14baa9922SRussell King /* 24baa9922SRussell King * arch/arm/include/asm/memory.h 34baa9922SRussell King * 44baa9922SRussell King * Copyright (C) 2000-2002 Russell King 54baa9922SRussell King * modification for nommu, Hyok S. Choi, 2004 64baa9922SRussell King * 74baa9922SRussell King * This program is free software; you can redistribute it and/or modify 84baa9922SRussell King * it under the terms of the GNU General Public License version 2 as 94baa9922SRussell King * published by the Free Software Foundation. 104baa9922SRussell King * 114baa9922SRussell King * Note: this file should not be included by non-asm/.h files 124baa9922SRussell King */ 134baa9922SRussell King #ifndef __ASM_ARM_MEMORY_H 144baa9922SRussell King #define __ASM_ARM_MEMORY_H 154baa9922SRussell King 168d5796d2SLennert Buytenhek #include <linux/compiler.h> 178d5796d2SLennert Buytenhek #include <linux/const.h> 183a6b1676SWill Deacon #include <linux/types.h> 19158e8bfeSAlessandro Rubini #include <linux/sizes.h> 208d5796d2SLennert Buytenhek 214756dcbfSCyril Chemparathy #include <asm/cache.h> 224756dcbfSCyril Chemparathy 230cdc8b92SNicolas Pitre #ifdef CONFIG_NEED_MACH_MEMORY_H 241b9f95f8SNicolas Pitre #include <mach/memory.h> 251b9f95f8SNicolas Pitre #endif 261b9f95f8SNicolas Pitre 274baa9922SRussell King /* 284baa9922SRussell King * Allow for constants defined here to be used from assembly code 294baa9922SRussell King * by prepending the UL suffix only with actual C code compilation. 304baa9922SRussell King */ 318d5796d2SLennert Buytenhek #define UL(x) _AC(x, UL) 324baa9922SRussell King 33006fa259SRussell King /* PAGE_OFFSET - the virtual address of the start of the kernel image */ 34006fa259SRussell King #define PAGE_OFFSET UL(CONFIG_PAGE_OFFSET) 35006fa259SRussell King 364baa9922SRussell King #ifdef CONFIG_MMU 374baa9922SRussell King 384baa9922SRussell King /* 394baa9922SRussell King * TASK_SIZE - the maximum size of a user space task. 404baa9922SRussell King * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area 414baa9922SRussell King */ 425d1c20bcSWill Deacon #define TASK_SIZE (UL(CONFIG_PAGE_OFFSET) - UL(SZ_16M)) 4379d1f5c9SWill Deacon #define TASK_UNMAPPED_BASE ALIGN(TASK_SIZE / 3, SZ_16M) 444baa9922SRussell King 454baa9922SRussell King /* 464baa9922SRussell King * The maximum size of a 26-bit user space task. 474baa9922SRussell King */ 485d1c20bcSWill Deacon #define TASK_SIZE_26 (UL(1) << 26) 494baa9922SRussell King 504baa9922SRussell King /* 514baa9922SRussell King * The module space lives between the addresses given by TASK_SIZE 524baa9922SRussell King * and PAGE_OFFSET - it must be within 32MB of the kernel text. 534baa9922SRussell King */ 54adca6dc2SCatalin Marinas #ifndef CONFIG_THUMB2_KERNEL 555d1c20bcSWill Deacon #define MODULES_VADDR (PAGE_OFFSET - SZ_16M) 56adca6dc2SCatalin Marinas #else 57adca6dc2SCatalin Marinas /* smaller range for Thumb-2 symbols relocation (2^24)*/ 585d1c20bcSWill Deacon #define MODULES_VADDR (PAGE_OFFSET - SZ_8M) 59adca6dc2SCatalin Marinas #endif 60adca6dc2SCatalin Marinas 61ab4f2ee1SRussell King #if TASK_SIZE > MODULES_VADDR 624baa9922SRussell King #error Top of user space clashes with start of module space 634baa9922SRussell King #endif 644baa9922SRussell King 654baa9922SRussell King /* 66d73cd428SNicolas Pitre * The highmem pkmap virtual space shares the end of the module area. 67d73cd428SNicolas Pitre */ 68d73cd428SNicolas Pitre #ifdef CONFIG_HIGHMEM 69d73cd428SNicolas Pitre #define MODULES_END (PAGE_OFFSET - PMD_SIZE) 70d73cd428SNicolas Pitre #else 71d73cd428SNicolas Pitre #define MODULES_END (PAGE_OFFSET) 72d73cd428SNicolas Pitre #endif 73d73cd428SNicolas Pitre 74d73cd428SNicolas Pitre /* 754baa9922SRussell King * The XIP kernel gets mapped at the bottom of the module vm area. 764baa9922SRussell King * Since we use sections to map it, this macro replaces the physical address 774baa9922SRussell King * with its virtual address while keeping offset from the base section. 784baa9922SRussell King */ 79ab4f2ee1SRussell King #define XIP_VIRT_ADDR(physaddr) (MODULES_VADDR + ((physaddr) & 0x000fffff)) 804baa9922SRussell King 814baa9922SRussell King /* 824baa9922SRussell King * Allow 16MB-aligned ioremap pages 834baa9922SRussell King */ 844baa9922SRussell King #define IOREMAP_MAX_ORDER 24 854baa9922SRussell King 864baa9922SRussell King #else /* CONFIG_MMU */ 874baa9922SRussell King 884baa9922SRussell King /* 894baa9922SRussell King * The limitation of user task size can grow up to the end of free ram region. 904baa9922SRussell King * It is difficult to define and perhaps will never meet the original meaning 914baa9922SRussell King * of this define that was meant to. 924baa9922SRussell King * Fortunately, there is no reference for this in noMMU mode, for now. 934baa9922SRussell King */ 9403eca200SUwe Kleine-König #define TASK_SIZE UL(0xffffffff) 954baa9922SRussell King 964baa9922SRussell King #ifndef TASK_UNMAPPED_BASE 974baa9922SRussell King #define TASK_UNMAPPED_BASE UL(0x00000000) 984baa9922SRussell King #endif 994baa9922SRussell King 1004baa9922SRussell King #ifndef END_MEM 101c931b4f6SFenkart/Bostandzhyan #define END_MEM (UL(CONFIG_DRAM_BASE) + CONFIG_DRAM_SIZE) 1024baa9922SRussell King #endif 1034baa9922SRussell King 1044baa9922SRussell King /* 1054baa9922SRussell King * The module can be at any place in ram in nommu mode. 1064baa9922SRussell King */ 107ab4f2ee1SRussell King #define MODULES_END (END_MEM) 108b713aa0bSRussell King #define MODULES_VADDR PAGE_OFFSET 1094baa9922SRussell King 11038b4205aSUwe Kleine-König #define XIP_VIRT_ADDR(physaddr) (physaddr) 11138b4205aSUwe Kleine-König 1124baa9922SRussell King #endif /* !CONFIG_MMU */ 1134baa9922SRussell King 1144baa9922SRussell King /* 1151dbd30e9SLinus Walleij * We fix the TCM memories max 32 KiB ITCM resp DTCM at these 1161dbd30e9SLinus Walleij * locations 1171dbd30e9SLinus Walleij */ 1181dbd30e9SLinus Walleij #ifdef CONFIG_HAVE_TCM 1191dbd30e9SLinus Walleij #define ITCM_OFFSET UL(0xfffe0000) 1201dbd30e9SLinus Walleij #define DTCM_OFFSET UL(0xfffe8000) 1211dbd30e9SLinus Walleij #endif 1221dbd30e9SLinus Walleij 1231dbd30e9SLinus Walleij /* 1244baa9922SRussell King * Convert a physical address to a Page Frame Number and back 1254baa9922SRussell King */ 