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
  21 void __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
  31 void __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  */
  41 void __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  */
  50 void setup_mm_for_reboot(void)
  51 {
  52 }
  53
  54 void flush_dcache_page(struct page *page)
  55 {
  56         __cpuc_flush_dcache_area(page_address(page), PAGE_SIZE);
  57 }
  58 EXPORT_SYMBOL(flush_dcache_page);
  59
  60 void copy_to_user_page(struct vm_area_struct *vma, struct page *page,
  61                        unsigned long uaddr, void *dst, const void *src,
  62                        unsigned long len)
  63 {
  64         memcpy(dst, src, len);
  65         if (vma->vm_flags & VM_EXEC)
  66                 __cpuc_coherent_user_range(uaddr, uaddr + len);
  67 }
  68
  69 void __iomem *__arm_ioremap_pfn(unsigned long pfn, unsigned long offset,
  70                                 size_t size, unsigned int mtype)
  71 {
  72         if (pfn >= (0x100000000ULL >> PAGE_SHIFT))
  73                 return NULL;
  74         return (void __iomem *) (offset + (pfn << PAGE_SHIFT));
  75 }
  76 EXPORT_SYMBOL(__arm_ioremap_pfn);
  77
  78 void __iomem *__arm_ioremap_pfn_caller(unsigned long pfn, unsigned long offset,
  79                            size_t size, unsigned int mtype, void *caller)
  80 {
  81         return __arm_ioremap_pfn(pfn, offset, size, mtype);
  82 }
  83
  84 void __iomem *__arm_ioremap(unsigned long phys_addr, size_t size,
  85                             unsigned int mtype)
  86 {
  87         return (void __iomem *)phys_addr;
  88 }
  89 EXPORT_SYMBOL(__arm_ioremap);
  90
  91 void __iomem * (*arch_ioremap_caller)(unsigned long, size_t, unsigned int, void *);
  92
  93 void __iomem *__arm_ioremap_caller(unsigned long phys_addr, size_t size,
  94                                    unsigned int mtype, void *caller)
  95 {
  96         return __arm_ioremap(phys_addr, size, mtype);
  97 }
  98
  99 void (*arch_iounmap)(volatile void __iomem *);
 100
 101 void __arm_iounmap(volatile void __iomem *addr)
 102 {
 103 }
 104 EXPORT_SYMBOL(__arm_iounmap);