[linux-2.6-block.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/memblock.h>
#include <linux/proc_fs.h>
#include <linux/pagemap.h>
#include <linux/percpu.h>
#include <linux/io.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 = memblock_alloc(PAGE_SIZE, 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 = memblock_alloc(PAGE_SIZE, 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));
#endif

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

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

	/* 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_memblock(memory, reg) {
		int nid = memblock_get_region_node(reg);

		memory_present(nid, memblock_region_memory_base_pfn(reg),
			memblock_region_memory_end_pfn(reg));
	}
	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;

	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));
	max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
	free_area_init_nodes(max_zone_pfns);
}

unsigned int mem_init_done = 0;

void __init mem_init(void)
{
	pg_data_t *pgdat;

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

	memblock_free_all();

	/* 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, struct vmem_altmap *altmap,
		bool want_memblock)
{
	unsigned long start_pfn = PFN_DOWN(start);
	unsigned long nr_pages = size >> PAGE_SHIFT;
	int ret;

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

	return ret;
}

#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, struct vmem_altmap *altmap)
{
	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, altmap);
	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>
57c8a661	14	#include <linux/memblock.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>
94c28510	19	#include <linux/dma-mapping.h>
f7be3455	20	#include <linux/export.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	30
1da177e4	31	pgd_t swapper_pg_dir[PTRS_PER_PGD];
c6feb614	32
19d8f84f PM	33	void __init generic_mem_init(void)
19d8f84f PM	34	{
95f72d1e	35	memblock_add(__MEMORY_START, __MEMORY_SIZE);
19d8f84f PM	36	}
19d8f84f PM	37
4bc277ac PM	38	void __init __weak plat_mem_setup(void)
	39	{
	40	/* Nothing to see here, move along. */
	41	}
	42
11cbb70e	43	#ifdef CONFIG_MMU
07cad4dc	44	static pte_t *__get_pte_phys(unsigned long addr)
1da177e4 LT	45	{
1da177e4 LT	46	pgd_t *pgd;
26ff6c11	47	pud_t *pud;
1da177e4	48	pmd_t *pmd;
1da177e4	49
99a596f9	50	pgd = pgd_offset_k(addr);
1da177e4 LT	51	if (pgd_none(*pgd)) {
1da177e4 LT	52	pgd_ERROR(*pgd);
07cad4dc	53	return NULL;
1da177e4 LT	54	}
1da177e4 LT	55
99a596f9 SM	56	pud = pud_alloc(NULL, pgd, addr);
	57	if (unlikely(!pud)) {
	58	pud_ERROR(*pud);
07cad4dc	59	return NULL;
26ff6c11 PM	60	}
26ff6c11 PM	61
99a596f9 SM	62	pmd = pmd_alloc(NULL, pud, addr);
	63	if (unlikely(!pmd)) {
	64	pmd_ERROR(*pmd);
07cad4dc	65	return NULL;
1da177e4 LT	66	}
1da177e4 LT	67
598ee698	68	return pte_offset_kernel(pmd, addr);
07cad4dc MF	69	}
	70
	71	static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot)
	72	{
	73	pte_t *pte;
	74
	75	pte = __get_pte_phys(addr);
1da177e4 LT	76	if (!pte_none(*pte)) {
	77	pte_ERROR(*pte);
