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

hugetlb.h (2199B)

      1/*
      2 * This file is subject to the terms and conditions of the GNU General Public
      3 * License.  See the file "COPYING" in the main directory of this archive
      4 * for more details.
      5 *
      6 * Copyright (C) 2008, 2009 Cavium Networks, Inc.
      7 */
      8
      9#ifndef __ASM_HUGETLB_H
     10#define __ASM_HUGETLB_H
     11
     12#include <asm/page.h>
     13
     14#define __HAVE_ARCH_PREPARE_HUGEPAGE_RANGE
     15static inline int prepare_hugepage_range(struct file *file,
     16					 unsigned long addr,
     17					 unsigned long len)
     18{
     19	unsigned long task_size = STACK_TOP;
     20	struct hstate *h = hstate_file(file);
     21
     22	if (len & ~huge_page_mask(h))
     23		return -EINVAL;
     24	if (addr & ~huge_page_mask(h))
     25		return -EINVAL;
     26	if (len > task_size)
     27		return -ENOMEM;
     28	if (task_size - len < addr)
     29		return -EINVAL;
     30	return 0;
     31}
     32
     33#define __HAVE_ARCH_HUGE_PTEP_GET_AND_CLEAR
     34static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
     35					    unsigned long addr, pte_t *ptep)
     36{
     37	pte_t clear;
     38	pte_t pte = *ptep;
     39
     40	pte_val(clear) = (unsigned long)invalid_pte_table;
     41	set_pte_at(mm, addr, ptep, clear);
     42	return pte;
     43}
     44
     45#define __HAVE_ARCH_HUGE_PTEP_CLEAR_FLUSH
     46static inline pte_t huge_ptep_clear_flush(struct vm_area_struct *vma,
     47					  unsigned long addr, pte_t *ptep)
     48{
     49	pte_t pte;
     50
     51	/*
     52	 * clear the huge pte entry firstly, so that the other smp threads will
     53	 * not get old pte entry after finishing flush_tlb_page and before
     54	 * setting new huge pte entry
     55	 */
     56	pte = huge_ptep_get_and_clear(vma->vm_mm, addr, ptep);
     57	flush_tlb_page(vma, addr);
     58	return pte;
     59}
     60
     61#define __HAVE_ARCH_HUGE_PTE_NONE
     62static inline int huge_pte_none(pte_t pte)
     63{
     64	unsigned long val = pte_val(pte) & ~_PAGE_GLOBAL;
     65	return !val || (val == (unsigned long)invalid_pte_table);
     66}
     67
     68#define __HAVE_ARCH_HUGE_PTEP_SET_ACCESS_FLAGS
     69static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
     70					     unsigned long addr,
     71					     pte_t *ptep, pte_t pte,
     72					     int dirty)
     73{
     74	int changed = !pte_same(*ptep, pte);
     75
     76	if (changed) {
     77		set_pte_at(vma->vm_mm, addr, ptep, pte);
     78		/*
     79		 * There could be some standard sized pages in there,
     80		 * get them all.
     81		 */
     82		flush_tlb_range(vma, addr, addr + HPAGE_SIZE);
     83	}
     84	return changed;
     85}
     86
     87#include <asm-generic/hugetlb.h>
     88
     89#endif /* __ASM_HUGETLB_H */