ff69a4c855
struct machine_desc records are defined everywhere as a 'const' structure, but unfortuantely it loses its const-ness through the use of linker magic - the symbols which surround the section are not declared const so it becomes possible not to use 'const' for pointers to these const structures. Let's fix this oversight - all pointers to these structures should be marked const too. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
716 lines
18 KiB
C
716 lines
18 KiB
C
/*
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* linux/arch/arm/mm/init.c
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*
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* Copyright (C) 1995-2005 Russell King
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/swap.h>
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#include <linux/init.h>
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#include <linux/bootmem.h>
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#include <linux/mman.h>
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#include <linux/export.h>
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#include <linux/nodemask.h>
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#include <linux/initrd.h>
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#include <linux/of_fdt.h>
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#include <linux/highmem.h>
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#include <linux/gfp.h>
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#include <linux/memblock.h>
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#include <linux/dma-contiguous.h>
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#include <linux/sizes.h>
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#include <asm/mach-types.h>
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#include <asm/memblock.h>
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#include <asm/prom.h>
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#include <asm/sections.h>
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#include <asm/setup.h>
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#include <asm/tlb.h>
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#include <asm/fixmap.h>
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#include <asm/mach/arch.h>
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#include <asm/mach/map.h>
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#include "mm.h"
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static phys_addr_t phys_initrd_start __initdata = 0;
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static unsigned long phys_initrd_size __initdata = 0;
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static int __init early_initrd(char *p)
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{
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phys_addr_t start;
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unsigned long size;
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char *endp;
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start = memparse(p, &endp);
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if (*endp == ',') {
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size = memparse(endp + 1, NULL);
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phys_initrd_start = start;
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phys_initrd_size = size;
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}
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return 0;
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}
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early_param("initrd", early_initrd);
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static int __init parse_tag_initrd(const struct tag *tag)
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{
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printk(KERN_WARNING "ATAG_INITRD is deprecated; "
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"please update your bootloader.\n");
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phys_initrd_start = __virt_to_phys(tag->u.initrd.start);
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phys_initrd_size = tag->u.initrd.size;
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return 0;
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}
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__tagtable(ATAG_INITRD, parse_tag_initrd);
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static int __init parse_tag_initrd2(const struct tag *tag)
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{
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phys_initrd_start = tag->u.initrd.start;
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phys_initrd_size = tag->u.initrd.size;
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return 0;
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}
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__tagtable(ATAG_INITRD2, parse_tag_initrd2);
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#ifdef CONFIG_OF_FLATTREE
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void __init early_init_dt_setup_initrd_arch(unsigned long start, unsigned long end)
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{
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phys_initrd_start = start;
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phys_initrd_size = end - start;
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}
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#endif /* CONFIG_OF_FLATTREE */
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/*
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* This keeps memory configuration data used by a couple memory
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* initialization functions, as well as show_mem() for the skipping
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* of holes in the memory map. It is populated by arm_add_memory().
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*/
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struct meminfo meminfo;
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void show_mem(unsigned int filter)
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{
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int free = 0, total = 0, reserved = 0;
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int shared = 0, cached = 0, slab = 0, i;
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struct meminfo * mi = &meminfo;
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printk("Mem-info:\n");
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show_free_areas(filter);
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if (filter & SHOW_MEM_FILTER_PAGE_COUNT)
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return;
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for_each_bank (i, mi) {
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struct membank *bank = &mi->bank[i];
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unsigned int pfn1, pfn2;
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struct page *page, *end;
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pfn1 = bank_pfn_start(bank);
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pfn2 = bank_pfn_end(bank);
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page = pfn_to_page(pfn1);
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end = pfn_to_page(pfn2 - 1) + 1;
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do {
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total++;
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if (PageReserved(page))
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reserved++;
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else if (PageSwapCache(page))
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cached++;
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else if (PageSlab(page))
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slab++;
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else if (!page_count(page))
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free++;
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else
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shared += page_count(page) - 1;
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page++;
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} while (page < end);
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}
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printk("%d pages of RAM\n", total);
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printk("%d free pages\n", free);
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printk("%d reserved pages\n", reserved);
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printk("%d slab pages\n", slab);
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printk("%d pages shared\n", shared);
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printk("%d pages swap cached\n", cached);
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}
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static void __init find_limits(unsigned long *min, unsigned long *max_low,
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unsigned long *max_high)
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{
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struct meminfo *mi = &meminfo;
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int i;
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/* This assumes the meminfo array is properly sorted */
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*min = bank_pfn_start(&mi->bank[0]);
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for_each_bank (i, mi)
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if (mi->bank[i].highmem)
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break;
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*max_low = bank_pfn_end(&mi->bank[i - 1]);
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*max_high = bank_pfn_end(&mi->bank[mi->nr_banks - 1]);
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}
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static void __init arm_bootmem_init(unsigned long start_pfn,
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unsigned long end_pfn)
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{
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struct memblock_region *reg;
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unsigned int boot_pages;
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phys_addr_t bitmap;
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pg_data_t *pgdat;
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/*
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* Allocate the bootmem bitmap page. This must be in a region
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* of memory which has already been mapped.
