WebSVN – HelenOS-historic – Diff – /kernel/trunk/arch/sparc64/src/start.S


#
# 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
# 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.
#
 
#include <arch/boot/boot.h>
 
.register %g2, #scratch
.register %g3, #scratch
.register %g6, #scratch
.register %g7, #scratch
 
.section K_TEXT_START, "ax"
 
/*
 * Here is where the kernel is passed control.
 * The code must be position independent until
 * the kernel relocates itself to its VMA.
 */
 
.global kernel_image_start
kernel_image_start:
0:
	b 1f
	nop
 
/*
 * This header forces SILO to load the kernel at 0x4000.
 * More precisely, SILO will think this is an old version of Linux.
 */
.ascii "HdrS"
.word 0
.half 0
 
.align 8
 
1:
	flushw				! flush all but the active register window
 
	/*
	 * Prepare to copy the kernel image to 4M.
	 */
 
	set LMA, %g1			! source address
	set VMA, %g2			! destination address
	set hardcoded_ktext_size, %g3	! link address of hardcoded_ktext_size
	set hardcoded_kdata_size, %g4	! link address of hardcoded_kdata_size
 
	sub %g3, %g2, %g3		! offset of hardcoded_ktext_size from the beginning of the load address
	sub %g4, %g2, %g4		! offset of hardcoded_kdata_size from the beginning of the load address
	
	ldx [%g3 + %g1], %g3		! hardcoded_ktext_size -> %g3
	ldx [%g4 + %g1], %g4		! hardcoded_kdata_size -> %g4
 
	add %g3, %g4, %g3		! size of kernel text and data
 
	/*
	 * Start copying the kernel from higher addresses towards lower addresses.
	 */
 
2:	dec %g3
	ldub [%g1 + %g3], %g4
	stb %g4, [%g2 + %g3]
	cmp %g3, 0
	bnz 2b
	nop
 
	set relocated, %g1
	jmp %g1
	nop
 
relocated:
	set ofw, %l0
 
	call ofw_init
	stx %o4, [%l0]
 
