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NAME
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SYNOPSIS
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#include <sys/types.h>
#include <sys/ddi.h>
#include <sys/sunddi.h> pfnt_t hat_getkpfnum(caddr_t addr); |
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Architecture independent level 2 (DKI only).
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addr
- The kernel virtual address for which the page frame number is to be returned.
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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.
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The page frame number corresponding to the valid virtual address addr. Otherwise the return value is undefined.
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hat_getkpfnum() can be called only from user or kernel context.
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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.
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Company Info
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Contact
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Copyright 2003 Sun Microsystems, Inc. All rights reserved.
Use is subject to license terms.
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