/* * 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]; #ifdef CONFIG_SUPERH32 /* * Handle trivial transitions between cached and uncached * segments, making use of the 1:1 mapping relationship in * 512MB lowmem. * * This is the offset of the uncached section from its cached alias. * Default value only valid in 29 bit mode, in 32bit mode will be * overridden in pmb_init. */ unsigned long cached_to_uncached = P2SEG - P1SEG; #endif #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); } 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; int pgd_idx; unsigned long vaddr; vaddr = start & PMD_MASK; end = (end + PMD_SIZE - 1) & PMD_MASK; pgd_idx = pgd_index(vaddr); pgd = pgd_base + pgd_idx; for ( ; (pgd_idx < PTRS_PER_PGD) && (vaddr != end); pgd++, pgd_idx++) { BUG_ON(pgd_none(*pgd)); pud = pud_offset(pgd, 0); BUG_ON(pud_none(*pud)); pmd = pmd_offset(pud, 0); if (!pmd_present(*pmd)) { pte_t *pte_table; pte_table = (pte_t *)alloc_bootmem_low_pages(PAGE_SIZE); pmd_populate_kernel(&init_mm, pmd, pte_table); } vaddr += PMD_SIZE; } } #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); /* 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(). */ page_table_range_init(FIXADDR_START, FIXADDR_TOP, 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_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); #ifdef CONFIG_SUPERH32 /* Set up the uncached fixmap */ set_fixmap_nocache(FIX_UNCACHED, __pa(&__uncached_start)); #endif } static struct kcore_list kcore_mem, kcore_vmalloc; int after_bootmem = 0; 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); after_bootmem = 1; 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 #if THREAD_SHIFT < PAGE_SHIFT static struct kmem_cache *thread_info_cache; struct thread_info *alloc_thread_info(struct task_struct *tsk) { struct thread_info *ti; ti = kmem_cache_alloc(thread_info_cache, GFP_KERNEL); if (unlikely(ti == NULL)) return NULL; #ifdef CONFIG_DEBUG_STACK_USAGE memset(ti, 0, THREAD_SIZE); #endif return ti; } void free_thread_info(struct thread_info *ti) { kmem_cache_free(thread_info_cache, ti); } void thread_info_cache_init(void) { thread_info_cache = kmem_cache_create("thread_info", THREAD_SIZE, THREAD_SIZE, 0, NULL); BUG_ON(thread_info_cache == NULL); } #endif /* THREAD_SHIFT < PAGE_SHIFT */ #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(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 */