Re: pci_read_config_byte ?

[Angelo Dell'Aera <buffer@antifork.org>]

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On Sat, 08 Nov 2003 00:13:49 -0800
Eric Lin <qlyz@sbcglobal.net> wrote:

>Try to understanding how pci_read_config_byte is implemented.
>
>Search the kernel source, find only prototype in pci.h
>
>I am using 2.4.22 on i386.
>
>Can someone help?

Take a look at drivers/pci/pci.c. It's defined in this manner but its code
should be clearly understandable. 

#define PCI_byte_BAD 0

#define PCI_OP(rw,size,type) \
int pci_##rw##_config_##size (struct pci_dev *dev, int pos, type value) \
{                                                                       \
        int res;                                                        \
        unsigned long flags;                                            \
        if (PCI_##size##_BAD) return PCIBIOS_BAD_REGISTER_NUMBER;       \
        spin_lock_irqsave(&pci_lock, flags);                            \
        res = dev->bus->ops->rw##_##size(dev, pos, value);              \
        spin_unlock_irqrestore(&pci_lock, flags);                       \
        return res;                                                     \
}

PCI_OP(read, byte, u8 *)

Regards.

- --

Angelo Dell'Aera 'buffer' 
Antifork Research, Inc.	  	http://buffer.antifork.org

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