* [Qemu-devel] About PC_COMPAT
@ 2016-03-22 6:43 =?gb18030?B?2dyVRg==?=
2016-03-22 12:06 ` Dr. David Alan Gilbert
0 siblings, 1 reply; 2+ messages in thread
From: =?gb18030?B?2dyVRg==?= @ 2016-03-22 6:43 UTC (permalink / raw)
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I find PC_COMPAT_X_Y macros in file pc.h, and I don't understand why the smaller is the X_Y the more the devices defined? Can someone explain? Thanks!
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* Re: [Qemu-devel] About PC_COMPAT
2016-03-22 6:43 [Qemu-devel] About PC_COMPAT =?gb18030?B?2dyVRg==?=
@ 2016-03-22 12:06 ` Dr. David Alan Gilbert
0 siblings, 0 replies; 2+ messages in thread
From: Dr. David Alan Gilbert @ 2016-03-22 12:06 UTC (permalink / raw)
To: 佘旻; +Cc: qemu-devel
* 佘旻 (chagg@foxmail.com) wrote:
> I find PC_COMPAT_X_Y macros in file pc.h, and I don't understand why the smaller is the X_Y the more the devices defined? Can someone explain? Thanks!
It's because they're the difference from the current version - so the older
the version the more differences.
So PC_COMPAT_2_5 has no differences, PC_COMPAT_2_4 is 2_5's differences (none)
plus a handful of CPU differences. The PC_COMPAT_2_3 is PC_COMPAT_2_4's differences
plus a bunch of differences that went in between 2.3 and 2.4.
Dave
--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK
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