diff --git a/lab2/kernel/mm/mm.c b/lab2/kernel/mm/mm.c
index 95c99d5..e9a27c2 100644
--- a/lab2/kernel/mm/mm.c
+++ b/lab2/kernel/mm/mm.c
@@ -78,8 +78,8 @@ void map_kernel_space(vaddr_t va, paddr_t pa, size_t len)
     // 设置页表
     u32 start_entry_idx = GET_L2_INDEX(va);
     u32 end_entry_idx = GET_L2_INDEX((va + len));
-    for (u32 idx = start_entry_idx; idx < end_entry_idx; ++idx) {
-        table_l2[idx] = (pa + idx * SIZE_2M) | UXN | ACCESSED | INNER_SHARABLE | NORMAL_MEMORY | IS_VALID;
+    for (u32 idx = start_entry_idx, cnt = 0; idx < end_entry_idx; ++idx) {
+        table_l2[idx] = (pa + cnt++ * SIZE_2M) | UXN | ACCESSED | INNER_SHARABLE | NORMAL_MEMORY | IS_VALID;
     }
 
 	// </lab2>
diff --git a/lab3/kernel/mm/mm.c b/lab3/kernel/mm/mm.c
index 4159a15..1d2ba17 100644
--- a/lab3/kernel/mm/mm.c
+++ b/lab3/kernel/mm/mm.c
@@ -78,8 +78,8 @@ void map_kernel_space(vaddr_t va, paddr_t pa, size_t len)
     // 设置页表
     u32 start_entry_idx = GET_L2_INDEX(va);
     u32 end_entry_idx = GET_L2_INDEX((va + len));
-    for (u32 idx = start_entry_idx; idx < end_entry_idx; ++idx) {
-        table_l2[idx] = (pa + idx * SIZE_2M) | UXN | ACCESSED | INNER_SHARABLE | NORMAL_MEMORY | IS_VALID;
+    for (u32 idx = start_entry_idx, cnt = 0; idx < end_entry_idx; ++idx) {
+        table_l2[idx] = (pa + cnt++ * SIZE_2M) | UXN | ACCESSED | INNER_SHARABLE | NORMAL_MEMORY | IS_VALID;
     }
 
 	// </lab2>
diff --git a/lab4/kernel/mm/mm.c b/lab4/kernel/mm/mm.c
index 4159a15..1d2ba17 100644
--- a/lab4/kernel/mm/mm.c
+++ b/lab4/kernel/mm/mm.c
@@ -78,8 +78,8 @@ void map_kernel_space(vaddr_t va, paddr_t pa, size_t len)
     // 设置页表
     u32 start_entry_idx = GET_L2_INDEX(va);
     u32 end_entry_idx = GET_L2_INDEX((va + len));
-    for (u32 idx = start_entry_idx; idx < end_entry_idx; ++idx) {
-        table_l2[idx] = (pa + idx * SIZE_2M) | UXN | ACCESSED | INNER_SHARABLE | NORMAL_MEMORY | IS_VALID;
+    for (u32 idx = start_entry_idx, cnt = 0; idx < end_entry_idx; ++idx) {
+        table_l2[idx] = (pa + cnt++ * SIZE_2M) | UXN | ACCESSED | INNER_SHARABLE | NORMAL_MEMORY | IS_VALID;
     }
 
 	// </lab2>
diff --git a/lab5/kernel/mm/mm.c b/lab5/kernel/mm/mm.c
index 4159a15..1d2ba17 100644
--- a/lab5/kernel/mm/mm.c
+++ b/lab5/kernel/mm/mm.c
@@ -78,8 +78,8 @@ void map_kernel_space(vaddr_t va, paddr_t pa, size_t len)
     // 设置页表
     u32 start_entry_idx = GET_L2_INDEX(va);
     u32 end_entry_idx = GET_L2_INDEX((va + len));
-    for (u32 idx = start_entry_idx; idx < end_entry_idx; ++idx) {
-        table_l2[idx] = (pa + idx * SIZE_2M) | UXN | ACCESSED | INNER_SHARABLE | NORMAL_MEMORY | IS_VALID;
+    for (u32 idx = start_entry_idx, cnt = 0; idx < end_entry_idx; ++idx) {
+        table_l2[idx] = (pa + cnt++ * SIZE_2M) | UXN | ACCESSED | INNER_SHARABLE | NORMAL_MEMORY | IS_VALID;
     }
 
 	// </lab2>