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netxen: optimize tx handling
[pv_ops_mirror.git] / arch / sparc / mm / sun4c.c
blob0729305f2f594a83ff6259ec1e5e223ba51ab30c
1 /* sun4c.c: Doing in software what should be done in hardware.
2 *
3 * Copyright (C) 1996 David S. Miller (davem@davemloft.net)
4 * Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be)
5 * Copyright (C) 1996 Andrew Tridgell (Andrew.Tridgell@anu.edu.au)
6 * Copyright (C) 1997-2000 Anton Blanchard (anton@samba.org)
7 * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
8 */
9
10 #define NR_TASK_BUCKETS 512
11
12 #include <linux/kernel.h>
13 #include <linux/mm.h>
14 #include <linux/init.h>
15 #include <linux/bootmem.h>
16 #include <linux/highmem.h>
17 #include <linux/fs.h>
18 #include <linux/seq_file.h>
19 #include <linux/scatterlist.h>
20
21 #include <asm/page.h>
22 #include <asm/pgalloc.h>
23 #include <asm/pgtable.h>
24 #include <asm/vaddrs.h>
25 #include <asm/idprom.h>
26 #include <asm/machines.h>
27 #include <asm/memreg.h>
28 #include <asm/processor.h>
29 #include <asm/auxio.h>
30 #include <asm/io.h>
31 #include <asm/oplib.h>
32 #include <asm/openprom.h>
33 #include <asm/mmu_context.h>
34 #include <asm/sun4paddr.h>
35 #include <asm/highmem.h>
36 #include <asm/btfixup.h>
37 #include <asm/cacheflush.h>
38 #include <asm/tlbflush.h>
39
40 /* Because of our dynamic kernel TLB miss strategy, and how
41 * our DVMA mapping allocation works, you _MUST_:
42 *
43 * 1) Disable interrupts _and_ not touch any dynamic kernel
44 * memory while messing with kernel MMU state. By
45 * dynamic memory I mean any object which is not in
46 * the kernel image itself or a thread_union (both of
47 * which are locked into the MMU).
48 * 2) Disable interrupts while messing with user MMU state.
49 */
50
51 extern int num_segmaps, num_contexts;
52
53 extern unsigned long page_kernel;
54
55 #ifdef CONFIG_SUN4
56 #define SUN4C_VAC_SIZE sun4c_vacinfo.num_bytes
57 #else
58 /* That's it, we prom_halt() on sun4c if the cache size is something other than 65536.
59 * So let's save some cycles and just use that everywhere except for that bootup
60 * sanity check.
61 */
62 #define SUN4C_VAC_SIZE 65536
63 #endif
64
65 #define SUN4C_KERNEL_BUCKETS 32
66
67 /* Flushing the cache. */
68 struct sun4c_vac_props sun4c_vacinfo;
69 unsigned long sun4c_kernel_faults;
70
71 /* Invalidate every sun4c cache line tag. */
72 static void __init sun4c_flush_all(void)
73 {
74 unsigned long begin, end;
75
76 if (sun4c_vacinfo.on)
77 panic("SUN4C: AIEEE, trying to invalidate vac while it is on.");
78
79 /* Clear 'valid' bit in all cache line tags */
80 begin = AC_CACHETAGS;
81 end = (AC_CACHETAGS + SUN4C_VAC_SIZE);
82 while (begin < end) {
83 __asm__ __volatile__("sta %%g0, [%0] %1\n\t" : :
84 "r" (begin), "i" (ASI_CONTROL));
85 begin += sun4c_vacinfo.linesize;
86 }
87 }
88
89 static void sun4c_flush_context_hw(void)
90 {
91 unsigned long end = SUN4C_VAC_SIZE;
92
93 __asm__ __volatile__(
94 "1: addcc %0, -4096, %0\n\t"
95 " bne 1b\n\t"
96 " sta %%g0, [%0] %2"
97 : "=&r" (end)
98 : "0" (end), "i" (ASI_HWFLUSHCONTEXT)
99 : "cc");
100 }
101
102 /* Must be called minimally with IRQs disabled. */
103 static void sun4c_flush_segment_hw(unsigned long addr)
104 {
105 if (sun4c_get_segmap(addr) != invalid_segment) {
106 unsigned long vac_size = SUN4C_VAC_SIZE;
107
108 __asm__ __volatile__(
109 "1: addcc %0, -4096, %0\n\t"
110 " bne 1b\n\t"
111 " sta %%g0, [%2 + %0] %3"
112 : "=&r" (vac_size)
113 : "0" (vac_size), "r" (addr), "i" (ASI_HWFLUSHSEG)
114 : "cc");
115 }
116 }
117
118 /* File local boot time fixups. */
119 BTFIXUPDEF_CALL(void, sun4c_flush_page, unsigned long)
120 BTFIXUPDEF_CALL(void, sun4c_flush_segment, unsigned long)
121 BTFIXUPDEF_CALL(void, sun4c_flush_context, void)
122
123 #define sun4c_flush_page(addr) BTFIXUP_CALL(sun4c_flush_page)(addr)
124 #define sun4c_flush_segment(addr) BTFIXUP_CALL(sun4c_flush_segment)(addr)
125 #define sun4c_flush_context() BTFIXUP_CALL(sun4c_flush_context)()
126
127 /* Must be called minimally with interrupts disabled. */
128 static void sun4c_flush_page_hw(unsigned long addr)
129 {
130 addr &= PAGE_MASK;
131 if ((int)sun4c_get_pte(addr) < 0)
132 __asm__ __volatile__("sta %%g0, [%0] %1"
133 : : "r" (addr), "i" (ASI_HWFLUSHPAGE));
134 }
135
136 /* Don't inline the software version as it eats too many cache lines if expanded. */
137 static void sun4c_flush_context_sw(void)
138 {
139 unsigned long nbytes = SUN4C_VAC_SIZE;
140 unsigned long lsize = sun4c_vacinfo.linesize;
141
142 __asm__ __volatile__(
143 "add %2, %2, %%g1\n\t"
144 "add %2, %%g1, %%g2\n\t"
145 "add %2, %%g2, %%g3\n\t"
146 "add %2, %%g3, %%g4\n\t"
147 "add %2, %%g4, %%g5\n\t"
148 "add %2, %%g5, %%o4\n\t"
149 "add %2, %%o4, %%o5\n"
150 "1:\n\t"
151 "subcc %0, %%o5, %0\n\t"
152 "sta %%g0, [%0] %3\n\t"
153 "sta %%g0, [%0 + %2] %3\n\t"
154 "sta %%g0, [%0 + %%g1] %3\n\t"
155 "sta %%g0, [%0 + %%g2] %3\n\t"
156 "sta %%g0, [%0 + %%g3] %3\n\t"
157 "sta %%g0, [%0 + %%g4] %3\n\t"
158 "sta %%g0, [%0 + %%g5] %3\n\t"
159 "bg 1b\n\t"
160 " sta %%g0, [%1 + %%o4] %3\n"
161 : "=&r" (nbytes)
162 : "0" (nbytes), "r" (lsize), "i" (ASI_FLUSHCTX)
163 : "g1", "g2", "g3", "g4", "g5", "o4", "o5", "cc");
164 }
165
166 /* Don't inline the software version as it eats too many cache lines if expanded. */
167 static void sun4c_flush_segment_sw(unsigned long addr)
168 {
169 if (sun4c_get_segmap(addr) != invalid_segment) {
170 unsigned long nbytes = SUN4C_VAC_SIZE;
171 unsigned long lsize = sun4c_vacinfo.linesize;
172
173 __asm__ __volatile__(
174 "add %2, %2, %%g1\n\t"
175 "add %2, %%g1, %%g2\n\t"
176 "add %2, %%g2, %%g3\n\t"
177 "add %2, %%g3, %%g4\n\t"
178 "add %2, %%g4, %%g5\n\t"
179 "add %2, %%g5, %%o4\n\t"
180 "add %2, %%o4, %%o5\n"
181 "1:\n\t"
182 "subcc %1, %%o5, %1\n\t"
183 "sta %%g0, [%0] %6\n\t"
184 "sta %%g0, [%0 + %2] %6\n\t"
185 "sta %%g0, [%0 + %%g1] %6\n\t"
186 "sta %%g0, [%0 + %%g2] %6\n\t"
187 "sta %%g0, [%0 + %%g3] %6\n\t"
188 "sta %%g0, [%0 + %%g4] %6\n\t"
189 "sta %%g0, [%0 + %%g5] %6\n\t"
190 "sta %%g0, [%0 + %%o4] %6\n\t"
191 "bg 1b\n\t"
192 " add %0, %%o5, %0\n"
193 : "=&r" (addr), "=&r" (nbytes), "=&r" (lsize)
194 : "0" (addr), "1" (nbytes), "2" (lsize),
195 "i" (ASI_FLUSHSEG)
196 : "g1", "g2", "g3", "g4", "g5", "o4", "o5", "cc");
197 }
198 }
199
200 /* Don't inline the software version as it eats too many cache lines if expanded. */
201 static void sun4c_flush_page_sw(unsigned long addr)
202 {
203 addr &= PAGE_MASK;
204 if ((sun4c_get_pte(addr) & (_SUN4C_PAGE_NOCACHE | _SUN4C_PAGE_VALID)) ==
205 _SUN4C_PAGE_VALID) {
206 unsigned long left = PAGE_SIZE;
207 unsigned long lsize = sun4c_vacinfo.linesize;
208
209 __asm__ __volatile__(
210 "add %2, %2, %%g1\n\t"
211 "add %2, %%g1, %%g2\n\t"
212 "add %2, %%g2, %%g3\n\t"
213 "add %2, %%g3, %%g4\n\t"
214 "add %2, %%g4, %%g5\n\t"
215 "add %2, %%g5, %%o4\n\t"
216 "add %2, %%o4, %%o5\n"
217 "1:\n\t"
218 "subcc %1, %%o5, %1\n\t"
219 "sta %%g0, [%0] %6\n\t"
220 "sta %%g0, [%0 + %2] %6\n\t"
221 "sta %%g0, [%0 + %%g1] %6\n\t"
222 "sta %%g0, [%0 + %%g2] %6\n\t"
223 "sta %%g0, [%0 + %%g3] %6\n\t"
224 "sta %%g0, [%0 + %%g4] %6\n\t"
225 "sta %%g0, [%0 + %%g5] %6\n\t"
226 "sta %%g0, [%0 + %%o4] %6\n\t"
227 "bg 1b\n\t"
228 " add %0, %%o5, %0\n"
229 : "=&r" (addr), "=&r" (left), "=&r" (lsize)
230 : "0" (addr), "1" (left), "2" (lsize),
231 "i" (ASI_FLUSHPG)
232 : "g1", "g2", "g3", "g4", "g5", "o4", "o5", "cc");
233 }
234 }
235
236 /* The sun4c's do have an on chip store buffer. And the way you
237 * clear them out isn't so obvious. The only way I can think of
238 * to accomplish this is to read the current context register,
239 * store the same value there, then read an external hardware
240 * register.
