if (cs->halted) { + env->halt_clock = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); + xtensa_advance_ccount(env, env->wake_ccount - env->sregs[CCOUNT]); + if (!cpu_has_work(cs)) { + env->sregs[CCOUNT] = env->wake_ccount + 1; + xtensa_rearm_ccompare_timer(env); + } + } +} + +void xtensa_irq_init(CPUXtensaState *env) +{ + XtensaCPU *cpu = xtensa_env_get_cpu(env); + + env->irq_inputs = (void **)qemu_allocate_irqs( + xtensa_set_irq, env, env->config->ninterrupt); + if (xtensa_option_enabled(env->config, XTENSA_OPTION_TIMER_INTERRUPT) && + env->config->nccompare > 0) { + env->ccompare_timer = + timer_new_ns(QEMU_CLOCK_VIRTUAL, &xtensa_ccompare_cb, cpu); + } +} + +void *xtensa_get_extint(CPUXtensaState *env, unsigned extint) +{ + if (extint < env->config->nextint) { + unsigned irq = env->config->extint[extint]; + return env->irq_inputs[irq]; + } else { + qemu_log("%s: trying to acquire invalid external interrupt %d\n", + __func__, extint); + return NULL; + } +} |
