1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
|
#
# 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
|
