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/page-def.h>
29 #include <asm/sizes.h>
32 * Size of the PCI I/O space. This must remain a power of two so that
33 * IO_SPACE_LIMIT acts as a mask for the low bits of I/O addresses.
35 #define PCI_IO_SIZE SZ_16M
38 * Log2 of the upper bound of the size of a struct page. Used for sizing
39 * the vmemmap region only, does not affect actual memory footprint.
40 * We don't use sizeof(struct page) directly since taking its size here
41 * requires its definition to be available at this point in the inclusion
42 * chain, and it may not be a power of 2 in the first place.
44 #define STRUCT_PAGE_MAX_SHIFT 6
47 * VMEMMAP_SIZE - allows the whole linear region to be covered by
50 #define VMEMMAP_SIZE (UL(1) << (VA_BITS - PAGE_SHIFT - 1 + STRUCT_PAGE_MAX_SHIFT))
53 * PAGE_OFFSET - the virtual address of the start of the linear map (top
55 * KIMAGE_VADDR - the virtual address of the start of the kernel image
56 * VA_BITS - the maximum number of bits for virtual addresses.
57 * VA_START - the first kernel virtual address.
59 #define VA_BITS (CONFIG_ARM64_VA_BITS)
60 #define VA_START (UL(0xffffffffffffffff) - \
61 (UL(1) << VA_BITS) + 1)
62 #define PAGE_OFFSET (UL(0xffffffffffffffff) - \
63 (UL(1) << (VA_BITS - 1)) + 1)
64 #define KIMAGE_VADDR (MODULES_END)
65 #define MODULES_END (MODULES_VADDR + MODULES_VSIZE)
66 #define MODULES_VADDR (VA_START + KASAN_SHADOW_SIZE)
67 #define MODULES_VSIZE (SZ_128M)
68 #define VMEMMAP_START (PAGE_OFFSET - VMEMMAP_SIZE)
69 #define PCI_IO_END (VMEMMAP_START - SZ_2M)
70 #define PCI_IO_START (PCI_IO_END - PCI_IO_SIZE)
71 #define FIXADDR_TOP (PCI_IO_START - SZ_2M)
73 #define KERNEL_START _text
74 #define KERNEL_END _end
76 #ifdef CONFIG_ARM64_USER_VA_BITS_52
77 #define MAX_USER_VA_BITS 52
79 #define MAX_USER_VA_BITS VA_BITS
83 * KASAN requires 1/8th of the kernel virtual address space for the shadow
84 * region. KASAN can bloat the stack significantly, so double the (minimum)
85 * stack size when KASAN is in use, and then double it again if KASAN_EXTRA is
89 #define KASAN_SHADOW_SCALE_SHIFT 3
90 #define KASAN_SHADOW_SIZE (UL(1) << (VA_BITS - KASAN_SHADOW_SCALE_SHIFT))
91 #ifdef CONFIG_KASAN_EXTRA
92 #define KASAN_THREAD_SHIFT 2
94 #define KASAN_THREAD_SHIFT 1
95 #endif /* CONFIG_KASAN_EXTRA */
97 #define KASAN_SHADOW_SIZE (0)
98 #define KASAN_THREAD_SHIFT 0
101 #define MIN_THREAD_SHIFT (14 + KASAN_THREAD_SHIFT)
104 * VMAP'd stacks are allocated at page granularity, so we must ensure that such
105 * stacks are a multiple of page size.
107 #if defined(CONFIG_VMAP_STACK) && (MIN_THREAD_SHIFT < PAGE_SHIFT)
108 #define THREAD_SHIFT PAGE_SHIFT
110 #define THREAD_SHIFT MIN_THREAD_SHIFT
113 #if THREAD_SHIFT >= PAGE_SHIFT
114 #define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT)
117 #define THREAD_SIZE (UL(1) << THREAD_SHIFT)
120 * By aligning VMAP'd stacks to 2 * THREAD_SIZE, we can detect overflow by
121 * checking sp & (1 << THREAD_SHIFT), which we can do cheaply in the entry
124 #ifdef CONFIG_VMAP_STACK
125 #define THREAD_ALIGN (2 * THREAD_SIZE)
127 #define THREAD_ALIGN THREAD_SIZE
130 #define IRQ_STACK_SIZE THREAD_SIZE
132 #define OVERFLOW_STACK_SIZE SZ_4K
135 * Alignment of kernel segments (e.g. .text, .data).
137 #if defined(CONFIG_DEBUG_ALIGN_RODATA)
139 * 4 KB granule: 1 level 2 entry
140 * 16 KB granule: 128 level 3 entries, with contiguous bit
141 * 64 KB granule: 32 level 3 entries, with contiguous bit
143 #define SEGMENT_ALIGN SZ_2M
146 * 4 KB granule: 16 level 3 entries, with contiguous bit
147 * 16 KB granule: 4 level 3 entries, without contiguous bit
148 * 64 KB granule: 1 level 3 entry
150 #define SEGMENT_ALIGN SZ_64K
154 * Memory types available.
