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Author SHA1 Message Date
Nicolas Pitre 7a55bda7e1 riscv: pmp: add new usermode support 
The idea here is to compute the PMP register set on demand i.e. upon
scheduling in the affected threads, and only if changes occurred.
A simple sequence number is used to stay in sync with the latest update.

Signed-off-by: Nicolas Pitre <npitre@baylibre.com>
 2022-04-29 15:30:00 +02:00
Nicolas Pitre 68b8f0e5ce riscv: pmp: new stackguard implementation 
Stackguard uses the PMP to prevents many types of stack overflow by
making any access to the bottom stack area raise a CPU exception. Each
thread has its set of precomputed PMP entries and those are written to
PMP registers at context switch time.

This is the code to set it up. It will be connected later.

Signed-off-by: Nicolas Pitre <npitre@baylibre.com>
 2022-04-29 15:30:00 +02:00
Nicolas Pitre 2e66da3bc3 riscv: pmp: new implementation 
This is the core code to manage PMP entries with only the global entries
initialisation for now. It is not yet linked into the build.

Signed-off-by: Nicolas Pitre <npitre@baylibre.com>
 2022-04-29 15:30:00 +02:00