2 * Based on arch/arm/include/asm/memory.h
4 * Copyright (C) 2000-2002 Russell King
5 * Copyright (C) 2012 ARM Ltd.
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
19 * Note: this file should not be included by non-asm/.h files
21 #ifndef __ASM_MEMORY_H
22 #define __ASM_MEMORY_H
24 #include <linux/compiler.h>
25 #include <linux/const.h>
26 #include <linux/types.h>
28 #include <asm/sizes.h>
31 * Allow for constants defined here to be used from assembly code
32 * by prepending the UL suffix only with actual C code compilation.
34 #define UL(x) _AC(x, UL)
37 * Size of the PCI I/O space. This must remain a power of two so that
38 * IO_SPACE_LIMIT acts as a mask for the low bits of I/O addresses.
40 #define PCI_IO_SIZE SZ_16M
43 * PAGE_OFFSET - the virtual address of the start of the kernel image (top
45 * VA_BITS - the maximum number of bits for virtual addresses.
46 * VA_START - the first kernel virtual address.
47 * TASK_SIZE - the maximum size of a user space task.
48 * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area.
50 #define VA_BITS (CONFIG_ARM64_VA_BITS)
51 #define VA_START (UL(0xffffffffffffffff) << VA_BITS)
52 #define PAGE_OFFSET (UL(0xffffffffffffffff) << (VA_BITS - 1))
53 #define KIMAGE_VADDR (MODULES_END)
54 #define MODULES_END (MODULES_VADDR + MODULES_VSIZE)
55 #define MODULES_VADDR (VA_START + KASAN_SHADOW_SIZE)
56 #define MODULES_VSIZE (SZ_128M)
57 #define PCI_IO_END (PAGE_OFFSET - SZ_2M)
58 #define PCI_IO_START (PCI_IO_END - PCI_IO_SIZE)
59 #define FIXADDR_TOP (PCI_IO_START - SZ_2M)
60 #define TASK_SIZE_64 (UL(1) << VA_BITS)
63 #define TASK_SIZE_32 UL(0x100000000)
64 #define TASK_SIZE (test_thread_flag(TIF_32BIT) ? \
65 TASK_SIZE_32 : TASK_SIZE_64)
66 #define TASK_SIZE_OF(tsk) (test_tsk_thread_flag(tsk, TIF_32BIT) ? \
67 TASK_SIZE_32 : TASK_SIZE_64)
69 #define TASK_SIZE TASK_SIZE_64
70 #endif /* CONFIG_COMPAT */
72 #define TASK_UNMAPPED_BASE (PAGE_ALIGN(TASK_SIZE / 4))
74 #define KERNEL_START _text
75 #define KERNEL_END _end
78 * The size of the KASAN shadow region. This should be 1/8th of the
79 * size of the entire kernel virtual address space.
82 #define KASAN_SHADOW_SIZE (UL(1) << (VA_BITS - 3))
84 #define KASAN_SHADOW_SIZE (0)
88 * Physical vs virtual RAM address space conversion. These are
89 * private definitions which should NOT be used outside memory.h
90 * files. Use virt_to_phys/phys_to_virt/__pa/__va instead.
92 #define __virt_to_phys(x) ({ \
93 phys_addr_t __x = (phys_addr_t)(x); \
94 __x & BIT(VA_BITS - 1) ? (__x & ~PAGE_OFFSET) + PHYS_OFFSET : \
95 (__x - kimage_voffset); })
97 #define __phys_to_virt(x) ((unsigned long)((x) - PHYS_OFFSET) | PAGE_OFFSET)
98 #define __phys_to_kimg(x) ((unsigned long)((x) + kimage_voffset))
101 * Convert a page to/from a physical address
103 #define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page)))
104 #define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys)))
107 * Memory types available.
109 #define MT_DEVICE_nGnRnE 0
110 #define MT_DEVICE_nGnRE 1
111 #define MT_DEVICE_GRE 2
112 #define MT_NORMAL_NC 3
114 #define MT_NORMAL_WT 5
117 * Memory types for Stage-2 translation
119 #define MT_S2_NORMAL 0xf
120 #define MT_S2_DEVICE_nGnRE 0x1
122 #ifdef CONFIG_ARM64_4K_PAGES
123 #define IOREMAP_MAX_ORDER (PUD_SHIFT)
125 #define IOREMAP_MAX_ORDER (PMD_SHIFT)
128 #ifdef CONFIG_BLK_DEV_INITRD
129 #define __early_init_dt_declare_initrd(__start, __end) \
131 initrd_start = (__start); \
132 initrd_end = (__end); \
138 #include <linux/bitops.h>
139 #include <linux/mmdebug.h>
141 extern s64 memstart_addr;
142 /* PHYS_OFFSET - the physical address of the start of memory. */
143 #define PHYS_OFFSET ({ VM_BUG_ON(memstart_addr & 1); memstart_addr; })
145 /* the virtual base of the kernel image (minus TEXT_OFFSET) */
146 extern u64 kimage_vaddr;
148 /* the offset between the kernel virtual and physical mappings */
149 extern u64 kimage_voffset;
152 * Allow all memory at the discovery stage. We will clip it later.
154 #define MIN_MEMBLOCK_ADDR 0
155 #define MAX_MEMBLOCK_ADDR U64_MAX
158 * PFNs are used to describe any physical page; this means
159 * PFN 0 == physical address 0.
161 * This is the PFN of the first RAM page in the kernel
162 * direct-mapped view. We assume this is the first page
163 * of RAM in the mem_map as well.
165 #define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT)
168 * Note: Drivers should NOT use these. They are the wrong
169 * translation for translating DMA addresses. Use the driver
170 * DMA support - see dma-mapping.h.
172 #define virt_to_phys virt_to_phys
173 static inline phys_addr_t virt_to_phys(const volatile void *x)
175 return __virt_to_phys((unsigned long)(x));
178 #define phys_to_virt phys_to_virt
179 static inline void *phys_to_virt(phys_addr_t x)
181 return (void *)(__phys_to_virt(x));
185 * Drivers should NOT use these either.
187 #define __pa(x) __virt_to_phys((unsigned long)(x))
188 #define __va(x) ((void *)__phys_to_virt((phys_addr_t)(x)))
189 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
190 #define virt_to_pfn(x) __phys_to_pfn(__virt_to_phys(x))
193 * virt_to_page(k) convert a _valid_ virtual address to struct page *
194 * virt_addr_valid(k) indicates whether a virtual address is valid
196 #define ARCH_PFN_OFFSET ((unsigned long)PHYS_PFN_OFFSET)
198 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
199 #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
203 #include <asm-generic/memory_model.h>