init.c

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/*
 *  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/export.h>
#include <linux/nodemask.h>
#include <linux/initrd.h>
#include <linux/of_fdt.h>
#include <linux/highmem.h>
#include <linux/gfp.h>
#include <linux/memblock.h>
#include <linux/dma-contiguous.h>
#include <linux/sizes.h>

#include <asm/mach-types.h>
#include <asm/memblock.h>
#include <asm/prom.h>
#include <asm/sections.h>
#include <asm/setup.h>
#include <asm/tlb.h>
#include <asm/fixmap.h>

#include <asm/mach/arch.h>
#include <asm/mach/map.h>

#include "mm.h"

static unsigned long phys_initrd_start __initdata = 0;
static unsigned long phys_initrd_size __initdata = 0;

static int __init early_initrd(char *p)
{
    unsigned long start, size;
    char *endp;

    start = memparse(p, &endp);
    if (*endp == ',') {
        size = memparse(endp + 1, NULL);

        phys_initrd_start = start;
        phys_initrd_size = size;
    }
    return 0;
}
early_param("initrd", early_initrd);

static int __init parse_tag_initrd(const struct tag *tag)
{
    printk(KERN_WARNING "ATAG_INITRD is deprecated; "
        "please update your bootloader.\n");
    phys_initrd_start = __virt_to_phys(tag->u.initrd.start);
    phys_initrd_size = tag->u.initrd.size;
    return 0;
}

__tagtable(ATAG_INITRD, parse_tag_initrd);

static int __init parse_tag_initrd2(const struct tag *tag)
{
    phys_initrd_start = tag->u.initrd.start;
    phys_initrd_size = tag->u.initrd.size;
    return 0;
}

__tagtable(ATAG_INITRD2, parse_tag_initrd2);

#ifdef CONFIG_OF_FLATTREE
void __init early_init_dt_setup_initrd_arch(unsigned long start, unsigned long end)
{
    phys_initrd_start = start;
    phys_initrd_size = end - start;
}
#endif /* CONFIG_OF_FLATTREE */

/*
 * This keeps memory configuration data used by a couple memory
 * initialization functions, as well as show_mem() for the skipping
 * of holes in the memory map.  It is populated by arm_add_memory().
 */
struct meminfo meminfo;

void show_mem(unsigned int filter)
{
    int free = 0, total = 0, reserved = 0;
    int shared = 0, cached = 0, slab = 0, i;
    struct meminfo * mi = &meminfo;

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

    for_each_bank (i, mi) {
        struct membank *bank = &mi->bank[i];
        unsigned int pfn1, pfn2;
        struct page *page, *end;

        pfn1 = bank_pfn_start(bank);
        pfn2 = bank_pfn_end(bank);

        page = pfn_to_page(pfn1);
        end  = pfn_to_page(pfn2 - 1) + 1;

        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);
}

static void __init find_limits(unsigned long *min, unsigned long *max_low,
                   unsigned long *max_high)
{
    struct meminfo *mi = &meminfo;
    int i;

    /* This assumes the meminfo array is properly sorted */
    *min = bank_pfn_start(&mi->bank[0]);
    for_each_bank (i, mi)
        if (mi->bank[i].highmem)
                break;
    *max_low = bank_pfn_end(&mi->bank[i - 1]);
    *max_high = bank_pfn_end(&mi->bank[mi->nr_banks - 1]);
}

static void __init arm_bootmem_init(unsigned long start_pfn,
    unsigned long end_pfn)
{
    struct memblock_region *reg;
    unsigned int boot_pages;
    phys_addr_t bitmap;
    pg_data_t *pgdat;

    /*
     * Allocate the bootmem bitmap page.  This must be in a region
     * of memory which has already been mapped.
     */
    boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
    bitmap = memblock_alloc_base(boot_pages << PAGE_SHIFT, L1_CACHE_BYTES,
                __pfn_to_phys(end_pfn));

    /*
     * Initialise the bootmem allocator, handing the
     * memory banks over to bootmem.
     */
    node_set_online(0);
    pgdat = NODE_DATA(0);
    init_bootmem_node(pgdat, __phys_to_pfn(bitmap), start_pfn, end_pfn);

