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From b745ae34559366ccc158f5782cfb81eeb054d62f Mon Sep 17 00:00:00 2001
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From: Alex Williamson <alex.williamson@redhat.com>
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Date: Mon, 3 Mar 2014 18:47:09 +0100
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Subject: [PATCH 3/7] Store boot bus:dev.fn address as autoboot device location
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RH-Author: Alex Williamson <alex.williamson@redhat.com>
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Message-id: <20140303184709.19235.66132.stgit@bling.home>
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Patchwork-id: 57978
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O-Subject: [RHEL7 ipxe PATCH 3/4] [romprefix] Store boot bus:dev.fn address as autoboot device location
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Bugzilla: 1031518
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RH-Acked-by: Gerd Hoffmann <kraxel@redhat.com>
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RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>
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RH-Acked-by: Vlad Yasevich <vyasevic@redhat.com>
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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Bugzilla: 1031518
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Upstream: c429bf0aa2428e6d12143285b29cbaf6a82f8d84
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Per the BIOS Boot Specification, the initialization phase of the ROM
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is called with the PFA (PCI Function Address) in the %ax register.
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The intention is that the ROM code will store that device address
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somewhere and use it for booting from that device when the Boot Entry
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Vector (BEV) is called. iPXE does store the PFA, but doesn't use it
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to select the boot network device. This renders BIOS IPL lists fairly
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ineffective.
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Fix by using the BBS-specified bus:dev.fn address as the autoboot
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device location.
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Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
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Modified-by: Michael Brown <mcb30@ipxe.org>
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Signed-off-by: Michael Brown <mcb30@ipxe.org>
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---
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src/arch/i386/prefix/romprefix.S | 12 +++++++++++-
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1 file changed, 11 insertions(+), 1 deletion(-)
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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src/arch/i386/prefix/romprefix.S | 12 +++++++++++-
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1 files changed, 11 insertions(+), 1 deletions(-)
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diff --git a/src/arch/i386/prefix/romprefix.S b/src/arch/i386/prefix/romprefix.S
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index 091673d..c75b9b9 100644
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--- a/src/arch/i386/prefix/romprefix.S
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+++ b/src/arch/i386/prefix/romprefix.S
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@@ -742,7 +742,17 @@ exec: /* Set %ds = %cs */
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pushw $1f
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lret
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.section ".text16", "awx", @progbits
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-1: /* Call main() */
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+1:
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+ /* Retrieve PCI bus:dev.fn */
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+ movw init_pci_busdevfn, %cx
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+
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+ /* Set up %ds for access to .data16 */
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+ movw %bx, %ds
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+
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+ /* Store PCI bus:dev.fn */
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+ movw %cx, autoboot_busdevfn
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+
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+ /* Call main() */
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pushl $main
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pushw %cs
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call prot_call
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--
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1.7.1
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