vec.s

来自「ADS下的bios工程」· S 代码 · 共 249 行

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#include <bios/s3c2410x.h>#include <bios/linkage.h>/*------------------------------------------------------ * Define exception table location *------------------------------------------------------*/#define loc_reset_vector	(RESET_SDRAM_BASE)#define loc_undef_vector	(RESET_SDRAM_BASE + 4)#define loc_swi_vector		(RESET_SDRAM_BASE + 8)#define loc_prefetch_vector	(RESET_SDRAM_BASE + 12)#define loc_abort_vector	(RESET_SDRAM_BASE + 16)#define loc_reserv_vector	(RESET_SDRAM_BASE + 20)#define loc_irq_vector		(RESET_SDRAM_BASE + 24)#define loc_fiq_vector		(RESET_SDRAM_BASE + 28)/*------------------------------------------------------ * Vectered Interrupt exception table location  *------------------------------------------------------*/#define loc_eint0_vector	(RESET_SDRAM_BASE + 32)#define loc_eint1_vector	(RESET_SDRAM_BASE + 36)#define loc_eint2_vector	(RESET_SDRAM_BASE + 40)#define loc_eint3_vector	(RESET_SDRAM_BASE + 44)#define loc_eint4_vector	(RESET_SDRAM_BASE + 48)#define loc_eint5_vector	(RESET_SDRAM_BASE + 52)#define loc_eint6_vector	(RESET_SDRAM_BASE + 56)#define loc_eint7_vector	(RESET_SDRAM_BASE + 60)#define loc_tick_vector		(RESET_SDRAM_BASE + 64)#define loc_wdt_vector		(RESET_SDRAM_BASE + 68)#define loc_timer0_vector	(RESET_SDRAM_BASE + 72)#define loc_timer1_vector	(RESET_SDRAM_BASE + 76)#define loc_timer2_vector	(RESET_SDRAM_BASE + 80)#define loc_timer3_vector	(RESET_SDRAM_BASE + 84)#define loc_timer4_vector	(RESET_SDRAM_BASE + 88)#define loc_uerr_vector		(RESET_SDRAM_BASE + 92)#define loc_reserverd_vector	(RESET_SDRAM_BASE + 96)#define loc_dma0_vector		(RESET_SDRAM_BASE + 100)#define loc_dma1_vector		(RESET_SDRAM_BASE + 104)#define loc_dma2_vector		(RESET_SDRAM_BASE + 108)#define loc_dma3_vector		(RESET_SDRAM_BASE + 112)#define loc_mmc_vector		(RESET_SDRAM_BASE + 116)#define loc_spi_vector		(RESET_SDRAM_BASE + 120)#define loc_urxd0_vector	(RESET_SDRAM_BASE + 124)#define loc_urxd1_vector	(RESET_SDRAM_BASE + 128)#define loc_usbd_vector		(RESET_SDRAM_BASE + 132)#define loc_usbh_vector		(RESET_SDRAM_BASE + 136)#define loc_iic_vector		(RESET_SDRAM_BASE + 140)#define loc_utxd0_vector	(RESET_SDRAM_BASE + 144)#define loc_utxd1_vector	(RESET_SDRAM_BASE + 148)#define loc_rtc_vector		(RESET_SDRAM_BASE + 152)#define loc_adc_vector		(RESET_SDRAM_BASE + 156)/*------------------------------------------------------ * Define exception stack area *------------------------------------------------------*/#define FIQ_STACK_SIZE     0x0000400#define PREFE_STACK_SIZE   0x0000400#define ABORT_STACK_SIZE   0x0000400#define UNDEF_STACK_SIZE   0x0000400#define IRQ_STACK_SIZE     0x0004000#define SVC_STACK_SIZE     0x0010000#define FIQ_STACK_BASE     (SYMBOL_NAME(_end) + FIQ_STACK_SIZE)#define PREFE_STACK_BASE   (FIQ_STACK_BASE + PREFE_STACK_SIZE)#define ABORT_STACK_BASE   (PREFE_STACK_BASE + ABORT_STACK_SIZE)#define UNDEF_STACK_BASE   (ABORT_STACK_BASE + UNDEF_STACK_SIZE)#define IRQ_STACK_BASE     (UNDEF_STACK_BASE + IRQ_STACK_SIZE)#define SVC_STACK_BASE     (IRQ_STACK_BASE + SVC_STACK_SIZE)	.text/*------------------------------------------------------ * Useful macro for IRQ *------------------------------------------------------*/	.macro  get_irqnr, irqnr, base	ldr	\base, =INTPND	ldr	\base, [\base] 	mov	\irqnr, #00:	movs	\base, \base, lsr #1	bcs	1f	add	\irqnr, \irqnr, #1	b	0b1:	.endm /*------------------------------------------------------ * Setup