Inclusion of PC386 BSP submitted by Pedro Miguel Da Cruz Neto Romano

<pmcnr@camoes.rnl.ist.utl.pt> and Jose Rufino <ruf@asterix.ist.utl.pt>
of NavIST (http://pandora.ist.utl.pt/).

6 files changed, 689 insertions, 0 deletions

diff --git a/c/src/lib/libbsp/i386/pc386/startup/Makefile.in b/c/src/lib/libbsp/i386/pc386/startup/Makefile.in
new file mode 100644
index 0000000000..8d86ba9132
--- /dev/null
+++ b/c/src/lib/libbsp/i386/pc386/startup/Makefile.in
@@ -0,0 +1,58 @@
+#
+#  $Id$
+#
+
+@SET_MAKE@
+srcdir = @srcdir@
+top_srcdir = @top_srcdir@
+VPATH=@srcdir@:@srcdir@/../../../shared
+
+PGM=${ARCH}/startup.rel
+
+# C source names, if any, go here -- minus the .c
+C_PIECES=bspstart exit irq sbrk 
+C_FILES=$(C_PIECES:%=%.c)
+C_O_FILES=$(C_PIECES:%=${ARCH}/%.o)
+
+H_FILES=
+
+# Assembly source names, if any, go here -- minus the .s
+S_PIECES=ldsegs
+S_FILES=$(S_PIECES:%=%.s)
+S_O_FILES=$(S_FILES:%.s=${ARCH}/%.o)
+
+SRCS=$(srcdir)/linkcmds $(C_FILES) $(H_FILES) $(S_FILES)
+OBJS=$(C_O_FILES) $(S_O_FILES)
+
+include $(RTEMS_CUSTOM)
+include $(PROJECT_ROOT)/make/leaf.cfg
+
+#
+# (OPTIONAL) Add local stuff here using +=
+#
+
+DEFINES  +=
+CPPFLAGS +=
+CFLAGS   +=
+
+LD_PATHS  +=
+LD_LIBS   +=
+LDFLAGS   +=
+
+#
+# Add your list of files to delete here.  The config files
+#  already know how to delete some stuff, so you may want
+#  to just run 'make clean' first to see what gets missed.
+#  'make clobber' already includes 'make clean'
+#
+
+CLEAN_ADDITIONS +=
+CLOBBER_ADDITIONS +=
+
+${PGM}: ${SRCS} ${OBJS}
+	$(make-rel)
+all:	${ARCH} $(SRCS) $(PGM)
+	$(INSTALL) $(srcdir)/linkcmds ${PROJECT_RELEASE}/lib
+
+# the .rel file built here will be put into libbsp.a by ../wrapup/Makefile
+
diff --git a/c/src/lib/libbsp/i386/pc386/startup/bspstart.c b/c/src/lib/libbsp/i386/pc386/startup/bspstart.c
new file mode 100644
index 0000000000..73c9e6adeb
--- /dev/null
+++ b/c/src/lib/libbsp/i386/pc386/startup/bspstart.c
@@ -0,0 +1,241 @@
+/*-------------------------------------------------------------------------+
+| bspstart.c v1.1 - PC386 BSP - 1997/08/07
++--------------------------------------------------------------------------+
+| This file contains the PC386 BSP startup package. It includes application,
+| board, and monitor specific initialization and configuration. The generic CPU
+| dependent initialization has been performed before this routine is invoked. 
++--------------------------------------------------------------------------+
+| (C) Copyright 1997 -
+| - NavIST Group - Real-Time Distributed Systems and Industrial Automation
+|
+| http://pandora.ist.utl.pt
+|
+| Instituto Superior Tecnico * Lisboa * PORTUGAL
++--------------------------------------------------------------------------+
+| Disclaimer:
+|
+| This file is provided "AS IS" without warranty of any kind, either
+| expressed or implied.
