Initial import

1 files changed, 534 insertions, 0 deletions

diff --git a/arch/sh/mm/init.c b/arch/sh/mm/init.c
new file mode 100644
index 000000000..2790b6a64
--- /dev/null
+++ b/arch/sh/mm/init.c
@@ -0,0 +1,534 @@
+/*
+ * 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)
+{
+	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_for_memory(nid, start, size, 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
+
+#ifdef CONFIG_MEMORY_HOTREMOVE
+int arch_remove_memory(u64 start, u64 size)
+{
+	unsigned long start_pfn = start >> PAGE_SHIFT;
+	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 */