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Evaluate _OSC on boot to indicate our OS capabilities to ACPI. This is

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needed at least to convince the BIOS to give us access to CPU freq
control on MacBooks.

Submitted by:	Rui Paulo <rpaulo / fnop.net>
Approved by:	re
MFC after:	5 days
This commit is contained in:
njl 2007-08-30 21:18:42 +00:00
parent 5a077cac2f
commit addf8f8db2
1 changed files with 32 additions and 7 deletions
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39
sys/dev/acpica/acpi_cpu.c
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@ -257,7 +257,7 @@ static int
acpi_cpu_attach(device_t dev)
{
ACPI_BUFFER buf;
ACPI_OBJECT arg, *obj;
ACPI_OBJECT arg[4], *obj;
ACPI_OBJECT_LIST arglist;
struct pcpu *pcpu_data;
struct acpi_cpu_softc *sc;
@ -268,6 +268,11 @@ acpi_cpu_attach(device_t dev)
driver_t **drivers;
uint32_t cap_set[3];
/* UUID needed by _OSC evaluation */
static uint8_t cpu_oscuuid[16] = { 0x16, 0xA6, 0x77, 0x40, 0x0C, 0x29,
0xBE, 0x47, 0x9E, 0xBD, 0xD8, 0x70,
0x58, 0x71, 0x39, 0x53 };
ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
sc = device_get_softc(dev);
@ -334,19 +339,39 @@ 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. We should
* also support _OSC here.
* "1" is not specified anywhere but seems to match Linux.
*/
if (sc->cpu_features) {
arglist.Pointer = &arg;
arglist.Pointer = arg;
arglist.Count = 1;
arg.Type = ACPI_TYPE_BUFFER;
arg.Buffer.Length = sizeof(cap_set);
arg.Buffer.Pointer = (uint8_t *)cap_set;
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);
arg[0].Buffer.Pointer = cpu_oscuuid; /* UUID */
arg[1].Type = ACPI_TYPE_INTEGER;
arg[1].Integer.Value = 1; /* revision */
arg[2].Type = ACPI_TYPE_INTEGER;
arg[2].Integer.Value = 1; /* count */
arg[3].Type = ACPI_TYPE_BUFFER;
arg[3].Buffer.Length = sizeof(cap_set); /* Capabilities buffer */
arg[3].Buffer.Pointer = (uint8_t *)cap_set;
cap_set[0] = 0;
AcpiEvaluateObject(sc->cpu_handle, "_OSC", &arglist, NULL);
}
/* Probe for Cx state support. */