1 # SPDX-License-Identifier: GPL-2.0 2 menu "Processor features" 3 4 choice 5 prompt "Endianness selection" 6 default CPU_LITTLE_ENDIAN 7 help 8 Some SuperH machines can be configured for either little or big 9 endian byte order. These modes require different kernels. 10 11 config CPU_LITTLE_ENDIAN 12 bool "Little Endian" 13 14 config CPU_BIG_ENDIAN 15 bool "Big Endian" 16 17 endchoice 18 19 config SH_FPU 20 def_bool y 21 prompt "FPU support" 22 depends on CPU_HAS_FPU 23 help 24 Selecting this option will enable support for SH processors that 25 have FPU units (ie, SH77xx). 26 27 This option must be set in order to enable the FPU. 28 29 config SH_FPU_EMU 30 def_bool n 31 prompt "FPU emulation support" 32 depends on !SH_FPU 33 help 34 Selecting this option will enable support for software FPU emulation. 35 Most SH-3 users will want to say Y here, whereas most SH-4 users will 36 want to say N. 37 38 config SH_DSP 39 def_bool y 40 prompt "DSP support" 41 depends on CPU_HAS_DSP 42 help 43 Selecting this option will enable support for SH processors that 44 have DSP units (ie, SH2-DSP, SH3-DSP, and SH4AL-DSP). 45 46 This option must be set in order to enable the DSP. 47 48 config SH_ADC 49 def_bool y 50 prompt "ADC support" 51 depends on CPU_SH3 52 help 53 Selecting this option will allow the Linux kernel to use SH3 on-chip 54 ADC module. 55 56 If unsure, say N. 57 58 config SH_STORE_QUEUES 59 bool "Support for Store Queues" 60 depends on CPU_SH4 61 help 62 Selecting this option will enable an in-kernel API for manipulating 63 the store queues integrated in the SH-4 processors. 64 65 config SPECULATIVE_EXECUTION 66 bool "Speculative subroutine return" 67 depends on CPU_SUBTYPE_SH7780 || CPU_SUBTYPE_SH7785 || CPU_SUBTYPE_SH7786 68 help 69 This enables support for a speculative instruction fetch for 70 subroutine return. There are various pitfalls associated with 71 this, as outlined in the SH7780 hardware manual. 72 73 If unsure, say N. 74 75 config CPU_HAS_INTEVT 76 bool 77 78 config CPU_HAS_IPR_IRQ 79 bool 80 81 config CPU_HAS_SR_RB 82 bool 83 help 84 This will enable the use of SR.RB register bank usage. Processors 85 that are lacking this bit must have another method in place for 86 accomplishing what is taken care of by the banked registers. 87 88 See <file:Documentation/arch/sh/register-banks.rst> for further 89 information on SR.RB and register banking in the kernel in general. 90 91 config CPU_HAS_PTEAEX 92 bool 93 94 config CPU_HAS_DSP 95 bool 96 97 config CPU_HAS_FPU 98 bool 99 100 endmenu 101