From:	satoh AT asd DOT tnes DOT nec DOT co DOT jp
Message-Id:	<199811050719.QAA01519@asd.tnes.nec.co.jp>
X-My-Real-Login-Name:	satoh; asd01.asd.tnes.nec.co.jp
MIME-Version:	1.0
X-Mailer:	Denshin 8 Go V321.1b7
Date:	Thu, 05 Nov 1998 16:16:11 +0900
To:	djgpp AT delorie DOT com
Subject:	PCI BIOS call
Reply-To:	djgpp AT delorie DOT com

Hi,all.

I'm writing a PCI device driver using gcc compiler (DJGPP V2).
In this driver, I use a PCI BIOS function to find my PCI device.
When I try to execute this program under Win95 DOS-BOX, MS-DOS
(CWSDPMI.EXE), This source works fine.
But when under Win98 DOS-BOX, this source does not work.

Why? Does Win98 DOS-BOX differ from Win95 DOS-BOX?

Thanks in advance.

-----<< Source List >>----------------------------------------

    #define PCI_FUNCTION_ID    0xb1
    #define FIND_PCI_DEVICE    0x02
    #define READ_CONFIG_BYTE   0x08
    #define READ_CONFIG_WORD   0x09
    #define READ_CONFIG_DWORD  0x0a
    #define WRITE_CONFIG_BYTE  0x0b
    #define WRITE_CONFIG_WORD  0x0c
    #define WRITE_CONFIG_DWORD 0x0d
    
    
    int PCI_find(struct PCI_ID *pci_id, unsigned short int vendor_id,
                 unsigned short int device_id)
    {
        union REGS    inregs;
        union REGS    outregs;
        int           ret_code;
        
        inregs.h.ah = (unsigned char)PCI_FUNCTION_ID;
        inregs.h.al = (unsigned char)FIND_PCI_DEVICE;
        inregs.w.cx = (unsigned short)device_id;
        inregs.w.dx = (unsigned short)vendor_id;
        inregs.w.si = (unsigned long int)0;
        
        int86(0x1a, &inregs, &outregs);
    
        ret_code = (int)outregs.h.ah;
        if (ret_code == 0) {
            pci_id->bus_num = outregs.h.bh;
            pci_id->device_num = outregs.h.bl;
        } else {
            ret_code = 1;
        }
        return ret_code;
    }



---------------------------------  Masayuki Satoh

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