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/*

 *  linux/include/asm-arm/arch-clps711x/mmu.h

 *

 *  Copyright (C) 1999 ARM Limited

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 */

#ifndef __ASM_ARCH_MMU_H

#define __ASM_ARCH_MMU_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)

#define PHYS_OFFSET     (0xc0000000UL)

/*

 * On integrator, the dram is contiguous

 */

#define __virt_to_phys__is_a_macro

#define __virt_to_phys(vpage) ((vpage) - PAGE_OFFSET + PHYS_OFFSET)

#define __phys_to_virt__is_a_macro

#define __phys_to_virt(ppage) ((ppage) + PAGE_OFFSET - PHYS_OFFSET)

/*

 * 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.

 */

#if defined(CONFIG_ARCH_CDB89712)

#define __virt_to_bus__is_a_macro

#define __virt_to_bus(x)        (x)

#define __bus_to_virt__is_a_macro

#define __bus_to_virt(x)        (x)

#elif defined (CONFIG_ARCH_AUTCPU12)

#define __virt_to_bus__is_a_macro

#define __virt_to_bus(x)        (x)

#define __bus_to_virt__is_a_macro

#define __bus_to_virt(x)        (x)

#else

#define __virt_to_bus__is_a_macro

#define __virt_to_bus(x)        ((x) - PAGE_OFFSET)

#define __bus_to_virt__is_a_macro

#define __bus_to_virt(x)        ((x) + PAGE_OFFSET)

#endif

/*

 * Like the SA1100, the EDB7211 has a large gap between physical RAM

 * banks.  In 2.2, the Psion (CL-PS7110) port added custom support for

 * discontiguous physical memory.  In 2.4, we can use the standard

 * Linux NUMA support.

 *

 * This is not necessary for EP7211 implementations with only one used

 * memory bank.  For those systems, simply undefine CONFIG_DISCONTIGMEM.

 */

#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 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) - PAGE_OFFSET) >> NODE_MAX_MEM_SHIFT)

/*

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

 */

#define PFN_TO_NID(pfn) \

        (((pfn) - PHYS_PFN_OFFSET) >> (NODE_MAX_MEM_SHIFT - 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((unsigned long)(kaddr)))

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

/*

 * Given a kaddr, LOCAL_MAR_NR 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) & (NODE_MAX_MEM_SIZE - 1)) >> PAGE_SHIFT)

/*

 * The PS7211 allows up to 256MB max per DRAM bank, but the EDB7211

 * uses only one of the two banks (bank #1).  However, even within

 * bank #1, memory is discontiguous.

 *

 * The EDB7211 has two 8MB DRAM areas with 8MB of empty space between

 * them, so we use 24 for the node max shift to get 16MB node sizes.

 */

#define NODE_MAX_MEM_SHIFT      24

#define NODE_MAX_MEM_SIZE       (1<<NODE_MAX_MEM_SHIFT)

#endif /* CONFIG_DISCONTIGMEM */

#endif