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