264 lines
7.2 KiB
C
264 lines
7.2 KiB
C
/*
|
|
* 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 <mach/memory.h>
|
|
#include <asm/sizes.h>
|
|
|
|
/*
|
|
* 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(0x01000000))
|
|
#define TASK_UNMAPPED_BASE (UL(CONFIG_PAGE_OFFSET) / 3)
|
|
|
|
/*
|
|
* The maximum size of a 26-bit user space task.
|
|
*/
|
|
#define TASK_SIZE_26 UL(0x04000000)
|
|
|
|
/*
|
|
* 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 - 16*1024*1024)
|
|
#else
|
|
/* smaller range for Thumb-2 symbols relocation (2^24)*/
|
|
#define MODULES_VADDR (PAGE_OFFSET - 8*1024*1024)
|
|
#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
|
|
|
|
/*
|
|
* Size of DMA-consistent memory region. Must be multiple of 2M,
|
|
* between 2MB and 14MB inclusive.
|
|
*/
|
|
#ifndef CONSISTENT_DMA_SIZE
|
|
#define CONSISTENT_DMA_SIZE SZ_2M
|
|
#endif
|
|
|
|
#define CONSISTENT_END (0xffe00000UL)
|
|
#define CONSISTENT_BASE (CONSISTENT_END - CONSISTENT_DMA_SIZE)
|
|
|
|
#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)
|
|
|
|
#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
|
|
|
|
/*
|
|
* 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
|
|
#define __virt_to_phys(x) ((x) - PAGE_OFFSET + PHYS_OFFSET)
|
|
#define __phys_to_virt(x) ((x) - PHYS_OFFSET + PAGE_OFFSET)
|
|
#endif
|
|
|
|
/*
|
|
* Convert a physical address to a Page Frame Number and back
|
|
*/
|
|
#define __phys_to_pfn(paddr) ((paddr) >> PAGE_SHIFT)
|
|
#define __pfn_to_phys(pfn) ((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__
|
|
|
|
/*
|
|
* The DMA mask corresponding to the maximum bus address allocatable
|
|
* using GFP_DMA. The default here places no restriction on DMA
|
|
* allocations. This must be the smallest DMA mask in the system,
|
|
* so a successful GFP_DMA allocation will always satisfy this.
|
|
*/
|
|
#ifndef ISA_DMA_THRESHOLD
|
|
#define ISA_DMA_THRESHOLD (0xffffffffULL)
|
|
#endif
|
|
|
|
#ifndef arch_adjust_zones
|
|
#define arch_adjust_zones(size,holes) do { } while (0)
|
|
#elif !defined(CONFIG_ZONE_DMA)
|
|
#error "custom arch_adjust_zones() requires CONFIG_ZONE_DMA"
|
|
#endif
|
|
|
|
/*
|
|
* 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 unsigned long virt_to_phys(void *x)
|
|
{
|
|
return __virt_to_phys((unsigned long)(x));
|
|
}
|
|
|
|
static inline void *phys_to_virt(unsigned long 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
|
|
|
|
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);
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
|
|
/*
|
|
* Optional coherency support. Currently used only by selected
|
|
* Intel XSC3-based systems.
|
|
*/
|
|
#ifndef arch_is_coherent
|
|
#define arch_is_coherent() 0
|
|
#endif
|
|
|
|
#endif
|
|
|
|
#include <asm-generic/memory_model.h>
|
|
|
|
#endif
|