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[MTD] generalise the handling of MTD-specific superblocks
[wrt350n-kernel.git] / arch / sparc / mm / sun4c.c
blob436021ceb2e7bd369490eda32eec58b4460ae815
1 /* $Id: sun4c.c,v 1.212 2001/12/21 04:56:15 davem Exp $
2 * sun4c.c: Doing in software what should be done in hardware.
3 *
4 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
5 * Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be)
6 * Copyright (C) 1996 Andrew Tridgell (Andrew.Tridgell@anu.edu.au)
7 * Copyright (C) 1997-2000 Anton Blanchard (anton@samba.org)
8 * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
9 */
10
11 #define NR_TASK_BUCKETS 512
12
13 #include <linux/kernel.h>
14 #include <linux/mm.h>
15 #include <linux/init.h>
16 #include <linux/bootmem.h>
17 #include <linux/highmem.h>
18 #include <linux/fs.h>
19 #include <linux/seq_file.h>
20
21 #include <asm/scatterlist.h>
22 #include <asm/page.h>
23 #include <asm/pgalloc.h>
24 #include <asm/pgtable.h>
25 #include <asm/vaddrs.h>
26 #include <asm/idprom.h>
27 #include <asm/machines.h>
28 #include <asm/memreg.h>
29 #include <asm/processor.h>
30 #include <asm/auxio.h>
31 #include <asm/io.h>
32 #include <asm/oplib.h>
33 #include <asm/openprom.h>
34 #include <asm/mmu_context.h>
35 #include <asm/sun4paddr.h>
36 #include <asm/highmem.h>
37 #include <asm/btfixup.h>
38 #include <asm/cacheflush.h>
39 #include <asm/tlbflush.h>
40
41 /* Because of our dynamic kernel TLB miss strategy, and how
42 * our DVMA mapping allocation works, you _MUST_:
43 *
44 * 1) Disable interrupts _and_ not touch any dynamic kernel
45 * memory while messing with kernel MMU state. By
46 * dynamic memory I mean any object which is not in
47 * the kernel image itself or a thread_union (both of
48 * which are locked into the MMU).
49 * 2) Disable interrupts while messing with user MMU state.
50 */
51
52 extern int num_segmaps, num_contexts;
53
54 extern unsigned long page_kernel;
55
56 #ifdef CONFIG_SUN4
57 #define SUN4C_VAC_SIZE sun4c_vacinfo.num_bytes
58 #else
59 /* That's it, we prom_halt() on sun4c if the cache size is something other than 65536.
60 * So let's save some cycles and just use that everywhere except for that bootup
61 * sanity check.
62 */
63 #define SUN4C_VAC_SIZE 65536
64 #endif
65
66 #define SUN4C_KERNEL_BUCKETS 32
67
68 /* Flushing the cache. */
69 struct sun4c_vac_props sun4c_vacinfo;
70 unsigned long sun4c_kernel_faults;
71
72 /* Invalidate every sun4c cache line tag. */
73 static void __init sun4c_flush_all(void)
74 {
75 unsigned long begin, end;
76
77 if (sun4c_vacinfo.on)
78 panic("SUN4C: AIEEE, trying to invalidate vac while it is on.");
79
80 /* Clear 'valid' bit in all cache line tags */
81 begin = AC_CACHETAGS;
82 end = (AC_CACHETAGS + SUN4C_VAC_SIZE);
83 while (begin < end) {
84 __asm__ __volatile__("sta %%g0, [%0] %1\n\t" : :
85 "r" (begin), "i" (ASI_CONTROL));
86 begin += sun4c_vacinfo.linesize;
87 }
88 }
89
90 static void sun4c_flush_context_hw(void)
91 {
92 unsigned long end = SUN4C_VAC_SIZE;
93
94 __asm__ __volatile__(
95 "1: addcc %0, -4096, %0\n\t"
96 " bne 1b\n\t"
97 " sta %%g0, [%0] %2"
98 : "=&r" (end)
99 : "0" (end), "i" (ASI_HWFLUSHCONTEXT)
100 : "cc");
101 }
102
103 /* Must be called minimally with IRQs disabled. */
104 static void sun4c_flush_segment_hw(unsigned long addr)
105 {
106 if (sun4c_get_segmap(addr) != invalid_segment) {
107 unsigned long vac_size = SUN4C_VAC_SIZE;
108
109 __asm__ __volatile__(
110 "1: addcc %0, -4096, %0\n\t"
111 " bne 1b\n\t"
112 " sta %%g0, [%2 + %0] %3"
113 : "=&r" (vac_size)
114 : "0" (vac_size), "r" (addr), "i" (ASI_HWFLUSHSEG)
115 : "cc");
116 }
117 }
118
119 /* File local boot time fixups. */
120 BTFIXUPDEF_CALL(void, sun4c_flush_page, unsigned long)
121 BTFIXUPDEF_CALL(void, sun4c_flush_segment, unsigned long)
122 BTFIXUPDEF_CALL(void, sun4c_flush_context, void)
123
124 #define sun4c_flush_page(addr) BTFIXUP_CALL(sun4c_flush_page)(addr)
125 #define sun4c_flush_segment(addr) BTFIXUP_CALL(sun4c_flush_segment)(addr)
126 #define sun4c_flush_context() BTFIXUP_CALL(sun4c_flush_context)()
127
128 /* Must be called minimally with interrupts disabled. */
129 static void sun4c_flush_page_hw(unsigned long addr)
130 {
131 addr &= PAGE_MASK;
132 if ((int)sun4c_get_pte(addr) < 0)
133 __asm__ __volatile__("sta %%g0, [%0] %1"
134 : : "r" (addr), "i" (ASI_HWFLUSHPAGE));
135 }
136
137 /* Don't inline the software version as it eats too many cache lines if expanded. */
138 static void sun4c_flush_context_sw(void)
139 {
140 unsigned long nbytes = SUN4C_VAC_SIZE;
141 unsigned long lsize = sun4c_vacinfo.linesize;
142
143 __asm__ __volatile__(
144 "add %2, %2, %%g1\n\t"
145 "add %2, %%g1, %%g2\n\t"
146 "add %2, %%g2, %%g3\n\t"
147 "add %2, %%g3, %%g4\n\t"
148 "add %2, %%g4, %%g5\n\t"
149 "add %2, %%g5, %%o4\n\t"
150 "add %2, %%o4, %%o5\n"
151 "1:\n\t"
152 "subcc %0, %%o5, %0\n\t"
153 "sta %%g0, [%0] %3\n\t"
154 "sta %%g0, [%0 + %2] %3\n\t"
155 "sta %%g0, [%0 + %%g1] %3\n\t"
156 "sta %%g0, [%0 + %%g2] %3\n\t"
157 "sta %%g0, [%0 + %%g3] %3\n\t"
158 "sta %%g0, [%0 + %%g4] %3\n\t"
159 "sta %%g0, [%0 + %%g5] %3\n\t"
160 "bg 1b\n\t"
161 " sta %%g0, [%1 + %%o4] %3\n"
162 : "=&r" (nbytes)
163 : "0" (nbytes), "r" (lsize), "i" (ASI_FLUSHCTX)
164 : "g1", "g2", "g3", "g4", "g5", "o4", "o5", "cc");
165 }
166
167 /* Don't inline the software version as it eats too many cache lines if expanded. */
168 static void sun4c_flush_segment_sw(unsigned long addr)
169 {
170 if (sun4c_get_segmap(addr) != invalid_segment) {
171 unsigned long nbytes = SUN4C_VAC_SIZE;
172 unsigned long lsize = sun4c_vacinfo.linesize;
173
174 __asm__ __volatile__(
175 "add %2, %2, %%g1\n\t"
176 "add %2, %%g1, %%g2\n\t"
177 "add %2, %%g2, %%g3\n\t"
178 "add %2, %%g3, %%g4\n\t"
179 "add %2, %%g4, %%g5\n\t"
180 "add %2, %%g5, %%o4\n\t"
181 "add %2, %%o4, %%o5\n"
182 "1:\n\t"
183 "subcc %1, %%o5, %1\n\t"
184 "sta %%g0, [%0] %6\n\t"
185 "sta %%g0, [%0 + %2] %6\n\t"
186 "sta %%g0, [%0 + %%g1] %6\n\t"
187 "sta %%g0, [%0 + %%g2] %6\n\t"
188 "sta %%g0, [%0 + %%g3] %6\n\t"
189 "sta %%g0, [%0 + %%g4] %6\n\t"
190 "sta %%g0, [%0 + %%g5] %6\n\t"
191 "sta %%g0, [%0 + %%o4] %6\n\t"
192 "bg 1b\n\t"
193 " add %0, %%o5, %0\n"
194 : "=&r" (addr), "=&r" (nbytes), "=&r" (lsize)
195 : "0" (addr), "1" (nbytes), "2" (lsize),
196 "i" (ASI_FLUSHSEG)
197 : "g1", "g2", "g3", "g4", "g5", "o4", "o5", "cc");
198 }
199 }
200
201 /* Don't inline the software version as it eats too many cache lines if expanded. */
202 static void sun4c_flush_page_sw(unsigned long addr)
203 {
204 addr &= PAGE_MASK;
205 if ((sun4c_get_pte(addr) & (_SUN4C_PAGE_NOCACHE | _SUN4C_PAGE_VALID)) ==
206 _SUN4C_PAGE_VALID) {
207 unsigned long left = PAGE_SIZE;
208 unsigned long lsize = sun4c_vacinfo.linesize;
209
210 __asm__ __volatile__(
211 "add %2, %2, %%g1\n\t"
212 "add %2, %%g1, %%g2\n\t"
213 "add %2, %%g2, %%g3\n\t"
214 "add %2, %%g3, %%g4\n\t"
215 "add %2, %%g4, %%g5\n\t"
216 "add %2, %%g5, %%o4\n\t"
217 "add %2, %%o4, %%o5\n"
218 "1:\n\t"
219 "subcc %1, %%o5, %1\n\t"
220 "sta %%g0, [%0] %6\n\t"
221 "sta %%g0, [%0 + %2] %6\n\t"
222 "sta %%g0, [%0 + %%g1] %6\n\t"
223 "sta %%g0, [%0 + %%g2] %6\n\t"
224 "sta %%g0, [%0 + %%g3] %6\n\t"
225 "sta %%g0, [%0 + %%g4] %6\n\t"
226 "sta %%g0, [%0 + %%g5] %6\n\t"
227 "sta %%g0, [%0 + %%o4] %6\n\t"
228 "bg 1b\n\t"
229 " add %0, %%o5, %0\n"
230 : "=&r" (addr), "=&r" (left), "=&r" (lsize)
231 : "0" (addr), "1" (left), "2" (lsize),
232 "i" (ASI_FLUSHPG)
233 : "g1", "g2", "g3", "g4", "g5", "o4", "o5", "cc");
234 }
235 }
236
237 /* The sun4c's do have an on chip store buffer. And the way you
238 * clear them out isn't so obvious. The only way I can think of
239 * to accomplish this is to read the current context register,
240 * store the same value there, then read an external hardware
241 * register.
