1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 *  arch/arm/include/asm/pgtable-nommu.h
4 *
5 *  Copyright (C) 1995-2002 Russell King
6 *  Copyright (C) 2004  Hyok S. Choi
7 */
8#ifndef _ASMARM_PGTABLE_NOMMU_H
9#define _ASMARM_PGTABLE_NOMMU_H
10
11#ifndef __ASSEMBLY__
12
13#include <linux/slab.h>
14#include <asm/processor.h>
15#include <asm/page.h>
16
17/*
18 * Trivial page table functions.
19 */
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/* FIXME */
26/*
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
29 */
30#define PGDIR_SHIFT		21
31
32#define PGDIR_SIZE		(1UL << PGDIR_SHIFT)
33#define PGDIR_MASK		(~(PGDIR_SIZE-1))
34/* FIXME */
35
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)
41
42#define swapper_pg_dir ((pgd_t *) 0)
43
44
45typedef pte_t *pte_addr_t;
46
47/*
48 * Mark the prot value as uncacheable and unbufferable.
49 */
50#define pgprot_noncached(prot)	(prot)
51#define pgprot_writecombine(prot) (prot)
52#define pgprot_device(prot)	(prot)
53
54
55/*
56 * These would be in other places but having them here reduces the diffs.
57 */
58extern unsigned int kobjsize(const void *objp);
59
60/*
61 * All 32bit addresses are effectively valid for vmalloc...
62 * Sort of meaningless for non-VM targets.
63 */
64#define	VMALLOC_START	0UL
65#define	VMALLOC_END	0xffffffffUL
66
67#define FIRST_USER_ADDRESS      0UL
68
69#else
70
71/*
72 * dummy tlb and user structures.
73 */
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)
80
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)
88
89#endif /*__ASSEMBLY__*/
90
91#endif /* _ASMARM_PGTABLE_H */
92