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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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# 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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.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 rdtsc
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## Determine CPUID support
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## Determine CPUID support
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#
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#
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# Return 0 in EAX if CPUID is not support, 1 if supported.
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# Return 0 in EAX if CPUID is not supported, 1 if supported.
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#
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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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	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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	movl %eax,%ebx		# copy flags
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	movl %eax,%edx		# copy flags
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	btcl $21,%ebx		# swap the ID bit
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	btcl $21,%edx		# swap the ID bit
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	pushl %ebx
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	pushl %edx
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	popf			# propagate the change into flags
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	popf			# propagate the change into flags
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	pushf
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	pushf
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	popl %ebx		# read flags
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	popl %edx		# read flags
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	andl $(1<<21),%eax	# interested only in ID bit
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	andl $(1<<21),%eax	# interested only in ID bit
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	andl $(1<<21),%ebx
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	andl $(1<<21),%edx
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	xorl %ebx,%eax		# 0 if not supported, 1 if supported
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	xorl %edx,%eax		# 0 if not supported, 1 if supported
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	pop %ebx
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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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#   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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	pushl %ebp
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	movl %esp,%ebp
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	pusha
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	movl 8(%ebp),%eax	# load the command into %eax
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	movl 12(%ebp),%esi	# laod the address of the info struct
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	cpuid
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	movl %eax,0(%esi)
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	movl %ebx,4(%esi)
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	movl %ecx,8(%esi)
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	movl %edx,12(%esi)
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	popa
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	popl %ebp
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	ret
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rdtsc:
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	rdtsc
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	ret
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	ret