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 #include <asm/cache.h>
23 #ifdef CONFIG_NEED_MACH_MEMORY_H
24 #include <mach/memory.h>
28 * Allow for constants defined here to be used from assembly code
29 * by prepending the UL suffix only with actual C code compilation.
31 #define UL(x) _AC(x, UL)
36 * PAGE_OFFSET - the virtual address of the start of the kernel image
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 PAGE_OFFSET UL(CONFIG_PAGE_OFFSET)
41 #define TASK_SIZE (UL(CONFIG_PAGE_OFFSET) - UL(SZ_16M))
42 #define TASK_UNMAPPED_BASE ALIGN(TASK_SIZE / 3, SZ_16M)
45 * The maximum size of a 26-bit user space task.
47 #define TASK_SIZE_26 (UL(1) << 26)
50 * The module space lives between the addresses given by TASK_SIZE
51 * and PAGE_OFFSET - it must be within 32MB of the kernel text.
53 #ifndef CONFIG_THUMB2_KERNEL
54 #define MODULES_VADDR (PAGE_OFFSET - SZ_16M)
56 /* smaller range for Thumb-2 symbols relocation (2^24)*/
57 #define MODULES_VADDR (PAGE_OFFSET - SZ_8M)
60 #if TASK_SIZE > MODULES_VADDR
61 #error Top of user space clashes with start of module space
65 * The highmem pkmap virtual space shares the end of the module area.
68 #define MODULES_END (PAGE_OFFSET - PMD_SIZE)
70 #define MODULES_END (PAGE_OFFSET)
74 * The XIP kernel gets mapped at the bottom of the module vm area.
75 * Since we use sections to map it, this macro replaces the physical address
76 * with its virtual address while keeping offset from the base section.
78 #define XIP_VIRT_ADDR(physaddr) (MODULES_VADDR + ((physaddr) & 0x000fffff))
81 * Allow 16MB-aligned ioremap pages
83 #define IOREMAP_MAX_ORDER 24
85 #define CONSISTENT_END (0xffe00000UL)
87 #else /* CONFIG_MMU */
90 * The limitation of user task size can grow up to the end of free ram region.
91 * It is difficult to define and perhaps will never meet the original meaning
92 * of this define that was meant to.
93 * Fortunately, there is no reference for this in noMMU mode, for now.
96 #define TASK_SIZE (CONFIG_DRAM_SIZE)
99 #ifndef TASK_UNMAPPED_BASE
100 #define TASK_UNMAPPED_BASE UL(0x00000000)
104 #define PHYS_OFFSET UL(CONFIG_DRAM_BASE)
108 #define END_MEM (UL(CONFIG_DRAM_BASE) + CONFIG_DRAM_SIZE)
112 #define PAGE_OFFSET (PHYS_OFFSET)
116 * The module can be at any place in ram in nommu mode.
118 #define MODULES_END (END_MEM)
119 #define MODULES_VADDR (PHYS_OFFSET)
121 #define XIP_VIRT_ADDR(physaddr) (physaddr)
123 #endif /* !CONFIG_MMU */
126 * We fix the TCM memories max 32 KiB ITCM resp DTCM at these
129 #ifdef CONFIG_HAVE_TCM
130 #define ITCM_OFFSET UL(0xfffe0000)
131 #define DTCM_OFFSET UL(0xfffe8000)
135 * Convert a physical address to a Page Frame Number and back
137 #define __phys_to_pfn(paddr) ((unsigned long)((paddr) >> PAGE_SHIFT))
138 #define __pfn_to_phys(pfn) ((phys_addr_t)(pfn) << PAGE_SHIFT)
141 * Convert a page to/from a physical address
143 #define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page)))
144 #define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys)))
147 * Minimum guaranted alignment in pgd_alloc(). The page table pointers passed
148 * around in head.S and proc-*.S are shifted by this amount, in order to
149 * leave spare high bits for systems with physical address extension. This
150 * does not fully accomodate the 40-bit addressing capability of ARM LPAE, but
151 * gives us about 38-bits or so.
153 #ifdef CONFIG_ARM_LPAE
154 #define ARCH_PGD_SHIFT L1_CACHE_SHIFT
156 #define ARCH_PGD_SHIFT 0
158 #define ARCH_PGD_MASK ((1 << ARCH_PGD_SHIFT) - 1)
163 * Physical vs virtual RAM address space conversion. These are
164 * private definitions which should NOT be used outside memory.h
165 * files. Use virt_to_phys/phys_to_virt/__pa/__va instead.
167 #ifndef __virt_to_phys
168 #ifdef CONFIG_ARM_PATCH_PHYS_VIRT
171 * Constants used to force the right instruction encodings and shifts
172 * so that all we need to do is modify the 8-bit constant field.
