aboutsummaryrefslogtreecommitdiff
path: root/arch/m32r/mm/mmu.S
blob: 9a4d40b3d6a26ceab9c021ba1d558371e1930880 (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
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
/*
 *  linux/arch/m32r/mm/mmu.S
 *
 *  Copyright (C) 2001 by Hiroyuki Kondo
 */

/* $Id: mmu.S,v 1.15 2004/03/16 02:56:27 takata Exp $ */

#include <linux/linkage.h>
#include <asm/assembler.h>
#include <asm/smp.h>

	.text
#ifdef CONFIG_MMU

#include <asm/mmu_context.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/m32r.h>

/*
 * TLB Miss Exception handler
 */
	.balign	16
ENTRY(tme_handler)
	.global	tlb_entry_i_dat
	.global	tlb_entry_d_dat

	SWITCH_TO_KERNEL_STACK

#if defined(CONFIG_ISA_M32R2)
	st	r0, @-sp
	st	r1, @-sp
	st	r2, @-sp
	st	r3, @-sp

	seth	r3, #high(MMU_REG_BASE)
	ld	r1, @(MESTS_offset, r3)	; r1: status     (MESTS reg.)
	ld	r0, @(MDEVP_offset, r3)	; r0: PFN + ASID (MDEVP reg.)
	st	r1, @(MESTS_offset, r3)	; clear status   (MESTS reg.)
	and3	r1, r1, #(MESTS_IT)
	bnez	r1, 1f			; instruction TLB miss?

;; data TLB miss
;;  input
;;   r0: PFN + ASID (MDEVP reg.)
;;   r1 - r3: free
;;  output
;;   r0: PFN + ASID
;;   r1: TLB entry base address
;;   r2: &tlb_entry_{i|d}_dat
;;   r3: free

#ifndef CONFIG_SMP
	seth	r2, #high(tlb_entry_d_dat)
	or3	r2, r2, #low(tlb_entry_d_dat)
#else	/* CONFIG_SMP */
	ldi	r1, #-8192
	seth	r2, #high(tlb_entry_d_dat)
	or3	r2, r2, #low(tlb_entry_d_dat)
	and	r1, sp
	ld	r1, @(16, r1)		; current_thread_info->cpu
	slli	r1, #2
	add	r2, r1
#endif	/* !CONFIG_SMP */
	seth	r1, #high(DTLB_BASE)
	or3	r1, r1, #low(DTLB_BASE)
	bra	2f

	.balign	16
	.fillinsn
1:
;; instrucntion TLB miss
;;  input
;;   r0: MDEVP reg. (included ASID)
;;   r1 - r3: free
;;  output
;;   r0: PFN + ASID
;;   r1: TLB entry base address
;;   r2: &tlb_entry_{i|d}_dat
;;   r3: free
	ldi	r3, #-4096
	and3	r0, r0, #(MMU_CONTEXT_ASID_MASK)
	mvfc	r1, bpc
	and	r1, r3
	or	r0, r1			; r0: PFN + ASID
#ifndef CONFIG_SMP
	seth	r2, #high(tlb_entry_i_dat)
	or3	r2, r2, #low(tlb_entry_i_dat)
#else	/* CONFIG_SMP */
	ldi	r1, #-8192
	seth	r2, #high(tlb_entry_i_dat)
	or3	r2, r2, #low(tlb_entry_i_dat)
	and	r1, sp
	ld	r1, @(16, r1)		; current_thread_info->cpu
	slli	r1, #2
	add	r2, r1
#endif	/* !CONFIG_SMP */
	seth	r1, #high(ITLB_BASE)
	or3	r1, r1, #low(ITLB_BASE)

	.fillinsn
2:
;; select TLB entry
;;  input
;;   r0: PFN + ASID
;;   r1: TLB entry base address
;;   r2: &tlb_entry_{i|d}_dat
;;   r3: free
;;  output
;;   r0: PFN + ASID
;;   r1: TLB entry address
;;   r2, r3: free
#ifdef CONFIG_ISA_DUAL_ISSUE
	ld	r3, @r2		||	srli	r1, #3
#else
	ld	r3, @r2
	srli	r1, #3
#endif
	add	r1, r3
	; tlb_entry_{d|i}_dat++;
	addi	r3, #1
	and3	r3, r3, #(NR_TLB_ENTRIES - 1)
#ifdef CONFIG_ISA_DUAL_ISSUE
	st	r3, @r2		||	slli	r1, #3
#else
	st	r3, @r2
	slli	r1, #3
#endif

