arch/avr32/mm/init.c - kernel/msm-4.9 - Gitiles

 /*
  * Copyright (C) 2004-2006 Atmel Corporation
  *
  * 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/mm.h>
 #include <linux/swap.h>
 #include <linux/init.h>
 #include <linux/initrd.h>
 #include <linux/mmzone.h>
 #include <linux/bootmem.h>
 #include <linux/pagemap.h>
 #include <linux/pfn.h>
 #include <linux/nodemask.h>

 #include <asm/page.h>
 #include <asm/mmu_context.h>
 #include <asm/tlb.h>
 #include <asm/io.h>
 #include <asm/dma.h>
 #include <asm/setup.h>
 #include <asm/sections.h>

 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);

 pgd_t swapper_pg_dir[PTRS_PER_PGD];

 struct page *empty_zero_page;

 /*
  * Cache of MMU context last used.
  */
 unsigned long mmu_context_cache = NO_CONTEXT;

 #define START_PFN	(NODE_DATA(0)->bdata->node_boot_start >> PAGE_SHIFT)
 #define MAX_LOW_PFN	(NODE_DATA(0)->bdata->node_low_pfn)

 void show_mem(void)
 {
 	int total = 0, reserved = 0, cached = 0;
 	int slab = 0, free = 0, shared = 0;
 	pg_data_t *pgdat;

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

 	for_each_online_pgdat(pgdat) {
 		struct page *page, *end;

 		page = pgdat->node_mem_map;
 		end = page + pgdat->node_spanned_pages;

 		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 print_memory_map(const char *what,
 				    struct tag_mem_range *mem)
 {
 	printk ("%s:\n", what);
 	for (; mem; mem = mem->next) {
 		printk ("  %08lx - %08lx\n",
 			(unsigned long)mem->addr,
 			(unsigned long)(mem->addr + mem->size));
 	}
 }

 #define MAX_LOWMEM	HIGHMEM_START
 #define MAX_LOWMEM_PFN	PFN_DOWN(MAX_LOWMEM)

 /*
  * Sort a list of memory regions in-place by ascending address.
  *
  * We're using bubble sort because we only have singly linked lists
  * with few elements.
  */
 static void __init sort_mem_list(struct tag_mem_range **pmem)
 {
 	int done;
 	struct tag_mem_range **a, **b;

 	if (!*pmem)
 		return;

 	do {
 		done = 1;
 		a = pmem, b = &(*pmem)->next;
 		while (*b) {
 			if ((*a)->addr > (*b)->addr) {
 				struct tag_mem_range *tmp;
 				tmp = (*b)->next;
 				(*b)->next = *a;
 				*a = *b;
 				*b = tmp;
 				done = 0;
 			}
 			a = &(*a)->next;
 			b = &(*a)->next;
 		}
 	} while (!done);
 }

 /*
  * Find a free memory region large enough for storing the
  * bootmem bitmap.
  */
 static unsigned long __init
 find_bootmap_pfn(const struct tag_mem_range *mem)
 {
 	unsigned long bootmap_pages, bootmap_len;
 	unsigned long node_pages = PFN_UP(mem->size);
 	unsigned long bootmap_addr = mem->addr;
 	struct tag_mem_range *reserved = mem_reserved;
 	struct tag_mem_range *ramdisk = mem_ramdisk;
 	unsigned long kern_start = virt_to_phys(_stext);
 	unsigned long kern_end = virt_to_phys(_end);

 	bootmap_pages = bootmem_bootmap_pages(node_pages);
 	bootmap_len = bootmap_pages << PAGE_SHIFT;

