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1/* SPDX-License-Identifier: GPL-2.0 */2#ifndef _PGTABLE_NOPUD_H3#define _PGTABLE_NOPUD_H4 5#ifndef __ASSEMBLY__6 7#include <asm-generic/pgtable-nop4d.h>8 9#define __PAGETABLE_PUD_FOLDED 110 11/*12 * Having the pud type consist of a p4d gets the size right, and allows13 * us to conceptually access the p4d entry that this pud is folded into14 * without casting.15 */16typedef struct { p4d_t p4d; } pud_t;17 18#define PUD_SHIFT P4D_SHIFT19#define PTRS_PER_PUD 120#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-level25 * setup: the pud is never bad, and a pud always exists (as it's folded26 * 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_offset47 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 is56 * inside the p4d, so has no extra memory associated with it.57 */58#define pud_alloc_one(mm, address) NULL59#define pud_free(mm, x) do { } while (0)60#define pud_free_tlb(tlb, x, a) do { } while (0)61 62#undef pud_addr_end63#define pud_addr_end(addr, end) (end)64 65#endif /* __ASSEMBLY__ */66#endif /* _PGTABLE_NOPUD_H */67