/* * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. * * Copyright (C) 1998-2003 Hewlett-Packard Co * David Mosberger-Tang * Stephane Eranian * Copyright (C) 2000, Rohit Seth * Copyright (C) 1999 VA Linux Systems * Copyright (C) 1999 Walt Drummond * Copyright (C) 2003 Silicon Graphics, Inc. All rights reserved. * * Routines used by ia64 machines with contiguous (or virtually contiguous) * memory. */ #include #include #include #include #include #include #include #include #include #ifdef CONFIG_VIRTUAL_MEM_MAP static unsigned long max_gap; #endif /** * show_mem - display a memory statistics summary * * Just walks the pages in the system and describes where they're allocated. */ void show_mem (void) { int i, total = 0, reserved = 0; int shared = 0, cached = 0; printk(KERN_INFO "Mem-info:\n"); show_free_areas(); printk(KERN_INFO "Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10)); i = max_mapnr; for (i = 0; i < max_mapnr; i++) { if (!pfn_valid(i)) { #ifdef CONFIG_VIRTUAL_MEM_MAP if (max_gap < LARGE_GAP) continue; i = vmemmap_find_next_valid_pfn(0, i) - 1; #endif continue; } total++; if (PageReserved(mem_map+i)) reserved++; else if (PageSwapCache(mem_map+i)) cached++; else if (page_count(mem_map + i)) shared += page_count(mem_map + i) - 1; } printk(KERN_INFO "%d pages of RAM\n", total); printk(KERN_INFO "%d reserved pages\n", reserved); printk(KERN_INFO "%d pages shared\n", shared); printk(KERN_INFO "%d pages swap cached\n", cached); printk(KERN_INFO "%ld pages in page table cache\n", pgtable_quicklist_total_size()); } /* physical address where the bootmem map is located */ unsigned long bootmap_start; /** * find_max_pfn - adjust the maximum page number callback * @start: start of range * @end: end of range * @arg: address of pointer to global max_pfn variable * * Passed as a callback function to efi_memmap_walk() to determine the highest * available page frame number in the system. */ int find_max_pfn (unsigned long start, unsigned long end, void *arg) { unsigned long *max_pfnp = arg, pfn; pfn = (PAGE_ALIGN(end - 1) - PAGE_OFFSET) >> PAGE_SHIFT; if (pfn > *max_pfnp) *max_pfnp = pfn; return 0; } /** * find_bootmap_location - callback to find a memory area for the bootmap * @start: start of region * @end: end of region * @arg: unused callback data * * Find a place to put the bootmap and return its starting address in * bootmap_start. This address must be page-aligned. */ static int __init find_bootmap_location (unsigned long start, unsigned long end, void *arg) { unsigned long needed = *(unsigned long *)arg; unsigned long range_start, range_end, free_start; int i; #if IGNORE_PFN0 if (start == PAGE_OFFSET) { start += PAGE_SIZE; if (start >= end) return 0; } #endif free_start = PAGE_OFFSET; for (i = 0; i < num_rsvd_regions; i++) { range_start = max(start, free_start); range_end = min(end, rsvd_region[i].start & PAGE_MASK); free_start = PAGE_ALIGN(rsvd_region[i].end); if (range_end <= range_start) continue; /* skip over empty range */ if (range_end - range_start >= needed) { bootmap_start = __pa(range_start); return -1; /* done */ } /* nothing more available in this segment */ if (range_end == end) return 0; } return 0; } /** * find_memory - setup memory map * * Walk the EFI memory map and find usable memory for the system, taking * into account reserved areas. */ void __init find_memory (void) { unsigned long bootmap_size; reserve_memory(); /* first find highest page frame number */ max_pfn = 0; efi_memmap_walk(find_max_pfn, &max_pfn); /* how many bytes to cover all the pages */ bootmap_size = bootmem_bootmap_pages(max_pfn) << PAGE_SHIFT; /* look for a location to hold the bootmap */ bootmap_start = ~0UL; efi_memmap_walk(find_bootmap_location, &bootmap_size); if (bootmap_start == ~0UL) panic("Cannot find %ld bytes for bootmap\n", bootmap_size); bootmap_size = init_bootmem(bootmap_start >> PAGE_SHIFT, max_pfn); /* Free all available memory, then mark bootmem-map as being in use. */ efi_memmap_walk(filter_rsvd_memory, free_bootmem); reserve_bootmem(bootmap_start, bootmap_size); find_initrd(); #ifdef CONFIG_CRASH_DUMP /* If we are doing a crash dump, we still need to know the real mem * size before original memory map is * reset. */ saved_max_pfn = max_pfn; #endif } #ifdef CONFIG_SMP /** * per_cpu_init - setup per-cpu variables * * Allocate and setup per-cpu data areas. */ void * __cpuinit per_cpu_init (void) { void *cpu_data; int cpu; static int first_time=1; /* * get_free_pages() cannot be used before cpu_init() done. BSP * allocates "NR_CPUS" pages for all CPUs to avoid that AP calls * get_zeroed_page(). */ if (first_time) { first_time=0; cpu_data = __alloc_bootmem(PERCPU_PAGE_SIZE * NR_CPUS, PERCPU_PAGE_SIZE, __pa(MAX_DMA_ADDRESS)); for (cpu = 0; cpu < NR_CPUS; cpu++) { memcpy(cpu_data, __phys_per_cpu_start, __per_cpu_end - __per_cpu_start); __per_cpu_offset[cpu] = (char *) cpu_data - __per_cpu_start; cpu_data += PERCPU_PAGE_SIZE; per_cpu(local_per_cpu_offset, cpu) = __per_cpu_offset[cpu]; } } return __per_cpu_start + __per_cpu_offset[smp_processor_id()]; } #endif /* CONFIG_SMP */ static int count_pages (u64 start, u64 end, void *arg) { unsigned long *count = arg; *count += (end - start) >> PAGE_SHIFT; return 0; } /* * Set up the page tables. */ void __init paging_init (void) { unsigned long max_dma; unsigned long max_zone_pfns[MAX_NR_ZONES]; num_physpages = 0; efi_memmap_walk(count_pages, &num_physpages); max_dma = virt_to_phys((void *) MAX_DMA_ADDRESS) >> PAGE_SHIFT; memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); max_zone_pfns[ZONE_DMA] = max_dma; max_zone_pfns[ZONE_NORMAL] = max_low_pfn; #ifdef CONFIG_VIRTUAL_MEM_MAP efi_memmap_walk(register_active_ranges, NULL); efi_memmap_walk(find_largest_hole, (u64 *)&max_gap); if (max_gap < LARGE_GAP) { vmem_map = (struct page *) 0; free_area_init_nodes(max_zone_pfns); } else { unsigned long map_size; /* allocate virtual_mem_map */ map_size = PAGE_ALIGN(ALIGN(max_low_pfn, MAX_ORDER_NR_PAGES) * sizeof(struct page)); vmalloc_end -= map_size; vmem_map = (struct page *) vmalloc_end; efi_memmap_walk(create_mem_map_page_table, NULL); /* * alloc_node_mem_map makes an adjustment for mem_map * which isn't compatible with vmem_map. */ NODE_DATA(0)->node_mem_map = vmem_map + find_min_pfn_with_active_regions(); free_area_init_nodes(max_zone_pfns); printk("Virtual mem_map starts at 0x%p\n", mem_map); } #else /* !CONFIG_VIRTUAL_MEM_MAP */ add_active_range(0, 0, max_low_pfn); free_area_init_nodes(max_zone_pfns); #endif /* !CONFIG_VIRTUAL_MEM_MAP */ zero_page_memmap_ptr = virt_to_page(ia64_imva(empty_zero_page)); }