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1da177e4 LT |
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 | * Synthesize TLB refill handlers at runtime. | |
7 | * | |
e30ec452 | 8 | * Copyright (C) 2004, 2005, 2006, 2008 Thiemo Seufer |
95affdda | 9 | * Copyright (C) 2005, 2007, 2008, 2009 Maciej W. Rozycki |
41c594ab | 10 | * Copyright (C) 2006 Ralf Baechle (ralf@linux-mips.org) |
fd062c84 | 11 | * Copyright (C) 2008, 2009 Cavium Networks, Inc. |
41c594ab RB |
12 | * |
13 | * ... and the days got worse and worse and now you see | |
14 | * I've gone completly out of my mind. | |
15 | * | |
16 | * They're coming to take me a away haha | |
17 | * they're coming to take me a away hoho hihi haha | |
18 | * to the funny farm where code is beautiful all the time ... | |
19 | * | |
20 | * (Condolences to Napoleon XIV) | |
1da177e4 LT |
21 | */ |
22 | ||
95affdda | 23 | #include <linux/bug.h> |
1da177e4 LT |
24 | #include <linux/kernel.h> |
25 | #include <linux/types.h> | |
631330f5 | 26 | #include <linux/smp.h> |
1da177e4 LT |
27 | #include <linux/string.h> |
28 | #include <linux/init.h> | |
29 | ||
1da177e4 | 30 | #include <asm/mmu_context.h> |
1da177e4 LT |
31 | #include <asm/war.h> |
32 | ||
e30ec452 TS |
33 | #include "uasm.h" |
34 | ||
aeffdbba | 35 | static inline int r45k_bvahwbug(void) |
1da177e4 LT |
36 | { |
37 | /* XXX: We should probe for the presence of this bug, but we don't. */ | |
38 | return 0; | |
39 | } | |
40 | ||
aeffdbba | 41 | static inline int r4k_250MHZhwbug(void) |
1da177e4 LT |
42 | { |
43 | /* XXX: We should probe for the presence of this bug, but we don't. */ | |
44 | return 0; | |
45 | } | |
46 | ||
aeffdbba | 47 | static inline int __maybe_unused bcm1250_m3_war(void) |
1da177e4 LT |
48 | { |
49 | return BCM1250_M3_WAR; | |
50 | } | |
51 | ||
aeffdbba | 52 | static inline int __maybe_unused r10000_llsc_war(void) |
1da177e4 LT |
53 | { |
54 | return R10000_LLSC_WAR; | |
55 | } | |
56 | ||
8df5beac MR |
57 | /* |
58 | * Found by experiment: At least some revisions of the 4kc throw under | |
59 | * some circumstances a machine check exception, triggered by invalid | |
60 | * values in the index register. Delaying the tlbp instruction until | |
61 | * after the next branch, plus adding an additional nop in front of | |
62 | * tlbwi/tlbwr avoids the invalid index register values. Nobody knows | |
63 | * why; it's not an issue caused by the core RTL. | |
64 | * | |
65 | */ | |
234fcd14 | 66 | static int __cpuinit m4kc_tlbp_war(void) |
8df5beac MR |
67 | { |
68 | return (current_cpu_data.processor_id & 0xffff00) == | |
69 | (PRID_COMP_MIPS | PRID_IMP_4KC); | |
70 | } | |
71 | ||
e30ec452 | 72 | /* Handle labels (which must be positive integers). */ |
1da177e4 | 73 | enum label_id { |
e30ec452 | 74 | label_second_part = 1, |
1da177e4 LT |
75 | label_leave, |
76 | label_vmalloc, | |
77 | label_vmalloc_done, | |
78 | label_tlbw_hazard, | |
79 | label_split, | |
80 | label_nopage_tlbl, | |
81 | label_nopage_tlbs, | |
82 | label_nopage_tlbm, | |
83 | label_smp_pgtable_change, | |
84 | label_r3000_write_probe_fail, | |
fd062c84 DD |
85 | #ifdef CONFIG_HUGETLB_PAGE |
86 | label_tlb_huge_update, | |
87 | #endif | |
1da177e4 LT |
88 | }; |
89 | ||
e30ec452 TS |
90 | UASM_L_LA(_second_part) |
91 | UASM_L_LA(_leave) | |
e30ec452 TS |
92 | UASM_L_LA(_vmalloc) |
93 | UASM_L_LA(_vmalloc_done) | |
94 | UASM_L_LA(_tlbw_hazard) | |
95 | UASM_L_LA(_split) | |
96 | UASM_L_LA(_nopage_tlbl) | |
97 | UASM_L_LA(_nopage_tlbs) | |
98 | UASM_L_LA(_nopage_tlbm) | |
99 | UASM_L_LA(_smp_pgtable_change) | |
100 | UASM_L_LA(_r3000_write_probe_fail) | |
fd062c84 DD |
101 | #ifdef CONFIG_HUGETLB_PAGE |
102 | UASM_L_LA(_tlb_huge_update) | |
103 | #endif | |
656be92f | 104 | |
92b1e6a6 FBH |
105 | /* |
106 | * For debug purposes. | |
107 | */ | |
108 | static inline void dump_handler(const u32 *handler, int count) | |
109 | { | |
110 | int i; | |
111 | ||
112 | pr_debug("\t.set push\n"); | |
113 | pr_debug("\t.set noreorder\n"); | |
114 | ||
115 | for (i = 0; i < count; i++) | |
116 | pr_debug("\t%p\t.word 0x%08x\n", &handler[i], handler[i]); | |
117 | ||
118 | pr_debug("\t.set pop\n"); | |
119 | } | |
120 | ||
1da177e4 LT |
121 | /* The only general purpose registers allowed in TLB handlers. */ |
122 | #define K0 26 | |
123 | #define K1 27 | |
124 | ||
125 | /* Some CP0 registers */ | |
41c594ab RB |
126 | #define C0_INDEX 0, 0 |
127 | #define C0_ENTRYLO0 2, 0 | |
128 | #define C0_TCBIND 2, 2 | |
129 | #define C0_ENTRYLO1 3, 0 | |
130 | #define C0_CONTEXT 4, 0 | |
fd062c84 | 131 | #define C0_PAGEMASK 5, 0 |
41c594ab RB |
132 | #define C0_BADVADDR 8, 0 |
133 | #define C0_ENTRYHI 10, 0 | |
134 | #define C0_EPC 14, 0 | |
135 | #define C0_XCONTEXT 20, 0 | |
1da177e4 | 136 | |
875d43e7 | 137 | #ifdef CONFIG_64BIT |
e30ec452 | 138 | # define GET_CONTEXT(buf, reg) UASM_i_MFC0(buf, reg, C0_XCONTEXT) |
1da177e4 | 139 | #else |
e30ec452 | 140 | # define GET_CONTEXT(buf, reg) UASM_i_MFC0(buf, reg, C0_CONTEXT) |
1da177e4 LT |
141 | #endif |
142 | ||
143 | /* The worst case length of the handler is around 18 instructions for | |
144 | * R3000-style TLBs and up to 63 instructions for R4000-style TLBs. | |
145 | * Maximum space available is 32 instructions for R3000 and 64 | |
146 | * instructions for R4000. | |
147 | * | |
148 | * We deliberately chose a buffer size of 128, so we won't scribble | |
149 | * over anything important on overflow before we panic. | |
150 | */ | |
234fcd14 | 151 | static u32 tlb_handler[128] __cpuinitdata; |
1da177e4 LT |
152 | |
153 | /* simply assume worst case size for labels and relocs */ | |
234fcd14 RB |
154 | static struct uasm_label labels[128] __cpuinitdata; |
155 | static struct uasm_reloc relocs[128] __cpuinitdata; | |
1da177e4 | 156 | |
82622284 DD |
157 | #ifndef CONFIG_MIPS_PGD_C0_CONTEXT |
158 | /* | |
159 | * CONFIG_MIPS_PGD_C0_CONTEXT implies 64 bit and lack of pgd_current, | |
160 | * we cannot do r3000 under these circumstances. | |
161 | */ | |
162 | ||
1da177e4 LT |
163 | /* |
164 | * The R3000 TLB handler is simple. | |
165 | */ | |
234fcd14 | 166 | static void __cpuinit build_r3000_tlb_refill_handler(void) |
1da177e4 LT |
167 | { |
168 | long pgdc = (long)pgd_current; | |
169 | u32 *p; | |
170 | ||
171 | memset(tlb_handler, 0, sizeof(tlb_handler)); | |
172 | p = tlb_handler; | |
173 | ||
e30ec452 TS |
174 | uasm_i_mfc0(&p, K0, C0_BADVADDR); |
175 | uasm_i_lui(&p, K1, uasm_rel_hi(pgdc)); /* cp0 delay */ | |
176 | uasm_i_lw(&p, K1, uasm_rel_lo(pgdc), K1); | |
177 | uasm_i_srl(&p, K0, K0, 22); /* load delay */ | |
178 | uasm_i_sll(&p, K0, K0, 2); | |
179 | uasm_i_addu(&p, K1, K1, K0); | |
180 | uasm_i_mfc0(&p, K0, C0_CONTEXT); | |
181 | uasm_i_lw(&p, K1, 0, K1); /* cp0 delay */ | |
182 | uasm_i_andi(&p, K0, K0, 0xffc); /* load delay */ | |
183 | uasm_i_addu(&p, K1, K1, K0); | |
184 | uasm_i_lw(&p, K0, 0, K1); | |
185 | uasm_i_nop(&p); /* load delay */ | |
186 | uasm_i_mtc0(&p, K0, C0_ENTRYLO0); | |
187 | uasm_i_mfc0(&p, K1, C0_EPC); /* cp0 delay */ | |
188 | uasm_i_tlbwr(&p); /* cp0 delay */ | |
189 | uasm_i_jr(&p, K1); | |
190 | uasm_i_rfe(&p); /* branch delay */ | |
1da177e4 LT |
191 | |
