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i2c/vt8231: Remove superfluous initialization
[linux-2.6/mini2440.git] / include / asm-mips / stackframe.h
blob1fae5dc581381cd4de2b1022023a53c1acf6647a
1 /*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 1994, 95, 96, 99, 2001 Ralf Baechle
7 * Copyright (C) 1994, 1995, 1996 Paul M. Antoine.
8 * Copyright (C) 1999 Silicon Graphics, Inc.
9 */
10 #ifndef _ASM_STACKFRAME_H
11 #define _ASM_STACKFRAME_H
12
13 #include <linux/threads.h>
14
15 #include <asm/asm.h>
16 #include <asm/asmmacro.h>
17 #include <asm/mipsregs.h>
18 #include <asm/asm-offsets.h>
19
20 #ifdef CONFIG_MIPS_MT_SMTC
21 #include <asm/mipsmtregs.h>
22 #endif /* CONFIG_MIPS_MT_SMTC */
23
24 .macro SAVE_AT
25 .set push
26 .set noat
27 LONG_S $1, PT_R1(sp)
28 .set pop
29 .endm
30
31 .macro SAVE_TEMP
32 mfhi v1
33 #ifdef CONFIG_32BIT
34 LONG_S $8, PT_R8(sp)
35 LONG_S $9, PT_R9(sp)
36 #endif
37 LONG_S v1, PT_HI(sp)
38 mflo v1
39 LONG_S $10, PT_R10(sp)
40 LONG_S $11, PT_R11(sp)
41 LONG_S v1, PT_LO(sp)
42 LONG_S $12, PT_R12(sp)
43 LONG_S $13, PT_R13(sp)
44 LONG_S $14, PT_R14(sp)
45 LONG_S $15, PT_R15(sp)
46 LONG_S $24, PT_R24(sp)
47 .endm
48
49 .macro SAVE_STATIC
50 LONG_S $16, PT_R16(sp)
51 LONG_S $17, PT_R17(sp)
52 LONG_S $18, PT_R18(sp)
53 LONG_S $19, PT_R19(sp)
54 LONG_S $20, PT_R20(sp)
55 LONG_S $21, PT_R21(sp)
56 LONG_S $22, PT_R22(sp)
57 LONG_S $23, PT_R23(sp)
58 LONG_S $30, PT_R30(sp)
59 .endm
60
61 #ifdef CONFIG_SMP
62 #ifdef CONFIG_MIPS_MT_SMTC
63 #define PTEBASE_SHIFT 19 /* TCBIND */
64 #else
65 #define PTEBASE_SHIFT 23 /* CONTEXT */
66 #endif
67 .macro get_saved_sp /* SMP variation */
68 #ifdef CONFIG_MIPS_MT_SMTC
69 mfc0 k0, CP0_TCBIND
70 #else
71 MFC0 k0, CP0_CONTEXT
72 #endif
73 #if defined(CONFIG_BUILD_ELF64) || (defined(CONFIG_64BIT) && __GNUC__ < 4)
74 lui k1, %highest(kernelsp)
75 daddiu k1, %higher(kernelsp)
76 dsll k1, 16
77 daddiu k1, %hi(kernelsp)
78 dsll k1, 16
79 #else
80 lui k1, %hi(kernelsp)
81 #endif
82 LONG_SRL k0, PTEBASE_SHIFT
83 LONG_ADDU k1, k0
84 LONG_L k1, %lo(kernelsp)(k1)
85 .endm
86
87 .macro set_saved_sp stackp temp temp2
88 #ifdef CONFIG_MIPS_MT_SMTC
89 mfc0 \temp, CP0_TCBIND
90 #else
91 MFC0 \temp, CP0_CONTEXT
92 #endif
93 LONG_SRL \temp, PTEBASE_SHIFT
94 LONG_S \stackp, kernelsp(\temp)
95 .endm
96 #else
97 .macro get_saved_sp /* Uniprocessor variation */
98 #if defined(CONFIG_BUILD_ELF64) || (defined(CONFIG_64BIT) && __GNUC__ < 4)
99 lui k1, %highest(kernelsp)
100 daddiu k1, %higher(kernelsp)
101 dsll k1, k1, 16
102 daddiu k1, %hi(kernelsp)
103 dsll k1, k1, 16
104 #else
105 lui k1, %hi(kernelsp)
106 #endif
107 LONG_L k1, %lo(kernelsp)(k1)
108 .endm
109
110 .macro set_saved_sp stackp temp temp2
111 LONG_S \stackp, kernelsp
112 .endm
113 #endif
114
115 .macro SAVE_SOME
116 .set push
117 .set noat
118 .set reorder
119 mfc0 k0, CP0_STATUS
120 sll k0, 3 /* extract cu0 bit */
121 .set noreorder
122 bltz k0, 8f
123 move k1, sp
124 .set reorder
125 /* Called from user mode, new stack. */
126 get_saved_sp
127 8: move k0, sp
128 PTR_SUBU sp, k1, PT_SIZE
129 LONG_S k0, PT_R29(sp)
130 LONG_S $3, PT_R3(sp)
131 /*
132 * You might think that you don't need to save $0,
133 * but the FPU emulator and gdb remote debug stub
134 * need it to operate correctly
135 */
136 LONG_S $0, PT_R0(sp)
137 mfc0 v1, CP0_STATUS
138 LONG_S $2, PT_R2(sp)
139 LONG_S v1, PT_STATUS(sp)
140 #ifdef CONFIG_MIPS_MT_SMTC
141 /*
142 * Ideally, these instructions would be shuffled in
143 * to cover the pipeline delay.
