1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _PGTABLE_NOPUD_H 3 #define _PGTABLE_NOPUD_H 4 5 #ifndef __ASSEMBLY__ 6 7 #ifdef __ARCH_USE_5LEVEL_HACK 8 #include <asm-generic/pgtable-nop4d-hack.h> 9 #else 10 #include <asm-generic/pgtable-nop4d.h> 11 12 #define __PAGETABLE_PUD_FOLDED 1 13 14 /* 15 * Having the pud type consist of a p4d gets the size right, and allows 16 * us to conceptually access the p4d entry that this pud is folded into 17 * without casting. 18 */ 19 typedef struct { p4d_t p4d; } pud_t; 20 21 #define PUD_SHIFT P4D_SHIFT 22 #define PTRS_PER_PUD 1 23 #define PUD_SIZE (1UL << PUD_SHIFT) 24 #define PUD_MASK (~(PUD_SIZE-1)) 25 26 /* 27 * The "p4d_xxx()" functions here are trivial for a folded two-level 28 * setup: the pud is never bad, and a pud always exists (as it's folded 29 * into the p4d entry) 30 */ 31 static inline int p4d_none(p4d_t p4d) { return 0; } 32 static inline int p4d_bad(p4d_t p4d) { return 0; } 33 static inline int p4d_present(p4d_t p4d) { return 1; } 34 static inline void p4d_clear(p4d_t *p4d) { } 35 #define pud_ERROR(pud) (p4d_ERROR((pud).p4d)) 36 37 #define p4d_populate(mm, p4d, pud) do { } while (0) 38 #define p4d_populate_safe(mm, p4d, pud) do { } while (0) 39 /* 40 * (puds are folded into p4ds so this doesn't get actually called, 41 * but the define is needed for a generic inline function.) 42 */ 43 #define set_p4d(p4dptr, p4dval) set_pud((pud_t *)(p4dptr), (pud_t) { p4dval }) 44 45 static inline pud_t *pud_offset(p4d_t *p4d, unsigned long address) 46 { 47 return (pud_t *)p4d; 48 } 49 50 #define pud_val(x) (p4d_val((x).p4d)) 51 #define __pud(x) ((pud_t) { __p4d(x) }) 52 53 #define p4d_page(p4d) (pud_page((pud_t){ p4d })) 54 #define p4d_page_vaddr(p4d) (pud_page_vaddr((pud_t){ p4d })) 55 56 /* 57 * allocating and freeing a pud is trivial: the 1-entry pud is 58 * inside the p4d, so has no extra memory associated with it. 59 */ 60 #define pud_alloc_one(mm, address) NULL 61 #define pud_free(mm, x) do { } while (0) 62 #define pud_free_tlb(tlb, x, a) do { } while (0) 63 64 #undef pud_addr_end 65 #define pud_addr_end(addr, end) (end) 66 67 #endif /* __ASSEMBLY__ */ 68 #endif /* !__ARCH_USE_5LEVEL_HACK */ 69 #endif /* _PGTABLE_NOPUD_H */ 70