 	/*
 	 * Find a large enough region without reserved pages for
 	 * storing the bootmem bitmap. We can take advantage of the
 	 * fact that all lists have been sorted.
 	 *
 	 * We have to check explicitly reserved regions as well as the
 	 * kernel image and any RAMDISK images...
 	 *
 	 * Oh, and we have to make sure we don't overwrite the taglist
 	 * since we're going to use it until the bootmem allocator is
 	 * fully up and running.
 	 */
 	while (1) {
 		if ((bootmap_addr < kern_end) &&
 		    ((bootmap_addr + bootmap_len) > kern_start))
 			bootmap_addr = kern_end;

 		while (reserved &&
 		       (bootmap_addr >= (reserved->addr + reserved->size)))
 			reserved = reserved->next;

 		if (reserved &&
 		    ((bootmap_addr + bootmap_len) >= reserved->addr)) {
 			bootmap_addr = reserved->addr + reserved->size;
 			continue;
 		}

 		while (ramdisk &&
 		       (bootmap_addr >= (ramdisk->addr + ramdisk->size)))
 			ramdisk = ramdisk->next;

 		if (!ramdisk ||
 		    ((bootmap_addr + bootmap_len) < ramdisk->addr))
 			break;

 		bootmap_addr = ramdisk->addr + ramdisk->size;
 	}

 	if ((PFN_UP(bootmap_addr) + bootmap_len) >= (mem->addr + mem->size))
 		return ~0UL;

 	return PFN_UP(bootmap_addr);
 }

 void __init setup_bootmem(void)
 {
 	unsigned bootmap_size;
 	unsigned long first_pfn, bootmap_pfn, pages;
 	unsigned long max_pfn, max_low_pfn;
 	unsigned long kern_start = virt_to_phys(_stext);
 	unsigned long kern_end = virt_to_phys(_end);
 	unsigned node = 0;
 	struct tag_mem_range *bank, *res;

 	sort_mem_list(&mem_phys);
 	sort_mem_list(&mem_reserved);

 	print_memory_map("Physical memory", mem_phys);
 	print_memory_map("Reserved memory", mem_reserved);

 	nodes_clear(node_online_map);

 	if (mem_ramdisk) {
 #ifdef CONFIG_BLK_DEV_INITRD
 		initrd_start = (unsigned long)__va(mem_ramdisk->addr);
 		initrd_end = initrd_start + mem_ramdisk->size;

 		print_memory_map("RAMDISK images", mem_ramdisk);
 		if (mem_ramdisk->next)
 			printk(KERN_WARNING
 			       "Warning: Only the first RAMDISK image "
 			       "will be used\n");
 		sort_mem_list(&mem_ramdisk);
 #else
 		printk(KERN_WARNING "RAM disk image present, but "
 		       "no initrd support in kernel!\n");
 #endif
 	}

 	if (mem_phys->next)
 		printk(KERN_WARNING "Only using first memory bank\n");

 	for (bank = mem_phys; bank; bank = NULL) {
 		first_pfn = PFN_UP(bank->addr);
 		max_low_pfn = max_pfn = PFN_DOWN(bank->addr + bank->size);
 		bootmap_pfn = find_bootmap_pfn(bank);
 		if (bootmap_pfn > max_pfn)
 			panic("No space for bootmem bitmap!\n");

 		if (max_low_pfn > MAX_LOWMEM_PFN) {
 			max_low_pfn = MAX_LOWMEM_PFN;
 #ifndef CONFIG_HIGHMEM
 			/*
 			 * Lowmem is memory that can be addressed
 			 * directly through P1/P2
 			 */
 			printk(KERN_WARNING
 			       "Node %u: Only %ld MiB of memory will be used.\n",
 			       node, MAX_LOWMEM >> 20);
 			printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n");
 #else
 #error HIGHMEM is not supported by AVR32 yet
 #endif
 		}

 		/* Initialize the boot-time allocator with low memory only. */
 		bootmap_size = init_bootmem_node(NODE_DATA(node), bootmap_pfn,
 						 first_pfn, max_low_pfn);

 		printk("Node %u: bdata = %p, bdata->node_bootmem_map = %p\n",
 		       node, NODE_DATA(node)->bdata,
 		       NODE_DATA(node)->bdata->node_bootmem_map);

