From 03d32c476b113e42f989c46af9c0c1c6d257eaa3 Mon Sep 17 00:00:00 2001
From: hinus <hinus@163.com>
Date: Mon, 16 Aug 2021 08:42:57 +0800
Subject: [PATCH] Title: debug level Issue:
 https://gitee.com/hinus/linux_kernel_011/issues/I45O6U Description: Define 4
 debug levels in makefile.

---
 Makefile          | 2 +-
 kernel/Makefile   | 5 +++--
 kernel/sys_call.S | 6 +++++-
 tools/build.c     | 4 ++--
 4 files changed, 11 insertions(+), 6 deletions(-)

diff --git a/Makefile b/Makefile
index cefc423..469eec4 100644
--- a/Makefile
+++ b/Makefile
@@ -11,7 +11,7 @@ linux.img : tools/build bootsect setup kernel/system
 tools/build : tools/build.c
 		gcc -o $@ $<
 
-kernel/system : kernel/head.S kernel/*.c mm/*.c kernel/blk_drv/*.c fs/*.c
+kernel/system : kernel/*.S kernel/*.c mm/*.c kernel/blk_drv/*.c fs/*.c
 		cd kernel; make system; cd ..
 
 bootsect : bootsect.o
diff --git a/kernel/Makefile b/kernel/Makefile
index 0f25438..8311094 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -1,5 +1,6 @@
 GCC := gcc
-CCFLAG := -I../include -nostdinc -ffreestanding -Wall -fomit-frame-pointer -fno-pic -fno-stack-protector -c -m32
+USE_DEBUG :=
+CCFLAG := -I../include -nostdinc -ffreestanding -Wall -fomit-frame-pointer -fno-pic -fno-stack-protector -c -m32 $(USE_DEBUG)
 LDFLAG := -Ttext 0x0 -s --oformat binary -m elf_i386
 INCDIR := ../include
 OBJS   := head.o main.o sys_call.o asm.o sched.o printk.o vsprintf.o mktime.o \
@@ -14,7 +15,7 @@ head.o : head.S
 	$(GCC) -m32 -traditional -c -o $@ $<
 
 sys_call.o : sys_call.S
-	$(GCC) -m32 -traditional -c -o $@ $<
+	$(GCC) $(USE_DEBUG) -m32 -traditional -c -o $@ $<
 
 asm.o : asm.S
 	$(GCC) -m32 -traditional -c -o $@ $<
diff --git a/kernel/sys_call.S b/kernel/sys_call.S
index 541cbc7..c7506ba 100644
--- a/kernel/sys_call.S
+++ b/kernel/sys_call.S
@@ -56,11 +56,15 @@ system_call:
     movl  $0x17, %edx
     movw  %dx, %fs
 
+#ifdef DEBUG
+#if DEBUG > 1
     pushl %eax
     pushl $show_ind
-    //call  printk
+    call  printk
     popl  %eax
     popl  %eax
+#endif
+#endif
 
     call *sys_call_table(, %eax, 4)
     pushl %eax
diff --git a/tools/build.c b/tools/build.c
index df7cf9d..6cf7bd3 100644
--- a/tools/build.c
+++ b/tools/build.c
@@ -12,8 +12,8 @@
 
 #define SYS_SIZE 0x2000
 
-#define DEFAULT_MAJOR_ROOT 2
-#define DEFAULT_MINOR_ROOT 29
+#define DEFAULT_MAJOR_ROOT 3
+#define DEFAULT_MINOR_ROOT 1
 
 #define SETUP_SECTS 4
 
-- 
Gitee