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Linux kernel mirror (for testing)
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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
48void 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 */
63typedef struct {
64 unsigned long pgd;
65} pgd_t;
66
67/* Page Table entry */
68typedef struct {
69 unsigned long pte;
70} pte_t;
71
72typedef struct {
73 unsigned long pgprot;
74} pgprot_t;
75
76typedef 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
106struct 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#ifdef CONFIG_XIP_KERNEL
116 unsigned long va_kernel_xip_text_pa_offset;
117 unsigned long va_kernel_xip_data_pa_offset;
118 uintptr_t xiprom;
119 uintptr_t xiprom_sz;
120#else
121 unsigned long va_kernel_pa_offset;
122#endif
123};
124
125extern struct kernel_mapping kernel_map;
126extern phys_addr_t phys_ram_base;
127
128#define is_kernel_mapping(x) \
129 ((x) >= kernel_map.virt_addr && (x) < (kernel_map.virt_addr + kernel_map.size))
130
131#define is_linear_mapping(x) \
132 ((x) >= PAGE_OFFSET && (!IS_ENABLED(CONFIG_64BIT) || (x) < PAGE_OFFSET + KERN_VIRT_SIZE))
133
134#ifndef CONFIG_DEBUG_VIRTUAL
135#define linear_mapping_pa_to_va(x) ((void *)((unsigned long)(x) + kernel_map.va_pa_offset))
136#else
137void *linear_mapping_pa_to_va(unsigned long x);
138#endif
139
140#ifdef CONFIG_XIP_KERNEL
141#define kernel_mapping_pa_to_va(y) ({ \
142 unsigned long _y = (unsigned long)(y); \
143 (_y < phys_ram_base) ? \
144 (void *)(_y + kernel_map.va_kernel_xip_text_pa_offset) : \
145 (void *)(_y + kernel_map.va_kernel_xip_data_pa_offset); \
146 })
147#else
148#define kernel_mapping_pa_to_va(y) ((void *)((unsigned long)(y) + kernel_map.va_kernel_pa_offset))
149#endif
150
151#define __pa_to_va_nodebug(x) linear_mapping_pa_to_va(x)
152
153#ifndef CONFIG_DEBUG_VIRTUAL
154#define linear_mapping_va_to_pa(x) ((unsigned long)(x) - kernel_map.va_pa_offset)
155#else
156phys_addr_t linear_mapping_va_to_pa(unsigned long x);
157#endif
158
159#ifdef CONFIG_XIP_KERNEL
160#define kernel_mapping_va_to_pa(y) ({ \
161 unsigned long _y = (unsigned long)(y); \
162 (_y < kernel_map.virt_addr + kernel_map.xiprom_sz) ? \
163 (_y - kernel_map.va_kernel_xip_text_pa_offset) : \
164 (_y - kernel_map.va_kernel_xip_data_pa_offset); \
165 })
166#else
167#define kernel_mapping_va_to_pa(y) ((unsigned long)(y) - kernel_map.va_kernel_pa_offset)
168#endif
169
170#define __va_to_pa_nodebug(x) ({ \
171 unsigned long _x = x; \
172 is_linear_mapping(_x) ? \
173 linear_mapping_va_to_pa(_x) : kernel_mapping_va_to_pa(_x); \
174 })
175
176#ifdef CONFIG_DEBUG_VIRTUAL
177extern phys_addr_t __virt_to_phys(unsigned long x);
178extern phys_addr_t __phys_addr_symbol(unsigned long x);
179#else
180#define __virt_to_phys(x) __va_to_pa_nodebug(x)
181#define __phys_addr_symbol(x) __va_to_pa_nodebug(x)
182#endif /* CONFIG_DEBUG_VIRTUAL */
183
184#define __pa_symbol(x) __phys_addr_symbol(RELOC_HIDE((unsigned long)(x), 0))
185#define __pa(x) __virt_to_phys((unsigned long)(x))
186#define __va(x) ((void *)__pa_to_va_nodebug((phys_addr_t)(x)))
187
188#define phys_to_pfn(phys) (PFN_DOWN(phys))
189#define pfn_to_phys(pfn) (PFN_PHYS(pfn))
190
191#define virt_to_pfn(vaddr) (phys_to_pfn(__pa(vaddr)))
192#define pfn_to_virt(pfn) (__va(pfn_to_phys(pfn)))
193
194#define virt_to_page(vaddr) (pfn_to_page(virt_to_pfn(vaddr)))
195#define page_to_virt(page) (pfn_to_virt(page_to_pfn(page)))
196
197#define page_to_phys(page) (pfn_to_phys(page_to_pfn(page)))
198#define phys_to_page(paddr) (pfn_to_page(phys_to_pfn(paddr)))
199
200#define sym_to_pfn(x) __phys_to_pfn(__pa_symbol(x))
201
202unsigned long kaslr_offset(void);
203
204static __always_inline void *pfn_to_kaddr(unsigned long pfn)
205{
206 return __va(pfn << PAGE_SHIFT);
207}
208
209#endif /* __ASSEMBLY__ */
210
211#define virt_addr_valid(vaddr) ({ \
212 unsigned long _addr = (unsigned long)vaddr; \
213 (unsigned long)(_addr) >= PAGE_OFFSET && pfn_valid(virt_to_pfn(_addr)); \
214})
215
216#define VM_DATA_DEFAULT_FLAGS VM_DATA_FLAGS_NON_EXEC
217
218#include <asm-generic/memory_model.h>
219#include <asm-generic/getorder.h>
220
221#endif /* _ASM_RISCV_PAGE_H */