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-rw-r--r--arch/sparc/mm/sun4c.c2276
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diff --git a/arch/sparc/mm/sun4c.c b/arch/sparc/mm/sun4c.c
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1/* $Id: sun4c.c,v 1.212 2001/12/21 04:56:15 davem Exp $
2 * sun4c.c: Doing in software what should be done in hardware.
3 *
4 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
5 * Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be)
6 * Copyright (C) 1996 Andrew Tridgell (Andrew.Tridgell@anu.edu.au)
7 * Copyright (C) 1997-2000 Anton Blanchard (anton@samba.org)
8 * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
9 */
10
11#define NR_TASK_BUCKETS 512
12
13#include <linux/config.h>
14#include <linux/kernel.h>
15#include <linux/mm.h>
16#include <linux/init.h>
17#include <linux/bootmem.h>
18#include <linux/highmem.h>
19#include <linux/fs.h>
20#include <linux/seq_file.h>
21
22#include <asm/scatterlist.h>
23#include <asm/page.h>
24#include <asm/pgalloc.h>
25#include <asm/pgtable.h>
26#include <asm/vaddrs.h>
27#include <asm/idprom.h>
28#include <asm/machines.h>
29#include <asm/memreg.h>
30#include <asm/processor.h>
31#include <asm/auxio.h>
32#include <asm/io.h>
33#include <asm/oplib.h>
34#include <asm/openprom.h>
35#include <asm/mmu_context.h>
36#include <asm/sun4paddr.h>
37#include <asm/highmem.h>
38#include <asm/btfixup.h>
39#include <asm/cacheflush.h>
40#include <asm/tlbflush.h>
41
42/* Because of our dynamic kernel TLB miss strategy, and how
43 * our DVMA mapping allocation works, you _MUST_:
44 *
45 * 1) Disable interrupts _and_ not touch any dynamic kernel
46 * memory while messing with kernel MMU state. By
47 * dynamic memory I mean any object which is not in
48 * the kernel image itself or a thread_union (both of
49 * which are locked into the MMU).
50 * 2) Disable interrupts while messing with user MMU state.
51 */
52
53extern int num_segmaps, num_contexts;
54
55extern unsigned long page_kernel;
56
57#ifdef CONFIG_SUN4
58#define SUN4C_VAC_SIZE sun4c_vacinfo.num_bytes
59#else
60/* That's it, we prom_halt() on sun4c if the cache size is something other than 65536.
61 * So let's save some cycles and just use that everywhere except for that bootup
62 * sanity check.
63 */
64#define SUN4C_VAC_SIZE 65536
65#endif
66
67#define SUN4C_KERNEL_BUCKETS 32
68
69/* Flushing the cache. */
70struct sun4c_vac_props sun4c_vacinfo;
71unsigned long sun4c_kernel_faults;
72
73/* Invalidate every sun4c cache line tag. */
74static void __init sun4c_flush_all(void)
75{
76 unsigned long begin, end;
77
78 if (sun4c_vacinfo.on)
79 panic("SUN4C: AIEEE, trying to invalidate vac while it is on.");
80
81 /* Clear 'valid' bit in all cache line tags */
82 begin = AC_CACHETAGS;
83 end = (AC_CACHETAGS + SUN4C_VAC_SIZE);
84 while (begin < end) {
85 __asm__ __volatile__("sta %%g0, [%0] %1\n\t" : :
86 "r" (begin), "i" (ASI_CONTROL));
87 begin += sun4c_vacinfo.linesize;
88 }
89}
90
91static void sun4c_flush_context_hw(void)
92{
93 unsigned long end = SUN4C_VAC_SIZE;
94
95 __asm__ __volatile__(
96 "1: addcc %0, -4096, %0\n\t"
97 " bne 1b\n\t"
98 " sta %%g0, [%0] %2"
99 : "=&r" (end)
100 : "0" (end), "i" (ASI_HWFLUSHCONTEXT)
101 : "cc");
102}
103
104/* Must be called minimally with IRQs disabled. */
105static void sun4c_flush_segment_hw(unsigned long addr)
106{
107 if (sun4c_get_segmap(addr) != invalid_segment) {
108 unsigned long vac_size = SUN4C_VAC_SIZE;
109
110 __asm__ __volatile__(
111 "1: addcc %0, -4096, %0\n\t"
112 " bne 1b\n\t"
113 " sta %%g0, [%2 + %0] %3"
114 : "=&r" (vac_size)
115 : "0" (vac_size), "r" (addr), "i" (ASI_HWFLUSHSEG)
116 : "cc");
117 }
118}
119
120/* File local boot time fixups. */
121BTFIXUPDEF_CALL(void, sun4c_flush_page, unsigned long)
122BTFIXUPDEF_CALL(void, sun4c_flush_segment, unsigned long)
123BTFIXUPDEF_CALL(void, sun4c_flush_context, void)
124
125#define sun4c_flush_page(addr) BTFIXUP_CALL(sun4c_flush_page)(addr)
126#define sun4c_flush_segment(addr) BTFIXUP_CALL(sun4c_flush_segment)(addr)
127#define sun4c_flush_context() BTFIXUP_CALL(sun4c_flush_context)()
128
129/* Must be called minimally with interrupts disabled. */
130static void sun4c_flush_page_hw(unsigned long addr)
131{
132 addr &= PAGE_MASK;
133 if ((int)sun4c_get_pte(addr) < 0)
134 __asm__ __volatile__("sta %%g0, [%0] %1"
135 : : "r" (addr), "i" (ASI_HWFLUSHPAGE));
136}
137
138/* Don't inline the software version as it eats too many cache lines if expanded. */
139static void sun4c_flush_context_sw(void)
140{
141 unsigned long nbytes = SUN4C_VAC_SIZE;
142 unsigned long lsize = sun4c_vacinfo.linesize;
143
144 __asm__ __volatile__(
145 "add %2, %2, %%g1\n\t"
146 "add %2, %%g1, %%g2\n\t"
147 "add %2, %%g2, %%g3\n\t"
148 "add %2, %%g3, %%g4\n\t"
149 "add %2, %%g4, %%g5\n\t"
150 "add %2, %%g5, %%o4\n\t"
151 "add %2, %%o4, %%o5\n"
152 "1:\n\t"
153 "subcc %0, %%o5, %0\n\t"
154 "sta %%g0, [%0] %3\n\t"
155 "sta %%g0, [%0 + %2] %3\n\t"
156 "sta %%g0, [%0 + %%g1] %3\n\t"
157 "sta %%g0, [%0 + %%g2] %3\n\t"
158 "sta %%g0, [%0 + %%g3] %3\n\t"
159 "sta %%g0, [%0 + %%g4] %3\n\t"
160 "sta %%g0, [%0 + %%g5] %3\n\t"
161 "bg 1b\n\t"
162 " sta %%g0, [%1 + %%o4] %3\n"
163 : "=&r" (nbytes)
164 : "0" (nbytes), "r" (lsize), "i" (ASI_FLUSHCTX)
165 : "g1", "g2", "g3", "g4", "g5", "o4", "o5", "cc");
166}
167
168/* Don't inline the software version as it eats too many cache lines if expanded. */
169static void sun4c_flush_segment_sw(unsigned long addr)
170{
171 if (sun4c_get_segmap(addr) != invalid_segment) {
172 unsigned long nbytes = SUN4C_VAC_SIZE;
173 unsigned long lsize = sun4c_vacinfo.linesize;
174
175 __asm__ __volatile__(
176 "add %2, %2, %%g1\n\t"
177 "add %2, %%g1, %%g2\n\t"
178 "add %2, %%g2, %%g3\n\t"
179 "add %2, %%g3, %%g4\n\t"
180 "add %2, %%g4, %%g5\n\t"
181 "add %2, %%g5, %%o4\n\t"
182 "add %2, %%o4, %%o5\n"
183 "1:\n\t"
184 "subcc %1, %%o5, %1\n\t"
185 "sta %%g0, [%0] %6\n\t"
186 "sta %%g0, [%0 + %2] %6\n\t"
187 "sta %%g0, [%0 + %%g1] %6\n\t"
188 "sta %%g0, [%0 + %%g2] %6\n\t"
189 "sta %%g0, [%0 + %%g3] %6\n\t"
190 "sta %%g0, [%0 + %%g4] %6\n\t"
191 "sta %%g0, [%0 + %%g5] %6\n\t"
192 "sta %%g0, [%0 + %%o4] %6\n\t"
193 "bg 1b\n\t"
194 " add %0, %%o5, %0\n"
195 : "=&r" (addr), "=&r" (nbytes), "=&r" (lsize)
196 : "0" (addr), "1" (nbytes), "2" (lsize),
197 "i" (ASI_FLUSHSEG)
198 : "g1", "g2", "g3", "g4", "g5", "o4", "o5", "cc");
199 }
200}
201
202/* Don't inline the software version as it eats too many cache lines if expanded. */
203static void sun4c_flush_page_sw(unsigned long addr)
204{
205 addr &= PAGE_MASK;
206 if ((sun4c_get_pte(addr) & (_SUN4C_PAGE_NOCACHE | _SUN4C_PAGE_VALID)) ==
207 _SUN4C_PAGE_VALID) {
208 unsigned long left = PAGE_SIZE;
209 unsigned long lsize = sun4c_vacinfo.linesize;
210
211 __asm__ __volatile__(
212 "add %2, %2, %%g1\n\t"
213 "add %2, %%g1, %%g2\n\t"
214 "add %2, %%g2, %%g3\n\t"
215 "add %2, %%g3, %%g4\n\t"
216 "add %2, %%g4, %%g5\n\t"
217 "add %2, %%g5, %%o4\n\t"
218 "add %2, %%o4, %%o5\n"
219 "1:\n\t"
220 "subcc %1, %%o5, %1\n\t"
221 "sta %%g0, [%0] %6\n\t"
222 "sta %%g0, [%0 + %2] %6\n\t"
223 "sta %%g0, [%0 + %%g1] %6\n\t"
224 "sta %%g0, [%0 + %%g2] %6\n\t"
225 "sta %%g0, [%0 + %%g3] %6\n\t"
226 "sta %%g0, [%0 + %%g4] %6\n\t"
227 "sta %%g0, [%0 + %%g5] %6\n\t"
228 "sta %%g0, [%0 + %%o4] %6\n\t"
229 "bg 1b\n\t"
230 " add %0, %%o5, %0\n"
231 : "=&r" (addr), "=&r" (left), "=&r" (lsize)
232 : "0" (addr), "1" (left), "2" (lsize),
233 "i" (ASI_FLUSHPG)
234 : "g1", "g2", "g3", "g4", "g5", "o4", "o5", "cc");
235 }
236}
237
238/* The sun4c's do have an on chip store buffer. And the way you
239 * clear them out isn't so obvious. The only way I can think of
240 * to accomplish this is to read the current context register,
241 * store the same value there, then read an external hardware
242 * register.