 		/*
 		 * Register fully available RAM pages with the bootmem
 		 * allocator.
 		 */
 		pages = max_low_pfn - first_pfn;
 		free_bootmem_node (NODE_DATA(node), PFN_PHYS(first_pfn),
 				   PFN_PHYS(pages));

 		/*
 		 * Reserve space for the kernel image (if present in
 		 * this node)...
 		 */
 		if ((kern_start >= PFN_PHYS(first_pfn)) &&
 		    (kern_start < PFN_PHYS(max_pfn))) {
 			printk("Node %u: Kernel image %08lx - %08lx\n",
 			       node, kern_start, kern_end);
 			reserve_bootmem_node(NODE_DATA(node), kern_start,
 					     kern_end - kern_start);
 		}

 		/* ...the bootmem bitmap... */
 		reserve_bootmem_node(NODE_DATA(node),
 				     PFN_PHYS(bootmap_pfn),
 				     bootmap_size);

 		/* ...any RAMDISK images... */
 		for (res = mem_ramdisk; res; res = res->next) {
 			if (res->addr > PFN_PHYS(max_pfn))
 				break;

 			if (res->addr >= PFN_PHYS(first_pfn)) {
 				printk("Node %u: RAMDISK %08lx - %08lx\n",
 				       node,
 				       (unsigned long)res->addr,
 				       (unsigned long)(res->addr + res->size));
 				reserve_bootmem_node(NODE_DATA(node),
 						     res->addr, res->size);
 			}
 		}

 		/* ...and any other reserved regions. */
 		for (res = mem_reserved; res; res = res->next) {
 			if (res->addr > PFN_PHYS(max_pfn))
 				break;

 			if (res->addr >= PFN_PHYS(first_pfn)) {
 				printk("Node %u: Reserved %08lx - %08lx\n",
 				       node,
 				       (unsigned long)res->addr,
 				       (unsigned long)(res->addr + res->size));
 				reserve_bootmem_node(NODE_DATA(node),
 						     res->addr, res->size);
 			}
 		}

 		node_set_online(node);
 	}
 }

 /*
  * paging_init() sets up the page tables
  *
  * This routine also unmaps the page at virtual kernel address 0, so
  * that we can trap those pesky NULL-reference errors in the kernel.
  */
 void __init paging_init(void)
 {
 	extern unsigned long _evba;
 	void *zero_page;
 	int nid;

 	/*
 	 * Make sure we can handle exceptions before enabling
 	 * paging. Not that we should ever _get_ any exceptions this
 	 * early, but you never know...
 	 */
 	printk("Exception vectors start at %p\n", &_evba);
 	sysreg_write(EVBA, (unsigned long)&_evba);

 	/*
 	 * Since we are ready to handle exceptions now, we should let
 	 * the CPU generate them...
 	 */
 	__asm__ __volatile__ ("csrf %0" : : "i"(SR_EM_BIT));

 	/*
 	 * Allocate the zero page. The allocator will panic if it
 	 * can't satisfy the request, so no need to check.
 	 */
 	zero_page = alloc_bootmem_low_pages_node(NODE_DATA(0),
 						 PAGE_SIZE);

 	{
 		pgd_t *pg_dir;
 		int i;

 		pg_dir = swapper_pg_dir;
 		sysreg_write(PTBR, (unsigned long)pg_dir);

 		for (i = 0; i < PTRS_PER_PGD; i++)
 			pgd_val(pg_dir[i]) = 0;

 		enable_mmu();
 		printk ("CPU: Paging enabled\n");
 	}

 	for_each_online_node(nid) {
 		pg_data_t *pgdat = NODE_DATA(nid);
 		unsigned long zones_size[MAX_NR_ZONES];
 		unsigned long low, start_pfn;

 		start_pfn = pgdat->bdata->node_boot_start;
 		start_pfn >>= PAGE_SHIFT;
 		low = pgdat->bdata->node_low_pfn;

 		memset(zones_size, 0, sizeof(zones_size));
 		zones_size[ZONE_NORMAL] = low - start_pfn;

