Introduce virt_to_phys()

virt_to_phys() returns the physical address given a virtual. In most
cases this will be just the input value as the vast majority of
systems run in a 1:1 mode.

However in systems that are not running this way it should report the
physical address or ~0 if no mapping exists for the given virtual
address.
Signed-off-by: NKumar Gala <galak@kernel.crashing.org>

include/asm-arm/io.h

@@ -57,6 +57,11 @@ static inline void unmap_physmem(void *vaddr, unsigned long flags)
 
 }
 
+static inline phys_addr_t virt_to_phys(void * vaddr)
+{
+	return (phys_addr_t)(vaddr);
+}
+
 /*
  * Generic virtual read/write.  Note that we don't support half-word
  * read/writes.  We define __arch_*[bl] here, and leave __arch_*w

include/asm-avr32/io.h

@@ -125,4 +125,9 @@ static inline void unmap_physmem(void *vaddr, unsigned long len)
 
 }
 
+static inline phys_addr_t virt_to_phys(void * vaddr)
+{
+	return (phys_addr_t)(vaddr);
+}
+
 #endif /* __ASM_AVR32_IO_H */

include/asm-blackfin/io.h

@@ -64,6 +64,11 @@ static inline void unmap_physmem(void *vaddr, unsigned long flags)
 
 }
 
+static inline phys_addr_t virt_to_phys(void * vaddr)
+{
+	return (phys_addr_t)(vaddr);
+}
+
 /*
  * These are for ISA/PCI shared memory _only_ and should never be used
  * on any other type of memory, including Zorro memory. They are meant to

include/asm-i386/io.h

@@ -229,4 +229,9 @@ static inline void unmap_physmem(void *vaddr, unsigned long flags)
 
 }
 
+static inline phys_addr_t virt_to_phys(void * vaddr)
+{
+	return (phys_addr_t)(vaddr);
+}
+
 #endif

include/asm-m68k/io.h

@@ -251,4 +251,9 @@ static inline void unmap_physmem(void *vaddr, unsigned long flags)
 
 }
 
+static inline phys_addr_t virt_to_phys(void * vaddr)
+{
+	return (phys_addr_t)(vaddr);
+}
+
 #endif				/* __ASM_M68K_IO_H__ */

include/asm-microblaze/io.h

@@ -155,4 +155,9 @@ static inline void unmap_physmem(void *vaddr, unsigned long flags)
 
 }
 
+static inline phys_addr_t virt_to_phys(void * vaddr)
+{
+	return (phys_addr_t)(vaddr);
+}
+
 #endif /* __MICROBLAZE_IO_H__ */

include/asm-mips/io.h

@@ -118,7 +118,7 @@ static inline void set_io_port_base(unsigned long base)
  * Change virtual addresses to physical addresses and vv.
  * These are trivial on the 1:1 Linux/MIPS mapping
  */
-extern inline unsigned long virt_to_phys(volatile void * address)
+extern inline phys_addr_t virt_to_phys(void * address)
 {
 	return CPHYSADDR(address);
 }

include/asm-nios/io.h

@@ -133,4 +133,9 @@ static inline void unmap_physmem(void *vaddr, unsigned long flags)
 
 }
 
+static inline phys_addr_t virt_to_phys(void * vaddr)
+{
+	return (phys_addr_t)(vaddr);
+}
+
 #endif /* __ASM_NIOS_IO_H_ */

include/asm-nios2/io.h

@@ -53,6 +53,11 @@ static inline void unmap_physmem(void *vaddr, unsigned long flags)
 
 }
 
+static inline phys_addr_t virt_to_phys(void * vaddr)
+{
+	return (phys_addr_t)(vaddr);
+}
+
 extern unsigned char inb (unsigned char *port);
 extern unsigned short inw (unsigned short *port);
 extern unsigned inl (unsigned port);

include/asm-ppc/io.h

@@ -298,4 +298,9 @@ static inline void unmap_physmem(void *vaddr, unsigned long flags)
 
 }
 
+static inline phys_addr_t virt_to_phys(void * vaddr)
+{
+	return (phys_addr_t)(vaddr);
+}
+
 #endif

include/asm-sh/io.h

@@ -261,5 +261,10 @@ static inline void unmap_physmem(void *vaddr, unsigned long flags)
 
 }
 
+static inline phys_addr_t virt_to_phys(void * vaddr)
+{
+	return (phys_addr_t)(vaddr);
+}
+
 #endif	/* __KERNEL__ */
 #endif	/* __ASM_SH_IO_H */

include/asm-sparc/io.h

@@ -90,4 +90,9 @@ static inline void unmap_physmem(void *vaddr, unsigned long flags)
 
 }
 
+static inline phys_addr_t virt_to_phys(void * vaddr)
+{
+	return (phys_addr_t)(vaddr);
+}
+
 #endif