init_mm.c

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/*
 *  linux/arch/m68k/mm/init.c
 *
 *  Copyright (C) 1995  Hamish Macdonald
 *
 *  Contains common initialization routines, specific init code moved
 *  to motorola.c and sun3mmu.c
 */

#include <linux/module.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/swap.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/bootmem.h>
#include <linux/gfp.h>

#include <asm/setup.h>
#include <asm/uaccess.h>
#include <asm/page.h>
#include <asm/pgalloc.h>
#include <asm/traps.h>
#include <asm/machdep.h>
#include <asm/io.h>
#ifdef CONFIG_ATARI
#include <asm/atari_stram.h>
#endif
#include <asm/sections.h>
#include <asm/tlb.h>

pg_data_t pg_data_map[MAX_NUMNODES];
EXPORT_SYMBOL(pg_data_map);

int m68k_virt_to_node_shift;

#ifndef CONFIG_SINGLE_MEMORY_CHUNK
pg_data_t *pg_data_table[65];
EXPORT_SYMBOL(pg_data_table);
#endif

void __init m68k_setup_node(int node)
{
#ifndef CONFIG_SINGLE_MEMORY_CHUNK
    struct mem_info *info = m68k_memory + node;
    int i, end;

    i = (unsigned long)phys_to_virt(info->addr) >> __virt_to_node_shift();
    end = (unsigned long)phys_to_virt(info->addr + info->size - 1) >> __virt_to_node_shift();
    for (; i <= end; i++) {
        if (pg_data_table[i])
            printk("overlap at %u for chunk %u\n", i, node);
        pg_data_table[i] = pg_data_map + node;
    }
#endif
    pg_data_map[node].bdata = bootmem_node_data + node;
    node_set_online(node);
}


/*
 * ZERO_PAGE is a special page that is used for zero-initialized
 * data and COW.
 */

void *empty_zero_page;
EXPORT_SYMBOL(empty_zero_page);

extern void init_pointer_table(unsigned long ptable);

/* References to section boundaries */

extern pmd_t *zero_pgtable;

#if defined(CONFIG_MMU) && !defined(CONFIG_COLDFIRE)
#define VECTORS &vectors[0]
#else
#define VECTORS _ramvec
#endif

void __init print_memmap(void)
{
#define UL(x) ((unsigned long) (x))
#define MLK(b, t) UL(b), UL(t), (UL(t) - UL(b)) >> 10
#define MLM(b, t) UL(b), UL(t), (UL(t) - UL(b)) >> 20
#define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), 1024)

    pr_notice("Virtual kernel memory layout:\n"
        "    vector  : 0x%08lx - 0x%08lx   (%4ld KiB)\n"
        "    kmap    : 0x%08lx - 0x%08lx   (%4ld MiB)\n"
        "    vmalloc : 0x%08lx - 0x%08lx   (%4ld MiB)\n"
        "    lowmem  : 0x%08lx - 0x%08lx   (%4ld MiB)\n"
        "      .init : 0x%p" " - 0x%p" "   (%4d KiB)\n"
        "      .text : 0x%p" " - 0x%p" "   (%4d KiB)\n"
        "      .data : 0x%p" " - 0x%p" "   (%4d KiB)\n"
        "      .bss  : 0x%p" " - 0x%p" "   (%4d KiB)\n",
        MLK(VECTORS, VECTORS + 256),
        MLM(KMAP_START, KMAP_END),
        MLM(VMALLOC_START, VMALLOC_END),
        MLM(PAGE_OFFSET, (unsigned long)high_memory),
        MLK_ROUNDUP(__init_begin, __init_end),
        MLK_ROUNDUP(_stext, _etext),
        MLK_ROUNDUP(_sdata, _edata),
        MLK_ROUNDUP(__bss_start, __bss_stop));
}

void __init mem_init(void)
{
    pg_data_t *pgdat;
    int codepages = 0;
    int datapages = 0;
    int initpages = 0;
    int i;

    /* this will put all memory onto the freelists */
    totalram_pages = num_physpages = 0;
    for_each_online_pgdat(pgdat) {
        num_physpages += pgdat->node_present_pages;

        totalram_pages += free_all_bootmem_node(pgdat);
        for (i = 0; i < pgdat->node_spanned_pages; i++) {
            struct page *page = pgdat->node_mem_map + i;
            char *addr = page_to_virt(page);

            if (!PageReserved(page))
                continue;
            if (addr >= _text &&
                addr < _etext)
                codepages++;
            else if (addr >= __init_begin &&
                 addr < __init_end)
                initpages++;
            else
                datapages++;
        }
    }

#if !defined(CONFIG_SUN3) && !defined(CONFIG_COLDFIRE)
    /* insert pointer tables allocated so far into the tablelist */
    init_pointer_table((unsigned long)kernel_pg_dir);
    for (i = 0; i < PTRS_PER_PGD; i++) {
        if (pgd_present(kernel_pg_dir[i]))
            init_pointer_table(__pgd_page(kernel_pg_dir[i]));
    }

    /* insert also pointer table that we used to unmap the zero page */
    if (zero_pgtable)
        init_pointer_table((unsigned long)zero_pgtable);
#endif

    printk("Memory: %luk/%luk available (%dk kernel code, %dk data, %dk init)\n",
           nr_free_pages() << (PAGE_SHIFT-10),
           totalram_pages << (PAGE_SHIFT-10),
           codepages << (PAGE_SHIFT-10),
           datapages << (PAGE_SHIFT-10),
           initpages << (PAGE_SHIFT-10));
    print_memmap();
}

#ifdef CONFIG_BLK_DEV_INITRD
void free_initrd_mem(unsigned long start, unsigned long end)
{
    int pages = 0;
    for (; start < end; start += PAGE_SIZE) {
        ClearPageReserved(virt_to_page(start));
        init_page_count(virt_to_page(start));
        free_page(start);
        totalram_pages++;
        pages++;
    }
    printk ("Freeing initrd memory: %dk freed\n", pages);
}
#endif