192 | if (p > tlb_handler + 32) | |
193 | panic("TLB refill handler space exceeded"); | |
194 | ||
e30ec452 TS |
195 | pr_debug("Wrote TLB refill handler (%u instructions).\n", |
196 | (unsigned int)(p - tlb_handler)); | |
1da177e4 | 197 | |
91b05e67 | 198 | memcpy((void *)ebase, tlb_handler, 0x80); |
92b1e6a6 FBH |
199 | |
200 | dump_handler((u32 *)ebase, 32); | |
1da177e4 | 201 | } |
82622284 | 202 | #endif /* CONFIG_MIPS_PGD_C0_CONTEXT */ |
1da177e4 LT |
203 | |
204 | /* | |
205 | * The R4000 TLB handler is much more complicated. We have two | |
206 | * consecutive handler areas with 32 instructions space each. | |
207 | * Since they aren't used at the same time, we can overflow in the | |
208 | * other one.To keep things simple, we first assume linear space, | |
209 | * then we relocate it to the final handler layout as needed. | |
210 | */ | |
234fcd14 | 211 | static u32 final_handler[64] __cpuinitdata; |
1da177e4 LT |
212 | |
213 | /* | |
214 | * Hazards | |
215 | * | |
216 | * From the IDT errata for the QED RM5230 (Nevada), processor revision 1.0: | |
217 | * 2. A timing hazard exists for the TLBP instruction. | |
218 | * | |
219 | * stalling_instruction | |
220 | * TLBP | |
221 | * | |
222 | * The JTLB is being read for the TLBP throughout the stall generated by the | |
223 | * previous instruction. This is not really correct as the stalling instruction | |
224 | * can modify the address used to access the JTLB. The failure symptom is that | |
225 | * the TLBP instruction will use an address created for the stalling instruction | |
226 | * and not the address held in C0_ENHI and thus report the wrong results. | |
227 | * | |
228 | * The software work-around is to not allow the instruction preceding the TLBP | |
229 | * to stall - make it an NOP or some other instruction guaranteed not to stall. | |
230 | * | |
231 | * Errata 2 will not be fixed. This errata is also on the R5000. | |
232 | * | |
233 | * As if we MIPS hackers wouldn't know how to nop pipelines happy ... | |
234 | */ | |
234fcd14 | 235 | static void __cpuinit __maybe_unused build_tlb_probe_entry(u32 **p) |
1da177e4 | 236 | { |
10cc3529 | 237 | switch (current_cpu_type()) { |
326e2e1a | 238 | /* Found by experiment: R4600 v2.0/R4700 needs this, too. */ |
f5b4d956 | 239 | case CPU_R4600: |
326e2e1a | 240 | case CPU_R4700: |
1da177e4 LT |
241 | case CPU_R5000: |
242 | case CPU_R5000A: | |
243 | case CPU_NEVADA: | |
e30ec452 TS |
244 | uasm_i_nop(p); |
245 | uasm_i_tlbp(p); | |
1da177e4 LT |
246 | break; |
247 | ||
248 | default: | |
e30ec452 | 249 | uasm_i_tlbp(p); |
1da177e4 LT |
250 | break; |
251 | } | |
252 | } | |
253 | ||
254 | /* | |
255 | * Write random or indexed TLB entry, and care about the hazards from | |
256 | * the preceeding mtc0 and for the following eret. | |
257 | */ | |
258 | enum tlb_write_entry { tlb_random, tlb_indexed }; | |
259 | ||
234fcd14 | 260 | static void __cpuinit build_tlb_write_entry(u32 **p, struct uasm_label **l, |
e30ec452 | 261 | struct uasm_reloc **r, |
1da177e4 LT |
262 | enum tlb_write_entry wmode) |
263 | { | |
264 | void(*tlbw)(u32 **) = NULL; | |
265 | ||
266 | switch (wmode) { | |
e30ec452 TS |
267 | case tlb_random: tlbw = uasm_i_tlbwr; break; |
268 | case tlb_indexed: tlbw = uasm_i_tlbwi; break; | |
1da177e4 LT |
269 | } |
270 | ||
161548bf | 271 | if (cpu_has_mips_r2) { |
41f0e4d0 DD |
272 | if (cpu_has_mips_r2_exec_hazard) |
273 | uasm_i_ehb(p); | |
161548bf RB |
274 | tlbw(p); |
275 | return; | |
276 | } | |
277 | ||
10cc3529 | 278 | switch (current_cpu_type()) { |
1da177e4 LT |
279 | case CPU_R4000PC: |
280 | case CPU_R4000SC: | |
281 | case CPU_R4000MC: | |
282 | case CPU_R4400PC: | |
283 | case CPU_R4400SC: | |
284 | case CPU_R4400MC: | |
285 | /* | |
286 | * This branch uses up a mtc0 hazard nop slot and saves | |
287 | * two nops after the tlbw instruction. | |
288 | */ | |
e30ec452 | 289 | uasm_il_bgezl(p, r, 0, label_tlbw_hazard); |
1da177e4 | 290 | tlbw(p); |
e30ec452 TS |
291 | uasm_l_tlbw_hazard(l, *p); |
292 | uasm_i_nop(p); | |
1da177e4 LT |
293 | break; |
294 | ||
295 | case CPU_R4600: | |
296 | case CPU_R4700: | |
297 | case CPU_R5000: | |
298 | case CPU_R5000A: | |
e30ec452 | 299 | uasm_i_nop(p); |
2c93e12c | 300 | tlbw(p); |
e30ec452 | 301 | uasm_i_nop(p); |
2c93e12c MR |
302 | break; |
303 | ||
304 | case CPU_R4300: | |
1da177e4 LT |
305 | case CPU_5KC: |
306 | case CPU_TX49XX: | |
bdf21b18 | 307 | case CPU_PR4450: |
e30ec452 | 308 | uasm_i_nop(p); |
1da177e4 LT |
309 | tlbw(p); |
310 | break; | |
311 | ||
312 | case CPU_R10000: | |
313 | case CPU_R12000: | |
44d921b2 | 314 | case CPU_R14000: |
1da177e4 | 315 | case CPU_4KC: |
b1ec4c8e | 316 | case CPU_4KEC: |
1da177e4 | 317 | case CPU_SB1: |
93ce2f52 | 318 | case CPU_SB1A: |
1da177e4 LT |
319 | case CPU_4KSC: |
320 | case CPU_20KC: | |
321 | case CPU_25KF: | |
1c0c13eb AJ |
322 | case CPU_BCM3302: |
323 | case CPU_BCM4710: | |
2a21c730 | 324 | case CPU_LOONGSON2: |
0de663ef MB |
325 | case CPU_BCM6338: |
326 | case CPU_BCM6345: | |
327 | case CPU_BCM6348: | |
328 | case CPU_BCM6358: | |
a644b277 | 329 | case CPU_R5500: |
8df5beac | 330 | if (m4kc_tlbp_war()) |
e30ec452 | 331 | uasm_i_nop(p); |
2f794d09 | 332 | case CPU_ALCHEMY: |
1da177e4 LT |
333 | tlbw(p); |
334 | break; | |
335 | ||
336 | case CPU_NEVADA: | |
e30ec452 | 337 | uasm_i_nop(p); /* QED specifies 2 nops hazard */ |
1da177e4 LT |
338 | /* |
339 | * This branch uses up a mtc0 hazard nop slot and saves | |
340 | * a nop after the tlbw instruction. | |
341 | */ | |
e30ec452 | 342 | uasm_il_bgezl(p, r, 0, label_tlbw_hazard); |
1da177e4 | 343 | tlbw(p); |
e30ec452 | 344 | uasm_l_tlbw_hazard(l, *p); |
1da177e4 LT |
345 | break; |
346 | ||
347 | case CPU_RM7000: | |
e30ec452 TS |
348 | uasm_i_nop(p); |
349 | uasm_i_nop(p); | |
350 | uasm_i_nop(p); | |
351 | uasm_i_nop(p); | |
1da177e4 LT |
352 | tlbw(p); |
353 | break; | |
354 | ||
1da177e4 LT |
355 | case CPU_RM9000: |
356 | /* | |
357 | * When the JTLB is updated by tlbwi or tlbwr, a subsequent | |
358 | * use of the JTLB for instructions should not occur for 4 | |
359 | * cpu cycles and use for data translations should not occur | |
360 | * for 3 cpu cycles. | |
361 | */ | |
e30ec452 TS |
362 | uasm_i_ssnop(p); |
363 | uasm_i_ssnop(p); | |
364 | uasm_i_ssnop(p); | |
365 | uasm_i_ssnop(p); | |
1da177e4 | 366 | tlbw(p); |
e30ec452 TS |
367 | uasm_i_ssnop(p); |
368 | uasm_i_ssnop(p); | |
369 | uasm_i_ssnop(p); | |
370 | uasm_i_ssnop(p); | |
1da177e4 LT |
371 | break; |
372 | ||
373 | case CPU_VR4111: | |
374 | case CPU_VR4121: | |
375 | case CPU_VR4122: | |
376 | case CPU_VR4181: | |
377 | case CPU_VR4181A: | |
e30ec452 TS |
378 | uasm_i_nop(p); |
379 | uasm_i_nop(p); | |
1da177e4 | 380 | tlbw(p); |
e30ec452 TS |
381 | uasm_i_nop(p); |
382 | uasm_i_nop(p); | |
1da177e4 LT |
383 | break; |
384 | ||
385 | case CPU_VR4131: | |
386 | case CPU_VR4133: | |
7623debf | 387 | case CPU_R5432: |
e30ec452 TS |
388 | uasm_i_nop(p); |
389 | uasm_i_nop(p); | |
1da177e4 LT |
390 | tlbw(p); |
391 | break; | |
392 | ||
393 | default: | |
394 | panic("No TLB refill handler yet (CPU type: %d)", | |
395 | current_cpu_data.cputype); | |