1263a6b1676SWill Deacon #define __phys_to_pfn(paddr) ((unsigned long)((paddr) >> PAGE_SHIFT)) 1273a6b1676SWill Deacon #define __pfn_to_phys(pfn) ((phys_addr_t)(pfn) << PAGE_SHIFT) 1284baa9922SRussell King 129719301ffSRussell King /* 130719301ffSRussell King * Convert a page to/from a physical address 131719301ffSRussell King */ 132719301ffSRussell King #define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page))) 133719301ffSRussell King #define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys))) 134719301ffSRussell King 1354756dcbfSCyril Chemparathy /* 1364756dcbfSCyril Chemparathy * Minimum guaranted alignment in pgd_alloc(). The page table pointers passed 1374756dcbfSCyril Chemparathy * around in head.S and proc-*.S are shifted by this amount, in order to 1384756dcbfSCyril Chemparathy * leave spare high bits for systems with physical address extension. This 1394756dcbfSCyril Chemparathy * does not fully accomodate the 40-bit addressing capability of ARM LPAE, but 1404756dcbfSCyril Chemparathy * gives us about 38-bits or so. 1414756dcbfSCyril Chemparathy */ 1424756dcbfSCyril Chemparathy #ifdef CONFIG_ARM_LPAE 1434756dcbfSCyril Chemparathy #define ARCH_PGD_SHIFT L1_CACHE_SHIFT 1444756dcbfSCyril Chemparathy #else 1454756dcbfSCyril Chemparathy #define ARCH_PGD_SHIFT 0 1464756dcbfSCyril Chemparathy #endif 1474756dcbfSCyril Chemparathy #define ARCH_PGD_MASK ((1 << ARCH_PGD_SHIFT) - 1) 1484756dcbfSCyril Chemparathy 149b713aa0bSRussell King /* 150b713aa0bSRussell King * PLAT_PHYS_OFFSET is the offset (from zero) of the start of physical 151c6f54a9bSUwe Kleine-König * memory. This is used for XIP and NoMMU kernels, and on platforms that don't 152c6f54a9bSUwe Kleine-König * have CONFIG_ARM_PATCH_PHYS_VIRT. Assembly code must always use 153b713aa0bSRussell King * PLAT_PHYS_OFFSET and not PHYS_OFFSET. 154b713aa0bSRussell King */ 155b713aa0bSRussell King #define PLAT_PHYS_OFFSET UL(CONFIG_PHYS_OFFSET) 156b713aa0bSRussell King 1574baa9922SRussell King #ifndef __ASSEMBLY__ 1584baa9922SRussell King 1594baa9922SRussell King /* 160dc21af99SRussell King * Physical vs virtual RAM address space conversion. These are 161dc21af99SRussell King * private definitions which should NOT be used outside memory.h 162dc21af99SRussell King * files. Use virt_to_phys/phys_to_virt/__pa/__va instead. 163e26a9e00SRussell King * 164e26a9e00SRussell King * PFNs are used to describe any physical page; this means 165e26a9e00SRussell King * PFN 0 == physical address 0. 166dc21af99SRussell King */ 167e26a9e00SRussell King #if defined(__virt_to_phys) 168e26a9e00SRussell King #define PHYS_OFFSET PLAT_PHYS_OFFSET 169e26a9e00SRussell King #define PHYS_PFN_OFFSET ((unsigned long)(PHYS_OFFSET >> PAGE_SHIFT)) 170e26a9e00SRussell King 171e26a9e00SRussell King #define virt_to_pfn(kaddr) (__pa(kaddr) >> PAGE_SHIFT) 172e26a9e00SRussell King 173e26a9e00SRussell King #elif defined(CONFIG_ARM_PATCH_PHYS_VIRT) 174dc21af99SRussell King 175cada3c08SRussell King /* 176cada3c08SRussell King * Constants used to force the right instruction encodings and shifts 177cada3c08SRussell King * so that all we need to do is modify the 8-bit constant field. 