# Adapted from Marcus' AICA example among a few other sources =).text.globl	arm_main.globl	timer.globl	jps# Exception vectors	b	start	b	undef	b	softint	b	pref_abort	b	data_abort	b	rsrvd	b	irq# FIQ code adapted from the Marcus AICA examplefiq:	# Save regs	#stmdb	sp!, {r0-r14}	# Grab interrupt type (store as parameter)	ldr	r8,intreq	ldr	r9,[r8]	and	r9,r9,#7	cmp	r9,#2	bne	fiq_done	# Type 2 is timer interrupt. Increment timer variable.	adr	r8,timer	ldr	r9,[r8]	add	r9,r9,#1	str	r9,[r8]		# Request a new timer interrupt. We'll calculate the number	# put in here based on the "jps" (jiffies per second). 	ldr	r8, timer_control	mov	r9,#256-(44100/4410)#	ldr	r9,jps	str	r9,[r8,#0x10]	mov	r9,#0x40	str	r9,[r8,#0x24]	b	fiq_done		# Return from interruptfiq_done:	# Clear interrupt	ldr	r8,intclr	mov	r9,#1	str	r9,[r8]	str	r9,[r8]	str	r9,[r8]	str	r9,[r8]	# Restore regs and return	#ldmdb	sp!, {r0-r14}	subs	pc,r14,#4intreq:	.long	0x00802d00intclr:	.long	0x00802d04timer_control:	.long	0x00802880timer:	.long	0jps:	.long	256-(44100/1000)start:	# Setup a basic stack, disable IRQ, enable FIQ	mov	sp,#0xb000	mrs	r10,CPSR	orr	r10,r10,#0x80	bic	r10,r10,#0x40	msr	CPSR_all,r10	# Call the main for the SPU	bl	arm_main	# Loop infinitely if we get herehere:	b	here# Handlers we don't bother to catchundef:softint:	mov	pc,r14pref_abort:data_abort:irq:rsrvd:	sub	pc,r14,#4