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diff --git a/src/hw/i386/acpi-dsdt-cpu-hotplug.dsl b/src/hw/i386/acpi-dsdt-cpu-hotplug.dsl
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+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+/****************************************************************
+ * CPU hotplug
+ ****************************************************************/
+
+Scope(\_SB) {
+ /* Objects filled in by run-time generated SSDT */
+ External(NTFY, MethodObj)
+ External(CPON, PkgObj)
+ External(PRS, FieldUnitObj)
+
+ /* Methods called by run-time generated SSDT Processor objects */
+ Method(CPMA, 1, NotSerialized) {
+ // _MAT method - create an madt apic buffer
+ // Arg0 = Processor ID = Local APIC ID
+ // Local0 = CPON flag for this cpu
+ Store(DerefOf(Index(CPON, Arg0)), Local0)
+ // Local1 = Buffer (in madt apic form) to return
+ Store(Buffer(8) {0x00, 0x08, 0x00, 0x00, 0x00, 0, 0, 0}, Local1)
+ // Update the processor id, lapic id, and enable/disable status
+ Store(Arg0, Index(Local1, 2))
+ Store(Arg0, Index(Local1, 3))
+ Store(Local0, Index(Local1, 4))
+ Return (Local1)
+ }
+ Method(CPST, 1, NotSerialized) {
+ // _STA method - return ON status of cpu
+ // Arg0 = Processor ID = Local APIC ID
+ // Local0 = CPON flag for this cpu
+ Store(DerefOf(Index(CPON, Arg0)), Local0)
+ If (Local0) {
+ Return (0xF)
+ } Else {
+ Return (0x0)
+ }
+ }
+ Method(CPEJ, 2, NotSerialized) {
+ // _EJ0 method - eject callback
+ Sleep(200)
+ }
+
+#define CPU_STATUS_LEN ACPI_GPE_PROC_LEN
+ Method(PRSC, 0) {
+ // Local5 = active cpu bitmap
+ Store(PRS, Local5)
+ // Local2 = last read byte from bitmap
+ Store(Zero, Local2)
+ // Local0 = Processor ID / APIC ID iterator
+ Store(Zero, Local0)
+ While (LLess(Local0, SizeOf(CPON))) {
+ // Local1 = CPON flag for this cpu
+ Store(DerefOf(Index(CPON, Local0)), Local1)
+ If (And(Local0, 0x07)) {
+ // Shift down previously read bitmap byte
+ ShiftRight(Local2, 1, Local2)
+ } Else {
+ // Read next byte from cpu bitmap
+ Store(DerefOf(Index(Local5, ShiftRight(Local0, 3))), Local2)
+ }
+ // Local3 = active state for this cpu
+ Store(And(Local2, 1), Local3)
+
+ If (LNotEqual(Local1, Local3)) {
+ // State change - update CPON with new state
+ Store(Local3, Index(CPON, Local0))
+ // Do CPU notify
+ If (LEqual(Local3, 1)) {
+ NTFY(Local0, 1)
+ } Else {
+ NTFY(Local0, 3)
+ }
+ }
+ Increment(Local0)
+ }
+ }
+}
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