Subversion Repositories or1k

/*

 * 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 more 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 discontiguous 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) - PAGE_OFFSET) >> 27)

/*

 * Given a page frame number, convert it to a node id.

 */

#define PFN_TO_NID(pfn)         (((pfn) - PHYS_PFN_OFFSET) >> (27 - PAGE_SHIFT))

/*

 * 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(kaddr))

/*

 * Given a page frame number, find the owning node of the memory

 * and returns the mem_map of that node.

 */

#define PFN_TO_MAPBASE(pfn)     NODE_MEM_MAP(PFN_TO_NID(pfn))

/*

 * 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(addr) \

        (((unsigned long)(addr) & 0x07ffffff) >> PAGE_SHIFT)

#else

#define PFN_TO_NID(addr)        (0)

#endif

#endif