Stupidly simple process memory manager with brk()

src/kernel/include/process.h

@@ -3,15 +3,18 @@
 #include <scheduler.h>
 #include <stdint.h>
 #include <interrupts.h>
+#include <stddef.h>
 
 struct process
 {
   uint64_t pid;
   void *stack_ptr;
   uint64_t state;
+
   uint64_t P4;
+  uint64_t brk;
+  uint64_t stack;
   QUEUE_SPOT(runQ);
-  uint8_t stack[];
 };
 
 struct process *process();
@@ -21,3 +24,5 @@ void yield();
 void start_scheduler();
 
 void switch_stack(void *old_ptr, void *new_ptr);
+
+uint64_t procmm_brk(struct process *p, void *addr);