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/*
* cpuid.c: check CPU capabilities
*
* Written in 2013 by Sebastian Ramacher <sebastian@ramacher.at>
*
* ===================================================================
* The contents of this file are dedicated to the public domain. To
* the extent that dedication to the public domain is not available,
* everyone is granted a worldwide, perpetual, royalty-free,
* non-exclusive license to exercise all rights associated with the
* contents of this file for any purpose whatsoever.
* No rights are reserved.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
* ===================================================================
*/
#include "Python.h"
#include <stdint.h>
#include "config.h"
#ifdef HAVE_CPUID_H
#include <cpuid.h>
#endif
#include "pycrypto_compat.h"
/*
* The have_aes_ni Python function
*/
static char have_aes_ni__doc__[] =
"have_aes_ni() -> bool\n"
"\n"
"Return whether AES-NI instructions are available.\n";
static PyObject *
have_aes_ni(PyObject *self, PyObject *args)
{
if (!PyArg_ParseTuple(args, ""))
return NULL;
#ifndef HAVE_CPUID_H
Py_INCREF(Py_False);
return Py_False;
#else
uint32_t eax, ebx, ecx, edx;
/* call cpuid to check if AES-NI instructions are available */
if (__get_cpuid(1, &eax, &ebx, &ecx, &edx)) {
if (ecx & bit_AES) {
Py_INCREF(Py_True);
return Py_True;
}
}
Py_INCREF(Py_False);
return Py_False;
#endif
}
/*
* Module-level method table and module initialization function
*/
static PyMethodDef cpuid_methods[] = {
{"have_aes_ni", have_aes_ni, METH_VARARGS, have_aes_ni__doc__},
{NULL, NULL, 0, NULL} /* end-of-list sentinel value */
};
#ifdef IS_PY3K
static struct PyModuleDef moduledef = {
PyModuleDef_HEAD_INIT,
"cpuid",
NULL,
-1,
cpuid_methods,
NULL,
NULL,
NULL,
NULL
};
#endif
PyMODINIT_FUNC
#ifdef IS_PY3K
PyInit_cpuid(void)
#else
initcpuid(void)
#endif
{
/* Initialize the module */
#ifdef IS_PY3K
return PyModule_Create(&moduledef);
#else
Py_InitModule("cpuid", cpuid_methods);
#endif
}
/* vim:set ts=4 sw=4 sts=4 expandtab: */
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