vunmap(9) [centos man page]

VUNMAP(9)						    Memory Management in Linux							 VUNMAP(9)

NAME

       vunmap - release virtual mapping obtained by vmap

SYNOPSIS

       void vunmap(const void * addr);

ARGUMENTS

       addr
	   memory base address

DESCRIPTION

       Free the virtually contiguous memory area starting at addr, which was created from the page array passed to vmap.

       Must not be called in interrupt context.

COPYRIGHT

Kernel Hackers Manual 3.10					     June 2014								 VUNMAP(9)

hat_getkpfnum(9F)					   Kernel Functions for Drivers 					 hat_getkpfnum(9F)

NAME

       hat_getkpfnum - get page frame number for kernel address

SYNOPSIS

       #include <sys/types.h>
       #include <sys/ddi.h>
       #include <sys/sunddi.h>

       pfn_t hat_getkpfnum(caddr_t addr);

INTERFACE LEVEL

       This interface is obsolete. A driver devmap(9E) entry point should be provided instead.

PARAMETERS

       addr	The kernel virtual address for which the page frame number is to be returned.

DESCRIPTION

       hat_getkpfnum() returns the page frame number corresponding to the kernel virtual address, addr.

       addr  must  be  a  kernel  virtual  address  which maps to device memory. ddi_map_regs(9F) can be used to obtain this address. For example,
       ddi_map_regs(9F) can be called in the driver's attach(9E) routine. The resulting kernel virtual address can be saved  by  the  driver  (see
       ddi_soft_state(9F))  and  used in mmap(9E). The corresponding ddi_unmap_regs(9F) call can be made in the driver's detach(9E) routine. Refer
       to mmap(9E) for more information.

RETURN VALUES

       The page frame number corresponding to the valid, device-mapped virtual address addr. Otherwise the return value is undefined.

CONTEXT

       hat_getkpfnum() can be called only from user or kernel context.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface stability	     |Obsolete			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       attach(9E), detach(9E), devmap(9E), mmap(9E), ddi_map_regs(9F), ddi_soft_state(9F), ddi_unmap_regs(9F)

       Writing Device Drivers

NOTES

       For some devices, mapping device memory in the driver's attach(9E) routine and unmapping device memory in the driver's  detach(9E)  routine
       is  a  sizeable	drain  on  system  resources.  This is especially true for devices with a large amount of physical address space. Refer to
       mmap(9E) for alternative methods.

SunOS 5.10							   13 June 2004 						 hat_getkpfnum(9F)