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/arch/x86/include/asm/pgtable_64.h

https://bitbucket.org/ndreys/linux-sunxi
C++ Header | 187 lines | 126 code | 40 blank | 21 comment | 3 complexity | c7c71c99ce0a51fce00beefdf2337b9c MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
  1#ifndef _ASM_X86_PGTABLE_64_H
  2#define _ASM_X86_PGTABLE_64_H
  3
  4#include <linux/const.h>
  5#include <asm/pgtable_64_types.h>
  6
  7#ifndef __ASSEMBLY__
  8
  9/*
 10 * This file contains the functions and defines necessary to modify and use
 11 * the x86-64 page table tree.
 12 */
 13#include <asm/processor.h>
 14#include <linux/bitops.h>
 15#include <linux/threads.h>
 16
 17extern pud_t level3_kernel_pgt[512];
 18extern pud_t level3_ident_pgt[512];
 19extern pmd_t level2_kernel_pgt[512];
 20extern pmd_t level2_fixmap_pgt[512];
 21extern pmd_t level2_ident_pgt[512];
 22extern pgd_t init_level4_pgt[];
 23
 24#define swapper_pg_dir init_level4_pgt
 25
 26extern void paging_init(void);
 27
 28#define pte_ERROR(e)					\
 29	printk("%s:%d: bad pte %p(%016lx).\n",		\
 30	       __FILE__, __LINE__, &(e), pte_val(e))
 31#define pmd_ERROR(e)					\
 32	printk("%s:%d: bad pmd %p(%016lx).\n",		\
 33	       __FILE__, __LINE__, &(e), pmd_val(e))
 34#define pud_ERROR(e)					\
 35	printk("%s:%d: bad pud %p(%016lx).\n",		\
 36	       __FILE__, __LINE__, &(e), pud_val(e))
 37#define pgd_ERROR(e)					\
 38	printk("%s:%d: bad pgd %p(%016lx).\n",		\
 39	       __FILE__, __LINE__, &(e), pgd_val(e))
 40
 41struct mm_struct;
 42
 43void set_pte_vaddr_pud(pud_t *pud_page, unsigned long vaddr, pte_t new_pte);
 44
 45
 46static inline void native_pte_clear(struct mm_struct *mm, unsigned long addr,
 47				    pte_t *ptep)
 48{
 49	*ptep = native_make_pte(0);
 50}
 51
 52static inline void native_set_pte(pte_t *ptep, pte_t pte)
 53{
 54	*ptep = pte;
 55}
 56
 57static inline void native_set_pte_atomic(pte_t *ptep, pte_t pte)
 58{
 59	native_set_pte(ptep, pte);
 60}
 61
 62static inline void native_set_pmd(pmd_t *pmdp, pmd_t pmd)
 63{
 64	*pmdp = pmd;
 65}
 66
 67static inline void native_pmd_clear(pmd_t *pmd)
 68{
 69	native_set_pmd(pmd, native_make_pmd(0));
 70}
 71
 72static inline pte_t native_ptep_get_and_clear(pte_t *xp)
 73{
 74#ifdef CONFIG_SMP
 75	return native_make_pte(xchg(&xp->pte, 0));
 76#else
 77	/* native_local_ptep_get_and_clear,
 78	   but duplicated because of cyclic dependency */
 79	pte_t ret = *xp;
 80	native_pte_clear(NULL, 0, xp);
 81	return ret;
 82#endif
 83}
 84
 85static inline pmd_t native_pmdp_get_and_clear(pmd_t *xp)
 86{
 87#ifdef CONFIG_SMP
 88	return native_make_pmd(xchg(&xp->pmd, 0));
 89#else
 90	/* native_local_pmdp_get_and_clear,
 91	   but duplicated because of cyclic dependency */
 92	pmd_t ret = *xp;
 93	native_pmd_clear(xp);
 94	return ret;
 95#endif
 96}
 97
 98static inline void native_set_pud(pud_t *pudp, pud_t pud)
 99{
100	*pudp = pud;
101}
102
103static inline void native_pud_clear(pud_t *pud)
104{
105	native_set_pud(pud, native_make_pud(0));
106}
107
108static inline void native_set_pgd(pgd_t *pgdp, pgd_t pgd)
109{
110	*pgdp = pgd;
111}
112
113static inline void native_pgd_clear(pgd_t *pgd)
114{
115	native_set_pgd(pgd, native_make_pgd(0));
116}
117
118extern void sync_global_pgds(unsigned long start, unsigned long end);
119
120/*
121 * Conversion functions: convert a page and protection to a page entry,
122 * and a page entry and page directory to the page they refer to.