178cada3c08SRussell King */ 179cada3c08SRussell King #define __PV_BITS_31_24 0x81000000 180f52bb722SSricharan R #define __PV_BITS_7_0 0x81 181cada3c08SRussell King 182e26a9e00SRussell King extern unsigned long __pv_phys_pfn_offset; 183f52bb722SSricharan R extern u64 __pv_offset; 184f52bb722SSricharan R extern void fixup_pv_table(const void *, unsigned long); 185f52bb722SSricharan R extern const void *__pv_table_begin, *__pv_table_end; 186f52bb722SSricharan R 187e26a9e00SRussell King #define PHYS_OFFSET ((phys_addr_t)__pv_phys_pfn_offset << PAGE_SHIFT) 188e26a9e00SRussell King #define PHYS_PFN_OFFSET (__pv_phys_pfn_offset) 189e26a9e00SRussell King 190e26a9e00SRussell King #define virt_to_pfn(kaddr) \ 191e26a9e00SRussell King ((((unsigned long)(kaddr) - PAGE_OFFSET) >> PAGE_SHIFT) + \ 192e26a9e00SRussell King PHYS_PFN_OFFSET) 193dc21af99SRussell King 194cada3c08SRussell King #define __pv_stub(from,to,instr,type) \ 195dc21af99SRussell King __asm__("@ __pv_stub\n" \ 196dc21af99SRussell King "1: " instr " %0, %1, %2\n" \ 197dc21af99SRussell King " .pushsection .pv_table,\"a\"\n" \ 198dc21af99SRussell King " .long 1b\n" \ 199dc21af99SRussell King " .popsection\n" \ 200dc21af99SRussell King : "=r" (to) \ 201cada3c08SRussell King : "r" (from), "I" (type)) 202dc21af99SRussell King 203f52bb722SSricharan R #define __pv_stub_mov_hi(t) \ 204f52bb722SSricharan R __asm__ volatile("@ __pv_stub_mov\n" \ 205f52bb722SSricharan R "1: mov %R0, %1\n" \ 206f52bb722SSricharan R " .pushsection .pv_table,\"a\"\n" \ 207f52bb722SSricharan R " .long 1b\n" \ 208f52bb722SSricharan R " .popsection\n" \ 209f52bb722SSricharan R : "=r" (t) \ 210f52bb722SSricharan R : "I" (__PV_BITS_7_0)) 211f52bb722SSricharan R 212f52bb722SSricharan R #define __pv_add_carry_stub(x, y) \ 213f52bb722SSricharan R __asm__ volatile("@ __pv_add_carry_stub\n" \ 214f52bb722SSricharan R "1: adds %Q0, %1, %2\n" \ 215f52bb722SSricharan R " adc %R0, %R0, #0\n" \ 216f52bb722SSricharan R " .pushsection .pv_table,\"a\"\n" \ 217f52bb722SSricharan R " .long 1b\n" \ 218f52bb722SSricharan R " .popsection\n" \ 219f52bb722SSricharan R : "+r" (y) \ 220f52bb722SSricharan R : "r" (x), "I" (__PV_BITS_31_24) \ 221f52bb722SSricharan R : "cc") 222f52bb722SSricharan R 223ca5a45c0SSantosh Shilimkar static inline phys_addr_t __virt_to_phys(unsigned long x) 224dc21af99SRussell King { 225f52bb722SSricharan R phys_addr_t t; 226f52bb722SSricharan R 227f52bb722SSricharan R if (sizeof(phys_addr_t) == 4) { 228cada3c08SRussell King __pv_stub(x, t, "add", __PV_BITS_31_24); 229f52bb722SSricharan R } else { 230f52bb722SSricharan R __pv_stub_mov_hi(t); 231f52bb722SSricharan R __pv_add_carry_stub(x, t); 232f52bb722SSricharan R } 233dc21af99SRussell King return t; 234dc21af99SRussell King } 235dc21af99SRussell King 236ca5a45c0SSantosh Shilimkar static inline unsigned long __phys_to_virt(phys_addr_t x) 237dc21af99SRussell King { 238dc21af99SRussell King unsigned long t; 239139cc2baSVictor Kamensky 240139cc2baSVictor Kamensky /* 241139cc2baSVictor Kamensky * 'unsigned long' cast discard upper word when 242139cc2baSVictor Kamensky * phys_addr_t is 64 bit, and makes sure that inline 243139cc2baSVictor Kamensky * assembler expression receives 32 bit argument 244139cc2baSVictor Kamensky * in place where 'r' 32 bit operand is expected. 