This SWI is obsolete. Use OS_ChangeEnvironment instead.
=> R0 = address of the register save block, 0 to read
R1 = address of the callback handler, 0 to read
<= R0 = address of previous register save block
R1 = address of previous callback handler
This sets up the address of the CallBack handler and the register save block, zero for either value meaning no change - hence you can read the current value. For information on callbacks refer to OS_AddCallBack. Internally, OS_CallBack just calls OS_ChangeEnvironment.
See PRM 1, page 304.
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