241 */
242 void sun4c_complete_all_stores(void)
243 {
244 volatile int _unused;
245
246 _unused = sun4c_get_context();
247 sun4c_set_context(_unused);
248 #ifdef CONFIG_SUN_AUXIO
249 _unused = get_auxio();
250 #endif
251 }
252
253 /* Bootup utility functions. */
254 static inline void sun4c_init_clean_segmap(unsigned char pseg)
255 {
256 unsigned long vaddr;
257
258 sun4c_put_segmap(0, pseg);
259 for (vaddr = 0; vaddr < SUN4C_REAL_PGDIR_SIZE; vaddr += PAGE_SIZE)
260 sun4c_put_pte(vaddr, 0);
261 sun4c_put_segmap(0, invalid_segment);
262 }
263
264 static inline void sun4c_init_clean_mmu(unsigned long kernel_end)
265 {
266 unsigned long vaddr;
267 unsigned char savectx, ctx;
268
269 savectx = sun4c_get_context();
270 for (ctx = 0; ctx < num_contexts; ctx++) {
271 sun4c_set_context(ctx);
272 for (vaddr = 0; vaddr < 0x20000000; vaddr += SUN4C_REAL_PGDIR_SIZE)
273 sun4c_put_segmap(vaddr, invalid_segment);
274 for (vaddr = 0xe0000000; vaddr < KERNBASE; vaddr += SUN4C_REAL_PGDIR_SIZE)
275 sun4c_put_segmap(vaddr, invalid_segment);
276 for (vaddr = kernel_end; vaddr < KADB_DEBUGGER_BEGVM; vaddr += SUN4C_REAL_PGDIR_SIZE)
277 sun4c_put_segmap(vaddr, invalid_segment);
278 for (vaddr = LINUX_OPPROM_ENDVM; vaddr; vaddr += SUN4C_REAL_PGDIR_SIZE)
279 sun4c_put_segmap(vaddr, invalid_segment);
280 }
281 sun4c_set_context(savectx);
282 }
283
284 void __init sun4c_probe_vac(void)
285 {
286 sun4c_disable_vac();
287
288 if (ARCH_SUN4) {
289 switch (idprom->id_machtype) {
290
291 case (SM_SUN4|SM_4_110):
292 sun4c_vacinfo.type = VAC_NONE;
293 sun4c_vacinfo.num_bytes = 0;
294 sun4c_vacinfo.linesize = 0;
295 sun4c_vacinfo.do_hwflushes = 0;
296 prom_printf("No VAC. Get some bucks and buy a real computer.");
297 prom_halt();
298 break;
299
300 case (SM_SUN4|SM_4_260):
301 sun4c_vacinfo.type = VAC_WRITE_BACK;
302 sun4c_vacinfo.num_bytes = 128 * 1024;
303 sun4c_vacinfo.linesize = 16;
304 sun4c_vacinfo.do_hwflushes = 0;
305 break;
306
307 case (SM_SUN4|SM_4_330):
308 sun4c_vacinfo.type = VAC_WRITE_THROUGH;
309 sun4c_vacinfo.num_bytes = 128 * 1024;
310 sun4c_vacinfo.linesize = 16;
311 sun4c_vacinfo.do_hwflushes = 0;
312 break;
313
314 case (SM_SUN4|SM_4_470):
315 sun4c_vacinfo.type = VAC_WRITE_BACK;
316 sun4c_vacinfo.num_bytes = 128 * 1024;
317 sun4c_vacinfo.linesize = 32;
318 sun4c_vacinfo.do_hwflushes = 0;
319 break;
320
321 default:
322 prom_printf("Cannot initialize VAC - weird sun4 model idprom->id_machtype = %d", idprom->id_machtype);
323 prom_halt();
324 };
325 } else {
326 sun4c_vacinfo.type = VAC_WRITE_THROUGH;
327
328 if ((idprom->id_machtype == (SM_SUN4C | SM_4C_SS1)) ||
329 (idprom->id_machtype == (SM_SUN4C | SM_4C_SS1PLUS))) {
330 /* PROM on SS1 lacks this info, to be super safe we
331 * hard code it here since this arch is cast in stone.
332 */
333 sun4c_vacinfo.num_bytes = 65536;
334 sun4c_vacinfo.linesize = 16;
335 } else {
336 sun4c_vacinfo.num_bytes =
337 prom_getintdefault(prom_root_node, "vac-size", 65536);
338 sun4c_vacinfo.linesize =
339 prom_getintdefault(prom_root_node, "vac-linesize", 16);
340 }
341 sun4c_vacinfo.do_hwflushes =
342 prom_getintdefault(prom_root_node, "vac-hwflush", 0);
343
344 if (sun4c_vacinfo.do_hwflushes == 0)
345 sun4c_vacinfo.do_hwflushes =
346 prom_getintdefault(prom_root_node, "vac_hwflush", 0);
347
348 if (sun4c_vacinfo.num_bytes != 65536) {
349 prom_printf("WEIRD Sun4C VAC cache size, "
350 "tell sparclinux@vger.kernel.org");
351 prom_halt();
352 }
353 }
354
355 sun4c_vacinfo.num_lines =
356 (sun4c_vacinfo.num_bytes / sun4c_vacinfo.linesize);
357 switch (sun4c_vacinfo.linesize) {
358 case 16:
359 sun4c_vacinfo.log2lsize = 4;
360 break;
361 case 32:
362 sun4c_vacinfo.log2lsize = 5;
363 break;
364 default:
365 prom_printf("probe_vac: Didn't expect vac-linesize of %d, halting\n",
366 sun4c_vacinfo.linesize);
367 prom_halt();
368 };
369
370 sun4c_flush_all();
371 sun4c_enable_vac();
372 }
373
374 /* Patch instructions for the low level kernel fault handler. */
375 extern unsigned long invalid_segment_patch1, invalid_segment_patch1_ff;
376 extern unsigned long invalid_segment_patch2, invalid_segment_patch2_ff;
377 extern unsigned long invalid_segment_patch1_1ff, invalid_segment_patch2_1ff;
378 extern unsigned long num_context_patch1, num_context_patch1_16;
379 extern unsigned long num_context_patch2_16;
380 extern unsigned long vac_linesize_patch, vac_linesize_patch_32;
381 extern unsigned long vac_hwflush_patch1, vac_hwflush_patch1_on;
382 extern unsigned long vac_hwflush_patch2, vac_hwflush_patch2_on;
383
384 #define PATCH_INSN(src, dst) do { \
385 daddr = &(dst); \
386 iaddr = &(src); \
387 *daddr = *iaddr; \
388 } while (0)
389
390 static void __init patch_kernel_fault_handler(void)
391 {
392 unsigned long *iaddr, *daddr;
393
394 switch (num_segmaps) {
395 case 128:
396 /* Default, nothing to do. */
397 break;
398 case 256:
399 PATCH_INSN(invalid_segment_patch1_ff,
400 invalid_segment_patch1);
401 PATCH_INSN(invalid_segment_patch2_ff,
402 invalid_segment_patch2);
403 break;
404 case 512:
405 PATCH_INSN(invalid_segment_patch1_1ff,
406 invalid_segment_patch1);
407 PATCH_INSN(invalid_segment_patch2_1ff,
408 invalid_segment_patch2);
409 break;
410 default:
411 prom_printf("Unhandled number of segmaps: %d\n",
412 num_segmaps);
413 prom_halt();
414 };
415 switch (num_contexts) {
416 case 8:
417 /* Default, nothing to do. */
418 break;
419 case 16:
420 PATCH_INSN(num_context_patch1_16,
421 num_context_patch1);
422 break;
423 default:
424 prom_printf("Unhandled number of contexts: %d\n",
425 num_contexts);
426 prom_halt();
427 };
428
429 if (sun4c_vacinfo.do_hwflushes != 0) {
430 PATCH_INSN(vac_hwflush_patch1_on, vac_hwflush_patch1);
431 PATCH_INSN(vac_hwflush_patch2_on, vac_hwflush_patch2);
432 } else {
433 switch (sun4c_vacinfo.linesize) {
434 case 16:
435 /* Default, nothing to do. */
436 break;
437 case 32:
438 PATCH_INSN(vac_linesize_patch_32, vac_linesize_patch);
439 break;
440 default:
441 prom_printf("Impossible VAC linesize %d, halting...\n",
442 sun4c_vacinfo.linesize);
443 prom_halt();
444 };
445 }
446 }
447
448 static void __init sun4c_probe_mmu(void)
449 {
450 if (ARCH_SUN4) {
451 switch (idprom->id_machtype) {
452 case (SM_SUN4|SM_4_110):
453 prom_printf("No support for 4100 yet\n");
454 prom_halt();
455 num_segmaps = 256;
456 num_contexts = 8;
457 break;
458
459 case (SM_SUN4|SM_4_260):
460 /* should be 512 segmaps. when it get fixed */
461 num_segmaps = 256;
462 num_contexts = 16;
463 break;
464
465 case (SM_SUN4|SM_4_330):
466 num_segmaps = 256;
467 num_contexts = 16;
468 break;
469
470 case (SM_SUN4|SM_4_470):
471 /* should be 1024 segmaps. when it get fixed */
472 num_segmaps = 256;
473 num_contexts = 64;
474 break;
475 default:
476 prom_printf("Invalid SUN4 model\n");
477 prom_halt();
478 };
479 } else {
480 if ((idprom->id_machtype == (SM_SUN4C | SM_4C_SS1)) ||
481 (idprom->id_machtype == (SM_SUN4C | SM_4C_SS1PLUS))) {
482 /* Hardcode these just to be safe, PROM on SS1 does
483 * not have this info available in the root node.
