Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/*

 *  linux/arch/arm/mm/init.c

 *

 *  Copyright (C) 1995-2005 Russell King

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 */

#include <linux/kernel.h>

#include <linux/errno.h>

#include <linux/swap.h>

#include <linux/init.h>

#include <linux/bootmem.h>

#include <linux/mman.h>

#include <linux/nodemask.h>

#include <linux/initrd.h>

#include <asm/mach-types.h>

#include <asm/setup.h>

#include <asm/sizes.h>

#include <asm/tlb.h>

#include <asm/mach/arch.h>

#include <asm/mach/map.h>

#include "mm.h"

extern void _text, _etext, __data_start, _end, __init_begin, __init_end;

extern unsigned long phys_initrd_start;

extern unsigned long phys_initrd_size;

/*

 * This is used to pass memory configuration data from paging_init

 * to mem_init, and by show_mem() to skip holes in the memory map.

 */

static struct meminfo meminfo = { 0, };

#define for_each_nodebank(iter,mi,no)                   \

        for (iter = 0; iter < mi->nr_banks; iter++)      \

                if (mi->bank[iter].node == no)

void show_mem(void)

{

        int free = 0, total = 0, reserved = 0;

        int shared = 0, cached = 0, slab = 0, node, i;

        struct meminfo * mi = &meminfo;

        printk("Mem-info:\n");

        show_free_areas();

        printk("Free swap:       %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10));

        for_each_online_node(node) {

                pg_data_t *n = NODE_DATA(node);

                struct page *map = n->node_mem_map - n->node_start_pfn;

                for_each_nodebank (i,mi,node) {

                        unsigned int pfn1, pfn2;

                        struct page *page, *end;

                        pfn1 = __phys_to_pfn(mi->bank[i].start);

                        pfn2 = __phys_to_pfn(mi->bank[i].size + mi->bank[i].start);

                        page = map + pfn1;

                        end  = map + pfn2;

                        do {

                                total++;

                                if (PageReserved(page))

                                        reserved++;

                                else if (PageSwapCache(page))

                                        cached++;

                                else if (PageSlab(page))

                                        slab++;

                                else if (!page_count(page))

                                        free++;

                                else

                                        shared += page_count(page) - 1;

                                page++;

                        } while (page < end);

                }

        }

        printk("%d pages of RAM\n", total);

        printk("%d free pages\n", free);

        printk("%d reserved pages\n", reserved);

        printk("%d slab pages\n", slab);

        printk("%d pages shared\n", shared);

        printk("%d pages swap cached\n", cached);

}

/*

 * FIXME: We really want to avoid allocating the bootmap bitmap

 * over the top of the initrd.  Hopefully, this is located towards

 * the start of a bank, so if we allocate the bootmap bitmap at

 * the end, we won't clash.

 */

static unsigned int __init

find_bootmap_pfn(int node, struct meminfo *mi, unsigned int bootmap_pages)

{

        unsigned int start_pfn, bank, bootmap_pfn;

        start_pfn   = PAGE_ALIGN(__pa(&_end)) >> PAGE_SHIFT;

        bootmap_pfn = 0;

        for_each_nodebank(bank, mi, node) {

                unsigned int start, end;

                start = mi->bank[bank].start >> PAGE_SHIFT;

                end   = (mi->bank[bank].size +

                         mi->bank[bank].start) >> PAGE_SHIFT;

                if (end < start_pfn)

                        continue;

                if (start < start_pfn)

                        start = start_pfn;

                if (end <= start)

                        continue;

                if (end - start >= bootmap_pages) {

                        bootmap_pfn = start;

                        break;

                }

        }

        if (bootmap_pfn == 0)

                BUG();

        return bootmap_pfn;

}

static int __init check_initrd(struct meminfo *mi)

{

        int initrd_node = -2;

#ifdef CONFIG_BLK_DEV_INITRD

        unsigned long end = phys_initrd_start + phys_initrd_size;

        /*

         * Make sure that the initrd is within a valid area of

         * memory.

         */

        if (phys_initrd_size) {

                unsigned int i;

                initrd_node = -1;

                for (i = 0; i < mi->nr_banks; i++) {

                        unsigned long bank_end;

                        bank_end = mi->bank[i].start + mi->bank[i].size;

                        if (mi->bank[i].start <= phys_initrd_start &&

                            end <= bank_end)

                                initrd_node = mi->bank[i].node;

                }

        }

        if (initrd_node == -1) {

                printk(KERN_ERR "initrd (0x%08lx - 0x%08lx) extends beyond "

                       "physical memory - disabling initrd\n",

                       phys_initrd_start, end);

                phys_initrd_start = phys_initrd_size = 0;

        }

#endif

        return initrd_node;

}

static inline void map_memory_bank(struct membank *bank)

{

#ifdef CONFIG_MMU

        struct map_desc map;

        map.pfn = __phys_to_pfn(bank->start);

        map.virtual = __phys_to_virt(bank->start);

        map.length = bank->size;

        map.type = MT_MEMORY;

        create_mapping(&map);

#endif

}

static unsigned long __init

bootmem_init_node(int node, int initrd_node, struct meminfo *mi)

{

        unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];

        unsigned long start_pfn, end_pfn, boot_pfn;

        unsigned int boot_pages;

        pg_data_t *pgdat;

        int i;

        start_pfn = -1UL;

        end_pfn = 0;

        /*

         * Calculate the pfn range, and map the memory banks for this node.

