/*

getcpuflags_x86_64: get cpuflags for x86-64

copyright 1995-2013 by the mpg123 project - free software under the terms of the LGPL 2.1

see COPYING and AUTHORS files in distribution or http://mpg123.org

initially written by Taihei Monma

*/

#include "mangle.h"

.text

ALIGN4

.globl ASM_NAME(getcpuflags)

ASM_NAME(getcpuflags):

push %rbp

mov %rsp, %rbp

push %rbx

#ifdef IS_MSABI

push %rdi

mov %rcx, %rdi

#endif

movl $0, 12(%rdi)

movl $0, 16(%rdi)

mov $0x80000000, %eax

cpuid

cmp $0x80000001, %eax

jb 1f

mov $0x80000001, %eax

cpuid

movl %edx, 12(%rdi)

1:

mov $0x00000001, %eax

cpuid

movl %eax, (%rdi)

movl %ecx, 4(%rdi)

movl %edx, 8(%rdi)

test $0x04000000, %ecx

jz 2f

test $0x08000000, %ecx

jz 2f

xor %ecx, %ecx

.byte 0x0f, 0x01, 0xd0 /* xgetbv instruction */

movl %eax, 16(%rdi)

movl (%rdi), %eax

2:

#ifdef IS_MSABI

pop %rdi

#endif

pop %rbx

mov %rbp, %rsp

pop %rbp

ret

NONEXEC_STACK