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/*
* linux/include/asm-arm26/memory.h
*
* Copyright (C) 2000-2002 Russell King
*
* 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
/*
* User space: 26MB
*/
#define TASK_SIZE (0x01a00000UL)
/*
* This decides where the kernel will search for a free chunk of vm
* space during mmap's.
*/
#define TASK_UNMAPPED_BASE (TASK_SIZE / 3)
/*
* Page offset: 32MB
*/
#define PAGE_OFFSET (0x02000000UL)
#define PHYS_OFFSET (0x02000000UL)
#define PHYS_TO_NID(addr) (0)
/*
* 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.
*/
static inline unsigned long virt_to_phys(void *x)
{
return (unsigned long)x;
}
static inline void *phys_to_virt(unsigned long x)
{
return (void *)((unsigned long)x);
}
#define __pa(x) (unsigned long)(x)
#define __va(x) ((void *)(unsigned long)(x))
/*
* Virtual <-> DMA view memory address translations
* Again, these are *only* valid on the kernel direct mapped RAM
* memory. Use of these is *depreciated*.
*/
#define virt_to_bus(x) ((unsigned long)(x))
#define bus_to_virt(x) ((void *)((unsigned long)(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 *
* pfn_valid(pfn) indicates whether a PFN number is valid
*
* virt_to_page(k) convert a _valid_ virtual address to struct page *
* virt_addr_valid(k) indicates whether a virtual address is valid
*/
#define page_to_pfn(page) (((page) - mem_map) + PHYS_PFN_OFFSET)
#define pfn_to_page(pfn) ((mem_map + (pfn)) - PHYS_PFN_OFFSET)
#define pfn_valid(pfn) ((pfn) >= PHYS_PFN_OFFSET && (pfn) < (PHYS_PFN_OFFSET + max_mapnr))
#define virt_to_page(kaddr) (pfn_to_page(__pa(kaddr) >> PAGE_SHIFT))
#define virt_addr_valid(kaddr) ((int)(kaddr) >= PAGE_OFFSET && (int)(kaddr) < (unsigned long)high_memory)
/*
* For BIO. "will die". Kill me when bio_to_phys() and bvec_to_phys() die.
*/
#define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
/*
* We should really eliminate virt_to_bus() here - it's depreciated.
*/
#define page_to_bus(page) (page_address(page))
#endif
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