nuttx/libs/libc/machine/Kconfig

#
# For a description of the syntax of this configuration file,
# see the file kconfig-language.txt in the NuttX tools repository.
#

# These are library functions that may be overriden by architecture-
# specific implementations.  Not all architectures support implementations
# for every library function.

menu "Architecture-Specific Support"

config ARCH_LOWPUTC
	bool "Low-level console output"
	default "y"
	---help---
		architecture supports low-level, boot time console output

config ARCH_ROMGETC
	bool "Support for ROM string access"
	default n
	---help---
		In Harvard architectures, data accesses and instruction accesses
		occur on different buses, perhaps concurrently.  All data accesses
		are performed on the data bus unless special machine instructions
		are used to read data from the instruction address space.  Also, in
		the typical MCU, the available SRAM data memory is much smaller that
		the non-volatile FLASH instruction memory.  So if the application
		requires many constant strings, the only practical solution may be
		to store those constant strings in FLASH memory where they can only
		be accessed using architecture-specific machine instructions.

		If ARCH_ROMGETC is defined, then the architecture logic must export
		the function up_romgetc().  up_romgetc() will simply read one byte
		of data from the instruction space.

		If ARCH_ROMGETC is selected, certain C stdio functions are effected: (1)
		All format strings in printf, fprintf, sprintf, etc. are assumed to lie
		in FLASH (string arguments for %s are still assumed to reside in SRAM).
		And (2), the string argument to puts and fputs is assumed to reside
		in FLASH.  Clearly, these assumptions may have to modified for the
		particular needs of your environment.  There is no "one-size-fits-all"
		solution for this problem.

# Default settings for C library functions that may be replaced with
# architecture-specific versions.

config LIBC_ARCH_MEMCPY
	bool
	default n

config LIBC_ARCH_MEMCMP
	bool
	default n

config LIBC_ARCH_MEMMOVE
	bool
	default n

config LIBC_ARCH_MEMSET
	bool
	default n

config LIBC_ARCH_STRCHR
	bool
	default n

config LIBC_ARCH_STRCMP
	bool
	default n

config LIBC_ARCH_STRCPY
	bool
	default n

config LIBC_ARCH_STRLCPY
	bool
	default n

config LIBC_ARCH_STRNCPY
	bool
	default n

config LIBC_ARCH_STRLEN
	bool
	default n

config LIBC_ARCH_STRNLEN
	bool
	default n

config LIBC_ARCH_ELF
	bool
	default n

config LIBC_ARCH_ELF_64BIT
	bool
	default n
	depends on LIBC_ARCH_ELF

config LIBM_ARCH_CEIL
	bool
	default n
	depends on LIBM

config LIBM_ARCH_FLOOR
	bool
	default n
	depends on LIBM

config LIBM_ARCH_NEARBYINT
	bool
	default n
	depends on LIBM

config LIBM_ARCH_RINT
	bool
	default n
	depends on LIBM

config LIBM_ARCH_ROUND
	bool
	default n
	depends on LIBM

config LIBM_ARCH_TRUNC
	bool
	default n
	depends on LIBM

config LIBM_ARCH_CEILF
	bool
	default n
	depends on LIBM

config LIBM_ARCH_FLOORF
	bool
	default n
	depends on LIBM

config LIBM_ARCH_NEARBYINTF
	bool
	default n
	depends on LIBM

config LIBM_ARCH_RINTF
	bool
	default n
	depends on LIBM

config LIBM_ARCH_ROUNDF
	bool
	default n
	depends on LIBM

config LIBM_ARCH_TRUNCF
	bool
	default n
	depends on LIBM

# One or more the of above may be selected by architecture specific logic

if ARCH_ARM
source libs/libc/machine/arm/Kconfig
endif
if ARCH_RISCV
source libs/libc/machine/risc-v/Kconfig
endif
if ARCH_SIM
source libs/libc/machine/sim/Kconfig
endif
if ARCH_X86
source libs/libc/machine/x86/Kconfig
endif
if ARCH_XTENSA
source libs/libc/machine/xtensa/Kconfig
endif

endmenu # Architecture-Specific Support