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
6 * Copyright (C) 1994, 1995, 1996, 1998, 1999, 2002, 2003 Ralf Baechle
7 * Copyright (C) 1996 David S. Miller (davem@davemloft.net)
8 * Copyright (C) 1994, 1995, 1996, by Andreas Busse
9 * Copyright (C) 1999 Silicon Graphics, Inc.
10 * Copyright (C) 2000 MIPS Technologies, Inc.
11 * written by Carsten Langgaard, carstenl@mips.com
14 #include <asm/cachectl.h>
15 #include <asm/fpregdef.h>
16 #include <asm/mipsregs.h>
17 #include <asm/asm-offsets.h>
18 #include <asm/pgtable-bits.h>
19 #include <asm/regdef.h>
20 #include <asm/stackframe.h>
21 #include <asm/thread_info.h>
23 #include <asm/asmmacro.h>
26 * Offset to the current process status flags, the first 32 bytes of the
29 #define ST_OFF (_THREAD_SIZE - 32 - PT_SIZE + PT_STATUS)
32 * task_struct *resume(task_struct *prev, task_struct *next,
33 * struct thread_info *next_ti, int usedfpu)
39 LONG_S t1, THREAD_STATUS(a0)
40 cpu_save_nonscratch a0
41 LONG_S ra, THREAD_REG31(a0)
43 #if CONFIG_CAVIUM_OCTEON_CVMSEG_SIZE > 0
44 /* Check if we need to store CVMSEG state */
45 mfc0 t0, $11,7 /* CvmMemCtl */
46 bbit0 t0, 6, 3f /* Is user access enabled? */
48 /* Store the CVMSEG state */
49 /* Extract the size of CVMSEG */
51 /* Multiply * (cache line size/sizeof(long)/2) */
53 li t1, -32768 /* Base address of CVMSEG */
54 LONG_ADDI t2, a0, THREAD_CVMSEG /* Where to store CVMSEG to */
58 LONG_L t8, 0(t1) /* Load from CVMSEG */
59 subu t0, 1 /* Decrement loop var */
60 LONG_L t9, LONGSIZE(t1)/* Load from CVMSEG */
61 LONG_ADDU t1, LONGSIZE*2 /* Increment loc in CVMSEG */
62 LONG_S t8, 0(t2) /* Store CVMSEG to thread storage */
63 LONG_ADDU t2, LONGSIZE*2 /* Increment loc in thread storage */
64 bnez t0, 2b /* Loop until we've copied it all */
65 LONG_S t9, -LONGSIZE(t2)/* Store CVMSEG to thread storage */
68 /* Disable access to CVMSEG */
69 mfc0 t0, $11,7 /* CvmMemCtl */
70 xori t0, t0, 0x40 /* Bit 6 is CVMSEG user enable */
71 mtc0 t0, $11,7 /* CvmMemCtl */
75 #if defined(CONFIG_CC_STACKPROTECTOR) && !defined(CONFIG_SMP)
76 PTR_LA t8, __stack_chk_guard
77 LONG_L t9, TASK_STACK_CANARY(a1)
82 * The order of restoring the registers takes care of the race
83 * updating $28, $29 and kernelsp without disabling ints.
