summaryrefslogtreecommitdiff
path: root/arch/powerpc/kernel/85xx_entry_mapping.S
blob: dedc17fac8f806248425d7b668fe0dd6c5e56f36 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
/* SPDX-License-Identifier: GPL-2.0 */

/* 1. Find the index of the entry we're executing in */
	bcl	20,31,$+4				/* Find our address */
invstr:	mflr	r6				/* Make it accessible */
	mfmsr	r7
	rlwinm	r4,r7,27,31,31			/* extract MSR[IS] */
	mfspr	r7, SPRN_PID0
	slwi	r7,r7,16
	or	r7,r7,r4
	mtspr	SPRN_MAS6,r7
	tlbsx	0,r6				/* search MSR[IS], SPID=PID0 */
	mfspr	r7,SPRN_MAS1
	andis.	r7,r7,MAS1_VALID@h
	bne	match_TLB

	mfspr	r7,SPRN_MMUCFG
	rlwinm	r7,r7,21,28,31			/* extract MMUCFG[NPIDS] */
	cmpwi	r7,3
	bne	match_TLB			/* skip if NPIDS != 3 */

	mfspr	r7,SPRN_PID1
	slwi	r7,r7,16
	or	r7,r7,r4
	mtspr	SPRN_MAS6,r7
	tlbsx	0,r6				/* search MSR[IS], SPID=PID1 */
	mfspr	r7,SPRN_MAS1
	andis.	r7,r7,MAS1_VALID@h
	bne	match_TLB
	mfspr	r7, SPRN_PID2
	slwi	r7,r7,16
	or	r7,r7,r4
	mtspr	SPRN_MAS6,r7
	tlbsx	0,r6				/* Fall through, we had to match */

match_TLB:
	mfspr	r7,SPRN_MAS0
	rlwinm	r3,r7,16,20,31			/* Extract MAS0(Entry) */

	mfspr	r7,SPRN_MAS1			/* Insure IPROT set */
	oris	r7,r7,MAS1_IPROT@h
	mtspr	SPRN_MAS1,r7
	tlbwe

/* 2. Invalidate all entries except the entry we're executing in */
	mfspr	r9,SPRN_TLB1CFG
	andi.	r9,r9,0xfff
	li	r6,0				/* Set Entry counter to 0 */
1:	lis	r7,0x1000			/* Set MAS0(TLBSEL) = 1 */
	rlwimi	r7,r6,16,4,15			/* Setup MAS0 = TLBSEL | ESEL(r6) */
	mtspr	SPRN_MAS0,r7
	tlbre
	mfspr	r7,SPRN_MAS1
	rlwinm	r7,r7,0,2,31			/* Clear MAS1 Valid and IPROT */
	cmpw	r3,r6
	beq	skpinv				/* Dont update the current execution TLB */
	mtspr	SPRN_MAS1,r7
	tlbwe
	isync
skpinv:	addi	r6,r6,1				/* Increment */
	cmpw	r6,r9				/* Are we done? */
	bne	1b				/* If not, repeat */

	/* Invalidate TLB0 */
	li	r6,0x04
	tlbivax 0,r6
	TLBSYNC
	/* Invalidate TLB1 */
	li	r6,0x0c
	tlbivax 0,r6
	TLBSYNC

/* 3. Setup a temp mapping and jump to it */
	andi.	r5, r3, 0x1	/* Find an entry not used and is non-zero */
	addi	r5, r5, 0x1
	lis	r7,0x1000	/* Set MAS0(TLBSEL) = 1 */
	rlwimi	r7,r3,16,4,15	/* Setup MAS0 = TLBSEL | ESEL(r3) */
	mtspr	SPRN_MAS0,r7
	tlbre

	/* grab and fixup the RPN */
	mfspr	r6,SPRN_MAS1	/* extract MAS1[SIZE] */
	rlwinm	r6,r6,25,27,31
	li	r8,-1
	addi	r6,r6,10
	slw	r6,r8,r6	/* convert to mask */

	bcl	20,31,$+4	/* Find our address */
1:	mflr	r7

	mfspr	r8,SPRN_MAS3
#ifdef CONFIG_PHYS_64BIT
	mfspr	r23,SPRN_MAS7
#endif
	and	r8,r6,r8
	subfic	r9,r6,-4096
	and	r9,r9,r7

	or	r25,r8,r9
	ori	r8,r25,(MAS3_SX|MAS3_SW|MAS3_SR)

