[Qemu-devel] [PATCH v3 09/16] target-or32: Add PIC support

[Jia Liu]

Add OpenRISC Programmable Interrupt Controller.

Signed-off-by: Jia Liu <address@hidden>
---
 hw/openrisc_pic.c     |   50 +++++++++++++++++++++++++++++++++++++++++++++++++
 target-openrisc/cpu.h |    2 ++
 2 files changed, 52 insertions(+)

diff --git a/hw/openrisc_pic.c b/hw/openrisc_pic.c
index 1c20790..76bd792 100644
--- a/hw/openrisc_pic.c
+++ b/hw/openrisc_pic.c
@@ -25,4 +25,54 @@
 /* Reset PIC */
 void cpu_openrisc_pic_reset(CPUOpenRISCState *env)
 {
+    env->picmr = 0x00000000;
+    env->picsr = 0x00000000;
+}
+
+/* OpenRISC pic handler */
+static void openrisc_pic_cpu_handler(void *opaque, int irq, int level)
+{
+    CPUOpenRISCState *env = (CPUOpenRISCState *)opaque;
+    int i;
+    uint32_t irq_bit = 1 << irq;
+
+    if (irq > 31 || irq < 0) {
+        return;
+    }
+
+    if (level) {
+        env->picsr |= irq_bit;
+    } else {
+        env->picsr &= ~irq_bit;
+    }
+
+    for (i = 0; i < 32; i++) {
+        if ((env->picsr && (1 << i)) && (env->picmr && (1 << i))) {
+            cpu_interrupt(env, CPU_INTERRUPT_HARD);
+        } else {
+            cpu_reset_interrupt(env, CPU_INTERRUPT_HARD);
+            env->picsr &= ~(1 << i);
+        }
+    }
+}
+
+void cpu_openrisc_pic_init(CPUOpenRISCState *env)
+{
+    int i;
+    qemu_irq *qi;
+    qi = qemu_allocate_irqs(openrisc_pic_cpu_handler, env, NR_IRQS);
+
+    for (i = 0; i < NR_IRQS; i++) {
+        env->irq[i] = qi[i];
+    }
+}
+
+void cpu_openrisc_store_picmr(CPUOpenRISCState *env, uint32_t value)
+{
+    env->picmr |= value;
+}
+
+void cpu_openrisc_store_picsr(CPUOpenRISCState *env, uint32_t value)
+{
+    env->picsr &= ~value;
 }
diff --git a/target-openrisc/cpu.h b/target-openrisc/cpu.h
index 568eb74..27f705b 100644
--- a/target-openrisc/cpu.h
+++ b/target-openrisc/cpu.h
@@ -328,6 +328,8 @@ int cpu_openrisc_handle_mmu_fault(CPUOpenRISCState *env, 
target_ulong address,
 
 #if !defined(CONFIG_USER_ONLY)
 void cpu_openrisc_pic_reset(CPUOpenRISCState *env);
+void cpu_openrisc_store_picsr(CPUOpenRISCState *env, uint32_t value);
+void cpu_openrisc_store_picmr(CPUOpenRISCState *env, uint32_t value);
 
 void cpu_openrisc_timer_reset(CPUOpenRISCState *env);
 
-- 
1.7.9.5