Commit 8d8c166f authored by Nicolas Pitre's avatar Nicolas Pitre Committed by Russell King

[ARM PATCH] 1782/1: discontigmem support for PXA chips

Patch from Nicolas Pitre
parent e96c4c63
......@@ -55,4 +55,52 @@
#define __virt_to_bus(x) __virt_to_phys(x)
#define __bus_to_virt(x) __phys_to_virt(x)
#ifdef CONFIG_DISCONTIGMEM
/*
* The nodes are matched with the physical SDRAM banks as follows:
*
* node 0: 0xa0000000-0xa3ffffff --> 0xc0000000-0xc3ffffff
* node 1: 0xa4000000-0xa7ffffff --> 0xc4000000-0xc7ffffff
* node 2: 0xa8000000-0xabffffff --> 0xc8000000-0xcbffffff
* node 3: 0xac000000-0xafffffff --> 0xcc000000-0xcfffffff
*/
#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) >> 26)
/*
* Given a page frame number, convert it to a node id.
*/
#define PFN_TO_NID(pfn) (((pfn) - PHYS_PFN_OFFSET) >> (26 - 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) & 0x03ffffff) >> PAGE_SHIFT)
#else
#define PFN_TO_NID(addr) (0)
#endif
#endif
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