Introduce concept of Process Resources (PR_MEM), implement necessary syscalls

kernel/proc/proc.h

@@ -6,6 +6,7 @@
 #include <libk/list.h>
 #include <libk/rbtree.h>
 #include <libk/std.h>
+#include <proc/resource.h>
 #include <sync/spin_lock.h>
 #include <sys/mm.h>
 
@@ -19,6 +20,8 @@
 /// Process marked garbage collection
 #define PROC_DEAD 1
 
+#define PROC_RESOURCES_MAX 1024
+
 struct cpu;
 
 struct proc_mapping {
@@ -40,6 +43,8 @@ struct proc {
   spin_lock_t lock;
   struct cpu* cpu;
   atomic_int state;
+  struct rb_node_link* resource_tree;
+  atomic_int rids;
 };
 
 void proc_sched (void);