From 7a1a84ea74fdd06a7f5f239f4c5f4b727d6cd232 Mon Sep 17 00:00:00 2001
From: Rui Miguel Silva <rui.silva@linaro.org>
Date: Thu, 24 Jun 2021 09:25:00 +0100
Subject: [PATCH 01/24] cmd: load: add load command for memory mapped

cp.b is used a lot as a way to load binaries to memory and execute
them, however we may need to integrate this with the efi subsystem to
set it up as a bootdev.

So, introduce a loadm command that will be consistent with the other
loadX commands and will call the efi API's.

ex: loadm $kernel_addr $kernel_addr_r $kernel_size

with this a kernel with CONFIG_EFI_STUB enabled will be loaded and
then subsequently booted with bootefi command.

Signed-off-by: Rui Miguel Silva <rui.silva@linaro.org>
---
 README                           |  1 +
 cmd/Kconfig                      |  6 ++++
 cmd/bootefi.c                    | 12 ++++++++
 cmd/load.c                       | 48 ++++++++++++++++++++++++++++++++
 include/efi_loader.h             |  2 ++
 lib/efi_loader/efi_device_path.c |  9 ++++++
 6 files changed, 78 insertions(+)

diff --git a/README b/README
index b7ab6e50708d..cd76f95e74c1 100644
--- a/README
+++ b/README
@@ -2578,6 +2578,7 @@ rarpboot- boot image via network using RARP/TFTP protocol
 diskboot- boot from IDE devicebootd   - boot default, i.e., run 'bootcmd'
 loads	- load S-Record file over serial line
 loadb	- load binary file over serial line (kermit mode)
+loadm   - load binary blob from source address to destination address
 md	- memory display
 mm	- memory modify (auto-incrementing)
 nm	- memory modify (constant address)
diff --git a/cmd/Kconfig b/cmd/Kconfig
index 09193b61b95f..ba2f321ae989 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -1143,6 +1143,12 @@ config CMD_LOADB
 	help
 	  Load a binary file over serial line.
 
+config CMD_LOADM
+	bool "loadm"
+	default y
+	help
+	  Load a binary over memory mapped.
+
 config CMD_LOADS
 	bool "loads"
 	default y
diff --git a/cmd/bootefi.c b/cmd/bootefi.c
index 827fcd97dfd8..37ce659fa123 100644
--- a/cmd/bootefi.c
+++ b/cmd/bootefi.c
@@ -34,6 +34,18 @@ static struct efi_device_path *bootefi_device_path;
 static void *image_addr;
 static size_t image_size;
 
+/**
+ * efi_get_image_parameters() - return image parameters
+ *
+ * @img_addr:		address of loaded image in memory
+ * @img_size:		size of loaded image
+ */
+void efi_get_image_parameters(void **img_addr, size_t *img_size)
+{
+	*img_addr = image_addr;
+	*img_size = image_size;
+}
+
 /**
  * efi_clear_bootdev() - clear boot device
  */
diff --git a/cmd/load.c b/cmd/load.c
index 7e4a552d90ef..1224a7f85bb3 100644
--- a/cmd/load.c
+++ b/cmd/load.c
@@ -1063,6 +1063,44 @@ static ulong load_serial_ymodem(ulong offset, int mode)
 
 #endif
 
+#if defined(CONFIG_CMD_LOADM)
+static int do_load_memory_bin(struct cmd_tbl *cmdtp, int flag, int argc,
+			      char *const argv[])
+{
+	ulong	addr, dest, size;
+	void	*src, *dst;
+
+	if (argc != 4)
+		return CMD_RET_USAGE;
+
+	addr = simple_strtoul(argv[1], NULL, 16);
+
+	dest = simple_strtoul(argv[2], NULL, 16);
+
+	size = simple_strtoul(argv[3], NULL, 16);
+
+	if (!size) {
+		printf("loadm: can not load zero bytes\n");
+		return 1;
+	}
+
+	src = map_sysmem(addr, size);
+	dst = map_sysmem(dest, size);
+
+	memcpy(dst, src, size);
+
+	unmap_sysmem(src);
+	unmap_sysmem(dst);
+
+	if (IS_ENABLED(CONFIG_CMD_BOOTEFI))
+		efi_set_bootdev("Mem", "", "", map_sysmem(dest, 0), size);
+
+	printf("loaded bin to memory: size: %lu\n", size);
+
+	return 0;
+}
+#endif
+
 /* -------------------------------------------------------------------- */
 
 #if defined(CONFIG_CMD_LOADS)
@@ -1137,3 +1175,13 @@ U_BOOT_CMD(
 );
 
 #endif	/* CONFIG_CMD_LOADB */
+
+#if defined(CONFIG_CMD_LOADM)
+U_BOOT_CMD(
+	loadm, 4, 0,	do_load_memory_bin,
+	"load binary blob from source address to destination address",
+	"[src_addr] [dst_addr] [size]\n"
+	"     - load a binary blob from one memory location to other"
+	" from src_addr to dst_addr by size bytes"
+);
+#endif /* CONFIG_CMD_LOADM */
diff --git a/include/efi_loader.h b/include/efi_loader.h
index 11930fbea838..5b41985244e2 100644
--- a/include/efi_loader.h
+++ b/include/efi_loader.h
@@ -591,6 +591,8 @@ efi_status_t efi_load_pe(struct efi_loaded_image_obj *handle,
 void efi_save_gd(void);
 /* Call this to relocate the runtime section to an address space */
 void efi_runtime_relocate(ulong offset, struct efi_mem_desc *map);
+/* Call this to get image parameters */
+void efi_get_image_parameters(void **img_addr, size_t *img_size);
 /* Add a new object to the object list. */
 void efi_add_handle(efi_handle_t obj);
 /* Create handle */
diff --git a/lib/efi_loader/efi_device_path.c b/lib/efi_loader/efi_device_path.c
index 171661b89727..2493d7432613 100644
--- a/lib/efi_loader/efi_device_path.c
+++ b/lib/efi_loader/efi_device_path.c
@@ -1158,6 +1158,8 @@ efi_status_t efi_dp_from_name(const char *dev, const char *devnr,
 {
 	struct blk_desc *desc = NULL;
 	struct disk_partition fs_partition;
+	size_t image_size;
+	void *image_addr;
 	int part = 0;
 	char *filename;
 	char *s;
@@ -1173,6 +1175,13 @@ efi_status_t efi_dp_from_name(const char *dev, const char *devnr,
 	} else if (!strcmp(dev, "Uart")) {
 		if (device)
 			*device = efi_dp_from_uart();
+	} else if (!strcmp(dev, "Mem")) {
+		efi_get_image_parameters(&image_addr, &image_size);
+
+		if (device)
+			*device = efi_dp_from_mem(EFI_RESERVED_MEMORY_TYPE,
+						  (uintptr_t)image_addr,
+						  image_size);
 	} else {
 		part = blk_get_device_part_str(dev, devnr, &desc, &fs_partition,
 					       1);
-- 
2.37.1