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[Qemu-devel] [PATCH 5/9] target-avr: adding AVR interrupt handling
From: |
Michael Rolnik |
Subject: |
[Qemu-devel] [PATCH 5/9] target-avr: adding AVR interrupt handling |
Date: |
Fri, 3 Jun 2016 03:40:16 +0300 |
Signed-off-by: Michael Rolnik <address@hidden>
---
target-avr/helper.c | 64 ++++++++++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 63 insertions(+), 1 deletion(-)
diff --git a/target-avr/helper.c b/target-avr/helper.c
index fbab91d..bb47a87 100644
--- a/target-avr/helper.c
+++ b/target-avr/helper.c
@@ -31,11 +31,73 @@
bool avr_cpu_exec_interrupt(CPUState *cs, int interrupt_request)
{
- return false;
+ CPUClass *cc = CPU_GET_CLASS(cs);
+ AVRCPU *cpu = AVR_CPU(cs);
+ CPUAVRState *env = &cpu->env;
+
+ bool ret = false;
+
+ 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 = __builtin_ffs(env->intsrc) - 1;
+ 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;
+ int vector;
+ int size = avr_feature(env, AVR_FEATURE_JMP_CALL) ? 2 : 1;
+ int base = 0; /* TODO: where to get it */
+
+ if (cs->exception_index == EXCP_RESET) {
+ vector = 0;
+ } else if (env->intsrc != 0) {
+ vector = __builtin_ffs(env->intsrc);
+ }
+
+ if (avr_feature(env, AVR_FEATURE_3_BYTE_PC)) {
+ stb_phys(cs->as, env->sp--, (ret & 0x0000ff));
+ stb_phys(cs->as, env->sp--, (ret & 0x00ff00) >> 8);
+ stb_phys(cs->as, env->sp--, (ret & 0xff0000) >> 16);
+
+ env->pc = base + vector * size;
+ } else if (avr_feature(env, AVR_FEATURE_2_BYTE_PC)) {
+ stb_phys(cs->as, env->sp--, (ret & 0x0000ff));
+ stb_phys(cs->as, env->sp--, (ret & 0x00ff00) >> 8);
+
+ env->pc = base + vector * size;
+ } else {
+ stb_phys(cs->as, env->sp--, (ret & 0x0000ff));
+
+ env->pc = base + vector * size;
+ }
+
+ env->sregI = 0; /* clear Global Interrupt Flag */
+
+ cs->exception_index = -1;
}
int avr_cpu_memory_rw_debug(CPUState *cs, vaddr addr, uint8_t *buf, int len,
bool is_write)
--
2.4.9 (Apple Git-60)
- [Qemu-devel] AVR cores, Michael Rolnik, 2016/06/02
- [Qemu-devel] [PATCH 3/9] target-avr: adding a sample AVR board, Michael Rolnik, 2016/06/02
- [Qemu-devel] [PATCH 1/9] target-avr: AVR cores support is added. 1. basic CPU structure 2. registers 3. no instructions, Michael Rolnik, 2016/06/02
- [Qemu-devel] [PATCH 2/9] target-avr: adding AVR CPU features/flavors, Michael Rolnik, 2016/06/02
- [Qemu-devel] [PATCH 7/9] target-avr: adding instruction decoder, Michael Rolnik, 2016/06/02
- [Qemu-devel] [PATCH 6/9] target-avr: adding helpers for IN, OUT, SLEEP, WBR & unsupported instructions, Michael Rolnik, 2016/06/02
- [Qemu-devel] [PATCH 5/9] target-avr: adding AVR interrupt handling,
Michael Rolnik <=
- [Qemu-devel] [PATCH 4/9] target-avr: adding instructions encodings, Michael Rolnik, 2016/06/02
- [Qemu-devel] [PATCH 9/9] target-avr: updating translate.c to use instructions translation, Michael Rolnik, 2016/06/02
- [Qemu-devel] [PATCH 8/9] target-avr: adding instruction translation, Michael Rolnik, 2016/06/02