396 | break; | |
397 | } | |
398 | } | |
399 | ||
fd062c84 DD |
400 | #ifdef CONFIG_HUGETLB_PAGE |
401 | static __cpuinit void build_huge_tlb_write_entry(u32 **p, | |
402 | struct uasm_label **l, | |
403 | struct uasm_reloc **r, | |
404 | unsigned int tmp, | |
405 | enum tlb_write_entry wmode) | |
406 | { | |
407 | /* Set huge page tlb entry size */ | |
408 | uasm_i_lui(p, tmp, PM_HUGE_MASK >> 16); | |
409 | uasm_i_ori(p, tmp, tmp, PM_HUGE_MASK & 0xffff); | |
410 | uasm_i_mtc0(p, tmp, C0_PAGEMASK); | |
411 | ||
412 | build_tlb_write_entry(p, l, r, wmode); | |
413 | ||
414 | /* Reset default page size */ | |
415 | if (PM_DEFAULT_MASK >> 16) { | |
416 | uasm_i_lui(p, tmp, PM_DEFAULT_MASK >> 16); | |
417 | uasm_i_ori(p, tmp, tmp, PM_DEFAULT_MASK & 0xffff); | |
418 | uasm_il_b(p, r, label_leave); | |
419 | uasm_i_mtc0(p, tmp, C0_PAGEMASK); | |
420 | } else if (PM_DEFAULT_MASK) { | |
421 | uasm_i_ori(p, tmp, 0, PM_DEFAULT_MASK); | |
422 | uasm_il_b(p, r, label_leave); | |
423 | uasm_i_mtc0(p, tmp, C0_PAGEMASK); | |
424 | } else { | |
425 | uasm_il_b(p, r, label_leave); | |
426 | uasm_i_mtc0(p, 0, C0_PAGEMASK); | |
427 | } | |
428 | } | |
429 | ||
430 | /* | |
431 | * Check if Huge PTE is present, if so then jump to LABEL. | |
432 | */ | |
433 | static void __cpuinit | |
434 | build_is_huge_pte(u32 **p, struct uasm_reloc **r, unsigned int tmp, | |
435 | unsigned int pmd, int lid) | |
436 | { | |
437 | UASM_i_LW(p, tmp, 0, pmd); | |
438 | uasm_i_andi(p, tmp, tmp, _PAGE_HUGE); | |
439 | uasm_il_bnez(p, r, tmp, lid); | |
440 | } | |
441 | ||
442 | static __cpuinit void build_huge_update_entries(u32 **p, | |
443 | unsigned int pte, | |
444 | unsigned int tmp) | |
445 | { | |
446 | int small_sequence; | |
447 | ||
448 | /* | |
449 | * A huge PTE describes an area the size of the | |
450 | * configured huge page size. This is twice the | |
451 | * of the large TLB entry size we intend to use. | |
452 | * A TLB entry half the size of the configured | |
453 | * huge page size is configured into entrylo0 | |
454 | * and entrylo1 to cover the contiguous huge PTE | |
455 | * address space. | |
456 | */ | |
457 | small_sequence = (HPAGE_SIZE >> 7) < 0x10000; | |
458 | ||
459 | /* We can clobber tmp. It isn't used after this.*/ | |
460 | if (!small_sequence) | |
461 | uasm_i_lui(p, tmp, HPAGE_SIZE >> (7 + 16)); | |
462 | ||
463 | UASM_i_SRL(p, pte, pte, 6); /* convert to entrylo */ | |
464 | uasm_i_mtc0(p, pte, C0_ENTRYLO0); /* load it */ | |
465 | /* convert to entrylo1 */ | |
466 | if (small_sequence) | |
467 | UASM_i_ADDIU(p, pte, pte, HPAGE_SIZE >> 7); | |
468 | else | |
469 | UASM_i_ADDU(p, pte, pte, tmp); | |
470 | ||
471 | uasm_i_mtc0(p, pte, C0_ENTRYLO1); /* load it */ | |
472 | } | |
473 | ||
474 | static __cpuinit void build_huge_handler_tail(u32 **p, | |
475 | struct uasm_reloc **r, | |
476 | struct uasm_label **l, | |
477 | unsigned int pte, | |
478 | unsigned int ptr) | |
479 | { | |
480 | #ifdef CONFIG_SMP | |
481 | UASM_i_SC(p, pte, 0, ptr); | |
482 | uasm_il_beqz(p, r, pte, label_tlb_huge_update); | |
483 | UASM_i_LW(p, pte, 0, ptr); /* Needed because SC killed our PTE */ | |
484 | #else | |
485 | UASM_i_SW(p, pte, 0, ptr); | |
486 | #endif | |
487 | build_huge_update_entries(p, pte, ptr); | |
488 | build_huge_tlb_write_entry(p, l, r, pte, tlb_indexed); | |
489 | } | |
490 | #endif /* CONFIG_HUGETLB_PAGE */ | |
491 | ||
875d43e7 | 492 | #ifdef CONFIG_64BIT |
1da177e4 LT |
493 | /* |
494 | * TMP and PTR are scratch. | |
495 | * TMP will be clobbered, PTR will hold the pmd entry. | |
496 | */ | |
234fcd14 | 497 | static void __cpuinit |
e30ec452 | 498 | build_get_pmde64(u32 **p, struct uasm_label **l, struct uasm_reloc **r, |
1da177e4 LT |
499 | unsigned int tmp, unsigned int ptr) |
500 | { | |
82622284 | 501 | #ifndef CONFIG_MIPS_PGD_C0_CONTEXT |
1da177e4 | 502 | long pgdc = (long)pgd_current; |
82622284 | 503 | #endif |
1da177e4 LT |
504 | /* |
505 | * The vmalloc handling is not in the hotpath. | |
506 | */ | |
e30ec452 | 507 | uasm_i_dmfc0(p, tmp, C0_BADVADDR); |
e30ec452 | 508 | uasm_il_bltz(p, r, tmp, label_vmalloc); |
e30ec452 | 509 | /* No uasm_i_nop needed here, since the next insn doesn't touch TMP. */ |
1da177e4 | 510 | |
82622284 DD |
511 | #ifdef CONFIG_MIPS_PGD_C0_CONTEXT |
512 | /* | |
513 | * &pgd << 11 stored in CONTEXT [23..63]. | |
514 | */ | |
515 | UASM_i_MFC0(p, ptr, C0_CONTEXT); | |
516 | uasm_i_dins(p, ptr, 0, 0, 23); /* Clear lower 23 bits of context. */ | |
517 | uasm_i_ori(p, ptr, ptr, 0x540); /* 1 0 1 0 1 << 6 xkphys cached */ | |
518 | uasm_i_drotr(p, ptr, ptr, 11); | |
519 | #elif defined(CONFIG_SMP) | |
41c594ab RB |
520 | # ifdef CONFIG_MIPS_MT_SMTC |
521 | /* | |
522 | * SMTC uses TCBind value as "CPU" index | |
523 | */ | |
e30ec452 TS |
524 | uasm_i_mfc0(p, ptr, C0_TCBIND); |
525 | uasm_i_dsrl(p, ptr, ptr, 19); | |
41c594ab | 526 | # else |
1da177e4 | 527 | /* |
1b3a6e97 | 528 | * 64 bit SMP running in XKPHYS has smp_processor_id() << 3 |
1da177e4 LT |
529 | * stored in CONTEXT. |
530 | */ | |
e30ec452 TS |
531 | uasm_i_dmfc0(p, ptr, C0_CONTEXT); |
532 | uasm_i_dsrl(p, ptr, ptr, 23); | |
82622284 | 533 | # endif |
e30ec452 TS |
534 | UASM_i_LA_mostly(p, tmp, pgdc); |
535 | uasm_i_daddu(p, ptr, ptr, tmp); | |
536 | uasm_i_dmfc0(p, tmp, C0_BADVADDR); | |
537 | uasm_i_ld(p, ptr, uasm_rel_lo(pgdc), ptr); | |
1da177e4 | 538 | #else |
e30ec452 TS |
539 | UASM_i_LA_mostly(p, ptr, pgdc); |
540 | uasm_i_ld(p, ptr, uasm_rel_lo(pgdc), ptr); | |
1da177e4 LT |
541 | #endif |
542 | ||
e30ec452 | 543 | uasm_l_vmalloc_done(l, *p); |
242954b5 RB |
544 | |
545 | if (PGDIR_SHIFT - 3 < 32) /* get pgd offset in bytes */ | |
e30ec452 | 546 | uasm_i_dsrl(p, tmp, tmp, PGDIR_SHIFT-3); |
242954b5 | 547 | else |
e30ec452 TS |
548 | uasm_i_dsrl32(p, tmp, tmp, PGDIR_SHIFT - 3 - 32); |
549 | ||
550 | uasm_i_andi(p, tmp, tmp, (PTRS_PER_PGD - 1)<<3); | |
551 | uasm_i_daddu(p, ptr, ptr, tmp); /* add in pgd offset */ | |
325f8a0a | 552 | #ifndef __PAGETABLE_PMD_FOLDED |
e30ec452 TS |
553 | uasm_i_dmfc0(p, tmp, C0_BADVADDR); /* get faulting address */ |
554 | uasm_i_ld(p, ptr, 0, ptr); /* get pmd pointer */ | |
555 | uasm_i_dsrl(p, tmp, tmp, PMD_SHIFT-3); /* get pmd offset in bytes */ | |
556 | uasm_i_andi(p, tmp, tmp, (PTRS_PER_PMD - 1)<<3); | |
557 | uasm_i_daddu(p, ptr, ptr, tmp); /* add in pmd offset */ | |
325f8a0a | 558 | #endif |
1da177e4 LT |
559 | } |
560 | ||
561 | /* | |
562 | * BVADDR is the faulting address, PTR is scratch. | |
563 | * PTR will hold the pgd for vmalloc. | |
564 | */ | |
234fcd14 | 565 | static void __cpuinit |
e30ec452 | 566 | build_get_pgd_vmalloc64(u32 **p, struct uasm_label **l, struct uasm_reloc **r, |
1da177e4 LT |
567 | unsigned int bvaddr, unsigned int ptr) |
568 | { | |
569 | long swpd = (long)swapper_pg_dir; | |
570 | ||
e30ec452 | 571 | uasm_l_vmalloc(l, *p); |
1da177e4 | 572 | |
e30ec452 TS |
573 | if (uasm_in_compat_space_p(swpd) && !uasm_rel_lo(swpd)) { |
574 | uasm_il_b(p, r, label_vmalloc_done); | |
575 | uasm_i_lui(p, ptr, uasm_rel_hi(swpd)); | |
1da177e4 | 576 | } else { |
e30ec452 TS |
577 | UASM_i_LA_mostly(p, ptr, swpd); |
578 | uasm_il_b(p, r, label_vmalloc_done); | |
