source: mainline/kernel/arch/arm64/src/mm/frame.c@ 84176f3

/*
 * 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 Frame related functions.
 */

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

/** Physical memory map received from the bootcode. */
memmap_t memmap;

/** Print memory layout. */
void physmem_print(void)
{
        printf("[base            ] [size            ] [type      ]\n");

        size_t i;
        for (i = 0; i < memmap.cnt; i++) {
                const char *type;
                switch (memmap.zones[i].type) {
                case MEMTYPE_AVAILABLE:
                        type = "available";
                        break;
                case MEMTYPE_ACPI_RECLAIM:
                        type = "ACPI reclaim";
                        break;
                default:
                        type = "unusable";
                        break;
                }

                printf("%p %#018zx %s\n", memmap.zones[i].start,
                    memmap.zones[i].size, type);
        }
}

/** Create memory zones according to information stored in memmap.
 *
 * Walk the memory map and create frame zones according to it.
 */
static void frame_common_arch_init(bool low)
{
        size_t i;

        for (i = 0; i < memmap.cnt; i++) {
                if (memmap.zones[i].type != MEMTYPE_AVAILABLE)
                        continue;

                /* To be safe, make the available zone possibly smaller. */
                uintptr_t base = ALIGN_UP((uintptr_t) memmap.zones[i].start,
                    FRAME_SIZE);
                size_t size = ALIGN_DOWN(memmap.zones[i].size -
                    (base - (uintptr_t) memmap.zones[i].start), FRAME_SIZE);

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

                pfn_t confdata;
                pfn_t pfn = ADDR2PFN(base);
                size_t count = SIZE2FRAMES(size);

                if (low) {
                        /* Determine where to place confdata. */
                        if (pfn == 0) {
                                /*
                                 * Avoid placing confdata at the NULL address.
                                 */
                                if (count == 1)
                                        continue;
                                confdata = 1;
                        } else
                                confdata = pfn;

                        zone_create(pfn, count, confdata,
                            ZONE_AVAILABLE | ZONE_LOWMEM);
                } else {
                        confdata = zone_external_conf_alloc(count);
                        if (confdata != 0)
                                zone_create(pfn, count, confdata,
                                    ZONE_AVAILABLE | ZONE_HIGHMEM);
                }
        }
}

/** Create low memory zones. */
void frame_low_arch_init(void)
{
        if (config.cpu_active > 1)
                return;

        frame_common_arch_init(true);

        /*
         * On ARM64, physical memory can start on a non-zero address. The
         * generic frame_init() only marks PFN 0 as not free, so we must mark
         * the physically first frame not free explicitly here, no matter what
         * is its address.
         */
        frame_mark_unavailable(ADDR2PFN(physmem_base), 1);
}

/** Create high memory zones. */
void frame_high_arch_init(void)
{
        if (config.cpu_active > 1)
                return;

        frame_common_arch_init(false);
}

/** @}
 */