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 /* PAGE_OFFSET - the virtual address of the start of the kernel image */
26 #define PAGE_OFFSET UL(CONFIG_PAGE_OFFSET)
27
28 #ifdef CONFIG_MMU
29
30 /*
31 * TASK_SIZE - the maximum size of a user space task.
32 * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area
33 */
34 #define TASK_SIZE (UL(CONFIG_PAGE_OFFSET) - UL(SZ_16M))
35 #define TASK_UNMAPPED_BASE ALIGN(TASK_SIZE / 3, SZ_16M)
36
37 /*
38 * The maximum size of a 26-bit user space task.
39 */
40 #define TASK_SIZE_26 (UL(1) << 26)
41
42 /*
43 * The module space lives between the addresses given by TASK_SIZE
44 * and PAGE_OFFSET - it must be within 32MB of the kernel text.
45 */
46 #ifndef CONFIG_THUMB2_KERNEL
47 #define MODULES_VADDR (PAGE_OFFSET - SZ_16M)
48 #else
49 /* smaller range for Thumb-2 symbols relocation (2^24)*/
50 #define MODULES_VADDR (PAGE_OFFSET - SZ_8M)
51 #endif
52
53 #if TASK_SIZE > MODULES_VADDR
54 #error Top of user space clashes with start of module space
55 #endif
56
57 /*
58 * The highmem pkmap virtual space shares the end of the module area.
59 */
60 #ifdef CONFIG_HIGHMEM
61 #define MODULES_END (PAGE_OFFSET - PMD_SIZE)
62 #else
63 #define MODULES_END (PAGE_OFFSET)
64 #endif
65
66 /*
67 * The XIP kernel gets mapped at the bottom of the module vm area.
68 * Since we use sections to map it, this macro replaces the physical address
69 * with its virtual address while keeping offset from the base section.
70 */
71 #define XIP_VIRT_ADDR(physaddr) (MODULES_VADDR + ((physaddr) & 0x000fffff))
72
73 #if !defined(CONFIG_SMP) && !defined(CONFIG_ARM_LPAE)
74 /*
75 * Allow 16MB-aligned ioremap pages
76 */
77 #define IOREMAP_MAX_ORDER 24
78 #endif
79
80 #define VECTORS_BASE UL(0xffff0000)
81
82 #else /* CONFIG_MMU */
83
84 #ifndef __ASSEMBLY__
85 extern unsigned long setup_vectors_base(void);
86 extern unsigned long vectors_base;
87 #define VECTORS_BASE vectors_base
88 #endif
89
90 /*
91 * The limitation of user task size can grow up to the end of free ram region.
92 * It is difficult to define and perhaps will never meet the original meaning
93 * of this define that was meant to.
94 * Fortunately, there is no reference for this in noMMU mode, for now.
95 */
96 #define TASK_SIZE UL(0xffffffff)
97
98 #ifndef TASK_UNMAPPED_BASE
99 #define TASK_UNMAPPED_BASE UL(0x00000000)
100 #endif
101
102 #ifndef END_MEM
103 #define END_MEM (UL(CONFIG_DRAM_BASE) + CONFIG_DRAM_SIZE)
104 #endif
105
106 /*
107 * The module can be at any place in ram in nommu mode.
108 */
109 #define MODULES_END (END_MEM)
110 #define MODULES_VADDR PAGE_OFFSET
111
112 #define XIP_VIRT_ADDR(physaddr) (physaddr)
113
114 #endif /* !CONFIG_MMU */
115
116 #ifdef CONFIG_XIP_KERNEL
117 #define KERNEL_START _sdata
118 #else
119 #define KERNEL_START _stext
120 #endif
121 #define KERNEL_END _end
122
123 /*
124 * We fix the TCM memories max 32 KiB ITCM resp DTCM at these
125 * locations
126 */
127 #ifdef CONFIG_HAVE_TCM
128 #define ITCM_OFFSET UL(0xfffe0000)
129 #define DTCM_OFFSET UL(0xfffe8000)
130 #endif
131
132 /*
133 * Convert a page to/from a physical address
134 */
135 #define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page)))
136 #define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys)))
137
138 /*
139 * PLAT_PHYS_OFFSET is the offset (from zero) of the start of physical
140 * memory. This is used for XIP and NoMMU kernels, and on platforms that don't
141 * have CONFIG_ARM_PATCH_PHYS_VIRT. Assembly code must always use
142 * PLAT_PHYS_OFFSET and not PHYS_OFFSET.
