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OvmfPkg: simplify _CRS, _PRS, _SRS methods in the DSDT 

Use Extended Interrupt Descriptors in the _CRS, _PRS, _SRS methods of
\_SB.PCI0.LPC.LNK[A-D], eliminating bit shifting.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13619 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
jljusten 2012-08-13 15:40:07 +00:00
parent 5e57fb754a
commit cc16a9298b
1 changed files with 23 additions and 23 deletions
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46
OvmfPkg/AcpiTables/Dsdt.asl
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@ -250,46 +250,46 @@ DefinitionBlock ("Dsdt.aml", "DSDT", 1, "INTEL ", "OVMF ", 3) {
// _CRS method for LNKA, LNKB, LNKC, LNKD
//
Method (PCRS, 1, NotSerialized) {
Name (BUF0, ResourceTemplate () {IRQ (Level, ActiveLow, Shared){0}})
//
// Define references to buffer elements
// create temporary buffer with an Extended Interrupt Descriptor
// whose single vector defaults to zero
//
CreateWordField (BUF0, 0x01, IRQW) // IRQ low
//
// Write current settings into IRQ descriptor
//
If (And (Arg0, 0x80)) {
Store (Zero, Local0)
} Else {
Store (One, Local0)
Name (BUF0, ResourceTemplate () {
Interrupt (ResourceConsumer, Level, ActiveLow, Shared){0}
}
)
//
// Shift 1 by value in register 70
// define reference to first interrupt vector in buffer
//
ShiftLeft (Local0, And (Arg0, 0x0F), IRQW) // Save in buffer
Return (BUF0) // Return Buf0
CreateDWordField (BUF0, 0x05, IRQW)
//
// If the disable-bit is clear, overwrite the default zero vector
// with the value in Arg0 (ie. PIRQRC[A:D]). Reserved bits are read
// as 0.
//
If (LNot (And (Arg0, 0x80))) {
Store (Arg0, IRQW)
}
Return (BUF0)
}
//
// _PRS resource for LNKA, LNKB, LNKC, LNKD
//
Name (PPRS, ResourceTemplate () {
IRQ (Level, ActiveLow, Shared) {3, 4, 5, 7, 9, 10, 11, 12, 14, 15}
Interrupt (ResourceConsumer, Level, ActiveLow, Shared) {
3, 4, 5, 7, 9, 10, 11, 12, 14, 15
}
})
//
// _SRS method for LNKA, LNKB, LNKC, LNKD
//
Method (PSRS, 2, NotSerialized) {
CreateWordField (Arg1, 0x01, IRQW) // IRQ low
FindSetRightBit (IRQW, Local0) // Set IRQ
If (LNotEqual (IRQW, Zero)) {
And (Local0, 0x7F, Local0)
Decrement (Local0)
} Else {
Or (Local0, 0x80, Local0)
}
Store (Local0, Arg0)
CreateDWordField (Arg1, 0x05, IRQW)
Store (IRQW, Arg0)
}
//