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/* SPDX-License-Identifier: GPL-2.0-only */
/****************************************************************
* CPU hotplug
****************************************************************/
Scope(\_SB) {
/* Objects filled in by run-time generated SSDT */
External(NTFY, MethodObj)
External(CPON, PkgObj)
/* 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
Local0 = DerefOf (CPON [Arg0])
// Local1 = Buffer (in madt APIC form) to return
Local1 = Buffer(8) {0x00, 0x08, 0x00, 0x00, 0x00, 0, 0, 0}
// Update the processor id, Local APIC id, and enable/disable status
Local1 [2] = Arg0
Local1 [3] = Arg0
Local1 [4] = Local0
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
Local0 = DerefOf (CPON [Arg0])
If (Local0) {
Return (0xF)
} Else {
Return (0x0)
}
}
Method(CPEJ, 2, NotSerialized) {
// _EJ0 method - eject callback
Sleep(200)
}
/* CPU hotplug notify method */
OperationRegion(PRST, SystemIO, 0xaf00, 32)
Field(PRST, ByteAcc, NoLock, Preserve) {
PRS, 256
}
Method(PRSC, 0) {
// Local5 = active CPU bitmap
Local5 = PRS
// Local2 = last read byte from bitmap
Local2 = 0
// Local0 = Processor ID / APIC ID iterator
Local0 = 0
While (Local0 < SizeOf(CPON)) {
// Local1 = CPON flag for this cpu
Local1 = DerefOf (CPON [Local0])
If (Local0 & 0x07) {
// Shift down previously read bitmap byte
Local2 >>= 1
} Else {
// Read next byte from CPU bitmap
Local2 = DerefOf (Local5 [Local0 >> 3])
}
// Local3 = active state for this cpu
Local3 = Local2 & 1
If (Local1 != Local3) {
// State change - update CPON with new state
CPON [Local0] = Local3
// Do CPU notify
If (Local3 == 1) {
NTFY(Local0, 1)
} Else {
NTFY(Local0, 3)
}
}
Local0++
}
}
}
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