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*/
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boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
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bitmap = memblock_alloc_base(boot_pages << PAGE_SHIFT, L1_CACHE_BYTES,
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__pfn_to_phys(end_pfn));
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/*
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* Initialise the bootmem allocator, handing the
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* memory banks over to bootmem.
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*/
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node_set_online(0);
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pgdat = NODE_DATA(0);
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init_bootmem_node(pgdat, __phys_to_pfn(bitmap), start_pfn, end_pfn);
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/* Free the lowmem regions from memblock into bootmem. */
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for_each_memblock(memory, reg) {
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unsigned long start = memblock_region_memory_base_pfn(reg);
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unsigned long end = memblock_region_memory_end_pfn(reg);
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if (end >= end_pfn)
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end = end_pfn;
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if (start >= end)
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break;
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free_bootmem(__pfn_to_phys(start), (end - start) << PAGE_SHIFT);
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}
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/* Reserve the lowmem memblock reserved regions in bootmem. */
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for_each_memblock(reserved, reg) {
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unsigned long start = memblock_region_reserved_base_pfn(reg);
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unsigned long end = memblock_region_reserved_end_pfn(reg);
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if (end >= end_pfn)
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end = end_pfn;
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if (start >= end)
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break;
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reserve_bootmem(__pfn_to_phys(start),
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(end - start) << PAGE_SHIFT, BOOTMEM_DEFAULT);
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}
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}
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#ifdef CONFIG_ZONE_DMA
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unsigned long arm_dma_zone_size __read_mostly;
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EXPORT_SYMBOL(arm_dma_zone_size);
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/*
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* The DMA mask corresponding to the maximum bus address allocatable
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* using GFP_DMA. The default here places no restriction on DMA
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* allocations. This must be the smallest DMA mask in the system,
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* so a successful GFP_DMA allocation will always satisfy this.
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*/
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phys_addr_t arm_dma_limit;
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static void __init arm_adjust_dma_zone(unsigned long *size, unsigned long *hole,
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unsigned long dma_size)
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{
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if (size[0] <= dma_size)
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return;
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size[ZONE_NORMAL] = size[0] - dma_size;
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size[ZONE_DMA] = dma_size;
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hole[ZONE_NORMAL] = hole[0];
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hole[ZONE_DMA] = 0;
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}
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#endif
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void __init setup_dma_zone(const struct machine_desc *mdesc)
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{
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#ifdef CONFIG_ZONE_DMA
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if (mdesc->dma_zone_size) {
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arm_dma_zone_size = mdesc->dma_zone_size;
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arm_dma_limit = PHYS_OFFSET + arm_dma_zone_size - 1;
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} else
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arm_dma_limit = 0xffffffff;
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#endif
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}
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static void __init arm_bootmem_free(unsigned long min, unsigned long max_low,
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unsigned long max_high)
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{
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unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
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struct memblock_region *reg;
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/*
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* initialise the zones.
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*/
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memset(zone_size, 0, sizeof(zone_size));
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/*
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* The memory size has already been determined. If we need
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* to do anything fancy with the allocation of this memory
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* to the zones, now is the time to do it.
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*/
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zone_size[0] = max_low - min;
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#ifdef CONFIG_HIGHMEM
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zone_size[ZONE_HIGHMEM] = max_high - max_low;
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#endif
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/*
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* Calculate the size of the holes.
