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

/*
 * linux/arch/sh/mm/init.c
 *
 *  Copyright (C) 1999  Niibe Yutaka
 *  Copyright (C) 2002 - 2011  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 <linux/export.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>

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;

	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;
	}

	return pte_offset_kernel(pmd, addr);
}

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);
}

static pmd_t * __init one_md_table_init(pud_t *pud)
{
	if (pud_none(*pud)) {
		pmd_t *pmd;

		pmd = alloc_bootmem_pages(PAGE_SIZE);
		pud_populate(&init_mm, pud, pmd);
		BUG_ON(pmd != pmd_offset(pud, 0));
	}

	return pmd_offset(pud, 0);
}

static pte_t * __init one_page_table_init(pmd_t *pmd)
{
	if (pmd_none(*pmd)) {
		pte_t *pte;

		pte = alloc_bootmem_pages(PAGE_SIZE);
		pmd_populate_kernel(&init_mm, pmd, pte);
		BUG_ON(pte != pte_offset_kernel(pmd, 0));
	}

	return pte_offset_kernel(pmd, 0);
}

static pte_t * __init page_table_kmap_check(pte_t *pte, pmd_t *pmd,
					    unsigned long vaddr, pte_t *lastpte)
{
	return pte;
}

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 = NULL;
	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++) {
			pmd = one_md_table_init(pud);
#ifndef __PAGETABLE_PMD_FOLDED
			pmd += k;
#endif
			for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) {
				pte = page_table_kmap_check(one_page_table_init(pmd),
							    pmd, vaddr, pte);
				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 = pgdat_end_pfn(p);

	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_memory_base_pfn(reg);
		end_pfn = memblock_region_memory_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;
	u32 zero_base = (u32)__MEMORY_START + (u32)PHYSICAL_OFFSET;
	u32 start = zero_base + (u32)CONFIG_ZERO_PAGE_OFFSET;

	/*
	 * 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(start, (PFN_PHYS(start_pfn) + PAGE_SIZE - 1) - start);

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

	sh_mv.mv_mem_init();

	early_reserve_mem();

	/*
	 * Once the early reservations are out of the way, give the
	 * platforms a chance to kick out some memory.
	 */
	if (sh_mv.mv_mem_reserve)
		sh_mv.mv_mem_reserve();

	memblock_enforce_memory_limit(memory_limit);
	memblock_allow_resize();

	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)
{
	pg_data_t *pgdat;

	iommu_init();

	high_memory = NULL;
	for_each_online_pgdat(pgdat)
		high_memory = max_t(void *, high_memory,
				    __va(pgdat_end_pfn(pgdat) << PAGE_SHIFT));

	free_all_bootmem();

	/* 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();

	mem_init_print_info(NULL);
	pr_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)
{
	free_initmem_default(-1);
}

#ifdef CONFIG_BLK_DEV_INITRD
void free_initrd_mem(unsigned long start, unsigned long end)
{
	free_reserved_area((void *)start, (void *)end, -1, "initrd");
}
#endif

#ifdef CONFIG_MEMORY_HOTPLUG
int arch_add_memory(int nid, u64 start, u64 size, bool for_device)
{
	pg_data_t *pgdat;
	unsigned long start_pfn = PFN_DOWN(start);
	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_for_memory(nid, start, size, ZONE_NORMAL,
			for_device),
			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

#ifdef CONFIG_MEMORY_HOTREMOVE
int arch_remove_memory(u64 start, u64 size)
{
	unsigned long start_pfn = PFN_DOWN(start);
	unsigned long nr_pages = size >> PAGE_SHIFT;
	struct zone *zone;
	int ret;

	zone = page_zone(pfn_to_page(start_pfn));
	ret = __remove_pages(zone, start_pfn, nr_pages);
	if (unlikely(ret))
		pr_warn("%s: Failed, __remove_pages() == %d\n", __func__,
			ret);

