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m68k: make support for FPU hardware configurable

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The classic m68k code has always supported an FPU (although it may have
been a software emulated one). The non-MMU m68k code has never supported FPU
hardware. To help in merging common code create a configation setting that
signifies if we are builing in FPU support or not.

This switch, CONFIG_FPU, is set as per the current use cases. So it is
always enabled if CONFIG_MMU is set, and disabled otherwise. With a little
extra code it will be possible to disable it on the classic m68k platforms
as well, and to enable it on non-MMU platforms that do have hardware FPU.

Signed-off-by: Greg Ungerer <gerg@uclinux.org>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
This commit is contained in:
Greg Ungerer 2012-01-30 11:58:21 +10:00
parent 43dec91f4d
commit 9657a87205
1 changed files with 4 additions and 0 deletions
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4
arch/m68k/Kconfig
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@ -7,6 +7,7 @@ config M68K
select GENERIC_IRQ_SHOW
select ARCH_HAVE_NMI_SAFE_CMPXCHG if RMW_INSNS
select GENERIC_CPU_DEVICES
select FPU if MMU
config RWSEM_GENERIC_SPINLOCK
bool
@ -64,6 +65,9 @@ config CPU_HAS_NO_MULDIV64
config CPU_HAS_ADDRESS_SPACES
bool
config FPU
bool
config HZ
int
default 1000 if CLEOPATRA