243 */
244void sun4c_complete_all_stores(void)
245{
246 volatile int _unused;
247
248 _unused = sun4c_get_context();
249 sun4c_set_context(_unused);
250#ifdef CONFIG_SUN_AUXIO
251 _unused = get_auxio();
252#endif
253}
254
255/* Bootup utility functions. */
256static inline void sun4c_init_clean_segmap(unsigned char pseg)
257{
258 unsigned long vaddr;
259
260 sun4c_put_segmap(0, pseg);
261 for (vaddr = 0; vaddr < SUN4C_REAL_PGDIR_SIZE; vaddr += PAGE_SIZE)
262 sun4c_put_pte(vaddr, 0);
263 sun4c_put_segmap(0, invalid_segment);
264}
265
266static inline void sun4c_init_clean_mmu(unsigned long kernel_end)
267{
268 unsigned long vaddr;
269 unsigned char savectx, ctx;
270
271 savectx = sun4c_get_context();
272 kernel_end = SUN4C_REAL_PGDIR_ALIGN(kernel_end);
273 for (ctx = 0; ctx < num_contexts; ctx++) {
274 sun4c_set_context(ctx);
275 for (vaddr = 0; vaddr < 0x20000000; vaddr += SUN4C_REAL_PGDIR_SIZE)
276 sun4c_put_segmap(vaddr, invalid_segment);
277 for (vaddr = 0xe0000000; vaddr < KERNBASE; vaddr += SUN4C_REAL_PGDIR_SIZE)
278 sun4c_put_segmap(vaddr, invalid_segment);
279 for (vaddr = kernel_end; vaddr < KADB_DEBUGGER_BEGVM; vaddr += SUN4C_REAL_PGDIR_SIZE)
280 sun4c_put_segmap(vaddr, invalid_segment);
281 for (vaddr = LINUX_OPPROM_ENDVM; vaddr; vaddr += SUN4C_REAL_PGDIR_SIZE)
282 sun4c_put_segmap(vaddr, invalid_segment);
283 }
284 sun4c_set_context(savectx);
285}
286
287void __init sun4c_probe_vac(void)
288{
289 sun4c_disable_vac();
290
291 if (ARCH_SUN4) {
292 switch (idprom->id_machtype) {
293
294 case (SM_SUN4|SM_4_110):
295 sun4c_vacinfo.type = VAC_NONE;
296 sun4c_vacinfo.num_bytes = 0;
297 sun4c_vacinfo.linesize = 0;
298 sun4c_vacinfo.do_hwflushes = 0;
299 prom_printf("No VAC. Get some bucks and buy a real computer.");
300 prom_halt();
301 break;
302
303 case (SM_SUN4|SM_4_260):
304 sun4c_vacinfo.type = VAC_WRITE_BACK;
305 sun4c_vacinfo.num_bytes = 128 * 1024;
306 sun4c_vacinfo.linesize = 16;
307 sun4c_vacinfo.do_hwflushes = 0;
308 break;
309
310 case (SM_SUN4|SM_4_330):
311 sun4c_vacinfo.type = VAC_WRITE_THROUGH;
312 sun4c_vacinfo.num_bytes = 128 * 1024;
313 sun4c_vacinfo.linesize = 16;
314 sun4c_vacinfo.do_hwflushes = 0;
315 break;
316
317 case (SM_SUN4|SM_4_470):
318 sun4c_vacinfo.type = VAC_WRITE_BACK;
319 sun4c_vacinfo.num_bytes = 128 * 1024;
320 sun4c_vacinfo.linesize = 32;
321 sun4c_vacinfo.do_hwflushes = 0;
322 break;
323
324 default:
325 prom_printf("Cannot initialize VAC - weird sun4 model idprom->id_machtype = %d", idprom->id_machtype);
326 prom_halt();
327 };
328 } else {
329 sun4c_vacinfo.type = VAC_WRITE_THROUGH;
330
331 if ((idprom->id_machtype == (SM_SUN4C | SM_4C_SS1)) ||
332 (idprom->id_machtype == (SM_SUN4C | SM_4C_SS1PLUS))) {
333 /* PROM on SS1 lacks this info, to be super safe we
334 * hard code it here since this arch is cast in stone.
335 */
336 sun4c_vacinfo.num_bytes = 65536;
337 sun4c_vacinfo.linesize = 16;
338 } else {
339 sun4c_vacinfo.num_bytes =
340 prom_getintdefault(prom_root_node, "vac-size", 65536);
341 sun4c_vacinfo.linesize =
342 prom_getintdefault(prom_root_node, "vac-linesize", 16);
343 }
344 sun4c_vacinfo.do_hwflushes =
345 prom_getintdefault(prom_root_node, "vac-hwflush", 0);
346
347 if (sun4c_vacinfo.do_hwflushes == 0)
348 sun4c_vacinfo.do_hwflushes =
349 prom_getintdefault(prom_root_node, "vac_hwflush", 0);
350
351 if (sun4c_vacinfo.num_bytes != 65536) {
352 prom_printf("WEIRD Sun4C VAC cache size, "
353 "tell sparclinux@vger.kernel.org");
354 prom_halt();
355 }
356 }
357
358 sun4c_vacinfo.num_lines =
359 (sun4c_vacinfo.num_bytes / sun4c_vacinfo.linesize);
360 switch (sun4c_vacinfo.linesize) {
361 case 16:
362 sun4c_vacinfo.log2lsize = 4;
363 break;
364 case 32:
365 sun4c_vacinfo.log2lsize = 5;
366 break;
367 default:
368 prom_printf("probe_vac: Didn't expect vac-linesize of %d, halting\n",
369 sun4c_vacinfo.linesize);
370 prom_halt();
371 };
372
373 sun4c_flush_all();
374 sun4c_enable_vac();
375}
376
377/* Patch instructions for the low level kernel fault handler. */
378extern unsigned long invalid_segment_patch1, invalid_segment_patch1_ff;
379extern unsigned long invalid_segment_patch2, invalid_segment_patch2_ff;
380extern unsigned long invalid_segment_patch1_1ff, invalid_segment_patch2_1ff;
381extern unsigned long num_context_patch1, num_context_patch1_16;
382extern unsigned long num_context_patch2_16;
383extern unsigned long vac_linesize_patch, vac_linesize_patch_32;
384extern unsigned long vac_hwflush_patch1, vac_hwflush_patch1_on;
385extern unsigned long vac_hwflush_patch2, vac_hwflush_patch2_on;
386
387#define PATCH_INSN(src, dst) do { \
388 daddr = &(dst); \
389 iaddr = &(src); \
390 *daddr = *iaddr; \
391 } while (0)
392
393static void __init patch_kernel_fault_handler(void)
394{
395 unsigned long *iaddr, *daddr;
396
397 switch (num_segmaps) {
398 case 128:
399 /* Default, nothing to do. */
400 break;
401 case 256:
402 PATCH_INSN(invalid_segment_patch1_ff,
403 invalid_segment_patch1);
404 PATCH_INSN(invalid_segment_patch2_ff,
405 invalid_segment_patch2);
406 break;
407 case 512:
408 PATCH_INSN(invalid_segment_patch1_1ff,
409 invalid_segment_patch1);
410 PATCH_INSN(invalid_segment_patch2_1ff,
411 invalid_segment_patch2);
412 break;
413 default:
414 prom_printf("Unhandled number of segmaps: %d\n",
415 num_segmaps);
416 prom_halt();
417 };
418 switch (num_contexts) {
419 case 8:
420 /* Default, nothing to do. */
421 break;
422 case 16:
423 PATCH_INSN(num_context_patch1_16,
424 num_context_patch1);
425 break;
426 default:
427 prom_printf("Unhandled number of contexts: %d\n",
428 num_contexts);
429 prom_halt();
430 };
431
432 if (sun4c_vacinfo.do_hwflushes != 0) {
433 PATCH_INSN(vac_hwflush_patch1_on, vac_hwflush_patch1);
434 PATCH_INSN(vac_hwflush_patch2_on, vac_hwflush_patch2);
435 } else {
436 switch (sun4c_vacinfo.linesize) {
437 case 16:
438 /* Default, nothing to do. */
439 break;
440 case 32:
441 PATCH_INSN(vac_linesize_patch_32, vac_linesize_patch);
442 break;
443 default:
444 prom_printf("Impossible VAC linesize %d, halting...\n",
445 sun4c_vacinfo.linesize);
446 prom_halt();
447 };
448 }
449}
450
451static void __init sun4c_probe_mmu(void)
452{
453 if (ARCH_SUN4) {
454 switch (idprom->id_machtype) {
455 case (SM_SUN4|SM_4_110):
456 prom_printf("No support for 4100 yet\n");
457 prom_halt();
458 num_segmaps = 256;
459 num_contexts = 8;
460 break;
461
462 case (SM_SUN4|SM_4_260):
463 /* should be 512 segmaps. when it get fixed */
464 num_segmaps = 256;
465 num_contexts = 16;
466 break;
467
468 case (SM_SUN4|SM_4_330):
469 num_segmaps = 256;
470 num_contexts = 16;
471 break;
472
473 case (SM_SUN4|SM_4_470):
474 /* should be 1024 segmaps. when it get fixed */
475 num_segmaps = 256;
476 num_contexts = 64;
477 break;
478 default:
479 prom_printf("Invalid SUN4 model\n");
480 prom_halt();
481 };
482 } else {
483 if ((idprom->id_machtype == (SM_SUN4C | SM_4C_SS1)) ||
484 (idprom->id_machtype == (SM_SUN4C | SM_4C_SS1PLUS))) {
485 /* Hardcode these just to be safe, PROM on SS1 does
486 * not have this info available in the root node.
