diff --git a/Makefile b/Makefile
index 15cf69f..912caaf 100644
--- a/Makefile
+++ b/Makefile
@@ -12,7 +12,7 @@ _bd:
 
 all: _bd $(OBJ)
 	@echo "* Linking EFI..."
-	@ld $(LDFLAGS) gnu-efi/x86_64/gnuefi/crt0-efi-x86_64.o build/boot.o build/graphics/draw.o build/graphics/context.o build/kernel/main.o build/kernel/serial.o build/fonts/pixel_font.o -o build/boot.so $(LDLIBS)
+	@ld $(LDFLAGS) gnu-efi/x86_64/gnuefi/crt0-efi-x86_64.o $(OBJ) -o build/boot.so $(LDLIBS)
 	@objcopy -j .text -j .sdata -j .data -j .rodata -j .dynamic -j .dynsym -j .rel -j .rela -j .rel.* -j .rela.* -j .reloc --output-target efi-app-x86_64 --subsystem=10 build/boot.so build/BOOTX64.EFI
 
 build/%.o: %.c
diff --git a/fonts/pixel_font.cpp b/fonts/pixel_font.cpp
index 1aef619..188dee3 100644
--- a/fonts/pixel_font.cpp
+++ b/fonts/pixel_font.cpp
@@ -1,12 +1,28 @@
-#include <fonts/sylva_sd.h>
+#include <fonts/hankaku.h>
 #include <fonts/pixel_font.h>
 #include <graphics/draw.h>
 #include <common.h>
 
+static unsigned int pf_x = 0;
+static unsigned int pf_y = 1;
+
+void pf_reset_position(void) {
+    // 其实应该还要清一下屏，后面思考一个安全的做法
+    pf_x = 0;
+    pf_y = 1;
+}
+
 void pf_print_char(char c, unsigned int basex, unsigned int basey, EFI_GRAPHICS_OUTPUT_BLT_PIXEL color) {
     for (unsigned int y = 0; y < 16; y++) {
         unsigned char data = hankaku_pixels[c][y];
         for (int x = 7; x >= 0; x--) {
+            // 解码Hankaku字体
+            /*
+            既然都在这了，就讲一下Hankaku字体是如何解码的
+            比如一个
+            {0x00, 0x82, 0x82, 0x44, 0x44, 0x44, 0x28, 0x28, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x00, 0x00}
+            每一个Hex代表一行，比如0x82就是一行，转换成Bin得到10000010，1代表有像素，0代表没像素
+            */
             unsigned int current = data & 1;
             data >>= 1;
             if (current)
@@ -15,8 +31,27 @@ void pf_print_char(char c, unsigned int basex, unsigned int basey, EFI_GRAPHICS_
     }
 }
 
-void pf_print(char* text, unsigned int basex, unsigned int basey, EFI_GRAPHICS_OUTPUT_BLT_PIXEL color) {
+void pf_print(const char* text, EFI_GRAPHICS_OUTPUT_BLT_PIXEL color) {
     for (unsigned int i = 0; i < strlen(text); i++) {
-        pf_print_char(text[i], basex + 9 * i, basey, color);
+        char c = text[i];
+        if (c == '\n') {
+            pf_x = 0;
+            pf_y++;
+            if ((pf_y - 1) * 16 >= g_gfx.vr) {
+                gfx_clear();
+                pf_y = 1;
+            }
+            continue;
+        }
+        if (pf_x * 9 + 9 > g_gfx.hr) {
+            pf_x = 0;
+            pf_y++;
+            if ((pf_y - 1) * 16 >= g_gfx.vr) {
+                gfx_clear();
+                pf_y = 1;
+            }
+        }
+        pf_print_char(c, pf_x * 9, (pf_y - 1) * 16, color);
+        pf_x++;
     }
 }
\ No newline at end of file
diff --git a/graphics/context.cpp b/graphics/context.cpp
index 0042ab9..c90894a 100644
--- a/graphics/context.cpp
+++ b/graphics/context.cpp
@@ -7,4 +7,9 @@ void gfx_init(EFI_GRAPHICS_OUTPUT_PROTOCOL *GOP) {
     g_gfx.hr = GOP->Mode->Info->HorizontalResolution;
     g_gfx.vr = GOP->Mode->Info->VerticalResolution;
     g_gfx.base = (EFI_GRAPHICS_OUTPUT_BLT_PIXEL *) GOP->Mode->FrameBufferBase;
+}
+
+void gfx_clear(void) {
+    EFI_GRAPHICS_OUTPUT_BLT_PIXEL black = {0, 0, 0, 0};
+    g_gfx.GOP->Blt(g_gfx.GOP, &black, EfiBltVideoFill, 0, 0, 0, 0, g_gfx.hr, g_gfx.vr, 0);
 }
\ No newline at end of file
diff --git a/include/BUILD_INFOS.h b/include/BUILD_INFOS.h
new file mode 100644
index 0000000..76ddf40
--- /dev/null
+++ b/include/BUILD_INFOS.h
@@ -0,0 +1,5 @@
+#pragma once
+
+// 存放各类参数定义，后续给CI用
+
+#define ENABLE_SERIAL_PRINTS true
\ No newline at end of file
diff --git a/include/common.h b/include/common.h
index d3e1c6f..11a9603 100644
--- a/include/common.h
+++ b/include/common.h
@@ -1,6 +1,8 @@
 #pragma once
 