++--------------------------------------------------------------------------+
+| This code is based on:
+|   bspstart.c,v 1.8 1996/05/28 13:12:40 joel Exp - go32 BSP
+| With the following copyright notice:
+| **************************************************************************
+| * COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994.                      *
+| * On-Line Applications Research Corporation (OAR).                       *
+| * All rights assigned to U.S. Government, 1994.                          *
+| *                                                                        *
+| * This material may be reproduced by or for the U.S. Government pursuant *
+| * to the copyright license under the clause at DFARS 252.227-7013.  This *
+| * notice must appear in all copies of this file and its derivatives.     *
+| **************************************************************************
++--------------------------------------------------------------------------*/
+
+
+#include <fcntl.h>
+
+#include <bsp.h>
+#include <libcsupport.h>
+#include <rtems/libio.h>
+ 
+#ifdef STACK_CHECKER_ON
+#include <stackchk.h>
+#endif
+
+/*-------------------------------------------------------------------------+
+| Global Variables
++--------------------------------------------------------------------------*/
+#ifdef RTEMS_SMALL_MEMORY
+extern rtems_unsigned32 _end;           /* End of BSS. Defined in 'linkcmds'. */
+
+rtems_unsigned32 rtemsFreeMemStart = (rtems_unsigned32)&_end;
+                         /* Address of start of free memory - should be updated
+                            after creating new partitions or regions.         */
+#else
+rtems_unsigned32 rtemsFreeMemStart = RAM_START;
+                                             /* RAM_START defined in 'bsp.h'. */
+#endif /* RTEMS_SMALL_MEMORY */
+
+/* The original BSP configuration table from the application and our copy of it
+   with some changes. */
+
+extern rtems_configuration_table  Configuration;
+       rtems_configuration_table  BSP_Configuration;
+
+rtems_cpu_table Cpu_table;                     /* CPU configuration table.    */
+char            *rtems_progname;               /* Program name - from main(). */
+
+
+/*-------------------------------------------------------------------------+
+| External Prototypes
++--------------------------------------------------------------------------*/
+extern void _exit(int);  /* define in exit.c */
+
+/*-------------------------------------------------------------------------+
+|         Function: bsp_libc_init
+|      Description: Initialize whatever libc we are using. Called from
+|                   pretasking hook. 
+| Global Variables: rtemsFreeMemStart.
+|        Arguments: None.
+|          Returns: Nothing. 
++--------------------------------------------------------------------------*/
+static void
+bsp_libc_init(void)
+{
+  if (rtemsFreeMemStart & (CPU_ALIGNMENT - 1))  /* not aligned => align it */
+    rtemsFreeMemStart = (rtemsFreeMemStart+CPU_ALIGNMENT) & ~(CPU_ALIGNMENT-1);
+
+  RTEMS_Malloc_Initialize((void *)rtemsFreeMemStart, HEAP_SIZE << 10, 0);
+  rtemsFreeMemStart += HEAP_SIZE << 10;           /* HEAP_SIZE is in KBytes */
+
+  /* Init the RTEMS libio facility to provide UNIX-like system calls for use by
+     newlib (ie: provide __rtems_open, __rtems_close, etc). Uses malloc()
+     to get area for the iops, so must be after malloc initialization. */
+
+  rtems_libio_init();
+
+  /* Set up for the libc handling. */
+
+  if (BSP_Configuration.ticks_per_timeslice > 0)
+    libc_init(1); /* reentrant if possible */
+  else
+    libc_init(0); /* non-reentrant         */
+} /* bsp_libc_init */
+
+ 
+/*-------------------------------------------------------------------------+
+|         Function: bsp_pretasking_hook
+|      Description: BSP pretasking hook.  Called just before drivers are
+|                   initialized. Used to setup libc and install any BSP
+|                   extensions. NOTE: Must not use libc (to do io) from here,
+|                   since drivers are not yet initialized.
+| Global Variables: None.
+|        Arguments: None.
+|          Returns: Nothing. 
++--------------------------------------------------------------------------*/
+void
+bsp_pretasking_hook(void)
+{
+  bsp_libc_init();
+
+#ifdef STACK_CHECKER_ON
+  /* Initialize the stack bounds checker. We can either turn it on here or from
+     the app. */
+   
+  Stack_check_Initialize();
+
+#endif /* STACK_CHECKER_ON */
+ 
+#ifdef RTEMS_DEBUG
+
+  rtems_debug_enable(RTEMS_DEBUG_ALL_MASK);
+
+#endif /* RTEMS_DEBUG */
+} /* bsp_pretasking_hook */
+ 
+
+/*-------------------------------------------------------------------------+
+|         Function: bsp_postdriver_hook
+|      Description: After drivers are setup, register some "filenames" and open
+|                   stdin, stdout, stderr files. Newlib will automatically
+|                   associate the files with these (it hardcodes the numbers).