484 */
485 num_segmaps = 128;
486 num_contexts = 8;
487 } else {
488 num_segmaps =
489 prom_getintdefault(prom_root_node, "mmu-npmg", 128);
490 num_contexts =
491 prom_getintdefault(prom_root_node, "mmu-nctx", 0x8);
492 }
493 }
494 patch_kernel_fault_handler();
495 }
496
497 volatile unsigned long __iomem *sun4c_memerr_reg = NULL;
498
499 void __init sun4c_probe_memerr_reg(void)
500 {
501 int node;
502 struct linux_prom_registers regs[1];
503
504 if (ARCH_SUN4) {
505 sun4c_memerr_reg = ioremap(sun4_memreg_physaddr, PAGE_SIZE);
506 } else {
507 node = prom_getchild(prom_root_node);
508 node = prom_searchsiblings(prom_root_node, "memory-error");
509 if (!node)
510 return;
511 if (prom_getproperty(node, "reg", (char *)regs, sizeof(regs)) <= 0)
512 return;
513 /* hmm I think regs[0].which_io is zero here anyways */
514 sun4c_memerr_reg = ioremap(regs[0].phys_addr, regs[0].reg_size);
515 }
516 }
517
518 static inline void sun4c_init_ss2_cache_bug(void)
519 {
520 extern unsigned long start;
521
522 if ((idprom->id_machtype == (SM_SUN4C | SM_4C_SS2)) ||
523 (idprom->id_machtype == (SM_SUN4C | SM_4C_IPX)) ||
524 (idprom->id_machtype == (SM_SUN4 | SM_4_330)) ||
525 (idprom->id_machtype == (SM_SUN4C | SM_4C_ELC))) {
526 /* Whee.. */
527 printk("SS2 cache bug detected, uncaching trap table page\n");
528 sun4c_flush_page((unsigned int) &start);
529 sun4c_put_pte(((unsigned long) &start),
530 (sun4c_get_pte((unsigned long) &start) | _SUN4C_PAGE_NOCACHE));
531 }
532 }
533
534 /* Addr is always aligned on a page boundary for us already. */
535 static int sun4c_map_dma_area(dma_addr_t *pba, unsigned long va,
536 unsigned long addr, int len)
537 {
538 unsigned long page, end;
539
540 *pba = addr;
541
542 end = PAGE_ALIGN((addr + len));
543 while (addr < end) {
544 page = va;
545 sun4c_flush_page(page);
546 page -= PAGE_OFFSET;
547 page >>= PAGE_SHIFT;
548 page |= (_SUN4C_PAGE_VALID | _SUN4C_PAGE_DIRTY |
549 _SUN4C_PAGE_NOCACHE | _SUN4C_PAGE_PRIV);
550 sun4c_put_pte(addr, page);
551 addr += PAGE_SIZE;
552 va += PAGE_SIZE;
553 }
554
555 return 0;
556 }
557
558 static struct page *sun4c_translate_dvma(unsigned long busa)
559 {
560 /* Fortunately for us, bus_addr == uncached_virt in sun4c. */
561 unsigned long pte = sun4c_get_pte(busa);
562 return pfn_to_page(pte & SUN4C_PFN_MASK);
563 }
564
565 static void sun4c_unmap_dma_area(unsigned long busa, int len)
566 {
567 /* Fortunately for us, bus_addr == uncached_virt in sun4c. */
568 /* XXX Implement this */
569 }
570
571 /* TLB management. */
572
573 /* Don't change this struct without changing entry.S. This is used
574 * in the in-window kernel fault handler, and you don't want to mess
575 * with that. (See sun4c_fault in entry.S).
576 */
577 struct sun4c_mmu_entry {
578 struct sun4c_mmu_entry *next;
579 struct sun4c_mmu_entry *prev;
580 unsigned long vaddr;
581 unsigned char pseg;
582 unsigned char locked;
583
584 /* For user mappings only, and completely hidden from kernel
585 * TLB miss code.
586 */
587 unsigned char ctx;
588 struct sun4c_mmu_entry *lru_next;
589 struct sun4c_mmu_entry *lru_prev;
590 };
591
592 static struct sun4c_mmu_entry mmu_entry_pool[SUN4C_MAX_SEGMAPS];
593
594 static void __init sun4c_init_mmu_entry_pool(void)
595 {
596 int i;
597
598 for (i=0; i < SUN4C_MAX_SEGMAPS; i++) {
599 mmu_entry_pool[i].pseg = i;
600 mmu_entry_pool[i].next = NULL;
601 mmu_entry_pool[i].prev = NULL;
602 mmu_entry_pool[i].vaddr = 0;
603 mmu_entry_pool[i].locked = 0;
604 mmu_entry_pool[i].ctx = 0;
605 mmu_entry_pool[i].lru_next = NULL;
606 mmu_entry_pool[i].lru_prev = NULL;
607 }
608 mmu_entry_pool[invalid_segment].locked = 1;
609 }
610
611 static inline void fix_permissions(unsigned long vaddr, unsigned long bits_on,
612 unsigned long bits_off)
613 {
614 unsigned long start, end;
615
616 end = vaddr + SUN4C_REAL_PGDIR_SIZE;
617 for (start = vaddr; start < end; start += PAGE_SIZE)
618 if (sun4c_get_pte(start) & _SUN4C_PAGE_VALID)
619 sun4c_put_pte(start, (sun4c_get_pte(start) | bits_on) &
620 ~bits_off);
621 }
622
623 static inline void sun4c_init_map_kernelprom(unsigned long kernel_end)
624 {
625 unsigned long vaddr;
626 unsigned char pseg, ctx;
627 #ifdef CONFIG_SUN4
628 /* sun4/110 and 260 have no kadb. */
629 if ((idprom->id_machtype != (SM_SUN4 | SM_4_260)) &&
630 (idprom->id_machtype != (SM_SUN4 | SM_4_110))) {
631 #endif
632 for (vaddr = KADB_DEBUGGER_BEGVM;
633 vaddr < LINUX_OPPROM_ENDVM;
634 vaddr += SUN4C_REAL_PGDIR_SIZE) {
635 pseg = sun4c_get_segmap(vaddr);
636 if (pseg != invalid_segment) {
637 mmu_entry_pool[pseg].locked = 1;
638 for (ctx = 0; ctx < num_contexts; ctx++)
639 prom_putsegment(ctx, vaddr, pseg);
640 fix_permissions(vaddr, _SUN4C_PAGE_PRIV, 0);
641 }
642 }
643 #ifdef CONFIG_SUN4
644 }
645 #endif
646 for (vaddr = KERNBASE; vaddr < kernel_end; vaddr += SUN4C_REAL_PGDIR_SIZE) {
647 pseg = sun4c_get_segmap(vaddr);
648 mmu_entry_pool[pseg].locked = 1;
649 for (ctx = 0; ctx < num_contexts; ctx++)
650 prom_putsegment(ctx, vaddr, pseg);
651 fix_permissions(vaddr, _SUN4C_PAGE_PRIV, _SUN4C_PAGE_NOCACHE);
652 }
653 }
654
655 static void __init sun4c_init_lock_area(unsigned long start, unsigned long end)
656 {
657 int i, ctx;
658
659 while (start < end) {
660 for (i = 0; i < invalid_segment; i++)
661 if (!mmu_entry_pool[i].locked)
662 break;
663 mmu_entry_pool[i].locked = 1;
664 sun4c_init_clean_segmap(i);
665 for (ctx = 0; ctx < num_contexts; ctx++)
666 prom_putsegment(ctx, start, mmu_entry_pool[i].pseg);
667 start += SUN4C_REAL_PGDIR_SIZE;
668 }
669 }
670
671 /* Don't change this struct without changing entry.S. This is used
672 * in the in-window kernel fault handler, and you don't want to mess
673 * with that. (See sun4c_fault in entry.S).
