| /* |
| * linux/arch/arm/mm/init.c |
| * |
| * Copyright (C) 1995-2005 Russell King |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| */ |
| #include <linux/kernel.h> |
| #include <linux/errno.h> |
| #include <linux/swap.h> |
| #include <linux/init.h> |
| #include <linux/bootmem.h> |
| #include <linux/mman.h> |
| #include <linux/nodemask.h> |
| #include <linux/initrd.h> |
| #include <linux/highmem.h> |
| #include <linux/gfp.h> |
| #include <linux/memblock.h> |
| #include <linux/sort.h> |
| |
| #include <asm/mach-types.h> |
| #include <asm/sections.h> |
| #include <asm/setup.h> |
| #include <asm/sizes.h> |
| #include <asm/tlb.h> |
| #include <asm/fixmap.h> |
| |
| #include <asm/mach/arch.h> |
| #include <asm/mach/map.h> |
| |
| #include "mm.h" |
| |
| static unsigned long phys_initrd_start __initdata = 0; |
| static unsigned long phys_initrd_size __initdata = 0; |
| |
| static int __init early_initrd(char *p) |
| { |
| unsigned long start, size; |
| char *endp; |
| |
| start = memparse(p, &endp); |
| if (*endp == ',') { |
| size = memparse(endp + 1, NULL); |
| |
| phys_initrd_start = start; |
| phys_initrd_size = size; |
| } |
| return 0; |
| } |
| early_param("initrd", early_initrd); |
| |
| static int __init parse_tag_initrd(const struct tag *tag) |
| { |
| printk(KERN_WARNING "ATAG_INITRD is deprecated; " |
| "please update your bootloader.\n"); |
| phys_initrd_start = __virt_to_phys(tag->u.initrd.start); |
| phys_initrd_size = tag->u.initrd.size; |
| return 0; |
| } |
| |
| __tagtable(ATAG_INITRD, parse_tag_initrd); |
| |
| static int __init parse_tag_initrd2(const struct tag *tag) |
| { |
| phys_initrd_start = tag->u.initrd.start; |
| phys_initrd_size = tag->u.initrd.size; |
| return 0; |
| } |
| |
| __tagtable(ATAG_INITRD2, parse_tag_initrd2); |
| |
| /* |
| * This keeps memory configuration data used by a couple memory |
| * initialization functions, as well as show_mem() for the skipping |
| * of holes in the memory map. It is populated by arm_add_memory(). |
| */ |
| struct meminfo meminfo; |
| |
| void show_mem(void) |
| { |
| int free = 0, total = 0, reserved = 0; |
| int shared = 0, cached = 0, slab = 0, i; |
| struct meminfo * mi = &meminfo; |
| |
| printk("Mem-info:\n"); |
| show_free_areas(); |
| |
| for_each_bank (i, mi) { |
| struct membank *bank = &mi->bank[i]; |
| unsigned int pfn1, pfn2; |
| struct page *page, *end; |
| |
| pfn1 = bank_pfn_start(bank); |
| pfn2 = bank_pfn_end(bank); |
| |
| page = pfn_to_page(pfn1); |
| end = pfn_to_page(pfn2 - 1) + 1; |
| |
| do { |
| 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; |
| page++; |
| } while (page < end); |
| } |
| |
| 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); |
| } |
| |
| static void __init find_limits(struct meminfo *mi, |
| unsigned long *min, unsigned long *max_low, unsigned long *max_high) |
| { |
| int i; |
| |
| *min = -1UL; |
| *max_low = *max_high = 0; |
| |
| for_each_bank (i, mi) { |
| struct membank *bank = &mi->bank[i]; |
| unsigned long start, end; |
| |
| start = bank_pfn_start(bank); |
| end = bank_pfn_end(bank); |
| |
| if (*min > start) |
| *min = start; |
| if (*max_high < end) |
| *max_high = end; |
| if (bank->highmem) |
| continue; |
| if (*max_low < end) |
| *max_low = end; |
| } |
| } |
| |
| static void __init arm_bootmem_init(struct meminfo *mi, |
