151 lines
3.9 KiB
C
151 lines
3.9 KiB
C
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/**
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*** Copyright (C) 1996-97 Intel Corporation. All rights reserved.
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***
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*** The information and source code contained herein is the exclusive
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*** property of Intel Corporation and may not be disclosed, examined
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*** or reproduced in whole or in part without explicit written authorization
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*** from the company.
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**/
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/*++
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Copyright (c) 1991 Microsoft Corporation
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Module Name:
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hwpcia.c
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Abstract:
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Calls the PCI rom function to determine what type of PCI
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support is present, if any.
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Author:
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Allen Kay (akay) 15-Aug-97
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--*/
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BOOLEAN
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HwGetPciSystemData(
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PPCI_SYSTEM_DATA PciSystemData,
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BOOLEAN BiosDateFound
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)
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/*++
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Routine Description:
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This function retrieves the PCI System Data
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Arguments:
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PciSystemData - Supplies a pointer to the structure which will
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receive the PCI System Data.
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Return Value:
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True - PCI System Detected and System Data valid
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False - PCI System Not Detected
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--*/
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{
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IA32_BIOS_REGISTER_STATE IA32RegisterState;
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BIT32_AND_BIT16 IA32Register, Eax, Edx;
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ULONG NoBuses;
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if (BiosDateFound == 1) {
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IA32Register.LowPart16 = PCI_BIOS_PRESENT
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IA32Register.HighPart16 = 0;
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IA32RegisterState.eax = IA32Register.Part32;
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SAL_PROC(0x1a,&IA32RegisterState,0,0,0,0,0,0);
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//
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// First get all the needed registers.
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//
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Eax.Part32 = IA32RegisterState.Eax;
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Ebx.Part32 = IA32RegisterState.Ebx;
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Ecx.Part32 = IA32RegisterState.Ecx;
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Edx.Part32 = IA32RegisterState.Edx;
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if ( ( IA32RegisterState.Eflags & CARRY_FLAG ) == 0) &&
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Eax.Byte1 == 0 &&
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Edx.Byte0 == 'P' &&
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Edx.Byte1 == 'C' &&
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Edx.Byte2 == 'I' ) {
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//
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// Found PCI BIOS Version > 1.0
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//
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// The only thing left to do is squirrel the data away
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//
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PciSystemData->MajorRevision = Ebx.Byte1;
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PciSystemData->MinorRevision = Ebx.Byte0;
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PciSystemData->NoBuses = Ecx.Byte0 + 1; // LastBus + 1
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PciSystemData->HwMechanism = Eax.Byte0;
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} else {
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//
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// Look for BIOS Version 1.0. this has a different function #
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//
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IA32Register.LowPart16 = PCI10_BIOS_PRESENT
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IA32Register.HighPart16 = 0;
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IA32RegisterState.eax = IA32Register.Part32;
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SAL_PROC(0x1a,&IA32RegisterState,0,0,0,0,0,0);
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//
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// Version 1.0 has "PCI " in dx and cx, the Version number in ax,
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// and the carry flag cleared. These are all the indications
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// available.
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//
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//
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// First get all the needed registers.
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//
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Eax.Part32 = IA32RegisterState.Eax;
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Ebx.Part32 = IA32RegisterState.Ebx;
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Ecx.Part32 = IA32RegisterState.Ecx;
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Edx.Part32 = IA32RegisterState.Edx;
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if (Edx.Byte0 == 'P' &&
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Edx.Byte1 == 'C' &&
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Ecx.Byte0 == 'I') {
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//
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// Found PCI BIOS Version 1.0
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//
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// The only thing left to do is squirrel the data away for
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// the caller.
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//
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PciSystemData->MajorRevision = Eax.Byte1;
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PciSystemData->MinorRevision = Eax.Byte0;
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//
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// The Version 1.0 BIOS is only early HW that couldn't
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// support multifunction devices or multiple bus's. So
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// without reading any device data, mark it as such.
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//
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PciSystemData->HwMechanism = 2;
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PciSystemData->NoBuses = 1;
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} else {
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//
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// PCI device not found.
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//
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return(FALSE);
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}
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}
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} else {
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//
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// PCI device not found.
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//
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return(FALSE);
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}
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return(TRUE);
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}
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