From 3f2546b2ef55b661fd8dd69682b38992225e86f6 Mon Sep 17 00:00:00 2001
From: fishsoupisgood <github@madingley.org>
Date: Mon, 29 Apr 2019 01:17:54 +0100
Subject: Initial import of qemu-2.4.1

---
 hw/mips/mips_int.c | 78 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 78 insertions(+)
 create mode 100644 hw/mips/mips_int.c

(limited to 'hw/mips/mips_int.c')

diff --git a/hw/mips/mips_int.c b/hw/mips/mips_int.c
new file mode 100644
index 00000000..d740046b
--- /dev/null
+++ b/hw/mips/mips_int.c
@@ -0,0 +1,78 @@
+/*
+ * QEMU MIPS interrupt support
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "hw/hw.h"
+#include "hw/mips/cpudevs.h"
+#include "cpu.h"
+#include "sysemu/kvm.h"
+#include "kvm_mips.h"
+
+static void cpu_mips_irq_request(void *opaque, int irq, int level)
+{
+    MIPSCPU *cpu = opaque;
+    CPUMIPSState *env = &cpu->env;
+    CPUState *cs = CPU(cpu);
+
+    if (irq < 0 || irq > 7)
+        return;
+
+    if (level) {
+        env->CP0_Cause |= 1 << (irq + CP0Ca_IP);
+
+        if (kvm_enabled() && irq == 2) {
+            kvm_mips_set_interrupt(cpu, irq, level);
+        }
+
+    } else {
+        env->CP0_Cause &= ~(1 << (irq + CP0Ca_IP));
+
+        if (kvm_enabled() && irq == 2) {
+            kvm_mips_set_interrupt(cpu, irq, level);
+        }
+    }
+
+    if (env->CP0_Cause & CP0Ca_IP_mask) {
+        cpu_interrupt(cs, CPU_INTERRUPT_HARD);
+    } else {
+        cpu_reset_interrupt(cs, CPU_INTERRUPT_HARD);
+    }
+}
+
+void cpu_mips_irq_init_cpu(CPUMIPSState *env)
+{
+    qemu_irq *qi;
+    int i;
+
+    qi = qemu_allocate_irqs(cpu_mips_irq_request, mips_env_get_cpu(env), 8);
+    for (i = 0; i < 8; i++) {
+        env->irq[i] = qi[i];
+    }
+}
+
+void cpu_mips_soft_irq(CPUMIPSState *env, int irq, int level)
+{
+    if (irq < 0 || irq > 2) {
+        return;
+    }
+
+    qemu_set_irq(env->irq[irq], level);
+}
-- 
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