Ensure we clear bits we don't want set in cr0 on APs

2015-03-03 16:12:37 -08:00 · 2015-03-03 16:12:37 -08:00 · 1fdc2fd933
commit 1fdc2fd933
parent 33af1ed42b
1 changed files with 2 additions and 0 deletions
--- a/sys/amd64/mpboot.S
+++ b/sys/amd64/mpboot.S
@ -78,6 +78,8 @@ mpstart_enter32:

    // Set CR0
    movl    %cr0, %eax
+    // QEMU seems to set cr0 with garbage
+    andl    $0x1FF5FFC0, %eax
    orl     $0x8005002B, %eax
    movl    %eax, %cr0