kernel_5.10 no rt

hc

2023-12-11 6778948f9de86c3cfaf36725a7c87dcff9ba247f

 kernel/arch/openrisc/kernel/head.S
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@@ -1,3 +1,4 @@
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+/* SPDX-License-Identifier: GPL-2.0-or-later */
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 /*
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  * OpenRISC head.S
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  *
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@@ -8,11 +9,6 @@
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  * Modifications for the OpenRISC architecture:
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  * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
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  * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
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- *
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- *      This program is free software; you can redistribute it and/or
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- *      modify it under the terms of the GNU General Public License
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- *      as published by the Free Software Foundation; either version
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- *      2 of the License, or (at your option) any later version.
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  */
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 #include <linux/linkage.h>
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 #include <linux/errno.h>
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 #include <linux/init.h>
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 #include <linux/serial_reg.h>
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+#include <linux/pgtable.h>
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 #include <asm/processor.h>
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 #include <asm/page.h>
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 #include <asm/mmu.h>
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-#include <asm/pgtable.h>
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 #include <asm/thread_info.h>
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 #include <asm/cache.h>
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 #include <asm/spr_defs.h>
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@@ -525,6 +521,15 @@
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 	l.ori	r3,r0,0x1
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 	l.mtspr	r0,r3,SPR_SR
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+	/*
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+	 * Start the TTCR as early as possible, so that the RNG can make use of
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+	 * measurements of boot time from the earliest opportunity. Especially
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+	 * important is that the TTCR does not return zero by the time we reach
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+	 * rand_initialize().
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+	 */
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+	l.movhi r3,hi(SPR_TTMR_CR)
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+	l.mtspr r0,r3,SPR_TTMR
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+
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 	CLEAR_GPR(r1)
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 	CLEAR_GPR(r2)
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 	CLEAR_GPR(r3)