579 | if (uasm_in_compat_space_p(swpd)) | |
580 | uasm_i_addiu(p, ptr, ptr, uasm_rel_lo(swpd)); | |
619b6e18 | 581 | else |
e30ec452 | 582 | uasm_i_daddiu(p, ptr, ptr, uasm_rel_lo(swpd)); |
1da177e4 LT |
583 | } |
584 | } | |
585 | ||
875d43e7 | 586 | #else /* !CONFIG_64BIT */ |
1da177e4 LT |
587 | |
588 | /* | |
589 | * TMP and PTR are scratch. | |
590 | * TMP will be clobbered, PTR will hold the pgd entry. | |
591 | */ | |
234fcd14 | 592 | static void __cpuinit __maybe_unused |
1da177e4 LT |
593 | build_get_pgde32(u32 **p, unsigned int tmp, unsigned int ptr) |
594 | { | |
595 | long pgdc = (long)pgd_current; | |
596 | ||
597 | /* 32 bit SMP has smp_processor_id() stored in CONTEXT. */ | |
598 | #ifdef CONFIG_SMP | |
41c594ab RB |
599 | #ifdef CONFIG_MIPS_MT_SMTC |
600 | /* | |
601 | * SMTC uses TCBind value as "CPU" index | |
602 | */ | |
e30ec452 TS |
603 | uasm_i_mfc0(p, ptr, C0_TCBIND); |
604 | UASM_i_LA_mostly(p, tmp, pgdc); | |
605 | uasm_i_srl(p, ptr, ptr, 19); | |
41c594ab RB |
606 | #else |
607 | /* | |
608 | * smp_processor_id() << 3 is stored in CONTEXT. | |
609 | */ | |
e30ec452 TS |
610 | uasm_i_mfc0(p, ptr, C0_CONTEXT); |
611 | UASM_i_LA_mostly(p, tmp, pgdc); | |
612 | uasm_i_srl(p, ptr, ptr, 23); | |
41c594ab | 613 | #endif |
e30ec452 | 614 | uasm_i_addu(p, ptr, tmp, ptr); |
1da177e4 | 615 | #else |
e30ec452 | 616 | UASM_i_LA_mostly(p, ptr, pgdc); |
1da177e4 | 617 | #endif |
e30ec452 TS |
618 | uasm_i_mfc0(p, tmp, C0_BADVADDR); /* get faulting address */ |
619 | uasm_i_lw(p, ptr, uasm_rel_lo(pgdc), ptr); | |
620 | uasm_i_srl(p, tmp, tmp, PGDIR_SHIFT); /* get pgd only bits */ | |
621 | uasm_i_sll(p, tmp, tmp, PGD_T_LOG2); | |
622 | uasm_i_addu(p, ptr, ptr, tmp); /* add in pgd offset */ | |
1da177e4 LT |
623 | } |
624 | ||
875d43e7 | 625 | #endif /* !CONFIG_64BIT */ |
1da177e4 | 626 | |
234fcd14 | 627 | static void __cpuinit build_adjust_context(u32 **p, unsigned int ctx) |
1da177e4 | 628 | { |
242954b5 | 629 | unsigned int shift = 4 - (PTE_T_LOG2 + 1) + PAGE_SHIFT - 12; |
1da177e4 LT |
630 | unsigned int mask = (PTRS_PER_PTE / 2 - 1) << (PTE_T_LOG2 + 1); |
631 | ||
10cc3529 | 632 | switch (current_cpu_type()) { |
1da177e4 LT |
633 | case CPU_VR41XX: |
634 | case CPU_VR4111: | |
635 | case CPU_VR4121: | |
636 | case CPU_VR4122: | |
637 | case CPU_VR4131: | |
638 | case CPU_VR4181: | |
639 | case CPU_VR4181A: | |
640 | case CPU_VR4133: | |
641 | shift += 2; | |
642 | break; | |
643 | ||
644 | default: | |
645 | break; | |
646 | } | |
647 | ||
648 | if (shift) | |
e30ec452 TS |
649 | UASM_i_SRL(p, ctx, ctx, shift); |
650 | uasm_i_andi(p, ctx, ctx, mask); | |
1da177e4 LT |
651 | } |
652 | ||
234fcd14 | 653 | static void __cpuinit build_get_ptep(u32 **p, unsigned int tmp, unsigned int ptr) |
1da177e4 LT |
654 | { |
655 | /* | |
656 | * Bug workaround for the Nevada. It seems as if under certain | |
657 | * circumstances the move from cp0_context might produce a | |
658 | * bogus result when the mfc0 instruction and its consumer are | |
659 | * in a different cacheline or a load instruction, probably any | |
660 | * memory reference, is between them. | |
661 | */ | |
10cc3529 | 662 | switch (current_cpu_type()) { |
1da177e4 | 663 | case CPU_NEVADA: |
e30ec452 | 664 | UASM_i_LW(p, ptr, 0, ptr); |
1da177e4 LT |
665 | GET_CONTEXT(p, tmp); /* get context reg */ |
666 | break; | |
667 | ||
668 | default: | |
669 | GET_CONTEXT(p, tmp); /* get context reg */ | |
e30ec452 | 670 | UASM_i_LW(p, ptr, 0, ptr); |
1da177e4 LT |
671 | break; |
672 | } | |
673 | ||
674 | build_adjust_context(p, tmp); | |
e30ec452 | 675 | UASM_i_ADDU(p, ptr, ptr, tmp); /* add in offset */ |
1da177e4 LT |
676 | } |
677 | ||
234fcd14 | 678 | static void __cpuinit build_update_entries(u32 **p, unsigned int tmp, |
1da177e4 LT |
679 | unsigned int ptep) |
680 | { | |
681 | /* | |
682 | * 64bit address support (36bit on a 32bit CPU) in a 32bit | |
683 | * Kernel is a special case. Only a few CPUs use it. | |
684 | */ | |
685 | #ifdef CONFIG_64BIT_PHYS_ADDR | |
686 | if (cpu_has_64bits) { | |
e30ec452 TS |
687 | uasm_i_ld(p, tmp, 0, ptep); /* get even pte */ |
688 | uasm_i_ld(p, ptep, sizeof(pte_t), ptep); /* get odd pte */ | |
689 | uasm_i_dsrl(p, tmp, tmp, 6); /* convert to entrylo0 */ | |
690 | uasm_i_mtc0(p, tmp, C0_ENTRYLO0); /* load it */ | |
691 | uasm_i_dsrl(p, ptep, ptep, 6); /* convert to entrylo1 */ | |
692 | uasm_i_mtc0(p, ptep, C0_ENTRYLO1); /* load it */ | |
1da177e4 LT |
693 | } else { |
694 | int pte_off_even = sizeof(pte_t) / 2; | |
695 | int pte_off_odd = pte_off_even + sizeof(pte_t); | |
696 | ||
697 | /* The pte entries are pre-shifted */ | |
e30ec452 TS |
698 | uasm_i_lw(p, tmp, pte_off_even, ptep); /* get even pte */ |
699 | uasm_i_mtc0(p, tmp, C0_ENTRYLO0); /* load it */ | |
700 | uasm_i_lw(p, ptep, pte_off_odd, ptep); /* get odd pte */ | |
701 | uasm_i_mtc0(p, ptep, C0_ENTRYLO1); /* load it */ | |
1da177e4 LT |
702 | } |
703 | #else | |
e30ec452 TS |
704 | UASM_i_LW(p, tmp, 0, ptep); /* get even pte */ |
705 | UASM_i_LW(p, ptep, sizeof(pte_t), ptep); /* get odd pte */ | |
1da177e4 LT |
706 | if (r45k_bvahwbug()) |
707 | build_tlb_probe_entry(p); | |
e30ec452 | 708 | UASM_i_SRL(p, tmp, tmp, 6); /* convert to entrylo0 */ |
1da177e4 | 709 | if (r4k_250MHZhwbug()) |
e30ec452 TS |
710 | uasm_i_mtc0(p, 0, C0_ENTRYLO0); |
711 | uasm_i_mtc0(p, tmp, C0_ENTRYLO0); /* load it */ | |
712 | UASM_i_SRL(p, ptep, ptep, 6); /* convert to entrylo1 */ | |
1da177e4 | 713 | if (r45k_bvahwbug()) |
e30ec452 | 714 | uasm_i_mfc0(p, tmp, C0_INDEX); |
1da177e4 | 715 | if (r4k_250MHZhwbug()) |
e30ec452 TS |
716 | uasm_i_mtc0(p, 0, C0_ENTRYLO1); |
717 | uasm_i_mtc0(p, ptep, C0_ENTRYLO1); /* load it */ | |
1da177e4 LT |
718 | #endif |
719 | } | |
720 | ||
e6f72d3a DD |
721 | /* |
722 | * For a 64-bit kernel, we are using the 64-bit XTLB refill exception | |
723 | * because EXL == 0. If we wrap, we can also use the 32 instruction | |
724 | * slots before the XTLB refill exception handler which belong to the | |
725 | * unused TLB refill exception. | |
726 | */ | |
727 | #define MIPS64_REFILL_INSNS 32 | |
728 | ||
234fcd14 | 729 | static void __cpuinit build_r4000_tlb_refill_handler(void) |
1da177e4 LT |
730 | { |
731 | u32 *p = tlb_handler; | |
e30ec452 TS |
732 | struct uasm_label *l = labels; |
733 | struct uasm_reloc *r = relocs; | |
1da177e4 LT |
734 | u32 *f; |
735 | unsigned int final_len; | |
736 | ||
737 | memset(tlb_handler, 0, sizeof(tlb_handler)); | |
738 | memset(labels, 0, sizeof(labels)); | |
739 | memset(relocs, 0, sizeof(relocs)); | |
740 | memset(final_handler, 0, sizeof(final_handler)); | |
741 | ||
742 | /* | |
743 | * create the plain linear handler | |
744 | */ | |
745 | if (bcm1250_m3_war()) { | |
e30ec452 TS |
746 | UASM_i_MFC0(&p, K0, C0_BADVADDR); |
747 | UASM_i_MFC0(&p, K1, C0_ENTRYHI); | |
748 | uasm_i_xor(&p, K0, K0, K1); | |
749 | UASM_i_SRL(&p, K0, K0, PAGE_SHIFT + 1); | |
750 | uasm_il_bnez(&p, &r, K0, label_leave); | |
751 | /* No need for uasm_i_nop */ | |
1da177e4 LT |
752 | } |
753 | ||
875d43e7 | 754 | #ifdef CONFIG_64BIT |
1da177e4 LT |
755 | build_get_pmde64(&p, &l, &r, K0, K1); /* get pmd in K1 */ |
756 | #else | |
