efi_loader: Support loading a ramdisk with bootefi

It is sometimes useful to be able to boot via EFI using a ramdisk. Add
support for this.

Fix a 'specifiy' typo while here.

Series-to: heinrich
Series-version: 1
Series-changes: 1
- Drop mention of the '-' argument-value as it is not needed

Fixes: #8

cmd/bootefi.c

@@ -133,23 +133,34 @@ static int do_bootefi(struct cmd_tbl *cmdtp, int flag, int argc,
 {
 	efi_status_t ret;
 	char *p;
-	void *fdt, *image_buf;
-	unsigned long addr, size;
+	void *fdt, *ramdisk = NULL, *image_buf;
+	unsigned long addr, size, rd_len = 0, fdt_addr = 0;
 	void *image_addr;
 	size_t image_size;
 
 	if (argc < 2)
 		return CMD_RET_USAGE;
 
-	if (argc > 2) {
-		uintptr_t fdt_addr;
+	if (argc > 3) {
+		ulong rd_addr = 0;
+		char *end = NULL;
 
+		rd_addr = hextoul(argv[2], NULL);
+		end = strchr(argv[2], ':');
+		if (!end)
+			return CMD_RET_USAGE;
+		rd_len = hextoul(++end, NULL);
+		ramdisk = map_sysmem(rd_addr, rd_len);
+		fdt_addr = hextoul(argv[3], NULL);
+	} else if (argc > 2) {
 		fdt_addr = hextoul(argv[2], NULL);
-		fdt = map_sysmem(fdt_addr, 0);
-	} else {
-		fdt = EFI_FDT_USE_INTERNAL;
 	}
 
+	if (fdt_addr)
+		fdt = map_sysmem(fdt_addr, 0);
+	else
+		fdt = EFI_FDT_USE_INTERNAL;
+
 	if (IS_ENABLED(CONFIG_CMD_BOOTEFI_BOOTMGR) &&
 	    !strcmp(argv[1], "bootmgr")) {
 		ret = efi_bootmgr_run(fdt);
@@ -212,7 +223,7 @@ static int do_bootefi(struct cmd_tbl *cmdtp, int flag, int argc,
 		}
 	}
 
-	ret = efi_binary_run(image_buf, size, fdt, NULL, 0);
+	ret = efi_binary_run(image_buf, size, fdt, ramdisk, rd_len);
 
 	if (ret != EFI_SUCCESS)
 		return CMD_RET_FAILURE;
@@ -221,7 +232,7 @@ static int do_bootefi(struct cmd_tbl *cmdtp, int flag, int argc,
 }
 
 U_BOOT_LONGHELP(bootefi,
-	"<image address>[:<image size>] [<fdt address>]\n"
+	"<image address>[:<image size>] [<ramdisk_address>:<size>] [<fdt address>]\n"
 	"  - boot EFI payload\n"
 #ifdef CONFIG_CMD_BOOTEFI_HELLO
 	"bootefi hello\n"

doc/usage/cmd/bootefi.rst

@@ -12,7 +12,7 @@ Synopsis
 
 ::
 
-    bootefi <image_addr>[:<image_size>] [<fdt_addr>]
+    bootefi <image_addr>[:<image_size>] [<ramdisk_addr>] [<fdt_addr>]
     bootefi bootmgr [<fdt_addr>]
     bootefi hello [<fdt_addr>]
     bootefi selftest [<fdt_addr>]
@@ -51,11 +51,20 @@ The value of the environment variable *bootargs* is converted from UTF-8 to
 UTF-16 and passed as load options in the loaded image protocol to the UEFI
 binary.
 
+Note: The 'bootefi' command accepts one, two or three arguments. When two
+arguments are provided, the second one is interpreted as `fdt_addr`. When three
+are provided, the second one is interpreted as `ramdisk_addr` and the third as
+`fdt_addr`.
+
 image_addr
     Address of the UEFI binary.
 
+ramdisk_addr
+    Address of the ramdisk or '-'. If no address is specified, a ramdisk is not
+    used when booting.
+
 fdt_addr
-    Address of the device-tree or '-'. If no address is specifiy, the
+    Address of the device-tree or '-'. If no address is specified, the
     environment variable $fdt_addr is used as first fallback, the address of
     U-Boot's internal device-tree $fdtcontroladdr as second fallback.
     When using ACPI no device-tree shall be specified.