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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#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#ifdef CONFIG_XIP_KERNEL
33#define PAGE_OFFSET PAGE_OFFSET_L3
34#else
35#define PAGE_OFFSET kernel_map.page_offset
36#endif /* CONFIG_XIP_KERNEL */
37#else
38#define PAGE_OFFSET _AC(0xc0000000, UL)
39#endif /* CONFIG_64BIT */
40#else
41#define PAGE_OFFSET ((unsigned long)phys_ram_base)
42#endif /* CONFIG_MMU */
43
44#ifndef __ASSEMBLER__
45
46#ifdef CONFIG_RISCV_ISA_ZICBOZ
47void clear_page(void *page);
48#else
49#define clear_page(pgaddr) memset((pgaddr), 0, PAGE_SIZE)
50#endif
51#define copy_page(to, from) memcpy((to), (from), PAGE_SIZE)
52
53#define clear_user_page(pgaddr, vaddr, page) clear_page(pgaddr)
54#define copy_user_page(vto, vfrom, vaddr, topg) \
55 memcpy((vto), (vfrom), PAGE_SIZE)
56
57/*
58 * Use struct definitions to apply C type checking
59 */
60
61/* Page Global Directory entry */
62typedef struct {
63 unsigned long pgd;
64} pgd_t;
65
66/* Page Table entry */
67typedef struct {
68 unsigned long pte;
69} pte_t;
70
71typedef struct {
72 unsigned long pgprot;
73} pgprot_t;
74
75typedef struct page *pgtable_t;
76
77#define pte_val(x) ((x).pte)
78#define pgd_val(x) ((x).pgd)
79#define pgprot_val(x) ((x).pgprot)
80
81#define __pte(x) ((pte_t) { (x) })
82#define __pgd(x) ((pgd_t) { (x) })
83#define __pgprot(x) ((pgprot_t) { (x) })
84
85#ifdef CONFIG_64BIT
86#define PTE_FMT "%016lx"
87#else
88#define PTE_FMT "%08lx"
89#endif
90
91#if defined(CONFIG_64BIT) && defined(CONFIG_MMU)
92/*
93 * We override this value as its generic definition uses __pa too early in
94 * the boot process (before kernel_map.va_pa_offset is set).
95 */
96#define MIN_MEMBLOCK_ADDR 0
97#endif
98
99#define ARCH_PFN_OFFSET (PFN_DOWN((unsigned long)phys_ram_base))
100
101struct kernel_mapping {
102 unsigned long virt_addr;
103 unsigned long virt_offset;
104 uintptr_t phys_addr;
105 uintptr_t size;
106 /* Offset between linear mapping virtual address and kernel load address */
107 unsigned long va_pa_offset;
108 /* Offset between kernel mapping virtual address and kernel load address */
109#ifdef CONFIG_XIP_KERNEL
110 unsigned long va_kernel_xip_text_pa_offset;
111 unsigned long va_kernel_xip_data_pa_offset;
112 uintptr_t xiprom;
113 uintptr_t xiprom_sz;
114#else
115 unsigned long page_offset;
116 unsigned long va_kernel_pa_offset;
117#endif
118};
119
120extern struct kernel_mapping kernel_map;
121extern phys_addr_t phys_ram_base;
122extern unsigned long vmemmap_start_pfn;
123
124#define is_kernel_mapping(x) \
125 ((x) >= kernel_map.virt_addr && (x) < (kernel_map.virt_addr + kernel_map.size))
126
127#define is_linear_mapping(x) \
128 ((x) >= PAGE_OFFSET && (!IS_ENABLED(CONFIG_64BIT) || (x) < PAGE_OFFSET + KERN_VIRT_SIZE))
129
130#ifndef CONFIG_DEBUG_VIRTUAL
