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Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6
[deliverable/linux.git] / arch / sparc / mm / sun4c.c
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1da177e4
LT		 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
1da177e4
LT		 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
52extern int num_segmaps, num_contexts;
53
54extern 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. */
69struct sun4c_vac_props sun4c_vacinfo;
70unsigned long sun4c_kernel_faults;
71
72/* Invalidate every sun4c cache line tag. */
73static 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
90static 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. */
104static 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. */
120BTFIXUPDEF_CALL(void, sun4c_flush_page, unsigned long)
121BTFIXUPDEF_CALL(void, sun4c_flush_segment, unsigned long)
122BTFIXUPDEF_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. */
129static 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. */
138static 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. */
168static 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. */
202static 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 */
243void 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. */
255static 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
265static 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();
1da177e4
LT		 271 for (ctx = 0; ctx < num_contexts; ctx++) {
272 sun4c_set_context(ctx);
273 for (vaddr = 0; vaddr < 0x20000000; vaddr += SUN4C_REAL_PGDIR_SIZE)
274 sun4c_put_segmap(vaddr, invalid_segment);
275 for (vaddr = 0xe0000000; vaddr < KERNBASE; vaddr += SUN4C_REAL_PGDIR_SIZE)
276 sun4c_put_segmap(vaddr, invalid_segment);
277 for (vaddr = kernel_end; vaddr < KADB_DEBUGGER_BEGVM; vaddr += SUN4C_REAL_PGDIR_SIZE)
278 sun4c_put_segmap(vaddr, invalid_segment);
279 for (vaddr = LINUX_OPPROM_ENDVM; vaddr; vaddr += SUN4C_REAL_PGDIR_SIZE)
280 sun4c_put_segmap(vaddr, invalid_segment);
281 }
282 sun4c_set_context(savectx);
283}
284
285void __init sun4c_probe_vac(void)
286{
287 sun4c_disable_vac();
288
289 if (ARCH_SUN4) {
290 switch (idprom->id_machtype) {
291
292 case (SM_SUN4|SM_4_110):
293 sun4c_vacinfo.type = VAC_NONE;
294 sun4c_vacinfo.num_bytes = 0;
295 sun4c_vacinfo.linesize = 0;
296 sun4c_vacinfo.do_hwflushes = 0;
297 prom_printf("No VAC. Get some bucks and buy a real computer.");
298 prom_halt();
299 break;
300
301 case (SM_SUN4|SM_4_260):
302 sun4c_vacinfo.type = VAC_WRITE_BACK;
303 sun4c_vacinfo.num_bytes = 128 * 1024;
304 sun4c_vacinfo.linesize = 16;
305 sun4c_vacinfo.do_hwflushes = 0;
306 break;
307
308 case (SM_SUN4|SM_4_330):
309 sun4c_vacinfo.type = VAC_WRITE_THROUGH;
310 sun4c_vacinfo.num_bytes = 128 * 1024;
311 sun4c_vacinfo.linesize = 16;
312 sun4c_vacinfo.do_hwflushes = 0;
313 break;
314
315 case (SM_SUN4|SM_4_470):
316 sun4c_vacinfo.type = VAC_WRITE_BACK;
317 sun4c_vacinfo.num_bytes = 128 * 1024;
318 sun4c_vacinfo.linesize = 32;
319 sun4c_vacinfo.do_hwflushes = 0;
320 break;
321
322 default:
323 prom_printf("Cannot initialize VAC - weird sun4 model idprom->id_machtype = %d", idprom->id_machtype);
324 prom_halt();
325 };
326 } else {
327 sun4c_vacinfo.type = VAC_WRITE_THROUGH;
328
329 if ((idprom->id_machtype == (SM_SUN4C | SM_4C_SS1)) ||
330 (idprom->id_machtype == (SM_SUN4C | SM_4C_SS1PLUS))) {
331 /* PROM on SS1 lacks this info, to be super safe we
332 * hard code it here since this arch is cast in stone.
333 */
334 sun4c_vacinfo.num_bytes = 65536;
335 sun4c_vacinfo.linesize = 16;
336 } else {
337 sun4c_vacinfo.num_bytes =
338 prom_getintdefault(prom_root_node, "vac-size", 65536);
339 sun4c_vacinfo.linesize =
340 prom_getintdefault(prom_root_node, "vac-linesize", 16);
341 }
342 sun4c_vacinfo.do_hwflushes =
343 prom_getintdefault(prom_root_node, "vac-hwflush", 0);
344
345 if (sun4c_vacinfo.do_hwflushes == 0)
346 sun4c_vacinfo.do_hwflushes =
347 prom_getintdefault(prom_root_node, "vac_hwflush", 0);
348
349 if (sun4c_vacinfo.num_bytes != 65536) {
350 prom_printf("WEIRD Sun4C VAC cache size, "
351 "tell sparclinux@vger.kernel.org");
352 prom_halt();
353 }
354 }
355
356 sun4c_vacinfo.num_lines =
357 (sun4c_vacinfo.num_bytes / sun4c_vacinfo.linesize);
358 switch (sun4c_vacinfo.linesize) {
359 case 16:
360 sun4c_vacinfo.log2lsize = 4;
361 break;
362 case 32:
363 sun4c_vacinfo.log2lsize = 5;
364 break;
365 default:
366 prom_printf("probe_vac: Didn't expect vac-linesize of %d, halting\n",
367 sun4c_vacinfo.linesize);
368 prom_halt();
369 };
370
371 sun4c_flush_all();
372 sun4c_enable_vac();
373}
374
375/* Patch instructions for the low level kernel fault handler. */
376extern unsigned long invalid_segment_patch1, invalid_segment_patch1_ff;
377extern unsigned long invalid_segment_patch2, invalid_segment_patch2_ff;
378extern unsigned long invalid_segment_patch1_1ff, invalid_segment_patch2_1ff;
379extern unsigned long num_context_patch1, num_context_patch1_16;
380extern unsigned long num_context_patch2_16;
381extern unsigned long vac_linesize_patch, vac_linesize_patch_32;
382extern unsigned long vac_hwflush_patch1, vac_hwflush_patch1_on;
383extern unsigned long vac_hwflush_patch2, vac_hwflush_patch2_on;
384
385#define PATCH_INSN(src, dst) do { \
386 daddr = &(dst); \
387 iaddr = &(src); \
388 *daddr = *iaddr; \
389 } while (0)
390
391static void __init patch_kernel_fault_handler(void)
392{
393 unsigned long *iaddr, *daddr;
394
395 switch (num_segmaps) {
396 case 128:
397 /* Default, nothing to do. */
398 break;
399 case 256:
400 PATCH_INSN(invalid_segment_patch1_ff,
401 invalid_segment_patch1);
402 PATCH_INSN(invalid_segment_patch2_ff,
403 invalid_segment_patch2);
404 break;
405 case 512:
406 PATCH_INSN(invalid_segment_patch1_1ff,
407 invalid_segment_patch1);
408 PATCH_INSN(invalid_segment_patch2_1ff,
409 invalid_segment_patch2);
410 break;
411 default:
412 prom_printf("Unhandled number of segmaps: %d\n",
413 num_segmaps);
414 prom_halt();
415 };
416 switch (num_contexts) {
417 case 8:
418 /* Default, nothing to do. */
419 break;
420 case 16:
421 PATCH_INSN(num_context_patch1_16,
422 num_context_patch1);
423 break;
424 default:
425 prom_printf("Unhandled number of contexts: %d\n",
426 num_contexts);
427 prom_halt();
428 };
429
430 if (sun4c_vacinfo.do_hwflushes != 0) {
431 PATCH_INSN(vac_hwflush_patch1_on, vac_hwflush_patch1);
432 PATCH_INSN(vac_hwflush_patch2_on, vac_hwflush_patch2);
433 } else {
434 switch (sun4c_vacinfo.linesize) {
435 case 16:
436 /* Default, nothing to do. */
437 break;
438 case 32:
439 PATCH_INSN(vac_linesize_patch_32, vac_linesize_patch);
440 break;
441 default:
442 prom_printf("Impossible VAC linesize %d, halting...\n",
443 sun4c_vacinfo.linesize);
444 prom_halt();
445 };
446 }
447}
448
449static void __init sun4c_probe_mmu(void)
450{
451 if (ARCH_SUN4) {
452 switch (idprom->id_machtype) {
453 case (SM_SUN4|SM_4_110):
454 prom_printf("No support for 4100 yet\n");
455 prom_halt();
456 num_segmaps = 256;
457 num_contexts = 8;
458 break;
459
460 case (SM_SUN4|SM_4_260):
461 /* should be 512 segmaps. when it get fixed */
462 num_segmaps = 256;
463 num_contexts = 16;
464 break;
465
466 case (SM_SUN4|SM_4_330):
467 num_segmaps = 256;
468 num_contexts = 16;
469 break;
470
471 case (SM_SUN4|SM_4_470):
472 /* should be 1024 segmaps. when it get fixed */
473 num_segmaps = 256;
474 num_contexts = 64;
475 break;
476 default:
477 prom_printf("Invalid SUN4 model\n");
478 prom_halt();
479 };
480 } else {
481 if ((idprom->id_machtype == (SM_SUN4C | SM_4C_SS1)) ||
482 (idprom->id_machtype == (SM_SUN4C | SM_4C_SS1PLUS))) {
483 /* Hardcode these just to be safe, PROM on SS1 does
484 * not have this info available in the root node.
