Source code of Windows XP (NT5)
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134 lines
2.7 KiB

/*
* TRITON.C - Intel Triton PCI chipset routines.
*
* Notes:
* Algorithms from Intel Triton 82430FX PCISET Data Sheet
* (Intel Secret) 82371FB PCI ISA IDE Xcelerator spec.
*
*/
#include "local.h"
/****************************************************************************
*
* TritonSetIRQ - Set a Triton PCI link to a specific IRQ
*
* Exported.
*
* ENTRY: bIRQNumber is the new IRQ to be used.
*
* bLink is the Link to be set.
*
* EXIT: Standard PCIMP return value.
*
***************************************************************************/
PCIMPRET CDECL
TritonSetIRQ(UCHAR bIRQNumber, UCHAR bLink)
{
//
// Validate link number.
//
if (bLink < 0x40) {
return(PCIMP_INVALID_LINK);
}
//
// Use 0x80 to disable.
//
if (!bIRQNumber)
bIRQNumber=0x80;
//
// Set the Triton IRQ register.
//
WriteConfigUchar(bBusPIC, bDevFuncPIC, bLink, bIRQNumber);
return(PCIMP_SUCCESS);
}
/****************************************************************************
*
* TritonGetIRQ - Get the IRQ of a Triton PCI link
*
* Exported.
*
* ENTRY: pbIRQNumber is the buffer to fill.
*
* bLink is the Link to be read.
*
* EXIT: Standard PCIMP return value.
*
***************************************************************************/
PCIMPRET CDECL
TritonGetIRQ(PUCHAR pbIRQNumber, UCHAR bLink)
{
//
// Validate link number.
//
if (bLink < 0x40) {
return(PCIMP_INVALID_LINK);
}
//
// Store the IRQ value.
//
*pbIRQNumber=ReadConfigUchar(bBusPIC, bDevFuncPIC, bLink);
//
// Return 0 if disabled.
//
if (*pbIRQNumber & 0x80)
*pbIRQNumber=0;
return(PCIMP_SUCCESS);
}
/****************************************************************************
*
* TritonValidateTable - Validate an IRQ table
*
* Exported.
*
* ENTRY: piihIRQInfoHeader points to an IRQInfoHeader followed
* by an IRQ Routing Table.
*
* ulFlags are PCIMP_VALIDATE flags.
*
* EXIT: Standard PCIMP return value.
*
***************************************************************************/
PCIMPRET CDECL
TritonValidateTable(PIRQINFOHEADER piihIRQInfoHeader, ULONG ulFlags)
{
if ((ulFlags & PCIMP_VALIDATE_SOURCE_BITS)==PCIMP_VALIDATE_SOURCE_PCIBIOS) {
//
// If all links are above 40, we they are config space.
//
if (GetMinLink(piihIRQInfoHeader)>=0x40)
return(PCIMP_SUCCESS);
//
// If there are links above 4, we are clueless.
//
if (GetMaxLink(piihIRQInfoHeader)>0x04)
return(PCIMP_FAILURE);
//
// Assume 1,2,3,4 are the 60,61,62,63 links.
//
NormalizeLinks(piihIRQInfoHeader, 0x5F);
} else {
//
// Validate that all config space addresses are above 40.
//
if (GetMinLink(piihIRQInfoHeader)<0x40)
return(PCIMP_FAILURE);
}
return(PCIMP_SUCCESS);
}