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List:       openbsd-tech
Subject:    arm: allow Cortex-A53/A57/A72 on armv7
From:       Patrick Wildt <patrick () blueri ! se>
Date:       2016-03-02 13:47:53
Message-ID: 20160302134753.GA71321 () eris ! local
[Download RAW message or body]

Hi,

apparently AArch32 of ARMv8 is backwards compatible to ARMv7,
so we can basically run OpenBSD/armv7 on those new fancy chips.

Early on set_cpufuncs() is called and makes the kernel panic if
it can't find a setup routine for the processor it is running
on.  This diff allows set_cpufuncs() to succeed on the newer
Cortex-A53, A57 and A72.

This way, and including some other (still) local diffs, I have
the brand new raspberry Pi 3 in multiuser: http://ix.io/oJV

Patrick

diff --git sys/arch/arm/arm/cpufunc.c sys/arch/arm/arm/cpufunc.c
index 4fcc88a..8c8e0cf 100644
--- sys/arch/arm/arm/cpufunc.c
+++ sys/arch/arm/arm/cpufunc.c
@@ -1003,7 +1003,10 @@ set_cpufuncs()
 	    (cputype & CPU_ID_CORTEX_A8_MASK) == CPU_ID_CORTEX_A8 ||
 	    (cputype & CPU_ID_CORTEX_A9_MASK) == CPU_ID_CORTEX_A9 ||
 	    (cputype & CPU_ID_CORTEX_A15_MASK) == CPU_ID_CORTEX_A15 ||
-	    (cputype & CPU_ID_CORTEX_A17_MASK) == CPU_ID_CORTEX_A17) {
+	    (cputype & CPU_ID_CORTEX_A17_MASK) == CPU_ID_CORTEX_A17 ||
+	    (cputype & CPU_ID_CORTEX_A53_MASK) == CPU_ID_CORTEX_A53 ||
+	    (cputype & CPU_ID_CORTEX_A57_MASK) == CPU_ID_CORTEX_A57 ||
+	    (cputype & CPU_ID_CORTEX_A72_MASK) == CPU_ID_CORTEX_A72) {
 		cpufuncs = armv7_cpufuncs;
 		cpu_reset_needs_v4_MMU_disable = 1;	/* V4 or higher */
 		arm_get_cachetype_cp15v7();

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