From 18da236908793abccebc6f365fbe6e95a5b41db0 Mon Sep 17 00:00:00 2001 From: Heiko Carstens Date: Mon, 8 Oct 2012 09:18:26 +0200 Subject: 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 Signed-off-by: Martin Schwidefsky --- arch/s390/include/asm/pgtable.h | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'arch/s390/include') 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) { /* -- cgit v1.2.3-70-g09d2