hat_getkpfnum(9F) Kernel Functions for Drivers hat_getkpfnum(9F)NAMEhat_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This interface is obsolete.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.
DESCRIPTIONhat_getkpfnum() returns the page frame number corresponding to the ker‐
nel 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.
CONTEXThat_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 ALSOattach(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) rou‐
tine 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)
