2 * Copyright 2010 Tilera Corporation. All Rights Reserved.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation, version 2.
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
11 * NON INFRINGEMENT. See the GNU General Public License for
16 #ifndef _ASM_TILE_PGTABLE_32_H
17 #define _ASM_TILE_PGTABLE_32_H
20 * The level-1 index is defined by the huge page size. A PGD is composed
21 * of PTRS_PER_PGD pgd_t's and is the top level of the page table.
23 #define PGDIR_SHIFT HV_LOG2_PAGE_SIZE_LARGE
24 #define PGDIR_SIZE HV_PAGE_SIZE_LARGE
25 #define PGDIR_MASK (~(PGDIR_SIZE-1))
26 #define PTRS_PER_PGD (1 << (32 - PGDIR_SHIFT))
29 * The level-2 index is defined by the difference between the huge
30 * page size and the normal page size. A PTE is composed of
31 * PTRS_PER_PTE pte_t's and is the bottom level of the page table.
32 * Note that the hypervisor docs use PTE for what we call pte_t, so
33 * this nomenclature is somewhat confusing.
35 #define PTRS_PER_PTE (1 << (HV_LOG2_PAGE_SIZE_LARGE - HV_LOG2_PAGE_SIZE_SMALL))
40 * Right now we initialize only a single pte table. It can be extended
41 * easily, subsequent pte tables have to be allocated in one physical
44 * HOWEVER, if we are using an allocation scheme with slop after the
45 * end of the page table (e.g. where our L2 page tables are 2KB but
46 * our pages are 64KB and we are allocating via the page allocator)
47 * we can't extend it easily.
49 #define LAST_PKMAP PTRS_PER_PTE
51 #define PKMAP_BASE ((FIXADDR_BOOT_START - PAGE_SIZE*LAST_PKMAP) & PGDIR_MASK)
54 # define __VMAPPING_END (PKMAP_BASE & ~(HPAGE_SIZE-1))
56 # define __VMAPPING_END (FIXADDR_START & ~(HPAGE_SIZE-1))
59 #ifdef CONFIG_HUGEVMAP
60 #define HUGE_VMAP_END __VMAPPING_END
61 #define HUGE_VMAP_BASE (HUGE_VMAP_END - CONFIG_NR_HUGE_VMAPS * HPAGE_SIZE)
62 #define _VMALLOC_END HUGE_VMAP_BASE
64 #define _VMALLOC_END __VMAPPING_END
68 * Align the vmalloc area to an L2 page table, and leave a guard page
69 * at the beginning and end. The vmalloc code also puts in an internal
70 * guard page between each allocation.
72 #define VMALLOC_END (_VMALLOC_END - PAGE_SIZE)
73 extern unsigned long VMALLOC_RESERVE /* = CONFIG_VMALLOC_RESERVE */;
74 #define _VMALLOC_START (_VMALLOC_END - VMALLOC_RESERVE)
75 #define VMALLOC_START (_VMALLOC_START + PAGE_SIZE)
77 /* This is the maximum possible amount of lowmem. */
78 #define MAXMEM (_VMALLOC_START - PAGE_OFFSET)
80 /* We have no pmd or pud since we are strictly a two-level page table */
81 #include <asm-generic/pgtable-nopmd.h>
83 /* We don't define any pgds for these addresses. */
84 static inline int pgd_addr_invalid(unsigned long addr)
86 return addr >= MEM_HV_INTRPT;
90 * Provide versions of these routines that can be used safely when
91 * the hypervisor may be asynchronously modifying dirty/accessed bits.
93 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
94 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
96 extern int ptep_test_and_clear_young(struct vm_area_struct *,
97 unsigned long addr, pte_t *);
98 extern void ptep_set_wrprotect(struct mm_struct *,
99 unsigned long addr, pte_t *);
101 /* Create a pmd from a PTFN. */
102 static inline pmd_t ptfn_pmd(unsigned long ptfn, pgprot_t prot)
104 return (pmd_t){ { hv_pte_set_ptfn(prot, ptfn) } };
107 /* Return the page-table frame number (ptfn) that a pmd_t points at. */
108 #define pmd_ptfn(pmd) hv_pte_get_ptfn((pmd).pud.pgd)
110 static inline void pmd_clear(pmd_t *pmdp)
112 __pte_clear(&pmdp->pud.pgd);
115 #endif /* __ASSEMBLY__ */
117 #endif /* _ASM_TILE_PGTABLE_32_H */