137 строки
3.7 KiB
C
137 строки
3.7 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/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 <linux/gfp.h>
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#include <asm/processor.h>
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#include <linux/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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unsigned long highstart_pfn, highend_pfn;
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#ifdef CONFIG_MN10300_HAS_ATOMIC_OPS_UNIT
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static struct vm_struct user_iomap_vm;
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#endif
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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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#ifdef CONFIG_MN10300_HAS_ATOMIC_OPS_UNIT
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/* The Atomic Operation Unit registers need to be mapped to userspace
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* for all processes. The following uses vm_area_register_early() to
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* reserve the first page of the vmalloc area and sets the pte for that
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* page.
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*
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* glibc hardcodes this virtual mapping, so we're pretty much stuck with
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* it from now on.
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*/
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user_iomap_vm.flags = VM_USERMAP;
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user_iomap_vm.size = 1 << PAGE_SHIFT;
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vm_area_register_early(&user_iomap_vm, PAGE_SIZE);
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ppte = kernel_vmalloc_ptes;
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set_pte(ppte, pfn_pte(USER_ATOMIC_OPS_PAGE_ADDR >> PAGE_SHIFT,
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PAGE_USERIO));
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#endif
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local_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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BUG_ON(!mem_map);
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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 = 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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free_all_bootmem();
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mem_init_print_info(NULL);
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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_initmem_default(POISON_FREE_INITMEM);
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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_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM,
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"initrd");
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}
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#endif
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