Viewing file:  pgtable-nop4d-hack.h (1.92 KB) -rw-r--r--
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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _PGTABLE_NOP4D_HACK_H
#define _PGTABLE_NOP4D_HACK_H
#ifndef __ASSEMBLY__
#include <asm-generic/5level-fixup.h>
#define __PAGETABLE_PUD_FOLDED 1
/*
* Having the pud type consist of a pgd gets the size right, and allows
* us to conceptually access the pgd entry that this pud is folded into
* without casting.
*/
typedef struct { pgd_t pgd; } pud_t;
#define PUD_SHIFT PGDIR_SHIFT
#define PTRS_PER_PUD 1
#define PUD_SIZE (1UL << PUD_SHIFT)
#define PUD_MASK (~(PUD_SIZE-1))
/*
* The "pgd_xxx()" functions here are trivial for a folded two-level
* setup: the pud is never bad, and a pud always exists (as it's folded
* into the pgd entry)
*/
static inline int pgd_none(pgd_t pgd) { return 0; }
static inline int pgd_bad(pgd_t pgd) { return 0; }
static inline int pgd_present(pgd_t pgd) { return 1; }
static inline void pgd_clear(pgd_t *pgd) { }
#define pud_ERROR(pud) (pgd_ERROR((pud).pgd))
#define pgd_populate(mm, pgd, pud) do { } while (0)
#define pgd_populate_safe(mm, pgd, pud) do { } while (0)
/*
* (puds are folded into pgds so this doesn't get actually called,
* but the define is needed for a generic inline function.)
*/
#define set_pgd(pgdptr, pgdval) set_pud((pud_t *)(pgdptr), (pud_t) { pgdval })
static inline pud_t *pud_offset(pgd_t *pgd, unsigned long address)
{
return (pud_t *)pgd;
}
#define pud_val(x) (pgd_val((x).pgd))
#define __pud(x) ((pud_t) { __pgd(x) })
#define pgd_page(pgd) (pud_page((pud_t){ pgd }))
#define pgd_page_vaddr(pgd) (pud_page_vaddr((pud_t){ pgd }))
/*
* allocating and freeing a pud is trivial: the 1-entry pud is
* inside the pgd, so has no extra memory associated with it.
*/
#define pud_alloc_one(mm, address) NULL
#define pud_free(mm, x) do { } while (0)
#define __pud_free_tlb(tlb, x, a) do { } while (0)
#undef pud_addr_end
#define pud_addr_end(addr, end) (end)
#endif /* __ASSEMBLY__ */
#endif /* _PGTABLE_NOP4D_HACK_H */
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