487 */
488 num_segmaps = 128;
489 num_contexts = 8;
490 } else {
491 num_segmaps =
492 prom_getintdefault(prom_root_node, "mmu-npmg", 128);
493 num_contexts =
494 prom_getintdefault(prom_root_node, "mmu-nctx", 0x8);
495 }
496 }
497 patch_kernel_fault_handler();
498}
499
500volatile unsigned long *sun4c_memerr_reg = NULL;
501
502void __init sun4c_probe_memerr_reg(void)
503{
504 int node;
505 struct linux_prom_registers regs[1];
506
507 if (ARCH_SUN4) {
508 sun4c_memerr_reg = ioremap(sun4_memreg_physaddr, PAGE_SIZE);
509 } else {
510 node = prom_getchild(prom_root_node);
511 node = prom_searchsiblings(prom_root_node, "memory-error");
512 if (!node)
513 return;
514 if (prom_getproperty(node, "reg", (char *)regs, sizeof(regs)) <= 0)
515 return;
516 /* hmm I think regs[0].which_io is zero here anyways */
517 sun4c_memerr_reg = ioremap(regs[0].phys_addr, regs[0].reg_size);
518 }
519}
520
521static inline void sun4c_init_ss2_cache_bug(void)
522{
523 extern unsigned long start;
524
525 if ((idprom->id_machtype == (SM_SUN4C | SM_4C_SS2)) ||
526 (idprom->id_machtype == (SM_SUN4C | SM_4C_IPX)) ||
527 (idprom->id_machtype == (SM_SUN4 | SM_4_330)) ||
528 (idprom->id_machtype == (SM_SUN4C | SM_4C_ELC))) {
529 /* Whee.. */
530 printk("SS2 cache bug detected, uncaching trap table page\n");
531 sun4c_flush_page((unsigned int) &start);
532 sun4c_put_pte(((unsigned long) &start),
533 (sun4c_get_pte((unsigned long) &start) | _SUN4C_PAGE_NOCACHE));
534 }
535}
536
537/* Addr is always aligned on a page boundary for us already. */
538static int sun4c_map_dma_area(dma_addr_t *pba, unsigned long va,
539 unsigned long addr, int len)
540{
541 unsigned long page, end;
542
543 *pba = addr;
544
545 end = PAGE_ALIGN((addr + len));
546 while (addr < end) {
547 page = va;
548 sun4c_flush_page(page);
549 page -= PAGE_OFFSET;
550 page >>= PAGE_SHIFT;
551 page |= (_SUN4C_PAGE_VALID | _SUN4C_PAGE_DIRTY |
552 _SUN4C_PAGE_NOCACHE | _SUN4C_PAGE_PRIV);
553 sun4c_put_pte(addr, page);
554 addr += PAGE_SIZE;
555 va += PAGE_SIZE;
556 }
557
558 return 0;
559}
560
561static struct page *sun4c_translate_dvma(unsigned long busa)
562{
563 /* Fortunately for us, bus_addr == uncached_virt in sun4c. */
564 unsigned long pte = sun4c_get_pte(busa);
565 return pfn_to_page(pte & SUN4C_PFN_MASK);
566}
567
568static void sun4c_unmap_dma_area(unsigned long busa, int len)
569{
570 /* Fortunately for us, bus_addr == uncached_virt in sun4c. */
571 /* XXX Implement this */
572}
573
574/* TLB management. */
575
576/* Don't change this struct without changing entry.S. This is used
577 * in the in-window kernel fault handler, and you don't want to mess
578 * with that. (See sun4c_fault in entry.S).
579 */
580struct sun4c_mmu_entry {
581 struct sun4c_mmu_entry *next;
582 struct sun4c_mmu_entry *prev;
583 unsigned long vaddr;
584 unsigned char pseg;
585 unsigned char locked;
586
587 /* For user mappings only, and completely hidden from kernel
588 * TLB miss code.
589 */
590 unsigned char ctx;
591 struct sun4c_mmu_entry *lru_next;
592 struct sun4c_mmu_entry *lru_prev;
593};
594
595static struct sun4c_mmu_entry mmu_entry_pool[SUN4C_MAX_SEGMAPS];
596
597static void __init sun4c_init_mmu_entry_pool(void)
598{
599 int i;
600
601 for (i=0; i < SUN4C_MAX_SEGMAPS; i++) {
602 mmu_entry_pool[i].pseg = i;
603 mmu_entry_pool[i].next = NULL;
604 mmu_entry_pool[i].prev = NULL;
605 mmu_entry_pool[i].vaddr = 0;
606 mmu_entry_pool[i].locked = 0;
607 mmu_entry_pool[i].ctx = 0;
608 mmu_entry_pool[i].lru_next = NULL;
609 mmu_entry_pool[i].lru_prev = NULL;
610 }
611 mmu_entry_pool[invalid_segment].locked = 1;
612}
613
614static inline void fix_permissions(unsigned long vaddr, unsigned long bits_on,
615 unsigned long bits_off)
616{
617 unsigned long start, end;
618
619 end = vaddr + SUN4C_REAL_PGDIR_SIZE;
620 for (start = vaddr; start < end; start += PAGE_SIZE)
621 if (sun4c_get_pte(start) & _SUN4C_PAGE_VALID)
622 sun4c_put_pte(start, (sun4c_get_pte(start) | bits_on) &
623 ~bits_off);
624}
625
626static inline void sun4c_init_map_kernelprom(unsigned long kernel_end)
627{
628 unsigned long vaddr;
629 unsigned char pseg, ctx;
630#ifdef CONFIG_SUN4
631 /* sun4/110 and 260 have no kadb. */
632 if ((idprom->id_machtype != (SM_SUN4 | SM_4_260)) &&
633 (idprom->id_machtype != (SM_SUN4 | SM_4_110))) {
634#endif
635 for (vaddr = KADB_DEBUGGER_BEGVM;
636 vaddr < LINUX_OPPROM_ENDVM;
637 vaddr += SUN4C_REAL_PGDIR_SIZE) {
638 pseg = sun4c_get_segmap(vaddr);
639 if (pseg != invalid_segment) {
640 mmu_entry_pool[pseg].locked = 1;
641 for (ctx = 0; ctx < num_contexts; ctx++)
642 prom_putsegment(ctx, vaddr, pseg);
643 fix_permissions(vaddr, _SUN4C_PAGE_PRIV, 0);
644 }
645 }
646#ifdef CONFIG_SUN4
647 }
648#endif
649 for (vaddr = KERNBASE; vaddr < kernel_end; vaddr += SUN4C_REAL_PGDIR_SIZE) {
650 pseg = sun4c_get_segmap(vaddr);
651 mmu_entry_pool[pseg].locked = 1;
652 for (ctx = 0; ctx < num_contexts; ctx++)
653 prom_putsegment(ctx, vaddr, pseg);
654 fix_permissions(vaddr, _SUN4C_PAGE_PRIV, _SUN4C_PAGE_NOCACHE);
655 }
656}
657
658static void __init sun4c_init_lock_area(unsigned long start, unsigned long end)
659{
660 int i, ctx;
661
662 while (start < end) {
663 for (i = 0; i < invalid_segment; i++)
664 if (!mmu_entry_pool[i].locked)
665 break;
666 mmu_entry_pool[i].locked = 1;
667 sun4c_init_clean_segmap(i);
668 for (ctx = 0; ctx < num_contexts; ctx++)
669 prom_putsegment(ctx, start, mmu_entry_pool[i].pseg);
670 start += SUN4C_REAL_PGDIR_SIZE;
671 }
672}
673
674/* Don't change this struct without changing entry.S. This is used
675 * in the in-window kernel fault handler, and you don't want to mess
676 * with that. (See sun4c_fault in entry.S).
677 */
678struct sun4c_mmu_ring {
679 struct sun4c_mmu_entry ringhd;
680 int num_entries;
681};
682
683static struct sun4c_mmu_ring sun4c_context_ring[SUN4C_MAX_CONTEXTS]; /* used user entries */
684static struct sun4c_mmu_ring sun4c_ufree_ring; /* free user entries */
685static struct sun4c_mmu_ring sun4c_ulru_ring; /* LRU user entries */
686struct sun4c_mmu_ring sun4c_kernel_ring; /* used kernel entries */
687struct sun4c_mmu_ring sun4c_kfree_ring; /* free kernel entries */
688
689static inline void sun4c_init_rings(void)
690{
691 int i;
692
693 for (i = 0; i < SUN4C_MAX_CONTEXTS; i++) {
694 sun4c_context_ring[i].ringhd.next =
695 sun4c_context_ring[i].ringhd.prev =
696 &sun4c_context_ring[i].ringhd;
697 sun4c_context_ring[i].num_entries = 0;
698 }
699 sun4c_ufree_ring.ringhd.next = sun4c_ufree_ring.ringhd.prev =
700 &sun4c_ufree_ring.ringhd;
701 sun4c_ufree_ring.num_entries = 0;
702 sun4c_ulru_ring.ringhd.lru_next = sun4c_ulru_ring.ringhd.lru_prev =
703 &sun4c_ulru_ring.ringhd;
704 sun4c_ulru_ring.num_entries = 0;
705 sun4c_kernel_ring.ringhd.next = sun4c_kernel_ring.ringhd.prev =
706 &sun4c_kernel_ring.ringhd;
707 sun4c_kernel_ring.num_entries = 0;
708 sun4c_kfree_ring.ringhd.next = sun4c_kfree_ring.ringhd.prev =
709 &sun4c_kfree_ring.ringhd;
710 sun4c_kfree_ring.num_entries = 0;
711}
712
713static void add_ring(struct sun4c_mmu_ring *ring,
714 struct sun4c_mmu_entry *entry)
715{
716 struct sun4c_mmu_entry *head = &ring->ringhd;
717
718 entry->prev = head;
719 (entry->next = head->next)->prev = entry;
720 head->next = entry;
721 ring->num_entries++;
722}
723
724static __inline__ void add_lru(struct sun4c_mmu_entry *entry)
725{
726 struct sun4c_mmu_ring *ring = &sun4c_ulru_ring;
727 struct sun4c_mmu_entry *head = &ring->ringhd;
728
729 entry->lru_next = head;
730 (entry->lru_prev = head->lru_prev)->lru_next = entry;
731 head->lru_prev = entry;
732}
733
734static void add_ring_ordered(struct sun4c_mmu_ring *ring,
735 struct sun4c_mmu_entry *entry)
736{
737 struct sun4c_mmu_entry *head = &ring->ringhd;
738 unsigned long addr = entry->vaddr;
739
740 while ((head->next != &ring->ringhd) && (head->next->vaddr < addr))
741 head = head->next;
742
743 entry->prev = head;
744 (entry->next = head->next)->prev = entry;
745 head->next = entry;
746 ring->num_entries++;
747
748 add_lru(entry);
749}
750
751static __inline__ void remove_ring(struct sun4c_mmu_ring *ring,
752 struct sun4c_mmu_entry *entry)
753{
754 struct sun4c_mmu_entry *next = entry->next;
755
756 (next->prev = entry->prev)->next = next;
757 ring->num_entries--;
758}
759
760static void remove_lru(struct sun4c_mmu_entry *entry)
761{
762 struct sun4c_mmu_entry *next = entry->lru_next;
763
764 (next->lru_prev = entry->lru_prev)->lru_next = next;
765}
766
767static void free_user_entry(int ctx, struct sun4c_mmu_entry *entry)
768{
769 remove_ring(sun4c_context_ring+ctx, entry);
770 remove_lru(entry);
771 add_ring(&sun4c_ufree_ring, entry);
772}
773
774static void free_kernel_entry(struct sun4c_mmu_entry *entry,
775 struct sun4c_mmu_ring *ring)
776{
777 remove_ring(ring, entry);
778 add_ring(&sun4c_kfree_ring, entry);
779}
780
781static void __init sun4c_init_fill_kernel_ring(int howmany)
782{
783 int i;
784
785 while (howmany) {
786 for (i = 0; i < invalid_segment; i++)
787 if (!mmu_entry_pool[i].locked)
788 break;
789 mmu_entry_pool[i].locked = 1;
790 sun4c_init_clean_segmap(i);
791 add_ring(&sun4c_kfree_ring, &mmu_entry_pool[i]);
792 howmany--;
793 }
794}
795
796static void __init sun4c_init_fill_user_ring(void)
797{
798 int i;
799
800 for (i = 0; i < invalid_segment; i++) {
801 if (mmu_entry_pool[i].locked)
802 continue;
803 sun4c_init_clean_segmap(i);
804 add_ring(&sun4c_ufree_ring, &mmu_entry_pool[i]);
805 }
806}
807
808static void sun4c_kernel_unmap(struct sun4c_mmu_entry *kentry)
809{
810 int savectx, ctx;
811
812 savectx = sun4c_get_context();
813 for (ctx = 0; ctx < num_contexts; ctx++) {
814 sun4c_set_context(ctx);
815 sun4c_put_segmap(kentry->vaddr, invalid_segment);
816 }
817 sun4c_set_context(savectx);
818}
819
820static void sun4c_kernel_map(struct sun4c_mmu_entry *kentry)
821{
822 int savectx, ctx;
823
824 savectx = sun4c_get_context();
825 for (ctx = 0; ctx < num_contexts; ctx++) {
826 sun4c_set_context(ctx);
827 sun4c_put_segmap(kentry->vaddr, kentry->pseg);
828 }
829 sun4c_set_context(savectx);
830}
831
832#define sun4c_user_unmap(__entry) \
833 sun4c_put_segmap((__entry)->vaddr, invalid_segment)
834
835static void sun4c_demap_context(struct sun4c_mmu_ring *crp, unsigned char ctx)
836{
837 struct sun4c_mmu_entry *head = &crp->ringhd;
838 unsigned long flags;
839
840 local_irq_save(flags);
841 if (head->next != head) {
842 struct sun4c_mmu_entry *entry = head->next;
843 int savectx = sun4c_get_context();
844
845 flush_user_windows();
846 sun4c_set_context(ctx);
847 sun4c_flush_context();
848 do {
849 struct sun4c_mmu_entry *next = entry->next;
850
851 sun4c_user_unmap(entry);
852 free_user_entry(ctx, entry);
853
854 entry = next;
855 } while (entry != head);
856 sun4c_set_context(savectx);
857 }
858 local_irq_restore(flags);
859}
860
861static int sun4c_user_taken_entries; /* This is how much we have. */
862static int max_user_taken_entries; /* This limits us and prevents deadlock. */
863
864static struct sun4c_mmu_entry *sun4c_kernel_strategy(void)
865{
866 struct sun4c_mmu_entry *this_entry;
867
868 /* If some are free, return first one. */
869 if (sun4c_kfree_ring.num_entries) {
870 this_entry = sun4c_kfree_ring.ringhd.next;
871 return this_entry;
872 }
873
874 /* Else free one up. */
875 this_entry = sun4c_kernel_ring.ringhd.prev;
876 sun4c_flush_segment(this_entry->vaddr);
877 sun4c_kernel_unmap(this_entry);
878 free_kernel_entry(this_entry, &sun4c_kernel_ring);
879 this_entry = sun4c_kfree_ring.ringhd.next;
880
881 return this_entry;
882}
883
884/* Using this method to free up mmu entries eliminates a lot of
885 * potential races since we have a kernel that incurs tlb
886 * replacement faults. There may be performance penalties.