144 */
145 .set mips32
146 mfc0 v1, CP0_TCSTATUS
147 .set mips0
148 LONG_S v1, PT_TCSTATUS(sp)
149 #endif /* CONFIG_MIPS_MT_SMTC */
150 LONG_S $4, PT_R4(sp)
151 mfc0 v1, CP0_CAUSE
152 LONG_S $5, PT_R5(sp)
153 LONG_S v1, PT_CAUSE(sp)
154 LONG_S $6, PT_R6(sp)
155 MFC0 v1, CP0_EPC
156 LONG_S $7, PT_R7(sp)
157 #ifdef CONFIG_64BIT
158 LONG_S $8, PT_R8(sp)
159 LONG_S $9, PT_R9(sp)
160 #endif
161 LONG_S v1, PT_EPC(sp)
162 LONG_S $25, PT_R25(sp)
163 LONG_S $28, PT_R28(sp)
164 LONG_S $31, PT_R31(sp)
165 ori $28, sp, _THREAD_MASK
166 xori $28, _THREAD_MASK
167 .set pop
168 .endm
169
170 .macro SAVE_ALL
171 SAVE_SOME
172 SAVE_AT
173 SAVE_TEMP
174 SAVE_STATIC
175 .endm
176
177 .macro RESTORE_AT
178 .set push
179 .set noat
180 LONG_L $1, PT_R1(sp)
181 .set pop
182 .endm
183
184 .macro RESTORE_TEMP
185 LONG_L $24, PT_LO(sp)
186 #ifdef CONFIG_32BIT
187 LONG_L $8, PT_R8(sp)
188 LONG_L $9, PT_R9(sp)
189 #endif
190 mtlo $24
191 LONG_L $24, PT_HI(sp)
192 LONG_L $10, PT_R10(sp)
193 LONG_L $11, PT_R11(sp)
194 mthi $24
195 LONG_L $12, PT_R12(sp)
196 LONG_L $13, PT_R13(sp)
197 LONG_L $14, PT_R14(sp)
198 LONG_L $15, PT_R15(sp)
199 LONG_L $24, PT_R24(sp)
200 .endm
201
202 .macro RESTORE_STATIC
203 LONG_L $16, PT_R16(sp)
204 LONG_L $17, PT_R17(sp)
205 LONG_L $18, PT_R18(sp)
206 LONG_L $19, PT_R19(sp)
207 LONG_L $20, PT_R20(sp)
208 LONG_L $21, PT_R21(sp)
209 LONG_L $22, PT_R22(sp)
210 LONG_L $23, PT_R23(sp)
211 LONG_L $30, PT_R30(sp)
212 .endm
213
214 #if defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX)
215
216 .macro RESTORE_SOME
217 .set push
218 .set reorder
219 .set noat
220 mfc0 a0, CP0_STATUS
221 ori a0, 0x1f
222 xori a0, 0x1f
223 mtc0 a0, CP0_STATUS
224 li v1, 0xff00
225 and a0, v1
226 LONG_L v0, PT_STATUS(sp)
227 nor v1, $0, v1
228 and v0, v1
229 or v0, a0
230 mtc0 v0, CP0_STATUS
231 LONG_L $31, PT_R31(sp)
232 LONG_L $28, PT_R28(sp)
233 LONG_L $25, PT_R25(sp)
234 #ifdef CONFIG_64BIT
235 LONG_L $8, PT_R8(sp)
236 LONG_L $9, PT_R9(sp)
237 #endif
238 LONG_L $7, PT_R7(sp)
239 LONG_L $6, PT_R6(sp)
240 LONG_L $5, PT_R5(sp)
241 LONG_L $4, PT_R4(sp)
242 LONG_L $3, PT_R3(sp)
243 LONG_L $2, PT_R2(sp)
244 .set pop
245 .endm
246
247 .macro RESTORE_SP_AND_RET
248 .set push
249 .set noreorder
250 LONG_L k0, PT_EPC(sp)
251 LONG_L sp, PT_R29(sp)
252 jr k0
253 rfe
254 .set pop
255 .endm
256
257 #else
258 /*
259 * For SMTC kernel, global IE should be left set, and interrupts
260 * controlled exclusively via IXMT.
