Commit | Line | Data |
---|---|---|
9edef286 | 1 | #include <linux/init.h> |
5b34d1ee | 2 | #include <linux/module.h> |
9edef286 PM |
3 | #include <asm/sizes.h> |
4 | #include <asm/page.h> | |
40d1f004 | 5 | #include <asm/addrspace.h> |
9edef286 PM |
6 | |
7 | /* | |
8 | * This is the offset of the uncached section from its cached alias. | |
9 | * | |
10 | * Legacy platforms handle trivial transitions between cached and | |
11 | * uncached segments by making use of the 1:1 mapping relationship in | |
12 | * 512MB lowmem, others via a special uncached mapping. | |
13 | * | |
14 | * Default value only valid in 29 bit mode, in 32bit mode this will be | |
15 | * updated by the early PMB initialization code. | |
16 | */ | |
17 | unsigned long cached_to_uncached = SZ_512M; | |
18 | unsigned long uncached_size = SZ_512M; | |
19 | unsigned long uncached_start, uncached_end; | |
5b34d1ee PM |
20 | EXPORT_SYMBOL(uncached_start); |
21 | EXPORT_SYMBOL(uncached_end); | |
9edef286 PM |
22 | |
23 | int virt_addr_uncached(unsigned long kaddr) | |
24 | { | |
25 | return (kaddr >= uncached_start) && (kaddr < uncached_end); | |
26 | } | |
5b34d1ee | 27 | EXPORT_SYMBOL(virt_addr_uncached); |
9edef286 PM |
28 | |
29 | void __init uncached_init(void) | |
30 | { | |
e2fcf74f | 31 | #if defined(CONFIG_29BIT) || !defined(CONFIG_MMU) |
40d1f004 PM |
32 | uncached_start = P2SEG; |
33 | #else | |
9edef286 | 34 | uncached_start = memory_end; |
40d1f004 | 35 | #endif |
9edef286 PM |
36 | uncached_end = uncached_start + uncached_size; |
37 | } | |
d01447b3 PM |
38 | |
39 | void __init uncached_resize(unsigned long size) | |
40 | { | |
41 | uncached_size = size; | |
42 | uncached_end = uncached_start + uncached_size; | |
43 | } |