patch-2.4.22 linux-2.4.22/include/asm-arm/memory.h

• Lines: 141
• Date: 2003-08-25 04:44:43.000000000 -0700
• Orig file: linux-2.4.21/include/asm-arm/memory.h
• Orig date: 2001-08-12 11:14:00.000000000 -0700

diff -urN linux-2.4.21/include/asm-arm/memory.h linux-2.4.22/include/asm-arm/memory.h
@@ -1,22 +1,34 @@
 /*
  *  linux/include/asm-arm/memory.h
  *
- *  Copyright (C) 2000 Russell King
+ *  Copyright (C) 2000-2002 Russell King
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  *
  *  Note: this file should not be included by non-asm/.h files
- *
- *  Modifications:
  */
 #ifndef __ASM_ARM_MEMORY_H
 #define __ASM_ARM_MEMORY_H
 
+#include <linux/config.h>
 #include <asm/arch/memory.h>
 
-static inline unsigned long virt_to_phys(volatile void *x)
+/*
+ * PFNs are used to describe any physical page; this means
+ * PFN 0 == physical address 0.
+ *
+ * This is the PFN of the first RAM page in the kernel
+ * direct-mapped view.  We assume this is the first page
+ * of RAM in the mem_map as well.
+ */
+#define PHYS_PFN_OFFSET	(PHYS_OFFSET >> PAGE_SHIFT)
+
+/*
+ * These are *only* valid on the kernel direct mapped RAM memory.
+ */
+static inline unsigned long virt_to_phys(void *x)
 {
 	return __virt_to_phys((unsigned long)(x));
 }
@@ -26,10 +38,101 @@
 	return (void *)(__phys_to_virt((unsigned long)(x)));
 }
 
+#define __pa(x)			__virt_to_phys((unsigned long)(x))
+#define __va(x)			((void *)__phys_to_virt((unsigned long)(x)))
+
 /*
  * Virtual <-> DMA view memory address translations
+ * Again, these are *only* valid on the kernel direct mapped RAM
+ * memory.  Use of these is *depreciated*.
  */
 #define virt_to_bus(x)		(__virt_to_bus((unsigned long)(x)))
 #define bus_to_virt(x)		((void *)(__bus_to_virt((unsigned long)(x))))
 
+/*
+ * Conversion between a struct page and a physical address.
+ *
+ * Note: when converting an unknown physical address to a
+ * struct page, the resulting pointer must be validated
+ * using VALID_PAGE().  It must return an invalid struct page
+ * for any physical address not corresponding to a system
+ * RAM address.
+ *
+ *  page_to_pfn(page)	convert a struct page * to a PFN number
+ *  pfn_to_page(pfn)	convert a _valid_ PFN number to struct page *
+ *  pfn_valid(pfn)	indicates whether a PFN number is valid
+ *
+ *  virt_to_page(k)	convert a _valid_ virtual address to struct page *
+ *  virt_addr_valid(k)	indicates whether a virtual address is valid
+ */
+#ifndef CONFIG_DISCONTIGMEM
+
+#define page_to_pfn(page)	(((page) - mem_map) + PHYS_PFN_OFFSET)
+#define pfn_to_page(pfn)	((mem_map + (pfn)) - PHYS_PFN_OFFSET)
+#define pfn_valid(pfn)		((pfn) >= PHYS_PFN_OFFSET && (pfn) < (PHYS_PFN_OFFSET + max_mapnr))
+
+#define virt_to_page(kaddr)	(pfn_to_page(__pa(kaddr) >> PAGE_SHIFT))
+#define virt_addr_valid(kaddr)	((kaddr) >= PAGE_OFFSET && (kaddr) < (unsigned long)high_memory)
+
+#define PHYS_TO_NID(addr)	(0)
+
+#define VALID_PAGE(page)	((page - mem_map) < max_mapnr)
+
+#else
+
+/*
+ * This is more complex.  We have a set of mem_map arrays spread
+ * around in memory.
+ */
+#define page_to_pfn(page)					\
+	(((page) - page_zone(page)->zone_mem_map)		\
+	  + (page_zone(page)->zone_start_paddr >> PAGE_SHIFT))
+
+#define pfn_to_page(pfn)					\
+	(PFN_TO_MAPBASE(pfn) + LOCAL_MAP_NR((pfn) << PAGE_SHIFT))
+
+#define pfn_valid(pfn)						\
+  ({								\
+	unsigned int node = PFN_TO_NID(pfn);			\
+	struct pglist_data *nd = NODE_DATA(node);		\
+	((node < NR_NODES) &&					\
+	 ((pfn - (nd->node_start_paddr >> PAGE_SHIFT)) < nd->node_size));\
+   })
+
+#define virt_to_page(kaddr)					\
+	(ADDR_TO_MAPBASE(kaddr) + LOCAL_MAP_NR(kaddr))
+
+#define virt_addr_valid(kaddr)	(KVADDR_TO_NID(kaddr) < NR_NODES)
+
+/*
+ * Common discontigmem stuff.
+ *  PHYS_TO_NID is used by the ARM kernel/setup.c
+ */
+#define PHYS_TO_NID(addr)	PFN_TO_NID((addr) >> PAGE_SHIFT)
+
+/*
+ * 2.4 compatibility
+ *
+ * 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.  This is actually inherently buggy.
+ */
+#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)); \
+})
+
+#endif
+
+/*
+ * For BIO.  "will die".  Kill me when bio_to_phys() and bvec_to_phys() die.
+ */
+#define page_to_phys(page)	(page_to_pfn(page) << PAGE_SHIFT)
+
+/*
+ * We should really eliminate virt_to_bus() here - it's depreciated.
+ */
+#define page_to_bus(page)	(virt_to_bus(page_address(page)))
+
 #endif