2 * linux/arch/arm/mm/nommu.c
4 * ARM uCLinux supporting functions.
6 #include <linux/module.h>
8 #include <linux/pagemap.h>
10 #include <linux/memblock.h>
12 #include <asm/cacheflush.h>
13 #include <asm/sections.h>
15 #include <asm/setup.h>
16 #include <asm/traps.h>
17 #include <asm/mach/arch.h>
21 void __init arm_mm_memblock_reserve(void)
23 #ifndef CONFIG_CPU_V7M
25 * Register the exception vector page.
26 * some architectures which the DRAM is the exception vector to trap,
27 * alloc_page breaks with error, although it is not NULL, but "0."
29 memblock_reserve(CONFIG_VECTORS_BASE, PAGE_SIZE);
30 #else /* ifndef CONFIG_CPU_V7M */
32 * There is no dedicated vector page on V7-M. So nothing needs to be
38 void __init sanity_check_meminfo(void)
40 phys_addr_t end = bank_phys_end(&meminfo.bank[meminfo.nr_banks - 1]);
41 high_memory = __va(end - 1) + 1;
45 * paging_init() sets up the page tables, initialises the zone memory
46 * maps, and sets up the zero page, bad page and bad page tables.
48 void __init paging_init(struct machine_desc *mdesc)
50 early_trap_init((void *)CONFIG_VECTORS_BASE);
55 * We don't need to do anything here for nommu machines.
57 void setup_mm_for_reboot(void)
61 void flush_dcache_page(struct page *page)
63 __cpuc_flush_dcache_area(page_address(page), PAGE_SIZE);
65 EXPORT_SYMBOL(flush_dcache_page);
67 void flush_kernel_dcache_page(struct page *page)
69 __cpuc_flush_dcache_area(page_address(page), PAGE_SIZE);
71 EXPORT_SYMBOL(flush_kernel_dcache_page);
73 void copy_to_user_page(struct vm_area_struct *vma, struct page *page,
74 unsigned long uaddr, void *dst, const void *src,
77 memcpy(dst, src, len);
78 if (vma->vm_flags & VM_EXEC)
79 __cpuc_coherent_user_range(uaddr, uaddr + len);
82 void __iomem *__arm_ioremap_pfn(unsigned long pfn, unsigned long offset,
83 size_t size, unsigned int mtype)
85 if (pfn >= (0x100000000ULL >> PAGE_SHIFT))
87 return (void __iomem *) (offset + (pfn << PAGE_SHIFT));
89 EXPORT_SYMBOL(__arm_ioremap_pfn);
91 void __iomem *__arm_ioremap_pfn_caller(unsigned long pfn, unsigned long offset,
92 size_t size, unsigned int mtype, void *caller)
94 return __arm_ioremap_pfn(pfn, offset, size, mtype);
97 void __iomem *__arm_ioremap(unsigned long phys_addr, size_t size,
100 return (void __iomem *)phys_addr;
102 EXPORT_SYMBOL(__arm_ioremap);
104 void __iomem * (*arch_ioremap_caller)(unsigned long, size_t, unsigned int, void *);
106 void __iomem *__arm_ioremap_caller(unsigned long phys_addr, size_t size,
107 unsigned int mtype, void *caller)
109 return __arm_ioremap(phys_addr, size, mtype);
112 void (*arch_iounmap)(volatile void __iomem *);
114 void __arm_iounmap(volatile void __iomem *addr)
117 EXPORT_SYMBOL(__arm_iounmap);