fix memory leak

am/arch/mips32-npc/img/boot/start.S

@@ -1,8 +1,10 @@
 .globl _start
 .type _start, @function
+.globl _qemu
+.type _qemu, @function
 
 _start:
-  li $sp, 0x0001fffc
+  li $sp, 0x00017ffc
   jal main
 
 .globl _qemu

am/arch/mips32-npc/img/build

@@ -13,6 +13,7 @@ KERN=$(readlink -f ./build/kernel.o)
 # generate COE
 mips-linux-gnu-objdump -d $KERN > ./build/code.txt
 mips-linux-gnu-objcopy -O binary $KERN ./build/kernel.bin
+readelf -a $KERN > ./build/kernel.elf
 python $DIR/scripts/bin2text.py ./build/kernel.bin ./build/ram.txt
 python $DIR/scripts/gen_bram_coe.py ./build/kernel.bin ./build/app.coe
 

am/arch/mips32-npc/include/npc.h

@@ -2,15 +2,23 @@
 #define __NPC_H__
 
 #define VMEM_ADDR ((void *)0xc0000000)
-#define SCR_WIDTH 320
-#define SCR_HEIGHT 240
+#define SCR_WIDTH 40
+#define SCR_HEIGHT 30
 #define SCR_SIZE (SCR_WIDTH * SCR_HEIGHT)
-//outside R G B(outside draw_p)
+#define KEY_CODE_ADDR ((volatile unsigned int *)0xf0000000)
+#define KEY_CODE (*KEY_CODE_ADDR)
+#define HEAP_START 17fff
+#define HEAP_END 1fffc
+#define STACK_END ffff
+#define STACK_START 17ffc
+#define DATA_START 7fff
+#define DATA_END fffc
+#define CODE_START 0
+#define CODE_END 7ffc
 static inline u8 R(_Pixel p) { return p >> 16; }
 static inline u8 G(_Pixel p) { return p >> 8; }
 static inline u8 B(_Pixel p) { return p; }
 
-//inside R G B(print draw_p)
 static inline _Pixel pixel(u8 r, u8 g, u8 b) {
   return (r << 16) | (g << 8) | b;
 }
@@ -18,7 +26,4 @@ void vga_init();
 void serial_init();
 void memory_init();
 
-#define KEY_CODE_ADDR ((volatile unsigned int *)0xf0000000)
-#define KEY_CODE (*KEY_CODE_ADDR)
-
 #endif

am/arch/mips32-npc/src/am.c

@@ -1,8 +1,6 @@
 #include <am.h>
 #include <npc.h>
 
-// TODO: implement these functions.
-
 void _trm_init() {
 	serial_init();
 	memory_init();

am/arch/mips32-npc/src/trm.c

@@ -2,8 +2,13 @@
 #include <npc.h>
 
 void memory_init(){
+//0-7fff for code(32k)
+//8000-ffff for data(32k)
+//10000-17fff for stack(32k)
+//18000-1ffff for heap(32k)
 	//probe a memory for heap
-	_heap.start = _heap.end;
+	_heap.start = (void *)0x18000;
+	_heap.end = (void *)0x1ffff;
 }
 
 void serial_init(){

apps/nop/README.md

@@ -0,0 +1,5 @@
+# Nop
+最简单的空程序，用来判定当前kernel所占用内存空间大小
+
+# issue
+在保证内存空间的基础上，进行内存管理，合理分配堆栈，并使用脚本进行检查

apps/nop/src/main.c

@@ -0,0 +1,6 @@
+#include <am.h>
+#include <klib.h>
+
+int main(){
+	return 0;
+}

apps/video/include/video.h

@@ -1,7 +1,7 @@
 #include <am.h>
 
 const int FPS = 30;
-const int N = 96;
+const int N = 20;
 const bool scale = true;
 
 static inline _Pixel pixel(u8 r, u8 g, u8 b) {
@@ -11,6 +11,6 @@ static inline u8 R(_Pixel p) { return p >> 16; }
 static inline u8 G(_Pixel p) { return p >> 8; }
 static inline u8 B(_Pixel p) { return p; }
 
-//extern _Pixel canvas[N][N];
+extern _Pixel canvas[N][N];
 
 void redraw();

apps/video/src/main.cpp

@@ -2,12 +2,9 @@
 #include <video.h>
 #include <klib.h>
 
-//_Pixel canvas[N][N];
-//bool used[N][N];
-//_Pixel fb[1024*768];
-_Pixel **canvas = (_Pixel **)0x100000;
-bool **used = (bool **)0x200000;
-_Pixel *fb = (_Pixel *)0x300000;
+_Pixel canvas[N][N];
+bool used[N][N];
+_Pixel fb[40 * 30];
 
 void redraw() {
   int w = _screen.width;