qemu: load e820 from fw_cfg

qemu 1.7+ provides a fw_cfg file named "etc/e820" with e820-like entries
for reservations and ram regions.  Use it for ram detection if present,
otherwise fallback to the traditional cmos method.

Change-Id: Icac6c99d2a053e59dfdd28e48d1ceb3d56a61bdc
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-on: http://review.coreboot.org/4030
Tested-by: build bot (Jenkins)

1 files changed, 6 insertions, 0 deletions

diff --git a/src/mainboard/emulation/qemu-i440fx/fw_cfg_if.h b/src/mainboard/emulation/qemu-i440fx/fw_cfg_if.h
index d159f12d09..80e628032b 100644
--- a/src/mainboard/emulation/qemu-i440fx/fw_cfg_if.h
+++ b/src/mainboard/emulation/qemu-i440fx/fw_cfg_if.h
@@ -51,3 +51,9 @@ typedef struct FWCfgFiles {
     uint32_t  count;
     FWCfgFile f[];
 } FWCfgFiles;
+
+typedef struct FwCfgE820Entry {
+    uint64_t address;
+    uint64_t length;
+    uint32_t type;
+} FwCfgE820Entry __attribute((__aligned__(4)));