diff mbox series

[Concept,09/17] efi: app: Detect running under QEMU

Message ID 20251006232236.2091941-10-sjg@u-boot.org
State New
Headers
Series expo: Complete mouse operation in the EFI app |

Commit Message

Simon Glass Oct. 6, 2025, 11:21 p.m. UTC 
  From: Simon Glass <sjg@chromium.org>

When the app is running under QEMU we may wish to do some things
differently. Add a flag for this and use the SMBIOS tables to detect it.

Co-developed-by: Claude <noreply@anthropic.com>
Signed-off-by: Simon Glass <sjg@chromium.org>
---

 include/asm-generic/global_data.h |  6 ++++++
 lib/efi_client/efi_app.c          | 25 ++++++++++++++++++++++++-
 2 files changed, 30 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/include/asm-generic/global_data.h b/include/asm-generic/global_data.h
index 8b59df66ec5..cff9066de53 100644
--- a/include/asm-generic/global_data.h
+++ b/include/asm-generic/global_data.h
@@ -764,6 +764,12 @@  enum gd_flags {
 	 * For now, this just avoids console output on startup
 	 */
 	GD_FLG_ULIB = 0x10000000,
+	/**
+	 * @GD_FLG_EMUL: Running in an emulator (e.g. QEMU)
+	 *
+	 * Detected from SMBIOS or other platform information
+	 */
+	GD_FLG_EMUL = 0x20000000,
 };
 
 #if CONFIG_IS_ENABLED(ULIB)
diff --git a/lib/efi_client/efi_app.c b/lib/efi_client/efi_app.c
index 00003c27ec5..1d5a88b4827 100644
--- a/lib/efi_client/efi_app.c
+++ b/lib/efi_client/efi_app.c
@@ -22,6 +22,7 @@ 
 #include <image.h>
 #include <init.h>
 #include <malloc.h>
+#include <smbios.h>
 #include <sysreset.h>
 #include <u-boot/uuid.h>
 #include <asm/global_data.h>
@@ -179,6 +180,27 @@  static void scan_tables(struct efi_system_table *sys_table)
 	}
 }
 
+static bool detect_emulator(void)
+{
+	struct smbios_info info;
+	struct smbios_type1 *t1;
+	const char *manufacturer;
+
+	/* Check if running in QEMU by looking at SMBIOS manufacturer */
+	if (!smbios_locate(gd_smbios_start(), &info)) {
+		t1 = (void *)smbios_get_header(&info,
+					SMBIOS_SYSTEM_INFORMATION);
+		if (t1) {
+			manufacturer = smbios_get_string(&t1->hdr,
+						t1->manufacturer);
+			if (manufacturer && !strcmp(manufacturer, "QEMU"))
+				return true;
+		}
+	}
+
+	return false;
+}
+
 static void find_protocols(struct efi_priv *priv)
 {
 	efi_guid_t guid = EFI_DEVICE_PATH_TO_TEXT_PROTOCOL_GUID;
@@ -415,7 +437,8 @@  efi_status_t EFIAPI efi_main(efi_handle_t image,
 
 	printf("starting\n");
 
-	board_init_f(GD_FLG_SKIP_RELOC);
+	board_init_f(GD_FLG_SKIP_RELOC |
+		     (detect_emulator() ? GD_FLG_EMUL : 0));
 	gd = gd->new_gd;
 	board_init_r(NULL, 0);
 	free_memory(priv);