757 | build_get_pgde32(&p, K0, K1); /* get pgd in K1 */ | |
758 | #endif | |
759 | ||
fd062c84 DD |
760 | #ifdef CONFIG_HUGETLB_PAGE |
761 | build_is_huge_pte(&p, &r, K0, K1, label_tlb_huge_update); | |
762 | #endif | |
763 | ||
1da177e4 LT |
764 | build_get_ptep(&p, K0, K1); |
765 | build_update_entries(&p, K0, K1); | |
766 | build_tlb_write_entry(&p, &l, &r, tlb_random); | |
e30ec452 TS |
767 | uasm_l_leave(&l, p); |
768 | uasm_i_eret(&p); /* return from trap */ | |
1da177e4 | 769 | |
fd062c84 DD |
770 | #ifdef CONFIG_HUGETLB_PAGE |
771 | uasm_l_tlb_huge_update(&l, p); | |
772 | UASM_i_LW(&p, K0, 0, K1); | |
773 | build_huge_update_entries(&p, K0, K1); | |
774 | build_huge_tlb_write_entry(&p, &l, &r, K0, tlb_random); | |
775 | #endif | |
776 | ||
875d43e7 | 777 | #ifdef CONFIG_64BIT |
1da177e4 LT |
778 | build_get_pgd_vmalloc64(&p, &l, &r, K0, K1); |
779 | #endif | |
780 | ||
781 | /* | |
782 | * Overflow check: For the 64bit handler, we need at least one | |
783 | * free instruction slot for the wrap-around branch. In worst | |
784 | * case, if the intended insertion point is a delay slot, we | |
4b3f686d | 785 | * need three, with the second nop'ed and the third being |
1da177e4 LT |
786 | * unused. |
787 | */ | |
2a21c730 FZ |
788 | /* Loongson2 ebase is different than r4k, we have more space */ |
789 | #if defined(CONFIG_32BIT) || defined(CONFIG_CPU_LOONGSON2) | |
1da177e4 LT |
790 | if ((p - tlb_handler) > 64) |
791 | panic("TLB refill handler space exceeded"); | |
792 | #else | |
e6f72d3a DD |
793 | if (((p - tlb_handler) > (MIPS64_REFILL_INSNS * 2) - 1) |
794 | || (((p - tlb_handler) > (MIPS64_REFILL_INSNS * 2) - 3) | |
795 | && uasm_insn_has_bdelay(relocs, | |
796 | tlb_handler + MIPS64_REFILL_INSNS - 3))) | |
1da177e4 LT |
797 | panic("TLB refill handler space exceeded"); |
798 | #endif | |
799 | ||
800 | /* | |
801 | * Now fold the handler in the TLB refill handler space. | |
802 | */ | |
2a21c730 | 803 | #if defined(CONFIG_32BIT) || defined(CONFIG_CPU_LOONGSON2) |
1da177e4 LT |
804 | f = final_handler; |
805 | /* Simplest case, just copy the handler. */ | |
e30ec452 | 806 | uasm_copy_handler(relocs, labels, tlb_handler, p, f); |
1da177e4 | 807 | final_len = p - tlb_handler; |
875d43e7 | 808 | #else /* CONFIG_64BIT */ |
e6f72d3a DD |
809 | f = final_handler + MIPS64_REFILL_INSNS; |
810 | if ((p - tlb_handler) <= MIPS64_REFILL_INSNS) { | |
1da177e4 | 811 | /* Just copy the handler. */ |
e30ec452 | 812 | uasm_copy_handler(relocs, labels, tlb_handler, p, f); |
1da177e4 LT |
813 | final_len = p - tlb_handler; |
814 | } else { | |
fd062c84 DD |
815 | #if defined(CONFIG_HUGETLB_PAGE) |
816 | const enum label_id ls = label_tlb_huge_update; | |
95affdda DD |
817 | #else |
818 | const enum label_id ls = label_vmalloc; | |
819 | #endif | |
820 | u32 *split; | |
821 | int ov = 0; | |
822 | int i; | |
823 | ||
824 | for (i = 0; i < ARRAY_SIZE(labels) && labels[i].lab != ls; i++) | |
825 | ; | |
826 | BUG_ON(i == ARRAY_SIZE(labels)); | |
827 | split = labels[i].addr; | |
1da177e4 LT |
828 | |
829 | /* | |
95affdda | 830 | * See if we have overflown one way or the other. |
1da177e4 | 831 | */ |
95affdda DD |
832 | if (split > tlb_handler + MIPS64_REFILL_INSNS || |
833 | split < p - MIPS64_REFILL_INSNS) | |
834 | ov = 1; | |
835 | ||
836 | if (ov) { | |
837 | /* | |
838 | * Split two instructions before the end. One | |
839 | * for the branch and one for the instruction | |
840 | * in the delay slot. | |
841 | */ | |
842 | split = tlb_handler + MIPS64_REFILL_INSNS - 2; | |
843 | ||
844 | /* | |
845 | * If the branch would fall in a delay slot, | |
846 | * we must back up an additional instruction | |
847 | * so that it is no longer in a delay slot. | |
848 | */ | |
849 | if (uasm_insn_has_bdelay(relocs, split - 1)) | |
850 | split--; | |
851 | } | |
1da177e4 | 852 | /* Copy first part of the handler. */ |
e30ec452 | 853 | uasm_copy_handler(relocs, labels, tlb_handler, split, f); |
1da177e4 LT |
854 | f += split - tlb_handler; |
855 | ||
95affdda DD |
856 | if (ov) { |
857 | /* Insert branch. */ | |
858 | uasm_l_split(&l, final_handler); | |
859 | uasm_il_b(&f, &r, label_split); | |
860 | if (uasm_insn_has_bdelay(relocs, split)) | |
861 | uasm_i_nop(&f); | |
862 | else { | |
863 | uasm_copy_handler(relocs, labels, | |
864 | split, split + 1, f); | |
865 | uasm_move_labels(labels, f, f + 1, -1); | |
866 | f++; | |
867 | split++; | |
868 | } | |
1da177e4 LT |
869 | } |
870 | ||
871 | /* Copy the rest of the handler. */ | |
e30ec452 | 872 | uasm_copy_handler(relocs, labels, split, p, final_handler); |
e6f72d3a DD |
873 | final_len = (f - (final_handler + MIPS64_REFILL_INSNS)) + |
874 | (p - split); | |
1da177e4 | 875 | } |
875d43e7 | 876 | #endif /* CONFIG_64BIT */ |
1da177e4 | 877 | |
e30ec452 TS |
878 | uasm_resolve_relocs(relocs, labels); |
879 | pr_debug("Wrote TLB refill handler (%u instructions).\n", | |
880 | final_len); | |
1da177e4 | 881 | |
91b05e67 | 882 | memcpy((void *)ebase, final_handler, 0x100); |
92b1e6a6 FBH |
883 | |
884 | dump_handler((u32 *)ebase, 64); | |
1da177e4 LT |
885 | } |
886 | ||
887 | /* | |
888 | * TLB load/store/modify handlers. | |
889 | * | |
890 | * Only the fastpath gets synthesized at runtime, the slowpath for | |
891 | * do_page_fault remains normal asm. | |
892 | */ | |
893 | extern void tlb_do_page_fault_0(void); | |
894 | extern void tlb_do_page_fault_1(void); | |
895 | ||
1da177e4 LT |
896 | /* |
897 | * 128 instructions for the fastpath handler is generous and should | |
898 | * never be exceeded. | |
899 | */ | |
900 | #define FASTPATH_SIZE 128 | |
901 | ||
cbdbe07f FBH |
902 | u32 handle_tlbl[FASTPATH_SIZE] __cacheline_aligned; |
903 | u32 handle_tlbs[FASTPATH_SIZE] __cacheline_aligned; | |
904 | u32 handle_tlbm[FASTPATH_SIZE] __cacheline_aligned; | |
1da177e4 | 905 | |
234fcd14 | 906 | static void __cpuinit |
bd1437e4 | 907 | iPTE_LW(u32 **p, unsigned int pte, unsigned int ptr) |
1da177e4 LT |
908 | { |
909 | #ifdef CONFIG_SMP | |
910 | # ifdef CONFIG_64BIT_PHYS_ADDR | |
911 | if (cpu_has_64bits) | |
e30ec452 | 912 | uasm_i_lld(p, pte, 0, ptr); |
1da177e4 LT |
913 | else |
914 | # endif | |
e30ec452 | 915 | UASM_i_LL(p, pte, 0, ptr); |
1da177e4 LT |
916 | #else |
917 | # ifdef CONFIG_64BIT_PHYS_ADDR | |
918 | if (cpu_has_64bits) | |
e30ec452 | 919 | uasm_i_ld(p, pte, 0, ptr); |
1da177e4 LT |
920 | else |
921 | # endif | |
e30ec452 | 922 | UASM_i_LW(p, pte, 0, ptr); |
1da177e4 LT |
923 | #endif |
924 | } | |
925 | ||
234fcd14 | 926 | static void __cpuinit |
e30ec452 | 927 | iPTE_SW(u32 **p, struct uasm_reloc **r, unsigned int pte, unsigned int ptr, |
63b2d2f4 | 928 | unsigned int mode) |
1da177e4 | 929 | { |
63b2d2f4 TS |
930 | #ifdef CONFIG_64BIT_PHYS_ADDR |
931 | unsigned int hwmode = mode & (_PAGE_VALID | _PAGE_DIRTY); | |
932 | #endif | |
933 | ||
e30ec452 | 934 | uasm_i_ori(p, pte, pte, mode); |
1da177e4 LT |
935 | #ifdef CONFIG_SMP |
936 | # ifdef CONFIG_64BIT_PHYS_ADDR | |
937 | if (cpu_has_64bits) | |
e30ec452 | 938 | uasm_i_scd(p, pte, 0, ptr); |
1da177e4 LT |
939 | else |
940 | # endif | |
e30ec452 | 941 | UASM_i_SC(p, pte, 0, ptr); |
1da177e4 LT |
942 | |
943 | if (r10000_llsc_war()) | |