+| Global Variables: None.
+|        Arguments: None.
+|          Returns: Nothing. 
++--------------------------------------------------------------------------*/
+void
+bsp_postdriver_hook(void)
+{
+  int stdin_fd, stdout_fd, stderr_fd;
+
+  rtems_status_code error_code;
+ 
+  error_code = 'S' << 24 | 'T' << 16;
+
+  /* open standard devices: stdout, stderr and stdin */
+ 
+  if ((stdin_fd =  __rtems_open("/dev/console", O_RDONLY, 0)) < 0)
+    rtems_fatal_error_occurred( error_code | 'D' << 8 | '0' );
+ 
+  if ((stdout_fd = __rtems_open("/dev/console", O_WRONLY, 0)) < 0)
+    rtems_fatal_error_occurred( error_code | 'D' << 8 | '1' );
+ 
+  if ((stderr_fd = __rtems_open("/dev/console", O_WRONLY, 0)) < 1)
+    rtems_fatal_error_occurred( error_code | 'D' << 8 | '2' );
+ 
+  if ((stdin_fd != 0) || (stdout_fd != 1) || (stderr_fd != 2))
+    rtems_fatal_error_occurred( error_code | 'I' << 8 | 'O' );
+} /* bsp_postdriver_hook */ 
+
+
+/*-------------------------------------------------------------------------+
+|         Function: main
+|      Description: Called from bsp's startup code ('start.s').
+| Global Variables: None.
+|        Arguments: None.
+|          Returns: Nothing. 
++--------------------------------------------------------------------------*/
+int main(int argc, char **argv, char **environp)
+{
+  /* If we don't have command line arguments set default program name. */
+
+  if ((argc > 0) && argv && argv[0])
+    rtems_progname = argv[0];
+  else
+    rtems_progname = "RTEMS";
+
+  Cpu_table.pretasking_hook         = bsp_pretasking_hook; /* init libc, etc. */
+  Cpu_table.predriver_hook          = NULL;                /* use system's    */
+  Cpu_table.postdriver_hook         = bsp_postdriver_hook;
+  Cpu_table.idle_task               = NULL;
+                                          /* do not override system IDLE task */
+  Cpu_table.do_zero_of_workspace    = TRUE;
+  Cpu_table.interrupt_table_segment = get_ds();
+  Cpu_table.interrupt_table_offset  = (void *)Interrupt_descriptor_table;
+  Cpu_table.interrupt_stack_size    = 4096;
+  Cpu_table.extra_mpci_receive_server_stack = 0;
+
+  /* Copy user's table and make necessary adjustments.              */
+
+  BSP_Configuration = Configuration;
+
+  /* Place RTEMS workspace at top of physical RAM (RAM_END defined in 'bsp.h' */
+
+  BSP_Configuration.work_space_start =
+                          (void *)(RAM_END - BSP_Configuration.work_space_size);
+
+  /* Add 1 region for Malloc in libc_low.                           */
+
+  BSP_Configuration.RTEMS_api_configuration->maximum_regions++;
+
+  /* Add 1 extension for newlib libc.                               */
+
+#ifdef RTEMS_NEWLIB
+  BSP_Configuration.maximum_extensions++;
+#endif
+
+  /* Add another extension if using the stack checker.              */
+
+#ifdef STACK_CHECKER_ON
+  BSP_Configuration.maximum_extensions++;
+#endif
+
+  /* Tell libio how many fd's we want and allow it to tweak config. */
+
+  rtems_libio_config(&BSP_Configuration, BSP_LIBIO_MAX_FDS);
+
+  rtems_initialize_executive(&BSP_Configuration, &Cpu_table);
+  /* does not return */
+
+  /*-------------------------------------------------------------------------+
+  | We only return here if the executive has finished. This happens when the
+  | task has called exit(). We will then call _exit() which is part of the bsp.