86 cpu_restore_nonscratch a1
88 #if (_THREAD_SIZE - 32) < 0x8000
89 PTR_ADDIU t0, $28, _THREAD_SIZE - 32
91 PTR_LI t0, _THREAD_SIZE - 32
94 set_saved_sp t0, t1, t2
96 mfc0 t1, CP0_STATUS /* Do we really need this? */
99 LONG_L a2, THREAD_STATUS(a1)
109 * void octeon_cop2_save(struct octeon_cop2_state *a0)
112 LEAF(octeon_cop2_save)
114 dmfc0 t9, $9,7 /* CvmCtl register. */
116 /* Save the COP2 CRC state */
120 sd t0, OCTEON_CP2_CRC_IV(a0)
121 sd t1, OCTEON_CP2_CRC_LENGTH(a0)
122 sd t2, OCTEON_CP2_CRC_POLY(a0)
123 /* Skip next instructions if CvmCtl[NODFA_CP2] set */
126 /* Save the LLM state */
129 sd t0, OCTEON_CP2_LLM_DAT(a0)
130 sd t1, OCTEON_CP2_LLM_DAT+8(a0)
132 1: bbit1 t9, 26, 3f /* done if CvmCtl[NOCRYPTO] set */
134 /* Save the COP2 crypto state */
135 /* this part is mostly common to both pass 1 and later revisions */
140 sd t0, OCTEON_CP2_3DES_IV(a0)
142 sd t1, OCTEON_CP2_3DES_KEY(a0)
143 dmfc2 t1, 0x0111 /* only necessary for pass 1 */
144 sd t2, OCTEON_CP2_3DES_KEY+8(a0)
146 sd t3, OCTEON_CP2_3DES_KEY+16(a0)
148 sd t0, OCTEON_CP2_3DES_RESULT(a0)
150 sd t1, OCTEON_CP2_AES_INP0(a0) /* only necessary for pass 1 */
152 sd t2, OCTEON_CP2_AES_IV(a0)
154 sd t3, OCTEON_CP2_AES_IV+8(a0)
156 sd t0, OCTEON_CP2_AES_KEY(a0)
158 sd t1, OCTEON_CP2_AES_KEY+8(a0)
160 sd t2, OCTEON_CP2_AES_KEY+16(a0)
162 sd t3, OCTEON_CP2_AES_KEY+24(a0)
163 mfc0 t3, $15,0 /* Get the processor ID register */
164 sd t0, OCTEON_CP2_AES_KEYLEN(a0)
165 li t0, 0x000d0000 /* This is the processor ID of Octeon Pass1 */
166 sd t1, OCTEON_CP2_AES_RESULT(a0)
167 sd t2, OCTEON_CP2_AES_RESULT+8(a0)
168 /* Skip to the Pass1 version of the remainder of the COP2 state */
171 /* the non-pass1 state when !CvmCtl[NOCRYPTO] */
176 sd t1, OCTEON_CP2_HSH_DATW(a0)
178 sd t2, OCTEON_CP2_HSH_DATW+8(a0)
180 sd t3, OCTEON_CP2_HSH_DATW+16(a0)
182 sd t0, OCTEON_CP2_HSH_DATW+24(a0)
184 sd t1, OCTEON_CP2_HSH_DATW+32(a0)
186 sd t2, OCTEON_CP2_HSH_DATW+40(a0)
188 sd t3, OCTEON_CP2_HSH_DATW+48(a0)
190 sd t0, OCTEON_CP2_HSH_DATW+56(a0)
192 sd t1, OCTEON_CP2_HSH_DATW+64(a0)
194 sd t2, OCTEON_CP2_HSH_DATW+72(a0)
196 sd t3, OCTEON_CP2_HSH_DATW+80(a0)
198 sd t0, OCTEON_CP2_HSH_DATW+88(a0)
200 sd t1, OCTEON_CP2_HSH_DATW+96(a0)
202 sd t2, OCTEON_CP2_HSH_DATW+104(a0)
204 sd t3, OCTEON_CP2_HSH_DATW+112(a0)
206 sd t0, OCTEON_CP2_HSH_IVW(a0)
208 sd t1, OCTEON_CP2_HSH_IVW+8(a0)
210 sd t2, OCTEON_CP2_HSH_IVW+16(a0)
212 sd t3, OCTEON_CP2_HSH_IVW+24(a0)
214 sd t0, OCTEON_CP2_HSH_IVW+32(a0)
216 sd t1, OCTEON_CP2_HSH_IVW+40(a0)
218 sd t2, OCTEON_CP2_HSH_IVW+48(a0)
