phys_to_virt(9) [suse man page]

PHYS_TO_VIRT(9) 					     Public Functions Provided						   PHYS_TO_VIRT(9)

NAME

       phys_to_virt - map physical address to virtual

SYNOPSIS

       void * phys_to_virt(phys_addr_t address);

ARGUMENTS

       address
	   address to remap

DESCRIPTION

       The returned virtual address is a current CPU mapping for the memory address given. It is only valid to use this function on addresses that
       have a kernel mapping

       This function does not handle bus mappings for DMA transfers. In almost all conceivable cases a device driver should not be using this
       function

AUTHORS

       Matthew Wilcox <matthew@wil.cx>
	   Author.

       Alan Cox <alan@lxorguk.ukuu.org.uk>
	   Author.

COPYRIGHT

Kernel Hackers Manual 2.6.					     July 2010							   PHYS_TO_VIRT(9)

PMAP_EXTRACT(9) 					   BSD Kernel Developer's Manual					   PMAP_EXTRACT(9)

NAME

     pmap_extract, pmap_extract_and_hold -- map a virtual address to a physical page

SYNOPSIS

     #include <sys/param.h>
     #include <vm/vm.h>
     #include <vm/pmap.h>

     vm_paddr_t
     pmap_extract(pmap_t pmap, vm_offset_t va);

     vm_paddr_t
     pmap_extract_and_hold(pmap_t pmap, vm_offset_t va, vm_prot_t prot);

DESCRIPTION

     The pmap_extract() function maps a virtual address to a physical page.  In certain situations, callers may use pmap_extract_and_hold()
     instead, to ensure that the returned page is held.

     The pmap_extract_and_hold() function maps a virtual address to a physical page, and atomically holds the returned page for use by the caller,
     only if the mapping permits the given page protection.

IMPLEMENTATION NOTES

     Currently, the page protection requested by the caller is not verified.

RETURN VALUES

     The pmap_extract() function will return the physical page address associated with the virtual address va inside the physical map pmap.  If
     the mapping does not exist, or if the pmap parameter is NULL, then NULL will be returned.

     The pmap_extract_and_hold() function will return the physical page address associated with the virtual address va inside the physical map
     pmap.  If the mapping does not exist, the result is a no-op, and NULL will be returned.

SEE ALSO

     mutex(9), pmap(9)

AUTHORS

     The pmap_extract_and_hold() function was implemented by Alan L. Cox <alc@imimic.com>.  This manual page was written by Bruce M Simpson
     <bms@spc.org>.

BSD
								   July 21, 2003							       BSD