AIX Version 4.3 Differences Guide

64-bit-enabled drivers make the global kernel service replacements provided in
Table 13.
Table 13. Old and New Kernel Services Used by Device Drivers
Old Kernel Service
copyin()
copyout()
xmattach()
pinu()
unpinu()
New Kernel Service
copyin64()
copyout64()
xmattach64()
xmempin()
xmemunpin()
The xmempin()/xmemunpin() calls use the same arguments as pinu()/unpinu(),
with the exception that the third argument for xmempin()/xmemunpin() is the
address of the cross memory descriptor from xmattach()/xmattach64() instead of
a segflag. The xmattach64() call uses the same arguments as xmattach(), with
the exception that the first argument for xmattach() is of type unsigned long long
(ptr64) instead of type char *.
Note: xmattach64() enables xmempin(), so that the 64-bit address can be recast
as a 32-bit address when passed to xmempin(). The xmdetach() call is used to
undo xmattach64().
3.2.5 Loader
For AIX 4.3, the same basic loader system calls are provided to 64-bit programs.
That is, there are 64-bit versions of execve(), fork(), exit(), load(), and unload()
that are aware of the 64-bit user address space. There are also 64-bit versions of
knlist() and sysconfig(), although these just interface to the existing 32-bit
services. There is no 64-bit version of ptrace(), but 64-bit processes can be
debugged by 32-bit debuggers. Finally, the loadquery(), loadbind(), and __loadx()
functions are no longer system calls for 64-bit programs but are implemented in
libc.a.
Four new external functions are added to the loader in AIX 4.3 to support 64-bit
processing:
• ldr_init64()
This function is called during kernel initialization when a 64-bit system boots.
• ldr_config64()
This function is called by sysconfig() when a 64-bit machine is configured to
run 64-bit processes.
• ldr_gettextusage64()
This function computes the number of real memory pages used by the main
executable of a process. It only needs to be called if the main executable is
loaded in multiple working segments.
• ldr64()
This is a new system call exported to the special 64-bit process that relocates
shared objects. No other process has access to this system call.
64-Bit Enablement 51