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acpi_cpu: prefer _OSC over _PDC, just in case

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_PDC was deprecated in favor of _OSC long time ago, but it
seems that they still peacefully coexist and in some case
only _PDC is present.
Still _OSC provides a reacher interface and is capable to
report back its status.
If the status is non-zero, then report it, we may find
it useful to understand what firmware expects from OS.
Also clean up some comments that became less useful over time.

Reviewed by:	njl, jhb, rpaulo
MFC after:	3 weeks
This commit is contained in:
Andriy Gapon 2010-02-06 12:48:06 +00:00
parent 341631ae1a
commit f4ab0cccce
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=203546
1 changed files with 18 additions and 20 deletions
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38
sys/dev/acpica/acpi_cpu.c
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@ -345,28 +345,11 @@ acpi_cpu_attach(device_t dev)
}
/*
* CPU capabilities are specified as a buffer of 32-bit integers:
* revision, count, and one or more capabilities. The revision of
* "1" is not specified anywhere but seems to match Linux.
* CPU capabilities are specified in
* Intel Processor Vendor-Specific ACPI Interface Specification.
*/
if (sc->cpu_features) {
arglist.Pointer = arg;
arglist.Count = 1;
arg[0].Type = ACPI_TYPE_BUFFER;
arg[0].Buffer.Length = sizeof(cap_set);
arg[0].Buffer.Pointer = (uint8_t *)cap_set;
cap_set[0] = 1; /* revision */
cap_set[1] = 1; /* number of capabilities integers */
cap_set[2] = sc->cpu_features;
AcpiEvaluateObject(sc->cpu_handle, "_PDC", &arglist, NULL);
/*
* On some systems we need to evaluate _OSC so that the ASL
* loads the _PSS and/or _PDC methods at runtime.
*
* TODO: evaluate failure of _OSC.
*/
arglist.Pointer = arg;
arglist.Count = 4;
arg[0].Type = ACPI_TYPE_BUFFER;
arg[0].Buffer.Length = sizeof(cpu_oscuuid);
@ -380,7 +363,22 @@ acpi_cpu_attach(device_t dev)
arg[3].Buffer.Pointer = (uint8_t *)cap_set;
cap_set[0] = 0; /* status */
cap_set[1] = sc->cpu_features;
AcpiEvaluateObject(sc->cpu_handle, "_OSC", &arglist, NULL);
status = AcpiEvaluateObject(sc->cpu_handle, "_OSC", &arglist, NULL);
if (ACPI_SUCCESS(status)) {
if (cap_set[0] != 0)
device_printf(dev, "_OSC returned status %#x\n", cap_set[0]);
}
else {
arglist.Pointer = arg;
arglist.Count = 1;
arg[0].Type = ACPI_TYPE_BUFFER;
arg[0].Buffer.Length = sizeof(cap_set);
arg[0].Buffer.Pointer = (uint8_t *)cap_set;
cap_set[0] = 1; /* revision */
cap_set[1] = 1; /* number of capabilities integers */
cap_set[2] = sc->cpu_features;
AcpiEvaluateObject(sc->cpu_handle, "_PDC", &arglist, NULL);
}
}
/* Probe for Cx state support. */