1 /* SPDX-License-Identifier: GPL-2.0-only */
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>
9 #ifndef _ASM_RISCV_PAGE_H
10 #define _ASM_RISCV_PAGE_H
12 #include <linux/pfn.h>
13 #include <linux/const.h>
15 #define PAGE_SHIFT (12)
16 #define PAGE_SIZE (_AC(1, UL) << PAGE_SHIFT)
17 #define PAGE_MASK (~(PAGE_SIZE - 1))
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)
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).
31 #define PAGE_OFFSET kernel_map.page_offset
33 #define PAGE_OFFSET _AC(CONFIG_PAGE_OFFSET, UL)
36 * By default, CONFIG_PAGE_OFFSET value corresponds to SV48 address space so
37 * define the PAGE_OFFSET value for SV39.
39 #define PAGE_OFFSET_L4 _AC(0xffffaf8000000000, UL)
40 #define PAGE_OFFSET_L3 _AC(0xffffffd800000000, UL)
42 #define PAGE_OFFSET _AC(CONFIG_PAGE_OFFSET, UL)
43 #endif /* CONFIG_64BIT */
47 #define clear_page(pgaddr) memset((pgaddr), 0, PAGE_SIZE)
48 #define copy_page(to, from) memcpy((to), (from), PAGE_SIZE)
50 #define clear_user_page(pgaddr, vaddr, page) memset((pgaddr), 0, PAGE_SIZE)
51 #define copy_user_page(vto, vfrom, vaddr, topg) \
52 memcpy((vto), (vfrom), PAGE_SIZE)
55 * Use struct definitions to apply C type checking
58 /* Page Global Directory entry */
63 /* Page Table entry */
72 typedef struct page *pgtable_t;
74 #define pte_val(x) ((x).pte)
75 #define pgd_val(x) ((x).pgd)
76 #define pgprot_val(x) ((x).pgprot)
78 #define __pte(x) ((pte_t) { (x) })
79 #define __pgd(x) ((pgd_t) { (x) })
80 #define __pgprot(x) ((pgprot_t) { (x) })
83 #define PTE_FMT "%016lx"
85 #define PTE_FMT "%08lx"
89 extern unsigned long riscv_pfn_base;
90 #define ARCH_PFN_OFFSET (riscv_pfn_base)
92 #define ARCH_PFN_OFFSET (PAGE_OFFSET >> PAGE_SHIFT)
93 #endif /* CONFIG_MMU */
95 struct kernel_mapping {
96 unsigned long page_offset;
97 unsigned long virt_addr;
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 va_kernel_pa_offset;
104 unsigned long va_kernel_xip_pa_offset;
105 #ifdef CONFIG_XIP_KERNEL
111 extern struct kernel_mapping kernel_map;
112 extern phys_addr_t phys_ram_base;
114 #define is_kernel_mapping(x) \
115 ((x) >= kernel_map.virt_addr && (x) < (kernel_map.virt_addr + kernel_map.size))
117 #define is_linear_mapping(x) \
118 ((x) >= PAGE_OFFSET && (!IS_ENABLED(CONFIG_64BIT) || (x) < PAGE_OFFSET + KERN_VIRT_SIZE))
120 #define linear_mapping_pa_to_va(x) ((void *)((unsigned long)(x) + kernel_map.va_pa_offset))
121 #define kernel_mapping_pa_to_va(y) ({ \
122 unsigned long _y = (unsigned long)(y); \
123 (IS_ENABLED(CONFIG_XIP_KERNEL) && _y < phys_ram_base) ? \
124 (void *)(_y + kernel_map.va_kernel_xip_pa_offset) : \
125 (void *)(_y + kernel_map.va_kernel_pa_offset + XIP_OFFSET); \
127 #define __pa_to_va_nodebug(x) linear_mapping_pa_to_va(x)
129 #define linear_mapping_va_to_pa(x) ((unsigned long)(x) - kernel_map.va_pa_offset)
130 #define kernel_mapping_va_to_pa(y) ({ \
131 unsigned long _y = (unsigned long)(y); \
132 (IS_ENABLED(CONFIG_XIP_KERNEL) && _y < kernel_map.virt_addr + XIP_OFFSET) ? \
133 (_y - kernel_map.va_kernel_xip_pa_offset) : \
134 (_y - kernel_map.va_kernel_pa_offset - XIP_OFFSET); \
137 #define __va_to_pa_nodebug(x) ({ \
138 unsigned long _x = x; \
139 is_linear_mapping(_x) ? \
140 linear_mapping_va_to_pa(_x) : kernel_mapping_va_to_pa(_x); \
143 #ifdef CONFIG_DEBUG_VIRTUAL
144 extern phys_addr_t __virt_to_phys(unsigned long x);
145 extern phys_addr_t __phys_addr_symbol(unsigned long x);
147 #define __virt_to_phys(x) __va_to_pa_nodebug(x)
148 #define __phys_addr_symbol(x) __va_to_pa_nodebug(x)
149 #endif /* CONFIG_DEBUG_VIRTUAL */
151 #define __pa_symbol(x) __phys_addr_symbol(RELOC_HIDE((unsigned long)(x), 0))
152 #define __pa(x) __virt_to_phys((unsigned long)(x))
153 #define __va(x) ((void *)__pa_to_va_nodebug((phys_addr_t)(x)))
155 #define phys_to_pfn(phys) (PFN_DOWN(phys))
156 #define pfn_to_phys(pfn) (PFN_PHYS(pfn))
158 #define virt_to_pfn(vaddr) (phys_to_pfn(__pa(vaddr)))
159 #define pfn_to_virt(pfn) (__va(pfn_to_phys(pfn)))
161 #define virt_to_page(vaddr) (pfn_to_page(virt_to_pfn(vaddr)))
162 #define page_to_virt(page) (pfn_to_virt(page_to_pfn(page)))
164 #define page_to_phys(page) (pfn_to_phys(page_to_pfn(page)))
165 #define phys_to_page(paddr) (pfn_to_page(phys_to_pfn(paddr)))
167 #define sym_to_pfn(x) __phys_to_pfn(__pa_symbol(x))
169 #endif /* __ASSEMBLY__ */
171 #define virt_addr_valid(vaddr) ({ \
172 unsigned long _addr = (unsigned long)vaddr; \
173 (unsigned long)(_addr) >= PAGE_OFFSET && pfn_valid(virt_to_pfn(_addr)); \
176 #define VM_DATA_DEFAULT_FLAGS VM_DATA_FLAGS_NON_EXEC
178 #include <asm-generic/memory_model.h>
179 #include <asm-generic/getorder.h>
181 #endif /* _ASM_RISCV_PAGE_H */