diff --git a/build/grub/scripts/build-grub-image.sh b/build/grub/scripts/build-grub-image.sh
index 754c16844..1d1770984 100755
--- a/build/grub/scripts/build-grub-image.sh
+++ b/build/grub/scripts/build-grub-image.sh
@@ -5,7 +5,7 @@ set -eux
 KERNEL=$1
 
 # Copy the needed files into an ISO image.
-mkdir -p target/iso_root
+mkdir -p target/iso_root/boot
 cp $KERNEL target/iso_root/boot/jinux
 mkdir -p target/iso_root/boot/grub
 cp build/grub/conf/grub.cfg target/iso_root/boot/grub
diff --git a/framework/jinux-frame/src/arch/x86/boot/multiboot2/boot.S b/framework/jinux-frame/src/arch/x86/boot/multiboot2/boot.S
index 2977bb4ee..7a5676c8d 100644
--- a/framework/jinux-frame/src/arch/x86/boot/multiboot2/boot.S
+++ b/framework/jinux-frame/src/arch/x86/boot/multiboot2/boot.S
@@ -152,16 +152,28 @@ PTE_GLOBAL      = (1 << 8)
 
     // Page Directory: map to low 1 GiB * 4 space
     lea edi, [boot_pd]
-    mov eax, PTE_PRESENT | PTE_WRITE | PTE_HUGE | PTE_GLOBAL
+    lea eax, [boot_pt + (PTE_PRESENT | PTE_WRITE | PTE_GLOBAL)]
     mov ecx, 512 * 4 // (of entries in PD) * (number of PD)
 
 write_pd_entry:
     mov dword ptr [edi], eax
     mov dword ptr [edi + 4], 0
-    add eax, 0x200000 // 2 MiB
+    add eax, 0x1000 // 4kiB
     add edi, 8
     loop write_pd_entry
 
+    // Page Table: map to low 4 KiB * 1M space
+    lea edi, [boot_pt]
+    mov eax, 0x103 // Present, writable, global.
+    mov ecx, 512 * 512 * 4 // (of entries in PT) * (number of PT)
+
+write_pt_entry:
+    mov dword ptr [edi], eax
+    mov dword ptr [edi + 4], 0
+    add eax, 0x1000 // 4KiB
+    add edi, 8
+    loop write_pt_entry
+
     jmp enable_long_mode
 
 enable_long_mode:
@@ -226,6 +238,8 @@ boot_pd_2g_3g:
     .skip 4096
 boot_pd_3g_4g:
     .skip 4096
+boot_pt:
+    .skip 4096 * 512 * 4
 boot_page_table_end:
 
 boot_stack_bottom:
diff --git a/framework/jinux-frame/src/lib.rs b/framework/jinux-frame/src/lib.rs
index 5d5c0e642..2ce684b64 100644
--- a/framework/jinux-frame/src/lib.rs
+++ b/framework/jinux-frame/src/lib.rs
@@ -23,7 +23,6 @@ pub mod bus;
 pub mod config;
 pub mod cpu;
 mod error;
-mod heap_allocator;
 pub mod logger;
 pub mod io_mem;
 pub mod prelude;
@@ -46,7 +45,7 @@ use trapframe::TrapFrame;
 static mut IRQ_CALLBACK_LIST: Vec<IrqCallbackHandle> = Vec::new();
 
 pub fn init() {
-    heap_allocator::init();
+    vm::heap_allocator::init();
     arch::before_all_init();
     logger::init();
     vm::init();
diff --git a/framework/jinux-frame/src/vm/frame_allocator.rs b/framework/jinux-frame/src/vm/frame_allocator.rs
index 38487a24b..b135062cd 100644
--- a/framework/jinux-frame/src/vm/frame_allocator.rs
+++ b/framework/jinux-frame/src/vm/frame_allocator.rs
@@ -3,9 +3,10 @@ use buddy_system_allocator::FrameAllocator;
 use log::info;
 use spin::Once;
 
+use crate::arch::boot::{MemoryRegion, MemoryRegionType};
 use crate::{config::PAGE_SIZE, sync::SpinLock};
 
-use super::{frame::VmFrameFlags, MemoryRegion, MemoryRegionType, VmFrame};
+use super::{frame::VmFrameFlags, VmFrame};
 
 pub(super) static FRAME_ALLOCATOR: Once<SpinLock<FrameAllocator>> = Once::new();
 
diff --git a/framework/jinux-frame/src/heap_allocator.rs b/framework/jinux-frame/src/vm/heap_allocator.rs
similarity index 100%
rename from framework/jinux-frame/src/heap_allocator.rs
rename to framework/jinux-frame/src/vm/heap_allocator.rs
diff --git a/framework/jinux-frame/src/vm/mod.rs b/framework/jinux-frame/src/vm/mod.rs
index f284ab9f1..e44e1357c 100644
--- a/framework/jinux-frame/src/vm/mod.rs
+++ b/framework/jinux-frame/src/vm/mod.rs
@@ -8,6 +8,7 @@ pub type Paddr = usize;
 
 mod frame;
 mod frame_allocator;
+pub(crate) mod heap_allocator;
 mod io;
 mod memory_set;
 mod offset;