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grandcentral: respect size when reading from IOBus devices.

This commit is contained in:
Maxim Poliakovski 2023-12-10 00:05:58 +01:00
parent 078aa79270
commit 705dd390e9
1 changed files with 4 additions and 2 deletions
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6
devices/ioctrl/grandcentral.cpp
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@ -123,8 +123,10 @@ uint32_t GrandCentral::read(uint32_t rgn_start, uint32_t offset, int size)
case 0xC: // IOBus dev #3
case 0xE: // IOBus dev #5
if (this->iobus_devs[subdev_num - 10] != nullptr) {
return BYTESWAP_16(this->iobus_devs[subdev_num - 10]->iodev_read(
(offset >> 4) & 0x1F));
uint32_t result = this->iobus_devs[subdev_num - 10]->iodev_read(
(offset >> 4) & 0x1F);
result &= 0xFFFFFFFFUL >> (4 - size) * 8; // strip unused bits
return BYTESWAP_SIZED(result, size);
} else {
LOG_F(ERROR, "GC: IOBus device #%d doesn't exist", subdev_num - 9);
return 0;