Commit | Line | Data |
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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> |
37efe642 | 13 | #include <asm/sections.h> |
5924486d | 14 | #include <asm/page.h> |
3ff1559e | 15 | #include <asm/mach/arch.h> |
5924486d | 16 | |
d111e8f9 RK |
17 | #include "mm.h" |
18 | ||
d111e8f9 RK |
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 | |
37efe642 | 29 | reserve_bootmem_node(pgdat, __pa(_data), _end - _data, |
72a7fe39 | 30 | BOOTMEM_DEFAULT); |
d111e8f9 | 31 | #else |
37efe642 | 32 | reserve_bootmem_node(pgdat, __pa(_stext), _end - _stext, |
72a7fe39 | 33 | BOOTMEM_DEFAULT); |
d111e8f9 RK |
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 | */ | |
72a7fe39 BW |
41 | reserve_bootmem_node(pgdat, CONFIG_VECTORS_BASE, PAGE_SIZE, |
42 | BOOTMEM_DEFAULT); | |
d111e8f9 RK |
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 | */ | |
4b5f32ce | 49 | void __init paging_init(struct machine_desc *mdesc) |
d111e8f9 | 50 | { |
4b5f32ce | 51 | bootmem_init(); |
d111e8f9 RK |
52 | } |
53 | ||
80878d6c RK |
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 | ||
e6b1b38c RK |
61 | void flush_dcache_page(struct page *page) |
62 | { | |
63 | __cpuc_flush_dcache_page(page_address(page)); | |
64 | } | |
3e361225 | 65 | EXPORT_SYMBOL(flush_dcache_page); |
e6b1b38c | 66 | |
3603ab2b RK |
67 | void __iomem *__arm_ioremap_pfn(unsigned long pfn, unsigned long offset, |
68 | size_t size, unsigned int mtype) | |
5924486d RK |
69 | { |
70 | if (pfn >= (0x100000000ULL >> PAGE_SHIFT)) | |
71 | return NULL; | |
72 | return (void __iomem *) (offset + (pfn << PAGE_SHIFT)); | |
73 | } | |
3603ab2b | 74 | EXPORT_SYMBOL(__arm_ioremap_pfn); |
5924486d | 75 | |
3603ab2b RK |
76 | void __iomem *__arm_ioremap(unsigned long phys_addr, size_t size, |
77 | unsigned int mtype) | |
5924486d RK |
78 | { |
79 | return (void __iomem *)phys_addr; | |
80 | } | |
3603ab2b | 81 | EXPORT_SYMBOL(__arm_ioremap); |
5924486d | 82 | |
3ff1559e | 83 | void __iounmap(volatile void __iomem *addr) |
5924486d RK |
84 | { |
85 | } | |
86 | EXPORT_SYMBOL(__iounmap); |