156 #define MT_DEVICE_nGnRnE 0
157 #define MT_DEVICE_nGnRE 1
158 #define MT_DEVICE_GRE 2
159 #define MT_NORMAL_NC 3
161 #define MT_NORMAL_WT 5
164 * Memory types for Stage-2 translation
166 #define MT_S2_NORMAL 0xf
167 #define MT_S2_DEVICE_nGnRE 0x1
170 * Memory types for Stage-2 translation when ID_AA64MMFR2_EL1.FWB is 0001
171 * Stage-2 enforces Normal-WB and Device-nGnRE
173 #define MT_S2_FWB_NORMAL 6
174 #define MT_S2_FWB_DEVICE_nGnRE 1
176 #ifdef CONFIG_ARM64_4K_PAGES
177 #define IOREMAP_MAX_ORDER (PUD_SHIFT)
179 #define IOREMAP_MAX_ORDER (PMD_SHIFT)
182 #ifdef CONFIG_BLK_DEV_INITRD
183 #define __early_init_dt_declare_initrd(__start, __end) \
185 initrd_start = (__start); \
186 initrd_end = (__end); \
192 #include <linux/bitops.h>
193 #include <linux/mmdebug.h>
195 extern s64 memstart_addr;
196 /* PHYS_OFFSET - the physical address of the start of memory. */
197 #define PHYS_OFFSET ({ VM_BUG_ON(memstart_addr & 1); memstart_addr; })
199 /* the virtual base of the kernel image (minus TEXT_OFFSET) */
200 extern u64 kimage_vaddr;
202 /* the offset between the kernel virtual and physical mappings */
203 extern u64 kimage_voffset;
205 static inline unsigned long kaslr_offset(void)
207 return kimage_vaddr - KIMAGE_VADDR;
211 * Allow all memory at the discovery stage. We will clip it later.
213 #define MIN_MEMBLOCK_ADDR 0
214 #define MAX_MEMBLOCK_ADDR U64_MAX
217 * PFNs are used to describe any physical page; this means
218 * PFN 0 == physical address 0.
220 * This is the PFN of the first RAM page in the kernel
221 * direct-mapped view. We assume this is the first page
222 * of RAM in the mem_map as well.
224 #define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT)
227 * Physical vs virtual RAM address space conversion. These are
228 * private definitions which should NOT be used outside memory.h
229 * files. Use virt_to_phys/phys_to_virt/__pa/__va instead.
234 * The linear kernel range starts in the middle of the virtual adddress
235 * space. Testing the top bit for the start of the region is a
238 #define __is_lm_address(addr) (!!((addr) & BIT(VA_BITS - 1)))
240 #define __lm_to_phys(addr) (((addr) & ~PAGE_OFFSET) + PHYS_OFFSET)
241 #define __kimg_to_phys(addr) ((addr) - kimage_voffset)
243 #define __virt_to_phys_nodebug(x) ({ \
244 phys_addr_t __x = (phys_addr_t)(x); \
245 __is_lm_address(__x) ? __lm_to_phys(__x) : \
246 __kimg_to_phys(__x); \
249 #define __pa_symbol_nodebug(x) __kimg_to_phys((phys_addr_t)(x))
251 #ifdef CONFIG_DEBUG_VIRTUAL
252 extern phys_addr_t __virt_to_phys(unsigned long x);
253 extern phys_addr_t __phys_addr_symbol(unsigned long x);
255 #define __virt_to_phys(x) __virt_to_phys_nodebug(x)
256 #define __phys_addr_symbol(x) __pa_symbol_nodebug(x)
259 #define __phys_to_virt(x) ((unsigned long)((x) - PHYS_OFFSET) | PAGE_OFFSET)
260 #define __phys_to_kimg(x) ((unsigned long)((x) + kimage_voffset))
263 * Convert a page to/from a physical address
265 #define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page)))
266 #define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys)))
269 * Note: Drivers should NOT use these. They are the wrong
270 * translation for translating DMA addresses. Use the driver
271 * DMA support - see dma-mapping.h.
273 #define virt_to_phys virt_to_phys
274 static inline phys_addr_t virt_to_phys(const volatile void *x)
276 return __virt_to_phys((unsigned long)(x));
279 #define phys_to_virt phys_to_virt
280 static inline void *phys_to_virt(phys_addr_t x)
282 return (void *)(__phys_to_virt(x));
286 * Drivers should NOT use these either.
288 #define __pa(x) __virt_to_phys((unsigned long)(x))
289 #define __pa_symbol(x) __phys_addr_symbol(RELOC_HIDE((unsigned long)(x), 0))
290 #define __pa_nodebug(x) __virt_to_phys_nodebug((unsigned long)(x))
291 #define __va(x) ((void *)__phys_to_virt((phys_addr_t)(x)))
292 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
293 #define virt_to_pfn(x) __phys_to_pfn(__virt_to_phys((unsigned long)(x)))
294 #define sym_to_pfn(x) __phys_to_pfn(__pa_symbol(x))
297 * virt_to_page(k) convert a _valid_ virtual address to struct page *
298 * virt_addr_valid(k) indicates whether a virtual address is valid
300 #define ARCH_PFN_OFFSET ((unsigned long)PHYS_PFN_OFFSET)
302 #ifndef CONFIG_SPARSEMEM_VMEMMAP
303 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
304 #define _virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
306 #define __virt_to_pgoff(kaddr) (((u64)(kaddr) & ~PAGE_OFFSET) / PAGE_SIZE * sizeof(struct page))
307 #define __page_to_voff(kaddr) (((u64)(kaddr) & ~VMEMMAP_START) * PAGE_SIZE / sizeof(struct page))
309 #define page_to_virt(page) ((void *)((__page_to_voff(page)) | PAGE_OFFSET))
310 #define virt_to_page(vaddr) ((struct page *)((__virt_to_pgoff(vaddr)) | VMEMMAP_START))
312 #define _virt_addr_valid(kaddr) pfn_valid((((u64)(kaddr) & ~PAGE_OFFSET) \
313 + PHYS_OFFSET) >> PAGE_SHIFT)
317 #define _virt_addr_is_linear(kaddr) (((u64)(kaddr)) >= PAGE_OFFSET)
318 #define virt_addr_valid(kaddr) (_virt_addr_is_linear(kaddr) && \
319 _virt_addr_valid(kaddr))
321 #include <asm-generic/memory_model.h>