;; load pte
;;  input
;;   r0: PFN + ASID
;;   r1: TLB entry address
;;   r2, r3: free
;;  output
;;   r0: PFN + ASID
;;   r1: TLB entry address
;;   r2: pte_data
;;   r3: free
	; pgd = *(unsigned long *)MPTB;
	ld24	r2, #(-MPTB - 1)
	srl3	r3, r0, #22
#ifdef CONFIG_ISA_DUAL_ISSUE
	not	r2, r2		    ||	slli	r3, #2	; r3: pgd offset
#else
	not	r2, r2
	slli	r3, #2
#endif
	ld	r2, @r2			; r2: pgd base addr (MPTB reg.)
	or	r3, r2			; r3: pmd addr

	; pmd = pmd_offset(pgd, address);
	ld	r3, @r3			; r3: pmd data
	ldi	r2, #-4096
	beqz	r3, 3f			; pmd_none(*pmd) ?

	; pte = pte_offset(pmd, address);
	and	r2, r3			; r2: pte base addr
	srl3	r3, r0, #10
	and3	r3, r3, #0xffc		; r3: pte offset
	or	r3, r2
	seth	r2, #0x8000
	or	r3, r2			; r3: pte addr

	; pte_data = (unsigned long)pte_val(*pte);
	ld	r2, @r3			; r2: pte data
	or3	r2, r2, #2		; _PAGE_PRESENT(=2)

	.fillinsn
5:
;; set tlb
;;  input
;;   r0: PFN + ASID
;;   r1: TLB entry address
;;   r2: pte_data
;;   r3: free
	st	r0, @r1			; set_tlb_tag(entry++, address);
	st	r2, @+r1		; set_tlb_data(entry, pte_data);

	.fillinsn
6:
	ld	r3, @sp+
	ld	r2, @sp+
	ld	r1, @sp+
	ld	r0, @sp+
	rte

	.fillinsn
3:
;; error
;;  input
;;   r0: PFN + ASID
;;   r1: TLB entry address
;;   r2, r3: free
;;  output
;;   r0: PFN + ASID
;;   r1: TLB entry address
;;   r2: pte_data
;;   r3: free
#ifdef CONFIG_ISA_DUAL_ISSUE
	bra	5b		    ||	ldi	r2, #2
#else
	ldi	r2, #2		; r2: pte_data = 0 | _PAGE_PRESENT(=2)
	bra	5b
#endif

#elif defined (CONFIG_ISA_M32R)

	st	sp, @-sp
	st	r0, @-sp
	st	r1, @-sp
	st	r2, @-sp
	st	r3, @-sp
	st	r4, @-sp

	seth	r3, #high(MMU_REG_BASE)
	ld	r0, @(MDEVA_offset,r3)	; r0: address  (MDEVA reg.)
	mvfc	r2, bpc			; r2: bpc
	ld	r1, @(MESTS_offset,r3)	; r1: status   (MESTS reg.)
	st	r1, @(MESTS_offset,r3)	; clear status (MESTS reg.)
	and3	r1, r1, #(MESTS_IT)
	beqz	r1, 1f			; data TLB miss?

