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/*
* linux/include/asm-arm/arch-sa1100/mmzone.h
*
* (C) 1999-2000, Nicolas Pitre <nico@cam.org>
* (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.
*/
/*
* Currently defined in arch/arm/mm/mm-sa1100.c
*/
extern pg_data_t sa1100_node_data[];
/*
* 32MB max in each bank, must fit with __virt_to_phys() & __phys_to_virt()
*/
#define NODE_MAX_MEM_SHIFT 25
#define NODE_MAX_MEM_SIZE (1<<NODE_MAX_MEM_SHIFT)
/*
* 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)
/*
* Return a pointer to the node data for node n.
*/
#define NODE_DATA(nid) (&sa1100_node_data[nid])
/*
* NODE_MEM_MAP gives the kaddr for the mem_map of the node.
*/
#define NODE_MEM_MAP(nid) (NODE_DATA(nid)->node_mem_map)
/*
* Given a mem_map_t, LOCAL_MAP_BASE finds the owning node for the
* physical page and returns the kaddr for the mem_map of that node.
*/
#define LOCAL_MAP_BASE(page) \
NODE_MEM_MAP(KVADDR_TO_NID((unsigned long)(page)))
/*
* Given a kaddr, ADDR_TO_MAPBASE finds the owning node of the memory
* and returns the the mem_map of that node.
*/
#define ADDR_TO_MAPBASE(kaddr) \
NODE_MEM_MAP(KVADDR_TO_NID((unsigned long)(kaddr)))
/*
* Given a kaddr, LOCAL_BASE_ADDR finds the owning node of the memory
* and returns the kaddr corresponding to first physical page in the
* node's mem_map.
*/
#define LOCAL_BASE_ADDR(kaddr) ((unsigned long)(kaddr) & ~(NODE_MAX_MEM_SIZE-1))
/*
* 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)-LOCAL_BASE_ADDR((kvaddr))) >> PAGE_SHIFT)
/*
* With discontigmem, the conceptual mem_map array starts from PAGE_OFFSET.
* Given a kaddr, MAP_NR returns the appropriate global mem_map index so
* it matches the corresponding node's local mem_map.
*/
#define MAP_NR(kaddr) (LOCAL_MAP_NR((kaddr)) + \
(((unsigned long)ADDR_TO_MAPBASE((kaddr)) - PAGE_OFFSET) / \
sizeof(mem_map_t)))
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