242 */
243 void sun4c_complete_all_stores(void)
244 {
245 volatile int _unused;
246
247 _unused = sun4c_get_context();
248 sun4c_set_context(_unused);
249 #ifdef CONFIG_SUN_AUXIO
250 _unused = get_auxio();
251 #endif
252 }
253
254 /* Bootup utility functions. */
255 static inline void sun4c_init_clean_segmap(unsigned char pseg)
256 {
257 unsigned long vaddr;
258
259 sun4c_put_segmap(0, pseg);
260 for (vaddr = 0; vaddr < SUN4C_REAL_PGDIR_SIZE; vaddr += PAGE_SIZE)
261 sun4c_put_pte(vaddr, 0);
262 sun4c_put_segmap(0, invalid_segment);
263 }
264
265 static inline void sun4c_init_clean_mmu(unsigned long kernel_end)
266 {
267 unsigned long vaddr;
268 unsigned char savectx, ctx;
269
270 savectx = sun4c_get_context();
271 kernel_end = SUN4C_REAL_PGDIR_ALIGN(kernel_end);
272 for (ctx = 0; ctx < num_contexts; ctx++) {
273 sun4c_set_context(ctx);
274 for (vaddr = 0; vaddr < 0x20000000; vaddr += SUN4C_REAL_PGDIR_SIZE)
275 sun4c_put_segmap(vaddr, invalid_segment);
276 for (vaddr = 0xe0000000; vaddr < KERNBASE; vaddr += SUN4C_REAL_PGDIR_SIZE)
277 sun4c_put_segmap(vaddr, invalid_segment);
278 for (vaddr = kernel_end; vaddr < KADB_DEBUGGER_BEGVM; vaddr += SUN4C_REAL_PGDIR_SIZE)
279 sun4c_put_segmap(vaddr, invalid_segment);
280 for (vaddr = LINUX_OPPROM_ENDVM; vaddr; vaddr += SUN4C_REAL_PGDIR_SIZE)
281 sun4c_put_segmap(vaddr, invalid_segment);
282 }
283 sun4c_set_context(savectx);
284 }
285
286 void __init sun4c_probe_vac(void)
287 {
288 sun4c_disable_vac();
289
290 if (ARCH_SUN4) {
291 switch (idprom->id_machtype) {
292
293 case (SM_SUN4|SM_4_110):
294 sun4c_vacinfo.type = VAC_NONE;
295 sun4c_vacinfo.num_bytes = 0;
296 sun4c_vacinfo.linesize = 0;
297 sun4c_vacinfo.do_hwflushes = 0;
298 prom_printf("No VAC. Get some bucks and buy a real computer.");
299 prom_halt();
300 break;
301
302 case (SM_SUN4|SM_4_260):
303 sun4c_vacinfo.type = VAC_WRITE_BACK;
304 sun4c_vacinfo.num_bytes = 128 * 1024;
305 sun4c_vacinfo.linesize = 16;
306 sun4c_vacinfo.do_hwflushes = 0;
307 break;
308
309 case (SM_SUN4|SM_4_330):
310 sun4c_vacinfo.type = VAC_WRITE_THROUGH;
311 sun4c_vacinfo.num_bytes = 128 * 1024;
312 sun4c_vacinfo.linesize = 16;
313 sun4c_vacinfo.do_hwflushes = 0;
314 break;
315
316 case (SM_SUN4|SM_4_470):
317 sun4c_vacinfo.type = VAC_WRITE_BACK;
318 sun4c_vacinfo.num_bytes = 128 * 1024;
319 sun4c_vacinfo.linesize = 32;
320 sun4c_vacinfo.do_hwflushes = 0;
321 break;
322
323 default:
324 prom_printf("Cannot initialize VAC - weird sun4 model idprom->id_machtype = %d", idprom->id_machtype);
325 prom_halt();
326 };
327 } else {
328 sun4c_vacinfo.type = VAC_WRITE_THROUGH;
329
330 if ((idprom->id_machtype == (SM_SUN4C | SM_4C_SS1)) ||
331 (idprom->id_machtype == (SM_SUN4C | SM_4C_SS1PLUS))) {
332 /* PROM on SS1 lacks this info, to be super safe we
333 * hard code it here since this arch is cast in stone.
334 */
335 sun4c_vacinfo.num_bytes = 65536;
336 sun4c_vacinfo.linesize = 16;
337 } else {
338 sun4c_vacinfo.num_bytes =
339 prom_getintdefault(prom_root_node, "vac-size", 65536);
340 sun4c_vacinfo.linesize =
341 prom_getintdefault(prom_root_node, "vac-linesize", 16);
342 }
343 sun4c_vacinfo.do_hwflushes =
344 prom_getintdefault(prom_root_node, "vac-hwflush", 0);
345
346 if (sun4c_vacinfo.do_hwflushes == 0)
347 sun4c_vacinfo.do_hwflushes =
348 prom_getintdefault(prom_root_node, "vac_hwflush", 0);
349
350 if (sun4c_vacinfo.num_bytes != 65536) {
351 prom_printf("WEIRD Sun4C VAC cache size, "
352 "tell sparclinux@vger.kernel.org");
353 prom_halt();
354 }
355 }
356
357 sun4c_vacinfo.num_lines =
358 (sun4c_vacinfo.num_bytes / sun4c_vacinfo.linesize);
359 switch (sun4c_vacinfo.linesize) {
360 case 16:
361 sun4c_vacinfo.log2lsize = 4;
362 break;
363 case 32:
364 sun4c_vacinfo.log2lsize = 5;
365 break;
366 default:
367 prom_printf("probe_vac: Didn't expect vac-linesize of %d, halting\n",
368 sun4c_vacinfo.linesize);
369 prom_halt();
370 };
371
372 sun4c_flush_all();
373 sun4c_enable_vac();
374 }
375
376 /* Patch instructions for the low level kernel fault handler. */
377 extern unsigned long invalid_segment_patch1, invalid_segment_patch1_ff;
378 extern unsigned long invalid_segment_patch2, invalid_segment_patch2_ff;
379 extern unsigned long invalid_segment_patch1_1ff, invalid_segment_patch2_1ff;
380 extern unsigned long num_context_patch1, num_context_patch1_16;
381 extern unsigned long num_context_patch2_16;
382 extern unsigned long vac_linesize_patch, vac_linesize_patch_32;
383 extern unsigned long vac_hwflush_patch1, vac_hwflush_patch1_on;
384 extern unsigned long vac_hwflush_patch2, vac_hwflush_patch2_on;
385
386 #define PATCH_INSN(src, dst) do { \
387 daddr = &(dst); \
388 iaddr = &(src); \
389 *daddr = *iaddr; \
390 } while (0)
391
392 static void __init patch_kernel_fault_handler(void)
393 {
394 unsigned long *iaddr, *daddr;
395
396 switch (num_segmaps) {
397 case 128:
398 /* Default, nothing to do. */
399 break;
400 case 256:
401 PATCH_INSN(invalid_segment_patch1_ff,
402 invalid_segment_patch1);
403 PATCH_INSN(invalid_segment_patch2_ff,
404 invalid_segment_patch2);
405 break;
406 case 512:
407 PATCH_INSN(invalid_segment_patch1_1ff,
408 invalid_segment_patch1);
409 PATCH_INSN(invalid_segment_patch2_1ff,
410 invalid_segment_patch2);
411 break;
412 default:
413 prom_printf("Unhandled number of segmaps: %d\n",
414 num_segmaps);
415 prom_halt();
416 };
417 switch (num_contexts) {
418 case 8:
419 /* Default, nothing to do. */
420 break;
421 case 16:
422 PATCH_INSN(num_context_patch1_16,
423 num_context_patch1);
424 break;
425 default:
426 prom_printf("Unhandled number of contexts: %d\n",
427 num_contexts);
428 prom_halt();
429 };
430
431 if (sun4c_vacinfo.do_hwflushes != 0) {
432 PATCH_INSN(vac_hwflush_patch1_on, vac_hwflush_patch1);
433 PATCH_INSN(vac_hwflush_patch2_on, vac_hwflush_patch2);
434 } else {
435 switch (sun4c_vacinfo.linesize) {
436 case 16:
437 /* Default, nothing to do. */
438 break;
439 case 32:
440 PATCH_INSN(vac_linesize_patch_32, vac_linesize_patch);
441 break;
442 default:
443 prom_printf("Impossible VAC linesize %d, halting...\n",
444 sun4c_vacinfo.linesize);
445 prom_halt();
446 };
447 }
448 }
449
450 static void __init sun4c_probe_mmu(void)
451 {
452 if (ARCH_SUN4) {
453 switch (idprom->id_machtype) {
454 case (SM_SUN4|SM_4_110):
455 prom_printf("No support for 4100 yet\n");
456 prom_halt();
457 num_segmaps = 256;
458 num_contexts = 8;
459 break;
460
461 case (SM_SUN4|SM_4_260):
462 /* should be 512 segmaps. when it get fixed */
463 num_segmaps = 256;
464 num_contexts = 16;
465 break;
466
467 case (SM_SUN4|SM_4_330):
468 num_segmaps = 256;
469 num_contexts = 16;
470 break;
471
472 case (SM_SUN4|SM_4_470):
473 /* should be 1024 segmaps. when it get fixed */
474 num_segmaps = 256;
475 num_contexts = 64;
476 break;
477 default:
478 prom_printf("Invalid SUN4 model\n");
479 prom_halt();
480 };
481 } else {
482 if ((idprom->id_machtype == (SM_SUN4C | SM_4C_SS1)) ||
483 (idprom->id_machtype == (SM_SUN4C | SM_4C_SS1PLUS))) {
484 /* Hardcode these just to be safe, PROM on SS1 does
485 * not have this info available in the root node.
486 */
487 num_segmaps = 128;
488 num_contexts = 8;
489 } else {
490 num_segmaps =
491 prom_getintdefault(prom_root_node, "mmu-npmg", 128);
492 num_contexts =
493 prom_getintdefault(prom_root_node, "mmu-nctx", 0x8);
494 }
495 }
496 patch_kernel_fault_handler();
497 }
498
499 volatile unsigned long __iomem *sun4c_memerr_reg = NULL;
500
501 void __init sun4c_probe_memerr_reg(void)
502 {
503 int node;
504 struct linux_prom_registers regs[1];
505
506 if (ARCH_SUN4) {
507 sun4c_memerr_reg = ioremap(sun4_memreg_physaddr, PAGE_SIZE);
508 } else {
509 node = prom_getchild(prom_root_node);
510 node = prom_searchsiblings(prom_root_node, "memory-error");
511 if (!node)
512 return;
513 if (prom_getproperty(node, "reg", (char *)regs, sizeof(regs)) <= 0)
514 return;
515 /* hmm I think regs[0].which_io is zero here anyways */
516 sun4c_memerr_reg = ioremap(regs[0].phys_addr, regs[0].reg_size);
517 }
518 }
519
520 static inline void sun4c_init_ss2_cache_bug(void)
521 {
522 extern unsigned long start;
523
524 if ((idprom->id_machtype == (SM_SUN4C | SM_4C_SS2)) ||
525 (idprom->id_machtype == (SM_SUN4C | SM_4C_IPX)) ||
526 (idprom->id_machtype == (SM_SUN4 | SM_4_330)) ||
527 (idprom->id_machtype == (SM_SUN4C | SM_4C_ELC))) {
528 /* Whee.. */
529 printk("SS2 cache bug detected, uncaching trap table page\n");
530 sun4c_flush_page((unsigned int) &start);
531 sun4c_put_pte(((unsigned long) &start),
532 (sun4c_get_pte((unsigned long) &start) | _SUN4C_PAGE_NOCACHE));
533 }
534 }
535
536 /* Addr is always aligned on a page boundary for us already. */
537 static int sun4c_map_dma_area(dma_addr_t *pba, unsigned long va,
538 unsigned long addr, int len)
539 {
540 unsigned long page, end;
541
542 *pba = addr;
543
544 end = PAGE_ALIGN((addr + len));
545 while (addr < end) {
546 page = va;
547 sun4c_flush_page(page);
548 page -= PAGE_OFFSET;
549 page >>= PAGE_SHIFT;
550 page |= (_SUN4C_PAGE_VALID | _SUN4C_PAGE_DIRTY |
551 _SUN4C_PAGE_NOCACHE | _SUN4C_PAGE_PRIV);
552 sun4c_put_pte(addr, page);
553 addr += PAGE_SIZE;
554 va += PAGE_SIZE;
555 }
556
557 return 0;
558 }
559
560 static struct page *sun4c_translate_dvma(unsigned long busa)
561 {
562 /* Fortunately for us, bus_addr == uncached_virt in sun4c. */
563 unsigned long pte = sun4c_get_pte(busa);
564 return pfn_to_page(pte & SUN4C_PFN_MASK);
565 }
566
567 static void sun4c_unmap_dma_area(unsigned long busa, int len)
568 {
569 /* Fortunately for us, bus_addr == uncached_virt in sun4c. */
570 /* XXX Implement this */
571 }
572
573 /* TLB management. */
574
575 /* Don't change this struct without changing entry.S. This is used
576 * in the in-window kernel fault handler, and you don't want to mess
577 * with that. (See sun4c_fault in entry.S).
578 */
579 struct sun4c_mmu_entry {
580 struct sun4c_mmu_entry *next;
581 struct sun4c_mmu_entry *prev;
582 unsigned long vaddr;
583 unsigned char pseg;
584 unsigned char locked;
585
586 /* For user mappings only, and completely hidden from kernel
587 * TLB miss code.
