1 /*
2 * arch/arm/include/asm/memory.h
3 *
4 * Copyright (C) 2000-2002 Russell King
5 * modification for nommu, Hyok S. Choi, 2004
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 * Note: this file should not be included by non-asm/.h files
12 */
13 #ifndef __ASM_ARM_MEMORY_H
14 #define __ASM_ARM_MEMORY_H
15
16 #include <linux/compiler.h>
17 #include <linux/const.h>
18 #include <linux/types.h>
19 #include <linux/sizes.h>
20
21 #ifdef CONFIG_NEED_MACH_MEMORY_H
22 #include <mach/memory.h>
23 #endif
24
25 /*
26 * Allow for constants defined here to be used from assembly code
27 * by prepending the UL suffix only with actual C code compilation.
28 */
29 #define UL(x) _AC(x, UL)
30
31 /* PAGE_OFFSET - the virtual address of the start of the kernel image */
32 #define PAGE_OFFSET UL(CONFIG_PAGE_OFFSET)
33
34 #ifdef CONFIG_MMU
35
36 /*
37 * TASK_SIZE - the maximum size of a user space task.
38 * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area
39 */
40 #define TASK_SIZE (UL(CONFIG_PAGE_OFFSET) - UL(SZ_16M))
41 #define TASK_UNMAPPED_BASE ALIGN(TASK_SIZE / 3, SZ_16M)
42
43 /*
44 * The maximum size of a 26-bit user space task.
45 */
46 #define TASK_SIZE_26 (UL(1) << 26)
47
48 /*
49 * The module space lives between the addresses given by TASK_SIZE
50 * and PAGE_OFFSET - it must be within 32MB of the kernel text.
51 */
52 #ifndef CONFIG_THUMB2_KERNEL
53 #define MODULES_VADDR (PAGE_OFFSET - SZ_16M)
54 #else
55 /* smaller range for Thumb-2 symbols relocation (2^24)*/
56 #define MODULES_VADDR (PAGE_OFFSET - SZ_8M)
57 #endif
58
59 #if TASK_SIZE > MODULES_VADDR
60 #error Top of user space clashes with start of module space
61 #endif
62
63 /*
64 * The highmem pkmap virtual space shares the end of the module area.
65 */
66 #ifdef CONFIG_HIGHMEM
67 #define MODULES_END (PAGE_OFFSET - PMD_SIZE)
68 #else
69 #define MODULES_END (PAGE_OFFSET)
70 #endif
71
72 /*
73 * The XIP kernel gets mapped at the bottom of the module vm area.
74 * Since we use sections to map it, this macro replaces the physical address
75 * with its virtual address while keeping offset from the base section.
76 */
77 #define XIP_VIRT_ADDR(physaddr) (MODULES_VADDR + ((physaddr) & 0x000fffff))
78
79 #if !defined(CONFIG_SMP) && !defined(CONFIG_ARM_LPAE)
80 /*
81 * Allow 16MB-aligned ioremap pages
82 */
83 #define IOREMAP_MAX_ORDER 24
84 #endif
85
86 #else /* CONFIG_MMU */
87
88 /*
89 * The limitation of user task size can grow up to the end of free ram region.
90 * It is difficult to define and perhaps will never meet the original meaning
91 * of this define that was meant to.
92 * Fortunately, there is no reference for this in noMMU mode, for now.
93 */
94 #define TASK_SIZE UL(0xffffffff)
95
96 #ifndef TASK_UNMAPPED_BASE
97 #define TASK_UNMAPPED_BASE UL(0x00000000)
98 #endif
99
100 #ifndef END_MEM
101 #define END_MEM (UL(CONFIG_DRAM_BASE) + CONFIG_DRAM_SIZE)
102 #endif
103
104 /*
105 * The module can be at any place in ram in nommu mode.
106 */
107 #define MODULES_END (END_MEM)
108 #define MODULES_VADDR PAGE_OFFSET
109
110 #define XIP_VIRT_ADDR(physaddr) (physaddr)
111
112 #endif /* !CONFIG_MMU */
113
114 /*
115 * We fix the TCM memories max 32 KiB ITCM resp DTCM at these
116 * locations
117 */
118 #ifdef CONFIG_HAVE_TCM
119 #define ITCM_OFFSET UL(0xfffe0000)
120 #define DTCM_OFFSET UL(0xfffe8000)
121 #endif
122
123 /*
124 * Convert a page to/from a physical address
125 */
126 #define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page)))
127 #define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys)))
128
129 /*
130 * PLAT_PHYS_OFFSET is the offset (from zero) of the start of physical
131 * memory. This is used for XIP and NoMMU kernels, and on platforms that don't
132 * have CONFIG_ARM_PATCH_PHYS_VIRT. Assembly code must always use
133 * PLAT_PHYS_OFFSET and not PHYS_OFFSET.
