112 lines
3.6 KiB
Plaintext
112 lines
3.6 KiB
Plaintext
source "arch/x86/core/Kconfig"
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source "arch/x86/bsp/Kconfig"
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menu "Floating Point Options"
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depends on !CPU_FLOAT_UNSUPPORTED
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config FLOAT
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bool
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prompt "Floating point instructions"
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default n
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select FP_SHARING if ENHANCED_SECURITY
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help
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This option enables the use of x87 FPU and MMX instructions by
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a task or fiber.
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Disabling this option means that any task or fiber that uses a
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floating point instruction will get a fatal exception.
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config SSE
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bool
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prompt "SSEx instructions"
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depends on FLOAT && !CPU_SSE_UNSUPPORTED
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default n
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help
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This option enables the use of SSEx instructions by a task or fiber.
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Disabling this option means that no task or fiber may use SSEx
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instructions; any such use will result in undefined behavior.
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config SSE_FP_MATH
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bool
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prompt "Compiler-generated SSEx instructions" if FP_SHARING
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depends on SSE && ISA_IA32
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default n if FP_SHARING
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default y if !FP_SHARING
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help
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This option allows the compiler to generate SSEx instructions for
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performing floating point math. This can greatly improve performance
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when exactly the same operations are to be performed on multiple
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data objects; however, it can also significantly reduce performance
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when pre-emptive task switches occur because of the larger register
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set that must be saved and restored.
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Disabling this option means that the compiler utilizes only the
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x87 instruction set for floating point operations.
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config FP_SHARING
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bool
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prompt "Floating point resource sharing" if !ENHANCED_SECURITY
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depends on FLOAT
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default n
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select AUTOMATIC_FP_ENABLING if ENHANCED_SECURITY
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help
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This option allows multiple tasks and fibers to safely utilize
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floating point hardware resources. Every task or fiber that wishes
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to use floating point instructions (i.e. x87 FPU, MMX, or SSEx) must
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be created with such support already enabled, or must enable this
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support via task_float_enable() or fiber_float_enable() before
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executing these instructions.
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Enabling this option adds 108 bytes to the stack size requirement
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of each task or fiber that utilizes x87 FPU or MMX instructions,
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and adds 464 bytes to the stack size requirement of each task or
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fiber that utilizes SSEx instructions. (The stack size requirement
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of tasks and fibers that do not utilize floating point instructions
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remains unchanged.)
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Disabling this option means that only a single task or fiber may
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utilize x87 FPU, MMX, or SSEx instructions. (The stack size
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requirement of all tasks and fibers remains unchanged.)
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config AUTOMATIC_FP_ENABLING
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bool
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prompt "Automatically enable floating point resource sharing" \
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if !ENHANCED_SECURITY
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depends on FP_SHARING
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default n
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help
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This option allows tasks and fibers to safely utilize floating
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point hardware resources without requiring them to first indicate
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their intention to do so. The system automatically detects when
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a task or fiber that does not currently have floating point support
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enabled uses a floating point instruction, and automatically executes
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task_float_enable() or fiber_float_enable() on its behalf. The
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task or fiber is enabled for using x87 FPU, MMX, or SSEx instructions
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if SSE is configured, otherwise it is enabled for using x87 FPU or
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MMX instructions only.
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config XIP
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default n
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endmenu
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#FIXME This symbols is not being used.
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config CUSTOM_RANDOM_GENERATOR
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bool "Custom randmon generator"
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default n
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help
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This option signifies that the target uses custom random number
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generator.
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if BSP_GENERIC_PC
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source "arch/x86/generic_pc/Kconfig"
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endif
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if BSP_QUARK
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source "arch/x86/quark/Kconfig"
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endif
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source "arch/x86/timer/Kconfig"
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source "arch/x86/interrupt_controller/Kconfig"
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