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  Copyright (c) 2018, Intel Corporation

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  modification, are permitted provided that the following conditions are met:

      * Redistributions of source code must retain the above copyright notice,
        this list of conditions and the following disclaimer.
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        notice, this list of conditions and the following disclaimer in the
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        may be used to endorse or promote products derived from this software
        without specific prior written permission.

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  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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#include <stdint.h>
#ifdef LINUX
#include <stdlib.h> /* posix_memalign() and free() */
#else
#include <malloc.h> /* _aligned_malloc() and aligned_free() */
#endif
#include "intel-ipsec-mb.h"
#include "cpu_feature.h"

/**
 * @brief Allocates memory for multi-buffer manager instance
 *
 * For binary compatibility between library versions
 * it is recommended to use this API.
 *
 * @param flags multi-buffer manager flags
 *     IMB_FLAG_SHANI_OFF - disable use (and detection) of SHA extenstions,
 *                          currently SHANI is only available for SSE
 *
 * @return Pointer to allocated memory for MB_MGR structure
 * @retval NULL on allocation error
 */
MB_MGR *alloc_mb_mgr(uint64_t flags)
{
        const size_t alignment = 64;
        const size_t size = sizeof(MB_MGR);
        MB_MGR *ptr = NULL;

#ifdef LINUX
        if (posix_memalign((void **)&ptr, alignment, size))
                return NULL;
#else
        ptr = _aligned_malloc(size, alignment);
#endif
        if (ptr != NULL) {
                ptr->flags = flags; /* save the flags for future use in init */
                ptr->features = cpu_feature_adjust(flags, cpu_feature_detect());
        }
        IMB_ASSERT(ptr != NULL);
        return ptr;
}

/**
 * @brief Frees memory allocated previously by alloc_mb_mgr()
 *
 * @param ptr a pointer to allocated MB_MGR structure
 *
 */
void free_mb_mgr(MB_MGR *ptr)
{
        IMB_ASSERT(ptr != NULL);
#ifdef LINUX
        free(ptr);
#else
        _aligned_free(ptr);
#endif
}