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buildroot/arch/Config.in.mips
Thomas De Schampheleire dd8a410eaf core: introduce NORMALIZED_ARCH as non-kernel replacement for KERNEL_ARCH 
The variable 'KERNEL_ARCH' is actually a normalized version of
'ARCH'/'BR2_ARCH'. For example, 'arcle' and 'arceb' both become 'arc', just
as all powerpc variants become 'powerpc'.

It is presumably called 'KERNEL_ARCH' because the Linux kernel is typically
the first place where support for a new architecture is added, and thus is
the entity that defines the normalized name.

However, the term 'KERNEL_ARCH' can also be interpreted as 'the architecture
used by the kernel', which need not be exactly the same as 'the normalized
name for a certain arch'. In particular, for cases where a 64-bit
architecture is running a 64-bit kernel but 32-bit userspace. Examples
include:
    * aarch64 architecture, with aarch64 kernel and 32-bit (ARM) userspace
    * x86_64 architecture, with x86_64 kernel and 32-bit (i386) userspace

In such cases, the 'architecture used by the kernel' needs to refer to the
64-bit name (aarch64, x86_64), whereas all userspace applications need to
refer the, potentially normalized, 32-bit name.

This means that there need to be two different variables:

KERNEL_ARCH:     the architecture used by the kernel
NORMALIZED_ARCH: the normalized name for the current userspace architecture

At this moment, both will actually have the same content. But a subsequent
patch will add basic support for situations described above, in which
KERNEL_ARCH may become overwritten to the 64-bit architecture, while
NORMALIZED_ARCH needs to remain the same (32-bit) case.

This commit replaces use of KERNEL_ARCH where actually the userspace arch is
needed.  Places that use KERNEL_ARCH in combination with building of kernel
modules are not touched.
There may be cases where a package builds both a kernel module as userspace,
in which case it may need to know about both KERNEL_ARCH and
NORMALIZED_ARCH, for the case where they differ. But this is to be fixed on
a per-need basis.

Signed-off-by: Thomas De Schampheleire <thomas.de_schampheleire@nokia.com>
Reviewed-by: Romain Naour <romain.naour@gmail.com>
[Arnout: Also rename BR2_KERNEL_ARCH to BR2_NORMALIZED_ARCH]
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
2022-02-08 21:20:23 +01:00