674 */
675 struct sun4c_mmu_ring {
676 struct sun4c_mmu_entry ringhd;
677 int num_entries;
678 };
679
680 static struct sun4c_mmu_ring sun4c_context_ring[SUN4C_MAX_CONTEXTS]; /* used user entries */
681 static struct sun4c_mmu_ring sun4c_ufree_ring; /* free user entries */
682 static struct sun4c_mmu_ring sun4c_ulru_ring; /* LRU user entries */
683 struct sun4c_mmu_ring sun4c_kernel_ring; /* used kernel entries */
684 struct sun4c_mmu_ring sun4c_kfree_ring; /* free kernel entries */
685
686 static inline void sun4c_init_rings(void)
687 {
688 int i;
689
690 for (i = 0; i < SUN4C_MAX_CONTEXTS; i++) {
691 sun4c_context_ring[i].ringhd.next =
692 sun4c_context_ring[i].ringhd.prev =
693 &sun4c_context_ring[i].ringhd;
694 sun4c_context_ring[i].num_entries = 0;
695 }
696 sun4c_ufree_ring.ringhd.next = sun4c_ufree_ring.ringhd.prev =
697 &sun4c_ufree_ring.ringhd;
698 sun4c_ufree_ring.num_entries = 0;
699 sun4c_ulru_ring.ringhd.lru_next = sun4c_ulru_ring.ringhd.lru_prev =
700 &sun4c_ulru_ring.ringhd;
701 sun4c_ulru_ring.num_entries = 0;
702 sun4c_kernel_ring.ringhd.next = sun4c_kernel_ring.ringhd.prev =
703 &sun4c_kernel_ring.ringhd;
704 sun4c_kernel_ring.num_entries = 0;
705 sun4c_kfree_ring.ringhd.next = sun4c_kfree_ring.ringhd.prev =
706 &sun4c_kfree_ring.ringhd;
707 sun4c_kfree_ring.num_entries = 0;
708 }
709
710 static void add_ring(struct sun4c_mmu_ring *ring,
711 struct sun4c_mmu_entry *entry)
712 {
713 struct sun4c_mmu_entry *head = &ring->ringhd;
714
715 entry->prev = head;
716 (entry->next = head->next)->prev = entry;
717 head->next = entry;
718 ring->num_entries++;
719 }
720
721 static inline void add_lru(struct sun4c_mmu_entry *entry)
722 {
723 struct sun4c_mmu_ring *ring = &sun4c_ulru_ring;
724 struct sun4c_mmu_entry *head = &ring->ringhd;
725
726 entry->lru_next = head;
727 (entry->lru_prev = head->lru_prev)->lru_next = entry;
728 head->lru_prev = entry;
729 }
730
731 static void add_ring_ordered(struct sun4c_mmu_ring *ring,
732 struct sun4c_mmu_entry *entry)
733 {
734 struct sun4c_mmu_entry *head = &ring->ringhd;
735 unsigned long addr = entry->vaddr;
736
737 while ((head->next != &ring->ringhd) && (head->next->vaddr < addr))
738 head = head->next;
739
740 entry->prev = head;
741 (entry->next = head->next)->prev = entry;
742 head->next = entry;
743 ring->num_entries++;
744
745 add_lru(entry);
746 }
747
748 static inline void remove_ring(struct sun4c_mmu_ring *ring,
749 struct sun4c_mmu_entry *entry)
750 {
751 struct sun4c_mmu_entry *next = entry->next;
752
753 (next->prev = entry->prev)->next = next;
754 ring->num_entries--;
755 }
756
757 static void remove_lru(struct sun4c_mmu_entry *entry)
758 {
759 struct sun4c_mmu_entry *next = entry->lru_next;
760
761 (next->lru_prev = entry->lru_prev)->lru_next = next;
762 }
763
764 static void free_user_entry(int ctx, struct sun4c_mmu_entry *entry)
765 {
766 remove_ring(sun4c_context_ring+ctx, entry);
767 remove_lru(entry);
768 add_ring(&sun4c_ufree_ring, entry);
769 }
770
771 static void free_kernel_entry(struct sun4c_mmu_entry *entry,
772 struct sun4c_mmu_ring *ring)
773 {
774 remove_ring(ring, entry);
775 add_ring(&sun4c_kfree_ring, entry);
776 }
777
778 static void __init sun4c_init_fill_kernel_ring(int howmany)
779 {
780 int i;
781
782 while (howmany) {
783 for (i = 0; i < invalid_segment; i++)
784 if (!mmu_entry_pool[i].locked)
785 break;
786 mmu_entry_pool[i].locked = 1;
787 sun4c_init_clean_segmap(i);
788 add_ring(&sun4c_kfree_ring, &mmu_entry_pool[i]);
789 howmany--;
790 }
791 }
792
793 static void __init sun4c_init_fill_user_ring(void)
794 {
795 int i;
796
797 for (i = 0; i < invalid_segment; i++) {
798 if (mmu_entry_pool[i].locked)
799 continue;
800 sun4c_init_clean_segmap(i);
801 add_ring(&sun4c_ufree_ring, &mmu_entry_pool[i]);
802 }
803 }
804
805 static void sun4c_kernel_unmap(struct sun4c_mmu_entry *kentry)
806 {
807 int savectx, ctx;
808
809 savectx = sun4c_get_context();
810 for (ctx = 0; ctx < num_contexts; ctx++) {
811 sun4c_set_context(ctx);
812 sun4c_put_segmap(kentry->vaddr, invalid_segment);
813 }
814 sun4c_set_context(savectx);
815 }
816
817 static void sun4c_kernel_map(struct sun4c_mmu_entry *kentry)
818 {
819 int savectx, ctx;
820
821 savectx = sun4c_get_context();
822 for (ctx = 0; ctx < num_contexts; ctx++) {
823 sun4c_set_context(ctx);
824 sun4c_put_segmap(kentry->vaddr, kentry->pseg);
825 }
826 sun4c_set_context(savectx);
827 }
828
829 #define sun4c_user_unmap(__entry) \
830 sun4c_put_segmap((__entry)->vaddr, invalid_segment)
831
832 static void sun4c_demap_context(struct sun4c_mmu_ring *crp, unsigned char ctx)
833 {
834 struct sun4c_mmu_entry *head = &crp->ringhd;
835 unsigned long flags;
836
837 local_irq_save(flags);
838 if (head->next != head) {
839 struct sun4c_mmu_entry *entry = head->next;
840 int savectx = sun4c_get_context();
841
842 flush_user_windows();
843 sun4c_set_context(ctx);
844 sun4c_flush_context();
845 do {
846 struct sun4c_mmu_entry *next = entry->next;
847
848 sun4c_user_unmap(entry);
849 free_user_entry(ctx, entry);
850
851 entry = next;
852 } while (entry != head);
853 sun4c_set_context(savectx);
854 }
855 local_irq_restore(flags);
856 }
857
858 static int sun4c_user_taken_entries; /* This is how much we have. */
859 static int max_user_taken_entries; /* This limits us and prevents deadlock. */
860
861 static struct sun4c_mmu_entry *sun4c_kernel_strategy(void)
862 {
863 struct sun4c_mmu_entry *this_entry;
864
865 /* If some are free, return first one. */
866 if (sun4c_kfree_ring.num_entries) {
867 this_entry = sun4c_kfree_ring.ringhd.next;
868 return this_entry;
869 }
870
871 /* Else free one up. */
872 this_entry = sun4c_kernel_ring.ringhd.prev;
873 sun4c_flush_segment(this_entry->vaddr);
874 sun4c_kernel_unmap(this_entry);
875 free_kernel_entry(this_entry, &sun4c_kernel_ring);
876 this_entry = sun4c_kfree_ring.ringhd.next;
877
878 return this_entry;
879 }
880
881 /* Using this method to free up mmu entries eliminates a lot of
882 * potential races since we have a kernel that incurs tlb
883 * replacement faults. There may be performance penalties.
884 *
885 * NOTE: Must be called with interrupts disabled.
886 */
887 static struct sun4c_mmu_entry *sun4c_user_strategy(void)
888 {
889 struct sun4c_mmu_entry *entry;
890 unsigned char ctx;
891 int savectx;
892
893 /* If some are free, return first one. */
894 if (sun4c_ufree_ring.num_entries) {
895 entry = sun4c_ufree_ring.ringhd.next;
896 goto unlink_out;
897 }
898
899 if (sun4c_user_taken_entries) {
900 entry = sun4c_kernel_strategy();
901 sun4c_user_taken_entries--;
902 goto kunlink_out;
903 }
904
905 /* Grab from the beginning of the LRU list. */
906 entry = sun4c_ulru_ring.ringhd.lru_next;
907 ctx = entry->ctx;
908
909 savectx = sun4c_get_context();
910 flush_user_windows();
911 sun4c_set_context(ctx);
912 sun4c_flush_segment(entry->vaddr);
913 sun4c_user_unmap(entry);
914 remove_ring(sun4c_context_ring + ctx, entry);
915 remove_lru(entry);
916 sun4c_set_context(savectx);
917
918 return entry;
919
920 unlink_out:
921 remove_ring(&sun4c_ufree_ring, entry);
922 return entry;
923 kunlink_out:
924 remove_ring(&sun4c_kfree_ring, entry);
925 return entry;
926 }
927
928 /* NOTE: Must be called with interrupts disabled. */
929 void sun4c_grow_kernel_ring(void)
930 {
931 struct sun4c_mmu_entry *entry;
932
933 /* Prevent deadlock condition. */
934 if (sun4c_user_taken_entries >= max_user_taken_entries)
935 return;
936
937 if (sun4c_ufree_ring.num_entries) {
938 entry = sun4c_ufree_ring.ringhd.next;
939 remove_ring(&sun4c_ufree_ring, entry);
940 add_ring(&sun4c_kfree_ring, entry);
941 sun4c_user_taken_entries++;
942 }
943 }
944
945 /* 2 page buckets for task struct and kernel stack allocation.
