Subversion Repositories openrisc_2011-10-31

#ifndef CYGONCE_HAL_HALBOOT_SI /* -*-asm-*- */
#define CYGONCE_HAL_HALBOOT_SI
// ====================================================================
//
//      <platform>/halboot.si
//
//      HAL bootup platform-oriented code (assembler)
//
// ====================================================================
//####ECOSGPLCOPYRIGHTBEGIN####
// -------------------------------------------
// This file is part of eCos, the Embedded Configurable Operating System.
// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
//
// eCos is free software; you can redistribute it and/or modify it under
// the terms of the GNU General Public License as published by the Free
// Software Foundation; either version 2 or (at your option) any later version.
//
// eCos is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
// for more details.
//
// You should have received a copy of the GNU General Public License along
// with eCos; if not, write to the Free Software Foundation, Inc.,
// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
//
// As a special exception, if other files instantiate templates or use macros
// or inline functions from this file, or you compile this file and link it
// with other works to produce a work based on this file, this file does not
// by itself cause the resulting work to be covered by the GNU General Public
// License. However the source code for this file must still be made available
// in accordance with section (3) of the GNU General Public License.
//
// This exception does not invalidate any other reasons why a work based on
// this file might be covered by the GNU General Public License.
//
// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
// at http://sources.redhat.com/ecos/ecos-license/
// -------------------------------------------
//####ECOSGPLCOPYRIGHTEND####
// ====================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s):           hmt
// Contributors:        hmt
// Date:                1999-02-01
// Purpose:             Bootup code, platform oriented.
// Description:
//
//####DESCRIPTIONEND####
//
// ====================================================================

// External Platform Initial Setup
//
// This should set up RAM and caches, and calm down any external
// interrupt sources.
//
// It is just plain included in vectors.S
//
// RAM has not yet been touched at all; in fact all you have is a
// register window selected.


        ! Empty macro for debugging vectors.S
        .macro led val
        .endm

        ! Set memory according to simulator config

        set     0x80000000, %l0         ! LEON register base address

        ld      [%l0 + 0x14], %l1       ! chech if we have been initialized
        andcc   %l1, 0x1, %g0
        bne     4f
        nop

        flush                           ! if we are here, we are running on
        set     0x1000f, %l1            ! the simulator....

        st      %l1, [%l0 + 0x14]       ! enable caches

        st      %g0, [%l0 + 0x1c]       ! clear LEON registers
        st      %g0, [%l0 + 0x20]       ! 
        st      %g0, [%l0 + 0x90]       ! 
        st      %g0, [%l0 + 0x94]       ! 
        st      %g0, [%l0 + 0x98]       ! 
        st      %g0, [%l0 + 0x9C]       ! 
        st      %g0, [%l0 + 0xA0]       ! 
        st      %g0, [%l0 + 0xA4]       ! 
        st      %g0, [%l0 + 0xA4]       ! 
        st      %g0, [%l0 + 0x78]       ! 
        st      %g0, [%l0 + 0x88]       ! 

        ld      [%l0 + 0xF8], %g1       ! load simulator rom size
        clr     %l2
        subcc   %g1, 0, %g0
        be      3f
        srl     %g1, 13, %g1            ! calculate appropriate rom size
1:
        srl     %g1, 1, %g1
        tst     %g1
        bne,a   1b
        inc     %l2
        sll     %l2, 14, %l2
        st      %l2, [%l0 + 0x00]       ! set prom size in memcfg1

        set     0, %l2
        ld      [%l0 + 0xF4], %g2       ! load simulator ram size
        srl     %g2, 13, %g1            ! calculate appropriate ram size
1:
        srl     %g1, 1, %g1
        tst     %g1
        bne,a   1b
        inc     %l2
        sll     %l2, 9, %l2
        or      %l2, 0x20, %l2
        st      %l2, [%l0 + 0x04]       ! set ram size in memcfg2
        set     0x40000000, %l2
        add     %g2, %l2, %fp
        sub     %fp, 96*4, %sp
3:
        st      %g0, [%sp]              !probe for FPU
!       ld      [%sp], %fsr
        set     49, %l1
        st      %l1, [%l0 + 0x64]       ! scaler = 49
        st      %l1, [%l0 + 0x60]       ! scaler = 49

2:

        set     -1, %l1
        st      %l1, [%l0 + 0x44]       ! timer 1 = 0xffffff
        set     7, %l1
        st      %l1, [%l0 + 0x48]       ! start timer 1 
        st      %l1, [%l0 + 0x78]       ! enable UARTS
        st      %l1, [%l0 + 0x88]

4:
        ! then copy the branch instructions into the vector
        rd      %tbr, %g1
        andn    %g1, 0xfff, %g1         ! clear non-address bits
        sethi   %hi(real_vector_instructions), %l0
        or      %l0, %lo(real_vector_instructions), %l0
        ld      [ %l0 ], %l1
        st      %l1, [ %g1 ]            ! into the vector
        ld      [ %l0 + 4 ], %l1
        st      %l1, [ %g1 + 4 ]        ! into the vector

#endif  /* CYGONCE_HAL_HALBOOT_SI */
/* EOF halboot.si */