	78	return;
	79	}
	80
	81	set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, prot));
997d0030	82	local_flush_tlb_one(get_asid(), addr);
07cad4dc MF	83
	84	if (pgprot_val(prot) & _PAGE_WIRED)
	85	tlb_wire_entry(NULL, addr, *pte);
	86	}
	87
	88	static void clear_pte_phys(unsigned long addr, pgprot_t prot)
	89	{
	90	pte_t *pte;
	91
	92	pte = __get_pte_phys(addr);
	93
	94	if (pgprot_val(prot) & _PAGE_WIRED)
	95	tlb_unwire_entry();
	96
	97	set_pte(pte, pfn_pte(0, __pgprot(0)));
	98	local_flush_tlb_one(get_asid(), addr);
1da177e4 LT	99	}
1da177e4 LT	100
1da177e4 LT	101	void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot)
	102	{
	103	unsigned long address = __fix_to_virt(idx);
	104
	105	if (idx >= __end_of_fixed_addresses) {
	106	BUG();
	107	return;
	108	}
	109
	110	set_pte_phys(address, phys, prot);
	111	}
2adb4e10	112
07cad4dc MF	113	void __clear_fixmap(enum fixed_addresses idx, pgprot_t prot)
	114	{
	115	unsigned long address = __fix_to_virt(idx);
	116
	117	if (idx >= __end_of_fixed_addresses) {
	118	BUG();
	119	return;
	120	}
	121
	122	clear_pte_phys(address, prot);
	123	}
	124
598ee698 PM	125	static pmd_t * __init one_md_table_init(pud_t *pud)
	126	{
	127	if (pud_none(*pud)) {
	128	pmd_t *pmd;
	129
15c3c114	130	pmd = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
598ee698 PM	131	pud_populate(&init_mm, pud, pmd);
	132	BUG_ON(pmd != pmd_offset(pud, 0));
	133	}
	134
	135	return pmd_offset(pud, 0);
	136	}
	137
	138	static pte_t * __init one_page_table_init(pmd_t *pmd)
	139	{
	140	if (pmd_none(*pmd)) {
	141	pte_t *pte;
	142
15c3c114	143	pte = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
598ee698 PM	144	pmd_populate_kernel(&init_mm, pmd, pte);
	145	BUG_ON(pte != pte_offset_kernel(pmd, 0));
	146	}
	147
	148	return pte_offset_kernel(pmd, 0);
	149	}
	150
	151	static pte_t * __init page_table_kmap_check(pte_t pte, pmd_t pmd,
	152	unsigned long vaddr, pte_t *lastpte)
	153	{
	154	return pte;
	155	}
	156
2adb4e10 SM	157	void __init page_table_range_init(unsigned long start, unsigned long end,
	158	pgd_t *pgd_base)
	159	{
	160	pgd_t *pgd;
	161	pud_t *pud;
	162	pmd_t *pmd;
598ee698	163	pte_t *pte = NULL;
0906a3ad	164	int i, j, k;
2adb4e10 SM	165	unsigned long vaddr;
2adb4e10 SM	166
0906a3ad PM	167	vaddr = start;
	168	i = __pgd_offset(vaddr);
	169	j = __pud_offset(vaddr);
	170	k = __pmd_offset(vaddr);
	171	pgd = pgd_base + i;
	172
	173	for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) {
	174	pud = (pud_t *)pgd;
	175	for ( ; (j < PTRS_PER_PUD) && (vaddr != end); pud++, j++) {
598ee698 PM	176	pmd = one_md_table_init(pud);
598ee698 PM	177	#ifndef __PAGETABLE_PMD_FOLDED
5d9b4b19 MF	178	pmd += k;
5d9b4b19 MF	179	#endif
0906a3ad	180	for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) {
598ee698 PM	181	pte = page_table_kmap_check(one_page_table_init(pmd),
598ee698 PM	182	pmd, vaddr, pte);
0906a3ad PM	183	vaddr += PMD_SIZE;
	184	}
	185	k = 0;
2adb4e10	186	}
0906a3ad	187	j = 0;
2adb4e10 SM	188	}
2adb4e10 SM	189	}
11cbb70e	190	#endif /* CONFIG_MMU */
1da177e4	191
4bc277ac PM	192	void __init allocate_pgdat(unsigned int nid)
	193	{
