From 42d02b81f265b77be39262666c888d50cb488fc5 Mon Sep 17 00:00:00 2001 From: Ian Munsie Date: Wed, 14 Nov 2012 18:49:44 +0000 Subject: 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 Tested-by: Michael Neuling Signed-off-by: Benjamin Herrenschmidt --- arch/powerpc/include/asm/reg.h | 1 + 1 file changed, 1 insertion(+) (limited to 'arch/powerpc/include/asm/reg.h') diff --git a/arch/powerpc/include/asm/reg.h b/arch/powerpc/include/asm/reg.h index 3d5c9dc8917..af88486b0c2 100644 --- a/arch/powerpc/include/asm/reg.h +++ b/arch/powerpc/include/asm/reg.h @@ -483,6 +483,7 @@ #ifndef SPRN_PIR #define SPRN_PIR 0x3FF /* Processor Identification Register */ #endif +#define SPRN_TIR 0x1BE /* Thread Identification Register */ #define SPRN_PTEHI 0x3D5 /* 981 7450 PTE HI word (S/W TLB load) */ #define SPRN_PTELO 0x3D6 /* 982 7450 PTE LO word (S/W TLB load) */ #define SPRN_PURR 0x135 /* Processor Utilization of Resources Reg */ -- cgit v1.2.3-70-g09d2