ARM启动文件2440init.s分析

nop

nop

nop

nop

ldr r0, = REFRESH

ldr r1, [r0]

bic r1, r1, #0xff

bic r1, r1, #(0x7<8)

orr r1, r1, #0x470 ; REFCNT135

str r1, [r0]

nop

nop

nop

nop

nop

mov pc, lr

CLKdiv144

ldr r0, = CLKdivN

ldr r1, = 0x4 ;0x4 = 1:4:4

str r1, [r0]

; waituntil clock is stable

nop

nop

nop

nop

nop

ldr r0, = REFRESH

ldr r1, [r0]

bic r1, r1, #0xff

bic r1, r1, #(0x7<8)

orr r1, r1, #0x630 ; REFCNT675 - 1520

str r1, [r0]

nop

nop

nop

nop

nop

mov pc, lr

;------------------------------------------------------------------------------------------------

ALIGN

;------------------------------------------------------------------------------------------------

;定义数据段

;^ 标志等价于MAP伪指令

;MAP用于定义一个结构化的内存表首地址，此时内存表的位置计数器值，也变成该首地址值，就相当于在这个地

;址处操作

;#于FIELD同义，用于定义一个结构化的内存表的数据域，后边数字表示该数据占用的字节数

;Handle*** 在此就是一个标号，为了标示数据量

;用法：把对应的终端处理函数的首地址，放到这里的对应的预留空间处，当发生中断时，就能根据宏函数，直

;接跳转

AREA RamData, DATA, READWRITE

^ _ISR_STARTADDRESS ; _ISR_STARTADDRESS=0x33FF_FF00

HandleReset # 4

HandleUndef # 4

HandleSWI # 4

HandlePabort # 4

HandleDabort # 4

HandleReserved # 4

HandleIRQ # 4

HandleFIQ # 4

;Do not use the label IntVectorTable,

;The value of IntVectorTable is differentwith the address you think it may be.

;IntVectorTable

;@0x33FF_FF20

HandleEINT0 # 4

HandleEINT1 # 4

HandleEINT2 # 4

HandleEINT3 # 4

HandleEINT4_7 # 4

HandleEINT8_23 # 4

HandleCAM # 4 ;Added for 2440.

HandleBATFLT # 4

HandleTICK # 4

HandleWDT # 4

HandleTIMER0 # 4

HandleTIMER1 # 4

HandleTIMER2 # 4

HandleTIMER3 # 4

HandleTIMER4 # 4

HandleUART2 # 4

;@0x33FF_FF60

HandleLCD # 4

HandleDMA0 # 4

HandleDMA1 # 4

HandleDMA2 # 4

HandleDMA3 # 4

HandleMMC # 4

HandleSPI0 # 4

HandleUART1 # 4

HandleNFCON # 4 ;Added for 2440.

HandleUSBD # 4

HandleUSBH # 4

HandleIIC # 4

HandleUART0 # 4

HandleSPI1 # 4

HandleRTC # 4

HandleADC # 4

;@0x33FF_FFA0

END