485 */
486 num_segmaps = 128;
487 num_contexts = 8;
488 } else {
489 num_segmaps =
490 prom_getintdefault(prom_root_node, "mmu-npmg", 128);
491 num_contexts =
492 prom_getintdefault(prom_root_node, "mmu-nctx", 0x8);
493 }
494 }
495 patch_kernel_fault_handler();
496}
497
a3297296 498volatile unsigned long __iomem *sun4c_memerr_reg = NULL;
1da177e4
LT		 499
500void __init sun4c_probe_memerr_reg(void)
501{
502 int node;
503 struct linux_prom_registers regs[1];
504
505 if (ARCH_SUN4) {
506 sun4c_memerr_reg = ioremap(sun4_memreg_physaddr, PAGE_SIZE);
507 } else {
508 node = prom_getchild(prom_root_node);
509 node = prom_searchsiblings(prom_root_node, "memory-error");
510 if (!node)
511 return;
512 if (prom_getproperty(node, "reg", (char *)regs, sizeof(regs)) <= 0)
513 return;
514 /* hmm I think regs[0].which_io is zero here anyways */
515 sun4c_memerr_reg = ioremap(regs[0].phys_addr, regs[0].reg_size);
516 }
517}
518
519static inline void sun4c_init_ss2_cache_bug(void)
520{
521 extern unsigned long start;
522
523 if ((idprom->id_machtype == (SM_SUN4C | SM_4C_SS2)) ||
524 (idprom->id_machtype == (SM_SUN4C | SM_4C_IPX)) ||
525 (idprom->id_machtype == (SM_SUN4 | SM_4_330)) ||
526 (idprom->id_machtype == (SM_SUN4C | SM_4C_ELC))) {
527 /* Whee.. */
528 printk("SS2 cache bug detected, uncaching trap table page\n");
529 sun4c_flush_page((unsigned int) &start);
530 sun4c_put_pte(((unsigned long) &start),
531 (sun4c_get_pte((unsigned long) &start) | _SUN4C_PAGE_NOCACHE));
532 }
533}
534
535/* Addr is always aligned on a page boundary for us already. */
536static int sun4c_map_dma_area(dma_addr_t *pba, unsigned long va,
537 unsigned long addr, int len)
538{
539 unsigned long page, end;
540
541 *pba = addr;
542
543 end = PAGE_ALIGN((addr + len));
544 while (addr < end) {
545 page = va;
546 sun4c_flush_page(page);
547 page -= PAGE_OFFSET;
548 page >>= PAGE_SHIFT;
549 page |= (_SUN4C_PAGE_VALID | _SUN4C_PAGE_DIRTY |
550 _SUN4C_PAGE_NOCACHE | _SUN4C_PAGE_PRIV);
551 sun4c_put_pte(addr, page);
552 addr += PAGE_SIZE;
553 va += PAGE_SIZE;
554 }
555
556 return 0;
557}
558
559static struct page *sun4c_translate_dvma(unsigned long busa)
560{
561 /* Fortunately for us, bus_addr == uncached_virt in sun4c. */
562 unsigned long pte = sun4c_get_pte(busa);
563 return pfn_to_page(pte & SUN4C_PFN_MASK);
564}
565
566static void sun4c_unmap_dma_area(unsigned long busa, int len)
567{
568 /* Fortunately for us, bus_addr == uncached_virt in sun4c. */
569 /* XXX Implement this */
570}
571
572/* TLB management. */
573
574/* Don't change this struct without changing entry.S. This is used
575 * in the in-window kernel fault handler, and you don't want to mess
576 * with that. (See sun4c_fault in entry.S).
577 */
578struct sun4c_mmu_entry {
579 struct sun4c_mmu_entry *next;
580 struct sun4c_mmu_entry *prev;
581 unsigned long vaddr;
582 unsigned char pseg;
583 unsigned char locked;
584
585 /* For user mappings only, and completely hidden from kernel
586 * TLB miss code.
587 */
588 unsigned char ctx;
589 struct sun4c_mmu_entry *lru_next;
590 struct sun4c_mmu_entry *lru_prev;
591};
592
593static struct sun4c_mmu_entry mmu_entry_pool[SUN4C_MAX_SEGMAPS];
594
595static void __init sun4c_init_mmu_entry_pool(void)
596{
597 int i;
598
599 for (i=0; i < SUN4C_MAX_SEGMAPS; i++) {
600 mmu_entry_pool[i].pseg = i;
601 mmu_entry_pool[i].next = NULL;
602 mmu_entry_pool[i].prev = NULL;
603 mmu_entry_pool[i].vaddr = 0;
604 mmu_entry_pool[i].locked = 0;
605 mmu_entry_pool[i].ctx = 0;
606 mmu_entry_pool[i].lru_next = NULL;
607 mmu_entry_pool[i].lru_prev = NULL;
608 }
609 mmu_entry_pool[invalid_segment].locked = 1;
610}
611
612static inline void fix_permissions(unsigned long vaddr, unsigned long bits_on,
613 unsigned long bits_off)
614{
615 unsigned long start, end;
616
617 end = vaddr + SUN4C_REAL_PGDIR_SIZE;
618 for (start = vaddr; start < end; start += PAGE_SIZE)
619 if (sun4c_get_pte(start) & _SUN4C_PAGE_VALID)
620 sun4c_put_pte(start, (sun4c_get_pte(start) | bits_on) &
621 ~bits_off);
622}
623
624static inline void sun4c_init_map_kernelprom(unsigned long kernel_end)
625{
626 unsigned long vaddr;
627 unsigned char pseg, ctx;
628#ifdef CONFIG_SUN4
629 /* sun4/110 and 260 have no kadb. */
630 if ((idprom->id_machtype != (SM_SUN4 | SM_4_260)) &&
631 (idprom->id_machtype != (SM_SUN4 | SM_4_110))) {
632#endif
633 for (vaddr = KADB_DEBUGGER_BEGVM;
634 vaddr < LINUX_OPPROM_ENDVM;
635 vaddr += SUN4C_REAL_PGDIR_SIZE) {
636 pseg = sun4c_get_segmap(vaddr);
637 if (pseg != invalid_segment) {
638 mmu_entry_pool[pseg].locked = 1;
639 for (ctx = 0; ctx < num_contexts; ctx++)
640 prom_putsegment(ctx, vaddr, pseg);
641 fix_permissions(vaddr, _SUN4C_PAGE_PRIV, 0);
642 }
643 }
644#ifdef CONFIG_SUN4
645 }
646#endif
647 for (vaddr = KERNBASE; vaddr < kernel_end; vaddr += SUN4C_REAL_PGDIR_SIZE) {
648 pseg = sun4c_get_segmap(vaddr);
649 mmu_entry_pool[pseg].locked = 1;
650 for (ctx = 0; ctx < num_contexts; ctx++)
651 prom_putsegment(ctx, vaddr, pseg);
652 fix_permissions(vaddr, _SUN4C_PAGE_PRIV, _SUN4C_PAGE_NOCACHE);
653 }
654}
655
656static void __init sun4c_init_lock_area(unsigned long start, unsigned long end)
657{
658 int i, ctx;
659
660 while (start < end) {
661 for (i = 0; i < invalid_segment; i++)
662 if (!mmu_entry_pool[i].locked)
663 break;
664 mmu_entry_pool[i].locked = 1;
665 sun4c_init_clean_segmap(i);
666 for (ctx = 0; ctx < num_contexts; ctx++)
667 prom_putsegment(ctx, start, mmu_entry_pool[i].pseg);
668 start += SUN4C_REAL_PGDIR_SIZE;
669 }
670}
671
672/* Don't change this struct without changing entry.S. This is used
673 * in the in-window kernel fault handler, and you don't want to mess
674 * with that. (See sun4c_fault in entry.S).
675 */
676struct sun4c_mmu_ring {
677 struct sun4c_mmu_entry ringhd;
678 int num_entries;
679};
680
681static struct sun4c_mmu_ring sun4c_context_ring[SUN4C_MAX_CONTEXTS]; /* used user entries */
682static struct sun4c_mmu_ring sun4c_ufree_ring; /* free user entries */
683static struct sun4c_mmu_ring sun4c_ulru_ring; /* LRU user entries */
684struct sun4c_mmu_ring sun4c_kernel_ring; /* used kernel entries */
685struct sun4c_mmu_ring sun4c_kfree_ring; /* free kernel entries */
686
687static inline void sun4c_init_rings(void)
688{
689 int i;
690
691 for (i = 0; i < SUN4C_MAX_CONTEXTS; i++) {
692 sun4c_context_ring[i].ringhd.next =
693 sun4c_context_ring[i].ringhd.prev =
694 &sun4c_context_ring[i].ringhd;
695 sun4c_context_ring[i].num_entries = 0;
696 }
697 sun4c_ufree_ring.ringhd.next = sun4c_ufree_ring.ringhd.prev =
698 &sun4c_ufree_ring.ringhd;
699 sun4c_ufree_ring.num_entries = 0;
700 sun4c_ulru_ring.ringhd.lru_next = sun4c_ulru_ring.ringhd.lru_prev =
701 &sun4c_ulru_ring.ringhd;
702 sun4c_ulru_ring.num_entries = 0;
703 sun4c_kernel_ring.ringhd.next = sun4c_kernel_ring.ringhd.prev =
704 &sun4c_kernel_ring.ringhd;
705 sun4c_kernel_ring.num_entries = 0;
706 sun4c_kfree_ring.ringhd.next = sun4c_kfree_ring.ringhd.prev =
707 &sun4c_kfree_ring.ringhd;
708 sun4c_kfree_ring.num_entries = 0;
709}
710
711static void add_ring(struct sun4c_mmu_ring *ring,
712 struct sun4c_mmu_entry *entry)
713{
714 struct sun4c_mmu_entry *head = &ring->ringhd;
715
716 entry->prev = head;
717 (entry->next = head->next)->prev = entry;
718 head->next = entry;
719 ring->num_entries++;
720}
721
722static __inline__ void add_lru(struct sun4c_mmu_entry *entry)
723{
724 struct sun4c_mmu_ring *ring = &sun4c_ulru_ring;
725 struct sun4c_mmu_entry *head = &ring->ringhd;
726
727 entry->lru_next = head;
728 (entry->lru_prev = head->lru_prev)->lru_next = entry;
729 head->lru_prev = entry;
730}
731
732static void add_ring_ordered(struct sun4c_mmu_ring *ring,
733 struct sun4c_mmu_entry *entry)
734{
735 struct sun4c_mmu_entry *head = &ring->ringhd;
736 unsigned long addr = entry->vaddr;
737
738 while ((head->next != &ring->ringhd) && (head->next->vaddr < addr))
739 head = head->next;
740
741 entry->prev = head;
742 (entry->next = head->next)->prev = entry;
743 head->next = entry;
744 ring->num_entries++;
745
746 add_lru(entry);
747}
748
749static __inline__ void remove_ring(struct sun4c_mmu_ring *ring,
750 struct sun4c_mmu_entry *entry)
751{
752 struct sun4c_mmu_entry *next = entry->next;
753
754 (next->prev = entry->prev)->next = next;
755 ring->num_entries--;
756}
757
758static void remove_lru(struct sun4c_mmu_entry *entry)
759{
760 struct sun4c_mmu_entry *next = entry->lru_next;
761
762 (next->lru_prev = entry->lru_prev)->lru_next = next;
763}
764
765static void free_user_entry(int ctx, struct sun4c_mmu_entry *entry)
766{
767 remove_ring(sun4c_context_ring+ctx, entry);
768 remove_lru(entry);
769 add_ring(&sun4c_ufree_ring, entry);
770}
771
772static void free_kernel_entry(struct sun4c_mmu_entry *entry,
773 struct sun4c_mmu_ring *ring)
774{
775 remove_ring(ring, entry);
776 add_ring(&sun4c_kfree_ring, entry);
777}
778
779static void __init sun4c_init_fill_kernel_ring(int howmany)
780{
781 int i;
782
783 while (howmany) {
784 for (i = 0; i < invalid_segment; i++)
785 if (!mmu_entry_pool[i].locked)
786 break;
787 mmu_entry_pool[i].locked = 1;
788 sun4c_init_clean_segmap(i);
789 add_ring(&sun4c_kfree_ring, &mmu_entry_pool[i]);
790 howmany--;
791 }
792}
793
794static void __init sun4c_init_fill_user_ring(void)
795{
796 int i;
797
798 for (i = 0; i < invalid_segment; i++) {
799 if (mmu_entry_pool[i].locked)
800 continue;
801 sun4c_init_clean_segmap(i);
802 add_ring(&sun4c_ufree_ring, &mmu_entry_pool[i]);
803 }
804}
805
806static void sun4c_kernel_unmap(struct sun4c_mmu_entry *kentry)
807{
808 int savectx, ctx;
809
810 savectx = sun4c_get_context();
811 for (ctx = 0; ctx < num_contexts; ctx++) {
812 sun4c_set_context(ctx);
813 sun4c_put_segmap(kentry->vaddr, invalid_segment);
814 }
815 sun4c_set_context(savectx);
816}
817
818static void sun4c_kernel_map(struct sun4c_mmu_entry *kentry)
819{
820 int savectx, ctx;
821
822 savectx = sun4c_get_context();
823 for (ctx = 0; ctx < num_contexts; ctx++) {
824 sun4c_set_context(ctx);
825 sun4c_put_segmap(kentry->vaddr, kentry->pseg);
826 }
827 sun4c_set_context(savectx);
828}
829
830#define sun4c_user_unmap(__entry) \
831 sun4c_put_segmap((__entry)->vaddr, invalid_segment)
832
833static void sun4c_demap_context(struct sun4c_mmu_ring *crp, unsigned char ctx)
834{
835 struct sun4c_mmu_entry *head = &crp->ringhd;
836 unsigned long flags;
837
838 local_irq_save(flags);
839 if (head->next != head) {
840 struct sun4c_mmu_entry *entry = head->next;
841 int savectx = sun4c_get_context();
842
843 flush_user_windows();
844 sun4c_set_context(ctx);
845 sun4c_flush_context();
846 do {
847 struct sun4c_mmu_entry *next = entry->next;
848
849 sun4c_user_unmap(entry);
850 free_user_entry(ctx, entry);
851
852 entry = next;
853 } while (entry != head);
854 sun4c_set_context(savectx);
855 }
856 local_irq_restore(flags);
857}
858
859static int sun4c_user_taken_entries; /* This is how much we have. */
860static int max_user_taken_entries; /* This limits us and prevents deadlock. */
861
862static struct sun4c_mmu_entry *sun4c_kernel_strategy(void)
863{
864 struct sun4c_mmu_entry *this_entry;
865
866 /* If some are free, return first one. */
867 if (sun4c_kfree_ring.num_entries) {
868 this_entry = sun4c_kfree_ring.ringhd.next;
869 return this_entry;
870 }
871
872 /* Else free one up. */
873 this_entry = sun4c_kernel_ring.ringhd.prev;
874 sun4c_flush_segment(this_entry->vaddr);
875 sun4c_kernel_unmap(this_entry);
876 free_kernel_entry(this_entry, &sun4c_kernel_ring);
877 this_entry = sun4c_kfree_ring.ringhd.next;
878
879 return this_entry;
880}
881
882/* Using this method to free up mmu entries eliminates a lot of
883 * potential races since we have a kernel that incurs tlb
884 * replacement faults. There may be performance penalties.
