Merge branch 'for-4.2-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj...
[deliverable/linux.git] / arch / arm / include / asm / memory.h
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 /*
80 * Allow 16MB-aligned ioremap pages
81 */
82 #define IOREMAP_MAX_ORDER 24
83
84 #else /* CONFIG_MMU */
85
86 /*
87 * The limitation of user task size can grow up to the end of free ram region.
88 * It is difficult to define and perhaps will never meet the original meaning
89 * of this define that was meant to.
90 * Fortunately, there is no reference for this in noMMU mode, for now.
91 */
92 #define TASK_SIZE UL(0xffffffff)
93
94 #ifndef TASK_UNMAPPED_BASE
95 #define TASK_UNMAPPED_BASE UL(0x00000000)
96 #endif
97
98 #ifndef END_MEM
99 #define END_MEM (UL(CONFIG_DRAM_BASE) + CONFIG_DRAM_SIZE)
100 #endif
101
102 /*
103 * The module can be at any place in ram in nommu mode.
104 */
105 #define MODULES_END (END_MEM)
106 #define MODULES_VADDR PAGE_OFFSET
107
108 #define XIP_VIRT_ADDR(physaddr) (physaddr)
109
110 #endif /* !CONFIG_MMU */
111
112 /*
113 * We fix the TCM memories max 32 KiB ITCM resp DTCM at these
114 * locations
115 */
116 #ifdef CONFIG_HAVE_TCM
117 #define ITCM_OFFSET UL(0xfffe0000)
118 #define DTCM_OFFSET UL(0xfffe8000)
119 #endif
120
121 /*
122 * Convert a physical address to a Page Frame Number and back
123 */
124 #define __phys_to_pfn(paddr) ((unsigned long)((paddr) >> PAGE_SHIFT))
125 #define __pfn_to_phys(pfn) ((phys_addr_t)(pfn) << PAGE_SHIFT)
126
127 /*
128 * Convert a page to/from a physical address
129 */
130 #define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page)))
131 #define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys)))
132
133 /*
134 * PLAT_PHYS_OFFSET is the offset (from zero) of the start of physical
135 * memory. This is used for XIP and NoMMU kernels, and on platforms that don't
136 * have CONFIG_ARM_PATCH_PHYS_VIRT. Assembly code must always use
137 * PLAT_PHYS_OFFSET and not PHYS_OFFSET.
138 */
139 #define PLAT_PHYS_OFFSET UL(CONFIG_PHYS_OFFSET)
140
141 #ifndef __ASSEMBLY__
142
143 /*
144 * Physical vs virtual RAM address space conversion. These are
145 * private definitions which should NOT be used outside memory.h
146 * files. Use virt_to_phys/phys_to_virt/__pa/__va instead.
147 *
148 * PFNs are used to describe any physical page; this means
149 * PFN 0 == physical address 0.
150 */
151 #if defined(__virt_to_phys)
152 #define PHYS_OFFSET PLAT_PHYS_OFFSET
153 #define PHYS_PFN_OFFSET ((unsigned long)(PHYS_OFFSET >> PAGE_SHIFT))
154
155 #define virt_to_pfn(kaddr) (__pa(kaddr) >> PAGE_SHIFT)
156
157 #elif defined(CONFIG_ARM_PATCH_PHYS_VIRT)
158
159 /*
160 * Constants used to force the right instruction encodings and shifts
161 * so that all we need to do is modify the 8-bit constant field.
162 */
163 #define __PV_BITS_31_24 0x81000000
164 #define __PV_BITS_7_0 0x81
165
166 extern unsigned long __pv_phys_pfn_offset;
167 extern u64 __pv_offset;
168 extern void fixup_pv_table(const void *, unsigned long);
169 extern const void *__pv_table_begin, *__pv_table_end;
170
171 #define PHYS_OFFSET ((phys_addr_t)__pv_phys_pfn_offset << PAGE_SHIFT)
172 #define PHYS_PFN_OFFSET (__pv_phys_pfn_offset)
173
174 #define virt_to_pfn(kaddr) \
175 ((((unsigned long)(kaddr) - PAGE_OFFSET) >> PAGE_SHIFT) + \
176 PHYS_PFN_OFFSET)
177
178 #define __pv_stub(from,to,instr,type) \
179 __asm__("@ __pv_stub\n" \
180 "1: " instr " %0, %1, %2\n" \
181 " .pushsection .pv_table,\"a\"\n" \
182 " .long 1b\n" \
183 " .popsection\n" \
184 : "=r" (to) \
185 : "r" (from), "I" (type))
186
187 #define __pv_stub_mov_hi(t) \
188 __asm__ volatile("@ __pv_stub_mov\n" \
189 "1: mov %R0, %1\n" \
190 " .pushsection .pv_table,\"a\"\n" \
191 " .long 1b\n" \
192 " .popsection\n" \
193 : "=r" (t) \
194 : "I" (__PV_BITS_7_0))
195
196 #define __pv_add_carry_stub(x, y) \
197 __asm__ volatile("@ __pv_add_carry_stub\n" \
198 "1: adds %Q0, %1, %2\n" \
199 " adc %R0, %R0, #0\n" \
200 " .pushsection .pv_table,\"a\"\n" \
201 " .long 1b\n" \
202 " .popsection\n" \
203 : "+r" (y) \
204 : "r" (x), "I" (__PV_BITS_31_24) \
205 : "cc")
206
207 static inline phys_addr_t __virt_to_phys(unsigned long x)
208 {
209 phys_addr_t t;
210
211 if (sizeof(phys_addr_t) == 4) {
212 __pv_stub(x, t, "add", __PV_BITS_31_24);
213 } else {
214 __pv_stub_mov_hi(t);
215 __pv_add_carry_stub(x, t);
216 }
217 return t;
218 }
219
220 static inline unsigned long __phys_to_virt(phys_addr_t x)
221 {
222 unsigned long t;
223
224 /*
225 * 'unsigned long' cast discard upper word when
226 * phys_addr_t is 64 bit, and makes sure that inline
227 * assembler expression receives 32 bit argument
228 * in place where 'r' 32 bit operand is expected.
