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/mach/arch.h> 16 17 #include "mm.h" 18 19 /* 20 * Reserve the various regions of node 0 21 */ 22 void __init reserve_node_zero(pg_data_t *pgdat) 23 { 24 /* 25 * Register the kernel text and data with bootmem. 26 * Note that this can only be in node 0. 27 */ 28 #ifdef CONFIG_XIP_KERNEL 29 reserve_bootmem_node(pgdat, __pa(_data), _end - _data, 30 BOOTMEM_DEFAULT); 31 #else 32 reserve_bootmem_node(pgdat, __pa(_stext), _end - _stext, 33 BOOTMEM_DEFAULT); 34 #endif 35 36 /* 37 * Register the exception vector page. 38 * some architectures which the DRAM is the exception vector to trap, 39 * alloc_page breaks with error, although it is not NULL, but "0." 40 */ 41 reserve_bootmem_node(pgdat, CONFIG_VECTORS_BASE, PAGE_SIZE, 42 BOOTMEM_DEFAULT); 43 } 44 45 /* 46 * paging_init() sets up the page tables, initialises the zone memory 47 * maps, and sets up the zero page, bad page and bad page tables. 48 */ 49 void __init paging_init(struct machine_desc *mdesc) 50 { 51 bootmem_init(); 52 } 53 54 /* 55 * We don't need to do anything here for nommu machines. 56 */ 57 void setup_mm_for_reboot(char mode) 58 { 59 } 60 61 void flush_dcache_page(struct page *page) 62 { 63 __cpuc_flush_dcache_page(page_address(page)); 64 } 65 EXPORT_SYMBOL(flush_dcache_page); 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(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 __iounmap(volatile void __iomem *addr) 84 { 85 } 86 EXPORT_SYMBOL(__iounmap); 87