885 *
886 * NOTE: Must be called with interrupts disabled.
887 */
888static struct sun4c_mmu_entry *sun4c_user_strategy(void)
889{
890 struct sun4c_mmu_entry *entry;
891 unsigned char ctx;
892 int savectx;
893
894 /* If some are free, return first one. */
895 if (sun4c_ufree_ring.num_entries) {
896 entry = sun4c_ufree_ring.ringhd.next;
897 goto unlink_out;
898 }
899
900 if (sun4c_user_taken_entries) {
901 entry = sun4c_kernel_strategy();
902 sun4c_user_taken_entries--;
903 goto kunlink_out;
904 }
905
906 /* Grab from the beginning of the LRU list. */
907 entry = sun4c_ulru_ring.ringhd.lru_next;
908 ctx = entry->ctx;
909
910 savectx = sun4c_get_context();
911 flush_user_windows();
912 sun4c_set_context(ctx);
913 sun4c_flush_segment(entry->vaddr);
914 sun4c_user_unmap(entry);
915 remove_ring(sun4c_context_ring + ctx, entry);
916 remove_lru(entry);
917 sun4c_set_context(savectx);
918
919 return entry;
920
921unlink_out:
922 remove_ring(&sun4c_ufree_ring, entry);
923 return entry;
924kunlink_out:
925 remove_ring(&sun4c_kfree_ring, entry);
926 return entry;
927}
928
929/* NOTE: Must be called with interrupts disabled. */
930void sun4c_grow_kernel_ring(void)
931{
932 struct sun4c_mmu_entry *entry;
933
934 /* Prevent deadlock condition. */
935 if (sun4c_user_taken_entries >= max_user_taken_entries)
936 return;
937
938 if (sun4c_ufree_ring.num_entries) {
939 entry = sun4c_ufree_ring.ringhd.next;
940 remove_ring(&sun4c_ufree_ring, entry);
941 add_ring(&sun4c_kfree_ring, entry);
942 sun4c_user_taken_entries++;
943 }
944}
945
946/* 2 page buckets for task struct and kernel stack allocation.
947 *
948 * TASK_STACK_BEGIN
949 * bucket[0]
950 * bucket[1]
951 * [ ... ]
952 * bucket[NR_TASK_BUCKETS-1]
953 * TASK_STACK_BEGIN + (sizeof(struct task_bucket) * NR_TASK_BUCKETS)
954 *
955 * Each slot looks like:
956 *
957 * page 1 -- task struct + beginning of kernel stack
958 * page 2 -- rest of kernel stack
959 */
960
961union task_union *sun4c_bucket[NR_TASK_BUCKETS];
962
963static int sun4c_lowbucket_avail;
964
965#define BUCKET_EMPTY ((union task_union *) 0)
966#define BUCKET_SHIFT (PAGE_SHIFT + 1) /* log2(sizeof(struct task_bucket)) */
967#define BUCKET_SIZE (1 << BUCKET_SHIFT)
968#define BUCKET_NUM(addr) ((((addr) - SUN4C_LOCK_VADDR) >> BUCKET_SHIFT))
969#define BUCKET_ADDR(num) (((num) << BUCKET_SHIFT) + SUN4C_LOCK_VADDR)
970#define BUCKET_PTE(page) \
971 ((((page) - PAGE_OFFSET) >> PAGE_SHIFT) | pgprot_val(SUN4C_PAGE_KERNEL))
972#define BUCKET_PTE_PAGE(pte) \
973 (PAGE_OFFSET + (((pte) & SUN4C_PFN_MASK) << PAGE_SHIFT))
974
975static void get_locked_segment(unsigned long addr)
976{
977 struct sun4c_mmu_entry *stolen;
978 unsigned long flags;
979
980 local_irq_save(flags);
981 addr &= SUN4C_REAL_PGDIR_MASK;
982 stolen = sun4c_user_strategy();
983 max_user_taken_entries--;
984 stolen->vaddr = addr;
985 flush_user_windows();
986 sun4c_kernel_map(stolen);
987 local_irq_restore(flags);
988}
989
990static void free_locked_segment(unsigned long addr)
991{
992 struct sun4c_mmu_entry *entry;
993 unsigned long flags;
994 unsigned char pseg;
995
996 local_irq_save(flags);
997 addr &= SUN4C_REAL_PGDIR_MASK;
998 pseg = sun4c_get_segmap(addr);
999 entry = &mmu_entry_pool[pseg];
1000
1001 flush_user_windows();
1002 sun4c_flush_segment(addr);
1003 sun4c_kernel_unmap(entry);
1004 add_ring(&sun4c_ufree_ring, entry);
1005 max_user_taken_entries++;
1006 local_irq_restore(flags);
1007}
1008
1009static inline void garbage_collect(int entry)
1010{
1011 int start, end;
1012
1013 /* 32 buckets per segment... */
1014 entry &= ~31;
1015 start = entry;
1016 for (end = (start + 32); start < end; start++)
1017 if (sun4c_bucket[start] != BUCKET_EMPTY)
1018 return;
1019
1020 /* Entire segment empty, release it. */
1021 free_locked_segment(BUCKET_ADDR(entry));
1022}
1023
1024static struct thread_info *sun4c_alloc_thread_info(void)
1025{
1026 unsigned long addr, pages;
1027 int entry;
1028
1029 pages = __get_free_pages(GFP_KERNEL, THREAD_INFO_ORDER);
1030 if (!pages)
1031 return NULL;
1032
1033 for (entry = sun4c_lowbucket_avail; entry < NR_TASK_BUCKETS; entry++)
1034 if (sun4c_bucket[entry] == BUCKET_EMPTY)
1035 break;
1036 if (entry == NR_TASK_BUCKETS) {
1037 free_pages(pages, THREAD_INFO_ORDER);
1038 return NULL;
1039 }
1040 if (entry >= sun4c_lowbucket_avail)
1041 sun4c_lowbucket_avail = entry + 1;
1042
1043 addr = BUCKET_ADDR(entry);
1044 sun4c_bucket[entry] = (union task_union *) addr;
1045 if(sun4c_get_segmap(addr) == invalid_segment)
1046 get_locked_segment(addr);
1047
1048 /* We are changing the virtual color of the page(s)
1049 * so we must flush the cache to guarantee consistency.
1050 */
1051 sun4c_flush_page(pages);
1052#ifndef CONFIG_SUN4
1053 sun4c_flush_page(pages + PAGE_SIZE);
1054#endif
1055
1056 sun4c_put_pte(addr, BUCKET_PTE(pages));
1057#ifndef CONFIG_SUN4
1058 sun4c_put_pte(addr + PAGE_SIZE, BUCKET_PTE(pages + PAGE_SIZE));
1059#endif
1060
1061#ifdef CONFIG_DEBUG_STACK_USAGE
1062 memset((void *)addr, 0, PAGE_SIZE << THREAD_INFO_ORDER);
1063#endif /* DEBUG_STACK_USAGE */
1064
1065 return (struct thread_info *) addr;
1066}
1067
1068static void sun4c_free_thread_info(struct thread_info *ti)
1069{
1070 unsigned long tiaddr = (unsigned long) ti;
1071 unsigned long pages = BUCKET_PTE_PAGE(sun4c_get_pte(tiaddr));
1072 int entry = BUCKET_NUM(tiaddr);
1073
1074 /* We are deleting a mapping, so the flush here is mandatory. */
1075 sun4c_flush_page(tiaddr);
1076#ifndef CONFIG_SUN4
1077 sun4c_flush_page(tiaddr + PAGE_SIZE);
1078#endif
1079 sun4c_put_pte(tiaddr, 0);
1080#ifndef CONFIG_SUN4
1081 sun4c_put_pte(tiaddr + PAGE_SIZE, 0);
1082#endif
1083 sun4c_bucket[entry] = BUCKET_EMPTY;
1084 if (entry < sun4c_lowbucket_avail)
1085 sun4c_lowbucket_avail = entry;
1086
1087 free_pages(pages, THREAD_INFO_ORDER);
1088 garbage_collect(entry);
1089}
1090
1091static void __init sun4c_init_buckets(void)
1092{
1093 int entry;
1094
1095 if (sizeof(union thread_union) != (PAGE_SIZE << THREAD_INFO_ORDER)) {
1096 extern void thread_info_size_is_bolixed_pete(void);
1097 thread_info_size_is_bolixed_pete();
1098 }
1099
1100 for (entry = 0; entry < NR_TASK_BUCKETS; entry++)
1101 sun4c_bucket[entry] = BUCKET_EMPTY;
1102 sun4c_lowbucket_avail = 0;
1103}
1104
1105static unsigned long sun4c_iobuffer_start;
1106static unsigned long sun4c_iobuffer_end;
1107static unsigned long sun4c_iobuffer_high;
1108static unsigned long *sun4c_iobuffer_map;
1109static int iobuffer_map_size;
1110
1111/*
1112 * Alias our pages so they do not cause a trap.