946 *
947 * TASK_STACK_BEGIN
948 * bucket[0]
949 * bucket[1]
950 * [ ... ]
951 * bucket[NR_TASK_BUCKETS-1]
952 * TASK_STACK_BEGIN + (sizeof(struct task_bucket) * NR_TASK_BUCKETS)
953 *
954 * Each slot looks like:
955 *
956 * page 1 -- task struct + beginning of kernel stack
957 * page 2 -- rest of kernel stack
958 */
959
960 union task_union *sun4c_bucket[NR_TASK_BUCKETS];
961
962 static int sun4c_lowbucket_avail;
963
964 #define BUCKET_EMPTY ((union task_union *) 0)
965 #define BUCKET_SHIFT (PAGE_SHIFT + 1) /* log2(sizeof(struct task_bucket)) */
966 #define BUCKET_SIZE (1 << BUCKET_SHIFT)
967 #define BUCKET_NUM(addr) ((((addr) - SUN4C_LOCK_VADDR) >> BUCKET_SHIFT))
968 #define BUCKET_ADDR(num) (((num) << BUCKET_SHIFT) + SUN4C_LOCK_VADDR)
969 #define BUCKET_PTE(page) \
970 ((((page) - PAGE_OFFSET) >> PAGE_SHIFT) | pgprot_val(SUN4C_PAGE_KERNEL))
971 #define BUCKET_PTE_PAGE(pte) \
972 (PAGE_OFFSET + (((pte) & SUN4C_PFN_MASK) << PAGE_SHIFT))
973
974 static void get_locked_segment(unsigned long addr)
975 {
976 struct sun4c_mmu_entry *stolen;
977 unsigned long flags;
978
979 local_irq_save(flags);
980 addr &= SUN4C_REAL_PGDIR_MASK;
981 stolen = sun4c_user_strategy();
982 max_user_taken_entries--;
983 stolen->vaddr = addr;
984 flush_user_windows();
985 sun4c_kernel_map(stolen);
986 local_irq_restore(flags);
987 }
988
989 static void free_locked_segment(unsigned long addr)
990 {
991 struct sun4c_mmu_entry *entry;
992 unsigned long flags;
993 unsigned char pseg;
994
995 local_irq_save(flags);
996 addr &= SUN4C_REAL_PGDIR_MASK;
997 pseg = sun4c_get_segmap(addr);
998 entry = &mmu_entry_pool[pseg];
999
1000 flush_user_windows();
1001 sun4c_flush_segment(addr);
1002 sun4c_kernel_unmap(entry);
1003 add_ring(&sun4c_ufree_ring, entry);
1004 max_user_taken_entries++;
1005 local_irq_restore(flags);
1006 }
1007
1008 static inline void garbage_collect(int entry)
1009 {
1010 int start, end;
1011
1012 /* 32 buckets per segment... */
1013 entry &= ~31;
1014 start = entry;
1015 for (end = (start + 32); start < end; start++)
1016 if (sun4c_bucket[start] != BUCKET_EMPTY)
1017 return;
1018
1019 /* Entire segment empty, release it. */
1020 free_locked_segment(BUCKET_ADDR(entry));
1021 }
1022
1023 static struct thread_info *sun4c_alloc_thread_info(void)
1024 {
1025 unsigned long addr, pages;
1026 int entry;
1027
1028 pages = __get_free_pages(GFP_KERNEL, THREAD_INFO_ORDER);
1029 if (!pages)
1030 return NULL;
1031
1032 for (entry = sun4c_lowbucket_avail; entry < NR_TASK_BUCKETS; entry++)
1033 if (sun4c_bucket[entry] == BUCKET_EMPTY)
1034 break;
1035 if (entry == NR_TASK_BUCKETS) {
1036 free_pages(pages, THREAD_INFO_ORDER);
1037 return NULL;
1038 }
1039 if (entry >= sun4c_lowbucket_avail)
1040 sun4c_lowbucket_avail = entry + 1;
1041
1042 addr = BUCKET_ADDR(entry);
1043 sun4c_bucket[entry] = (union task_union *) addr;
1044 if(sun4c_get_segmap(addr) == invalid_segment)
1045 get_locked_segment(addr);
1046
1047 /* We are changing the virtual color of the page(s)
1048 * so we must flush the cache to guarantee consistency.
1049 */
1050 sun4c_flush_page(pages);
1051 #ifndef CONFIG_SUN4
1052 sun4c_flush_page(pages + PAGE_SIZE);
1053 #endif
1054
1055 sun4c_put_pte(addr, BUCKET_PTE(pages));
1056 #ifndef CONFIG_SUN4
1057 sun4c_put_pte(addr + PAGE_SIZE, BUCKET_PTE(pages + PAGE_SIZE));
1058 #endif
1059
1060 #ifdef CONFIG_DEBUG_STACK_USAGE
1061 memset((void *)addr, 0, PAGE_SIZE << THREAD_INFO_ORDER);
1062 #endif /* DEBUG_STACK_USAGE */
1063
1064 return (struct thread_info *) addr;
1065 }
1066
1067 static void sun4c_free_thread_info(struct thread_info *ti)
1068 {
1069 unsigned long tiaddr = (unsigned long) ti;
1070 unsigned long pages = BUCKET_PTE_PAGE(sun4c_get_pte(tiaddr));
1071 int entry = BUCKET_NUM(tiaddr);
1072
1073 /* We are deleting a mapping, so the flush here is mandatory. */
1074 sun4c_flush_page(tiaddr);
1075 #ifndef CONFIG_SUN4
1076 sun4c_flush_page(tiaddr + PAGE_SIZE);
1077 #endif
1078 sun4c_put_pte(tiaddr, 0);
1079 #ifndef CONFIG_SUN4
1080 sun4c_put_pte(tiaddr + PAGE_SIZE, 0);
1081 #endif
1082 sun4c_bucket[entry] = BUCKET_EMPTY;
1083 if (entry < sun4c_lowbucket_avail)
1084 sun4c_lowbucket_avail = entry;
1085
1086 free_pages(pages, THREAD_INFO_ORDER);
1087 garbage_collect(entry);
1088 }
1089
1090 static void __init sun4c_init_buckets(void)
1091 {
1092 int entry;
1093
1094 if (sizeof(union thread_union) != (PAGE_SIZE << THREAD_INFO_ORDER)) {
1095 extern void thread_info_size_is_bolixed_pete(void);
1096 thread_info_size_is_bolixed_pete();
1097 }
1098
1099 for (entry = 0; entry < NR_TASK_BUCKETS; entry++)
1100 sun4c_bucket[entry] = BUCKET_EMPTY;
1101 sun4c_lowbucket_avail = 0;
1102 }
1103
1104 static unsigned long sun4c_iobuffer_start;
1105 static unsigned long sun4c_iobuffer_end;
1106 static unsigned long sun4c_iobuffer_high;
1107 static unsigned long *sun4c_iobuffer_map;
1108 static int iobuffer_map_size;
1109
1110 /*
1111 * Alias our pages so they do not cause a trap.
1112 * Also one page may be aliased into several I/O areas and we may
1113 * finish these I/O separately.
1114 */
1115 static char *sun4c_lockarea(char *vaddr, unsigned long size)
1116 {
1117 unsigned long base, scan;
1118 unsigned long npages;
1119 unsigned long vpage;
1120 unsigned long pte;
1121 unsigned long apage;
1122 unsigned long high;
1123 unsigned long flags;
1124
1125 npages = (((unsigned long)vaddr & ~PAGE_MASK) +
1126 size + (PAGE_SIZE-1)) >> PAGE_SHIFT;
1127
1128 scan = 0;
1129 local_irq_save(flags);
1130 for (;;) {
1131 scan = find_next_zero_bit(sun4c_iobuffer_map,
1132 iobuffer_map_size, scan);
1133 if ((base = scan) + npages > iobuffer_map_size) goto abend;
1134 for (;;) {
1135 if (scan >= base + npages) goto found;
1136 if (test_bit(scan, sun4c_iobuffer_map)) break;
1137 scan++;
1138 }
1139 }
1140
1141 found:
1142 high = ((base + npages) << PAGE_SHIFT) + sun4c_iobuffer_start;
1143 high = SUN4C_REAL_PGDIR_ALIGN(high);
1144 while (high > sun4c_iobuffer_high) {
1145 get_locked_segment(sun4c_iobuffer_high);
1146 sun4c_iobuffer_high += SUN4C_REAL_PGDIR_SIZE;
1147 }
1148
1149 vpage = ((unsigned long) vaddr) & PAGE_MASK;
1150 for (scan = base; scan < base+npages; scan++) {
1151 pte = ((vpage-PAGE_OFFSET) >> PAGE_SHIFT);
1152 pte |= pgprot_val(SUN4C_PAGE_KERNEL);
1153 pte |= _SUN4C_PAGE_NOCACHE;
1154 set_bit(scan, sun4c_iobuffer_map);
1155 apage = (scan << PAGE_SHIFT) + sun4c_iobuffer_start;
1156
1157 /* Flush original mapping so we see the right things later. */
1158 sun4c_flush_page(vpage);
1159
1160 sun4c_put_pte(apage, pte);
1161 vpage += PAGE_SIZE;
1162 }
1163 local_irq_restore(flags);
1164 return (char *) ((base << PAGE_SHIFT) + sun4c_iobuffer_start +
1165 (((unsigned long) vaddr) & ~PAGE_MASK));
1166
1167 abend:
1168 local_irq_restore(flags);
1169 printk("DMA vaddr=0x%p size=%08lx\n", vaddr, size);
1170 panic("Out of iobuffer table");
1171 return NULL;
1172 }
1173
1174 static void sun4c_unlockarea(char *vaddr, unsigned long size)
1175 {
1176 unsigned long vpage, npages;
1177 unsigned long flags;
1178 int scan, high;
1179
1180 vpage = (unsigned long)vaddr & PAGE_MASK;
1181 npages = (((unsigned long)vaddr & ~PAGE_MASK) +
1182 size + (PAGE_SIZE-1)) >> PAGE_SHIFT;
1183
1184 local_irq_save(flags);
1185 while (npages != 0) {
1186 --npages;
1187
1188 /* This mapping is marked non-cachable, no flush necessary. */
1189 sun4c_put_pte(vpage, 0);
1190 clear_bit((vpage - sun4c_iobuffer_start) >> PAGE_SHIFT,
1191 sun4c_iobuffer_map);
1192 vpage += PAGE_SIZE;
1193 }
1194
1195 /* garbage collect */
1196 scan = (sun4c_iobuffer_high - sun4c_iobuffer_start) >> PAGE_SHIFT;
1197 while (scan >= 0 && !sun4c_iobuffer_map[scan >> 5])
1198 scan -= 32;
1199 scan += 32;
1200 high = sun4c_iobuffer_start + (scan << PAGE_SHIFT);
1201 high = SUN4C_REAL_PGDIR_ALIGN(high) + SUN4C_REAL_PGDIR_SIZE;
1202 while (high < sun4c_iobuffer_high) {
1203 sun4c_iobuffer_high -= SUN4C_REAL_PGDIR_SIZE;
1204 free_locked_segment(sun4c_iobuffer_high);
1205 }
1206 local_irq_restore(flags);
1207 }
1208
1209 /* Note the scsi code at init time passes to here buffers
1210 * which sit on the kernel stack, those are already locked
1211 * by implication and fool the page locking code above
1212 * if passed to by mistake.
