[deliverable/linux.git] / arch / sh / mm / init.c

/*
 * linux/arch/sh/mm/init.c
 *
 *  Copyright (C) 1999  Niibe Yutaka
 *  Copyright (C) 2002 - 2010  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/gfp.h>
#include <linux/bootmem.h>
#include <linux/proc_fs.h>
#include <linux/pagemap.h>
#include <linux/percpu.h>
#include <linux/io.h>
#include <linux/memblock.h>
#include <linux/dma-mapping.h>
#include <asm/mmu_context.h>
#include <asm/mmzone.h>
#include <asm/kexec.h>
#include <asm/tlb.h>
#include <asm/cacheflush.h>
#include <asm/sections.h>
#include <asm/setup.h>
#include <asm/cache.h>
#include <asm/sizes.h>

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

void __init generic_mem_init(void)
{
	memblock_add(__MEMORY_START, __MEMORY_SIZE);
}

void __init __weak plat_mem_setup(void)
{
	/* Nothing to see here, move along. */
}

#ifdef CONFIG_MMU
static pte_t *__get_pte_phys(unsigned long addr)
{
	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 NULL;
	}

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

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

	pte = pte_offset_kernel(pmd, addr);
	return pte;
}

static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot)
{
	pte_t *pte;

	pte = __get_pte_phys(addr);
	if (!pte_none(*pte)) {
		pte_ERROR(*pte);
		return;
	}

	set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, prot));
	local_flush_tlb_one(get_asid(), addr);

	if (pgprot_val(prot) & _PAGE_WIRED)
		tlb_wire_entry(NULL, addr, *pte);
}

static void clear_pte_phys(unsigned long addr, pgprot_t prot)
{
	pte_t *pte;

	pte = __get_pte_phys(addr);

	if (pgprot_val(prot) & _PAGE_WIRED)
		tlb_unwire_entry();

	set_pte(pte, pfn_pte(0, __pgprot(0)));
	local_flush_tlb_one(get_asid(), addr);
}

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);
}

void __clear_fixmap(enum fixed_addresses idx, pgprot_t prot)
{
	unsigned long address = __fix_to_virt(idx);

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

	clear_pte_phys(address, prot);
}

void __init page_table_range_init(unsigned long start, unsigned long end,
					 pgd_t *pgd_base)
{
	pgd_t *pgd;
	pud_t *pud;
	pmd_t *pmd;
	pte_t *pte;
	int i, j, k;
	unsigned long vaddr;

	vaddr = start;
	i = __pgd_offset(vaddr);
	j = __pud_offset(vaddr);
	k = __pmd_offset(vaddr);
	pgd = pgd_base + i;

	for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) {
		pud = (pud_t *)pgd;
		for ( ; (j < PTRS_PER_PUD) && (vaddr != end); pud++, j++) {
#ifdef __PAGETABLE_PMD_FOLDED
			pmd = (pmd_t *)pud;
#else
			pmd = (pmd_t *)alloc_bootmem_low_pages(PAGE_SIZE);
			pud_populate(&init_mm, pud, pmd);
			pmd += k;
#endif
			for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) {
				if (pmd_none(*pmd)) {
					pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
					pmd_populate_kernel(&init_mm, pmd, pte);
					BUG_ON(pte != pte_offset_kernel(pmd, 0));
				}
				vaddr += PMD_SIZE;
			}
			k = 0;
		}
		j = 0;
	}
}
#endif	/* CONFIG_MMU */

void __init allocate_pgdat(unsigned int nid)
{
	unsigned long start_pfn, end_pfn;
#ifdef CONFIG_NEED_MULTIPLE_NODES
	unsigned long phys;
#endif

	get_pfn_range_for_nid(nid, &start_pfn, &end_pfn);

#ifdef CONFIG_NEED_MULTIPLE_NODES
	phys = __memblock_alloc_base(sizeof(struct pglist_data),
				SMP_CACHE_BYTES, end_pfn << PAGE_SHIFT);
	/* Retry with all of system memory */
	if (!phys)
		phys = __memblock_alloc_base(sizeof(struct pglist_data),
					SMP_CACHE_BYTES, memblock_end_of_DRAM());
	if (!phys)
		panic("Can't allocate pgdat for node %d\n", nid);

	NODE_DATA(nid) = __va(phys);
	memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));

	NODE_DATA(nid)->bdata = &bootmem_node_data[nid];
#endif

	NODE_DATA(nid)->node_start_pfn = start_pfn;
	NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn;
}

static void __init bootmem_init_one_node(unsigned int nid)
{
	unsigned long total_pages, paddr;
	unsigned long end_pfn;
	struct pglist_data *p;

	p = NODE_DATA(nid);

