WebSVN – HelenOS – Diff – /trunk/boot/arch/ppc64/loader/asm.S


#
# Copyright (c) 2006 Martin Decky
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# - Redistributions of source code must retain the above copyright
#   notice, this list of conditions and the following disclaimer.
# - Redistributions in binary form must reproduce the above copyright
#   notice, this list of conditions and the following disclaimer in the
#   documentation and/or other materials provided with the distribution.
# - The name of the author may not be used to endorse or promote products
#   derived from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
 
#include "asm.h"
#include "regname.h"
 
 
.text
 
.global halt
.global memcpy
.global jump_to_kernel
 
halt:
	b halt
 
memcpy:
	srwi. r7, r5, 3
	addi r6, r3, -4
	addi r4, r4, -4
	beq	2f
	
	andi. r0, r6, 3
	mtctr r7
	bne 5f
	
	1:
	
	lwz r7, 4(r4)
	lwzu r8, 8(r4)
	stw r7, 4(r6)
	stwu r8, 8(r6)
	bdnz 1b
	
	andi. r5, r5, 7
	
	2:
	
	cmplwi 0, r5, 4
	blt 3f
	
	lwzu r0, 4(r4)
	addi r5, r5, -4
	stwu r0, 4(r6)
	
	3:
	
	cmpwi 0, r5, 0
	beqlr
	mtctr r5
	addi r4, r4, 3
	addi r6, r6, 3
	
	4:
	
	lbzu r0, 1(r4)
	stbu r0, 1(r6)
	bdnz 4b
	blr
	
	5:
	
	subfic r0, r0, 4
	mtctr r0
	
	6:
	
	lbz r7, 4(r4)
	addi r4, r4, 1
	stb r7, 4(r6)
	addi r6, r6, 1
	bdnz 6b
	subf r5, r0, r5
	rlwinm. r7, r5, 32-3, 3, 31
	beq 2b
	mtctr r7
	b 1b
 
 
jump_to_kernel:
	
	# r3 = bootinfo (pa)
	# r4 = bootinfo_size
	# r5 = trans (pa)
	# r6 = bytes to copy
	# r7 = real_mode (pa)
	# r8 = framebuffer (pa)
	# r9 = scanline
	
	# disable interrupts
	
	mfmsr r31
	rlwinm r31, r31, 0, 17, 15
	mtmsr r31
	
	# set real_mode meeting point address
	
	mtspr srr0, r7
	
	# jumps to real_mode
	
	mfmsr r31
	lis r30, ~0@h
	ori r30, r30, ~(msr_ir | msr_dr)@l
	and r31, r31, r30
	mtspr srr1, r31
	
	sync
	isync
	rfid
 
.section REALMODE, "ax"
.align PAGE_WIDTH
.global real_mode
 
real_mode:
	
 
 
 
	# copy kernel to proper location
	#
	# r5 = trans (pa)
	# r6 = bytes to copy
	# r8 = framebuffer (pa)
	# r9 = scanline
	
	li r31, PAGE_SIZE >> 2
	li r30, 0
	
	page_copy:
		
		cmpwi r6, 0
		beq copy_end
		
		# copy page
		
		mtctr r31
		lwz r29, 0(r5)
		
 
 
 
		copy_loop:
			
			lwz r28, 0(r29)
			stw r28, 0(r30)
			
			addi r29, r29, 4
			addi r30, r30, 4
			subi r6, r6, 4
			
			cmpwi r6, 0
			beq copy_end
			
			bdnz copy_loop
			
 
 
		addi r5, r5, 4
		b page_copy
	
	copy_end:
	
 
 
