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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.
*
* $Id$
*
* 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);
}
}
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