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- /*
- * Copyright 2010 Tilera Corporation. All Rights Reserved.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation, version 2.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
- * NON INFRINGEMENT. See the GNU General Public License for
- * more details.
- *
- */
- #ifndef _ASM_TILE_PGTABLE_32_H
- #define _ASM_TILE_PGTABLE_32_H
- /*
- * The level-1 index is defined by the huge page size. A PGD is composed
- * of PTRS_PER_PGD pgd_t's and is the top level of the page table.
- */
- #define PGDIR_SHIFT HPAGE_SHIFT
- #define PGDIR_SIZE HPAGE_SIZE
- #define PGDIR_MASK (~(PGDIR_SIZE-1))
- #define PTRS_PER_PGD _HV_L1_ENTRIES(HPAGE_SHIFT)
- #define PGD_INDEX(va) _HV_L1_INDEX(va, HPAGE_SHIFT)
- #define SIZEOF_PGD _HV_L1_SIZE(HPAGE_SHIFT)
- /*
- * The level-2 index is defined by the difference between the huge
- * page size and the normal page size. A PTE is composed of
- * PTRS_PER_PTE pte_t's and is the bottom level of the page table.
- * Note that the hypervisor docs use PTE for what we call pte_t, so
- * this nomenclature is somewhat confusing.
- */
- #define PTRS_PER_PTE _HV_L2_ENTRIES(HPAGE_SHIFT, PAGE_SHIFT)
- #define PTE_INDEX(va) _HV_L2_INDEX(va, HPAGE_SHIFT, PAGE_SHIFT)
- #define SIZEOF_PTE _HV_L2_SIZE(HPAGE_SHIFT, PAGE_SHIFT)
- #ifndef __ASSEMBLY__
- /*
- * Right now we initialize only a single pte table. It can be extended
- * easily, subsequent pte tables have to be allocated in one physical
- * chunk of RAM.
- *
- * HOWEVER, if we are using an allocation scheme with slop after the
- * end of the page table (e.g. where our L2 page tables are 2KB but
- * our pages are 64KB and we are allocating via the page allocator)
- * we can't extend it easily.
- */
- #define LAST_PKMAP PTRS_PER_PTE
- #define PKMAP_BASE ((FIXADDR_BOOT_START - PAGE_SIZE*LAST_PKMAP) & PGDIR_MASK)
- #ifdef CONFIG_HIGHMEM
- # define _VMALLOC_END (PKMAP_BASE & ~(HPAGE_SIZE-1))
- #else
- # define _VMALLOC_END (FIXADDR_START & ~(HPAGE_SIZE-1))
- #endif
- /*
- * Align the vmalloc area to an L2 page table, and leave a guard page
- * at the beginning and end. The vmalloc code also puts in an internal
- * guard page between each allocation.
- */
- #define VMALLOC_END (_VMALLOC_END - PAGE_SIZE)
- extern unsigned long VMALLOC_RESERVE /* = CONFIG_VMALLOC_RESERVE */;
- #define _VMALLOC_START (_VMALLOC_END - VMALLOC_RESERVE)
- #define VMALLOC_START (_VMALLOC_START + PAGE_SIZE)
- /* This is the maximum possible amount of lowmem. */
- #define MAXMEM (_VMALLOC_START - PAGE_OFFSET)
- /* We have no pmd or pud since we are strictly a two-level page table */
- #include <asm-generic/pgtable-nopmd.h>
- static inline int pud_huge_page(pud_t pud) { return 0; }
- /* We don't define any pgds for these addresses. */
- static inline int pgd_addr_invalid(unsigned long addr)
- {
- return addr >= MEM_HV_START;
- }
- /*
- * Provide versions of these routines that can be used safely when
- * the hypervisor may be asynchronously modifying dirty/accessed bits.
- * ptep_get_and_clear() matches the generic one but we provide it to
- * be parallel with the 64-bit code.
- */
- #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
- #define __HAVE_ARCH_PTEP_SET_WRPROTECT
- extern int ptep_test_and_clear_young(struct vm_area_struct *,
- unsigned long addr, pte_t *);
- extern void ptep_set_wrprotect(struct mm_struct *,
- unsigned long addr, pte_t *);
- #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
- static inline pte_t ptep_get_and_clear(struct mm_struct *mm,
- unsigned long addr, pte_t *ptep)
- {
- pte_t pte = *ptep;
- pte_clear(_mm, addr, ptep);
- return pte;
- }
- /*
- * pmds are wrappers around pgds, which are the same as ptes.
- * It's often convenient to "cast" back and forth and use the pte methods,
- * which are the methods supplied by the hypervisor.
- */
- #define pmd_pte(pmd) ((pmd).pud.pgd)
- #define pmdp_ptep(pmdp) (&(pmdp)->pud.pgd)
- #define pte_pmd(pte) ((pmd_t){ { (pte) } })
- #endif /* __ASSEMBLY__ */
- #endif /* _ASM_TILE_PGTABLE_32_H */
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