143 */
144 #define PLAT_PHYS_OFFSET UL(CONFIG_PHYS_OFFSET)
145
146 #ifdef CONFIG_XIP_KERNEL
147 /*
148 * When referencing data in RAM from the XIP region in a relative manner
149 * with the MMU off, we need the relative offset between the two physical
150 * addresses. The macro below achieves this, which is:
151 * __pa(v_data) - __xip_pa(v_text)
152 */
153 #define PHYS_RELATIVE(v_data, v_text) \
154 (((v_data) - PAGE_OFFSET + PLAT_PHYS_OFFSET) - \
155 ((v_text) - XIP_VIRT_ADDR(CONFIG_XIP_PHYS_ADDR) + \
156 CONFIG_XIP_PHYS_ADDR))
157 #else
158 #define PHYS_RELATIVE(v_data, v_text) ((v_data) - (v_text))
159 #endif
160
161 #ifndef __ASSEMBLY__
162
163 /*
164 * Physical vs virtual RAM address space conversion. These are
165 * private definitions which should NOT be used outside memory.h
166 * files. Use virt_to_phys/phys_to_virt/__pa/__va instead.
167 *
168 * PFNs are used to describe any physical page; this means
169 * PFN 0 == physical address 0.
170 */
171
172 #if defined(CONFIG_ARM_PATCH_PHYS_VIRT)
173
174 /*
175 * Constants used to force the right instruction encodings and shifts
176 * so that all we need to do is modify the 8-bit constant field.
177 */
178 #define __PV_BITS_31_24 0x81000000
179 #define __PV_BITS_7_0 0x81
180
181 extern unsigned long __pv_phys_pfn_offset;
182 extern u64 __pv_offset;
183 extern void fixup_pv_table(const void *, unsigned long);
184 extern const void *__pv_table_begin, *__pv_table_end;
185
186 #define PHYS_OFFSET ((phys_addr_t)__pv_phys_pfn_offset << PAGE_SHIFT)
187 #define PHYS_PFN_OFFSET (__pv_phys_pfn_offset)
188
189 #define __pv_stub(from,to,instr,type) \
190 __asm__("@ __pv_stub\n" \
191 "1: " instr " %0, %1, %2\n" \
192 " .pushsection .pv_table,\"a\"\n" \
193 " .long 1b\n" \
194 " .popsection\n" \
195 : "=r" (to) \
196 : "r" (from), "I" (type))
197
198 #define __pv_stub_mov_hi(t) \
199 __asm__ volatile("@ __pv_stub_mov\n" \
200 "1: mov %R0, %1\n" \
201 " .pushsection .pv_table,\"a\"\n" \
202 " .long 1b\n" \
203 " .popsection\n" \
204 : "=r" (t) \
205 : "I" (__PV_BITS_7_0))
206
207 #define __pv_add_carry_stub(x, y) \
208 __asm__ volatile("@ __pv_add_carry_stub\n" \
209 "1: adds %Q0, %1, %2\n" \
210 " adc %R0, %R0, #0\n" \
211 " .pushsection .pv_table,\"a\"\n" \
212 " .long 1b\n" \
213 " .popsection\n" \
214 : "+r" (y) \
215 : "r" (x), "I" (__PV_BITS_31_24) \
216 : "cc")
217
__virt_to_phys_nodebug(unsigned long x)218 static inline phys_addr_t __virt_to_phys_nodebug(unsigned long x)
219 {
220 phys_addr_t t;
221
222 if (sizeof(phys_addr_t) == 4) {
223 __pv_stub(x, t, "add", __PV_BITS_31_24);
224 } else {
225 __pv_stub_mov_hi(t);
226 __pv_add_carry_stub(x, t);
227 }
228 return t;
229 }
230
__phys_to_virt(phys_addr_t x)231 static inline unsigned long __phys_to_virt(phys_addr_t x)
232 {
233 unsigned long t;
234
235 /*
236 * 'unsigned long' cast discard upper word when
237 * phys_addr_t is 64 bit, and makes sure that inline
238 * assembler expression receives 32 bit argument
239 * in place where 'r' 32 bit operand is expected.
