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 } 29 30 void __init uncached_resize(unsigned long size) 31 { 32 uncached_size = size; 33 uncached_end = uncached_start + uncached_size; 34 } 35