245139cc2baSVictor Kamensky */ 246139cc2baSVictor Kamensky __pv_stub((unsigned long) x, t, "sub", __PV_BITS_31_24); 247dc21af99SRussell King return t; 248dc21af99SRussell King } 249ca5a45c0SSantosh Shilimkar 250dc21af99SRussell King #else 251ca5a45c0SSantosh Shilimkar 252b713aa0bSRussell King #define PHYS_OFFSET PLAT_PHYS_OFFSET 253e26a9e00SRussell King #define PHYS_PFN_OFFSET ((unsigned long)(PHYS_OFFSET >> PAGE_SHIFT)) 254b713aa0bSRussell King 255ca5a45c0SSantosh Shilimkar static inline phys_addr_t __virt_to_phys(unsigned long x) 256ca5a45c0SSantosh Shilimkar { 257ca5a45c0SSantosh Shilimkar return (phys_addr_t)x - PAGE_OFFSET + PHYS_OFFSET; 258ca5a45c0SSantosh Shilimkar } 259ca5a45c0SSantosh Shilimkar 260ca5a45c0SSantosh Shilimkar static inline unsigned long __phys_to_virt(phys_addr_t x) 261ca5a45c0SSantosh Shilimkar { 262ca5a45c0SSantosh Shilimkar return x - PHYS_OFFSET + PAGE_OFFSET; 263ca5a45c0SSantosh Shilimkar } 264ca5a45c0SSantosh Shilimkar 265e26a9e00SRussell King #define virt_to_pfn(kaddr) \ 266e26a9e00SRussell King ((((unsigned long)(kaddr) - PAGE_OFFSET) >> PAGE_SHIFT) + \ 267e26a9e00SRussell King PHYS_PFN_OFFSET) 268b4ad5155SStephen Boyd 269e26a9e00SRussell King #endif 2704baa9922SRussell King 2714baa9922SRussell King /* 2724baa9922SRussell King * These are *only* valid on the kernel direct mapped RAM memory. 2734baa9922SRussell King * Note: Drivers should NOT use these. They are the wrong 2744baa9922SRussell King * translation for translating DMA addresses. Use the driver 2754baa9922SRussell King * DMA support - see dma-mapping.h. 2764baa9922SRussell King */ 27784c4d3a6SThierry Reding #define virt_to_phys virt_to_phys 2783a6b1676SWill Deacon static inline phys_addr_t virt_to_phys(const volatile void *x) 2794baa9922SRussell King { 2804baa9922SRussell King return __virt_to_phys((unsigned long)(x)); 2814baa9922SRussell King } 2824baa9922SRussell King 28384c4d3a6SThierry Reding #define phys_to_virt phys_to_virt 2843a6b1676SWill Deacon static inline void *phys_to_virt(phys_addr_t x) 2854baa9922SRussell King { 286ca5a45c0SSantosh Shilimkar return (void *)__phys_to_virt(x); 2874baa9922SRussell King } 2884baa9922SRussell King 2894baa9922SRussell King /* 2904baa9922SRussell King * Drivers should NOT use these either. 2914baa9922SRussell King */ 2924baa9922SRussell King #define __pa(x) __virt_to_phys((unsigned long)(x)) 293ca5a45c0SSantosh Shilimkar #define __va(x) ((void *)__phys_to_virt((phys_addr_t)(x))) 2944baa9922SRussell King #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) 2954baa9922SRussell King 2965e4432d3SRussell King extern phys_addr_t (*arch_virt_to_idmap)(unsigned long x); 2975e4432d3SRussell King 2984baa9922SRussell King /* 2994dc9a817SSantosh Shilimkar * These are for systems that have a hardware interconnect supported alias of 3004dc9a817SSantosh Shilimkar * physical memory for idmap purposes. Most cases should leave these 3014dc9a817SSantosh Shilimkar * untouched. 