| unsigned long start_pfn, unsigned long end_pfn) |
| { |
| struct memblock_region *reg; |
| unsigned int boot_pages; |
| phys_addr_t bitmap; |
| pg_data_t *pgdat; |
| int i; |
| |
| /* |
| * Allocate the bootmem bitmap page. This must be in a region |
| * of memory which has already been mapped. |
| */ |
| boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn); |
| bitmap = memblock_alloc_base(boot_pages << PAGE_SHIFT, L1_CACHE_BYTES, |
| __pfn_to_phys(end_pfn)); |
| |
| /* |
| * Initialise the bootmem allocator, handing the |
| * memory banks over to bootmem. |
| */ |
| node_set_online(0); |
| pgdat = NODE_DATA(0); |
| init_bootmem_node(pgdat, __phys_to_pfn(bitmap), start_pfn, end_pfn); |
| |
| for_each_bank(i, mi) { |
| struct membank *bank = &mi->bank[i]; |
| if (!bank->highmem) |
| free_bootmem(bank_phys_start(bank), bank_phys_size(bank)); |
| } |
| |
| /* |
| * Reserve the memblock reserved regions in bootmem. |
| */ |
| for_each_memblock(reserved, reg) { |
| phys_addr_t start = memblock_region_reserved_base_pfn(reg); |
| phys_addr_t end = memblock_region_reserved_end_pfn(reg); |
| if (start >= start_pfn && end <= end_pfn) |
| reserve_bootmem_node(pgdat, __pfn_to_phys(start), |
| (end - start) << PAGE_SHIFT, |
| BOOTMEM_DEFAULT); |
| } |
| } |
| |
| static void __init arm_bootmem_free(struct meminfo *mi, unsigned long min, |
| unsigned long max_low, unsigned long max_high) |
| { |
| unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES]; |
| int i; |
| |
| /* |
| * initialise the zones. |
| */ |
| memset(zone_size, 0, sizeof(zone_size)); |
| |
| /* |
| * The memory size has already been determined. If we need |
| * to do anything fancy with the allocation of this memory |
| * to the zones, now is the time to do it. |
| */ |
| zone_size[0] = max_low - min; |
| #ifdef CONFIG_HIGHMEM |
| zone_size[ZONE_HIGHMEM] = max_high - max_low; |
| #endif |
| |
| /* |
| * Calculate the size of the holes. |
| * holes = node_size - sum(bank_sizes) |
| */ |
| memcpy(zhole_size, zone_size, sizeof(zhole_size)); |
| for_each_bank(i, mi) { |
| int idx = 0; |
| #ifdef CONFIG_HIGHMEM |
| if (mi->bank[i].highmem) |
| idx = ZONE_HIGHMEM; |
| #endif |
| zhole_size[idx] -= bank_pfn_size(&mi->bank[i]); |
| } |
| |
| /* |
| * Adjust the sizes according to any special requirements for |
| * this machine type. |
| */ |
| arch_adjust_zones(zone_size, zhole_size); |
| |
| free_area_init_node(0, zone_size, min, zhole_size); |
| } |
| |
| #ifndef CONFIG_SPARSEMEM |
| int pfn_valid(unsigned long pfn) |
| { |
| return memblock_is_memory(pfn << PAGE_SHIFT); |
| } |
| EXPORT_SYMBOL(pfn_valid); |
| |
| static void arm_memory_present(void) |
| { |
| } |
| #else |
| static void arm_memory_present(void) |
| { |
| struct memblock_region *reg; |
| |
| for_each_memblock(memory, reg) |
| memory_present(0, memblock_region_memory_base_pfn(reg), |
| memblock_region_memory_end_pfn(reg)); |
| } |
| #endif |
| |
| static int __init meminfo_cmp(const void *_a, const void *_b) |
| { |
| const struct membank *a = _a, *b = _b; |
| long cmp = bank_pfn_start(a) - bank_pfn_start(b); |
| return cmp < 0 ? -1 : cmp > 0 ? 1 : 0; |
| } |
| |
| void __init arm_memblock_init(struct meminfo *mi, struct machine_desc *mdesc) |
| { |
| int i; |
| |
