| Paul Mundt | 9edef28 | 2010-02-17 16:28:00 +0900 | [diff] [blame^] | 1 | #include <linux/init.h> |
| 2 | #include <asm/sizes.h> |
| 3 | #include <asm/page.h> |
| 4 | |
| 5 | /* |
| 6 | * This is the offset of the uncached section from its cached alias. |
| 7 | * |
| 8 | * Legacy platforms handle trivial transitions between cached and |
| 9 | * uncached segments by making use of the 1:1 mapping relationship in |
| 10 | * 512MB lowmem, others via a special uncached mapping. |
| 11 | * |
| 12 | * Default value only valid in 29 bit mode, in 32bit mode this will be |
| 13 | * updated by the early PMB initialization code. |
| 14 | */ |
| 15 | unsigned long cached_to_uncached = SZ_512M; |
| 16 | unsigned long uncached_size = SZ_512M; |
| 17 | unsigned long uncached_start, uncached_end; |
| 18 | |
| 19 | int virt_addr_uncached(unsigned long kaddr) |
| 20 | { |
| 21 | return (kaddr >= uncached_start) && (kaddr < uncached_end); |
| 22 | } |
| 23 | |
| 24 | void __init uncached_init(void) |
| 25 | { |
| 26 | uncached_start = memory_end; |
| 27 | uncached_end = uncached_start + uncached_size; |
| 28 | } |