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