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| author | Kim Phillips <kim.phillips@freescale.com> | 2006-12-08 02:43:30 -0600 |
|---|---|---|
| committer | Kumar Gala <galak@kernel.crashing.org> | 2006-12-08 02:43:30 -0600 |
| commit | aa42c69c67f82e88f0726258efe7306708e1cf14 (patch) | |
| tree | d5305de3285d504e1bd1e955155e5e06b5b9ef76 /arch/powerpc/Kconfig | |
| parent | c99767974ebd2a719d849fdeaaa1674456f5283f (diff) | |
| download | lwn-aa42c69c67f82e88f0726258efe7306708e1cf14.tar.gz lwn-aa42c69c67f82e88f0726258efe7306708e1cf14.zip | |
[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 <kim.phillips@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/Kconfig')
| -rw-r--r-- | arch/powerpc/Kconfig | 2 |
1 files changed, 1 insertions, 1 deletions
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 |