1113 * Also one page may be aliased into several I/O areas and we may
1114 * finish these I/O separately.
1115 */
1116static char *sun4c_lockarea(char *vaddr, unsigned long size)
1117{
1118 unsigned long base, scan;
1119 unsigned long npages;
1120 unsigned long vpage;
1121 unsigned long pte;
1122 unsigned long apage;
1123 unsigned long high;
1124 unsigned long flags;
1125
1126 npages = (((unsigned long)vaddr & ~PAGE_MASK) +
1127 size + (PAGE_SIZE-1)) >> PAGE_SHIFT;
1128
1129 scan = 0;
1130 local_irq_save(flags);
1131 for (;;) {
1132 scan = find_next_zero_bit(sun4c_iobuffer_map,
1133 iobuffer_map_size, scan);
1134 if ((base = scan) + npages > iobuffer_map_size) goto abend;
1135 for (;;) {
1136 if (scan >= base + npages) goto found;
1137 if (test_bit(scan, sun4c_iobuffer_map)) break;
1138 scan++;
1139 }
1140 }
1141
1142found:
1143 high = ((base + npages) << PAGE_SHIFT) + sun4c_iobuffer_start;
1144 high = SUN4C_REAL_PGDIR_ALIGN(high);
1145 while (high > sun4c_iobuffer_high) {
1146 get_locked_segment(sun4c_iobuffer_high);
1147 sun4c_iobuffer_high += SUN4C_REAL_PGDIR_SIZE;
1148 }
1149
1150 vpage = ((unsigned long) vaddr) & PAGE_MASK;
1151 for (scan = base; scan < base+npages; scan++) {
1152 pte = ((vpage-PAGE_OFFSET) >> PAGE_SHIFT);
1153 pte |= pgprot_val(SUN4C_PAGE_KERNEL);
1154 pte |= _SUN4C_PAGE_NOCACHE;
1155 set_bit(scan, sun4c_iobuffer_map);
1156 apage = (scan << PAGE_SHIFT) + sun4c_iobuffer_start;
1157
1158 /* Flush original mapping so we see the right things later. */
1159 sun4c_flush_page(vpage);
1160
1161 sun4c_put_pte(apage, pte);
1162 vpage += PAGE_SIZE;
1163 }
1164 local_irq_restore(flags);
1165 return (char *) ((base << PAGE_SHIFT) + sun4c_iobuffer_start +
1166 (((unsigned long) vaddr) & ~PAGE_MASK));
1167
1168abend:
1169 local_irq_restore(flags);
1170 printk("DMA vaddr=0x%p size=%08lx\n", vaddr, size);
1171 panic("Out of iobuffer table");
1172 return NULL;
1173}
1174
1175static void sun4c_unlockarea(char *vaddr, unsigned long size)
1176{
1177 unsigned long vpage, npages;
1178 unsigned long flags;
1179 int scan, high;
1180
1181 vpage = (unsigned long)vaddr & PAGE_MASK;
1182 npages = (((unsigned long)vaddr & ~PAGE_MASK) +
1183 size + (PAGE_SIZE-1)) >> PAGE_SHIFT;
1184
1185 local_irq_save(flags);
1186 while (npages != 0) {
1187 --npages;
1188
1189 /* This mapping is marked non-cachable, no flush necessary. */
1190 sun4c_put_pte(vpage, 0);
1191 clear_bit((vpage - sun4c_iobuffer_start) >> PAGE_SHIFT,
1192 sun4c_iobuffer_map);
1193 vpage += PAGE_SIZE;
1194 }
1195
1196 /* garbage collect */
1197 scan = (sun4c_iobuffer_high - sun4c_iobuffer_start) >> PAGE_SHIFT;
1198 while (scan >= 0 && !sun4c_iobuffer_map[scan >> 5])
1199 scan -= 32;
1200 scan += 32;
1201 high = sun4c_iobuffer_start + (scan << PAGE_SHIFT);
1202 high = SUN4C_REAL_PGDIR_ALIGN(high) + SUN4C_REAL_PGDIR_SIZE;
1203 while (high < sun4c_iobuffer_high) {
1204 sun4c_iobuffer_high -= SUN4C_REAL_PGDIR_SIZE;
1205 free_locked_segment(sun4c_iobuffer_high);
1206 }
1207 local_irq_restore(flags);
1208}
1209
1210/* Note the scsi code at init time passes to here buffers
1211 * which sit on the kernel stack, those are already locked
1212 * by implication and fool the page locking code above
1213 * if passed to by mistake.
1214 */
1215static __u32 sun4c_get_scsi_one(char *bufptr, unsigned long len, struct sbus_bus *sbus)
1216{
1217 unsigned long page;
1218
1219 page = ((unsigned long)bufptr) & PAGE_MASK;
1220 if (!virt_addr_valid(page)) {
1221 sun4c_flush_page(page);
1222 return (__u32)bufptr; /* already locked */
1223 }
1224 return (__u32)sun4c_lockarea(bufptr, len);
1225}
1226
1227static void sun4c_get_scsi_sgl(struct scatterlist *sg, int sz, struct sbus_bus *sbus)
1228{
1229 while (sz != 0) {
1230 --sz;
1231 sg[sz].dvma_address = (__u32)sun4c_lockarea(page_address(sg[sz].page) + sg[sz].offset, sg[sz].length);
1232 sg[sz].dvma_length = sg[sz].length;
1233 }
1234}
1235
1236static 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
1243static 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[sz].dvma_address, sg[sz].length);
1248 }
1249}
1250
1251#define TASK_ENTRY_SIZE BUCKET_SIZE /* see above */
1252#define LONG_ALIGN(x) (((x)+(sizeof(long))-1)&~((sizeof(long))-1))
1253
1254struct vm_area_struct sun4c_kstack_vma;
1255
1256static void __init sun4c_init_lock_areas(void)
1257{
1258 unsigned long sun4c_taskstack_start;
1259 unsigned long sun4c_taskstack_end;
1260 int bitmap_size;
1261
1262 sun4c_init_buckets();
1263 sun4c_taskstack_start = SUN4C_LOCK_VADDR;
1264 sun4c_taskstack_end = (sun4c_taskstack_start +
1265 (TASK_ENTRY_SIZE * NR_TASK_BUCKETS));
1266 if (sun4c_taskstack_end >= SUN4C_LOCK_END) {
1267 prom_printf("Too many tasks, decrease NR_TASK_BUCKETS please.\n");
1268 prom_halt();
1269 }
1270
1271 sun4c_iobuffer_start = sun4c_iobuffer_high =
1272 SUN4C_REAL_PGDIR_ALIGN(sun4c_taskstack_end);
1273 sun4c_iobuffer_end = SUN4C_LOCK_END;
1274 bitmap_size = (sun4c_iobuffer_end - sun4c_iobuffer_start) >> PAGE_SHIFT;
1275 bitmap_size = (bitmap_size + 7) >> 3;
1276 bitmap_size = LONG_ALIGN(bitmap_size);
1277 iobuffer_map_size = bitmap_size << 3;
1278 sun4c_iobuffer_map = __alloc_bootmem(bitmap_size, SMP_CACHE_BYTES, 0UL);
1279 memset((void *) sun4c_iobuffer_map, 0, bitmap_size);
1280
1281 sun4c_kstack_vma.vm_mm = &init_mm;
1282 sun4c_kstack_vma.vm_start = sun4c_taskstack_start;
1283 sun4c_kstack_vma.vm_end = sun4c_taskstack_end;
1284 sun4c_kstack_vma.vm_page_prot = PAGE_SHARED;
1285 sun4c_kstack_vma.vm_flags = VM_READ | VM_WRITE | VM_EXEC;
1286 insert_vm_struct(&init_mm, &sun4c_kstack_vma);
1287}
1288
1289/* Cache flushing on the sun4c. */
1290static void sun4c_flush_cache_all(void)
1291{
1292 unsigned long begin, end;
1293
1294 flush_user_windows();
1295 begin = (KERNBASE + SUN4C_REAL_PGDIR_SIZE);
1296 end = (begin + SUN4C_VAC_SIZE);
1297
1298 if (sun4c_vacinfo.linesize == 32) {
1299 while (begin < end) {
1300 __asm__ __volatile__(
1301 "ld [%0 + 0x00], %%g0\n\t"
1302 "ld [%0 + 0x20], %%g0\n\t"
1303 "ld [%0 + 0x40], %%g0\n\t"
1304 "ld [%0 + 0x60], %%g0\n\t"
1305 "ld [%0 + 0x80], %%g0\n\t"
1306 "ld [%0 + 0xa0], %%g0\n\t"
1307 "ld [%0 + 0xc0], %%g0\n\t"
1308 "ld [%0 + 0xe0], %%g0\n\t"
1309 "ld [%0 + 0x100], %%g0\n\t"
1310 "ld [%0 + 0x120], %%g0\n\t"
1311 "ld [%0 + 0x140], %%g0\n\t"
1312 "ld [%0 + 0x160], %%g0\n\t"
1313 "ld [%0 + 0x180], %%g0\n\t"
1314 "ld [%0 + 0x1a0], %%g0\n\t"
1315 "ld [%0 + 0x1c0], %%g0\n\t"
1316 "ld [%0 + 0x1e0], %%g0\n"
1317 : : "r" (begin));
1318 begin += 512;
1319 }
1320 } else {
1321 while (begin < end) {
1322 __asm__ __volatile__(
1323 "ld [%0 + 0x00], %%g0\n\t"
1324 "ld [%0 + 0x10], %%g0\n\t"
1325 "ld [%0 + 0x20], %%g0\n\t"
1326 "ld [%0 + 0x30], %%g0\n\t"
1327 "ld [%0 + 0x40], %%g0\n\t"
1328 "ld [%0 + 0x50], %%g0\n\t"
1329 "ld [%0 + 0x60], %%g0\n\t"
1330 "ld [%0 + 0x70], %%g0\n\t"
1331 "ld [%0 + 0x80], %%g0\n\t"
1332 "ld [%0 + 0x90], %%g0\n\t"
1333 "ld [%0 + 0xa0], %%g0\n\t"
1334 "ld [%0 + 0xb0], %%g0\n\t"
1335 "ld [%0 + 0xc0], %%g0\n\t"
1336 "ld [%0 + 0xd0], %%g0\n\t"
1337 "ld [%0 + 0xe0], %%g0\n\t"
1338 "ld [%0 + 0xf0], %%g0\n"
1339 : : "r" (begin));
1340 begin += 256;
1341 }
1342 }
1343}
1344
1345static void sun4c_flush_cache_mm(struct mm_struct *mm)
1346{
1347 int new_ctx = mm->context;
1348
1349 if (new_ctx != NO_CONTEXT) {
1350 flush_user_windows();
1351
1352 if (sun4c_context_ring[new_ctx].num_entries) {
1353 struct sun4c_mmu_entry *head = &sun4c_context_ring[new_ctx].ringhd;
1354 unsigned long flags;
1355
1356 local_irq_save(flags);
1357 if (head->next != head) {
1358 struct sun4c_mmu_entry *entry = head->next;
1359 int savectx = sun4c_get_context();
1360
1361 sun4c_set_context(new_ctx);
1362 sun4c_flush_context();
1363 do {
1364 struct sun4c_mmu_entry *next = entry->next;
1365
1366 sun4c_user_unmap(entry);
1367 free_user_entry(new_ctx, entry);
1368
1369 entry = next;
1370 } while (entry != head);
1371 sun4c_set_context(savectx);
1372 }
1373 local_irq_restore(flags);
1374 }
1375 }
1376}
1377
1378static void sun4c_flush_cache_range(struct vm_area_struct *vma, unsigned long start, unsigned long end)
1379{
1380 struct mm_struct *mm = vma->vm_mm;
1381 int new_ctx = mm->context;
1382
1383 if (new_ctx != NO_CONTEXT) {
1384 struct sun4c_mmu_entry *head = &sun4c_context_ring[new_ctx].ringhd;
1385 struct sun4c_mmu_entry *entry;
1386 unsigned long flags;
1387
1388 flush_user_windows();
1389
1390 local_irq_save(flags);
1391 /* All user segmap chains are ordered on entry->vaddr. */
1392 for (entry = head->next;
1393 (entry != head) && ((entry->vaddr+SUN4C_REAL_PGDIR_SIZE) < start);
1394 entry = entry->next)
1395 ;
1396
1397 /* Tracing various job mixtures showed that this conditional
1398 * only passes ~35% of the time for most worse case situations,
1399 * therefore we avoid all of this gross overhead ~65% of the time.
