Re: PCI support

[Marco Gerards]

Robert Millan <address@hidden> writes:

> On Wed, Jan 30, 2008 at 09:08:34PM +0100, Marco Gerards wrote:
>> Robert Millan <address@hidden> writes:
>> 
>> > On Wed, Jan 30, 2008 at 06:57:38PM +0100, Marco Gerards wrote:
>> >> Marco Gerards <address@hidden> writes:
>> >> 
>> >> > 2009-01-28  Marco Gerards  <address@hidden>
>> >> >
>> >> >         * bus/pci.c: New file.
>> >> >
>> >> >         * include/grub/pci.h: Likewise.
>> >> >
>> >> >         * include/grub/i386/pc/pci.h: Likewise.
>> >> >
>> >> >         * commands/lspci.c: Likewise.
>> >> >
>> >> >         * conf/i386-pc.rmk (pkglib_MODULES): Add `pci.mod' and
>> >> >         `lspci.mod'.
>> >> >         (pci_mod_SOURCES): New variable.
>> >> >         (pci_mod_CFLAGS): Likewise.
>> >> >         (pci_mod_LDFLAGS): Likewise.
>> >> >         (lspci_mod_SOURCES): Likewise.
>> >> >         (lspci_mod_CFLAGS): Likewise.
>> >> >         (lspci_mod_LDFLAGS): Likewise.  
>> >> 
>> >> No objections?  Did everyone have a (quick) look at the interfaces?
>> >
>> > You put grub_pci_read() in an arch-specific file;  is that function really
>> > arch-specific, or only its IO addresses are?
>> 
>> IO addresses are Intel only, AFAIK.  Almost all architectures have
>> mmapped IO.  It's really arch specific.
>
> Are you sure that makes grub_inl / grub_outl arch-specific ?  They can't be
> implemented as wrappers for direct memory access?

No, AFAIK that is not possible.  However, PCI gives you the mmapped IO
addresses we can use, for example for the ATA driver.

--
Marco