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

 /*
  * linux/arch/sh/mm/init.c
  *
  *  Copyright (C) 1999  Niibe Yutaka
  *  Copyright (C) 2002 - 2007  Paul Mundt
  *
  *  Based on linux/arch/i386/mm/init.c:
  *   Copyright (C) 1995  Linus Torvalds
  */
 #include <linux/mm.h>
 #include <linux/swap.h>
 #include <linux/init.h>
 #include <linux/bootmem.h>
 #include <linux/proc_fs.h>
 #include <linux/pagemap.h>
 #include <linux/percpu.h>
 #include <linux/io.h>
 #include <asm/mmu_context.h>
 #include <asm/tlb.h>
 #include <asm/cacheflush.h>
 #include <asm/cache.h>

 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
 pgd_t swapper_pg_dir[PTRS_PER_PGD];

 void (*copy_page)(void *from, void *to);
 void (*clear_page)(void *to);

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

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

 	for_each_online_pgdat(pgdat) {
 		struct page *page, *end;
 		unsigned long flags;

 		pgdat_resize_lock(pgdat, &flags);
 		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);

 		pgdat_resize_unlock(pgdat, &flags);
 	}

 	printk("Free swap:       %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10));
 	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);
 	printk(KERN_INFO "Total of %ld pages in page table cache\n",
 	       quicklist_total_size());
 }

 #ifdef CONFIG_MMU
 static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot)
 {
 	pgd_t *pgd;
 	pud_t *pud;
 	pmd_t *pmd;
 	pte_t *pte;

 	pgd = pgd_offset_k(addr);
 	if (pgd_none(*pgd)) {
 		pgd_ERROR(*pgd);
 		return;
 	}

 	pud = pud_alloc(NULL, pgd, addr);
 	if (unlikely(!pud)) {
 		pud_ERROR(*pud);
 		return;
 	}

 	pmd = pmd_alloc(NULL, pud, addr);
 	if (unlikely(!pmd)) {
 		pmd_ERROR(*pmd);
 		return;
 	}

 	pte = pte_offset_kernel(pmd, addr);
 	if (!pte_none(*pte)) {
 		pte_ERROR(*pte);
 		return;
 	}

 	set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, prot));

 	flush_tlb_one(get_asid(), addr);
 }

 /*
  * As a performance optimization, other platforms preserve the fixmap mapping
  * across a context switch, we don't presently do this, but this could be done
  * in a similar fashion as to the wired TLB interface that sh64 uses (by way
  * of the memory mapped UTLB configuration) -- this unfortunately forces us to
  * give up a TLB entry for each mapping we want to preserve. While this may be
  * viable for a small number of fixmaps, it's not particularly useful for
  * everything and needs to be carefully evaluated. (ie, we may want this for
  * the vsyscall page).
  *
  * XXX: Perhaps add a _PAGE_WIRED flag or something similar that we can pass
  * in at __set_fixmap() time to determine the appropriate behavior to follow.
  *
  *					 -- PFM.
  */
 void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot)
 {
 	unsigned long address = __fix_to_virt(idx);

 	if (idx >= __end_of_fixed_addresses) {
 		BUG();
 		return;
 	}

 	set_pte_phys(address, phys, prot);
 }
 #endif	/* CONFIG_MMU */

 /* References to section boundaries */

 extern char _text, _etext, _edata, __bss_start, _end;
 extern char __init_begin, __init_end;

 /*
  * paging_init() sets up the page tables
  */
 void __init paging_init(void)
 {
 	int nid;

 	/* We don't need to map the kernel through the TLB, as
 	 * it is permanatly mapped using P1. So clear the
 	 * entire pgd. */
 	memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir));

 	/* Set an initial value for the MMU.TTB so we don't have to
 	 * check for a null value. */
 	set_TTB(swapper_pg_dir);

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

 		memset(max_zone_pfns, 0, sizeof(max_zone_pfns));

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

 		max_zone_pfns[ZONE_NORMAL] = low;
 		add_active_range(nid, start_pfn, low);

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

 		free_area_init_nodes(max_zone_pfns);

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

 static struct kcore_list kcore_mem, kcore_vmalloc;

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

 	reservedpages = 0;

 	for_each_online_node(nid) {
 		pg_data_t *pgdat = NODE_DATA(nid);
 		unsigned long node_pages = 0;
 		void *node_high_memory;
 		int i;

 		num_physpages += pgdat->node_present_pages;

 		if (pgdat->node_spanned_pages)
 			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;
 	}

 	/* clear the zero-page */
 	memset(empty_zero_page, 0, PAGE_SIZE);
 	__flush_wback_region(empty_zero_page, PAGE_SIZE);

 	/*
 	 * Setup wrappers for copy/clear_page(), these will get overridden
 	 * later in the boot process if a better method is available.
 	 */
 #ifdef CONFIG_MMU
 	copy_page = copy_page_slow;
 	clear_page = clear_page_slow;
 #else
 	copy_page = copy_page_nommu;
 	clear_page = clear_page_nommu;
 #endif

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

 	kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT);
 	kclist_add(&kcore_vmalloc, (void *)VMALLOC_START,
 		   VMALLOC_END - VMALLOC_START);

 	printk(KERN_INFO "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);

 	p3_cache_init();

 	/* Initialize the vDSO */
 	vsyscall_init();
 }

 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 ("Freeing unused kernel memory: %dk freed\n", (&__init_end - &__init_begin) >> 10);
 }

