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core: introduce NORMALIZED_ARCH as non-kernel replacement for KERNEL_ARCH

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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>
This commit is contained in:
Thomas De Schampheleire
2022-01-15 21:03:00 +01:00
committed by Arnout Vandecappelle (Essensium/Mind)
parent cf198e2299
commit dd8a410eaf
29 changed files with 45 additions and 44 deletions
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10
boot/barebox/barebox.mk
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@@ -59,16 +59,16 @@ ifneq ($$(BR2_TARGET_$(1)_BAREBOXENV),y)
$(1)_INSTALL_TARGET = NO
endif
ifeq ($$(KERNEL_ARCH),i386)
ifeq ($$(NORMALIZED_ARCH),i386)
$(1)_ARCH = x86
else ifeq ($$(KERNEL_ARCH),x86_64)
else ifeq ($$(NORMALIZED_ARCH),x86_64)
$(1)_ARCH = x86
else ifeq ($$(KERNEL_ARCH),powerpc)
else ifeq ($$(NORMALIZED_ARCH),powerpc)
$(1)_ARCH = ppc
else ifeq ($$(KERNEL_ARCH),arm64)
else ifeq ($$(NORMALIZED_ARCH),arm64)
$(1)_ARCH = arm
else
$(1)_ARCH = $$(KERNEL_ARCH)
$(1)_ARCH = $$(NORMALIZED_ARCH)
endif
$(1)_MAKE_FLAGS = ARCH=$$($(1)_ARCH) CROSS_COMPILE="$$(TARGET_CROSS)"