From 851d2e2fe8dbcbe3afcad6fc4569c881d8ad4ce9 Mon Sep 17 00:00:00 2001 From: "Tseng-Hui (Frank) Lin" Date: Mon, 2 May 2011 20:43:04 +0000 Subject: 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 Signed-off-by: Tseng-Hui (Frank) Lin Signed-off-by: Anton Blanchard Signed-off-by: Benjamin Herrenschmidt --- arch/powerpc/include/asm/mmu-hash64.h | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'arch/powerpc/include/asm/mmu-hash64.h') diff --git a/arch/powerpc/include/asm/mmu-hash64.h b/arch/powerpc/include/asm/mmu-hash64.h index ae7b3efec8e5..d865bd909c7d 100644 --- a/arch/powerpc/include/asm/mmu-hash64.h +++ b/arch/powerpc/include/asm/mmu-hash64.h @@ -408,6 +408,7 @@ static inline void subpage_prot_init_new_context(struct mm_struct *mm) { } #endif /* CONFIG_PPC_SUBPAGE_PROT */ typedef unsigned long mm_context_id_t; +struct spinlock; typedef struct { mm_context_id_t id; @@ -423,6 +424,11 @@ typedef struct { #ifdef CONFIG_PPC_SUBPAGE_PROT struct subpage_prot_table spt; #endif /* CONFIG_PPC_SUBPAGE_PROT */ +#ifdef CONFIG_PPC_ICSWX + struct spinlock *cop_lockp; /* guard acop and cop_pid */ + unsigned long acop; /* mask of enabled coprocessor types */ + unsigned int cop_pid; /* pid value used with coprocessors */ +#endif /* CONFIG_PPC_ICSWX */ } mm_context_t; -- cgit