	/* Nothing to do.. */
	if (!p->node_spanned_pages)
		return;

	end_pfn = p->node_start_pfn + p->node_spanned_pages;

	total_pages = bootmem_bootmap_pages(p->node_spanned_pages);

	paddr = memblock_alloc(total_pages << PAGE_SHIFT, PAGE_SIZE);
	if (!paddr)
		panic("Can't allocate bootmap for nid[%d]\n", nid);

	init_bootmem_node(p, paddr >> PAGE_SHIFT, p->node_start_pfn, end_pfn);

	free_bootmem_with_active_regions(nid, end_pfn);

	/*
	 * XXX Handle initial reservations for the system memory node
	 * only for the moment, we'll refactor this later for handling
	 * reservations in other nodes.
	 */
	if (nid == 0) {
		struct memblock_region *reg;

		/* Reserve the sections we're already using. */
		for_each_memblock(reserved, reg) {
			reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT);
		}
	}

	sparse_memory_present_with_active_regions(nid);
}

static void __init do_init_bootmem(void)
{
	struct memblock_region *reg;
	int i;

	/* Add active regions with valid PFNs. */
	for_each_memblock(memory, reg) {
		unsigned long start_pfn, end_pfn;
		start_pfn = memblock_region_base_pfn(reg);
		end_pfn = memblock_region_end_pfn(reg);
		__add_active_range(0, start_pfn, end_pfn);
	}

	/* All of system RAM sits in node 0 for the non-NUMA case */
	allocate_pgdat(0);
	node_set_online(0);

	plat_mem_setup();

	for_each_online_node(i)
		bootmem_init_one_node(i);

	sparse_init();
}

static void __init early_reserve_mem(void)
{
	unsigned long start_pfn;

	/*
	 * Partially used pages are not usable - thus
	 * we are rounding upwards:
	 */
	start_pfn = PFN_UP(__pa(_end));

	/*
	 * Reserve the kernel text and Reserve the bootmem bitmap. We do
	 * this in two steps (first step was init_bootmem()), because
	 * this catches the (definitely buggy) case of us accidentally
	 * initializing the bootmem allocator with an invalid RAM area.
	 */
	memblock_reserve(__MEMORY_START + CONFIG_ZERO_PAGE_OFFSET,
		    (PFN_PHYS(start_pfn) + PAGE_SIZE - 1) -
		    (__MEMORY_START + CONFIG_ZERO_PAGE_OFFSET));

	/*
	 * Reserve physical pages below CONFIG_ZERO_PAGE_OFFSET.
	 */
	if (CONFIG_ZERO_PAGE_OFFSET != 0)
		memblock_reserve(__MEMORY_START, CONFIG_ZERO_PAGE_OFFSET);

	/*
	 * Handle additional early reservations
	 */
	check_for_initrd();
	reserve_crashkernel();
}

void __init paging_init(void)
{
	unsigned long max_zone_pfns[MAX_NR_ZONES];
	unsigned long vaddr, end;
	int nid;

	memblock_init();

	sh_mv.mv_mem_init();

	early_reserve_mem();

	memblock_enforce_memory_limit(memory_limit);
	memblock_analyze();

	memblock_dump_all();

	/*
	 * Determine low and high memory ranges:
	 */
	max_low_pfn = max_pfn = memblock_end_of_DRAM() >> PAGE_SHIFT;
	min_low_pfn = __MEMORY_START >> PAGE_SHIFT;

	nodes_clear(node_online_map);

	memory_start = (unsigned long)__va(__MEMORY_START);
	memory_end = memory_start + (memory_limit ?: memblock_phys_mem_size());

	uncached_init();
	pmb_init();
	do_init_bootmem();
	ioremap_fixed_init();

	/* 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);

	/*
	 * Populate the relevant portions of swapper_pg_dir so that
	 * we can use the fixmap entries without calling kmalloc.
	 * pte's will be filled in by __set_fixmap().
	 */
	vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
	end = (FIXADDR_TOP + PMD_SIZE - 1) & PMD_MASK;
	page_table_range_init(vaddr, end, swapper_pg_dir);

	kmap_coherent_init();

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

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

		start_pfn = pgdat->bdata->node_min_pfn;
		low = pgdat->bdata->node_low_pfn;

		if (max_zone_pfns[ZONE_NORMAL] < low)
			max_zone_pfns[ZONE_NORMAL] = low;

