cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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hugetlb.h (3216B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2/*
      3 *  IBM System z Huge TLB Page Support for Kernel.
      4 *
      5 *    Copyright IBM Corp. 2008
      6 *    Author(s): Gerald Schaefer <gerald.schaefer@de.ibm.com>
      7 */
      8
      9#ifndef _ASM_S390_HUGETLB_H
     10#define _ASM_S390_HUGETLB_H
     11
     12#include <linux/pgtable.h>
     13#include <asm/page.h>
     14
     15#define hugetlb_free_pgd_range			free_pgd_range
     16#define hugepages_supported()			(MACHINE_HAS_EDAT1)
     17
     18void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
     19		     pte_t *ptep, pte_t pte);
     20pte_t huge_ptep_get(pte_t *ptep);
     21pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
     22			      unsigned long addr, pte_t *ptep);
     23
     24/*
     25 * If the arch doesn't supply something else, assume that hugepage
     26 * size aligned regions are ok without further preparation.
     27 */
     28static inline int prepare_hugepage_range(struct file *file,
     29			unsigned long addr, unsigned long len)
     30{
     31	if (len & ~HPAGE_MASK)
     32		return -EINVAL;
     33	if (addr & ~HPAGE_MASK)
     34		return -EINVAL;
     35	return 0;
     36}
     37
     38static inline void arch_clear_hugepage_flags(struct page *page)
     39{
     40	clear_bit(PG_arch_1, &page->flags);
     41}
     42#define arch_clear_hugepage_flags arch_clear_hugepage_flags
     43
     44static inline void huge_pte_clear(struct mm_struct *mm, unsigned long addr,
     45				  pte_t *ptep, unsigned long sz)
     46{
     47	if ((pte_val(*ptep) & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R3)
     48		set_pte(ptep, __pte(_REGION3_ENTRY_EMPTY));
     49	else
     50		set_pte(ptep, __pte(_SEGMENT_ENTRY_EMPTY));
     51}
     52
     53static inline pte_t huge_ptep_clear_flush(struct vm_area_struct *vma,
     54					  unsigned long address, pte_t *ptep)
     55{
     56	return huge_ptep_get_and_clear(vma->vm_mm, address, ptep);
     57}
     58
     59static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
     60					     unsigned long addr, pte_t *ptep,
     61					     pte_t pte, int dirty)
     62{
     63	int changed = !pte_same(huge_ptep_get(ptep), pte);
     64	if (changed) {
     65		huge_ptep_get_and_clear(vma->vm_mm, addr, ptep);
     66		set_huge_pte_at(vma->vm_mm, addr, ptep, pte);
     67	}
     68	return changed;
     69}
     70
     71static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
     72					   unsigned long addr, pte_t *ptep)
     73{
     74	pte_t pte = huge_ptep_get_and_clear(mm, addr, ptep);
     75	set_huge_pte_at(mm, addr, ptep, pte_wrprotect(pte));
     76}
     77
     78static inline pte_t mk_huge_pte(struct page *page, pgprot_t pgprot)
     79{
     80	return mk_pte(page, pgprot);
     81}
     82
     83static inline int huge_pte_none(pte_t pte)
     84{
     85	return pte_none(pte);
     86}
     87
     88static inline int huge_pte_none_mostly(pte_t pte)
     89{
     90	return huge_pte_none(pte);
     91}
     92
     93static inline int huge_pte_write(pte_t pte)
     94{
     95	return pte_write(pte);
     96}
     97
     98static inline int huge_pte_dirty(pte_t pte)
     99{
    100	return pte_dirty(pte);
    101}
    102
    103static inline pte_t huge_pte_mkwrite(pte_t pte)
    104{
    105	return pte_mkwrite(pte);
    106}
    107
    108static inline pte_t huge_pte_mkdirty(pte_t pte)
    109{
    110	return pte_mkdirty(pte);
    111}
    112
    113static inline pte_t huge_pte_wrprotect(pte_t pte)
    114{
    115	return pte_wrprotect(pte);
    116}
    117
    118static inline pte_t huge_pte_modify(pte_t pte, pgprot_t newprot)
    119{
    120	return pte_modify(pte, newprot);
    121}
    122
    123static inline pte_t huge_pte_mkuffd_wp(pte_t pte)
    124{
    125	return pte;
    126}
    127
    128static inline pte_t huge_pte_clear_uffd_wp(pte_t pte)
    129{
    130	return pte;
    131}
    132
    133static inline int huge_pte_uffd_wp(pte_t pte)
    134{
    135	return 0;
    136}
    137
    138static inline bool gigantic_page_runtime_supported(void)
    139{
    140	return true;
    141}
    142
    143#endif /* _ASM_S390_HUGETLB_H */