588 */
589 unsigned char ctx;
590 struct sun4c_mmu_entry *lru_next;
591 struct sun4c_mmu_entry *lru_prev;
592 };
593
594 static struct sun4c_mmu_entry mmu_entry_pool[SUN4C_MAX_SEGMAPS];
595
596 static void __init sun4c_init_mmu_entry_pool(void)
597 {
598 int i;
599
600 for (i=0; i < SUN4C_MAX_SEGMAPS; i++) {
601 mmu_entry_pool[i].pseg = i;
602 mmu_entry_pool[i].next = NULL;
603 mmu_entry_pool[i].prev = NULL;
604 mmu_entry_pool[i].vaddr = 0;
605 mmu_entry_pool[i].locked = 0;
606 mmu_entry_pool[i].ctx = 0;
607 mmu_entry_pool[i].lru_next = NULL;
608 mmu_entry_pool[i].lru_prev = NULL;
609 }
610 mmu_entry_pool[invalid_segment].locked = 1;
611 }
612
613 static inline void fix_permissions(unsigned long vaddr, unsigned long bits_on,
614 unsigned long bits_off)
615 {
616 unsigned long start, end;
617
618 end = vaddr + SUN4C_REAL_PGDIR_SIZE;
619 for (start = vaddr; start < end; start += PAGE_SIZE)
620 if (sun4c_get_pte(start) & _SUN4C_PAGE_VALID)
621 sun4c_put_pte(start, (sun4c_get_pte(start) | bits_on) &
622 ~bits_off);
623 }
624
625 static inline void sun4c_init_map_kernelprom(unsigned long kernel_end)
626 {
627 unsigned long vaddr;
628 unsigned char pseg, ctx;
629 #ifdef CONFIG_SUN4
630 /* sun4/110 and 260 have no kadb. */
631 if ((idprom->id_machtype != (SM_SUN4 | SM_4_260)) &&
632 (idprom->id_machtype != (SM_SUN4 | SM_4_110))) {
633 #endif
634 for (vaddr = KADB_DEBUGGER_BEGVM;
635 vaddr < LINUX_OPPROM_ENDVM;
636 vaddr += SUN4C_REAL_PGDIR_SIZE) {
637 pseg = sun4c_get_segmap(vaddr);
638 if (pseg != invalid_segment) {
639 mmu_entry_pool[pseg].locked = 1;
640 for (ctx = 0; ctx < num_contexts; ctx++)
641 prom_putsegment(ctx, vaddr, pseg);
642 fix_permissions(vaddr, _SUN4C_PAGE_PRIV, 0);
643 }
644 }
645 #ifdef CONFIG_SUN4
646 }
647 #endif
648 for (vaddr = KERNBASE; vaddr < kernel_end; vaddr += SUN4C_REAL_PGDIR_SIZE) {
649 pseg = sun4c_get_segmap(vaddr);
650 mmu_entry_pool[pseg].locked = 1;
651 for (ctx = 0; ctx < num_contexts; ctx++)
652 prom_putsegment(ctx, vaddr, pseg);
653 fix_permissions(vaddr, _SUN4C_PAGE_PRIV, _SUN4C_PAGE_NOCACHE);
654 }
655 }
656
657 static void __init sun4c_init_lock_area(unsigned long start, unsigned long end)
658 {
659 int i, ctx;
660
661 while (start < end) {
662 for (i = 0; i < invalid_segment; i++)
663 if (!mmu_entry_pool[i].locked)
664 break;
665 mmu_entry_pool[i].locked = 1;
666 sun4c_init_clean_segmap(i);
667 for (ctx = 0; ctx < num_contexts; ctx++)
668 prom_putsegment(ctx, start, mmu_entry_pool[i].pseg);
669 start += SUN4C_REAL_PGDIR_SIZE;
670 }
671 }
672
673 /* Don't change this struct without changing entry.S. This is used
674 * in the in-window kernel fault handler, and you don't want to mess
675 * with that. (See sun4c_fault in entry.S).
676 */
677 struct sun4c_mmu_ring {
678 struct sun4c_mmu_entry ringhd;
679 int num_entries;
680 };
681
682 static struct sun4c_mmu_ring sun4c_context_ring[SUN4C_MAX_CONTEXTS]; /* used user entries */
683 static struct sun4c_mmu_ring sun4c_ufree_ring; /* free user entries */
684 static struct sun4c_mmu_ring sun4c_ulru_ring; /* LRU user entries */
685 struct sun4c_mmu_ring sun4c_kernel_ring; /* used kernel entries */
686 struct sun4c_mmu_ring sun4c_kfree_ring; /* free kernel entries */
687
688 static inline void sun4c_init_rings(void)
689 {
690 int i;
691
692 for (i = 0; i < SUN4C_MAX_CONTEXTS; i++) {
693 sun4c_context_ring[i].ringhd.next =
694 sun4c_context_ring[i].ringhd.prev =
695 &sun4c_context_ring[i].ringhd;
696 sun4c_context_ring[i].num_entries = 0;
697 }
698 sun4c_ufree_ring.ringhd.next = sun4c_ufree_ring.ringhd.prev =
699 &sun4c_ufree_ring.ringhd;
700 sun4c_ufree_ring.num_entries = 0;
701 sun4c_ulru_ring.ringhd.lru_next = sun4c_ulru_ring.ringhd.lru_prev =
702 &sun4c_ulru_ring.ringhd;
703 sun4c_ulru_ring.num_entries = 0;
704 sun4c_kernel_ring.ringhd.next = sun4c_kernel_ring.ringhd.prev =
705 &sun4c_kernel_ring.ringhd;
706 sun4c_kernel_ring.num_entries = 0;
707 sun4c_kfree_ring.ringhd.next = sun4c_kfree_ring.ringhd.prev =
708 &sun4c_kfree_ring.ringhd;
709 sun4c_kfree_ring.num_entries = 0;
710 }
711
712 static void add_ring(struct sun4c_mmu_ring *ring,
713 struct sun4c_mmu_entry *entry)
714 {
715 struct sun4c_mmu_entry *head = &ring->ringhd;
716
717 entry->prev = head;
718 (entry->next = head->next)->prev = entry;
719 head->next = entry;
720 ring->num_entries++;
721 }
722
723 static __inline__ void add_lru(struct sun4c_mmu_entry *entry)
724 {
725 struct sun4c_mmu_ring *ring = &sun4c_ulru_ring;
726 struct sun4c_mmu_entry *head = &ring->ringhd;
727
728 entry->lru_next = head;
729 (entry->lru_prev = head->lru_prev)->lru_next = entry;
730 head->lru_prev = entry;
731 }
732
733 static void add_ring_ordered(struct sun4c_mmu_ring *ring,
734 struct sun4c_mmu_entry *entry)
735 {
736 struct sun4c_mmu_entry *head = &ring->ringhd;
737 unsigned long addr = entry->vaddr;
738
739 while ((head->next != &ring->ringhd) && (head->next->vaddr < addr))
740 head = head->next;
741
742 entry->prev = head;
743 (entry->next = head->next)->prev = entry;
744 head->next = entry;
745 ring->num_entries++;
746
747 add_lru(entry);
748 }
749
750 static __inline__ void remove_ring(struct sun4c_mmu_ring *ring,
751 struct sun4c_mmu_entry *entry)
752 {
753 struct sun4c_mmu_entry *next = entry->next;
754
755 (next->prev = entry->prev)->next = next;
756 ring->num_entries--;
757 }
758
759 static void remove_lru(struct sun4c_mmu_entry *entry)
760 {
761 struct sun4c_mmu_entry *next = entry->lru_next;
762
763 (next->lru_prev = entry->lru_prev)->lru_next = next;
764 }
765
766 static void free_user_entry(int ctx, struct sun4c_mmu_entry *entry)
767 {
768 remove_ring(sun4c_context_ring+ctx, entry);
769 remove_lru(entry);
770 add_ring(&sun4c_ufree_ring, entry);
771 }
772
773 static void free_kernel_entry(struct sun4c_mmu_entry *entry,
774 struct sun4c_mmu_ring *ring)
775 {
776 remove_ring(ring, entry);
777 add_ring(&sun4c_kfree_ring, entry);
778 }
779
780 static void __init sun4c_init_fill_kernel_ring(int howmany)
781 {
782 int i;
783
784 while (howmany) {
785 for (i = 0; i < invalid_segment; i++)
786 if (!mmu_entry_pool[i].locked)
787 break;
788 mmu_entry_pool[i].locked = 1;
789 sun4c_init_clean_segmap(i);
790 add_ring(&sun4c_kfree_ring, &mmu_entry_pool[i]);
791 howmany--;
792 }
793 }
794
795 static void __init sun4c_init_fill_user_ring(void)
796 {
797 int i;
798
799 for (i = 0; i < invalid_segment; i++) {
800 if (mmu_entry_pool[i].locked)
801 continue;
802 sun4c_init_clean_segmap(i);
803 add_ring(&sun4c_ufree_ring, &mmu_entry_pool[i]);
804 }
805 }
806
807 static void sun4c_kernel_unmap(struct sun4c_mmu_entry *kentry)
808 {
809 int savectx, ctx;
810
811 savectx = sun4c_get_context();
812 for (ctx = 0; ctx < num_contexts; ctx++) {
813 sun4c_set_context(ctx);
814 sun4c_put_segmap(kentry->vaddr, invalid_segment);
815 }
816 sun4c_set_context(savectx);
817 }
818
819 static void sun4c_kernel_map(struct sun4c_mmu_entry *kentry)
820 {
821 int savectx, ctx;
822
823 savectx = sun4c_get_context();
824 for (ctx = 0; ctx < num_contexts; ctx++) {
825 sun4c_set_context(ctx);
826 sun4c_put_segmap(kentry->vaddr, kentry->pseg);
827 }
828 sun4c_set_context(savectx);
829 }
830
831 #define sun4c_user_unmap(__entry) \
832 sun4c_put_segmap((__entry)->vaddr, invalid_segment)
833
834 static void sun4c_demap_context(struct sun4c_mmu_ring *crp, unsigned char ctx)
835 {
836 struct sun4c_mmu_entry *head = &crp->ringhd;
837 unsigned long flags;
838
839 local_irq_save(flags);
840 if (head->next != head) {
841 struct sun4c_mmu_entry *entry = head->next;
842 int savectx = sun4c_get_context();
843
844 flush_user_windows();
845 sun4c_set_context(ctx);
846 sun4c_flush_context();
847 do {
848 struct sun4c_mmu_entry *next = entry->next;
849
850 sun4c_user_unmap(entry);
851 free_user_entry(ctx, entry);
852
853 entry = next;
854 } while (entry != head);
855 sun4c_set_context(savectx);
856 }
857 local_irq_restore(flags);
858 }
859
860 static int sun4c_user_taken_entries; /* This is how much we have. */
861 static int max_user_taken_entries; /* This limits us and prevents deadlock. */
862
863 static struct sun4c_mmu_entry *sun4c_kernel_strategy(void)
864 {
865 struct sun4c_mmu_entry *this_entry;
866
867 /* If some are free, return first one. */
868 if (sun4c_kfree_ring.num_entries) {
869 this_entry = sun4c_kfree_ring.ringhd.next;
870 return this_entry;
871 }
872
873 /* Else free one up. */
874 this_entry = sun4c_kernel_ring.ringhd.prev;
875 sun4c_flush_segment(this_entry->vaddr);
876 sun4c_kernel_unmap(this_entry);
877 free_kernel_entry(this_entry, &sun4c_kernel_ring);
878 this_entry = sun4c_kfree_ring.ringhd.next;
879
880 return this_entry;
881 }
882
883 /* Using this method to free up mmu entries eliminates a lot of
884 * potential races since we have a kernel that incurs tlb
885 * replacement faults. There may be performance penalties.
886 *
887 * NOTE: Must be called with interrupts disabled.
888 */
889 static struct sun4c_mmu_entry *sun4c_user_strategy(void)
890 {
891 struct sun4c_mmu_entry *entry;
892 unsigned char ctx;
893 int savectx;
894
895 /* If some are free, return first one. */
896 if (sun4c_ufree_ring.num_entries) {
897 entry = sun4c_ufree_ring.ringhd.next;
898 goto unlink_out;
899 }
900
901 if (sun4c_user_taken_entries) {
902 entry = sun4c_kernel_strategy();
903 sun4c_user_taken_entries--;
904 goto kunlink_out;
905 }
906
907 /* Grab from the beginning of the LRU list. */
908 entry = sun4c_ulru_ring.ringhd.lru_next;
909 ctx = entry->ctx;
910
911 savectx = sun4c_get_context();
912 flush_user_windows();
913 sun4c_set_context(ctx);
914 sun4c_flush_segment(entry->vaddr);
915 sun4c_user_unmap(entry);
916 remove_ring(sun4c_context_ring + ctx, entry);
917 remove_lru(entry);
918 sun4c_set_context(savectx);
919
920 return entry;
921
922 unlink_out:
923 remove_ring(&sun4c_ufree_ring, entry);
924 return entry;
925 kunlink_out:
926 remove_ring(&sun4c_kfree_ring, entry);
927 return entry;
928 }
929
930 /* NOTE: Must be called with interrupts disabled. */
931 void sun4c_grow_kernel_ring(void)
932 {
933 struct sun4c_mmu_entry *entry;
934
935 /* Prevent deadlock condition. */
936 if (sun4c_user_taken_entries >= max_user_taken_entries)
937 return;
938
939 if (sun4c_ufree_ring.num_entries) {
940 entry = sun4c_ufree_ring.ringhd.next;
941 remove_ring(&sun4c_ufree_ring, entry);
942 add_ring(&sun4c_kfree_ring, entry);
943 sun4c_user_taken_entries++;
944 }
945 }
946
947 /* 2 page buckets for task struct and kernel stack allocation.