         */

        for_each_nodebank(i, mi, node) {

                struct membank *bank = &mi->bank[i];

                unsigned long start, end;

                start = bank->start >> PAGE_SHIFT;

                end = (bank->start + bank->size) >> PAGE_SHIFT;

                if (start_pfn > start)

                        start_pfn = start;

                if (end_pfn < end)

                        end_pfn = end;

                map_memory_bank(bank);

        }

        /*

         * If there is no memory in this node, ignore it.

         */

        if (end_pfn == 0)

                return end_pfn;

        /*

         * Allocate the bootmem bitmap page.

         */

        boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn);

        boot_pfn = find_bootmap_pfn(node, mi, boot_pages);

        /*

         * Initialise the bootmem allocator for this node, handing the

         * memory banks over to bootmem.

         */

        node_set_online(node);

        pgdat = NODE_DATA(node);

        init_bootmem_node(pgdat, boot_pfn, start_pfn, end_pfn);

        for_each_nodebank(i, mi, node)

                free_bootmem_node(pgdat, mi->bank[i].start, mi->bank[i].size);

        /*

         * Reserve the bootmem bitmap for this node.

         */

        reserve_bootmem_node(pgdat, boot_pfn << PAGE_SHIFT,

                             boot_pages << PAGE_SHIFT);

#ifdef CONFIG_BLK_DEV_INITRD

        /*

         * If the initrd is in this node, reserve its memory.

         */

        if (node == initrd_node) {

                reserve_bootmem_node(pgdat, phys_initrd_start,

                                     phys_initrd_size);

                initrd_start = __phys_to_virt(phys_initrd_start);

                initrd_end = initrd_start + phys_initrd_size;

        }

#endif

        /*

         * Finally, reserve any node zero regions.

         */

        if (node == 0)

                reserve_node_zero(pgdat);

        /*

         * initialise the zones within this node.

         */

        memset(zone_size, 0, sizeof(zone_size));

        memset(zhole_size, 0, sizeof(zhole_size));

        /*

         * The size of this node has already been determined.  If we need

         * to do anything fancy with the allocation of this memory to the

         * zones, now is the time to do it.

         */

        zone_size[0] = end_pfn - start_pfn;

        /*

         * For each bank in this node, calculate the size of the holes.

         *  holes = node_size - sum(bank_sizes_in_node)

         */

        zhole_size[0] = zone_size[0];

        for_each_nodebank(i, mi, node)

                zhole_size[0] -= mi->bank[i].size >> PAGE_SHIFT;

        /*

         * Adjust the sizes according to any special requirements for

         * this machine type.

         */

        arch_adjust_zones(node, zone_size, zhole_size);

        free_area_init_node(node, pgdat, zone_size, start_pfn, zhole_size);

        return end_pfn;

}

void __init bootmem_init(struct meminfo *mi)

{

        unsigned long memend_pfn = 0;

        int node, initrd_node, i;

        /*

         * Invalidate the node number for empty or invalid memory banks

         */

        for (i = 0; i < mi->nr_banks; i++)

                if (mi->bank[i].size == 0 || mi->bank[i].node >= MAX_NUMNODES)

                        mi->bank[i].node = -1;

        memcpy(&meminfo, mi, sizeof(meminfo));

        /*

         * Locate which node contains the ramdisk image, if any.

         */

        initrd_node = check_initrd(mi);

        /*

         * Run through each node initialising the bootmem allocator.

         */

        for_each_node(node) {

                unsigned long end_pfn;

                end_pfn = bootmem_init_node(node, initrd_node, mi);

                /*

                 * Remember the highest memory PFN.

                 */

                if (end_pfn > memend_pfn)

                        memend_pfn = end_pfn;

        }

        high_memory = __va(memend_pfn << PAGE_SHIFT);

        /*

         * This doesn't seem to be used by the Linux memory manager any

         * more, but is used by ll_rw_block.  If we can get rid of it, we

         * also get rid of some of the stuff above as well.

         *

         * Note: max_low_pfn and max_pfn reflect the number of _pages_ in

         * the system, not the maximum PFN.

