//-----------------------------------------------------------------
//	showtsc.s
//
//	programmer: ALLAN CRUSE
//	written on: 27 APR 2009
//-----------------------------------------------------------------


	.equ	dev_STDOUT, 1
	.equ	sys_WRITE, 1
	.equ	sys_EXIT, 60



	.section	.data
tscval:	.quad	0
tscmsg:	.ascii	"\n TimeStamp Counter: "
tscbuf:	.ascii	"                  \n\n"
tsclen:	.quad	. - tscmsg


	.section	.text
_start:	
	# read the TimeStamp Counter register
	rdtsc
	mov	%eax, tscval+0
	mov	%edx, tscval+4

	# format the register-value for output
	mov	tscval, %rax
	lea	tscbuf, %rdi
	mov	$10, %rbx
	xor	%rcx, %rcx
nxdiv:
	xor	%rdx, %rdx
	div	%rbx
	push	%rdx
	inc	%rcx
	or	%rax, %rax
	jnz	nxdiv
nxdgt:
	pop	%rdx
	add	$'0', %dl
	mov	%dl, (%rdi)
	inc	%rdi
	loop	nxdgt

	# write the report-message
	mov	$sys_WRITE, %rax
	mov	$dev_STDOUT, %rdi
	lea	tscmsg, %rsi
	mov	tsclen, %rdx
	syscall

	# terminate this program
	mov	$sys_EXIT, %rax
	xor	%rdi, %rdi
	syscall

	.global	_start
	.end