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authorKevin Hao <haokexin@gmail.com>2013-07-16 19:57:15 +0800
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2013-08-14 14:59:19 +1000
commite05c0e81b0628808a7490c35d1803644a18b0405 (patch)
tree868072fd1f5564e1d194704e0a0c88abb715f4f5 /arch/powerpc/Kconfig
parent3a3b5aa63fad4911e239055c2c0a89ce2dac62ce (diff)
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powerpc: split She math emulation into two parts
For some SoC (such as the FSL BookE) even though there does have a hardware FPU, but not all floating point instructions are implemented. Unfortunately some versions of gcc do use these unimplemented instructions. Then we have to enable the math emulation to workaround this issue. It seems a little redundant to have the support to emulate all the floating point instructions in this case. So split the math emulation into two parts. One is for the SoC which doesn't have FPU at all and the other for the SoC which does have the hardware FPU and only need some special floating point instructions to be emulated. Signed-off-by: Kevin Hao <haokexin@gmail.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/Kconfig')
-rw-r--r--arch/powerpc/Kconfig20
1 files changed, 20 insertions, 0 deletions
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 3bf72cd..7205989b 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -312,6 +312,26 @@ config MATH_EMULATION
such as fsqrt on cores that do have an FPU but do not implement
them (such as Freescale BookE).
+choice
+ prompt "Math emulation options"
+ default MATH_EMULATION_FULL
+ depends on MATH_EMULATION
+
+config MATH_EMULATION_FULL
+ bool "Emulate all the floating point instructions"
+ ---help---
+ Select this option will enable the kernel to support to emulate
+ all the floating point instructions. If your SoC doesn't have
+ a FPU, you should select this.
+
+config MATH_EMULATION_HW_UNIMPLEMENTED
+ bool "Just emulate the FPU unimplemented instructions"
+ ---help---
+ Select this if you know there does have a hardware FPU on your
+ SoC, but some floating point instructions are not implemented by that.
+
+endchoice
+
config PPC_TRANSACTIONAL_MEM
bool "Transactional Memory support for POWERPC"
depends on PPC_BOOK3S_64
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