source: mainline/arch/ia64/src/start.S@ d9f81af3

#
# Copyright (C) 2005 Jakub Jermar
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# - Redistributions of source code must retain the above copyright
#   notice, this list of conditions and the following disclaimer.
# - Redistributions in binary form must reproduce the above copyright
#   notice, this list of conditions and the following disclaimer in the
#   documentation and/or other materials provided with the distribution.
# - The name of the author may not be used to endorse or promote products
#   derived from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#

.section K_TEXT_START

.global kernel_image_start

stack0:
kernel_image_start:
        .auto
        # initialize PSR
        mov psr.l = r0
        
        # initialize register stack
        mov ar.rsc = r0
        mov ar.bspstore = r0
        loadrs

        .explicit
        # initialize memory stack to some sane value
        movl r12 = stack0       ;;
        add r12 = - 16, r12     /* allocate a scratch area on the stack */

        # initialize gp (Global Pointer) register
        movl r1 = _hardcoded_load_address
        
        ;;

        #
        # Initialize hardcoded_* variables.
        #
        movl r14 = _hardcoded_ktext_size
        movl r15 = _hardcoded_kdata_size
        movl r16 = _hardcoded_load_address
        addl r17 = @gprel(hardcoded_ktext_size), gp
        addl r18 = @gprel(hardcoded_kdata_size), gp
        addl r19 = @gprel(hardcoded_load_address), gp
        ;;
        st4 [r17] = r14
        st4 [r18] = r15
        st8 [r19] = r16
        
        br.call.sptk.many b0=main_bsp

0:
        br 0b