patch-2.4.9 linux/include/asm-arm/arch-sa1100/memory.h

• Lines: 91
• Date: Sun Aug 12 11:14:00 2001
• Orig file: v2.4.8/linux/include/asm-arm/arch-sa1100/memory.h
• Orig date: Thu Feb 8 16:32:44 2001

diff -u --recursive --new-file v2.4.8/linux/include/asm-arm/arch-sa1100/memory.h linux/include/asm-arm/arch-sa1100/memory.h
@@ -1,12 +1,13 @@
 /*
  * linux/include/asm-arm/arch-sa1100/memory.h
  *
- * Copyright (c) 1999 Nicolas Pitre <nico@cam.org>
+ * Copyright (C) 1999-2000 Nicolas Pitre <nico@cam.org>
  */
 
 #ifndef __ASM_ARCH_MEMORY_H
 #define __ASM_ARCH_MEMORY_H
 
+#include <linux/config.h>
 
 /*
  * Task size: 3GB
@@ -53,5 +54,75 @@
 #define __bus_to_virt__is_a_macro
 #define __virt_to_bus(x)	 __virt_to_phys(x)
 #define __bus_to_virt(x)	 __phys_to_virt(x)
+
+#ifdef CONFIG_DISCONTIGMEM
+/*
+ * 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 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_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) ); \
+})
+
+#else
+
+#define PHYS_TO_NID(addr)	(0)
+
+#endif
 
 #endif