mirror of
https://github.com/RIOT-OS/RIOT.git
synced 2024-12-29 04:50:03 +01:00
755442fe27
19712: cpu/riscv: Add PMP driver r=MrKevinWeiss a=Teufelchen1
### Contribution description
Hi! 🐘
this adds a basic RISC-V physical memory protection (PMP) driver to RIOT. Well, 'driver' might be a stretched, feels more like a little utility :)
EDIT: Also added a no-execute RAM option for the hifive & a corresponding test
Since I only have an Hifive rev b, it's only enabled on this board / cpu. I also tested the code on an ESP32-C but the feature can't be enabled there, as `cpu/riscv_common/` is not used by the ESP32...
### Testing procedure
* Grab a hifive rev b
* go to `examples/hello-world`
* Add `USEMODULES += periph_pmp` to the `Makefile`
* Include `pmp.h` in `main.c`
* Add code e.g. `print_pmpcfg(0);`
* compile & flash & term
You should see something like this:
```
# Hello World!
# You are running RIOT on a(n) hifive1b board.
# This board features a(n) fe310 MCU.
# pmp00cfg: - R-X OFF 0x00000000 - 0x00000000
```
Co-authored-by: Teufelchen1 <bennet.blischke@outlook.com>
|
||
|---|---|---|
| .. | ||
| Kconfig.consts | ||
| Kconfig.errors | ||
| Kconfig.features | ||
| Kconfig.ztimer_only | ||