page.h

  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 */