261 */
262
263 #ifdef CONFIG_MIPS_MT_SMTC
264 #define STATMASK 0x1e
265 #else
266 #define STATMASK 0x1f
267 #endif
268 .macro RESTORE_SOME
269 .set push
270 .set reorder
271 .set noat
272 #ifdef CONFIG_MIPS_MT_SMTC
273 .set mips32r2
274 /*
275 * This may not really be necessary if ints are already
276 * inhibited here.
277 */
278 mfc0 v0, CP0_TCSTATUS
279 ori v0, TCSTATUS_IXMT
280 mtc0 v0, CP0_TCSTATUS
281 _ehb
282 DMT 5 # dmt a1
283 jal mips_ihb
284 #endif /* CONFIG_MIPS_MT_SMTC */
285 mfc0 a0, CP0_STATUS
286 ori a0, STATMASK
287 xori a0, STATMASK
288 mtc0 a0, CP0_STATUS
289 li v1, 0xff00
290 and a0, v1
291 LONG_L v0, PT_STATUS(sp)
292 nor v1, $0, v1
293 and v0, v1
294 or v0, a0
295 mtc0 v0, CP0_STATUS
296 #ifdef CONFIG_MIPS_MT_SMTC
297 /*
298 * Only after EXL/ERL have been restored to status can we
299 * restore TCStatus.IXMT.
300 */
301 LONG_L v1, PT_TCSTATUS(sp)
302 _ehb
303 mfc0 v0, CP0_TCSTATUS
304 andi v1, TCSTATUS_IXMT
305 /* We know that TCStatua.IXMT should be set from above */
306 xori v0, v0, TCSTATUS_IXMT
307 or v0, v0, v1
308 mtc0 v0, CP0_TCSTATUS
309 _ehb
310 andi a1, a1, VPECONTROL_TE
311 beqz a1, 1f
312 emt
313 1:
314 .set mips0
315 #endif /* CONFIG_MIPS_MT_SMTC */
316 LONG_L v1, PT_EPC(sp)
317 MTC0 v1, CP0_EPC
318 LONG_L $31, PT_R31(sp)
319 LONG_L $28, PT_R28(sp)
320 LONG_L $25, PT_R25(sp)
321 #ifdef CONFIG_64BIT
322 LONG_L $8, PT_R8(sp)
323 LONG_L $9, PT_R9(sp)
324 #endif
325 LONG_L $7, PT_R7(sp)
326 LONG_L $6, PT_R6(sp)
327 LONG_L $5, PT_R5(sp)
328 LONG_L $4, PT_R4(sp)
329 LONG_L $3, PT_R3(sp)
330 LONG_L $2, PT_R2(sp)
331 .set pop
332 .endm
333
334 .macro RESTORE_SP_AND_RET
335 LONG_L sp, PT_R29(sp)
336 .set mips3
337 eret
338 .set mips0
339 .endm
340
341 #endif
342
343 .macro RESTORE_SP
344 LONG_L sp, PT_R29(sp)
345 .endm
346
347 .macro RESTORE_ALL
348 RESTORE_TEMP
349 RESTORE_STATIC
350 RESTORE_AT
351 RESTORE_SOME
352 RESTORE_SP
353 .endm
354
355 .macro RESTORE_ALL_AND_RET
356 RESTORE_TEMP
357 RESTORE_STATIC
358 RESTORE_AT
359 RESTORE_SOME
360 RESTORE_SP_AND_RET
361 .endm
362
363 /*
364 * Move to kernel mode and disable interrupts.
365 * Set cp0 enable bit as sign that we're running on the kernel stack
366 */
367 .macro CLI
368 #if !defined(CONFIG_MIPS_MT_SMTC)
369 mfc0 t0, CP0_STATUS
370 li t1, ST0_CU0 | 0x1f
371 or t0, t1
372 xori t0, 0x1f
373 mtc0 t0, CP0_STATUS
374 #else /* CONFIG_MIPS_MT_SMTC */
375 /*
376 * For SMTC, we need to set privilege
377 * and disable interrupts only for the
378 * current TC, using the TCStatus register.
