source: mainline/kernel/arch/ia32/src/mm/frame.c@ ca62f86

/*
 * Copyright (c) 2008 Jakub Jermar
 * 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 ia32mm
 * @{
 */
/** @file
 * @ingroup ia32mm, amd64mm
 */

#include <mm/frame.h>
#include <arch/mm/frame.h>
#include <mm/as.h>
#include <config.h>
#include <arch/boot/boot.h>
#include <arch/boot/memmap.h>
#include <panic.h>
#include <debug.h>
#include <align.h>
#include <macros.h>
#include <print.h>

#define PHYSMEM_LIMIT32  UINT64_C(0x100000000)
#define PHYSMEM_LIMIT_DMA   UINT64_C(0x1000000)

size_t hardcoded_unmapped_ktext_size = 0;
size_t hardcoded_unmapped_kdata_size = 0;

static void init_e820_memory(pfn_t minconf, bool low)
{
        unsigned int i;
        
        for (i = 0; i < e820counter; i++) {
                uint64_t base64 = e820table[i].base_address;
                uint64_t size64 = e820table[i].size;
                
#ifdef KARCH_ia32
                /*
                 * Restrict the e820 table entries to 32-bits.
                 */
                if (base64 >= PHYSMEM_LIMIT32)
                        continue;
                
                if (base64 + size64 > PHYSMEM_LIMIT32)
                        size64 = PHYSMEM_LIMIT32 - base64;
#endif
                
                uintptr_t base = (uintptr_t) base64;
                size_t size = (size_t) size64;
                
                if (!frame_adjust_zone_bounds(low, &base, &size))
                        continue;
                
                if (e820table[i].type == MEMMAP_MEMORY_AVAILABLE) {
                        /* To be safe, make the available zone possibly smaller */
                        uint64_t new_base = ALIGN_UP(base, FRAME_SIZE);
                        uint64_t new_size = ALIGN_DOWN(size - (new_base - base),
                            FRAME_SIZE);
                        
                        size_t count = SIZE2FRAMES(new_size);
                        pfn_t pfn = ADDR2PFN(new_base);
                        pfn_t conf;
                        
                        if (low) {
                                if ((minconf < pfn) || (minconf >= pfn + count))
                                        conf = pfn;
                                else
                                        conf = minconf;

                                if ((pfn * PAGE_SIZE) < PHYSMEM_LIMIT_DMA) {
                                        size_t dma_count = min(
                                            PHYSMEM_LIMIT_DMA / PAGE_SIZE - pfn,
                                            count);
                                        zone_create(pfn, dma_count, conf,
                                            ZONE_AVAILABLE | ZONE_DMA);
                                        count -= dma_count;
                                        pfn += dma_count;
                                }

                                conf = pfn;
                                if (count) {
                                        zone_create(pfn, count, conf,
                                            ZONE_AVAILABLE | ZONE_LOWMEM);
                                }
                        } else {
                                conf = zone_external_conf_alloc(count);
                                if (conf != 0) {
                                        zone_create(pfn, count, conf,
                                            ZONE_AVAILABLE | ZONE_HIGHMEM);
                                }
                        }
                } else if ((e820table[i].type == MEMMAP_MEMORY_ACPI) ||
                    (e820table[i].type == MEMMAP_MEMORY_NVS)) {
                        /* To be safe, make the firmware zone possibly larger */
                        uint64_t new_base = ALIGN_DOWN(base, FRAME_SIZE);
                        uint64_t new_size = ALIGN_UP(size + (base - new_base),
                            FRAME_SIZE);
                        
                        zone_create(ADDR2PFN(new_base), SIZE2FRAMES(new_size), 0,
                            ZONE_FIRMWARE);
                } else {
                        /* To be safe, make the reserved zone possibly larger */
                        uint64_t new_base = ALIGN_DOWN(base, FRAME_SIZE);
                        uint64_t new_size = ALIGN_UP(size + (base - new_base),
                            FRAME_SIZE);
                        
                        zone_create(ADDR2PFN(new_base), SIZE2FRAMES(new_size), 0,
                            ZONE_RESERVED);
                }
        }
}

static const char *e820names[] = {
        "invalid",
        "available",
        "reserved",
        "acpi",
        "nvs",
        "unusable"
};

void physmem_print(void)
{
        unsigned int i;
        printf("[base            ] [size            ] [name   ]\n");
        
        for (i = 0; i < e820counter; i++) {
                const char *name;
                
                if (e820table[i].type <= MEMMAP_MEMORY_UNUSABLE)
                        name = e820names[e820table[i].type];
                else
                        name = "invalid";
                
                printf("%#018" PRIx64 " %#018" PRIx64" %s\n", e820table[i].base_address,
                    e820table[i].size, name);
        }
}


void frame_low_arch_init(void)
{
        pfn_t minconf;
        
        if (config.cpu_active == 1) {
                minconf = 1;
                
#ifdef CONFIG_SMP
                minconf = max(minconf,
                    ADDR2PFN(AP_BOOT_OFFSET + hardcoded_unmapped_ktext_size +
                    hardcoded_unmapped_kdata_size));
#endif
                
                init_e820_memory(minconf, true);
                
                /* Reserve frame 0 (BIOS data) */
                frame_mark_unavailable(0, 1);
                
#ifdef CONFIG_SMP
                /* Reserve AP real mode bootstrap memory */
                frame_mark_unavailable(AP_BOOT_OFFSET >> FRAME_WIDTH,
                    (hardcoded_unmapped_ktext_size +
                    hardcoded_unmapped_kdata_size) >> FRAME_WIDTH);
#endif
        }
}

void frame_high_arch_init(void)
{
        if (config.cpu_active == 1)
                init_e820_memory(0, false);
}

/** @}
 */