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

	free_area_init_nodes(max_zone_pfns);
}

/*
 * Early initialization for any I/O MMUs we might have.
 */
static void __init iommu_init(void)
{
	no_iommu_init();
}

unsigned int mem_init_done = 0;

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

	iommu_init();

	num_physpages = 0;
	high_memory = NULL;

	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)
			node_pages = free_all_bootmem_node(pgdat);

		totalram_pages += node_pages;

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

	/* Set this up early, so we can take care of the zero page */
	cpu_cache_init();

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

	vsyscall_init();

	codesize =  (unsigned long) &_etext - (unsigned long) &_text;
	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 data, %dk init)\n",
		nr_free_pages() << (PAGE_SHIFT-10),
		num_physpages << (PAGE_SHIFT-10),
		codesize >> 10,
		datasize >> 10,
		initsize >> 10);

	printk(KERN_INFO "virtual kernel memory layout:\n"
		"    fixmap  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
#ifdef CONFIG_HIGHMEM
		"    pkmap   : 0x%08lx - 0x%08lx   (%4ld kB)\n"
#endif
		"    vmalloc : 0x%08lx - 0x%08lx   (%4ld MB)\n"
		"    lowmem  : 0x%08lx - 0x%08lx   (%4ld MB) (cached)\n"
#ifdef CONFIG_UNCACHED_MAPPING
		"            : 0x%08lx - 0x%08lx   (%4ld MB) (uncached)\n"
#endif
		"      .init : 0x%08lx - 0x%08lx   (%4ld kB)\n"
		"      .data : 0x%08lx - 0x%08lx   (%4ld kB)\n"
		"      .text : 0x%08lx - 0x%08lx   (%4ld kB)\n",
		FIXADDR_START, FIXADDR_TOP,
		(FIXADDR_TOP - FIXADDR_START) >> 10,

#ifdef CONFIG_HIGHMEM
		PKMAP_BASE, PKMAP_BASE+LAST_PKMAP*PAGE_SIZE,
		(LAST_PKMAP*PAGE_SIZE) >> 10,
#endif

		(unsigned long)VMALLOC_START, VMALLOC_END,
		(VMALLOC_END - VMALLOC_START) >> 20,

		(unsigned long)memory_start, (unsigned long)high_memory,
		((unsigned long)high_memory - (unsigned long)memory_start) >> 20,

#ifdef CONFIG_UNCACHED_MAPPING
		uncached_start, uncached_end, uncached_size >> 20,
#endif

		(unsigned long)&__init_begin, (unsigned long)&__init_end,
		((unsigned long)&__init_end -
		 (unsigned long)&__init_begin) >> 10,

		(unsigned long)&_etext, (unsigned long)&_edata,
		((unsigned long)&_edata - (unsigned long)&_etext) >> 10,

		(unsigned long)&_text, (unsigned long)&_etext,
		((unsigned long)&_etext - (unsigned long)&_text) >> 10);

	mem_init_done = 1;
}

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: %ldk freed\n",
	       ((unsigned long)&__init_end -
	        (unsigned long)&__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

#ifdef CONFIG_MEMORY_HOTPLUG
int arch_add_memory(int nid, u64 start, u64 size)
{
	pg_data_t *pgdat;
	unsigned long start_pfn = start >> PAGE_SHIFT;
	unsigned long nr_pages = size >> PAGE_SHIFT;
	int ret;

	pgdat = NODE_DATA(nid);

	/* We only have ZONE_NORMAL, so this is easy.. */
	ret = __add_pages(nid, pgdat->node_zones + ZONE_NORMAL,
				start_pfn, nr_pages);
	if (unlikely(ret))
		printk("%s: Failed, __add_pages() == %d\n", __func__, ret);

	return ret;
}
EXPORT_SYMBOL_GPL(arch_add_memory);

#ifdef CONFIG_NUMA
int memory_add_physaddr_to_nid(u64 addr)
{
	/* Node 0 for now.. */
	return 0;
}
EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
#endif

