Linux kernel mirror (for testing)
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linux
1/*
2 * Based on arch/arm/include/asm/memory.h
3 *
4 * Copyright (C) 2000-2002 Russell King
5 * Copyright (C) 2012 ARM Ltd.
6 *
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.
10 *
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.
15 *
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/>.
18 *
19 * Note: this file should not be included by non-asm/.h files
20 */
21#ifndef __ASM_MEMORY_H
22#define __ASM_MEMORY_H
23
24#include <linux/compiler.h>
25#include <linux/const.h>
26#include <linux/types.h>
27#include <asm/sizes.h>
28
29/*
30 * Allow for constants defined here to be used from assembly code
31 * by prepending the UL suffix only with actual C code compilation.
32 */
33#define UL(x) _AC(x, UL)
34
35/*
36 * Size of the PCI I/O space. This must remain a power of two so that
37 * IO_SPACE_LIMIT acts as a mask for the low bits of I/O addresses.
38 */
39#define PCI_IO_SIZE SZ_16M
40
41/*
42 * PAGE_OFFSET - the virtual address of the start of the kernel image (top
43 * (VA_BITS - 1))
44 * VA_BITS - the maximum number of bits for virtual addresses.
45 * VA_START - the first kernel virtual address.
46 * TASK_SIZE - the maximum size of a user space task.
47 * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area.
48 * The module space lives between the addresses given by TASK_SIZE
49 * and PAGE_OFFSET - it must be within 128MB of the kernel text.
50 */
51#define VA_BITS (CONFIG_ARM64_VA_BITS)
52#define VA_START (UL(0xffffffffffffffff) << VA_BITS)
53#define PAGE_OFFSET (UL(0xffffffffffffffff) << (VA_BITS - 1))
54#define MODULES_END (PAGE_OFFSET)
55#define MODULES_VADDR (MODULES_END - SZ_64M)
56#define PCI_IO_END (MODULES_VADDR - SZ_2M)
57#define PCI_IO_START (PCI_IO_END - PCI_IO_SIZE)
58#define FIXADDR_TOP (PCI_IO_START - SZ_2M)
59#define TASK_SIZE_64 (UL(1) << VA_BITS)
60
61#ifdef CONFIG_COMPAT
62#define TASK_SIZE_32 UL(0x100000000)
63#define TASK_SIZE (test_thread_flag(TIF_32BIT) ? \
64 TASK_SIZE_32 : TASK_SIZE_64)
65#define TASK_SIZE_OF(tsk) (test_tsk_thread_flag(tsk, TIF_32BIT) ? \
66 TASK_SIZE_32 : TASK_SIZE_64)
67#else
68#define TASK_SIZE TASK_SIZE_64
69#endif /* CONFIG_COMPAT */
70
71#define TASK_UNMAPPED_BASE (PAGE_ALIGN(TASK_SIZE / 4))
72
73/*
74 * Physical vs virtual RAM address space conversion. These are
75 * private definitions which should NOT be used outside memory.h
76 * files. Use virt_to_phys/phys_to_virt/__pa/__va instead.
77 */
78#define __virt_to_phys(x) (((phys_addr_t)(x) - PAGE_OFFSET + PHYS_OFFSET))
79#define __phys_to_virt(x) ((unsigned long)((x) - PHYS_OFFSET + PAGE_OFFSET))
80
81/*
82 * Convert a page to/from a physical address
83 */
84#define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page)))
85#define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys)))
86
87/*
88 * Memory types available.
89 */
90#define MT_DEVICE_nGnRnE 0
91#define MT_DEVICE_nGnRE 1
92#define MT_DEVICE_GRE 2
93#define MT_NORMAL_NC 3
94#define MT_NORMAL 4
95#define MT_NORMAL_WT 5
96
97/*
98 * Memory types for Stage-2 translation
99 */
100#define MT_S2_NORMAL 0xf
101#define MT_S2_DEVICE_nGnRE 0x1
102
103#ifndef __ASSEMBLY__
104
105extern phys_addr_t memstart_addr;
106/* PHYS_OFFSET - the physical address of the start of memory. */
107#define PHYS_OFFSET ({ memstart_addr; })
108
109/*
110 * The maximum physical address that the linear direct mapping
111 * of system RAM can cover. (PAGE_OFFSET can be interpreted as
112 * a 2's complement signed quantity and negated to derive the
113 * maximum size of the linear mapping.)
114 */
115#define MAX_MEMBLOCK_ADDR ({ memstart_addr - PAGE_OFFSET - 1; })
116
117/*
118 * PFNs are used to describe any physical page; this means
119 * PFN 0 == physical address 0.
120 *
121 * This is the PFN of the first RAM page in the kernel
122 * direct-mapped view. We assume this is the first page
123 * of RAM in the mem_map as well.
124 */
125#define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT)
126
127/*
128 * Note: Drivers should NOT use these. They are the wrong
129 * translation for translating DMA addresses. Use the driver
130 * DMA support - see dma-mapping.h.
131 */
132#define virt_to_phys virt_to_phys
133static inline phys_addr_t virt_to_phys(const volatile void *x)
134{
135 return __virt_to_phys((unsigned long)(x));
136}
137
138#define phys_to_virt phys_to_virt
139static inline void *phys_to_virt(phys_addr_t x)
140{
141 return (void *)(__phys_to_virt(x));
142}
143
144/*
145 * Drivers should NOT use these either.
146 */
147#define __pa(x) __virt_to_phys((unsigned long)(x))
148#define __va(x) ((void *)__phys_to_virt((phys_addr_t)(x)))
149#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
150#define virt_to_pfn(x) __phys_to_pfn(__virt_to_phys(x))
151
152/*
153 * virt_to_page(k) convert a _valid_ virtual address to struct page *
154 * virt_addr_valid(k) indicates whether a virtual address is valid
155 */
156#define ARCH_PFN_OFFSET ((unsigned long)PHYS_PFN_OFFSET)
157
158#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
159#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
160
161#endif
162
163#include <asm-generic/memory_model.h>
164
165#endif