| /* |
| * arch/arm/include/asm/memory.h |
| * |
| * Copyright (C) 2000-2002 Russell King |
| * modification for nommu, Hyok S. Choi, 2004 |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| * |
| * Note: this file should not be included by non-asm/.h files |
| */ |
| #ifndef __ASM_ARM_MEMORY_H |
| #define __ASM_ARM_MEMORY_H |
| |
| #include <linux/compiler.h> |
| #include <linux/const.h> |
| #include <linux/types.h> |
| #include <linux/sizes.h> |
| |
| #include <asm/cache.h> |
| |
| #ifdef CONFIG_NEED_MACH_MEMORY_H |
| #include <mach/memory.h> |
| #endif |
| |
| /* |
| * Allow for constants defined here to be used from assembly code |
| * by prepending the UL suffix only with actual C code compilation. |
| */ |
| #define UL(x) _AC(x, UL) |
| |
| #ifdef CONFIG_MMU |
| |
| /* |
| * PAGE_OFFSET - the virtual address of the start of the kernel image |
| * TASK_SIZE - the maximum size of a user space task. |
| * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area |
| */ |
| #define PAGE_OFFSET UL(CONFIG_PAGE_OFFSET) |
| #define TASK_SIZE (UL(CONFIG_PAGE_OFFSET) - UL(SZ_16M)) |
| #define TASK_UNMAPPED_BASE ALIGN(TASK_SIZE / 3, SZ_16M) |
| |
| /* |
| * The maximum size of a 26-bit user space task. |
| */ |
| #define TASK_SIZE_26 (UL(1) << 26) |
| |
| /* |
| * The module space lives between the addresses given by TASK_SIZE |
| * and PAGE_OFFSET - it must be within 32MB of the kernel text. |
| */ |
| #ifndef CONFIG_THUMB2_KERNEL |
| #define MODULES_VADDR (PAGE_OFFSET - SZ_16M) |
| #else |
| /* smaller range for Thumb-2 symbols relocation (2^24)*/ |
| #define MODULES_VADDR (PAGE_OFFSET - SZ_8M) |
| #endif |
| |
| #if TASK_SIZE > MODULES_VADDR |
| #error Top of user space clashes with start of module space |
| #endif |
| |
| /* |
| * The highmem pkmap virtual space shares the end of the module area. |
| */ |
| #ifdef CONFIG_HIGHMEM |
| #define MODULES_END (PAGE_OFFSET - PMD_SIZE) |
| #else |
| #define MODULES_END (PAGE_OFFSET) |
| #endif |
| |
| /* |
| * The XIP kernel gets mapped at the bottom of the module vm area. |
| * Since we use sections to map it, this macro replaces the physical address |
| * with its virtual address while keeping offset from the base section. |
| */ |
| #define XIP_VIRT_ADDR(physaddr) (MODULES_VADDR + ((physaddr) & 0x000fffff)) |
| |
| /* |
| * Allow 16MB-aligned ioremap pages |
| */ |
| #define IOREMAP_MAX_ORDER 24 |
| |
| #define CONSISTENT_END (0xffe00000UL) |
| |
| #else /* CONFIG_MMU */ |
| |
| /* |
| * The limitation of user task size can grow up to the end of free ram region. |
| * It is difficult to define and perhaps will never meet the original meaning |
| * of this define that was meant to. |
| * Fortunately, there is no reference for this in noMMU mode, for now. |
| */ |
| #ifndef TASK_SIZE |
| #define TASK_SIZE (CONFIG_DRAM_SIZE) |
| #endif |
| |
| #ifndef TASK_UNMAPPED_BASE |
| #define TASK_UNMAPPED_BASE UL(0x00000000) |
| #endif |
| |
| #ifndef PHYS_OFFSET |
| #define PHYS_OFFSET UL(CONFIG_DRAM_BASE) |
| #endif |
| |
| #ifndef END_MEM |
| #define END_MEM (UL(CONFIG_DRAM_BASE) + CONFIG_DRAM_SIZE) |
| #endif |
| |
| #ifndef PAGE_OFFSET |
| #define PAGE_OFFSET (PHYS_OFFSET) |
| #endif |
| |
| /* |
| * The module can be at any place in ram in nommu mode. |
| */ |
| #define MODULES_END (END_MEM) |
| #define MODULES_VADDR (PHYS_OFFSET) |
| |
| #define XIP_VIRT_ADDR(physaddr) (physaddr) |
| |
| #endif /* !CONFIG_MMU */ |
| |
| /* |
| * We fix the TCM memories max 32 KiB ITCM resp DTCM at these |
| * locations |
| */ |
| #ifdef CONFIG_HAVE_TCM |
| #define ITCM_OFFSET UL(0xfffe0000) |
| #define DTCM_OFFSET UL(0xfffe8000) |
| #endif |
| |
| /* |
| * Convert a physical address to a Page Frame Number and back |
| */ |
| #define __phys_to_pfn(paddr) ((unsigned long)((paddr) >> PAGE_SHIFT)) |
| #define __pfn_to_phys(pfn) ((phys_addr_t)(pfn) << PAGE_SHIFT) |
| |
| /* |
| * Convert a page to/from a physical address |
| */ |
| #define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page))) |
| #define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys))) |
| |
| /* |
| * Minimum guaranted alignment in pgd_alloc(). The page table pointers passed |
| * around in head.S and proc-*.S are shifted by this amount, in order to |
| * leave spare high bits for systems with physical address extension. This |
| * does not fully accomodate the 40-bit addressing capability of ARM LPAE, but |
| * gives us about 38-bits or so. |
| */ |
| #ifdef CONFIG_ARM_LPAE |
