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/*
25 * PMD_SHIFT determines the size of the area a second-level page table can map
26 * PGDIR_SHIFT determines what a third-level page table entry can map
27 */
28#define PGDIR_SHIFT		21
29
30#define PGDIR_SIZE		(1UL << PGDIR_SHIFT)
31#define PGDIR_MASK		(~(PGDIR_SIZE-1))
32/* FIXME */
33
34#define PAGE_NONE	__pgprot(0)
35#define PAGE_SHARED	__pgprot(0)
36#define PAGE_COPY	__pgprot(0)
37#define PAGE_READONLY	__pgprot(0)
38#define PAGE_KERNEL	__pgprot(0)
39
40#define swapper_pg_dir ((pgd_t *) 0)
41
 
 
 
 
 
 
42
43typedef pte_t *pte_addr_t;
44
45/*
 
 
 
 
 
 
46 * Mark the prot value as uncacheable and unbufferable.
47 */
48#define pgprot_noncached(prot)	(prot)
49#define pgprot_writecombine(prot) (prot)
50#define pgprot_device(prot)	(prot)
51
52
53/*
54 * These would be in other places but having them here reduces the diffs.
55 */
56extern unsigned int kobjsize(const void *objp);
57
58/*
 
 
 
 
 
59 * All 32bit addresses are effectively valid for vmalloc...
60 * Sort of meaningless for non-VM targets.
61 */
62#define	VMALLOC_START	0UL
63#define	VMALLOC_END	0xffffffffUL
64
65#define FIRST_USER_ADDRESS      0UL
 
 
66
67#else 
68
69/*
70 * dummy tlb and user structures.
71 */
72#define v3_tlb_fns	(0)
73#define v4_tlb_fns	(0)
74#define v4wb_tlb_fns	(0)
75#define v4wbi_tlb_fns	(0)
76#define v6wbi_tlb_fns	(0)
77#define v7wbi_tlb_fns	(0)
78
79#define v3_user_fns	(0)
80#define v4_user_fns	(0)
81#define v4_mc_user_fns	(0)
82#define v4wb_user_fns	(0)
83#define v4wt_user_fns	(0)
84#define v6_user_fns	(0)
85#define xscale_mc_user_fns (0)
86
87#endif /*__ASSEMBLY__*/
88
89#endif /* _ASMARM_PGTABLE_H */

 
  1/*
  2 *  arch/arm/include/asm/pgtable-nommu.h
  3 *
  4 *  Copyright (C) 1995-2002 Russell King
  5 *  Copyright (C) 2004  Hyok S. Choi
  6 *
  7 * This program is free software; you can redistribute it and/or modify
  8 * it under the terms of the GNU General Public License version 2 as
  9 * published by the Free Software Foundation.
 10 */
 11#ifndef _ASMARM_PGTABLE_NOMMU_H
 12#define _ASMARM_PGTABLE_NOMMU_H
 13
 14#ifndef __ASSEMBLY__
 15
 16#include <linux/slab.h>
 17#include <asm/processor.h>
 18#include <asm/page.h>
 19
 20/*
 21 * Trivial page table functions.
 22 */
 23#define pgd_present(pgd)	(1)
 24#define pgd_none(pgd)		(0)
 25#define pgd_bad(pgd)		(0)
 26#define pgd_clear(pgdp)
 27#define kern_addr_valid(addr)	(1)
 28#define	pmd_offset(a, b)	((void *)0)
 29/* FIXME */
 30/*
 31 * PMD_SHIFT determines the size of the area a second-level page table can map
 32 * PGDIR_SHIFT determines what a third-level page table entry can map
 33 */
 34#define PGDIR_SHIFT		21
 35
 36#define PGDIR_SIZE		(1UL << PGDIR_SHIFT)
 37#define PGDIR_MASK		(~(PGDIR_SIZE-1))
 38/* FIXME */
 39
 40#define PAGE_NONE	__pgprot(0)
 41#define PAGE_SHARED	__pgprot(0)
 42#define PAGE_COPY	__pgprot(0)
 43#define PAGE_READONLY	__pgprot(0)
 44#define PAGE_KERNEL	__pgprot(0)
 45
 46#define swapper_pg_dir ((pgd_t *) 0)
 47
 48#define __swp_type(x)		(0)
 49#define __swp_offset(x)		(0)
 50#define __swp_entry(typ,off)	((swp_entry_t) { ((typ) | ((off) << 7)) })
 51#define __pte_to_swp_entry(pte)	((swp_entry_t) { pte_val(pte) })
 52#define __swp_entry_to_pte(x)	((pte_t) { (x).val })
 53
 54
 55typedef pte_t *pte_addr_t;
 56
 57/*
 58 * ZERO_PAGE is a global shared page that is always zero: used
 59 * for zero-mapped memory areas etc..
 60 */
 61#define ZERO_PAGE(vaddr)	(virt_to_page(0))
 62
 63/*
 64 * Mark the prot value as uncacheable and unbufferable.
 65 */
 66#define pgprot_noncached(prot)	__pgprot(0)
 67#define pgprot_writecombine(prot) __pgprot(0)
 68#define pgprot_dmacoherent(prot) __pgprot(0)
 69
 70
 71/*
 72 * These would be in other places but having them here reduces the diffs.
 73 */
 74extern unsigned int kobjsize(const void *objp);
 75
 76/*
 77 * No page table caches to initialise.
 78 */
 79#define pgtable_cache_init()	do { } while (0)
 80
 81/*
 82 * All 32bit addresses are effectively valid for vmalloc...
 83 * Sort of meaningless for non-VM targets.
 84 */
 85#define	VMALLOC_START	0UL
 86#define	VMALLOC_END	0xffffffffUL
 87
 88#define FIRST_USER_ADDRESS      0UL
 89
 90#include <asm-generic/pgtable.h>
 91
 92#else 
 93
 94/*
 95 * dummy tlb and user structures.
 96 */
 97#define v3_tlb_fns	(0)
 98#define v4_tlb_fns	(0)
 99#define v4wb_tlb_fns	(0)
100#define v4wbi_tlb_fns	(0)
101#define v6wbi_tlb_fns	(0)
102#define v7wbi_tlb_fns	(0)
103
104#define v3_user_fns	(0)
105#define v4_user_fns	(0)
106#define v4_mc_user_fns	(0)
107#define v4wb_user_fns	(0)
108#define v4wt_user_fns	(0)
109#define v6_user_fns	(0)
110#define xscale_mc_user_fns (0)
111
112#endif /*__ASSEMBLY__*/
113
114#endif /* _ASMARM_PGTABLE_H */