a few new syscalls, init process

code/kernel/ke_process.c

@@ -174,3 +174,20 @@ OBJECT* KeLookupHandle(PROCESS* process, uint32_t handle) {
     KeReleaseSpinlock(&process->HandleLock, flags);
     return obj;
 }
+
+PROCESS* KeGetProcessById(uint32_t pid) {
+    uintptr_t flags = KeAcquireSpinlock(&gProcessListLock);
+    LIST_ENTRY* head = &gProcessList;
+    LIST_ENTRY* node = head->Fwd;
+    while (node != head) {
+        PROCESS* p = CONTAINING_RECORD(node, PROCESS, GlobalLink);
+        if (p->ProcessId == pid) {
+            ObReferenceObject(&p->Header);
+            KeReleaseSpinlock(&gProcessListLock, flags);
+            return p;
+        }
+        node = node->Fwd;
+    }
+    KeReleaseSpinlock(&gProcessListLock, flags);
+    return (PROCESS*)0;
+}