 		printk("Node %u: start_pfn = 0x%lx, low = 0x%lx\n",
 		       nid, start_pfn, low);

 		free_area_init_node(nid, pgdat, zones_size, start_pfn, NULL);

 		printk("Node %u: mem_map starts at %p\n",
 		       pgdat->node_id, pgdat->node_mem_map);
 	}

 	mem_map = NODE_DATA(0)->node_mem_map;

 	memset(zero_page, 0, PAGE_SIZE);
 	empty_zero_page = virt_to_page(zero_page);
 	flush_dcache_page(empty_zero_page);
 }

 void __init mem_init(void)
 {
 	int codesize, reservedpages, datasize, initsize;
 	int nid, i;

 	reservedpages = 0;
 	high_memory = NULL;

 	/* this will put all low memory onto the freelists */
 	for_each_online_node(nid) {
 		pg_data_t *pgdat = NODE_DATA(nid);
 		unsigned long node_pages = 0;
 		void *node_high_memory;

 		num_physpages += pgdat->node_present_pages;

 		if (pgdat->node_spanned_pages != 0)
 			node_pages = free_all_bootmem_node(pgdat);

 		totalram_pages += node_pages;

 		for (i = 0; i < node_pages; i++)
 			if (PageReserved(pgdat->node_mem_map + i))
 				reservedpages++;

 		node_high_memory = (void *)((pgdat->node_start_pfn
 					     + pgdat->node_spanned_pages)
 					    << PAGE_SHIFT);
 		if (node_high_memory > high_memory)
 			high_memory = node_high_memory;
 	}

 	max_mapnr = MAP_NR(high_memory);

 	codesize = (unsigned long)_etext - (unsigned long)_text;
 	datasize = (unsigned long)_edata - (unsigned long)_data;
 	initsize = (unsigned long)__init_end - (unsigned long)__init_begin;

 	printk ("Memory: %luk/%luk available (%dk kernel code, "
 		"%dk reserved, %dk data, %dk init)\n",
 		(unsigned long)nr_free_pages() << (PAGE_SHIFT - 10),
 		totalram_pages << (PAGE_SHIFT - 10),
 		codesize >> 10,
 		reservedpages << (PAGE_SHIFT - 10),
 		datasize >> 10,
 		initsize >> 10);
 }

 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 (%lx - %lx)\n",
 		       s, size, end - (size << 10), end);
 }

 void free_initmem(void)
 {
 	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
	/*
	* Copyright (C) 2004-2006 Atmel Corporation
	*
	* 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/mm.h>
	#include <linux/swap.h>
	#include <linux/init.h>
	#include <linux/initrd.h>
	#include <linux/mmzone.h>
	#include <linux/bootmem.h>
	#include <linux/pagemap.h>
	#include <linux/pfn.h>
	#include <linux/nodemask.h>

	#include <asm/page.h>
	#include <asm/mmu_context.h>
	#include <asm/tlb.h>
	#include <asm/io.h>
	#include <asm/dma.h>
	#include <asm/setup.h>
	#include <asm/sections.h>

	DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);

	pgd_t swapper_pg_dir[PTRS_PER_PGD];

	struct page *empty_zero_page;

	/*
	* Cache of MMU context last used.
	*/
	unsigned long mmu_context_cache = NO_CONTEXT;

	#define START_PFN (NODE_DATA(0)->bdata->node_boot_start >> PAGE_SHIFT)
	#define MAX_LOW_PFN (NODE_DATA(0)->bdata->node_low_pfn)

	void show_mem(void)
	{
	int total = 0, reserved = 0, cached = 0;
	int slab = 0, free = 0, shared = 0;
	pg_data_t *pgdat;

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

	for_each_online_pgdat(pgdat) {
	struct page page, end;

	page = pgdat->node_mem_map;
	end = page + pgdat->node_spanned_pages;

