Author: jhb
Date: Sat Apr 28 00:16:54 2018
New Revision: 333080
URL: https://svnweb.freebsd.org/changeset/base/333080
Log:
MFC 332733:
Workaround fixed I/O port resources encoded as I/O port ranges in _CRS.
ACPI I/O port descriptors use _MIN and _MAX fields to specify the set
of allowable base (start) addresses for an I/O port resource along with
a _LEN field specifying the length. A fixed resource is supposed to be
encoded with _MIN == _MAX, but some buggy firmwares instead set _MAX to
the end of the fixed range. Relocating I/O ranges only make sense in
_PRS (possible resource settings), not in _CRS (current resource settings),
so if an I/O port range with _MAX set set to the end of the range is
present in _CRS, treat it as a fixed I/O port resource starting at
_MIN.
PR: 224096
Modified:
stable/10/sys/dev/acpica/acpi_resource.c
Directory Properties:
stable/10/ (props changed)
Changes in other areas also in this revision:
Modified:
stable/11/sys/dev/acpica/acpi_resource.c
Directory Properties:
stable/11/ (props changed)
Modified: stable/10/sys/dev/acpica/acpi_resource.c
==============================================================================
--- stable/10/sys/dev/acpica/acpi_resource.c Fri Apr 27 22:15:18 2018
(r333079)
+++ stable/10/sys/dev/acpica/acpi_resource.c Sat Apr 28 00:16:54 2018
(r333080)
@@ -515,6 +515,24 @@ acpi_res_set_iorange(device_t dev, void *context, uint
if (cp == NULL)
return;
+
+ /*
+ * XXX: Some BIOSes contain buggy _CRS entries where fixed I/O
+ * ranges have the maximum base address (_MAX) to the end of the
+ * I/O range instead of the start. These are then treated as a
+ * relocatable I/O range rather than a fixed I/O resource. As a
+ * workaround, treat I/O resources encoded this way as fixed I/O
+ * ports.
+ */
+ if (high == (low + length)) {
+ if (bootverbose)
+ device_printf(dev,
+ "_CRS has fixed I/O port range defined as relocatable\n");
+
+ bus_set_resource(dev, SYS_RES_IOPORT, cp->ar_nio++, low, length);
+ return;
+ }
+
device_printf(dev, "I/O range not supported\n");
}
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