	194	unsigned long start_pfn, end_pfn;
	195	#ifdef CONFIG_NEED_MULTIPLE_NODES
	196	unsigned long phys;
	197	#endif
	198
	199	get_pfn_range_for_nid(nid, &start_pfn, &end_pfn);
	200
	201	#ifdef CONFIG_NEED_MULTIPLE_NODES
95f72d1e	202	phys = __memblock_alloc_base(sizeof(struct pglist_data),
4bc277ac PM	203	SMP_CACHE_BYTES, end_pfn << PAGE_SHIFT);
	204	/* Retry with all of system memory */
	205	if (!phys)
95f72d1e YL	206	phys = __memblock_alloc_base(sizeof(struct pglist_data),
95f72d1e YL	207	SMP_CACHE_BYTES, memblock_end_of_DRAM());
4bc277ac PM	208	if (!phys)
	209	panic("Can't allocate pgdat for node %d\n", nid);
	210
	211	NODE_DATA(nid) = __va(phys);
	212	memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
4bc277ac PM	213	#endif
	214
	215	NODE_DATA(nid)->node_start_pfn = start_pfn;
	216	NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn;
	217	}
	218
4bc277ac PM	219	static void __init do_init_bootmem(void)
4bc277ac PM	220	{
64106ca6	221	struct memblock_region *reg;
4bc277ac PM	222
4bc277ac PM	223	/* Add active regions with valid PFNs. */
64106ca6	224	for_each_memblock(memory, reg) {
4bc277ac	225	unsigned long start_pfn, end_pfn;
c7fc2de0 YL	226	start_pfn = memblock_region_memory_base_pfn(reg);
c7fc2de0 YL	227	end_pfn = memblock_region_memory_end_pfn(reg);
4bc277ac PM	228	__add_active_range(0, start_pfn, end_pfn);
	229	}
	230
	231	/* All of system RAM sits in node 0 for the non-NUMA case */
	232	allocate_pgdat(0);
	233	node_set_online(0);
	234
	235	plat_mem_setup();
	236
ac21fc2d RH	237	for_each_memblock(memory, reg) {
ac21fc2d RH	238	int nid = memblock_get_region_node(reg);
4bc277ac	239
ac21fc2d RH	240	memory_present(nid, memblock_region_memory_base_pfn(reg),
	241	memblock_region_memory_end_pfn(reg));
	242	}
4bc277ac PM	243	sparse_init();
	244	}
	245
	246	static void __init early_reserve_mem(void)
	247	{
	248	unsigned long start_pfn;
e66ac3f2 SH	249	u32 zero_base = (u32)__MEMORY_START + (u32)PHYSICAL_OFFSET;
e66ac3f2 SH	250	u32 start = zero_base + (u32)CONFIG_ZERO_PAGE_OFFSET;
4bc277ac PM	251
	252	/*
	253	* Partially used pages are not usable - thus
	254	* we are rounding upwards:
	255	*/
	256	start_pfn = PFN_UP(__pa(_end));
	257
	258	/*
	259	* Reserve the kernel text and Reserve the bootmem bitmap. We do
	260	* this in two steps (first step was init_bootmem()), because
	261	* this catches the (definitely buggy) case of us accidentally
	262	* initializing the bootmem allocator with an invalid RAM area.
	263	*/
e66ac3f2	264	memblock_reserve(start, (PFN_PHYS(start_pfn) + PAGE_SIZE - 1) - start);
4bc277ac PM	265
	266	/*
	267	* Reserve physical pages below CONFIG_ZERO_PAGE_OFFSET.
	268	*/
	269	if (CONFIG_ZERO_PAGE_OFFSET != 0)
e66ac3f2	270	memblock_reserve(zero_base, CONFIG_ZERO_PAGE_OFFSET);
4bc277ac PM	271
	272	/*
	273	* Handle additional early reservations
	274	*/
	275	check_for_initrd();
	276	reserve_crashkernel();
	277	}
	278
1da177e4 LT	279	void __init paging_init(void)
1da177e4 LT	280	{
2de212eb	281	unsigned long max_zone_pfns[MAX_NR_ZONES];
0906a3ad	282	unsigned long vaddr, end;
1da177e4	283
4bc277ac PM	284	sh_mv.mv_mem_init();
	285
