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/io.h>
  10#include <linux/memblock.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/traps.h>
  17#include <asm/mach/arch.h>
  18
  19#include "mm.h"
  20
  21void __init arm_mm_memblock_reserve(void)
  22{
  23        /*
  24         * Register the exception vector page.
  25         * some architectures which the DRAM is the exception vector to trap,
  26         * alloc_page breaks with error, although it is not NULL, but "0."
  27         */
  28        memblock_reserve(CONFIG_VECTORS_BASE, PAGE_SIZE);
  29}
  30
  31void __init sanity_check_meminfo(void)
  32{
  33        phys_addr_t end = bank_phys_end(&meminfo.bank[meminfo.nr_banks - 1]);
  34        high_memory = __va(end - 1) + 1;
  35}
  36
  37/*
  38 * paging_init() sets up the page tables, initialises the zone memory
  39 * maps, and sets up the zero page, bad page and bad page tables.
  40 */
  41void __init paging_init(struct machine_desc *mdesc)
  42{
  43        early_trap_init((void *)CONFIG_VECTORS_BASE);
  44        bootmem_init();
  45}
  46
  47/*
  48 * We don't need to do anything here for nommu machines.
  49 */
  50void setup_mm_for_reboot(void)
  51{
  52}
  53
  54void flush_dcache_page(struct page *page)
  55{
  56        __cpuc_flush_dcache_area(page_address(page), PAGE_SIZE);
  57}
  58EXPORT_SYMBOL(flush_dcache_page);
  59
  60void flush_kernel_dcache_page(struct page *page)
  61{
  62        __cpuc_flush_dcache_area(page_address(page), PAGE_SIZE);
  63}
  64EXPORT_SYMBOL(flush_kernel_dcache_page);
  65
  66void copy_to_user_page(struct vm_area_struct *vma, struct page *page,
  67                       unsigned long uaddr, void *dst, const void *src,
  68                       unsigned long len)
  69{
  70        memcpy(dst, src, len);
  71        if (vma->vm_flags & VM_EXEC)
  72                __cpuc_coherent_user_range(uaddr, uaddr + len);
  73}
  74
  75void __iomem *__arm_ioremap_pfn(unsigned long pfn, unsigned long offset,
  76                                size_t size, unsigned int mtype)
  77{
  78        if (pfn >= (0x100000000ULL >> PAGE_SHIFT))
  79                return NULL;
  80        return (void __iomem *) (offset + (pfn << PAGE_SHIFT));
  81}
  82EXPORT_SYMBOL(__arm_ioremap_pfn);
  83
  84void __iomem *__arm_ioremap_pfn_caller(unsigned long pfn, unsigned long offset,
  85                           size_t size, unsigned int mtype, void *caller)
  86{
  87        return __arm_ioremap_pfn(pfn, offset, size, mtype);
  88}
  89
  90void __iomem *__arm_ioremap(unsigned long phys_addr, size_t size,
  91                            unsigned int mtype)
  92{
  93        return (void __iomem *)phys_addr;
  94}
  95EXPORT_SYMBOL(__arm_ioremap);
  96
  97void __iomem * (*arch_ioremap_caller)(unsigned long, size_t, unsigned int, void *);
  98
  99void __iomem *__arm_ioremap_caller(unsigned long phys_addr, size_t size,
 100                                   unsigned int mtype, void *caller)
 101{
 102        return __arm_ioremap(phys_addr, size, mtype);
 103}
 104
 105void (*arch_iounmap)(volatile void __iomem *);
 106
 107void __arm_iounmap(volatile void __iomem *addr)
 108{
 109}
 110EXPORT_SYMBOL(__arm_iounmap);
 111