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authorTseng-Hui (Frank) Lin <thlin@linux.vnet.ibm.com>2011-05-02 20:43:04 +0000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2011-05-04 15:19:26 +1000
commit851d2e2fe8dbcbe3afcad6fc4569c881d8ad4ce9 (patch)
tree94082e7751a66236febed1cf18a1f01a02084ae9 /arch/powerpc/include/asm/reg.h
parenta32e252f7cdfb3675a4e50215cfac356ed8952c4 (diff)
downloadlinaro-lsk-851d2e2fe8dbcbe3afcad6fc4569c881d8ad4ce9.tar.gz
powerpc: Add Initiate Coprocessor Store Word (icswx) support
Icswx is a PowerPC instruction to send data to a co-processor. On Book-S processors the LPAR_ID and process ID (PID) of the owning process are registered in the window context of the co-processor at initialization time. When the icswx instruction is executed the L2 generates a cop-reg transaction on PowerBus. The transaction has no address and the processor does not perform an MMU access to authenticate the transaction. The co-processor compares the LPAR_ID and the PID included in the transaction and the LPAR_ID and PID held in the window context to determine if the process is authorized to generate the transaction. The OS needs to assign a 16-bit PID for the process. This cop-PID needs to be updated during context switch. The cop-PID needs to be destroyed when the context is destroyed. Signed-off-by: Sonny Rao <sonnyrao@linux.vnet.ibm.com> Signed-off-by: Tseng-Hui (Frank) Lin <thlin@linux.vnet.ibm.com> Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/include/asm/reg.h')
-rw-r--r--arch/powerpc/include/asm/reg.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/reg.h b/arch/powerpc/include/asm/reg.h
index 1f9ac12742e..632e78e1444 100644
--- a/arch/powerpc/include/asm/reg.h
+++ b/arch/powerpc/include/asm/reg.h
@@ -188,6 +188,7 @@
#define SPRN_CTR 0x009 /* Count Register */
#define SPRN_DSCR 0x11
+#define SPRN_ACOP 0x1F /* Available Coprocessor Register */
#define SPRN_CTRLF 0x088
#define SPRN_CTRLT 0x098
#define CTRL_CT 0xc0000000 /* current thread */