Il 21/11/2013 23:02, Gabriel L. Somlo ha scritto:
> 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.
The IRQNoFlags(){2,8} setting makes sense if the general configuration
register of the HPET has bits 0..1=1 (HPET enabled = 1 and HPET legacy
replacement route = 1).
That would be something like
Field(HPTM, DWordAcc, Lock, Preserve) {
VEND, 32,
PRD, 32,
UNUS, 32
GCNF, 32
}
...
Method(_CRS, 0) {
Store(GCNF, Local0)
If (LEqual(LAnd(Local0, 3), 3)) { // Legacy replacement route
ConcatenateResTemplate(RESP, RESI, Local1)
Return (Local1)
} else {
Return (RESP)
}
}
If that doesn't work, there are various choices here...
(1) Does Mac OS work if you add a _PRS with IRQNoFlags and
Memory32Fixed, but leave _CRS as it is?
(2) does it work with -no-hpet?
(3) you could also make that dependent on _OSI("Darwin"). It's unlikely
that Linux and/or Windows expose _OSI("Darwin"), and anyway the BSOD is
only there for Windows XP as I understand it.
> So, I've made it conditional on the SMC STA method returning success
> (0x0B).
That would mean that running Windows XP on "Mac OS X hardware" breaks,
though.
> 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 would work. See acpi_get_misc_info and patch_ssdt in
hw/i386/acpi-build.c.
I think device-dependent ACPI stuff should become a QOM interface, but
you need not do that.
Paolo
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