887 *
888 * NOTE: Must be called with interrupts disabled.
889 */
890static struct sun4c_mmu_entry *sun4c_user_strategy(void)
891{
892 struct sun4c_mmu_entry *entry;
893 unsigned char ctx;
894 int savectx;
895
896 /* If some are free, return first one. */
897 if (sun4c_ufree_ring.num_entries) {
898 entry = sun4c_ufree_ring.ringhd.next;
899 goto unlink_out;
900 }
901
902 if (sun4c_user_taken_entries) {
903 entry = sun4c_kernel_strategy();
904 sun4c_user_taken_entries--;
905 goto kunlink_out;
906 }
907
908 /* Grab from the beginning of the LRU list. */
909 entry = sun4c_ulru_ring.ringhd.lru_next;
910 ctx = entry->ctx;
911
912 savectx = sun4c_get_context();
913 flush_user_windows();
914 sun4c_set_context(ctx);
915 sun4c_flush_segment(entry->vaddr);
916 sun4c_user_unmap(entry);
917 remove_ring(sun4c_context_ring + ctx, entry);
918 remove_lru(entry);
919 sun4c_set_context(savectx);
920
921 return entry;
922
923unlink_out:
924 remove_ring(&sun4c_ufree_ring, entry);
925 return entry;
926kunlink_out:
927 remove_ring(&sun4c_kfree_ring, entry);
928 return entry;
929}
930
931/* NOTE: Must be called with interrupts disabled. */
932void sun4c_grow_kernel_ring(void)
933{
934 struct sun4c_mmu_entry *entry;
935
936 /* Prevent deadlock condition. */
937 if (sun4c_user_taken_entries >= max_user_taken_entries)
938 return;
939
940 if (sun4c_ufree_ring.num_entries) {
941 entry = sun4c_ufree_ring.ringhd.next;
942 remove_ring(&sun4c_ufree_ring, entry);
943 add_ring(&sun4c_kfree_ring, entry);
944 sun4c_user_taken_entries++;
945 }
946}
947
948/* 2 page buckets for task struct and kernel stack allocation.
949 *
950 * TASK_STACK_BEGIN
951 * bucket[0]
952 * bucket[1]
953 * [ ... ]
954 * bucket[NR_TASK_BUCKETS-1]
955 * TASK_STACK_BEGIN + (sizeof(struct task_bucket) * NR_TASK_BUCKETS)
956 *
957 * Each slot looks like:
958 *
959 * page 1 -- task struct + beginning of kernel stack
960 * page 2 -- rest of kernel stack
961 */
962
963union task_union *sun4c_bucket[NR_TASK_BUCKETS];
964
965static int sun4c_lowbucket_avail;
966
967#define BUCKET_EMPTY ((union task_union *) 0)
968#define BUCKET_SHIFT (PAGE_SHIFT + 1) /* log2(sizeof(struct task_bucket)) */
969#define BUCKET_SIZE (1 << BUCKET_SHIFT)
970#define BUCKET_NUM(addr) ((((addr) - SUN4C_LOCK_VADDR) >> BUCKET_SHIFT))
971#define BUCKET_ADDR(num) (((num) << BUCKET_SHIFT) + SUN4C_LOCK_VADDR)
972#define BUCKET_PTE(page) \
973 ((((page) - PAGE_OFFSET) >> PAGE_SHIFT) | pgprot_val(SUN4C_PAGE_KERNEL))
974#define BUCKET_PTE_PAGE(pte) \
975 (PAGE_OFFSET + (((pte) & SUN4C_PFN_MASK) << PAGE_SHIFT))
976
977static void get_locked_segment(unsigned long addr)
978{
979 struct sun4c_mmu_entry *stolen;
980 unsigned long flags;
981
982 local_irq_save(flags);
983 addr &= SUN4C_REAL_PGDIR_MASK;
984 stolen = sun4c_user_strategy();
985 max_user_taken_entries--;
986 stolen->vaddr = addr;
987 flush_user_windows();
988 sun4c_kernel_map(stolen);
989 local_irq_restore(flags);
990}
991
992static void free_locked_segment(unsigned long addr)
993{
994 struct sun4c_mmu_entry *entry;
995 unsigned long flags;
996 unsigned char pseg;
997
998 local_irq_save(flags);
999 addr &= SUN4C_REAL_PGDIR_MASK;
1000 pseg = sun4c_get_segmap(addr);
1001 entry = &mmu_entry_pool[pseg];
1002
1003 flush_user_windows();
1004 sun4c_flush_segment(addr);
1005 sun4c_kernel_unmap(entry);
1006 add_ring(&sun4c_ufree_ring, entry);
1007 max_user_taken_entries++;
1008 local_irq_restore(flags);
1009}
1010
1011static inline void garbage_collect(int entry)
1012{
1013 int start, end;
1014
1015 /* 32 buckets per segment... */
1016 entry &= ~31;
1017 start = entry;
1018 for (end = (start + 32); start < end; start++)
1019 if (sun4c_bucket[start] != BUCKET_EMPTY)
1020 return;
1021
1022 /* Entire segment empty, release it. */
1023 free_locked_segment(BUCKET_ADDR(entry));
1024}
1025
1026static struct thread_info *sun4c_alloc_thread_info(void)
1027{
1028 unsigned long addr, pages;
1029 int entry;
1030
1031 pages = __get_free_pages(GFP_KERNEL, THREAD_INFO_ORDER);
1032 if (!pages)
1033 return NULL;
1034
1035 for (entry = sun4c_lowbucket_avail; entry < NR_TASK_BUCKETS; entry++)
1036 if (sun4c_bucket[entry] == BUCKET_EMPTY)
1037 break;
1038 if (entry == NR_TASK_BUCKETS) {
1039 free_pages(pages, THREAD_INFO_ORDER);
1040 return NULL;
1041 }
1042 if (entry >= sun4c_lowbucket_avail)
1043 sun4c_lowbucket_avail = entry + 1;
1044
1045 addr = BUCKET_ADDR(entry);
1046 sun4c_bucket[entry] = (union task_union *) addr;
1047 if(sun4c_get_segmap(addr) == invalid_segment)
1048 get_locked_segment(addr);
1049
1050 /* We are changing the virtual color of the page(s)
1051 * so we must flush the cache to guarantee consistency.
1052 */
1053 sun4c_flush_page(pages);
1054#ifndef CONFIG_SUN4
1055 sun4c_flush_page(pages + PAGE_SIZE);
1056#endif
1057
1058 sun4c_put_pte(addr, BUCKET_PTE(pages));
1059#ifndef CONFIG_SUN4
1060 sun4c_put_pte(addr + PAGE_SIZE, BUCKET_PTE(pages + PAGE_SIZE));
1061#endif
1062
1063#ifdef CONFIG_DEBUG_STACK_USAGE
1064 memset((void *)addr, 0, PAGE_SIZE << THREAD_INFO_ORDER);
1065#endif /* DEBUG_STACK_USAGE */
1066
1067 return (struct thread_info *) addr;
1068}
1069
1070static void sun4c_free_thread_info(struct thread_info *ti)
1071{
1072 unsigned long tiaddr = (unsigned long) ti;
1073 unsigned long pages = BUCKET_PTE_PAGE(sun4c_get_pte(tiaddr));
1074 int entry = BUCKET_NUM(tiaddr);
1075
1076 /* We are deleting a mapping, so the flush here is mandatory. */
1077 sun4c_flush_page(tiaddr);
1078#ifndef CONFIG_SUN4
1079 sun4c_flush_page(tiaddr + PAGE_SIZE);
1080#endif
1081 sun4c_put_pte(tiaddr, 0);
1082#ifndef CONFIG_SUN4
1083 sun4c_put_pte(tiaddr + PAGE_SIZE, 0);
1084#endif
1085 sun4c_bucket[entry] = BUCKET_EMPTY;
1086 if (entry < sun4c_lowbucket_avail)
1087 sun4c_lowbucket_avail = entry;
1088
1089 free_pages(pages, THREAD_INFO_ORDER);
1090 garbage_collect(entry);
1091}
1092
1093static void __init sun4c_init_buckets(void)
1094{
1095 int entry;
1096
1097 if (sizeof(union thread_union) != (PAGE_SIZE << THREAD_INFO_ORDER)) {
1098 extern void thread_info_size_is_bolixed_pete(void);
1099 thread_info_size_is_bolixed_pete();
1100 }
1101
1102 for (entry = 0; entry < NR_TASK_BUCKETS; entry++)
1103 sun4c_bucket[entry] = BUCKET_EMPTY;
1104 sun4c_lowbucket_avail = 0;
1105}
1106
1107static unsigned long sun4c_iobuffer_start;
1108static unsigned long sun4c_iobuffer_end;
1109static unsigned long sun4c_iobuffer_high;
1110static unsigned long *sun4c_iobuffer_map;
1111static int iobuffer_map_size;
1112
1113/*
1114 * Alias our pages so they do not cause a trap.
