Ian Munsie 42d02b81f2
powerpc: Define differences between doorbells on book3e and book3s ...
There are a few key differences between doorbells on server compared
with embedded that we care about on Linux, namely:
- We have a new msgsndp instruction for directed privileged doorbells.
msgsnd is used for directed hypervisor doorbells.
- The tag we use in the instruction is the Thread Identification
Register of the recipient thread (since server doorbells can only
occur between threads within a single core), and is only 7 bits wide.
- A new message type is introduced for server doorbells (none of the
existing book3e message types are currently supported on book3s).
Signed-off-by: Ian Munsie <imunsie@au1.ibm.com >
Tested-by: Michael Neuling <mikey@neuling.org >
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org >
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42d02b81f2