#endif /* CONFIG_MEMORY_HOTPLUG */
Commit	Line	Data
01066625 PM	1	/*
01066625 PM	2	* linux/arch/sh/mm/init.c
1da177e4 LT	3	*
1da177e4 LT	4	* Copyright (C) 1999 Niibe Yutaka
19d8f84f	5	* Copyright (C) 2002 - 2010 Paul Mundt
1da177e4 LT	6	*
	7	* Based on linux/arch/i386/mm/init.c:
	8	* Copyright (C) 1995 Linus Torvalds
	9	*/
1da177e4 LT	10	#include <linux/mm.h>
1da177e4 LT	11	#include <linux/swap.h>
1da177e4	12	#include <linux/init.h>
5a0e3ad6	13	#include <linux/gfp.h>
1da177e4	14	#include <linux/bootmem.h>
2cb7ce3b	15	#include <linux/proc_fs.h>
27641dee	16	#include <linux/pagemap.h>
01066625 PM	17	#include <linux/percpu.h>
01066625 PM	18	#include <linux/io.h>
95f72d1e	19	#include <linux/memblock.h>
94c28510	20	#include <linux/dma-mapping.h>
1da177e4	21	#include <asm/mmu_context.h>
4bc277ac	22	#include <asm/mmzone.h>
c77b29db	23	#include <asm/kexec.h>
1da177e4 LT	24	#include <asm/tlb.h>
1da177e4 LT	25	#include <asm/cacheflush.h>
07cbb41b	26	#include <asm/sections.h>
4bc277ac	27	#include <asm/setup.h>
1da177e4	28	#include <asm/cache.h>
b0f3ae03	29	#include <asm/sizes.h>
1da177e4 LT	30
	31	DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
	32	pgd_t swapper_pg_dir[PTRS_PER_PGD];
c6feb614	33
19d8f84f PM	34	void __init generic_mem_init(void)
19d8f84f PM	35	{
95f72d1e	36	memblock_add(__MEMORY_START, __MEMORY_SIZE);
19d8f84f PM	37	}
19d8f84f PM	38
4bc277ac PM	39	void __init __weak plat_mem_setup(void)
	40	{
	41	/* Nothing to see here, move along. */
	42	}
	43
11cbb70e	44	#ifdef CONFIG_MMU
07cad4dc	45	static pte_t *__get_pte_phys(unsigned long addr)
1da177e4 LT	46	{
1da177e4 LT	47	pgd_t *pgd;
26ff6c11	48	pud_t *pud;
1da177e4 LT	49	pmd_t *pmd;
	50	pte_t *pte;
	51
99a596f9	52	pgd = pgd_offset_k(addr);
1da177e4 LT	53	if (pgd_none(*pgd)) {
1da177e4 LT	54	pgd_ERROR(*pgd);
07cad4dc	55	return NULL;
1da177e4 LT	56	}
1da177e4 LT	57
99a596f9 SM	58	pud = pud_alloc(NULL, pgd, addr);
	59	if (unlikely(!pud)) {
	60	pud_ERROR(*pud);
07cad4dc	61	return NULL;
26ff6c11 PM	62	}
26ff6c11 PM	63
99a596f9 SM	64	pmd = pmd_alloc(NULL, pud, addr);
	65	if (unlikely(!pmd)) {
	66	pmd_ERROR(*pmd);
07cad4dc	67	return NULL;
1da177e4 LT	68	}
	69
	70	pte = pte_offset_kernel(pmd, addr);
07cad4dc MF	71	return pte;
	72	}
	73
	74	static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot)
	75	{
	76	pte_t *pte;
	77
	78	pte = __get_pte_phys(addr);
1da177e4 LT	79	if (!pte_none(*pte)) {
	80	pte_ERROR(*pte);
	81	return;
	82	}
	83
	84	set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, prot));
997d0030	85	local_flush_tlb_one(get_asid(), addr);
07cad4dc MF	86
	87	if (pgprot_val(prot) & _PAGE_WIRED)
	88	tlb_wire_entry(NULL, addr, *pte);
	89	}
	90
	91	static void clear_pte_phys(unsigned long addr, pgprot_t prot)
	92	{
	93	pte_t *pte;
	94
	95	pte = __get_pte_phys(addr);
	96
	97	if (pgprot_val(prot) & _PAGE_WIRED)
	98	tlb_unwire_entry();
	99
	100	set_pte(pte, pfn_pte(0, __pgprot(0)));
	101	local_flush_tlb_one(get_asid(), addr);
1da177e4 LT	102	}
1da177e4 LT	103
1da177e4 LT	104	void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot)
	105	{
	106	unsigned long address = __fix_to_virt(idx);
	107
	108	if (idx >= __end_of_fixed_addresses) {
	109	BUG();
	110	return;
	111	}
	112
	113	set_pte_phys(address, phys, prot);
	114	}
2adb4e10	115
07cad4dc MF	116	void __clear_fixmap(enum fixed_addresses idx, pgprot_t prot)
	117	{
