16accb6b24
- 264 license table entries with exact download URLs (224/264 resolved) - Complete sources/ directory with all BitBake recipes - Build configuration: tqma6ul-multi-mba6ulx, spaetzle (musl) - Full traceability for Softwarefreigabeantrag - GCC 13.4.0, Linux 6.6.102, U-Boot 2023.04, musl 1.2.4 - License distribution: GPL-2.0 (24), MIT (23), GPL-2.0+ (18), BSD-3 (16)
41 lines
1.6 KiB
Diff
41 lines
1.6 KiB
Diff
From 9e274ba2762724f353227b5a3a6e4433f706468a Mon Sep 17 00:00:00 2001
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From: Khem Raj <raj.khem@gmail.com>
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Date: Thu, 21 Mar 2024 14:16:08 +0800
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Subject: [PATCH] Implement timer for arm >= v6
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Upstream-Status: Pending
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Signed-off-by: Khem Raj <raj.khem@gmail.com>
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---
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.../range/range_tree/lib/portability/toku_time.h | 14 ++++++++++++++
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1 file changed, 14 insertions(+)
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diff --git a/utilities/transactions/lock/range/range_tree/lib/portability/toku_time.h b/utilities/transactions/lock/range/range_tree/lib/portability/toku_time.h
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index ad7d9f2124..bcb795b7e7 100644
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--- a/utilities/transactions/lock/range/range_tree/lib/portability/toku_time.h
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+++ b/utilities/transactions/lock/range/range_tree/lib/portability/toku_time.h
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@@ -168,6 +168,20 @@ static inline tokutime_t toku_time_now(void) {
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struct timeval tv;
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gettimeofday(&tv, nullptr);
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return (uint64_t)tv.tv_sec * 1000000 + tv.tv_usec;
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+#elif (__ARM_ARCH >= 6)
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+ uint32_t pmccntr;
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+ uint32_t pmuseren;
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+ uint32_t pmcntenset;
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+ // Read the user mode perf monitor counter access permissions.
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+ asm volatile("mrc p15, 0, %0, c9, c14, 0" : "=r"(pmuseren));
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+ if (pmuseren & 1) { // Allows reading perfmon counters for user mode code.
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+ asm volatile("mrc p15, 0, %0, c9, c12, 1" : "=r"(pmcntenset));
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+ if (pmcntenset & 0x80000000ul) { // Is it counting?
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+ asm volatile("mrc p15, 0, %0, c9, c13, 0" : "=r"(pmccntr));
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+ // The counter is set up to count every 64th cycle
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+ return (uint64_t)pmccntr * 64; // Should optimize to << 6
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+ }
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+ }
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#else
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#error No timer implementation for this platform
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#endif
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--
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2.25.1
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