	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 print_memory_map(const char *what,
	struct tag_mem_range *mem)
	{
	printk ("%s:\n", what);
	for (; mem; mem = mem->next) {
	printk (" %08lx - %08lx\n",
	(unsigned long)mem->addr,
	(unsigned long)(mem->addr + mem->size));
	}
	}

	#define MAX_LOWMEM HIGHMEM_START
	#define MAX_LOWMEM_PFN PFN_DOWN(MAX_LOWMEM)

	/*
	* Sort a list of memory regions in-place by ascending address.
	*
	* We're using bubble sort because we only have singly linked lists
	* with few elements.
	*/
	static void __init sort_mem_list(struct tag_mem_range **pmem)
	{
	int done;
	struct tag_mem_range a, b;

	if (!*pmem)
	return;

	do {
	done = 1;
	a = pmem, b = &(*pmem)->next;
	while (*b) {
	if ((a)->addr > (b)->addr) {
	struct tag_mem_range *tmp;
	tmp = (*b)->next;
	(b)->next = a;
	a = b;
	*b = tmp;
	done = 0;
	}
	a = &(*a)->next;
	b = &(*a)->next;
	}
	} while (!done);
	}

	/*
	* Find a free memory region large enough for storing the
	* bootmem bitmap.
	*/
	static unsigned long __init
	find_bootmap_pfn(const struct tag_mem_range *mem)
	{
	unsigned long bootmap_pages, bootmap_len;
	unsigned long node_pages = PFN_UP(mem->size);
	unsigned long bootmap_addr = mem->addr;
	struct tag_mem_range *reserved = mem_reserved;
	struct tag_mem_range *ramdisk = mem_ramdisk;
	unsigned long kern_start = virt_to_phys(_stext);
	unsigned long kern_end = virt_to_phys(_end);

	bootmap_pages = bootmem_bootmap_pages(node_pages);
	bootmap_len = bootmap_pages << PAGE_SHIFT;

	/*
	* Find a large enough region without reserved pages for
	* storing the bootmem bitmap. We can take advantage of the
	* fact that all lists have been sorted.
	*
	* We have to check explicitly reserved regions as well as the
	* kernel image and any RAMDISK images...
	*
	* Oh, and we have to make sure we don't overwrite the taglist
	* since we're going to use it until the bootmem allocator is
	* fully up and running.
	*/
	while (1) {
	if ((bootmap_addr < kern_end) &&
	((bootmap_addr + bootmap_len) > kern_start))
	bootmap_addr = kern_end;

	while (reserved &&
	(bootmap_addr >= (reserved->addr + reserved->size)))
	reserved = reserved->next;

	if (reserved &&
	((bootmap_addr + bootmap_len) >= reserved->addr)) {
	bootmap_addr = reserved->addr + reserved->size;
	continue;
	}

	while (ramdisk &&
	(bootmap_addr >= (ramdisk->addr + ramdisk->size)))
	ramdisk = ramdisk->next;

	if (!ramdisk \|\|
	((bootmap_addr + bootmap_len) < ramdisk->addr))
	break;

	bootmap_addr = ramdisk->addr + ramdisk->size;
	}

	if ((PFN_UP(bootmap_addr) + bootmap_len) >= (mem->addr + mem->size))
	return ~0UL;

	return PFN_UP(bootmap_addr);
	}

	void __init setup_bootmem(void)
	{
	unsigned bootmap_size;
	unsigned long first_pfn, bootmap_pfn, pages;
	unsigned long max_pfn, max_low_pfn;
	unsigned long kern_start = virt_to_phys(_stext);
	unsigned long kern_end = virt_to_phys(_end);
	unsigned node = 0;
	struct tag_mem_range bank, res;

	sort_mem_list(&mem_phys);
	sort_mem_list(&mem_reserved);

	print_memory_map("Physical memory", mem_phys);
	print_memory_map("Reserved memory", mem_reserved);

	nodes_clear(node_online_map);

	if (mem_ramdisk) {
	#ifdef CONFIG_BLK_DEV_INITRD
	initrd_start = (unsigned long)__va(mem_ramdisk->addr);
	initrd_end = initrd_start + mem_ramdisk->size;

