cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

pgalloc.h (1405B)

      1/* SPDX-License-Identifier: GPL-2.0-only */
      2/*
      3 * include/asm-xtensa/pgalloc.h
      4 *
      5 * Copyright (C) 2001-2007 Tensilica Inc.
      6 */
      7
      8#ifndef _XTENSA_PGALLOC_H
      9#define _XTENSA_PGALLOC_H
     10
     11#ifdef CONFIG_MMU
     12#include <linux/highmem.h>
     13#include <linux/slab.h>
     14
     15#define __HAVE_ARCH_PTE_ALLOC_ONE_KERNEL
     16#define __HAVE_ARCH_PTE_ALLOC_ONE
     17#include <asm-generic/pgalloc.h>
     18
     19/*
     20 * Allocating and freeing a pmd is trivial: the 1-entry pmd is
     21 * inside the pgd, so has no extra memory associated with it.
     22 */
     23
     24#define pmd_populate_kernel(mm, pmdp, ptep)				     \
     25	(pmd_val(*(pmdp)) = ((unsigned long)ptep))
     26#define pmd_populate(mm, pmdp, page)					     \
     27	(pmd_val(*(pmdp)) = ((unsigned long)page_to_virt(page)))
     28
     29static inline pgd_t*
     30pgd_alloc(struct mm_struct *mm)
     31{
     32	return (pgd_t*) __get_free_pages(GFP_KERNEL | __GFP_ZERO, PGD_ORDER);
     33}
     34
     35static inline void ptes_clear(pte_t *ptep)
     36{
     37	int i;
     38
     39	for (i = 0; i < PTRS_PER_PTE; i++)
     40		pte_clear(NULL, 0, ptep + i);
     41}
     42
     43static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm)
     44{
     45	pte_t *ptep;
     46
     47	ptep = (pte_t *)__pte_alloc_one_kernel(mm);
     48	if (!ptep)
     49		return NULL;
     50	ptes_clear(ptep);
     51	return ptep;
     52}
     53
     54static inline pgtable_t pte_alloc_one(struct mm_struct *mm)
     55{
     56	struct page *page;
     57
     58	page = __pte_alloc_one(mm, GFP_PGTABLE_USER);
     59	if (!page)
     60		return NULL;
     61	ptes_clear(page_address(page));
     62	return page;
     63}
     64
     65#endif /* CONFIG_MMU */
     66
     67#endif /* _XTENSA_PGALLOC_H */