powerpc: Define differences between doorbells on book3e and book3s

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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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Ian Munsie 2012-11-14 18:49:44 +00:00 • committed by Benjamin Herrenschmidt

parent 41c7b401b9

commit 42d02b81f2

4 changed files with 21 additions and 2 deletions

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15

arch/powerpc/include/asm/dbell.h

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3

arch/powerpc/include/asm/ppc-opcode.h

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1

arch/powerpc/include/asm/reg.h

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4

arch/powerpc/kernel/dbell.c

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