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[/] [or1k_soc_on_altera_embedded_dev_kit/] [trunk/] [linux-2.6/] [linux-2.6.24/] [arch/] [sh/] [mm/] [init.c] - Rev 17
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/* * linux/arch/sh/mm/init.c * * Copyright (C) 1999 Niibe Yutaka * Copyright (C) 2002 - 2007 Paul Mundt * * Based on linux/arch/i386/mm/init.c: * Copyright (C) 1995 Linus Torvalds */ #include <linux/mm.h> #include <linux/swap.h> #include <linux/init.h> #include <linux/bootmem.h> #include <linux/proc_fs.h> #include <linux/pagemap.h> #include <linux/percpu.h> #include <linux/io.h> #include <asm/mmu_context.h> #include <asm/tlb.h> #include <asm/cacheflush.h> #include <asm/sections.h> #include <asm/cache.h> DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); pgd_t swapper_pg_dir[PTRS_PER_PGD]; void (*copy_page)(void *from, void *to); void (*clear_page)(void *to); void show_mem(void) { int total = 0, reserved = 0, free = 0; int shared = 0, cached = 0, slab = 0; pg_data_t *pgdat; printk("Mem-info:\n"); show_free_areas(); for_each_online_pgdat(pgdat) { unsigned long flags, i; pgdat_resize_lock(pgdat, &flags); for (i = 0; i < pgdat->node_spanned_pages; i++) { struct page *page = pgdat_page_nr(pgdat, i); total++; if (PageReserved(page)) reserved++; else if (PageSwapCache(page)) cached++; else if (PageSlab(page)) slab++; else if (!page_count(page)) free++; else shared += page_count(page) - 1; } pgdat_resize_unlock(pgdat, &flags); } printk("Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10)); printk("%d pages of RAM\n", total); printk("%d free pages\n", free); printk("%d reserved pages\n", reserved); printk("%d slab pages\n", slab); printk("%d pages shared\n", shared); printk("%d pages swap cached\n", cached); printk(KERN_INFO "Total of %ld pages in page table cache\n", quicklist_total_size()); } #ifdef CONFIG_MMU static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot) { pgd_t *pgd; pud_t *pud; pmd_t *pmd; pte_t *pte; pgd = pgd_offset_k(addr); if (pgd_none(*pgd)) { pgd_ERROR(*pgd); return; } pud = pud_alloc(NULL, pgd, addr); if (unlikely(!pud)) { pud_ERROR(*pud); return; } pmd = pmd_alloc(NULL, pud, addr); if (unlikely(!pmd)) { pmd_ERROR(*pmd); return; } pte = pte_offset_kernel(pmd, addr); if (!pte_none(*pte)) { pte_ERROR(*pte); return; } set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, prot)); flush_tlb_one(get_asid(), addr); } /* * As a performance optimization, other platforms preserve the fixmap mapping * across a context switch, we don't presently do this, but this could be done * in a similar fashion as to the wired TLB interface that sh64 uses (by way * of the memory mapped UTLB configuration) -- this unfortunately forces us to * give up a TLB entry for each mapping we want to preserve. While this may be * viable for a small number of fixmaps, it's not particularly useful for * everything and needs to be carefully evaluated. (ie, we may want this for * the vsyscall page). * * XXX: Perhaps add a _PAGE_WIRED flag or something similar that we can pass * in at __set_fixmap() time to determine the appropriate behavior to follow. * * -- PFM. */ void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot) { unsigned long address = __fix_to_virt(idx); if (idx >= __end_of_fixed_addresses) { BUG(); return; } set_pte_phys(address, phys, prot); } #endif /* CONFIG_MMU */ /* * paging_init() sets up the page tables */ void __init paging_init(void) { unsigned long max_zone_pfns[MAX_NR_ZONES]; int nid; /* We don't need to map the kernel through the TLB, as * it is permanatly mapped using P1. So clear the * entire pgd. */ memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir)); /* Set an initial value for the MMU.TTB so we don't have to * check for a null value. */ set_TTB(swapper_pg_dir); 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_boot_start >> PAGE_SHIFT; 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); } static struct kcore_list kcore_mem, kcore_vmalloc; void __init mem_init(void) { int codesize, datasize, initsize; int nid; 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; } /* clear the zero-page */ memset(empty_zero_page, 0, PAGE_SIZE); __flush_wback_region(empty_zero_page, PAGE_SIZE); /* * Setup wrappers for copy/clear_page(), these will get overridden * later in the boot process if a better method is available. */ #ifdef CONFIG_MMU copy_page = copy_page_slow; clear_page = clear_page_slow; #else copy_page = copy_page_nommu; clear_page = clear_page_nommu; #endif codesize = (unsigned long) &_etext - (unsigned long) &_text; datasize = (unsigned long) &_edata - (unsigned long) &_etext; initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT); kclist_add(&kcore_vmalloc, (void *)VMALLOC_START, VMALLOC_END - VMALLOC_START); printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, " "%dk data, %dk init)\n", (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), num_physpages << (PAGE_SHIFT-10), codesize >> 10, datasize >> 10, initsize >> 10); p3_cache_init(); /* Initialize the vDSO */ vsyscall_init(); } void free_initmem(void) { unsigned long addr; addr = (unsigned long)(&__init_begin); for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) { ClearPageReserved(virt_to_page(addr)); init_page_count(virt_to_page(addr)); free_page(addr); totalram_pages++; } printk("Freeing unused kernel memory: %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 void online_page(struct page *page) { ClearPageReserved(page); init_page_count(page); __free_page(page); totalram_pages++; num_physpages++; } 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(pgdat->node_zones + ZONE_NORMAL, start_pfn, nr_pages); if (unlikely(ret)) printk("%s: Failed, __add_pages() == %d\n", __FUNCTION__, 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
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