isa_defs.h: fix freebsd loongarch compilation errors("ISA not support…

[haowuge]

Motivation and Context

Attempting to port freebsd to loongarch architecture, compilation error occurred

Description

Added LoongArch related code with reference to RISC-V

How Has This Been Tested?

===> libsa (all)
mkdir -p xlocale arpa;  for i in a.out.h assert.h elf.h inttypes.h limits.h nlist.h setjmp.h stddef.h stdbool.h string.h strings.h time.h unistd.h uuid.h; do  ln -sf /usr/src/include/$i $i;  done;  ln -sf /usr/src/sys/loongarch/include/stdarg.h stdarg.h;  ln -sf /usr/src/sys/sys/errno.h errno.h;  ln -sf /usr/src/sys/sys/stdint.h stdint.h;  ln -sf /usr/src/include/arpa/inet.h arpa/inet.h;  ln -sf /usr/src/include/arpa/tftp.h arpa/tftp.h;  for i in _time.h _strings.h _string.h; do  [ -f xlocale/$i ] || :> xlocale/$i;  done;  for i in ctype.h fcntl.h signal.h stdio.h stdlib.h; do  ln -sf /usr/src/stand/libsa/stand.h $i;  done
/usr/local/bin/ccache cc -target loongarch64-unknown-freebsd14.2 --sysroot=/usr/obj/usr/src/loongarch.loongarch64/tmp -B/usr/obj/usr/src/loongarch.loongarch64/tmp/usr/bin -ftls-model=initial-exec -O2 -pipe -fno-common -march=loongarch64 -mabi=lp64d   -nostdinc  -I/usr/src/stand/libsa/zfs/spl                                  -I/usr/src/sys/contrib/openzfs/include/os/freebsd                   -I/usr/src/sys/contrib/openzfs/include/os/freebsd/spl                            -I/usr/src/sys/contrib/openzfs/include/os/freebsd/zfs  -I/usr/obj/usr/src/loongarch.loongarch64/stand/libsa -I/usr/src/stand/libsa -D_STANDALONE -I/usr/src/sys -Ddouble=jagged-little-pill -Dfloat=floaty-mcfloatface -DLOADER_GELI_SUPPORT -I/usr/src/stand/libsa/geli -DLOADER_DISK_SUPPORT -ffreestanding  -march=loongarch64 -mabi=lp64d -fPIC -mno-relax -I. -Iinclude -g -gz=zlib -MD  -MF.depend.zfs_zstd.o -MTzfs_zstd.o -std=gnu99 -Wno-format-zero-length -Wsystem-headers -Werror -Wno-pointer-sign -Wdate-time -Wno-empty-body -Wno-string-plus-int -Wno-unused-const-variable -Wno-error=unused-but-set-parameter -Wno-tautological-compare -Wno-unused-value -Wno-parentheses-equality -Wno-unused-function -Wno-enum-conversion -Wno-unused-local-typedef -Wno-address-of-packed-member -Wno-switch -Wno-switch-enum -Wno-knr-promoted-parameter -Wno-parentheses  -Qunused-arguments -include /usr/src/sys/contrib/openzfs/include/os/freebsd/spl/sys/ccompile.h -Wformat -Wall -I/usr/src/sys/contrib/openzfs/include  -DNEED_SOLARIS_BOOLEAN -DIN_BASE -DIN_LIBSA   -c /usr/src/sys/contrib/openzfs/module/zstd/zfs_zstd.c -o zfs_zstd.o
In file included from /usr/src/sys/contrib/openzfs/module/zstd/zfs_zstd.c:43:
In file included from /usr/src/sys/contrib/openzfs/include/os/freebsd/spl/sys/sysmacros.h:35:
/usr/src/sys/contrib/openzfs/include/os/freebsd/spl/sys/isa_defs.h:288:2: error: "ISA not supported"
  288 | #error "ISA not supported"
      |  ^
1 error generated.
*** Error code 1

Stop.
make[3]: stopped in /usr/src/stand/libsa
*** Error code 1

Stop.
make[2]: stopped in /usr/src/stand

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Performance enhancement (non-breaking change which improves efficiency)
• Code cleanup (non-breaking change which makes code smaller or more readable)
• Breaking change (fix or feature that would cause existing functionality to change)
• Library ABI change (libzfs, libzfs_core, libnvpair, libuutil and libzfsbootenv)
• Documentation (a change to man pages or other documentation)

Checklist:

• My code follows the OpenZFS code style requirements.
• I have updated the documentation accordingly.
• I have read the contributing document.
• I have added tests to cover my changes.
• I have run the ZFS Test Suite with this change applied.
• All commit messages are properly formatted and contain Signed-off-by.

[snajpa]

checkstyle says

error: missing "Signed-off-by"
error: commit message body contains line over 72 characters

but what I really wanted - you can ignore the replacement/resilver_restart_001 failure, I have no idea why FreeBSD 14+ acts differently from the rest of the pack, will need to figure this out. But it might take a few days before I can get to this. If anyone could get me zfs_dbgmsg after that failure that would be most awesome :) (ref: #16822)

[haowuge]

checkstyle says

error: missing "Signed-off-by"
error: commit message body contains line over 72 characters

I have resubmitted.

but what I really wanted - you can ignore the replacement/resilver_restart_001 failure, I have no idea why FreeBSD 14+ acts differently from the rest of the pack, will need to figure this out. But it might take a few days before I can get to this. If anyone could get me zfs_dbgmsg after that failure that would be most awesome :) (ref: #16822)

I am unable to run resilver_restart_001
View details ref: #16822

[amotin]

On Linux this line is spelled as #elif defined(__loongarch__) && defined(__loongarch_lp64). Should here be the same or lp64 is the only option there now and forever?

[haowuge]

Thank you for your suggestion. I have updated the code to be consistent with the Linux version.
It compiles successfully (the porting work is not yet complete, and it has not been tested for normal operation).
Currently, Loongson has not released any high-performance devices using loongarch32 (compared to desktop or server hardware),
so 32-bit loongarch can actually be temporarily disregarded.

[amotin]

Though the question now is whether __loongarch_lp64 will be defined on FreeBSD. So far is is not. I can see only __loongarch__. So it feels like we need OS side to stabilize first.

[haowuge]

ok

[RevySR]

Does freebsd-kernel already support loongarch? There is no mailing list for it.

Can you provide information about freebsd loongarch support?

[haowuge]

Does freebsd-kernel already support loongarch? There is no mailing list for it.

Can you provide information about freebsd loongarch support?

We are working hard to make it a reality.
Currently, loader.efi is ready to run.
(The loader.efi dependency contains zfs)

https://haowuge.github.io/pull_requests_images/2024-12-01/2024-12-01_21-09-35.mkv