    /* Free the lowmem regions from memblock into bootmem. */
    for_each_memblock(memory, reg) {
        unsigned long start = memblock_region_memory_base_pfn(reg);
        unsigned long end = memblock_region_memory_end_pfn(reg);

        if (end >= end_pfn)
            end = end_pfn;
        if (start >= end)
            break;

        free_bootmem(__pfn_to_phys(start), (end - start) << PAGE_SHIFT);
    }

    /* Reserve the lowmem memblock reserved regions in bootmem. */
    for_each_memblock(reserved, reg) {
        unsigned long start = memblock_region_reserved_base_pfn(reg);
        unsigned long end = memblock_region_reserved_end_pfn(reg);

        if (end >= end_pfn)
            end = end_pfn;
        if (start >= end)
            break;

        reserve_bootmem(__pfn_to_phys(start),
                    (end - start) << PAGE_SHIFT, BOOTMEM_DEFAULT);
    }
}

#ifdef CONFIG_ZONE_DMA

unsigned long arm_dma_zone_size __read_mostly;
EXPORT_SYMBOL(arm_dma_zone_size);

/*
 * The DMA mask corresponding to the maximum bus address allocatable
 * using GFP_DMA.  The default here places no restriction on DMA
 * allocations.  This must be the smallest DMA mask in the system,
 * so a successful GFP_DMA allocation will always satisfy this.
 */
phys_addr_t arm_dma_limit;

static void __init arm_adjust_dma_zone(unsigned long *size, unsigned long *hole,
    unsigned long dma_size)
{
    if (size[0] <= dma_size)
        return;

    size[ZONE_NORMAL] = size[0] - dma_size;
    size[ZONE_DMA] = dma_size;
    hole[ZONE_NORMAL] = hole[0];
    hole[ZONE_DMA] = 0;
}
#endif

void __init setup_dma_zone(struct machine_desc *mdesc)
{
#ifdef CONFIG_ZONE_DMA
    if (mdesc->dma_zone_size) {
        arm_dma_zone_size = mdesc->dma_zone_size;
        arm_dma_limit = PHYS_OFFSET + arm_dma_zone_size - 1;
    } else
        arm_dma_limit = 0xffffffff;
#endif
}

static void __init arm_bootmem_free(unsigned long min, unsigned long max_low,
    unsigned long max_high)
{
    unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
    struct memblock_region *reg;

    /*
     * initialise the zones.
     */
    memset(zone_size, 0, sizeof(zone_size));

    /*
     * The memory size 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] = max_low - min;
#ifdef CONFIG_HIGHMEM
    zone_size[ZONE_HIGHMEM] = max_high - max_low;
#endif

    /*
     * Calculate the size of the holes.
     *  holes = node_size - sum(bank_sizes)
     */
    memcpy(zhole_size, zone_size, sizeof(zhole_size));
    for_each_memblock(memory, reg) {
        unsigned long start = memblock_region_memory_base_pfn(reg);
        unsigned long end = memblock_region_memory_end_pfn(reg);

        if (start < max_low) {
            unsigned long low_end = min(end, max_low);
            zhole_size[0] -= low_end - start;
        }
#ifdef CONFIG_HIGHMEM
        if (end > max_low) {
            unsigned long high_start = max(start, max_low);
            zhole_size[ZONE_HIGHMEM] -= end - high_start;
        }
#endif
    }

#ifdef CONFIG_ZONE_DMA
    /*
     * Adjust the sizes according to any special requirements for
     * this machine type.
     */
    if (arm_dma_zone_size)
        arm_adjust_dma_zone(zone_size, zhole_size,
            arm_dma_zone_size >> PAGE_SHIFT);
#endif

    free_area_init_node(0, zone_size, min, zhole_size);
}

#ifdef CONFIG_HAVE_ARCH_PFN_VALID
int pfn_valid(unsigned long pfn)
{
    return memblock_is_memory(__pfn_to_phys(pfn));
}
EXPORT_SYMBOL(pfn_valid);
#endif

#ifndef CONFIG_SPARSEMEM
static void __init arm_memory_present(void)
{
}
#else
static void __init arm_memory_present(void)
{
    struct memblock_region *reg;

    for_each_memblock(memory, reg)
        memory_present(0, memblock_region_memory_base_pfn(reg),
                   memblock_region_memory_end_pfn(reg));
}
#endif

static bool arm_memblock_steal_permitted = true;

phys_addr_t __init arm_memblock_steal(phys_addr_t size, phys_addr_t align)
{
    phys_addr_t phys;