134 */
135 #define PLAT_PHYS_OFFSET UL(CONFIG_PHYS_OFFSET)
136
137 #ifndef __ASSEMBLY__
138
139 /*
140 * Physical vs virtual RAM address space conversion. These are
141 * private definitions which should NOT be used outside memory.h
142 * files. Use virt_to_phys/phys_to_virt/__pa/__va instead.
143 *
144 * PFNs are used to describe any physical page; this means
145 * PFN 0 == physical address 0.
146 */
147 #if defined(__virt_to_phys)
148 #define PHYS_OFFSET PLAT_PHYS_OFFSET
149 #define PHYS_PFN_OFFSET ((unsigned long)(PHYS_OFFSET >> PAGE_SHIFT))
150
151 #define virt_to_pfn(kaddr) (__pa(kaddr) >> PAGE_SHIFT)
152
153 #elif defined(CONFIG_ARM_PATCH_PHYS_VIRT)
154
155 /*
156 * Constants used to force the right instruction encodings and shifts
157 * so that all we need to do is modify the 8-bit constant field.
158 */
159 #define __PV_BITS_31_24 0x81000000
160 #define __PV_BITS_7_0 0x81
161
162 extern unsigned long __pv_phys_pfn_offset;
163 extern u64 __pv_offset;
164 extern void fixup_pv_table(const void *, unsigned long);
165 extern const void *__pv_table_begin, *__pv_table_end;
166
167 #define PHYS_OFFSET ((phys_addr_t)__pv_phys_pfn_offset << PAGE_SHIFT)
168 #define PHYS_PFN_OFFSET (__pv_phys_pfn_offset)
169
170 #define virt_to_pfn(kaddr) \
171 ((((unsigned long)(kaddr) - PAGE_OFFSET) >> PAGE_SHIFT) + \
172 PHYS_PFN_OFFSET)
173
174 #define __pv_stub(from,to,instr,type) \
175 __asm__("@ __pv_stub\n" \
176 "1: " instr " %0, %1, %2\n" \
177 " .pushsection .pv_table,\"a\"\n" \
178 " .long 1b\n" \
179 " .popsection\n" \
180 : "=r" (to) \
181 : "r" (from), "I" (type))
182
183 #define __pv_stub_mov_hi(t) \
184 __asm__ volatile("@ __pv_stub_mov\n" \
185 "1: mov %R0, %1\n" \
186 " .pushsection .pv_table,\"a\"\n" \
187 " .long 1b\n" \
188 " .popsection\n" \
189 : "=r" (t) \
190 : "I" (__PV_BITS_7_0))
191
192 #define __pv_add_carry_stub(x, y) \
193 __asm__ volatile("@ __pv_add_carry_stub\n" \
194 "1: adds %Q0, %1, %2\n" \
195 " adc %R0, %R0, #0\n" \
196 " .pushsection .pv_table,\"a\"\n" \
197 " .long 1b\n" \
198 " .popsection\n" \
199 : "+r" (y) \
200 : "r" (x), "I" (__PV_BITS_31_24) \
201 : "cc")
202
__virt_to_phys(unsigned long x)203 static inline phys_addr_t __virt_to_phys(unsigned long x)
204 {
205 phys_addr_t t;
206
207 if (sizeof(phys_addr_t) == 4) {
208 __pv_stub(x, t, "add", __PV_BITS_31_24);
209 } else {
210 __pv_stub_mov_hi(t);
211 __pv_add_carry_stub(x, t);
212 }
213 return t;
214 }
215
__phys_to_virt(phys_addr_t x)216 static inline unsigned long __phys_to_virt(phys_addr_t x)
217 {
218 unsigned long t;
219
220 /*
221 * 'unsigned long' cast discard upper word when
222 * phys_addr_t is 64 bit, and makes sure that inline
223 * assembler expression receives 32 bit argument
224 * in place where 'r' 32 bit operand is expected.