	118	unsigned long address = __fix_to_virt(idx);
	119
	120	if (idx >= __end_of_fixed_addresses) {
	121	BUG();
	122	return;
	123	}
	124
	125	clear_pte_phys(address, prot);
	126	}
	127
2adb4e10 SM	128	void __init page_table_range_init(unsigned long start, unsigned long end,
	129	pgd_t *pgd_base)
	130	{
	131	pgd_t *pgd;
	132	pud_t *pud;
	133	pmd_t *pmd;
0906a3ad PM	134	pte_t *pte;
0906a3ad PM	135	int i, j, k;
2adb4e10 SM	136	unsigned long vaddr;
2adb4e10 SM	137
0906a3ad PM	138	vaddr = start;
	139	i = __pgd_offset(vaddr);
	140	j = __pud_offset(vaddr);
	141	k = __pmd_offset(vaddr);
	142	pgd = pgd_base + i;
	143
	144	for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) {
	145	pud = (pud_t *)pgd;
	146	for ( ; (j < PTRS_PER_PUD) && (vaddr != end); pud++, j++) {
5d9b4b19	147	#ifdef __PAGETABLE_PMD_FOLDED
0906a3ad	148	pmd = (pmd_t *)pud;
5d9b4b19 MF	149	#else
	150	pmd = (pmd_t *)alloc_bootmem_low_pages(PAGE_SIZE);
	151	pud_populate(&init_mm, pud, pmd);
	152	pmd += k;
	153	#endif
0906a3ad PM	154	for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) {
	155	if (pmd_none(*pmd)) {
	156	pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
	157	pmd_populate_kernel(&init_mm, pmd, pte);
	158	BUG_ON(pte != pte_offset_kernel(pmd, 0));
	159	}
	160	vaddr += PMD_SIZE;
	161	}
	162	k = 0;
2adb4e10	163	}
0906a3ad	164	j = 0;
2adb4e10 SM	165	}
2adb4e10 SM	166	}
11cbb70e	167	#endif /* CONFIG_MMU */
1da177e4	168
4bc277ac PM	169	void __init allocate_pgdat(unsigned int nid)
	170	{
	171	unsigned long start_pfn, end_pfn;
	172	#ifdef CONFIG_NEED_MULTIPLE_NODES
	173	unsigned long phys;
	174	#endif
	175
	176	get_pfn_range_for_nid(nid, &start_pfn, &end_pfn);
	177
	178	#ifdef CONFIG_NEED_MULTIPLE_NODES
95f72d1e	179	phys = __memblock_alloc_base(sizeof(struct pglist_data),
4bc277ac PM	180	SMP_CACHE_BYTES, end_pfn << PAGE_SHIFT);
	181	/* Retry with all of system memory */
	182	if (!phys)
95f72d1e YL	183	phys = __memblock_alloc_base(sizeof(struct pglist_data),
95f72d1e YL	184	SMP_CACHE_BYTES, memblock_end_of_DRAM());
4bc277ac PM	185	if (!phys)
	186	panic("Can't allocate pgdat for node %d\n", nid);
	187
	188	NODE_DATA(nid) = __va(phys);
	189	memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
	190
	191	NODE_DATA(nid)->bdata = &bootmem_node_data[nid];
	192	#endif
	193
	194	NODE_DATA(nid)->node_start_pfn = start_pfn;
	195	NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn;
	196	}
	197
	198	static void __init bootmem_init_one_node(unsigned int nid)
	199	{
	200	unsigned long total_pages, paddr;
	201	unsigned long end_pfn;
	202	struct pglist_data *p;
4bc277ac PM	203
	204	p = NODE_DATA(nid);
	205
	206	/* Nothing to do.. */
	207	if (!p->node_spanned_pages)
	208	return;
	209
	210	end_pfn = p->node_start_pfn + p->node_spanned_pages;
	211
	212	total_pages = bootmem_bootmap_pages(p->node_spanned_pages);
	213
95f72d1e	214	paddr = memblock_alloc(total_pages << PAGE_SHIFT, PAGE_SIZE);
4bc277ac PM	215	if (!paddr)
	216	panic("Can't allocate bootmap for nid[%d]\n", nid);
	217
	218	init_bootmem_node(p, paddr >> PAGE_SHIFT, p->node_start_pfn, end_pfn);
	219
	220	free_bootmem_with_active_regions(nid, end_pfn);
	221
	222	/*
	223	* XXX Handle initial reservations for the system memory node
	224	* only for the moment, we'll refactor this later for handling
	225	* reservations in other nodes.
	226	*/
	227	if (nid == 0) {
