diff options
Diffstat (limited to 'arch/arm26/mm/init.c')
| -rw-r--r-- | arch/arm26/mm/init.c | 403 |
1 files changed, 0 insertions, 403 deletions
diff --git a/arch/arm26/mm/init.c b/arch/arm26/mm/init.c deleted file mode 100644 index 36e7ee3f832..00000000000 --- a/arch/arm26/mm/init.c +++ /dev/null @@ -1,403 +0,0 @@ -/* - * linux/arch/arm26/mm/init.c - * - * Copyright (C) 1995-2002 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/signal.h> -#include <linux/sched.h> -#include <linux/kernel.h> -#include <linux/errno.h> -#include <linux/string.h> -#include <linux/types.h> -#include <linux/ptrace.h> -#include <linux/mman.h> -#include <linux/mm.h> -#include <linux/swap.h> -#include <linux/smp.h> -#include <linux/init.h> -#include <linux/initrd.h> -#include <linux/bootmem.h> -#include <linux/blkdev.h> -#include <linux/pfn.h> - -#include <asm/segment.h> -#include <asm/mach-types.h> -#include <asm/dma.h> -#include <asm/hardware.h> -#include <asm/setup.h> -#include <asm/tlb.h> - -#include <asm/map.h> - -struct mmu_gather mmu_gathers[NR_CPUS]; - -extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; -extern char _stext, _text, _etext, _end, __init_begin, __init_end; -#ifdef CONFIG_XIP_KERNEL -extern char _endtext, _sdata; -#endif -extern unsigned long phys_initrd_start; -extern unsigned long phys_initrd_size; - -/* - * The sole use of this is to pass memory configuration - * data from paging_init to mem_init. - */ -static struct meminfo meminfo __initdata = { 0, }; - -/* - * empty_zero_page is a special page that is used for - * zero-initialized data and COW. - */ -struct page *empty_zero_page; - -void show_mem(void) -{ - int free = 0, total = 0, reserved = 0; - int shared = 0, cached = 0, slab = 0; - struct page *page, *end; - - printk("Mem-info:\n"); - show_free_areas(); - printk("Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10)); - - - page = NODE_MEM_MAP(0); - end = page + NODE_DATA(0)->node_spanned_pages; - - 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); -} - -struct node_info { - unsigned int start; - unsigned int end; - int bootmap_pages; -}; - -/* - * FIXME: We really want to avoid allocating the bootmap bitmap - * over the top of the initrd. Hopefully, this is located towards - * the start of a bank, so if we allocate the bootmap bitmap at - * the end, we won't clash. - */ -static unsigned int __init -find_bootmap_pfn(struct meminfo *mi, unsigned int bootmap_pages) -{ - unsigned int start_pfn, bootmap_pfn; - unsigned int start, end; - - start_pfn = PFN_UP((unsigned long)&_end); - bootmap_pfn = 0; - - /* ARM26 machines only have one node */ - if (mi->bank->node != 0) - BUG(); - - start = PFN_UP(mi->bank->start); - end = PFN_DOWN(mi->bank->size + mi->bank->start); - - if (start < start_pfn) - start = start_pfn; - - if (end <= start) - BUG(); - - if (end - start >= bootmap_pages) - bootmap_pfn = start; - else - BUG(); - - return bootmap_pfn; -} - -/* - * Scan the memory info structure and pull out: - * - the end of memory - * - the number of nodes - * - the pfn range of each node - * - the number of bootmem bitmap pages - */ -static void __init -find_memend_and_nodes(struct meminfo *mi, struct node_info *np) -{ - unsigned int memend_pfn = 0; - - nodes_clear(node_online_map); - node_set_online(0); - - np->bootmap_pages = 0; - - if (mi->bank->size == 0) { - BUG(); - } - - /* - * Get the start and end pfns for this bank - */ - np->start = PFN_UP(mi->bank->start); - np->end = PFN_DOWN(mi->bank->start + mi->bank->size); - - if (memend_pfn < np->end) - memend_pfn = np->end; - - /* - * Calculate the number of pages we require to - * store the bootmem bitmaps. - */ - np->bootmap_pages = bootmem_bootmap_pages(np->end - np->start); - - /* - * This doesn't seem to be used by the Linux memory - * manager any more. If we can get rid of it, we - * also get rid of some of the stuff above as well. - */ - max_low_pfn = memend_pfn - PFN_DOWN(PHYS_OFFSET); - max_pfn = memend_pfn - PFN_DOWN(PHYS_OFFSET); - mi->end = memend_pfn << PAGE_SHIFT; - -} - -/* - * Initialise the bootmem allocator for all nodes. This is called - * early during the architecture specific initialisation. - */ -void __init bootmem_init(struct meminfo *mi) -{ - struct node_info node_info; - unsigned int bootmap_pfn; - pg_data_t *pgdat = NODE_DATA(0); - - find_memend_and_nodes(mi, &node_info); - - bootmap_pfn = find_bootmap_pfn(mi, node_info.bootmap_pages); - - /* - * Note that node 0 must always have some pages. - */ - if (node_info.end == 0) - BUG(); - - /* - * Initialise the bootmem allocator. - */ - init_bootmem_node(pgdat, bootmap_pfn, node_info.start, node_info.end); - - /* - * Register all available RAM in this node with the bootmem