cstartup1.s

ADS下基于AT91SAM7X256-EK的可以运行的uCOS-II源码

				INCLUDE		AT91SAM7X256.inc
RamEnd   	EQU		0x00210000

   IMPORT  OS_CPU_IRQ_ISR

                AREA        reset, CODE, READONLY
                

				entry

re_set
                B           InitReset           
undefvec
                B           undefvec            
swivec
                B           swivec              
pabtvec 
                B           pabtvec             
dabtvec 
                B           dabtvec             
rsvdvec 
                B           rsvdvec             
irqvec 

				ldr 		pc,=OS_CPU_IRQ_ISR
fiqvec               				


FIQ_Handler_Entry 

            mov         r9, r0
	    	ldr         r0, [r8, #AIC_FVR]
            msr         CPSR_c, #I_BIT | F_BIT | ARM_MODE_SVC


            stmfd       sp!, { r1-r3, r12, lr}


            mov         r14, pc
            bx          r0


            ldmia       sp!, { r1-r3, r12, lr}


            msr         CPSR_c, #I_BIT | F_BIT | ARM_MODE_FIQ


            mov         r0,r9


            subs        pc,lr,#4


InitReset

				ldr		r0,=0xFFFFFD08
				ldr     r1,=0xa5000001
				str		r1,[r0]
				

            	EXTERN   AT91F_LowLevelInit






            ldr     r13,=RamEnd            

	    ldr	    r0,=AT91F_LowLevelInit
        mov     lr, pc
	    bx	    r0



IRQ_STACK_SIZE  equ   (2*8*64)     



ARM_MODE_USER           EQU     0x10
ARM_MODE_FIQ            EQU     0x11
ARM_MODE_IRQ            EQU     0x12
ARM_MODE_SVC            EQU     0x13
ARM_MODE_ABORT          EQU     0x17
ARM_MODE_UNDEF          EQU     0x1B
ARM_MODE_SYS            EQU     0x1F
I_BIT equ 0x80
F_BIT equ 0x40


                ldr     r0, =RamEnd


                msr     CPSR_c, #ARM_MODE_FIQ | I_BIT | F_BIT

            	ldr     r8, =AT91C_BASE_AIC


                msr     CPSR_c, #ARM_MODE_IRQ | I_BIT | F_BIT
                mov     r13, r0                     
                sub     r0, r0, #IRQ_STACK_SIZE


                msr     CPSR_c, #ARM_MODE_SVC 
                mov     r13, r0                     







		 EXTERN	main
		 global	__main
jump_to_main
		ldr	lr,=call_exit
		ldr	r0,=main
__main
		bx	r0


call_exit
End
            b       End




IRQ_Handler_Entry


            sub         lr, lr, #4
            stmfd       sp!, {lr}

            stmfd       sp!, {r0}



            ldr         r14, =AT91C_BASE_AIC
	    	ldr         r0 , [r14, #AIC_IVR]
	    	str         r14, [r14, #AIC_IVR]


          	msr         CPSR_c, #ARM_MODE_SVC


            stmfd       sp!, { r1-r3, r12, r14}


            mov         r14, pc
            bx          r0


            ldmia       sp!, { r1-r3, r12, r14}


            msr         CPSR_c, #I_BIT | ARM_MODE_IRQ


            ldr         r14, =AT91C_BASE_AIC
            str         r14, [r14, #AIC_EOICR]


            ldmia       sp!, {r0}


            ldmia       sp!, {pc}^
            
reinter		mov r2,#AT91C_ISRAM
			mov r3,#0
rein		ldr	r1,[r3]
			str r1,[r2]
			add r3,r3,#1
			cmp r3,#4
			bne rein

		global	AT91F_Default_FIQ_handler
		global	AT91F_Default_IRQ_handler
		global	AT91F_Spurious_handler


AT91F_Default_FIQ_handler
            b     AT91F_Default_FIQ_handler

AT91F_Default_IRQ_handler
            b     AT91F_Default_IRQ_handler

AT91F_Spurious_handler
            b     AT91F_Spurious_handler



	END