1115 * Also one page may be aliased into several I/O areas and we may
1116 * finish these I/O separately.
1117 */
1118static char *sun4c_lockarea(char *vaddr, unsigned long size)
1119{
1120 unsigned long base, scan;
1121 unsigned long npages;
1122 unsigned long vpage;
1123 unsigned long pte;
1124 unsigned long apage;
1125 unsigned long high;
1126 unsigned long flags;
1127
1128 npages = (((unsigned long)vaddr & ~PAGE_MASK) +
1129 size + (PAGE_SIZE-1)) >> PAGE_SHIFT;
1130
1131 scan = 0;
1132 local_irq_save(flags);
1133 for (;;) {
1134 scan = find_next_zero_bit(sun4c_iobuffer_map,
1135 iobuffer_map_size, scan);
1136 if ((base = scan) + npages > iobuffer_map_size) goto abend;
1137 for (;;) {
1138 if (scan >= base + npages) goto found;
1139 if (test_bit(scan, sun4c_iobuffer_map)) break;
1140 scan++;
1141 }
1142 }
1143
1144found:
1145 high = ((base + npages) << PAGE_SHIFT) + sun4c_iobuffer_start;
1146 high = SUN4C_REAL_PGDIR_ALIGN(high);
1147 while (high > sun4c_iobuffer_high) {
1148 get_locked_segment(sun4c_iobuffer_high);
1149 sun4c_iobuffer_high += SUN4C_REAL_PGDIR_SIZE;
1150 }
1151
1152 vpage = ((unsigned long) vaddr) & PAGE_MASK;
1153 for (scan = base; scan < base+npages; scan++) {
1154 pte = ((vpage-PAGE_OFFSET) >> PAGE_SHIFT);
1155 pte |= pgprot_val(SUN4C_PAGE_KERNEL);
1156 pte |= _SUN4C_PAGE_NOCACHE;
1157 set_bit(scan, sun4c_iobuffer_map);
1158 apage = (scan << PAGE_SHIFT) + sun4c_iobuffer_start;
1159
1160 /* Flush original mapping so we see the right things later. */
1161 sun4c_flush_page(vpage);
1162
1163 sun4c_put_pte(apage, pte);
1164 vpage += PAGE_SIZE;
1165 }
1166 local_irq_restore(flags);
1167 return (char *) ((base << PAGE_SHIFT) + sun4c_iobuffer_start +
1168 (((unsigned long) vaddr) & ~PAGE_MASK));
1169
1170abend:
1171 local_irq_restore(flags);
1172 printk("DMA vaddr=0x%p size=%08lx\n", vaddr, size);
1173 panic("Out of iobuffer table");
1174 return NULL;
1175}
1176
1177static void sun4c_unlockarea(char *vaddr, unsigned long size)
1178{
1179 unsigned long vpage, npages;
1180 unsigned long flags;
1181 int scan, high;
1182
1183 vpage = (unsigned long)vaddr & PAGE_MASK;
1184 npages = (((unsigned long)vaddr & ~PAGE_MASK) +
1185 size + (PAGE_SIZE-1)) >> PAGE_SHIFT;
1186
1187 local_irq_save(flags);
1188 while (npages != 0) {
1189 --npages;
1190
1191 /* This mapping is marked non-cachable, no flush necessary. */
1192 sun4c_put_pte(vpage, 0);
1193 clear_bit((vpage - sun4c_iobuffer_start) >> PAGE_SHIFT,
1194 sun4c_iobuffer_map);
1195 vpage += PAGE_SIZE;
1196 }
1197
1198 /* garbage collect */
1199 scan = (sun4c_iobuffer_high - sun4c_iobuffer_start) >> PAGE_SHIFT;
1200 while (scan >= 0 && !sun4c_iobuffer_map[scan >> 5])
1201 scan -= 32;
1202 scan += 32;
1203 high = sun4c_iobuffer_start + (scan << PAGE_SHIFT);
1204 high = SUN4C_REAL_PGDIR_ALIGN(high) + SUN4C_REAL_PGDIR_SIZE;
1205 while (high < sun4c_iobuffer_high) {
1206 sun4c_iobuffer_high -= SUN4C_REAL_PGDIR_SIZE;
1207 free_locked_segment(sun4c_iobuffer_high);
1208 }
1209 local_irq_restore(flags);
1210}
1211
1212/* Note the scsi code at init time passes to here buffers
1213 * which sit on the kernel stack, those are already locked
1214 * by implication and fool the page locking code above
1215 * if passed to by mistake.
1216 */
1217static __u32 sun4c_get_scsi_one(char *bufptr, unsigned long len, struct sbus_bus *sbus)
1218{
1219 unsigned long page;
1220
1221 page = ((unsigned long)bufptr) & PAGE_MASK;
1222 if (!virt_addr_valid(page)) {
1223 sun4c_flush_page(page);
1224 return (__u32)bufptr; /* already locked */
1225 }
1226 return (__u32)sun4c_lockarea(bufptr, len);
1227}
1228
1229static void sun4c_get_scsi_sgl(struct scatterlist *sg, int sz, struct sbus_bus *sbus)
1230{
1231 while (sz != 0) {
1232 --sz;
1233 sg[sz].dvma_address = (__u32)sun4c_lockarea(page_address(sg[sz].page) + sg[sz].offset, sg[sz].length);
1234 sg[sz].dvma_length = sg[sz].length;
1235 }
1236}
1237
1238static void sun4c_release_scsi_one(__u32 bufptr, unsigned long len, struct sbus_bus *sbus)
1239{
1240 if (bufptr < sun4c_iobuffer_start)
1241 return; /* On kernel stack or similar, see above */
1242 sun4c_unlockarea((char *)bufptr, len);
1243}
1244
1245static void sun4c_release_scsi_sgl(struct scatterlist *sg, int sz, struct sbus_bus *sbus)
1246{
1247 while (sz != 0) {
1248 --sz;
1249 sun4c_unlockarea((char *)sg[sz].dvma_address, sg[sz].length);
1250 }
1251}
1252
1253#define TASK_ENTRY_SIZE BUCKET_SIZE /* see above */
1254#define LONG_ALIGN(x) (((x)+(sizeof(long))-1)&~((sizeof(long))-1))
1255
1256struct vm_area_struct sun4c_kstack_vma;
1257
1258static void __init sun4c_init_lock_areas(void)
1259{
1260 unsigned long sun4c_taskstack_start;
1261 unsigned long sun4c_taskstack_end;
1262 int bitmap_size;
1263
1264 sun4c_init_buckets();
1265 sun4c_taskstack_start = SUN4C_LOCK_VADDR;
1266 sun4c_taskstack_end = (sun4c_taskstack_start +
1267 (TASK_ENTRY_SIZE * NR_TASK_BUCKETS));
1268 if (sun4c_taskstack_end >= SUN4C_LOCK_END) {
1269 prom_printf("Too many tasks, decrease NR_TASK_BUCKETS please.\n");
1270 prom_halt();
1271 }
1272
1273 sun4c_iobuffer_start = sun4c_iobuffer_high =
1274 SUN4C_REAL_PGDIR_ALIGN(sun4c_taskstack_end);
1275 sun4c_iobuffer_end = SUN4C_LOCK_END;
1276 bitmap_size = (sun4c_iobuffer_end - sun4c_iobuffer_start) >> PAGE_SHIFT;
1277 bitmap_size = (bitmap_size + 7) >> 3;
1278 bitmap_size = LONG_ALIGN(bitmap_size);
1279 iobuffer_map_size = bitmap_size << 3;
1280 sun4c_iobuffer_map = __alloc_bootmem(bitmap_size, SMP_CACHE_BYTES, 0UL);
1281 memset((void *) sun4c_iobuffer_map, 0, bitmap_size);
1282
1283 sun4c_kstack_vma.vm_mm = &init_mm;
1284 sun4c_kstack_vma.vm_start = sun4c_taskstack_start;
1285 sun4c_kstack_vma.vm_end = sun4c_taskstack_end;
1286 sun4c_kstack_vma.vm_page_prot = PAGE_SHARED;
1287 sun4c_kstack_vma.vm_flags = VM_READ | VM_WRITE | VM_EXEC;
1288 insert_vm_struct(&init_mm, &sun4c_kstack_vma);
1289}
1290
1291/* Cache flushing on the sun4c. */
1292static void sun4c_flush_cache_all(void)
1293{
1294 unsigned long begin, end;
1295
1296 flush_user_windows();
1297 begin = (KERNBASE + SUN4C_REAL_PGDIR_SIZE);
1298 end = (begin + SUN4C_VAC_SIZE);
1299
1300 if (sun4c_vacinfo.linesize == 32) {
1301 while (begin < end) {
1302 __asm__ __volatile__(
1303 "ld [%0 + 0x00], %%g0\n\t"
1304 "ld [%0 + 0x20], %%g0\n\t"
1305 "ld [%0 + 0x40], %%g0\n\t"
1306 "ld [%0 + 0x60], %%g0\n\t"
1307 "ld [%0 + 0x80], %%g0\n\t"
1308 "ld [%0 + 0xa0], %%g0\n\t"
1309 "ld [%0 + 0xc0], %%g0\n\t"
1310 "ld [%0 + 0xe0], %%g0\n\t"
1311 "ld [%0 + 0x100], %%g0\n\t"
1312 "ld [%0 + 0x120], %%g0\n\t"
1313 "ld [%0 + 0x140], %%g0\n\t"
1314 "ld [%0 + 0x160], %%g0\n\t"
1315 "ld [%0 + 0x180], %%g0\n\t"
1316 "ld [%0 + 0x1a0], %%g0\n\t"
1317 "ld [%0 + 0x1c0], %%g0\n\t"
1318 "ld [%0 + 0x1e0], %%g0\n"
1319 : : "r" (begin));
1320 begin += 512;
1321 }
1322 } else {
1323 while (begin < end) {
1324 __asm__ __volatile__(
1325 "ld [%0 + 0x00], %%g0\n\t"
1326 "ld [%0 + 0x10], %%g0\n\t"
1327 "ld [%0 + 0x20], %%g0\n\t"
