Date: Tue, 21 Jul 2015 12:50:46 +0000 (UTC) From: Zbigniew Bodek <zbb@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r285745 - head/sys/arm64/include Message-ID: <201507211250.t6LCokFf051783@repo.freebsd.org>
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Author: zbb Date: Tue Jul 21 12:50:45 2015 New Revision: 285745 URL: https://svnweb.freebsd.org/changeset/base/285745 Log: Implement get_cyclecount() on ARM64 Use Vritual Counter register associated with Generic Timer to read the cyclecount. Obtained from: Semihalf Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D3134 Modified: head/sys/arm64/include/cpu.h Modified: head/sys/arm64/include/cpu.h ============================================================================== --- head/sys/arm64/include/cpu.h Tue Jul 21 12:47:15 2015 (r285744) +++ head/sys/arm64/include/cpu.h Tue Jul 21 12:50:45 2015 (r285745) @@ -43,6 +43,7 @@ #include <machine/atomic.h> #include <machine/frame.h> +#include <machine/armreg.h> #define TRAPF_PC(tfp) ((tfp)->tf_lr) #define TRAPF_USERMODE(tfp) (((tfp)->tf_elr & (1ul << 63)) == 0) @@ -120,9 +121,11 @@ void swi_vm(void *v); static __inline uint64_t get_cyclecount(void) { + uint64_t ret; - /* TODO: This is bogus */ - return (1); + ret = READ_SPECIALREG(cntvct_el0); + + return (ret); } #define ADDRESS_TRANSLATE_FUNC(stage) \
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