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* holes = node_size - sum(bank_sizes)
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*/
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memcpy(zhole_size, zone_size, sizeof(zhole_size));
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for_each_memblock(memory, reg) {
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unsigned long start = memblock_region_memory_base_pfn(reg);
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unsigned long end = memblock_region_memory_end_pfn(reg);
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if (start < max_low) {
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unsigned long low_end = min(end, max_low);
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zhole_size[0] -= low_end - start;
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}
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#ifdef CONFIG_HIGHMEM
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if (end > max_low) {
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unsigned long high_start = max(start, max_low);
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zhole_size[ZONE_HIGHMEM] -= end - high_start;
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}
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#endif
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}
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#ifdef CONFIG_ZONE_DMA
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/*
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* Adjust the sizes according to any special requirements for
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* this machine type.
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*/
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if (arm_dma_zone_size)
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arm_adjust_dma_zone(zone_size, zhole_size,
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arm_dma_zone_size >> PAGE_SHIFT);
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#endif
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free_area_init_node(0, zone_size, min, zhole_size);
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}
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#ifdef CONFIG_HAVE_ARCH_PFN_VALID
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int pfn_valid(unsigned long pfn)
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{
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return memblock_is_memory(__pfn_to_phys(pfn));
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}
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EXPORT_SYMBOL(pfn_valid);
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#endif
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#ifndef CONFIG_SPARSEMEM
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static void __init arm_memory_present(void)
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{
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}
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#else
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static void __init arm_memory_present(void)
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{
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struct memblock_region *reg;
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for_each_memblock(memory, reg)
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memory_present(0, memblock_region_memory_base_pfn(reg),
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memblock_region_memory_end_pfn(reg));
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}
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#endif
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static bool arm_memblock_steal_permitted = true;
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phys_addr_t __init arm_memblock_steal(phys_addr_t size, phys_addr_t align)
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{
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phys_addr_t phys;
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BUG_ON(!arm_memblock_steal_permitted);
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phys = memblock_alloc_base(size, align, MEMBLOCK_ALLOC_ANYWHERE);
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memblock_free(phys, size);
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memblock_remove(phys, size);
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return phys;
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}
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void __init arm_memblock_init(struct meminfo *mi,
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const struct machine_desc *mdesc)
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{
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int i;
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for (i = 0; i < mi->nr_banks; i++)
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memblock_add(mi->bank[i].start, mi->bank[i].size);
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/* Register the kernel text, kernel data and initrd with memblock. */
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#ifdef CONFIG_XIP_KERNEL
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memblock_reserve(__pa(_sdata), _end - _sdata);
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#else
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memblock_reserve(__pa(_stext), _end - _stext);
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#endif
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#ifdef CONFIG_BLK_DEV_INITRD
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if (phys_initrd_size &&
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!memblock_is_region_memory(phys_initrd_start, phys_initrd_size)) {
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pr_err("INITRD: 0x%08llx+0x%08lx is not a memory region - disabling initrd\n",
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(u64)phys_initrd_start, phys_initrd_size);
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phys_initrd_start = phys_initrd_size = 0;
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}
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if (phys_initrd_size &&
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memblock_is_region_reserved(phys_initrd_start, phys_initrd_size)) {
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pr_err("INITRD: 0x%08llx+0x%08lx overlaps in-use memory region - disabling initrd\n",
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(u64)phys_initrd_start, phys_initrd_size);
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phys_initrd_start = phys_initrd_size = 0;
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}
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if (phys_initrd_size) {
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memblock_reserve(phys_initrd_start, phys_initrd_size);
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/* Now convert initrd to virtual addresses */
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initrd_start = __phys_to_virt(phys_initrd_start);
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initrd_end = initrd_start + phys_initrd_size;
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}
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#endif
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arm_mm_memblock_reserve();
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arm_dt_memblock_reserve();
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/* reserve any platform specific memblock areas */
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if (mdesc->reserve)
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mdesc->reserve();
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/*
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* reserve memory for DMA contigouos allocations,
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* must come from DMA area inside low memory
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*/
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dma_contiguous_reserve(min(arm_dma_limit, arm_lowmem_limit));
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arm_memblock_steal_permitted = false;
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memblock_allow_resize();
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memblock_dump_all();
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}
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void __init bootmem_init(void)
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{
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unsigned long min, max_low, max_high;
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max_low = max_high = 0;
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find_limits(&min, &max_low, &max_high);
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arm_bootmem_init(min, max_low);
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/*
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* Sparsemem tries to allocate bootmem in memory_present(),
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* so must be done after the fixed reservations
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*/
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arm_memory_present();
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/*
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* sparse_init() needs the bootmem allocator up and running.
