mirror/freebsd
1
0
Fork 0
mirror of https://git.FreeBSD.org/src.git synced 2024-12-18 10:35:55 +00:00
Code Issues Releases Activity

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

Browse Source 
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:
Nate Lawson 2007-08-30 21:18:42 +00:00
parent 207455510b
commit c961faca8c
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=172022
1 changed files with 32 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

39
sys/dev/acpica/acpi_cpu.c
View File

@ -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. */