shithub: riscv

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ref: 3da0a627971a5ec4ca5c8253dbb798df56c5ddcb
parent: 217222e75a112845a0345875b0404afa1c6a58b0
author: cinap_lenrek <cinap_lenrek@felloff.net>
date: Sat Jul 8 14:19:20 EDT 2023

devvmx: restore previous initial value for xcr0

as the processor manual states, xcr0 should be 1 on reset
(if extended states are supported).

--- a/sys/src/9/pc/devvmx.c

+++ b/sys/src/9/pc/devvmx.c

@@ -1063,7 +1063,7 @@

 #endif

 	fpinit();

 	fpsave(&vmx->fp);

-	vmx->xcr0 = m->xcr0;

+	vmx->xcr0 = m->xcr0 & 1;	/* x87 only */

 	splx(s);

 	memset(vmx->msrbits, -1, 4096);