dd8a410eaf
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>
140 lines
2.9 KiB
Plaintext
140 lines
2.9 KiB
Plaintext
# RISC-V CPU ISA extensions.
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config BR2_RISCV_ISA_RVI
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bool
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config BR2_RISCV_ISA_RVM
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bool
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config BR2_RISCV_ISA_RVA
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bool
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config BR2_RISCV_ISA_RVF
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bool
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config BR2_RISCV_ISA_RVD
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bool
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config BR2_RISCV_ISA_RVC
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bool
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choice
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prompt "Target Architecture Variant"
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default BR2_riscv_g
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config BR2_riscv_g
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bool "General purpose (G)"
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select BR2_RISCV_ISA_RVI
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select BR2_RISCV_ISA_RVM
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select BR2_RISCV_ISA_RVA
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select BR2_RISCV_ISA_RVF
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select BR2_RISCV_ISA_RVD
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help
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General purpose (G) is equivalent to IMAFD.
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config BR2_riscv_custom
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bool "Custom architecture"
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select BR2_RISCV_ISA_RVI
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select BR2_RISCV_ISA_CUSTOM_RVA
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endchoice
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if BR2_riscv_custom
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comment "Instruction Set Extensions"
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config BR2_RISCV_ISA_CUSTOM_RVM
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bool "Integer Multiplication and Division (M)"
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select BR2_RISCV_ISA_RVM
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config BR2_RISCV_ISA_CUSTOM_RVA
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bool "Atomic Instructions (A)"
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select BR2_RISCV_ISA_RVA
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config BR2_RISCV_ISA_CUSTOM_RVF
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bool "Single-precision Floating-point (F)"
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select BR2_RISCV_ISA_RVF
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config BR2_RISCV_ISA_CUSTOM_RVD
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bool "Double-precision Floating-point (D)"
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depends on BR2_RISCV_ISA_RVF
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select BR2_RISCV_ISA_RVD
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config BR2_RISCV_ISA_CUSTOM_RVC
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bool "Compressed Instructions (C)"
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select BR2_RISCV_ISA_RVC
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endif
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choice
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prompt "Target Architecture Size"
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default BR2_RISCV_64
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config BR2_RISCV_32
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bool "32-bit"
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select BR2_ARCH_HAS_MMU_MANDATORY
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config BR2_RISCV_64
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bool "64-bit"
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select BR2_ARCH_IS_64
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select BR2_ARCH_HAS_MMU_OPTIONAL
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endchoice
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choice
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prompt "Target ABI"
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default BR2_RISCV_ABI_ILP32D if !BR2_ARCH_IS_64 && BR2_RISCV_ISA_RVD
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default BR2_RISCV_ABI_ILP32F if !BR2_ARCH_IS_64 && BR2_RISCV_ISA_RVF
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default BR2_RISCV_ABI_ILP32 if !BR2_ARCH_IS_64
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default BR2_RISCV_ABI_LP64D if BR2_ARCH_IS_64 && BR2_RISCV_ISA_RVD
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default BR2_RISCV_ABI_LP64F if BR2_ARCH_IS_64 && BR2_RISCV_ISA_RVF
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default BR2_RISCV_ABI_LP64 if BR2_ARCH_IS_64
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config BR2_RISCV_ABI_ILP32
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bool "ilp32"
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depends on !BR2_ARCH_IS_64
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config BR2_RISCV_ABI_ILP32F
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bool "ilp32f"
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depends on !BR2_ARCH_IS_64 && BR2_RISCV_ISA_RVF
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config BR2_RISCV_ABI_ILP32D
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bool "ilp32d"
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depends on !BR2_ARCH_IS_64 && BR2_RISCV_ISA_RVD
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config BR2_RISCV_ABI_LP64
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bool "lp64"
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depends on BR2_ARCH_IS_64
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config BR2_RISCV_ABI_LP64F
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bool "lp64f"
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depends on BR2_ARCH_IS_64 && BR2_RISCV_ISA_RVF
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config BR2_RISCV_ABI_LP64D
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bool "lp64d"
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depends on BR2_ARCH_IS_64 && BR2_RISCV_ISA_RVD
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endchoice
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config BR2_ARCH
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default "riscv32" if !BR2_ARCH_IS_64
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default "riscv64" if BR2_ARCH_IS_64
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config BR2_NORMALIZED_ARCH
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default "riscv"
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config BR2_ENDIAN
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default "LITTLE"
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config BR2_GCC_TARGET_ABI
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default "ilp32" if BR2_RISCV_ABI_ILP32
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default "ilp32f" if BR2_RISCV_ABI_ILP32F
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default "ilp32d" if BR2_RISCV_ABI_ILP32D
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default "lp64" if BR2_RISCV_ABI_LP64
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default "lp64f" if BR2_RISCV_ABI_LP64F
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default "lp64d" if BR2_RISCV_ABI_LP64D
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config BR2_READELF_ARCH_NAME
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default "RISC-V"
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# vim: ft=kconfig
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# -*- mode:kconfig; -*-
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