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5924486d RK |
1 | /* |
2 | * linux/arch/arm/mm/nommu.c | |
3 | * | |
4 | * ARM uCLinux supporting functions. | |
5 | */ | |
6 | #include <linux/module.h> | |
e6b1b38c RK |
7 | #include <linux/mm.h> |
8 | #include <linux/pagemap.h> | |
3ff1559e | 9 | #include <linux/bootmem.h> |
fced80c7 | 10 | #include <linux/io.h> |
5924486d | 11 | |
e6b1b38c | 12 | #include <asm/cacheflush.h> |
5924486d | 13 | #include <asm/page.h> |
3ff1559e | 14 | #include <asm/mach/arch.h> |
5924486d | 15 | |
d111e8f9 RK |
16 | #include "mm.h" |
17 | ||
d111e8f9 RK |
18 | /* |
19 | * Reserve the various regions of node 0 | |
20 | */ | |
21 | void __init reserve_node_zero(pg_data_t *pgdat) | |
22 | { | |
23 | /* | |
24 | * Register the kernel text and data with bootmem. | |
25 | * Note that this can only be in node 0. | |
26 | */ | |
27 | #ifdef CONFIG_XIP_KERNEL | |
72a7fe39 BW |
28 | reserve_bootmem_node(pgdat, __pa(&__data_start), &_end - &__data_start, |
29 | BOOTMEM_DEFAULT); | |
d111e8f9 | 30 | #else |
72a7fe39 BW |
31 | reserve_bootmem_node(pgdat, __pa(&_stext), &_end - &_stext, |
32 | BOOTMEM_DEFAULT); | |
d111e8f9 RK |
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 | */ | |
72a7fe39 BW |
40 | reserve_bootmem_node(pgdat, CONFIG_VECTORS_BASE, PAGE_SIZE, |
41 | BOOTMEM_DEFAULT); | |
d111e8f9 RK |
42 | } |
43 | ||
44 | /* | |
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. | |
47 | */ | |
4b5f32ce | 48 | void __init paging_init(struct machine_desc *mdesc) |
d111e8f9 | 49 | { |
4b5f32ce | 50 | bootmem_init(); |
d111e8f9 RK |
51 | } |
52 | ||
80878d6c RK |
53 | /* |
54 | * We don't need to do anything here for nommu machines. | |
55 | */ | |
56 | void setup_mm_for_reboot(char mode) | |
57 | { | |
58 | } | |
59 | ||
e6b1b38c RK |
60 | void flush_dcache_page(struct page *page) |
61 | { | |
62 | __cpuc_flush_dcache_page(page_address(page)); | |
63 | } | |
3e361225 | 64 | EXPORT_SYMBOL(flush_dcache_page); |
e6b1b38c | 65 | |
3603ab2b RK |
66 | void __iomem *__arm_ioremap_pfn(unsigned long pfn, unsigned long offset, |
67 | size_t size, unsigned int mtype) | |
5924486d RK |
68 | { |
69 | if (pfn >= (0x100000000ULL >> PAGE_SHIFT)) | |
70 | return NULL; | |
71 | return (void __iomem *) (offset + (pfn << PAGE_SHIFT)); | |
72 | } | |
3603ab2b | 73 | EXPORT_SYMBOL(__arm_ioremap_pfn); |
5924486d | 74 | |
3603ab2b RK |
75 | void __iomem *__arm_ioremap(unsigned long phys_addr, size_t size, |
76 | unsigned int mtype) | |
5924486d RK |
77 | { |
78 | return (void __iomem *)phys_addr; | |
79 | } | |
3603ab2b | 80 | EXPORT_SYMBOL(__arm_ioremap); |
5924486d | 81 | |
3ff1559e | 82 | void __iounmap(volatile void __iomem *addr) |
5924486d RK |
83 | { |
84 | } | |
85 | EXPORT_SYMBOL(__iounmap); |