	return ret;
}
#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
2f599861	5	* Copyright (C) 2002 - 2011 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>
f7be3455	21	#include <linux/export.h>
1da177e4	22	#include <asm/mmu_context.h>
4bc277ac	23	#include <asm/mmzone.h>
c77b29db	24	#include <asm/kexec.h>
1da177e4 LT	25	#include <asm/tlb.h>
1da177e4 LT	26	#include <asm/cacheflush.h>
07cbb41b	27	#include <asm/sections.h>
4bc277ac	28	#include <asm/setup.h>
1da177e4	29	#include <asm/cache.h>
b0f3ae03	30	#include <asm/sizes.h>
1da177e4	31
1da177e4	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	49	pmd_t *pmd;
1da177e4	50
99a596f9	51	pgd = pgd_offset_k(addr);
1da177e4 LT	52	if (pgd_none(*pgd)) {
1da177e4 LT	53	pgd_ERROR(*pgd);
07cad4dc	54	return NULL;
1da177e4 LT	55	}
1da177e4 LT	56
99a596f9 SM	57	pud = pud_alloc(NULL, pgd, addr);
	58	if (unlikely(!pud)) {
	59	pud_ERROR(*pud);
07cad4dc	60	return NULL;
26ff6c11 PM	61	}
26ff6c11 PM	62
99a596f9 SM	63	pmd = pmd_alloc(NULL, pud, addr);
	64	if (unlikely(!pmd)) {
	65	pmd_ERROR(*pmd);
07cad4dc	66	return NULL;
1da177e4 LT	67	}
1da177e4 LT	68
598ee698	69	return pte_offset_kernel(pmd, addr);
07cad4dc MF	70	}
	71
	72	static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot)
	73	{
	74	pte_t *pte;
	75
	76	pte = __get_pte_phys(addr);
1da177e4 LT	77	if (!pte_none(*pte)) {
	78	pte_ERROR(*pte);
	79	return;
	80	}
	81
	82	set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, prot));
997d0030	83	local_flush_tlb_one(get_asid(), addr);
07cad4dc MF	84
	85	if (pgprot_val(prot) & _PAGE_WIRED)
	86	tlb_wire_entry(NULL, addr, *pte);
	87	}
	88
	89	static void clear_pte_phys(unsigned long addr, pgprot_t prot)
	90	{
	91	pte_t *pte;
	92
	93	pte = __get_pte_phys(addr);
	94
	95	if (pgprot_val(prot) & _PAGE_WIRED)
	96	tlb_unwire_entry();
	97
	98	set_pte(pte, pfn_pte(0, __pgprot(0)));
	99	local_flush_tlb_one(get_asid(), addr);
1da177e4 LT	100	}
1da177e4 LT	101
1da177e4 LT	102	void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot)
	103	{
	104	unsigned long address = __fix_to_virt(idx);
	105
	106	if (idx >= __end_of_fixed_addresses) {
	107	BUG();
	108	return;
	109	}
	110
	111	set_pte_phys(address, phys, prot);
	112	}
2adb4e10	113
07cad4dc MF	114	void __clear_fixmap(enum fixed_addresses idx, pgprot_t prot)
	115	{
	116	unsigned long address = __fix_to_virt(idx);
	117
	118	if (idx >= __end_of_fixed_addresses) {
	119	BUG();
	120	return;
	121	}
	122
	123	clear_pte_phys(address, prot);
	124	}
	125
598ee698 PM	126	static pmd_t * __init one_md_table_init(pud_t *pud)
	127	{
	128	if (pud_none(*pud)) {
	129	pmd_t *pmd;
	130
	131	pmd = alloc_bootmem_pages(PAGE_SIZE);
	132	pud_populate(&init_mm, pud, pmd);
	133	BUG_ON(pmd != pmd_offset(pud, 0));
	134	}
	135
	136	return pmd_offset(pud, 0);
	137	}
	138
	139	static pte_t * __init one_page_table_init(pmd_t *pmd)
	140	{
	141	if (pmd_none(*pmd)) {
	142	pte_t *pte;
	143
	144	pte = alloc_bootmem_pages(PAGE_SIZE);
	145	pmd_populate_kernel(&init_mm, pmd, pte);
	146	BUG_ON(pte != pte_offset_kernel(pmd, 0));
	147	}
	148
	149	return pte_offset_kernel(pmd, 0);
	150	}
	151
