Implement kernel brk

src/kernel/memory/kbrk.c

@@ -0,0 +1,18 @@
+#include <memory.h>
+#include <debug.h>
+
+static long _brk = KERNEL_BRK0;
+
+long kbrk(long brk, long, long, long, long, long)
+{
+    if(brk)
+    {
+        while(_brk < brk) {
+            vmm_set_page(kernel_P4, _brk, pmm_alloc(), PAGE_WRITE | PAGE_PRESENT);
+            _brk += PAGE_SIZE;
+        }
+        return _brk;
+    } else {
+        return _brk;
+    }
+}

src/kernel/memory/memory.c

@@ -2,6 +2,7 @@
 #include <memory.h>
 #include <debug.h>
 #include <multiboot.h>
+#include <musl-glue.h>
 
 
 uint64_t kernel_P4;
@@ -37,4 +38,6 @@ void memory_init()
             pmm_free(p);
         }
     }
+
+    set_syscall_handler(SYSCALL_BRK, &kbrk);
 }