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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_64BIT
28#ifdef CONFIG_MMU
29#define PAGE_OFFSET kernel_map.page_offset
30#else
31#define PAGE_OFFSET _AC(CONFIG_PAGE_OFFSET, UL)
32#endif
33/*
34 * By default, CONFIG_PAGE_OFFSET value corresponds to SV57 address space so
35 * define the PAGE_OFFSET value for SV48 and SV39.
36 */
37#define PAGE_OFFSET_L4 _AC(0xffffaf8000000000, UL)
38#define PAGE_OFFSET_L3 _AC(0xffffffd600000000, UL)
39#else
40#define PAGE_OFFSET _AC(CONFIG_PAGE_OFFSET, UL)
41#endif /* CONFIG_64BIT */
42
43#ifndef __ASSEMBLY__
44
45#ifdef CONFIG_RISCV_ISA_ZICBOZ
46void clear_page(void *page);
47#else
48#define clear_page(pgaddr) memset((pgaddr), 0, PAGE_SIZE)
49#endif
50#define copy_page(to, from) memcpy((to), (from), PAGE_SIZE)
51
52#define clear_user_page(pgaddr, vaddr, page) clear_page(pgaddr)
53#define copy_user_page(vto, vfrom, vaddr, topg) \
54 memcpy((vto), (vfrom), PAGE_SIZE)
55
56/*
57 * Use struct definitions to apply C type checking
58 */
59
60/* Page Global Directory entry */
61typedef struct {
62 unsigned long pgd;
63} pgd_t;
64
65/* Page Table entry */
66typedef struct {
67 unsigned long pte;
68} pte_t;
69
70typedef struct {
71 unsigned long pgprot;
72} pgprot_t;
73
74typedef struct page *pgtable_t;
75
76#define pte_val(x) ((x).pte)
77#define pgd_val(x) ((x).pgd)
78#define pgprot_val(x) ((x).pgprot)
79
80#define __pte(x) ((pte_t) { (x) })
81#define __pgd(x) ((pgd_t) { (x) })
82#define __pgprot(x) ((pgprot_t) { (x) })
83
84#ifdef CONFIG_64BIT
85#define PTE_FMT "%016lx"
86#else
87#define PTE_FMT "%08lx"
88#endif
89
90#if defined(CONFIG_64BIT) && defined(CONFIG_MMU)
91/*
92 * We override this value as its generic definition uses __pa too early in
93 * the boot process (before kernel_map.va_pa_offset is set).
94 */
95#define MIN_MEMBLOCK_ADDR 0
96#endif
97
98#ifdef CONFIG_MMU
99#define ARCH_PFN_OFFSET (PFN_DOWN((unsigned long)phys_ram_base))
100#else
101#define ARCH_PFN_OFFSET (PAGE_OFFSET >> PAGE_SHIFT)
102#endif /* CONFIG_MMU */
103
104struct kernel_mapping {
105 unsigned long page_offset;
106 unsigned long virt_addr;
107 unsigned long virt_offset;
108 uintptr_t phys_addr;
109 uintptr_t size;
110 /* Offset between linear mapping virtual address and kernel load address */
111 unsigned long va_pa_offset;
112 /* Offset between kernel mapping virtual address and kernel load address */
113#ifdef CONFIG_XIP_KERNEL
114 unsigned long va_kernel_xip_text_pa_offset;
115 unsigned long va_kernel_xip_data_pa_offset;
116 uintptr_t xiprom;
117 uintptr_t xiprom_sz;
118#else
119 unsigned long va_kernel_pa_offset;
120#endif
121};
122
123extern struct kernel_mapping kernel_map;
124extern phys_addr_t phys_ram_base;
125extern unsigned long vmemmap_start_pfn;
126
127#define is_kernel_mapping(x) \
128 ((x) >= kernel_map.virt_addr && (x) < (kernel_map.virt_addr + kernel_map.size))
129
130#define is_linear_mapping(x) \
