Thread View: cn.bbs.comp.program
1 messages
1 total messages
Started by gege
Thu, 01 Jan 1998 00:00
Re: �����c code �л��PNP���ϵ��ڴ���ր
Author: gege
Date: Thu, 01 Jan 1998 00:00
Date: Thu, 01 Jan 1998 00:00
38 lines
1709 bytes
1709 bytes
��лָ�㣡�������ԡ�
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��� 1. PCI specification
2. NTDDK document
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�� �� jazzman.bbs@bbs.sjtu.edu.cn (��ʿ��) �Ĵ������ᵽ: ��
: �����PCI����һЩԴ����
: ��������PCI���ģ��ҵ�֮��
: configuration space ���
: 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;
: }
v
--
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