1 files changed, 76 insertions, 0 deletions
diff --git a/src/hw/misc/debugexit.c b/src/hw/misc/debugexit.c
new file mode 100644
index 0000000..69a1b00
--- /dev/null
+++ b/src/hw/misc/debugexit.c
@@ -0,0 +1,76 @@
+/*
+ * debug exit port emulation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 or
+ * (at your option) any later version.
+ */
+
+#include "hw/hw.h"
+#include "hw/isa/isa.h"
+
+#define TYPE_ISA_DEBUG_EXIT_DEVICE "isa-debug-exit"
+#define ISA_DEBUG_EXIT_DEVICE(obj) \
+     OBJECT_CHECK(ISADebugExitState, (obj), TYPE_ISA_DEBUG_EXIT_DEVICE)
+
+typedef struct ISADebugExitState {
+    ISADevice parent_obj;
+
+    uint32_t iobase;
+    uint32_t iosize;
+    MemoryRegion io;
+} ISADebugExitState;
+
+static void debug_exit_write(void *opaque, hwaddr addr, uint64_t val,
+                             unsigned width)
+{
+    exit((val << 1) | 1);
+}
+
+static const MemoryRegionOps debug_exit_ops = {
+    .write = debug_exit_write,
+    .valid.min_access_size = 1,
+    .valid.max_access_size = 4,
+    .endianness = DEVICE_LITTLE_ENDIAN,
+};
+
+static void debug_exit_realizefn(DeviceState *d, Error **errp)
+{
+    ISADevice *dev = ISA_DEVICE(d);
+    ISADebugExitState *isa = ISA_DEBUG_EXIT_DEVICE(d);
+
+    memory_region_init_io(&isa->io, OBJECT(dev), &debug_exit_ops, isa,
+                          TYPE_ISA_DEBUG_EXIT_DEVICE, isa->iosize);
+    memory_region_add_subregion(isa_address_space_io(dev),
+                                isa->iobase, &isa->io);
+}
+
+static Property debug_exit_properties[] = {
+    DEFINE_PROP_UINT32("iobase", ISADebugExitState, iobase, 0x501),
+    DEFINE_PROP_UINT32("iosize", ISADebugExitState, iosize, 0x02),
+    DEFINE_PROP_END_OF_LIST(),
+};
+
+static void debug_exit_class_initfn(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+
+    dc->realize = debug_exit_realizefn;
+    dc->props = debug_exit_properties;
+    set_bit(DEVICE_CATEGORY_MISC, dc->categories);
+}
+
+static const TypeInfo debug_exit_info = {
+    .name          = TYPE_ISA_DEBUG_EXIT_DEVICE,
+    .parent        = TYPE_ISA_DEVICE,
+    .instance_size = sizeof(ISADebugExitState),
+    .class_init    = debug_exit_class_initfn,
+};
+
+static void debug_exit_register_types(void)
+{
+    type_register_static(&debug_exit_info);
+}
+
+type_init(debug_exit_register_types)