1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * arch/arm/include/asm/pgtable-nommu.h
5 * Copyright (C) 1995-2002 Russell King
6 * Copyright (C) 2004 Hyok S. Choi
8 #ifndef _ASMARM_PGTABLE_NOMMU_H
9 #define _ASMARM_PGTABLE_NOMMU_H
13 #include <linux/slab.h>
14 #include <asm/processor.h>
18 * Trivial page table functions.
20 #define pgd_present(pgd) (1)
21 #define pgd_none(pgd) (0)
22 #define pgd_bad(pgd) (0)
23 #define pgd_clear(pgdp)
24 #define kern_addr_valid(addr) (1)
25 #define pmd_offset(a, b) ((void *)0)
28 * PMD_SHIFT determines the size of the area a second-level page table can map
29 * PGDIR_SHIFT determines what a third-level page table entry can map
31 #define PGDIR_SHIFT 21
33 #define PGDIR_SIZE (1UL << PGDIR_SHIFT)
34 #define PGDIR_MASK (~(PGDIR_SIZE-1))
37 #define PAGE_NONE __pgprot(0)
38 #define PAGE_SHARED __pgprot(0)
39 #define PAGE_COPY __pgprot(0)
40 #define PAGE_READONLY __pgprot(0)
41 #define PAGE_KERNEL __pgprot(0)
43 #define swapper_pg_dir ((pgd_t *) 0)
45 #define __swp_type(x) (0)
46 #define __swp_offset(x) (0)
47 #define __swp_entry(typ,off) ((swp_entry_t) { ((typ) | ((off) << 7)) })
48 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
49 #define __swp_entry_to_pte(x) ((pte_t) { (x).val })
52 typedef pte_t *pte_addr_t;
55 * ZERO_PAGE is a global shared page that is always zero: used
56 * for zero-mapped memory areas etc..
58 #define ZERO_PAGE(vaddr) (virt_to_page(0))
61 * Mark the prot value as uncacheable and unbufferable.
63 #define pgprot_noncached(prot) (prot)
64 #define pgprot_writecombine(prot) (prot)
65 #define pgprot_dmacoherent(prot) (prot)
66 #define pgprot_device(prot) (prot)
70 * These would be in other places but having them here reduces the diffs.
72 extern unsigned int kobjsize(const void *objp);
75 * No page table caches to initialise.
77 #define pgtable_cache_init() do { } while (0)
80 * All 32bit addresses are effectively valid for vmalloc...
81 * Sort of meaningless for non-VM targets.
83 #define VMALLOC_START 0UL
84 #define VMALLOC_END 0xffffffffUL
86 #define FIRST_USER_ADDRESS 0UL
88 #include <asm-generic/pgtable.h>
93 * dummy tlb and user structures.
95 #define v3_tlb_fns (0)
96 #define v4_tlb_fns (0)
97 #define v4wb_tlb_fns (0)
98 #define v4wbi_tlb_fns (0)
99 #define v6wbi_tlb_fns (0)
100 #define v7wbi_tlb_fns (0)
102 #define v3_user_fns (0)
103 #define v4_user_fns (0)
104 #define v4_mc_user_fns (0)
105 #define v4wb_user_fns (0)
106 #define v4wt_user_fns (0)
107 #define v6_user_fns (0)
108 #define xscale_mc_user_fns (0)
110 #endif /*__ASSEMBLY__*/
112 #endif /* _ASMARM_PGTABLE_H */