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 11 #include <asm/cacheflush.h> 12 #include <asm/io.h> 13 #include <asm/page.h> 14 #include <asm/mach/arch.h> 15 16 #include "mm.h" 17 18 extern void _stext, __data_start, _end; 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_start), &_end - &__data_start, 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 meminfo *mi, struct machine_desc *mdesc) 51 { 52 bootmem_init(mi); 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_page(page_address(page)); 65 } 66 EXPORT_SYMBOL(flush_dcache_page); 67 68 void __iomem *__arm_ioremap_pfn(unsigned long pfn, unsigned long offset, 69 size_t size, unsigned int mtype) 70 { 71 if (pfn >= (0x100000000ULL >> PAGE_SHIFT)) 72 return NULL; 73 return (void __iomem *) (offset + (pfn << PAGE_SHIFT)); 74 } 75 EXPORT_SYMBOL(__arm_ioremap_pfn); 76 77 void __iomem *__arm_ioremap(unsigned long phys_addr, size_t size, 78 unsigned int mtype) 79 { 80 return (void __iomem *)phys_addr; 81 } 82 EXPORT_SYMBOL(__arm_ioremap); 83 84 void __iounmap(volatile void __iomem *addr) 85 { 86 } 87 EXPORT_SYMBOL(__iounmap); 88