Subversion Repositories HelenOS-historic

Rev

Rev 1214 | Rev 1372 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
913 decky 1
#
2
# Copyright (C) 2006 Martin Decky
3
# All rights reserved.
4
#
5
# Redistribution and use in source and binary forms, with or without
6
# modification, are permitted provided that the following conditions
7
# are met:
8
#
9
# - Redistributions of source code must retain the above copyright
10
#   notice, this list of conditions and the following disclaimer.
11
# - Redistributions in binary form must reproduce the above copyright
12
#   notice, this list of conditions and the following disclaimer in the
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
15
#   derived from this software without specific prior written permission.
16
#
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
19
# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20
# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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
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
26
# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
#
28
 
1058 decky 29
#include "asm.h"
913 decky 30
#include "regname.h"
31
 
32
.text
33
 
1058 decky 34
.global halt
1075 decky 35
.global memcpy
913 decky 36
.global jump_to_kernel
37
 
1058 decky 38
halt:
39
	b halt
913 decky 40
 
1075 decky 41
memcpy:
42
	srwi. r7, r5, 3
43
	addi r6, r3, -4
44
	addi r4, r4, -4
45
	beq	2f
46
 
47
	andi. r0, r6, 3
48
	mtctr r7
49
	bne 5f
50
 
51
	1:
52
 
53
	lwz r7, 4(r4)
54
	lwzu r8, 8(r4)
55
	stw r7, 4(r6)
56
	stwu r8, 8(r6)
57
	bdnz 1b
58
 
59
	andi. r5, r5, 7
60
 
61
	2:
62
 
63
	cmplwi 0, r5, 4
64
	blt 3f
65
 
66
	lwzu r0, 4(r4)
67
	addi r5, r5, -4
68
	stwu r0, 4(r6)
69
 
70
	3:
71
 
72
	cmpwi 0, r5, 0
73
	beqlr
74
	mtctr r5
75
	addi r4, r4, 3
76
	addi r6, r6, 3
77
 
78
	4:
79
 
80
	lbzu r0, 1(r4)
81
	stbu r0, 1(r6)
82
	bdnz 4b
83
	blr
84
 
85
	5:
86
 
87
	subfic r0, r0, 4
88
	mtctr r0
89
 
90
	6:
91
 
92
	lbz r7, 4(r4)
93
	addi r4, r4, 1
94
	stb r7, 4(r6)
95
	addi r6, r6, 1
96
	bdnz 6b
97
	subf r5, r0, r5
98
	rlwinm. r7, r5, 32-3, 3, 31
99
	beq 2b
100
	mtctr r7
101
	b 1b
102
 
103
 
913 decky 104
jump_to_kernel:
1022 decky 105
 
1131 decky 106
	# r3 = bootinfo (pa)
107
	# r4 = bootinfo_size
108
	# r5 = trans (pa)
109
	# r6 = kernel size
1146 decky 110
	# r7 = framebuffer (pa)
111
	# r8 = real_mode (pa)
1022 decky 112
 
1216 decky 113
	# disable interrupts
114
 
115
	mfmsr r31
116
	rlwinm r31, r31, 0, 17, 15
117
	mtmsr r31
118
 
119
	# set real_mode meeting point address
120
 
1146 decky 121
	mtspr srr0, r8
1022 decky 122
 
123
	# jumps to real_mode
124
 
1058 decky 125
	mfmsr r31
126
	lis r30, ~0@h
127
	ori r30, r30, ~(msr_ir | msr_dr)@l
128
	and r31, r31, r30
129
	mtspr srr1, r31
1157 decky 130
 
131
	sync
132
	isync
1022 decky 133
	rfi
134
 
1214 decky 135
.section REALMODE, "ax"
1058 decky 136
.align PAGE_WIDTH
1022 decky 137
.global real_mode
138
 
139
real_mode:
1058 decky 140
 
141
	# copy kernel to proper location
142
	#
1131 decky 143
	# r5 = trans (pa)
144
	# r6 = kernel size
1146 decky 145
	# r7 = framebuffer (pa)
1058 decky 146
 