948 *
949 * TASK_STACK_BEGIN
950 * bucket[0]
951 * bucket[1]
952 * [ ... ]
953 * bucket[NR_TASK_BUCKETS-1]
954 * TASK_STACK_BEGIN + (sizeof(struct task_bucket) * NR_TASK_BUCKETS)
955 *
956 * Each slot looks like:
957 *
958 * page 1 -- task struct + beginning of kernel stack
959 * page 2 -- rest of kernel stack
960 */
961
962 union task_union *sun4c_bucket[NR_TASK_BUCKETS];
963
964 static int sun4c_lowbucket_avail;
965
966 #define BUCKET_EMPTY ((union task_union *) 0)
967 #define BUCKET_SHIFT (PAGE_SHIFT + 1) /* log2(sizeof(struct task_bucket)) */
968 #define BUCKET_SIZE (1 << BUCKET_SHIFT)
969 #define BUCKET_NUM(addr) ((((addr) - SUN4C_LOCK_VADDR) >> BUCKET_SHIFT))
970 #define BUCKET_ADDR(num) (((num) << BUCKET_SHIFT) + SUN4C_LOCK_VADDR)
971 #define BUCKET_PTE(page) \
972 ((((page) - PAGE_OFFSET) >> PAGE_SHIFT) | pgprot_val(SUN4C_PAGE_KERNEL))
973 #define BUCKET_PTE_PAGE(pte) \
974 (PAGE_OFFSET + (((pte) & SUN4C_PFN_MASK) << PAGE_SHIFT))
975
976 static void get_locked_segment(unsigned long addr)
977 {
978 struct sun4c_mmu_entry *stolen;
979 unsigned long flags;
980
981 local_irq_save(flags);
982 addr &= SUN4C_REAL_PGDIR_MASK;
983 stolen = sun4c_user_strategy();
984 max_user_taken_entries--;
985 stolen->vaddr = addr;
986 flush_user_windows();
987 sun4c_kernel_map(stolen);
988 local_irq_restore(flags);
989 }
990
991 static void free_locked_segment(unsigned long addr)
992 {
993 struct sun4c_mmu_entry *entry;
994 unsigned long flags;
995 unsigned char pseg;
996
997 local_irq_save(flags);
998 addr &= SUN4C_REAL_PGDIR_MASK;
999 pseg = sun4c_get_segmap(addr);
1000 entry = &mmu_entry_pool[pseg];
1001
1002 flush_user_windows();
1003 sun4c_flush_segment(addr);
1004 sun4c_kernel_unmap(entry);
1005 add_ring(&sun4c_ufree_ring, entry);
1006 max_user_taken_entries++;
1007 local_irq_restore(flags);
1008 }
1009
1010 static inline void garbage_collect(int entry)
1011 {
1012 int start, end;
1013
1014 /* 32 buckets per segment... */
1015 entry &= ~31;
1016 start = entry;
1017 for (end = (start + 32); start < end; start++)
1018 if (sun4c_bucket[start] != BUCKET_EMPTY)
1019 return;
1020
1021 /* Entire segment empty, release it. */
1022 free_locked_segment(BUCKET_ADDR(entry));
1023 }
1024
1025 static struct thread_info *sun4c_alloc_thread_info(void)
1026 {
1027 unsigned long addr, pages;
1028 int entry;
1029
1030 pages = __get_free_pages(GFP_KERNEL, THREAD_INFO_ORDER);
1031 if (!pages)
1032 return NULL;
1033
1034 for (entry = sun4c_lowbucket_avail; entry < NR_TASK_BUCKETS; entry++)
1035 if (sun4c_bucket[entry] == BUCKET_EMPTY)
1036 break;
1037 if (entry == NR_TASK_BUCKETS) {
1038 free_pages(pages, THREAD_INFO_ORDER);
1039 return NULL;
1040 }
1041 if (entry >= sun4c_lowbucket_avail)
1042 sun4c_lowbucket_avail = entry + 1;
1043
1044 addr = BUCKET_ADDR(entry);
1045 sun4c_bucket[entry] = (union task_union *) addr;
1046 if(sun4c_get_segmap(addr) == invalid_segment)
1047 get_locked_segment(addr);
1048
1049 /* We are changing the virtual color of the page(s)
1050 * so we must flush the cache to guarantee consistency.
1051 */
1052 sun4c_flush_page(pages);
1053 #ifndef CONFIG_SUN4
1054 sun4c_flush_page(pages + PAGE_SIZE);
1055 #endif
1056
1057 sun4c_put_pte(addr, BUCKET_PTE(pages));
1058 #ifndef CONFIG_SUN4
1059 sun4c_put_pte(addr + PAGE_SIZE, BUCKET_PTE(pages + PAGE_SIZE));
1060 #endif
1061
1062 #ifdef CONFIG_DEBUG_STACK_USAGE
1063 memset((void *)addr, 0, PAGE_SIZE << THREAD_INFO_ORDER);
1064 #endif /* DEBUG_STACK_USAGE */
1065
1066 return (struct thread_info *) addr;
1067 }
1068
1069 static void sun4c_free_thread_info(struct thread_info *ti)
1070 {
1071 unsigned long tiaddr = (unsigned long) ti;
1072 unsigned long pages = BUCKET_PTE_PAGE(sun4c_get_pte(tiaddr));
1073 int entry = BUCKET_NUM(tiaddr);
1074
1075 /* We are deleting a mapping, so the flush here is mandatory. */
1076 sun4c_flush_page(tiaddr);
1077 #ifndef CONFIG_SUN4
1078 sun4c_flush_page(tiaddr + PAGE_SIZE);
1079 #endif
1080 sun4c_put_pte(tiaddr, 0);
1081 #ifndef CONFIG_SUN4
1082 sun4c_put_pte(tiaddr + PAGE_SIZE, 0);
1083 #endif
1084 sun4c_bucket[entry] = BUCKET_EMPTY;
1085 if (entry < sun4c_lowbucket_avail)
1086 sun4c_lowbucket_avail = entry;
1087
1088 free_pages(pages, THREAD_INFO_ORDER);
1089 garbage_collect(entry);
1090 }
1091
1092 static void __init sun4c_init_buckets(void)
1093 {
1094 int entry;
1095
1096 if (sizeof(union thread_union) != (PAGE_SIZE << THREAD_INFO_ORDER)) {
1097 extern void thread_info_size_is_bolixed_pete(void);
1098 thread_info_size_is_bolixed_pete();
1099 }
1100
1101 for (entry = 0; entry < NR_TASK_BUCKETS; entry++)
1102 sun4c_bucket[entry] = BUCKET_EMPTY;
1103 sun4c_lowbucket_avail = 0;
1104 }
1105
1106 static unsigned long sun4c_iobuffer_start;
1107 static unsigned long sun4c_iobuffer_end;
1108 static unsigned long sun4c_iobuffer_high;
1109 static unsigned long *sun4c_iobuffer_map;
1110 static int iobuffer_map_size;
1111
1112 /*
1113 * Alias our pages so they do not cause a trap.
1114 * Also one page may be aliased into several I/O areas and we may
1115 * finish these I/O separately.
1116 */
1117 static char *sun4c_lockarea(char *vaddr, unsigned long size)
1118 {
1119 unsigned long base, scan;
1120 unsigned long npages;
1121 unsigned long vpage;
1122 unsigned long pte;
1123 unsigned long apage;
1124 unsigned long high;
1125 unsigned long flags;
1126
1127 npages = (((unsigned long)vaddr & ~PAGE_MASK) +
1128 size + (PAGE_SIZE-1)) >> PAGE_SHIFT;
1129
1130 scan = 0;
1131 local_irq_save(flags);
1132 for (;;) {
1133 scan = find_next_zero_bit(sun4c_iobuffer_map,
1134 iobuffer_map_size, scan);
1135 if ((base = scan) + npages > iobuffer_map_size) goto abend;
1136 for (;;) {
1137 if (scan >= base + npages) goto found;
1138 if (test_bit(scan, sun4c_iobuffer_map)) break;
1139 scan++;
1140 }
1141 }
1142
1143 found:
1144 high = ((base + npages) << PAGE_SHIFT) + sun4c_iobuffer_start;
1145 high = SUN4C_REAL_PGDIR_ALIGN(high);
1146 while (high > sun4c_iobuffer_high) {
1147 get_locked_segment(sun4c_iobuffer_high);
1148 sun4c_iobuffer_high += SUN4C_REAL_PGDIR_SIZE;
1149 }
1150
1151 vpage = ((unsigned long) vaddr) & PAGE_MASK;
1152 for (scan = base; scan < base+npages; scan++) {
1153 pte = ((vpage-PAGE_OFFSET) >> PAGE_SHIFT);
1154 pte |= pgprot_val(SUN4C_PAGE_KERNEL);
1155 pte |= _SUN4C_PAGE_NOCACHE;
1156 set_bit(scan, sun4c_iobuffer_map);
1157 apage = (scan << PAGE_SHIFT) + sun4c_iobuffer_start;
1158
1159 /* Flush original mapping so we see the right things later. */
1160 sun4c_flush_page(vpage);
1161
1162 sun4c_put_pte(apage, pte);
1163 vpage += PAGE_SIZE;
1164 }
1165 local_irq_restore(flags);
1166 return (char *) ((base << PAGE_SHIFT) + sun4c_iobuffer_start +
1167 (((unsigned long) vaddr) & ~PAGE_MASK));
1168
1169 abend:
1170 local_irq_restore(flags);
1171 printk("DMA vaddr=0x%p size=%08lx\n", vaddr, size);
1172 panic("Out of iobuffer table");
1173 return NULL;
1174 }
1175
1176 static void sun4c_unlockarea(char *vaddr, unsigned long size)
1177 {
1178 unsigned long vpage, npages;
1179 unsigned long flags;
1180 int scan, high;
1181
1182 vpage = (unsigned long)vaddr & PAGE_MASK;
1183 npages = (((unsigned long)vaddr & ~PAGE_MASK) +
1184 size + (PAGE_SIZE-1)) >> PAGE_SHIFT;
1185
1186 local_irq_save(flags);
1187 while (npages != 0) {
1188 --npages;
1189
1190 /* This mapping is marked non-cachable, no flush necessary. */
1191 sun4c_put_pte(vpage, 0);
1192 clear_bit((vpage - sun4c_iobuffer_start) >> PAGE_SHIFT,
1193 sun4c_iobuffer_map);
1194 vpage += PAGE_SIZE;
1195 }
1196
1197 /* garbage collect */
1198 scan = (sun4c_iobuffer_high - sun4c_iobuffer_start) >> PAGE_SHIFT;
1199 while (scan >= 0 && !sun4c_iobuffer_map[scan >> 5])
1200 scan -= 32;
1201 scan += 32;
1202 high = sun4c_iobuffer_start + (scan << PAGE_SHIFT);
1203 high = SUN4C_REAL_PGDIR_ALIGN(high) + SUN4C_REAL_PGDIR_SIZE;
1204 while (high < sun4c_iobuffer_high) {
1205 sun4c_iobuffer_high -= SUN4C_REAL_PGDIR_SIZE;
1206 free_locked_segment(sun4c_iobuffer_high);
1207 }
1208 local_irq_restore(flags);
1209 }
1210
1211 /* Note the scsi code at init time passes to here buffers
1212 * which sit on the kernel stack, those are already locked
1213 * by implication and fool the page locking code above
1214 * if passed to by mistake.