e30ec452 | 944 | uasm_il_beqzl(p, r, pte, label_smp_pgtable_change); |
1da177e4 | 945 | else |
e30ec452 | 946 | uasm_il_beqz(p, r, pte, label_smp_pgtable_change); |
1da177e4 LT |
947 | |
948 | # ifdef CONFIG_64BIT_PHYS_ADDR | |
949 | if (!cpu_has_64bits) { | |
e30ec452 TS |
950 | /* no uasm_i_nop needed */ |
951 | uasm_i_ll(p, pte, sizeof(pte_t) / 2, ptr); | |
952 | uasm_i_ori(p, pte, pte, hwmode); | |
953 | uasm_i_sc(p, pte, sizeof(pte_t) / 2, ptr); | |
954 | uasm_il_beqz(p, r, pte, label_smp_pgtable_change); | |
955 | /* no uasm_i_nop needed */ | |
956 | uasm_i_lw(p, pte, 0, ptr); | |
1da177e4 | 957 | } else |
e30ec452 | 958 | uasm_i_nop(p); |
1da177e4 | 959 | # else |
e30ec452 | 960 | uasm_i_nop(p); |
1da177e4 LT |
961 | # endif |
962 | #else | |
963 | # ifdef CONFIG_64BIT_PHYS_ADDR | |
964 | if (cpu_has_64bits) | |
e30ec452 | 965 | uasm_i_sd(p, pte, 0, ptr); |
1da177e4 LT |
966 | else |
967 | # endif | |
e30ec452 | 968 | UASM_i_SW(p, pte, 0, ptr); |
1da177e4 LT |
969 | |
970 | # ifdef CONFIG_64BIT_PHYS_ADDR | |
971 | if (!cpu_has_64bits) { | |
e30ec452 TS |
972 | uasm_i_lw(p, pte, sizeof(pte_t) / 2, ptr); |
973 | uasm_i_ori(p, pte, pte, hwmode); | |
974 | uasm_i_sw(p, pte, sizeof(pte_t) / 2, ptr); | |
975 | uasm_i_lw(p, pte, 0, ptr); | |
1da177e4 LT |
976 | } |
977 | # endif | |
978 | #endif | |
979 | } | |
980 | ||
981 | /* | |
982 | * Check if PTE is present, if not then jump to LABEL. PTR points to | |
983 | * the page table where this PTE is located, PTE will be re-loaded | |
984 | * with it's original value. | |
985 | */ | |
234fcd14 | 986 | static void __cpuinit |
bd1437e4 | 987 | build_pte_present(u32 **p, struct uasm_reloc **r, |
1da177e4 LT |
988 | unsigned int pte, unsigned int ptr, enum label_id lid) |
989 | { | |
e30ec452 TS |
990 | uasm_i_andi(p, pte, pte, _PAGE_PRESENT | _PAGE_READ); |
991 | uasm_i_xori(p, pte, pte, _PAGE_PRESENT | _PAGE_READ); | |
992 | uasm_il_bnez(p, r, pte, lid); | |
bd1437e4 | 993 | iPTE_LW(p, pte, ptr); |
1da177e4 LT |
994 | } |
995 | ||
996 | /* Make PTE valid, store result in PTR. */ | |
234fcd14 | 997 | static void __cpuinit |
e30ec452 | 998 | build_make_valid(u32 **p, struct uasm_reloc **r, unsigned int pte, |
1da177e4 LT |
999 | unsigned int ptr) |
1000 | { | |
63b2d2f4 TS |
1001 | unsigned int mode = _PAGE_VALID | _PAGE_ACCESSED; |
1002 | ||
1003 | iPTE_SW(p, r, pte, ptr, mode); | |
1da177e4 LT |
1004 | } |
1005 | ||
1006 | /* | |
1007 | * Check if PTE can be written to, if not branch to LABEL. Regardless | |
1008 | * restore PTE with value from PTR when done. | |
1009 | */ | |
234fcd14 | 1010 | static void __cpuinit |
bd1437e4 | 1011 | build_pte_writable(u32 **p, struct uasm_reloc **r, |
1da177e4 LT |
1012 | unsigned int pte, unsigned int ptr, enum label_id lid) |
1013 | { | |
e30ec452 TS |
1014 | uasm_i_andi(p, pte, pte, _PAGE_PRESENT | _PAGE_WRITE); |
1015 | uasm_i_xori(p, pte, pte, _PAGE_PRESENT | _PAGE_WRITE); | |
1016 | uasm_il_bnez(p, r, pte, lid); | |
bd1437e4 | 1017 | iPTE_LW(p, pte, ptr); |
1da177e4 LT |
1018 | } |
1019 | ||
1020 | /* Make PTE writable, update software status bits as well, then store | |
1021 | * at PTR. | |
1022 | */ | |
234fcd14 | 1023 | static void __cpuinit |
e30ec452 | 1024 | build_make_write(u32 **p, struct uasm_reloc **r, unsigned int pte, |
1da177e4 LT |
1025 | unsigned int ptr) |
1026 | { | |
63b2d2f4 TS |
1027 | unsigned int mode = (_PAGE_ACCESSED | _PAGE_MODIFIED | _PAGE_VALID |
1028 | | _PAGE_DIRTY); | |
1029 | ||
1030 | iPTE_SW(p, r, pte, ptr, mode); | |
1da177e4 LT |
1031 | } |
1032 | ||
1033 | /* | |
1034 | * Check if PTE can be modified, if not branch to LABEL. Regardless | |
1035 | * restore PTE with value from PTR when done. | |
1036 | */ | |
234fcd14 | 1037 | static void __cpuinit |
bd1437e4 | 1038 | build_pte_modifiable(u32 **p, struct uasm_reloc **r, |
1da177e4 LT |
1039 | unsigned int pte, unsigned int ptr, enum label_id lid) |
1040 | { | |
e30ec452 TS |
1041 | uasm_i_andi(p, pte, pte, _PAGE_WRITE); |
1042 | uasm_il_beqz(p, r, pte, lid); | |
bd1437e4 | 1043 | iPTE_LW(p, pte, ptr); |
1da177e4 LT |
1044 | } |
1045 | ||
82622284 | 1046 | #ifndef CONFIG_MIPS_PGD_C0_CONTEXT |
1da177e4 LT |
1047 | /* |
1048 | * R3000 style TLB load/store/modify handlers. | |
1049 | */ | |
1050 | ||
fded2e50 MR |
1051 | /* |
1052 | * This places the pte into ENTRYLO0 and writes it with tlbwi. | |
1053 | * Then it returns. | |
1054 | */ | |
234fcd14 | 1055 | static void __cpuinit |
fded2e50 | 1056 | build_r3000_pte_reload_tlbwi(u32 **p, unsigned int pte, unsigned int tmp) |
1da177e4 | 1057 | { |
e30ec452 TS |
1058 | uasm_i_mtc0(p, pte, C0_ENTRYLO0); /* cp0 delay */ |
1059 | uasm_i_mfc0(p, tmp, C0_EPC); /* cp0 delay */ | |
1060 | uasm_i_tlbwi(p); | |
1061 | uasm_i_jr(p, tmp); | |
1062 | uasm_i_rfe(p); /* branch delay */ | |
1da177e4 LT |
1063 | } |
1064 | ||
1065 | /* | |
fded2e50 MR |
1066 | * This places the pte into ENTRYLO0 and writes it with tlbwi |
1067 | * or tlbwr as appropriate. This is because the index register | |
1068 | * may have the probe fail bit set as a result of a trap on a | |
1069 | * kseg2 access, i.e. without refill. Then it returns. | |
1da177e4 | 1070 | */ |
234fcd14 | 1071 | static void __cpuinit |
e30ec452 TS |
1072 | build_r3000_tlb_reload_write(u32 **p, struct uasm_label **l, |
1073 | struct uasm_reloc **r, unsigned int pte, | |
1074 | unsigned int tmp) | |
1075 | { | |
1076 | uasm_i_mfc0(p, tmp, C0_INDEX); | |
1077 | uasm_i_mtc0(p, pte, C0_ENTRYLO0); /* cp0 delay */ | |
1078 | uasm_il_bltz(p, r, tmp, label_r3000_write_probe_fail); /* cp0 delay */ | |
1079 | uasm_i_mfc0(p, tmp, C0_EPC); /* branch delay */ | |
1080 | uasm_i_tlbwi(p); /* cp0 delay */ | |
1081 | uasm_i_jr(p, tmp); | |
1082 | uasm_i_rfe(p); /* branch delay */ | |
1083 | uasm_l_r3000_write_probe_fail(l, *p); | |
1084 | uasm_i_tlbwr(p); /* cp0 delay */ | |
1085 | uasm_i_jr(p, tmp); | |
1086 | uasm_i_rfe(p); /* branch delay */ | |
1da177e4 LT |
1087 | } |
1088 | ||
234fcd14 | 1089 | static void __cpuinit |
1da177e4 LT |
1090 | build_r3000_tlbchange_handler_head(u32 **p, unsigned int pte, |
1091 | unsigned int ptr) | |
1092 | { | |
1093 | long pgdc = (long)pgd_current; | |
1094 | ||
e30ec452 TS |
1095 | uasm_i_mfc0(p, pte, C0_BADVADDR); |
1096 | uasm_i_lui(p, ptr, uasm_rel_hi(pgdc)); /* cp0 delay */ | |
1097 | uasm_i_lw(p, ptr, uasm_rel_lo(pgdc), ptr); | |
1098 | uasm_i_srl(p, pte, pte, 22); /* load delay */ | |
1099 | uasm_i_sll(p, pte, pte, 2); | |
1100 | uasm_i_addu(p, ptr, ptr, pte); | |
1101 | uasm_i_mfc0(p, pte, C0_CONTEXT); | |
1102 | uasm_i_lw(p, ptr, 0, ptr); /* cp0 delay */ | |
1103 | uasm_i_andi(p, pte, pte, 0xffc); /* load delay */ | |
1104 | uasm_i_addu(p, ptr, ptr, pte); | |
1105 | uasm_i_lw(p, pte, 0, ptr); | |
1106 | uasm_i_tlbp(p); /* load delay */ | |
1da177e4 LT |
1107 | } |
1108 | ||
234fcd14 | 1109 | static void __cpuinit build_r3000_tlb_load_handler(void) |
1da177e4 LT |
1110 | { |
1111 | u32 *p = handle_tlbl; | |
e30ec452 TS |
1112 | struct uasm_label *l = labels; |
1113 | struct uasm_reloc *r = relocs; | |
1da177e4 LT |
1114 | |
1115 | memset(handle_tlbl, 0, sizeof(handle_tlbl)); | |
1116 | memset(labels, 0, sizeof(labels)); | |
