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NAME

ddi_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).  

DESCRIPTION

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.  

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 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 */
      ...
}

SEE ALSO

mmap(9E), ddi_model_convert_from(9F)

Writing Device Drivers

Index

NAME

SYNOPSIS

INTERFACE LEVEL

DESCRIPTION

RETURN VALUES

CONTEXT

EXAMPLES

SEE ALSO

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