         */

        max_pfn = max_low_pfn = memend_pfn - PHYS_PFN_OFFSET;

}

static inline void free_area(unsigned long addr, unsigned long end, char *s)

{

        unsigned int size = (end - addr) >> 10;

        for (; addr < end; addr += PAGE_SIZE) {

                struct page *page = virt_to_page(addr);

                ClearPageReserved(page);

                init_page_count(page);

                free_page(addr);

                totalram_pages++;

        }

        if (size && s)

                printk(KERN_INFO "Freeing %s memory: %dK\n", s, size);

}

static inline void

free_memmap(int node, unsigned long start_pfn, unsigned long end_pfn)

{

        struct page *start_pg, *end_pg;

        unsigned long pg, pgend;

        /*

         * Convert start_pfn/end_pfn to a struct page pointer.

         */

        start_pg = pfn_to_page(start_pfn);

        end_pg = pfn_to_page(end_pfn);

        /*

         * Convert to physical addresses, and

         * round start upwards and end downwards.

         */

        pg = PAGE_ALIGN(__pa(start_pg));

        pgend = __pa(end_pg) & PAGE_MASK;

        /*

         * If there are free pages between these,

         * free the section of the memmap array.

         */

        if (pg < pgend)

                free_bootmem_node(NODE_DATA(node), pg, pgend - pg);

}

/*

 * The mem_map array can get very big.  Free the unused area of the memory map.

 */

static void __init free_unused_memmap_node(int node, struct meminfo *mi)

{

        unsigned long bank_start, prev_bank_end = 0;

        unsigned int i;

        /*

         * [FIXME] This relies on each bank being in address order.  This

         * may not be the case, especially if the user has provided the

         * information on the command line.

         */

        for_each_nodebank(i, mi, node) {

                bank_start = mi->bank[i].start >> PAGE_SHIFT;

                if (bank_start < prev_bank_end) {

                        printk(KERN_ERR "MEM: unordered memory banks.  "

                                "Not freeing memmap.\n");

                        break;

                }

                /*

                 * If we had a previous bank, and there is a space

                 * between the current bank and the previous, free it.

                 */

                if (prev_bank_end && prev_bank_end != bank_start)

                        free_memmap(node, prev_bank_end, bank_start);

                prev_bank_end = (mi->bank[i].start +

                                 mi->bank[i].size) >> PAGE_SHIFT;

        }

}

/*

 * mem_init() marks the free areas in the mem_map and tells us how much

 * memory is free.  This is done after various parts of the system have

 * claimed their memory after the kernel image.

 */

void __init mem_init(void)

{

        unsigned int codepages, datapages, initpages;

        int i, node;

        codepages = &_etext - &_text;

        datapages = &_end - &__data_start;

        initpages = &__init_end - &__init_begin;

#ifndef CONFIG_DISCONTIGMEM

        max_mapnr   = virt_to_page(high_memory) - mem_map;

#endif

        /* this will put all unused low memory onto the freelists */

        for_each_online_node(node) {

                pg_data_t *pgdat = NODE_DATA(node);

                free_unused_memmap_node(node, &meminfo);

                if (pgdat->node_spanned_pages != 0)

                        totalram_pages += free_all_bootmem_node(pgdat);

        }

#ifdef CONFIG_SA1111

        /* now that our DMA memory is actually so designated, we can free it */

        free_area(PAGE_OFFSET, (unsigned long)swapper_pg_dir, NULL);

#endif

        /*

         * Since our memory may not be contiguous, calculate the

         * real number of pages we have in this system

         */

        printk(KERN_INFO "Memory:");

        num_physpages = 0;

        for (i = 0; i < meminfo.nr_banks; i++) {

                num_physpages += meminfo.bank[i].size >> PAGE_SHIFT;

                printk(" %ldMB", meminfo.bank[i].size >> 20);

        }

        printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT));

        printk(KERN_NOTICE "Memory: %luKB available (%dK code, "

                "%dK data, %dK init)\n",

                (unsigned long) nr_free_pages() << (PAGE_SHIFT-10),

                codepages >> 10, datapages >> 10, initpages >> 10);

        if (PAGE_SIZE >= 16384 && num_physpages <= 128) {

                extern int sysctl_overcommit_memory;

                /*

                 * On a machine this small we won't get

                 * anywhere without overcommit, so turn

                 * it on by default.

                 */

                sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;

        }

}

void free_initmem(void)

{

        if (!machine_is_integrator() && !machine_is_cintegrator()) {

                free_area((unsigned long)(&__init_begin),

                          (unsigned long)(&__init_end),

                          "init");

        }

}

#ifdef CONFIG_BLK_DEV_INITRD

static int keep_initrd;

void free_initrd_mem(unsigned long start, unsigned long end)

{

        if (!keep_initrd)

                free_area(start, end, "initrd");

}

static int __init keepinitrd_setup(char *__unused)

{

        keep_initrd = 1;

        return 1;

}

__setup("keepinitrd", keepinitrd_setup);

#endif