1117 | memset(relocs, 0, sizeof(relocs)); | |
1118 | ||
1119 | build_r3000_tlbchange_handler_head(&p, K0, K1); | |
bd1437e4 | 1120 | build_pte_present(&p, &r, K0, K1, label_nopage_tlbl); |
e30ec452 | 1121 | uasm_i_nop(&p); /* load delay */ |
1da177e4 | 1122 | build_make_valid(&p, &r, K0, K1); |
fded2e50 | 1123 | build_r3000_tlb_reload_write(&p, &l, &r, K0, K1); |
1da177e4 | 1124 | |
e30ec452 TS |
1125 | uasm_l_nopage_tlbl(&l, p); |
1126 | uasm_i_j(&p, (unsigned long)tlb_do_page_fault_0 & 0x0fffffff); | |
1127 | uasm_i_nop(&p); | |
1da177e4 LT |
1128 | |
1129 | if ((p - handle_tlbl) > FASTPATH_SIZE) | |
1130 | panic("TLB load handler fastpath space exceeded"); | |
1131 | ||
e30ec452 TS |
1132 | uasm_resolve_relocs(relocs, labels); |
1133 | pr_debug("Wrote TLB load handler fastpath (%u instructions).\n", | |
1134 | (unsigned int)(p - handle_tlbl)); | |
1da177e4 | 1135 | |
92b1e6a6 | 1136 | dump_handler(handle_tlbl, ARRAY_SIZE(handle_tlbl)); |
1da177e4 LT |
1137 | } |
1138 | ||
234fcd14 | 1139 | static void __cpuinit build_r3000_tlb_store_handler(void) |
1da177e4 LT |
1140 | { |
1141 | u32 *p = handle_tlbs; | |
e30ec452 TS |
1142 | struct uasm_label *l = labels; |
1143 | struct uasm_reloc *r = relocs; | |
1da177e4 LT |
1144 | |
1145 | memset(handle_tlbs, 0, sizeof(handle_tlbs)); | |
1146 | memset(labels, 0, sizeof(labels)); | |
1147 | memset(relocs, 0, sizeof(relocs)); | |
1148 | ||
1149 | build_r3000_tlbchange_handler_head(&p, K0, K1); | |
bd1437e4 | 1150 | build_pte_writable(&p, &r, K0, K1, label_nopage_tlbs); |
e30ec452 | 1151 | uasm_i_nop(&p); /* load delay */ |
1da177e4 | 1152 | build_make_write(&p, &r, K0, K1); |
fded2e50 | 1153 | build_r3000_tlb_reload_write(&p, &l, &r, K0, K1); |
1da177e4 | 1154 | |
e30ec452 TS |
1155 | uasm_l_nopage_tlbs(&l, p); |
1156 | uasm_i_j(&p, (unsigned long)tlb_do_page_fault_1 & 0x0fffffff); | |
1157 | uasm_i_nop(&p); | |
1da177e4 LT |
1158 | |
1159 | if ((p - handle_tlbs) > FASTPATH_SIZE) | |
1160 | panic("TLB store handler fastpath space exceeded"); | |
1161 | ||
e30ec452 TS |
1162 | uasm_resolve_relocs(relocs, labels); |
1163 | pr_debug("Wrote TLB store handler fastpath (%u instructions).\n", | |
1164 | (unsigned int)(p - handle_tlbs)); | |
1da177e4 | 1165 | |
92b1e6a6 | 1166 | dump_handler(handle_tlbs, ARRAY_SIZE(handle_tlbs)); |
1da177e4 LT |
1167 | } |
1168 | ||
234fcd14 | 1169 | static void __cpuinit build_r3000_tlb_modify_handler(void) |
1da177e4 LT |
1170 | { |
1171 | u32 *p = handle_tlbm; | |
e30ec452 TS |
1172 | struct uasm_label *l = labels; |
1173 | struct uasm_reloc *r = relocs; | |
1da177e4 LT |
1174 | |
1175 | memset(handle_tlbm, 0, sizeof(handle_tlbm)); | |
1176 | memset(labels, 0, sizeof(labels)); | |
1177 | memset(relocs, 0, sizeof(relocs)); | |
1178 | ||
1179 | build_r3000_tlbchange_handler_head(&p, K0, K1); | |
bd1437e4 | 1180 | build_pte_modifiable(&p, &r, K0, K1, label_nopage_tlbm); |
e30ec452 | 1181 | uasm_i_nop(&p); /* load delay */ |
1da177e4 | 1182 | build_make_write(&p, &r, K0, K1); |
fded2e50 | 1183 | build_r3000_pte_reload_tlbwi(&p, K0, K1); |
1da177e4 | 1184 | |
e30ec452 TS |
1185 | uasm_l_nopage_tlbm(&l, p); |
1186 | uasm_i_j(&p, (unsigned long)tlb_do_page_fault_1 & 0x0fffffff); | |
1187 | uasm_i_nop(&p); | |
1da177e4 LT |
1188 | |
1189 | if ((p - handle_tlbm) > FASTPATH_SIZE) | |
1190 | panic("TLB modify handler fastpath space exceeded"); | |
1191 | ||
e30ec452 TS |
1192 | uasm_resolve_relocs(relocs, labels); |
1193 | pr_debug("Wrote TLB modify handler fastpath (%u instructions).\n", | |
1194 | (unsigned int)(p - handle_tlbm)); | |
1da177e4 | 1195 | |
92b1e6a6 | 1196 | dump_handler(handle_tlbm, ARRAY_SIZE(handle_tlbm)); |
1da177e4 | 1197 | } |
82622284 | 1198 | #endif /* CONFIG_MIPS_PGD_C0_CONTEXT */ |
1da177e4 LT |
1199 | |
1200 | /* | |
1201 | * R4000 style TLB load/store/modify handlers. | |
1202 | */ | |
234fcd14 | 1203 | static void __cpuinit |
e30ec452 TS |
1204 | build_r4000_tlbchange_handler_head(u32 **p, struct uasm_label **l, |
1205 | struct uasm_reloc **r, unsigned int pte, | |
1da177e4 LT |
1206 | unsigned int ptr) |
1207 | { | |
875d43e7 | 1208 | #ifdef CONFIG_64BIT |
1da177e4 LT |
1209 | build_get_pmde64(p, l, r, pte, ptr); /* get pmd in ptr */ |
1210 | #else | |
1211 | build_get_pgde32(p, pte, ptr); /* get pgd in ptr */ | |
1212 | #endif | |
1213 | ||
fd062c84 DD |
1214 | #ifdef CONFIG_HUGETLB_PAGE |
1215 | /* | |
1216 | * For huge tlb entries, pmd doesn't contain an address but | |
1217 | * instead contains the tlb pte. Check the PAGE_HUGE bit and | |
1218 | * see if we need to jump to huge tlb processing. | |
1219 | */ | |
1220 | build_is_huge_pte(p, r, pte, ptr, label_tlb_huge_update); | |
1221 | #endif | |
1222 | ||
e30ec452 TS |
1223 | UASM_i_MFC0(p, pte, C0_BADVADDR); |
1224 | UASM_i_LW(p, ptr, 0, ptr); | |
1225 | UASM_i_SRL(p, pte, pte, PAGE_SHIFT + PTE_ORDER - PTE_T_LOG2); | |
1226 | uasm_i_andi(p, pte, pte, (PTRS_PER_PTE - 1) << PTE_T_LOG2); | |
1227 | UASM_i_ADDU(p, ptr, ptr, pte); | |
1da177e4 LT |
1228 | |
1229 | #ifdef CONFIG_SMP | |
e30ec452 TS |
1230 | uasm_l_smp_pgtable_change(l, *p); |
1231 | #endif | |
bd1437e4 | 1232 | iPTE_LW(p, pte, ptr); /* get even pte */ |
8df5beac MR |
1233 | if (!m4kc_tlbp_war()) |
1234 | build_tlb_probe_entry(p); | |
1da177e4 LT |
1235 | } |
1236 | ||
234fcd14 | 1237 | static void __cpuinit |
e30ec452 TS |
1238 | build_r4000_tlbchange_handler_tail(u32 **p, struct uasm_label **l, |
1239 | struct uasm_reloc **r, unsigned int tmp, | |
1da177e4 LT |
1240 | unsigned int ptr) |
1241 | { | |
e30ec452 TS |
1242 | uasm_i_ori(p, ptr, ptr, sizeof(pte_t)); |
1243 | uasm_i_xori(p, ptr, ptr, sizeof(pte_t)); | |
1da177e4 LT |
1244 | build_update_entries(p, tmp, ptr); |
1245 | build_tlb_write_entry(p, l, r, tlb_indexed); | |
e30ec452 TS |
1246 | uasm_l_leave(l, *p); |
1247 | uasm_i_eret(p); /* return from trap */ | |
1da177e4 | 1248 | |
875d43e7 | 1249 | #ifdef CONFIG_64BIT |
1da177e4 LT |
1250 | build_get_pgd_vmalloc64(p, l, r, tmp, ptr); |
1251 | #endif | |
1252 | } | |
1253 | ||
234fcd14 | 1254 | static void __cpuinit build_r4000_tlb_load_handler(void) |
1da177e4 LT |
1255 | { |
1256 | u32 *p = handle_tlbl; | |
e30ec452 TS |
1257 | struct uasm_label *l = labels; |
1258 | struct uasm_reloc *r = relocs; | |
1da177e4 LT |
1259 | |
1260 | memset(handle_tlbl, 0, sizeof(handle_tlbl)); | |
1261 | memset(labels, 0, sizeof(labels)); | |
1262 | memset(relocs, 0, sizeof(relocs)); | |
1263 | ||
1264 | if (bcm1250_m3_war()) { | |
e30ec452 TS |
1265 | UASM_i_MFC0(&p, K0, C0_BADVADDR); |
1266 | UASM_i_MFC0(&p, K1, C0_ENTRYHI); | |
1267 | uasm_i_xor(&p, K0, K0, K1); | |
1268 | UASM_i_SRL(&p, K0, K0, PAGE_SHIFT + 1); | |
1269 | uasm_il_bnez(&p, &r, K0, label_leave); | |
1270 | /* No need for uasm_i_nop */ | |
1da177e4 LT |
1271 | } |
1272 | ||
1273 | build_r4000_tlbchange_handler_head(&p, &l, &r, K0, K1); | |
bd1437e4 | 1274 | build_pte_present(&p, &r, K0, K1, label_nopage_tlbl); |
8df5beac MR |
1275 | if (m4kc_tlbp_war()) |
1276 | build_tlb_probe_entry(&p); | |
1da177e4 LT |
1277 | build_make_valid(&p, &r, K0, K1); |
1278 | build_r4000_tlbchange_handler_tail(&p, &l, &r, K0, K1); | |
1279 | ||
fd062c84 DD |