-unsigned int strlen(char* arr) {
+#define ASM asm volatile
+
+static unsigned int strlen(const char* arr) { // 获取string长度
     int i = 0;
     while (arr[i++] != '\0');
     return i - 1;
diff --git a/include/fonts/sylva_sd.h b/include/fonts/hankaku.h
similarity index 99%
rename from include/fonts/sylva_sd.h
rename to include/fonts/hankaku.h
index 44fbbfe..542e081 100644
--- a/include/fonts/sylva_sd.h
+++ b/include/fonts/hankaku.h
@@ -1,6 +1,6 @@
 #pragma once
 
-// Hankaku 字体
+// Hankaku 字体，不动
 static unsigned char hankaku_pixels[256][16] = {
 {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
 {0x10, 0x10, 0x38, 0x38, 0x7c, 0x7c, 0xfe, 0xfe, 0x7c, 0x7c, 0x38, 0x38, 0x10, 0x10, 0x00, 0x00},
diff --git a/include/fonts/pixel_font.h b/include/fonts/pixel_font.h
index 649624b..353328e 100644
--- a/include/fonts/pixel_font.h
+++ b/include/fonts/pixel_font.h
@@ -2,5 +2,7 @@
 
 #include <graphics/context.h>
 
-void pf_print_char(char c, unsigned int basex, unsigned int basey, EFI_GRAPHICS_OUTPUT_BLT_PIXEL color = {255, 255, 255, 255});
-void pf_print(char* text, unsigned int basex, unsigned int basey, EFI_GRAPHICS_OUTPUT_BLT_PIXEL color = {255, 255, 255, 255});
\ No newline at end of file
+void pf_print_char(char c, unsigned int basex, unsigned int basey, 
+        EFI_GRAPHICS_OUTPUT_BLT_PIXEL color = {255, 255, 255, 255});                         // Pixel Font 打印字符
+void pf_print(const char* text, EFI_GRAPHICS_OUTPUT_BLT_PIXEL color = {255, 255, 255, 255}); // Pixel Font 打印string
+void pf_reset_position(void);                                                                // 重设Pixel Font Cursor位置
\ No newline at end of file
diff --git a/include/graphics/context.h b/include/graphics/context.h
index b872a21..90166c7 100644
--- a/include/graphics/context.h
+++ b/include/graphics/context.h
@@ -1,5 +1,7 @@
 #pragma once
 
+// 这个文件存在的目的是让graphics的draw功能不用每次传 GOP hr vr base
+
 #include <efi.h>
 
 struct gfx_context {
@@ -11,4 +13,5 @@ struct gfx_context {
 
 extern gfx_context g_gfx;
 
-void gfx_init(EFI_GRAPHICS_OUTPUT_PROTOCOL *GOP);
\ No newline at end of file
+void gfx_init(EFI_GRAPHICS_OUTPUT_PROTOCOL *GOP); // 初始化 GFX
+void gfx_clear(void);                             // 清空 GFX（相当于重置）
\ No newline at end of file
diff --git a/include/graphics/draw.h b/include/graphics/draw.h
index db7cbb4..5b08c9e 100644
--- a/include/graphics/draw.h
+++ b/include/graphics/draw.h
@@ -3,4 +3,4 @@
 #include <efi.h>
 #include <graphics/context.h>
 
-void draw_pixel(unsigned int x, unsigned int y, EFI_GRAPHICS_OUTPUT_BLT_PIXEL color);
\ No newline at end of file
+void draw_pixel(unsigned int x, unsigned int y, EFI_GRAPHICS_OUTPUT_BLT_PIXEL color); // 画像素
\ No newline at end of file
diff --git a/include/serial.h b/include/serial.h
index 7602676..88ae3e0 100644
--- a/include/serial.h
+++ b/include/serial.h
@@ -3,13 +3,13 @@
 #include <efi.h>
 #include <efiser.h>
 
-struct serial_context {
+struct serial_context { // 串行内容结构体
     EFI_SERIAL_IO_PROTOCOL *SerialIo;
 };
 
 extern serial_context g_serial;
 
