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