pgtable.h (ca5999fde0a1761665a38e4c9a72dbcd7d190a81) pgtable.h (974b9b2c68f3d35a65e80af9657fe378d2439b60)
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _ALPHA_PGTABLE_H
3#define _ALPHA_PGTABLE_H
4
5#include <asm-generic/pgtable-nopud.h>
6
7/*
8 * This file contains the functions and defines necessary to modify and use

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271
272extern inline pte_t pte_wrprotect(pte_t pte) { pte_val(pte) |= _PAGE_FOW; return pte; }
273extern inline pte_t pte_mkclean(pte_t pte) { pte_val(pte) &= ~(__DIRTY_BITS); return pte; }
274extern inline pte_t pte_mkold(pte_t pte) { pte_val(pte) &= ~(__ACCESS_BITS); return pte; }
275extern inline pte_t pte_mkwrite(pte_t pte) { pte_val(pte) &= ~_PAGE_FOW; return pte; }
276extern inline pte_t pte_mkdirty(pte_t pte) { pte_val(pte) |= __DIRTY_BITS; return pte; }
277extern inline pte_t pte_mkyoung(pte_t pte) { pte_val(pte) |= __ACCESS_BITS; return pte; }
278
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _ALPHA_PGTABLE_H
3#define _ALPHA_PGTABLE_H
4
5#include <asm-generic/pgtable-nopud.h>
6
7/*
8 * This file contains the functions and defines necessary to modify and use

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271
272extern inline pte_t pte_wrprotect(pte_t pte) { pte_val(pte) |= _PAGE_FOW; return pte; }
273extern inline pte_t pte_mkclean(pte_t pte) { pte_val(pte) &= ~(__DIRTY_BITS); return pte; }
274extern inline pte_t pte_mkold(pte_t pte) { pte_val(pte) &= ~(__ACCESS_BITS); return pte; }
275extern inline pte_t pte_mkwrite(pte_t pte) { pte_val(pte) &= ~_PAGE_FOW; return pte; }
276extern inline pte_t pte_mkdirty(pte_t pte) { pte_val(pte) |= __DIRTY_BITS; return pte; }
277extern inline pte_t pte_mkyoung(pte_t pte) { pte_val(pte) |= __ACCESS_BITS; return pte; }
278
279#define PAGE_DIR_OFFSET(tsk,address) pgd_offset((tsk),(address))
280
281/* to find an entry in a kernel page-table-directory */
282#define pgd_offset_k(address) pgd_offset(&init_mm, (address))
283
284/* to find an entry in a page-table-directory. */
285#define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
286#define pgd_offset(mm, address) ((mm)->pgd+pgd_index(address))
287
288/*
289 * The smp_read_barrier_depends() in the following functions are required to
290 * order the load of *dir (the pointer in the top level page table) with any
291 * subsequent load of the returned pmd_t *ret (ret is data dependent on *dir).
292 *
293 * If this ordering is not enforced, the CPU might load an older value of
294 * *ret, which may be uninitialized data. See mm/memory.c:__pte_alloc for
295 * more details.

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300
301/* Find an entry in the second-level page table.. */
302extern inline pmd_t * pmd_offset(pud_t * dir, unsigned long address)
303{
304 pmd_t *ret = (pmd_t *) pud_page_vaddr(*dir) + ((address >> PMD_SHIFT) & (PTRS_PER_PAGE - 1));
305 smp_read_barrier_depends(); /* see above */
306 return ret;
307}
279/*
280 * The smp_read_barrier_depends() in the following functions are required to
281 * order the load of *dir (the pointer in the top level page table) with any
282 * subsequent load of the returned pmd_t *ret (ret is data dependent on *dir).
283 *
284 * If this ordering is not enforced, the CPU might load an older value of
285 * *ret, which may be uninitialized data. See mm/memory.c:__pte_alloc for
286 * more details.

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291
292/* Find an entry in the second-level page table.. */
293extern inline pmd_t * pmd_offset(pud_t * dir, unsigned long address)
294{
295 pmd_t *ret = (pmd_t *) pud_page_vaddr(*dir) + ((address >> PMD_SHIFT) & (PTRS_PER_PAGE - 1));
296 smp_read_barrier_depends(); /* see above */
297 return ret;
298}
299#define pmd_offset pmd_offset
308
309/* Find an entry in the third-level page table.. */
310extern inline pte_t * pte_offset_kernel(pmd_t * dir, unsigned long address)
311{
312 pte_t *ret = (pte_t *) pmd_page_vaddr(*dir)
313 + ((address >> PAGE_SHIFT) & (PTRS_PER_PAGE - 1));
314 smp_read_barrier_depends(); /* see above */
315 return ret;
316}
300
301/* Find an entry in the third-level page table.. */
302extern inline pte_t * pte_offset_kernel(pmd_t * dir, unsigned long address)
303{
304 pte_t *ret = (pte_t *) pmd_page_vaddr(*dir)
305 + ((address >> PAGE_SHIFT) & (PTRS_PER_PAGE - 1));
306 smp_read_barrier_depends(); /* see above */
307 return ret;
308}
309#define pte_offset_kernel pte_offset_kernel
317
310
318#define pte_offset_map(dir,addr) pte_offset_kernel((dir),(addr))
319#define pte_unmap(pte) do { } while (0)
320
321extern pgd_t swapper_pg_dir[1024];
322
323/*
324 * The Alpha doesn't have any external MMU info: the kernel page
325 * tables contain all the necessary information.
326 */
327extern inline void update_mmu_cache(struct vm_area_struct * vma,
328 unsigned long address, pte_t *ptep)

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312
313/*
314 * The Alpha doesn't have any external MMU info: the kernel page
315 * tables contain all the necessary information.
316 */
317extern inline void update_mmu_cache(struct vm_area_struct * vma,
318 unsigned long address, pte_t *ptep)

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