File S390-0006--S390-Add-firmware-code.patch of Package kvm.853

From 7e400236dd966e25e98e31fa1e2a0acf99f72f97 Mon Sep 17 00:00:00 2001
From: Alexander Graf <agraf@suse.de>
Date: Thu, 1 Apr 2010 18:25:59 +0200
Subject: [PATCH] [S390] Add firmware code

This patch adds a firmware blob to the S390 target. The blob is a simple
implementation of a virtio client that tries to read the second stage
bootloader from sectors described as of offset 0x20 in the MBR.

In combination with an updated zipl this allows for booting from virtio
block devices. This firmware is built from the same sources as the second
stage bootloader. You can find a virtio capable s390-tools in this repo:

git://repo.or.cz/s390-tools.git

Signed-off-by: Alexander Graf <agraf@suse.de>

---

v1 -> v2:

  - Update bootloader code to support booting from non-virtio aware
    zipl disks. Now you don't need to modify zipl in the guest anymore
    just to boot.
  - Add safety checks
  - Add documentation on where to find the sources
  - Make bios optional

v2 -> v3:

  - Add brackets

v3 -> v4:

  - Add s390-zipl.rom to BLOBs
---
 Makefile              |    3 ++-
 hw/s390-virtio.c      |   26 ++++++++++++++++++++++++++
 pc-bios/README        |    5 +++++
 pc-bios/s390-zipl.rom |  Bin 0 -> 3344 bytes
 4 files changed, 33 insertions(+), 1 deletions(-)
 create mode 100755 pc-bios/s390-zipl.rom

Index: qemu-kvm-0.12.3/Makefile
===================================================================
--- qemu-kvm-0.12.3.orig/Makefile
+++ qemu-kvm-0.12.3/Makefile
@@ -295,7 +295,8 @@ pxe-e1000.bin pxe-i82559er.bin \
 pxe-ne2k_pci.bin pxe-pcnet.bin \
 pxe-rtl8139.bin pxe-virtio.bin \
 bamboo.dtb petalogix-s3adsp1800.dtb \
-multiboot.bin linuxboot.bin
+multiboot.bin linuxboot.bin \
+s390-zipl.rom
 BLOBS += extboot.bin
 BLOBS += vapic.bin
 else
Index: qemu-kvm-0.12.3/hw/s390-virtio.c
===================================================================
--- qemu-kvm-0.12.3.orig/hw/s390-virtio.c
+++ qemu-kvm-0.12.3/hw/s390-virtio.c
@@ -53,6 +53,10 @@
 #define INITRD_PARM_SIZE                0x010410UL
 #define PARMFILE_START                  0x001000UL
 
+#define ZIPL_START			0x009000UL
+#define ZIPL_LOAD_ADDR			0x009000UL
+#define ZIPL_FILENAME			"s390-zipl.rom"
+
 #define MAX_BLK_DEVS                    10
 
 static VirtIOS390Bus *s390_bus;
@@ -193,6 +197,28 @@ static void s390_init(ram_addr_t ram_siz
         //cpu_synchronize_state(env);
         env->psw.addr = KERN_IMAGE_START;
         env->psw.mask = 0x0000000180000000ULL;
+    } else {
+        ram_addr_t bios_size = 0;
+        char *bios_filename;
+
+        /* Load zipl bootloader */
+        if (bios_name == NULL) {
+            bios_name = ZIPL_FILENAME;
+        }
+
+        bios_filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
+        bios_size = load_image(bios_filename, qemu_get_ram_ptr(ZIPL_LOAD_ADDR));
+
+        if ((long)bios_size < 0) {
+            hw_error("could not load bootloader '%s'\n", bios_name);
+        }
+
+        if (bios_size > 4096) {
+            hw_error("stage1 bootloader is > 4k\n");
+        }
+
+        env->psw.addr = ZIPL_START;
+        env->psw.mask = 0x0000000180000000ULL;
     }
 
     if (initrd_filename) {
Index: qemu-kvm-0.12.3/pc-bios/README
===================================================================
--- qemu-kvm-0.12.3.orig/pc-bios/README
+++ qemu-kvm-0.12.3/pc-bios/README
@@ -27,3 +27,8 @@
   virtio 1af4:1000
 
   http://rom-o-matic.net/
+
+- The S390 zipl loader is an addition to the official IBM s390-tools
+  package. That fork is maintained in its own git repository at:
+  git://repo.or.cz/s390-tools.git
+