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sparc64: Document PGD and PMD layout.

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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 <davem@davemloft.net>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
David Miller 2012-10-08 16:34:23 -07:00 committed by Linus Torvalds
parent c460bec78d
commit dbc9fdf063
2 changed files with 16 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
arch/sparc/include/asm/pgtable_64.h
View File

@ -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 <linux/sched.h>
@ -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))<<PMD_PADDR_SHIFT)))
#define pmd_page(pmd) virt_to_page((void *)__pmd_page(pmd))
#define pud_page_vaddr(pud) \
((unsigned long) __va((((unsigned long)pud_val(pud))<<11UL)))
((unsigned long) __va((((unsigned long)pud_val(pud))<<PGD_PADDR_SHIFT)))
#define pud_page(pud) virt_to_page((void *)pud_page_vaddr(pud))
#define pmd_none(pmd) (!pmd_val(pmd))
#define pmd_bad(pmd) (0)

8
arch/sparc/include/asm/tsb.h
View File

@ -147,13 +147,13 @@ extern struct tsb_phys_patch_entry __tsb_phys_patch, __tsb_phys_patch_end;
brz,pn REG1, FAIL_LABEL; \
sllx VADDR, 64 - (PMD_SHIFT + PMD_BITS), REG2; \
srlx REG2, 64 - PAGE_SHIFT, REG2; \
sllx REG1, 11, REG1; \
sllx REG1, PGD_PADDR_SHIFT, REG1; \
andn REG2, 0x3, REG2; \
lduwa [REG1 + REG2] ASI_PHYS_USE_EC, REG1; \
brz,pn REG1, FAIL_LABEL; \
sllx VADDR, 64 - PMD_SHIFT, REG2; \
srlx REG2, 64 - (PAGE_SHIFT - 1), REG2; \
sllx REG1, 11, REG1; \
sllx REG1, PMD_PADDR_SHIFT, REG1; \
andn REG2, 0x7, REG2; \
add REG1, REG2, REG1;
@ -172,13 +172,13 @@ extern struct tsb_phys_patch_entry __tsb_phys_patch, __tsb_phys_patch_end;
brz,pn REG1, FAIL_LABEL; \
sllx VADDR, 64 - (PMD_SHIFT + PMD_BITS), REG2; \
srlx REG2, 64 - PAGE_SHIFT, REG2; \
sllx REG1, 11, REG1; \
sllx REG1, PGD_PADDR_SHIFT, REG1; \
andn REG2, 0x3, REG2; \
lduwa [REG1 + REG2] ASI_PHYS_USE_EC, REG1; \
brz,pn REG1, FAIL_LABEL; \
sllx VADDR, 64 - PMD_SHIFT, REG2; \
srlx REG2, 64 - (PAGE_SHIFT - 1), REG2; \
sllx REG1, 11, REG1; \
sllx REG1, PMD_PADDR_SHIFT, REG1; \
andn REG2, 0x7, REG2; \
add REG1, REG2, REG1;