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 /* 31 * paging_init() sets up the page tables, initialises the zone memory 32 * maps, and sets up the zero page, bad page and bad page tables. 33 */ 34 void __init paging_init(struct machine_desc *mdesc) 35 { 36 bootmem_init(); 37 } 38 39 /* 40 * We don't need to do anything here for nommu machines. 41 */ 42 void setup_mm_for_reboot(char mode) 43 { 44 } 45 46 void flush_dcache_page(struct page *page) 47 { 48 __cpuc_flush_dcache_area(page_address(page), PAGE_SIZE); 49 } 50 EXPORT_SYMBOL(flush_dcache_page); 51 52 void copy_to_user_page(struct vm_area_struct *vma, struct page *page, 53 unsigned long uaddr, void *dst, const void *src, 54 unsigned long len) 55 { 56 memcpy(dst, src, len); 57 if (vma->vm_flags & VM_EXEC) 58 __cpuc_coherent_user_range(uaddr, uaddr + len); 59 } 60 61 void __iomem *__arm_ioremap_pfn(unsigned long pfn, unsigned long offset, 62 size_t size, unsigned int mtype) 63 { 64 if (pfn >= (0x100000000ULL >> PAGE_SHIFT)) 65 return NULL; 66 return (void __iomem *) (offset + (pfn << PAGE_SHIFT)); 67 } 68 EXPORT_SYMBOL(__arm_ioremap_pfn); 69 70 void __iomem *__arm_ioremap_pfn_caller(unsigned long pfn, unsigned long offset, 71 size_t size, unsigned int mtype, void *caller) 72 { 73 return __arm_ioremap_pfn(pfn, offset, size, mtype); 74 } 75 76 void __iomem *__arm_ioremap(unsigned long phys_addr, size_t size, 77 unsigned int mtype) 78 { 79 return (void __iomem *)phys_addr; 80 } 81 EXPORT_SYMBOL(__arm_ioremap); 82 83 void __iomem *__arm_ioremap_caller(unsigned long phys_addr, size_t size, 84 unsigned int mtype, void *caller) 85 { 86 return __arm_ioremap(phys_addr, size, mtype); 87 } 88 89 void __iounmap(volatile void __iomem *addr) 90 { 91 } 92 EXPORT_SYMBOL(__iounmap); 93