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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#
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#
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#
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# CPU identification functions.
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# The code below just interfaces the CPUID instruction.
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# The code below just interfaces the CPUID instruction.
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# CPU recognition logic is contained in higher-level functions.
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# CPU recognition logic is contained in higher-level functions.
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.text
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.text
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.global has_cpuid
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.global has_cpuid
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.global cpuid
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.global cpuid
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.global rdtsc
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.global rdtsc
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## Determine CPUID support
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#
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# Return 0 in EAX if CPUID is not support, 1 if supported.
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#
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has_cpuid:
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has_cpuid:
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	push %ebx
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	push %ebx
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	pushf			# store flags
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	pushf			# store flags
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	popl %eax		# read flags
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	popl %eax		# read flags
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	xorl %ebx,%eax		# 0 if not supported, 1 if supported
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	xorl %ebx,%eax		# 0 if not supported, 1 if supported
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	pop %ebx
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	pop %ebx
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	ret
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	ret
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## Get CPUID data
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#
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# This code is just an interfaces the CPUID instruction, CPU recognition
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# logic is contained in higher-level functions.
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#
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# The C prototype is:
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# cpuid(__u32 cmd, struct cpu_info *info)
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#   void cpuid(__u32 cmd, struct cpu_info *info)
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#
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# @param cmd  CPUID command.
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# @param info Buffer to store CPUID output.
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#
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cpuid:
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cpuid:
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	pushl %ebp
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	pushl %ebp
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	movl %esp,%ebp
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	movl %esp,%ebp
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	pusha
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	pusha
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