xtensa: ISS: update kernel command line in platform_setup

Move platform_setup call higher in initialization sequence so that it
could change kernel command line.
Check command line passed to simulator in ISS platform_stup and update
kernel command line if there's anything.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>

arch/xtensa/kernel/setup.c

@@ -317,8 +317,9 @@ static inline int mem_reserve(unsigned long start, unsigned long end)
 
 void __init setup_arch(char **cmdline_p)
 {
-	strlcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
 	*cmdline_p = command_line;
+	platform_setup(cmdline_p);
+	strlcpy(boot_command_line, *cmdline_p, COMMAND_LINE_SIZE);
 
 	/* Reserve some memory regions */
 
@@ -379,8 +380,6 @@ void __init setup_arch(char **cmdline_p)
 
 	unflatten_and_copy_device_tree();
 
-	platform_setup(cmdline_p);
-
 #ifdef CONFIG_SMP
 	smp_init_cpus();
 #endif

arch/xtensa/platforms/iss/setup.c

@@ -8,13 +8,15 @@
  *          Joe Taylor <joe@tensilica.com>
  *
  * Copyright 2001 - 2005 Tensilica Inc.
+ * Copyright 2017 Cadence Design Systems Inc.
  *
  * This program is free software; you can redistribute  it and/or modify it
  * under  the terms of  the GNU General  Public License as published by the
  * Free Software Foundation;  either version 2 of the  License, or (at your
  * option) any later version.
  *
  */
+#include <linux/bootmem.h>
 #include <linux/stddef.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
@@ -76,5 +78,24 @@ static struct notifier_block iss_panic_block = {
 
 void __init platform_setup(char **p_cmdline)
 {
+	int argc = simc_argc();
+	int argv_size = simc_argv_size();
+
+	if (argc > 1) {
+		void **argv = alloc_bootmem(argv_size);
+		char *cmdline = alloc_bootmem(argv_size);
+		int i;
+
+		cmdline[0] = 0;
+		simc_argv((void *)argv);
+
+		for (i = 1; i < argc; ++i) {
+			if (i > 1)
+				strcat(cmdline, " ");
+			strcat(cmdline, argv[i]);
+		}
+		*p_cmdline = cmdline;
+	}
+
 	atomic_notifier_chain_register(&panic_notifier_list, &iss_panic_block);
 }