- It should be fine to enable pmull always on Apple Silicon
- macOS 12+ is required for PMULL instruction.
- Changed the conditional macro to __APPLE__
- Rewritten dispatcher using sysctlbyname
- Use __USER_LABEL_PREFIX__
- Use __TEXT,__const as readonly section
- use ASM_DEF_RODATA macro
- fix func decl
Change-Id: I800593f21085d8187b480c8bb3ab2bd70c4a6974
Signed-off-by: Taiju Yamada <tyamada@bi.a.u-tokyo.ac.jp>
This patch provides microarchitecture information
and make microarchitecture optimization possible. It
will trap into kernel due to mrs instruction. So it
should be called only in dispatcher, that will be
called only once in program lifecycle. And HWCAP must
be match,That will make sure there are no illegal
instruction errors.
Change-Id: I393ec742010bf3f10ce335482c0350aa4202c788
Signed-off-by: Jerry Yu <jerry.h.yu@arm.com>
with -Wstric-prototype option , GCC report the
warning .
Change-Id: Ic2d1adb566ad21deec65c66552e2863254e1376a
Signed-off-by: Jerry Yu <jerry.h.yu@arm.com>
- Add dispatcher layer
- Alias functions with assmebly
Change-Id: I84da1be539d890db0df64e5ea989b2fd1f276949
Signed-off-by: Jerry Yu <jerry.h.yu@arm.com>
Some CPUs report "illegal instruction" error for the crc test because
they do not support the relevant optional feature . This can be fixed by
introducing CPU feature detection for AArch64 .
The difference with the x86 implementation is the dispatcher . It is based
on the glibc function `getauxval(AT_HWCAP)` and `getauxval(AT_HWCAP2)` , not
registers or instructions .
On a heterogeneous system (big.LITTLE) , it is dangerous to detect CPU
features using identification registers . And while it is possible to use
architectural feature registers from userspace on recent kernels, this
won't necessarily work with older platforms . Thus we use the HW_CAPs
exported from the kernel (and visible in getauxval) as the solution.
- According to kernel suggestion , getauxval should be used for this purpose .
- [CPU Feature detection](https://github.com/torvalds/linux/blob/master/Documentation/arm64/cpu-feature-registers.rst)
- According to AAPCS result/paramter registers should be saved/restore for function call
- [AAPCS](http://infocenter.arm.com/help/topic/com.arm.doc.ihi0055b/IHI0055B_aapcs64.pdf)
- [GLibc](https://sourceware.org/git/gitweb.cgi?p=glibc.git;a=blob;f=sysdeps/aarch64/dl-trampoline.S)
Signed-off-by: Jerry Yu <jerry.h.yu@arm.com>
Change-Id: Ic9abe0d2268ac95537e1abf10acc642fc58a5054