1215 */
1216 static __u32 sun4c_get_scsi_one(char *bufptr, unsigned long len, struct sbus_bus *sbus)
1217 {
1218 unsigned long page;
1219
1220 page = ((unsigned long)bufptr) & PAGE_MASK;
1221 if (!virt_addr_valid(page)) {
1222 sun4c_flush_page(page);
1223 return (__u32)bufptr; /* already locked */
1224 }
1225 return (__u32)sun4c_lockarea(bufptr, len);
1226 }
1227
1228 static void sun4c_get_scsi_sgl(struct scatterlist *sg, int sz, struct sbus_bus *sbus)
1229 {
1230 while (sz != 0) {
1231 --sz;
1232 sg[sz].dvma_address = (__u32)sun4c_lockarea(page_address(sg[sz].page) + sg[sz].offset, sg[sz].length);
1233 sg[sz].dvma_length = sg[sz].length;
1234 }
1235 }
1236
1237 static void sun4c_release_scsi_one(__u32 bufptr, unsigned long len, struct sbus_bus *sbus)
1238 {
1239 if (bufptr < sun4c_iobuffer_start)
1240 return; /* On kernel stack or similar, see above */
1241 sun4c_unlockarea((char *)bufptr, len);
1242 }
1243
1244 static void sun4c_release_scsi_sgl(struct scatterlist *sg, int sz, struct sbus_bus *sbus)
1245 {
1246 while (sz != 0) {
1247 --sz;
1248 sun4c_unlockarea((char *)sg[sz].dvma_address, sg[sz].length);
1249 }
1250 }
1251
1252 #define TASK_ENTRY_SIZE BUCKET_SIZE /* see above */
1253 #define LONG_ALIGN(x) (((x)+(sizeof(long))-1)&~((sizeof(long))-1))
1254
1255 struct vm_area_struct sun4c_kstack_vma;
1256
1257 static void __init sun4c_init_lock_areas(void)
1258 {
1259 unsigned long sun4c_taskstack_start;
1260 unsigned long sun4c_taskstack_end;
1261 int bitmap_size;
1262
1263 sun4c_init_buckets();
1264 sun4c_taskstack_start = SUN4C_LOCK_VADDR;
1265 sun4c_taskstack_end = (sun4c_taskstack_start +
1266 (TASK_ENTRY_SIZE * NR_TASK_BUCKETS));
1267 if (sun4c_taskstack_end >= SUN4C_LOCK_END) {
1268 prom_printf("Too many tasks, decrease NR_TASK_BUCKETS please.\n");
1269 prom_halt();
1270 }
1271
1272 sun4c_iobuffer_start = sun4c_iobuffer_high =
1273 SUN4C_REAL_PGDIR_ALIGN(sun4c_taskstack_end);
1274 sun4c_iobuffer_end = SUN4C_LOCK_END;
1275 bitmap_size = (sun4c_iobuffer_end - sun4c_iobuffer_start) >> PAGE_SHIFT;
1276 bitmap_size = (bitmap_size + 7) >> 3;
1277 bitmap_size = LONG_ALIGN(bitmap_size);
1278 iobuffer_map_size = bitmap_size << 3;
1279 sun4c_iobuffer_map = __alloc_bootmem(bitmap_size, SMP_CACHE_BYTES, 0UL);
1280 memset((void *) sun4c_iobuffer_map, 0, bitmap_size);
1281
1282 sun4c_kstack_vma.vm_mm = &init_mm;
1283 sun4c_kstack_vma.vm_start = sun4c_taskstack_start;
1284 sun4c_kstack_vma.vm_end = sun4c_taskstack_end;
1285 sun4c_kstack_vma.vm_page_prot = PAGE_SHARED;
1286 sun4c_kstack_vma.vm_flags = VM_READ | VM_WRITE | VM_EXEC;
1287 insert_vm_struct(&init_mm, &sun4c_kstack_vma);
1288 }
1289
1290 /* Cache flushing on the sun4c. */
1291 static void sun4c_flush_cache_all(void)
1292 {
1293 unsigned long begin, end;
1294
1295 flush_user_windows();
1296 begin = (KERNBASE + SUN4C_REAL_PGDIR_SIZE);
1297 end = (begin + SUN4C_VAC_SIZE);
1298
1299 if (sun4c_vacinfo.linesize == 32) {
1300 while (begin < end) {
1301 __asm__ __volatile__(
1302 "ld [%0 + 0x00], %%g0\n\t"
1303 "ld [%0 + 0x20], %%g0\n\t"
1304 "ld [%0 + 0x40], %%g0\n\t"
1305 "ld [%0 + 0x60], %%g0\n\t"
1306 "ld [%0 + 0x80], %%g0\n\t"
1307 "ld [%0 + 0xa0], %%g0\n\t"
1308 "ld [%0 + 0xc0], %%g0\n\t"
1309 "ld [%0 + 0xe0], %%g0\n\t"
1310 "ld [%0 + 0x100], %%g0\n\t"
1311 "ld [%0 + 0x120], %%g0\n\t"
1312 "ld [%0 + 0x140], %%g0\n\t"
1313 "ld [%0 + 0x160], %%g0\n\t"
1314 "ld [%0 + 0x180], %%g0\n\t"
1315 "ld [%0 + 0x1a0], %%g0\n\t"
1316 "ld [%0 + 0x1c0], %%g0\n\t"
1317 "ld [%0 + 0x1e0], %%g0\n"
1318 : : "r" (begin));
1319 begin += 512;
1320 }
1321 } else {
1322 while (begin < end) {
1323 __asm__ __volatile__(
1324 "ld [%0 + 0x00], %%g0\n\t"
1325 "ld [%0 + 0x10], %%g0\n\t"
1326 "ld [%0 + 0x20], %%g0\n\t"
1327 "ld [%0 + 0x30], %%g0\n\t"
1328 "ld [%0 + 0x40], %%g0\n\t"
1329 "ld [%0 + 0x50], %%g0\n\t"
1330 "ld [%0 + 0x60], %%g0\n\t"
1331 "ld [%0 + 0x70], %%g0\n\t"
1332 "ld [%0 + 0x80], %%g0\n\t"
1333 "ld [%0 + 0x90], %%g0\n\t"
1334 "ld [%0 + 0xa0], %%g0\n\t"
1335 "ld [%0 + 0xb0], %%g0\n\t"
1336 "ld [%0 + 0xc0], %%g0\n\t"
1337 "ld [%0 + 0xd0], %%g0\n\t"
1338 "ld [%0 + 0xe0], %%g0\n\t"
1339 "ld [%0 + 0xf0], %%g0\n"
1340 : : "r" (begin));
1341 begin += 256;
1342 }
1343 }
1344 }
1345
1346 static void sun4c_flush_cache_mm(struct mm_struct *mm)
1347 {
1348 int new_ctx = mm->context;
1349
1350 if (new_ctx != NO_CONTEXT) {
1351 flush_user_windows();
1352
1353 if (sun4c_context_ring[new_ctx].num_entries) {
1354 struct sun4c_mmu_entry *head = &sun4c_context_ring[new_ctx].ringhd;
1355 unsigned long flags;
1356
1357 local_irq_save(flags);
1358 if (head->next != head) {
1359 struct sun4c_mmu_entry *entry = head->next;
1360 int savectx = sun4c_get_context();
1361
1362 sun4c_set_context(new_ctx);
1363 sun4c_flush_context();
1364 do {
1365 struct sun4c_mmu_entry *next = entry->next;
1366
1367 sun4c_user_unmap(entry);
1368 free_user_entry(new_ctx, entry);
1369
1370 entry = next;
1371 } while (entry != head);
1372 sun4c_set_context(savectx);
1373 }
1374 local_irq_restore(flags);
1375 }
1376 }
1377 }
1378
1379 static void sun4c_flush_cache_range(struct vm_area_struct *vma, unsigned long start, unsigned long end)
1380 {
1381 struct mm_struct *mm = vma->vm_mm;
1382 int new_ctx = mm->context;
1383
1384 if (new_ctx != NO_CONTEXT) {
1385 struct sun4c_mmu_entry *head = &sun4c_context_ring[new_ctx].ringhd;
1386 struct sun4c_mmu_entry *entry;
1387 unsigned long flags;
1388
1389 flush_user_windows();
1390
1391 local_irq_save(flags);
1392 /* All user segmap chains are ordered on entry->vaddr. */
1393 for (entry = head->next;
1394 (entry != head) && ((entry->vaddr+SUN4C_REAL_PGDIR_SIZE) < start);
1395 entry = entry->next)
1396 ;
1397
1398 /* Tracing various job mixtures showed that this conditional
1399 * only passes ~35% of the time for most worse case situations,
1400 * therefore we avoid all of this gross overhead ~65% of the time.
1401 */
1402 if ((entry != head) && (entry->vaddr < end)) {
1403 int octx = sun4c_get_context();
1404 sun4c_set_context(new_ctx);
1405
1406 /* At this point, always, (start >= entry->vaddr) and
1407 * (entry->vaddr < end), once the latter condition
1408 * ceases to hold, or we hit the end of the list, we
1409 * exit the loop. The ordering of all user allocated
1410 * segmaps makes this all work out so beautifully.
1411 */
1412 do {
1413 struct sun4c_mmu_entry *next = entry->next;
1414 unsigned long realend;
1415
1416 /* "realstart" is always >= entry->vaddr */
1417 realend = entry->vaddr + SUN4C_REAL_PGDIR_SIZE;
1418 if (end < realend)
1419 realend = end;
1420 if ((realend - entry->vaddr) <= (PAGE_SIZE << 3)) {
1421 unsigned long page = entry->vaddr;
1422 while (page < realend) {
1423 sun4c_flush_page(page);
1424 page += PAGE_SIZE;
1425 }
1426 } else {
1427 sun4c_flush_segment(entry->vaddr);
1428 sun4c_user_unmap(entry);
1429 free_user_entry(new_ctx, entry);
1430 }
1431 entry = next;
1432 } while ((entry != head) && (entry->vaddr < end));
1433 sun4c_set_context(octx);
1434 }
1435 local_irq_restore(flags);
1436 }
1437 }
1438
1439 static void sun4c_flush_cache_page(struct vm_area_struct *vma, unsigned long page)
1440 {
1441 struct mm_struct *mm = vma->vm_mm;
1442 int new_ctx = mm->context;
1443
1444 /* Sun4c has no separate I/D caches so cannot optimize for non
1445 * text page flushes.
1446 */
1447 if (new_ctx != NO_CONTEXT) {
1448 int octx = sun4c_get_context();
1449 unsigned long flags;
1450
1451 flush_user_windows();
1452 local_irq_save(flags);
1453 sun4c_set_context(new_ctx);
1454 sun4c_flush_page(page);
1455 sun4c_set_context(octx);
1456 local_irq_restore(flags);
1457 }
1458 }
1459
1460 static void sun4c_flush_page_to_ram(unsigned long page)
1461 {
1462 unsigned long flags;
1463
1464 local_irq_save(flags);
1465 sun4c_flush_page(page);
1466 local_irq_restore(flags);
1467 }
1468
1469 /* Sun4c cache is unified, both instructions and data live there, so
1470 * no need to flush the on-stack instructions for new signal handlers.
1471 */
1472 static void sun4c_flush_sig_insns(struct mm_struct *mm, unsigned long insn_addr)
1473 {
1474 }
1475
1476 /* TLB flushing on the sun4c. These routines count on the cache
1477 * flushing code to flush the user register windows so that we need
1478 * not do so when we get here.