1280 | #ifdef CONFIG_HUGETLB_PAGE |
1281 | /* | |
1282 | * This is the entry point when build_r4000_tlbchange_handler_head | |
1283 | * spots a huge page. | |
1284 | */ | |
1285 | uasm_l_tlb_huge_update(&l, p); | |
1286 | iPTE_LW(&p, K0, K1); | |
1287 | build_pte_present(&p, &r, K0, K1, label_nopage_tlbl); | |
1288 | build_tlb_probe_entry(&p); | |
1289 | uasm_i_ori(&p, K0, K0, (_PAGE_ACCESSED | _PAGE_VALID)); | |
1290 | build_huge_handler_tail(&p, &r, &l, K0, K1); | |
1291 | #endif | |
1292 | ||
e30ec452 TS |
1293 | uasm_l_nopage_tlbl(&l, p); |
1294 | uasm_i_j(&p, (unsigned long)tlb_do_page_fault_0 & 0x0fffffff); | |
1295 | uasm_i_nop(&p); | |
1da177e4 LT |
1296 | |
1297 | if ((p - handle_tlbl) > FASTPATH_SIZE) | |
1298 | panic("TLB load handler fastpath space exceeded"); | |
1299 | ||
e30ec452 TS |
1300 | uasm_resolve_relocs(relocs, labels); |
1301 | pr_debug("Wrote TLB load handler fastpath (%u instructions).\n", | |
1302 | (unsigned int)(p - handle_tlbl)); | |
1da177e4 | 1303 | |
92b1e6a6 | 1304 | dump_handler(handle_tlbl, ARRAY_SIZE(handle_tlbl)); |
1da177e4 LT |
1305 | } |
1306 | ||
234fcd14 | 1307 | static void __cpuinit build_r4000_tlb_store_handler(void) |
1da177e4 LT |
1308 | { |
1309 | u32 *p = handle_tlbs; | |
e30ec452 TS |
1310 | struct uasm_label *l = labels; |
1311 | struct uasm_reloc *r = relocs; | |
1da177e4 LT |
1312 | |
1313 | memset(handle_tlbs, 0, sizeof(handle_tlbs)); | |
1314 | memset(labels, 0, sizeof(labels)); | |
1315 | memset(relocs, 0, sizeof(relocs)); | |
1316 | ||
1317 | build_r4000_tlbchange_handler_head(&p, &l, &r, K0, K1); | |
bd1437e4 | 1318 | build_pte_writable(&p, &r, K0, K1, label_nopage_tlbs); |
8df5beac MR |
1319 | if (m4kc_tlbp_war()) |
1320 | build_tlb_probe_entry(&p); | |
1da177e4 LT |
1321 | build_make_write(&p, &r, K0, K1); |
1322 | build_r4000_tlbchange_handler_tail(&p, &l, &r, K0, K1); | |
1323 | ||
fd062c84 DD |
1324 | #ifdef CONFIG_HUGETLB_PAGE |
1325 | /* | |
1326 | * This is the entry point when | |
1327 | * build_r4000_tlbchange_handler_head spots a huge page. | |
1328 | */ | |
1329 | uasm_l_tlb_huge_update(&l, p); | |
1330 | iPTE_LW(&p, K0, K1); | |
1331 | build_pte_writable(&p, &r, K0, K1, label_nopage_tlbs); | |
1332 | build_tlb_probe_entry(&p); | |
1333 | uasm_i_ori(&p, K0, K0, | |
1334 | _PAGE_ACCESSED | _PAGE_MODIFIED | _PAGE_VALID | _PAGE_DIRTY); | |
1335 | build_huge_handler_tail(&p, &r, &l, K0, K1); | |
1336 | #endif | |
1337 | ||
e30ec452 TS |
1338 | uasm_l_nopage_tlbs(&l, p); |
1339 | uasm_i_j(&p, (unsigned long)tlb_do_page_fault_1 & 0x0fffffff); | |
1340 | uasm_i_nop(&p); | |
1da177e4 LT |
1341 | |
1342 | if ((p - handle_tlbs) > FASTPATH_SIZE) | |
1343 | panic("TLB store handler fastpath space exceeded"); | |
1344 | ||
e30ec452 TS |
1345 | uasm_resolve_relocs(relocs, labels); |
1346 | pr_debug("Wrote TLB store handler fastpath (%u instructions).\n", | |
1347 | (unsigned int)(p - handle_tlbs)); | |
1da177e4 | 1348 | |
92b1e6a6 | 1349 | dump_handler(handle_tlbs, ARRAY_SIZE(handle_tlbs)); |
1da177e4 LT |
1350 | } |
1351 | ||
234fcd14 | 1352 | static void __cpuinit build_r4000_tlb_modify_handler(void) |
1da177e4 LT |
1353 | { |
1354 | u32 *p = handle_tlbm; | |
e30ec452 TS |
1355 | struct uasm_label *l = labels; |
1356 | struct uasm_reloc *r = relocs; | |
1da177e4 LT |
1357 | |
1358 | memset(handle_tlbm, 0, sizeof(handle_tlbm)); | |
1359 | memset(labels, 0, sizeof(labels)); | |
1360 | memset(relocs, 0, sizeof(relocs)); | |
1361 | ||
1362 | build_r4000_tlbchange_handler_head(&p, &l, &r, K0, K1); | |
bd1437e4 | 1363 | build_pte_modifiable(&p, &r, K0, K1, label_nopage_tlbm); |
8df5beac MR |
1364 | if (m4kc_tlbp_war()) |
1365 | build_tlb_probe_entry(&p); | |
1da177e4 LT |
1366 | /* Present and writable bits set, set accessed and dirty bits. */ |
1367 | build_make_write(&p, &r, K0, K1); | |
1368 | build_r4000_tlbchange_handler_tail(&p, &l, &r, K0, K1); | |
1369 | ||
fd062c84 DD |
1370 | #ifdef CONFIG_HUGETLB_PAGE |
1371 | /* | |
1372 | * This is the entry point when | |
1373 | * build_r4000_tlbchange_handler_head spots a huge page. | |
1374 | */ | |
1375 | uasm_l_tlb_huge_update(&l, p); | |
1376 | iPTE_LW(&p, K0, K1); | |
1377 | build_pte_modifiable(&p, &r, K0, K1, label_nopage_tlbm); | |
1378 | build_tlb_probe_entry(&p); | |
1379 | uasm_i_ori(&p, K0, K0, | |
1380 | _PAGE_ACCESSED | _PAGE_MODIFIED | _PAGE_VALID | _PAGE_DIRTY); | |
1381 | build_huge_handler_tail(&p, &r, &l, K0, K1); | |
1382 | #endif | |
1383 | ||
e30ec452 TS |
1384 | uasm_l_nopage_tlbm(&l, p); |
1385 | uasm_i_j(&p, (unsigned long)tlb_do_page_fault_1 & 0x0fffffff); | |
1386 | uasm_i_nop(&p); | |
1da177e4 LT |
1387 | |
1388 | if ((p - handle_tlbm) > FASTPATH_SIZE) | |
1389 | panic("TLB modify handler fastpath space exceeded"); | |
1390 | ||
e30ec452 TS |
1391 | uasm_resolve_relocs(relocs, labels); |
1392 | pr_debug("Wrote TLB modify handler fastpath (%u instructions).\n", | |
1393 | (unsigned int)(p - handle_tlbm)); | |
115f2a44 | 1394 | |
92b1e6a6 | 1395 | dump_handler(handle_tlbm, ARRAY_SIZE(handle_tlbm)); |
1da177e4 LT |
1396 | } |
1397 | ||
234fcd14 | 1398 | void __cpuinit build_tlb_refill_handler(void) |
1da177e4 LT |
1399 | { |
1400 | /* | |
1401 | * The refill handler is generated per-CPU, multi-node systems | |
1402 | * may have local storage for it. The other handlers are only | |
1403 | * needed once. | |
1404 | */ | |
1405 | static int run_once = 0; | |
1406 | ||
10cc3529 | 1407 | switch (current_cpu_type()) { |
1da177e4 LT |
1408 | case CPU_R2000: |
1409 | case CPU_R3000: | |
1410 | case CPU_R3000A: | |
1411 | case CPU_R3081E: | |
1412 | case CPU_TX3912: | |
1413 | case CPU_TX3922: | |
1414 | case CPU_TX3927: | |
82622284 | 1415 | #ifndef CONFIG_MIPS_PGD_C0_CONTEXT |
1da177e4 LT |
1416 | build_r3000_tlb_refill_handler(); |
1417 | if (!run_once) { | |
1418 | build_r3000_tlb_load_handler(); | |
1419 | build_r3000_tlb_store_handler(); | |
1420 | build_r3000_tlb_modify_handler(); | |
1421 | run_once++; | |
1422 | } | |
82622284 DD |
1423 | #else |
1424 | panic("No R3000 TLB refill handler"); | |
1425 | #endif | |
1da177e4 LT |
1426 | break; |
1427 | ||
1428 | case CPU_R6000: | |
1429 | case CPU_R6000A: | |
1430 | panic("No R6000 TLB refill handler yet"); | |
1431 | break; | |
1432 | ||
1433 | case CPU_R8000: | |
1434 | panic("No R8000 TLB refill handler yet"); | |
1435 | break; | |
1436 | ||
1437 | default: | |
1438 | build_r4000_tlb_refill_handler(); | |
1439 | if (!run_once) { | |
1440 | build_r4000_tlb_load_handler(); | |
1441 | build_r4000_tlb_store_handler(); | |
1442 | build_r4000_tlb_modify_handler(); | |
1443 | run_once++; | |
1444 | } | |
1445 | } | |
1446 | } | |
1d40cfcd | 1447 | |
234fcd14 | 1448 | void __cpuinit flush_tlb_handlers(void) |
1d40cfcd | 1449 | { |
e0cee3ee | 1450 | local_flush_icache_range((unsigned long)handle_tlbl, |
1d40cfcd | 1451 | (unsigned long)handle_tlbl + sizeof(handle_tlbl)); |
e0cee3ee | 1452 | local_flush_icache_range((unsigned long)handle_tlbs, |
1d40cfcd | 1453 | (unsigned long)handle_tlbs + sizeof(handle_tlbs)); |
e0cee3ee | 1454 | local_flush_icache_range((unsigned long)handle_tlbm, |
1d40cfcd RB |
1455 | (unsigned long)handle_tlbm + sizeof(handle_tlbm)); |
1456 | } |