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*/
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sparse_init();
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/*
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* Now free the memory - free_area_init_node needs
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* the sparse mem_map arrays initialized by sparse_init()
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* for memmap_init_zone(), otherwise all PFNs are invalid.
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*/
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arm_bootmem_free(min, max_low, max_high);
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/*
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* This doesn't seem to be used by the Linux memory manager any
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* more, but is used by ll_rw_block. If we can get rid of it, we
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* also get rid of some of the stuff above as well.
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*
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* Note: max_low_pfn and max_pfn reflect the number of _pages_ in
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* the system, not the maximum PFN.
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*/
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max_low_pfn = max_low - PHYS_PFN_OFFSET;
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max_pfn = max_high - PHYS_PFN_OFFSET;
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}
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/*
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* Poison init memory with an undefined instruction (ARM) or a branch to an
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* undefined instruction (Thumb).
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*/
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static inline void poison_init_mem(void *s, size_t count)
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{
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u32 *p = (u32 *)s;
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for (; count != 0; count -= 4)
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*p++ = 0xe7fddef0;
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}
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static inline void
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free_memmap(unsigned long start_pfn, unsigned long end_pfn)
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{
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struct page *start_pg, *end_pg;
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phys_addr_t pg, pgend;
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/*
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* Convert start_pfn/end_pfn to a struct page pointer.
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*/
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start_pg = pfn_to_page(start_pfn - 1) + 1;
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end_pg = pfn_to_page(end_pfn - 1) + 1;
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/*
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* Convert to physical addresses, and
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* round start upwards and end downwards.
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*/
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pg = PAGE_ALIGN(__pa(start_pg));
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pgend = __pa(end_pg) & PAGE_MASK;
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/*
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* If there are free pages between these,
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* free the section of the memmap array.
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*/
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if (pg < pgend)
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free_bootmem(pg, pgend - pg);
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}
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/*
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* The mem_map array can get very big. Free the unused area of the memory map.
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*/
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static void __init free_unused_memmap(struct meminfo *mi)
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{
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unsigned long bank_start, prev_bank_end = 0;
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unsigned int i;
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/*
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* This relies on each bank being in address order.
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* The banks are sorted previously in bootmem_init().
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*/
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for_each_bank(i, mi) {
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struct membank *bank = &mi->bank[i];
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bank_start = bank_pfn_start(bank);
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#ifdef CONFIG_SPARSEMEM
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/*
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* Take care not to free memmap entries that don't exist
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* due to SPARSEMEM sections which aren't present.
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*/
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bank_start = min(bank_start,
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ALIGN(prev_bank_end, PAGES_PER_SECTION));
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#else
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/*
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* Align down here since the VM subsystem insists that the
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* memmap entries are valid from the bank start aligned to
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* MAX_ORDER_NR_PAGES.
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*/
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bank_start = round_down(bank_start, MAX_ORDER_NR_PAGES);
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#endif
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/*
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* If we had a previous bank, and there is a space
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* between the current bank and the previous, free it.
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*/
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if (prev_bank_end && prev_bank_end < bank_start)
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free_memmap(prev_bank_end, bank_start);
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/*
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* Align up here since the VM subsystem insists that the
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* memmap entries are valid from the bank end aligned to
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* MAX_ORDER_NR_PAGES.
