161 lines
4.3 KiB
C
161 lines
4.3 KiB
C
/* MN10300 Memory management initialisation
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*
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* Copyright (C) 2007 Matsushita Electric Industrial Co., Ltd.
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* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
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* Modified by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public Licence
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* as published by the Free Software Foundation; either version
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* 2 of the Licence, or (at your option) any later version.
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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/slab.h>
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#include <linux/fs.h>
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#include <linux/mm.h>
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#include <linux/swap.h>
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#include <linux/smp.h>
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#include <linux/init.h>
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#include <linux/initrd.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 <asm/processor.h>
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#include <asm/system.h>
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#include <asm/uaccess.h>
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#include <asm/pgtable.h>
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#include <asm/pgalloc.h>
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#include <asm/dma.h>
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#include <asm/tlb.h>
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#include <asm/sections.h>
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DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
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unsigned long highstart_pfn, highend_pfn;
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/*
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* set up paging
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*/
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void __init paging_init(void)
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{
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unsigned long zones_size[MAX_NR_ZONES] = {0,};
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pte_t *ppte;
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int loop;
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/* main kernel space -> RAM mapping is handled as 1:1 transparent by
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* the MMU */
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memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir));
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memset(kernel_vmalloc_ptes, 0, sizeof(kernel_vmalloc_ptes));
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/* load the VMALLOC area PTE table addresses into the kernel PGD */
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ppte = kernel_vmalloc_ptes;
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for (loop = VMALLOC_START / (PAGE_SIZE * PTRS_PER_PTE);
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loop < VMALLOC_END / (PAGE_SIZE * PTRS_PER_PTE);
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loop++
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) {
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set_pgd(swapper_pg_dir + loop, __pgd(__pa(ppte) | _PAGE_TABLE));
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ppte += PAGE_SIZE / sizeof(pte_t);
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}
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/* declare the sizes of the RAM zones (only use the normal zone) */
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zones_size[ZONE_NORMAL] =
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contig_page_data.bdata->node_low_pfn -
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contig_page_data.bdata->node_min_pfn;
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/* pass the memory from the bootmem allocator to the main allocator */
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free_area_init(zones_size);
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__flush_tlb_all();
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}
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/*
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* transfer all the memory from the bootmem allocator to the runtime allocator
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*/
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void __init mem_init(void)
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{
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int codesize, reservedpages, datasize, initsize;
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int tmp;
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if (!mem_map)
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BUG();
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#define START_PFN (contig_page_data.bdata->node_min_pfn)
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#define MAX_LOW_PFN (contig_page_data.bdata->node_low_pfn)
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max_mapnr = num_physpages = MAX_LOW_PFN - START_PFN;
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high_memory = (void *) __va(MAX_LOW_PFN * PAGE_SIZE);
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/* clear the zero-page */
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memset(empty_zero_page, 0, PAGE_SIZE);
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/* this will put all low memory onto the freelists */
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totalram_pages += free_all_bootmem();
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reservedpages = 0;
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for (tmp = 0; tmp < num_physpages; tmp++)
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if (PageReserved(&mem_map[tmp]))
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reservedpages++;
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codesize = (unsigned long) &_etext - (unsigned long) &_stext;
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datasize = (unsigned long) &_edata - (unsigned long) &_etext;
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initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
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printk(KERN_INFO
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"Memory: %luk/%luk available"
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" (%dk kernel code, %dk reserved, %dk data, %dk init,"
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" %ldk highmem)\n",
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nr_free_pages() << (PAGE_SHIFT - 10),
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max_mapnr << (PAGE_SHIFT - 10),
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codesize >> 10,
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reservedpages << (PAGE_SHIFT - 10),
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datasize >> 10,
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initsize >> 10,
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(unsigned long) (totalhigh_pages << (PAGE_SHIFT - 10))
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);
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}
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/*
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*
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*/
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void free_init_pages(char *what, unsigned long begin, unsigned long end)
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{
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unsigned long addr;
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for (addr = begin; addr < 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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memset((void *) addr, 0xcc, PAGE_SIZE);
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free_page(addr);
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totalram_pages++;
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}
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printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10);
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}
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/*
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* recycle memory containing stuff only required for initialisation
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*/
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void free_initmem(void)
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{
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free_init_pages("unused kernel memory",
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(unsigned long) &__init_begin,
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(unsigned long) &__init_end);
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}
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/*
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* dispose of the memory on which the initial ramdisk resided
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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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free_init_pages("initrd memory", start, end);
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}
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#endif
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