    BUG_ON(!arm_memblock_steal_permitted);

    phys = memblock_alloc_base(size, align, MEMBLOCK_ALLOC_ANYWHERE);
    memblock_free(phys, size);
    memblock_remove(phys, size);

    return phys;
}

void __init arm_memblock_init(struct meminfo *mi, struct machine_desc *mdesc)
{
    int i;

    for (i = 0; i < mi->nr_banks; i++)
        memblock_add(mi->bank[i].start, mi->bank[i].size);

    /* Register the kernel text, kernel data and initrd with memblock. */
#ifdef CONFIG_XIP_KERNEL
    memblock_reserve(__pa(_sdata), _end - _sdata);
#else
    memblock_reserve(__pa(_stext), _end - _stext);
#endif
#ifdef CONFIG_BLK_DEV_INITRD
    if (phys_initrd_size &&
        !memblock_is_region_memory(phys_initrd_start, phys_initrd_size)) {
        pr_err("INITRD: 0x%08lx+0x%08lx is not a memory region - disabling initrd\n",
               phys_initrd_start, phys_initrd_size);
        phys_initrd_start = phys_initrd_size = 0;
    }
    if (phys_initrd_size &&
        memblock_is_region_reserved(phys_initrd_start, phys_initrd_size)) {
        pr_err("INITRD: 0x%08lx+0x%08lx overlaps in-use memory region - disabling initrd\n",
               phys_initrd_start, phys_initrd_size);
        phys_initrd_start = phys_initrd_size = 0;
    }
    if (phys_initrd_size) {
        memblock_reserve(phys_initrd_start, phys_initrd_size);

        /* Now convert initrd to virtual addresses */
        initrd_start = __phys_to_virt(phys_initrd_start);
        initrd_end = initrd_start + phys_initrd_size;
    }
#endif

    arm_mm_memblock_reserve();
    arm_dt_memblock_reserve();

    /* reserve any platform specific memblock areas */
    if (mdesc->reserve)
        mdesc->reserve();

    /*
     * reserve memory for DMA contigouos allocations,
     * must come from DMA area inside low memory
     */
    dma_contiguous_reserve(min(arm_dma_limit, arm_lowmem_limit));

    arm_memblock_steal_permitted = false;
    memblock_allow_resize();
    memblock_dump_all();
}

void __init bootmem_init(void)
{
    unsigned long min, max_low, max_high;

    max_low = max_high = 0;

    find_limits(&min, &max_low, &max_high);

    arm_bootmem_init(min, max_low);

    /*
     * Sparsemem tries to allocate bootmem in memory_present(),
     * so must be done after the fixed reservations
     */
    arm_memory_present();

    /*
     * sparse_init() needs the bootmem allocator up and running.
     */
    sparse_init();

    /*
     * Now free the memory - free_area_init_node needs
     * the sparse mem_map arrays initialized by sparse_init()
     * for memmap_init_zone(), otherwise all PFNs are invalid.
     */
    arm_bootmem_free(min, max_low, max_high);

    /*
     * 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_low_pfn = max_low - PHYS_PFN_OFFSET;
    max_pfn = max_high - PHYS_PFN_OFFSET;
}

static inline int free_area(unsigned long pfn, unsigned long end, char *s)
{
    unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10);

    for (; pfn < end; pfn++) {
        struct page *page = pfn_to_page(pfn);
        ClearPageReserved(page);
        init_page_count(page);
        __free_page(page);
        pages++;
    }

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

    return pages;
}

/*
 * Poison init memory with an undefined instruction (ARM) or a branch to an
 * undefined instruction (Thumb).
 */
static inline void poison_init_mem(void *s, size_t count)
{
    u32 *p = (u32 *)s;
    for (; count != 0; count -= 4)
        *p++ = 0xe7fddef0;
}

static inline void
free_memmap(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 - 1) + 1;
    end_pg = pfn_to_page(end_pfn - 1) + 1;

    /*
     * Convert to physical addresses, and
     * round start upwards and end downwards.
     */
    pg = (unsigned long)PAGE_ALIGN(__pa(start_pg));
    pgend = (unsigned long)__pa(end_pg) & PAGE_MASK;

