From aa42c69c67f82e88f0726258efe7306708e1cf14 Mon Sep 17 00:00:00 2001 From: Kim Phillips Date: Fri, 8 Dec 2006 02:43:30 -0600 Subject: [POWERPC] Add support for FP emulation for the e300c2 core The e300c2 has no FPU. Its MSR[FP] is grounded to zero. If an attempt is made to execute a floating point instruction (including floating-point load, store, or move instructions), the e300c2 takes a floating-point unavailable interrupt. This patch adds support for FP emulation on the e300c2 by declaring a new CPU_FTR_FP_TAKES_FPUNAVAIL, where FP unavail interrupts are intercepted and redirected to the ProgramCheck exception path for correct emulation handling. (If we run out of CPU_FTR bits we could look to reclaim this bit by adding support to test the cpu_user_features for PPC_FEATURE_HAS_FPU instead) It adds a nop to the exception path for 32-bit processors with a FPU. Signed-off-by: Kim Phillips Signed-off-by: Kumar Gala --- arch/powerpc/Kconfig | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'arch/powerpc/Kconfig') diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index 291c95ac4b31..0b2d05da89d7 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -706,7 +706,7 @@ config FORCE_MAX_ZONEORDER config MATH_EMULATION bool "Math emulation" - depends on 4xx || 8xx || E200 || E500 + depends on 4xx || 8xx || E200 || PPC_83xx || E500 ---help--- Some PowerPC chips designed for embedded applications do not have a floating-point unit and therefore do not implement the -- cgit v1.2.2