64106ca6 BH	228	struct memblock_region *reg;
64106ca6 BH	229
4bc277ac	230	/* Reserve the sections we're already using. */
64106ca6 BH	231	for_each_memblock(reserved, reg) {
	232	reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT);
	233	}
4bc277ac PM	234	}
	235
	236	sparse_memory_present_with_active_regions(nid);
	237	}
	238
	239	static void __init do_init_bootmem(void)
	240	{
64106ca6	241	struct memblock_region *reg;
4bc277ac PM	242	int i;
	243
	244	/* Add active regions with valid PFNs. */
64106ca6	245	for_each_memblock(memory, reg) {
4bc277ac	246	unsigned long start_pfn, end_pfn;
64106ca6 BH	247	start_pfn = memblock_region_base_pfn(reg);
64106ca6 BH	248	end_pfn = memblock_region_end_pfn(reg);
4bc277ac PM	249	__add_active_range(0, start_pfn, end_pfn);
	250	}
	251
	252	/* All of system RAM sits in node 0 for the non-NUMA case */
	253	allocate_pgdat(0);
	254	node_set_online(0);
	255
	256	plat_mem_setup();
	257
	258	for_each_online_node(i)
	259	bootmem_init_one_node(i);
	260
	261	sparse_init();
	262	}
	263
	264	static void __init early_reserve_mem(void)
	265	{
	266	unsigned long start_pfn;
	267
	268	/*
	269	* Partially used pages are not usable - thus
	270	* we are rounding upwards:
	271	*/
	272	start_pfn = PFN_UP(__pa(_end));
	273
	274	/*
	275	* Reserve the kernel text and Reserve the bootmem bitmap. We do
	276	* this in two steps (first step was init_bootmem()), because
	277	* this catches the (definitely buggy) case of us accidentally
	278	* initializing the bootmem allocator with an invalid RAM area.
	279	*/
95f72d1e	280	memblock_reserve(__MEMORY_START + CONFIG_ZERO_PAGE_OFFSET,
4bc277ac PM	281	(PFN_PHYS(start_pfn) + PAGE_SIZE - 1) -
	282	(__MEMORY_START + CONFIG_ZERO_PAGE_OFFSET));
	283
	284	/*
	285	* Reserve physical pages below CONFIG_ZERO_PAGE_OFFSET.
	286	*/
	287	if (CONFIG_ZERO_PAGE_OFFSET != 0)
95f72d1e	288	memblock_reserve(__MEMORY_START, CONFIG_ZERO_PAGE_OFFSET);
4bc277ac PM	289
	290	/*
	291	* Handle additional early reservations
	292	*/
	293	check_for_initrd();
	294	reserve_crashkernel();
	295	}
	296
1da177e4 LT	297	void __init paging_init(void)
1da177e4 LT	298	{
2de212eb	299	unsigned long max_zone_pfns[MAX_NR_ZONES];
0906a3ad	300	unsigned long vaddr, end;
01066625	301	int nid;
1da177e4	302
95f72d1e	303	memblock_init();
4bc277ac PM	304
	305	sh_mv.mv_mem_init();
	306
	307	early_reserve_mem();
	308
95f72d1e YL	309	memblock_enforce_memory_limit(memory_limit);
95f72d1e YL	310	memblock_analyze();
4bc277ac	311
95f72d1e	312	memblock_dump_all();
4bc277ac PM	313
	314	/*
	315	* Determine low and high memory ranges:
	316	*/
95f72d1e	317	max_low_pfn = max_pfn = memblock_end_of_DRAM() >> PAGE_SHIFT;
4bc277ac PM	318	min_low_pfn = __MEMORY_START >> PAGE_SHIFT;
	319
	320	nodes_clear(node_online_map);
	321
	322	memory_start = (unsigned long)__va(__MEMORY_START);
95f72d1e	323	memory_end = memory_start + (memory_limit ?: memblock_phys_mem_size());
4bc277ac PM	324
	325	uncached_init();
	326	pmb_init();
	327	do_init_bootmem();
	328	ioremap_fixed_init();
	329
01066625 PM	330	/* We don't need to map the kernel through the TLB, as
	331	* it is permanatly mapped using P1. So clear the
	332	* entire pgd. */
	333	memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir));
1da177e4	334
6e4662ff SM	335	/* Set an initial value for the MMU.TTB so we don't have to
	336	* check for a null value. */
