init.c

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/*
 *  linux/arch/cris/mm/init.c
 *
 *  Copyright (C) 1995  Linus Torvalds
 *  Copyright (C) 2000,2001  Axis Communications AB
 *
 *  Authors:  Bjorn Wesen ([email protected])
 *
 */

#include <linux/gfp.h>
#include <linux/init.h>
#include <linux/bootmem.h>
#include <asm/tlb.h>

unsigned long empty_zero_page;

extern char _stext, _edata, _etext; /* From linkerscript */
extern char __init_begin, __init_end;

void __init
mem_init(void)
{
    int codesize, reservedpages, datasize, initsize;
    unsigned long tmp;

    BUG_ON(!mem_map);

    /* max/min_low_pfn was set by setup.c
     * now we just copy it to some other necessary places...
     *
     * high_memory was also set in setup.c
     */

    max_mapnr = num_physpages = max_low_pfn - min_low_pfn;
 
    /* this will put all memory onto the freelists */
        totalram_pages = free_all_bootmem();

    reservedpages = 0;
    for (tmp = 0; tmp < max_mapnr; tmp++) {
        /*
                 * Only count reserved RAM pages
                 */
        if (PageReserved(mem_map + tmp))
            reservedpages++;
    }

    codesize =  (unsigned long) &_etext - (unsigned long) &_stext;
        datasize =  (unsigned long) &_edata - (unsigned long) &_etext;
        initsize =  (unsigned long) &__init_end - (unsigned long) &__init_begin;
    
        printk(KERN_INFO
               "Memory: %luk/%luk available (%dk kernel code, %dk reserved, %dk data, "
           "%dk init)\n" ,
           nr_free_pages() << (PAGE_SHIFT-10),
           max_mapnr << (PAGE_SHIFT-10),
           codesize >> 10,
           reservedpages << (PAGE_SHIFT-10),
           datasize >> 10,
           initsize >> 10
               );
}

/* free the pages occupied by initialization code */

void 
free_initmem(void)
{
        unsigned long addr;

        addr = (unsigned long)(&__init_begin);
        for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
                ClearPageReserved(virt_to_page(addr));
                init_page_count(virt_to_page(addr));
                free_page(addr);
                totalram_pages++;
        }
        printk (KERN_INFO "Freeing unused kernel memory: %luk freed\n",
        (unsigned long)((&__init_end - &__init_begin) >> 10));
}