3 files changed, 67 insertions, 0 deletions
diff --git a/hw/uefi/hardware-info.c b/hw/uefi/hardware-info.c
new file mode 100644
index 0000000000..930502a4df
--- /dev/null
+++ b/hw/uefi/hardware-info.c
@@ -0,0 +1,31 @@
+/*
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ *
+ * pass hardware information to uefi
+ *
+ * see OvmfPkg/Library/HardwareInfoLib/ in edk2
+ */
+
+#include "qemu/osdep.h"
+
+#include "hw/nvram/fw_cfg.h"
+#include "hw/uefi/hardware-info.h"
+
+static void      *blob;
+static uint64_t  blobsize;
+
+void hardware_info_register(HARDWARE_INFO_TYPE type, void *info, uint64_t infosize)
+{
+    HARDWARE_INFO_HEADER hdr = {
+        .type.value = cpu_to_le64(type),
+        .size       = cpu_to_le64(infosize),
+    };
+
+    blob = g_realloc(blob, blobsize + sizeof(hdr) + infosize);
+    memcpy(blob + blobsize, &hdr, sizeof(hdr));
+    blobsize += sizeof(hdr);
+    memcpy(blob + blobsize, info, infosize);
+    blobsize += infosize;
+
+    fw_cfg_modify_file(fw_cfg_find(), "etc/hardware-info", blob, blobsize);
+}
diff --git a/hw/uefi/meson.build b/hw/uefi/meson.build
new file mode 100644
index 0000000000..a8b1689412
--- /dev/null
+++ b/hw/uefi/meson.build
@@ -0,0 +1 @@
+system_ss.add(files('hardware-info.c'))
diff --git a/include/hw/uefi/hardware-info.h b/include/hw/uefi/hardware-info.h
new file mode 100644
index 0000000000..94c38cff20
--- /dev/null
+++ b/include/hw/uefi/hardware-info.h
@@ -0,0 +1,35 @@
+/*
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ *
+ * pass hardware information to uefi
+ *
+ * see OvmfPkg/Library/HardwareInfoLib/ in edk2
+ */
+#ifndef QEMU_UEFI_HARDWARE_INFO_H
+#define QEMU_UEFI_HARDWARE_INFO_H
+
+/* data structures */
+
+typedef enum {
+    HardwareInfoTypeUndefined  = 0,
+    HardwareInfoTypeHostBridge = 1,
+    HardwareInfoQemuUefiVars   = 2,
+} HARDWARE_INFO_TYPE;
+
+typedef struct {
+    union {
+        uint64_t            uint64;
+        HARDWARE_INFO_TYPE  value;
+    } type;
+    uint64_t  size;
+} HARDWARE_INFO_HEADER;
+
+typedef struct {
+    uint64_t  mmio_address;
+} HARDWARE_INFO_SIMPLE_DEVICE;
+
+/* qemu functions */
+
+void hardware_info_register(HARDWARE_INFO_TYPE type, void *info, uint64_t size);
+
+#endif /* QEMU_UEFI_HARDWARE_INFO_H */