+  +--------------------------------------------------------------------------*/
+
+  for (;;)
+    _exit(0);
+
+  /* no cleanup necessary for PC386 */
+
+  return 0;
+} /* main */
diff --git a/c/src/lib/libbsp/i386/pc386/startup/exit.c b/c/src/lib/libbsp/i386/pc386/startup/exit.c
new file mode 100644
index 0000000000..b518c71418
--- /dev/null
+++ b/c/src/lib/libbsp/i386/pc386/startup/exit.c
@@ -0,0 +1,73 @@
+/*-------------------------------------------------------------------------+
+| exit.c v1.1 - PC386 BSP - 1997/08/07
++--------------------------------------------------------------------------+
+| Routines to shutdown and reboot the PC.
++--------------------------------------------------------------------------+
+| (C) Copyright 1997 -
+| - NavIST Group - Real-Time Distributed Systems and Industrial Automation
+|
+| http://pandora.ist.utl.pt
+|
+| Instituto Superior Tecnico * Lisboa * PORTUGAL
++--------------------------------------------------------------------------+
+| Disclaimer:
+|
+| This file is provided "AS IS" without warranty of any kind, either
+| expressed or implied.
++--------------------------------------------------------------------------+
+| This code is based on:
+|   exit.c,v 1.2 1995/12/19 20:07:36 joel Exp -  go32 BSP
+| With the following copyright notice:
+| **************************************************************************
+| * COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994.                      *
+| * On-Line Applications Research Corporation (OAR).                       *
+| * All rights assigned to U.S. Government, 1994.                          *
+| *                                                                        *
+| * This material may be reproduced by or for the U.S. Government pursuant *
+| * to the copyright license under the clause at DFARS 252.227-7013.  This *
+| * notice must appear in all copies of this file and its derivatives.     *
+| **************************************************************************
++--------------------------------------------------------------------------*/
+
+
+#include <stdio.h>
+
+#include <bsp.h>
+
+/*-------------------------------------------------------------------------+
+| External Prototypes
++--------------------------------------------------------------------------*/
+extern rtems_boolean _IBMPC_scankey(char *);  /* define in 'inch.c' */
+
+
+/*-------------------------------------------------------------------------+
+|         Function: rtemsReboot
+|      Description: Reboot the PC. 
+| Global Variables: None.
+|        Arguments: None.
+|          Returns: Nothing. 
++--------------------------------------------------------------------------*/
+inline void rtemsReboot(void)
+{
+  /* shutdown and reboot */
+  outport_byte(0x64, 0xFE);        /* use keyboard controler to do the job... */
+} /* rtemsReboot */
+
+
+/*-------------------------------------------------------------------------+
+|         Function: _exit
+|      Description: Shutdown the PC. Called from libc's 'exit'. 
+| Global Variables: None.
+|        Arguments: status - exit status (ignored).
+|          Returns: Nothing. 
++--------------------------------------------------------------------------*/
+void _exit(int status)
+{
+  unsigned char ch;
+  puts("\nEXECUTIVE SHUTDOWN! Any key to reboot...");
+
+  while(!_IBMPC_scankey(&ch))
+    ;
+
+  rtemsReboot();
+} /* _exit */
diff --git a/c/src/lib/libbsp/i386/pc386/startup/ldsegs.s b/c/src/lib/libbsp/i386/pc386/startup/ldsegs.s
new file mode 100644
index 0000000000..507eee92de
--- /dev/null
+++ b/c/src/lib/libbsp/i386/pc386/startup/ldsegs.s
@@ -0,0 +1,205 @@
+/*-------------------------------------------------------------------------+
+| ldsegs.s v1.1 - PC386 BSP - 1997/08/07
++--------------------------------------------------------------------------+
+| This file assists the board independent startup code by loading the proper
+| segment register values. The values loaded are board dependent. In addition
+| it contains code to enable the A20 line and to reprogram the PIC to relocate
+| the IRQ interrupt vectors to 0x20 -> 0x2f.
+| NOTE: No stack has been established when this routine is invoked.
+|	It returns by jumping back to bspentry.
