SVR5

kvtoppid(D3)

kvtoppid -- get physical page ID for kernel virtual address

Synopsis

   #include <sys/types.h>
   #include <sys/vmparam.h>
   #include <sys/ddi.h>
   
   ppid_t kvtoppid(caddr_t addr);

Description

kvtoppid returns the physical page ID corresponding to the virtual address addr.

Arguments

addr: The kernel virtual address for which the physical page ID is to be returned.

Return values

If addr is valid, the corresponding physical page ID is returned. Otherwise, NOPAGE is returned.

Usage

This routine can be used to obtain a physical page ID suitable to be used as the return value of the driver's mmap(D2) entry point.

A physical page ID is a machine-specific token that uniquely identifies a page of physical memory in the system (either system memory or device memory). No assumptions should be made about the format of a physical page ID.

Context and synchronization

Non-blockable, user or blockable context.

Hardware applicability

All

Version applicability

ddi: 3, 5, 5mp, 6, 6mp, 7, 7mp, 7.1, 7.1mp, 8, 8mp

References

mmap(D2), Intro(D3), phystoppid(D3)