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-rw-r--r--exec.c3
-rw-r--r--include/exec/ioport.h4
-rw-r--r--ioport.c16
3 files changed, 22 insertions, 1 deletions
diff --git a/exec.c b/exec.c
index e6f04d82a1..3859b02d57 100644
--- a/exec.c
+++ b/exec.c
@@ -1805,7 +1805,8 @@ static void memory_map_init(void)
address_space_init(&address_space_memory, system_memory, "memory");
system_io = g_malloc(sizeof(*system_io));
- memory_region_init(system_io, NULL, "io", 65536);
+ memory_region_init_io(system_io, NULL, &unassigned_io_ops, NULL, "io",
+ 65536);
address_space_init(&address_space_io, system_io, "I/O");
memory_listener_register(&core_memory_listener, &address_space_memory);
diff --git a/include/exec/ioport.h b/include/exec/ioport.h
index bdd4e964eb..b3848be684 100644
--- a/include/exec/ioport.h
+++ b/include/exec/ioport.h
@@ -45,6 +45,10 @@ typedef struct MemoryRegionPortio {
#define PORTIO_END_OF_LIST() { }
+#ifndef CONFIG_USER_ONLY
+extern const MemoryRegionOps unassigned_io_ops;
+#endif
+
void cpu_outb(pio_addr_t addr, uint8_t val);
void cpu_outw(pio_addr_t addr, uint16_t val);
void cpu_outl(pio_addr_t addr, uint32_t val);
diff --git a/ioport.c b/ioport.c
index 79b7f1ae38..707cce88ab 100644
--- a/ioport.c
+++ b/ioport.c
@@ -44,6 +44,22 @@ typedef struct MemoryRegionPortioList {
MemoryRegionPortio ports[];
} MemoryRegionPortioList;
+static uint64_t unassigned_io_read(void *opaque, hwaddr addr, unsigned size)
+{
+ return -1ULL;
+}
+
+static void unassigned_io_write(void *opaque, hwaddr addr, uint64_t val,
+ unsigned size)
+{
+}
+
+const MemoryRegionOps unassigned_io_ops = {
+ .read = unassigned_io_read,
+ .write = unassigned_io_write,
+ .endianness = DEVICE_NATIVE_ENDIAN,
+};
+
void cpu_outb(pio_addr_t addr, uint8_t val)
{
LOG_IOPORT("outb: %04"FMT_pioaddr" %02"PRIx8"\n", addr, val);