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618 lines
15 KiB
C
618 lines
15 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/nodemask.h>
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#include <linux/initrd.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 <asm/mach-types.h>
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#include <asm/sections.h>
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#include <asm/setup.h>
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#include <asm/sizes.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 unsigned long 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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unsigned long start, 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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/*
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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(void)
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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();
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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(struct meminfo *mi,
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unsigned long *min, unsigned long *max_low, unsigned long *max_high)
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{
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int i;
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*min = -1UL;
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*max_low = *max_high = 0;
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for_each_bank (i, mi) {
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struct membank *bank = &mi->bank[i];
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unsigned long start, end;
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start = bank_pfn_start(bank);
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end = bank_pfn_end(bank);
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if (*min > start)
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*min = start;
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if (*max_high < end)
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*max_high = end;
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if (bank->highmem)
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continue;
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if (*max_low < end)
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*max_low = end;
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}
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}
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static void __init arm_bootmem_init(struct meminfo *mi,
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unsigned long start_pfn, unsigned long end_pfn)
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{
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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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int i;
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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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for_each_bank(i, mi) {
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struct membank *bank = &mi->bank[i];
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if (!bank->highmem)
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free_bootmem(bank_phys_start(bank), bank_phys_size(bank));
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}
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/*
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* Reserve the memblock reserved regions in bootmem.
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*/
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for (i = 0; i < memblock.reserved.cnt; i++) {
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phys_addr_t start = memblock_start_pfn(&memblock.reserved, i);
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if (start >= start_pfn &&
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memblock_end_pfn(&memblock.reserved, i) <= end_pfn)
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reserve_bootmem_node(pgdat, __pfn_to_phys(start),
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memblock_size_bytes(&memblock.reserved, i),
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BOOTMEM_DEFAULT);
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}
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}
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static void __init arm_bootmem_free(struct meminfo *mi, unsigned long min,
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unsigned long max_low, 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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int i;
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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_bank(i, mi) {
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int idx = 0;
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#ifdef CONFIG_HIGHMEM
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if (mi->bank[i].highmem)
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idx = ZONE_HIGHMEM;
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#endif
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zhole_size[idx] -= bank_pfn_size(&mi->bank[i]);
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}
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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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arch_adjust_zones(zone_size, zhole_size);
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free_area_init_node(0, zone_size, min, zhole_size);
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}
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#ifndef CONFIG_SPARSEMEM
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int pfn_valid(unsigned long pfn)
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{
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struct memblock_region *mem = &memblock.memory;
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unsigned int left = 0, right = mem->cnt;
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do {
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unsigned int mid = (right + left) / 2;
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if (pfn < memblock_start_pfn(mem, mid))
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right = mid;
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else if (pfn >= memblock_end_pfn(mem, mid))
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left = mid + 1;
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else
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return 1;
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} while (left < right);
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return 0;
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}
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EXPORT_SYMBOL(pfn_valid);
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static void arm_memory_present(void)
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{
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}
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#else
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static void arm_memory_present(void)
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{
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int i;
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for (i = 0; i < memblock.memory.cnt; i++)
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memory_present(0, memblock_start_pfn(&memblock.memory, i),
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memblock_end_pfn(&memblock.memory, i));
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}
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#endif
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void __init arm_memblock_init(struct meminfo *mi, struct machine_desc *mdesc)
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{
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int i;
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memblock_init();
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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(_data), _end - _data);
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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_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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/* reserve any platform specific memblock areas */
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if (mdesc->reserve)
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mdesc->reserve();
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memblock_analyze();
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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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struct meminfo *mi = &meminfo;
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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(mi, &min, &max_low, &max_high);
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arm_bootmem_init(mi, 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(mi, min, max_low, max_high);
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high_memory = __va((max_low << PAGE_SHIFT) - 1) + 1;
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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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static inline int free_area(unsigned long pfn, unsigned long end, char *s)
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{
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unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10);
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for (; pfn < end; pfn++) {
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struct page *page = pfn_to_page(pfn);
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ClearPageReserved(page);
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init_page_count(page);
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__free_page(page);
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pages++;
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}
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if (size && s)
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printk(KERN_INFO "Freeing %s memory: %dK\n", s, size);
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return pages;
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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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unsigned long 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);
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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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/*
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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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}
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/*
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* mem_init() marks the free areas in the mem_map and tells us how much
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* memory is free. This is done after various parts of the system have
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* claimed their memory after the kernel image.
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*/
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void __init mem_init(void)
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{
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unsigned long reserved_pages, free_pages;
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int i;
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#ifdef CONFIG_HAVE_TCM
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/* These pointers are filled in on TCM detection */
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extern u32 dtcm_end;
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extern u32 itcm_end;
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#endif
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max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
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/* this will put all unused low memory onto the freelists */
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free_unused_memmap(&meminfo);
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totalram_pages += free_all_bootmem();
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#ifdef CONFIG_SA1111
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/* now that our DMA memory is actually so designated, we can free it */
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totalram_pages += free_area(PHYS_PFN_OFFSET,
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__phys_to_pfn(__pa(swapper_pg_dir)), NULL);
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#endif
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#ifdef CONFIG_HIGHMEM
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/* set highmem page free */
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for_each_bank (i, &meminfo) {
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unsigned long start = bank_pfn_start(&meminfo.bank[i]);
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unsigned long end = bank_pfn_end(&meminfo.bank[i]);
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if (start >= max_low_pfn + PHYS_PFN_OFFSET)
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totalhigh_pages += free_area(start, end, NULL);
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}
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totalram_pages += totalhigh_pages;
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#endif
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reserved_pages = free_pages = 0;
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for_each_bank(i, &meminfo) {
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struct membank *bank = &meminfo.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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if (PageReserved(page))
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reserved_pages++;
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else if (!page_count(page))
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free_pages++;
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page++;
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} while (page < end);
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}
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/*
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* Since our memory may not be contiguous, calculate the
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* real number of pages we have in this system
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*/
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printk(KERN_INFO "Memory:");
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num_physpages = 0;
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for (i = 0; i < meminfo.nr_banks; i++) {
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num_physpages += bank_pfn_size(&meminfo.bank[i]);
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printk(" %ldMB", bank_phys_size(&meminfo.bank[i]) >> 20);
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}
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printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT));
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printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem\n",
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nr_free_pages() << (PAGE_SHIFT-10),
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free_pages << (PAGE_SHIFT-10),
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reserved_pages << (PAGE_SHIFT-10),
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totalhigh_pages << (PAGE_SHIFT-10));
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#define MLK(b, t) b, t, ((t) - (b)) >> 10
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#define MLM(b, t) b, t, ((t) - (b)) >> 20
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#define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
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printk(KERN_NOTICE "Virtual kernel memory layout:\n"
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" vector : 0x%08lx - 0x%08lx (%4ld kB)\n"
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#ifdef CONFIG_HAVE_TCM
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" DTCM : 0x%08lx - 0x%08lx (%4ld kB)\n"
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" ITCM : 0x%08lx - 0x%08lx (%4ld kB)\n"
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#endif
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" fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n"
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#ifdef CONFIG_MMU
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" DMA : 0x%08lx - 0x%08lx (%4ld MB)\n"
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#endif
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" vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n"
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" lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n"
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#ifdef CONFIG_HIGHMEM
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" 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(_data, _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
|