1213 */
1214 static __u32 sun4c_get_scsi_one(char *bufptr, unsigned long len, struct sbus_bus *sbus)
1215 {
1216 unsigned long page;
1217
1218 page = ((unsigned long)bufptr) & PAGE_MASK;
1219 if (!virt_addr_valid(page)) {
1220 sun4c_flush_page(page);
1221 return (__u32)bufptr; /* already locked */
1222 }
1223 return (__u32)sun4c_lockarea(bufptr, len);
1224 }
1225
1226 static void sun4c_get_scsi_sgl(struct scatterlist *sg, int sz, struct sbus_bus *sbus)
1227 {
1228 while (sz != 0) {
1229 --sz;
1230 sg->dvma_address = (__u32)sun4c_lockarea(sg_virt(sg), sg->length);
1231 sg->dvma_length = sg->length;
1232 sg = sg_next(sg);
1233 }
1234 }
1235
1236 static void sun4c_release_scsi_one(__u32 bufptr, unsigned long len, struct sbus_bus *sbus)
1237 {
1238 if (bufptr < sun4c_iobuffer_start)
1239 return; /* On kernel stack or similar, see above */
1240 sun4c_unlockarea((char *)bufptr, len);
1241 }
1242
1243 static void sun4c_release_scsi_sgl(struct scatterlist *sg, int sz, struct sbus_bus *sbus)
1244 {
1245 while (sz != 0) {
1246 --sz;
1247 sun4c_unlockarea((char *)sg->dvma_address, sg->length);
1248 sg = sg_next(sg);
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_pmd_bad(pmd_t pmd)
1752 {
1753 return (((pmd_val(pmd) & ~PAGE_MASK) != PGD_TABLE) ||
1754 (!virt_addr_valid(pmd_val(pmd))));
1755 }
1756
1757 static int sun4c_pmd_present(pmd_t pmd)
1758 {
1759 return ((pmd_val(pmd) & PGD_PRESENT) != 0);
1760 }
1761
1762 #if 0 /* if PMD takes one word */
1763 static void sun4c_pmd_clear(pmd_t *pmdp) { *pmdp = __pmd(0); }
1764 #else /* if pmd_t is a longish aggregate */
1765 static void sun4c_pmd_clear(pmd_t *pmdp) {
1766 memset((void *)pmdp, 0, sizeof(pmd_t));
1767 }
1768 #endif
1769
1770 static int sun4c_pgd_none(pgd_t pgd) { return 0; }
1771 static int sun4c_pgd_bad(pgd_t pgd) { return 0; }
1772 static int sun4c_pgd_present(pgd_t pgd) { return 1; }
1773 static void sun4c_pgd_clear(pgd_t * pgdp) { }
1774
1775 /*
1776 * The following only work if pte_present() is true.
1777 * Undefined behaviour if not..
1778 */
1779 static pte_t sun4c_pte_mkwrite(pte_t pte)
1780 {
1781 pte = __pte(pte_val(pte) | _SUN4C_PAGE_WRITE);
1782 if (pte_val(pte) & _SUN4C_PAGE_MODIFIED)
1783 pte = __pte(pte_val(pte) | _SUN4C_PAGE_SILENT_WRITE);
1784 return pte;
1785 }
1786
1787 static pte_t sun4c_pte_mkdirty(pte_t pte)
1788 {
1789 pte = __pte(pte_val(pte) | _SUN4C_PAGE_MODIFIED);
1790 if (pte_val(pte) & _SUN4C_PAGE_WRITE)
1791 pte = __pte(pte_val(pte) | _SUN4C_PAGE_SILENT_WRITE);
1792 return pte;
1793 }
1794
1795 static pte_t sun4c_pte_mkyoung(pte_t pte)
1796 {
1797 pte = __pte(pte_val(pte) | _SUN4C_PAGE_ACCESSED);
1798 if (pte_val(pte) & _SUN4C_PAGE_READ)
1799 pte = __pte(pte_val(pte) | _SUN4C_PAGE_SILENT_READ);
1800 return pte;
1801 }
1802
1803 /*
1804 * Conversion functions: convert a page and protection to a page entry,
1805 * and a page entry and page directory to the page they refer to.
1806 */
1807 static pte_t sun4c_mk_pte(struct page *page, pgprot_t pgprot)
1808 {
1809 return __pte(page_to_pfn(page) | pgprot_val(pgprot));
1810 }
1811
1812 static pte_t sun4c_mk_pte_phys(unsigned long phys_page, pgprot_t pgprot)
1813 {
1814 return __pte((phys_page >> PAGE_SHIFT) | pgprot_val(pgprot));
1815 }
1816
1817 static pte_t sun4c_mk_pte_io(unsigned long page, pgprot_t pgprot, int space)
1818 {
1819 return __pte(((page - PAGE_OFFSET) >> PAGE_SHIFT) | pgprot_val(pgprot));
1820 }
1821
1822 static unsigned long sun4c_pte_pfn(pte_t pte)
1823 {
1824 return pte_val(pte) & SUN4C_PFN_MASK;
1825 }
1826
1827 static pte_t sun4c_pgoff_to_pte(unsigned long pgoff)
1828 {
1829 return __pte(pgoff | _SUN4C_PAGE_FILE);
1830 }
1831
1832 static unsigned long sun4c_pte_to_pgoff(pte_t pte)
1833 {
1834 return pte_val(pte) & ((1UL << PTE_FILE_MAX_BITS) - 1);
1835 }
1836
1837
1838 static inline unsigned long sun4c_pmd_page_v(pmd_t pmd)
1839 {
1840 return (pmd_val(pmd) & PAGE_MASK);
1841 }
1842
1843 static struct page *sun4c_pmd_page(pmd_t pmd)
1844 {
1845 return virt_to_page(sun4c_pmd_page_v(pmd));
1846 }
1847
1848 static unsigned long sun4c_pgd_page(pgd_t pgd) { return 0; }
1849
1850 /* to find an entry in a page-table-directory */
1851 static inline pgd_t *sun4c_pgd_offset(struct mm_struct * mm, unsigned long address)
1852 {
1853 return mm->pgd + (address >> SUN4C_PGDIR_SHIFT);
1854 }
1855
1856 /* Find an entry in the second-level page table.. */
1857 static pmd_t *sun4c_pmd_offset(pgd_t * dir, unsigned long address)
1858 {
1859 return (pmd_t *) dir;
1860 }
1861
1862 /* Find an entry in the third-level page table.. */
1863 pte_t *sun4c_pte_offset_kernel(pmd_t * dir, unsigned long address)
1864 {
1865 return (pte_t *) sun4c_pmd_page_v(*dir) +
1866 ((address >> PAGE_SHIFT) & (SUN4C_PTRS_PER_PTE - 1));
1867 }
1868
1869 static unsigned long sun4c_swp_type(swp_entry_t entry)
1870 {
1871 return (entry.val & SUN4C_SWP_TYPE_MASK);
1872 }
1873
1874 static unsigned long sun4c_swp_offset(swp_entry_t entry)
1875 {
1876 return (entry.val >> SUN4C_SWP_OFF_SHIFT) & SUN4C_SWP_OFF_MASK;
1877 }
1878
1879 static swp_entry_t sun4c_swp_entry(unsigned long type, unsigned long offset)
1880 {
1881 return (swp_entry_t) {
1882 (offset & SUN4C_SWP_OFF_MASK) << SUN4C_SWP_OFF_SHIFT
1883 | (type & SUN4C_SWP_TYPE_MASK) };
1884 }
1885
1886 static void sun4c_free_pte_slow(pte_t *pte)
1887 {
1888 free_page((unsigned long)pte);
1889 }
1890
1891 static void sun4c_free_pgd_slow(pgd_t *pgd)
1892 {
1893 free_page((unsigned long)pgd);
1894 }
1895
1896 static pgd_t *sun4c_get_pgd_fast(void)
1897 {
1898 unsigned long *ret;
1899
1900 if ((ret = pgd_quicklist) != NULL) {
1901 pgd_quicklist = (unsigned long *)(*ret);
1902 ret[0] = ret[1];
1903 pgtable_cache_size--;
1904 } else {
1905 pgd_t *init;
1906
1907 ret = (unsigned long *)__get_free_page(GFP_KERNEL);
1908 memset (ret, 0, (KERNBASE / SUN4C_PGDIR_SIZE) * sizeof(pgd_t));
1909 init = sun4c_pgd_offset(&init_mm, 0);
1910 memcpy (((pgd_t *)ret) + USER_PTRS_PER_PGD, init + USER_PTRS_PER_PGD,
1911 (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
1912 }
1913 return (pgd_t *)ret;
1914 }
1915
1916 static void sun4c_free_pgd_fast(pgd_t *pgd)
1917 {
1918 *(unsigned long *)pgd = (unsigned long) pgd_quicklist;
1919 pgd_quicklist = (unsigned long *) pgd;
1920 pgtable_cache_size++;
1921 }
1922
1923
1924 static inline pte_t *
1925 sun4c_pte_alloc_one_fast(struct mm_struct *mm, unsigned long address)
1926 {
1927 unsigned long *ret;
1928
1929 if ((ret = (unsigned long *)pte_quicklist) != NULL) {
1930 pte_quicklist = (unsigned long *)(*ret);
1931 ret[0] = ret[1];
1932 pgtable_cache_size--;
1933 }
1934 return (pte_t *)ret;
1935 }
1936
1937 static pte_t *sun4c_pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)
1938 {
1939 pte_t *pte;
1940
1941 if ((pte = sun4c_pte_alloc_one_fast(mm, address)) != NULL)
1942 return pte;
1943
1944 pte = (pte_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT);
1945 if (pte)
1946 memset(pte, 0, PAGE_SIZE);
1947 return pte;
1948 }
1949
1950 static struct page *sun4c_pte_alloc_one(struct mm_struct *mm, unsigned long address)
1951 {
1952 pte_t *pte = sun4c_pte_alloc_one_kernel(mm, address);
1953 if (pte == NULL)
1954 return NULL;
1955 return virt_to_page(pte);
1956 }
1957
1958 static inline void sun4c_free_pte_fast(pte_t *pte)
1959 {
1960 *(unsigned long *)pte = (unsigned long) pte_quicklist;
1961 pte_quicklist = (unsigned long *) pte;
1962 pgtable_cache_size++;
1963 }
1964
1965 static void sun4c_pte_free(struct page *pte)
1966 {
1967 sun4c_free_pte_fast(page_address(pte));
1968 }
1969
1970 /*
1971 * allocating and freeing a pmd is trivial: the 1-entry pmd is
1972 * inside the pgd, so has no extra memory associated with it.
