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arm64: check for CRC32 support via HWCAP

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Doing it this way eliminates the assumption about homogeneous support
for the feature, since HWCAP values are only set if support is present
on all CPUs.

Reviewed by:	tuexen, markj
MFC after:	1 week
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D26032
This commit is contained in:
Mitchell Horne 2020-09-08 15:39:19 +00:00
parent 752eb6a995
commit 66245bc536
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=365461
1 changed files with 3 additions and 9 deletions
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12
sys/libkern/gsb_crc32.c
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@ -58,7 +58,8 @@ __FBSDID("$FreeBSD$");
#endif
#if defined(__aarch64__)
#include <machine/cpu.h>
#include <machine/elf.h>
#include <machine/md_var.h>
#endif
#endif /* _KERNEL */
@ -755,14 +756,7 @@ calculate_crc32c(uint32_t crc32c,
} else
#endif
#if defined(__aarch64__)
uint64_t reg;
/*
* We only test for CRC32 support on the CPU with index 0 assuming that
* this applies to all CPUs.
*/
reg = READ_SPECIALREG(id_aa64isar0_el1);
if (ID_AA64ISAR0_CRC32_VAL(reg) != ID_AA64ISAR0_CRC32_NONE) {
if ((elf_hwcap & HWCAP_CRC32) != 0) {
return (armv8_crc32c(crc32c, buffer, length));
} else
#endif