On Thu, Nov 21, 2013 at 05:02:07PM -0500, Gabriel L. Somlo wrote: > Added qemu-devel, since that is where this stuff belongs now. Everyone > else, sorry for the dupe... > > On Thu, Nov 21, 2013 at 07:14:27PM +0100, Paolo Bonzini wrote: > > Can you remind us about your DSDT modifications? It should be possible > > to patch the HPET and applesmc bits appropriately from QEMU (or to move > > them from the DSDT to an SSDT that is built entirely in QEMU). > > > > It actually isn't impossible that Mac OS X would boot just fine with 1.8... > > My current DSDT patch (against QEMU) is enclosed below. The HPET > basically needs "IRQNoFlags() {2, 8}", which causes XP to bluescreen. > > So, I've made it conditional on the SMC STA method returning success > (0x0B). > > The SMC node's STA method returns 0x0B unconditionally on real > hardware. So I was planning on figuring out what's easier in the > context of the most recent QEMU code base: > > 1. dynamically generating (during qemu runtime initialization) > a DSDT entry for SMC with hardcoded 0x0B STA method, whenever > "--device isa-applesmc" is present on the qemu command line > > or > > 2. writing a static (compile-time) SMC node but with a slightly > smarter _STA method, which returns 0x0B when "--device isa-applesmc" > was given on the cmdline, or which returns 0x00 in the absence > of "--device isa-applesmc". > > Either 1. or 2. could be used with HPET -- I can make inclusion of > IRQNoFlags dependent on either the success or on the presence of > SMC._STA() :) > > Let me know what you think. > > Thanks, > --Gabriel
Without discussing whether this is the right thing to do, main options to implement this would be: - write code in ASL, supply entry in ACPI always, patch some fields to enable/disable it dynamically see how pvpanic entry is disabled for an example - write code in ASL append it to ACPI if necessary see how CPU entries are added depending on number of CPUs for an example - generate code in AML directly see acpi based pci hotplug on pci branch in my tree for an example