diff options
Diffstat (limited to 'arch/sparc/include/asm/pgtable_64.h')
| -rw-r--r-- | arch/sparc/include/asm/pgtable_64.h | 24 |
1 files changed, 7 insertions, 17 deletions
diff --git a/arch/sparc/include/asm/pgtable_64.h b/arch/sparc/include/asm/pgtable_64.h index 387d484c62f9..a7b5091f3b13 100644 --- a/arch/sparc/include/asm/pgtable_64.h +++ b/arch/sparc/include/asm/pgtable_64.h @@ -45,40 +45,30 @@ #define vmemmap ((struct page *)VMEMMAP_BASE) -/* XXX All of this needs to be rethought so we can take advantage - * XXX cheetah's full 64-bit virtual address space, ie. no more hole - * XXX in the middle like on spitfire. -DaveM - */ -/* - * Given a virtual address, the lowest PAGE_SHIFT bits determine offset - * into the page; the next higher PAGE_SHIFT-3 bits determine the pte# - * in the proper pagetable (the -3 is from the 8 byte ptes, and each page - * table is a single page long). The next higher PMD_BITS determine pmd# - * in the proper pmdtable (where we must have PMD_BITS <= (PAGE_SHIFT-2) - * since the pmd entries are 4 bytes, and each pmd page is a single page - * long). Finally, the higher few bits determine pgde#. - */ - /* PMD_SHIFT determines the size of the area a second-level page * table can map */ -#define PMD_SHIFT (PAGE_SHIFT + (PAGE_SHIFT-3)) +#define PMD_SHIFT (PAGE_SHIFT + (PAGE_SHIFT-4)) #define PMD_SIZE (_AC(1,UL) << PMD_SHIFT) #define PMD_MASK (~(PMD_SIZE-1)) #define PMD_BITS (PAGE_SHIFT - 2) /* PGDIR_SHIFT determines what a third-level page table entry can map */ -#define PGDIR_SHIFT (PAGE_SHIFT + (PAGE_SHIFT-3) + PMD_BITS) +#define PGDIR_SHIFT (PAGE_SHIFT + (PAGE_SHIFT-4) + PMD_BITS) #define PGDIR_SIZE (_AC(1,UL) << PGDIR_SHIFT) #define PGDIR_MASK (~(PGDIR_SIZE-1)) #define PGDIR_BITS (PAGE_SHIFT - 2) +#if (PGDIR_SHIFT + PGDIR_BITS) != 44 +#error Page table parameters do not cover virtual address space properly. +#endif + #ifndef __ASSEMBLY__ #include <linux/sched.h> /* Entries per page directory level. */ -#define PTRS_PER_PTE (1UL << (PAGE_SHIFT-3)) +#define PTRS_PER_PTE (1UL << (PAGE_SHIFT-4)) #define PTRS_PER_PMD (1UL << PMD_BITS) #define PTRS_PER_PGD (1UL << PGDIR_BITS) |