	337	set_TTB(swapper_pg_dir);
	338
acca4f4d PM	339	/*
acca4f4d PM	340	* Populate the relevant portions of swapper_pg_dir so that
2adb4e10	341	* we can use the fixmap entries without calling kmalloc.
acca4f4d PM	342	* pte's will be filled in by __set_fixmap().
	343	*/
	344	vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
0906a3ad PM	345	end = (FIXADDR_TOP + PMD_SIZE - 1) & PMD_MASK;
0906a3ad PM	346	page_table_range_init(vaddr, end, swapper_pg_dir);
acca4f4d PM	347
acca4f4d PM	348	kmap_coherent_init();
2adb4e10	349
2de212eb PM	350	memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
2de212eb PM	351
01066625 PM	352	for_each_online_node(nid) {
01066625 PM	353	pg_data_t *pgdat = NODE_DATA(nid);
01066625 PM	354	unsigned long low, start_pfn;
01066625 PM	355
3560e249	356	start_pfn = pgdat->bdata->node_min_pfn;
01066625 PM	357	low = pgdat->bdata->node_low_pfn;
01066625 PM	358
2de212eb PM	359	if (max_zone_pfns[ZONE_NORMAL] < low)
2de212eb PM	360	max_zone_pfns[ZONE_NORMAL] = low;
01066625 PM	361
	362	printk("Node %u: start_pfn = 0x%lx, low = 0x%lx\n",
	363	nid, start_pfn, low);
01066625	364	}
2de212eb PM	365
2de212eb PM	366	free_area_init_nodes(max_zone_pfns);
1da177e4 LT	367	}
1da177e4 LT	368
94c28510 PM	369	/*
	370	* Early initialization for any I/O MMUs we might have.
	371	*/
	372	static void __init iommu_init(void)
	373	{
	374	no_iommu_init();
	375	}
	376
d9b9487a PM	377	unsigned int mem_init_done = 0;
d9b9487a PM	378
1da177e4 LT	379	void __init mem_init(void)
1da177e4 LT	380	{
dfbb9042	381	int codesize, datasize, initsize;
01066625	382	int nid;
1da177e4	383
94c28510 PM	384	iommu_init();
94c28510 PM	385
2de212eb PM	386	num_physpages = 0;
	387	high_memory = NULL;
	388
01066625 PM	389	for_each_online_node(nid) {
	390	pg_data_t *pgdat = NODE_DATA(nid);
	391	unsigned long node_pages = 0;
	392	void *node_high_memory;
01066625 PM	393
	394	num_physpages += pgdat->node_present_pages;
	395
	396	if (pgdat->node_spanned_pages)
	397	node_pages = free_all_bootmem_node(pgdat);
	398
	399	totalram_pages += node_pages;
1da177e4	400
2de212eb PM	401	node_high_memory = (void *)__va((pgdat->node_start_pfn +
	402	pgdat->node_spanned_pages) <<
	403	PAGE_SHIFT);
01066625 PM	404	if (node_high_memory > high_memory)
	405	high_memory = node_high_memory;
	406	}
1da177e4	407
37443ef3 PM	408	/* Set this up early, so we can take care of the zero page */
	409	cpu_cache_init();
	410
1da177e4 LT	411	/* clear the zero-page */
	412	memset(empty_zero_page, 0, PAGE_SIZE);
	413	__flush_wback_region(empty_zero_page, PAGE_SIZE);
	414
35f99c0d PM	415	vsyscall_init();
35f99c0d PM	416
1da177e4 LT	417	codesize = (unsigned long) &_etext - (unsigned long) &_text;
	418	datasize = (unsigned long) &_edata - (unsigned long) &_etext;
	419	initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
	420
2cb7ce3b	421	printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, "
dfbb9042	422	"%dk data, %dk init)\n",
cc013a88	423	nr_free_pages() << (PAGE_SHIFT-10),
2de212eb	424	num_physpages << (PAGE_SHIFT-10),
1da177e4	425	codesize >> 10,
1da177e4 LT	426	datasize >> 10,
	427	initsize >> 10);
	428
35f99c0d PM	429	printk(KERN_INFO "virtual kernel memory layout:\n"
	430	" fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n"
	431	#ifdef CONFIG_HIGHMEM
	432	" pkmap : 0x%08lx - 0x%08lx (%4ld kB)\n"
	433	#endif