 #ifdef CONFIG_BLK_DEV_INITRD
 void free_initrd_mem(unsigned long start, unsigned long end)
 {
 	unsigned long p;
 	for (p = start; p < end; p += PAGE_SIZE) {
 		ClearPageReserved(virt_to_page(p));
 		init_page_count(virt_to_page(p));
 		free_page(p);
 		totalram_pages++;
 	}
 	printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
 }
 #endif
	/*
	* linux/arch/sh/mm/init.c
	*
	* Copyright (C) 1999 Niibe Yutaka
	* Copyright (C) 2002 - 2007 Paul Mundt
	*
	* Based on linux/arch/i386/mm/init.c:
	* Copyright (C) 1995 Linus Torvalds
	*/
	#include <linux/mm.h>
	#include <linux/swap.h>
	#include <linux/init.h>
	#include <linux/bootmem.h>
	#include <linux/proc_fs.h>
	#include <linux/pagemap.h>
	#include <linux/percpu.h>
	#include <linux/io.h>
	#include <asm/mmu_context.h>
	#include <asm/tlb.h>
	#include <asm/cacheflush.h>
	#include <asm/cache.h>

	DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
	pgd_t swapper_pg_dir[PTRS_PER_PGD];

	void (copy_page)(void from, void *to);
	void (clear_page)(void to);

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

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

	for_each_online_pgdat(pgdat) {
	struct page page, end;
	unsigned long flags;

	pgdat_resize_lock(pgdat, &flags);
	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);

	pgdat_resize_unlock(pgdat, &flags);
	}

	printk("Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10));
	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);
	printk(KERN_INFO "Total of %ld pages in page table cache\n",
	quicklist_total_size());
	}

	#ifdef CONFIG_MMU
	static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot)
	{
	pgd_t *pgd;
	pud_t *pud;
	pmd_t *pmd;
	pte_t *pte;

	pgd = pgd_offset_k(addr);
	if (pgd_none(*pgd)) {
	pgd_ERROR(*pgd);
	return;
	}

	pud = pud_alloc(NULL, pgd, addr);
	if (unlikely(!pud)) {
	pud_ERROR(*pud);
	return;
	}

	pmd = pmd_alloc(NULL, pud, addr);
	if (unlikely(!pmd)) {
	pmd_ERROR(*pmd);
	return;
	}

	pte = pte_offset_kernel(pmd, addr);
	if (!pte_none(*pte)) {
	pte_ERROR(*pte);
	return;
	}

	set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, prot));

	flush_tlb_one(get_asid(), addr);
	}

	/*
	* As a performance optimization, other platforms preserve the fixmap mapping
	* across a context switch, we don't presently do this, but this could be done
	* in a similar fashion as to the wired TLB interface that sh64 uses (by way
	* of the memory mapped UTLB configuration) -- this unfortunately forces us to
	* give up a TLB entry for each mapping we want to preserve. While this may be
	* viable for a small number of fixmaps, it's not particularly useful for
	* everything and needs to be carefully evaluated. (ie, we may want this for
	* the vsyscall page).
	*
	* XXX: Perhaps add a _PAGE_WIRED flag or something similar that we can pass
	* in at __set_fixmap() time to determine the appropriate behavior to follow.
	*
	* -- PFM.
	*/
	void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot)
	{
	unsigned long address = __fix_to_virt(idx);

	if (idx >= __end_of_fixed_addresses) {
	BUG();
	return;
	}

	set_pte_phys(address, phys, prot);
	}
	#endif /* CONFIG_MMU */

	/* References to section boundaries */

	extern char _text, _etext, _edata, __bss_start, _end;
	extern char __init_begin, __init_end;

	/*
	* paging_init() sets up the page tables
	*/
	void __init paging_init(void)
	{
	int nid;

	/* We don't need to map the kernel through the TLB, as
	* it is permanatly mapped using P1. So clear the
	* entire pgd. */
	memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir));

	/* Set an initial value for the MMU.TTB so we don't have to
	* check for a null value. */
	set_TTB(swapper_pg_dir);

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

	memset(max_zone_pfns, 0, sizeof(max_zone_pfns));

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

	max_zone_pfns[ZONE_NORMAL] = low;
	add_active_range(nid, start_pfn, low);

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

	free_area_init_nodes(max_zone_pfns);

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

	static struct kcore_list kcore_mem, kcore_vmalloc;

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

	reservedpages = 0;

	for_each_online_node(nid) {
	pg_data_t *pgdat = NODE_DATA(nid);
	unsigned long node_pages = 0;
	void *node_high_memory;
	int i;

	num_physpages += pgdat->node_present_pages;

	if (pgdat->node_spanned_pages)
	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;
	}

	/* clear the zero-page */
	memset(empty_zero_page, 0, PAGE_SIZE);
	__flush_wback_region(empty_zero_page, PAGE_SIZE);

	/*
	* Setup wrappers for copy/clear_page(), these will get overridden
	* later in the boot process if a better method is available.
	*/
	#ifdef CONFIG_MMU
	copy_page = copy_page_slow;
	clear_page = clear_page_slow;
	#else
	copy_page = copy_page_nommu;
	clear_page = clear_page_nommu;
	#endif

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

	kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT);
	kclist_add(&kcore_vmalloc, (void *)VMALLOC_START,
	VMALLOC_END - VMALLOC_START);

	printk(KERN_INFO "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);

	p3_cache_init();

	/* Initialize the vDSO */
	vsyscall_init();
	}

	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 ("Freeing unused kernel memory: %dk freed\n", (&__init_end - &__init_begin) >> 10);
	}

	#ifdef CONFIG_BLK_DEV_INITRD
	void free_initrd_mem(unsigned long start, unsigned long end)
	{
	unsigned long p;
	for (p = start; p < end; p += PAGE_SIZE) {
	ClearPageReserved(virt_to_page(p));
	init_page_count(virt_to_page(p));
	free_page(p);
	totalram_pages++;
	}
	printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
	}
	#endif