    /*
     * If there are free pages between these,
     * free the section of the memmap array.
     */
    if (pg < pgend)
        free_bootmem(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(struct meminfo *mi)
{
    unsigned long bank_start, prev_bank_end = 0;
    unsigned int i;

    /*
     * This relies on each bank being in address order.
     * The banks are sorted previously in bootmem_init().
     */
    for_each_bank(i, mi) {
        struct membank *bank = &mi->bank[i];

        bank_start = bank_pfn_start(bank);

#ifdef CONFIG_SPARSEMEM
        /*
         * Take care not to free memmap entries that don't exist
         * due to SPARSEMEM sections which aren't present.
         */
        bank_start = min(bank_start,
                 ALIGN(prev_bank_end, PAGES_PER_SECTION));
#else
        /*
         * Align down here since the VM subsystem insists that the
         * memmap entries are valid from the bank start aligned to
         * MAX_ORDER_NR_PAGES.
         */
        bank_start = round_down(bank_start, MAX_ORDER_NR_PAGES);
#endif
        /*
         * 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(prev_bank_end, bank_start);

        /*
         * Align up here since the VM subsystem insists that the
         * memmap entries are valid from the bank end aligned to
         * MAX_ORDER_NR_PAGES.
         */
        prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES);
    }

#ifdef CONFIG_SPARSEMEM
    if (!IS_ALIGNED(prev_bank_end, PAGES_PER_SECTION))
        free_memmap(prev_bank_end,
                ALIGN(prev_bank_end, PAGES_PER_SECTION));
#endif
}

static void __init free_highpages(void)
{
#ifdef CONFIG_HIGHMEM
    unsigned long max_low = max_low_pfn + PHYS_PFN_OFFSET;
    struct memblock_region *mem, *res;

    /* set highmem page free */
    for_each_memblock(memory, mem) {
        unsigned long start = memblock_region_memory_base_pfn(mem);
        unsigned long end = memblock_region_memory_end_pfn(mem);

        /* Ignore complete lowmem entries */
        if (end <= max_low)
            continue;

        /* Truncate partial highmem entries */
        if (start < max_low)
            start = max_low;

        /* Find and exclude any reserved regions */
        for_each_memblock(reserved, res) {
            unsigned long res_start, res_end;

            res_start = memblock_region_reserved_base_pfn(res);
            res_end = memblock_region_reserved_end_pfn(res);

            if (res_end < start)
                continue;
            if (res_start < start)
                res_start = start;
            if (res_start > end)
                res_start = end;
            if (res_end > end)
                res_end = end;
            if (res_start != start)
                totalhigh_pages += free_area(start, res_start,
                                 NULL);
            start = res_end;
            if (start == end)
                break;
        }

        /* And now free anything which remains */
        if (start < end)
            totalhigh_pages += free_area(start, end, NULL);
    }
    totalram_pages += totalhigh_pages;
#endif
}

/*
 * 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 long reserved_pages, free_pages;
    struct memblock_region *reg;
    int i;
#ifdef CONFIG_HAVE_TCM
    /* These pointers are filled in on TCM detection */
    extern u32 dtcm_end;
    extern u32 itcm_end;
#endif

    max_mapnr   = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;

    /* this will put all unused low memory onto the freelists */
    free_unused_memmap(&meminfo);

    totalram_pages += free_all_bootmem();

#ifdef CONFIG_SA1111
    /* now that our DMA memory is actually so designated, we can free it */
    totalram_pages += free_area(PHYS_PFN_OFFSET,
                    __phys_to_pfn(__pa(swapper_pg_dir)), NULL);
#endif

    free_highpages();

    reserved_pages = free_pages = 0;

    for_each_bank(i, &meminfo) {
        struct membank *bank = &meminfo.bank[i];
        unsigned int pfn1, pfn2;
        struct page *page, *end;

        pfn1 = bank_pfn_start(bank);
        pfn2 = bank_pfn_end(bank);

        page = pfn_to_page(pfn1);
        end  = pfn_to_page(pfn2 - 1) + 1;

        do {
            if (PageReserved(page))
                reserved_pages++;
            else if (!page_count(page))
                free_pages++;
            page++;
        } while (page < end);
    }

