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913 decky 1
#
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# Copyright (C) 2006 Martin Decky
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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#
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# - Redistributions of source code must retain the above copyright
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#   notice, this list of conditions and the following disclaimer.
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# - Redistributions in binary form must reproduce the above copyright
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#   notice, this list of conditions and the following disclaimer in the
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#   documentation and/or other materials provided with the distribution.
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# - The name of the author may not be used to endorse or promote products
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#   derived from this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#
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1058 decky 29
#include "asm.h"
913 decky 30
#include "regname.h"
1478 decky 31
#include "debug.inc"
913 decky 32
 
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.text
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1058 decky 35
.global halt
1075 decky 36
.global memcpy
913 decky 37
.global jump_to_kernel
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1058 decky 39
halt:
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	b halt
913 decky 41
 
1075 decky 42
memcpy:
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	srwi. r7, r5, 3
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	addi r6, r3, -4
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	addi r4, r4, -4
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	beq	2f
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	andi. r0, r6, 3
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	mtctr r7
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	bne 5f
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	1:
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	lwz r7, 4(r4)
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	lwzu r8, 8(r4)
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	stw r7, 4(r6)
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	stwu r8, 8(r6)
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	bdnz 1b
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60
	andi. r5, r5, 7
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62
	2:
63
 
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	cmplwi 0, r5, 4
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	blt 3f
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	lwzu r0, 4(r4)
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	addi r5, r5, -4
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	stwu r0, 4(r6)
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71
	3:
72
 
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	cmpwi 0, r5, 0
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	beqlr
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	mtctr r5
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	addi r4, r4, 3
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	addi r6, r6, 3
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	4:
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	lbzu r0, 1(r4)
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	stbu r0, 1(r6)
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	bdnz 4b
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	blr
85
 
86
	5:
87
 
88
	subfic r0, r0, 4
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	mtctr r0
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91
	6:
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93
	lbz r7, 4(r4)
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	addi r4, r4, 1
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	stb r7, 4(r6)
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	addi r6, r6, 1
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	bdnz 6b
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	subf r5, r0, r5
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	rlwinm. r7, r5, 32-3, 3, 31
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	beq 2b
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	mtctr r7
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	b 1b
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104
 
913 decky 105
jump_to_kernel:
1022 decky 106
 
1131 decky 107
	# r3 = bootinfo (pa)
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	# r4 = bootinfo_size
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	# r5 = trans (pa)
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	# r6 = bytes to copy
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	# r7 = real_mode (pa)
1478 decky 112
	# r8 = framebuffer (pa)
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	# r9 = scanline
1022 decky 114
 
1216 decky 115
	# disable interrupts
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117
	mfmsr r31
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	rlwinm r31, r31, 0, 17, 15
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	mtmsr r31
120
 
121
	# set real_mode meeting point address
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1372 decky 123
	mtspr srr0, r7
1022 decky 124
 
125
	# jumps to real_mode
126
 
1058 decky 127
	mfmsr r31
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	lis r30, ~0@h
1478 decky 129
	ori r30, r30, ~(msr_ir | msr_dr | msr_ee)@l
1058 decky 130
	and r31, r31, r30
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	mtspr srr1, r31
1157 decky 132
 
133
	sync
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	isync
1022 decky 135
	rfi
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1214 decky 137
.section REALMODE, "ax"
1058 decky 138
.align PAGE_WIDTH
1022 decky 139
.global real_mode
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141
real_mode:
1479 decky 142
 
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	DEBUG_INIT
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	DEBUG_real_mode
1058 decky 145
 
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	# copy kernel to proper location
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	#
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	# r5 = trans (pa)
1372 decky 149
	# r6 = bytes to copy
1478 decky 150
	# r8 = framebuffer (pa)
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	# r9 = scanline
1058 decky 152
 
1068 decky 153
	li r31, PAGE_SIZE >> 2
1058 decky 154
	li r30, 0
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	page_copy:
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1131 decky 158
		cmpwi r6, 0
1058 decky 159
		beq copy_end
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1068 decky 161
		# copy page
1058 decky 162
 
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		mtctr r31
1131 decky 164
		lwz r29, 0(r5)
1058 decky 165
 
1479 decky 166
		DEBUG_INIT
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		DEBUG_copy_loop
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1058 decky 169
		copy_loop:
170
 
171
			lwz r28, 0(r29)
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			stw r28, 0(r30)
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174
			addi r29, r29, 4
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			addi r30, r30, 4
1131 decky 176
			subi r6, r6, 4
1058 decky 177
 
1131 decky 178
			cmpwi r6, 0
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			beq copy_end
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1058 decky 181
			bdnz copy_loop
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183
			DEBUG_end_copy_loop
1058 decky 184
 
1131 decky 185
		addi r5, r5, 4
1058 decky 186
		b page_copy
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188
	copy_end:
1068 decky 189
 
1479 decky 190
	DEBUG_segments
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1214 decky 192
	# initially fill segment registers
1728 decky 193
 
1071 decky 194
	li r31, 0
1728 decky 195
 
196
	li r29, 8
197
	mtctr r29
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	li r30, 0                     # ASID 0 (VSIDs 0 .. 7)
1071 decky 199
 
1728 decky 200
	seg_fill_uspace:
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1071 decky 202
		mtsrin r30, r31
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		addi r30, r30, 1
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		addis r31, r31, 0x1000    # move to next SR
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1728 decky 206
		bdnz seg_fill_uspace
1022 decky 207
 
1728 decky 208
	li r29, 8
209
	mtctr r29
1737 decky 210
	lis r30, 0x4000               # priviledged access only
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	ori r30, r30, 8               # ASID 0 (VSIDs 8 .. 15)
1728 decky 212
 
