src/sys/dev/pci, branch release/8.1.0

MFC r208149,208285:

2010-05-23T02:15:31Z

Add support for the U4 PCI-Express bridge chipset used in late-generation Powermac G5 systems. MSI and several other things are not presently supported. The U3/U4 internal device support portions of this change were contributed by Andreas Tobler.

MFC rev 198431:

2010-03-31T03:14:40Z

Have the early USB takeover only enabled for i386 and amd64 by default. This also avoids a panic on PowerPC.

MFC r203355:

2010-03-18T18:44:08Z

Add more bit definitions to PCI express device control and device status register.

MFC x86emu/x86bios emulator and make previously i386 only dpms and vesa

2010-03-02T01:56:55Z

framebuffer driver, etc. work on FreeBSD/amd64. A significant amount of improvements were done by jkim@ during the recent months to make vesa(4) work better, over the initial code import. This work is based on OpenBSD's x86emu implementation and contributed by paradox and swell.k at gmail com. Hopefully I have stolen all their work to 8-STABLE :) All bugs in this commit are mine, as usual.

MFC r203528:

2010-02-19T18:07:51Z

Add pci_get|set_max_read_req() helper functions to control maximum PCIe read request size.

MFC r199814

2009-12-09T22:41:50Z

Disable interrupts after doing early takeover of the usb controller in case usb isnt actually compiled in (or kldloaded) as the controller could cause spurious interrupts.

MFC 197450: number of cleanups in i386 and amd64 pci md code

2009-11-01T18:39:26Z

MFC r198151

2009-10-29T23:25:52Z

Workaround buggy BIOS code in USB regard. By doing the BIOS to OS handover for all host controllers at the same time, we avoid problems where the BIOS will actually write to the USB registers of all the USB host controllers every time we handover one of them, and consequently reset the OS programmed values.

MFC 197406:

2009-09-25T14:58:00Z

Don't reread the command register to see if enabling I/O or memory decoding "took". Other OS's that I checked do not do this and it breaks some amdpm(4) devices. Prior to 7.2 we did not honor the error returned when this failed anyway, so this in effect restores previous behavior. Approved by: re (kib)

MFC r197099: pci(4): don't perform maximum register number check

2009-09-19T08:13:10Z

Different sub-kinds of PCI buses may have different rules and thus it is up for the bus backends to do proper input checks. For example, PCIe allows configuration register numbers < 0x1000, while for PCI proper the limit is 0x100. And, in fact, the buses already do the checks. Reviewed by: jhb Approved by: re (kib)