++--------------------------------------------------------------------------+
+| (C) Copyright 1997 -
+| - NavIST Group - Real-Time Distributed Systems and Industrial Automation
+|
+| http://pandora.ist.utl.pt
+|
+| Instituto Superior Tecnico * Lisboa * PORTUGAL
++--------------------------------------------------------------------------+
+| Disclaimer:
+|
+| This file is provided "AS IS" without warranty of any kind, either
+| expressed or implied.
++--------------------------------------------------------------------------+
+| This code is base on:
+|   ldsegs.s,v 1.4 1996/04/20 16:48:30 joel Exp - go32 BSP
+| With the following copyright notice:
+| **************************************************************************
+| * COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994.                      *
+| * On-Line Applications Research Corporation (OAR).                       *
+| * All rights assigned to U.S. Government, 1994.                          *
+| *                                                                        *
+| * This material may be reproduced by or for the U.S. Government pursuant *
+| * to the copyright license under the clause at DFARS 252.227-7013.  This *
+| * notice must appear in all copies of this file and its derivatives.     *
+| **************************************************************************
+|
+| Also based on (from the Linux source tree):
+|   setup.S - Copyright (C) 1991, 1992 Linus Torvalds
++--------------------------------------------------------------------------*/
+
+
+#include "asm.h"
+
+/*----------------------------------------------------------------------------+
+| Constants
++----------------------------------------------------------------------------*/
+.set	PROT_DATA_SEG, 0x10	# offset in gdt
+.set	RESET_SS, PROT_DATA_SEG	# initial value of stack segment register
+.set	RESET_DS, PROT_DATA_SEG	# initial value of data segment register
+.set	RESET_ES, PROT_DATA_SEG	# initial value of extra segment register
+.set	RESET_FS, PROT_DATA_SEG	# initial value of "f" segment register
+.set	RESET_GS, PROT_DATA_SEG	# initial value of "g" segment register
+
+
+/*----------------------------------------------------------------------------+
+| Macros
++----------------------------------------------------------------------------*/
+#define LOAD_SEGMENTS(_value, _segment) \
+	movw	$ ## _value, ax; \
+	movw	ax, _segment
+
+/*----------------------------------------------------------------------------+
+| CODE section
++----------------------------------------------------------------------------*/
+
+BEGIN_CODE
+
+        EXTERN (establish_stack)
+
+/*----------------------------------------------------------------------------+
+| empty_8042
++------------------------------------------------------------------------------
+| This routine checks that the keyboard command queue is empty (after emptying
+| the output buffers).
+| No timeout is used - if this hangs there is something wrong with the machine,
+| and we probably couldn't proceed anyway.
++----------------------------------------------------------------------------*/
+SYM(empty_8042):
+	call	delay
+	inb	$0x64, al	# 8042 status port
+	testb	$0x01, al	# output buffer?
+	jz	SYM(no_output)
+	call	SYM(delay)
+	in	$0x60, al	# read it
+	jmp	SYM(empty_8042)
+SYM(no_output):
+	test	$0x02, al	# is input buffer full?
+	jnz	SYM(empty_8042)	# yes - loop
+	ret
+
+/*----------------------------------------------------------------------------+
+| delay
++------------------------------------------------------------------------------
+| Delay is needed after doing I/O. We do it by writing to a non-existent port.
++----------------------------------------------------------------------------*/
+SYM(delay):
+	outb	al, $0xED	# about 1uS delay
+	ret
+
+/*-------------------------------------------------------------------------+
+|         Function: _load_segments
+|      Description: Load board segment registers with apropriate values + enable
+	            A20 line + reprogram PIC.
+| Global Variables: None.
+|        Arguments: None.
+|          Returns: Nothing. 
