Author: mhorne Date: Tue Sep 8 15:39:19 2020 New Revision: 365461 URL: https://svnweb.freebsd.org/changeset/base/365461
Log: arm64: check for CRC32 support via HWCAP 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 Modified: head/sys/libkern/gsb_crc32.c Modified: head/sys/libkern/gsb_crc32.c ============================================================================== --- head/sys/libkern/gsb_crc32.c Tue Sep 8 15:36:38 2020 (r365460) +++ head/sys/libkern/gsb_crc32.c Tue Sep 8 15:39:19 2020 (r365461) @@ -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 _______________________________________________ svn-src-head@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
