.text

.global _start

_start:

         ldr sp,=

         bl disable_watch_dog

         bl enable_sdram

         bl copy_2th_to_sdram

         bl creat_page_table

         bl enable_mmu

         ldr sp,=0xb4000000

         ldr pc,=0xb0004000

loop1:

     b loop1

void disable_watch_dog(void)

{

    (*(unsigned long *)0x53000000)=;

}

void enable_sdram(void)

{

    unsigned long sdram_conf[]={0x22011110,0x00000700,0x00000700,0x00000700,0x00000700,0x00000700,0x00000700,0x00018005,0x00018005,0x008c07a3,0x000000b1,0x00000030,0x00000030};

    unsigned long* sdram_register=(unsigned long *)0x48000000;

    int i=;

    for(i=;i<;i++)  sdram_register[i]=sdram_conf[i];

}

void copy_2th_to_sdram(void)

{

    unsigned int *sour=(unsigned int *);

    unsigned int *dest=(unsigned int *)0x30004000;

    while(sour<(unsigned int *))

    {

        *dest=*sour;

        sour++;

        dest++;

    }

}

void creat_page_table(void)

{

    #define SET_AP       (3<<10)

    #define SET_DOMINE   (0<<5)

    #define SET_4         (1<<4)

    #define SET_C        (1<<3)

    #define SET_B        (1<<2)

    #define SET_0        (2)

    #define mmu_cache  (SET_AP|SET_DOMINE|SET_4|SET_C|SET_B|SET_0)

    #define mmu        (SET_AP|SET_DOMINE|SET_4|SET_0)

    unsigned long vir_ad=,phy_ad=;

    unsigned long *mmu_base_ad=(unsigned long *)0x30000000;

    /*steppingstone*/

    vir_ad=;

    phy_ad=;

    *(mmu_base_ad+(vir_ad>>))=(phy_ad & 0xfff00000)|mmu_cache;

    /*gpio*/

    vir_ad=0xa0000000;

    phy_ad=0x56000000;

    *(mmu_base_ad +( vir_ad>>))=(phy_ad & 0xfff00000)|mmu;

    /*sdram*/

     vir_ad=0xb0000000;

     phy_ad=0x30000000;

     while(vir_ad<0xb4000000)

     {

         *(mmu_base_ad +(vir_ad>>))=(phy_ad&0xfff00000)|mmu_cache;

         vir_ad+=0x100000;

         phy_ad+=0x100000;

     }

}

void enable_mmu(void)

{

    unsigned long ttb=0x30000000;

      __asm__

    (

      "mov r0,#0\n"                        /**/

      "mcr p15,0,r0,c7,c7,0\n"             /*使无效icache dcache*/

      "mcr p15,0,r0,c7,c10,4\n"            /*清空*/

      "mcr p15,0,r0,c8,c7,0\n"             /*使无效itlb dtlb*/

      "mov r4,%0\n"                        /*页表基地址*/

      "mcr p15,0,r4,c2,c0,0\n"             /**/

      "mvn r0,#0\n"                        /**/

      "mcr p15,0,r0,c3,c0,0\n"             /*域访问控制器为可读写*/

      "mrc p15,0,r0,c1,c0,0\n"             /*读控制器的值*/

      "bic r0,r0,#0x3000\n"                /*先清除 再是能*/

      "bic r0,r0,#0x0300\n"                /**/

      "bic r0,r0,#0x0087\n"                /**/

      "orr r0,r0,#0x0002\n"                /*使能对齐检查*/

      "orr r0,r0,#0x0004\n"                /*是能cache_buff*/

      "orr r0,r0,#0x1000\n"                /*使能icache*/

      "orr r0,r0,#0x0001\n"                /*使能mmu*/

          "mcr p15,0,r0,c1,c0,0\n"

          :                                /**/

      :"r"(ttb)                            /**/

    );

}

#define GPFCON (*(unsigned long *)0x56000050)

#define GPFDAT (*(unsigned long *)0x56000054)

#define LED1_ON   (1<<8)

#define LED2_ON   (1<<10)

#define LED3_ON   (1<<12)

static inline delay(unsigned long num)

{

    while(--num);

}

int main(void)

{

    GPFCON=LED1_ON|LED2_ON|LED3_ON;

    while()

    {

        GPFDAT=~(<<);

        delay();

        GPFDAT=~(<<);

        delay();

        GPFDAT=~(<<);

        delay();

    }

    return ;

}

SECTIONS

{

    first 0x00000000 :{start.o init.o}

    seconed 0xb0004000:AT(){leds.o}

}

objs:=start.o init.o leds.o

mmu.bin:$(objs)

    arm-linux-ld -Tmmu.lds -o mmu_elf $^

    arm-linux-objcopy -O binary -S mmu_elf $@

    arm-linux-objdump -D -m arm mmu_elf > mmu.dis

%.o:%.c

    arm-linux-gcc -Wall -O2 -o $@ -c $<

%.o:%.s

    arm-linux-gcc -Wall -O2 -o $@ -c $<

clean:

    rm -f *.bin *.o *.dis mmu_elf