1328 "ld [%0 + 0x30], %%g0\n\t"
1329 "ld [%0 + 0x40], %%g0\n\t"
1330 "ld [%0 + 0x50], %%g0\n\t"
1331 "ld [%0 + 0x60], %%g0\n\t"
1332 "ld [%0 + 0x70], %%g0\n\t"
1333 "ld [%0 + 0x80], %%g0\n\t"
1334 "ld [%0 + 0x90], %%g0\n\t"
1335 "ld [%0 + 0xa0], %%g0\n\t"
1336 "ld [%0 + 0xb0], %%g0\n\t"
1337 "ld [%0 + 0xc0], %%g0\n\t"
1338 "ld [%0 + 0xd0], %%g0\n\t"
1339 "ld [%0 + 0xe0], %%g0\n\t"
1340 "ld [%0 + 0xf0], %%g0\n"
1341 : : "r" (begin));
1342 begin += 256;
1343 }
1344 }
1345}
1346
1347static void sun4c_flush_cache_mm(struct mm_struct *mm)
1348{
1349 int new_ctx = mm->context;
1350
1351 if (new_ctx != NO_CONTEXT) {
1352 flush_user_windows();
1353
1354 if (sun4c_context_ring[new_ctx].num_entries) {
1355 struct sun4c_mmu_entry *head = &sun4c_context_ring[new_ctx].ringhd;
1356 unsigned long flags;
1357
1358 local_irq_save(flags);
1359 if (head->next != head) {
1360 struct sun4c_mmu_entry *entry = head->next;
1361 int savectx = sun4c_get_context();
1362
1363 sun4c_set_context(new_ctx);
1364 sun4c_flush_context();
1365 do {
1366 struct sun4c_mmu_entry *next = entry->next;
1367
1368 sun4c_user_unmap(entry);
1369 free_user_entry(new_ctx, entry);
1370
1371 entry = next;
1372 } while (entry != head);
1373 sun4c_set_context(savectx);
1374 }
1375 local_irq_restore(flags);
1376 }
1377 }
1378}
1379
1380static void sun4c_flush_cache_range(struct vm_area_struct *vma, unsigned long start, unsigned long end)
1381{
1382 struct mm_struct *mm = vma->vm_mm;
1383 int new_ctx = mm->context;
1384
1385 if (new_ctx != NO_CONTEXT) {
1386 struct sun4c_mmu_entry *head = &sun4c_context_ring[new_ctx].ringhd;
1387 struct sun4c_mmu_entry *entry;
1388 unsigned long flags;
1389
1390 flush_user_windows();
1391
1392 local_irq_save(flags);
1393 /* All user segmap chains are ordered on entry->vaddr. */
1394 for (entry = head->next;
1395 (entry != head) && ((entry->vaddr+SUN4C_REAL_PGDIR_SIZE) < start);
1396 entry = entry->next)
1397 ;
1398
1399 /* Tracing various job mixtures showed that this conditional
1400 * only passes ~35% of the time for most worse case situations,
1401 * therefore we avoid all of this gross overhead ~65% of the time.
1402 */
1403 if ((entry != head) && (entry->vaddr < end)) {
1404 int octx = sun4c_get_context();
1405 sun4c_set_context(new_ctx);
1406
1407 /* At this point, always, (start >= entry->vaddr) and
1408 * (entry->vaddr < end), once the latter condition
1409 * ceases to hold, or we hit the end of the list, we
1410 * exit the loop. The ordering of all user allocated
1411 * segmaps makes this all work out so beautifully.
1412 */
1413 do {
1414 struct sun4c_mmu_entry *next = entry->next;
1415 unsigned long realend;
1416
1417 /* "realstart" is always >= entry->vaddr */
1418 realend = entry->vaddr + SUN4C_REAL_PGDIR_SIZE;
1419 if (end < realend)
1420 realend = end;
1421 if ((realend - entry->vaddr) <= (PAGE_SIZE << 3)) {
1422 unsigned long page = entry->vaddr;
1423 while (page < realend) {
1424 sun4c_flush_page(page);
1425 page += PAGE_SIZE;
1426 }
1427 } else {
1428 sun4c_flush_segment(entry->vaddr);
1429 sun4c_user_unmap(entry);
1430 free_user_entry(new_ctx, entry);
1431 }
1432 entry = next;
1433 } while ((entry != head) && (entry->vaddr < end));
1434 sun4c_set_context(octx);
1435 }
1436 local_irq_restore(flags);
1437 }
1438}
1439
1440static void sun4c_flush_cache_page(struct vm_area_struct *vma, unsigned long page)
1441{
1442 struct mm_struct *mm = vma->vm_mm;
1443 int new_ctx = mm->context;
1444
1445 /* Sun4c has no separate I/D caches so cannot optimize for non
1446 * text page flushes.
1447 */
1448 if (new_ctx != NO_CONTEXT) {
1449 int octx = sun4c_get_context();
1450 unsigned long flags;
1451
1452 flush_user_windows();
1453 local_irq_save(flags);
1454 sun4c_set_context(new_ctx);
1455 sun4c_flush_page(page);
1456 sun4c_set_context(octx);
1457 local_irq_restore(flags);
1458 }
1459}
1460
1461static void sun4c_flush_page_to_ram(unsigned long page)
1462{
1463 unsigned long flags;
1464
1465 local_irq_save(flags);
1466 sun4c_flush_page(page);
1467 local_irq_restore(flags);
1468}
1469
1470/* Sun4c cache is unified, both instructions and data live there, so
1471 * no need to flush the on-stack instructions for new signal handlers.
1472 */
1473static void sun4c_flush_sig_insns(struct mm_struct *mm, unsigned long insn_addr)
1474{
1475}
1476
1477/* TLB flushing on the sun4c. These routines count on the cache
1478 * flushing code to flush the user register windows so that we need
1479 * not do so when we get here.
1480 */
1481
1482static void sun4c_flush_tlb_all(void)
1483{
1484 struct sun4c_mmu_entry *this_entry, *next_entry;
1485 unsigned long flags;
1486 int savectx, ctx;
1487
1488 local_irq_save(flags);
1489 this_entry = sun4c_kernel_ring.ringhd.next;
1490 savectx = sun4c_get_context();
1491 flush_user_windows();
1492 while (sun4c_kernel_ring.num_entries) {
1493 next_entry = this_entry->next;
1494 sun4c_flush_segment(this_entry->vaddr);
1495 for (ctx = 0; ctx < num_contexts; ctx++) {
1496 sun4c_set_context(ctx);
1497 sun4c_put_segmap(this_entry->vaddr, invalid_segment);
1498 }
1499 free_kernel_entry(this_entry, &sun4c_kernel_ring);
1500 this_entry = next_entry;
1501 }
1502 sun4c_set_context(savectx);
1503 local_irq_restore(flags);
1504}
1505
1506static void sun4c_flush_tlb_mm(struct mm_struct *mm)
1507{
1508 int new_ctx = mm->context;
1509
1510 if (new_ctx != NO_CONTEXT) {
1511 struct sun4c_mmu_entry *head = &sun4c_context_ring[new_ctx].ringhd;
1512 unsigned long flags;
1513
1514 local_irq_save(flags);
1515 if (head->next != head) {
1516 struct sun4c_mmu_entry *entry = head->next;
1517 int savectx = sun4c_get_context();
1518
1519 sun4c_set_context(new_ctx);
1520 sun4c_flush_context();
1521 do {
1522 struct sun4c_mmu_entry *next = entry->next;
1523
1524 sun4c_user_unmap(entry);
1525 free_user_entry(new_ctx, entry);
1526
1527 entry = next;
1528 } while (entry != head);
1529 sun4c_set_context(savectx);
1530 }
1531 local_irq_restore(flags);
1532 }
1533}
1534
1535static void sun4c_flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned long end)
1536{
1537 struct mm_struct *mm = vma->vm_mm;
1538 int new_ctx = mm->context;
1539
1540 if (new_ctx != NO_CONTEXT) {
1541 struct sun4c_mmu_entry *head = &sun4c_context_ring[new_ctx].ringhd;
1542 struct sun4c_mmu_entry *entry;
1543 unsigned long flags;
1544
1545 local_irq_save(flags);
1546 /* See commentary in sun4c_flush_cache_range(). */
1547 for (entry = head->next;
1548 (entry != head) && ((entry->vaddr+SUN4C_REAL_PGDIR_SIZE) < start);
1549 entry = entry->next)
1550 ;
1551
1552 if ((entry != head) && (entry->vaddr < end)) {
1553 int octx = sun4c_get_context();
1554
1555 sun4c_set_context(new_ctx);
1556 do {
1557 struct sun4c_mmu_entry *next = entry->next;
1558
1559 sun4c_flush_segment(entry->vaddr);
1560 sun4c_user_unmap(entry);
1561 free_user_entry(new_ctx, entry);
1562
1563 entry = next;
1564 } while ((entry != head) && (entry->vaddr < end));
1565 sun4c_set_context(octx);
1566 }