| #define ARCH_PGD_SHIFT L1_CACHE_SHIFT |
| #else |
| #define ARCH_PGD_SHIFT 0 |
| #endif |
| #define ARCH_PGD_MASK ((1 << ARCH_PGD_SHIFT) - 1) |
| |
| #ifndef __ASSEMBLY__ |
| |
| /* |
| * Physical vs virtual RAM address space conversion. These are |
| * private definitions which should NOT be used outside memory.h |
| * files. Use virt_to_phys/phys_to_virt/__pa/__va instead. |
| */ |
| #ifndef __virt_to_phys |
| #ifdef CONFIG_ARM_PATCH_PHYS_VIRT |
| |
| /* |
| * Constants used to force the right instruction encodings and shifts |
| * so that all we need to do is modify the 8-bit constant field. |
| */ |
| #define __PV_BITS_31_24 0x81000000 |
| |
| extern unsigned long __pv_phys_offset; |
| #define PHYS_OFFSET __pv_phys_offset |
| |
| #define __pv_stub(from,to,instr,type) \ |
| __asm__("@ __pv_stub\n" \ |
| "1: " instr " %0, %1, %2\n" \ |
| " .pushsection .pv_table,\"a\"\n" \ |
| " .long 1b\n" \ |
| " .popsection\n" \ |
| : "=r" (to) \ |
| : "r" (from), "I" (type)) |
| |
| static inline unsigned long __virt_to_phys(unsigned long x) |
| { |
| unsigned long t; |
| __pv_stub(x, t, "add", __PV_BITS_31_24); |
| return t; |
| } |
| |
| static inline unsigned long __phys_to_virt(unsigned long x) |
| { |
| unsigned long t; |
| __pv_stub(x, t, "sub", __PV_BITS_31_24); |
| return t; |
| } |
| #else |
| #define __virt_to_phys(x) ((x) - PAGE_OFFSET + PHYS_OFFSET) |
| #define __phys_to_virt(x) ((x) - PHYS_OFFSET + PAGE_OFFSET) |
| #endif |
| #endif |
| #endif /* __ASSEMBLY__ */ |
| |
| #ifndef PHYS_OFFSET |
| #ifdef PLAT_PHYS_OFFSET |
| #define PHYS_OFFSET PLAT_PHYS_OFFSET |
| #else |
| #define PHYS_OFFSET UL(CONFIG_PHYS_OFFSET) |
| #endif |
| #endif |
| |
| #ifndef __ASSEMBLY__ |
| |
| /* |
| * PFNs are used to describe any physical page; this means |
| * PFN 0 == physical address 0. |
| * |
| * This is the PFN of the first RAM page in the kernel |
| * direct-mapped view. We assume this is the first page |
| * of RAM in the mem_map as well. |
| */ |
| #define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT) |
| |
| /* |
| * These are *only* valid on the kernel direct mapped RAM memory. |
| * Note: Drivers should NOT use these. They are the wrong |
| * translation for translating DMA addresses. Use the driver |
| * DMA support - see dma-mapping.h. |
| */ |
| static inline phys_addr_t virt_to_phys(const volatile void *x) |
| { |
| return __virt_to_phys((unsigned long)(x)); |
| } |
| |
| static inline void *phys_to_virt(phys_addr_t x) |
| { |
| return (void *)(__phys_to_virt((unsigned long)(x))); |
| } |
| |
| /* |
| * Drivers should NOT use these either. |
| */ |
| #define __pa(x) __virt_to_phys((unsigned long)(x)) |
| #define __va(x) ((void *)__phys_to_virt((unsigned long)(x))) |
| #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) |
| |
| /* |
| * Virtual <-> DMA view memory address translations |
| * Again, these are *only* valid on the kernel direct mapped RAM |
| * memory. Use of these is *deprecated* (and that doesn't mean |
| * use the __ prefixed forms instead.) See dma-mapping.h. |
| */ |
| #ifndef __virt_to_bus |
| #define __virt_to_bus __virt_to_phys |
| #define __bus_to_virt __phys_to_virt |
| #define __pfn_to_bus(x) __pfn_to_phys(x) |
| #define __bus_to_pfn(x) __phys_to_pfn(x) |
| #endif |
| |
| #ifdef CONFIG_VIRT_TO_BUS |
| static inline __deprecated unsigned long virt_to_bus(void *x) |
| { |
| return __virt_to_bus((unsigned long)x); |
| } |
| |
| static inline __deprecated void *bus_to_virt(unsigned long x) |
| { |
| return (void *)__bus_to_virt(x); |
| } |
| #endif |
| |
| /* |
| * Conversion between a struct page and a physical address. |
| * |
| * Note: when converting an unknown physical address to a |
| * struct page, the resulting pointer must be validated |
| * using VALID_PAGE(). It must return an invalid struct page |
| * for any physical address not corresponding to a system |
| * RAM address. |
| * |
| * page_to_pfn(page) convert a struct page * to a PFN number |
| * pfn_to_page(pfn) convert a _valid_ PFN number to struct page * |
| * |
| * virt_to_page(k) convert a _valid_ virtual address to struct page * |
| * virt_addr_valid(k) indicates whether a virtual address is valid |
| */ |
| #define ARCH_PFN_OFFSET PHYS_PFN_OFFSET |
| |
| #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) |
| #define virt_addr_valid(kaddr) ((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory) |
| |
| #endif |
| |
| #include <asm-generic/memory_model.h> |
| |
| #endif |