Subversion Repositories HelenOS-historic

Rev

Rev 1478 | Rev 1725 | 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"
1478 decky 31
#include "debug.inc"
913 decky 32
 
33
.text
34
 
1058 decky 35
.global halt
1075 decky 36
.global memcpy
913 decky 37
.global jump_to_kernel
38
 
1058 decky 39
halt:
40
	b halt
913 decky 41
 
1075 decky 42
memcpy:
43
	srwi. r7, r5, 3
44
	addi r6, r3, -4
45
	addi r4, r4, -4
46
	beq	2f
47
 
48
	andi. r0, r6, 3
49
	mtctr r7
50
	bne 5f
51
 
52
	1:
53
 
54
	lwz r7, 4(r4)
55
	lwzu r8, 8(r4)
56
	stw r7, 4(r6)
57
	stwu r8, 8(r6)
58
	bdnz 1b
59
 
60
	andi. r5, r5, 7
61
 
62
	2:
63
 
64
	cmplwi 0, r5, 4
65
	blt 3f
66
 
67
	lwzu r0, 4(r4)
68
	addi r5, r5, -4
69
	stwu r0, 4(r6)
70
 
71
	3:
72
 
73
	cmpwi 0, r5, 0
74
	beqlr
75
	mtctr r5
76
	addi r4, r4, 3
77
	addi r6, r6, 3
78
 
79
	4:
80
 
81
	lbzu r0, 1(r4)
82
	stbu r0, 1(r6)
83
	bdnz 4b
84
	blr
85
 
86
	5:
87
 
88
	subfic r0, r0, 4
89
	mtctr r0
90
 
91
	6:
92
 
93
	lbz r7, 4(r4)
94
	addi r4, r4, 1
95
	stb r7, 4(r6)
96
	addi r6, r6, 1
97
	bdnz 6b
98
	subf r5, r0, r5
99
	rlwinm. r7, r5, 32-3, 3, 31
100
	beq 2b
101
	mtctr r7
102
	b 1b
103
 
104
 
913 decky 105
jump_to_kernel:
1022 decky 106
 
1131 decky 107
	# r3 = bootinfo (pa)
108
	# r4 = bootinfo_size
109
	# r5 = trans (pa)
1372 decky 110
	# r6 = bytes to copy
111
	# r7 = real_mode (pa)
1478 decky 112
	# r8 = framebuffer (pa)
113
	# r9 = scanline
1022 decky 114
 
1216 decky 115
	# disable interrupts
116
 
117
	mfmsr r31
118
	rlwinm r31, r31, 0, 17, 15
119
	mtmsr r31
120
 
121
	# set real_mode meeting point address
122
 
1372 decky 123
	mtspr srr0, r7
1022 decky 124
 
125
	# jumps to real_mode
126
 
1058 decky 127
	mfmsr r31
128
	lis r30, ~0@h
1478 decky 129
	ori r30, r30, ~(msr_ir | msr_dr | msr_ee)@l
1058 decky 130
	and r31, r31, r30
131
	mtspr srr1, r31
1157 decky 132
 
133
	sync
134
	isync
1022 decky 135
	rfi
136
 
1214 decky 137
.section REALMODE, "ax"
1058 decky 138
.align PAGE_WIDTH
1022 decky 139
.global real_mode
140
 
141
real_mode:
1479 decky 142
 
143
	DEBUG_INIT
1478 decky 144
	DEBUG_real_mode
1058 decky 145
 
146
	# copy kernel to proper location
147
	#
1131 decky 148
	# r5 = trans (pa)
1372 decky 149
	# r6 = bytes to copy
1478 decky 150
	# r8 = framebuffer (pa)
151
	# r9 = scanline
1058 decky 152
 
