On Mon, Jan 20, 2014 at 01:16:02PM +0100, Paolo Bonzini wrote: > Il 20/01/2014 13:08, Michael S. Tsirkin ha scritto: > >>> > > > >>> > > I think the hack looking for the SMC device is safer than _OSI: OSPMs > >>> > > are known to do crazy things when they see _OSI, such as assuming they > >>> > > need to try and emulate the OS probed. > >> > > >> > Source? > >> > > >> > Paolo > > For example, this one > > http://article.gmane.org/gmane.comp.bios.coreboot.seabios/7235 > > No, not source code. > > Source for "OSPMs do crazy things when they see _OSI". > > Paolo
Ah, that one. For example, this msdn article at microsoft.com: http://msdn.microsoft.com/en-us/library/windows/hardware/gg463275.aspx "How to Identify the Windows Version in ACPI by Using _OSI" at the end it states: the operating system makes features available based on the string argument to the _OSI method. The ACPI spec states this in a more verbose form: 5.7.2 _OSI (Operating System Interfaces) OSPM can choose to expose new functionality based on the _OSI argument string. That is, OSPM can use the strings passed into _OSI to ensure compatibility between older platforms and newer operating systems by maintaining known compatible behavior for a platform. The concern therefore is that if bios only queries OSI for Darwin and not other OSes, some OSPM will assume it's a macbook hardware and do something stupid. -- MST
