From 8f04e8e6e29c93421a95b61cad62e3918425eac7 Mon Sep 17 00:00:00 2001 From: Will Deacon Date: Tue, 7 Aug 2018 13:47:06 +0100 Subject: arm64: ssbd: Add support for PSTATE.SSBS rather than trapping to EL3 On CPUs with support for PSTATE.SSBS, the kernel can toggle the SSBD state without needing to call into firmware. This patch hooks into the existing SSBD infrastructure so that SSBS is used on CPUs that support it, but it's all made horribly complicated by the very real possibility of big/little systems that don't uniformly provide the new capability. Signed-off-by: Will Deacon Signed-off-by: Catalin Marinas --- arch/arm64/include/uapi/asm/ptrace.h | 1 + 1 file changed, 1 insertion(+) (limited to 'arch/arm64/include/uapi') diff --git a/arch/arm64/include/uapi/asm/ptrace.h b/arch/arm64/include/uapi/asm/ptrace.h index 98c4ce55d9c3..a36227fdb084 100644 --- a/arch/arm64/include/uapi/asm/ptrace.h +++ b/arch/arm64/include/uapi/asm/ptrace.h @@ -46,6 +46,7 @@ #define PSR_I_BIT 0x00000080 #define PSR_A_BIT 0x00000100 #define PSR_D_BIT 0x00000200 +#define PSR_SSBS_BIT 0x00001000 #define PSR_PAN_BIT 0x00400000 #define PSR_UAO_BIT 0x00800000 #define PSR_V_BIT 0x10000000 -- cgit v1.2.3-55-g7522