1068 decky 153
	li r31, PAGE_SIZE >> 2
1058 decky 154
	li r30, 0
155
 
156
	page_copy:
157
 
1131 decky 158
		cmpwi r6, 0
1058 decky 159
		beq copy_end
160
 
1068 decky 161
		# copy page
1058 decky 162
 
163
		mtctr r31
1131 decky 164
		lwz r29, 0(r5)
1058 decky 165
 
1479 decky 166
		DEBUG_INIT
167
		DEBUG_copy_loop
168
 
1058 decky 169
		copy_loop:
170
 
171
			lwz r28, 0(r29)
172
			stw r28, 0(r30)
173
 
174
			addi r29, r29, 4
175
			addi r30, r30, 4
1131 decky 176
			subi r6, r6, 4
1058 decky 177
 
1131 decky 178
			cmpwi r6, 0
1068 decky 179
			beq copy_end
180
 
1058 decky 181
			bdnz copy_loop
1479 decky 182
 
183
			DEBUG_end_copy_loop
1058 decky 184
 
1131 decky 185
		addi r5, r5, 4
1058 decky 186
		b page_copy
187
 
188
	copy_end:
1068 decky 189
 
1479 decky 190
	DEBUG_segments
191
 
1214 decky 192
	# initially fill segment registers
1022 decky 193
 
1071 decky 194
	li r31, 16
195
	mtctr r31
196
	li r31, 0
1214 decky 197
	li r30, 0x2000
1071 decky 198
 
1022 decky 199
	seg_fill:
200
 
1071 decky 201
		mtsrin r30, r31
1214 decky 202
		addi r30, r30, 0x111
1071 decky 203
		addis r31, r31, 0x1000    # move to next SR
204
 
205
		bdnz seg_fill
1022 decky 206
 
1068 decky 207
	# invalidate block address translation registers
208
 
1479 decky 209
	DEBUG_bat
210
 
1373 decky 211
	li r30, 0
212
 
1068 decky 213
	mtspr ibat0u, r30
214
	mtspr ibat0l, r30
215
 
216
	mtspr ibat1u, r30
217
	mtspr ibat1l, r30
218
 
219
	mtspr ibat2u, r30
220
	mtspr ibat2l, r30
221
 
222
	mtspr ibat3u, r30
223
	mtspr ibat3l, r30
224
 
225
	mtspr dbat0u, r30
226
	mtspr dbat0l, r30
227
 
228
	mtspr dbat1u, r30
229
	mtspr dbat1l, r30
230
 
231
	mtspr dbat2u, r30
232
	mtspr dbat2l, r30
233
 
234
	mtspr dbat3u, r30
235
	mtspr dbat3l, r30
236
 
1058 decky 237
	# create identity mapping
238
 
1479 decky 239
	DEBUG_mapping
240
 
1068 decky 241
	# FIXME: map exactly the size of RAM
242
 
243
	lis r31, 0x8000
244
	ori r31, r31, 0x0ffe
245
 
246
	lis r30, 0x0000
247
	ori r30, r30, 0x0002
248
 
249
	mtspr ibat0u, r31
250
	mtspr ibat0l, r30
251
 
252
	mtspr dbat0u, r31
253
	mtspr dbat0l, r30
254
 
1479 decky 255
	DEBUG_tlb
256
 
1058 decky 257
	tlbia
1381 decky 258
	tlbsync
1058 decky 259
 
1479 decky 260
	DEBUG_prepare
261
 
1058 decky 262
	# start the kernel
1022 decky 263
	#
1131 decky 264
	# r3 = bootinfo (pa)
1022 decky 265
 
1058 decky 266
	lis r31, KERNEL_START_ADDR@ha
267
	addi r31, r31, KERNEL_START_ADDR@l
1022 decky 268
 
1058 decky 269
	mtspr srr0, r31
1022 decky 270
 
1058 decky 271
	mfmsr r31
272
	ori r31, r31, (msr_ir | msr_dr)@l
273
	mtspr srr1, r31
274
 
1146 decky 275
	sync
276
	isync
1478 decky 277
 
278
	DEBUG_rfi
1022 decky 279
	rfi
1058 decky 280
 
281
.align PAGE_WIDTH
282
.global trans
283
trans:
284
	.space (TRANS_SIZE * TRANS_ITEM_SIZE)