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
arm_mm_memblock_reserve(void)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 /*
31 * paging_init() sets up the page tables, initialises the zone memory
32 * maps, and sets up the zero page, bad page and bad page tables.
33 */
paging_init(struct machine_desc * mdesc)34 void __init paging_init(struct machine_desc *mdesc)
35 {
36 bootmem_init();
37 }
38
39 /*
40 * We don't need to do anything here for nommu machines.
41 */
setup_mm_for_reboot(char mode)42 void setup_mm_for_reboot(char mode)
43 {
44 }
45
flush_dcache_page(struct page * page)46 void flush_dcache_page(struct page *page)
47 {
48 __cpuc_flush_dcache_area(page_address(page), PAGE_SIZE);
49 }
50 EXPORT_SYMBOL(flush_dcache_page);
51
copy_to_user_page(struct vm_area_struct * vma,struct page * page,unsigned long uaddr,void * dst,const void * src,unsigned long len)52 void copy_to_user_page(struct vm_area_struct *vma, struct page *page,
53 unsigned long uaddr, void *dst, const void *src,
54 unsigned long len)
55 {
56 memcpy(dst, src, len);
57 if (vma->vm_flags & VM_EXEC)
58 __cpuc_coherent_user_range(uaddr, uaddr + len);
59 }
60
__arm_ioremap_pfn(unsigned long pfn,unsigned long offset,size_t size,unsigned int mtype)61 void __iomem *__arm_ioremap_pfn(unsigned long pfn, unsigned long offset,
62 size_t size, unsigned int mtype)
63 {
64 if (pfn >= (0x100000000ULL >> PAGE_SHIFT))
65 return NULL;
66 return (void __iomem *) (offset + (pfn << PAGE_SHIFT));
67 }
68 EXPORT_SYMBOL(__arm_ioremap_pfn);
69
__arm_ioremap_pfn_caller(unsigned long pfn,unsigned long offset,size_t size,unsigned int mtype,void * caller)70 void __iomem *__arm_ioremap_pfn_caller(unsigned long pfn, unsigned long offset,
71 size_t size, unsigned int mtype, void *caller)
72 {
73 return __arm_ioremap_pfn(pfn, offset, size, mtype);
74 }
75
__arm_ioremap(unsigned long phys_addr,size_t size,unsigned int mtype)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
__arm_ioremap_caller(unsigned long phys_addr,size_t size,unsigned int mtype,void * caller)83 void __iomem *__arm_ioremap_caller(unsigned long phys_addr, size_t size,
84 unsigned int mtype, void *caller)
85 {
86 return __arm_ioremap(phys_addr, size, mtype);
87 }
88
__iounmap(volatile void __iomem * addr)89 void __iounmap(volatile void __iomem *addr)
90 {
91 }
92 EXPORT_SYMBOL(__iounmap);
93