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

kernel/proc/resource.h

@@ -0,0 +1,44 @@
+#ifndef _KERNEL_PROC_RESOURCE_H
+#define _KERNEL_PROC_RESOURCE_H
+
+#include <libk/rbtree.h>
+#include <libk/std.h>
+#include <sync/spin_lock.h>
+
+#define PR_MEM 0
+
+#define RV_PRIVATE 0
+#define RV_PUBLIC  1
+
+struct proc;
+
+struct proc_resource_mem {
+  uintptr_t paddr;
+  size_t pages;
+};
+
+struct proc_resource_mem_init {
+  size_t pages;
+};
+
+struct proc_resource {
+  int type;
+  int rid;
+  int visibility;
+  spin_lock_t lock;
+  atomic_int refs;
+  struct rb_node_link proc_resource_tree_link;
+  union {
+    struct proc_resource_mem mem;
+  } u;
+  struct {
+    void (*cleanup) (struct proc_resource* resource);
+  } ops;
+};
+
+struct proc_resource* proc_create_resource (struct proc* proc, int rid, int type, int vis,
+                                            void* data);
+void proc_drop_resource (struct proc* proc, struct proc_resource* resource);
+void proc_cleanup_resources (struct proc* proc);
+
+#endif // _KERNEL_PROC_RESOURCE_H