64 bit driver compilation

Question

hi,
i need to compile a driver code in 64 bit using forte 6.2.
there is a function declaration and function definition,
something like:
xx_ioctl (dev, cmd, arg, flag, credp, rval-p);//prototype
dev_t dev;
int cmd;
int arg;
int flag;
cred_t credp;
int *rval-p;
//definition
xx_ioctl(ignorethisone,ignorethisone,(caddr_t)arg,ignorethisone,ignorethisone) { do things;}
i was getting cast warning at the "(caddr_t)arg" argument in above.
I changed the "int arg" to "long arg" and that solved all the warnings.
is this valid?.
-Raoul

Answer 1

First, make sure you are using SC5.0 compilers. The -xcode option did not exist before that. Using -xcode=abs32 will give you smaller generated code.
The -xregs=no%appl option tells the compiler not to use %g2 or %g3 registers on sparcv9. I believe this was needed only to work around a run-time linker bug prior to S7 5/99. If your driver needs to run on an earlier update of S7, you should use this option; otherwise, it is not needed.
Also read the compilation section of the
Writing Device Drivers book