-void serial_init(EFI_SERIAL_IO_PROTOCOL *SerialIo);
-void serial_write(const char *str);
-void serial_write_char(char c);
-char serial_read_char();
\ No newline at end of file
+void serial_init(EFI_SERIAL_IO_PROTOCOL *SerialIo); // 初始化串行驱动
+void serial_write(const char *str);                 // 往串行写string
+void serial_write_char(char c);                     // 往串行写char（不推荐使用）
+char serial_read_char();                            // 读串行
\ No newline at end of file
diff --git a/kernel/main.cpp b/kernel/main.cpp
index 40669ef..72bc386 100644
--- a/kernel/main.cpp
+++ b/kernel/main.cpp
@@ -4,8 +4,10 @@
 #include <graphics/draw.h>
 #include <fonts/pixel_font.h>
 #include <serial.h>
+#include <common.h>
 
 inline void init_gop() {
+    // 初始化 GOP
     EFI_GUID gop_guid = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID;
     EFI_GRAPHICS_OUTPUT_PROTOCOL *GOP;
     uefi_call_wrapper((void*)ST->BootServices->SetWatchdogTimer, 4, 0, 0, 0, NULL);
@@ -14,6 +16,7 @@ inline void init_gop() {
 }
 
 inline void init_serial() {
+    // 初始化串行驱动
     EFI_SERIAL_IO_PROTOCOL *SerialIo = NULL;
     EFI_GUID gEfiSerialIoProtocolGuid = EFI_SERIAL_IO_PROTOCOL_GUID;
     EFI_HANDLE *SerialHandles = NULL;
@@ -41,15 +44,15 @@ extern "C" void kernel_main() {
     init_gop();
     init_serial();
 
+    // 都用uefi_call_wrapper，不用会PF，不知道为什么
     uefi_call_wrapper((void*)ST->ConOut->SetCursorPosition, 3, ST->ConOut, 0, 5);
     uefi_call_wrapper((void*)ST->ConOut->OutputString, 2, ST->ConOut, L"Kernel is running!\n");
 
     uefi_call_wrapper((void*)ST->ConOut->ClearScreen, 1, ST->ConOut);
-    serial_write("\n\n"); // 防止和前面串了
+    serial_write("\n\n"); // 防止和前面串了serial.log看不清
 
-    // pf_print_char('k', 10, 10);
-    pf_print("Welcome to Sylva OS!", 10, 10);
-    serial_write("Hello from serial!\n");
-    serial_write("Hello from serial line 2!");
-    while (1);
+    pf_print("Welcome to Sylva OS!\n");
+    serial_write(" Kernel prepared well, start loop.\n");
+
+    while (1) ASM ("hlt"); // 《30天》看多了 (doge
 }
\ No newline at end of file
diff --git a/kernel/serial.cpp b/kernel/serial.cpp
index f47ed62..b625f0b 100644
--- a/kernel/serial.cpp
+++ b/kernel/serial.cpp
@@ -1,5 +1,7 @@
 #include <serial.h>
 #include <efilib.h>
+#include <fonts/pixel_font.h>
+#include <BUILD_INFOS.h>
 
 serial_context g_serial;
 
@@ -9,12 +11,14 @@ void serial_init(EFI_SERIAL_IO_PROTOCOL *SerialIo) {
 }
 
 void serial_write_char(char c) {
+    // 不要直接调用，ENABLE_SERIAL_PRINTS有问题，因此不会打印DEBUG
     if (!g_serial.SerialIo) {
         uefi_call_wrapper((void*)ST->ConOut->OutputString, 2, ST->ConOut, L"serial: null io\n");
         return;
     }
     UINTN size = 1;
     EFI_STATUS status = uefi_call_wrapper((void*)g_serial.SerialIo->Write, 3, g_serial.SerialIo, &size, &c);
+    // if (ENABLE_SERIAL_PRINTS) pf_print((const char*) c);
     if (status != EFI_SUCCESS) {
         uefi_call_wrapper((void*)ST->ConOut->OutputString, 2, ST->ConOut, L"serial: write failed\n");
     }
@@ -25,12 +29,14 @@ void serial_write(const char *str) {
         uefi_call_wrapper((void*)ST->ConOut->OutputString, 2, ST->ConOut, L"serial: null io\n");
         return;
     }
+    if (ENABLE_SERIAL_PRINTS) pf_print(str);
     while (*str) {
         serial_write_char(*str++);
     }
 }
 
 char serial_read_char() {
+    // 后面可能用的上，比如远程调试？
     if (!g_serial.SerialIo) return 0;
     char c = 0;
     UINTN size = 1;