source: mainline/uspace/drv/uhci-hcd/utils/malloc32.h@ c61338a

/*
 * Copyright (c) 2010 Jan Vesely
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * 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.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
/** @addtogroup usb
 * @{
 */
/** @file
 * @brief UHCI driver
 */
#ifndef DRV_UHCI_TRANSLATOR_H
#define DRV_UHCI_TRANSLATOR_H

#include <assert.h>
#include <malloc.h>
#include <mem.h>
#include <as.h>

#define UHCI_STRCUTURES_ALIGNMENT 16
#define UHCI_REQUIRED_PAGE_SIZE 4096

/** Get physical address translation
 *
 * @param[in] addr Virtual address to translate
 * @return Physical address if exists, NULL otherwise.
 */
static inline uintptr_t addr_to_phys(void *addr)
{
        if (addr == NULL)
                return 0;

        uintptr_t result;
        int ret = as_get_physical_mapping(addr, &result);

        if (ret != EOK)
                return 0;
        return (result | ((uintptr_t)addr & 0xfff));
}
/*----------------------------------------------------------------------------*/
/** Physical mallocator simulator
 *
 * @param[in] size Size of the required memory space
 * @return Address of the alligned and big enough memory place, NULL on failure.
 */
static inline void * malloc32(size_t size)
        { return memalign(UHCI_STRCUTURES_ALIGNMENT, size); }
/*----------------------------------------------------------------------------*/
/** Physical mallocator simulator
 *
 * @param[in] addr Address of the place allocated by malloc32
 */
static inline void free32(void *addr)
        { if (addr) free(addr); }
/*----------------------------------------------------------------------------*/
/** Create 4KB page mapping
 *
 * @return Address of the mapped page, NULL on failure.
 */
static inline void * get_page(void)
{
        void * free_address = as_get_mappable_page(UHCI_REQUIRED_PAGE_SIZE);
        assert(free_address);
        if (free_address == 0)
                return NULL;
        void* ret =
          as_area_create(free_address, UHCI_REQUIRED_PAGE_SIZE,
                  AS_AREA_READ | AS_AREA_WRITE);
        if (ret != free_address)
                return NULL;
        return ret;
}

#endif
/**
 * @}
 */