1567 local_irq_restore(flags);
1568 }
1569}
1570
1571static void sun4c_flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
1572{
1573 struct mm_struct *mm = vma->vm_mm;
1574 int new_ctx = mm->context;
1575
1576 if (new_ctx != NO_CONTEXT) {
1577 int savectx = sun4c_get_context();
1578 unsigned long flags;
1579
1580 local_irq_save(flags);
1581 sun4c_set_context(new_ctx);
1582 page &= PAGE_MASK;
1583 sun4c_flush_page(page);
1584 sun4c_put_pte(page, 0);
1585 sun4c_set_context(savectx);
1586 local_irq_restore(flags);
1587 }
1588}
1589
1590static inline void sun4c_mapioaddr(unsigned long physaddr, unsigned long virt_addr)
1591{
1592 unsigned long page_entry;
1593
1594 page_entry = ((physaddr >> PAGE_SHIFT) & SUN4C_PFN_MASK);
1595 page_entry |= ((pg_iobits | _SUN4C_PAGE_PRIV) & ~(_SUN4C_PAGE_PRESENT));
1596 sun4c_put_pte(virt_addr, page_entry);
1597}
1598
1599static void sun4c_mapiorange(unsigned int bus, unsigned long xpa,
1600 unsigned long xva, unsigned int len)
1601{
1602 while (len != 0) {
1603 len -= PAGE_SIZE;
1604 sun4c_mapioaddr(xpa, xva);
1605 xva += PAGE_SIZE;
1606 xpa += PAGE_SIZE;
1607 }
1608}
1609
1610static void sun4c_unmapiorange(unsigned long virt_addr, unsigned int len)
1611{
1612 while (len != 0) {
1613 len -= PAGE_SIZE;
1614 sun4c_put_pte(virt_addr, 0);
1615 virt_addr += PAGE_SIZE;
1616 }
1617}
1618
1619static void sun4c_alloc_context(struct mm_struct *old_mm, struct mm_struct *mm)
1620{
1621 struct ctx_list *ctxp;
1622
1623 ctxp = ctx_free.next;
1624 if (ctxp != &ctx_free) {
1625 remove_from_ctx_list(ctxp);
1626 add_to_used_ctxlist(ctxp);
1627 mm->context = ctxp->ctx_number;
1628 ctxp->ctx_mm = mm;
1629 return;
1630 }
1631 ctxp = ctx_used.next;
1632 if (ctxp->ctx_mm == old_mm)
1633 ctxp = ctxp->next;
1634 remove_from_ctx_list(ctxp);
1635 add_to_used_ctxlist(ctxp);
1636 ctxp->ctx_mm->context = NO_CONTEXT;
1637 ctxp->ctx_mm = mm;
1638 mm->context = ctxp->ctx_number;
1639 sun4c_demap_context(&sun4c_context_ring[ctxp->ctx_number],
1640 ctxp->ctx_number);
1641}
1642
1643/* Switch the current MM context. */
1644static void sun4c_switch_mm(struct mm_struct *old_mm, struct mm_struct *mm, struct task_struct *tsk, int cpu)
1645{
1646 struct ctx_list *ctx;
1647 int dirty = 0;
1648
1649 if (mm->context == NO_CONTEXT) {
1650 dirty = 1;
1651 sun4c_alloc_context(old_mm, mm);
1652 } else {
1653 /* Update the LRU ring of contexts. */
1654 ctx = ctx_list_pool + mm->context;
1655 remove_from_ctx_list(ctx);
1656 add_to_used_ctxlist(ctx);
1657 }
1658 if (dirty || old_mm != mm)
1659 sun4c_set_context(mm->context);
1660}
1661
1662static void sun4c_destroy_context(struct mm_struct *mm)
1663{
1664 struct ctx_list *ctx_old;
1665
1666 if (mm->context != NO_CONTEXT) {
1667 sun4c_demap_context(&sun4c_context_ring[mm->context], mm->context);
1668 ctx_old = ctx_list_pool + mm->context;
1669 remove_from_ctx_list(ctx_old);
1670 add_to_free_ctxlist(ctx_old);
1671 mm->context = NO_CONTEXT;
1672 }
1673}
1674
1675static void sun4c_mmu_info(struct seq_file *m)
1676{
1677 int used_user_entries, i;
1678
1679 used_user_entries = 0;
1680 for (i = 0; i < num_contexts; i++)
1681 used_user_entries += sun4c_context_ring[i].num_entries;
1682
1683 seq_printf(m,
1684 "vacsize\t\t: %d bytes\n"
1685 "vachwflush\t: %s\n"
1686 "vaclinesize\t: %d bytes\n"
1687 "mmuctxs\t\t: %d\n"
1688 "mmupsegs\t: %d\n"
1689 "kernelpsegs\t: %d\n"
1690 "kfreepsegs\t: %d\n"
1691 "usedpsegs\t: %d\n"
1692 "ufreepsegs\t: %d\n"
1693 "user_taken\t: %d\n"
1694 "max_taken\t: %d\n",
1695 sun4c_vacinfo.num_bytes,
1696 (sun4c_vacinfo.do_hwflushes ? "yes" : "no"),
1697 sun4c_vacinfo.linesize,
1698 num_contexts,
1699 (invalid_segment + 1),
1700 sun4c_kernel_ring.num_entries,
1701 sun4c_kfree_ring.num_entries,
1702 used_user_entries,
1703 sun4c_ufree_ring.num_entries,
1704 sun4c_user_taken_entries,
1705 max_user_taken_entries);
1706}
1707
1708/* Nothing below here should touch the mmu hardware nor the mmu_entry
1709 * data structures.
1710 */
1711
1712/* First the functions which the mid-level code uses to directly
1713 * manipulate the software page tables. Some defines since we are
1714 * emulating the i386 page directory layout.
1715 */
1716#define PGD_PRESENT 0x001
1717#define PGD_RW 0x002
1718#define PGD_USER 0x004
1719#define PGD_ACCESSED 0x020
1720#define PGD_DIRTY 0x040
1721#define PGD_TABLE (PGD_PRESENT | PGD_RW | PGD_USER | PGD_ACCESSED | PGD_DIRTY)
1722
1723static void sun4c_set_pte(pte_t *ptep, pte_t pte)
1724{
1725 *ptep = pte;
1726}
1727
1728static void sun4c_pgd_set(pgd_t * pgdp, pmd_t * pmdp)
1729{
1730}
1731
1732static void sun4c_pmd_set(pmd_t * pmdp, pte_t * ptep)
1733{
1734 pmdp->pmdv[0] = PGD_TABLE | (unsigned long) ptep;
1735}
1736
1737static void sun4c_pmd_populate(pmd_t * pmdp, struct page * ptep)
1738{
1739 if (page_address(ptep) == NULL) BUG(); /* No highmem on sun4c */
1740 pmdp->pmdv[0] = PGD_TABLE | (unsigned long) page_address(ptep);
1741}
1742
1743static int sun4c_pte_present(pte_t pte)
1744{
1745 return ((pte_val(pte) & (_SUN4C_PAGE_PRESENT | _SUN4C_PAGE_PRIV)) != 0);
1746}
1747static void sun4c_pte_clear(pte_t *ptep) { *ptep = __pte(0); }
1748
1749static int sun4c_pte_read(pte_t pte)
1750{
1751 return (pte_val(pte) & _SUN4C_PAGE_READ);
1752}
1753
1754static int sun4c_pmd_bad(pmd_t pmd)
1755{
1756 return (((pmd_val(pmd) & ~PAGE_MASK) != PGD_TABLE) ||
1757 (!virt_addr_valid(pmd_val(pmd))));
1758}
1759
1760static int sun4c_pmd_present(pmd_t pmd)
1761{
1762 return ((pmd_val(pmd) & PGD_PRESENT) != 0);
1763}
1764
1765#if 0 /* if PMD takes one word */
1766static void sun4c_pmd_clear(pmd_t *pmdp) { *pmdp = __pmd(0); }
1767#else /* if pmd_t is a longish aggregate */
1768static void sun4c_pmd_clear(pmd_t *pmdp) {
1769 memset((void *)pmdp, 0, sizeof(pmd_t));
1770}
1771#endif
1772
1773static int sun4c_pgd_none(pgd_t pgd) { return 0; }
1774static int sun4c_pgd_bad(pgd_t pgd) { return 0; }
1775static int sun4c_pgd_present(pgd_t pgd) { return 1; }
1776static void sun4c_pgd_clear(pgd_t * pgdp) { }
1777
1778/*
1779 * The following only work if pte_present() is true.
1780 * Undefined behaviour if not..
1781 */
1782static pte_t sun4c_pte_mkwrite(pte_t pte)
1783{
1784 pte = __pte(pte_val(pte) | _SUN4C_PAGE_WRITE);
1785 if (pte_val(pte) & _SUN4C_PAGE_MODIFIED)
1786 pte = __pte(pte_val(pte) | _SUN4C_PAGE_SILENT_WRITE);
1787 return pte;
1788}
1789
1790static pte_t sun4c_pte_mkdirty(pte_t pte)
1791{
1792 pte = __pte(pte_val(pte) | _SUN4C_PAGE_MODIFIED);
1793 if (pte_val(pte) & _SUN4C_PAGE_WRITE)
1794 pte = __pte(pte_val(pte) | _SUN4C_PAGE_SILENT_WRITE);
1795 return pte;
1796}
1797
1798static pte_t sun4c_pte_mkyoung(pte_t pte)
1799{
1800 pte = __pte(pte_val(pte) | _SUN4C_PAGE_ACCESSED);
1801 if (pte_val(pte) & _SUN4C_PAGE_READ)
1802 pte = __pte(pte_val(pte) | _SUN4C_PAGE_SILENT_READ);
1803 return pte;
1804}
1805
1806/*
1807 * Conversion functions: convert a page and protection to a page entry,
1808 * and a page entry and page directory to the page they refer to.