174 #define __PV_BITS_31_24 0x81000000
175 #define __PV_BITS_7_0 0x81
177 extern u64 __pv_phys_offset;
178 extern u64 __pv_offset;
179 extern void fixup_pv_table(const void *, unsigned long);
180 extern const void *__pv_table_begin, *__pv_table_end;
182 #define PHYS_OFFSET __pv_phys_offset
184 #define __pv_stub(from,to,instr,type) \
185 __asm__("@ __pv_stub\n" \
186 "1: " instr " %0, %1, %2\n" \
187 " .pushsection .pv_table,\"a\"\n" \
191 : "r" (from), "I" (type))
193 #define __pv_stub_mov_hi(t) \
194 __asm__ volatile("@ __pv_stub_mov\n" \
196 " .pushsection .pv_table,\"a\"\n" \
200 : "I" (__PV_BITS_7_0))
202 #define __pv_add_carry_stub(x, y) \
203 __asm__ volatile("@ __pv_add_carry_stub\n" \
204 "1: adds %Q0, %1, %2\n" \
205 " adc %R0, %R0, #0\n" \
206 " .pushsection .pv_table,\"a\"\n" \
210 : "r" (x), "I" (__PV_BITS_31_24) \
213 static inline phys_addr_t __virt_to_phys(unsigned long x)
217 if (sizeof(phys_addr_t) == 4) {
218 __pv_stub(x, t, "add", __PV_BITS_31_24);
221 __pv_add_carry_stub(x, t);
226 static inline unsigned long __phys_to_virt(phys_addr_t x)
229 __pv_stub(x, t, "sub", __PV_BITS_31_24);
235 static inline phys_addr_t __virt_to_phys(unsigned long x)
237 return (phys_addr_t)x - PAGE_OFFSET + PHYS_OFFSET;
240 static inline unsigned long __phys_to_virt(phys_addr_t x)
242 return x - PHYS_OFFSET + PAGE_OFFSET;
247 #endif /* __ASSEMBLY__ */
250 #ifdef PLAT_PHYS_OFFSET
251 #define PHYS_OFFSET PLAT_PHYS_OFFSET
253 #define PHYS_OFFSET UL(CONFIG_PHYS_OFFSET)
260 * PFNs are used to describe any physical page; this means
261 * PFN 0 == physical address 0.
263 * This is the PFN of the first RAM page in the kernel
264 * direct-mapped view. We assume this is the first page
265 * of RAM in the mem_map as well.
267 #define PHYS_PFN_OFFSET ((unsigned long)(PHYS_OFFSET >> PAGE_SHIFT))
270 * These are *only* valid on the kernel direct mapped RAM memory.
271 * Note: Drivers should NOT use these. They are the wrong
272 * translation for translating DMA addresses. Use the driver
273 * DMA support - see dma-mapping.h.
275 static inline phys_addr_t virt_to_phys(const volatile void *x)
277 return __virt_to_phys((unsigned long)(x));
280 static inline void *phys_to_virt(phys_addr_t x)
282 return (void *)__phys_to_virt(x);
286 * Drivers should NOT use these either.
288 #define __pa(x) __virt_to_phys((unsigned long)(x))
289 #define __va(x) ((void *)__phys_to_virt((phys_addr_t)(x)))
290 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
292 extern phys_addr_t (*arch_virt_to_idmap)(unsigned long x);
295 * These are for systems that have a hardware interconnect supported alias of
296 * physical memory for idmap purposes. Most cases should leave these
299 static inline phys_addr_t __virt_to_idmap(unsigned long x)
301 if (arch_virt_to_idmap)
302 return arch_virt_to_idmap(x);
304 return __virt_to_phys(x);
307 #define virt_to_idmap(x) __virt_to_idmap((unsigned long)(x))
310 * Virtual <-> DMA view memory address translations
311 * Again, these are *only* valid on the kernel direct mapped RAM
312 * memory. Use of these is *deprecated* (and that doesn't mean
313 * use the __ prefixed forms instead.) See dma-mapping.h.
315 #ifndef __virt_to_bus
316 #define __virt_to_bus __virt_to_phys
317 #define __bus_to_virt __phys_to_virt
318 #define __pfn_to_bus(x) __pfn_to_phys(x)
319 #define __bus_to_pfn(x) __phys_to_pfn(x)
322 #ifdef CONFIG_VIRT_TO_BUS
323 static inline __deprecated unsigned long virt_to_bus(void *x)
325 return __virt_to_bus((unsigned long)x);
328 static inline __deprecated void *bus_to_virt(unsigned long x)
330 return (void *)__bus_to_virt(x);
335 * Conversion between a struct page and a physical address.
337 * page_to_pfn(page) convert a struct page * to a PFN number
338 * pfn_to_page(pfn) convert a _valid_ PFN number to struct page *
340 * virt_to_page(k) convert a _valid_ virtual address to struct page *
341 * virt_addr_valid(k) indicates whether a virtual address is valid
343 #define ARCH_PFN_OFFSET PHYS_PFN_OFFSET
345 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
346 #define virt_addr_valid(kaddr) ((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory)
350 #include <asm-generic/memory_model.h>