| sort(&meminfo.bank, meminfo.nr_banks, sizeof(meminfo.bank[0]), meminfo_cmp, NULL); |
| |
| memblock_init(); |
| for (i = 0; i < mi->nr_banks; i++) |
| memblock_add(mi->bank[i].start, mi->bank[i].size); |
| |
| /* Register the kernel text, kernel data and initrd with memblock. */ |
| #ifdef CONFIG_XIP_KERNEL |
| memblock_reserve(__pa(_sdata), _end - _sdata); |
| #else |
| memblock_reserve(__pa(_stext), _end - _stext); |
| #endif |
| #ifdef CONFIG_BLK_DEV_INITRD |
| if (phys_initrd_size) { |
| memblock_reserve(phys_initrd_start, phys_initrd_size); |
| |
| /* Now convert initrd to virtual addresses */ |
| initrd_start = __phys_to_virt(phys_initrd_start); |
| initrd_end = initrd_start + phys_initrd_size; |
| } |
| #endif |
| |
| arm_mm_memblock_reserve(); |
| |
| /* reserve any platform specific memblock areas */ |
| if (mdesc->reserve) |
| mdesc->reserve(); |
| |
| memblock_analyze(); |
| memblock_dump_all(); |
| } |
| |
| void __init bootmem_init(void) |
| { |
| struct meminfo *mi = &meminfo; |
| unsigned long min, max_low, max_high; |
| |
| max_low = max_high = 0; |
| |
| find_limits(mi, &min, &max_low, &max_high); |
| |
| arm_bootmem_init(mi, min, max_low); |
| |
| /* |
| * Sparsemem tries to allocate bootmem in memory_present(), |
| * so must be done after the fixed reservations |
| */ |
| arm_memory_present(); |
| |
| /* |
| * sparse_init() needs the bootmem allocator up and running. |
| */ |
| sparse_init(); |
| |
| /* |
| * Now free the memory - free_area_init_node needs |
| * the sparse mem_map arrays initialized by sparse_init() |
| * for memmap_init_zone(), otherwise all PFNs are invalid. |
| */ |
| arm_bootmem_free(mi, min, max_low, max_high); |
| |
| high_memory = __va((max_low << PAGE_SHIFT) - 1) + 1; |
| |
| /* |
| * This doesn't seem to be used by the Linux memory manager any |
| * more, but is used by ll_rw_block. If we can get rid of it, we |
| * also get rid of some of the stuff above as well. |
| * |
| * Note: max_low_pfn and max_pfn reflect the number of _pages_ in |
| * the system, not the maximum PFN. |
| */ |
| max_low_pfn = max_low - PHYS_PFN_OFFSET; |
| max_pfn = max_high - PHYS_PFN_OFFSET; |
| } |
| |
| static inline int free_area(unsigned long pfn, unsigned long end, char *s) |
| { |
| unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10); |
| |
| for (; pfn < end; pfn++) { |
| struct page *page = pfn_to_page(pfn); |
| ClearPageReserved(page); |
| init_page_count(page); |
| __free_page(page); |
| pages++; |
| } |
| |
| if (size && s) |
| printk(KERN_INFO "Freeing %s memory: %dK\n", s, size); |
| |
| return pages; |
| } |
| |
| static inline void |
| free_memmap(unsigned long start_pfn, unsigned long end_pfn) |
| { |
| struct page *start_pg, *end_pg; |
| unsigned long pg, pgend; |
| |
| /* |
| * Convert start_pfn/end_pfn to a struct page pointer. |
| */ |
| start_pg = pfn_to_page(start_pfn - 1) + 1; |
| end_pg = pfn_to_page(end_pfn); |
| |
| /* |
| * Convert to physical addresses, and |
| * round start upwards and end downwards. |
| */ |
| pg = PAGE_ALIGN(__pa(start_pg)); |
| pgend = __pa(end_pg) & PAGE_MASK; |
| |
| /* |
| * If there are free pages between these, |
| * free the section of the memmap array. |
| */ |
| if (pg < pgend) |
| free_bootmem(pg, pgend - pg); |
| } |
| |
| /* |
| * The mem_map array can get very big. Free the unused area of the memory map. |
