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 #include <vdso/page.h>
16
17 #define HPAGE_SHIFT PMD_SHIFT
18 #define HPAGE_SIZE (_AC(1, UL) << HPAGE_SHIFT)
19 #define HPAGE_MASK (~(HPAGE_SIZE - 1))
20 #define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
21
22 /*
23 * PAGE_OFFSET -- the first address of the first page of memory.
24 * When not using MMU this corresponds to the first free page in
25 * physical memory (aligned on a page boundary).
26 */
27 #ifdef CONFIG_MMU
28 #ifdef CONFIG_64BIT
29 #define PAGE_OFFSET_L5 _AC(0xff60000000000000, UL)
30 #define PAGE_OFFSET_L4 _AC(0xffffaf8000000000, UL)
31 #define PAGE_OFFSET_L3 _AC(0xffffffd600000000, UL)
32 #define PAGE_OFFSET kernel_map.page_offset
33 #else
34 #define PAGE_OFFSET _AC(0xc0000000, UL)
35 #endif /* CONFIG_64BIT */
36 #else
37 #define PAGE_OFFSET ((unsigned long)phys_ram_base)
38 #endif /* CONFIG_MMU */
39
40 #ifndef __ASSEMBLER__
41
42 #ifdef CONFIG_RISCV_ISA_ZICBOZ
43 void clear_page(void *page);
44 #else
45 #define clear_page(pgaddr) memset((pgaddr), 0, PAGE_SIZE)
46 #endif
47 #define copy_page(to, from) memcpy((to), (from), PAGE_SIZE)
48
49 #define copy_user_page(vto, vfrom, vaddr, topg) copy_page(vto, vfrom)
50
51 /*
52 * Use struct definitions to apply C type checking
53 */
54
55 /* Page Global Directory entry */
56 typedef struct {
57 unsigned long pgd;
58 } pgd_t;
59
60 /* Page Table entry */
61 typedef struct {
62 unsigned long pte;
63 } pte_t;
64
65 typedef struct {
66 unsigned long pgprot;
67 } pgprot_t;
68
69 typedef struct page *pgtable_t;
70
71 #define pte_val(x) ((x).pte)
72 #define pgd_val(x) ((x).pgd)
73 #define pgprot_val(x) ((x).pgprot)
74
75 #define __pte(x) ((pte_t) { (x) })
76 #define __pgd(x) ((pgd_t) { (x) })
77 #define __pgprot(x) ((pgprot_t) { (x) })
78
79 #ifdef CONFIG_64BIT
80 #define PTE_FMT "%016lx"
81 #else
82 #define PTE_FMT "%08lx"
83 #endif
84
85 #if defined(CONFIG_64BIT) && defined(CONFIG_MMU)
86 /*
87 * We override this value as its generic definition uses __pa too early in
88 * the boot process (before kernel_map.va_pa_offset is set).
89 */
90 #define MIN_MEMBLOCK_ADDR 0
91 #endif
92
93 #define ARCH_PFN_OFFSET (PFN_DOWN((unsigned long)phys_ram_base))
94
95 struct kernel_mapping {
96 unsigned long virt_addr;
97 unsigned long virt_offset;
98 uintptr_t phys_addr;
99 uintptr_t size;
100 /* Offset between linear mapping virtual address and kernel load address */
101 unsigned long va_pa_offset;
102 /* Offset between kernel mapping virtual address and kernel load address */
103 unsigned long page_offset;
104 unsigned long va_kernel_pa_offset;
105 };
106
107 extern struct kernel_mapping kernel_map;
108 extern phys_addr_t phys_ram_base;
109 extern unsigned long vmemmap_start_pfn;
110
111 #define is_kernel_mapping(x) \
112 ((x) >= kernel_map.virt_addr && (x) < (kernel_map.virt_addr + kernel_map.size))
113
114 #define is_linear_mapping(x) \
115 ((x) >= PAGE_OFFSET && (!IS_ENABLED(CONFIG_64BIT) || (x) < PAGE_OFFSET + KERN_VIRT_SIZE))
116
117 #ifndef CONFIG_DEBUG_VIRTUAL
118 #define linear_mapping_pa_to_va(x) ((void *)((unsigned long)(x) + kernel_map.va_pa_offset))
119 #else
120 void *linear_mapping_pa_to_va(unsigned long x);
121 #endif
122
123 #define kernel_mapping_pa_to_va(y) ((void *)((unsigned long)(y) + kernel_map.va_kernel_pa_offset))
124
125 #define __pa_to_va_nodebug(x) linear_mapping_pa_to_va(x)
126
127 #ifndef CONFIG_DEBUG_VIRTUAL
128 #define linear_mapping_va_to_pa(x) ((unsigned long)(x) - kernel_map.va_pa_offset)
129 #else
130 phys_addr_t linear_mapping_va_to_pa(unsigned long x);
131 #endif
132
133 #define kernel_mapping_va_to_pa(y) ((unsigned long)(y) - kernel_map.va_kernel_pa_offset)
134
135 #define __va_to_pa_nodebug(x) ({ \
136 unsigned long _x = x; \
137 is_linear_mapping(_x) ? \
138 linear_mapping_va_to_pa(_x) : kernel_mapping_va_to_pa(_x); \
139 })
140
141 #ifdef CONFIG_DEBUG_VIRTUAL
142 extern phys_addr_t __virt_to_phys(unsigned long x);
143 extern phys_addr_t __phys_addr_symbol(unsigned long x);
144 #else
145 #define __virt_to_phys(x) __va_to_pa_nodebug(x)
146 #define __phys_addr_symbol(x) __va_to_pa_nodebug(x)
147 #endif /* CONFIG_DEBUG_VIRTUAL */
148
149 #define __pa_symbol(x) __phys_addr_symbol(RELOC_HIDE((unsigned long)(x), 0))
150 #define __pa(x) __virt_to_phys((unsigned long)(x))
151 #define __va(x) ((void *)__pa_to_va_nodebug((phys_addr_t)(x)))
152
153 #define phys_to_pfn(phys) (PFN_DOWN(phys))
154 #define pfn_to_phys(pfn) (PFN_PHYS(pfn))
155
156 #define virt_to_pfn(vaddr) (phys_to_pfn(__pa(vaddr)))
157 #define pfn_to_virt(pfn) (__va(pfn_to_phys(pfn)))
158
159 #define virt_to_page(vaddr) (pfn_to_page(virt_to_pfn(vaddr)))
160 #define page_to_virt(page) (pfn_to_virt(page_to_pfn(page)))
161
162 #define sym_to_pfn(x) __phys_to_pfn(__pa_symbol(x))
163
kaslr_offset(void)164 static inline unsigned long kaslr_offset(void)
165 {
166 return kernel_map.virt_offset;
167 }
168
pfn_to_kaddr(unsigned long pfn)169 static __always_inline void *pfn_to_kaddr(unsigned long pfn)
170 {
171 return __va(pfn << PAGE_SHIFT);
172 }
173
174 #endif /* __ASSEMBLER__ */
175
176 #define virt_addr_valid(vaddr) ({ \
177 unsigned long _addr = (unsigned long)vaddr; \
178 (unsigned long)(_addr) >= PAGE_OFFSET && pfn_valid(virt_to_pfn(_addr)); \
179 })
180
181 #define VMA_DATA_DEFAULT_FLAGS VMA_DATA_FLAGS_NON_EXEC
182
183 #include <asm-generic/memory_model.h>
184 #include <asm-generic/getorder.h>
185
186 #endif /* _ASM_RISCV_PAGE_H */
187