220 sd t3, OCTEON_CP2_HSH_IVW+56(a0)
222 sd t0, OCTEON_CP2_GFM_MULT(a0)
224 sd t1, OCTEON_CP2_GFM_MULT+8(a0)
225 sd t2, OCTEON_CP2_GFM_POLY(a0)
226 sd t3, OCTEON_CP2_GFM_RESULT(a0)
227 sd t0, OCTEON_CP2_GFM_RESULT+8(a0)
230 2: /* pass 1 special stuff when !CvmCtl[NOCRYPTO] */
235 sd t3, OCTEON_CP2_HSH_DATW(a0)
237 sd t0, OCTEON_CP2_HSH_DATW+8(a0)
239 sd t1, OCTEON_CP2_HSH_DATW+16(a0)
241 sd t2, OCTEON_CP2_HSH_DATW+24(a0)
243 sd t3, OCTEON_CP2_HSH_DATW+32(a0)
245 sd t0, OCTEON_CP2_HSH_DATW+40(a0)
247 sd t1, OCTEON_CP2_HSH_DATW+48(a0)
248 sd t2, OCTEON_CP2_HSH_IVW(a0)
249 sd t3, OCTEON_CP2_HSH_IVW+8(a0)
250 sd t0, OCTEON_CP2_HSH_IVW+16(a0)
252 3: /* pass 1 or CvmCtl[NOCRYPTO] set */
254 END(octeon_cop2_save)
257 * void octeon_cop2_restore(struct octeon_cop2_state *a0)
262 LEAF(octeon_cop2_restore)
263 /* First cache line was prefetched before the call */
265 dmfc0 t9, $9,7 /* CvmCtl register. */
268 ld t0, OCTEON_CP2_CRC_IV(a0)
270 ld t1, OCTEON_CP2_CRC_LENGTH(a0)
271 ld t2, OCTEON_CP2_CRC_POLY(a0)
273 /* Restore the COP2 CRC state */
276 bbit1 t9, 28, 2f /* Skip LLM if CvmCtl[NODFA_CP2] is set */
279 /* Restore the LLM state */
280 ld t0, OCTEON_CP2_LLM_DAT(a0)
281 ld t1, OCTEON_CP2_LLM_DAT+8(a0)
286 bbit1 t9, 26, done_restore /* done if CvmCtl[NOCRYPTO] set */
289 /* Restore the COP2 crypto state common to pass 1 and pass 2 */
290 ld t0, OCTEON_CP2_3DES_IV(a0)
291 ld t1, OCTEON_CP2_3DES_KEY(a0)
292 ld t2, OCTEON_CP2_3DES_KEY+8(a0)
294 ld t0, OCTEON_CP2_3DES_KEY+16(a0)
296 ld t1, OCTEON_CP2_3DES_RESULT(a0)
298 ld t2, OCTEON_CP2_AES_INP0(a0) /* only really needed for pass 1 */
300 ld t0, OCTEON_CP2_AES_IV(a0)
302 ld t1, OCTEON_CP2_AES_IV+8(a0)
303 dmtc2 t2, 0x010A /* only really needed for pass 1 */
304 ld t2, OCTEON_CP2_AES_KEY(a0)
306 ld t0, OCTEON_CP2_AES_KEY+8(a0)
308 ld t1, OCTEON_CP2_AES_KEY+16(a0)
310 ld t2, OCTEON_CP2_AES_KEY+24(a0)
312 ld t0, OCTEON_CP2_AES_KEYLEN(a0)
314 ld t1, OCTEON_CP2_AES_RESULT(a0)
316 ld t2, OCTEON_CP2_AES_RESULT+8(a0)
317 mfc0 t3, $15,0 /* Get the processor ID register */
319 li t0, 0x000d0000 /* This is the processor ID of Octeon Pass1 */
321 bne t0, t3, 3f /* Skip the next stuff for non-pass1 */
324 /* this code is specific for pass 1 */
325 ld t0, OCTEON_CP2_HSH_DATW(a0)
326 ld t1, OCTEON_CP2_HSH_DATW+8(a0)
327 ld t2, OCTEON_CP2_HSH_DATW+16(a0)
329 ld t0, OCTEON_CP2_HSH_DATW+24(a0)
331 ld t1, OCTEON_CP2_HSH_DATW+32(a0)
333 ld t2, OCTEON_CP2_HSH_DATW+40(a0)
335 ld t0, OCTEON_CP2_HSH_DATW+48(a0)
337 ld t1, OCTEON_CP2_HSH_IVW(a0)