	286	early_reserve_mem();
	287
2f599861 PM	288	/*
	289	* Once the early reservations are out of the way, give the
	290	* platforms a chance to kick out some memory.
	291	*/
	292	if (sh_mv.mv_mem_reserve)
	293	sh_mv.mv_mem_reserve();
	294
95f72d1e	295	memblock_enforce_memory_limit(memory_limit);
1aadc056	296	memblock_allow_resize();
4bc277ac	297
95f72d1e	298	memblock_dump_all();
4bc277ac PM	299
	300	/*
	301	* Determine low and high memory ranges:
	302	*/
95f72d1e	303	max_low_pfn = max_pfn = memblock_end_of_DRAM() >> PAGE_SHIFT;
4bc277ac PM	304	min_low_pfn = __MEMORY_START >> PAGE_SHIFT;
	305
	306	nodes_clear(node_online_map);
	307
	308	memory_start = (unsigned long)__va(__MEMORY_START);
95f72d1e	309	memory_end = memory_start + (memory_limit ?: memblock_phys_mem_size());
4bc277ac PM	310
	311	uncached_init();
	312	pmb_init();
	313	do_init_bootmem();
	314	ioremap_fixed_init();
	315
01066625 PM	316	/* We don't need to map the kernel through the TLB, as
	317	* it is permanatly mapped using P1. So clear the
	318	* entire pgd. */
	319	memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir));
1da177e4	320
6e4662ff SM	321	/* Set an initial value for the MMU.TTB so we don't have to
	322	* check for a null value. */
	323	set_TTB(swapper_pg_dir);
	324
acca4f4d PM	325	/*
acca4f4d PM	326	* Populate the relevant portions of swapper_pg_dir so that
2adb4e10	327	* we can use the fixmap entries without calling kmalloc.
acca4f4d PM	328	* pte's will be filled in by __set_fixmap().
	329	*/
	330	vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
0906a3ad PM	331	end = (FIXADDR_TOP + PMD_SIZE - 1) & PMD_MASK;
0906a3ad PM	332	page_table_range_init(vaddr, end, swapper_pg_dir);
acca4f4d PM	333
acca4f4d PM	334	kmap_coherent_init();
2adb4e10	335
2de212eb	336	memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
ac21fc2d	337	max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
2de212eb	338	free_area_init_nodes(max_zone_pfns);
1da177e4 LT	339	}
1da177e4 LT	340
d9b9487a PM	341	unsigned int mem_init_done = 0;
d9b9487a PM	342
1da177e4 LT	343	void __init mem_init(void)
1da177e4 LT	344	{
da61efcf	345	pg_data_t *pgdat;
1da177e4	346
2de212eb	347	high_memory = NULL;
e3a466b2 JL	348	for_each_online_pgdat(pgdat)
	349	high_memory = max_t(void *, high_memory,
	350	__va(pgdat_end_pfn(pgdat) << PAGE_SHIFT));
2de212eb	351
c6ffc5ca	352	memblock_free_all();
1da177e4	353
37443ef3 PM	354	/* Set this up early, so we can take care of the zero page */
	355	cpu_cache_init();
	356
1da177e4 LT	357	/* clear the zero-page */
	358	memset(empty_zero_page, 0, PAGE_SIZE);
	359	__flush_wback_region(empty_zero_page, PAGE_SIZE);
	360
35f99c0d PM	361	vsyscall_init();
35f99c0d PM	362
da61efcf JL	363	mem_init_print_info(NULL);
da61efcf JL	364	pr_info("virtual kernel memory layout:\n"
35f99c0d PM	365	" fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n"
	366	#ifdef CONFIG_HIGHMEM
	367	" pkmap : 0x%08lx - 0x%08lx (%4ld kB)\n"
	368	#endif
	369	" vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n"
3125ee72	370	" lowmem : 0x%08lx - 0x%08lx (%4ld MB) (cached)\n"
b0f3ae03	371	#ifdef CONFIG_UNCACHED_MAPPING