1400 */
1401 if ((entry != head) && (entry->vaddr < end)) {
1402 int octx = sun4c_get_context();
1403 sun4c_set_context(new_ctx);
1404
1405 /* At this point, always, (start >= entry->vaddr) and
1406 * (entry->vaddr < end), once the latter condition
1407 * ceases to hold, or we hit the end of the list, we
1408 * exit the loop. The ordering of all user allocated
1409 * segmaps makes this all work out so beautifully.
1410 */
1411 do {
1412 struct sun4c_mmu_entry *next = entry->next;
1413 unsigned long realend;
1414
1415 /* "realstart" is always >= entry->vaddr */
1416 realend = entry->vaddr + SUN4C_REAL_PGDIR_SIZE;
1417 if (end < realend)
1418 realend = end;
1419 if ((realend - entry->vaddr) <= (PAGE_SIZE << 3)) {
1420 unsigned long page = entry->vaddr;
1421 while (page < realend) {
1422 sun4c_flush_page(page);
1423 page += PAGE_SIZE;
1424 }
1425 } else {
1426 sun4c_flush_segment(entry->vaddr);
1427 sun4c_user_unmap(entry);
1428 free_user_entry(new_ctx, entry);
1429 }
1430 entry = next;
1431 } while ((entry != head) && (entry->vaddr < end));
1432 sun4c_set_context(octx);
1433 }
1434 local_irq_restore(flags);
1435 }
1436}
1437
1438static void sun4c_flush_cache_page(struct vm_area_struct *vma, unsigned long page)
1439{
1440 struct mm_struct *mm = vma->vm_mm;
1441 int new_ctx = mm->context;
1442
1443 /* Sun4c has no separate I/D caches so cannot optimize for non
1444 * text page flushes.
1445 */
1446 if (new_ctx != NO_CONTEXT) {
1447 int octx = sun4c_get_context();
1448 unsigned long flags;
1449
1450 flush_user_windows();
1451 local_irq_save(flags);
1452 sun4c_set_context(new_ctx);
1453 sun4c_flush_page(page);
1454 sun4c_set_context(octx);
1455 local_irq_restore(flags);
1456 }
1457}
1458
1459static void sun4c_flush_page_to_ram(unsigned long page)
1460{
1461 unsigned long flags;
1462
1463 local_irq_save(flags);
1464 sun4c_flush_page(page);
1465 local_irq_restore(flags);
1466}
1467
1468/* Sun4c cache is unified, both instructions and data live there, so
1469 * no need to flush the on-stack instructions for new signal handlers.
1470 */
1471static void sun4c_flush_sig_insns(struct mm_struct *mm, unsigned long insn_addr)
1472{
1473}
1474
1475/* TLB flushing on the sun4c. These routines count on the cache
1476 * flushing code to flush the user register windows so that we need
1477 * not do so when we get here.
1478 */
1479
1480static void sun4c_flush_tlb_all(void)
1481{
1482 struct sun4c_mmu_entry *this_entry, *next_entry;
1483 unsigned long flags;
1484 int savectx, ctx;
1485
1486 local_irq_save(flags);
1487 this_entry = sun4c_kernel_ring.ringhd.next;
1488 savectx = sun4c_get_context();
1489 flush_user_windows();
1490 while (sun4c_kernel_ring.num_entries) {
1491 next_entry = this_entry->next;
1492 sun4c_flush_segment(this_entry->vaddr);
1493 for (ctx = 0; ctx < num_contexts; ctx++) {
1494 sun4c_set_context(ctx);
1495 sun4c_put_segmap(this_entry->vaddr, invalid_segment);
1496 }
1497 free_kernel_entry(this_entry, &sun4c_kernel_ring);
1498 this_entry = next_entry;
1499 }
1500 sun4c_set_context(savectx);
1501 local_irq_restore(flags);
1502}
1503
1504static void sun4c_flush_tlb_mm(struct mm_struct *mm)
1505{
1506 int new_ctx = mm->context;
1507
1508 if (new_ctx != NO_CONTEXT) {
1509 struct sun4c_mmu_entry *head = &sun4c_context_ring[new_ctx].ringhd;
1510 unsigned long flags;
1511
1512 local_irq_save(flags);
1513 if (head->next != head) {
1514 struct sun4c_mmu_entry *entry = head->next;
1515 int savectx = sun4c_get_context();
1516
1517 sun4c_set_context(new_ctx);
1518 sun4c_flush_context();
1519 do {
1520 struct sun4c_mmu_entry *next = entry->next;
1521
1522 sun4c_user_unmap(entry);
1523 free_user_entry(new_ctx, entry);
1524
1525 entry = next;
1526 } while (entry != head);
1527 sun4c_set_context(savectx);
1528 }
1529 local_irq_restore(flags);
1530 }
1531}
1532
1533static void sun4c_flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned long end)
1534{
1535 struct mm_struct *mm = vma->vm_mm;
1536 int new_ctx = mm->context;
1537
1538 if (new_ctx != NO_CONTEXT) {
1539 struct sun4c_mmu_entry *head = &sun4c_context_ring[new_ctx].ringhd;
1540 struct sun4c_mmu_entry *entry;
1541 unsigned long flags;
1542
1543 local_irq_save(flags);
1544 /* See commentary in sun4c_flush_cache_range(). */
1545 for (entry = head->next;
1546 (entry != head) && ((entry->vaddr+SUN4C_REAL_PGDIR_SIZE) < start);
1547 entry = entry->next)
1548 ;
1549
1550 if ((entry != head) && (entry->vaddr < end)) {
1551 int octx = sun4c_get_context();
1552
1553 sun4c_set_context(new_ctx);
1554 do {
1555 struct sun4c_mmu_entry *next = entry->next;
1556
1557 sun4c_flush_segment(entry->vaddr);
1558 sun4c_user_unmap(entry);
1559 free_user_entry(new_ctx, entry);
1560
1561 entry = next;
1562 } while ((entry != head) && (entry->vaddr < end));
1563 sun4c_set_context(octx);
1564 }
1565 local_irq_restore(flags);
1566 }
1567}
1568
1569static void sun4c_flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
1570{
1571 struct mm_struct *mm = vma->vm_mm;
1572 int new_ctx = mm->context;
1573
1574 if (new_ctx != NO_CONTEXT) {
1575 int savectx = sun4c_get_context();
1576 unsigned long flags;
1577
1578 local_irq_save(flags);
1579 sun4c_set_context(new_ctx);
1580 page &= PAGE_MASK;
1581 sun4c_flush_page(page);
1582 sun4c_put_pte(page, 0);
1583 sun4c_set_context(savectx);
1584 local_irq_restore(flags);
1585 }
1586}
1587
1588static inline void sun4c_mapioaddr(unsigned long physaddr, unsigned long virt_addr)
1589{
14778d90
DM		 1590 unsigned long page_entry, pg_iobits;
1591
1592 pg_iobits = _SUN4C_PAGE_PRESENT | _SUN4C_READABLE | _SUN4C_WRITEABLE |
1593 _SUN4C_PAGE_IO | _SUN4C_PAGE_NOCACHE;
1da177e4
LT		 1594
1595 page_entry = ((physaddr >> PAGE_SHIFT) & SUN4C_PFN_MASK);
1596 page_entry |= ((pg_iobits | _SUN4C_PAGE_PRIV) & ~(_SUN4C_PAGE_PRESENT));
1597 sun4c_put_pte(virt_addr, page_entry);
1598}
1599
1600static void sun4c_mapiorange(unsigned int bus, unsigned long xpa,
1601 unsigned long xva, unsigned int len)
1602{
1603 while (len != 0) {
1604 len -= PAGE_SIZE;
1605 sun4c_mapioaddr(xpa, xva);
1606 xva += PAGE_SIZE;
1607 xpa += PAGE_SIZE;
1608 }
1609}
1610
1611static void sun4c_unmapiorange(unsigned long virt_addr, unsigned int len)
1612{
1613 while (len != 0) {
1614 len -= PAGE_SIZE;
1615 sun4c_put_pte(virt_addr, 0);
1616 virt_addr += PAGE_SIZE;
1617 }
1618}
1619
1620static void sun4c_alloc_context(struct mm_struct *old_mm, struct mm_struct *mm)
1621{
1622 struct ctx_list *ctxp;
1623
1624 ctxp = ctx_free.next;
1625 if (ctxp != &ctx_free) {
1626 remove_from_ctx_list(ctxp);
1627 add_to_used_ctxlist(ctxp);
1628 mm->context = ctxp->ctx_number;
1629 ctxp->ctx_mm = mm;
1630 return;
1631 }
1632 ctxp = ctx_used.next;
1633 if (ctxp->ctx_mm == old_mm)
1634 ctxp = ctxp->next;
1635 remove_from_ctx_list(ctxp);
1636 add_to_used_ctxlist(ctxp);
1637 ctxp->ctx_mm->context = NO_CONTEXT;
1638 ctxp->ctx_mm = mm;
1639 mm->context = ctxp->ctx_number;
1640 sun4c_demap_context(&sun4c_context_ring[ctxp->ctx_number],
1641 ctxp->ctx_number);
1642}
1643
1644/* Switch the current MM context. */
1645static void sun4c_switch_mm(struct mm_struct *old_mm, struct mm_struct *mm, struct task_struct *tsk, int cpu)
1646{
1647 struct ctx_list *ctx;
1648 int dirty = 0;
1649
1650 if (mm->context == NO_CONTEXT) {
1651 dirty = 1;
1652 sun4c_alloc_context(old_mm, mm);
1653 } else {
1654 /* Update the LRU ring of contexts. */
1655 ctx = ctx_list_pool + mm->context;
1656 remove_from_ctx_list(ctx);
1657 add_to_used_ctxlist(ctx);
1658 }
1659 if (dirty || old_mm != mm)
1660 sun4c_set_context(mm->context);
1661}
1662
1663static void sun4c_destroy_context(struct mm_struct *mm)
1664{
1665 struct ctx_list *ctx_old;
1666
1667 if (mm->context != NO_CONTEXT) {
1668 sun4c_demap_context(&sun4c_context_ring[mm->context], mm->context);
1669 ctx_old = ctx_list_pool + mm->context;
1670 remove_from_ctx_list(ctx_old);
1671 add_to_free_ctxlist(ctx_old);
1672 mm->context = NO_CONTEXT;
1673 }
1674}
1675
1676static void sun4c_mmu_info(struct seq_file *m)
1677{
1678 int used_user_entries, i;
1679
1680 used_user_entries = 0;
1681 for (i = 0; i < num_contexts; i++)
1682 used_user_entries += sun4c_context_ring[i].num_entries;
1683
1684 seq_printf(m,
1685 "vacsize\t\t: %d bytes\n"
1686 "vachwflush\t: %s\n"
1687 "vaclinesize\t: %d bytes\n"
1688 "mmuctxs\t\t: %d\n"
1689 "mmupsegs\t: %d\n"
1690 "kernelpsegs\t: %d\n"
1691 "kfreepsegs\t: %d\n"
1692 "usedpsegs\t: %d\n"
1693 "ufreepsegs\t: %d\n"
1694 "user_taken\t: %d\n"
1695 "max_taken\t: %d\n",
1696 sun4c_vacinfo.num_bytes,
1697 (sun4c_vacinfo.do_hwflushes ? "yes" : "no"),
1698 sun4c_vacinfo.linesize,
1699 num_contexts,
1700 (invalid_segment + 1),
1701 sun4c_kernel_ring.num_entries,
1702 sun4c_kfree_ring.num_entries,
1703 used_user_entries,
1704 sun4c_ufree_ring.num_entries,
1705 sun4c_user_taken_entries,
1706 max_user_taken_entries);
1707}
1708
1709/* Nothing below here should touch the mmu hardware nor the mmu_entry
1710 * data structures.
