DDI_MMAP_GET_MODEL(9F)DDI_MMAP_GET_MODEL(9F)NAMEddi_mmap_get_model - return data model type of current thread
SYNOPSIS
#include <sys/ddi.h>
#include <sys/sunddi.h>
uint_t ddi_mmap_get_model(void);
INTERFACE LEVEL
Solaris DDI specific (Solaris DDI).
DESCRIPTIONddi_mmap_get_model() returns the C Language Type Model which the cur‐
rent thread expects. ddi_mmap_get_model() is used in combination with
ddi_model_convert_from(9F) in the mmap(9E) driver entry point to deter‐
mine 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 sup‐
ports a different data model.
RETURN VALUES
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.
CONTEXT
The ddi_mmap_get_model() function can only be called from the mmap(9E)
driver entry point.
EXAMPLES
Example 1 : Using ddi_mmap_get_model()
The following is an example of the mmap(9E) entry point and how to sup‐
port 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 */
...
}
SEE ALSOmmap(9E), ddi_model_convert_from(9F)
Writing Device Drivers
Feb 8, 2001 DDI_MMAP_GET_MODEL(9F)