cvs commit: src/sys/dev/acpica acpi_pcib_acpi.c
M. Warner Losh
imp at bsdimp.com
Fri Sep 16 11:20:50 PDT 2005
In message: <432AFC3A.8000400 at root.org>
Nate Lawson <nate at root.org> writes:
: M. Warner Losh wrote:
: > In message: <200509160702.j8G72TBv063544 at repoman.freebsd.org>
: > Warner Losh <imp at FreeBSD.org> writes:
: > : imp 2005-09-16 07:02:29 UTC
: > :
: > : FreeBSD src repository
: > :
: > : Modified files:
: > : sys/dev/acpica acpi_pcib_acpi.c
: > : sys/i386/pci pci_bus.c
: > : Log:
: > : Commit a workaround to a problem with resource allocation. This helps
: > : with some Dell servers that booted w/o a problem[*] on 5.4, but failed
: > : with 6.0-BETA.
: > :
: > : On the PCI bus, when we do lazy resource allocation, we narrow the
: > : range requested as we pass through bridges to reflect how the bridges
: > : are programmed and what addresses they pass. However, when we're
: > : doing an allocation on a bus that's directly connected to a host
: > : bridge, no such translation can take place. We already had a fallback
: > : range for memory requests, but none for ioports. As such, provide a
: > : fallback for I/O ports so we don't allocate location 0, which will
: > : have undesired side effects when the resources are actually used.
: > :
: > : This fixes a problem with booting a Dell server with usb in the
: > : kernel. However, it is an unsatisfying solution. I don't like the
: > : hard coded value, and I think we should start narrowing the resources
: > : returned to not be in the so-called isa alias area (where the ranage &
: > : 0x0300 must be 0 iirc). Doing such filtering will have to wait for
: > : another day.
: > :
: > : This may be a good 6 candidate, maybe after its had a chance to be
: > : refined.
: > :
: > : Tested by: glebius@
: > for those interested in the omitted footnote:
: > [*] and also without its first usb controller: uhci0 failed to attach.
: > I don't think this is worthy of a forced commit, but I know how some
: > people are when they see dangling references...
: At some point, I may implement a similar workaround as Windows XP. It
: blocks access by AML to the following port ranges.
: Address Function Comments
: 0x000 0x00F DMA Controller 1
: 0x020 0x021 PIC Access is never allowed*
: 0x040 0x043 System Timer 1
: 0x048 0x04B Timer 2 Failsafe
: 0x070 0x071 System CMOS, RTC
: 0x074 0x076 Extended CMOS
: 0x081 0x083 DMA1 Page Registers
: 0x087 DMA1 CH0 Low Page
: 0x089 DMA2 CH2 Low Page
: 0x08A 0x08B DMA2 CH3 Low Page,
: 0x08F DMA2 Low Page Refresh
: 0x090 0x091 Arbitration Control Port Card Select Feedback
: 0x093 0x094 Reserved System Board Setup
: 0x096 0x097 POS Channel Select
: 0x0A0 0x0A1 Cascaded PIC Access is never allowed*
: 0x0C0 0x0DF ISA DMA
: 0x4D0 0x4D1 PIC Edge/Level CR Access is never allowed*
: 0xCF8 0xD00 PCI Configuration Space
: *Read or write accesses to these ports are always blocked, regardless of
: the BIOS use of the _OSI method.
: Of course, you're describing device resources, but it seems like a
: similar issue. If someone else wants to do this, let me know.
I've been thinking for a long time of having silent devices that
gobble up these resources until such time that we have real devices.
Most of it could be driven by PnP or ACPI info, I believe. The only
one that couldn't be is the PCI Config space, but one change to pci.c
would fix that :-).
More information about the cvs-src