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Linux kernel mirror (for testing)
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1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Copyright (C) 2009 Chen Liqin <liqin.chen@sunplusct.com>
4 * Copyright (C) 2012 Regents of the University of California
5 * Copyright (C) 2017 SiFive
6 * Copyright (C) 2017 XiaojingZhu <zhuxiaoj@ict.ac.cn>
7 */
8
9#ifndef _ASM_RISCV_PAGE_H
10#define _ASM_RISCV_PAGE_H
11
12#include <linux/pfn.h>
13#include <linux/const.h>
14
15#define PAGE_SHIFT (12)
16#define PAGE_SIZE (_AC(1, UL) << PAGE_SHIFT)
17#define PAGE_MASK (~(PAGE_SIZE - 1))
18
19#ifdef CONFIG_64BIT
20#define HUGE_MAX_HSTATE 2
21#else
22#define HUGE_MAX_HSTATE 1
23#endif
24#define HPAGE_SHIFT PMD_SHIFT
25#define HPAGE_SIZE (_AC(1, UL) << HPAGE_SHIFT)
26#define HPAGE_MASK (~(HPAGE_SIZE - 1))
27#define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
28
29/*
30 * PAGE_OFFSET -- the first address of the first page of memory.
31 * When not using MMU this corresponds to the first free page in
32 * physical memory (aligned on a page boundary).
33 */
34#define PAGE_OFFSET _AC(CONFIG_PAGE_OFFSET, UL)
35
36#define KERN_VIRT_SIZE (-PAGE_OFFSET)
37
38#ifndef __ASSEMBLY__
39
40#define PAGE_UP(addr) (((addr)+((PAGE_SIZE)-1))&(~((PAGE_SIZE)-1)))
41#define PAGE_DOWN(addr) ((addr)&(~((PAGE_SIZE)-1)))
42
43/* align addr on a size boundary - adjust address up/down if needed */
44#define _ALIGN_UP(addr, size) (((addr)+((size)-1))&(~((size)-1)))
45#define _ALIGN_DOWN(addr, size) ((addr)&(~((size)-1)))
46
47/* align addr on a size boundary - adjust address up if needed */
48#define _ALIGN(addr, size) _ALIGN_UP(addr, size)
49
50#define clear_page(pgaddr) memset((pgaddr), 0, PAGE_SIZE)
51#define copy_page(to, from) memcpy((to), (from), PAGE_SIZE)
52
53#define clear_user_page(pgaddr, vaddr, page) memset((pgaddr), 0, PAGE_SIZE)
54#define copy_user_page(vto, vfrom, vaddr, topg) \
55 memcpy((vto), (vfrom), PAGE_SIZE)
56
57/*
58 * Use struct definitions to apply C type checking
59 */
60
61/* Page Global Directory entry */
62typedef struct {
63 unsigned long pgd;
64} pgd_t;
65
66/* Page Table entry */
67typedef struct {
68 unsigned long pte;
69} pte_t;
70
71typedef struct {
72 unsigned long pgprot;
73} pgprot_t;
74
75typedef struct page *pgtable_t;
76
77#define pte_val(x) ((x).pte)
78#define pgd_val(x) ((x).pgd)
79#define pgprot_val(x) ((x).pgprot)
80
81#define __pte(x) ((pte_t) { (x) })
82#define __pgd(x) ((pgd_t) { (x) })
83#define __pgprot(x) ((pgprot_t) { (x) })
84
85#ifdef CONFIG_64BIT
86#define PTE_FMT "%016lx"
87#else
88#define PTE_FMT "%08lx"
89#endif
90
91#ifdef CONFIG_MMU
92extern unsigned long va_pa_offset;
93extern unsigned long pfn_base;
94#define ARCH_PFN_OFFSET (pfn_base)
95#else
96#define va_pa_offset 0
97#define ARCH_PFN_OFFSET (PAGE_OFFSET >> PAGE_SHIFT)
98#endif /* CONFIG_MMU */
99
100#define __pa_to_va_nodebug(x) ((void *)((unsigned long) (x) + va_pa_offset))
101#define __va_to_pa_nodebug(x) ((unsigned long)(x) - va_pa_offset)
102
103#ifdef CONFIG_DEBUG_VIRTUAL
104extern phys_addr_t __virt_to_phys(unsigned long x);
105extern phys_addr_t __phys_addr_symbol(unsigned long x);
106#else
107#define __virt_to_phys(x) __va_to_pa_nodebug(x)
108#define __phys_addr_symbol(x) __va_to_pa_nodebug(x)
109#endif /* CONFIG_DEBUG_VIRTUAL */
110
111#define __pa_symbol(x) __phys_addr_symbol(RELOC_HIDE((unsigned long)(x), 0))
112#define __pa(x) __virt_to_phys((unsigned long)(x))
113#define __va(x) ((void *)__pa_to_va_nodebug((phys_addr_t)(x)))
114
115#define phys_to_pfn(phys) (PFN_DOWN(phys))
116#define pfn_to_phys(pfn) (PFN_PHYS(pfn))
117
118#define virt_to_pfn(vaddr) (phys_to_pfn(__pa(vaddr)))
119#define pfn_to_virt(pfn) (__va(pfn_to_phys(pfn)))
120
121#define virt_to_page(vaddr) (pfn_to_page(virt_to_pfn(vaddr)))
122#define page_to_virt(page) (pfn_to_virt(page_to_pfn(page)))
123
124#define page_to_phys(page) (pfn_to_phys(page_to_pfn(page)))
125#define page_to_bus(page) (page_to_phys(page))
126#define phys_to_page(paddr) (pfn_to_page(phys_to_pfn(paddr)))
127
128#ifdef CONFIG_FLATMEM
129#define pfn_valid(pfn) \
130 (((pfn) >= ARCH_PFN_OFFSET) && (((pfn) - ARCH_PFN_OFFSET) < max_mapnr))
131#endif
132
133#endif /* __ASSEMBLY__ */
134
135#define virt_addr_valid(vaddr) ({ \
136 unsigned long _addr = (unsigned long)vaddr; \
137 (unsigned long)(_addr) >= PAGE_OFFSET && pfn_valid(virt_to_pfn(_addr)); \
138})
139
140#define VM_DATA_DEFAULT_FLAGS VM_DATA_FLAGS_NON_EXEC
141
142#include <asm-generic/memory_model.h>
143#include <asm-generic/getorder.h>
144
145#endif /* _ASM_RISCV_PAGE_H */