[uboot] create uboot from github:

repo: https://github.com/u-boot/u-boot
	commit: d80bb749fab53da72c4a0e09b8c2d2aaa3103c91

Change-Id: Ie6434426e1ec15bc08bb1832798e371f3fd5fb29

u-boot-2021.10/lib/efi_loader/efi_bootmgr.c

@@ -0,0 +1,201 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ *  EFI boot manager
+ *
+ *  Copyright (c) 2017 Rob Clark
+ */
+
+#define LOG_CATEGORY LOGC_EFI
+
+#include <common.h>
+#include <charset.h>
+#include <log.h>
+#include <malloc.h>
+#include <efi_loader.h>
+#include <efi_variable.h>
+#include <asm/unaligned.h>
+
+static const struct efi_boot_services *bs;
+static const struct efi_runtime_services *rs;
+
+/*
+ * bootmgr implements the logic of trying to find a payload to boot
+ * based on the BootOrder + BootXXXX variables, and then loading it.
+ *
+ * TODO detecting a special key held (f9?) and displaying a boot menu
+ * like you would get on a PC would be clever.
+ *
+ * TODO if we had a way to write and persist variables after the OS
+ * has started, we'd also want to check OsIndications to see if we
+ * should do normal or recovery boot.
+ */
+
+/**
+ * try_load_entry() - try to load image for boot option
+ *
+ * Attempt to load load-option number 'n', returning device_path and file_path
+ * if successful. This checks that the EFI_LOAD_OPTION is active (enabled)
+ * and that the specified file to boot exists.
+ *
+ * @n:			number of the boot option, e.g. 0x0a13 for Boot0A13
+ * @handle:		on return handle for the newly installed image
+ * @load_options:	load options set on the loaded image protocol
+ * Return:		status code
+ */
+static efi_status_t try_load_entry(u16 n, efi_handle_t *handle,
+				   void **load_options)
+{
+	struct efi_load_option lo;
+	u16 varname[] = L"Boot0000";
+	u16 hexmap[] = L"0123456789ABCDEF";
+	void *load_option;
+	efi_uintn_t size;
+	efi_status_t ret;
+
+	varname[4] = hexmap[(n & 0xf000) >> 12];
+	varname[5] = hexmap[(n & 0x0f00) >> 8];
+	varname[6] = hexmap[(n & 0x00f0) >> 4];
+	varname[7] = hexmap[(n & 0x000f) >> 0];
+
+	load_option = efi_get_var(varname, &efi_global_variable_guid, &size);
+	if (!load_option)
+		return EFI_LOAD_ERROR;
+
+	ret = efi_deserialize_load_option(&lo, load_option, &size);
+	if (ret != EFI_SUCCESS) {
+		log_warning("Invalid load option for %ls\n", varname);
+		goto error;
+	}
+
+	if (lo.attributes & LOAD_OPTION_ACTIVE) {
+		u32 attributes;
+
+		log_debug("%s: trying to load \"%ls\" from %pD\n",
+			  __func__, lo.label, lo.file_path);
+
+		ret = EFI_CALL(efi_load_image(true, efi_root, lo.file_path,
+					      NULL, 0, handle));
+		if (ret != EFI_SUCCESS) {
+			log_warning("Loading %ls '%ls' failed\n",
+				    varname, lo.label);
+			goto error;
+		}
+
+		attributes = EFI_VARIABLE_BOOTSERVICE_ACCESS |
+			     EFI_VARIABLE_RUNTIME_ACCESS;
+		ret = efi_set_variable_int(L"BootCurrent",
+					   &efi_global_variable_guid,
+					   attributes, sizeof(n), &n, false);
+		if (ret != EFI_SUCCESS)
+			goto unload;
+		/* try to register load file2 for initrd's */
+		if (IS_ENABLED(CONFIG_EFI_LOAD_FILE2_INITRD)) {
+			ret = efi_initrd_register();
+			if (ret != EFI_SUCCESS)
+				goto unload;
+		}
+
+		log_info("Booting: %ls\n", lo.label);
+	} else {
+		ret = EFI_LOAD_ERROR;
+	}
+
+	/* Set load options */
+	if (size) {
+		*load_options = malloc(size);
+		if (!*load_options) {
+			ret = EFI_OUT_OF_RESOURCES;
+			goto error;
+		}
+		memcpy(*load_options, lo.optional_data, size);
+		ret = efi_set_load_options(*handle, size, *load_options);
+	} else {
+		*load_options = NULL;
+	}
+
+error:
+	free(load_option);
+
+	return ret;
+
+unload:
+	if (EFI_CALL(efi_unload_image(*handle)) != EFI_SUCCESS)
+		log_err("Unloading image failed\n");
+	free(load_option);
+
+	return ret;
+}
+
+/**
+ * efi_bootmgr_load() - try to load from BootNext or BootOrder
+ *
+ * Attempt to load from BootNext or in the order specified by BootOrder
+ * EFI variable, the available load-options, finding and returning
+ * the first one that can be loaded successfully.
+ *
+ * @handle:		on return handle for the newly installed image
+ * @load_options:	load options set on the loaded image protocol
+ * Return:		status code
+ */
+efi_status_t efi_bootmgr_load(efi_handle_t *handle, void **load_options)
+{
+	u16 bootnext, *bootorder;
+	efi_uintn_t size;
+	int i, num;
+	efi_status_t ret;
+
+	bs = systab.boottime;
+	rs = systab.runtime;
+
+	/* BootNext */
+	size = sizeof(bootnext);
+	ret = efi_get_variable_int(L"BootNext",
+				   &efi_global_variable_guid,
+				   NULL, &size, &bootnext, NULL);
+	if (ret == EFI_SUCCESS || ret == EFI_BUFFER_TOO_SMALL) {
+		/* BootNext does exist here */
+		if (ret == EFI_BUFFER_TOO_SMALL || size != sizeof(u16))
+			log_err("BootNext must be 16-bit integer\n");
+
+		/* delete BootNext */
+		ret = efi_set_variable_int(L"BootNext",
+					   &efi_global_variable_guid,
+					   0, 0, NULL, false);
+
+		/* load BootNext */
+		if (ret == EFI_SUCCESS) {
+			if (size == sizeof(u16)) {
+				ret = try_load_entry(bootnext, handle,
+						     load_options);
+				if (ret == EFI_SUCCESS)
+					return ret;
+				log_warning(
+					"Loading from BootNext failed, falling back to BootOrder\n");
+			}
+		} else {
+			log_err("Deleting BootNext failed\n");
+		}
+	}
+
+	/* BootOrder */
+	bootorder = efi_get_var(L"BootOrder", &efi_global_variable_guid, &size);
+	if (!bootorder) {
+		log_info("BootOrder not defined\n");
+		ret = EFI_NOT_FOUND;
+		goto error;
+	}
+
+	num = size / sizeof(uint16_t);
+	for (i = 0; i < num; i++) {
+		log_debug("%s trying to load Boot%04X\n", __func__,
+			  bootorder[i]);
+		ret = try_load_entry(bootorder[i], handle, load_options);
+		if (ret == EFI_SUCCESS)
+			break;
+	}
+
+	free(bootorder);
+
+error:
+	return ret;
+}