	# initially fill segment registers
	
	li r31, 0
	
	li r29, 8
	mtctr r29
	li r30, 0                     # ASID 0 (VSIDs 0 .. 7)
 
	seg_fill_uspace:
	
		mtsrin r30, r31
		addi r30, r30, 1
		addis r31, r31, 0x1000    # move to next SR
		
		bdnz seg_fill_uspace
	
	li r29, 8
	mtctr r29
	lis r30, 0x4000               # priviledged access only
	ori r30, r30, 8               # ASID 0 (VSIDs 8 .. 15)
	
	seg_fill_kernel:
	
		mtsrin r30, r31
		addi r30, r30, 1
		addis r31, r31, 0x1000    # move to next SR
		
		bdnz seg_fill_kernel
	
	# create empty Page Hash Table
	# on top of memory, size 64 KB
	
 
 
	lwz r31, 0(r3)                # r31 = memory size
	
	lis r30, 65536@h
	ori r30, r30, 65536@l         # r30 = 65536
	
	subi r29, r30, 1              # r29 = 65535
	
	sub r31, r31, r30
	andc r31, r31, r29            # pht = ALIGN_DOWN(memory_size - 65536, 65536)
	
	mtsdr1 r31
	
	li r29, 2
	srw r30, r30, r29             # r30 = 16384
	li r29, 0
	
	pht_clear:
		
		# write zeroes
		
		stw r29, 0(r31)
		
		addi r31, r31, 4
		subi r30, r30, 4
		
		cmpwi r30, 0
		beq clear_end
		
		bdnz pht_clear
 
 
		
	clear_end:
	
 
 
 
	tlbsync
	
 
 
	# start the kernel
	#
	# pc = KERNEL_START_ADDR
	# r3 = bootinfo (pa)
	# sprg0 = KA2PA(KERNEL_START_ADDR)
	# sprg3 = physical memory size
	# sp = 0 (pa)
	
	lis r31, KERNEL_START_ADDR@ha
	addi r31, r31, KERNEL_START_ADDR@l
	
	mtspr srr0, r31
	
	subis r31, r31, 0x8000
	mtsprg0 r31
	
	lwz r31, 0(r3)
	mtsprg3 r31
	
	li sp, 0
	
	mfmsr r31
	ori r31, r31, (msr_ir | msr_dr)@l
	mtspr srr1, r31
	
	sync
	isync
 
 
	rfid
 
.align PAGE_WIDTH
.global trans
trans:
	.space (TRANS_SIZE * TRANS_ITEM_SIZE)
 

