2 * arch/arm/include/asm/memory.h
4 * Copyright (C) 2000-2002 Russell King
5 * modification for nommu, Hyok S. Choi, 2004
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 * Note: this file should not be included by non-asm/.h files
13 #ifndef __ASM_ARM_MEMORY_H
14 #define __ASM_ARM_MEMORY_H
16 #include <linux/compiler.h>
17 #include <linux/const.h>
18 #include <linux/types.h>
19 #include <linux/sizes.h>
21 #ifdef CONFIG_NEED_MACH_MEMORY_H
22 #include <mach/memory.h>
26 * Allow for constants defined here to be used from assembly code
27 * by prepending the UL suffix only with actual C code compilation.
29 #define UL(x) _AC(x, UL)
31 /* PAGE_OFFSET - the virtual address of the start of the kernel image */
32 #define PAGE_OFFSET UL(CONFIG_PAGE_OFFSET)
37 * TASK_SIZE - the maximum size of a user space task.
38 * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area
40 #define TASK_SIZE (UL(CONFIG_PAGE_OFFSET) - UL(SZ_16M))
41 #define TASK_UNMAPPED_BASE ALIGN(TASK_SIZE / 3, SZ_16M)
44 * The maximum size of a 26-bit user space task.
46 #define TASK_SIZE_26 (UL(1) << 26)
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.
52 #ifndef CONFIG_THUMB2_KERNEL
53 #define MODULES_VADDR (PAGE_OFFSET - SZ_16M)
55 /* smaller range for Thumb-2 symbols relocation (2^24)*/
56 #define MODULES_VADDR (PAGE_OFFSET - SZ_8M)
59 #if TASK_SIZE > MODULES_VADDR
60 #error Top of user space clashes with start of module space
64 * The highmem pkmap virtual space shares the end of the module area.
67 #define MODULES_END (PAGE_OFFSET - PMD_SIZE)
69 #define MODULES_END (PAGE_OFFSET)
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.
77 #define XIP_VIRT_ADDR(physaddr) (MODULES_VADDR + ((physaddr) & 0x000fffff))
80 * Allow 16MB-aligned ioremap pages
82 #define IOREMAP_MAX_ORDER 24
84 #else /* CONFIG_MMU */
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.
92 #define TASK_SIZE UL(0xffffffff)
94 #ifndef TASK_UNMAPPED_BASE
95 #define TASK_UNMAPPED_BASE UL(0x00000000)
99 #define END_MEM (UL(CONFIG_DRAM_BASE) + CONFIG_DRAM_SIZE)
103 * The module can be at any place in ram in nommu mode.
105 #define MODULES_END (END_MEM)
106 #define MODULES_VADDR PAGE_OFFSET
108 #define XIP_VIRT_ADDR(physaddr) (physaddr)
110 #endif /* !CONFIG_MMU */
113 * We fix the TCM memories max 32 KiB ITCM resp DTCM at these
116 #ifdef CONFIG_HAVE_TCM
117 #define ITCM_OFFSET UL(0xfffe0000)
118 #define DTCM_OFFSET UL(0xfffe8000)
122 * Convert a page to/from a physical address
124 #define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page)))
125 #define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys)))
128 * PLAT_PHYS_OFFSET is the offset (from zero) of the start of physical
129 * memory. This is used for XIP and NoMMU kernels, and on platforms that don't
130 * have CONFIG_ARM_PATCH_PHYS_VIRT. Assembly code must always use
131 * PLAT_PHYS_OFFSET and not PHYS_OFFSET.
133 #define PLAT_PHYS_OFFSET UL(CONFIG_PHYS_OFFSET)
138 * Physical vs virtual RAM address space conversion. These are
139 * private definitions which should NOT be used outside memory.h
140 * files. Use virt_to_phys/phys_to_virt/__pa/__va instead.
142 * PFNs are used to describe any physical page; this means
143 * PFN 0 == physical address 0.
145 #if defined(__virt_to_phys)
146 #define PHYS_OFFSET PLAT_PHYS_OFFSET
147 #define PHYS_PFN_OFFSET ((unsigned long)(PHYS_OFFSET >> PAGE_SHIFT))
149 #define virt_to_pfn(kaddr) (__pa(kaddr) >> PAGE_SHIFT)
151 #elif defined(CONFIG_ARM_PATCH_PHYS_VIRT)
154 * Constants used to force the right instruction encodings and shifts
155 * so that all we need to do is modify the 8-bit constant field.
