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)
27 * PMD_SHIFT determines the size of the area a second-level page table can map
28 * PGDIR_SHIFT determines what a third-level page table entry can map
30 #define PGDIR_SHIFT 21
32 #define PGDIR_SIZE (1UL << PGDIR_SHIFT)
33 #define PGDIR_MASK (~(PGDIR_SIZE-1))
36 #define PAGE_NONE __pgprot(0)
37 #define PAGE_SHARED __pgprot(0)
38 #define PAGE_COPY __pgprot(0)
39 #define PAGE_READONLY __pgprot(0)
40 #define PAGE_KERNEL __pgprot(0)
42 #define swapper_pg_dir ((pgd_t *) 0)
45 typedef pte_t *pte_addr_t;
48 * Mark the prot value as uncacheable and unbufferable.
50 #define pgprot_noncached(prot) (prot)
51 #define pgprot_writecombine(prot) (prot)
52 #define pgprot_device(prot) (prot)
56 * These would be in other places but having them here reduces the diffs.
58 extern unsigned int kobjsize(const void *objp);
61 * All 32bit addresses are effectively valid for vmalloc...
62 * Sort of meaningless for non-VM targets.
64 #define VMALLOC_START 0UL
65 #define VMALLOC_END 0xffffffffUL
67 #define FIRST_USER_ADDRESS 0UL
72 * dummy tlb and user structures.
74 #define v3_tlb_fns (0)
75 #define v4_tlb_fns (0)
76 #define v4wb_tlb_fns (0)
77 #define v4wbi_tlb_fns (0)
78 #define v6wbi_tlb_fns (0)
79 #define v7wbi_tlb_fns (0)
81 #define v3_user_fns (0)
82 #define v4_user_fns (0)
83 #define v4_mc_user_fns (0)
84 #define v4wb_user_fns (0)
85 #define v4wt_user_fns (0)
86 #define v6_user_fns (0)
87 #define xscale_mc_user_fns (0)
89 #endif /*__ASSEMBLY__*/
91 #endif /* _ASMARM_PGTABLE_H */