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[MIPS] Hook for platforms to define cachability of /dev/mem regions 

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Ralf Baechle 2007-07-10 17:32:56 +01:00
parent 8bb809df69
commit 24e9d0b96d
2 changed files with 17 additions and 0 deletions
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10
arch/mips/mm/cache.c
View File

@ -6,6 +6,8 @@
* Copyright (C) 1994 - 2003, 07 by Ralf Baechle (ralf@linux-mips.org)
* Copyright (C) 2007 MIPS Technologies, Inc.
*/
#include <linux/fs.h>
#include <linux/fcntl.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
@ -164,3 +166,11 @@ void __init cpu_cache_init(void)
panic(cache_panic);
}
int __weak __uncached_access(struct file *file, unsigned long addr)
{
if (file->f_flags & O_SYNC)
return 1;
return addr >= __pa(high_memory);
}

7
drivers/char/mem.c
View File

@ -75,6 +75,13 @@ static inline int uncached_access(struct file *file, unsigned long addr)
* On ia64, we ignore O_SYNC because we cannot tolerate memory attribute aliases.
*/
return !(efi_mem_attributes(addr) & EFI_MEMORY_WB);
#elif defined(CONFIG_MIPS)
{
extern int __uncached_access(struct file *file,
unsigned long addr);
return __uncached_access(file, addr);
}
#else
/*
* Accessing memory above the top the kernel knows about or through a file pointer