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From: Arvind Sankar <nivedita@alum.mit.edu>
To: Ard Biesheuvel <ardb@kernel.org>
Cc: linux-efi@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	lersek@redhat.com, leif@nuviainc.com, pjones@redhat.com,
	mjg59@google.com, agraf@csgraf.de, daniel.kiper@oracle.com,
	hdegoede@redhat.com, nivedita@alum.mit.edu,
	mbrown@fensystems.co.uk, mingo@kernel.org
Subject: Re: [RFC PATCH 2/3] efi/x86: add true mixed mode entry point into .compat section
Date: Thu, 13 Feb 2020 11:59:03 -0500	[thread overview]
Message-ID: <20200213165902.GA1400002@rani.riverdale.lan> (raw)
In-Reply-To: <20200213145928.7047-3-ardb@kernel.org>

On Thu, Feb 13, 2020 at 03:59:27PM +0100, Ard Biesheuvel wrote:
> Currently, mixed mode is closely tied to the EFI handover protocol
> and relies on intimate knowledge of the bootparams structure, setup
> header etc, all of which are rather byzantine and entirely specific
> to x86.
> 
> Even though no other EFI supported architectures are currently known
> that could support something like mixed mode, it makes sense to
> abstract a bit from this, and make it part of a generic Linux on EFI
> boot protocol.
> 
> To that end, add a .compat section to the mixed mode binary, and populate
> it with the PE machine type and entry point address, allowing firmware
> implementations to match it to their native machine type, and invoke
> non-native binaries using a secondary entry point.

This patch refers to efi32_pe_entry which is only defined in the next
one.

WARNING: multiple messages have this Message-ID
From: Arvind Sankar <nivedita@alum.mit.edu>
To: Ard Biesheuvel <ardb@kernel.org>
Cc: linux-efi@vger.kernel.org, agraf@csgraf.de,
	daniel.kiper@oracle.com, mjg59@google.com,
	mbrown@fensystems.co.uk, hdegoede@redhat.com,
	nivedita@alum.mit.edu, pjones@redhat.com, leif@nuviainc.com,
	lersek@redhat.com, mingo@kernel.org,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [RFC PATCH 2/3] efi/x86: add true mixed mode entry point into .compat section
Date: Thu, 13 Feb 2020 11:59:03 -0500	[thread overview]
Message-ID: <20200213165902.GA1400002@rani.riverdale.lan> (raw)
In-Reply-To: <20200213145928.7047-3-ardb@kernel.org>

On Thu, Feb 13, 2020 at 03:59:27PM +0100, Ard Biesheuvel wrote:
> Currently, mixed mode is closely tied to the EFI handover protocol
> and relies on intimate knowledge of the bootparams structure, setup
> header etc, all of which are rather byzantine and entirely specific
> to x86.
> 
> Even though no other EFI supported architectures are currently known
> that could support something like mixed mode, it makes sense to
> abstract a bit from this, and make it part of a generic Linux on EFI
> boot protocol.
> 
> To that end, add a .compat section to the mixed mode binary, and populate
> it with the PE machine type and entry point address, allowing firmware
> implementations to match it to their native machine type, and invoke
> non-native binaries using a secondary entry point.

This patch refers to efi32_pe_entry which is only defined in the next
one.

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  reply	other threads:[~2020-02-13 16:59 UTC|newest]

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-13 14:59 [RFC PATCH 0/3] efi/x86: add support for generic EFI mixed mode boot Ard Biesheuvel
2020-02-13 14:59 ` Ard Biesheuvel
2020-02-13 14:59 ` [RFC PATCH 1/3] efi/x86: drop redundant .bss section Ard Biesheuvel
2020-02-13 14:59   ` Ard Biesheuvel
2020-02-13 14:59 ` [RFC PATCH 2/3] efi/x86: add true mixed mode entry point into .compat section Ard Biesheuvel
2020-02-13 14:59   ` Ard Biesheuvel
2020-02-13 16:59   ` Arvind Sankar [this message]
2020-02-13 16:59     ` Arvind Sankar
2020-02-13 17:13     ` Ard Biesheuvel
2020-02-13 17:13       ` Ard Biesheuvel
2020-02-13 14:59 ` [RFC PATCH 3/3] efi/x86: implement mixed mode boot without the handover protocol Ard Biesheuvel
2020-02-13 14:59   ` Ard Biesheuvel
2020-02-13 17:23   ` Arvind Sankar
2020-02-13 17:23     ` Arvind Sankar
2020-02-13 17:42     ` Ard Biesheuvel
2020-02-13 17:42       ` Ard Biesheuvel
2020-02-13 17:53 ` [RFC PATCH 0/3] efi/x86: add support for generic EFI mixed mode boot Arvind Sankar
2020-02-13 17:53   ` Arvind Sankar
2020-02-13 17:55   ` Ard Biesheuvel
2020-02-13 17:55     ` Ard Biesheuvel
2020-02-13 18:47     ` Arvind Sankar
2020-02-13 18:47       ` Arvind Sankar
2020-02-13 22:36       ` Ard Biesheuvel
2020-02-13 22:36         ` Ard Biesheuvel
2020-02-14  0:10         ` Arvind Sankar
2020-02-14  0:10           ` Arvind Sankar
2020-02-14  0:12           ` Arvind Sankar
2020-02-14  0:12             ` Arvind Sankar
2020-02-14  0:21             ` Ard Biesheuvel
2020-02-14  0:21               ` Ard Biesheuvel
2020-02-14  0:38               ` Arvind Sankar
2020-02-14  0:38                 ` Arvind Sankar

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