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/bug.h>
28 #include <asm/page-def.h>
29 #include <asm/sizes.h>
30
31 /*
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.
34 */
35 #define PCI_IO_SIZE SZ_16M
36
37 /*
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.
43 */
44 #define STRUCT_PAGE_MAX_SHIFT 6
45
46 /*
47 * VMEMMAP_SIZE - allows the whole linear region to be covered by
48 * a struct page array
49 */
50 #define VMEMMAP_SIZE (UL(1) << (VA_BITS - PAGE_SHIFT - 1 + STRUCT_PAGE_MAX_SHIFT))
51
52 /*
53 * PAGE_OFFSET - the virtual address of the start of the linear map (top
54 * (VA_BITS - 1))
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.
58 */
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)
72
73 #define KERNEL_START _text
74 #define KERNEL_END _end
75
76 /*
77 * KASAN requires 1/8th of the kernel virtual address space for the shadow
78 * region. KASAN can bloat the stack significantly, so double the (minimum)
79 * stack size when KASAN is in use.
80 */
81 #ifdef CONFIG_KASAN
82 #define KASAN_SHADOW_SCALE_SHIFT 3
83 #define KASAN_SHADOW_SIZE (UL(1) << (VA_BITS - KASAN_SHADOW_SCALE_SHIFT))
84 #define KASAN_THREAD_SHIFT 1
85 #else
86 #define KASAN_SHADOW_SIZE (0)
87 #define KASAN_THREAD_SHIFT 0
88 #endif
89
90 #define MIN_THREAD_SHIFT (14 + KASAN_THREAD_SHIFT)
91
92 /*
93 * VMAP'd stacks are allocated at page granularity, so we must ensure that such
94 * stacks are a multiple of page size.
95 */
96 #if defined(CONFIG_VMAP_STACK) && (MIN_THREAD_SHIFT < PAGE_SHIFT)
97 #define THREAD_SHIFT PAGE_SHIFT
98 #else
99 #define THREAD_SHIFT MIN_THREAD_SHIFT
100 #endif
101
102 #if THREAD_SHIFT >= PAGE_SHIFT
103 #define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT)
104 #endif
105
106 #define THREAD_SIZE (UL(1) << THREAD_SHIFT)
107
108 /*
109 * By aligning VMAP'd stacks to 2 * THREAD_SIZE, we can detect overflow by
110 * checking sp & (1 << THREAD_SHIFT), which we can do cheaply in the entry
111 * assembly.
112 */
113 #ifdef CONFIG_VMAP_STACK
114 #define THREAD_ALIGN (2 * THREAD_SIZE)
115 #else
116 #define THREAD_ALIGN THREAD_SIZE
117 #endif
118
119 #define IRQ_STACK_SIZE THREAD_SIZE
120
121 #define OVERFLOW_STACK_SIZE SZ_4K
122
123 /*
124 * Alignment of kernel segments (e.g. .text, .data).
125 */
126 #if defined(CONFIG_DEBUG_ALIGN_RODATA)
127 /*
128 * 4 KB granule: 1 level 2 entry
129 * 16 KB granule: 128 level 3 entries, with contiguous bit
130 * 64 KB granule: 32 level 3 entries, with contiguous bit
131 */
132 #define SEGMENT_ALIGN SZ_2M
133 #else
134 /*
135 * 4 KB granule: 16 level 3 entries, with contiguous bit
136 * 16 KB granule: 4 level 3 entries, without contiguous bit
137 * 64 KB granule: 1 level 3 entry
138 */
139 #define SEGMENT_ALIGN SZ_64K
140 #endif
141
142 /*
143 * Memory types available.
144 */
145 #define MT_DEVICE_nGnRnE 0
146 #define MT_DEVICE_nGnRE 1
147 #define MT_DEVICE_GRE 2
148 #define MT_NORMAL_NC 3
149 #define MT_NORMAL 4
150 #define MT_NORMAL_WT 5
151
152 /*
153 * Memory types for Stage-2 translation
154 */
155 #define MT_S2_NORMAL 0xf
156 #define MT_S2_DEVICE_nGnRE 0x1
157
158 /*
159 * Memory types for Stage-2 translation when ID_AA64MMFR2_EL1.FWB is 0001
160 * Stage-2 enforces Normal-WB and Device-nGnRE
161 */
162 #define MT_S2_FWB_NORMAL 6
163 #define MT_S2_FWB_DEVICE_nGnRE 1
164
165 #ifdef CONFIG_ARM64_4K_PAGES
166 #define IOREMAP_MAX_ORDER (PUD_SHIFT)
167 #else
168 #define IOREMAP_MAX_ORDER (PMD_SHIFT)
169 #endif
170
171 #ifdef CONFIG_BLK_DEV_INITRD
172 #define __early_init_dt_declare_initrd(__start, __end) \
173 do { \
174 initrd_start = (__start); \
175 initrd_end = (__end); \
176 } while (0)
177 #endif
178
179 #ifndef __ASSEMBLY__
180
181 #include <linux/bitops.h>
182 #include <linux/mmdebug.h>
183
184 extern s64 memstart_addr;
185 /* PHYS_OFFSET - the physical address of the start of memory. */
186 #define PHYS_OFFSET ({ VM_BUG_ON(memstart_addr & 1); memstart_addr; })
187
188 /* the virtual base of the kernel image (minus TEXT_OFFSET) */
189 extern u64 kimage_vaddr;
190
191 /* the offset between the kernel virtual and physical mappings */
192 extern u64 kimage_voffset;
193
kaslr_offset(void)194 static inline unsigned long kaslr_offset(void)
195 {
196 return kimage_vaddr - KIMAGE_VADDR;
197 }
198
199 /*
200 * Allow all memory at the discovery stage. We will clip it later.
