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kconfig: Improve architecture floating point symbol descriptions

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This commit reworks the symbol descriptions for `CONFIG_FPU` and
`CONFIG_FP_SHARING`, in order to provide more details and clarify any
ambiguity between the two symbols.

Signed-off-by: Stephanos Ioannidis <root@stephanos.io>
This commit is contained in:
Stephanos Ioannidis 2020-04-24 14:06:37 +09:00 • committed by Carles Cufí
commit 4f4e85c035
1 changed files with 24 additions and 9 deletions
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arch/Kconfig
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@ -520,23 +520,38 @@ config MPU_GAP_FILLING
documentation for more information on how this option is documentation for more information on how this option is
used. used.
menuconfig FPU menu "Floating Point Options"
bool "Floating point"
config FPU
bool "Enable floating point unit (FPU)"
depends on CPU_HAS_FPU depends on CPU_HAS_FPU
depends on ARC || ARM || RISCV || X86 depends on ARC || ARM || RISCV || X86
help help
This option allows threads to use the floating point registers. This option enables the hardware Floating Point Unit (FPU), in order to
By default, only a single thread may use the registers. support using the floating point registers and instructions.
Disabling this option means that any thread that uses a When this option is enabled, by default, threads may use the floating
floating point register will get a fatal exception. point registers only in an exclusive manner, and this usually means that
only one thread may perform floating point operations.
If it is necessary for multiple threads to perform concurrent floating
point operations, the "FPU register sharing" option must be enabled to
preserve the floating point registers across context switches.
Note that this option cannot be selected for the platforms that do not
include a hardware floating point unit; the floating point support for
those platforms is dependent on the availability of the toolchain-
provided software floating point library.
config FP_SHARING config FP_SHARING
bool "Floating point register sharing" bool "FPU register sharing"
depends on FPU depends on FPU
help help
This option allows multiple threads to use the floating point This option enables preservation of the hardware floating point registers
registers. across context switches to allow multiple threads to perform concurrent
floating point operations.
endmenu
config ARCH config ARCH
string string