HelenOS sources

root/kernel/arch/arm64/src/mm/page.c

DEFINITIONS

1. page_arch_init

/*
 * Copyright (c) 2015 Petr Pavlu
 * 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_arm64_mm
 * @{
 */
/** @file
 * @brief Paging related functions.
 */

#include <arch/mm/page.h>
#include <genarch/mm/page_pt.h>
#include <mm/as.h>
#include <mm/page.h>

/** Initializes page tables. */
void page_arch_init(void)
{
        if (config.cpu_active > 1) {
                as_switch(NULL, AS_KERNEL);
                return;
        }

        page_mapping_operations = &pt_mapping_operations;

        page_table_lock(AS_KERNEL, true);

        /* PA2KA(identity) mapping for all low-memory frames. */
        for (uintptr_t cur = 0; cur < config.identity_size; cur += FRAME_SIZE) {
                uintptr_t addr = physmem_base + cur;
                page_mapping_insert(AS_KERNEL, PA2KA(addr), addr,
                    PAGE_GLOBAL | PAGE_CACHEABLE | PAGE_EXEC | PAGE_WRITE |
                    PAGE_READ);
        }

        page_table_unlock(AS_KERNEL, true);

        as_switch(NULL, AS_KERNEL);
}

/** @}
 */