/* * 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 /* * 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_ARCH_EDB7211 #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 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_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(kaddr) \ (((unsigned long)(kaddr)-LOCAL_BASE_ADDR((kaddr))) >> 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) ); \ }) /* * 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<