131 ((x) >= PAGE_OFFSET && (!IS_ENABLED(CONFIG_64BIT) || (x) < PAGE_OFFSET + KERN_VIRT_SIZE))
132
133#ifndef CONFIG_DEBUG_VIRTUAL
134#define linear_mapping_pa_to_va(x) ((void *)((unsigned long)(x) + kernel_map.va_pa_offset))
135#else
136void *linear_mapping_pa_to_va(unsigned long x);
137#endif
138
139#ifdef CONFIG_XIP_KERNEL
140#define kernel_mapping_pa_to_va(y) ({ \
141 unsigned long _y = (unsigned long)(y); \
142 (_y < phys_ram_base) ? \
143 (void *)(_y + kernel_map.va_kernel_xip_text_pa_offset) : \
144 (void *)(_y + kernel_map.va_kernel_xip_data_pa_offset); \
145 })
146#else
147#define kernel_mapping_pa_to_va(y) ((void *)((unsigned long)(y) + kernel_map.va_kernel_pa_offset))
148#endif
149
150#define __pa_to_va_nodebug(x) linear_mapping_pa_to_va(x)
151
152#ifndef CONFIG_DEBUG_VIRTUAL
153#define linear_mapping_va_to_pa(x) ((unsigned long)(x) - kernel_map.va_pa_offset)
154#else
155phys_addr_t linear_mapping_va_to_pa(unsigned long x);
156#endif
157
158#ifdef CONFIG_XIP_KERNEL
159#define kernel_mapping_va_to_pa(y) ({ \
160 unsigned long _y = (unsigned long)(y); \
161 (_y < kernel_map.virt_addr + kernel_map.xiprom_sz) ? \
162 (_y - kernel_map.va_kernel_xip_text_pa_offset) : \
163 (_y - kernel_map.va_kernel_xip_data_pa_offset); \
164 })
165#else
166#define kernel_mapping_va_to_pa(y) ((unsigned long)(y) - kernel_map.va_kernel_pa_offset)
167#endif
168
169#define __va_to_pa_nodebug(x) ({ \
170 unsigned long _x = x; \
171 is_linear_mapping(_x) ? \
172 linear_mapping_va_to_pa(_x) : kernel_mapping_va_to_pa(_x); \
173 })
174
175#ifdef CONFIG_DEBUG_VIRTUAL
176extern phys_addr_t __virt_to_phys(unsigned long x);
177extern phys_addr_t __phys_addr_symbol(unsigned long x);
178#else
179#define __virt_to_phys(x) __va_to_pa_nodebug(x)
180#define __phys_addr_symbol(x) __va_to_pa_nodebug(x)
181#endif /* CONFIG_DEBUG_VIRTUAL */
182
183#define __pa_symbol(x) __phys_addr_symbol(RELOC_HIDE((unsigned long)(x), 0))
184#define __pa(x) __virt_to_phys((unsigned long)(x))
185#define __va(x) ((void *)__pa_to_va_nodebug((phys_addr_t)(x)))
186
187#define phys_to_pfn(phys) (PFN_DOWN(phys))
188#define pfn_to_phys(pfn) (PFN_PHYS(pfn))
189
190#define virt_to_pfn(vaddr) (phys_to_pfn(__pa(vaddr)))
191#define pfn_to_virt(pfn) (__va(pfn_to_phys(pfn)))
192
193#define virt_to_page(vaddr) (pfn_to_page(virt_to_pfn(vaddr)))
194#define page_to_virt(page) (pfn_to_virt(page_to_pfn(page)))
195
196#define sym_to_pfn(x) __phys_to_pfn(__pa_symbol(x))
197
198unsigned long kaslr_offset(void);
199
200static __always_inline void *pfn_to_kaddr(unsigned long pfn)
201{
202 return __va(pfn << PAGE_SHIFT);
203}
204
205#endif /* __ASSEMBLY__ */
206
207#define virt_addr_valid(vaddr) ({ \
208 unsigned long _addr = (unsigned long)vaddr; \
209 (unsigned long)(_addr) >= PAGE_OFFSET && pfn_valid(virt_to_pfn(_addr)); \
210})
211
212#define VM_DATA_DEFAULT_FLAGS VM_DATA_FLAGS_NON_EXEC
213
214#include <asm-generic/memory_model.h>
215#include <asm-generic/getorder.h>
216
217#endif /* _ASM_RISCV_PAGE_H */