stack and exception vector *------------------------------------------------------*/ENTRY(vec_init)	/* setup stack pointer */	mrs     r0, cpsr	bic     r0, r0, #LOCKOUT | MODE_MASK	orr     r2, r0, #SUP_MODE	@ exception undef stack        orr     r1, r0, #LOCKOUT | UDF_MODE        msr     cpsr, r1        msr     spsr, r2        ldr     sp, =UNDEF_STACK_BASE	@ exception abort stack        orr     r1, r0, #LOCKOUT | ABT_MODE        msr     cpsr, r1        msr     spsr, r2        ldr     sp, =ABORT_STACK_BASE	@ exception irq stack        orr     r1, r0, #LOCKOUT | IRQ_MODE        msr     cpsr, r1        msr     spsr, r2        ldr     sp, =IRQ_STACK_BASE	@ exception fiq stack        orr     r1, r0, #LOCKOUT | FIQ_MODE        msr     cpsr, r1        msr     spsr, r2        ldr     sp, =FIQ_STACK_BASE	orr     r1, r0, #LOCKOUT | SUP_MODE	msr     cpsr, r1	ldr     sp, =SVC_STACK_BASE	/* setup exception vector table */	ldr     r0, =loc_reset_vector	ldr     r1, =L_Exception_Vector_Table	mov     r2, #81:	ldr     r3, [r1], #4	str     r3, [r0], #4	subs    r2, r2, #1	bne     1b	mov	pc, lr	/* return *//*------------------------------------------------------ * Low level hardware exception handler *------------------------------------------------------*/ENTRY (undef_handler)	ldr     r13, =loc_undef_vector	ldr     r13, [r13]	mov     pc, r13ENTRY(swi_handler)	b	system_swi_handler#if 0	sub	sp, sp, #4	stmfd	sp!, {r0}	ldr	r0, =loc_swi_vector	ldr	r0, [r0]	str	r0, [sp, #4]	ldmfd	sp!, {r0, pc}#endifENTRY(prefetch_handler)	ldr     r13, =loc_prefetch_vector	ldr     r13, [r13]	mov     pc, r13ENTRY(abort_handler)	ldr     r13, =loc_abort_vector	ldr     r13, [r13]	mov     pc, r13ENTRY(irq_handler)	ldr     r13, =loc_irq_vector	ldr     r13, [r13]	mov     pc, r13ENTRY(fiq_handler)	sub	sp, sp, #4	stmfd	sp!, {r0}	ldr	r0, =loc_fiq_vector	ldr	r0, [r0]	str	r0, [sp, #4]	ldmfd	sp!, {r0, pc}/*------------------------------------------------------ * System exception handler *------------------------------------------------------*/system_undef_handler :	ldr     sp, =UNDEF_STACK_BASE	stmfd	sp!, {r0-r12, lr}	mrs	r0, spsr	mov	r1, sp@	bl	SYMBOL_NAME(Undef_action)	ldmfd	sp!, {r0-r12, pc}^system_swi_handler :	stmfd	sp!, {r0-r12, lr}	ldr	r3, [lr, #-4]	bic	r3, r3, #0xff000000@	bl	SYMBOL_NAME(swi_action)	ldmfd	sp!, {r0-r12, pc}system_prefetch_handler :	ldr     sp, =PREFE_STACK_BASE	stmfd	sp!, {r0-r12, lr}	mrs	r0, spsr	mov	r1, sp@	bl	SYMBOL_NAME(Pabort_action)	ldmfd	sp!, {r0-r12, lr}	subs	pc, lr, #4system_abort_handler :	ldr     sp, =ABORT_STACK_BASE	stmfd	sp!, {r0-r12, lr}	mrs	r0, spsr	mov	r1, sp@	bl	SYMBOL_NAME(Dabort_action)	ldmfd	sp!, {r0-r12, lr}	subs	pc, lr, #8system_reserv_handler :	sub	pc, lr, #4system_irq_handler :	ldr     sp, =IRQ_STACK_BASE	stmfd	sp!, {r0-r12, lr}	get_irqnr r0, r1@	bl	SYMBOL_NAME(do_IRQ) @ brantch to IRQ service routine	ldmfd	sp!, {r0-r12, lr}	subs	pc, lr, #4system_fiq_handler :	ldr     sp, =FIQ_STACK_BASE	stmfd	sp!, {r0-r7, lr}	mrs	r0, spsr	mov	r1, sp@	bl	SYMBOL_NAME(FIQ_action)	ldmfd	sp!, {r0-r7, lr}	subs	pc, lr, #4/*------------------------------------------------------ * Define exception table *------------------------------------------------------*/	.align 4L_Exception_Vector_Table :	.long	PHYS_SDRAM_BASE	.long	system_undef_handler	.long	system_swi_handler	.long	system_prefetch_handler	.long	system_abort_handler	.long	system_reserv_handler	.long	system_irq_handler	.long	system_fiq_handler

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