	152	static pte_t * __init page_table_kmap_check(pte_t pte, pmd_t pmd,
	153	unsigned long vaddr, pte_t *lastpte)
	154	{
	155	return pte;
	156	}
	157
2adb4e10 SM	158	void __init page_table_range_init(unsigned long start, unsigned long end,
	159	pgd_t *pgd_base)
	160	{
	161	pgd_t *pgd;
	162	pud_t *pud;
	163	pmd_t *pmd;
598ee698	164	pte_t *pte = NULL;
0906a3ad	165	int i, j, k;
2adb4e10 SM	166	unsigned long vaddr;
2adb4e10 SM	167
0906a3ad PM	168	vaddr = start;
	169	i = __pgd_offset(vaddr);
	170	j = __pud_offset(vaddr);
	171	k = __pmd_offset(vaddr);
	172	pgd = pgd_base + i;
	173
	174	for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) {
	175	pud = (pud_t *)pgd;
	176	for ( ; (j < PTRS_PER_PUD) && (vaddr != end); pud++, j++) {
598ee698 PM	177	pmd = one_md_table_init(pud);
598ee698 PM	178	#ifndef __PAGETABLE_PMD_FOLDED
5d9b4b19 MF	179	pmd += k;
5d9b4b19 MF	180	#endif
0906a3ad	181	for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) {
598ee698 PM	182	pte = page_table_kmap_check(one_page_table_init(pmd),
598ee698 PM	183	pmd, vaddr, pte);
0906a3ad PM	184	vaddr += PMD_SIZE;
	185	}
	186	k = 0;
2adb4e10	187	}
0906a3ad	188	j = 0;
2adb4e10 SM	189	}
2adb4e10 SM	190	}
11cbb70e	191	#endif /* CONFIG_MMU */
1da177e4	192
4bc277ac PM	193	void __init allocate_pgdat(unsigned int nid)
	194	{
	195	unsigned long start_pfn, end_pfn;
	196	#ifdef CONFIG_NEED_MULTIPLE_NODES
	197	unsigned long phys;
	198	#endif
	199
	200	get_pfn_range_for_nid(nid, &start_pfn, &end_pfn);
	201
	202	#ifdef CONFIG_NEED_MULTIPLE_NODES
95f72d1e	203	phys = __memblock_alloc_base(sizeof(struct pglist_data),
4bc277ac PM	204	SMP_CACHE_BYTES, end_pfn << PAGE_SHIFT);
	205	/* Retry with all of system memory */
	206	if (!phys)
95f72d1e YL	207	phys = __memblock_alloc_base(sizeof(struct pglist_data),
95f72d1e YL	208	SMP_CACHE_BYTES, memblock_end_of_DRAM());
4bc277ac PM	209	if (!phys)
	210	panic("Can't allocate pgdat for node %d\n", nid);
	211
	212	NODE_DATA(nid) = __va(phys);
	213	memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
	214
	215	NODE_DATA(nid)->bdata = &bootmem_node_data[nid];
	216	#endif
	217
	218	NODE_DATA(nid)->node_start_pfn = start_pfn;
	219	NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn;
	220	}
	221
	222	static void __init bootmem_init_one_node(unsigned int nid)
	223	{
	224	unsigned long total_pages, paddr;
	225	unsigned long end_pfn;
	226	struct pglist_data *p;
4bc277ac PM	227
	228	p = NODE_DATA(nid);
	229
	230	/* Nothing to do.. */
	231	if (!p->node_spanned_pages)
	232	return;
	233
6408068e	234	end_pfn = pgdat_end_pfn(p);
4bc277ac PM	235
	236	total_pages = bootmem_bootmap_pages(p->node_spanned_pages);
	237
95f72d1e	238	paddr = memblock_alloc(total_pages << PAGE_SHIFT, PAGE_SIZE);
4bc277ac PM	239	if (!paddr)
	240	panic("Can't allocate bootmap for nid[%d]\n", nid);
	241
	242	init_bootmem_node(p, paddr >> PAGE_SHIFT, p->node_start_pfn, end_pfn);
	243
	244	free_bootmem_with_active_regions(nid, end_pfn);
	245
	246	/*
	247	* XXX Handle initial reservations for the system memory node
	248	* only for the moment, we'll refactor this later for handling
	249	* reservations in other nodes.
	250	*/
	251	if (nid == 0) {
