/* * linux/include/asm-arm/arch-sa1100/mmzone.h * * (C) 1999-2000, Nicolas Pitre * (inspired by Kanoj Sarcar's code) * * 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 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) ); \ })