Rev 2071	Rev 3825
1	#	1	#
2	# Copyright (c) 2006 Martin Decky	2	# Copyright (c) 2006 Martin Decky
3	# All rights reserved.	3	# All rights reserved.
4	#	4	#
5	# Redistribution and use in source and binary forms, with or without	5	# Redistribution and use in source and binary forms, with or without
6	# modification, are permitted provided that the following conditions	6	# modification, are permitted provided that the following conditions
7	# are met:	7	# are met:
8	#	8	#
9	# - Redistributions of source code must retain the above copyright	9	# - Redistributions of source code must retain the above copyright
10	# notice, this list of conditions and the following disclaimer.	10	# notice, this list of conditions and the following disclaimer.
11	# - Redistributions in binary form must reproduce the above copyright	11	# - Redistributions in binary form must reproduce the above copyright
12	# notice, this list of conditions and the following disclaimer in the	12	# notice, this list of conditions and the following disclaimer in the
13	# documentation and/or other materials provided with the distribution.	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	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.	15	# derived from this software without specific prior written permission.
16	#	16	#
17	# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR	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	18	# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19	# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.	19	# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20	# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,	20	# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21	# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT	21	# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22	# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,	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	23	# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24	# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT	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	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.	26	# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27	#	27	#
28		28
29	#include "asm.h"	29	#include "asm.h"
30	#include "regname.h"	30	#include "regname.h"
31	#include "debug.inc"	-
32		31
33	.text	32	.text
34		33
35	.global halt	34	.global halt
36	.global memcpy	35	.global memcpy
37	.global jump_to_kernel	36	.global jump_to_kernel
38		37
39	halt:	38	halt:
40	b halt	39	b halt
41		40
42	memcpy:	41	memcpy:
43	srwi. r7, r5, 3	42	srwi. r7, r5, 3
44	addi r6, r3, -4	43	addi r6, r3, -4
45	addi r4, r4, -4	44	addi r4, r4, -4
46	beq 2f	45	beq 2f
47		46
48	andi. r0, r6, 3	47	andi. r0, r6, 3
49	mtctr r7	48	mtctr r7
50	bne 5f	49	bne 5f
51		50
52	1:	51	1:
53		52
54	lwz r7, 4(r4)	53	lwz r7, 4(r4)
55	lwzu r8, 8(r4)	54	lwzu r8, 8(r4)
56	stw r7, 4(r6)	55	stw r7, 4(r6)
57	stwu r8, 8(r6)	56	stwu r8, 8(r6)
58	bdnz 1b	57	bdnz 1b
59		58
60	andi. r5, r5, 7	59	andi. r5, r5, 7
61		60
62	2:	61	2:
63		62
64	cmplwi 0, r5, 4	63	cmplwi 0, r5, 4
65	blt 3f	64	blt 3f
66		65
67	lwzu r0, 4(r4)	66	lwzu r0, 4(r4)
68	addi r5, r5, -4	67	addi r5, r5, -4
69	stwu r0, 4(r6)	68	stwu r0, 4(r6)
70		69
71	3:	70	3:
72		71
73	cmpwi 0, r5, 0	72	cmpwi 0, r5, 0
74	beqlr	73	beqlr
75	mtctr r5	74	mtctr r5
76	addi r4, r4, 3	75	addi r4, r4, 3
77	addi r6, r6, 3	76	addi r6, r6, 3
78		77
79	4:	78	4:
80		79
