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_MMU
30 #ifdef CONFIG_64BIT
31 #define PAGE_OFFSET kernel_map.page_offset
32 /*
33 * By default, CONFIG_PAGE_OFFSET value corresponds to SV57 address space so
34 * define the PAGE_OFFSET value for SV48 and SV39.
35 */
36 #define PAGE_OFFSET_L4 _AC(0xffffaf8000000000, UL)
37 #define PAGE_OFFSET_L3 _AC(0xffffffd600000000, UL)
38 #else
39 #define PAGE_OFFSET _AC(CONFIG_PAGE_OFFSET, UL)
40 #endif /* CONFIG_64BIT */
41 #else
42 #define PAGE_OFFSET ((unsigned long)phys_ram_base)
43 #endif /* CONFIG_MMU */
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 #define ARCH_PFN_OFFSET (PFN_DOWN((unsigned long)phys_ram_base))
101
102 struct kernel_mapping {
103 unsigned long page_offset;
104 unsigned long virt_addr;
105 unsigned long virt_offset;
106 uintptr_t phys_addr;
107 uintptr_t size;
108 /* Offset between linear mapping virtual address and kernel load address */
109 unsigned long va_pa_offset;
110 /* Offset between kernel mapping virtual address and kernel load address */
111 #ifdef CONFIG_XIP_KERNEL
112 unsigned long va_kernel_xip_text_pa_offset;
113 unsigned long va_kernel_xip_data_pa_offset;
114 uintptr_t xiprom;
115 uintptr_t xiprom_sz;
116 #else
117 unsigned long va_kernel_pa_offset;
118 #endif
119 };
120
121 extern struct kernel_mapping kernel_map;
122 extern phys_addr_t phys_ram_base;
123 extern unsigned long vmemmap_start_pfn;
124
125 #define is_kernel_mapping(x) \
126 ((x) >= kernel_map.virt_addr && (x) < (kernel_map.virt_addr + kernel_map.size))
127
128 #define is_linear_mapping(x) \
129 ((x) >= PAGE_OFFSET && (!IS_ENABLED(CONFIG_64BIT) || (x) < PAGE_OFFSET + KERN_VIRT_SIZE))
130
131 #ifndef CONFIG_DEBUG_VIRTUAL
132 #define linear_mapping_pa_to_va(x) ((void *)((unsigned long)(x) + kernel_map.va_pa_offset))
133 #else
134 void *linear_mapping_pa_to_va(unsigned long x);
135 #endif
136
137 #ifdef CONFIG_XIP_KERNEL
138 #define kernel_mapping_pa_to_va(y) ({ \
139 unsigned long _y = (unsigned long)(y); \
140 (_y < phys_ram_base) ? \
141 (void *)(_y + kernel_map.va_kernel_xip_text_pa_offset) : \
142 (void *)(_y + kernel_map.va_kernel_xip_data_pa_offset); \
143 })
144 #else
145 #define kernel_mapping_pa_to_va(y) ((void *)((unsigned long)(y) + kernel_map.va_kernel_pa_offset))
146 #endif
147
148 #define __pa_to_va_nodebug(x) linear_mapping_pa_to_va(x)
149
150 #ifndef CONFIG_DEBUG_VIRTUAL
151 #define linear_mapping_va_to_pa(x) ((unsigned long)(x) - kernel_map.va_pa_offset)
152 #else
153 phys_addr_t linear_mapping_va_to_pa(unsigned long x);
154 #endif
155
156 #ifdef CONFIG_XIP_KERNEL
157 #define kernel_mapping_va_to_pa(y) ({ \
158 unsigned long _y = (unsigned long)(y); \
159 (_y < kernel_map.virt_addr + kernel_map.xiprom_sz) ? \
160 (_y - kernel_map.va_kernel_xip_text_pa_offset) : \
161 (_y - kernel_map.va_kernel_xip_data_pa_offset); \
162 })
163 #else
164 #define kernel_mapping_va_to_pa(y) ((unsigned long)(y) - kernel_map.va_kernel_pa_offset)
165 #endif
166
167 #define __va_to_pa_nodebug(x) ({ \
168 unsigned long _x = x; \
169 is_linear_mapping(_x) ? \
170 linear_mapping_va_to_pa(_x) : kernel_mapping_va_to_pa(_x); \
171 })
172
173 #ifdef CONFIG_DEBUG_VIRTUAL
174 extern phys_addr_t __virt_to_phys(unsigned long x);
175 extern phys_addr_t __phys_addr_symbol(unsigned long x);
176 #else
177 #define __virt_to_phys(x) __va_to_pa_nodebug(x)
178 #define __phys_addr_symbol(x) __va_to_pa_nodebug(x)
179 #endif /* CONFIG_DEBUG_VIRTUAL */
180
181 #define __pa_symbol(x) __phys_addr_symbol(RELOC_HIDE((unsigned long)(x), 0))
182 #define __pa(x) __virt_to_phys((unsigned long)(x))
183 #define __va(x) ((void *)__pa_to_va_nodebug((phys_addr_t)(x)))
184
185 #define phys_to_pfn(phys) (PFN_DOWN(phys))
186 #define pfn_to_phys(pfn) (PFN_PHYS(pfn))
187
188 #define virt_to_pfn(vaddr) (phys_to_pfn(__pa(vaddr)))
189 #define pfn_to_virt(pfn) (__va(pfn_to_phys(pfn)))
190
191 #define virt_to_page(vaddr) (pfn_to_page(virt_to_pfn(vaddr)))
192 #define page_to_virt(page) (pfn_to_virt(page_to_pfn(page)))
193
194 #define sym_to_pfn(x) __phys_to_pfn(__pa_symbol(x))
195
196 unsigned long kaslr_offset(void);
197
pfn_to_kaddr(unsigned long pfn)198 static __always_inline void *pfn_to_kaddr(unsigned long pfn)
199 {
200 return __va(pfn << PAGE_SHIFT);
201 }
202
203 #endif /* __ASSEMBLY__ */
204
205 #define virt_addr_valid(vaddr) ({ \
206 unsigned long _addr = (unsigned long)vaddr; \
207 (unsigned long)(_addr) >= PAGE_OFFSET && pfn_valid(virt_to_pfn(_addr)); \
208 })
209
210 #define VM_DATA_DEFAULT_FLAGS VM_DATA_FLAGS_NON_EXEC
211
212 #include <asm-generic/memory_model.h>
213 #include <asm-generic/getorder.h>
214
215 #endif /* _ASM_RISCV_PAGE_H */
216