diff options
| -rw-r--r-- | hw/misc/pc-testdev.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/hw/misc/pc-testdev.c b/hw/misc/pc-testdev.c index 699a16ffbe..6588ea23a5 100644 --- a/hw/misc/pc-testdev.c +++ b/hw/misc/pc-testdev.c @@ -80,13 +80,20 @@ static void test_ioport_write(void *opaque, hwaddr addr, uint64_t data, unsigned len) { PCTestdev *dev = opaque; - dev->ioport_data = data; + int bits = len * 8; + int start_bit = (addr & 3) * 8; + uint32_t mask = ((uint32_t)-1 >> (32 - bits)) << start_bit; + dev->ioport_data &= ~mask; + dev->ioport_data |= data << start_bit; } static uint64_t test_ioport_read(void *opaque, hwaddr addr, unsigned len) { PCTestdev *dev = opaque; - return dev->ioport_data; + int bits = len * 8; + int start_bit = (addr & 3) * 8; + uint32_t mask = ((uint32_t)-1 >> (32 - bits)) << start_bit; + return (dev->ioport_data & mask) >> start_bit; } static const MemoryRegionOps test_ioport_ops = { |