3024dc9a817SSantosh Shilimkar */ 3034dc9a817SSantosh Shilimkar static inline phys_addr_t __virt_to_idmap(unsigned long x) 3044dc9a817SSantosh Shilimkar { 3054dc9a817SSantosh Shilimkar if (arch_virt_to_idmap) 3064dc9a817SSantosh Shilimkar return arch_virt_to_idmap(x); 3074dc9a817SSantosh Shilimkar else 3084dc9a817SSantosh Shilimkar return __virt_to_phys(x); 3094dc9a817SSantosh Shilimkar } 3104dc9a817SSantosh Shilimkar 3114dc9a817SSantosh Shilimkar #define virt_to_idmap(x) __virt_to_idmap((unsigned long)(x)) 3124dc9a817SSantosh Shilimkar 3134dc9a817SSantosh Shilimkar /* 3144baa9922SRussell King * Virtual <-> DMA view memory address translations 3154baa9922SRussell King * Again, these are *only* valid on the kernel direct mapped RAM 3164baa9922SRussell King * memory. Use of these is *deprecated* (and that doesn't mean 3174baa9922SRussell King * use the __ prefixed forms instead.) See dma-mapping.h. 3184baa9922SRussell King */ 319b5ee9002SNicolas Pitre #ifndef __virt_to_bus 320b5ee9002SNicolas Pitre #define __virt_to_bus __virt_to_phys 321b5ee9002SNicolas Pitre #define __bus_to_virt __phys_to_virt 3221c4a4f48SRussell King #define __pfn_to_bus(x) __pfn_to_phys(x) 3231c4a4f48SRussell King #define __bus_to_pfn(x) __phys_to_pfn(x) 324b5ee9002SNicolas Pitre #endif 325b5ee9002SNicolas Pitre 326a5d533eeSArnd Bergmann #ifdef CONFIG_VIRT_TO_BUS 32784c4d3a6SThierry Reding #define virt_to_bus virt_to_bus 3284baa9922SRussell King static inline __deprecated unsigned long virt_to_bus(void *x) 3294baa9922SRussell King { 3304baa9922SRussell King return __virt_to_bus((unsigned long)x); 3314baa9922SRussell King } 3324baa9922SRussell King 33384c4d3a6SThierry Reding #define bus_to_virt bus_to_virt 3344baa9922SRussell King static inline __deprecated void *bus_to_virt(unsigned long x) 3354baa9922SRussell King { 3364baa9922SRussell King return (void *)__bus_to_virt(x); 3374baa9922SRussell King } 338a5d533eeSArnd Bergmann #endif 3394baa9922SRussell King 3404baa9922SRussell King /* 3414baa9922SRussell King * Conversion between a struct page and a physical address. 3424baa9922SRussell King * 3434baa9922SRussell King * page_to_pfn(page) convert a struct page * to a PFN number 3444baa9922SRussell King * pfn_to_page(pfn) convert a _valid_ PFN number to struct page * 3454baa9922SRussell King * 3464baa9922SRussell King * virt_to_page(k) convert a _valid_ virtual address to struct page * 3474baa9922SRussell King * virt_addr_valid(k) indicates whether a virtual address is valid 3484baa9922SRussell King */ 3494baa9922SRussell King #define ARCH_PFN_OFFSET PHYS_PFN_OFFSET 3504baa9922SRussell King 351e26a9e00SRussell King #define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr)) 352efea3403SLaura Abbott #define virt_addr_valid(kaddr) (((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory) \ 353e26a9e00SRussell King && pfn_valid(virt_to_pfn(kaddr))) 3544baa9922SRussell King 3554baa9922SRussell King #endif 3564baa9922SRussell King 3574baa9922SRussell King #include <asm-generic/memory_model.h> 3584baa9922SRussell King 3594baa9922SRussell King #endif 360