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
18extern void _stext, __data_start, _end;
19
20/*
21 * Reserve the various regions of node 0
22 */
23void __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#else
32	reserve_bootmem_node(pgdat, __pa(&_stext), &_end - &_stext);
33#endif
34
35	/*
36	 * Register the exception vector page.
37	 * some architectures which the DRAM is the exception vector to trap,
38	 * alloc_page breaks with error, although it is not NULL, but "0."
39	 */
40	reserve_bootmem_node(pgdat, CONFIG_VECTORS_BASE, PAGE_SIZE);
41}
42
43/*
44 * paging_init() sets up the page tables, initialises the zone memory
45 * maps, and sets up the zero page, bad page and bad page tables.
46 */
47void __init paging_init(struct meminfo *mi, struct machine_desc *mdesc)
48{
49	bootmem_init(mi);
50}
51
52/*
53 * We don't need to do anything here for nommu machines.
54 */
55void setup_mm_for_reboot(char mode)
56{
57}
58
59void flush_dcache_page(struct page *page)
60{
61	__cpuc_flush_dcache_page(page_address(page));
62}
63EXPORT_SYMBOL(flush_dcache_page);
64
65void __iomem *__arm_ioremap_pfn(unsigned long pfn, unsigned long offset,
66				size_t size, unsigned int mtype)
67{
68	if (pfn >= (0x100000000ULL >> PAGE_SHIFT))
69		return NULL;
70	return (void __iomem *) (offset + (pfn << PAGE_SHIFT));
71}
72EXPORT_SYMBOL(__arm_ioremap_pfn);
73
74void __iomem *__arm_ioremap(unsigned long phys_addr, size_t size,
75			    unsigned int mtype)
76{
77	return (void __iomem *)phys_addr;
78}
79EXPORT_SYMBOL(__arm_ioremap);
80
81void __iounmap(volatile void __iomem *addr)
82{
83}
84EXPORT_SYMBOL(__iounmap);
85