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/*

 *  This file contains directives for the GNU linker which are specific

 *  to the Intel 386ex evaluation board.

 *

 *  COPYRIGHT (c) 1989-1999.

 *  On-Line Applications Research Corporation (OAR).

 *

 *  The license and distribution terms for this file may be

 *  found in the file LICENSE in this distribution or at

 *  http://www.OARcorp.com/rtems/license.html.

 *

 *  $Id: linkcmds,v 1.2 2001-09-27 11:59:47 chris Exp $

 *

 * Memory layout:

 *

 * 0x3f80000 -> 0x3ff0000 : text section

 * 0x3ff0000 -> 0x3ff0028 : global descriptor table in ROM

 * 0x3ff0028 -> 0x3fff000 : data section ( copied by start.s to RAM )

 * 0x3fff000 -> 0x3fffff0 : initial section ( init 386ex, goto protected mode, copy ROM-RAM )

 * 0x3fffff0 -> 0x4000000 : reset section ( jmp to initial only )

 */

        ENTRY(reset) ;

SECTIONS

{

/****************************************************************************************

 * data section:

 *

 * This section defines the locations of the data section in ROM as well as in RAM.

 * start.s copies the data section to RAM in real mode.  This is done PRIOR to the lgdt

 * instruction since the data section contains the Global_descriptor_table and GDTR.

 ***********************************************************************************/

        _rom_data_start = 0x3ff0000;

        _rom_data_segment   = 0xF000;

        _rom_data_offset    = 0x0;

        _ram_data_segment   = 0x0000 ;

        _ram_data_offset    = 0x0;

        _ram_data_location  = _ram_data_segment * 16 + _ram_data_offset;

        .data  :

        AT ( _rom_data_start )

        {

        _sdata = .;

        *(.data);

        _edata = .;

        }

        _data_start       = ADDR(.data) ;

         data_start       = _data_start ;

        _data_size        = _edata - _sdata ;

/**************************************************************************************

 * bss section:

 *

 * The bss section is the last section in RAM.

 *************************************************************************************/

        _edata = ALIGN( 0x10 );

        .bss :

        {

        _bss_start = .;

        *(.bss);

        *(COMMON);

        _ebss = ALIGN(0x10);

        end = _ebss;

        _end = end;

        __end = end;

        }

        _bss_size   = _ebss - _bss_start ;

/**************************************************************************************

 * General variables:

 *

 * The stack_size variable is customizable here.  The heap is located directly after

 * The stack in RAM.  A routine within bspstart.c uses these variables to ensure that

 * the heap used by RTEMS is as large as the RAM remaining after all workspace configurations

 * are complete.

 *************************************************************************************/

        stack_size  = 0x8000 ;

        stack_origin = end + stack_size ;

        heap_bottom  = stack_origin + 4 ;

/***************************************************************************************

 * text section:

 *

 * This section is NOT copied into RAM.  It is left in ROM, as the flash ROM is quick enough.

 ***************************************************************************************/

        .text ( 0x3f80000 ):

        {

         CREATE_OBJECT_SYMBOLS

        text_start = . ;

        _text_start = . ;

        *(.text ) ;

        . = ALIGN (16);

        *(.eh_fram)

        . = ALIGN (16);

        /*

         * C++ constructors

         */

        __CTOR_LIST__ = .;

        LONG((__CTOR_END__ - __CTOR_LIST__) / 4 - 2)

        *(.ctors)

        LONG(0)

        __CTOR_END__ = .;

        . = ALIGN (4) ;

        __DTOR_LIST__ = .;

        LONG((__DTOR_END__ - __DTOR_LIST__) / 4 - 2)

        *(.dtors)

        LONG(0)

        __DTOR_END__ = .;

        _rodata_start 5 . ;

        *(.rodata)

        *(.gnu.linkonce.r*)

        _erodata = ALIGN( 0x10 ) ;

        _etext = ALIGN( 0x10 );

        _endtext = . ;

        }

/*******************************************************************************************

 * initial section:

 *

 * This section is defined after the data section.  It must be in the top 64K of memory

 * to enable the initial short jmp from the reset section while still in real-mode. It

 * initializes the i386ex, moves the gdt from ROM to RAM,loads the gdt,

 * jumps to protected mode, copies the data section from ROM to RAM and loads the idt.

 ******************************************************************************************/

        .initial _rom_data_start + _data_size :

        {

        *(.initial);

        }

/*******************************************************************************************

 * board reset section:

 *

 * This section contains the short jmp from the reset section to the initial section.  It is

 * the first code executed on reset/power on.

 ******************************************************************************************/

        .reset 0x3fffff0:

        {

        *(.reset);

        }

}