[USER] brk syscall

kernel/syscall/sys_mem.c

@@ -0,0 +1,19 @@
+#include <syscall.h>
+#include <scheduler.h>
+#include <debug.h>
+
+
+SYSCALL_DEF(brk)
+{
+  SYSCALL_INIT(uint64_t, addr);
+  procmm_area_t *brk = get_current_process()->mmap->brk;
+
+  if(addr)
+  {
+    size_t len = addr - brk->start;
+    procmm_resize(get_current_process(), brk, len);
+    return brk->end;
+  } else {
+    return brk->end;
+  }
+}

kernel/syscall/syscall.c

@@ -57,6 +57,7 @@ void syscall_init()
 
     SYSCALL_REGISTER(debug, SYS_DEBUG);
     SYSCALL_REGISTER(write, SYS_WRITE);
+    SYSCALL_REGISTER(brk, SYS_BRK);
   }
 
 }