81	lbzu r0, 1(r4)	80	lbzu r0, 1(r4)
82	stbu r0, 1(r6)	81	stbu r0, 1(r6)
83	bdnz 4b	82	bdnz 4b
84	blr	83	blr
85		84
86	5:	85	5:
87		86
88	subfic r0, r0, 4	87	subfic r0, r0, 4
89	mtctr r0	88	mtctr r0
90		89
91	6:	90	6:
92		91
93	lbz r7, 4(r4)	92	lbz r7, 4(r4)
94	addi r4, r4, 1	93	addi r4, r4, 1
95	stb r7, 4(r6)	94	stb r7, 4(r6)
96	addi r6, r6, 1	95	addi r6, r6, 1
97	bdnz 6b	96	bdnz 6b
98	subf r5, r0, r5	97	subf r5, r0, r5
99	rlwinm. r7, r5, 32-3, 3, 31	98	rlwinm. r7, r5, 32-3, 3, 31
100	beq 2b	99	beq 2b
101	mtctr r7	100	mtctr r7
102	b 1b	101	b 1b
103		102
104		103
105	jump_to_kernel:	104	jump_to_kernel:
106		105
107	# r3 = bootinfo (pa)	106	# r3 = bootinfo (pa)
108	# r4 = bootinfo_size	107	# r4 = bootinfo_size
109	# r5 = trans (pa)	108	# r5 = trans (pa)
110	# r6 = bytes to copy	109	# r6 = bytes to copy
111	# r7 = real_mode (pa)	110	# r7 = real_mode (pa)
112	# r8 = framebuffer (pa)	111	# r8 = framebuffer (pa)
113	# r9 = scanline	112	# r9 = scanline
114		113
115	# disable interrupts	114	# disable interrupts
116		115
117	mfmsr r31	116	mfmsr r31
118	rlwinm r31, r31, 0, 17, 15	117	rlwinm r31, r31, 0, 17, 15
119	mtmsr r31	118	mtmsr r31
120		119
121	# set real_mode meeting point address	120	# set real_mode meeting point address
122		121
123	mtspr srr0, r7	122	mtspr srr0, r7
124		123
125	# jumps to real_mode	124	# jumps to real_mode
126		125
127	mfmsr r31	126	mfmsr r31
128	lis r30, ~0@h	127	lis r30, ~0@h
129	ori r30, r30, ~(msr_ir \| msr_dr)@l	128	ori r30, r30, ~(msr_ir \| msr_dr)@l
130	and r31, r31, r30	129	and r31, r31, r30
131	mtspr srr1, r31	130	mtspr srr1, r31
132		131
133	sync	132	sync
134	isync	133	isync
135	rfid	134	rfid
136		135
137	.section REALMODE, "ax"	136	.section REALMODE, "ax"
138	.align PAGE_WIDTH	137	.align PAGE_WIDTH
139	.global real_mode	138	.global real_mode
140		139
141	real_mode:	140	real_mode:
142		141
143	DEBUG_INIT	-
144	DEBUG_real_mode	-
145		-
146	# copy kernel to proper location	142	# copy kernel to proper location
147	#	143	#
148	# r5 = trans (pa)	144	# r5 = trans (pa)
149	# r6 = bytes to copy	145	# r6 = bytes to copy
150	# r8 = framebuffer (pa)	146	# r8 = framebuffer (pa)
151	# r9 = scanline	147	# r9 = scanline
152		148
153	li r31, PAGE_SIZE >> 2	149	li r31, PAGE_SIZE >> 2
154	li r30, 0	150	li r30, 0
155		151
156	page_copy:	152	page_copy:
157		153
158	cmpwi r6, 0	154	cmpwi r6, 0
159	beq copy_end	155	beq copy_end
160		156
161	# copy page	157	# copy page
162		158
163	mtctr r31	159	mtctr r31
164	lwz r29, 0(r5)	160	lwz r29, 0(r5)
165		161
166	DEBUG_INIT	-
167	DEBUG_copy_loop	-
168		-
169	copy_loop:	162	copy_loop:
170		163
171	lwz r28, 0(r29)	164	lwz r28, 0(r29)
172	stw r28, 0(r30)	165	stw r28, 0(r30)
173		166
174	addi r29, r29, 4	167	addi r29, r29, 4
175	addi r30, r30, 4	168	addi r30, r30, 4
176	subi r6, r6, 4	169	subi r6, r6, 4
177		170
178	cmpwi r6, 0	171	cmpwi r6, 0
179	beq copy_end	172	beq copy_end
180		173
181	bdnz copy_loop	174	bdnz copy_loop
182		175
183	DEBUG_end_copy_loop	-
184		-
185	addi r5, r5, 4	176	addi r5, r5, 4
186	b page_copy	177	b page_copy
187		178
188	copy_end:	179	copy_end:
189		180
190	DEBUG_segments	-
191		-
192	# initially fill segment registers	181	# initially fill segment registers
193		182
194	li r31, 0	183	li r31, 0
195		184
196	li r29, 8	185	li r29, 8
197	mtctr r29	186	mtctr r29
198	li r30, 0 # ASID 0 (VSIDs 0 .. 7)	187	li r30, 0 # ASID 0 (VSIDs 0 .. 7)
199		188
200	seg_fill_uspace:	189	seg_fill_uspace:
201		190