	/* Just modify the entry ID and EPN for the temp mapping */
	lis	r7,0x1000	/* Set MAS0(TLBSEL) = 1 */
	rlwimi	r7,r5,16,4,15	/* Setup MAS0 = TLBSEL | ESEL(r5) */
	mtspr	SPRN_MAS0,r7
	xori	r6,r4,1		/* Setup TMP mapping in the other Address space */
	slwi	r6,r6,12
	oris	r6,r6,(MAS1_VALID|MAS1_IPROT)@h
	ori	r6,r6,(MAS1_TSIZE(BOOK3E_PAGESZ_4K))@l
	mtspr	SPRN_MAS1,r6
	mfspr	r6,SPRN_MAS2
	li	r7,0		/* temp EPN = 0 */
	rlwimi	r7,r6,0,20,31
	mtspr	SPRN_MAS2,r7
	mtspr	SPRN_MAS3,r8
	tlbwe

	xori	r6,r4,1
	slwi	r6,r6,5		/* setup new context with other address space */
	bcl	20,31,$+4	/* Find our address */
1:	mflr	r9
	rlwimi	r7,r9,0,20,31
	addi	r7,r7,(2f - 1b)
	mtspr	SPRN_SRR0,r7
	mtspr	SPRN_SRR1,r6
	rfi
2:
/* 4. Clear out PIDs & Search info */
	li	r6,0
	mtspr   SPRN_MAS6,r6
	mtspr	SPRN_PID0,r6

	mfspr	r7,SPRN_MMUCFG
	rlwinm	r7,r7,21,28,31			/* extract MMUCFG[NPIDS] */
	cmpwi	r7,3
	bne	2f				/* skip if NPIDS != 3 */

	mtspr	SPRN_PID1,r6
	mtspr	SPRN_PID2,r6

/* 5. Invalidate mapping we started in */
2:
	lis	r7,0x1000	/* Set MAS0(TLBSEL) = 1 */
	rlwimi	r7,r3,16,4,15	/* Setup MAS0 = TLBSEL | ESEL(r3) */
	mtspr	SPRN_MAS0,r7
	tlbre
	mfspr	r6,SPRN_MAS1
	rlwinm	r6,r6,0,2,0	/* clear IPROT */
	mtspr	SPRN_MAS1,r6
	tlbwe
	/* Invalidate TLB1 */
	li	r9,0x0c
	tlbivax 0,r9
	TLBSYNC

#if defined(ENTRY_MAPPING_BOOT_SETUP)

/* 6. Setup kernstart_virt_addr mapping in TLB1[0] */
	lis	r6,0x1000		/* Set MAS0(TLBSEL) = TLB1(1), ESEL = 0 */
	mtspr	SPRN_MAS0,r6
	lis	r6,(MAS1_VALID|MAS1_IPROT)@h
	ori	r6,r6,(MAS1_TSIZE(BOOK3E_PAGESZ_64M))@l
	mtspr	SPRN_MAS1,r6
	lis	r6,MAS2_EPN_MASK(BOOK3E_PAGESZ_64M)@h
	ori	r6,r6,MAS2_EPN_MASK(BOOK3E_PAGESZ_64M)@l
	and	r6,r6,r20
	ori	r6,r6,MAS2_M_IF_NEEDED@l
	mtspr	SPRN_MAS2,r6
	mtspr	SPRN_MAS3,r8
	tlbwe

/* 7. Jump to kernstart_virt_addr mapping */
	mr	r6,r20

#elif defined(ENTRY_MAPPING_KEXEC_SETUP)
/*
 * 6. Setup a 1:1 mapping in TLB1. Esel 0 is unsued, 1 or 2 contains the tmp
 * mapping so we start at 3. We setup 8 mappings, each 256MiB in size. This
 * will cover the first 2GiB of memory.
 */

	lis r10, (MAS1_VALID|MAS1_IPROT)@h
	ori r10,r10, (MAS1_TSIZE(BOOK3E_PAGESZ_256M))@l
	li  r11, 0
	li  r0, 8
	mtctr   r0

next_tlb_setup:
	addi	r0, r11, 3
	rlwinm  r0, r0, 16, 4, 15  // Compute esel
	rlwinm  r9, r11, 28, 0, 3   // Compute [ER]PN
	oris    r0, r0, (MAS0_TLBSEL(1))@h
	mtspr   SPRN_MAS0,r0
	mtspr   SPRN_MAS1,r10
	mtspr   SPRN_MAS2,r9
	ori r9, r9, (MAS3_SX|MAS3_SW|MAS3_SR)
	mtspr   SPRN_MAS3,r9
	tlbwe
	addi    r11, r11, 1
	bdnz+   next_tlb_setup

/* 7. Jump to our 1:1 mapping */
	mr	r6, r25
#else
	#error You need to specify the mapping or not use this at all.
#endif

	lis	r7,MSR_KERNEL@h
	ori	r7,r7,MSR_KERNEL@l
	bcl	20,31,$+4		/* Find our address */
1:	mflr	r9
	rlwimi	r6,r9,0,20,31
	addi	r6,r6,(2f - 1b)
	mtspr	SPRN_SRR0,r6
	mtspr	SPRN_SRR1,r7
	rfi				/* start execution out of TLB1[0] entry */

/* 8. Clear out the temp mapping */
2:	lis	r7,0x1000	/* Set MAS0(TLBSEL) = 1 */
	rlwimi	r7,r5,16,4,15	/* Setup MAS0 = TLBSEL | ESEL(r5) */
	mtspr	SPRN_MAS0,r7
	tlbre
	mfspr	r8,SPRN_MAS1
	rlwinm	r8,r8,0,2,0	/* clear IPROT */
	mtspr	SPRN_MAS1,r8
	tlbwe
	/* Invalidate TLB1 */
	li	r9,0x0c
	tlbivax 0,r9
	TLBSYNC