2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License as published by
4 * the Free Software Foundation; either version 2 of the License, or
5 * (at your option) any later version.
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 * GNU General Public License for more details.
12 * You should have received a copy of the GNU General Public License along
13 * with this program; if not, see <http://www.gnu.org/licenses/>.
16 /****************************************************************
18 ****************************************************************/
19 #define CPU_HOTPLUG_RESOURCE_DEVICE PRES
22 /* Objects filled in by run-time generated SSDT */
23 External(NTFY, MethodObj)
24 External(CPON, PkgObj)
26 /* Methods called by run-time generated SSDT Processor objects */
27 Method(CPMA, 1, NotSerialized) {
28 // _MAT method - create an madt apic buffer
29 // Arg0 = Processor ID = Local APIC ID
30 // Local0 = CPON flag for this cpu
31 Store(DerefOf(Index(CPON, Arg0)), Local0)
32 // Local1 = Buffer (in madt apic form) to return
33 Store(Buffer(8) {0x00, 0x08, 0x00, 0x00, 0x00, 0, 0, 0}, Local1)
34 // Update the processor id, lapic id, and enable/disable status
35 Store(Arg0, Index(Local1, 2))
36 Store(Arg0, Index(Local1, 3))
37 Store(Local0, Index(Local1, 4))
40 Method(CPST, 1, NotSerialized) {
41 // _STA method - return ON status of cpu
42 // Arg0 = Processor ID = Local APIC ID
43 // Local0 = CPON flag for this cpu
44 Store(DerefOf(Index(CPON, Arg0)), Local0)
51 Method(CPEJ, 2, NotSerialized) {
52 // _EJ0 method - eject callback
56 #define CPU_STATUS_LEN ACPI_GPE_PROC_LEN
57 OperationRegion(PRST, SystemIO, CPU_STATUS_BASE, CPU_STATUS_LEN)
58 Field(PRST, ByteAcc, NoLock, Preserve) {
62 // Local5 = active cpu bitmap
64 // Local2 = last read byte from bitmap
66 // Local0 = Processor ID / APIC ID iterator
68 While (LLess(Local0, SizeOf(CPON))) {
69 // Local1 = CPON flag for this cpu
70 Store(DerefOf(Index(CPON, Local0)), Local1)
71 If (And(Local0, 0x07)) {
72 // Shift down previously read bitmap byte
73 ShiftRight(Local2, 1, Local2)
75 // Read next byte from cpu bitmap
76 Store(DerefOf(Index(Local5, ShiftRight(Local0, 3))), Local2)
78 // Local3 = active state for this cpu
79 Store(And(Local2, 1), Local3)
81 If (LNotEqual(Local1, Local3)) {
82 // State change - update CPON with new state
83 Store(Local3, Index(CPON, Local0))
85 If (LEqual(Local3, 1)) {
95 Device(CPU_HOTPLUG_RESOURCE_DEVICE) {
96 Name(_HID, EisaId("PNP0A06"))
97 Name(_UID, "CPU hotplug resources")
99 Name(_CRS, ResourceTemplate() {
100 IO(Decode16, CPU_STATUS_BASE, CPU_STATUS_BASE, 0, CPU_STATUS_LEN)
103 Name(_STA, 0xB) /* present, functioning, decoding, not shown in UI */