feat(kernel): per-process budgets (pages, endpoints, notifs, regions) carved from creator, returned on death; init owns pool

crates/libkos/src/syscall/process.rs

@@ -3,6 +3,7 @@
 use super::{call0, raw, slot_of};
 use types::address::{EntryPoint, StackPointer};
 use types::bounded::CapSlot;
+use types::budget::Limits;
 use types::id::ProcessId;
 use types::syscall_abi::*;
 use types::time::Ticks;
@@ -38,10 +39,18 @@ pub fn get_process_id() -> ProcessId {
     ProcessId::from_raw(call0(SYS_GET_PROCESS_ID).map_or(0, |r| r[1]) as u16)
 }
 
-pub fn create_process(create_cap: CapSlot) -> Option<CapSlot> {
+/// The new process's `limits` come out of this process's own budget.
+pub fn create_process(create_cap: CapSlot, limits: Limits) -> Option<CapSlot> {
     slot_of(raw(
         SYS_CREATE_PROCESS,
-        [create_cap.value() as usize, 0, 0, 0, 0, 0],
+        [
+            create_cap.value() as usize,
+            limits.pages,
+            limits.endpoints,
+            limits.notifications,
+            limits.regions,
+            0,
+        ],
     ))
     .ok()
 }