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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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	2:
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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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	3:
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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
 
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	5:
87
 
88
	subfic r0, r0, 4
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	mtctr r0
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	6:
92
 
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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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
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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
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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
1478 decky 144
	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
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	# 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:
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171
			lwz r28, 0(r29)
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			stw r28, 0(r30)
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			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
1068 decky 179
			beq copy_end
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1058 decky 181
			bdnz copy_loop
1479 decky 182
 
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			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:
1022 decky 201
 
1071 decky 202
		mtsrin r30, r31
1728 decky 203
		addi r30, r30, 1
1071 decky 204
		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
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	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
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219
		bdnz seg_fill_kernel
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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
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1068 decky 227
	mtspr ibat0u, r30
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	mtspr ibat0l, r30
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230
	mtspr ibat1u, r30
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	mtspr ibat1l, r30
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233
	mtspr ibat2u, r30
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	mtspr ibat2l, r30
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	mtspr ibat3u, r30
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	mtspr ibat3l, r30
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	mtspr dbat0u, r30
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	mtspr dbat0l, r30
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242
	mtspr dbat1u, r30
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	mtspr dbat1l, r30
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245
	mtspr dbat2u, r30
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	mtspr dbat2l, r30
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248
	mtspr dbat3u, r30
249
	mtspr dbat3l, r30
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1725 decky 251
	# create empty page hash table FIXME
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253
	DEBUG_pht
254
 
255
	lis r31, 0x07ff
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	ori r31, r31, 0x0000
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1728 decky 258
	li r30, 0x4000
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	li r29, 0
260
 
261
	pht_clear:
262
 
1737 decky 263
		# write zeroes
264
 
1728 decky 265
		stw r29, 0(r31)
266
 
267
		addi r31, r31, 4
268
		subi r30, r30, 4
269
 
270
		cmpwi r30, 0
271
		beq clear_end
272
 
273
		bdnz pht_clear
274
 
275
		DEBUG_end_pht_clear
276
 
277
	clear_end:
278
 
279
	lis r31, 0x07ff
280
	ori r31, r31, 0x0000
281
 
1725 decky 282
	mtsdr1 r31
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1728 decky 284
#ifdef CONFIG_BAT
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1737 decky 286
	# create BAT identity mapping
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1479 decky 288
	DEBUG_mapping
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1737 decky 290
	lwz r31, 0(r3)
1068 decky 291
 
1737 decky 292
	lis r29, 0x0002
293
	cmpw r31, r29
294
	blt no_bat                    # less than 128 KB -> no BAT
1068 decky 295
 
1737 decky 296
	li r29, 18
297
	srw r31, r31, r29             # r31 = total >> 18
298
 
299
	# create Block Length mask by replicating
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	# the leading logical one 14 times
301
 
302
	li r29, 14
303
	mtctr r31
304
	li r29, 1
305
 
306
	bat_mask:
307
		srw r30, r31, r29         # r30 = mask >> 1
308
		or r31, r31, r30          # mask = mask | r30
309
 
310
		bdnz bat_mask
311
 
312
	andi. r31, r31, 0x07ff        # mask = mask & 0x07ff (BAT can map up to 256 MB)
313
 
314
	li r29, 2
315
	slw r31, r31, r29             # mask = mask << 2
316
	ori r31, r31, 0x0002          # mask = mask | 0x0002 (priviledged access only)
317
 
318
	lis r29, 0x8000
319
	or r29, r29, r31
320
 
1068 decky 321
	lis r30, 0x0000
322
	ori r30, r30, 0x0002
323
 
1737 decky 324
	mtspr ibat0u, r29
1068 decky 325
	mtspr ibat0l, r30
326
 
1737 decky 327
	mtspr dbat0u, r29
1068 decky 328
	mtspr dbat0l, r30
1737 decky 329
 
330
	no_bat:
1728 decky 331
 
332
#endif
1068 decky 333
 
1479 decky 334
	DEBUG_tlb
335
 
1058 decky 336
	tlbia
1381 decky 337
	tlbsync
1058 decky 338
 
1479 decky 339
	DEBUG_prepare
340
 
1058 decky 341
	# start the kernel
1022 decky 342
	#
1728 decky 343
	# pc = KERNEL_START_ADDR
1131 decky 344
	# r3 = bootinfo (pa)
1728 decky 345
	# sprg0 = KA2PA(KERNEL_START_ADDR)
346
	# sprg3 = physical memory size
347
	# sp = 0 (pa)
1022 decky 348
 
1058 decky 349
	lis r31, KERNEL_START_ADDR@ha
350
	addi r31, r31, KERNEL_START_ADDR@l
1022 decky 351
 
1058 decky 352
	mtspr srr0, r31
1022 decky 353
 
1728 decky 354
	subis r31, r31, 0x8000
355
	mtsprg0 r31
356
 
357
	lwz r31, 0(r3)
358
	mtsprg3 r31
359
 
360
	li sp, 0
361
 
1058 decky 362
	mfmsr r31
363
	ori r31, r31, (msr_ir | msr_dr)@l
364
	mtspr srr1, r31
365
 
1146 decky 366
	sync
367
	isync
1478 decky 368
 
369
	DEBUG_rfi
1022 decky 370
	rfi
1058 decky 371
 
372
.align PAGE_WIDTH
373
.global trans
374
trans:
375
	.space (TRANS_SIZE * TRANS_ITEM_SIZE)