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))
20 #define HUGE_MAX_HSTATE 2
22 #define HUGE_MAX_HSTATE 1
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)
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).
36 #define PAGE_OFFSET kernel_map.page_offset
38 #define PAGE_OFFSET _AC(CONFIG_PAGE_OFFSET, UL)
41 * By default, CONFIG_PAGE_OFFSET value corresponds to SV48 address space so
42 * define the PAGE_OFFSET value for SV39.
44 #define PAGE_OFFSET_L4 _AC(0xffffaf8000000000, UL)
45 #define PAGE_OFFSET_L3 _AC(0xffffffd800000000, UL)
47 #define PAGE_OFFSET _AC(CONFIG_PAGE_OFFSET, UL)
48 #endif /* CONFIG_64BIT */
52 #define clear_page(pgaddr) memset((pgaddr), 0, PAGE_SIZE)
53 #define copy_page(to, from) memcpy((to), (from), PAGE_SIZE)
55 #define clear_user_page(pgaddr, vaddr, page) memset((pgaddr), 0, PAGE_SIZE)
56 #define copy_user_page(vto, vfrom, vaddr, topg) \
57 memcpy((vto), (vfrom), PAGE_SIZE)
60 * Use struct definitions to apply C type checking
63 /* Page Global Directory entry */
68 /* Page Table entry */
77 typedef struct page *pgtable_t;
79 #define pte_val(x) ((x).pte)
80 #define pgd_val(x) ((x).pgd)
81 #define pgprot_val(x) ((x).pgprot)
83 #define __pte(x) ((pte_t) { (x) })
84 #define __pgd(x) ((pgd_t) { (x) })
85 #define __pgprot(x) ((pgprot_t) { (x) })
88 #define PTE_FMT "%016lx"
90 #define PTE_FMT "%08lx"
94 extern unsigned long riscv_pfn_base;
95 #define ARCH_PFN_OFFSET (riscv_pfn_base)
97 #define ARCH_PFN_OFFSET (PAGE_OFFSET >> PAGE_SHIFT)
98 #endif /* CONFIG_MMU */
100 struct kernel_mapping {
101 unsigned long page_offset;
102 unsigned long virt_addr;
105 /* Offset between linear mapping virtual address and kernel load address */
106 unsigned long va_pa_offset;
107 /* Offset between kernel mapping virtual address and kernel load address */
108 unsigned long va_kernel_pa_offset;
109 unsigned long va_kernel_xip_pa_offset;
110 #ifdef CONFIG_XIP_KERNEL
116 extern struct kernel_mapping kernel_map;
117 extern phys_addr_t phys_ram_base;
119 #define is_kernel_mapping(x) \
120 ((x) >= kernel_map.virt_addr && (x) < (kernel_map.virt_addr + kernel_map.size))
122 #define is_linear_mapping(x) \
123 ((x) >= PAGE_OFFSET && (!IS_ENABLED(CONFIG_64BIT) || (x) < PAGE_OFFSET + KERN_VIRT_SIZE))
125 #define linear_mapping_pa_to_va(x) ((void *)((unsigned long)(x) + kernel_map.va_pa_offset))
126 #define kernel_mapping_pa_to_va(y) ({ \
127 unsigned long _y = y; \
128 (IS_ENABLED(CONFIG_XIP_KERNEL) && _y < phys_ram_base) ? \
129 (void *)((unsigned long)(_y) + kernel_map.va_kernel_xip_pa_offset) : \
130 (void *)((unsigned long)(_y) + kernel_map.va_kernel_pa_offset + XIP_OFFSET); \
132 #define __pa_to_va_nodebug(x) linear_mapping_pa_to_va(x)
134 #define linear_mapping_va_to_pa(x) ((unsigned long)(x) - kernel_map.va_pa_offset)
135 #define kernel_mapping_va_to_pa(y) ({ \
136 unsigned long _y = y; \
137 (IS_ENABLED(CONFIG_XIP_KERNEL) && _y < kernel_map.virt_addr + XIP_OFFSET) ? \
138 ((unsigned long)(_y) - kernel_map.va_kernel_xip_pa_offset) : \
139 ((unsigned long)(_y) - kernel_map.va_kernel_pa_offset - XIP_OFFSET); \
142 #define __va_to_pa_nodebug(x) ({ \
143 unsigned long _x = x; \
144 is_linear_mapping(_x) ? \
145 linear_mapping_va_to_pa(_x) : kernel_mapping_va_to_pa(_x); \
148 #ifdef CONFIG_DEBUG_VIRTUAL
149 extern phys_addr_t __virt_to_phys(unsigned long x);
150 extern phys_addr_t __phys_addr_symbol(unsigned long x);
152 #define __virt_to_phys(x) __va_to_pa_nodebug(x)
153 #define __phys_addr_symbol(x) __va_to_pa_nodebug(x)
154 #endif /* CONFIG_DEBUG_VIRTUAL */
156 #define __pa_symbol(x) __phys_addr_symbol(RELOC_HIDE((unsigned long)(x), 0))
157 #define __pa(x) __virt_to_phys((unsigned long)(x))
158 #define __va(x) ((void *)__pa_to_va_nodebug((phys_addr_t)(x)))
160 #define phys_to_pfn(phys) (PFN_DOWN(phys))
161 #define pfn_to_phys(pfn) (PFN_PHYS(pfn))
163 #define virt_to_pfn(vaddr) (phys_to_pfn(__pa(vaddr)))
164 #define pfn_to_virt(pfn) (__va(pfn_to_phys(pfn)))
166 #define virt_to_page(vaddr) (pfn_to_page(virt_to_pfn(vaddr)))
167 #define page_to_virt(page) (pfn_to_virt(page_to_pfn(page)))
169 #define page_to_phys(page) (pfn_to_phys(page_to_pfn(page)))
170 #define page_to_bus(page) (page_to_phys(page))
171 #define phys_to_page(paddr) (pfn_to_page(phys_to_pfn(paddr)))
173 #define sym_to_pfn(x) __phys_to_pfn(__pa_symbol(x))
175 #ifdef CONFIG_FLATMEM
176 #define pfn_valid(pfn) \
177 (((pfn) >= ARCH_PFN_OFFSET) && (((pfn) - ARCH_PFN_OFFSET) < max_mapnr))
180 #endif /* __ASSEMBLY__ */
182 #define virt_addr_valid(vaddr) ({ \
183 unsigned long _addr = (unsigned long)vaddr; \
184 (unsigned long)(_addr) >= PAGE_OFFSET && pfn_valid(virt_to_pfn(_addr)); \
187 #define VM_DATA_DEFAULT_FLAGS VM_DATA_FLAGS_NON_EXEC
189 #include <asm-generic/memory_model.h>
190 #include <asm-generic/getorder.h>
192 #endif /* _ASM_RISCV_PAGE_H */