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SubjectRe: [PATCH 5/5] x86_64 EFI support -v3: EFI document
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On Mon, 2007-07-30 at 22:40 -0600, Eric W. Biederman wrote:
> "Huang, Ying" <ying.huang@intel.com> writes:
>
> > This patch adds document for EFI x86_64 support. The boot parameters
> > added are documented in Documentation/i386/zero-page.txt. The setup
> > and operation guide of EFI based system is documented in
> > Documentation/x86_64/uefi.txt.
> >
> > Signed-off-by: Chandramouli Narayanan <mouli@linux.intel.com>
> > Signed-off-by: Huang Ying <ying.huang@intel.com>
> >
> > ---
> >
> > i386/zero-page.txt | 18 ++++++++++++++----
> > x86_64/uefi.txt | 42 ++++++++++++++++++++++++++++++++++++++++++
> > 2 files changed, 56 insertions(+), 4 deletions(-)
> >
> > Index: linux-2.6.23-rc1/Documentation/i386/zero-page.txt
> > ===================================================================
> > --- linux-2.6.23-rc1.orig/Documentation/i386/zero-page.txt 2007-07-30
> > 11:28:45.000000000 +0800
> > +++ linux-2.6.23-rc1/Documentation/i386/zero-page.txt 2007-07-30
> > 11:29:28.000000000 +0800
> > @@ -31,11 +31,11 @@
> > 0xb0 - 0x13f Free. Add more parameters here if you really need them.
> > 0x140- 0x1be EDID_INFO Video mode setup
> >
> > -0x1c4 unsigned long EFI system table pointer
> > -0x1c8 unsigned long EFI memory descriptor size
> > -0x1cc unsigned long EFI memory descriptor version
> > +0x1c4 unsigned long EFI system table pointer*
> > +0x1c8 unsigned long EFI memory descriptor size*
> > +0x1cc unsigned long EFI memory descriptor version*
> > 0x1d0 unsigned long EFI memory descriptor map pointer
> > -0x1d4 unsigned long EFI memory descriptor map size
> > +0x1d4 unsigned long EFI memory descriptor map size*
> > 0x1e0 unsigned long ALT_MEM_K, alternative mem check, in Kb
> > 0x1e4 unsigned long Scratch field for the kernel setup code
> > 0x1e8 char number of entries in E820MAP (below)
> > @@ -87,3 +87,13 @@
> > 0x2d0 - 0xd00 E820MAP
> > 0xd00 - 0xeff EDDBUF (edd.S) for disk signature read sector
> > 0xd00 - 0xeeb EDDBUF (edd.S) for edd data
> > +
> > +Changes for x86_64 implementation:
> > +---------------------------------
> > +For alignment purposes, the following parameters are rearranged.
> > +
> > +0x1b8 unsigned long EFI system table pointer
> > +0x1c0 unsigned long EFI Loader signature
> > +0x1c4 unsigned long EFI memory descriptor size
> > +0x1c8 unsigned long EFI memory descriptor version
> > +0x1cc unsigned long EFI memory descriptor map size
>
> Huh? It is the same protocol. Unless there are specific issues such
> as pointers being to small we should remain 100% the same for both
> arch/i386 and arch/x86_64 This variation looks like a serious
> bug.

The parameters are rearranged, because the pointer is too small. For
example, the EFI system table pointer is 8 bytes in x86_64, while it is
4 bytes in i386.

Best Regards,
Huang Ying
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