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*/
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prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES);
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}
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|
#ifdef CONFIG_SPARSEMEM
|
|
if (!IS_ALIGNED(prev_bank_end, PAGES_PER_SECTION))
|
|
free_memmap(prev_bank_end,
|
|
ALIGN(prev_bank_end, PAGES_PER_SECTION));
|
|
#endif
|
|
}
|
|
|
|
#ifdef CONFIG_HIGHMEM
|
|
static inline void free_area_high(unsigned long pfn, unsigned long end)
|
|
{
|
|
for (; pfn < end; pfn++)
|
|
free_highmem_page(pfn_to_page(pfn));
|
|
}
|
|
#endif
|
|
|
|
static void __init free_highpages(void)
|
|
{
|
|
#ifdef CONFIG_HIGHMEM
|
|
unsigned long max_low = max_low_pfn + PHYS_PFN_OFFSET;
|
|
struct memblock_region *mem, *res;
|
|
|
|
/* set highmem page free */
|
|
for_each_memblock(memory, mem) {
|
|
unsigned long start = memblock_region_memory_base_pfn(mem);
|
|
unsigned long end = memblock_region_memory_end_pfn(mem);
|
|
|
|
/* Ignore complete lowmem entries */
|
|
if (end <= max_low)
|
|
continue;
|
|
|
|
/* Truncate partial highmem entries */
|
|
if (start < max_low)
|
|
start = max_low;
|
|
|
|
/* Find and exclude any reserved regions */
|
|
for_each_memblock(reserved, res) {
|
|
unsigned long res_start, res_end;
|
|
|
|
res_start = memblock_region_reserved_base_pfn(res);
|
|
res_end = memblock_region_reserved_end_pfn(res);
|
|
|
|
if (res_end < start)
|
|
continue;
|
|
if (res_start < start)
|
|
res_start = start;
|
|
if (res_start > end)
|
|
res_start = end;
|
|
if (res_end > end)
|
|
res_end = end;
|
|
if (res_start != start)
|
|
free_area_high(start, res_start);
|
|
start = res_end;
|
|
if (start == end)
|
|
break;
|
|
}
|
|
|
|
/* And now free anything which remains */
|
|
if (start < end)
|
|
free_area_high(start, end);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
#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);
|
|
free_all_bootmem();
|
|
|
|
#ifdef CONFIG_SA1111
|
|
/* now that our DMA memory is actually so designated, we can free it */
|
|
free_reserved_area(__va(PHYS_OFFSET), swapper_pg_dir, -1, NULL);
|
|
#endif
|
|
|
|
free_highpages();
|
|
|
|
mem_init_print_info(NULL);
|
|
|
|
#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"
|
|
" 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
|
|
#ifdef CONFIG_MODULES
|
|
" modules : 0x%08lx - 0x%08lx (%4ld MB)\n"
|
|
#endif
|
|
" .text : 0x%p" " - 0x%p" " (%4d kB)\n"
|
|
" .init : 0x%p" " - 0x%p" " (%4d kB)\n"
|
|
" .data : 0x%p" " - 0x%p" " (%4d kB)\n"
|
|
" .bss : 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),
|
|
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
|
|
#ifdef CONFIG_MODULES
|
|
MLM(MODULES_VADDR, MODULES_END),
|
|
#endif
|
|
|
|
MLK_ROUNDUP(_text, _etext),
|
|
MLK_ROUNDUP(__init_begin, __init_end),
|
|
MLK_ROUNDUP(_sdata, _edata),
|
|
MLK_ROUNDUP(__bss_start, __bss_stop));
|
|
|
|
#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(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 && get_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;
|
|
|
|
poison_init_mem(&__tcm_start, &__tcm_end - &__tcm_start);
|
|
free_reserved_area(&__tcm_start, &__tcm_end, -1, "TCM link");
|
|
#endif
|
|
|
|
poison_init_mem(__init_begin, __init_end - __init_begin);
|
|
if (!machine_is_integrator() && !machine_is_cintegrator())
|
|
free_initmem_default(-1);
|
|
}
|
|
|
|
#ifdef CONFIG_BLK_DEV_INITRD
|
|
|
|
static int keep_initrd;
|
|
|
|
void free_initrd_mem(unsigned long start, unsigned long end)
|
|
{
|
|
if (!keep_initrd) {
|
|
poison_init_mem((void *)start, PAGE_ALIGN(end) - start);
|
|
free_reserved_area((void *)start, (void *)end, -1, "initrd");
|
|
}
|
|
}
|
|
|
|
static int __init keepinitrd_setup(char *__unused)
|
|
{
|
|
keep_initrd = 1;
|
|
return 1;
|
|
}
|
|
|
|
__setup("keepinitrd", keepinitrd_setup);
|
|
#endif
|