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authorHeiko Carstens <heiko.carstens@de.ibm.com>2012-10-08 09:18:26 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2012-11-23 11:14:24 +0100
commit18da236908793abccebc6f365fbe6e95a5b41db0 (patch)
tree34899d0c737b625660a44f2b47436e5e82a17511 /arch/s390/include/asm
parent26d29d06ea020411559f75ec908db235ca1838d9 (diff)
s390/mm,vmem: use 2GB frames for identity mapping
Use 2GB frames for indentity mapping if EDAT2 is available to reduce TLB pressure. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/include/asm')
-rw-r--r--arch/s390/include/asm/pgtable.h10
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h
index 2d3b7cb2600..0eefb9e192d 100644
--- a/arch/s390/include/asm/pgtable.h
+++ b/arch/s390/include/asm/pgtable.h
@@ -345,6 +345,8 @@ extern unsigned long MODULES_END;
#define _REGION3_ENTRY (_REGION_ENTRY_TYPE_R3 | _REGION_ENTRY_LENGTH)
#define _REGION3_ENTRY_EMPTY (_REGION_ENTRY_TYPE_R3 | _REGION_ENTRY_INV)
+#define _REGION3_ENTRY_LARGE 0x400 /* RTTE-format control, large page */
+
/* Bits in the segment table entry */
#define _SEGMENT_ENTRY_ORIGIN ~0x7ffUL/* segment table origin */
#define _SEGMENT_ENTRY_RO 0x200 /* page protection bit */
@@ -444,6 +446,7 @@ static inline int pgd_bad(pgd_t pgd) { return 0; }
static inline int pud_present(pud_t pud) { return 1; }
static inline int pud_none(pud_t pud) { return 0; }
+static inline int pud_large(pud_t pud) { return 0; }
static inline int pud_bad(pud_t pud) { return 0; }
#else /* CONFIG_64BIT */
@@ -489,6 +492,13 @@ static inline int pud_none(pud_t pud)
return (pud_val(pud) & _REGION_ENTRY_INV) != 0UL;
}
+static inline int pud_large(pud_t pud)
+{
+ if ((pud_val(pud) & _REGION_ENTRY_TYPE_MASK) != _REGION_ENTRY_TYPE_R3)
+ return 0;
+ return !!(pud_val(pud) & _REGION3_ENTRY_LARGE);
+}
+
static inline int pud_bad(pud_t pud)
{
/*