From 7ccda78ff3a1c4d7005eb211207ca11ed719cc11 Mon Sep 17 00:00:00 2001 From: Michael Rolnik Date: Fri, 7 Feb 2020 00:20:49 +0100 Subject: target/avr: CPU class: Add interrupt handling support MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit This patch introduces functions avr_cpu_do_interrupt() and avr_cpu_exec_interrupt() that are part of AVR CPU class object. [AM: Split a larger AVR introduction patch into logical units] Suggested-by: Aleksandar Markovic Co-developed-by: Michael Rolnik Co-developed-by: Sarah Harris Signed-off-by: Michael Rolnik Signed-off-by: Sarah Harris Signed-off-by: Richard Henderson Signed-off-by: Aleksandar Markovic Acked-by: Igor Mammedov Tested-by: Philippe Mathieu-Daudé Signed-off-by: Thomas Huth Message-Id: <20200705140315.260514-4-huth@tuxfamily.org> Signed-off-by: Philippe Mathieu-Daudé --- target/avr/cpu.c | 2 ++ target/avr/helper.c | 89 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 91 insertions(+) create mode 100644 target/avr/helper.c (limited to 'target/avr') diff --git a/target/avr/cpu.c b/target/avr/cpu.c index 6b045f1967..854e7ee1ff 100644 --- a/target/avr/cpu.c +++ b/target/avr/cpu.c @@ -199,6 +199,8 @@ static void avr_cpu_class_init(ObjectClass *oc, void *data) cc->class_by_name = avr_cpu_class_by_name; cc->has_work = avr_cpu_has_work; + cc->do_interrupt = avr_cpu_do_interrupt; + cc->cpu_exec_interrupt = avr_cpu_exec_interrupt; cc->dump_state = avr_cpu_dump_state; cc->set_pc = avr_cpu_set_pc; cc->disas_set_info = avr_cpu_disas_set_info; diff --git a/target/avr/helper.c b/target/avr/helper.c new file mode 100644 index 0000000000..7174e4858e --- /dev/null +++ b/target/avr/helper.c @@ -0,0 +1,89 @@ +/* + * QEMU AVR CPU helpers + * + * Copyright (c) 2016-2020 Michael Rolnik + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, see + * + */ + +#include "qemu/osdep.h" +#include "cpu.h" +#include "exec/exec-all.h" +#include "exec/helper-proto.h" + +bool avr_cpu_exec_interrupt(CPUState *cs, int interrupt_request) +{ + bool ret = false; + CPUClass *cc = CPU_GET_CLASS(cs); + AVRCPU *cpu = AVR_CPU(cs); + CPUAVRState *env = &cpu->env; + + if (interrupt_request & CPU_INTERRUPT_RESET) { + if (cpu_interrupts_enabled(env)) { + cs->exception_index = EXCP_RESET; + cc->do_interrupt(cs); + + cs->interrupt_request &= ~CPU_INTERRUPT_RESET; + + ret = true; + } + } + if (interrupt_request & CPU_INTERRUPT_HARD) { + if (cpu_interrupts_enabled(env) && env->intsrc != 0) { + int index = ctz32(env->intsrc); + cs->exception_index = EXCP_INT(index); + cc->do_interrupt(cs); + + env->intsrc &= env->intsrc - 1; /* clear the interrupt */ + cs->interrupt_request &= ~CPU_INTERRUPT_HARD; + + ret = true; + } + } + return ret; +} + +void avr_cpu_do_interrupt(CPUState *cs) +{ + AVRCPU *cpu = AVR_CPU(cs); + CPUAVRState *env = &cpu->env; + + uint32_t ret = env->pc_w; + int vector = 0; + int size = avr_feature(env, AVR_FEATURE_JMP_CALL) ? 2 : 1; + int base = 0; + + if (cs->exception_index == EXCP_RESET) { + vector = 0; + } else if (env->intsrc != 0) { + vector = ctz32(env->intsrc) + 1; + } + + if (avr_feature(env, AVR_FEATURE_3_BYTE_PC)) { + cpu_stb_data(env, env->sp--, (ret & 0x0000ff)); + cpu_stb_data(env, env->sp--, (ret & 0x00ff00) >> 8); + cpu_stb_data(env, env->sp--, (ret & 0xff0000) >> 16); + } else if (avr_feature(env, AVR_FEATURE_2_BYTE_PC)) { + cpu_stb_data(env, env->sp--, (ret & 0x0000ff)); + cpu_stb_data(env, env->sp--, (ret & 0x00ff00) >> 8); + } else { + cpu_stb_data(env, env->sp--, (ret & 0x0000ff)); + } + + env->pc_w = base + vector * size; + env->sregI = 0; /* clear Global Interrupt Flag */ + + cs->exception_index = -1; +} -- cgit v1.2.3