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 CONFIG_PAGE_SHIFT
16 #define PAGE_SIZE (_AC(1, UL) << PAGE_SHIFT)
17 #define PAGE_MASK (~(PAGE_SIZE - 1))
18
19 #define HPAGE_SHIFT PMD_SHIFT
20 #define HPAGE_SIZE (_AC(1, UL) << HPAGE_SHIFT)
21 #define HPAGE_MASK (~(HPAGE_SIZE - 1))
22 #define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
23
24 /*
25 * PAGE_OFFSET -- the first address of the first page of memory.
26 * When not using MMU this corresponds to the first free page in
27 * physical memory (aligned on a page boundary).
28 */
29 #ifdef CONFIG_64BIT
30 #ifdef CONFIG_MMU
31 #define PAGE_OFFSET kernel_map.page_offset
32 #else
33 #define PAGE_OFFSET _AC(CONFIG_PAGE_OFFSET, UL)
34 #endif
35 /*
36 * By default, CONFIG_PAGE_OFFSET value corresponds to SV57 address space so
37 * define the PAGE_OFFSET value for SV48 and SV39.
38 */
39 #define PAGE_OFFSET_L4 _AC(0xffffaf8000000000, UL)
40 #define PAGE_OFFSET_L3 _AC(0xffffffd600000000, UL)
41 #else
42 #define PAGE_OFFSET _AC(CONFIG_PAGE_OFFSET, UL)
43 #endif /* CONFIG_64BIT */
44
45 #ifndef __ASSEMBLY__
46
47 #ifdef CONFIG_RISCV_ISA_ZICBOZ
48 void clear_page(void *page);
49 #else
50 #define clear_page(pgaddr) memset((pgaddr), 0, PAGE_SIZE)
51 #endif
52 #define copy_page(to, from) memcpy((to), (from), PAGE_SIZE)
53
54 #define clear_user_page(pgaddr, vaddr, page) clear_page(pgaddr)
55 #define copy_user_page(vto, vfrom, vaddr, topg) \
56 memcpy((vto), (vfrom), PAGE_SIZE)
57
58 /*
59 * Use struct definitions to apply C type checking
60 */
61
62 /* Page Global Directory entry */
63 typedef struct {
64 unsigned long pgd;
65 } pgd_t;
66
67 /* Page Table entry */
68 typedef struct {
69 unsigned long pte;
70 } pte_t;
71
72 typedef struct {
73 unsigned long pgprot;
74 } pgprot_t;
75
76 typedef struct page *pgtable_t;
77
78 #define pte_val(x) ((x).pte)
79 #define pgd_val(x) ((x).pgd)
80 #define pgprot_val(x) ((x).pgprot)
81
82 #define __pte(x) ((pte_t) { (x) })
83 #define __pgd(x) ((pgd_t) { (x) })
84 #define __pgprot(x) ((pgprot_t) { (x) })
85
86 #ifdef CONFIG_64BIT
87 #define PTE_FMT "%016lx"
88 #else
89 #define PTE_FMT "%08lx"
90 #endif
91
92 #if defined(CONFIG_64BIT) && defined(CONFIG_MMU)
93 /*
94 * We override this value as its generic definition uses __pa too early in
95 * the boot process (before kernel_map.va_pa_offset is set).