131#define linear_mapping_pa_to_va(x) ((void *)((unsigned long)(x) + kernel_map.va_pa_offset))
132#else
133void *linear_mapping_pa_to_va(unsigned long x);
134#endif
135
136#ifdef CONFIG_XIP_KERNEL
137#define kernel_mapping_pa_to_va(y) ({ \
138 unsigned long _y = (unsigned long)(y); \
139 (_y < phys_ram_base) ? \
140 (void *)(_y + kernel_map.va_kernel_xip_text_pa_offset) : \
141 (void *)(_y + kernel_map.va_kernel_xip_data_pa_offset); \
142 })
143#else
144#define kernel_mapping_pa_to_va(y) ((void *)((unsigned long)(y) + kernel_map.va_kernel_pa_offset))
145#endif
146
147#define __pa_to_va_nodebug(x) linear_mapping_pa_to_va(x)
148
149#ifndef CONFIG_DEBUG_VIRTUAL
150#define linear_mapping_va_to_pa(x) ((unsigned long)(x) - kernel_map.va_pa_offset)
151#else
152phys_addr_t linear_mapping_va_to_pa(unsigned long x);
153#endif
154
155#ifdef CONFIG_XIP_KERNEL
156#define kernel_mapping_va_to_pa(y) ({ \
157 unsigned long _y = (unsigned long)(y); \
158 (_y < kernel_map.virt_addr + kernel_map.xiprom_sz) ? \
159 (_y - kernel_map.va_kernel_xip_text_pa_offset) : \
160 (_y - kernel_map.va_kernel_xip_data_pa_offset); \
161 })
162#else
163#define kernel_mapping_va_to_pa(y) ((unsigned long)(y) - kernel_map.va_kernel_pa_offset)
164#endif
165
166#define __va_to_pa_nodebug(x) ({ \
167 unsigned long _x = x; \
168 is_linear_mapping(_x) ? \
169 linear_mapping_va_to_pa(_x) : kernel_mapping_va_to_pa(_x); \
170 })
171
172#ifdef CONFIG_DEBUG_VIRTUAL
173extern phys_addr_t __virt_to_phys(unsigned long x);
174extern phys_addr_t __phys_addr_symbol(unsigned long x);
175#else
176#define __virt_to_phys(x) __va_to_pa_nodebug(x)
177#define __phys_addr_symbol(x) __va_to_pa_nodebug(x)
178#endif /* CONFIG_DEBUG_VIRTUAL */
179
180#define __pa_symbol(x) __phys_addr_symbol(RELOC_HIDE((unsigned long)(x), 0))
181#define __pa(x) __virt_to_phys((unsigned long)(x))
182#define __va(x) ((void *)__pa_to_va_nodebug((phys_addr_t)(x)))
183
184#define phys_to_pfn(phys) (PFN_DOWN(phys))
185#define pfn_to_phys(pfn) (PFN_PHYS(pfn))
186
187#define virt_to_pfn(vaddr) (phys_to_pfn(__pa(vaddr)))
188#define pfn_to_virt(pfn) (__va(pfn_to_phys(pfn)))
189
190#define virt_to_page(vaddr) (pfn_to_page(virt_to_pfn(vaddr)))
191#define page_to_virt(page) (pfn_to_virt(page_to_pfn(page)))
192
193#define sym_to_pfn(x) __phys_to_pfn(__pa_symbol(x))
194
195unsigned long kaslr_offset(void);
196
197static __always_inline void *pfn_to_kaddr(unsigned long pfn)
198{
199 return __va(pfn << PAGE_SHIFT);
200}
201
202#endif /* __ASSEMBLER__ */
203
204#define virt_addr_valid(vaddr) ({ \
205 unsigned long _addr = (unsigned long)vaddr; \
206 (unsigned long)(_addr) >= PAGE_OFFSET && pfn_valid(virt_to_pfn(_addr)); \
207})
208
209#define VM_DATA_DEFAULT_FLAGS VM_DATA_FLAGS_NON_EXEC
210
211#include <asm-generic/memory_model.h>
212#include <asm-generic/getorder.h>
213
214#endif /* _ASM_RISCV_PAGE_H */