1068 decky 147
	li r31, PAGE_SIZE >> 2
1058 decky 148
	li r30, 0
149
 
150
	page_copy:
151
 
1131 decky 152
		cmpwi r6, 0
1058 decky 153
		beq copy_end
154
 
1068 decky 155
		# copy page
1058 decky 156
 
157
		mtctr r31
1131 decky 158
		lwz r29, 0(r5)
1058 decky 159
 
160
		copy_loop:
161
 
162
			lwz r28, 0(r29)
163
			stw r28, 0(r30)
164
 
165
			addi r29, r29, 4
166
			addi r30, r30, 4
1131 decky 167
			subi r6, r6, 4
1058 decky 168
 
1131 decky 169
			cmpwi r6, 0
1068 decky 170
			beq copy_end
171
 
1058 decky 172
			bdnz copy_loop
173
 
1131 decky 174
		addi r5, r5, 4
1058 decky 175
		b page_copy
176
 
177
	copy_end:
1068 decky 178
 
1214 decky 179
	# initially fill segment registers
1022 decky 180
 
1071 decky 181
	li r31, 16
182
	mtctr r31
183
	li r31, 0
1214 decky 184
	li r30, 0x2000
1071 decky 185
 
1022 decky 186
	seg_fill:
187
 
1071 decky 188
		mtsrin r30, r31
1214 decky 189
		addi r30, r30, 0x111
1071 decky 190
		addis r31, r31, 0x1000    # move to next SR
191
 
192
		bdnz seg_fill
1022 decky 193
 
1068 decky 194
	# invalidate block address translation registers
195
 
196
	mtspr ibat0u, r30
197
	mtspr ibat0l, r30
198
 
199
	mtspr ibat1u, r30
200
	mtspr ibat1l, r30
201
 
202
	mtspr ibat2u, r30
203
	mtspr ibat2l, r30
204
 
205
	mtspr ibat3u, r30
206
	mtspr ibat3l, r30
207
 
208
	mtspr dbat0u, r30
209
	mtspr dbat0l, r30
210
 
211
	mtspr dbat1u, r30
212
	mtspr dbat1l, r30
213
 
214
	mtspr dbat2u, r30
215
	mtspr dbat2l, r30
216
 
217
	mtspr dbat3u, r30
218
	mtspr dbat3l, r30
219
 
1058 decky 220
	# create identity mapping
221
 
1068 decky 222
	# FIXME: map exactly the size of RAM
223
 
224
	lis r31, 0x8000
225
	ori r31, r31, 0x0ffe
226
 
227
	lis r30, 0x0000
228
	ori r30, r30, 0x0002
229
 
230
	mtspr ibat0u, r31
231
	mtspr ibat0l, r30
232
 
233
	mtspr dbat0u, r31
234
	mtspr dbat0l, r30
235
 
236
	# FIXME: temporal framebuffer mapping
237
 
238
	lis r31, 0xf000
239
	ori r31, r31, 0x0ffe
240
 
1146 decky 241
	mr r30, r7
1068 decky 242
	ori r30, r30, 0x0002
243
 
244
	mtspr dbat1u, r31
245
	mtspr dbat1l, r30
246
 
1058 decky 247
	tlbia
248
 
249
	# start the kernel
1022 decky 250
	#
1131 decky 251
	# r3 = bootinfo (pa)
1022 decky 252
 
1058 decky 253
	lis r31, KERNEL_START_ADDR@ha
254
	addi r31, r31, KERNEL_START_ADDR@l
1022 decky 255
 
1058 decky 256
	mtspr srr0, r31
1022 decky 257
 
1058 decky 258
	mfmsr r31
259
	ori r31, r31, (msr_ir | msr_dr)@l
260
	mtspr srr1, r31
261
 
1146 decky 262
	sync
263
	isync
1022 decky 264
	rfi
1058 decky 265
 
266
.align PAGE_WIDTH
267
.global trans
268
trans:
269
	.space (TRANS_SIZE * TRANS_ITEM_SIZE)