allocator. - */ - free_bootmem_node(pgdat, mi->bank->start, mi->bank->size); - - /* - * Register the kernel text and data with bootmem. - * Note: with XIP we dont register .text since - * its in ROM. - */ -#ifdef CONFIG_XIP_KERNEL - reserve_bootmem_node(pgdat, __pa(&_sdata), &_end - &_sdata); -#else - reserve_bootmem_node(pgdat, __pa(&_stext), &_end - &_stext); -#endif - - /* - * And don't forget to reserve the allocator bitmap, - * which will be freed later. - */ - reserve_bootmem_node(pgdat, bootmap_pfn << PAGE_SHIFT, - node_info.bootmap_pages << PAGE_SHIFT); - - /* - * These should likewise go elsewhere. They pre-reserve - * the screen memory region at the start of main system - * memory. FIXME - screen RAM is not 512K! - */ - reserve_bootmem_node(pgdat, 0x02000000, 0x00080000); - -#ifdef CONFIG_BLK_DEV_INITRD - initrd_start = phys_initrd_start; - initrd_end = initrd_start + phys_initrd_size; - - /* Achimedes machines only have one node, so initrd is in node 0 */ -#ifdef CONFIG_XIP_KERNEL - /* Only reserve initrd space if it is in RAM */ - if(initrd_start && initrd_start < 0x03000000){ -#else - if(initrd_start){ -#endif - reserve_bootmem_node(pgdat, __pa(initrd_start), - initrd_end - initrd_start); - } -#endif /* CONFIG_BLK_DEV_INITRD */ - - -} - -/* - * paging_init() sets up the page tables, initialises the zone memory - * maps, and sets up the zero page, bad page and bad page tables. - */ -void __init paging_init(struct meminfo *mi) -{ - void *zero_page; - unsigned long zone_size[MAX_NR_ZONES]; - unsigned long zhole_size[MAX_NR_ZONES]; - struct bootmem_data *bdata; - pg_data_t *pgdat; - int i; - - memcpy(&meminfo, mi, sizeof(meminfo)); - - /* - * allocate the zero page. Note that we count on this going ok. - */ - zero_page = alloc_bootmem_low_pages(PAGE_SIZE); - - /* - * initialise the page tables. - */ - memtable_init(mi); - flush_tlb_all(); - - /* - * initialise the zones in node 0 (archimedes have only 1 node) - */ - - for (i = 0; i < MAX_NR_ZONES; i++) { - zone_size[i] = 0; - zhole_size[i] = 0; - } - - pgdat = NODE_DATA(0); - bdata = pgdat->bdata; - zone_size[0] = bdata->node_low_pfn - - (bdata->node_boot_start >> PAGE_SHIFT); - if (!zone_size[0]) - BUG(); - pgdat->node_mem_map = NULL; - free_area_init_node(0, pgdat, zone_size, - bdata->node_boot_start >> PAGE_SHIFT, zhole_size); - - /* - * finish off the bad pages once - * the mem_map is initialised - */ - memzero(zero_page, PAGE_SIZE); - empty_zero_page = virt_to_page(zero_page); -} - -static inline void free_area(unsigned long addr, unsigned long end, char *s) -{ - unsigned int size = (end - addr) >> 10; - - for (; addr < end; addr += PAGE_SIZE) { - struct page *page = virt_to_page(addr); - ClearPageReserved(page); - init_page_count(page); - free_page(addr); - totalram_pages++; - } - - if (size && s) - printk(KERN_INFO "Freeing %s memory: %dK\n", s, size); -} - -/* - * 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 int codepages, datapages, initpages; - pg_data_t *pgdat = NODE_DATA(0); - extern int sysctl_overcommit_memory; - - - /* Note: data pages includes BSS */ -#ifdef CONFIG_XIP_KERNEL - codepages = &_endtext - &_text; - datapages = &_end - &_sdata; -#else - codepages = &_etext - &_text; - datapages = &_end - &_etext; -#endif - initpages = &__init_end - &__init_begin; - - high_memory = (void *)__va(meminfo.end); - max_mapnr = virt_to_page(high_memory) - mem_map; - - /* this will put all unused low memory onto the freelists */ - if (pgdat->node_spanned_pages != 0) - totalram_pages += free_all_bootmem_node(pgdat); - - num_physpages = meminfo.bank[0].size >> PAGE_SHIFT; - - printk(KERN_INFO "Memory: %luMB total\n", num_physpages >> (20 - PAGE_SHIFT)); - printk(KERN_NOTICE "Memory: %luKB available (%dK code, " - "%dK data, %dK init)\n", - (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), - codepages >> 10, datapages >> 10, initpages >> 10); - - /* - * Turn on overcommit on tiny machines - */ - if (PAGE_SIZE >= 16384 && num_physpages <= 128) { - sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; - printk("Turning on overcommit\n"); - } -} - -void free_initmem(void){ -#ifndef CONFIG_XIP_KERNEL - free_area((unsigned long)(&__init_begin), - (unsigned long)(&__init_end), - "init"); -#endif -} - -#ifdef CONFIG_BLK_DEV_INITRD - -static int keep_initrd; - -void free_initrd_mem(unsigned long start, unsigned long end) -{ -#ifdef CONFIG_XIP_KERNEL - /* Only bin initrd if it is in RAM... */ - if(!keep_initrd && start < 0x03000000) -#else - if (!keep_initrd) -#endif - free_area(start, end, "initrd"); -} - -static int __init keepinitrd_setup(char *__unused) -{ - keep_initrd = 1; - return 1; -} - -__setup("keepinitrd", keepinitrd_setup); -#endif |