/*
   *  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 <asm/mach-types.h>

  #include <asm/memblock.h>

  #include <asm/prom.h>

  #include <asm/sections.h>

  #include <asm/setup.h>

  #include <asm/sizes.h>

  #include <asm/tlb.h>

  #include <asm/fixmap.h>

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

  #include <asm/memblock.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.
  ");
  	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:
  ");

  	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
  ", total);
  	printk("%d free pages
  ", free);
  	printk("%d reserved pages
  ", reserved);
  	printk("%d slab pages
  ", slab);
  	printk("%d pages shared
  ", shared);
  	printk("%d pages swap cached
  ", 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.
   */
  u32 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

  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);
  		arm_dma_limit = PHYS_OFFSET + arm_dma_zone_size - 1;
  	} else
  		arm_dma_limit = 0xffffffff;

  #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 arm_memory_present(void)

  {
  }
  #else

  static void 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 arm_memblock_steal(phys_addr_t size, phys_addr_t align)
  {
  	phys_addr_t phys;
  
  	BUG_ON(!arm_memblock_steal_permitted);
  
  	phys = memblock_alloc(size, align);
  	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
  ",
  		       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
  ",
  		       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();

  	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
  ", 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
  ", num_physpages >> (20 - PAGE_SHIFT));

  	printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem
  ",
  		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:
  "
  			"    vector  : 0x%08lx - 0x%08lx   (%4ld kB)
  "

  #ifdef CONFIG_HAVE_TCM

  			"    DTCM    : 0x%08lx - 0x%08lx   (%4ld kB)
  "

  			"    ITCM    : 0x%08lx - 0x%08lx   (%4ld kB)
  "
  #endif

  			"    fixmap  : 0x%08lx - 0x%08lx   (%4ld kB)
  "
  			"    vmalloc : 0x%08lx - 0x%08lx   (%4ld MB)
  "
  			"    lowmem  : 0x%08lx - 0x%08lx   (%4ld MB)
  "
  #ifdef CONFIG_HIGHMEM
  			"    pkmap   : 0x%08lx - 0x%08lx   (%4ld MB)
  "
  #endif
  			"    modules : 0x%08lx - 0x%08lx   (%4ld MB)
  "

  			"      .text : 0x%p" " - 0x%p" "   (%4d kB)
  "

  			"      .init : 0x%p" " - 0x%p" "   (%4d kB)
  "

  			"      .data : 0x%p" " - 0x%p" "   (%4d kB)
  "
  			"       .bss : 0x%p" " - 0x%p" "   (%4d kB)
  ",

  
  			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
  			MLM(MODULES_VADDR, MODULES_END),

  			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