64106ca6 BH	252	struct memblock_region *reg;
64106ca6 BH	253
4bc277ac	254	/* Reserve the sections we're already using. */
64106ca6 BH	255	for_each_memblock(reserved, reg) {
	256	reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT);
	257	}
4bc277ac PM	258	}
	259
	260	sparse_memory_present_with_active_regions(nid);
	261	}
	262
	263	static void __init do_init_bootmem(void)
	264	{
64106ca6	265	struct memblock_region *reg;
4bc277ac PM	266	int i;
	267
	268	/* Add active regions with valid PFNs. */
64106ca6	269	for_each_memblock(memory, reg) {
4bc277ac	270	unsigned long start_pfn, end_pfn;
c7fc2de0 YL	271	start_pfn = memblock_region_memory_base_pfn(reg);
c7fc2de0 YL	272	end_pfn = memblock_region_memory_end_pfn(reg);
4bc277ac PM	273	__add_active_range(0, start_pfn, end_pfn);
	274	}
	275
	276	/* All of system RAM sits in node 0 for the non-NUMA case */
	277	allocate_pgdat(0);
	278	node_set_online(0);
	279
	280	plat_mem_setup();
	281
	282	for_each_online_node(i)
	283	bootmem_init_one_node(i);
	284
	285	sparse_init();
	286	}
	287
	288	static void __init early_reserve_mem(void)
	289	{
	290	unsigned long start_pfn;
e66ac3f2 SH	291	u32 zero_base = (u32)__MEMORY_START + (u32)PHYSICAL_OFFSET;
e66ac3f2 SH	292	u32 start = zero_base + (u32)CONFIG_ZERO_PAGE_OFFSET;
4bc277ac PM	293
	294	/*
	295	* Partially used pages are not usable - thus
	296	* we are rounding upwards:
	297	*/
	298	start_pfn = PFN_UP(__pa(_end));
	299
	300	/*
	301	* Reserve the kernel text and Reserve the bootmem bitmap. We do
	302	* this in two steps (first step was init_bootmem()), because
	303	* this catches the (definitely buggy) case of us accidentally
	304	* initializing the bootmem allocator with an invalid RAM area.
	305	*/
e66ac3f2	306	memblock_reserve(start, (PFN_PHYS(start_pfn) + PAGE_SIZE - 1) - start);
4bc277ac PM	307
	308	/*
	309	* Reserve physical pages below CONFIG_ZERO_PAGE_OFFSET.
	310	*/
	311	if (CONFIG_ZERO_PAGE_OFFSET != 0)
e66ac3f2	312	memblock_reserve(zero_base, CONFIG_ZERO_PAGE_OFFSET);
4bc277ac PM	313
	314	/*
	315	* Handle additional early reservations
	316	*/
	317	check_for_initrd();
	318	reserve_crashkernel();
	319	}
	320
1da177e4 LT	321	void __init paging_init(void)
1da177e4 LT	322	{
2de212eb	323	unsigned long max_zone_pfns[MAX_NR_ZONES];
0906a3ad	324	unsigned long vaddr, end;
01066625	325	int nid;
1da177e4	326
4bc277ac PM	327	sh_mv.mv_mem_init();
	328
	329	early_reserve_mem();
	330
2f599861 PM	331	/*
	332	* Once the early reservations are out of the way, give the
	333	* platforms a chance to kick out some memory.
	334	*/
	335	if (sh_mv.mv_mem_reserve)
	336	sh_mv.mv_mem_reserve();
	337
95f72d1e	338	memblock_enforce_memory_limit(memory_limit);
1aadc056	339	memblock_allow_resize();
4bc277ac	340
95f72d1e	341	memblock_dump_all();
4bc277ac PM	342
	343	/*
	344	* Determine low and high memory ranges:
	345	*/
95f72d1e	346	max_low_pfn = max_pfn = memblock_end_of_DRAM() >> PAGE_SHIFT;
4bc277ac PM	347	min_low_pfn = __MEMORY_START >> PAGE_SHIFT;
	348
	349	nodes_clear(node_online_map);
	350
	351	memory_start = (unsigned long)__va(__MEMORY_START);
