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;
93#ifdef CONFIG_64BIT
94extern unsigned long va_kernel_pa_offset;
95#endif
96extern unsigned long pfn_base;
97#define ARCH_PFN_OFFSET		(pfn_base)
98#else
99#define va_pa_offset		0
100#ifdef CONFIG_64BIT
101#define va_kernel_pa_offset	0
102#endif
103#define ARCH_PFN_OFFSET		(PAGE_OFFSET >> PAGE_SHIFT)
104#endif /* CONFIG_MMU */
105
106extern unsigned long max_low_pfn;
107extern unsigned long min_low_pfn;
108
109extern unsigned long kernel_virt_addr;
110
111#ifdef CONFIG_64BIT
112#define linear_mapping_pa_to_va(x)	((void *)((unsigned long)(x) + va_pa_offset))
113#define kernel_mapping_pa_to_va(x)	((void *)((unsigned long)(x) + va_kernel_pa_offset))
114#define __pa_to_va_nodebug(x)		linear_mapping_pa_to_va(x)
115
116#define linear_mapping_va_to_pa(x)	((unsigned long)(x) - va_pa_offset)
117#define kernel_mapping_va_to_pa(x)	((unsigned long)(x) - va_kernel_pa_offset)
118#define __va_to_pa_nodebug(x)	({						\
119	unsigned long _x = x;							\
120	(_x < kernel_virt_addr) ?						\
121		linear_mapping_va_to_pa(_x) : kernel_mapping_va_to_pa(_x);	\
122	})
123#else
124#define __pa_to_va_nodebug(x)  ((void *)((unsigned long) (x) + va_pa_offset))
125#define __va_to_pa_nodebug(x)  ((unsigned long)(x) - va_pa_offset)
126#endif
127
128#ifdef CONFIG_DEBUG_VIRTUAL
129extern phys_addr_t __virt_to_phys(unsigned long x);
130extern phys_addr_t __phys_addr_symbol(unsigned long x);
131#else
132#define __virt_to_phys(x)	__va_to_pa_nodebug(x)
133#define __phys_addr_symbol(x)	__va_to_pa_nodebug(x)
134#endif /* CONFIG_DEBUG_VIRTUAL */
135
136#define __pa_symbol(x)	__phys_addr_symbol(RELOC_HIDE((unsigned long)(x), 0))
137#define __pa(x)		__virt_to_phys((unsigned long)(x))
138#define __va(x)		((void *)__pa_to_va_nodebug((phys_addr_t)(x)))
139
140#define phys_to_pfn(phys)	(PFN_DOWN(phys))
141#define pfn_to_phys(pfn)	(PFN_PHYS(pfn))
142
143#define virt_to_pfn(vaddr)	(phys_to_pfn(__pa(vaddr)))
144#define pfn_to_virt(pfn)	(__va(pfn_to_phys(pfn)))
145
146#define virt_to_page(vaddr)	(pfn_to_page(virt_to_pfn(vaddr)))
147#define page_to_virt(page)	(pfn_to_virt(page_to_pfn(page)))
148
149#define page_to_phys(page)	(pfn_to_phys(page_to_pfn(page)))
150#define page_to_bus(page)	(page_to_phys(page))
151#define phys_to_page(paddr)	(pfn_to_page(phys_to_pfn(paddr)))
152
153#ifdef CONFIG_FLATMEM
154#define pfn_valid(pfn) \
155	(((pfn) >= ARCH_PFN_OFFSET) && (((pfn) - ARCH_PFN_OFFSET) < max_mapnr))
156#endif
157
158#endif /* __ASSEMBLY__ */
159
160#define virt_addr_valid(vaddr)	({						\
161	unsigned long _addr = (unsigned long)vaddr;				\
162	(unsigned long)(_addr) >= PAGE_OFFSET && pfn_valid(virt_to_pfn(_addr));	\
163})
164
165#define VM_DATA_DEFAULT_FLAGS	VM_DATA_FLAGS_NON_EXEC
166
167#include <asm-generic/memory_model.h>
168#include <asm-generic/getorder.h>
169
170#endif /* _ASM_RISCV_PAGE_H */
171