++--------------------------------------------------------------------------*/
+        PUBLIC (_load_segments)
+SYM (_load_segments):
+	
+	LOAD_SEGMENTS(RESET_SS, ss)
+	LOAD_SEGMENTS(RESET_DS, ds)
+	LOAD_SEGMENTS(RESET_ES, es)
+	LOAD_SEGMENTS(RESET_FS, fs)
+	LOAD_SEGMENTS(RESET_GS, gs)
+
+	/*---------------------------------------------------------------------+
+	| we have to enable A20 in order to access memory above 1MByte
+	+---------------------------------------------------------------------*/
+
+	call	SYM(empty_8042)
+	movb	$0xD1, al		# command write
+	outb	al, $0x64
+	call	SYM(empty_8042)
+        movb	$0xDF, al		# A20 on
+	outb	al, $0x60
+	call	SYM(empty_8042)
+
+	/*---------------------------------------------------------------------+
+	| Now we have to reprogram the interrupts :-(. We put them right after
+	| the intel-reserved hardware interrupts, at int 0x20-0x2F. There they
+	| won't mess up anything. Sadly IBM really messed this up with the
+	| original PC, and they haven't been able to rectify it afterwards. Thus
+	| the bios puts interrupts at 0x08-0x0f, which is used for the internal
+	| hardware interrupts as well. We just have to reprogram the 8259's, and
+	| it isn't fun.
+	+---------------------------------------------------------------------*/
+
+	movb	$0x11, al		/* initialization sequence          */
+	outb	al, $0x20		/* send it to 8259A-1               */
+	call	SYM(delay)
+	outb	al, $0xA0		/* and to 8259A-2                   */
+	call	SYM(delay)
+	
+	movb	$0x20, al		/* start of hardware int's (0x20)   */
+	outb	al, $0x21
+	call	SYM(delay)
+	movb	$0x28, al		/* start of hardware int's 2 (0x28) */
+	outb	al, $0xA1
+	call	SYM(delay)
+	
+	movb	$0x04, al		/* 8259-1 is master                 */
+	outb	al, $0x21
+	call	SYM(delay)
+	movb	$0x02, al		/* 8259-2 is slave                  */
+	outb	al, $0xA1
+	call	SYM(delay)
+	
+	movb	$0x01, al		/* 8086 mode for both               */
+	outb	al, $0x21
+	call	SYM(delay)
+	outb	al, $0xA1
+	call	SYM(delay)
+	
+	movb	$0xFF, al		/* mask off all interrupts for now  */
+	outb	al, $0xA1
+	call	SYM(delay)
+	movb	$0xFB, al		/* mask all irq's but irq2 which    */
+	outb	al, $0x21		/* is cascaded                      */
+	call	SYM(delay)
+
+	jmp	SYM (_establish_stack)	# return to the bsp entry code
+
+/*-------------------------------------------------------------------------+
+|         Function: _return_to_monitor
+|      Description: Return to board's monitor (we have none so simply restart).
+| Global Variables: None.
+|        Arguments: None.
+|          Returns: Nothing. 
++--------------------------------------------------------------------------*/
+        PUBLIC (_return_to_monitor)
+SYM (_return_to_monitor):
+
+	call	SYM (Timer_exit)
+	call	SYM (Clock_exit)
+	jmp	SYM (start)
+
+END_CODE
+
+/*----------------------------------------------------------------------------+
+| DATA section
++----------------------------------------------------------------------------*/
+
+BEGIN_DATA
+
+        PUBLIC (_Do_Load_IDT)
+SYM (_Do_Load_IDT):
+       .byte 1	# load RTEMS own Interrupt Descriptor Table
+
+        PUBLIC (_Do_Load_GDT)
+SYM (_Do_Load_GDT):
+       .byte 0	# use the Global Descriptor Table that is already defined
+
+END_DATA
+
+END
diff --git a/c/src/lib/libbsp/i386/pc386/startup/linkcmds b/c/src/lib/libbsp/i386/pc386/startup/linkcmds
new file mode 100644
index 0000000000..516d9c3393
--- /dev/null
+++ b/c/src/lib/libbsp/i386/pc386/startup/linkcmds
@@ -0,0 +1,62 @@
+/*-------------------------------------------------------------------------+
+| linkcmds v1.1 - PC386 BSP - 1997/08/07
++--------------------------------------------------------------------------+
+| This file contains directives for the GNU linker which are specific to the
+| PC386 bsp.
