/* * linux/arch/m68knommu/mm/init.c * * Copyright (C) 1998 D. Jeff Dionne <jeff@lineo.ca>, * Kenneth Albanowski <kjahds@kjahds.com>, * Copyright (C) 2000 Lineo, Inc. (www.lineo.com) * * Based on: * * linux/arch/m68k/mm/init.c * * Copyright (C) 1995 Hamish Macdonald * * JAN/1999 -- hacked to support ColdFire (gerg@snapgear.com) * DEC/2000 -- linux 2.4 support <davidm@snapgear.com> */ #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/init.h> #include <linux/highmem.h> #include <linux/pagemap.h> #include <linux/bootmem.h> #include <linux/gfp.h> #include <asm/setup.h> #include <asm/sections.h> #include <asm/segment.h> #include <asm/page.h> #include <asm/pgtable.h> #include <asm/system.h> #include <asm/machdep.h> /* * ZERO_PAGE is a special page that is used for zero-initialized * data and COW. */ void *empty_zero_page; /* * paging_init() continues the virtual memory environment setup which * was begun by the code in arch/head.S. * The parameters are pointers to where to stick the starting and ending * addresses of available kernel virtual memory. */ void __init paging_init(void) { /* * Make sure start_mem is page aligned, otherwise bootmem and * page_alloc get different views of the world. */ unsigned long end_mem = memory_end & PAGE_MASK; unsigned long zones_size[MAX_NR_ZONES] = {0, }; empty_zero_page = alloc_bootmem_pages(PAGE_SIZE); memset(empty_zero_page, 0, PAGE_SIZE); /* * Set up SFC/DFC registers (user data space). */ set_fs (USER_DS); zones_size[ZONE_DMA] = (end_mem - PAGE_OFFSET) >> PAGE_SHIFT; free_area_init(zones_size); } void __init mem_init(void) { int codek = 0, datak = 0, initk = 0; unsigned long tmp; unsigned long len = _ramend - _rambase; unsigned long start_mem = memory_start; /* DAVIDM - these must start at end of kernel */ unsigned long end_mem = memory_end; /* DAVIDM - this must not include kernel stack at top */ pr_debug("Mem_init: start=%lx, end=%lx\n", start_mem, end_mem); end_mem &= PAGE_MASK; high_memory = (void *) end_mem; start_mem = PAGE_ALIGN(start_mem); max_mapnr = num_physpages = (((unsigned long) high_memory) - PAGE_OFFSET) >> PAGE_SHIFT; /* this will put all memory onto the freelists */ totalram_pages = free_all_bootmem(); codek = (_etext - _stext) >> 10; datak = (_ebss - _sdata) >> 10; initk = (__init_begin - __init_end) >> 10; tmp = nr_free_pages() << PAGE_SHIFT; printk(KERN_INFO "Memory available: %luk/%luk RAM, (%dk kernel code, %dk data)\n", tmp >> 10, len >> 10, codek, datak ); } #ifdef CONFIG_BLK_DEV_INITRD void free_initrd_mem(unsigned long start, unsigned long end) { int pages = 0; for (; start < end; start += PAGE_SIZE) { ClearPageReserved(virt_to_page(start)); init_page_count(virt_to_page(start)); free_page(start); totalram_pages++; pages++; } pr_notice("Freeing initrd memory: %luk freed\n", pages * (PAGE_SIZE / 1024)); } #endif void free_initmem(void) { #ifdef CONFIG_RAMKERNEL unsigned long addr; /* * The following code should be cool even if these sections * are not page aligned. */ addr = PAGE_ALIGN((unsigned long) __init_begin); /* next to check that the page we free is not a partial page */ for (; addr + PAGE_SIZE < ((unsigned long) __init_end); addr += PAGE_SIZE) { ClearPageReserved(virt_to_page(addr)); init_page_count(virt_to_page(addr)); free_page(addr); totalram_pages++; } pr_notice("Freeing unused kernel memory: %luk freed (0x%x - 0x%x)\n", (addr - PAGE_ALIGN((unsigned long) __init_begin)) >> 10, (int)(PAGE_ALIGN((unsigned long) __init_begin)), (int)(addr - PAGE_SIZE)); #endif }