95f72d1e	352	memory_end = memory_start + (memory_limit ?: memblock_phys_mem_size());
4bc277ac PM	353
	354	uncached_init();
	355	pmb_init();
	356	do_init_bootmem();
	357	ioremap_fixed_init();
	358
01066625 PM	359	/* We don't need to map the kernel through the TLB, as
	360	* it is permanatly mapped using P1. So clear the
	361	* entire pgd. */
	362	memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir));
1da177e4	363
6e4662ff SM	364	/* Set an initial value for the MMU.TTB so we don't have to
	365	* check for a null value. */
	366	set_TTB(swapper_pg_dir);
	367
acca4f4d PM	368	/*
acca4f4d PM	369	* Populate the relevant portions of swapper_pg_dir so that
2adb4e10	370	* we can use the fixmap entries without calling kmalloc.
acca4f4d PM	371	* pte's will be filled in by __set_fixmap().
	372	*/
	373	vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
0906a3ad PM	374	end = (FIXADDR_TOP + PMD_SIZE - 1) & PMD_MASK;
0906a3ad PM	375	page_table_range_init(vaddr, end, swapper_pg_dir);
acca4f4d PM	376
acca4f4d PM	377	kmap_coherent_init();
2adb4e10	378
2de212eb PM	379	memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
2de212eb PM	380
01066625 PM	381	for_each_online_node(nid) {
01066625 PM	382	pg_data_t *pgdat = NODE_DATA(nid);
01066625 PM	383	unsigned long low, start_pfn;
01066625 PM	384
3560e249	385	start_pfn = pgdat->bdata->node_min_pfn;
01066625 PM	386	low = pgdat->bdata->node_low_pfn;
01066625 PM	387
2de212eb PM	388	if (max_zone_pfns[ZONE_NORMAL] < low)
2de212eb PM	389	max_zone_pfns[ZONE_NORMAL] = low;
01066625 PM	390
	391	printk("Node %u: start_pfn = 0x%lx, low = 0x%lx\n",
	392	nid, start_pfn, low);
01066625	393	}
2de212eb PM	394
2de212eb PM	395	free_area_init_nodes(max_zone_pfns);
1da177e4 LT	396	}
1da177e4 LT	397
94c28510 PM	398	/*
	399	* Early initialization for any I/O MMUs we might have.
	400	*/
	401	static void __init iommu_init(void)
	402	{
	403	no_iommu_init();
	404	}
	405
d9b9487a PM	406	unsigned int mem_init_done = 0;
d9b9487a PM	407
1da177e4 LT	408	void __init mem_init(void)
1da177e4 LT	409	{
da61efcf	410	pg_data_t *pgdat;
1da177e4	411
94c28510 PM	412	iommu_init();
94c28510 PM	413
2de212eb	414	high_memory = NULL;
e3a466b2 JL	415	for_each_online_pgdat(pgdat)
	416	high_memory = max_t(void *, high_memory,
	417	__va(pgdat_end_pfn(pgdat) << PAGE_SHIFT));
2de212eb	418
e3a466b2	419	free_all_bootmem();
1da177e4	420
37443ef3 PM	421	/* Set this up early, so we can take care of the zero page */
	422	cpu_cache_init();
	423
1da177e4 LT	424	/* clear the zero-page */
	425	memset(empty_zero_page, 0, PAGE_SIZE);
	426	__flush_wback_region(empty_zero_page, PAGE_SIZE);
	427
35f99c0d PM	428	vsyscall_init();
35f99c0d PM	429
da61efcf JL	430	mem_init_print_info(NULL);
da61efcf JL	431	pr_info("virtual kernel memory layout:\n"
35f99c0d PM	432	" fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n"
	433	#ifdef CONFIG_HIGHMEM
	434	" pkmap : 0x%08lx - 0x%08lx (%4ld kB)\n"
	435	#endif
	436	" vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n"
3125ee72	437	" lowmem : 0x%08lx - 0x%08lx (%4ld MB) (cached)\n"
b0f3ae03	438	#ifdef CONFIG_UNCACHED_MAPPING
3125ee72	439	" : 0x%08lx - 0x%08lx (%4ld MB) (uncached)\n"