++--------------------------------------------------------------------------+
+| (C) Copyright 1997 -
+| - NavIST Group - Real-Time Distributed Systems and Industrial Automation
+|
+| http://pandora.ist.utl.pt
+|
+| Instituto Superior Tecnico * Lisboa * PORTUGAL
++--------------------------------------------------------------------------+
+| Disclaimer:
+|
+| This file is provided "AS IS" without warranty of any kind, either
+| expressed or implied.
++--------------------------------------------------------------------------+
+| This code is based on:
+|   linkcmds,v 1.3 1995/12/19 20:06:58 joel Exp - FORCE CPU386 BSP
+| With the following copyright notice:
+| **************************************************************************
+| * COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994.                      *
+| * On-Line Applications Research Corporation (OAR).                       *
+| * All rights assigned to U.S. Government, 1994.                          *
+| *                                                                        *
+| * This material may be reproduced by or for the U.S. Government pursuant *
+| * to the copyright license under the clause at DFARS 252.227-7013.  This *
+| * notice must appear in all copies of this file and its derivatives.     *
+| **************************************************************************
++--------------------------------------------------------------------------*/
+
+
+SECTIONS
+{
+  .text :
+  {
+    _text_start = . ;
+    *(.text)
+    _etext = ALIGN( 0x10 ) ;
+  }
+  .rodata ADDR( .text ) + SIZEOF( .text ):
+  {
+    _rodata_start = . ;
+    *(.rodata)
+    _erodata = ALIGN( 0x10 ) ;
+  }
+  .data ADDR( .rodata ) + SIZEOF( .rodata ):
+  {
+    _data_start = . ;
+    *(.data)
+    _edata = ALIGN( 0x10 ) ;
+  }
+  .bss ADDR( .data ) + SIZEOF( .data ):
+  {
+    _bss_start = . ;
+    *(.bss)
+    *(COMMON)
+    _end = . ;
+    __end = . ;
+  }
+}
diff --git a/c/src/lib/libbsp/i386/pc386/startup/sbrk.c b/c/src/lib/libbsp/i386/pc386/startup/sbrk.c
new file mode 100644
index 0000000000..851f9ed0e6
--- /dev/null
+++ b/c/src/lib/libbsp/i386/pc386/startup/sbrk.c
@@ -0,0 +1,50 @@
+/*-------------------------------------------------------------------------+
+| sbrk.c v1.1 - PC386 BSP - 1997/08/07
++--------------------------------------------------------------------------+
+| If the BSP wants to dynamically allocate the memory for the C Library heap
+| (malloc) and/or be able to extend the heap, then this routine must be
+| functional. RTEMS newlib suppport has an implementation of malloc using
+| RTEMS regions => the user can do mallocs.
++--------------------------------------------------------------------------+
+| (C) Copyright 1997 -
+| - NavIST Group - Real-Time Distributed Systems and Industrial Automation
+|
+| http://pandora.ist.utl.pt
+|
+| Instituto Superior Tecnico * Lisboa * PORTUGAL
++--------------------------------------------------------------------------+
+| Disclaimer:
+|
+| This file is provided "AS IS" without warranty of any kind, either
+| expressed or implied.
++--------------------------------------------------------------------------+
+| This code is based on:
+|   sbrk.c,v 1.2 1995/12/19 20:07:38 joel Exp - go32 BSP
+| With the following copyright notice:
+| **************************************************************************
+| * COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994.                      *
+| * On-Line Applications Research Corporation (OAR).                       *
+| * All rights assigned to U.S. Government, 1994.                          *
+| *                                                                        *
+| * This material may be reproduced by or for the U.S. Government pursuant *
+| * to the copyright license under the clause at DFARS 252.227-7013.  This *
+| * notice must appear in all copies of this file and its derivatives.     *
+| **************************************************************************
++--------------------------------------------------------------------------*/
+
+
+#include <errno.h>
+#include <sys/types.h>
+
+/*-------------------------------------------------------------------------+
+|         Function: sbrk
+|      Description: Stub for sbrk. 
+| Global Variables: None.
+|        Arguments: Not relevant.
+|          Returns: Not relevant. 
++--------------------------------------------------------------------------*/
+void *sbrk(size_t incr)
+{
+  errno = EINVAL;
+  return (void *)NULL;
+} /* sbrk */