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 */ 16 typedef 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 */ 28 static inline int p4d_none(p4d_t p4d) { return 0; } 29 static inline int p4d_bad(p4d_t p4d) { return 0; } 30 static inline int p4d_present(p4d_t p4d) { return 1; } 31 static 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 42 static 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_page_vaddr(p4d) (pud_page_vaddr((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 */ 67