240 */
241 __pv_stub((unsigned long) x, t, "sub", __PV_BITS_31_24);
242 return t;
243 }
244
245 #else
246
247 #define PHYS_OFFSET PLAT_PHYS_OFFSET
248 #define PHYS_PFN_OFFSET ((unsigned long)(PHYS_OFFSET >> PAGE_SHIFT))
249
__virt_to_phys_nodebug(unsigned long x)250 static inline phys_addr_t __virt_to_phys_nodebug(unsigned long x)
251 {
252 return (phys_addr_t)x - PAGE_OFFSET + PHYS_OFFSET;
253 }
254
__phys_to_virt(phys_addr_t x)255 static inline unsigned long __phys_to_virt(phys_addr_t x)
256 {
257 return x - PHYS_OFFSET + PAGE_OFFSET;
258 }
259
260 #endif
261
262 #define virt_to_pfn(kaddr) \
263 ((((unsigned long)(kaddr) - PAGE_OFFSET) >> PAGE_SHIFT) + \
264 PHYS_PFN_OFFSET)
265
266 #define __pa_symbol_nodebug(x) __virt_to_phys_nodebug((x))
267
268 #ifdef CONFIG_DEBUG_VIRTUAL
269 extern phys_addr_t __virt_to_phys(unsigned long x);
270 extern phys_addr_t __phys_addr_symbol(unsigned long x);
271 #else
272 #define __virt_to_phys(x) __virt_to_phys_nodebug(x)
273 #define __phys_addr_symbol(x) __pa_symbol_nodebug(x)
274 #endif
275
276 /*
277 * These are *only* valid on the kernel direct mapped RAM memory.
278 * Note: Drivers should NOT use these. They are the wrong
279 * translation for translating DMA addresses. Use the driver
280 * DMA support - see dma-mapping.h.
281 */
282 #define virt_to_phys virt_to_phys
virt_to_phys(const volatile void * x)283 static inline phys_addr_t virt_to_phys(const volatile void *x)
284 {
285 return __virt_to_phys((unsigned long)(x));
286 }
287
288 #define phys_to_virt phys_to_virt
phys_to_virt(phys_addr_t x)289 static inline void *phys_to_virt(phys_addr_t x)
290 {
291 return (void *)__phys_to_virt(x);
292 }
293
294 /*
295 * Drivers should NOT use these either.
296 */
297 #define __pa(x) __virt_to_phys((unsigned long)(x))
298 #define __pa_symbol(x) __phys_addr_symbol(RELOC_HIDE((unsigned long)(x), 0))
299 #define __va(x) ((void *)__phys_to_virt((phys_addr_t)(x)))
300 #define pfn_to_kaddr(pfn) __va((phys_addr_t)(pfn) << PAGE_SHIFT)
301
302 extern long long arch_phys_to_idmap_offset;
303
304 /*
305 * These are for systems that have a hardware interconnect supported alias
306 * of physical memory for idmap purposes. Most cases should leave these
307 * untouched. Note: this can only return addresses less than 4GiB.
308 */
arm_has_idmap_alias(void)309 static inline bool arm_has_idmap_alias(void)
310 {
311 return IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset != 0;
312 }
313
314 #define IDMAP_INVALID_ADDR ((u32)~0)
315
phys_to_idmap(phys_addr_t addr)316 static inline unsigned long phys_to_idmap(phys_addr_t addr)
317 {
318 if (IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset) {
319 addr += arch_phys_to_idmap_offset;
320 if (addr > (u32)~0)
321 addr = IDMAP_INVALID_ADDR;
322 }
323 return addr;
324 }
325
idmap_to_phys(unsigned long idmap)326 static inline phys_addr_t idmap_to_phys(unsigned long idmap)
327 {
328 phys_addr_t addr = idmap;
329
330 if (IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset)
331 addr -= arch_phys_to_idmap_offset;
332
333 return addr;
334 }
335
__virt_to_idmap(unsigned long x)336 static inline unsigned long __virt_to_idmap(unsigned long x)
337 {
338 return phys_to_idmap(__virt_to_phys(x));
339 }
340
341 #define virt_to_idmap(x) __virt_to_idmap((unsigned long)(x))
342
343 /*
344 * Virtual <-> DMA view memory address translations
345 * Again, these are *only* valid on the kernel direct mapped RAM
346 * memory. Use of these is *deprecated* (and that doesn't mean
347 * use the __ prefixed forms instead.) See dma-mapping.h.
348 */
349 #ifndef __virt_to_bus
350 #define __virt_to_bus __virt_to_phys
351 #define __bus_to_virt __phys_to_virt
352 #define __pfn_to_bus(x) __pfn_to_phys(x)
353 #define __bus_to_pfn(x) __phys_to_pfn(x)
354 #endif
355
356 /*
357 * Conversion between a struct page and a physical address.
358 *
359 * page_to_pfn(page) convert a struct page * to a PFN number
360 * pfn_to_page(pfn) convert a _valid_ PFN number to struct page *
361 *
362 * virt_to_page(k) convert a _valid_ virtual address to struct page *
363 * virt_addr_valid(k) indicates whether a virtual address is valid
364 */
365 #define ARCH_PFN_OFFSET PHYS_PFN_OFFSET
366
367 #define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr))
368 #define virt_addr_valid(kaddr) (((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory) \
369 && pfn_valid(virt_to_pfn(kaddr)))
370
371 #endif
372
373 #include <asm-generic/memory_model.h>
374
375 #endif
376
