diff --git a/dbgq b/gdbq
similarity index 50%
rename from dbgq
rename to gdbq
index 9be1584..5ca3e04 100644
--- a/dbgq
+++ b/gdbq
@@ -1,4 +1,4 @@
 file out/secxkrnl.elf
-set arch i386:x86-64:intel
+set arch i386:x86-64
 target remote localhost:1234
-break sys_entry_64.high
+break hmain
\ No newline at end of file
diff --git a/gdbw b/gdbw
new file mode 100644
index 0000000..e5e8d74
--- /dev/null
+++ b/gdbw
@@ -0,0 +1,3 @@
+disconnect
+set arch i386:x86-64:intel
+target remote localhost:1234
\ No newline at end of file
diff --git a/hal/boot.asm.in b/hal/boot.asm.in
index 5336eb5..be17e82 100644
--- a/hal/boot.asm.in
+++ b/hal/boot.asm.in
@@ -141,9 +141,8 @@ sys_entry_64:
     mov ss,ax
 
     mov rsp, init_stack
-    xor edi, edi
+    xor rdi, rdi
     mov edi, dword [multiboot_info_ptr]
-    mov rdi, rsi
     call hmain
 .end:
     hlt
diff --git a/hal/boot.c b/hal/boot.c
index 4e61021..d5f3736 100644
--- a/hal/boot.c
+++ b/hal/boot.c
@@ -4,6 +4,7 @@
 #include "cpu.h"
 #include "kernel.h"
 #include "hal.h"
+#include "multiboot2.h"
 
 //static void
 //halp_obtain_cpu_info(struct boot_info *hal_info)
@@ -21,17 +22,46 @@
 //}
 
 void HABI
-hmain(void *m_info)
+hmain(struct multiboot_tag *mb_info)
 {
-    if (m_info == NULL || (uint64) m_info & bit_field_mask(0, 2))
+    if (mb_info == NULL)
     {
-        hal_halt_cpu();
+        goto err;
     }
 
-    // init HAL infrastructures
-    hal_print_init();
-    hal_mem_init();
+    char *cur_ptr = (char *) mb_info + 8;
+    char *bootloader_name = NULL;
 
+    while (1)
+    {
+        struct multiboot_tag *cur_tag = (struct multiboot_tag *) cur_ptr;
+        switch (cur_tag->type)
+        {
+            case MULTIBOOT_TAG_TYPE_MMAP:
+                hal_mem_init((struct multiboot_tag_mmap*) cur_ptr);
+                break;
+            case MULTIBOOT_TAG_TYPE_FRAMEBUFFER:
+                hal_print_init((struct multiboot_tag_framebuffer *) cur_ptr);
+                break;
+            case MULTIBOOT_TAG_TYPE_BOOT_LOADER_NAME:
+                bootloader_name = ((struct multiboot_tag_string*)cur_ptr)->string;
+                break;
+            case MULTIBOOT_TAG_TYPE_ACPI_NEW:
+            default:
+                break;
+        }
+
+        if (cur_tag->type == MULTIBOOT_TAG_TYPE_END)
+        {
+            break;
+        }
+
+        cur_ptr += cur_tag->size;
+        cur_ptr = (char *) ALIGN(uintptr, cur_ptr, 8);
+    }
+    hal_halt_cpu();
+
+    hal_printf("Boot loader:%d\n", bootloader_name);
 
     struct boot_info *boot_info = halloc(sizeof(struct boot_info));
 
@@ -45,4 +75,6 @@ hmain(void *m_info)
     }
 
     kmain(boot_info);
+err:
+    hal_halt_cpu();
 }
diff --git a/hal/inc/mem.h b/hal/inc/mem.h
index ff6749b..bb1e8b3 100644
--- a/hal/inc/mem.h
+++ b/hal/inc/mem.h
@@ -2,6 +2,7 @@
 
 #include "cdef.h"
 #include "mem.h"
+#include "multiboot2.h"
 