157 #define __PV_BITS_31_24 0x81000000
158 #define __PV_BITS_7_0 0x81
160 extern unsigned long __pv_phys_pfn_offset;
161 extern u64 __pv_offset;
162 extern void fixup_pv_table(const void *, unsigned long);
163 extern const void *__pv_table_begin, *__pv_table_end;
165 #define PHYS_OFFSET ((phys_addr_t)__pv_phys_pfn_offset << PAGE_SHIFT)
166 #define PHYS_PFN_OFFSET (__pv_phys_pfn_offset)
168 #define virt_to_pfn(kaddr) \
169 ((((unsigned long)(kaddr) - PAGE_OFFSET) >> PAGE_SHIFT) + \
172 #define __pv_stub(from,to,instr,type) \
173 __asm__("@ __pv_stub\n" \
174 "1: " instr " %0, %1, %2\n" \
175 " .pushsection .pv_table,\"a\"\n" \
179 : "r" (from), "I" (type))
181 #define __pv_stub_mov_hi(t) \
182 __asm__ volatile("@ __pv_stub_mov\n" \
184 " .pushsection .pv_table,\"a\"\n" \
188 : "I" (__PV_BITS_7_0))
190 #define __pv_add_carry_stub(x, y) \
191 __asm__ volatile("@ __pv_add_carry_stub\n" \
192 "1: adds %Q0, %1, %2\n" \
193 " adc %R0, %R0, #0\n" \
194 " .pushsection .pv_table,\"a\"\n" \
198 : "r" (x), "I" (__PV_BITS_31_24) \
201 static inline phys_addr_t __virt_to_phys(unsigned long x)
205 if (sizeof(phys_addr_t) == 4) {
206 __pv_stub(x, t, "add", __PV_BITS_31_24);
209 __pv_add_carry_stub(x, t);
214 static inline unsigned long __phys_to_virt(phys_addr_t x)
219 * 'unsigned long' cast discard upper word when
220 * phys_addr_t is 64 bit, and makes sure that inline
221 * assembler expression receives 32 bit argument
222 * in place where 'r' 32 bit operand is expected.
224 __pv_stub((unsigned long) x, t, "sub", __PV_BITS_31_24);
230 #define PHYS_OFFSET PLAT_PHYS_OFFSET
231 #define PHYS_PFN_OFFSET ((unsigned long)(PHYS_OFFSET >> PAGE_SHIFT))
233 static inline phys_addr_t __virt_to_phys(unsigned long x)
235 return (phys_addr_t)x - PAGE_OFFSET + PHYS_OFFSET;
238 static inline unsigned long __phys_to_virt(phys_addr_t x)
240 return x - PHYS_OFFSET + PAGE_OFFSET;
243 #define virt_to_pfn(kaddr) \
244 ((((unsigned long)(kaddr) - PAGE_OFFSET) >> PAGE_SHIFT) + \
250 * These are *only* valid on the kernel direct mapped RAM memory.
251 * Note: Drivers should NOT use these. They are the wrong
252 * translation for translating DMA addresses. Use the driver
253 * DMA support - see dma-mapping.h.
255 #define virt_to_phys virt_to_phys
256 static inline phys_addr_t virt_to_phys(const volatile void *x)
258 return __virt_to_phys((unsigned long)(x));
261 #define phys_to_virt phys_to_virt
262 static inline void *phys_to_virt(phys_addr_t x)
264 return (void *)__phys_to_virt(x);
268 * Drivers should NOT use these either.
270 #define __pa(x) __virt_to_phys((unsigned long)(x))
271 #define __va(x) ((void *)__phys_to_virt((phys_addr_t)(x)))
272 #define pfn_to_kaddr(pfn) __va((phys_addr_t)(pfn) << PAGE_SHIFT)
274 extern phys_addr_t (*arch_virt_to_idmap)(unsigned long x);
277 * These are for systems that have a hardware interconnect supported alias of
278 * physical memory for idmap purposes. Most cases should leave these
281 static inline phys_addr_t __virt_to_idmap(unsigned long x)
283 if (IS_ENABLED(CONFIG_MMU) && arch_virt_to_idmap)
284 return arch_virt_to_idmap(x);
286 return __virt_to_phys(x);
289 #define virt_to_idmap(x) __virt_to_idmap((unsigned long)(x))
292 * Virtual <-> DMA view memory address translations
293 * Again, these are *only* valid on the kernel direct mapped RAM
294 * memory. Use of these is *deprecated* (and that doesn't mean
295 * use the __ prefixed forms instead.) See dma-mapping.h.
297 #ifndef __virt_to_bus
298 #define __virt_to_bus __virt_to_phys
299 #define __bus_to_virt __phys_to_virt
300 #define __pfn_to_bus(x) __pfn_to_phys(x)
301 #define __bus_to_pfn(x) __phys_to_pfn(x)
304 #ifdef CONFIG_VIRT_TO_BUS
305 #define virt_to_bus virt_to_bus
306 static inline __deprecated unsigned long virt_to_bus(void *x)
308 return __virt_to_bus((unsigned long)x);
311 #define bus_to_virt bus_to_virt
312 static inline __deprecated void *bus_to_virt(unsigned long x)
314 return (void *)__bus_to_virt(x);
319 * Conversion between a struct page and a physical address.
321 * page_to_pfn(page) convert a struct page * to a PFN number
322 * pfn_to_page(pfn) convert a _valid_ PFN number to struct page *
324 * virt_to_page(k) convert a _valid_ virtual address to struct page *
325 * virt_addr_valid(k) indicates whether a virtual address is valid
327 #define ARCH_PFN_OFFSET PHYS_PFN_OFFSET
329 #define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr))
330 #define virt_addr_valid(kaddr) (((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory) \
331 && pfn_valid(virt_to_pfn(kaddr)))
335 #include <asm-generic/memory_model.h>