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Diffstat (limited to 'results/classifier/105/device/1618')
| -rw-r--r-- | results/classifier/105/device/1618 | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/results/classifier/105/device/1618 b/results/classifier/105/device/1618 new file mode 100644 index 00000000..4220884f --- /dev/null +++ b/results/classifier/105/device/1618 @@ -0,0 +1,26 @@ +device: 0.856 +instruction: 0.838 +graphic: 0.799 +network: 0.740 +mistranslation: 0.716 +semantic: 0.601 +socket: 0.553 +boot: 0.446 +vnc: 0.428 +KVM: 0.310 +other: 0.308 +assembly: 0.269 + +intel-hda: SD_STS different behavior for byte write vs. word write +Description of problem: +The Intel HDA SD_STS register is accessible two different ways in QEMU: either it's the top 8 bits of a 32-bit access +or it's directly accessible as a byte. +On reads, the register behavior for SD_STS is identical whether accessed as a 32-bit read or an 8-bit read. +On writes, the behavior is different; when written to as an 8-bit write, the BCIS, FIFOE, and DESE bits implement the documented HDA behavior of RW1C (writing a 1 to a bit clears it). When written to as the top 8 bits of a 32-bit write, writing a 1 to a bit sets the bit -- so an attempt to clear a status bit instead unconditionally sets the status bit. +Steps to reproduce: +1. Write 32 bits at SD_CTL address with bit 27 set (FIFOE). This should clear FIFOE, but does not. +2. Read back SD_STS (SD_CTL address + 3) as a byte. The FIFOE bit will be set. +3. Write 8 bits at SD_STS address with bit 3 set (FIFOE). This should clear FIFOE, and it does. +4. Read back SD_STS as a byte. The FIFOE bit will be cleared. +Additional information: + |