[Qemu-devel] [PATCH 2/4] prep: Add ELF support

["Andreas Färber" <andreas.faerber@web.de>]

In order to switch from abondoned OpenHack'Ware to OpenBIOS firmware,
the PReP machine needs to be able to load an ELF BIOS.

ELF loading is adapted from ppc_newworld, the fallback mechanism from sun4m.

Note that since we must register the maximum amount of ROM before attempting
to load an ELF BIOS and since there is no cpu_unregister_physical_memory(),
raw BIOS files such as OHW may now be preceded by unused ROM memory.

Cc: Alexander Graf <agraf@suse.de>
Cc: Hervé Poussineau <hpoussin@reactos.org>
Signed-off-by: Andreas Färber <andreas.faerber@web.de>
---
 hw/ppc_prep.c |   24 +++++++++++++++---------
 1 files changed, 15 insertions(+), 9 deletions(-)

diff --git a/hw/ppc_prep.c b/hw/ppc_prep.c
index 6b22122..3575dee 100644
--- a/hw/ppc_prep.c
+++ b/hw/ppc_prep.c
@@ -36,6 +36,7 @@
 #include "qemu-log.h"
 #include "ide.h"
 #include "loader.h"
+#include "elf.h"
 #include "mc146818rtc.h"
 #include "blockdev.h"
 
@@ -582,18 +583,23 @@ static void ppc_prep_init (ram_addr_t ram_size,
         bios_name = BIOS_FILENAME;
     filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
     if (filename) {
-        bios_size = get_image_size(filename);
+        cpu_register_physical_memory(0xfff00000, BIOS_SIZE,
+                                     bios_offset | IO_MEM_ROM);
+        bios_size = load_elf(filename, NULL, NULL, NULL,
+                             NULL, NULL, 1, ELF_MACHINE, 0);
+        if (bios_size < 0 || bios_size > BIOS_SIZE) {
+            bios_size = get_image_size(filename);
+            if (bios_size > 0 && bios_size <= BIOS_SIZE) {
+                target_phys_addr_t bios_addr;
+                bios_size = (bios_size + 0xfff) & ~0xfff;
+                bios_addr = (uint32_t)(-bios_size);
+                bios_size = load_image_targphys(filename, bios_addr,
+                                                bios_size);
+            }
+        }
     } else {
         bios_size = -1;
     }
-    if (bios_size > 0 && bios_size <= BIOS_SIZE) {
-        target_phys_addr_t bios_addr;
-        bios_size = (bios_size + 0xfff) & ~0xfff;
-        bios_addr = (uint32_t)(-bios_size);
-        cpu_register_physical_memory(bios_addr, bios_size,
-                                     bios_offset | IO_MEM_ROM);
-        bios_size = load_image_targphys(filename, bios_addr, bios_size);
-    }
     if (bios_size < 0 || bios_size > BIOS_SIZE) {
         hw_error("qemu: could not load PPC PREP bios '%s'\n", bios_name);
     }
-- 
1.7.3