pc386: Add --disable-com1-com4 boot argument

c/src/lib/libbsp/i386/pc386/console/conscfg.c

@@ -1,11 +1,13 @@
-/*
+/**
- *  This file contains the libchip configuration information
+ * @file
- *  to instantiate the libchip driver for the VGA console
+ *
- *  and serial ports on a PC.
+ * This file contains the libchip configuration information
+ * to instantiate the libchip driver for the VGA console
+ * and serial ports on a PC.
  */
 
 /*
- *  COPYRIGHT (c) 1989-2014.
+ *  COPYRIGHT (c) 1989-2014, 2016.
  *  On-Line Applications Research Corporation (OAR).
  *
  *  The license and distribution terms for this file may be
@@ -13,8 +15,6 @@
  *  http://www.rtems.org/license/LICENSE.
  */
 
-#include <unistd.h> /* write */
-
 #include <bsp.h>
 #include <libchip/serial.h>
 #include <libchip/ns16550.h>
@@ -23,7 +23,6 @@
 #endif
 #include <bsp/irq.h>
 #include <rtems/pci.h>
-#include <bsp/rtd316.h>
 
 #if BSP_ENABLE_VGA
 #define VGA_CONSOLE_FUNCTIONS  &vgacons_fns
@@ -49,7 +48,7 @@
   static uint8_t com_get_register(uint32_t addr, uint8_t i)
   {
     register uint8_t val;
-  
+
     inport_byte( (addr + i),val );
     return val;
   }
@@ -58,6 +57,8 @@
   {
     outport_byte( (addr + i),val );
   }
+
+  extern bool pc386_com1_com4_enabled(int);
 #endif
 
 #if (BSP_IS_EDISON == 1 )
@@ -68,7 +69,7 @@ console_tbl     Console_Configuration_Ports[] = {
 #if (BSP_IS_EDISON == 1)
   {
     "/dev/vgacons",                        /* sDeviceName */
-    -1,                                     /* deviceType */
+    -1,                                    /* deviceType */
     &edison_fns,                           /* pDeviceFns */
     NULL,                                  /* deviceProbe */
     NULL,                                  /* pDeviceFlow */
@@ -112,7 +113,7 @@ console_tbl     Console_Configuration_Ports[] = {
     "/dev/com1",                           /* sDeviceName */
     SERIAL_NS16550,                        /* deviceType */
     COM_CONSOLE_FUNCTIONS,                 /* pDeviceFns */
-    NULL,                                  /* deviceProbe, assume it is there */
+    pc386_com1_com4_enabled,               /* deviceProbe */
     NULL,                                  /* pDeviceFlow */
     16,                                    /* ulMargin */
     8,                                     /* ulHysteresis */
@@ -131,7 +132,7 @@ console_tbl     Console_Configuration_Ports[] = {
     "/dev/com2",                           /* sDeviceName */
     SERIAL_NS16550,                        /* deviceType */
     COM_CONSOLE_FUNCTIONS,                 /* pDeviceFns */
-    NULL,                                  /* deviceProbe, assume it is there */
+    pc386_com1_com4_enabled,               /* deviceProbe */
     NULL,                                  /* pDeviceFlow */
     16,                                    /* ulMargin */
     8,                                     /* ulHysteresis */
@@ -151,7 +152,7 @@ console_tbl     Console_Configuration_Ports[] = {
     "/dev/com3",                           /* sDeviceName */
     SERIAL_NS16550,                        /* deviceType */
     COM_CONSOLE_FUNCTIONS,                 /* pDeviceFns */
-    NULL,                                  /* deviceProbe, assume it is there */
+    pc386_com1_com4_enabled,               /* deviceProbe */
     NULL,                                  /* pDeviceFlow */
     16,                                    /* ulMargin */
     8,                                     /* ulHysteresis */
@@ -171,7 +172,7 @@ console_tbl     Console_Configuration_Ports[] = {
     "/dev/com4",                           /* sDeviceName */
     SERIAL_NS16550,                        /* deviceType */
     COM_CONSOLE_FUNCTIONS,                 /* pDeviceFns */
-    NULL,                                  /* deviceProbe, assume it is there */
+    pc386_com1_com4_enabled,               /* deviceProbe */
     NULL,                                  /* pDeviceFlow */
     16,                                    /* ulMargin */
     8,                                     /* ulHysteresis */

c/src/lib/libbsp/i386/pc386/console/console_select.c

@@ -31,6 +31,22 @@
   #include <crt.h>
 #endif
 
+/*
+ * Forward prototype
+ */
+extern bool pc386_com1_com4_enabled(int);
+
+/*
+ * This method is used to determine if COM1-COM4 are enabled based upon
+ * boot command line arguments.
+ */
+static bool are_com1_com4_enabled;
+
+bool pc386_com1_com4_enabled(int minor)
+{
+  return are_com1_com4_enabled;
+}
+
 /*
  * Method to return true if the device associated with the
  * minor number probs available.
@@ -103,6 +119,22 @@ static bool bsp_find_console_entry(
   return false;
 }
 
+static void parse_com1_com4_enable(void)
+{
+  static const char *opt;
+
+  /*
+   * Check the command line to see if com1-com4 are disabled.
+   */
+  opt = bsp_cmdline_arg("--disable-com1-com4");
+  if ( opt ) {
+    printk( "Disable COM1-COM4 per boot argument\n" );
+    are_com1_com4_enabled = false;
+  } else {
+    are_com1_com4_enabled = true;
+  }
+}
+
 static bool parse_printk_or_console(
   const char                *param,
   rtems_device_minor_number *minor_out
@@ -197,6 +229,11 @@ void pc386_parse_console_arguments(void)
    */
   console_initialize_data();
 
+  /*
+   * Determine if COM1-COM4 were disabled.
+   */
+  parse_com1_com4_enable();
+
   /*
    * Assume that if only --console is specified, that printk() should
    * follow that selection by default.

c/src/lib/libbsp/shared/console.c

@@ -117,12 +117,12 @@ void console_register_devices(
    */
   Console_Port_Data = realloc(
     Console_Port_Data,
-    Console_Port_Count * sizeof(console_tbl *)
+    Console_Port_Count * sizeof(console_data)
   );
   if ( Console_Port_Data == NULL ) {
     bsp_fatal( BSP_FATAL_CONSOLE_NO_MEMORY_2 );
   }
-  memset(&Console_Port_Data, '\0', Console_Port_Count * sizeof(console_tbl *));
+  memset(Console_Port_Data, '\0', Console_Port_Count * sizeof(console_data));
 
   /*
    *  Now add the new devices at the end.