Copyright (c) 2001 Sun Microsystems, Inc.
All Rights Reserved.
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When distributing Covered Code, include this CDDL HEADER in each file and include the License file at usr/src/OPENSOLARIS.LICENSE. If applicable, add the following below this CDDL HEADER, with the fields enclosed by brackets "[]" replaced with your own identifying information: Portions Copyright [yyyy] [name of copyright owner]
#include <sys/ddi.h> #include <sys/sunddi.h> uint_t ddi_mmap_get_model(void);
Solaris DDI specific (Solaris DDI).
ddi_mmap_get_model() returns the C Language Type Model which the current thread expects. ddi_mmap_get_model() is used in combination with ddi_model_convert_from(9F) in the mmap(9E) driver entry point to determine whether there is a data model mismatch between the current thread and the device driver. The device driver might have to adjust the shape of data structures before exporting them to a user thread which supports a different data model.
DDI_MODEL_ILP32
Current thread expects 32-bit (ILP32) semantics.
DDI_MODEL_LP64
Current thread expects 64-bit (LP64) semantics.
DDI_FAILURE
The ddi_mmap_get_model() function was not called from the mmap(9E) entry point.
The ddi_mmap_get_model() function can only be called from the mmap(9E) driver entry point.
Example 1 : Using ddi_mmap_get_model()
The following is an example of the mmap(9E) entry point and how to support 32-bit and 64-bit applications with the same device driver.
struct data32 {
int len;
caddr32_t addr;
};
struct data {
int len;
caddr_t addr;
};
xxmmap(dev_t dev, off_t off, int prot) {
struct data dtc; /* a local copy for clash resolution */
struct data *dp = (struct data *)shared_area;
switch (ddi_model_convert_from(ddi_mmap_get_model())) {
case DDI_MODEL_ILP32:
{
struct data32 *da32p;
da32p = (struct data32 *)shared_area;
dp = &dtc;
dp->len = da32p->len;
dp->address = da32->address;
break;
}
case DDI_MODEL_NONE:
break;
}
/* continues along using dp */
.\|.\|.
}
mmap(9E), ddi_model_convert_from(9F)
Writing Device Drivers