source: mainline/kernel/arch/arm32/src/mm/frame.c

/*
 * Copyright (c) 2007 Pavel Jancik, Michal Kebrt
 * 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 kernel_arm32_mm
 * @{
 */
/** @file
 *  @brief Frame related functions.
 */

#include <mm/frame.h>
#include <arch/mm/frame.h>
#include <arch/machine_func.h>
#include <config.h>
#include <align.h>
#include <macros.h>

static void frame_common_arch_init(bool low)
{
        uintptr_t base;
        size_t size;

        machine_get_memory_extents(&base, &size);
        base = ALIGN_UP(base, FRAME_SIZE);
        size = ALIGN_DOWN(size, FRAME_SIZE);

        if (!frame_adjust_zone_bounds(low, &base, &size))
                return;

        if (low) {
                zone_create(ADDR2PFN(base), SIZE2FRAMES(size),
                    BOOT_PAGE_TABLE_START_FRAME +
                    BOOT_PAGE_TABLE_SIZE_IN_FRAMES,
                    ZONE_AVAILABLE | ZONE_LOWMEM);
        } else {
                pfn_t conf = zone_external_conf_alloc(SIZE2FRAMES(size));
                if (conf != 0)
                        zone_create(ADDR2PFN(base), SIZE2FRAMES(size), conf,
                            ZONE_AVAILABLE | ZONE_HIGHMEM);
        }

}

/** Create low memory zones. */
void frame_low_arch_init(void)
{
        frame_common_arch_init(true);

        /* blacklist boot page table */
        frame_mark_unavailable(BOOT_PAGE_TABLE_START_FRAME,
            BOOT_PAGE_TABLE_SIZE_IN_FRAMES);

        machine_frame_init();
}

/** Create high memory zones. */
void frame_high_arch_init(void)
{
        frame_common_arch_init(false);
}

/** Frees the boot page table. */
void boot_page_table_free(void)
{
        frame_free(BOOT_PAGE_TABLE_ADDRESS,
            BOOT_PAGE_TABLE_SIZE_IN_FRAMES);
}

/** @}
 */