diff options
Diffstat (limited to 'results/classifier/118/device/2796')
| -rw-r--r-- | results/classifier/118/device/2796 | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/results/classifier/118/device/2796 b/results/classifier/118/device/2796 new file mode 100644 index 000000000..b0f1ed7dc --- /dev/null +++ b/results/classifier/118/device/2796 @@ -0,0 +1,37 @@ +device: 0.832 +register: 0.732 +graphic: 0.731 +mistranslation: 0.661 +architecture: 0.568 +performance: 0.485 +semantic: 0.482 +risc-v: 0.454 +kernel: 0.412 +ppc: 0.408 +vnc: 0.357 +arm: 0.312 +PID: 0.285 +permissions: 0.282 +debug: 0.269 +TCG: 0.258 +socket: 0.257 +boot: 0.242 +VMM: 0.204 +user-level: 0.190 +files: 0.183 +network: 0.145 +peripherals: 0.145 +i386: 0.123 +x86: 0.067 +KVM: 0.013 +assembly: 0.012 +hypervisor: 0.006 +virtual: 0.006 + +Opentitan Timer ignores COMPARE_UPPER0/COMPARE_LOWER0 +Description of problem: +In a bare metal application, running on an emulated Opentitan board, if you set a timer interrupt threshold by writing to `rv_timer.COMPARE_UPPER0` and `rv_timer.COMPARE_LOWER0` before writing to `rv_timer.CTRL` to start the timer, then the interrupt does not fire. If you write to the `COMPARE_*` registers *after* starting the timer by writing to `CTRL`, then the interrupt fires correctly. + +I think the explanation is that [ibex_timer_update_irqs](https://gitlab.com/qemu-project/qemu/-/blob/master/hw/timer/ibex_timer.c?ref_type=heads#L61) has an early return if `rv_timer.CTRL` is not set. As a result, although writes to `COMPARE_*` always call `ibex_timer_update_irqs`, they don't have their intended side-effects before `CTRL` is unset. +Steps to reproduce: +Write to `rv_timer.COMPARE_UPPER0` and `rv_timer.COMPARE_LOWER0` before you have set `rv_timer.CTRL`. Observe that no timer interrupt occurs. |