 /**
  Global Descriptors Table Definitions
@@ -106,5 +107,5 @@ void
 hfree(void *ptr);
 
 void
-hal_mem_init(void);
+hal_mem_init(struct multiboot_tag_mmap *info);
 
diff --git a/hal/inc/multiboot2.h b/hal/inc/multiboot2.h
index 3691fe5..12e09cc 100644
--- a/hal/inc/multiboot2.h
+++ b/hal/inc/multiboot2.h
@@ -110,7 +110,7 @@ struct multiboot_header_tag_information_request
     multiboot_uint16_t type;
     multiboot_uint16_t flags;
     multiboot_uint32_t size;
-    multiboot_uint32_t requests[0];
+    multiboot_uint32_t requests[];
 };
 
 struct multiboot_header_tag_address
@@ -188,7 +188,7 @@ struct multiboot_tag_string
 {
     multiboot_uint32_t type;
     multiboot_uint32_t size;
-    char string[0];
+    char string[];
 };
 
 struct multiboot_tag_module
@@ -197,7 +197,7 @@ struct multiboot_tag_module
     multiboot_uint32_t size;
     multiboot_uint32_t mod_start;
     multiboot_uint32_t mod_end;
-    char cmdline[0];
+    char cmdline[];
 };
 
 struct multiboot_tag_basic_meminfo
@@ -223,7 +223,7 @@ struct multiboot_tag_mmap
     multiboot_uint32_t size;
     multiboot_uint32_t entry_size;
     multiboot_uint32_t entry_version;
-    struct multiboot_mmap_entry entries[0];
+    struct multiboot_mmap_entry entries[];
 };
 
 struct multiboot_vbe_info_block
@@ -276,7 +276,7 @@ struct multiboot_tag_framebuffer
         struct
         {
             multiboot_uint16_t framebuffer_palette_num_colors;
-            struct multiboot_color framebuffer_palette[0];
+            struct multiboot_color framebuffer_palette[];
         };
         struct
         {
@@ -297,7 +297,7 @@ struct multiboot_tag_elf_sections
     multiboot_uint32_t num;
     multiboot_uint32_t entsize;
     multiboot_uint32_t shndx;
-    char sections[0];
+    char sections[];
 };
 
 struct multiboot_tag_apm
@@ -336,28 +336,28 @@ struct multiboot_tag_smbios
     multiboot_uint8_t major;
     multiboot_uint8_t minor;
     multiboot_uint8_t reserved[6];
-    multiboot_uint8_t tables[0];
+    multiboot_uint8_t tables[];
 };
 
 struct multiboot_tag_old_acpi
 {
     multiboot_uint32_t type;
     multiboot_uint32_t size;
-    multiboot_uint8_t rsdp[0];
+    multiboot_uint8_t rsdp[];
 };
 
 struct multiboot_tag_new_acpi
 {
     multiboot_uint32_t type;
     multiboot_uint32_t size;
-    multiboot_uint8_t rsdp[0];
+    multiboot_uint8_t rsdp[];
 };
 
 struct multiboot_tag_network
 {
     multiboot_uint32_t type;
     multiboot_uint32_t size;
-    multiboot_uint8_t dhcpack[0];
+    multiboot_uint8_t dhcpack[];
 };
 
 struct multiboot_tag_efi_mmap
@@ -366,7 +366,7 @@ struct multiboot_tag_efi_mmap
     multiboot_uint32_t size;
     multiboot_uint32_t descr_size;
     multiboot_uint32_t descr_vers;
-    multiboot_uint8_t efi_mmap[0];
+    multiboot_uint8_t efi_mmap[];
 };
 
 #endif /* ! ASM_FILE */
diff --git a/hal/inc/print.h b/hal/inc/print.h
index 0a73d08..6392261 100644
--- a/hal/inc/print.h
+++ b/hal/inc/print.h
@@ -1,6 +1,7 @@
 #pragma once
 #include "cdef.h"
 #include "print.h"
+#include "multiboot2.h"
 
 void
 hal_assert(uint32 expression, char *message);
@@ -12,4 +13,4 @@ void
 hal_clear_screen(void);
 
