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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)

Check Out this Related Man Page

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This interface is obsolete.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 5.11 13 June 2004 hat_getkpfnum(9F)
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