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 * ZERO_PAGE is a global shared page that is always zero: used
49 * for zero-mapped memory areas etc..
50 */
51#define ZERO_PAGE(vaddr)	(virt_to_page(0))
52
53/*
54 * Mark the prot value as uncacheable and unbufferable.
55 */
56#define pgprot_noncached(prot)	(prot)
57#define pgprot_writecombine(prot) (prot)
58#define pgprot_device(prot)	(prot)
59
60
61/*
62 * These would be in other places but having them here reduces the diffs.
63 */
64extern unsigned int kobjsize(const void *objp);
65
66/*
67 * All 32bit addresses are effectively valid for vmalloc...
68 * Sort of meaningless for non-VM targets.
69 */
70#define	VMALLOC_START	0UL
71#define	VMALLOC_END	0xffffffffUL
72
73#define FIRST_USER_ADDRESS      0UL
 
 
74
75#else 
76
77/*
78 * dummy tlb and user structures.
79 */
80#define v3_tlb_fns	(0)
81#define v4_tlb_fns	(0)
82#define v4wb_tlb_fns	(0)
83#define v4wbi_tlb_fns	(0)
84#define v6wbi_tlb_fns	(0)
85#define v7wbi_tlb_fns	(0)
86
87#define v3_user_fns	(0)
88#define v4_user_fns	(0)
89#define v4_mc_user_fns	(0)
90#define v4wb_user_fns	(0)
91#define v4wt_user_fns	(0)
92#define v6_user_fns	(0)
93#define xscale_mc_user_fns (0)
94
95#endif /*__ASSEMBLY__*/
96
97#endif /* _ASMARM_PGTABLE_H */

  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#define	pmd_offset(a, b)	((void *)0)
 26/* FIXME */
 27/*
 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
 30 */
 31#define PGDIR_SHIFT		21
 32
 33#define PGDIR_SIZE		(1UL << PGDIR_SHIFT)
 34#define PGDIR_MASK		(~(PGDIR_SIZE-1))
 35/* FIXME */
 36
 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)
 42
 43#define swapper_pg_dir ((pgd_t *) 0)
 44
 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 })
 50
 51
 52typedef pte_t *pte_addr_t;
 53
 54/*
 55 * ZERO_PAGE is a global shared page that is always zero: used
 56 * for zero-mapped memory areas etc..
 57 */
 58#define ZERO_PAGE(vaddr)	(virt_to_page(0))
 59
 60/*
 61 * Mark the prot value as uncacheable and unbufferable.
 62 */
 63#define pgprot_noncached(prot)	(prot)
 64#define pgprot_writecombine(prot) (prot)
 65#define pgprot_device(prot)	(prot)
 66
 67
 68/*
 69 * These would be in other places but having them here reduces the diffs.
 70 */
 71extern unsigned int kobjsize(const void *objp);
 72
 73/*
 74 * All 32bit addresses are effectively valid for vmalloc...
 75 * Sort of meaningless for non-VM targets.
 76 */
 77#define	VMALLOC_START	0UL
 78#define	VMALLOC_END	0xffffffffUL
 79
 80#define FIRST_USER_ADDRESS      0UL
 81
 82#include <asm-generic/pgtable.h>
 83
 84#else 
 85
 86/*
 87 * dummy tlb and user structures.
 88 */
 89#define v3_tlb_fns	(0)
 90#define v4_tlb_fns	(0)
 91#define v4wb_tlb_fns	(0)
 92#define v4wbi_tlb_fns	(0)
 93#define v6wbi_tlb_fns	(0)
 94#define v7wbi_tlb_fns	(0)
 95
 96#define v3_user_fns	(0)
 97#define v4_user_fns	(0)
 98#define v4_mc_user_fns	(0)
 99#define v4wb_user_fns	(0)
100#define v4wt_user_fns	(0)
101#define v6_user_fns	(0)
102#define xscale_mc_user_fns (0)
103
104#endif /*__ASSEMBLY__*/
105
106#endif /* _ASMARM_PGTABLE_H */