1973 */
1974 static pmd_t *sun4c_pmd_alloc_one(struct mm_struct *mm, unsigned long address)
1975 {
1976 BUG();
1977 return NULL;
1978 }
1979
1980 static void sun4c_free_pmd_fast(pmd_t * pmd) { }
1981
1982 static void sun4c_check_pgt_cache(int low, int high)
1983 {
1984 if (pgtable_cache_size > high) {
1985 do {
1986 if (pgd_quicklist)
1987 sun4c_free_pgd_slow(sun4c_get_pgd_fast());
1988 if (pte_quicklist)
1989 sun4c_free_pte_slow(sun4c_pte_alloc_one_fast(NULL, 0));
1990 } while (pgtable_cache_size > low);
1991 }
1992 }
1993
1994 /* An experiment, turn off by default for now... -DaveM */
1995 #define SUN4C_PRELOAD_PSEG
1996
1997 void sun4c_update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t pte)
1998 {
1999 unsigned long flags;
2000 int pseg;
2001
2002 if (vma->vm_mm->context == NO_CONTEXT)
2003 return;
2004
2005 local_irq_save(flags);
2006 address &= PAGE_MASK;
2007 if ((pseg = sun4c_get_segmap(address)) == invalid_segment) {
2008 struct sun4c_mmu_entry *entry = sun4c_user_strategy();
2009 struct mm_struct *mm = vma->vm_mm;
2010 unsigned long start, end;
2011
2012 entry->vaddr = start = (address & SUN4C_REAL_PGDIR_MASK);
2013 entry->ctx = mm->context;
2014 add_ring_ordered(sun4c_context_ring + mm->context, entry);
2015 sun4c_put_segmap(entry->vaddr, entry->pseg);
2016 end = start + SUN4C_REAL_PGDIR_SIZE;
2017 while (start < end) {
2018 #ifdef SUN4C_PRELOAD_PSEG
2019 pgd_t *pgdp = sun4c_pgd_offset(mm, start);
2020 pte_t *ptep;
2021
2022 if (!pgdp)
2023 goto no_mapping;
2024 ptep = sun4c_pte_offset_kernel((pmd_t *) pgdp, start);
2025 if (!ptep || !(pte_val(*ptep) & _SUN4C_PAGE_PRESENT))
2026 goto no_mapping;
2027 sun4c_put_pte(start, pte_val(*ptep));
2028 goto next;
2029
2030 no_mapping:
2031 #endif
2032 sun4c_put_pte(start, 0);
2033 #ifdef SUN4C_PRELOAD_PSEG
2034 next:
2035 #endif
2036 start += PAGE_SIZE;
2037 }
2038 #ifndef SUN4C_PRELOAD_PSEG
2039 sun4c_put_pte(address, pte_val(pte));
2040 #endif
2041 local_irq_restore(flags);
2042 return;
2043 } else {
2044 struct sun4c_mmu_entry *entry = &mmu_entry_pool[pseg];
2045
2046 remove_lru(entry);
2047 add_lru(entry);
2048 }
2049
2050 sun4c_put_pte(address, pte_val(pte));
2051 local_irq_restore(flags);
2052 }
2053
2054 extern void sparc_context_init(int);
2055 extern unsigned long end;
2056 extern unsigned long bootmem_init(unsigned long *pages_avail);
2057 extern unsigned long last_valid_pfn;
2058
2059 void __init sun4c_paging_init(void)
2060 {
2061 int i, cnt;
2062 unsigned long kernel_end, vaddr;
2063 extern struct resource sparc_iomap;
2064 unsigned long end_pfn, pages_avail;
2065
2066 kernel_end = (unsigned long) &end;
2067 kernel_end = SUN4C_REAL_PGDIR_ALIGN(kernel_end);
2068
2069 pages_avail = 0;
2070 last_valid_pfn = bootmem_init(&pages_avail);
2071 end_pfn = last_valid_pfn;
2072
2073 sun4c_probe_mmu();
2074 invalid_segment = (num_segmaps - 1);
2075 sun4c_init_mmu_entry_pool();
2076 sun4c_init_rings();
2077 sun4c_init_map_kernelprom(kernel_end);
2078 sun4c_init_clean_mmu(kernel_end);
2079 sun4c_init_fill_kernel_ring(SUN4C_KERNEL_BUCKETS);
2080 sun4c_init_lock_area(sparc_iomap.start, IOBASE_END);
2081 sun4c_init_lock_area(DVMA_VADDR, DVMA_END);
2082 sun4c_init_lock_areas();
2083 sun4c_init_fill_user_ring();
2084
2085 sun4c_set_context(0);
2086 memset(swapper_pg_dir, 0, PAGE_SIZE);
2087 memset(pg0, 0, PAGE_SIZE);
2088 memset(pg1, 0, PAGE_SIZE);
2089 memset(pg2, 0, PAGE_SIZE);
2090 memset(pg3, 0, PAGE_SIZE);
2091
2092 /* Save work later. */
2093 vaddr = VMALLOC_START;
2094 swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg0);
2095 vaddr += SUN4C_PGDIR_SIZE;
2096 swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg1);
2097 vaddr += SUN4C_PGDIR_SIZE;
2098 swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg2);
2099 vaddr += SUN4C_PGDIR_SIZE;
2100 swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg3);
2101 sun4c_init_ss2_cache_bug();
2102 sparc_context_init(num_contexts);
2103
2104 {
2105 unsigned long zones_size[MAX_NR_ZONES];
2106 unsigned long zholes_size[MAX_NR_ZONES];
2107 unsigned long npages;
2108 int znum;
2109
2110 for (znum = 0; znum < MAX_NR_ZONES; znum++)
2111 zones_size[znum] = zholes_size[znum] = 0;
2112
2113 npages = max_low_pfn - pfn_base;
2114
2115 zones_size[ZONE_DMA] = npages;
2116 zholes_size[ZONE_DMA] = npages - pages_avail;
2117
2118 npages = highend_pfn - max_low_pfn;
2119 zones_size[ZONE_HIGHMEM] = npages;
2120 zholes_size[ZONE_HIGHMEM] = npages - calc_highpages();
2121
2122 free_area_init_node(0, &contig_page_data, zones_size,
2123 pfn_base, zholes_size);
2124 }
2125
2126 cnt = 0;
2127 for (i = 0; i < num_segmaps; i++)
2128 if (mmu_entry_pool[i].locked)
2129 cnt++;
2130
2131 max_user_taken_entries = num_segmaps - cnt - 40 - 1;
2132
2133 printk("SUN4C: %d mmu entries for the kernel\n", cnt);
2134 }
2135
2136 static pgprot_t sun4c_pgprot_noncached(pgprot_t prot)
2137 {
2138 prot |= __pgprot(_SUN4C_PAGE_IO | _SUN4C_PAGE_NOCACHE);
2139
2140 return prot;
2141 }
2142
2143 /* Load up routines and constants for sun4c mmu */
2144 void __init ld_mmu_sun4c(void)
2145 {
2146 extern void ___xchg32_sun4c(void);
2147
2148 printk("Loading sun4c MMU routines\n");
2149
2150 /* First the constants */
2151 BTFIXUPSET_SIMM13(pgdir_shift, SUN4C_PGDIR_SHIFT);
2152 BTFIXUPSET_SETHI(pgdir_size, SUN4C_PGDIR_SIZE);
2153 BTFIXUPSET_SETHI(pgdir_mask, SUN4C_PGDIR_MASK);
2154
2155 BTFIXUPSET_SIMM13(ptrs_per_pmd, SUN4C_PTRS_PER_PMD);
2156 BTFIXUPSET_SIMM13(ptrs_per_pgd, SUN4C_PTRS_PER_PGD);
2157 BTFIXUPSET_SIMM13(user_ptrs_per_pgd, KERNBASE / SUN4C_PGDIR_SIZE);
2158
2159 BTFIXUPSET_INT(page_none, pgprot_val(SUN4C_PAGE_NONE));
2160 PAGE_SHARED = pgprot_val(SUN4C_PAGE_SHARED);
2161 BTFIXUPSET_INT(page_copy, pgprot_val(SUN4C_PAGE_COPY));
2162 BTFIXUPSET_INT(page_readonly, pgprot_val(SUN4C_PAGE_READONLY));
2163 BTFIXUPSET_INT(page_kernel, pgprot_val(SUN4C_PAGE_KERNEL));
2164 page_kernel = pgprot_val(SUN4C_PAGE_KERNEL);
2165
2166 /* Functions */
2167 BTFIXUPSET_CALL(pgprot_noncached, sun4c_pgprot_noncached, BTFIXUPCALL_NORM);
2168 BTFIXUPSET_CALL(___xchg32, ___xchg32_sun4c, BTFIXUPCALL_NORM);
2169 BTFIXUPSET_CALL(do_check_pgt_cache, sun4c_check_pgt_cache, BTFIXUPCALL_NORM);
2170
2171 BTFIXUPSET_CALL(flush_cache_all, sun4c_flush_cache_all, BTFIXUPCALL_NORM);
2172
2173 if (sun4c_vacinfo.do_hwflushes) {
