include/asm-generic/pgtable-nopud.h

0001 /* SPDX-License-Identifier: GPL-2.0 */
0002 #ifndef _PGTABLE_NOPUD_H
0003 #define _PGTABLE_NOPUD_H
0004
0005 #ifndef __ASSEMBLY__
0006
0007 #include <asm-generic/pgtable-nop4d.h>
0008
0009 #define __PAGETABLE_PUD_FOLDED 1
0010
0011 /*
0012  * Having the pud type consist of a p4d gets the size right, and allows
0013  * us to conceptually access the p4d entry that this pud is folded into
0014  * without casting.
0015  */
0016 typedef struct { p4d_t p4d; } pud_t;
0017
0018 #define PUD_SHIFT   P4D_SHIFT
0019 #define PTRS_PER_PUD    1
0020 #define PUD_SIZE    (1UL << PUD_SHIFT)
0021 #define PUD_MASK    (~(PUD_SIZE-1))
0022
0023 /*
0024  * The "p4d_xxx()" functions here are trivial for a folded two-level
0025  * setup: the pud is never bad, and a pud always exists (as it's folded
0026  * into the p4d entry)
0027  */
0028 static inline int p4d_none(p4d_t p4d)       { return 0; }
0029 static inline int p4d_bad(p4d_t p4d)        { return 0; }
0030 static inline int p4d_present(p4d_t p4d)    { return 1; }
0031 static inline void p4d_clear(p4d_t *p4d)    { }
0032 #define pud_ERROR(pud)              (p4d_ERROR((pud).p4d))
0033
0034 #define p4d_populate(mm, p4d, pud)      do { } while (0)
0035 #define p4d_populate_safe(mm, p4d, pud)     do { } while (0)
0036 /*
0037  * (puds are folded into p4ds so this doesn't get actually called,
0038  * but the define is needed for a generic inline function.)
0039  */
0040 #define set_p4d(p4dptr, p4dval) set_pud((pud_t *)(p4dptr), (pud_t) { p4dval })
0041
0042 static inline pud_t *pud_offset(p4d_t *p4d, unsigned long address)
0043 {
0044     return (pud_t *)p4d;
0045 }
0046 #define pud_offset pud_offset
0047
0048 #define pud_val(x)              (p4d_val((x).p4d))
0049 #define __pud(x)                ((pud_t) { __p4d(x) })
0050
0051 #define p4d_page(p4d)               (pud_page((pud_t){ p4d }))
0052 #define p4d_pgtable(p4d)            ((pud_t *)(pud_pgtable((pud_t){ p4d })))
0053
0054 /*
0055  * allocating and freeing a pud is trivial: the 1-entry pud is
0056  * inside the p4d, so has no extra memory associated with it.
0057  */
0058 #define pud_alloc_one(mm, address)      NULL
0059 #define pud_free(mm, x)             do { } while (0)
0060 #define pud_free_tlb(tlb, x, a)             do { } while (0)
0061
0062 #undef  pud_addr_end
0063 #define pud_addr_end(addr, end)         (end)
0064
0065 #endif /* __ASSEMBLY__ */
0066 #endif /* _PGTABLE_NOPUD_H */