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/bootmem.h> 10 #include <linux/io.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 /* 21 * Reserve the various regions of node 0 22 */ 23 void __init reserve_node_zero(pg_data_t *pgdat) 24 { 25 /* 26 * Register the kernel text and data with bootmem. 27 * Note that this can only be in node 0. 28 */ 29 #ifdef CONFIG_XIP_KERNEL 30 reserve_bootmem_node(pgdat, __pa(_data), _end - _data, 31 BOOTMEM_DEFAULT); 32 #else 33 reserve_bootmem_node(pgdat, __pa(_stext), _end - _stext, 34 BOOTMEM_DEFAULT); 35 #endif 36 37 /* 38 * Register the exception vector page. 39 * some architectures which the DRAM is the exception vector to trap, 40 * alloc_page breaks with error, although it is not NULL, but "0." 41 */ 42 reserve_bootmem_node(pgdat, CONFIG_VECTORS_BASE, PAGE_SIZE, 43 BOOTMEM_DEFAULT); 44 } 45 46 /* 47 * paging_init() sets up the page tables, initialises the zone memory 48 * maps, and sets up the zero page, bad page and bad page tables. 49 */ 50 void __init paging_init(struct machine_desc *mdesc) 51 { 52 bootmem_init(); 53 } 54 55 /* 56 * We don't need to do anything here for nommu machines. 57 */ 58 void setup_mm_for_reboot(char mode) 59 { 60 } 61 62 void flush_dcache_page(struct page *page) 63 { 64 __cpuc_flush_dcache_area(page_address(page), PAGE_SIZE); 65 } 66 EXPORT_SYMBOL(flush_dcache_page); 67 68 void copy_to_user_page(struct vm_area_struct *vma, struct page *page, 69 unsigned long uaddr, void *dst, const void *src, 70 unsigned long len) 71 { 72 memcpy(dst, src, len); 73 if (vma->vm_flags & VM_EXEC) 74 __cpuc_coherent_user_range(uaddr, uaddr + len); 75 } 76 77 void __iomem *__arm_ioremap_pfn(unsigned long pfn, unsigned long offset, 78 size_t size, unsigned int mtype) 79 { 80 if (pfn >= (0x100000000ULL >> PAGE_SHIFT)) 81 return NULL; 82 return (void __iomem *) (offset + (pfn << PAGE_SHIFT)); 83 } 84 EXPORT_SYMBOL(__arm_ioremap_pfn); 85 86 void __iomem *__arm_ioremap_pfn_caller(unsigned long pfn, unsigned long offset, 87 size_t size, unsigned int mtype, void *caller) 88 { 89 return __arm_ioremap_pfn(pfn, offset, size, mtype); 90 } 91 92 void __iomem *__arm_ioremap(unsigned long phys_addr, size_t size, 93 unsigned int mtype) 94 { 95 return (void __iomem *)phys_addr; 96 } 97 EXPORT_SYMBOL(__arm_ioremap); 98 99 void __iomem *__arm_ioremap_caller(unsigned long phys_addr, size_t size, 100 unsigned int mtype, void *caller) 101 { 102 return __arm_ioremap(phys_addr, size, mtype); 103 } 104 105 void __iounmap(volatile void __iomem *addr) 106 { 107 } 108 EXPORT_SYMBOL(__iounmap); 109