194 lines
5.2 KiB
C
194 lines
5.2 KiB
C
/*
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* linux/arch/m68knommu/mm/init.c
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*
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* Copyright (C) 1998 D. Jeff Dionne <jeff@lineo.ca>,
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* Kenneth Albanowski <kjahds@kjahds.com>,
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* Copyright (C) 2000 Lineo, Inc. (www.lineo.com)
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*
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* Based on:
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*
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* linux/arch/m68k/mm/init.c
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*
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* Copyright (C) 1995 Hamish Macdonald
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*
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* JAN/1999 -- hacked to support ColdFire (gerg@snapgear.com)
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* DEC/2000 -- linux 2.4 support <davidm@snapgear.com>
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*/
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#include <linux/signal.h>
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/types.h>
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#include <linux/ptrace.h>
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#include <linux/mman.h>
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#include <linux/mm.h>
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#include <linux/swap.h>
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#include <linux/init.h>
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#include <linux/highmem.h>
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#include <linux/pagemap.h>
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#include <linux/bootmem.h>
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#include <linux/slab.h>
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#include <asm/setup.h>
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#include <asm/segment.h>
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#include <asm/page.h>
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#include <asm/pgtable.h>
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#include <asm/system.h>
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#include <asm/machdep.h>
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#undef DEBUG
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extern void die_if_kernel(char *,struct pt_regs *,long);
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extern void free_initmem(void);
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/*
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* BAD_PAGE is the page that is used for page faults when linux
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* is out-of-memory. Older versions of linux just did a
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* do_exit(), but using this instead means there is less risk
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* for a process dying in kernel mode, possibly leaving a inode
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* unused etc..
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*
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* BAD_PAGETABLE is the accompanying page-table: it is initialized
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* to point to BAD_PAGE entries.
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*
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* ZERO_PAGE is a special page that is used for zero-initialized
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* data and COW.
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*/
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static unsigned long empty_bad_page_table;
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static unsigned long empty_bad_page;
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unsigned long empty_zero_page;
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extern unsigned long memory_start;
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extern unsigned long memory_end;
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/*
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* paging_init() continues the virtual memory environment setup which
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* was begun by the code in arch/head.S.
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* The parameters are pointers to where to stick the starting and ending
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* addresses of available kernel virtual memory.
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*/
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void __init paging_init(void)
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{
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/*
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* Make sure start_mem is page aligned, otherwise bootmem and
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* page_alloc get different views of the world.
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*/
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#ifdef DEBUG
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unsigned long start_mem = PAGE_ALIGN(memory_start);
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#endif
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unsigned long end_mem = memory_end & PAGE_MASK;
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#ifdef DEBUG
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printk (KERN_DEBUG "start_mem is %#lx\nvirtual_end is %#lx\n",
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start_mem, end_mem);
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#endif
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/*
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* Initialize the bad page table and bad page to point
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* to a couple of allocated pages.
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*/
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empty_bad_page_table = (unsigned long)alloc_bootmem_pages(PAGE_SIZE);
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empty_bad_page = (unsigned long)alloc_bootmem_pages(PAGE_SIZE);
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empty_zero_page = (unsigned long)alloc_bootmem_pages(PAGE_SIZE);
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memset((void *)empty_zero_page, 0, PAGE_SIZE);
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/*
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* Set up SFC/DFC registers (user data space).
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*/
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set_fs (USER_DS);
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#ifdef DEBUG
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printk (KERN_DEBUG "before free_area_init\n");
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printk (KERN_DEBUG "free_area_init -> start_mem is %#lx\nvirtual_end is %#lx\n",
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start_mem, end_mem);
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#endif
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{
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unsigned long zones_size[MAX_NR_ZONES] = {0, };
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zones_size[ZONE_DMA] = (end_mem - PAGE_OFFSET) >> PAGE_SHIFT;
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free_area_init(zones_size);
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}
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}
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void __init mem_init(void)
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{
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int codek = 0, datak = 0, initk = 0;
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unsigned long tmp;
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extern char _etext, _stext, _sdata, _ebss, __init_begin, __init_end;
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extern unsigned int _ramend, _rambase;
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unsigned long len = _ramend - _rambase;
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unsigned long start_mem = memory_start; /* DAVIDM - these must start at end of kernel */
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unsigned long end_mem = memory_end; /* DAVIDM - this must not include kernel stack at top */
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pr_debug("Mem_init: start=%lx, end=%lx\n", start_mem, end_mem);
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end_mem &= PAGE_MASK;
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high_memory = (void *) end_mem;
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start_mem = PAGE_ALIGN(start_mem);
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max_mapnr = num_physpages = (((unsigned long) high_memory) - PAGE_OFFSET) >> PAGE_SHIFT;
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/* this will put all memory onto the freelists */
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totalram_pages = free_all_bootmem();
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codek = (&_etext - &_stext) >> 10;
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datak = (&_ebss - &_sdata) >> 10;
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initk = (&__init_begin - &__init_end) >> 10;
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tmp = nr_free_pages() << PAGE_SHIFT;
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printk(KERN_INFO "Memory available: %luk/%luk RAM, (%dk kernel code, %dk data)\n",
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tmp >> 10,
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len >> 10,
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codek,
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datak
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);
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}
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#ifdef CONFIG_BLK_DEV_INITRD
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void free_initrd_mem(unsigned long start, unsigned long end)
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{
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int pages = 0;
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for (; start < end; start += PAGE_SIZE) {
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ClearPageReserved(virt_to_page(start));
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init_page_count(virt_to_page(start));
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free_page(start);
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totalram_pages++;
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pages++;
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}
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printk (KERN_NOTICE "Freeing initrd memory: %dk freed\n", pages * (PAGE_SIZE / 1024));
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}
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#endif
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void
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free_initmem()
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{
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#ifdef CONFIG_RAMKERNEL
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unsigned long addr;
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extern char __init_begin, __init_end;
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/*
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* The following code should be cool even if these sections
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* are not page aligned.
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*/
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addr = PAGE_ALIGN((unsigned long)(&__init_begin));
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/* next to check that the page we free is not a partial page */
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for (; addr + PAGE_SIZE < (unsigned long)(&__init_end); addr +=PAGE_SIZE) {
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ClearPageReserved(virt_to_page(addr));
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init_page_count(virt_to_page(addr));
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free_page(addr);
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totalram_pages++;
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}
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printk(KERN_NOTICE "Freeing unused kernel memory: %ldk freed (0x%x - 0x%x)\n",
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(addr - PAGE_ALIGN((long) &__init_begin)) >> 10,
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(int)(PAGE_ALIGN((unsigned long)(&__init_begin))),
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(int)(addr - PAGE_SIZE));
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#endif
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}
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