	434	" vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n"
3125ee72	435	" lowmem : 0x%08lx - 0x%08lx (%4ld MB) (cached)\n"
b0f3ae03	436	#ifdef CONFIG_UNCACHED_MAPPING
3125ee72	437	" : 0x%08lx - 0x%08lx (%4ld MB) (uncached)\n"
b0f3ae03	438	#endif
35f99c0d PM	439	" .init : 0x%08lx - 0x%08lx (%4ld kB)\n"
	440	" .data : 0x%08lx - 0x%08lx (%4ld kB)\n"
	441	" .text : 0x%08lx - 0x%08lx (%4ld kB)\n",
	442	FIXADDR_START, FIXADDR_TOP,
	443	(FIXADDR_TOP - FIXADDR_START) >> 10,
	444
	445	#ifdef CONFIG_HIGHMEM
	446	PKMAP_BASE, PKMAP_BASE+LAST_PKMAP*PAGE_SIZE,
	447	(LAST_PKMAP*PAGE_SIZE) >> 10,
	448	#endif
	449
	450	(unsigned long)VMALLOC_START, VMALLOC_END,
	451	(VMALLOC_END - VMALLOC_START) >> 20,
	452
	453	(unsigned long)memory_start, (unsigned long)high_memory,
	454	((unsigned long)high_memory - (unsigned long)memory_start) >> 20,
	455
b0f3ae03	456	#ifdef CONFIG_UNCACHED_MAPPING
9edef286	457	uncached_start, uncached_end, uncached_size >> 20,
b0f3ae03	458	#endif
3125ee72	459
35f99c0d PM	460	(unsigned long)&__init_begin, (unsigned long)&__init_end,
	461	((unsigned long)&__init_end -
	462	(unsigned long)&__init_begin) >> 10,
	463
	464	(unsigned long)&_etext, (unsigned long)&_edata,
	465	((unsigned long)&_edata - (unsigned long)&_etext) >> 10,
	466
	467	(unsigned long)&_text, (unsigned long)&_etext,
	468	((unsigned long)&_etext - (unsigned long)&_text) >> 10);
d9b9487a PM	469
d9b9487a PM	470	mem_init_done = 1;
1da177e4 LT	471	}
	472
	473	void free_initmem(void)
	474	{
	475	unsigned long addr;
65463b73	476
1da177e4 LT	477	addr = (unsigned long)(&__init_begin);
	478	for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
	479	ClearPageReserved(virt_to_page(addr));
7835e98b	480	init_page_count(virt_to_page(addr));
1da177e4 LT	481	free_page(addr);
	482	totalram_pages++;
	483	}
07cbb41b PM	484	printk("Freeing unused kernel memory: %ldk freed\n",
	485	((unsigned long)&__init_end -
	486	(unsigned long)&__init_begin) >> 10);
1da177e4 LT	487	}
	488
	489	#ifdef CONFIG_BLK_DEV_INITRD
	490	void free_initrd_mem(unsigned long start, unsigned long end)
	491	{
	492	unsigned long p;
	493	for (p = start; p < end; p += PAGE_SIZE) {
	494	ClearPageReserved(virt_to_page(p));
7835e98b	495	init_page_count(virt_to_page(p));
1da177e4 LT	496	free_page(p);
	497	totalram_pages++;
	498	}
2de212eb	499	printk("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
1da177e4 LT	500	}
1da177e4 LT	501	#endif
33d63bd8 PM	502
33d63bd8 PM	503	#ifdef CONFIG_MEMORY_HOTPLUG
33d63bd8 PM	504	int arch_add_memory(int nid, u64 start, u64 size)
	505	{
	506	pg_data_t *pgdat;
	507	unsigned long start_pfn = start >> PAGE_SHIFT;
	508	unsigned long nr_pages = size >> PAGE_SHIFT;
	509	int ret;
	510
	511	pgdat = NODE_DATA(nid);
	512
	513	/* We only have ZONE_NORMAL, so this is easy.. */
c04fc586 GH	514	ret = __add_pages(nid, pgdat->node_zones + ZONE_NORMAL,
c04fc586 GH	515	start_pfn, nr_pages);
33d63bd8	516	if (unlikely(ret))
866e6b9e	517	printk("%s: Failed, __add_pages() == %d\n", __func__, ret);
33d63bd8 PM	518
	519	return ret;
	520	}
	521	EXPORT_SYMBOL_GPL(arch_add_memory);
	522
357d5946	523	#ifdef CONFIG_NUMA
33d63bd8 PM	524	int memory_add_physaddr_to_nid(u64 addr)
	525	{
	526	/* Node 0 for now.. */
	527	return 0;
	528	}
	529	EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
	530	#endif
1f69b6af	531
3159e7d6	532	#endif /* CONFIG_MEMORY_HOTPLUG */