RISC-V Design · All levels
Privilege Levels, Execution Modes, and Delegation Boundaries: Design Space
Design Space for Privilege Levels, Execution Modes, and Delegation Boundaries.
Design space
Design Space for Privilege Levels, Execution Modes, and Delegation Boundaries is anchored on Privilege-transition latency and number of unauthorized accesses blocked by PMP/page-permission checks per billion instructions.. Convert observations into mechanism-backed decisions with explicit ownership.
Trade latency and throughput against power and area.
Prefer architecture options with clear software contract impact.
Quantify extension-profile cost before enabling by default.
Keep bring-up and validation ownership explicit.
Trend lens
diagram
BEFORE / AFTER TREND - Privilege Levels, Execution Modes, and Delegation Boundaries
Privilege-transition latency and number of unauthorized accesses blocked by PMP/page-permission checks per billion instructions.
^
| o target band
| o after fix + reruns
| o
| o baseline (failing)
+--------------------------------------------------> iteration
capture issue isolate mechanism close + monitor
Use this view to confirm the gain is causal and stable across seeds.