1711 */
1712
1713/* First the functions which the mid-level code uses to directly
1714 * manipulate the software page tables. Some defines since we are
1715 * emulating the i386 page directory layout.
1716 */
1717#define PGD_PRESENT 0x001
1718#define PGD_RW 0x002
1719#define PGD_USER 0x004
1720#define PGD_ACCESSED 0x020
1721#define PGD_DIRTY 0x040
1722#define PGD_TABLE (PGD_PRESENT | PGD_RW | PGD_USER | PGD_ACCESSED | PGD_DIRTY)
1723
1724static void sun4c_set_pte(pte_t *ptep, pte_t pte)
1725{
1726 *ptep = pte;
1727}
1728
1729static void sun4c_pgd_set(pgd_t * pgdp, pmd_t * pmdp)
1730{
1731}
1732
1733static void sun4c_pmd_set(pmd_t * pmdp, pte_t * ptep)
1734{
1735 pmdp->pmdv[0] = PGD_TABLE | (unsigned long) ptep;
1736}
1737
1738static void sun4c_pmd_populate(pmd_t * pmdp, struct page * ptep)
1739{
1740 if (page_address(ptep) == NULL) BUG(); /* No highmem on sun4c */
1741 pmdp->pmdv[0] = PGD_TABLE | (unsigned long) page_address(ptep);
1742}
1743
1744static int sun4c_pte_present(pte_t pte)
1745{
1746 return ((pte_val(pte) & (_SUN4C_PAGE_PRESENT | _SUN4C_PAGE_PRIV)) != 0);
1747}
1748static void sun4c_pte_clear(pte_t *ptep) { *ptep = __pte(0); }
1749
1da177e4
LT		 1750static int sun4c_pmd_bad(pmd_t pmd)
1751{
1752 return (((pmd_val(pmd) & ~PAGE_MASK) != PGD_TABLE) ||
1753 (!virt_addr_valid(pmd_val(pmd))));
1754}
1755
1756static int sun4c_pmd_present(pmd_t pmd)
1757{
1758 return ((pmd_val(pmd) & PGD_PRESENT) != 0);
1759}
1760
1761#if 0 /* if PMD takes one word */
1762static void sun4c_pmd_clear(pmd_t *pmdp) { *pmdp = __pmd(0); }
1763#else /* if pmd_t is a longish aggregate */
1764static void sun4c_pmd_clear(pmd_t *pmdp) {
1765 memset((void *)pmdp, 0, sizeof(pmd_t));
1766}
1767#endif
1768
1769static int sun4c_pgd_none(pgd_t pgd) { return 0; }
1770static int sun4c_pgd_bad(pgd_t pgd) { return 0; }
1771static int sun4c_pgd_present(pgd_t pgd) { return 1; }
1772static void sun4c_pgd_clear(pgd_t * pgdp) { }
1773
1774/*
1775 * The following only work if pte_present() is true.
1776 * Undefined behaviour if not..
1777 */
1778static pte_t sun4c_pte_mkwrite(pte_t pte)
1779{
1780 pte = __pte(pte_val(pte) | _SUN4C_PAGE_WRITE);
1781 if (pte_val(pte) & _SUN4C_PAGE_MODIFIED)
1782 pte = __pte(pte_val(pte) | _SUN4C_PAGE_SILENT_WRITE);
1783 return pte;
1784}
1785
1786static pte_t sun4c_pte_mkdirty(pte_t pte)
1787{
1788 pte = __pte(pte_val(pte) | _SUN4C_PAGE_MODIFIED);
1789 if (pte_val(pte) & _SUN4C_PAGE_WRITE)
1790 pte = __pte(pte_val(pte) | _SUN4C_PAGE_SILENT_WRITE);
1791 return pte;
1792}
1793
1794static pte_t sun4c_pte_mkyoung(pte_t pte)
1795{
1796 pte = __pte(pte_val(pte) | _SUN4C_PAGE_ACCESSED);
1797 if (pte_val(pte) & _SUN4C_PAGE_READ)
1798 pte = __pte(pte_val(pte) | _SUN4C_PAGE_SILENT_READ);
1799 return pte;
1800}
1801
1802/*
1803 * Conversion functions: convert a page and protection to a page entry,
1804 * and a page entry and page directory to the page they refer to.
1805 */
1806static pte_t sun4c_mk_pte(struct page *page, pgprot_t pgprot)
1807{
1808 return __pte(page_to_pfn(page) | pgprot_val(pgprot));
1809}
1810
1811static pte_t sun4c_mk_pte_phys(unsigned long phys_page, pgprot_t pgprot)
1812{
1813 return __pte((phys_page >> PAGE_SHIFT) | pgprot_val(pgprot));
1814}
1815
1816static pte_t sun4c_mk_pte_io(unsigned long page, pgprot_t pgprot, int space)
1817{
1818 return __pte(((page - PAGE_OFFSET) >> PAGE_SHIFT) | pgprot_val(pgprot));
1819}
1820
1821static unsigned long sun4c_pte_pfn(pte_t pte)
1822{
1823 return pte_val(pte) & SUN4C_PFN_MASK;
1824}
1825
1826static pte_t sun4c_pgoff_to_pte(unsigned long pgoff)
1827{
1828 return __pte(pgoff | _SUN4C_PAGE_FILE);
1829}
1830
1831static unsigned long sun4c_pte_to_pgoff(pte_t pte)
1832{
1833 return pte_val(pte) & ((1UL << PTE_FILE_MAX_BITS) - 1);
1834}
1835
1836
1837static __inline__ unsigned long sun4c_pmd_page_v(pmd_t pmd)
1838{
1839 return (pmd_val(pmd) & PAGE_MASK);
1840}
1841
1842static struct page *sun4c_pmd_page(pmd_t pmd)
1843{
1844 return virt_to_page(sun4c_pmd_page_v(pmd));
1845}
1846
1847static unsigned long sun4c_pgd_page(pgd_t pgd) { return 0; }
1848
1849/* to find an entry in a page-table-directory */
1850static inline pgd_t *sun4c_pgd_offset(struct mm_struct * mm, unsigned long address)
1851{
1852 return mm->pgd + (address >> SUN4C_PGDIR_SHIFT);
1853}
1854
1855/* Find an entry in the second-level page table.. */
1856static pmd_t *sun4c_pmd_offset(pgd_t * dir, unsigned long address)
1857{
1858 return (pmd_t *) dir;
1859}
1860
1861/* Find an entry in the third-level page table.. */
1862pte_t *sun4c_pte_offset_kernel(pmd_t * dir, unsigned long address)
1863{
1864 return (pte_t *) sun4c_pmd_page_v(*dir) +
1865 ((address >> PAGE_SHIFT) & (SUN4C_PTRS_PER_PTE - 1));
1866}
1867
1868static unsigned long sun4c_swp_type(swp_entry_t entry)
1869{
1870 return (entry.val & SUN4C_SWP_TYPE_MASK);
1871}
1872
1873static unsigned long sun4c_swp_offset(swp_entry_t entry)
1874{
1875 return (entry.val >> SUN4C_SWP_OFF_SHIFT) & SUN4C_SWP_OFF_MASK;
1876}
1877
1878static swp_entry_t sun4c_swp_entry(unsigned long type, unsigned long offset)
1879{
1880 return (swp_entry_t) {
1881 (offset & SUN4C_SWP_OFF_MASK) << SUN4C_SWP_OFF_SHIFT
1882 | (type & SUN4C_SWP_TYPE_MASK) };
1883}
1884
1885static void sun4c_free_pte_slow(pte_t *pte)
1886{
1887 free_page((unsigned long)pte);
1888}
1889
1890static void sun4c_free_pgd_slow(pgd_t *pgd)
1891{
1892 free_page((unsigned long)pgd);
1893}
1894
1895static pgd_t *sun4c_get_pgd_fast(void)
1896{
1897 unsigned long *ret;
1898
1899 if ((ret = pgd_quicklist) != NULL) {
1900 pgd_quicklist = (unsigned long *)(*ret);
1901 ret[0] = ret[1];
1902 pgtable_cache_size--;
1903 } else {
1904 pgd_t *init;
1905
1906 ret = (unsigned long *)__get_free_page(GFP_KERNEL);
1907 memset (ret, 0, (KERNBASE / SUN4C_PGDIR_SIZE) * sizeof(pgd_t));
1908 init = sun4c_pgd_offset(&init_mm, 0);
1909 memcpy (((pgd_t *)ret) + USER_PTRS_PER_PGD, init + USER_PTRS_PER_PGD,
1910 (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
1911 }
1912 return (pgd_t *)ret;
1913}
1914
1915static void sun4c_free_pgd_fast(pgd_t *pgd)
1916{
1917 *(unsigned long *)pgd = (unsigned long) pgd_quicklist;
1918 pgd_quicklist = (unsigned long *) pgd;
1919 pgtable_cache_size++;
1920}
1921
1922
1923static __inline__ pte_t *
1924sun4c_pte_alloc_one_fast(struct mm_struct *mm, unsigned long address)
1925{
1926 unsigned long *ret;
1927
1928 if ((ret = (unsigned long *)pte_quicklist) != NULL) {
1929 pte_quicklist = (unsigned long *)(*ret);
1930 ret[0] = ret[1];
1931 pgtable_cache_size--;
1932 }
1933 return (pte_t *)ret;
1934}
1935
1936static pte_t *sun4c_pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)
1937{
1938 pte_t *pte;
1939
1940 if ((pte = sun4c_pte_alloc_one_fast(mm, address)) != NULL)
1941 return pte;
1942
1943 pte = (pte_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT);
1944 if (pte)
1945 memset(pte, 0, PAGE_SIZE);
1946 return pte;
1947}
1948
1949static struct page *sun4c_pte_alloc_one(struct mm_struct *mm, unsigned long address)
1950{
1951 pte_t *pte = sun4c_pte_alloc_one_kernel(mm, address);
1952 if (pte == NULL)
1953 return NULL;
1954 return virt_to_page(pte);
1955}
1956
1957static __inline__ void sun4c_free_pte_fast(pte_t *pte)
1958{
1959 *(unsigned long *)pte = (unsigned long) pte_quicklist;
1960 pte_quicklist = (unsigned long *) pte;
1961 pgtable_cache_size++;
1962}
1963
1964static void sun4c_pte_free(struct page *pte)
1965{
1966 sun4c_free_pte_fast(page_address(pte));
1967}
1968
1969/*
1970 * allocating and freeing a pmd is trivial: the 1-entry pmd is
1971 * inside the pgd, so has no extra memory associated with it.
