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 phys_addr_t end = bank_phys_end(&meminfo.bank[meminfo.nr_banks - 1]); 33 high_memory = __va(end - 1) + 1; 34 } 35 36 /* 37 * paging_init() sets up the page tables, initialises the zone memory 38 * maps, and sets up the zero page, bad page and bad page tables. 39 */ 40 void __init paging_init(struct machine_desc *mdesc) 41 { 42 bootmem_init(); 43 } 44 45 /* 46 * We don't need to do anything here for nommu machines. 47 */ 48 void setup_mm_for_reboot(void) 49 { 50 } 51 52 void flush_dcache_page(struct page *page) 53 { 54 __cpuc_flush_dcache_area(page_address(page), PAGE_SIZE); 55 } 56 EXPORT_SYMBOL(flush_dcache_page); 57 58 void copy_to_user_page(struct vm_area_struct *vma, struct page *page, 59 unsigned long uaddr, void *dst, const void *src, 60 unsigned long len) 61 { 62 memcpy(dst, src, len); 63 if (vma->vm_flags & VM_EXEC) 64 __cpuc_coherent_user_range(uaddr, uaddr + len); 65 } 66 67 void __iomem *__arm_ioremap_pfn(unsigned long pfn, unsigned long offset, 68 size_t size, unsigned int mtype) 69 { 70 if (pfn >= (0x100000000ULL >> PAGE_SHIFT)) 71 return NULL; 72 return (void __iomem *) (offset + (pfn << PAGE_SHIFT)); 73 } 74 EXPORT_SYMBOL(__arm_ioremap_pfn); 75 76 void __iomem *__arm_ioremap_pfn_caller(unsigned long pfn, unsigned long offset, 77 size_t size, unsigned int mtype, void *caller) 78 { 79 return __arm_ioremap_pfn(pfn, offset, size, mtype); 80 } 81 82 void __iomem *__arm_ioremap(unsigned long phys_addr, size_t size, 83 unsigned int mtype) 84 { 85 return (void __iomem *)phys_addr; 86 } 87 EXPORT_SYMBOL(__arm_ioremap); 88 89 void __iomem * (*arch_ioremap_caller)(unsigned long, size_t, unsigned int, void *); 90 91 void __iomem *__arm_ioremap_caller(unsigned long phys_addr, size_t size, 92 unsigned int mtype, void *caller) 93 { 94 return __arm_ioremap(phys_addr, size, mtype); 95 } 96 97 void (*arch_iounmap)(volatile void __iomem *); 98 99 void __arm_iounmap(volatile void __iomem *addr) 100 { 101 } 102 EXPORT_SYMBOL(__arm_iounmap); 103