File prefix-Add-a-generic-raw-image-prefix-bs.patch of Package qemu.37352
From: Michael Brown <mcb30@ipxe.org>
Date: Thu, 18 Feb 2021 12:13:12 +0000
Subject: [prefix] Add a generic raw image prefix ((bsc#1219733, bsc#1219722)
Provide a generic raw image prefix, which assumes that the iPXE image
has been loaded in its entirety on a paragraph boundary.
The resulting .raw image can be loaded via RPL using an rpld.conf file
such as:
HOST {
ethernet = 00:00:00:00:00:00/6;
FILE {
path="ipxe.raw";
load=0x2000;
};
execute=0x2000;
};
Debugged-by: Johannes Heimansberg <git@jhe.dedyn.io>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
(cherry picked from commit 22bb29eabc2f68f3e60e99df4ef33984b7795a49)
References: bsc#1219733
References: bsc#1219722
Signed-off-by: Dario Faggioli <dfaggioli@suse.com>
---
src/arch/x86/prefix/rawprefix.S | 53 +++++++++++++++++++++++++++++++++
1 file changed, 53 insertions(+)
diff --git a/roms/ipxe/src/arch/x86/prefix/rawprefix.S b/roms/ipxe/src/arch/x86/prefix/rawprefix.S
new file mode 100644
index 0000000000000000000000000000000000000000..4cf5f391e0d6f40e84209bc529cb686a8d580146
--- /dev/null
+++ b/roms/ipxe/src/arch/x86/prefix/rawprefix.S
@@ -0,0 +1,53 @@
+/*
+ * Raw binary prefix
+ *
+ * Assumes that entire image is already loaded as a contiguous block
+ * on a paragraph boundary and entered in real mode.
+ *
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL )
+
+ .text
+ .arch i386
+ .org 0
+ .code16
+
+#include <librm.h>
+
+ .section ".prefix", "ax", @progbits
+ .globl _raw_start
+_raw_start:
+
+ /* Adjust %cs so that %cs:0000 is the start of the image */
+ movw %cs, %ax
+ call 1f
+1: popw %bx
+ subw $1b, %bx
+ shrw $4, %bx
+ addw %bx, %ax
+ pushw %ax
+ pushw $2f
+ lret
+2:
+ /* Install iPXE */
+ call install
+
+ /* Set up real-mode stack */
+ movw %bx, %ss
+ movw $_estack16, %sp
+
+ /* Jump to .text16 segment */
+ pushw %ax
+ pushw $1f
+ lret
+ .section ".text16", "awx", @progbits
+1:
+ /* Run iPXE */
+ virtcall main
+
+ /* Uninstall iPXE */
+ call uninstall
+
+ /* Boot next device */
+ int $0x18
