LXR linux/arch/arm/mm/nommu.c

   1/*
   2 *  linux/arch/arm/mm/nommu.c
   3 *
   4 * ARM uCLinux supporting functions.
   5 */
   6#include <linux/module.h>
   7#include <linux/mm.h>
   8#include <linux/pagemap.h>
   9#include <linux/bootmem.h>
  10#include <linux/io.h>
  11
  12#include <asm/cacheflush.h>
  13#include <asm/sections.h>
  14#include <asm/page.h>
  15#include <asm/setup.h>
  16#include <asm/mach/arch.h>
  17
  18#include "mm.h"
  19
  20/*
  21 * Reserve the various regions of node 0
  22 */
  23void __init reserve_node_zero(pg_data_t *pgdat)
  24{
  25        /*
  26         * Register the kernel text and data with bootmem.
  27         * Note that this can only be in node 0.
  28         */
  29#ifdef CONFIG_XIP_KERNEL
  30        reserve_bootmem_node(pgdat, __pa(_data), _end - _data,
  31                        BOOTMEM_DEFAULT);
  32#else
  33        reserve_bootmem_node(pgdat, __pa(_stext), _end - _stext,
  34                        BOOTMEM_DEFAULT);
  35#endif
  36
  37        /*
  38         * Register the exception vector page.
  39         * some architectures which the DRAM is the exception vector to trap,
  40         * alloc_page breaks with error, although it is not NULL, but "0."
  41         */
  42        reserve_bootmem_node(pgdat, CONFIG_VECTORS_BASE, PAGE_SIZE,
  43                        BOOTMEM_DEFAULT);
  44}
  45
  46/*
  47 * paging_init() sets up the page tables, initialises the zone memory
  48 * maps, and sets up the zero page, bad page and bad page tables.
  49 */
  50void __init paging_init(struct machine_desc *mdesc)
  51{
  52        bootmem_init();
  53}
  54
  55/*
  56 * We don't need to do anything here for nommu machines.
  57 */
  58void setup_mm_for_reboot(char mode)
  59{
  60}
  61
  62void flush_dcache_page(struct page *page)
  63{
  64        __cpuc_flush_dcache_page(page_address(page));
  65}
  66EXPORT_SYMBOL(flush_dcache_page);
  67
  68void __iomem *__arm_ioremap_pfn(unsigned long pfn, unsigned long offset,
  69                                size_t size, unsigned int mtype)
  70{
  71        if (pfn >= (0x100000000ULL >> PAGE_SHIFT))
  72                return NULL;
  73        return (void __iomem *) (offset + (pfn << PAGE_SHIFT));
  74}
  75EXPORT_SYMBOL(__arm_ioremap_pfn);
  76
  77void __iomem *__arm_ioremap(unsigned long phys_addr, size_t size,
  78                            unsigned int mtype)
  79{
  80        return (void __iomem *)phys_addr;
  81}
  82EXPORT_SYMBOL(__arm_ioremap);
  83
  84void __iounmap(volatile void __iomem *addr)
  85{
  86}
  87EXPORT_SYMBOL(__iounmap);
  88