201 */
202 #define MIN_MEMBLOCK_ADDR 0
203 #define MAX_MEMBLOCK_ADDR U64_MAX
204
205 /*
206 * PFNs are used to describe any physical page; this means
207 * PFN 0 == physical address 0.
208 *
209 * This is the PFN of the first RAM page in the kernel
210 * direct-mapped view. We assume this is the first page
211 * of RAM in the mem_map as well.
212 */
213 #define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT)
214
215 /*
216 * Physical vs virtual RAM address space conversion. These are
217 * private definitions which should NOT be used outside memory.h
218 * files. Use virt_to_phys/phys_to_virt/__pa/__va instead.
219 */
220
221
222 /*
223 * The linear kernel range starts in the middle of the virtual adddress
224 * space. Testing the top bit for the start of the region is a
225 * sufficient check.
226 */
227 #define __is_lm_address(addr) (!!((addr) & BIT(VA_BITS - 1)))
228
229 #define __lm_to_phys(addr) (((addr) & ~PAGE_OFFSET) + PHYS_OFFSET)
230 #define __kimg_to_phys(addr) ((addr) - kimage_voffset)
231
232 #define __virt_to_phys_nodebug(x) ({ \
233 phys_addr_t __x = (phys_addr_t)(x); \
234 __is_lm_address(__x) ? __lm_to_phys(__x) : \
235 __kimg_to_phys(__x); \
236 })
237
238 #define __pa_symbol_nodebug(x) __kimg_to_phys((phys_addr_t)(x))
239
240 #ifdef CONFIG_DEBUG_VIRTUAL
241 extern phys_addr_t __virt_to_phys(unsigned long x);
242 extern phys_addr_t __phys_addr_symbol(unsigned long x);
243 #else
244 #define __virt_to_phys(x) __virt_to_phys_nodebug(x)
245 #define __phys_addr_symbol(x) __pa_symbol_nodebug(x)
246 #endif
247
248 #define __phys_to_virt(x) ((unsigned long)((x) - PHYS_OFFSET) | PAGE_OFFSET)
249 #define __phys_to_kimg(x) ((unsigned long)((x) + kimage_voffset))
250
251 /*
252 * Convert a page to/from a physical address
253 */
254 #define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page)))
255 #define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys)))
256
257 /*
258 * Note: Drivers should NOT use these. They are the wrong
259 * translation for translating DMA addresses. Use the driver
260 * DMA support - see dma-mapping.h.
261 */
262 #define virt_to_phys virt_to_phys
virt_to_phys(const volatile void * x)263 static inline phys_addr_t virt_to_phys(const volatile void *x)
264 {
265 return __virt_to_phys((unsigned long)(x));
266 }
267
268 #define phys_to_virt phys_to_virt
phys_to_virt(phys_addr_t x)269 static inline void *phys_to_virt(phys_addr_t x)
270 {
271 return (void *)(__phys_to_virt(x));
272 }
273
274 /*
275 * Drivers should NOT use these either.
276 */
277 #define __pa(x) __virt_to_phys((unsigned long)(x))
278 #define __pa_symbol(x) __phys_addr_symbol(RELOC_HIDE((unsigned long)(x), 0))
279 #define __pa_nodebug(x) __virt_to_phys_nodebug((unsigned long)(x))
280 #define __va(x) ((void *)__phys_to_virt((phys_addr_t)(x)))
281 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
282 #define virt_to_pfn(x) __phys_to_pfn(__virt_to_phys((unsigned long)(x)))
283 #define sym_to_pfn(x) __phys_to_pfn(__pa_symbol(x))
284
285 /*
286 * virt_to_page(k) convert a _valid_ virtual address to struct page *
287 * virt_addr_valid(k) indicates whether a virtual address is valid
288 */
289 #define ARCH_PFN_OFFSET ((unsigned long)PHYS_PFN_OFFSET)
290
291 #ifndef CONFIG_SPARSEMEM_VMEMMAP
292 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
293 #define _virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
294 #else
295 #define __virt_to_pgoff(kaddr) (((u64)(kaddr) & ~PAGE_OFFSET) / PAGE_SIZE * sizeof(struct page))
296 #define __page_to_voff(kaddr) (((u64)(kaddr) & ~VMEMMAP_START) * PAGE_SIZE / sizeof(struct page))
297
298 #define page_to_virt(page) ((void *)((__page_to_voff(page)) | PAGE_OFFSET))
299 #define virt_to_page(vaddr) ((struct page *)((__virt_to_pgoff(vaddr)) | VMEMMAP_START))
300
301 #define _virt_addr_valid(kaddr) pfn_valid((((u64)(kaddr) & ~PAGE_OFFSET) \
302 + PHYS_OFFSET) >> PAGE_SHIFT)
303 #endif
304 #endif
305
306 #define _virt_addr_is_linear(kaddr) (((u64)(kaddr)) >= PAGE_OFFSET)
307 #define virt_addr_valid(kaddr) (_virt_addr_is_linear(kaddr) && \
308 _virt_addr_valid(kaddr))
309
310 #include <asm-generic/memory_model.h>
311
312 #endif
313