123 */
124
125/*
126 * Level 4 access.
127 */
128static inline int pgd_large(pgd_t pgd) { return 0; }
129#define mk_kernel_pgd(address) __pgd((address) | _KERNPG_TABLE)
130
131/* PUD - Level3 access */
132
133/* PMD  - Level 2 access */
134#define pte_to_pgoff(pte) ((pte_val((pte)) & PHYSICAL_PAGE_MASK) >> PAGE_SHIFT)
135#define pgoff_to_pte(off) ((pte_t) { .pte = ((off) << PAGE_SHIFT) |	\
136					    _PAGE_FILE })
137#define PTE_FILE_MAX_BITS __PHYSICAL_MASK_SHIFT
138
139/* PTE - Level 1 access. */
140
141/* x86-64 always has all page tables mapped. */
142#define pte_offset_map(dir, address) pte_offset_kernel((dir), (address))
143#define pte_unmap(pte) ((void)(pte))/* NOP */
144
145#define update_mmu_cache(vma, address, ptep) do { } while (0)
146
147/* Encode and de-code a swap entry */
148#if _PAGE_BIT_FILE < _PAGE_BIT_PROTNONE
149#define SWP_TYPE_BITS (_PAGE_BIT_FILE - _PAGE_BIT_PRESENT - 1)
150#define SWP_OFFSET_SHIFT (_PAGE_BIT_PROTNONE + 1)
151#else
152#define SWP_TYPE_BITS (_PAGE_BIT_PROTNONE - _PAGE_BIT_PRESENT - 1)
153#define SWP_OFFSET_SHIFT (_PAGE_BIT_FILE + 1)
154#endif
155
156#define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS)
157
158#define __swp_type(x)			(((x).val >> (_PAGE_BIT_PRESENT + 1)) \
159					 & ((1U << SWP_TYPE_BITS) - 1))
160#define __swp_offset(x)			((x).val >> SWP_OFFSET_SHIFT)
161#define __swp_entry(type, offset)	((swp_entry_t) { \
162					 ((type) << (_PAGE_BIT_PRESENT + 1)) \
163					 | ((offset) << SWP_OFFSET_SHIFT) })
164#define __pte_to_swp_entry(pte)		((swp_entry_t) { pte_val((pte)) })
165#define __swp_entry_to_pte(x)		((pte_t) { .pte = (x).val })
166
167extern int kern_addr_valid(unsigned long addr);
168extern void cleanup_highmap(void);
169
170#define HAVE_ARCH_UNMAPPED_AREA
171#define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
172
173#define pgtable_cache_init()   do { } while (0)
174#define check_pgt_cache()      do { } while (0)
175
176#define PAGE_AGP    PAGE_KERNEL_NOCACHE
177#define HAVE_PAGE_AGP 1
178
179/* fs/proc/kcore.c */
180#define	kc_vaddr_to_offset(v) ((v) & __VIRTUAL_MASK)
181#define	kc_offset_to_vaddr(o) ((o) | ~__VIRTUAL_MASK)
182
183#define __HAVE_ARCH_PTE_SAME
184
185#endif /* !__ASSEMBLY__ */
186
187#endif /* _ASM_X86_PGTABLE_64_H */