bsps: Move startup files to bsps

Adjust build support files to new directory layout.

This patch is a part of the BSP source reorganization.

Update #3285.

bsps/arm/raspberrypi/start/cmdline.c

@@ -0,0 +1,55 @@
+/**
+ * @file
+ *
+ * @ingroup raspberrypi
+ *
+ * @brief mailbox support.
+ */
+/*
+ * Copyright (c) 2015 Yang Qiao
+ *
+ *  The license and distribution terms for this file may be
+ *  found in the file LICENSE in this distribution or at
+ *
+ *  http://www.rtems.org/license/LICENSE
+ *
+ */
+
+#include <bsp.h>
+#include <bsp/vc.h>
+
+#include <string.h>
+
+#define MAX_CMDLINE_LENGTH 1024
+static int rpi_cmdline_ready = -1;
+static char rpi_cmdline_cached[MAX_CMDLINE_LENGTH] = "force .data placement";
+static bcm2835_get_cmdline_entries rpi_cmdline_entries;
+
+const char *rpi_cmdline_get_raw(void)
+{
+  memset(&rpi_cmdline_entries, 0, sizeof(rpi_cmdline_entries));
+  if (bcm2835_mailbox_get_cmdline(&rpi_cmdline_entries) < 0)
+     return NULL;
+  return rpi_cmdline_entries.cmdline;
+}
+
+const char *rpi_cmdline_get_cached(void)
+{
+  if (rpi_cmdline_ready <= 0) {
+    const char *line = rpi_cmdline_get_raw();
+    if (line != NULL)
+      strncpy(rpi_cmdline_cached, line, MAX_CMDLINE_LENGTH - 1);
+    rpi_cmdline_cached[MAX_CMDLINE_LENGTH - 1] = 0;
+    rpi_cmdline_ready = 1;
+  }
+  return rpi_cmdline_cached;
+}
+
+const char *rpi_cmdline_get_arg(const char* arg)
+{
+  const char *opt_data;
+  opt_data = strstr(rpi_cmdline_get_cached(), arg);
+  if (opt_data)
+    opt_data += strlen(arg);
+  return opt_data;
+}