SVR5

devmem_size(D3)

devmem_size -- obtain the size of a device memory block

Synopsis

   #include <sys/types.h>
   #include <sys/ddi.h>
   
   size_t devmem_size(rm_key_t key, uint_t n);

Description

devmem_size( ) determines the size of a device memory block. This can be used to determine the legal range of offsets to pass to the devmem_mapin(D3) and devmem_mapout(D3) functions.

Arguments

key: resource manager key for the device, as passed to the CFG_ADD subfunction of the config(D2) entry point routine.
n: memory block number

Return values

devmem_size( ) returns the size, in bytes, of the specified memory block.

Usage

devmem_size( ) is typically called from the driver's config(D2) entry point routine before calling the devmem_mapin(D3) function to get a pointer to device memory for memory-mapped I/O.

Context and synchronization

User or blockable context.

Hardware applicability

All

Version applicability

ddi: 8, 8mp

References

devmem_mapin(D3), devmem_ppid(D3)

``Large memory support (DDI 8)'' in HDK Technical Reference,
``Memory-mapped I/O'' in HDK Technical Reference