WebSVN – HelenOS – Blame – /branches/snapshot/boot/arch/ppc32/loader/asm.S

Rev	Author	Line No.	Line
913	decky	1	#
2071	jermar	2	# Copyright (c) 2006 Martin Decky
913	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
3856	decky	32	.macro SMC_COHERENCY addr
3855	decky	33	dcbst 0, \addr
		34	sync
		35	icbi 0, \addr
3856	decky	36	sync
3855	decky	37	isync
		38	.endm
		39
3856	decky	40	.macro FLUSH_DCACHE addr
		41	dcbst 0, \addr
		42	sync
		43	isync
		44	.endm
		45
		46	.macro TLB_FLUSH reg
		47	tlbie \reg
		48	addi \reg, \reg, 0x1000
		49	.endm
		50
913	decky	51	.text
		52
1058	decky	53	.global halt
1075	decky	54	.global memcpy
913	decky	55	.global jump_to_kernel
		56
1058	decky	57	halt:
		58	b halt
913	decky	59
1075	decky	60	memcpy:
		61	srwi. r7, r5, 3
		62	addi r6, r3, -4
		63	addi r4, r4, -4
		64	beq 2f
		65
		66	andi. r0, r6, 3
		67	mtctr r7
		68	bne 5f
		69
		70	1:
		71
		72	lwz r7, 4(r4)
		73	lwzu r8, 8(r4)
		74	stw r7, 4(r6)
		75	stwu r8, 8(r6)
		76	bdnz 1b
		77
		78	andi. r5, r5, 7
		79
		80	2:
		81
		82	cmplwi 0, r5, 4
		83	blt 3f
		84
		85	lwzu r0, 4(r4)
		86	addi r5, r5, -4
		87	stwu r0, 4(r6)
		88
		89	3:
		90
		91	cmpwi 0, r5, 0
		92	beqlr
		93	mtctr r5
		94	addi r4, r4, 3
		95	addi r6, r6, 3
		96
		97	4:
		98
		99	lbzu r0, 1(r4)
		100	stbu r0, 1(r6)
		101	bdnz 4b
		102	blr
		103
		104	5:
		105
		106	subfic r0, r0, 4
		107	mtctr r0
		108
		109	6:
		110
		111	lbz r7, 4(r4)
		112	addi r4, r4, 1
		113	stb r7, 4(r6)
		114	addi r6, r6, 1
		115	bdnz 6b
		116	subf r5, r0, r5
		117	rlwinm. r7, r5, 32-3, 3, 31
		118	beq 2b
		119	mtctr r7
		120	b 1b
		121
		122
913	decky	123	jump_to_kernel:
1022	decky	124
1131	decky	125	# r3 = bootinfo (pa)
		126	# r4 = bootinfo_size
		127	# r5 = trans (pa)
1372	decky	128	# r6 = bytes to copy
		129	# r7 = real_mode (pa)
1478	decky	130	# r8 = framebuffer (pa)
		131	# r9 = scanline
1022	decky	132
1216	decky	133	# disable interrupts
		134
		135	mfmsr r31
		136	rlwinm r31, r31, 0, 17, 15
		137	mtmsr r31
		138
		139	# set real_mode meeting point address
		140
1372	decky	141	mtspr srr0, r7
1022	decky	142
		143	# jumps to real_mode
		144
1058	decky	145	mfmsr r31
		146	lis r30, ~0@h
1478	decky	147	ori r30, r30, ~(msr_ir \| msr_dr \| msr_ee)@l
1058	decky	148	and r31, r31, r30
		149	mtspr srr1, r31
1157	decky	150
		151	sync
		152	isync
1022	decky	153	rfi
		154
1214	decky	155	.section REALMODE, "ax"
1058	decky	156	.align PAGE_WIDTH
1022	decky	157	.global real_mode
		158
		159	real_mode:
1479	decky	160
1058	decky	161	# copy kernel to proper location
		162	#
1131	decky	163	# r5 = trans (pa)
1372	decky	164	# r6 = bytes to copy
1478	decky	165	# r8 = framebuffer (pa)
		166	# r9 = scanline
1058	decky	167
1068	decky	168	li r31, PAGE_SIZE >> 2
1058	decky	169	li r30, 0
		170
		171	page_copy:
		172
1131	decky	173	cmpwi r6, 0
1058	decky	174	beq copy_end
		175
1068	decky	176	# copy page
1058	decky	177
		178	mtctr r31
1131	decky	179	lwz r29, 0(r5)
1058	decky	180
		181	copy_loop:
		182
