#
# Copyright (c) 2006 Martin Decky
# Copyright (c) 2006 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
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
/*
* start.S
*
* Start code for Sparc64 RTEMS
*
* This is based on the boot.S file of the HelenOS sparc64 architecture.
* http://www.helenos.org/
* ${helenos}/boot/arch/sparc64/loader/boot.S
*
* Modifications for the RTEMS executive are
* COPYRIGHT (c) 2010 Gedare Bloom.
* COPYRIGHT (c) 2010 Eugen Leontie.
*
* $Id$
*/
#include <rtems/asm.h>
#include <rtems/score/cpu.h>
#define PSTATE_PRIV_BIT 4
.register %g2, #scratch
.register %g3, #scratch
.register %g6, #scratch
.register %g7, #scratch
.section BOOTSTRAP, "ax"
PUBLIC(_start)
.global _start
SYM(_start):
start:
b 1f
nop
/*
* This header forces SILO to load the image at 0x4000.
* More precisely, SILO will think this is an old version of Linux.
*/
.ascii "HdrS"
.word 0
.half 0
.half 0
.half 0
.half 0
.global silo_ramdisk_image
silo_ramdisk_image:
.word 0
.global silo_ramdisk_size
silo_ramdisk_size:
.word 0
.align 8
1:
/*
* Disable interrupts and disable address masking.
*/
wrpr %g0, PSTATE_PRIV_BIT, %pstate
wrpr %g0, SPARC_NUMBER_OF_REGISTER_WINDOWS - 2, %cansave ! set maximum saveable windows
wrpr %g0, 0, %canrestore ! get rid of windows we will never need again
wrpr %g0, 0, %otherwin ! make sure the window state is consistent
wrpr %g0, SPARC_NUMBER_OF_REGISTER_WINDOWS - 1, %cleanwin ! prevent needless clean_window traps for kernel
/* g4 needs to be cleared for gcc */
mov %g0, %g4
/* Clear the bss */
setx SYM(bss_start), %l0, %g2 ! g2 = start of bss
setx SYM(_end), %l0, %g3 ! g3 = end of bss
zerobss:
stx %g0, [%g2]
add %g2, 8, %g2
cmp %g2, %g3
bleu,a zerobss
nop
/* Install stack */
setstack:
set SYM(StackStart), %sp
add %sp, -STACK_BIAS, %sp
/* BSP-specific pre-bootcard initializations */
call SYM(_BSP_init)
nop
setx ofw_cif, %l0, %l1
call ofw_init ! initialize OpenFirmware
stx %o4, [%l1]
call bootstrap
nop
/* Set up ISR handler for interrupt enable/disable */
setx SYM(syscall), %l0, %o1
setx param_space, %l0, %o2
call SYM(_CPU_ISR_install_raw_handler)
mov 0x100, %o0
/* Don't need to copy initialized data to RAM--link puts all in RAM already */
mov %g0, %o0 ! clear command line passed to main
call SYM(boot_card)
sub %sp, 0x60, %sp ! make room on stack (necessary?)
call SYM(halt)
nop
halted: nop
b SYM(halted)
.section BOOTSTRAP
.align CPU_ALIGNMENT
.space 32768 - CPU_MINIMUM_STACK_FRAME_SIZE ! 32K boot stack grows down
.global StackStart
StackStart:
.space CPU_MINIMUM_STACK_FRAME_SIZE ! initial stack frame
.section BOOTSTRAP
.align CPU_ALIGNMENT
param_space:
.space 8
.section .fini
.global _fini
_fini:
nop
retl
nop
.section .init
.global _init
_init:
nop
retl
nop