1972 */
1973static pmd_t *sun4c_pmd_alloc_one(struct mm_struct *mm, unsigned long address)
1974{
1975 BUG();
1976 return NULL;
1977}
1978
1979static void sun4c_free_pmd_fast(pmd_t * pmd) { }
1980
1981static void sun4c_check_pgt_cache(int low, int high)
1982{
1983 if (pgtable_cache_size > high) {
1984 do {
1985 if (pgd_quicklist)
1986 sun4c_free_pgd_slow(sun4c_get_pgd_fast());
1987 if (pte_quicklist)
1988 sun4c_free_pte_slow(sun4c_pte_alloc_one_fast(NULL, 0));
1989 } while (pgtable_cache_size > low);
1990 }
1991}
1992
1993/* An experiment, turn off by default for now... -DaveM */
1994#define SUN4C_PRELOAD_PSEG
1995
1996void sun4c_update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t pte)
1997{
1998 unsigned long flags;
1999 int pseg;
2000
da4e9fea
MF		 2001 if (vma->vm_mm->context == NO_CONTEXT)
2002 return;
2003
1da177e4
LT		 2004 local_irq_save(flags);
2005 address &= PAGE_MASK;
2006 if ((pseg = sun4c_get_segmap(address)) == invalid_segment) {
2007 struct sun4c_mmu_entry *entry = sun4c_user_strategy();
2008 struct mm_struct *mm = vma->vm_mm;
2009 unsigned long start, end;
2010
2011 entry->vaddr = start = (address & SUN4C_REAL_PGDIR_MASK);
2012 entry->ctx = mm->context;
2013 add_ring_ordered(sun4c_context_ring + mm->context, entry);
2014 sun4c_put_segmap(entry->vaddr, entry->pseg);
2015 end = start + SUN4C_REAL_PGDIR_SIZE;
2016 while (start < end) {
2017#ifdef SUN4C_PRELOAD_PSEG
2018 pgd_t *pgdp = sun4c_pgd_offset(mm, start);
2019 pte_t *ptep;
2020
2021 if (!pgdp)
2022 goto no_mapping;
2023 ptep = sun4c_pte_offset_kernel((pmd_t *) pgdp, start);
2024 if (!ptep || !(pte_val(*ptep) & _SUN4C_PAGE_PRESENT))
2025 goto no_mapping;
2026 sun4c_put_pte(start, pte_val(*ptep));
2027 goto next;
2028
2029 no_mapping:
2030#endif
2031 sun4c_put_pte(start, 0);
2032#ifdef SUN4C_PRELOAD_PSEG
2033 next:
2034#endif
2035 start += PAGE_SIZE;
2036 }
2037#ifndef SUN4C_PRELOAD_PSEG
2038 sun4c_put_pte(address, pte_val(pte));
2039#endif
2040 local_irq_restore(flags);
2041 return;
2042 } else {
2043 struct sun4c_mmu_entry *entry = &mmu_entry_pool[pseg];
2044
2045 remove_lru(entry);
2046 add_lru(entry);
2047 }
2048
2049 sun4c_put_pte(address, pte_val(pte));
2050 local_irq_restore(flags);
2051}
2052
2053extern void sparc_context_init(int);
2054extern unsigned long end;
2055extern unsigned long bootmem_init(unsigned long *pages_avail);
2056extern unsigned long last_valid_pfn;
2057
2058void __init sun4c_paging_init(void)
2059{
2060 int i, cnt;
2061 unsigned long kernel_end, vaddr;
2062 extern struct resource sparc_iomap;
2063 unsigned long end_pfn, pages_avail;
2064
2065 kernel_end = (unsigned long) &end;
1da177e4
LT		 2066 kernel_end = SUN4C_REAL_PGDIR_ALIGN(kernel_end);
2067
2068 pages_avail = 0;
2069 last_valid_pfn = bootmem_init(&pages_avail);
2070 end_pfn = last_valid_pfn;
2071
2072 sun4c_probe_mmu();
2073 invalid_segment = (num_segmaps - 1);
2074 sun4c_init_mmu_entry_pool();
2075 sun4c_init_rings();
2076 sun4c_init_map_kernelprom(kernel_end);
2077 sun4c_init_clean_mmu(kernel_end);
2078 sun4c_init_fill_kernel_ring(SUN4C_KERNEL_BUCKETS);
2079 sun4c_init_lock_area(sparc_iomap.start, IOBASE_END);
2080 sun4c_init_lock_area(DVMA_VADDR, DVMA_END);
2081 sun4c_init_lock_areas();
2082 sun4c_init_fill_user_ring();
2083
2084 sun4c_set_context(0);
2085 memset(swapper_pg_dir, 0, PAGE_SIZE);
2086 memset(pg0, 0, PAGE_SIZE);
2087 memset(pg1, 0, PAGE_SIZE);
2088 memset(pg2, 0, PAGE_SIZE);
2089 memset(pg3, 0, PAGE_SIZE);
2090
2091 /* Save work later. */
2092 vaddr = VMALLOC_START;
2093 swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg0);
2094 vaddr += SUN4C_PGDIR_SIZE;
2095 swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg1);
2096 vaddr += SUN4C_PGDIR_SIZE;
2097 swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg2);
2098 vaddr += SUN4C_PGDIR_SIZE;
2099 swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg3);
2100 sun4c_init_ss2_cache_bug();
2101 sparc_context_init(num_contexts);
2102
2103 {
2104 unsigned long zones_size[MAX_NR_ZONES];
2105 unsigned long zholes_size[MAX_NR_ZONES];
2106 unsigned long npages;
2107 int znum;
2108
2109 for (znum = 0; znum < MAX_NR_ZONES; znum++)
2110 zones_size[znum] = zholes_size[znum] = 0;
2111
2112 npages = max_low_pfn - pfn_base;
2113
2114 zones_size[ZONE_DMA] = npages;
2115 zholes_size[ZONE_DMA] = npages - pages_avail;
2116
2117 npages = highend_pfn - max_low_pfn;
2118 zones_size[ZONE_HIGHMEM] = npages;
2119 zholes_size[ZONE_HIGHMEM] = npages - calc_highpages();
2120
2121 free_area_init_node(0, &contig_page_data, zones_size,
2122 pfn_base, zholes_size);
2123 }
2124
2125 cnt = 0;
2126 for (i = 0; i < num_segmaps; i++)
2127 if (mmu_entry_pool[i].locked)
2128 cnt++;
2129
2130 max_user_taken_entries = num_segmaps - cnt - 40 - 1;
2131
2132 printk("SUN4C: %d mmu entries for the kernel\n", cnt);
2133}
2134
14778d90
DM		 2135static pgprot_t sun4c_pgprot_noncached(pgprot_t prot)
2136{
2137 prot |= __pgprot(_SUN4C_PAGE_IO | _SUN4C_PAGE_NOCACHE);
2138
2139 return prot;
2140}
2141
1da177e4
LT		 2142/* Load up routines and constants for sun4c mmu */
2143void __init ld_mmu_sun4c(void)
2144{
2145 extern void ___xchg32_sun4c(void);
2146
2147 printk("Loading sun4c MMU routines\n");
2148
2149 /* First the constants */
2150 BTFIXUPSET_SIMM13(pgdir_shift, SUN4C_PGDIR_SHIFT);
2151 BTFIXUPSET_SETHI(pgdir_size, SUN4C_PGDIR_SIZE);
2152 BTFIXUPSET_SETHI(pgdir_mask, SUN4C_PGDIR_MASK);
2153
2154 BTFIXUPSET_SIMM13(ptrs_per_pmd, SUN4C_PTRS_PER_PMD);
2155 BTFIXUPSET_SIMM13(ptrs_per_pgd, SUN4C_PTRS_PER_PGD);
2156 BTFIXUPSET_SIMM13(user_ptrs_per_pgd, KERNBASE / SUN4C_PGDIR_SIZE);
2157
2158 BTFIXUPSET_INT(page_none, pgprot_val(SUN4C_PAGE_NONE));
378e515c 2159 PAGE_SHARED = pgprot_val(SUN4C_PAGE_SHARED);
1da177e4
LT		 2160 BTFIXUPSET_INT(page_copy, pgprot_val(SUN4C_PAGE_COPY));
2161 BTFIXUPSET_INT(page_readonly, pgprot_val(SUN4C_PAGE_READONLY));
2162 BTFIXUPSET_INT(page_kernel, pgprot_val(SUN4C_PAGE_KERNEL));
2163 page_kernel = pgprot_val(SUN4C_PAGE_KERNEL);
1da177e4
LT		 2164
2165 /* Functions */
14778d90 2166 BTFIXUPSET_CALL(pgprot_noncached, sun4c_pgprot_noncached, BTFIXUPCALL_NORM);
1da177e4
LT		 2167 BTFIXUPSET_CALL(___xchg32, ___xchg32_sun4c, BTFIXUPCALL_NORM);
2168 BTFIXUPSET_CALL(do_check_pgt_cache, sun4c_check_pgt_cache, BTFIXUPCALL_NORM);
2169
2170 BTFIXUPSET_CALL(flush_cache_all, sun4c_flush_cache_all, BTFIXUPCALL_NORM);
2171