379 */
380 mfc0 t0,CP0_TCSTATUS
381 /* Fortunately CU 0 is in the same place in both registers */
382 /* Set TCU0, TMX, TKSU (for later inversion) and IXMT */
383 li t1, ST0_CU0 | 0x08001c00
384 or t0,t1
385 /* Clear TKSU, leave IXMT */
386 xori t0, 0x00001800
387 mtc0 t0, CP0_TCSTATUS
388 _ehb
389 /* We need to leave the global IE bit set, but clear EXL...*/
390 mfc0 t0, CP0_STATUS
391 ori t0, ST0_EXL | ST0_ERL
392 xori t0, ST0_EXL | ST0_ERL
393 mtc0 t0, CP0_STATUS
394 #endif /* CONFIG_MIPS_MT_SMTC */
395 irq_disable_hazard
396 .endm
397
398 /*
399 * Move to kernel mode and enable interrupts.
400 * Set cp0 enable bit as sign that we're running on the kernel stack
401 */
402 .macro STI
403 #if !defined(CONFIG_MIPS_MT_SMTC)
404 mfc0 t0, CP0_STATUS
405 li t1, ST0_CU0 | 0x1f
406 or t0, t1
407 xori t0, 0x1e
408 mtc0 t0, CP0_STATUS
409 #else /* CONFIG_MIPS_MT_SMTC */
410 /*
411 * For SMTC, we need to set privilege
412 * and enable interrupts only for the
413 * current TC, using the TCStatus register.
414 */
415 _ehb
416 mfc0 t0,CP0_TCSTATUS
417 /* Fortunately CU 0 is in the same place in both registers */
418 /* Set TCU0, TKSU (for later inversion) and IXMT */
419 li t1, ST0_CU0 | 0x08001c00
420 or t0,t1
421 /* Clear TKSU *and* IXMT */
422 xori t0, 0x00001c00
423 mtc0 t0, CP0_TCSTATUS
424 _ehb
425 /* We need to leave the global IE bit set, but clear EXL...*/
426 mfc0 t0, CP0_STATUS
427 ori t0, ST0_EXL
428 xori t0, ST0_EXL
429 mtc0 t0, CP0_STATUS
430 /* irq_enable_hazard below should expand to EHB for 24K/34K cpus */
431 #endif /* CONFIG_MIPS_MT_SMTC */
432 irq_enable_hazard
433 .endm
434
435 /*
436 * Just move to kernel mode and leave interrupts as they are.
437 * Set cp0 enable bit as sign that we're running on the kernel stack
438 */
439 .macro KMODE
440 #ifdef CONFIG_MIPS_MT_SMTC
441 /*
442 * This gets baroque in SMTC. We want to
443 * protect the non-atomic clearing of EXL
444 * with DMT/EMT, but we don't want to take
445 * an interrupt while DMT is still in effect.
446 */
447
448 /* KMODE gets invoked from both reorder and noreorder code */
449 .set push
450 .set mips32r2
451 .set noreorder
452 mfc0 v0, CP0_TCSTATUS
453 andi v1, v0, TCSTATUS_IXMT
454 ori v0, TCSTATUS_IXMT
455 mtc0 v0, CP0_TCSTATUS
456 _ehb
457 DMT 2 # dmt v0
458 /*
459 * We don't know a priori if ra is "live"
460 */
461 move t0, ra
462 jal mips_ihb
463 nop /* delay slot */
464 move ra, t0
465 #endif /* CONFIG_MIPS_MT_SMTC */
466 mfc0 t0, CP0_STATUS
467 li t1, ST0_CU0 | 0x1e
468 or t0, t1
469 xori t0, 0x1e
470 mtc0 t0, CP0_STATUS
471 #ifdef CONFIG_MIPS_MT_SMTC
472 _ehb
473 andi v0, v0, VPECONTROL_TE
474 beqz v0, 2f
475 nop /* delay slot */
476 emt
477 2:
478 mfc0 v0, CP0_TCSTATUS
479 /* Clear IXMT, then OR in previous value */
480 ori v0, TCSTATUS_IXMT
481 xori v0, TCSTATUS_IXMT
482 or v0, v1, v0
483 mtc0 v0, CP0_TCSTATUS
484 /*
485 * irq_disable_hazard below should expand to EHB
486 * on 24K/34K CPUS
487 */
488 .set pop
489 #endif /* CONFIG_MIPS_MT_SMTC */
490 irq_disable_hazard
491 .endm
492
493 #endif /* _ASM_STACKFRAME_H */
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