229 */
230 __pv_stub((unsigned long) x, t, "sub", __PV_BITS_31_24);
231 return t;
232 }
233
234 #else
235
236 #define PHYS_OFFSET PLAT_PHYS_OFFSET
237 #define PHYS_PFN_OFFSET ((unsigned long)(PHYS_OFFSET >> PAGE_SHIFT))
238
239 static inline phys_addr_t __virt_to_phys(unsigned long x)
240 {
241 return (phys_addr_t)x - PAGE_OFFSET + PHYS_OFFSET;
242 }
243
244 static inline unsigned long __phys_to_virt(phys_addr_t x)
245 {
246 return x - PHYS_OFFSET + PAGE_OFFSET;
247 }
248
249 #define virt_to_pfn(kaddr) \
250 ((((unsigned long)(kaddr) - PAGE_OFFSET) >> PAGE_SHIFT) + \
251 PHYS_PFN_OFFSET)
252
253 #endif
254
255 /*
256 * These are *only* valid on the kernel direct mapped RAM memory.
257 * Note: Drivers should NOT use these. They are the wrong
258 * translation for translating DMA addresses. Use the driver
259 * DMA support - see dma-mapping.h.
260 */
261 #define virt_to_phys virt_to_phys
262 static inline phys_addr_t virt_to_phys(const volatile void *x)
263 {
264 return __virt_to_phys((unsigned long)(x));
265 }
266
267 #define phys_to_virt phys_to_virt
268 static inline void *phys_to_virt(phys_addr_t x)
269 {
270 return (void *)__phys_to_virt(x);
271 }
272
273 /*
274 * Drivers should NOT use these either.
275 */
276 #define __pa(x) __virt_to_phys((unsigned long)(x))
277 #define __va(x) ((void *)__phys_to_virt((phys_addr_t)(x)))
278 #define pfn_to_kaddr(pfn) __va((phys_addr_t)(pfn) << PAGE_SHIFT)
279
280 extern phys_addr_t (*arch_virt_to_idmap)(unsigned long x);
281
282 /*
283 * These are for systems that have a hardware interconnect supported alias of
284 * physical memory for idmap purposes. Most cases should leave these
285 * untouched.
286 */
287 static inline phys_addr_t __virt_to_idmap(unsigned long x)
288 {
289 if (IS_ENABLED(CONFIG_MMU) && arch_virt_to_idmap)
290 return arch_virt_to_idmap(x);
291 else
292 return __virt_to_phys(x);
293 }
294
295 #define virt_to_idmap(x) __virt_to_idmap((unsigned long)(x))
296
297 /*
298 * Virtual <-> DMA view memory address translations
299 * Again, these are *only* valid on the kernel direct mapped RAM
300 * memory. Use of these is *deprecated* (and that doesn't mean
301 * use the __ prefixed forms instead.) See dma-mapping.h.
302 */
303 #ifndef __virt_to_bus
304 #define __virt_to_bus __virt_to_phys
305 #define __bus_to_virt __phys_to_virt
306 #define __pfn_to_bus(x) __pfn_to_phys(x)
307 #define __bus_to_pfn(x) __phys_to_pfn(x)
308 #endif
309
310 #ifdef CONFIG_VIRT_TO_BUS
311 #define virt_to_bus virt_to_bus
312 static inline __deprecated unsigned long virt_to_bus(void *x)
313 {
314 return __virt_to_bus((unsigned long)x);
315 }
316
317 #define bus_to_virt bus_to_virt
318 static inline __deprecated void *bus_to_virt(unsigned long x)
319 {
320 return (void *)__bus_to_virt(x);
321 }
322 #endif
323
324 /*
325 * Conversion between a struct page and a physical address.
326 *
327 * page_to_pfn(page) convert a struct page * to a PFN number
328 * pfn_to_page(pfn) convert a _valid_ PFN number to struct page *
329 *
330 * virt_to_page(k) convert a _valid_ virtual address to struct page *
331 * virt_addr_valid(k) indicates whether a virtual address is valid
332 */
333 #define ARCH_PFN_OFFSET PHYS_PFN_OFFSET
334
335 #define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr))
336 #define virt_addr_valid(kaddr) (((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory) \
337 && pfn_valid(virt_to_pfn(kaddr)))
338
339 #endif
340
341 #include <asm-generic/memory_model.h>
342
343 #endif
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