	print_memory_map("RAMDISK images", mem_ramdisk);
	if (mem_ramdisk->next)
	printk(KERN_WARNING
	"Warning: Only the first RAMDISK image "
	"will be used\n");
	sort_mem_list(&mem_ramdisk);
	#else
	printk(KERN_WARNING "RAM disk image present, but "
	"no initrd support in kernel!\n");
	#endif
	}

	if (mem_phys->next)
	printk(KERN_WARNING "Only using first memory bank\n");

	for (bank = mem_phys; bank; bank = NULL) {
	first_pfn = PFN_UP(bank->addr);
	max_low_pfn = max_pfn = PFN_DOWN(bank->addr + bank->size);
	bootmap_pfn = find_bootmap_pfn(bank);
	if (bootmap_pfn > max_pfn)
	panic("No space for bootmem bitmap!\n");

	if (max_low_pfn > MAX_LOWMEM_PFN) {
	max_low_pfn = MAX_LOWMEM_PFN;
	#ifndef CONFIG_HIGHMEM
	/*
	* Lowmem is memory that can be addressed
	* directly through P1/P2
	*/
	printk(KERN_WARNING
	"Node %u: Only %ld MiB of memory will be used.\n",
	node, MAX_LOWMEM >> 20);
	printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n");
	#else
	#error HIGHMEM is not supported by AVR32 yet
	#endif
	}

	/* Initialize the boot-time allocator with low memory only. */
	bootmap_size = init_bootmem_node(NODE_DATA(node), bootmap_pfn,
	first_pfn, max_low_pfn);

	printk("Node %u: bdata = %p, bdata->node_bootmem_map = %p\n",
	node, NODE_DATA(node)->bdata,
	NODE_DATA(node)->bdata->node_bootmem_map);

	/*
	* Register fully available RAM pages with the bootmem
	* allocator.
	*/
	pages = max_low_pfn - first_pfn;
	free_bootmem_node (NODE_DATA(node), PFN_PHYS(first_pfn),
	PFN_PHYS(pages));

	/*
	* Reserve space for the kernel image (if present in
	* this node)...
	*/
	if ((kern_start >= PFN_PHYS(first_pfn)) &&
	(kern_start < PFN_PHYS(max_pfn))) {
	printk("Node %u: Kernel image %08lx - %08lx\n",
	node, kern_start, kern_end);
	reserve_bootmem_node(NODE_DATA(node), kern_start,
	kern_end - kern_start);
	}

	/* ...the bootmem bitmap... */
	reserve_bootmem_node(NODE_DATA(node),
	PFN_PHYS(bootmap_pfn),
	bootmap_size);

	/* ...any RAMDISK images... */
	for (res = mem_ramdisk; res; res = res->next) {
	if (res->addr > PFN_PHYS(max_pfn))
	break;

	if (res->addr >= PFN_PHYS(first_pfn)) {
	printk("Node %u: RAMDISK %08lx - %08lx\n",
	node,
	(unsigned long)res->addr,
	(unsigned long)(res->addr + res->size));
	reserve_bootmem_node(NODE_DATA(node),
	res->addr, res->size);
	}
	}

	/* ...and any other reserved regions. */
	for (res = mem_reserved; res; res = res->next) {
	if (res->addr > PFN_PHYS(max_pfn))
	break;

	if (res->addr >= PFN_PHYS(first_pfn)) {
	printk("Node %u: Reserved %08lx - %08lx\n",
	node,
	(unsigned long)res->addr,
	(unsigned long)(res->addr + res->size));
	reserve_bootmem_node(NODE_DATA(node),
	res->addr, res->size);
	}
	}

	node_set_online(node);
	}
	}

	/*
	* paging_init() sets up the page tables
	*
	* This routine also unmaps the page at virtual kernel address 0, so
	* that we can trap those pesky NULL-reference errors in the kernel.
	*/
	void __init paging_init(void)
	{
	extern unsigned long _evba;
	void *zero_page;
	int nid;