b0f3ae03	440	#endif
35f99c0d PM	441	" .init : 0x%08lx - 0x%08lx (%4ld kB)\n"
	442	" .data : 0x%08lx - 0x%08lx (%4ld kB)\n"
	443	" .text : 0x%08lx - 0x%08lx (%4ld kB)\n",
	444	FIXADDR_START, FIXADDR_TOP,
	445	(FIXADDR_TOP - FIXADDR_START) >> 10,
	446
	447	#ifdef CONFIG_HIGHMEM
	448	PKMAP_BASE, PKMAP_BASE+LAST_PKMAP*PAGE_SIZE,
	449	(LAST_PKMAP*PAGE_SIZE) >> 10,
	450	#endif
	451
	452	(unsigned long)VMALLOC_START, VMALLOC_END,
	453	(VMALLOC_END - VMALLOC_START) >> 20,
	454
	455	(unsigned long)memory_start, (unsigned long)high_memory,
	456	((unsigned long)high_memory - (unsigned long)memory_start) >> 20,
	457
b0f3ae03	458	#ifdef CONFIG_UNCACHED_MAPPING
9edef286	459	uncached_start, uncached_end, uncached_size >> 20,
b0f3ae03	460	#endif
3125ee72	461
35f99c0d PM	462	(unsigned long)&__init_begin, (unsigned long)&__init_end,
	463	((unsigned long)&__init_end -
	464	(unsigned long)&__init_begin) >> 10,
	465
	466	(unsigned long)&_etext, (unsigned long)&_edata,
	467	((unsigned long)&_edata - (unsigned long)&_etext) >> 10,
	468
	469	(unsigned long)&_text, (unsigned long)&_etext,
	470	((unsigned long)&_etext - (unsigned long)&_text) >> 10);
d9b9487a PM	471
d9b9487a PM	472	mem_init_done = 1;
1da177e4 LT	473	}
	474
	475	void free_initmem(void)
	476	{
dbe67df4	477	free_initmem_default(-1);
1da177e4 LT	478	}
	479
	480	#ifdef CONFIG_BLK_DEV_INITRD
	481	void free_initrd_mem(unsigned long start, unsigned long end)
	482	{
dbe67df4	483	free_reserved_area((void )start, (void )end, -1, "initrd");
1da177e4 LT	484	}
1da177e4 LT	485	#endif
33d63bd8 PM	486
33d63bd8 PM	487	#ifdef CONFIG_MEMORY_HOTPLUG
033fbae9	488	int arch_add_memory(int nid, u64 start, u64 size, bool for_device)
33d63bd8 PM	489	{
33d63bd8 PM	490	pg_data_t *pgdat;
81cf09ed	491	unsigned long start_pfn = PFN_DOWN(start);
33d63bd8 PM	492	unsigned long nr_pages = size >> PAGE_SHIFT;
	493	int ret;
	494
	495	pgdat = NODE_DATA(nid);
	496
	497	/* We only have ZONE_NORMAL, so this is easy.. */
6e90b58b	498	ret = __add_pages(nid, pgdat->node_zones +
033fbae9 DW	499	zone_for_memory(nid, start, size, ZONE_NORMAL,
033fbae9 DW	500	for_device),
6e90b58b	501	start_pfn, nr_pages);
33d63bd8	502	if (unlikely(ret))
866e6b9e	503	printk("%s: Failed, __add_pages() == %d\n", __func__, ret);
33d63bd8 PM	504
	505	return ret;
	506	}
	507	EXPORT_SYMBOL_GPL(arch_add_memory);
	508
357d5946	509	#ifdef CONFIG_NUMA
33d63bd8 PM	510	int memory_add_physaddr_to_nid(u64 addr)
	511	{
	512	/* Node 0 for now.. */
	513	return 0;
	514	}
	515	EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
	516	#endif
1f69b6af	517
24d335ca WC	518	#ifdef CONFIG_MEMORY_HOTREMOVE
	519	int arch_remove_memory(u64 start, u64 size)
	520	{
81cf09ed	521	unsigned long start_pfn = PFN_DOWN(start);
24d335ca WC	522	unsigned long nr_pages = size >> PAGE_SHIFT;
	523	struct zone *zone;
	524	int ret;
	525
	526	zone = page_zone(pfn_to_page(start_pfn));
	527	ret = __remove_pages(zone, start_pfn, nr_pages);
	528	if (unlikely(ret))
	529	pr_warn("%s: Failed, __remove_pages() == %d\n", __func__,
	530	ret);
	531
	532	return ret;
	533	}
	534	#endif
3159e7d6	535	#endif /* CONFIG_MEMORY_HOTPLUG */