Re: ��c code �л��PNP��ϵ��ڴ��ր

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From: ��ʿ��
Date: Wed, 31 Dec 1997 00:00

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�� �� cxl.bbs@bbs.njtu.edu.cn (gege) �Ĵ������ᵽ: ��
: �����������
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: PNP how to know its start addr. maping
: 


�����PCI����һЩԴ����
��������PCI���ģ��ҵ�֮�󣬴�
configuration space �ж���
base address M/IO
��� 1. PCI specification
         2.  NTDDK  document


#define	PCI_ADDRESS		0x0cf8
#define	PCI_DATA		0x0cfc

int	PCI_BUS_PRESENT(void)
{
	static	done=FALSE;
	ULONG	i;
	USHORT	j;
		
	if (done) return TRUE;

	// try Mechanism first
	for (i=0x80000000;i<0x80010000;i+=0x00000800)
	{
		outpd(PCI_ADDRESS,i);
		if (inpw(PCI_DATA)==0xffff)	continue;
		outpd(PCI_ADDRESS,i+0x08);
		if (inpw(PCI_DATA+2)!=0x0600)	continue;		// not Host Bridge
		done=TRUE;
		return	TRUE;
	}
--
[1;36m�� ��Դ:����ˮ˼Դվ bbs.sjtu.edu.cn��[FROM: www]

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From: jazzman.bbs@bbs.sjtu.edu.cn (��ʿ��)
Subject: Re: �����c code �л��PNP���ϵ��ڴ���ր
Date: 1997/12/31
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Re: �����c code �л��PNP���ϵ��ڴ���ր

Re: ��c code �л��PNP��ϵ��ڴ��ր