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); 97