		183	lwz r28, 0(r29)
		184	stw r28, 0(r30)
		185
3856	decky	186	SMC_COHERENCY r30
3855	decky	187
1058	decky	188	addi r29, r29, 4
		189	addi r30, r30, 4
1131	decky	190	subi r6, r6, 4
1058	decky	191
1131	decky	192	cmpwi r6, 0
1068	decky	193	beq copy_end
		194
1058	decky	195	bdnz copy_loop
1479	decky	196
1131	decky	197	addi r5, r5, 4
1058	decky	198	b page_copy
		199
		200	copy_end:
1068	decky	201
1214	decky	202	# initially fill segment registers
1728	decky	203
1071	decky	204	li r31, 0
1728	decky	205
		206	li r29, 8
		207	mtctr r29
1737	decky	208	li r30, 0 # ASID 0 (VSIDs 0 .. 7)
3855	decky	209
1728	decky	210	seg_fill_uspace:
1022	decky	211
1071	decky	212	mtsrin r30, r31
1728	decky	213	addi r30, r30, 1
1071	decky	214	addis r31, r31, 0x1000 # move to next SR
		215
1728	decky	216	bdnz seg_fill_uspace
1022	decky	217
1728	decky	218	li r29, 8
		219	mtctr r29
1737	decky	220	lis r30, 0x4000 # priviledged access only
		221	ori r30, r30, 8 # ASID 0 (VSIDs 8 .. 15)
1728	decky	222
		223	seg_fill_kernel:
		224
		225	mtsrin r30, r31
		226	addi r30, r30, 1
		227	addis r31, r31, 0x1000 # move to next SR
		228
		229	bdnz seg_fill_kernel
		230
1068	decky	231	# invalidate block address translation registers
		232
1373	decky	233	li r30, 0
		234
1068	decky	235	mtspr ibat0u, r30
		236	mtspr ibat0l, r30
		237
		238	mtspr ibat1u, r30
		239	mtspr ibat1l, r30
		240
		241	mtspr ibat2u, r30
		242	mtspr ibat2l, r30
		243
		244	mtspr ibat3u, r30
		245	mtspr ibat3l, r30
		246
		247	mtspr dbat0u, r30
		248	mtspr dbat0l, r30
		249
		250	mtspr dbat1u, r30
		251	mtspr dbat1l, r30
		252
		253	mtspr dbat2u, r30
		254	mtspr dbat2l, r30
		255
		256	mtspr dbat3u, r30
		257	mtspr dbat3l, r30
		258
1738	decky	259	# create empty Page Hash Table
		260	# on top of memory, size 64 KB
1725	decky	261
1738	decky	262	lwz r31, 0(r3) # r31 = memory size
1725	decky	263
1738	decky	264	lis r30, 65536@h
		265	ori r30, r30, 65536@l # r30 = 65536
		266
		267	subi r29, r30, 1 # r29 = 65535
		268
		269	sub r31, r31, r30
		270	andc r31, r31, r29 # pht = ALIGN_DOWN(memory_size - 65536, 65536)
		271
		272	mtsdr1 r31
		273
		274	li r29, 2
		275	srw r30, r30, r29 # r30 = 16384
1728	decky	276	li r29, 0
		277
		278	pht_clear:
		279
1737	decky	280	# write zeroes
		281
1728	decky	282	stw r29, 0(r31)
3856	decky	283	FLUSH_DCACHE r31
1728	decky	284
		285	addi r31, r31, 4
		286	subi r30, r30, 4
		287
		288	cmpwi r30, 0
		289	beq clear_end
		290
		291	bdnz pht_clear
		292
		293	clear_end:
		294
		295	#ifdef CONFIG_BAT
		296
1737	decky	297	# create BAT identity mapping
		298
1738	decky	299	lwz r31, 0(r3) # r31 = memory size
1068	decky	300
1737	decky	301	lis r29, 0x0002
		302	cmpw r31, r29
		303	blt no_bat # less than 128 KB -> no BAT
1068	decky	304
1737	decky	305	li r29, 18
		306	srw r31, r31, r29 # r31 = total >> 18
		307
		308	# create Block Length mask by replicating
		309	# the leading logical one 14 times
		310
		311	li r29, 14
		312	mtctr r31
		313	li r29, 1
		314
		315	bat_mask:
		316	srw r30, r31, r29 # r30 = mask >> 1
		317	or r31, r31, r30 # mask = mask \| r30
		318
		319	bdnz bat_mask
		320
		321	andi. r31, r31, 0x07ff # mask = mask & 0x07ff (BAT can map up to 256 MB)
		322
		323	li r29, 2
		324	slw r31, r31, r29 # mask = mask << 2
		325	ori r31, r31, 0x0002 # mask = mask \| 0x0002 (priviledged access only)
		326
		327	lis r29, 0x8000
		328	or r29, r29, r31
		329
1068	decky	330	lis r30, 0x0000
		331	ori r30, r30, 0x0002
		332
1737	decky	333	mtspr ibat0u, r29
1068	decky	334	mtspr ibat0l, r30
		335
1737	decky	336	mtspr dbat0u, r29
1068	decky	337	mtspr dbat0l, r30
1737	decky	338
		339	no_bat:
3824	decky	340
1728	decky	341	#endif
1068	decky	342
3856	decky	343	# flush TLB
		344
		345	li r31, 0
		346	sync
		347
		348	TLB_FLUSH r31
		349	TLB_FLUSH r31
		350	TLB_FLUSH r31
		351	TLB_FLUSH r31
		352	TLB_FLUSH r31
		353	TLB_FLUSH r31
		354	TLB_FLUSH r31
		355	TLB_FLUSH r31
		356
		357	TLB_FLUSH r31
		358	TLB_FLUSH r31
		359	TLB_FLUSH r31
		360	TLB_FLUSH r31
		361	TLB_FLUSH r31
		362	TLB_FLUSH r31
		363	TLB_FLUSH r31
		364	TLB_FLUSH r31
		365
		366	TLB_FLUSH r31
		367	TLB_FLUSH r31
		368	TLB_FLUSH r31
		369	TLB_FLUSH r31
		370	TLB_FLUSH r31
		371	TLB_FLUSH r31
		372	TLB_FLUSH r31
		373	TLB_FLUSH r31
		374
		375	TLB_FLUSH r31
		376	TLB_FLUSH r31
		377	TLB_FLUSH r31
		378	TLB_FLUSH r31
		379	TLB_FLUSH r31
		380	TLB_FLUSH r31
		381	TLB_FLUSH r31
		382	TLB_FLUSH r31
		383
		384	TLB_FLUSH r31
		385	TLB_FLUSH r31
		386	TLB_FLUSH r31
		387	TLB_FLUSH r31
		388	TLB_FLUSH r31
		389	TLB_FLUSH r31
		390	TLB_FLUSH r31
		391	TLB_FLUSH r31
		392
		393	TLB_FLUSH r31
		394	TLB_FLUSH r31
		395	TLB_FLUSH r31
		396	TLB_FLUSH r31
		397	TLB_FLUSH r31
		398	TLB_FLUSH r31
		399	TLB_FLUSH r31
		400	TLB_FLUSH r31
		401
		402	TLB_FLUSH r31
		403	TLB_FLUSH r31
		404	TLB_FLUSH r31
		405	TLB_FLUSH r31
		406	TLB_FLUSH r31
		407	TLB_FLUSH r31
		408	TLB_FLUSH r31
		409	TLB_FLUSH r31
		410
		411	TLB_FLUSH r31
		412	TLB_FLUSH r31
		413	TLB_FLUSH r31
		414	TLB_FLUSH r31
		415	TLB_FLUSH r31
		416	TLB_FLUSH r31
		417	TLB_FLUSH r31
		418	TLB_FLUSH r31
		419
		420	eieio
1381	decky	421	tlbsync
3856	decky	422	sync
1058	decky	423
		424	# start the kernel
1022	decky	425	#
1728	decky	426	# pc = KERNEL_START_ADDR
1131	decky	427	# r3 = bootinfo (pa)
1728	decky	428	# sprg0 = KA2PA(KERNEL_START_ADDR)
		429	# sprg3 = physical memory size
		430	# sp = 0 (pa)
1022	decky	431
1058	decky	432	lis r31, KERNEL_START_ADDR@ha
		433	addi r31, r31, KERNEL_START_ADDR@l
1022	decky	434
1058	decky	435	mtspr srr0, r31
1022	decky	436
1728	decky	437	subis r31, r31, 0x8000
		438	mtsprg0 r31
		439
		440	lwz r31, 0(r3)
		441	mtsprg3 r31
		442
		443	li sp, 0
		444
1058	decky	445	mfmsr r31
		446	ori r31, r31, (msr_ir \| msr_dr)@l
		447	mtspr srr1, r31
		448
1146	decky	449	sync
		450	isync
1022	decky	451	rfi
1058	decky	452
		453	.align PAGE_WIDTH
		454	.global trans
		455	trans:
		456	.space (TRANS_SIZE * TRANS_ITEM_SIZE)

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