| */ |
| static void __init free_unused_memmap(struct meminfo *mi) |
| { |
| unsigned long bank_start, prev_bank_end = 0; |
| unsigned int i; |
| |
| /* |
| * This relies on each bank being in address order. |
| * The banks are sorted previously in bootmem_init(). |
| */ |
| for_each_bank(i, mi) { |
| struct membank *bank = &mi->bank[i]; |
| |
| bank_start = bank_pfn_start(bank); |
| |
| /* |
| * If we had a previous bank, and there is a space |
| * between the current bank and the previous, free it. |
| */ |
| if (prev_bank_end && prev_bank_end < bank_start) |
| free_memmap(prev_bank_end, bank_start); |
| |
| /* |
| * Align up here since the VM subsystem insists that the |
| * memmap entries are valid from the bank end aligned to |
| * MAX_ORDER_NR_PAGES. |
| */ |
| prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES); |
| } |
| } |
| |
| /* |
| * mem_init() marks the free areas in the mem_map and tells us how much |
| * memory is free. This is done after various parts of the system have |
| * claimed their memory after the kernel image. |
| */ |
| void __init mem_init(void) |
| { |
| unsigned long reserved_pages, free_pages; |
| int i; |
| #ifdef CONFIG_HAVE_TCM |
| /* These pointers are filled in on TCM detection */ |
| extern u32 dtcm_end; |
| extern u32 itcm_end; |
| #endif |
| |
| max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map; |
| |
| /* this will put all unused low memory onto the freelists */ |
| free_unused_memmap(&meminfo); |
| |
| totalram_pages += free_all_bootmem(); |
| |
| #ifdef CONFIG_SA1111 |
| /* now that our DMA memory is actually so designated, we can free it */ |
| totalram_pages += free_area(PHYS_PFN_OFFSET, |
| __phys_to_pfn(__pa(swapper_pg_dir)), NULL); |
| #endif |
| |
| #ifdef CONFIG_HIGHMEM |
| /* set highmem page free */ |
| for_each_bank (i, &meminfo) { |
| unsigned long start = bank_pfn_start(&meminfo.bank[i]); |
| unsigned long end = bank_pfn_end(&meminfo.bank[i]); |
| if (start >= max_low_pfn + PHYS_PFN_OFFSET) |
| totalhigh_pages += free_area(start, end, NULL); |
| } |
| totalram_pages += totalhigh_pages; |
| #endif |
| |
| reserved_pages = free_pages = 0; |
| |
| for_each_bank(i, &meminfo) { |
| struct membank *bank = &meminfo.bank[i]; |
| unsigned int pfn1, pfn2; |
| struct page *page, *end; |
| |
| pfn1 = bank_pfn_start(bank); |
| pfn2 = bank_pfn_end(bank); |
| |
| page = pfn_to_page(pfn1); |
| end = pfn_to_page(pfn2 - 1) + 1; |
| |
| do { |
| if (PageReserved(page)) |
| reserved_pages++; |
| else if (!page_count(page)) |
| free_pages++; |
| page++; |
| } while (page < end); |
| } |
| |
| /* |
| * Since our memory may not be contiguous, calculate the |
| * real number of pages we have in this system |
| */ |
| printk(KERN_INFO "Memory:"); |
| num_physpages = 0; |
| for (i = 0; i < meminfo.nr_banks; i++) { |
| num_physpages += bank_pfn_size(&meminfo.bank[i]); |
| printk(" %ldMB", bank_phys_size(&meminfo.bank[i]) >> 20); |
| } |
| printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT)); |
| |
| printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem\n", |
| nr_free_pages() << (PAGE_SHIFT-10), |
| free_pages << (PAGE_SHIFT-10), |
| reserved_pages << (PAGE_SHIFT-10), |
| totalhigh_pages << (PAGE_SHIFT-10)); |
| |
| #define MLK(b, t) b, t, ((t) - (b)) >> 10 |
