diff --git a/10_day/bootpack.h b/10_day/bootpack.h
index 0e46fc2..3e572bb 100644
--- a/10_day/bootpack.h
+++ b/10_day/bootpack.h
@@ -133,4 +133,6 @@ unsigned int memtest(unsigned int start, unsigned int end);
 void memman_init(struct MEMMAN *man);
 unsigned int memman_total(struct MEMMAN *man);
 unsigned int memman_alloc(struct MEMMAN *man, unsigned int size);
+unsigned int memman_alloc_4k(struct MEMMAN *man, unsigned int size);
 int memman_free(struct MEMMAN *man, unsigned int addr, unsigned int size);
+int memman_free_4k(struct MEMMAN *man, unsigned int addr, unsigned int size);
diff --git a/10_day/memory.c b/10_day/memory.c
index c9f8cd8..654e816 100644
--- a/10_day/memory.c
+++ b/10_day/memory.c
@@ -143,3 +143,19 @@ int memman_free(struct MEMMAN *man, unsigned int addr, unsigned int size)
 	man->lostsize += size;
 	return -1; /* 失败 */
 }
+
+unsigned int memman_alloc_4k(struct MEMMAN *man, unsigned int size)
+{
+	unsigned int a;
+	size = (size + 0xfff) & 0xfffff000;
+	a = memman_alloc(man, size);
+	return a;
+}
+
+int memman_free_4k(struct MEMMAN *man, unsigned int addr, unsigned int size)
+{
+	int i;
+	size = (size + 0xfff) & 0xfffff000;
+	i = memman_free(man, addr, size);
+	return i;
+}