D7net
Home
Console
Upload
information
Create File
Create Folder
About
Tools
:
/
lib
/
modules
/
4.4.0-1128-aws
/
build
/
arch
/
tile
/
include
/
asm
/
Filename :
pgtable_32.h
back
Copy
/* * 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 */