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/*
* linux/include/asm-arm/arch-sa1100/memory.h
*
* Copyright (C) 1999-2000 Nicolas Pitre <nico@cam.org>
*/
#ifndef __ASM_ARCH_MEMORY_H
#define __ASM_ARCH_MEMORY_H
#include <linux/config.h>
/*
* Task size: 3GB
*/
#define TASK_SIZE (0xc0000000UL)
#define TASK_SIZE_26 (0x04000000UL)
/*
* 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: 3GB
*/
#define PAGE_OFFSET (0xc0000000UL)
/*
* Physical DRAM offset is 0xc0000000 on the SA1100
*/
#define PHYS_OFFSET (0xc0000000UL)
/*
* We take advantage of the fact that physical and virtual address can be the
* same. The NUMA code is handling the large holes that might exist between
* all memory banks.
*/
#define __virt_to_phys__is_a_macro
#define __phys_to_virt__is_a_macro
#define __virt_to_phys(x) (x)
#define __phys_to_virt(x) (x)
/*
* Virtual view <-> DMA view memory address translations
* virt_to_bus: Used to translate the virtual address to an
* address suitable to be passed to set_dma_addr
* bus_to_virt: Used to convert an address for DMA operations
* to an address that the kernel can use.
*
* On the SA1100, bus addresses are equivalent to physical addresses.
*/
#define __virt_to_bus__is_a_macro
#define __bus_to_virt__is_a_macro
#define __virt_to_bus(x) __virt_to_phys(x)
#define __bus_to_virt(x) __phys_to_virt(x)
#ifdef CONFIG_DISCONTIGMEM
/*
* Because of the wide memory address space between physical RAM banks on the
* SA1100, it's much convenient to use Linux's NUMA support to implement our
* memory map representation. Assuming all memory nodes have equal access
* characteristics, we then have generic discontigous memory support.
*
* Of course, all this isn't mandatory for SA1100 implementations with only
* one used memory bank. For those, simply undefine CONFIG_DISCONTIGMEM.
*
* The nodes are matched with the physical memory bank addresses which are
* incidentally the same as virtual addresses.
*
* node 0: 0xc0000000 - 0xc7ffffff
* node 1: 0xc8000000 - 0xcfffffff
* node 2: 0xd0000000 - 0xd7ffffff
* node 3: 0xd8000000 - 0xdfffffff
*/
#define NR_NODES 4
/*
* Given a kernel address, find the home node of the underlying memory.
*/
#define KVADDR_TO_NID(addr) \
(((unsigned long)(addr) - 0xc0000000) >> 27)
/*
* Given a physical address, convert it to a node id.
*/
#define PHYS_TO_NID(addr) KVADDR_TO_NID(__phys_to_virt(addr))
/*
* Given a kaddr, ADDR_TO_MAPBASE finds the owning node of the memory
* and returns the mem_map of that node.
*/
#define ADDR_TO_MAPBASE(kaddr) \
NODE_MEM_MAP(KVADDR_TO_NID((unsigned long)(kaddr)))
/*
* Given a kaddr, LOCAL_MEM_MAP finds the owning node of the memory
* and returns the index corresponding to the appropriate page in the
* node's mem_map.
*/
#define LOCAL_MAP_NR(kvaddr) \
(((unsigned long)(kvaddr) & 0x07ffffff) >> PAGE_SHIFT)
/*
* Given a kaddr, virt_to_page returns a pointer to the corresponding
* mem_map entry.
*/
#define virt_to_page(kaddr) \
(ADDR_TO_MAPBASE(kaddr) + LOCAL_MAP_NR(kaddr))
/*
* VALID_PAGE returns a non-zero value if given page pointer is valid.
* This assumes all node's mem_maps are stored within the node they refer to.
*/
#define VALID_PAGE(page) \
({ unsigned int node = KVADDR_TO_NID(page); \
( (node < NR_NODES) && \
((unsigned)((page) - NODE_MEM_MAP(node)) < NODE_DATA(node)->node_size) ); \
})
#else
#define PHYS_TO_NID(addr) (0)
#endif
#endif
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