xref: /openbmc/linux/arch/riscv/include/asm/page.h (revision b008e327)
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	(12)
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(0xffffffd800000000, 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
48 void 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 */
63 typedef struct {
64 	unsigned long pgd;
65 } pgd_t;
66 
67 /* Page Table entry */
68 typedef struct {
69 	unsigned long pte;
70 } pte_t;
71 
72 typedef struct {
73 	unsigned long pgprot;
74 } pgprot_t;
75 
76 typedef 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 
106 struct 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 	unsigned long va_kernel_pa_offset;
116 	unsigned long va_kernel_xip_pa_offset;
117 #ifdef CONFIG_XIP_KERNEL
118 	uintptr_t xiprom;
119 	uintptr_t xiprom_sz;
120 #endif
121 };
122 
123 extern struct kernel_mapping kernel_map;
124 extern phys_addr_t phys_ram_base;
125 
126 #define is_kernel_mapping(x)	\
127 	((x) >= kernel_map.virt_addr && (x) < (kernel_map.virt_addr + kernel_map.size))
128 
129 #define is_linear_mapping(x)	\
130 	((x) >= PAGE_OFFSET && (!IS_ENABLED(CONFIG_64BIT) || (x) < PAGE_OFFSET + KERN_VIRT_SIZE))
131 
132 #ifndef CONFIG_DEBUG_VIRTUAL
133 #define linear_mapping_pa_to_va(x)	((void *)((unsigned long)(x) + kernel_map.va_pa_offset))
134 #else
135 void *linear_mapping_pa_to_va(unsigned long x);
136 #endif
137 #define kernel_mapping_pa_to_va(y)	({					\
138 	unsigned long _y = (unsigned long)(y);					\
139 	(IS_ENABLED(CONFIG_XIP_KERNEL) && _y < phys_ram_base) ?			\
140 		(void *)(_y + kernel_map.va_kernel_xip_pa_offset) :		\
141 		(void *)(_y + kernel_map.va_kernel_pa_offset + XIP_OFFSET);	\
142 	})
143 #define __pa_to_va_nodebug(x)		linear_mapping_pa_to_va(x)
144 
145 #ifndef CONFIG_DEBUG_VIRTUAL
146 #define linear_mapping_va_to_pa(x)	((unsigned long)(x) - kernel_map.va_pa_offset)
147 #else
148 phys_addr_t linear_mapping_va_to_pa(unsigned long x);
149 #endif
150 #define kernel_mapping_va_to_pa(y) ({						\
151 	unsigned long _y = (unsigned long)(y);					\
152 	(IS_ENABLED(CONFIG_XIP_KERNEL) && _y < kernel_map.virt_addr + XIP_OFFSET) ? \
153 		(_y - kernel_map.va_kernel_xip_pa_offset) :			\
154 		(_y - kernel_map.va_kernel_pa_offset - XIP_OFFSET);		\
155 	})
156 
157 #define __va_to_pa_nodebug(x)	({						\
158 	unsigned long _x = x;							\
159 	is_linear_mapping(_x) ?							\
160 		linear_mapping_va_to_pa(_x) : kernel_mapping_va_to_pa(_x);	\
161 	})
162 
163 #ifdef CONFIG_DEBUG_VIRTUAL
164 extern phys_addr_t __virt_to_phys(unsigned long x);
165 extern phys_addr_t __phys_addr_symbol(unsigned long x);
166 #else
167 #define __virt_to_phys(x)	__va_to_pa_nodebug(x)
168 #define __phys_addr_symbol(x)	__va_to_pa_nodebug(x)
169 #endif /* CONFIG_DEBUG_VIRTUAL */
170 
171 #define __pa_symbol(x)	__phys_addr_symbol(RELOC_HIDE((unsigned long)(x), 0))
172 #define __pa(x)		__virt_to_phys((unsigned long)(x))
173 #define __va(x)		((void *)__pa_to_va_nodebug((phys_addr_t)(x)))
174 
175 #define phys_to_pfn(phys)	(PFN_DOWN(phys))
176 #define pfn_to_phys(pfn)	(PFN_PHYS(pfn))
177 
178 #define virt_to_pfn(vaddr)	(phys_to_pfn(__pa(vaddr)))
179 #define pfn_to_virt(pfn)	(__va(pfn_to_phys(pfn)))
180 
181 #define virt_to_page(vaddr)	(pfn_to_page(virt_to_pfn(vaddr)))
182 #define page_to_virt(page)	(pfn_to_virt(page_to_pfn(page)))
183 
184 #define page_to_phys(page)	(pfn_to_phys(page_to_pfn(page)))
185 #define phys_to_page(paddr)	(pfn_to_page(phys_to_pfn(paddr)))
186 
187 #define sym_to_pfn(x)           __phys_to_pfn(__pa_symbol(x))
188 
189 unsigned long kaslr_offset(void);
190 
191 #endif /* __ASSEMBLY__ */
192 
193 #define virt_addr_valid(vaddr)	({						\
194 	unsigned long _addr = (unsigned long)vaddr;				\
195 	(unsigned long)(_addr) >= PAGE_OFFSET && pfn_valid(virt_to_pfn(_addr));	\
196 })
197 
198 #define VM_DATA_DEFAULT_FLAGS	VM_DATA_FLAGS_NON_EXEC
199 
200 #include <asm-generic/memory_model.h>
201 #include <asm-generic/getorder.h>
202 
203 #endif /* _ASM_RISCV_PAGE_H */
204