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# mips default CPU ISAs
config BR2_MIPS_CPU_MIPS32
bool
select BR2_MIPS_NAN_LEGACY
config BR2_MIPS_CPU_MIPS32R2
bool
select BR2_MIPS_NAN_LEGACY
config BR2_MIPS_CPU_MIPS32R3
bool
select BR2_MIPS_NAN_LEGACY
config BR2_MIPS_CPU_MIPS32R5
bool
select BR2_ARCH_NEEDS_GCC_AT_LEAST_5
config BR2_MIPS_CPU_MIPS32R6
bool
select BR2_MIPS_NAN_2008
select BR2_ARCH_NEEDS_GCC_AT_LEAST_5
config BR2_MIPS_CPU_MIPS64
bool
select BR2_MIPS_NAN_LEGACY
config BR2_MIPS_CPU_MIPS64R2
bool
select BR2_MIPS_NAN_LEGACY
config BR2_MIPS_CPU_MIPS64R3
bool
select BR2_MIPS_NAN_LEGACY
config BR2_MIPS_CPU_MIPS64R5
bool
select BR2_ARCH_NEEDS_GCC_AT_LEAST_5
config BR2_MIPS_CPU_MIPS64R6
bool
select BR2_MIPS_NAN_2008
select BR2_ARCH_NEEDS_GCC_AT_LEAST_5
choice
prompt "Target Architecture Variant"
default BR2_mips_32 if BR2_mips || BR2_mipsel
default BR2_mips_64 if BR2_mips64 || BR2_mips64el
depends on BR2_mips || BR2_mipsel || BR2_mips64 || BR2_mips64el
help
Specific CPU variant to use
64bit capable: 64, 64r2, 64r3, 64r5, 64r6
non-64bit capable: 32, 32r2, 32r3, 32r5, 32r6
config BR2_mips_32
bool "Generic MIPS32"
depends on !BR2_ARCH_IS_64
select BR2_MIPS_CPU_MIPS32
config BR2_mips_32r2
bool "Generic MIPS32R2"
depends on !BR2_ARCH_IS_64
select BR2_MIPS_CPU_MIPS32R2
config BR2_mips_32r3
bool "Generic MIPS32R3"
depends on !BR2_ARCH_IS_64
select BR2_MIPS_CPU_MIPS32R3
config BR2_mips_32r5
bool "Generic MIPS32R5"
depends on !BR2_ARCH_IS_64
select BR2_MIPS_CPU_MIPS32R5
config BR2_mips_32r6
bool "Generic MIPS32R6"
depends on !BR2_ARCH_IS_64
select BR2_MIPS_CPU_MIPS32R6
config BR2_mips_interaptiv
bool "interAptiv"
depends on !BR2_ARCH_IS_64
select BR2_MIPS_CPU_MIPS32R2
select BR2_ARCH_NEEDS_GCC_AT_LEAST_6
config BR2_mips_m5150
bool "M5150"
depends on !BR2_ARCH_IS_64
select BR2_MIPS_CPU_MIPS32R5
select BR2_MIPS_NAN_2008
select BR2_ARCH_NEEDS_GCC_AT_LEAST_6
config BR2_mips_m6250
bool "M6250"
depends on !BR2_ARCH_IS_64
select BR2_ARCH_HAS_NO_TOOLCHAIN_BUILDROOT
select BR2_MIPS_CPU_MIPS32R6
config BR2_mips_p5600
bool "P5600"
depends on !BR2_ARCH_IS_64
select BR2_MIPS_CPU_MIPS32R5
select BR2_MIPS_NAN_2008
config BR2_mips_xburst
bool "XBurst"
depends on !BR2_ARCH_IS_64
select BR2_MIPS_CPU_MIPS32R2
help
The Ingenic XBurst is a MIPS32R2 microprocessor. It has a
bug in the FPU that can generate incorrect results in
certain cases. The problem shows up when you have several
fused madd instructions in sequence with dependant
operands. This requires the -mno-fused-madd compiler option
to be used in order to prevent emitting these instructions.
See http://www.ingenic.com/en/?xburst.html
config BR2_mips_64
bool "Generic MIPS64"
depends on BR2_ARCH_IS_64
select BR2_MIPS_CPU_MIPS64
config BR2_mips_64r2
bool "Generic MIPS64R2"
depends on BR2_ARCH_IS_64
select BR2_MIPS_CPU_MIPS64R2
config BR2_mips_64r3
bool "Generic MIPS64R3"
depends on BR2_ARCH_IS_64
select BR2_MIPS_CPU_MIPS64R3
config BR2_mips_64r5
bool "Generic MIPS64R5"
depends on BR2_ARCH_IS_64
select BR2_MIPS_CPU_MIPS64R5
config BR2_mips_64r6
bool "Generic MIPS64R6"
depends on BR2_ARCH_IS_64
select BR2_MIPS_CPU_MIPS64R6
config BR2_mips_i6400
bool "I6400"
depends on BR2_ARCH_IS_64
select BR2_MIPS_CPU_MIPS64R6
select BR2_ARCH_NEEDS_GCC_AT_LEAST_6
config BR2_mips_octeon2
bool "Octeon II"
depends on BR2_ARCH_IS_64
select BR2_MIPS_CPU_MIPS64R2
help
Marvell (formerly Cavium Networks) Octeon II CN60XX
processors.
config BR2_mips_octeon3
bool "Octeon III"
depends on BR2_ARCH_IS_64
select BR2_MIPS_CPU_MIPS64R3
help
Marvell (formerly Cavium Networks) Octeon III CN7XXX
