mirror of
https://github.com/torvalds/linux.git
synced 2024-11-28 15:11:31 +00:00
9edef28653
This adds some helper routines for uncached mapping support. This simplifies some of the cases where we need to check the uncached mapping boundaries in addition to giving us a centralized location for building more complex manipulation on top of. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
29 lines
816 B
C
29 lines
816 B
C
#include <linux/init.h>
|
|
#include <asm/sizes.h>
|
|
#include <asm/page.h>
|
|
|
|
/*
|
|
* This is the offset of the uncached section from its cached alias.
|
|
*
|
|
* Legacy platforms handle trivial transitions between cached and
|
|
* uncached segments by making use of the 1:1 mapping relationship in
|
|
* 512MB lowmem, others via a special uncached mapping.
|
|
*
|
|
* Default value only valid in 29 bit mode, in 32bit mode this will be
|
|
* updated by the early PMB initialization code.
|
|
*/
|
|
unsigned long cached_to_uncached = SZ_512M;
|
|
unsigned long uncached_size = SZ_512M;
|
|
unsigned long uncached_start, uncached_end;
|
|
|
|
int virt_addr_uncached(unsigned long kaddr)
|
|
{
|
|
return (kaddr >= uncached_start) && (kaddr < uncached_end);
|
|
}
|
|
|
|
void __init uncached_init(void)
|
|
{
|
|
uncached_start = memory_end;
|
|
uncached_end = uncached_start + uncached_size;
|
|
}
|