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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pgtable-nopud.h (1995B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2#ifndef _PGTABLE_NOPUD_H
      3#define _PGTABLE_NOPUD_H
      4
      5#ifndef __ASSEMBLY__
      6
      7#include <asm-generic/pgtable-nop4d.h>
      8
      9#define __PAGETABLE_PUD_FOLDED 1
     10
     11/*
     12 * Having the pud type consist of a p4d gets the size right, and allows
     13 * us to conceptually access the p4d entry that this pud is folded into
     14 * without casting.
     15 */
     16typedef struct { p4d_t p4d; } pud_t;
     17
     18#define PUD_SHIFT	P4D_SHIFT
     19#define PTRS_PER_PUD	1
     20#define PUD_SIZE  	(1UL << PUD_SHIFT)
     21#define PUD_MASK  	(~(PUD_SIZE-1))
     22
     23/*
     24 * The "p4d_xxx()" functions here are trivial for a folded two-level
     25 * setup: the pud is never bad, and a pud always exists (as it's folded
     26 * into the p4d entry)
     27 */
     28static inline int p4d_none(p4d_t p4d)		{ return 0; }
     29static inline int p4d_bad(p4d_t p4d)		{ return 0; }
     30static inline int p4d_present(p4d_t p4d)	{ return 1; }
     31static inline void p4d_clear(p4d_t *p4d)	{ }
     32#define pud_ERROR(pud)				(p4d_ERROR((pud).p4d))
     33
     34#define p4d_populate(mm, p4d, pud)		do { } while (0)
     35#define p4d_populate_safe(mm, p4d, pud)		do { } while (0)
     36/*
     37 * (puds are folded into p4ds so this doesn't get actually called,
     38 * but the define is needed for a generic inline function.)
     39 */
     40#define set_p4d(p4dptr, p4dval)	set_pud((pud_t *)(p4dptr), (pud_t) { p4dval })
     41
     42static inline pud_t *pud_offset(p4d_t *p4d, unsigned long address)
     43{
     44	return (pud_t *)p4d;
     45}
     46#define pud_offset pud_offset
     47
     48#define pud_val(x)				(p4d_val((x).p4d))
     49#define __pud(x)				((pud_t) { __p4d(x) })
     50
     51#define p4d_page(p4d)				(pud_page((pud_t){ p4d }))
     52#define p4d_pgtable(p4d)			((pud_t *)(pud_pgtable((pud_t){ p4d })))
     53
     54/*
     55 * allocating and freeing a pud is trivial: the 1-entry pud is
     56 * inside the p4d, so has no extra memory associated with it.
     57 */
     58#define pud_alloc_one(mm, address)		NULL
     59#define pud_free(mm, x)				do { } while (0)
     60#define pud_free_tlb(tlb, x, a)		        do { } while (0)
     61
     62#undef  pud_addr_end
     63#define pud_addr_end(addr, end)			(end)
     64
     65#endif /* __ASSEMBLY__ */
     66#endif /* _PGTABLE_NOPUD_H */