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))
75 * The size of the KASAN shadow region. This should be 1/8th of the
76 * size of the entire kernel virtual address space.
79 #define KASAN_SHADOW_SIZE (UL(1) << (VA_BITS - 3))
81 #define KASAN_SHADOW_SIZE (0)
85 * Physical vs virtual RAM address space conversion. These are
86 * private definitions which should NOT be used outside memory.h
87 * files. Use virt_to_phys/phys_to_virt/__pa/__va instead.
89 #define __virt_to_phys(x) ({ \
90 phys_addr_t __x = (phys_addr_t)(x); \
91 __x & BIT(VA_BITS - 1) ? (__x & ~PAGE_OFFSET) + PHYS_OFFSET : \
92 (__x - kimage_voffset); })
94 #define __phys_to_virt(x) ((unsigned long)((x) - PHYS_OFFSET) | PAGE_OFFSET)
95 #define __phys_to_kimg(x) ((unsigned long)((x) + kimage_voffset))
98 * Convert a page to/from a physical address
100 #define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page)))
101 #define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys)))
104 * Memory types available.
106 #define MT_DEVICE_nGnRnE 0
107 #define MT_DEVICE_nGnRE 1
108 #define MT_DEVICE_GRE 2
109 #define MT_NORMAL_NC 3
111 #define MT_NORMAL_WT 5
114 * Memory types for Stage-2 translation
116 #define MT_S2_NORMAL 0xf
117 #define MT_S2_DEVICE_nGnRE 0x1
119 #ifdef CONFIG_ARM64_4K_PAGES
120 #define IOREMAP_MAX_ORDER (PUD_SHIFT)
122 #define IOREMAP_MAX_ORDER (PMD_SHIFT)
125 #ifdef CONFIG_BLK_DEV_INITRD
126 #define __early_init_dt_declare_initrd(__start, __end) \
128 initrd_start = (__start); \
129 initrd_end = (__end); \
135 #include <linux/bitops.h>
136 #include <linux/mmdebug.h>
138 extern phys_addr_t memstart_addr;
139 /* PHYS_OFFSET - the physical address of the start of memory. */
140 #define PHYS_OFFSET ({ VM_BUG_ON(memstart_addr & 1); memstart_addr; })
142 /* the virtual base of the kernel image (minus TEXT_OFFSET) */
143 extern u64 kimage_vaddr;
145 /* the offset between the kernel virtual and physical mappings */
146 extern u64 kimage_voffset;
149 * Allow all memory at the discovery stage. We will clip it later.
151 #define MIN_MEMBLOCK_ADDR 0
152 #define MAX_MEMBLOCK_ADDR U64_MAX
155 * PFNs are used to describe any physical page; this means
156 * PFN 0 == physical address 0.
158 * This is the PFN of the first RAM page in the kernel
159 * direct-mapped view. We assume this is the first page
160 * of RAM in the mem_map as well.
162 #define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT)
165 * Note: Drivers should NOT use these. They are the wrong
166 * translation for translating DMA addresses. Use the driver
167 * DMA support - see dma-mapping.h.
169 #define virt_to_phys virt_to_phys
170 static inline phys_addr_t virt_to_phys(const volatile void *x)
172 return __virt_to_phys((unsigned long)(x));
175 #define phys_to_virt phys_to_virt
176 static inline void *phys_to_virt(phys_addr_t x)
178 return (void *)(__phys_to_virt(x));
182 * Drivers should NOT use these either.
184 #define __pa(x) __virt_to_phys((unsigned long)(x))
185 #define __va(x) ((void *)__phys_to_virt((phys_addr_t)(x)))
186 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
187 #define virt_to_pfn(x) __phys_to_pfn(__virt_to_phys(x))
190 * virt_to_page(k) convert a _valid_ virtual address to struct page *
191 * virt_addr_valid(k) indicates whether a virtual address is valid
193 #define ARCH_PFN_OFFSET ((unsigned long)PHYS_PFN_OFFSET)
195 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
196 #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
200 #include <asm-generic/memory_model.h>