From: Kim Phillips Date: Fri, 8 Dec 2006 08:43:30 +0000 (-0600) Subject: [POWERPC] Add support for FP emulation for the e300c2 core X-Git-Tag: v2.6.20-rc1~146^2~14^2~1^2~3^2 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=aa42c69c67f82e88f0726258efe7306708e1cf14;p=pandora-kernel.git [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 --- Reading git-diff-tree failed