225 */
226 __pv_stub((unsigned long) x, t, "sub", __PV_BITS_31_24);
227 return t;
228 }
229
230 #else
231
232 #define PHYS_OFFSET PLAT_PHYS_OFFSET
233 #define PHYS_PFN_OFFSET ((unsigned long)(PHYS_OFFSET >> PAGE_SHIFT))
234
__virt_to_phys(unsigned long x)235 static inline phys_addr_t __virt_to_phys(unsigned long x)
236 {
237 return (phys_addr_t)x - PAGE_OFFSET + PHYS_OFFSET;
238 }
239
__phys_to_virt(phys_addr_t x)240 static inline unsigned long __phys_to_virt(phys_addr_t x)
241 {
242 return x - PHYS_OFFSET + PAGE_OFFSET;
243 }
244
245 #define virt_to_pfn(kaddr) \
246 ((((unsigned long)(kaddr) - PAGE_OFFSET) >> PAGE_SHIFT) + \
247 PHYS_PFN_OFFSET)
248
249 #endif
250
251 /*
252 * These are *only* valid on the kernel direct mapped RAM memory.
253 * Note: Drivers should NOT use these. They are the wrong
254 * translation for translating DMA addresses. Use the driver
255 * DMA support - see dma-mapping.h.
256 */
257 #define virt_to_phys virt_to_phys
virt_to_phys(const volatile void * x)258 static inline phys_addr_t virt_to_phys(const volatile void *x)
259 {
260 return __virt_to_phys((unsigned long)(x));
261 }
262
263 #define phys_to_virt phys_to_virt
phys_to_virt(phys_addr_t x)264 static inline void *phys_to_virt(phys_addr_t x)
265 {
266 return (void *)__phys_to_virt(x);
267 }
268
269 /*
270 * Drivers should NOT use these either.
271 */
272 #define __pa(x) __virt_to_phys((unsigned long)(x))
273 #define __va(x) ((void *)__phys_to_virt((phys_addr_t)(x)))
274 #define pfn_to_kaddr(pfn) __va((phys_addr_t)(pfn) << PAGE_SHIFT)
275
276 extern phys_addr_t (*arch_virt_to_idmap)(unsigned long x);
277
278 /*
279 * These are for systems that have a hardware interconnect supported alias of
280 * physical memory for idmap purposes. Most cases should leave these
281 * untouched.
282 */
__virt_to_idmap(unsigned long x)283 static inline phys_addr_t __virt_to_idmap(unsigned long x)
284 {
285 if (IS_ENABLED(CONFIG_MMU) && arch_virt_to_idmap)
286 return arch_virt_to_idmap(x);
287 else
288 return __virt_to_phys(x);
289 }
290
291 #define virt_to_idmap(x) __virt_to_idmap((unsigned long)(x))
292
293 /*
294 * Virtual <-> DMA view memory address translations
295 * Again, these are *only* valid on the kernel direct mapped RAM
296 * memory. Use of these is *deprecated* (and that doesn't mean
297 * use the __ prefixed forms instead.) See dma-mapping.h.
298 */
299 #ifndef __virt_to_bus
300 #define __virt_to_bus __virt_to_phys
301 #define __bus_to_virt __phys_to_virt
302 #define __pfn_to_bus(x) __pfn_to_phys(x)
303 #define __bus_to_pfn(x) __phys_to_pfn(x)
304 #endif
305
306 #ifdef CONFIG_VIRT_TO_BUS
307 #define virt_to_bus virt_to_bus
virt_to_bus(void * x)308 static inline __deprecated unsigned long virt_to_bus(void *x)
309 {
310 return __virt_to_bus((unsigned long)x);
311 }
312
313 #define bus_to_virt bus_to_virt
bus_to_virt(unsigned long x)314 static inline __deprecated void *bus_to_virt(unsigned long x)
315 {
316 return (void *)__bus_to_virt(x);
317 }
318 #endif
319
320 /*
321 * Conversion between a struct page and a physical address.
322 *
323 * page_to_pfn(page) convert a struct page * to a PFN number
324 * pfn_to_page(pfn) convert a _valid_ PFN number to struct page *
325 *
326 * virt_to_page(k) convert a _valid_ virtual address to struct page *
327 * virt_addr_valid(k) indicates whether a virtual address is valid
328 */
329 #define ARCH_PFN_OFFSET PHYS_PFN_OFFSET
330
331 #define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr))
332 #define virt_addr_valid(kaddr) (((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory) \
333 && pfn_valid(virt_to_pfn(kaddr)))
334
335 #endif
336
337 #include <asm-generic/memory_model.h>
338
339 #endif
340