    /*
     * 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_each_memblock(memory, reg) {
        unsigned long pages = memblock_region_memory_end_pfn(reg) -
            memblock_region_memory_base_pfn(reg);
        num_physpages += pages;
        printk(" %ldMB", pages >> (20 - PAGE_SHIFT));
    }
    printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT));

    printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem\n",
        nr_free_pages() << (PAGE_SHIFT-10),
        free_pages << (PAGE_SHIFT-10),
        reserved_pages << (PAGE_SHIFT-10),
        totalhigh_pages << (PAGE_SHIFT-10));

#define MLK(b, t) b, t, ((t) - (b)) >> 10
#define MLM(b, t) b, t, ((t) - (b)) >> 20
#define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)

    printk(KERN_NOTICE "Virtual kernel memory layout:\n"
            "    vector  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
#ifdef CONFIG_HAVE_TCM
            "    DTCM    : 0x%08lx - 0x%08lx   (%4ld kB)\n"
            "    ITCM    : 0x%08lx - 0x%08lx   (%4ld kB)\n"
#endif
            "    fixmap  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
            "    vmalloc : 0x%08lx - 0x%08lx   (%4ld MB)\n"
            "    lowmem  : 0x%08lx - 0x%08lx   (%4ld MB)\n"
#ifdef CONFIG_HIGHMEM
            "    pkmap   : 0x%08lx - 0x%08lx   (%4ld MB)\n"
#endif
#ifdef CONFIG_MODULES
            "    modules : 0x%08lx - 0x%08lx   (%4ld MB)\n"
#endif
            "      .text : 0x%p" " - 0x%p" "   (%4d kB)\n"
            "      .init : 0x%p" " - 0x%p" "   (%4d kB)\n"
            "      .data : 0x%p" " - 0x%p" "   (%4d kB)\n"
            "       .bss : 0x%p" " - 0x%p" "   (%4d kB)\n",

            MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) +
                (PAGE_SIZE)),
#ifdef CONFIG_HAVE_TCM
            MLK(DTCM_OFFSET, (unsigned long) dtcm_end),
            MLK(ITCM_OFFSET, (unsigned long) itcm_end),
#endif
            MLK(FIXADDR_START, FIXADDR_TOP),
            MLM(VMALLOC_START, VMALLOC_END),
            MLM(PAGE_OFFSET, (unsigned long)high_memory),
#ifdef CONFIG_HIGHMEM
            MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) *
                (PAGE_SIZE)),
#endif
#ifdef CONFIG_MODULES
            MLM(MODULES_VADDR, MODULES_END),
#endif

            MLK_ROUNDUP(_text, _etext),
            MLK_ROUNDUP(__init_begin, __init_end),
            MLK_ROUNDUP(_sdata, _edata),
            MLK_ROUNDUP(__bss_start, __bss_stop));

#undef MLK
#undef MLM
#undef MLK_ROUNDUP

    /*
     * Check boundaries twice: Some fundamental inconsistencies can
     * be detected at build time already.
     */
#ifdef CONFIG_MMU
    BUILD_BUG_ON(TASK_SIZE              > MODULES_VADDR);
    BUG_ON(TASK_SIZE                > MODULES_VADDR);
#endif

#ifdef CONFIG_HIGHMEM
    BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET);
    BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE  > PAGE_OFFSET);
#endif

    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)
{
#ifdef CONFIG_HAVE_TCM
    extern char __tcm_start, __tcm_end;

    poison_init_mem(&__tcm_start, &__tcm_end - &__tcm_start);
    totalram_pages += free_area(__phys_to_pfn(__pa(&__tcm_start)),
                    __phys_to_pfn(__pa(&__tcm_end)),
                    "TCM link");
#endif

    poison_init_mem(__init_begin, __init_end - __init_begin);
    if (!machine_is_integrator() && !machine_is_cintegrator())
        totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)),
                        __phys_to_pfn(__pa(__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) {
        poison_init_mem((void *)start, PAGE_ALIGN(end) - start);
        totalram_pages += free_area(__phys_to_pfn(__pa(start)),
                        __phys_to_pfn(__pa(end)),
                        "initrd");
    }
}

static int __init keepinitrd_setup(char *__unused)
{
    keep_initrd = 1;
    return 1;
}

__setup("keepinitrd", keepinitrd_setup);
#endif