diff options
| -rw-r--r-- | src/arch/i386/prefix/romprefix.S | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/src/arch/i386/prefix/romprefix.S b/src/arch/i386/prefix/romprefix.S index ca32a441..3351494b 100644 --- a/src/arch/i386/prefix/romprefix.S +++ b/src/arch/i386/prefix/romprefix.S @@ -205,7 +205,16 @@ init: movb %bl, %al call print_hex_byte cmpb $3, %bh + jb 1f + /* PCI >=3.0: leave %gs as-is if sane */ + movw %gs, %ax + cmpw $0xc000, %ax jae 2f + /* PCI 3.0 with insane %gs value: print error and ignore %gs */ + movb $'!', %al + call print_character + movw %gs, %ax + call print_hex_word 1: /* PCI <3.0: set %gs (runtime segment) = %cs (init-time segment) */ pushw %cs popw %gs |