tscread.s

来自「一款类linux的操作系统源码」· S 代码 · 共 22 行

	.file		"tsc.s"
	.text

	.globl		tscread
tscread:
	pushl		%ebp
	movl		%esp, %ebp

	movl		8(%ebp), %edi

	/* Opcode for reading Pentium timestamp counter */
	.byte		0x0f
	.byte		0x31

	movl		%edx, (%edi)
	addl		$4, %edi
	movl		%eax, (%edi)

	leave
	ret
	.align		2, 0x90