2174 BTFIXUPSET_CALL(sun4c_flush_page, sun4c_flush_page_hw, BTFIXUPCALL_NORM);
2175 BTFIXUPSET_CALL(sun4c_flush_segment, sun4c_flush_segment_hw, BTFIXUPCALL_NORM);
2176 BTFIXUPSET_CALL(sun4c_flush_context, sun4c_flush_context_hw, BTFIXUPCALL_NORM);
2177 } else {
2178 BTFIXUPSET_CALL(sun4c_flush_page, sun4c_flush_page_sw, BTFIXUPCALL_NORM);
2179 BTFIXUPSET_CALL(sun4c_flush_segment, sun4c_flush_segment_sw, BTFIXUPCALL_NORM);
2180 BTFIXUPSET_CALL(sun4c_flush_context, sun4c_flush_context_sw, BTFIXUPCALL_NORM);
2181 }
2182
2183 BTFIXUPSET_CALL(flush_tlb_mm, sun4c_flush_tlb_mm, BTFIXUPCALL_NORM);
2184 BTFIXUPSET_CALL(flush_cache_mm, sun4c_flush_cache_mm, BTFIXUPCALL_NORM);
2185 BTFIXUPSET_CALL(destroy_context, sun4c_destroy_context, BTFIXUPCALL_NORM);
2186 BTFIXUPSET_CALL(switch_mm, sun4c_switch_mm, BTFIXUPCALL_NORM);
2187 BTFIXUPSET_CALL(flush_cache_page, sun4c_flush_cache_page, BTFIXUPCALL_NORM);
2188 BTFIXUPSET_CALL(flush_tlb_page, sun4c_flush_tlb_page, BTFIXUPCALL_NORM);
2189 BTFIXUPSET_CALL(flush_tlb_range, sun4c_flush_tlb_range, BTFIXUPCALL_NORM);
2190 BTFIXUPSET_CALL(flush_cache_range, sun4c_flush_cache_range, BTFIXUPCALL_NORM);
2191 BTFIXUPSET_CALL(__flush_page_to_ram, sun4c_flush_page_to_ram, BTFIXUPCALL_NORM);
2192 BTFIXUPSET_CALL(flush_tlb_all, sun4c_flush_tlb_all, BTFIXUPCALL_NORM);
2193
2194 BTFIXUPSET_CALL(flush_sig_insns, sun4c_flush_sig_insns, BTFIXUPCALL_NOP);
2195
2196 BTFIXUPSET_CALL(set_pte, sun4c_set_pte, BTFIXUPCALL_STO1O0);
2197
2198 /* The 2.4.18 code does not set this on sun4c, how does it work? XXX */
2199 /* BTFIXUPSET_SETHI(none_mask, 0x00000000); */ /* Defaults to zero? */
2200
2201 BTFIXUPSET_CALL(pte_pfn, sun4c_pte_pfn, BTFIXUPCALL_NORM);
2202 #if 0 /* PAGE_SHIFT <= 12 */ /* Eek. Investigate. XXX */
2203 BTFIXUPSET_CALL(pmd_page, sun4c_pmd_page, BTFIXUPCALL_ANDNINT(PAGE_SIZE - 1));
2204 #else
2205 BTFIXUPSET_CALL(pmd_page, sun4c_pmd_page, BTFIXUPCALL_NORM);
2206 #endif
2207 BTFIXUPSET_CALL(pmd_set, sun4c_pmd_set, BTFIXUPCALL_NORM);
2208 BTFIXUPSET_CALL(pmd_populate, sun4c_pmd_populate, BTFIXUPCALL_NORM);
2209
2210 BTFIXUPSET_CALL(pte_present, sun4c_pte_present, BTFIXUPCALL_NORM);
2211 BTFIXUPSET_CALL(pte_clear, sun4c_pte_clear, BTFIXUPCALL_STG0O0);
2212
2213 BTFIXUPSET_CALL(pmd_bad, sun4c_pmd_bad, BTFIXUPCALL_NORM);
2214 BTFIXUPSET_CALL(pmd_present, sun4c_pmd_present, BTFIXUPCALL_NORM);
2215 BTFIXUPSET_CALL(pmd_clear, sun4c_pmd_clear, BTFIXUPCALL_STG0O0);
2216
2217 BTFIXUPSET_CALL(pgd_none, sun4c_pgd_none, BTFIXUPCALL_RETINT(0));
2218 BTFIXUPSET_CALL(pgd_bad, sun4c_pgd_bad, BTFIXUPCALL_RETINT(0));
2219 BTFIXUPSET_CALL(pgd_present, sun4c_pgd_present, BTFIXUPCALL_RETINT(1));
2220 BTFIXUPSET_CALL(pgd_clear, sun4c_pgd_clear, BTFIXUPCALL_NOP);
2221
2222 BTFIXUPSET_CALL(mk_pte, sun4c_mk_pte, BTFIXUPCALL_NORM);
2223 BTFIXUPSET_CALL(mk_pte_phys, sun4c_mk_pte_phys, BTFIXUPCALL_NORM);
2224 BTFIXUPSET_CALL(mk_pte_io, sun4c_mk_pte_io, BTFIXUPCALL_NORM);
2225
2226 BTFIXUPSET_INT(pte_modify_mask, _SUN4C_PAGE_CHG_MASK);
2227 BTFIXUPSET_CALL(pmd_offset, sun4c_pmd_offset, BTFIXUPCALL_NORM);
2228 BTFIXUPSET_CALL(pte_offset_kernel, sun4c_pte_offset_kernel, BTFIXUPCALL_NORM);
2229 BTFIXUPSET_CALL(free_pte_fast, sun4c_free_pte_fast, BTFIXUPCALL_NORM);
2230 BTFIXUPSET_CALL(pte_free, sun4c_pte_free, BTFIXUPCALL_NORM);
2231 BTFIXUPSET_CALL(pte_alloc_one_kernel, sun4c_pte_alloc_one_kernel, BTFIXUPCALL_NORM);
2232 BTFIXUPSET_CALL(pte_alloc_one, sun4c_pte_alloc_one, BTFIXUPCALL_NORM);
2233 BTFIXUPSET_CALL(free_pmd_fast, sun4c_free_pmd_fast, BTFIXUPCALL_NOP);
2234 BTFIXUPSET_CALL(pmd_alloc_one, sun4c_pmd_alloc_one, BTFIXUPCALL_RETO0);
2235 BTFIXUPSET_CALL(free_pgd_fast, sun4c_free_pgd_fast, BTFIXUPCALL_NORM);
2236 BTFIXUPSET_CALL(get_pgd_fast, sun4c_get_pgd_fast, BTFIXUPCALL_NORM);
2237
2238 BTFIXUPSET_HALF(pte_writei, _SUN4C_PAGE_WRITE);
2239 BTFIXUPSET_HALF(pte_dirtyi, _SUN4C_PAGE_MODIFIED);
2240 BTFIXUPSET_HALF(pte_youngi, _SUN4C_PAGE_ACCESSED);
2241 BTFIXUPSET_HALF(pte_filei, _SUN4C_PAGE_FILE);
2242 BTFIXUPSET_HALF(pte_wrprotecti, _SUN4C_PAGE_WRITE|_SUN4C_PAGE_SILENT_WRITE);
2243 BTFIXUPSET_HALF(pte_mkcleani, _SUN4C_PAGE_MODIFIED|_SUN4C_PAGE_SILENT_WRITE);
2244 BTFIXUPSET_HALF(pte_mkoldi, _SUN4C_PAGE_ACCESSED|_SUN4C_PAGE_SILENT_READ);
2245 BTFIXUPSET_CALL(pte_mkwrite, sun4c_pte_mkwrite, BTFIXUPCALL_NORM);
2246 BTFIXUPSET_CALL(pte_mkdirty, sun4c_pte_mkdirty, BTFIXUPCALL_NORM);
2247 BTFIXUPSET_CALL(pte_mkyoung, sun4c_pte_mkyoung, BTFIXUPCALL_NORM);
2248 BTFIXUPSET_CALL(update_mmu_cache, sun4c_update_mmu_cache, BTFIXUPCALL_NORM);
2249
2250 BTFIXUPSET_CALL(pte_to_pgoff, sun4c_pte_to_pgoff, BTFIXUPCALL_NORM);
2251 BTFIXUPSET_CALL(pgoff_to_pte, sun4c_pgoff_to_pte, BTFIXUPCALL_NORM);
2252
2253 BTFIXUPSET_CALL(mmu_lockarea, sun4c_lockarea, BTFIXUPCALL_NORM);
2254 BTFIXUPSET_CALL(mmu_unlockarea, sun4c_unlockarea, BTFIXUPCALL_NORM);
2255
2256 BTFIXUPSET_CALL(mmu_get_scsi_one, sun4c_get_scsi_one, BTFIXUPCALL_NORM);
2257 BTFIXUPSET_CALL(mmu_get_scsi_sgl, sun4c_get_scsi_sgl, BTFIXUPCALL_NORM);
2258 BTFIXUPSET_CALL(mmu_release_scsi_one, sun4c_release_scsi_one, BTFIXUPCALL_NORM);
2259 BTFIXUPSET_CALL(mmu_release_scsi_sgl, sun4c_release_scsi_sgl, BTFIXUPCALL_NORM);
2260
2261 BTFIXUPSET_CALL(mmu_map_dma_area, sun4c_map_dma_area, BTFIXUPCALL_NORM);
2262 BTFIXUPSET_CALL(mmu_unmap_dma_area, sun4c_unmap_dma_area, BTFIXUPCALL_NORM);
2263 BTFIXUPSET_CALL(mmu_translate_dvma, sun4c_translate_dvma, BTFIXUPCALL_NORM);
2264
2265 BTFIXUPSET_CALL(sparc_mapiorange, sun4c_mapiorange, BTFIXUPCALL_NORM);
2266 BTFIXUPSET_CALL(sparc_unmapiorange, sun4c_unmapiorange, BTFIXUPCALL_NORM);
2267
2268 BTFIXUPSET_CALL(__swp_type, sun4c_swp_type, BTFIXUPCALL_NORM);
2269 BTFIXUPSET_CALL(__swp_offset, sun4c_swp_offset, BTFIXUPCALL_NORM);
2270 BTFIXUPSET_CALL(__swp_entry, sun4c_swp_entry, BTFIXUPCALL_NORM);
2271
2272 BTFIXUPSET_CALL(alloc_thread_info, sun4c_alloc_thread_info, BTFIXUPCALL_NORM);
2273 BTFIXUPSET_CALL(free_thread_info, sun4c_free_thread_info, BTFIXUPCALL_NORM);
2274
2275 BTFIXUPSET_CALL(mmu_info, sun4c_mmu_info, BTFIXUPCALL_NORM);
2276
2277 /* These should _never_ get called with two level tables. */
2278 BTFIXUPSET_CALL(pgd_set, sun4c_pgd_set, BTFIXUPCALL_NOP);
2279 BTFIXUPSET_CALL(pgd_page_vaddr, sun4c_pgd_page, BTFIXUPCALL_RETO0);
2280 }
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