arm/raspberrypi: add cmdline support for rpi bsp.

c/src/lib/libbsp/arm/raspberrypi/Makefile.am

@@ -95,6 +95,7 @@ libbsp_a_SOURCES += ../shared/arm-cp15-set-ttb-entries.c
 # Startup
 libbsp_a_SOURCES += ../../shared/bspreset_loop.c
 libbsp_a_SOURCES += startup/bspstart.c
+libbsp_a_SOURCES += startup/cmdline.c
 
 # IRQ
 libbsp_a_SOURCES += ../shared/arm-cp15-set-exception-handler.c

c/src/lib/libbsp/arm/raspberrypi/include/bsp.h

@@ -7,6 +7,7 @@
  */
 
 /*
+ * Copyright (c) 2015 Yang Qiao
  * Copyright (c) 2013 Alan Cudmore
  *
  *  The license and distribution terms for this file may be
@@ -35,6 +36,11 @@ extern "C" {
 #define BSP_GPIO_PINS_PER_BANK 32
 #define BSP_GPIO_PINS_PER_SELECT_BANK 10
 
+void rpi_init_cmdline(void);
+const char *rpi_cmdline_get_cached(void);
+const char *rpi_cmdline_get_raw(void);
+const char *rpi_cmdline_get_arg(const char* arg);
+
 #ifdef __cplusplus
 }
 #endif /* __cplusplus */

c/src/lib/libbsp/arm/raspberrypi/startup/cmdline.c

@@ -0,0 +1,47 @@
+/**
+ * @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>
+
+#define MAX_CMDLINE_LENGTH 1024
+static int rpi_cmdline_ready;
+static char rpi_cmdline_cached[MAX_CMDLINE_LENGTH];
+static bcm2835_get_cmdline_entries rpi_cmdline_entries;
+
+const char *rpi_cmdline_get_raw(void)
+{
+  memset(&rpi_cmdline_entries, 0, sizeof(rpi_cmdline_entries));
+  bcm2835_mailbox_get_cmdline(&rpi_cmdline_entries);
+  return rpi_cmdline_entries.cmdline;
+}
+
+const char *rpi_cmdline_get_cached(void)
+{
+  if (!rpi_cmdline_ready) {
+    const char *line = rpi_cmdline_get_raw();
+    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)
+{
+  return strstr (rpi_cmdline_get_cached(), arg);
+}