processors.
config BR2_mips_p6600
bool "P6600"
depends on BR2_ARCH_IS_64
select BR2_ARCH_HAS_NO_TOOLCHAIN_BUILDROOT
select BR2_MIPS_CPU_MIPS64R6
endchoice
choice
prompt "Target ABI"
default BR2_MIPS_NABI32
depends on BR2_mips64 || BR2_mips64el
help
Application Binary Interface to use
config BR2_MIPS_NABI32
bool "n32"
depends on BR2_ARCH_IS_64
select BR2_KERNEL_64_USERLAND_32
config BR2_MIPS_NABI64
bool "n64"
depends on BR2_ARCH_IS_64
endchoice
config BR2_MIPS_SOFT_FLOAT
bool "Use soft-float"
default y
depends on !BR2_mips_octeon3 # hard-float only
select BR2_SOFT_FLOAT
help
If your target CPU does not have a Floating Point Unit (FPU)
or a kernel FPU emulator, but you still wish to support
floating point functions, then everything will need to be
compiled with soft floating point support (-msoft-float).
choice
prompt "FP mode"
default BR2_MIPS_FP32_MODE_XX
depends on !BR2_ARCH_IS_64 && !BR2_MIPS_SOFT_FLOAT
help
MIPS32 supports different FP modes (32,xx,64). Information
about FP modes can be found here:
https://sourceware.org/binutils/docs/as/MIPS-Options.html
https://dmz-portal.imgtec.com/wiki/MIPS_O32_ABI_-_FR0_and_FR1_Interlinking#5._Generating_modeless_code
config BR2_MIPS_FP32_MODE_32
bool "32"
depends on !BR2_MIPS_CPU_MIPS32R6
config BR2_MIPS_FP32_MODE_XX
bool "xx"
select BR2_ARCH_NEEDS_GCC_AT_LEAST_5
config BR2_MIPS_FP32_MODE_64
bool "64"
depends on !BR2_MIPS_CPU_MIPS32
endchoice
config BR2_GCC_TARGET_FP32_MODE
default "32" if BR2_MIPS_FP32_MODE_32
default "xx" if BR2_MIPS_FP32_MODE_XX
default "64" if BR2_MIPS_FP32_MODE_64
config BR2_MIPS_NAN_LEGACY
bool
config BR2_MIPS_NAN_2008
bool
select BR2_ARCH_NEEDS_GCC_AT_LEAST_4_9
choice
prompt "Target NaN"
default BR2_MIPS_ENABLE_NAN_2008
depends on BR2_mips_32r5 || BR2_mips_64r5
help
MIPS supports two different NaN encodings, legacy and 2008.
Information about MIPS NaN encodings can be found here:
https://sourceware.org/binutils/docs/as/MIPS-NaN-Encodings.html
config BR2_MIPS_ENABLE_NAN_LEGACY
bool "legacy"
select BR2_MIPS_NAN_LEGACY
config BR2_MIPS_ENABLE_NAN_2008
bool "2008"
depends on !BR2_MIPS_SOFT_FLOAT
select BR2_MIPS_NAN_2008
endchoice
config BR2_GCC_TARGET_NAN
default "legacy" if BR2_MIPS_NAN_LEGACY
default "2008" if BR2_MIPS_NAN_2008
config BR2_ARCH
default "mips" if BR2_mips
default "mipsel" if BR2_mipsel
default "mips64" if BR2_mips64
default "mips64el" if BR2_mips64el
config BR2_NORMALIZED_ARCH
default "mips"
config BR2_ENDIAN
default "LITTLE" if BR2_mipsel || BR2_mips64el
default "BIG" if BR2_mips || BR2_mips64
config BR2_GCC_TARGET_ARCH
default "mips32" if BR2_mips_32
default "mips32r2" if BR2_mips_32r2
default "mips32r3" if BR2_mips_32r3
default "mips32r5" if BR2_mips_32r5
default "mips32r6" if BR2_mips_32r6
default "interaptiv" if BR2_mips_interaptiv
default "m5101" if BR2_mips_m5150
default "m6201" if BR2_mips_m6250
default "p5600" if BR2_mips_p5600
default "mips32r2" if BR2_mips_xburst
default "mips64" if BR2_mips_64
default "mips64r2" if BR2_mips_64r2
default "mips64r3" if BR2_mips_64r3
default "mips64r5" if BR2_mips_64r5
default "mips64r6" if BR2_mips_64r6
default "i6400" if BR2_mips_i6400
default "octeon2" if BR2_mips_octeon2
default "octeon3" if BR2_mips_octeon3
default "p6600" if BR2_mips_p6600
config BR2_MIPS_OABI32
bool
default y if BR2_mips || BR2_mipsel
config BR2_GCC_TARGET_ABI
default "32" if BR2_MIPS_OABI32
default "n32" if BR2_MIPS_NABI32
default "64" if BR2_MIPS_NABI64
config BR2_READELF_ARCH_NAME
default "MIPS R3000"
# vim: ft=kconfig
# -*- mode:kconfig; -*-
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