	call main_bsp
	nop
 
	/* Not reached. */
 
2:
	b 2b
	nop
 

Rev 846	Rev 847
1	#	1	#
2	# Copyright (C) 2005 Jakub Jermar	2	# Copyright (C) 2005 Jakub Jermar
3	# All rights reserved.	3	# All rights reserved.
4	#	4	#
5	# Redistribution and use in source and binary forms, with or without	5	# Redistribution and use in source and binary forms, with or without
6	# modification, are permitted provided that the following conditions	6	# modification, are permitted provided that the following conditions
7	# are met:	7	# are met:
8	#	8	#
9	# - Redistributions of source code must retain the above copyright	9	# - Redistributions of source code must retain the above copyright
10	# notice, this list of conditions and the following disclaimer.	10	# notice, this list of conditions and the following disclaimer.
11	# - Redistributions in binary form must reproduce the above copyright	11	# - Redistributions in binary form must reproduce the above copyright
12	# notice, this list of conditions and the following disclaimer in the	12	# notice, this list of conditions and the following disclaimer in the
13	# documentation and/or other materials provided with the distribution.	13	# documentation and/or other materials provided with the distribution.
14	# - The name of the author may not be used to endorse or promote products	14	# - The name of the author may not be used to endorse or promote products
15	# derived from this software without specific prior written permission.	15	# derived from this software without specific prior written permission.
16	#	16	#
17	# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR	17	# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18	# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES	18	# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19	# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.	19	# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20	# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,	20	# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21	# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT	21	# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22	# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,	22	# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23	# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY	23	# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24	# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT	24	# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25	# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF	25	# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26	# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.	26	# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27	#	27	#
28		28
29	#include <arch/boot/boot.h>	29	#include <arch/boot/boot.h>
30		30
31	.register %g2, #scratch	31	.register %g2, #scratch
32	.register %g3, #scratch	32	.register %g3, #scratch
33	.register %g6, #scratch	33	.register %g6, #scratch
34	.register %g7, #scratch	34	.register %g7, #scratch
35		35
36	.section K_TEXT_START, "ax"	36	.section K_TEXT_START, "ax"
37		37
-		38	/*
-		39	* Here is where the kernel is passed control.
-		40	* The code must be position independent until
-		41	* the kernel relocates itself to its VMA.
-		42	*/
-		43
38	.global kernel_image_start	44	.global kernel_image_start
39	kernel_image_start:	45	kernel_image_start:
40	0:	46	0:
41	b 1f	47	b 1f
42	nop	48	nop
43		49
44	#	50	/*
45	# This header forces SILO to load the kernel at 0x4000.	51	* This header forces SILO to load the kernel at 0x4000.
46	# More precisely, SILO will think this is an old version of Linux.	52	* More precisely, SILO will think this is an old version of Linux.
47	#	53	*/
48	.ascii "HdrS"	54	.ascii "HdrS"
49	.word 0	55	.word 0
50	.half 0	56	.half 0
51		57
52	.align 8	58	.align 8
53		59
54	1:	60	1:
55	flushw ! flush all but the active register window	61	flushw ! flush all but the active register window
56		62
57	/*	63	/*
58	* Prepare to copy the kernel image to 4M.	64	* Prepare to copy the kernel image to 4M.
59	*/	65	*/
60		66
61	set LMA, %g1 ! source address	67	set LMA, %g1 ! source address
62	set VMA, %g2 ! destination address (VMA)	68	set VMA, %g2 ! destination address
63	set hardcoded_ktext_size, %g3 ! link address of hardcoded_ktext_size	69	set hardcoded_ktext_size, %g3 ! link address of hardcoded_ktext_size
64	set hardcoded_kdata_size, %g4 ! link address of hardcoded_kdata_size	70	set hardcoded_kdata_size, %g4 ! link address of hardcoded_kdata_size
65		71
66	sub %g3, %g2, %g3 ! offset of hardcoded_ktext_size from the beginning of the load address	72	sub %g3, %g2, %g3 ! offset of hardcoded_ktext_size from the beginning of the load address
67	sub %g4, %g2, %g4 ! offset of hardcoded_kdata_size from the beginning of the load address	73	sub %g4, %g2, %g4 ! offset of hardcoded_kdata_size from the beginning of the load address
68		74
69	ldx [%g3 + %g1], %g3 ! hardcoded_ktext_size -> %g3	75	ldx [%g3 + %g1], %g3 ! hardcoded_ktext_size -> %g3
70	ldx [%g4 + %g1], %g4 ! hardcoded_kdata_size -> %g4	76	ldx [%g4 + %g1], %g4 ! hardcoded_kdata_size -> %g4
71		77
72	add %g3, %g4, %g3 ! size of kernel text and data	78	add %g3, %g4, %g3 ! size of kernel text and data
73		79
74	/*	80	/*
75	* Start copying the kernel from higher addresses towards lower addresses.	81	* Start copying the kernel from higher addresses towards lower addresses.
76	*/	82	*/
77		83
78	2: dec %g3	84	2: dec %g3
79	ldub [%g1 + %g3], %g4	85	ldub [%g1 + %g3], %g4
80	stb %g4, [%g2 + %g3]	86	stb %g4, [%g2 + %g3]
81	cmp %g3, 0	87	cmp %g3, 0
82	bnz 2b	88	bnz 2b
83	nop	89	nop
84		90
85	set relocated, %g1	91	set relocated, %g1
86	jmp %g1	92	jmp %g1
87	nop	93	nop
88		94
89	relocated:	95	relocated:
90	set ofw, %l0	96	set ofw, %l0
91		97
92	call ofw_init	98	call ofw_init
93	stx %o4, [%l0]	99	stx %o4, [%l0]
94		100
95	call main_bsp	101	call main_bsp
96	nop	102	nop
97		103
98	/* Not reached. */	104	/* Not reached. */
99		105
100	2:	106	2:
101	b 2b	107	b 2b
102	nop	108	nop
103		109

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(root)/kernel/trunk/arch/sparc64/src/start.S – Rev 846 → 847