source: mainline/kernel/arch/ia32/src/mm/frame.c@ 720db0c

/*
 * 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_LIMIT  0x7C000000ull

size_t hardcoded_unmapped_ktext_size = 0;
size_t hardcoded_unmapped_kdata_size = 0;

uintptr_t last_frame = 0;

static void init_e820_memory(pfn_t minconf)
{
        unsigned int i;
        
        for (i = 0; i < e820counter; i++) {
                uint64_t base = e820table[i].base_address;
                uint64_t size = e820table[i].size;
                
#ifdef __32_BITS__
                /*
                 * XXX FIXME:
                 *
                 * Ignore zones which start above PHYSMEM_LIMIT
                 * or clip zones which go beyond PHYSMEM_LIMIT.
                 *
                 * The PHYSMEM_LIMIT (2 GB - 64 MB) is a rather
                 * arbitrary constant which allows to have at
                 * least 64 MB in the kernel address space to
                 * map hardware resources.
                 *
                 * The kernel uses fixed 1:1 identity mapping
                 * of the physical memory with 2:2 GB split.
                 * This is a severe limitation of the current
                 * kernel memory management.
                 *
                 */
                
                if (base > PHYSMEM_LIMIT)
                        continue;
                
                if (base + size > PHYSMEM_LIMIT)
                        size = PHYSMEM_LIMIT - base;
#endif
                
                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);
                        
                        pfn_t pfn = ADDR2PFN(new_base);
                        size_t count = SIZE2FRAMES(new_size);
                        
                        pfn_t conf;
                        if ((minconf < pfn) || (minconf >= pfn + count))
                                conf = pfn;
                        else
                                conf = minconf;
                        
                        zone_create(pfn, count, conf, ZONE_AVAILABLE);
                        
                        // XXX this has to be removed
                        if (last_frame < ALIGN_UP(new_base + new_size, FRAME_SIZE))
                                last_frame = ALIGN_UP(new_base + new_size, FRAME_SIZE);
                }
                
                if (e820table[i].type == MEMMAP_MEMORY_RESERVED) {
                        /* 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);
                }
                
                if (e820table[i].type == MEMMAP_MEMORY_ACPI) {
                        /* 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);
                }
        }
}

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

void physmem_print(void)
{
        unsigned int i;
        const char *name;
        
        printf("[base            ] [size            ] [name\n");
                
        for (i = 0; i < e820counter; i++) {
                if (e820table[i].type <= MEMMAP_MEMORY_UNUSABLE)
                        name = e820names[e820table[i].type];
                else
                        name = "invalid";
                
                printf("%#18llx %#18llx %s\n", e820table[i].base_address,
                    e820table[i].size, name);
        }
}


void frame_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);
                
                /* 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
        }
}

/** @}
 */