Linux_SDK_V0.9.5Linux_SDK_V0.9.5

1 files changed, 94 insertions, 0 deletions

diff --git a/lib/efi_loader/helloworld.c b/lib/efi_loader/helloworld.c
new file mode 100644
index 00000000..9ae2ee33
--- /dev/null
+++ b/lib/efi_loader/helloworld.c
@@ -0,0 +1,94 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * EFI hello world
+ *
+ * Copyright (c) 2016 Google, Inc
+ * Written by Simon Glass <sjg@chromium.org>
+ *
+ * This program demonstrates calling a boottime service.
+ * It writes a greeting and the load options to the console.
+ */
+
+#include <common.h>
+#include <efi_api.h>
+
+static const efi_guid_t loaded_image_guid = EFI_LOADED_IMAGE_PROTOCOL_GUID;
+static const efi_guid_t fdt_guid = EFI_FDT_GUID;
+static const efi_guid_t acpi_guid = EFI_ACPI_TABLE_GUID;
+static const efi_guid_t smbios_guid = SMBIOS_TABLE_GUID;
+
+/**
+ * efi_main() - entry point of the EFI application.
+ *
+ * @handle:	handle of the loaded image
+ * @systable:	system table
+ * @return:	status code
+ */
+efi_status_t EFIAPI efi_main(efi_handle_t handle,
+			     struct efi_system_table *systable)
+{
+	struct efi_simple_text_output_protocol *con_out = systable->con_out;
+	struct efi_boot_services *boottime = systable->boottime;
+	struct efi_loaded_image *loaded_image;
+	efi_status_t ret;
+	efi_uintn_t i;
+	u16 rev[] = L"0.0.0";
+
+	/* UEFI requires CR LF */
+	con_out->output_string(con_out, L"Hello, world!\r\n");
+
+	/* Print the revision number */
+	rev[0] = (systable->hdr.revision >> 16) + '0';
+	rev[4] = systable->hdr.revision & 0xffff;
+	for (; rev[4] >= 10;) {
+		rev[4] -= 10;
+		++rev[2];
+	}
+	/* Third digit is only to be shown if non-zero */
+	if (rev[4])
+		rev[4] += '0';
+	else
+		rev[3] = 0;
+
+	con_out->output_string(con_out, L"Running on UEFI ");
+	con_out->output_string(con_out, rev);
+	con_out->output_string(con_out, L"\r\n");
+
+	/* Get the loaded image protocol */
+	ret = boottime->handle_protocol(handle, &loaded_image_guid,
+					(void **)&loaded_image);
+	if (ret != EFI_SUCCESS) {
+		con_out->output_string
+			(con_out, L"Cannot open loaded image protocol\r\n");
+		goto out;
+	}
+	/* Find configuration tables */
+	for (i = 0; i < systable->nr_tables; ++i) {
+		if (!memcmp(&systable->tables[i].guid, &fdt_guid,
+			    sizeof(efi_guid_t)))
+			con_out->output_string
+					(con_out, L"Have device tree\r\n");
+		if (!memcmp(&systable->tables[i].guid, &acpi_guid,
+			    sizeof(efi_guid_t)))
+			con_out->output_string
+					(con_out, L"Have ACPI 2.0 table\r\n");
+		if (!memcmp(&systable->tables[i].guid, &smbios_guid,
+			    sizeof(efi_guid_t)))
+			con_out->output_string
+					(con_out, L"Have SMBIOS table\r\n");
+	}
+	/* Output the load options */
+	con_out->output_string(con_out, L"Load options: ");
+	if (loaded_image->load_options_size && loaded_image->load_options)
+		con_out->output_string(con_out,
+				       (u16 *)loaded_image->load_options);
+	else
+		con_out->output_string(con_out, L"<none>");
+	con_out->output_string(con_out, L"\r\n");
+
+out:
+	boottime->exit(handle, ret, 0, NULL);
+
+	/* We should never arrive here */
+	return ret;
+}