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9edef286 PM |
1 | #include <linux/init.h> |
2 | #include <asm/sizes.h> | |
3 | #include <asm/page.h> | |
40d1f004 | 4 | #include <asm/addrspace.h> |
9edef286 PM |
5 | |
6 | /* | |
7 | * This is the offset of the uncached section from its cached alias. | |
8 | * | |
9 | * Legacy platforms handle trivial transitions between cached and | |
10 | * uncached segments by making use of the 1:1 mapping relationship in | |
11 | * 512MB lowmem, others via a special uncached mapping. | |
12 | * | |
13 | * Default value only valid in 29 bit mode, in 32bit mode this will be | |
14 | * updated by the early PMB initialization code. | |
15 | */ | |
16 | unsigned long cached_to_uncached = SZ_512M; | |
17 | unsigned long uncached_size = SZ_512M; | |
18 | unsigned long uncached_start, uncached_end; | |
19 | ||
20 | int virt_addr_uncached(unsigned long kaddr) | |
21 | { | |
22 | return (kaddr >= uncached_start) && (kaddr < uncached_end); | |
23 | } | |
24 | ||
25 | void __init uncached_init(void) | |
26 | { | |
40d1f004 PM |
27 | #ifdef CONFIG_29BIT |
28 | uncached_start = P2SEG; | |
29 | #else | |
9edef286 | 30 | uncached_start = memory_end; |
40d1f004 | 31 | #endif |
9edef286 PM |
32 | uncached_end = uncached_start + uncached_size; |
33 | } | |
d01447b3 PM |
34 | |
35 | void __init uncached_resize(unsigned long size) | |
36 | { | |
37 | uncached_size = size; | |
38 | uncached_end = uncached_start + uncached_size; | |
39 | } |