Date: Mon, 27 Sep 2021 14:08:40 GMT From: Andrew Turner <andrew@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org Subject: git: 53192f33198a - stable/13 - Read the arm64 midr register earlier Message-ID: <202109271408.18RE8egD082440@gitrepo.freebsd.org>
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The branch stable/13 has been updated by andrew: URL: https://cgit.FreeBSD.org/src/commit/?id=53192f33198ac8c225579934f258db115ae7139a commit 53192f33198ac8c225579934f258db115ae7139a Author: Andrew Turner <andrew@FreeBSD.org> AuthorDate: 2021-08-11 15:01:25 +0000 Commit: Andrew Turner <andrew@FreeBSD.org> CommitDate: 2021-09-27 08:36:38 +0000 Read the arm64 midr register earlier We use the midr_el1 register to decode which CPU type we are booting from. Read it on the secondary CPUs before waiting for the boot CPU to release us as it will need to use it before the release. Sponsored by: The FreeBSD Foundation (cherry picked from commit 6b22840ed0e8f9ceb34465987b8469a43ebb4582) --- sys/arm64/arm64/mp_machdep.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/sys/arm64/arm64/mp_machdep.c b/sys/arm64/arm64/mp_machdep.c index 3b1a8cc89cab..547bd576362e 100644 --- a/sys/arm64/arm64/mp_machdep.c +++ b/sys/arm64/arm64/mp_machdep.c @@ -239,6 +239,7 @@ init_secondary(uint64_t cpu) * We need this before signalling the CPU is ready to * let the boot CPU use the results. */ + pcpup->pc_midr = get_midr(); identify_cpu(cpu); /* Ensure the stores in identify_cpu have completed */ @@ -249,8 +250,6 @@ init_secondary(uint64_t cpu) while (!atomic_load_int(&aps_ready)) __asm __volatile("wfe"); - pcpup->pc_midr = get_midr(); - /* Initialize curthread */ KASSERT(PCPU_GET(idlethread) != NULL, ("no idle thread")); pcpup->pc_curthread = pcpup->pc_idlethread;
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