	/*
	* Make sure we can handle exceptions before enabling
	* paging. Not that we should ever _get_ any exceptions this
	* early, but you never know...
	*/
	printk("Exception vectors start at %p\n", &_evba);
	sysreg_write(EVBA, (unsigned long)&_evba);

	/*
	* Since we are ready to handle exceptions now, we should let
	* the CPU generate them...
	*/
	__asm__ __volatile__ ("csrf %0" : : "i"(SR_EM_BIT));

	/*
	* Allocate the zero page. The allocator will panic if it
	* can't satisfy the request, so no need to check.
	*/
	zero_page = alloc_bootmem_low_pages_node(NODE_DATA(0),
	PAGE_SIZE);

	{
	pgd_t *pg_dir;
	int i;

	pg_dir = swapper_pg_dir;
	sysreg_write(PTBR, (unsigned long)pg_dir);

	for (i = 0; i < PTRS_PER_PGD; i++)
	pgd_val(pg_dir[i]) = 0;

	enable_mmu();
	printk ("CPU: Paging enabled\n");
	}

	for_each_online_node(nid) {
	pg_data_t *pgdat = NODE_DATA(nid);
	unsigned long zones_size[MAX_NR_ZONES];
	unsigned long low, start_pfn;

	start_pfn = pgdat->bdata->node_boot_start;
	start_pfn >>= PAGE_SHIFT;
	low = pgdat->bdata->node_low_pfn;

	memset(zones_size, 0, sizeof(zones_size));
	zones_size[ZONE_NORMAL] = low - start_pfn;

	printk("Node %u: start_pfn = 0x%lx, low = 0x%lx\n",
	nid, start_pfn, low);

	free_area_init_node(nid, pgdat, zones_size, start_pfn, NULL);

	printk("Node %u: mem_map starts at %p\n",
	pgdat->node_id, pgdat->node_mem_map);
	}

	mem_map = NODE_DATA(0)->node_mem_map;

	memset(zero_page, 0, PAGE_SIZE);
	empty_zero_page = virt_to_page(zero_page);
	flush_dcache_page(empty_zero_page);
	}

	void __init mem_init(void)
	{
	int codesize, reservedpages, datasize, initsize;
	int nid, i;

	reservedpages = 0;
	high_memory = NULL;

	/* this will put all low memory onto the freelists */
	for_each_online_node(nid) {
	pg_data_t *pgdat = NODE_DATA(nid);
	unsigned long node_pages = 0;
	void *node_high_memory;

	num_physpages += pgdat->node_present_pages;

	if (pgdat->node_spanned_pages != 0)
	node_pages = free_all_bootmem_node(pgdat);

	totalram_pages += node_pages;

	for (i = 0; i < node_pages; i++)
	if (PageReserved(pgdat->node_mem_map + i))
	reservedpages++;

	node_high_memory = (void *)((pgdat->node_start_pfn
	+ pgdat->node_spanned_pages)
	<< PAGE_SHIFT);
	if (node_high_memory > high_memory)
	high_memory = node_high_memory;
	}

	max_mapnr = MAP_NR(high_memory);

	codesize = (unsigned long)_etext - (unsigned long)_text;
	datasize = (unsigned long)_edata - (unsigned long)_data;
	initsize = (unsigned long)__init_end - (unsigned long)__init_begin;

	printk ("Memory: %luk/%luk available (%dk kernel code, "
	"%dk reserved, %dk data, %dk init)\n",
	(unsigned long)nr_free_pages() << (PAGE_SHIFT - 10),
	totalram_pages << (PAGE_SHIFT - 10),
	codesize >> 10,
	reservedpages << (PAGE_SHIFT - 10),
	datasize >> 10,
	initsize >> 10);
	}

	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 (%lx - %lx)\n",
	s, size, end - (size << 10), end);
	}

	void free_initmem(void)
	{
	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