1479 */
1480
1481 static void sun4c_flush_tlb_all(void)
1482 {
1483 struct sun4c_mmu_entry *this_entry, *next_entry;
1484 unsigned long flags;
1485 int savectx, ctx;
1486
1487 local_irq_save(flags);
1488 this_entry = sun4c_kernel_ring.ringhd.next;
1489 savectx = sun4c_get_context();
1490 flush_user_windows();
1491 while (sun4c_kernel_ring.num_entries) {
1492 next_entry = this_entry->next;
1493 sun4c_flush_segment(this_entry->vaddr);
1494 for (ctx = 0; ctx < num_contexts; ctx++) {
1495 sun4c_set_context(ctx);
1496 sun4c_put_segmap(this_entry->vaddr, invalid_segment);
1497 }
1498 free_kernel_entry(this_entry, &sun4c_kernel_ring);
1499 this_entry = next_entry;
1500 }
1501 sun4c_set_context(savectx);
1502 local_irq_restore(flags);
1503 }
1504
1505 static void sun4c_flush_tlb_mm(struct mm_struct *mm)
1506 {
1507 int new_ctx = mm->context;
1508
1509 if (new_ctx != NO_CONTEXT) {
1510 struct sun4c_mmu_entry *head = &sun4c_context_ring[new_ctx].ringhd;
1511 unsigned long flags;
1512
1513 local_irq_save(flags);
1514 if (head->next != head) {
1515 struct sun4c_mmu_entry *entry = head->next;
1516 int savectx = sun4c_get_context();
1517
1518 sun4c_set_context(new_ctx);
1519 sun4c_flush_context();
1520 do {
1521 struct sun4c_mmu_entry *next = entry->next;
1522
1523 sun4c_user_unmap(entry);
1524 free_user_entry(new_ctx, entry);
1525
1526 entry = next;
1527 } while (entry != head);
1528 sun4c_set_context(savectx);
1529 }
1530 local_irq_restore(flags);
1531 }
1532 }
1533
1534 static void sun4c_flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned long end)
1535 {
1536 struct mm_struct *mm = vma->vm_mm;
1537 int new_ctx = mm->context;
1538
1539 if (new_ctx != NO_CONTEXT) {
1540 struct sun4c_mmu_entry *head = &sun4c_context_ring[new_ctx].ringhd;
1541 struct sun4c_mmu_entry *entry;
1542 unsigned long flags;
1543
1544 local_irq_save(flags);
1545 /* See commentary in sun4c_flush_cache_range(). */
1546 for (entry = head->next;
1547 (entry != head) && ((entry->vaddr+SUN4C_REAL_PGDIR_SIZE) < start);
1548 entry = entry->next)
1549 ;
1550
1551 if ((entry != head) && (entry->vaddr < end)) {
1552 int octx = sun4c_get_context();
1553
1554 sun4c_set_context(new_ctx);
1555 do {
1556 struct sun4c_mmu_entry *next = entry->next;
1557
1558 sun4c_flush_segment(entry->vaddr);
1559 sun4c_user_unmap(entry);
1560 free_user_entry(new_ctx, entry);
1561
1562 entry = next;
1563 } while ((entry != head) && (entry->vaddr < end));
1564 sun4c_set_context(octx);
1565 }
1566 local_irq_restore(flags);
1567 }
1568 }
1569
1570 static void sun4c_flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
1571 {
1572 struct mm_struct *mm = vma->vm_mm;
1573 int new_ctx = mm->context;
1574
1575 if (new_ctx != NO_CONTEXT) {
1576 int savectx = sun4c_get_context();
1577 unsigned long flags;
1578
1579 local_irq_save(flags);
1580 sun4c_set_context(new_ctx);
1581 page &= PAGE_MASK;
1582 sun4c_flush_page(page);
1583 sun4c_put_pte(page, 0);
1584 sun4c_set_context(savectx);
1585 local_irq_restore(flags);
1586 }
1587 }
1588
1589 static inline void sun4c_mapioaddr(unsigned long physaddr, unsigned long virt_addr)
1590 {
1591 unsigned long page_entry, pg_iobits;
1592
1593 pg_iobits = _SUN4C_PAGE_PRESENT | _SUN4C_READABLE | _SUN4C_WRITEABLE |
1594 _SUN4C_PAGE_IO | _SUN4C_PAGE_NOCACHE;
1595
1596 page_entry = ((physaddr >> PAGE_SHIFT) & SUN4C_PFN_MASK);
1597 page_entry |= ((pg_iobits | _SUN4C_PAGE_PRIV) & ~(_SUN4C_PAGE_PRESENT));
1598 sun4c_put_pte(virt_addr, page_entry);
1599 }
1600
1601 static void sun4c_mapiorange(unsigned int bus, unsigned long xpa,
1602 unsigned long xva, unsigned int len)
1603 {
1604 while (len != 0) {
1605 len -= PAGE_SIZE;
1606 sun4c_mapioaddr(xpa, xva);
1607 xva += PAGE_SIZE;
1608 xpa += PAGE_SIZE;
1609 }
1610 }
1611
1612 static void sun4c_unmapiorange(unsigned long virt_addr, unsigned int len)
1613 {
1614 while (len != 0) {
1615 len -= PAGE_SIZE;
1616 sun4c_put_pte(virt_addr, 0);
1617 virt_addr += PAGE_SIZE;
1618 }
1619 }
1620
1621 static void sun4c_alloc_context(struct mm_struct *old_mm, struct mm_struct *mm)
1622 {
1623 struct ctx_list *ctxp;
1624
1625 ctxp = ctx_free.next;
1626 if (ctxp != &ctx_free) {
1627 remove_from_ctx_list(ctxp);
1628 add_to_used_ctxlist(ctxp);
1629 mm->context = ctxp->ctx_number;
1630 ctxp->ctx_mm = mm;
1631 return;
1632 }
1633 ctxp = ctx_used.next;
1634 if (ctxp->ctx_mm == old_mm)
1635 ctxp = ctxp->next;
1636 remove_from_ctx_list(ctxp);
1637 add_to_used_ctxlist(ctxp);
1638 ctxp->ctx_mm->context = NO_CONTEXT;
1639 ctxp->ctx_mm = mm;
1640 mm->context = ctxp->ctx_number;
1641 sun4c_demap_context(&sun4c_context_ring[ctxp->ctx_number],
1642 ctxp->ctx_number);
1643 }
1644
1645 /* Switch the current MM context. */
1646 static void sun4c_switch_mm(struct mm_struct *old_mm, struct mm_struct *mm, struct task_struct *tsk, int cpu)
1647 {
1648 struct ctx_list *ctx;
1649 int dirty = 0;
1650
1651 if (mm->context == NO_CONTEXT) {
1652 dirty = 1;
1653 sun4c_alloc_context(old_mm, mm);
1654 } else {
1655 /* Update the LRU ring of contexts. */
1656 ctx = ctx_list_pool + mm->context;
1657 remove_from_ctx_list(ctx);
1658 add_to_used_ctxlist(ctx);
1659 }
1660 if (dirty || old_mm != mm)
1661 sun4c_set_context(mm->context);
1662 }
1663
1664 static void sun4c_destroy_context(struct mm_struct *mm)
1665 {
1666 struct ctx_list *ctx_old;
1667
1668 if (mm->context != NO_CONTEXT) {
1669 sun4c_demap_context(&sun4c_context_ring[mm->context], mm->context);
1670 ctx_old = ctx_list_pool + mm->context;
1671 remove_from_ctx_list(ctx_old);
1672 add_to_free_ctxlist(ctx_old);
1673 mm->context = NO_CONTEXT;
1674 }
1675 }
1676
1677 static void sun4c_mmu_info(struct seq_file *m)
1678 {
1679 int used_user_entries, i;
1680
1681 used_user_entries = 0;
1682 for (i = 0; i < num_contexts; i++)
1683 used_user_entries += sun4c_context_ring[i].num_entries;
1684
1685 seq_printf(m,
1686 "vacsize\t\t: %d bytes\n"
1687 "vachwflush\t: %s\n"
1688 "vaclinesize\t: %d bytes\n"
1689 "mmuctxs\t\t: %d\n"
1690 "mmupsegs\t: %d\n"
1691 "kernelpsegs\t: %d\n"
1692 "kfreepsegs\t: %d\n"
1693 "usedpsegs\t: %d\n"
1694 "ufreepsegs\t: %d\n"
1695 "user_taken\t: %d\n"
1696 "max_taken\t: %d\n",
1697 sun4c_vacinfo.num_bytes,
1698 (sun4c_vacinfo.do_hwflushes ? "yes" : "no"),
1699 sun4c_vacinfo.linesize,
1700 num_contexts,
1701 (invalid_segment + 1),
1702 sun4c_kernel_ring.num_entries,
1703 sun4c_kfree_ring.num_entries,
1704 used_user_entries,
1705 sun4c_ufree_ring.num_entries,
1706 sun4c_user_taken_entries,
1707 max_user_taken_entries);
1708 }
1709
1710 /* Nothing below here should touch the mmu hardware nor the mmu_entry
1711 * data structures.
1712 */
1713
1714 /* First the functions which the mid-level code uses to directly
1715 * manipulate the software page tables. Some defines since we are
1716 * emulating the i386 page directory layout.
1717 */
1718 #define PGD_PRESENT 0x001
1719 #define PGD_RW 0x002
1720 #define PGD_USER 0x004
1721 #define PGD_ACCESSED 0x020
1722 #define PGD_DIRTY 0x040
1723 #define PGD_TABLE (PGD_PRESENT | PGD_RW | PGD_USER | PGD_ACCESSED | PGD_DIRTY)
1724
1725 static void sun4c_set_pte(pte_t *ptep, pte_t pte)
1726 {
1727 *ptep = pte;
1728 }
1729
1730 static void sun4c_pgd_set(pgd_t * pgdp, pmd_t * pmdp)
1731 {
1732 }
1733
1734 static void sun4c_pmd_set(pmd_t * pmdp, pte_t * ptep)
1735 {
1736 pmdp->pmdv[0] = PGD_TABLE | (unsigned long) ptep;
1737 }
1738
1739 static void sun4c_pmd_populate(pmd_t * pmdp, struct page * ptep)
1740 {
1741 if (page_address(ptep) == NULL) BUG(); /* No highmem on sun4c */
1742 pmdp->pmdv[0] = PGD_TABLE | (unsigned long) page_address(ptep);
1743 }
1744
1745 static int sun4c_pte_present(pte_t pte)
1746 {
1747 return ((pte_val(pte) & (_SUN4C_PAGE_PRESENT | _SUN4C_PAGE_PRIV)) != 0);
1748 }
1749 static void sun4c_pte_clear(pte_t *ptep) { *ptep = __pte(0); }
1750
1751 static int sun4c_pte_read(pte_t pte)
1752 {
1753 return (pte_val(pte) & _SUN4C_PAGE_READ);
1754 }
1755
1756 static int sun4c_pmd_bad(pmd_t pmd)
1757 {
1758 return (((pmd_val(pmd) & ~PAGE_MASK) != PGD_TABLE) ||
1759 (!virt_addr_valid(pmd_val(pmd))));
1760 }
1761
1762 static int sun4c_pmd_present(pmd_t pmd)
1763 {
1764 return ((pmd_val(pmd) & PGD_PRESENT) != 0);
1765 }
1766
1767 #if 0 /* if PMD takes one word */
1768 static void sun4c_pmd_clear(pmd_t *pmdp) { *pmdp = __pmd(0); }
1769 #else /* if pmd_t is a longish aggregate */
1770 static void sun4c_pmd_clear(pmd_t *pmdp) {
1771 memset((void *)pmdp, 0, sizeof(pmd_t));
1772 }
1773 #endif
1774
1775 static int sun4c_pgd_none(pgd_t pgd) { return 0; }
1776 static int sun4c_pgd_bad(pgd_t pgd) { return 0; }
1777 static int sun4c_pgd_present(pgd_t pgd) { return 1; }
1778 static void sun4c_pgd_clear(pgd_t * pgdp) { }
1779
1780 /*
1781 * The following only work if pte_present() is true.
1782 * Undefined behaviour if not..
1783 */
1784 static pte_t sun4c_pte_mkwrite(pte_t pte)
1785 {
1786 pte = __pte(pte_val(pte) | _SUN4C_PAGE_WRITE);
1787 if (pte_val(pte) & _SUN4C_PAGE_MODIFIED)
1788 pte = __pte(pte_val(pte) | _SUN4C_PAGE_SILENT_WRITE);
1789 return pte;
1790 }
1791
1792 static pte_t sun4c_pte_mkdirty(pte_t pte)
1793 {
1794 pte = __pte(pte_val(pte) | _SUN4C_PAGE_MODIFIED);
1795 if (pte_val(pte) & _SUN4C_PAGE_WRITE)
1796 pte = __pte(pte_val(pte) | _SUN4C_PAGE_SILENT_WRITE);
1797 return pte;
1798 }
1799
1800 static pte_t sun4c_pte_mkyoung(pte_t pte)
1801 {
1802 pte = __pte(pte_val(pte) | _SUN4C_PAGE_ACCESSED);
1803 if (pte_val(pte) & _SUN4C_PAGE_READ)
1804 pte = __pte(pte_val(pte) | _SUN4C_PAGE_SILENT_READ);
1805 return pte;
1806 }
1807
1808 /*
1809 * Conversion functions: convert a page and protection to a page entry,
1810 * and a page entry and page directory to the page they refer to.