3125ee72	372	" : 0x%08lx - 0x%08lx (%4ld MB) (uncached)\n"
b0f3ae03	373	#endif
35f99c0d PM	374	" .init : 0x%08lx - 0x%08lx (%4ld kB)\n"
	375	" .data : 0x%08lx - 0x%08lx (%4ld kB)\n"
	376	" .text : 0x%08lx - 0x%08lx (%4ld kB)\n",
	377	FIXADDR_START, FIXADDR_TOP,
	378	(FIXADDR_TOP - FIXADDR_START) >> 10,
	379
	380	#ifdef CONFIG_HIGHMEM
	381	PKMAP_BASE, PKMAP_BASE+LAST_PKMAP*PAGE_SIZE,
	382	(LAST_PKMAP*PAGE_SIZE) >> 10,
	383	#endif
	384
	385	(unsigned long)VMALLOC_START, VMALLOC_END,
	386	(VMALLOC_END - VMALLOC_START) >> 20,
	387
	388	(unsigned long)memory_start, (unsigned long)high_memory,
	389	((unsigned long)high_memory - (unsigned long)memory_start) >> 20,
	390
b0f3ae03	391	#ifdef CONFIG_UNCACHED_MAPPING
9edef286	392	uncached_start, uncached_end, uncached_size >> 20,
b0f3ae03	393	#endif
3125ee72	394
35f99c0d PM	395	(unsigned long)&__init_begin, (unsigned long)&__init_end,
	396	((unsigned long)&__init_end -
	397	(unsigned long)&__init_begin) >> 10,
	398
	399	(unsigned long)&_etext, (unsigned long)&_edata,
	400	((unsigned long)&_edata - (unsigned long)&_etext) >> 10,
	401
	402	(unsigned long)&_text, (unsigned long)&_etext,
	403	((unsigned long)&_etext - (unsigned long)&_text) >> 10);
d9b9487a PM	404
d9b9487a PM	405	mem_init_done = 1;
1da177e4 LT	406	}
	407
	408	void free_initmem(void)
	409	{
dbe67df4	410	free_initmem_default(-1);
1da177e4 LT	411	}
	412
	413	#ifdef CONFIG_BLK_DEV_INITRD
	414	void free_initrd_mem(unsigned long start, unsigned long end)
	415	{
dbe67df4	416	free_reserved_area((void )start, (void )end, -1, "initrd");
1da177e4 LT	417	}
1da177e4 LT	418	#endif
33d63bd8 PM	419
33d63bd8 PM	420	#ifdef CONFIG_MEMORY_HOTPLUG
24e6d5a5 CH	421	int arch_add_memory(int nid, u64 start, u64 size, struct vmem_altmap *altmap,
24e6d5a5 CH	422	bool want_memblock)
33d63bd8	423	{
81cf09ed	424	unsigned long start_pfn = PFN_DOWN(start);
33d63bd8 PM	425	unsigned long nr_pages = size >> PAGE_SHIFT;
	426	int ret;
	427
33d63bd8	428	/* We only have ZONE_NORMAL, so this is easy.. */
24e6d5a5	429	ret = __add_pages(nid, start_pfn, nr_pages, altmap, want_memblock);
33d63bd8	430	if (unlikely(ret))
866e6b9e	431	printk("%s: Failed, __add_pages() == %d\n", __func__, ret);
33d63bd8 PM	432
	433	return ret;
	434	}
33d63bd8	435
357d5946	436	#ifdef CONFIG_NUMA
33d63bd8 PM	437	int memory_add_physaddr_to_nid(u64 addr)
	438	{
	439	/* Node 0 for now.. */
	440	return 0;
	441	}
	442	EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
	443	#endif
1f69b6af	444
24d335ca	445	#ifdef CONFIG_MEMORY_HOTREMOVE
da024512	446	int arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap)
24d335ca	447	{
81cf09ed	448	unsigned long start_pfn = PFN_DOWN(start);
24d335ca WC	449	unsigned long nr_pages = size >> PAGE_SHIFT;
	450	struct zone *zone;
	451	int ret;
	452
	453	zone = page_zone(pfn_to_page(start_pfn));
da024512	454	ret = __remove_pages(zone, start_pfn, nr_pages, altmap);
24d335ca WC	455	if (unlikely(ret))
	456	pr_warn("%s: Failed, __remove_pages() == %d\n", __func__,
	457	ret);
	458
	459	return ret;
	460	}
	461	#endif
3159e7d6	462	#endif /* CONFIG_MEMORY_HOTPLUG */