202	mtsrin r30, r31	191	mtsrin r30, r31
203	addi r30, r30, 1	192	addi r30, r30, 1
204	addis r31, r31, 0x1000 # move to next SR	193	addis r31, r31, 0x1000 # move to next SR
205		194
206	bdnz seg_fill_uspace	195	bdnz seg_fill_uspace
207		196
208	li r29, 8	197	li r29, 8
209	mtctr r29	198	mtctr r29
210	lis r30, 0x4000 # priviledged access only	199	lis r30, 0x4000 # priviledged access only
211	ori r30, r30, 8 # ASID 0 (VSIDs 8 .. 15)	200	ori r30, r30, 8 # ASID 0 (VSIDs 8 .. 15)
212		201
213	seg_fill_kernel:	202	seg_fill_kernel:
214		203
215	mtsrin r30, r31	204	mtsrin r30, r31
216	addi r30, r30, 1	205	addi r30, r30, 1
217	addis r31, r31, 0x1000 # move to next SR	206	addis r31, r31, 0x1000 # move to next SR
218		207
219	bdnz seg_fill_kernel	208	bdnz seg_fill_kernel
220		209
221	# create empty Page Hash Table	210	# create empty Page Hash Table
222	# on top of memory, size 64 KB	211	# on top of memory, size 64 KB
223		212
224	DEBUG_pht	-
225		-
226	lwz r31, 0(r3) # r31 = memory size	213	lwz r31, 0(r3) # r31 = memory size
227		214
228	lis r30, 65536@h	215	lis r30, 65536@h
229	ori r30, r30, 65536@l # r30 = 65536	216	ori r30, r30, 65536@l # r30 = 65536
230		217
231	subi r29, r30, 1 # r29 = 65535	218	subi r29, r30, 1 # r29 = 65535
232		219
233	sub r31, r31, r30	220	sub r31, r31, r30
234	andc r31, r31, r29 # pht = ALIGN_DOWN(memory_size - 65536, 65536)	221	andc r31, r31, r29 # pht = ALIGN_DOWN(memory_size - 65536, 65536)
235		222
236	mtsdr1 r31	223	mtsdr1 r31
237		224
238	li r29, 2	225	li r29, 2
239	srw r30, r30, r29 # r30 = 16384	226	srw r30, r30, r29 # r30 = 16384
240	li r29, 0	227	li r29, 0
241		228
242	pht_clear:	229	pht_clear:
243		230
244	# write zeroes	231	# write zeroes
245		232
246	stw r29, 0(r31)	233	stw r29, 0(r31)
247		234
248	addi r31, r31, 4	235	addi r31, r31, 4
249	subi r30, r30, 4	236	subi r30, r30, 4
250		237
251	cmpwi r30, 0	238	cmpwi r30, 0
252	beq clear_end	239	beq clear_end
253		240
254	bdnz pht_clear	241	bdnz pht_clear
255		-
256	DEBUG_end_pht_clear	-
257		242
258	clear_end:	243	clear_end:
259		244
260	DEBUG_tlb	-
261		-
262	tlbia	-
263	tlbsync	245	tlbsync
264		246
265	DEBUG_prepare	-
266		-
267	# start the kernel	247	# start the kernel
268	#	248	#
269	# pc = KERNEL_START_ADDR	249	# pc = KERNEL_START_ADDR
270	# r3 = bootinfo (pa)	250	# r3 = bootinfo (pa)
271	# sprg0 = KA2PA(KERNEL_START_ADDR)	251	# sprg0 = KA2PA(KERNEL_START_ADDR)
272	# sprg3 = physical memory size	252	# sprg3 = physical memory size
273	# sp = 0 (pa)	253	# sp = 0 (pa)
274		254
275	lis r31, KERNEL_START_ADDR@ha	255	lis r31, KERNEL_START_ADDR@ha
276	addi r31, r31, KERNEL_START_ADDR@l	256	addi r31, r31, KERNEL_START_ADDR@l
277		257
278	mtspr srr0, r31	258	mtspr srr0, r31
279		259
280	subis r31, r31, 0x8000	260	subis r31, r31, 0x8000
281	mtsprg0 r31	261	mtsprg0 r31
282		262
283	lwz r31, 0(r3)	263	lwz r31, 0(r3)
284	mtsprg3 r31	264	mtsprg3 r31
285		265
286	li sp, 0	266	li sp, 0
287		267
288	mfmsr r31	268	mfmsr r31
289	ori r31, r31, (msr_ir \| msr_dr)@l	269	ori r31, r31, (msr_ir \| msr_dr)@l
290	mtspr srr1, r31	270	mtspr srr1, r31
291		271
292	sync	272	sync
293	isync	273	isync
294		-
295	DEBUG_rfi	-
296	rfid	274	rfid
297		275
298	.align PAGE_WIDTH	276	.align PAGE_WIDTH
299	.global trans	277	.global trans
300	trans:	278	trans:
301	.space (TRANS_SIZE * TRANS_ITEM_SIZE)	279	.space (TRANS_SIZE * TRANS_ITEM_SIZE)
302		280

Subversion Repositories HelenOS

(root)/trunk/boot/arch/ppc64/loader/asm.S – Rev 2071 → 3825