1811 */
1812 static pte_t sun4c_mk_pte(struct page *page, pgprot_t pgprot)
1813 {
1814 return __pte(page_to_pfn(page) | pgprot_val(pgprot));
1815 }
1816
1817 static pte_t sun4c_mk_pte_phys(unsigned long phys_page, pgprot_t pgprot)
1818 {
1819 return __pte((phys_page >> PAGE_SHIFT) | pgprot_val(pgprot));
1820 }
1821
1822 static pte_t sun4c_mk_pte_io(unsigned long page, pgprot_t pgprot, int space)
1823 {
1824 return __pte(((page - PAGE_OFFSET) >> PAGE_SHIFT) | pgprot_val(pgprot));
1825 }
1826
1827 static unsigned long sun4c_pte_pfn(pte_t pte)
1828 {
1829 return pte_val(pte) & SUN4C_PFN_MASK;
1830 }
1831
1832 static pte_t sun4c_pgoff_to_pte(unsigned long pgoff)
1833 {
1834 return __pte(pgoff | _SUN4C_PAGE_FILE);
1835 }
1836
1837 static unsigned long sun4c_pte_to_pgoff(pte_t pte)
1838 {
1839 return pte_val(pte) & ((1UL << PTE_FILE_MAX_BITS) - 1);
1840 }
1841
1842
1843 static __inline__ unsigned long sun4c_pmd_page_v(pmd_t pmd)
1844 {
1845 return (pmd_val(pmd) & PAGE_MASK);
1846 }
1847
1848 static struct page *sun4c_pmd_page(pmd_t pmd)
1849 {
1850 return virt_to_page(sun4c_pmd_page_v(pmd));
1851 }
1852
1853 static unsigned long sun4c_pgd_page(pgd_t pgd) { return 0; }
1854
1855 /* to find an entry in a page-table-directory */
1856 static inline pgd_t *sun4c_pgd_offset(struct mm_struct * mm, unsigned long address)
1857 {
1858 return mm->pgd + (address >> SUN4C_PGDIR_SHIFT);
1859 }
1860
1861 /* Find an entry in the second-level page table.. */
1862 static pmd_t *sun4c_pmd_offset(pgd_t * dir, unsigned long address)
1863 {
1864 return (pmd_t *) dir;
1865 }
1866
1867 /* Find an entry in the third-level page table.. */
1868 pte_t *sun4c_pte_offset_kernel(pmd_t * dir, unsigned long address)
1869 {
1870 return (pte_t *) sun4c_pmd_page_v(*dir) +
1871 ((address >> PAGE_SHIFT) & (SUN4C_PTRS_PER_PTE - 1));
1872 }
1873
1874 static unsigned long sun4c_swp_type(swp_entry_t entry)
1875 {
1876 return (entry.val & SUN4C_SWP_TYPE_MASK);
1877 }
1878
1879 static unsigned long sun4c_swp_offset(swp_entry_t entry)
1880 {
1881 return (entry.val >> SUN4C_SWP_OFF_SHIFT) & SUN4C_SWP_OFF_MASK;
1882 }
1883
1884 static swp_entry_t sun4c_swp_entry(unsigned long type, unsigned long offset)
1885 {
1886 return (swp_entry_t) {
1887 (offset & SUN4C_SWP_OFF_MASK) << SUN4C_SWP_OFF_SHIFT
1888 | (type & SUN4C_SWP_TYPE_MASK) };
1889 }
1890
1891 static void sun4c_free_pte_slow(pte_t *pte)
1892 {
1893 free_page((unsigned long)pte);
1894 }
1895
1896 static void sun4c_free_pgd_slow(pgd_t *pgd)
1897 {
1898 free_page((unsigned long)pgd);
1899 }
1900
1901 static pgd_t *sun4c_get_pgd_fast(void)
1902 {
1903 unsigned long *ret;
1904
1905 if ((ret = pgd_quicklist) != NULL) {
1906 pgd_quicklist = (unsigned long *)(*ret);
1907 ret[0] = ret[1];
1908 pgtable_cache_size--;
1909 } else {
1910 pgd_t *init;
1911
1912 ret = (unsigned long *)__get_free_page(GFP_KERNEL);
1913 memset (ret, 0, (KERNBASE / SUN4C_PGDIR_SIZE) * sizeof(pgd_t));
1914 init = sun4c_pgd_offset(&init_mm, 0);
1915 memcpy (((pgd_t *)ret) + USER_PTRS_PER_PGD, init + USER_PTRS_PER_PGD,
1916 (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
1917 }
1918 return (pgd_t *)ret;
1919 }
1920
1921 static void sun4c_free_pgd_fast(pgd_t *pgd)
1922 {
1923 *(unsigned long *)pgd = (unsigned long) pgd_quicklist;
1924 pgd_quicklist = (unsigned long *) pgd;
1925 pgtable_cache_size++;
1926 }
1927
1928
1929 static __inline__ pte_t *
1930 sun4c_pte_alloc_one_fast(struct mm_struct *mm, unsigned long address)
1931 {
1932 unsigned long *ret;
1933
1934 if ((ret = (unsigned long *)pte_quicklist) != NULL) {
1935 pte_quicklist = (unsigned long *)(*ret);
1936 ret[0] = ret[1];
1937 pgtable_cache_size--;
1938 }
1939 return (pte_t *)ret;
1940 }
1941
1942 static pte_t *sun4c_pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)
1943 {
1944 pte_t *pte;
1945
1946 if ((pte = sun4c_pte_alloc_one_fast(mm, address)) != NULL)
1947 return pte;
1948
1949 pte = (pte_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT);
1950 if (pte)
1951 memset(pte, 0, PAGE_SIZE);
1952 return pte;
1953 }
1954
1955 static struct page *sun4c_pte_alloc_one(struct mm_struct *mm, unsigned long address)
1956 {
1957 pte_t *pte = sun4c_pte_alloc_one_kernel(mm, address);
1958 if (pte == NULL)
1959 return NULL;
1960 return virt_to_page(pte);
1961 }
1962
1963 static __inline__ void sun4c_free_pte_fast(pte_t *pte)
1964 {
1965 *(unsigned long *)pte = (unsigned long) pte_quicklist;
1966 pte_quicklist = (unsigned long *) pte;
1967 pgtable_cache_size++;
1968 }
1969
1970 static void sun4c_pte_free(struct page *pte)
1971 {
1972 sun4c_free_pte_fast(page_address(pte));
1973 }
1974
1975 /*
1976 * allocating and freeing a pmd is trivial: the 1-entry pmd is
1977 * inside the pgd, so has no extra memory associated with it.
1978 */
1979 static pmd_t *sun4c_pmd_alloc_one(struct mm_struct *mm, unsigned long address)
1980 {
1981 BUG();
1982 return NULL;
1983 }
1984
1985 static void sun4c_free_pmd_fast(pmd_t * pmd) { }
1986
1987 static void sun4c_check_pgt_cache(int low, int high)
1988 {
1989 if (pgtable_cache_size > high) {
1990 do {
1991 if (pgd_quicklist)
1992 sun4c_free_pgd_slow(sun4c_get_pgd_fast());
1993 if (pte_quicklist)
1994 sun4c_free_pte_slow(sun4c_pte_alloc_one_fast(NULL, 0));
1995 } while (pgtable_cache_size > low);
1996 }
1997 }
1998
1999 /* An experiment, turn off by default for now... -DaveM */
2000 #define SUN4C_PRELOAD_PSEG
2001
2002 void sun4c_update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t pte)
2003 {
2004 unsigned long flags;
2005 int pseg;
2006
2007 local_irq_save(flags);
2008 address &= PAGE_MASK;
2009 if ((pseg = sun4c_get_segmap(address)) == invalid_segment) {
2010 struct sun4c_mmu_entry *entry = sun4c_user_strategy();
2011 struct mm_struct *mm = vma->vm_mm;
2012 unsigned long start, end;
2013
2014 entry->vaddr = start = (address & SUN4C_REAL_PGDIR_MASK);
2015 entry->ctx = mm->context;
2016 add_ring_ordered(sun4c_context_ring + mm->context, entry);
2017 sun4c_put_segmap(entry->vaddr, entry->pseg);
2018 end = start + SUN4C_REAL_PGDIR_SIZE;
2019 while (start < end) {
2020 #ifdef SUN4C_PRELOAD_PSEG
2021 pgd_t *pgdp = sun4c_pgd_offset(mm, start);
2022 pte_t *ptep;
2023
2024 if (!pgdp)
2025 goto no_mapping;
2026 ptep = sun4c_pte_offset_kernel((pmd_t *) pgdp, start);
2027 if (!ptep || !(pte_val(*ptep) & _SUN4C_PAGE_PRESENT))
2028 goto no_mapping;
2029 sun4c_put_pte(start, pte_val(*ptep));
2030 goto next;
2031
2032 no_mapping:
2033 #endif
2034 sun4c_put_pte(start, 0);
2035 #ifdef SUN4C_PRELOAD_PSEG
2036 next:
2037 #endif
2038 start += PAGE_SIZE;
2039 }
2040 #ifndef SUN4C_PRELOAD_PSEG
2041 sun4c_put_pte(address, pte_val(pte));
2042 #endif
2043 local_irq_restore(flags);
2044 return;
2045 } else {
2046 struct sun4c_mmu_entry *entry = &mmu_entry_pool[pseg];
2047
2048 remove_lru(entry);
2049 add_lru(entry);
2050 }
2051
2052 sun4c_put_pte(address, pte_val(pte));
2053 local_irq_restore(flags);
2054 }
2055
2056 extern void sparc_context_init(int);
2057 extern unsigned long end;
2058 extern unsigned long bootmem_init(unsigned long *pages_avail);
2059 extern unsigned long last_valid_pfn;
2060
2061 void __init sun4c_paging_init(void)
2062 {
2063 int i, cnt;
2064 unsigned long kernel_end, vaddr;
2065 extern struct resource sparc_iomap;
2066 unsigned long end_pfn, pages_avail;
2067
2068 kernel_end = (unsigned long) &end;
2069 kernel_end += (SUN4C_REAL_PGDIR_SIZE * 4);
2070 kernel_end = SUN4C_REAL_PGDIR_ALIGN(kernel_end);
2071
2072 pages_avail = 0;
2073 last_valid_pfn = bootmem_init(&pages_avail);
2074 end_pfn = last_valid_pfn;
2075
2076 sun4c_probe_mmu();
2077 invalid_segment = (num_segmaps - 1);
2078 sun4c_init_mmu_entry_pool();
2079 sun4c_init_rings();
2080 sun4c_init_map_kernelprom(kernel_end);
2081 sun4c_init_clean_mmu(kernel_end);
2082 sun4c_init_fill_kernel_ring(SUN4C_KERNEL_BUCKETS);
2083 sun4c_init_lock_area(sparc_iomap.start, IOBASE_END);
2084 sun4c_init_lock_area(DVMA_VADDR, DVMA_END);
2085 sun4c_init_lock_areas();
2086 sun4c_init_fill_user_ring();
2087
2088 sun4c_set_context(0);
2089 memset(swapper_pg_dir, 0, PAGE_SIZE);
2090 memset(pg0, 0, PAGE_SIZE);
2091 memset(pg1, 0, PAGE_SIZE);
2092 memset(pg2, 0, PAGE_SIZE);
2093 memset(pg3, 0, PAGE_SIZE);
2094
2095 /* Save work later. */
2096 vaddr = VMALLOC_START;
2097 swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg0);
2098 vaddr += SUN4C_PGDIR_SIZE;
2099 swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg1);
2100 vaddr += SUN4C_PGDIR_SIZE;
2101 swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg2);
2102 vaddr += SUN4C_PGDIR_SIZE;
2103 swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg3);
2104 sun4c_init_ss2_cache_bug();
2105 sparc_context_init(num_contexts);
2106
2107 {