96 */
97 #define MIN_MEMBLOCK_ADDR 0
98 #endif
99
100 #ifdef CONFIG_MMU
101 #define ARCH_PFN_OFFSET (PFN_DOWN((unsigned long)phys_ram_base))
102 #else
103 #define ARCH_PFN_OFFSET (PAGE_OFFSET >> PAGE_SHIFT)
104 #endif /* CONFIG_MMU */
105
106 struct kernel_mapping {
107 unsigned long page_offset;
108 unsigned long virt_addr;
109 unsigned long virt_offset;
110 uintptr_t phys_addr;
111 uintptr_t size;
112 /* Offset between linear mapping virtual address and kernel load address */
113 unsigned long va_pa_offset;
114 /* Offset between kernel mapping virtual address and kernel load address */
115 unsigned long va_kernel_pa_offset;
116 unsigned long va_kernel_xip_pa_offset;
117 #ifdef CONFIG_XIP_KERNEL
118 uintptr_t xiprom;
119 uintptr_t xiprom_sz;
120 #endif
121 };
122
123 extern struct kernel_mapping kernel_map;
124 extern phys_addr_t phys_ram_base;
125
126 #define is_kernel_mapping(x) \
127 ((x) >= kernel_map.virt_addr && (x) < (kernel_map.virt_addr + kernel_map.size))
128
129 #define is_linear_mapping(x) \
130 ((x) >= PAGE_OFFSET && (!IS_ENABLED(CONFIG_64BIT) || (x) < PAGE_OFFSET + KERN_VIRT_SIZE))
131
132 #ifndef CONFIG_DEBUG_VIRTUAL
133 #define linear_mapping_pa_to_va(x) ((void *)((unsigned long)(x) + kernel_map.va_pa_offset))
134 #else
135 void *linear_mapping_pa_to_va(unsigned long x);
136 #endif
137 #define kernel_mapping_pa_to_va(y) ({ \
138 unsigned long _y = (unsigned long)(y); \
139 (IS_ENABLED(CONFIG_XIP_KERNEL) && _y < phys_ram_base) ? \
140 (void *)(_y + kernel_map.va_kernel_xip_pa_offset) : \
141 (void *)(_y + kernel_map.va_kernel_pa_offset + XIP_OFFSET); \
142 })
143 #define __pa_to_va_nodebug(x) linear_mapping_pa_to_va(x)
144
145 #ifndef CONFIG_DEBUG_VIRTUAL
146 #define linear_mapping_va_to_pa(x) ((unsigned long)(x) - kernel_map.va_pa_offset)
147 #else
148 phys_addr_t linear_mapping_va_to_pa(unsigned long x);
149 #endif
150 #define kernel_mapping_va_to_pa(y) ({ \
151 unsigned long _y = (unsigned long)(y); \
152 (IS_ENABLED(CONFIG_XIP_KERNEL) && _y < kernel_map.virt_addr + XIP_OFFSET) ? \
153 (_y - kernel_map.va_kernel_xip_pa_offset) : \
154 (_y - kernel_map.va_kernel_pa_offset - XIP_OFFSET); \
155 })
156
157 #define __va_to_pa_nodebug(x) ({ \
158 unsigned long _x = x; \
159 is_linear_mapping(_x) ? \
160 linear_mapping_va_to_pa(_x) : kernel_mapping_va_to_pa(_x); \
161 })
162
163 #ifdef CONFIG_DEBUG_VIRTUAL
164 extern phys_addr_t __virt_to_phys(unsigned long x);
165 extern phys_addr_t __phys_addr_symbol(unsigned long x);
166 #else
167 #define __virt_to_phys(x) __va_to_pa_nodebug(x)
168 #define __phys_addr_symbol(x) __va_to_pa_nodebug(x)
169 #endif /* CONFIG_DEBUG_VIRTUAL */
170
171 #define __pa_symbol(x) __phys_addr_symbol(RELOC_HIDE((unsigned long)(x), 0))
172 #define __pa(x) __virt_to_phys((unsigned long)(x))
173 #define __va(x) ((void *)__pa_to_va_nodebug((phys_addr_t)(x)))
174
175 #define phys_to_pfn(phys) (PFN_DOWN(phys))
176 #define pfn_to_phys(pfn) (PFN_PHYS(pfn))
177
178 #define virt_to_pfn(vaddr) (phys_to_pfn(__pa(vaddr)))
179 #define pfn_to_virt(pfn) (__va(pfn_to_phys(pfn)))
180
181 #define virt_to_page(vaddr) (pfn_to_page(virt_to_pfn(vaddr)))
182 #define page_to_virt(page) (pfn_to_virt(page_to_pfn(page)))
183
184 #define page_to_phys(page) (pfn_to_phys(page_to_pfn(page)))
185 #define phys_to_page(paddr) (pfn_to_page(phys_to_pfn(paddr)))
186
187 #define sym_to_pfn(x) __phys_to_pfn(__pa_symbol(x))
188
189 unsigned long kaslr_offset(void);
190
191 static __always_inline void *pfn_to_kaddr(unsigned long pfn)
192 {
193 return __va(pfn << PAGE_SHIFT);
194 }
195
196 #endif /* __ASSEMBLY__ */
197
198 #define virt_addr_valid(vaddr) ({ \
199 unsigned long _addr = (unsigned long)vaddr; \
200 (unsigned long)(_addr) >= PAGE_OFFSET && pfn_valid(virt_to_pfn(_addr)); \
201 })
202
203 #define VM_DATA_DEFAULT_FLAGS VM_DATA_FLAGS_NON_EXEC
204
205 #include <asm-generic/memory_model.h>
206 #include <asm-generic/getorder.h>
207
208 #endif /* _ASM_RISCV_PAGE_H */
209
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.