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

pgtable-nopmd.h (2086B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2#ifndef _PGTABLE_NOPMD_H
      3#define _PGTABLE_NOPMD_H
      4
      5#ifndef __ASSEMBLY__
      6
      7#include <asm-generic/pgtable-nopud.h>
      8
      9struct mm_struct;
     10
     11#define __PAGETABLE_PMD_FOLDED 1
     12
     13/*
     14 * Having the pmd type consist of a pud gets the size right, and allows
     15 * us to conceptually access the pud entry that this pmd is folded into
     16 * without casting.
     17 */
     18typedef struct { pud_t pud; } pmd_t;
     19
     20#define PMD_SHIFT	PUD_SHIFT
     21#define PTRS_PER_PMD	1
     22#define PMD_SIZE  	(1UL << PMD_SHIFT)
     23#define PMD_MASK  	(~(PMD_SIZE-1))
     24
     25/*
     26 * The "pud_xxx()" functions here are trivial for a folded two-level
     27 * setup: the pmd is never bad, and a pmd always exists (as it's folded
     28 * into the pud entry)
     29 */
     30static inline int pud_none(pud_t pud)		{ return 0; }
     31static inline int pud_bad(pud_t pud)		{ return 0; }
     32static inline int pud_present(pud_t pud)	{ return 1; }
     33static inline int pud_user(pud_t pud)		{ return 0; }
     34static inline int pud_leaf(pud_t pud)		{ return 0; }
     35static inline void pud_clear(pud_t *pud)	{ }
     36#define pmd_ERROR(pmd)				(pud_ERROR((pmd).pud))
     37
     38#define pud_populate(mm, pmd, pte)		do { } while (0)
     39
     40/*
     41 * (pmds are folded into puds so this doesn't get actually called,
     42 * but the define is needed for a generic inline function.)
     43 */
     44#define set_pud(pudptr, pudval)			set_pmd((pmd_t *)(pudptr), (pmd_t) { pudval })
     45
     46static inline pmd_t * pmd_offset(pud_t * pud, unsigned long address)
     47{
     48	return (pmd_t *)pud;
     49}
     50#define pmd_offset pmd_offset
     51
     52#define pmd_val(x)				(pud_val((x).pud))
     53#define __pmd(x)				((pmd_t) { __pud(x) } )
     54
     55#define pud_page(pud)				(pmd_page((pmd_t){ pud }))
     56#define pud_pgtable(pud)			((pmd_t *)(pmd_page_vaddr((pmd_t){ pud })))
     57
     58/*
     59 * allocating and freeing a pmd is trivial: the 1-entry pmd is
     60 * inside the pud, so has no extra memory associated with it.
     61 */
     62#define pmd_alloc_one(mm, address)		NULL
     63static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
     64{
     65}
     66#define pmd_free_tlb(tlb, x, a)		do { } while (0)
     67
     68#undef  pmd_addr_end
     69#define pmd_addr_end(addr, end)			(end)
     70
     71#endif /* __ASSEMBLY__ */
     72
     73#endif /* _PGTABLE_NOPMD_H */