xref: /kernel/linux/linux-6.6/arch/arc/include/asm/page.h (revision 62306a36) 
1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
4 */
5#ifndef __ASM_ARC_PAGE_H
6#define __ASM_ARC_PAGE_H
7
8#include <uapi/asm/page.h>
9
10#ifdef CONFIG_ARC_HAS_PAE40
11
12#define MAX_POSSIBLE_PHYSMEM_BITS	40
13#define PAGE_MASK_PHYS			(0xff00000000ull | PAGE_MASK)
14
15#else /* CONFIG_ARC_HAS_PAE40 */
16
17#define MAX_POSSIBLE_PHYSMEM_BITS	32
18#define PAGE_MASK_PHYS			PAGE_MASK
19
20#endif /* CONFIG_ARC_HAS_PAE40 */
21
22#ifndef __ASSEMBLY__
23
24#define clear_page(paddr)		memset((paddr), 0, PAGE_SIZE)
25#define copy_user_page(to, from, vaddr, pg)	copy_page(to, from)
26#define copy_page(to, from)		memcpy((to), (from), PAGE_SIZE)
27
28struct vm_area_struct;
29struct page;
30
31#define __HAVE_ARCH_COPY_USER_HIGHPAGE
32
33void copy_user_highpage(struct page *to, struct page *from,
34			unsigned long u_vaddr, struct vm_area_struct *vma);
35void clear_user_page(void *to, unsigned long u_vaddr, struct page *page);
36
37typedef struct {
38	unsigned long pgd;
39} pgd_t;
40
41#define pgd_val(x)	((x).pgd)
42#define __pgd(x)	((pgd_t) { (x) })
43
44#if CONFIG_PGTABLE_LEVELS > 3
45
46typedef struct {
47	unsigned long pud;
48} pud_t;
49
50#define pud_val(x)      	((x).pud)
51#define __pud(x)        	((pud_t) { (x) })
52
53#endif
54
55#if CONFIG_PGTABLE_LEVELS > 2
56
57typedef struct {
58	unsigned long pmd;
59} pmd_t;
60
61#define pmd_val(x)	((x).pmd)
62#define __pmd(x)	((pmd_t) { (x) })
63
64#endif
65
66typedef struct {
67#ifdef CONFIG_ARC_HAS_PAE40
68	unsigned long long pte;
69#else
70	unsigned long pte;
71#endif
72} pte_t;
73
74#define pte_val(x)	((x).pte)
75#define __pte(x)	((pte_t) { (x) })
76
77typedef struct {
78	unsigned long pgprot;
79} pgprot_t;
80
81#define pgprot_val(x)	((x).pgprot)
82#define __pgprot(x)	((pgprot_t) { (x) })
83#define pte_pgprot(x)	__pgprot(pte_val(x))
84
85typedef struct page *pgtable_t;
86
87/*
88 * Use virt_to_pfn with caution:
89 * If used in pte or paddr related macros, it could cause truncation
90 * in PAE40 builds
91 * As a rule of thumb, only use it in helpers starting with virt_
92 * You have been warned !
93 */
94#define virt_to_pfn(kaddr)	(__pa(kaddr) >> PAGE_SHIFT)
95
96/*
97 * When HIGHMEM is enabled we have holes in the memory map so we need
98 * pfn_valid() that takes into account the actual extents of the physical
99 * memory
100 */
101#ifdef CONFIG_HIGHMEM
102
103extern unsigned long arch_pfn_offset;
104#define ARCH_PFN_OFFSET		arch_pfn_offset
105
106extern int pfn_valid(unsigned long pfn);
107#define pfn_valid		pfn_valid
108
109#else /* CONFIG_HIGHMEM */
110
111#define ARCH_PFN_OFFSET		virt_to_pfn((void *)CONFIG_LINUX_RAM_BASE)
112
113#endif /* CONFIG_HIGHMEM */
114
115/*
116 * __pa, __va, virt_to_page (ALERT: deprecated, don't use them)
117 *
118 * These macros have historically been misnamed
119 * virt here means link-address/program-address as embedded in object code.
120 * And for ARC, link-addr = physical address
121 */
122#define __pa(vaddr)  		((unsigned long)(vaddr))
123#define __va(paddr)  		((void *)((unsigned long)(paddr)))
124
125#define virt_to_page(kaddr)	pfn_to_page(virt_to_pfn(kaddr))
126#define virt_addr_valid(kaddr)  pfn_valid(virt_to_pfn(kaddr))
127
128/* Default Permissions for stack/heaps pages (Non Executable) */
129#define VM_DATA_DEFAULT_FLAGS	VM_DATA_FLAGS_NON_EXEC
130
131#define WANT_PAGE_VIRTUAL   1
132
133#include <asm-generic/memory_model.h>   /* page_to_pfn, pfn_to_page */
134#include <asm-generic/getorder.h>
135
136#endif /* !__ASSEMBLY__ */
137
138#endif
139