/* * 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 = p->node_start_pfn + p->node_spanned_pages; 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) { int codesize, datasize, initsize; int nid; iommu_init(); num_physpages = 0; high_memory = NULL; for_each_online_node(nid) { pg_data_t *pgdat = NODE_DATA(nid); void *node_high_memory; num_physpages += pgdat->node_present_pages; if (pgdat->node_spanned_pages) free_all_bootmem_node(pgdat); 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; } /* 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(); codesize = (unsigned long) &_etext - (unsigned long) &_text; datasize = (unsigned long) &_edata - (unsigned long) &_etext; initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, " "%dk data, %dk init)\n", nr_free_pages() << (PAGE_SHIFT-10), num_physpages << (PAGE_SHIFT-10), codesize >> 10, datasize >> 10, initsize >> 10); printk(KERN_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_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 */