s390/mm: introduce defines to reflect the hardware mmu

Add various defines like e.g. _REGION1_SHIFT to reflect the hardware
mmu. We have quite a bit code that does not make use of the Linux
memory management primitives but directly modifies page, segment and
region values.

Most of this is open-coded like e.g. "1UL << 53". In order to clean
this up introduce a couple of new defines. The existing Linux memory
management defines are changed, so the mapping to the hardware
implementation is reflected.

Reviewed-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens
2017-06-16 17:24:39 +02:00
committed by Martin Schwidefsky
parent a31a00ba7c
commit c67da7c7c5
3 changed files with 57 additions and 23 deletions

View File

@@ -10,10 +10,14 @@
#include <linux/const.h>
#include <asm/types.h>
#define _PAGE_SHIFT 12
#define _PAGE_SIZE (_AC(1, UL) << _PAGE_SHIFT)
#define _PAGE_MASK (~(_PAGE_SIZE - 1))
/* PAGE_SHIFT determines the page size */
#define PAGE_SHIFT 12
#define PAGE_SIZE (_AC(1,UL) << PAGE_SHIFT)
#define PAGE_MASK (~(PAGE_SIZE-1))
#define PAGE_SHIFT _PAGE_SHIFT
#define PAGE_SIZE _PAGE_SIZE
#define PAGE_MASK _PAGE_MASK
#define PAGE_DEFAULT_ACC 0
#define PAGE_DEFAULT_KEY (PAGE_DEFAULT_ACC << 4)