From dbc9fdf063dc4f12af71d7858bd216170129822e Mon Sep 17 00:00:00 2001 From: David Miller Date: Mon, 8 Oct 2012 16:34:23 -0700 Subject: sparc64: Document PGD and PMD layout. We're going to be messing around with the PMD interpretation and layout for the sake of transparent huge pages, so we better clearly document what we're starting with. Signed-off-by: David S. Miller Cc: Andrea Arcangeli Cc: Johannes Weiner Cc: Gerald Schaefer Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/sparc/include/asm/pgtable_64.h | 16 ++++++++++++---- 1 file changed, 12 insertions(+), 4 deletions(-) (limited to 'arch/sparc/include/asm/pgtable_64.h') diff --git a/arch/sparc/include/asm/pgtable_64.h b/arch/sparc/include/asm/pgtable_64.h index a7b5091f3b1..af3cd7a9e9a 100644 --- a/arch/sparc/include/asm/pgtable_64.h +++ b/arch/sparc/include/asm/pgtable_64.h @@ -63,6 +63,14 @@ #error Page table parameters do not cover virtual address space properly. #endif +/* PMDs point to PTE tables which are 4K aligned. */ +#define PMD_PADDR _AC(0xfffffffe,UL) +#define PMD_PADDR_SHIFT _AC(11,UL) + +/* PGDs point to PMD tables which are 8K aligned. */ +#define PGD_PADDR _AC(0xfffffffc,UL) +#define PGD_PADDR_SHIFT _AC(11,UL) + #ifndef __ASSEMBLY__ #include @@ -581,14 +589,14 @@ static inline unsigned long pte_special(pte_t pte) } #define pmd_set(pmdp, ptep) \ - (pmd_val(*(pmdp)) = (__pa((unsigned long) (ptep)) >> 11UL)) + (pmd_val(*(pmdp)) = (__pa((unsigned long) (ptep)) >> PMD_PADDR_SHIFT)) #define pud_set(pudp, pmdp) \ - (pud_val(*(pudp)) = (__pa((unsigned long) (pmdp)) >> 11UL)) + (pud_val(*(pudp)) = (__pa((unsigned long) (pmdp)) >> PGD_PADDR_SHIFT)) #define __pmd_page(pmd) \ - ((unsigned long) __va((((unsigned long)pmd_val(pmd))<<11UL))) + ((unsigned long) __va((((unsigned long)pmd_val(pmd))<