213
	seg_fill_kernel:
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215
		mtsrin r30, r31
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		addi r30, r30, 1
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		addis r31, r31, 0x1000    # move to next SR
218
 
219
		bdnz seg_fill_kernel
220
 
1068 decky 221
	# invalidate block address translation registers
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1479 decky 223
	DEBUG_bat
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1373 decky 225
	li r30, 0
226
 
1068 decky 227
	mtspr ibat0u, r30
228
	mtspr ibat0l, r30
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230
	mtspr ibat1u, r30
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	mtspr ibat1l, r30
232
 
233
	mtspr ibat2u, r30
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	mtspr ibat2l, r30
235
 
236
	mtspr ibat3u, r30
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	mtspr ibat3l, r30
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	mtspr dbat0u, r30
240
	mtspr dbat0l, r30
241
 
242
	mtspr dbat1u, r30
243
	mtspr dbat1l, r30
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245
	mtspr dbat2u, r30
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	mtspr dbat2l, r30
247
 
248
	mtspr dbat3u, r30
249
	mtspr dbat3l, r30
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	# create empty Page Hash Table
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	# on top of memory, size 64 KB
1725 decky 253
 
254
	DEBUG_pht
255
 
1738 decky 256
	lwz r31, 0(r3)                # r31 = memory size
1725 decky 257
 
1738 decky 258
	lis r30, 65536@h
259
	ori r30, r30, 65536@l         # r30 = 65536
260
 
261
	subi r29, r30, 1              # r29 = 65535
262
 
263
	sub r31, r31, r30
264
	andc r31, r31, r29            # pht = ALIGN_DOWN(memory_size - 65536, 65536)
265
 
266
	mtsdr1 r31
267
 
268
	li r29, 2
269
	srw r30, r30, r29             # r30 = 16384
1728 decky 270
	li r29, 0
271
 
272
	pht_clear:
273
 
1737 decky 274
		# write zeroes
275
 
1728 decky 276
		stw r29, 0(r31)
277
 
278
		addi r31, r31, 4
279
		subi r30, r30, 4
280
 
281
		cmpwi r30, 0
282
		beq clear_end
283
 
284
		bdnz pht_clear
285
 
286
		DEBUG_end_pht_clear
287
 
288
	clear_end:
289
 
290
#ifdef CONFIG_BAT
291
 
1737 decky 292
	# create BAT identity mapping
293
 
1479 decky 294
	DEBUG_mapping
295
 
1738 decky 296
	lwz r31, 0(r3)                # r31 = memory size
1068 decky 297
 
1737 decky 298
	lis r29, 0x0002
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	cmpw r31, r29
300
	blt no_bat                    # less than 128 KB -> no BAT
1068 decky 301
 
1737 decky 302
	li r29, 18
303
	srw r31, r31, r29             # r31 = total >> 18
304
 
305
	# create Block Length mask by replicating
306
	# the leading logical one 14 times
307
 
308
	li r29, 14
309
	mtctr r31
310
	li r29, 1
311
 
312
	bat_mask:
313
		srw r30, r31, r29         # r30 = mask >> 1
314
		or r31, r31, r30          # mask = mask | r30
315
 
316
		bdnz bat_mask
317
 
318
	andi. r31, r31, 0x07ff        # mask = mask & 0x07ff (BAT can map up to 256 MB)
319
 
320
	li r29, 2
321
	slw r31, r31, r29             # mask = mask << 2
322
	ori r31, r31, 0x0002          # mask = mask | 0x0002 (priviledged access only)
323
 
324
	lis r29, 0x8000
325
	or r29, r29, r31
326
 
1068 decky 327
	lis r30, 0x0000
328
	ori r30, r30, 0x0002
329
 
1737 decky 330
	mtspr ibat0u, r29
1068 decky 331
	mtspr ibat0l, r30
332
 
1737 decky 333
	mtspr dbat0u, r29
1068 decky 334
	mtspr dbat0l, r30
1737 decky 335
 
336
	no_bat:
1728 decky 337
 
338
#endif
1068 decky 339
 
1479 decky 340
	DEBUG_tlb
341
 
1058 decky 342
	tlbia
1381 decky 343
	tlbsync
1058 decky 344
 
1479 decky 345
	DEBUG_prepare
346
 
1058 decky 347
	# start the kernel
1022 decky 348
	#
1728 decky 349
	# pc = KERNEL_START_ADDR
1131 decky 350
	# r3 = bootinfo (pa)
1728 decky 351
	# sprg0 = KA2PA(KERNEL_START_ADDR)
352
	# sprg3 = physical memory size
353
	# sp = 0 (pa)
1022 decky 354
 
1058 decky 355
	lis r31, KERNEL_START_ADDR@ha
356
	addi r31, r31, KERNEL_START_ADDR@l
1022 decky 357
 
1058 decky 358
	mtspr srr0, r31
1022 decky 359
 
1728 decky 360
	subis r31, r31, 0x8000
361
	mtsprg0 r31
362
 
363
	lwz r31, 0(r3)
364
	mtsprg3 r31
365
 
366
	li sp, 0
367
 
1058 decky 368
	mfmsr r31
369
	ori r31, r31, (msr_ir | msr_dr)@l
370
	mtspr srr1, r31
371
 
1146 decky 372
	sync
373
	isync
1478 decky 374
 
375
	DEBUG_rfi
1022 decky 376
	rfi
1058 decky 377
 
378
.align PAGE_WIDTH
379
.global trans
380
trans:
381
	.space (TRANS_SIZE * TRANS_ITEM_SIZE)