Changeset 40075 in vbox for trunk/src/VBox/VMM

Timestamp:

Feb 11, 2012 2:47:21 AM (13 years ago)

Author:

vboxsync

svn:sync-xref-src-repo-rev:

76209

Message:

CPUM.cpp: MXCSR_MASK always was 0xffff not 0 (0xffbf) because of REM.

File:

• trunk/src/VBox/VMM/VMMR3/CPUM.cpp (modified) (1 diff)

trunk/src/VBox/VMM/VMMR3/CPUM.cpp

@@ -1114 +1114 @@
     pCtx->fpu.FCW                   = 0x37f;
 
-    /* Intel 64 and IA-32 Architectures Software Developer's Manual Volume 3A, Table 8-1. IA-32 Processor States Following Power-up, Reset, or INIT */
+    /* Intel 64 and IA-32 Architectures Software Developer's Manual Volume 3A, Table 8-1.
+       IA-32 Processor States Following Power-up, Reset, or INIT */
     pCtx->fpu.MXCSR                 = 0x1F80;
+    pCtx->fpu.MXCSR_MASK            = 0xffff; /** @todo REM always changed this for us. Should probably check if the HW really
+                                                        supports all bits, since a zero value here should be read as 0xffbf. */
 
     /* Init PAT MSR */