target/riscv: Expose interrupt pending bits as GPIO lines

Expose the 12 interrupt pending bits in MIP as GPIO lines.

Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Bin Meng <bmeng.cn@gmail.com>
Message-id: 069d6162f0bc2f4a4f5a44e73f6442b11c703c53.1630301632.git.alistair.francis@wdc.com

diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c
index d4d5961..7c626d8 100644 (file)
--- a/target/riscv/cpu.c
+++ b/target/riscv/cpu.c
@@ -567,11 +567,41 @@ static void riscv_cpu_realize(DeviceState *dev, Error **errp)
     mcc->parent_realize(dev, errp);
 }
 
+#ifndef CONFIG_USER_ONLY
+static void riscv_cpu_set_irq(void *opaque, int irq, int level)
+{
+    RISCVCPU *cpu = RISCV_CPU(opaque);
+
+    switch (irq) {
+    case IRQ_U_SOFT:
+    case IRQ_S_SOFT:
+    case IRQ_VS_SOFT:
+    case IRQ_M_SOFT:
+    case IRQ_U_TIMER:
+    case IRQ_S_TIMER:
+    case IRQ_VS_TIMER:
+    case IRQ_M_TIMER:
+    case IRQ_U_EXT:
+    case IRQ_S_EXT:
+    case IRQ_VS_EXT:
+    case IRQ_M_EXT:
+        riscv_cpu_update_mip(cpu, 1 << irq, BOOL_TO_MASK(level));
+        break;
+    default:
+        g_assert_not_reached();
+    }
+}
+#endif /* CONFIG_USER_ONLY */
+
 static void riscv_cpu_init(Object *obj)
 {
     RISCVCPU *cpu = RISCV_CPU(obj);
 
     cpu_set_cpustate_pointers(cpu);
+
+#ifndef CONFIG_USER_ONLY
+    qdev_init_gpio_in(DEVICE(cpu), riscv_cpu_set_irq, 12);
+#endif /* CONFIG_USER_ONLY */
 }
 
 static Property riscv_cpu_properties[] = {