| #define MLM(b, t) b, t, ((t) - (b)) >> 20 |
| #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K) |
| |
| printk(KERN_NOTICE "Virtual kernel memory layout:\n" |
| " vector : 0x%08lx - 0x%08lx (%4ld kB)\n" |
| #ifdef CONFIG_HAVE_TCM |
| " DTCM : 0x%08lx - 0x%08lx (%4ld kB)\n" |
| " ITCM : 0x%08lx - 0x%08lx (%4ld kB)\n" |
| #endif |
| " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" |
| #ifdef CONFIG_MMU |
| " DMA : 0x%08lx - 0x%08lx (%4ld MB)\n" |
| #endif |
| " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" |
| " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n" |
| #ifdef CONFIG_HIGHMEM |
| " pkmap : 0x%08lx - 0x%08lx (%4ld MB)\n" |
| #endif |
| " modules : 0x%08lx - 0x%08lx (%4ld MB)\n" |
| " .init : 0x%p" " - 0x%p" " (%4d kB)\n" |
| " .text : 0x%p" " - 0x%p" " (%4d kB)\n" |
| " .data : 0x%p" " - 0x%p" " (%4d kB)\n", |
| |
| MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) + |
| (PAGE_SIZE)), |
| #ifdef CONFIG_HAVE_TCM |
| MLK(DTCM_OFFSET, (unsigned long) dtcm_end), |
| MLK(ITCM_OFFSET, (unsigned long) itcm_end), |
| #endif |
| MLK(FIXADDR_START, FIXADDR_TOP), |
| #ifdef CONFIG_MMU |
| MLM(CONSISTENT_BASE, CONSISTENT_END), |
| #endif |
| MLM(VMALLOC_START, VMALLOC_END), |
| MLM(PAGE_OFFSET, (unsigned long)high_memory), |
| #ifdef CONFIG_HIGHMEM |
| MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) * |
| (PAGE_SIZE)), |
| #endif |
| MLM(MODULES_VADDR, MODULES_END), |
| |
| MLK_ROUNDUP(__init_begin, __init_end), |
| MLK_ROUNDUP(_text, _etext), |
| MLK_ROUNDUP(_sdata, _edata)); |
| |
| #undef MLK |
| #undef MLM |
| #undef MLK_ROUNDUP |
| |
| /* |
| * Check boundaries twice: Some fundamental inconsistencies can |
| * be detected at build time already. |
| */ |
| #ifdef CONFIG_MMU |
| BUILD_BUG_ON(VMALLOC_END > CONSISTENT_BASE); |
| BUG_ON(VMALLOC_END > CONSISTENT_BASE); |
| |
| BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR); |
| BUG_ON(TASK_SIZE > MODULES_VADDR); |
| #endif |
| |
| #ifdef CONFIG_HIGHMEM |
| BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); |
| BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); |
| #endif |
| |
| if (PAGE_SIZE >= 16384 && num_physpages <= 128) { |
| extern int sysctl_overcommit_memory; |
| /* |
| * On a machine this small we won't get |
| * anywhere without overcommit, so turn |
| * it on by default. |
| */ |
| sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; |
| } |
| } |
| |
| void free_initmem(void) |
| { |
| #ifdef CONFIG_HAVE_TCM |
| extern char __tcm_start, __tcm_end; |
| |
| totalram_pages += free_area(__phys_to_pfn(__pa(&__tcm_start)), |
| __phys_to_pfn(__pa(&__tcm_end)), |
| "TCM link"); |
| #endif |
| |
| if (!machine_is_integrator() && !machine_is_cintegrator()) |
| totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)), |
| __phys_to_pfn(__pa(__init_end)), |
| "init"); |
| } |
| |
| #ifdef CONFIG_BLK_DEV_INITRD |
| |
| static int keep_initrd; |
| |
| void free_initrd_mem(unsigned long start, unsigned long end) |
| { |
| if (!keep_initrd) |
| totalram_pages += free_area(__phys_to_pfn(__pa(start)), |
| __phys_to_pfn(__pa(end)), |
| "initrd"); |
| } |
| |
| static int __init keepinitrd_setup(char *__unused) |
| { |
| keep_initrd = 1; |
| return 1; |
| } |
| |
| __setup("keepinitrd", keepinitrd_setup); |
| #endif |