2108 unsigned long zones_size[MAX_NR_ZONES];
2109 unsigned long zholes_size[MAX_NR_ZONES];
2110 unsigned long npages;
2111 int znum;
2112
2113 for (znum = 0; znum < MAX_NR_ZONES; znum++)
2114 zones_size[znum] = zholes_size[znum] = 0;
2115
2116 npages = max_low_pfn - pfn_base;
2117
2118 zones_size[ZONE_DMA] = npages;
2119 zholes_size[ZONE_DMA] = npages - pages_avail;
2120
2121 npages = highend_pfn - max_low_pfn;
2122 zones_size[ZONE_HIGHMEM] = npages;
2123 zholes_size[ZONE_HIGHMEM] = npages - calc_highpages();
2124
2125 free_area_init_node(0, &contig_page_data, zones_size,
2126 pfn_base, zholes_size);
2127 }
2128
2129 cnt = 0;
2130 for (i = 0; i < num_segmaps; i++)
2131 if (mmu_entry_pool[i].locked)
2132 cnt++;
2133
2134 max_user_taken_entries = num_segmaps - cnt - 40 - 1;
2135
2136 printk("SUN4C: %d mmu entries for the kernel\n", cnt);
2137 }
2138
2139 static pgprot_t sun4c_pgprot_noncached(pgprot_t prot)
2140 {
2141 prot |= __pgprot(_SUN4C_PAGE_IO | _SUN4C_PAGE_NOCACHE);
2142
2143 return prot;
2144 }
2145
2146 /* Load up routines and constants for sun4c mmu */
2147 void __init ld_mmu_sun4c(void)
2148 {
2149 extern void ___xchg32_sun4c(void);
2150
2151 printk("Loading sun4c MMU routines\n");
2152
2153 /* First the constants */
2154 BTFIXUPSET_SIMM13(pgdir_shift, SUN4C_PGDIR_SHIFT);
2155 BTFIXUPSET_SETHI(pgdir_size, SUN4C_PGDIR_SIZE);
2156 BTFIXUPSET_SETHI(pgdir_mask, SUN4C_PGDIR_MASK);
2157
2158 BTFIXUPSET_SIMM13(ptrs_per_pmd, SUN4C_PTRS_PER_PMD);
2159 BTFIXUPSET_SIMM13(ptrs_per_pgd, SUN4C_PTRS_PER_PGD);
2160 BTFIXUPSET_SIMM13(user_ptrs_per_pgd, KERNBASE / SUN4C_PGDIR_SIZE);
2161
2162 BTFIXUPSET_INT(page_none, pgprot_val(SUN4C_PAGE_NONE));
2163 BTFIXUPSET_INT(page_shared, pgprot_val(SUN4C_PAGE_SHARED));
2164 BTFIXUPSET_INT(page_copy, pgprot_val(SUN4C_PAGE_COPY));
2165 BTFIXUPSET_INT(page_readonly, pgprot_val(SUN4C_PAGE_READONLY));
2166 BTFIXUPSET_INT(page_kernel, pgprot_val(SUN4C_PAGE_KERNEL));
2167 page_kernel = pgprot_val(SUN4C_PAGE_KERNEL);
2168
2169 /* Functions */
2170 BTFIXUPSET_CALL(pgprot_noncached, sun4c_pgprot_noncached, BTFIXUPCALL_NORM);
2171 BTFIXUPSET_CALL(___xchg32, ___xchg32_sun4c, BTFIXUPCALL_NORM);
2172 BTFIXUPSET_CALL(do_check_pgt_cache, sun4c_check_pgt_cache, BTFIXUPCALL_NORM);
2173
2174 BTFIXUPSET_CALL(flush_cache_all, sun4c_flush_cache_all, BTFIXUPCALL_NORM);
2175
2176 if (sun4c_vacinfo.do_hwflushes) {
2177 BTFIXUPSET_CALL(sun4c_flush_page, sun4c_flush_page_hw, BTFIXUPCALL_NORM);
2178 BTFIXUPSET_CALL(sun4c_flush_segment, sun4c_flush_segment_hw, BTFIXUPCALL_NORM);
2179 BTFIXUPSET_CALL(sun4c_flush_context, sun4c_flush_context_hw, BTFIXUPCALL_NORM);
2180 } else {
2181 BTFIXUPSET_CALL(sun4c_flush_page, sun4c_flush_page_sw, BTFIXUPCALL_NORM);
2182 BTFIXUPSET_CALL(sun4c_flush_segment, sun4c_flush_segment_sw, BTFIXUPCALL_NORM);
2183 BTFIXUPSET_CALL(sun4c_flush_context, sun4c_flush_context_sw, BTFIXUPCALL_NORM);
2184 }
2185
2186 BTFIXUPSET_CALL(flush_tlb_mm, sun4c_flush_tlb_mm, BTFIXUPCALL_NORM);
2187 BTFIXUPSET_CALL(flush_cache_mm, sun4c_flush_cache_mm, BTFIXUPCALL_NORM);
2188 BTFIXUPSET_CALL(destroy_context, sun4c_destroy_context, BTFIXUPCALL_NORM);
2189 BTFIXUPSET_CALL(switch_mm, sun4c_switch_mm, BTFIXUPCALL_NORM);
2190 BTFIXUPSET_CALL(flush_cache_page, sun4c_flush_cache_page, BTFIXUPCALL_NORM);
2191 BTFIXUPSET_CALL(flush_tlb_page, sun4c_flush_tlb_page, BTFIXUPCALL_NORM);
2192 BTFIXUPSET_CALL(flush_tlb_range, sun4c_flush_tlb_range, BTFIXUPCALL_NORM);
2193 BTFIXUPSET_CALL(flush_cache_range, sun4c_flush_cache_range, BTFIXUPCALL_NORM);
2194 BTFIXUPSET_CALL(__flush_page_to_ram, sun4c_flush_page_to_ram, BTFIXUPCALL_NORM);
2195 BTFIXUPSET_CALL(flush_tlb_all, sun4c_flush_tlb_all, BTFIXUPCALL_NORM);
2196
2197 BTFIXUPSET_CALL(flush_sig_insns, sun4c_flush_sig_insns, BTFIXUPCALL_NOP);
2198
2199 BTFIXUPSET_CALL(set_pte, sun4c_set_pte, BTFIXUPCALL_STO1O0);
2200
2201 /* The 2.4.18 code does not set this on sun4c, how does it work? XXX */
2202 /* BTFIXUPSET_SETHI(none_mask, 0x00000000); */ /* Defaults to zero? */
2203
2204 BTFIXUPSET_CALL(pte_pfn, sun4c_pte_pfn, BTFIXUPCALL_NORM);
2205 #if 0 /* PAGE_SHIFT <= 12 */ /* Eek. Investigate. XXX */
2206 BTFIXUPSET_CALL(pmd_page, sun4c_pmd_page, BTFIXUPCALL_ANDNINT(PAGE_SIZE - 1));
2207 #else
2208 BTFIXUPSET_CALL(pmd_page, sun4c_pmd_page, BTFIXUPCALL_NORM);
2209 #endif
2210 BTFIXUPSET_CALL(pmd_set, sun4c_pmd_set, BTFIXUPCALL_NORM);
2211 BTFIXUPSET_CALL(pmd_populate, sun4c_pmd_populate, BTFIXUPCALL_NORM);
2212
2213 BTFIXUPSET_CALL(pte_present, sun4c_pte_present, BTFIXUPCALL_NORM);
2214 BTFIXUPSET_CALL(pte_clear, sun4c_pte_clear, BTFIXUPCALL_STG0O0);
2215 BTFIXUPSET_CALL(pte_read, sun4c_pte_read, BTFIXUPCALL_NORM);
2216
2217 BTFIXUPSET_CALL(pmd_bad, sun4c_pmd_bad, BTFIXUPCALL_NORM);
2218 BTFIXUPSET_CALL(pmd_present, sun4c_pmd_present, BTFIXUPCALL_NORM);
2219 BTFIXUPSET_CALL(pmd_clear, sun4c_pmd_clear, BTFIXUPCALL_STG0O0);
2220
2221 BTFIXUPSET_CALL(pgd_none, sun4c_pgd_none, BTFIXUPCALL_RETINT(0));
2222 BTFIXUPSET_CALL(pgd_bad, sun4c_pgd_bad, BTFIXUPCALL_RETINT(0));
2223 BTFIXUPSET_CALL(pgd_present, sun4c_pgd_present, BTFIXUPCALL_RETINT(1));
2224 BTFIXUPSET_CALL(pgd_clear, sun4c_pgd_clear, BTFIXUPCALL_NOP);
2225
2226 BTFIXUPSET_CALL(mk_pte, sun4c_mk_pte, BTFIXUPCALL_NORM);
2227 BTFIXUPSET_CALL(mk_pte_phys, sun4c_mk_pte_phys, BTFIXUPCALL_NORM);
2228 BTFIXUPSET_CALL(mk_pte_io, sun4c_mk_pte_io, BTFIXUPCALL_NORM);
2229
2230 BTFIXUPSET_INT(pte_modify_mask, _SUN4C_PAGE_CHG_MASK);
2231 BTFIXUPSET_CALL(pmd_offset, sun4c_pmd_offset, BTFIXUPCALL_NORM);
2232 BTFIXUPSET_CALL(pte_offset_kernel, sun4c_pte_offset_kernel, BTFIXUPCALL_NORM);
2233 BTFIXUPSET_CALL(free_pte_fast, sun4c_free_pte_fast, BTFIXUPCALL_NORM);
2234 BTFIXUPSET_CALL(pte_free, sun4c_pte_free, BTFIXUPCALL_NORM);
2235 BTFIXUPSET_CALL(pte_alloc_one_kernel, sun4c_pte_alloc_one_kernel, BTFIXUPCALL_NORM);
2236 BTFIXUPSET_CALL(pte_alloc_one, sun4c_pte_alloc_one, BTFIXUPCALL_NORM);
2237 BTFIXUPSET_CALL(free_pmd_fast, sun4c_free_pmd_fast, BTFIXUPCALL_NOP);
2238 BTFIXUPSET_CALL(pmd_alloc_one, sun4c_pmd_alloc_one, BTFIXUPCALL_RETO0);
2239 BTFIXUPSET_CALL(free_pgd_fast, sun4c_free_pgd_fast, BTFIXUPCALL_NORM);
2240 BTFIXUPSET_CALL(get_pgd_fast, sun4c_get_pgd_fast, BTFIXUPCALL_NORM);
2241
2242 BTFIXUPSET_HALF(pte_writei, _SUN4C_PAGE_WRITE);
2243 BTFIXUPSET_HALF(pte_dirtyi, _SUN4C_PAGE_MODIFIED);
2244 BTFIXUPSET_HALF(pte_youngi, _SUN4C_PAGE_ACCESSED);
2245 BTFIXUPSET_HALF(pte_filei, _SUN4C_PAGE_FILE);
2246 BTFIXUPSET_HALF(pte_wrprotecti, _SUN4C_PAGE_WRITE|_SUN4C_PAGE_SILENT_WRITE);
2247 BTFIXUPSET_HALF(pte_mkcleani, _SUN4C_PAGE_MODIFIED|_SUN4C_PAGE_SILENT_WRITE);
2248 BTFIXUPSET_HALF(pte_mkoldi, _SUN4C_PAGE_ACCESSED|_SUN4C_PAGE_SILENT_READ);
2249 BTFIXUPSET_CALL(pte_mkwrite, sun4c_pte_mkwrite, BTFIXUPCALL_NORM);
2250 BTFIXUPSET_CALL(pte_mkdirty, sun4c_pte_mkdirty, BTFIXUPCALL_NORM);
2251 BTFIXUPSET_CALL(pte_mkyoung, sun4c_pte_mkyoung, BTFIXUPCALL_NORM);
2252 BTFIXUPSET_CALL(update_mmu_cache, sun4c_update_mmu_cache, BTFIXUPCALL_NORM);
2253
2254 BTFIXUPSET_CALL(pte_to_pgoff, sun4c_pte_to_pgoff, BTFIXUPCALL_NORM);
2255 BTFIXUPSET_CALL(pgoff_to_pte, sun4c_pgoff_to_pte, BTFIXUPCALL_NORM);
2256
2257 BTFIXUPSET_CALL(mmu_lockarea, sun4c_lockarea, BTFIXUPCALL_NORM);
2258 BTFIXUPSET_CALL(mmu_unlockarea, sun4c_unlockarea, BTFIXUPCALL_NORM);
2259
2260 BTFIXUPSET_CALL(mmu_get_scsi_one, sun4c_get_scsi_one, BTFIXUPCALL_NORM);
2261 BTFIXUPSET_CALL(mmu_get_scsi_sgl, sun4c_get_scsi_sgl, BTFIXUPCALL_NORM);
2262 BTFIXUPSET_CALL(mmu_release_scsi_one, sun4c_release_scsi_one, BTFIXUPCALL_NORM);
2263 BTFIXUPSET_CALL(mmu_release_scsi_sgl, sun4c_release_scsi_sgl, BTFIXUPCALL_NORM);
2264
2265 BTFIXUPSET_CALL(mmu_map_dma_area, sun4c_map_dma_area, BTFIXUPCALL_NORM);
2266 BTFIXUPSET_CALL(mmu_unmap_dma_area, sun4c_unmap_dma_area, BTFIXUPCALL_NORM);
2267 BTFIXUPSET_CALL(mmu_translate_dvma, sun4c_translate_dvma, BTFIXUPCALL_NORM);
2268
2269 BTFIXUPSET_CALL(sparc_mapiorange, sun4c_mapiorange, BTFIXUPCALL_NORM);
2270 BTFIXUPSET_CALL(sparc_unmapiorange, sun4c_unmapiorange, BTFIXUPCALL_NORM);
2271
2272 BTFIXUPSET_CALL(__swp_type, sun4c_swp_type, BTFIXUPCALL_NORM);
2273 BTFIXUPSET_CALL(__swp_offset, sun4c_swp_offset, BTFIXUPCALL_NORM);
2274 BTFIXUPSET_CALL(__swp_entry, sun4c_swp_entry, BTFIXUPCALL_NORM);
2275
2276 BTFIXUPSET_CALL(alloc_thread_info, sun4c_alloc_thread_info, BTFIXUPCALL_NORM);
2277 BTFIXUPSET_CALL(free_thread_info, sun4c_free_thread_info, BTFIXUPCALL_NORM);
2278
2279 BTFIXUPSET_CALL(mmu_info, sun4c_mmu_info, BTFIXUPCALL_NORM);
2280
2281 /* These should _never_ get called with two level tables. */
2282 BTFIXUPSET_CALL(pgd_set, sun4c_pgd_set, BTFIXUPCALL_NOP);
2283 BTFIXUPSET_CALL(pgd_page_vaddr, sun4c_pgd_page, BTFIXUPCALL_RETO0);
2284 }
WRT350N Kernel Patches