bootstage: Plumb in bootstage calls for basic operations

This inserts bootstage calls into tftp, usb start and bootm. We
could go further, but this is a reasonable start to illustrate
the concept.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/common/cmd_bootm.c b/common/cmd_bootm.c
index fd9f3e9..d88f6c0 100644
--- a/common/cmd_bootm.c
+++ b/common/cmd_bootm.c
@@ -199,6 +199,8 @@
 
 	bootm_start_lmb();
 
+	bootstage_mark_name(BOOTSTAGE_ID_BOOTM_START, "bootm_start");
+
 	/* get kernel image header, start address and length */
 	os_hdr = boot_get_kernel(cmdtp, flag, argc, argv,
 			&images, &images.os.image_start, &images.os.image_len);
diff --git a/common/cmd_net.c b/common/cmd_net.c
index 6139188..65f32bce 100644
--- a/common/cmd_net.c
+++ b/common/cmd_net.c
@@ -43,7 +43,12 @@
 
 int do_tftpb (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 {
-	return netboot_common(TFTPGET, cmdtp, argc, argv);
+	int ret;
+
+	bootstage_mark_name(BOOTSTAGE_KERNELREAD_START, "tftp_start");
+	ret = netboot_common(TFTPGET, cmdtp, argc, argv);
+	bootstage_mark_name(BOOTSTAGE_KERNELREAD_STOP, "tftp_done");
+	return ret;
 }
 
 U_BOOT_CMD(
diff --git a/common/cmd_usb.c b/common/cmd_usb.c
index 4a86590..9eba271 100644
--- a/common/cmd_usb.c
+++ b/common/cmd_usb.c
@@ -513,6 +513,7 @@
 
 	if ((strncmp(argv[1], "reset", 5) == 0) ||
 		 (strncmp(argv[1], "start", 5) == 0)) {
+		bootstage_mark_name(BOOTSTAGE_ID_USB_START, "usb_start");
 		usb_stop();
 		printf("(Re)start USB...\n");
 		i = usb_init();