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'\" te .\" Copyright (c) 2006, 2016, Oracle and/or its affiliates. All rights reserved. .TH ddi_dev_regsize 9F "30 Sept 2016" "Oracle Solaris 11.4" "Kernel Functions" .SH NAME ddi_dev_regsize \- return the size of a device's register .SH SYNOPSIS .LP .nf #include <sys/conf.h> #include <sys/ddi.h> #include <sys/sunddi.h> \fBint\fR \fBddi_dev_regsize\fR(\fBdev_info_t *\fR\fIdip\fR, \fBuint_t\fR \fIrnumber\fR, \fBoff_t *\fR\fIresultp\fR); .fi .SH INTERFACE LEVEL .sp .LP Solaris DDI specific (Solaris DDI). .SH PARAMETERS .sp .ne 2 .mk .na \fB\fIdip\fR\fR .ad .RS 11n .rt A pointer to the device's \fBdev_info\fR structure. .RE .sp .ne 2 .mk .na \fB\fIrnumber\fR\fR .ad .RS 11n .rt The ordinal register number. Device registers are associated with a \fB dev_info\fR and are enumerated in arbitrary sets from \fB0\fR on up. The number of registers a device has can be determined from a call to \fBddi_dev_nregs\fR(9F). .RE .sp .ne 2 .mk .na \fB\fIresultp\fR\fR .ad .RS 11n .rt Pointer to an integer that holds the size, in bytes, of the described register (if it exists). .RE .SH DESCRIPTION .sp .LP The \fBddi_dev_regsize()\fR function returns the size, in bytes, of the device register specified by \fIdip\fR and \fIrnumber\fR. This is useful when, for example, one of the registers is a frame buffer with a varying size known only to its proms. .SH RETURN VALUES .sp .LP The \fBddi_dev_regsize()\fR function returns: .sp .ne 2 .mk .na \fB\fBDDI_SUCCESS\fR\fR .ad .RS 15n .rt A successful return. The size, in bytes, of the specified register, is set in \fIresultp\fR. .RE .sp .ne 2 .mk .na \fB\fBDDI_FAILURE\fR\fR .ad .RS 15n .rt An invalid (non-existent) register number was specified. .RE .SH CONTEXT .sp .LP The \fBddi_dev_regsize()\fR function can be called from user, interrupt, or kernel context. .SH SEE ALSO .sp .LP \fBddi_dev_nintrs\fR(9F), \fBddi_dev_nregs\fR(9F) .sp .LP \fIWriting Device Drivers in Oracle Solaris 11.4\fR