2172 if (sun4c_vacinfo.do_hwflushes) {
2173 BTFIXUPSET_CALL(sun4c_flush_page, sun4c_flush_page_hw, BTFIXUPCALL_NORM);
2174 BTFIXUPSET_CALL(sun4c_flush_segment, sun4c_flush_segment_hw, BTFIXUPCALL_NORM);
2175 BTFIXUPSET_CALL(sun4c_flush_context, sun4c_flush_context_hw, BTFIXUPCALL_NORM);
2176 } else {
2177 BTFIXUPSET_CALL(sun4c_flush_page, sun4c_flush_page_sw, BTFIXUPCALL_NORM);
2178 BTFIXUPSET_CALL(sun4c_flush_segment, sun4c_flush_segment_sw, BTFIXUPCALL_NORM);
2179 BTFIXUPSET_CALL(sun4c_flush_context, sun4c_flush_context_sw, BTFIXUPCALL_NORM);
2180 }
2181
2182 BTFIXUPSET_CALL(flush_tlb_mm, sun4c_flush_tlb_mm, BTFIXUPCALL_NORM);
2183 BTFIXUPSET_CALL(flush_cache_mm, sun4c_flush_cache_mm, BTFIXUPCALL_NORM);
2184 BTFIXUPSET_CALL(destroy_context, sun4c_destroy_context, BTFIXUPCALL_NORM);
2185 BTFIXUPSET_CALL(switch_mm, sun4c_switch_mm, BTFIXUPCALL_NORM);
2186 BTFIXUPSET_CALL(flush_cache_page, sun4c_flush_cache_page, BTFIXUPCALL_NORM);
2187 BTFIXUPSET_CALL(flush_tlb_page, sun4c_flush_tlb_page, BTFIXUPCALL_NORM);
2188 BTFIXUPSET_CALL(flush_tlb_range, sun4c_flush_tlb_range, BTFIXUPCALL_NORM);
2189 BTFIXUPSET_CALL(flush_cache_range, sun4c_flush_cache_range, BTFIXUPCALL_NORM);
2190 BTFIXUPSET_CALL(__flush_page_to_ram, sun4c_flush_page_to_ram, BTFIXUPCALL_NORM);
2191 BTFIXUPSET_CALL(flush_tlb_all, sun4c_flush_tlb_all, BTFIXUPCALL_NORM);
2192
2193 BTFIXUPSET_CALL(flush_sig_insns, sun4c_flush_sig_insns, BTFIXUPCALL_NOP);
2194
2195 BTFIXUPSET_CALL(set_pte, sun4c_set_pte, BTFIXUPCALL_STO1O0);
2196
2197 /* The 2.4.18 code does not set this on sun4c, how does it work? XXX */
2198 /* BTFIXUPSET_SETHI(none_mask, 0x00000000); */ /* Defaults to zero? */
2199
2200 BTFIXUPSET_CALL(pte_pfn, sun4c_pte_pfn, BTFIXUPCALL_NORM);
2201#if 0 /* PAGE_SHIFT <= 12 */ /* Eek. Investigate. XXX */
2202 BTFIXUPSET_CALL(pmd_page, sun4c_pmd_page, BTFIXUPCALL_ANDNINT(PAGE_SIZE - 1));
2203#else
2204 BTFIXUPSET_CALL(pmd_page, sun4c_pmd_page, BTFIXUPCALL_NORM);
2205#endif
2206 BTFIXUPSET_CALL(pmd_set, sun4c_pmd_set, BTFIXUPCALL_NORM);
2207 BTFIXUPSET_CALL(pmd_populate, sun4c_pmd_populate, BTFIXUPCALL_NORM);
2208
2209 BTFIXUPSET_CALL(pte_present, sun4c_pte_present, BTFIXUPCALL_NORM);
2210 BTFIXUPSET_CALL(pte_clear, sun4c_pte_clear, BTFIXUPCALL_STG0O0);
1da177e4
LT		 2211
2212 BTFIXUPSET_CALL(pmd_bad, sun4c_pmd_bad, BTFIXUPCALL_NORM);
2213 BTFIXUPSET_CALL(pmd_present, sun4c_pmd_present, BTFIXUPCALL_NORM);
2214 BTFIXUPSET_CALL(pmd_clear, sun4c_pmd_clear, BTFIXUPCALL_STG0O0);
2215
2216 BTFIXUPSET_CALL(pgd_none, sun4c_pgd_none, BTFIXUPCALL_RETINT(0));
2217 BTFIXUPSET_CALL(pgd_bad, sun4c_pgd_bad, BTFIXUPCALL_RETINT(0));
2218 BTFIXUPSET_CALL(pgd_present, sun4c_pgd_present, BTFIXUPCALL_RETINT(1));
2219 BTFIXUPSET_CALL(pgd_clear, sun4c_pgd_clear, BTFIXUPCALL_NOP);
2220
2221 BTFIXUPSET_CALL(mk_pte, sun4c_mk_pte, BTFIXUPCALL_NORM);
2222 BTFIXUPSET_CALL(mk_pte_phys, sun4c_mk_pte_phys, BTFIXUPCALL_NORM);
2223 BTFIXUPSET_CALL(mk_pte_io, sun4c_mk_pte_io, BTFIXUPCALL_NORM);
2224
2225 BTFIXUPSET_INT(pte_modify_mask, _SUN4C_PAGE_CHG_MASK);
2226 BTFIXUPSET_CALL(pmd_offset, sun4c_pmd_offset, BTFIXUPCALL_NORM);
2227 BTFIXUPSET_CALL(pte_offset_kernel, sun4c_pte_offset_kernel, BTFIXUPCALL_NORM);
2228 BTFIXUPSET_CALL(free_pte_fast, sun4c_free_pte_fast, BTFIXUPCALL_NORM);
2229 BTFIXUPSET_CALL(pte_free, sun4c_pte_free, BTFIXUPCALL_NORM);
2230 BTFIXUPSET_CALL(pte_alloc_one_kernel, sun4c_pte_alloc_one_kernel, BTFIXUPCALL_NORM);
2231 BTFIXUPSET_CALL(pte_alloc_one, sun4c_pte_alloc_one, BTFIXUPCALL_NORM);
2232 BTFIXUPSET_CALL(free_pmd_fast, sun4c_free_pmd_fast, BTFIXUPCALL_NOP);
2233 BTFIXUPSET_CALL(pmd_alloc_one, sun4c_pmd_alloc_one, BTFIXUPCALL_RETO0);
2234 BTFIXUPSET_CALL(free_pgd_fast, sun4c_free_pgd_fast, BTFIXUPCALL_NORM);
2235 BTFIXUPSET_CALL(get_pgd_fast, sun4c_get_pgd_fast, BTFIXUPCALL_NORM);
2236
2237 BTFIXUPSET_HALF(pte_writei, _SUN4C_PAGE_WRITE);
2238 BTFIXUPSET_HALF(pte_dirtyi, _SUN4C_PAGE_MODIFIED);
2239 BTFIXUPSET_HALF(pte_youngi, _SUN4C_PAGE_ACCESSED);
2240 BTFIXUPSET_HALF(pte_filei, _SUN4C_PAGE_FILE);
2241 BTFIXUPSET_HALF(pte_wrprotecti, _SUN4C_PAGE_WRITE|_SUN4C_PAGE_SILENT_WRITE);
2242 BTFIXUPSET_HALF(pte_mkcleani, _SUN4C_PAGE_MODIFIED|_SUN4C_PAGE_SILENT_WRITE);
2243 BTFIXUPSET_HALF(pte_mkoldi, _SUN4C_PAGE_ACCESSED|_SUN4C_PAGE_SILENT_READ);
2244 BTFIXUPSET_CALL(pte_mkwrite, sun4c_pte_mkwrite, BTFIXUPCALL_NORM);
2245 BTFIXUPSET_CALL(pte_mkdirty, sun4c_pte_mkdirty, BTFIXUPCALL_NORM);
2246 BTFIXUPSET_CALL(pte_mkyoung, sun4c_pte_mkyoung, BTFIXUPCALL_NORM);
2247 BTFIXUPSET_CALL(update_mmu_cache, sun4c_update_mmu_cache, BTFIXUPCALL_NORM);
2248
2249 BTFIXUPSET_CALL(pte_to_pgoff, sun4c_pte_to_pgoff, BTFIXUPCALL_NORM);
2250 BTFIXUPSET_CALL(pgoff_to_pte, sun4c_pgoff_to_pte, BTFIXUPCALL_NORM);
2251
2252 BTFIXUPSET_CALL(mmu_lockarea, sun4c_lockarea, BTFIXUPCALL_NORM);
2253 BTFIXUPSET_CALL(mmu_unlockarea, sun4c_unlockarea, BTFIXUPCALL_NORM);
2254
2255 BTFIXUPSET_CALL(mmu_get_scsi_one, sun4c_get_scsi_one, BTFIXUPCALL_NORM);
2256 BTFIXUPSET_CALL(mmu_get_scsi_sgl, sun4c_get_scsi_sgl, BTFIXUPCALL_NORM);
2257 BTFIXUPSET_CALL(mmu_release_scsi_one, sun4c_release_scsi_one, BTFIXUPCALL_NORM);
2258 BTFIXUPSET_CALL(mmu_release_scsi_sgl, sun4c_release_scsi_sgl, BTFIXUPCALL_NORM);
2259
2260 BTFIXUPSET_CALL(mmu_map_dma_area, sun4c_map_dma_area, BTFIXUPCALL_NORM);
2261 BTFIXUPSET_CALL(mmu_unmap_dma_area, sun4c_unmap_dma_area, BTFIXUPCALL_NORM);
2262 BTFIXUPSET_CALL(mmu_translate_dvma, sun4c_translate_dvma, BTFIXUPCALL_NORM);
2263
2264 BTFIXUPSET_CALL(sparc_mapiorange, sun4c_mapiorange, BTFIXUPCALL_NORM);
2265 BTFIXUPSET_CALL(sparc_unmapiorange, sun4c_unmapiorange, BTFIXUPCALL_NORM);
2266
2267 BTFIXUPSET_CALL(__swp_type, sun4c_swp_type, BTFIXUPCALL_NORM);
2268 BTFIXUPSET_CALL(__swp_offset, sun4c_swp_offset, BTFIXUPCALL_NORM);
2269 BTFIXUPSET_CALL(__swp_entry, sun4c_swp_entry, BTFIXUPCALL_NORM);
2270
2271 BTFIXUPSET_CALL(alloc_thread_info, sun4c_alloc_thread_info, BTFIXUPCALL_NORM);
2272 BTFIXUPSET_CALL(free_thread_info, sun4c_free_thread_info, BTFIXUPCALL_NORM);
2273
2274 BTFIXUPSET_CALL(mmu_info, sun4c_mmu_info, BTFIXUPCALL_NORM);
2275
2276 /* These should _never_ get called with two level tables. */
2277 BTFIXUPSET_CALL(pgd_set, sun4c_pgd_set, BTFIXUPCALL_NOP);
46a82b2d 2278 BTFIXUPSET_CALL(pgd_page_vaddr, sun4c_pgd_page, BTFIXUPCALL_RETO0);
1da177e4 2279}
Linux kernel - Deliverables
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