- 根目录:
- arch
- arm
- include
- asm
- memory.h
/*
* 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>
#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)))
#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