;; instrucntion TLB miss
	mv	r0, r2			; address = bpc;
	; entry = (unsigned long *)ITLB_BASE+tlb_entry_i*2;
	seth	r3, #shigh(tlb_entry_i_dat)
	ld	r4, @(low(tlb_entry_i_dat),r3)
	sll3	r2, r4, #3
	seth	r1, #high(ITLB_BASE)
	or3	r1, r1, #low(ITLB_BASE)
	add	r2, r1			; r2: entry
	addi	r4, #1			; tlb_entry_i++;
	and3	r4, r4, #(NR_TLB_ENTRIES-1)
	st	r4, @(low(tlb_entry_i_dat),r3)
	bra	2f
	.fillinsn
1:
;; data TLB miss
	; entry = (unsigned long *)DTLB_BASE+tlb_entry_d*2;
	seth	r3, #shigh(tlb_entry_d_dat)
	ld	r4, @(low(tlb_entry_d_dat),r3)
	sll3	r2, r4, #3
	seth	r1, #high(DTLB_BASE)
	or3	r1, r1, #low(DTLB_BASE)
	add	r2, r1			; r2: entry
	addi	r4, #1			; tlb_entry_d++;
	and3	r4, r4, #(NR_TLB_ENTRIES-1)
	st	r4, @(low(tlb_entry_d_dat),r3)
	.fillinsn
2:
;; load pte
; r0: address, r2: entry
; r1,r3,r4: (free)
	; pgd = *(unsigned long *)MPTB;
	ld24	r1, #(-MPTB-1)
	not	r1, r1
	ld	r1, @r1
	srl3	r4, r0, #22
	sll3	r3, r4, #2
	add	r3, r1			; r3: pgd
	; pmd = pmd_offset(pgd, address);
	ld	r1, @r3			; r1: pmd
	beqz	r1, 3f			; pmd_none(*pmd) ?
;
	and3	r1, r1, #0xeff
	ldi	r4, #611		; _KERNPG_TABLE(=611)
	beq	r1, r4, 4f		; !pmd_bad(*pmd) ?
	.fillinsn
3:
	ldi	r1, #0			; r1: pte_data = 0
	bra	5f
	.fillinsn
4:
	; pte = pte_offset(pmd, address);
	ld	r4, @r3			; r4: pte
	ldi	r3, #-4096
	and	r4, r3
	srl3	r3, r0, #10
	and3	r3, r3, #0xffc
	add	r4, r3
	seth	r3, #0x8000
	add	r4, r3			; r4: pte
	; pte_data = (unsigned long)pte_val(*pte);
	ld	r1, @r4			; r1: pte_data
	.fillinsn

;; set tlb
; r0: address, r1: pte_data, r2: entry
; r3,r4: (free)
5:
	ldi	r3, #-4096		; set_tlb_tag(entry++, address);
	and	r3, r0
	seth	r4, #shigh(MASID)
	ld	r4, @(low(MASID),r4)	; r4: MASID
	and3	r4, r4, #(MMU_CONTEXT_ASID_MASK)
	or	r3, r4
	st	r3, @r2
	or3	r4, r1, #2		; _PAGE_PRESENT(=2)
	st	r4, @(4,r2)		; set_tlb_data(entry, pte_data);

	ld	r4, @sp+
	ld	r3, @sp+
	ld	r2, @sp+
	ld	r1, @sp+
	ld	r0, @sp+
	ld	sp, @sp+
	rte

#else
#error unknown isa configuration
#endif

ENTRY(init_tlb)
;; Set MMU Register
	seth	r0, #high(MMU_REG_BASE)	 ; Set MMU_REG_BASE higher
	or3	r0, r0, #low(MMU_REG_BASE)  ; Set MMU_REG_BASE lower
	ldi	r1, #0
	st	r1, @(MPSZ_offset,r0)	; Set MPSZ Reg(Page size 4KB:0 16KB:1 64KB:2)
	ldi	r1, #0
	st	r1, @(MASID_offset,r0)	; Set ASID Zero

;; Set TLB
	seth	r0, #high(ITLB_BASE)	; Set ITLB_BASE higher
	or3	r0, r0, #low(ITLB_BASE)	; Set ITLB_BASE lower
	seth	r1, #high(DTLB_BASE)	; Set DTLB_BASE higher
	or3	r1, r1, #low(DTLB_BASE)	; Set DTLB_BASE lower
	ldi	r2, #0
	ldi	r3, #NR_TLB_ENTRIES
	addi	r0, #-4
	addi	r1, #-4
clear_tlb:
	st	r2, @+r0		; VPA <- 0
	st	r2, @+r0		; PPA <- 0
	st	r2, @+r1		; VPA <- 0
	st	r2, @+r1		; PPA <- 0
	addi	r3, #-1
	bnez	r3, clear_tlb
;;
	jmp	r14

ENTRY(m32r_itlb_entrys)
ENTRY(m32r_otlb_entrys)

#endif  /* CONFIG_MMU */

.end