 void
-hal_print_init(void);
+hal_print_init(struct multiboot_tag_framebuffer* info);
diff --git a/hal/mb_hdr.asm.in b/hal/mb_hdr.asm.in
index f4df5cc..542a0d2 100644
--- a/hal/mb_hdr.asm.in
+++ b/hal/mb_hdr.asm.in
@@ -21,11 +21,10 @@ start_hdr:
 align MULTIBOOT_INFO_ALIGN
     dw MULTIBOOT_HEADER_TAG_INFORMATION_REQUEST
     dw 0 ; flag
-    dd (8+4*4) ; size
+    dd (8+4*3) ; size
     dd MULTIBOOT_TAG_TYPE_BOOT_LOADER_NAME
     dd MULTIBOOT_TAG_TYPE_MMAP
     dd MULTIBOOT_TAG_TYPE_ACPI_NEW
-    dd MULTIBOOT_TAG_TYPE_BOOTDEV
 ;====================
 align MULTIBOOT_INFO_ALIGN
     dw MULTIBOOT_HEADER_TAG_FRAMEBUFFER; type=5
diff --git a/hal/mem.c b/hal/mem.c
index f6b1bc8..2bd98d4 100644
--- a/hal/mem.c
+++ b/hal/mem.c
@@ -148,8 +148,7 @@ hal_write_segment_descriptor(void *const gdt, uint32 const base, uint32 const li
     ((uint8 *) gdt)[7] = (uint8) ((seg_desc >> 56) & 0xFF);
 }
 
-static
-void _hal_init_gdt(void)
+void hal_init_gdt(void)
 {
     uint32 coreid = hal_get_core_id();
     // get gdt ready
@@ -181,20 +180,19 @@ void _hal_init_gdt(void)
 }
 
 void
-hal_mem_init()
+hal_mem_init(struct multiboot_tag_mmap *info)
 {
-    _hal_init_gdt();
-    hal_heap_used = 0;
+    UNREFERENCED(info);
 }
 
 void *
 halloc(uint32 size)
 {
-    void* ret;
+    void *ret;
     ret = NULL;
-    if(hal_heap_used + size < HAL_HEAP_SIZE)
+    if (hal_heap_used + size < HAL_HEAP_SIZE)
     {
-        ret = (void*)((uintptr)hal_heap + hal_heap_used);
+        ret = (void *) ((uintptr) hal_heap + hal_heap_used);
         hal_heap_used += size;
     }
     return ret;
@@ -206,5 +204,5 @@ hfree(void *ptr)
     /**
      * Do nothing for now since salloc not available in HAL
      */
-     UNREFERENCED(ptr);
+    UNREFERENCED(ptr);
 }
diff --git a/hal/print.c b/hal/print.c
index 5c43c4e..224c5a9 100644
--- a/hal/print.c
+++ b/hal/print.c
@@ -10,9 +10,9 @@
 static uint64 text_pos;
 
 void
-hal_print_init(void)
+hal_print_init(struct multiboot_tag_framebuffer* info)
 {
-    text_pos = 0;
+    UNREFERENCED(info);
 }
 
 static void
diff --git a/inc/cdef.h b/inc/cdef.h
index 1a415d7..9687987 100644
--- a/inc/cdef.h
+++ b/inc/cdef.h
@@ -24,6 +24,8 @@ typedef _Bool bool;
 
 #define PRAGMA_ALIGN(x) __attribute__ ((aligned(x)))
 
+#define ALIGN(type, num, align) (((type)(num) + ((type)align - 1)) & ~((type)align - 1))
+
 #define UNREFERENCED(x) {(x) = (x);}
 
 #define KABI __attribute__((sysv_abi))
diff --git a/mk/grub.cfg b/mk/grub.cfg
index 73fa1c8..b27672b 100644
--- a/mk/grub.cfg
+++ b/mk/grub.cfg
@@ -1,3 +1,6 @@
+set timeout=0
+set default=0
+
 menuentry "secX" {
 	multiboot2 /secX/secxkrnl.elf
 }
\ No newline at end of file
diff --git a/runq.sh b/runq.sh
index 9391862..003a80a 100644
--- a/runq.sh
+++ b/runq.sh
@@ -1,4 +1,4 @@
 #!/bin/bash
-qemu-system-x86_64 -bios qemu_bios.bin -vnc :10 -monitor stdio -cdrom out/secxkrnl.iso -s -S -no_reboot
+qemu-system-x86_64 -bios qemu_bios.bin -vnc :10 -monitor stdio -cdrom out/secxkrnl.iso -s -S -no-reboot