339 ld t2, OCTEON_CP2_HSH_IVW+8(a0)
341 ld t0, OCTEON_CP2_HSH_IVW+16(a0)
344 b done_restore /* unconditional branch */
347 3: /* this is post-pass1 code */
348 ld t2, OCTEON_CP2_HSH_DATW(a0)
349 ld t0, OCTEON_CP2_HSH_DATW+8(a0)
350 ld t1, OCTEON_CP2_HSH_DATW+16(a0)
352 ld t2, OCTEON_CP2_HSH_DATW+24(a0)
354 ld t0, OCTEON_CP2_HSH_DATW+32(a0)
356 ld t1, OCTEON_CP2_HSH_DATW+40(a0)
358 ld t2, OCTEON_CP2_HSH_DATW+48(a0)
360 ld t0, OCTEON_CP2_HSH_DATW+56(a0)
362 ld t1, OCTEON_CP2_HSH_DATW+64(a0)
364 ld t2, OCTEON_CP2_HSH_DATW+72(a0)
366 ld t0, OCTEON_CP2_HSH_DATW+80(a0)
368 ld t1, OCTEON_CP2_HSH_DATW+88(a0)
370 ld t2, OCTEON_CP2_HSH_DATW+96(a0)
372 ld t0, OCTEON_CP2_HSH_DATW+104(a0)
374 ld t1, OCTEON_CP2_HSH_DATW+112(a0)
376 ld t2, OCTEON_CP2_HSH_IVW(a0)
378 ld t0, OCTEON_CP2_HSH_IVW+8(a0)
380 ld t1, OCTEON_CP2_HSH_IVW+16(a0)
382 ld t2, OCTEON_CP2_HSH_IVW+24(a0)
384 ld t0, OCTEON_CP2_HSH_IVW+32(a0)
386 ld t1, OCTEON_CP2_HSH_IVW+40(a0)
388 ld t2, OCTEON_CP2_HSH_IVW+48(a0)
390 ld t0, OCTEON_CP2_HSH_IVW+56(a0)
392 ld t1, OCTEON_CP2_GFM_MULT(a0)
394 ld t2, OCTEON_CP2_GFM_MULT+8(a0)
396 ld t0, OCTEON_CP2_GFM_POLY(a0)
398 ld t1, OCTEON_CP2_GFM_RESULT(a0)
400 ld t2, OCTEON_CP2_GFM_RESULT+8(a0)
408 END(octeon_cop2_restore)
412 * void octeon_mult_save()
413 * sp is assumed to point to a struct pt_regs
415 * NOTE: This is called in SAVE_SOME in stackframe.h. It can only
416 * safely modify k0 and k1.
421 LEAF(octeon_mult_save)
422 dmfc0 k0, $9,7 /* CvmCtl register. */
423 bbit1 k0, 27, 1f /* Skip CvmCtl[NOMUL] */
426 /* Save the multiplier state */
429 sd k0, PT_MTP(sp) /* PT_MTP has P0 */
431 sd k1, PT_MTP+8(sp) /* PT_MTP+8 has P1 */
434 sd k0, PT_MTP+16(sp) /* PT_MTP+16 has P2 */
436 sd k1, PT_MPL(sp) /* PT_MPL has MPL0 */
438 sd k0, PT_MPL+8(sp) /* PT_MPL+8 has MPL1 */
440 sd k1, PT_MPL+16(sp) /* PT_MPL+16 has MPL2 */
442 1: /* Resume here if CvmCtl[NOMUL] */
444 END(octeon_mult_save)
448 * void octeon_mult_restore()
449 * sp is assumed to point to a struct pt_regs
451 * NOTE: This is called in RESTORE_SOME in stackframe.h.
456 LEAF(octeon_mult_restore)
457 dmfc0 k1, $9,7 /* CvmCtl register. */
458 ld v0, PT_MPL(sp) /* MPL0 */
459 ld v1, PT_MPL+8(sp) /* MPL1 */
460 ld k0, PT_MPL+16(sp) /* MPL2 */
461 bbit1 k1, 27, 1f /* Skip CvmCtl[NOMUL] */
462 /* Normally falls through, so no time wasted here */
465 /* Restore the multiplier state */
466 ld k1, PT_MTP+16(sp) /* P2 */
468 ld v0, PT_MTP+8(sp) /* P1 */
470 ld v1, PT_MTP(sp) /* P0 */
477 1: /* Resume here if CvmCtl[NOMUL] */
480 END(octeon_mult_restore)