1809 */
1810static pte_t sun4c_mk_pte(struct page *page, pgprot_t pgprot)
1811{
1812 return __pte(page_to_pfn(page) | pgprot_val(pgprot));
1813}
1814
1815static pte_t sun4c_mk_pte_phys(unsigned long phys_page, pgprot_t pgprot)
1816{
1817 return __pte((phys_page >> PAGE_SHIFT) | pgprot_val(pgprot));
1818}
1819
1820static pte_t sun4c_mk_pte_io(unsigned long page, pgprot_t pgprot, int space)
1821{
1822 return __pte(((page - PAGE_OFFSET) >> PAGE_SHIFT) | pgprot_val(pgprot));
1823}
1824
1825static unsigned long sun4c_pte_pfn(pte_t pte)
1826{
1827 return pte_val(pte) & SUN4C_PFN_MASK;
1828}
1829
1830static pte_t sun4c_pgoff_to_pte(unsigned long pgoff)
1831{
1832 return __pte(pgoff | _SUN4C_PAGE_FILE);
1833}
1834
1835static unsigned long sun4c_pte_to_pgoff(pte_t pte)
1836{
1837 return pte_val(pte) & ((1UL << PTE_FILE_MAX_BITS) - 1);
1838}
1839
1840
1841static __inline__ unsigned long sun4c_pmd_page_v(pmd_t pmd)
1842{
1843 return (pmd_val(pmd) & PAGE_MASK);
1844}
1845
1846static struct page *sun4c_pmd_page(pmd_t pmd)
1847{
1848 return virt_to_page(sun4c_pmd_page_v(pmd));
1849}
1850
1851static unsigned long sun4c_pgd_page(pgd_t pgd) { return 0; }
1852
1853/* to find an entry in a page-table-directory */
1854static inline pgd_t *sun4c_pgd_offset(struct mm_struct * mm, unsigned long address)
1855{
1856 return mm->pgd + (address >> SUN4C_PGDIR_SHIFT);
1857}
1858
1859/* Find an entry in the second-level page table.. */
1860static pmd_t *sun4c_pmd_offset(pgd_t * dir, unsigned long address)
1861{
1862 return (pmd_t *) dir;
1863}
1864
1865/* Find an entry in the third-level page table.. */
1866pte_t *sun4c_pte_offset_kernel(pmd_t * dir, unsigned long address)
1867{
1868 return (pte_t *) sun4c_pmd_page_v(*dir) +
1869 ((address >> PAGE_SHIFT) & (SUN4C_PTRS_PER_PTE - 1));
1870}
1871
1872static unsigned long sun4c_swp_type(swp_entry_t entry)
1873{
1874 return (entry.val & SUN4C_SWP_TYPE_MASK);
1875}
1876
1877static unsigned long sun4c_swp_offset(swp_entry_t entry)
1878{
1879 return (entry.val >> SUN4C_SWP_OFF_SHIFT) & SUN4C_SWP_OFF_MASK;
1880}
1881
1882static swp_entry_t sun4c_swp_entry(unsigned long type, unsigned long offset)
1883{
1884 return (swp_entry_t) {
1885 (offset & SUN4C_SWP_OFF_MASK) << SUN4C_SWP_OFF_SHIFT
1886 | (type & SUN4C_SWP_TYPE_MASK) };
1887}
1888
1889static void sun4c_free_pte_slow(pte_t *pte)
1890{
1891 free_page((unsigned long)pte);
1892}
1893
1894static void sun4c_free_pgd_slow(pgd_t *pgd)
1895{
1896 free_page((unsigned long)pgd);
1897}
1898
1899static pgd_t *sun4c_get_pgd_fast(void)
1900{
1901 unsigned long *ret;
1902
1903 if ((ret = pgd_quicklist) != NULL) {
1904 pgd_quicklist = (unsigned long *)(*ret);
1905 ret[0] = ret[1];
1906 pgtable_cache_size--;
1907 } else {
1908 pgd_t *init;
1909
1910 ret = (unsigned long *)__get_free_page(GFP_KERNEL);
1911 memset (ret, 0, (KERNBASE / SUN4C_PGDIR_SIZE) * sizeof(pgd_t));
1912 init = sun4c_pgd_offset(&init_mm, 0);
1913 memcpy (((pgd_t *)ret) + USER_PTRS_PER_PGD, init + USER_PTRS_PER_PGD,
1914 (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
1915 }
1916 return (pgd_t *)ret;
1917}
1918
1919static void sun4c_free_pgd_fast(pgd_t *pgd)
1920{
1921 *(unsigned long *)pgd = (unsigned long) pgd_quicklist;
1922 pgd_quicklist = (unsigned long *) pgd;
1923 pgtable_cache_size++;
1924}
1925
1926
1927static __inline__ pte_t *
1928sun4c_pte_alloc_one_fast(struct mm_struct *mm, unsigned long address)
1929{
1930 unsigned long *ret;
1931
1932 if ((ret = (unsigned long *)pte_quicklist) != NULL) {
1933 pte_quicklist = (unsigned long *)(*ret);
1934 ret[0] = ret[1];
1935 pgtable_cache_size--;
1936 }
1937 return (pte_t *)ret;
1938}
1939
1940static pte_t *sun4c_pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)
1941{
1942 pte_t *pte;
1943
1944 if ((pte = sun4c_pte_alloc_one_fast(mm, address)) != NULL)
1945 return pte;
1946
1947 pte = (pte_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT);
1948 if (pte)
1949 memset(pte, 0, PAGE_SIZE);
1950 return pte;
1951}
1952
1953static struct page *sun4c_pte_alloc_one(struct mm_struct *mm, unsigned long address)
1954{
1955 pte_t *pte = sun4c_pte_alloc_one_kernel(mm, address);
1956 if (pte == NULL)
1957 return NULL;
1958 return virt_to_page(pte);
1959}
1960
1961static __inline__ void sun4c_free_pte_fast(pte_t *pte)
1962{
1963 *(unsigned long *)pte = (unsigned long) pte_quicklist;
1964 pte_quicklist = (unsigned long *) pte;
1965 pgtable_cache_size++;
1966}
1967
1968static void sun4c_pte_free(struct page *pte)
1969{
1970 sun4c_free_pte_fast(page_address(pte));
1971}
1972
1973/*
1974 * allocating and freeing a pmd is trivial: the 1-entry pmd is
1975 * inside the pgd, so has no extra memory associated with it.
1976 */
1977static pmd_t *sun4c_pmd_alloc_one(struct mm_struct *mm, unsigned long address)
1978{
1979 BUG();
1980 return NULL;
1981}
1982
1983static void sun4c_free_pmd_fast(pmd_t * pmd) { }
1984
1985static void sun4c_check_pgt_cache(int low, int high)
1986{
1987 if (pgtable_cache_size > high) {
1988 do {
1989 if (pgd_quicklist)
1990 sun4c_free_pgd_slow(sun4c_get_pgd_fast());
1991 if (pte_quicklist)
1992 sun4c_free_pte_slow(sun4c_pte_alloc_one_fast(NULL, 0));
1993 } while (pgtable_cache_size > low);
1994 }
1995}
1996
1997/* An experiment, turn off by default for now... -DaveM */
1998#define SUN4C_PRELOAD_PSEG
1999
2000void sun4c_update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t pte)
2001{
2002 unsigned long flags;
2003 int pseg;
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
2054extern void sparc_context_init(int);
2055extern unsigned long end;
2056extern unsigned long bootmem_init(unsigned long *pages_avail);
2057extern unsigned long last_valid_pfn;
2058
2059void __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_SIZE * 4);
2068 kernel_end = SUN4C_REAL_PGDIR_ALIGN(kernel_end);
2069
2070 pages_avail = 0;
2071 last_valid_pfn = bootmem_init(&pages_avail);
2072 end_pfn = last_valid_pfn;
2073
2074 sun4c_probe_mmu();
2075 invalid_segment = (num_segmaps - 1);
2076 sun4c_init_mmu_entry_pool();
2077 sun4c_init_rings();
2078 sun4c_init_map_kernelprom(kernel_end);
2079 sun4c_init_clean_mmu(kernel_end);
2080 sun4c_init_fill_kernel_ring(SUN4C_KERNEL_BUCKETS);
2081 sun4c_init_lock_area(sparc_iomap.start, IOBASE_END);
2082 sun4c_init_lock_area(DVMA_VADDR, DVMA_END);
2083 sun4c_init_lock_areas();
2084 sun4c_init_fill_user_ring();
2085
2086 sun4c_set_context(0);
2087 memset(swapper_pg_dir, 0, PAGE_SIZE);
2088 memset(pg0, 0, PAGE_SIZE);
2089 memset(pg1, 0, PAGE_SIZE);
2090 memset(pg2, 0, PAGE_SIZE);
2091 memset(pg3, 0, PAGE_SIZE);
2092
2093 /* Save work later. */
2094 vaddr = VMALLOC_START;
2095 swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg0);
2096 vaddr += SUN4C_PGDIR_SIZE;
2097 swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg1);
2098 vaddr += SUN4C_PGDIR_SIZE;
2099 swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg2);
2100 vaddr += SUN4C_PGDIR_SIZE;
2101 swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg3);
2102 sun4c_init_ss2_cache_bug();
2103 sparc_context_init(num_contexts);
2104
2105 {
2106 unsigned long zones_size[MAX_NR_ZONES];
2107 unsigned long zholes_size[MAX_NR_ZONES];
2108 unsigned long npages;
2109 int znum;
2110
2111 for (znum = 0; znum < MAX_NR_ZONES; znum++)
2112 zones_size[znum] = zholes_size[znum] = 0;
2113
2114 npages = max_low_pfn - pfn_base;
2115
2116 zones_size[ZONE_DMA] = npages;
2117 zholes_size[ZONE_DMA] = npages - pages_avail;
2118
2119 npages = highend_pfn - max_low_pfn;
2120 zones_size[ZONE_HIGHMEM] = npages;
2121 zholes_size[ZONE_HIGHMEM] = npages - calc_highpages();
2122
2123 free_area_init_node(0, &contig_page_data, zones_size,
2124 pfn_base, zholes_size);
2125 }
2126
2127 cnt = 0;
2128 for (i = 0; i < num_segmaps; i++)
2129 if (mmu_entry_pool[i].locked)
2130 cnt++;
2131
2132 max_user_taken_entries = num_segmaps - cnt - 40 - 1;
2133
2134 printk("SUN4C: %d mmu entries for the kernel\n", cnt);
2135}
2136
2137/* Load up routines and constants for sun4c mmu */
2138void __init ld_mmu_sun4c(void)
2139{
2140 extern void ___xchg32_sun4c(void);
2141
2142 printk("Loading sun4c MMU routines\n");
2143
2144 /* First the constants */
2145 BTFIXUPSET_SIMM13(pgdir_shift, SUN4C_PGDIR_SHIFT);
2146 BTFIXUPSET_SETHI(pgdir_size, SUN4C_PGDIR_SIZE);
2147 BTFIXUPSET_SETHI(pgdir_mask, SUN4C_PGDIR_MASK);
2148
2149 BTFIXUPSET_SIMM13(ptrs_per_pmd, SUN4C_PTRS_PER_PMD);
2150 BTFIXUPSET_SIMM13(ptrs_per_pgd, SUN4C_PTRS_PER_PGD);
2151 BTFIXUPSET_SIMM13(user_ptrs_per_pgd, KERNBASE / SUN4C_PGDIR_SIZE);
2152
2153 BTFIXUPSET_INT(page_none, pgprot_val(SUN4C_PAGE_NONE));
2154 BTFIXUPSET_INT(page_shared, pgprot_val(SUN4C_PAGE_SHARED));
2155 BTFIXUPSET_INT(page_copy, pgprot_val(SUN4C_PAGE_COPY));
2156 BTFIXUPSET_INT(page_readonly, pgprot_val(SUN4C_PAGE_READONLY));
2157 BTFIXUPSET_INT(page_kernel, pgprot_val(SUN4C_PAGE_KERNEL));
2158 page_kernel = pgprot_val(SUN4C_PAGE_KERNEL);
2159 pg_iobits = _SUN4C_PAGE_PRESENT | _SUN4C_READABLE | _SUN4C_WRITEABLE |
2160 _SUN4C_PAGE_IO | _SUN4C_PAGE_NOCACHE;
2161
2162 /* Functions */
2163 BTFIXUPSET_CALL(___xchg32, ___xchg32_sun4c, BTFIXUPCALL_NORM);
2164 BTFIXUPSET_CALL(do_check_pgt_cache, sun4c_check_pgt_cache, BTFIXUPCALL_NORM);
2165
2166 BTFIXUPSET_CALL(flush_cache_all, sun4c_flush_cache_all, BTFIXUPCALL_NORM);
2167
2168 if (sun4c_vacinfo.do_hwflushes) {
2169 BTFIXUPSET_CALL(sun4c_flush_page, sun4c_flush_page_hw, BTFIXUPCALL_NORM);
2170 BTFIXUPSET_CALL(sun4c_flush_segment, sun4c_flush_segment_hw, BTFIXUPCALL_NORM);
2171 BTFIXUPSET_CALL(sun4c_flush_context, sun4c_flush_context_hw, BTFIXUPCALL_NORM);
2172 } else {
2173 BTFIXUPSET_CALL(sun4c_flush_page, sun4c_flush_page_sw, BTFIXUPCALL_NORM);
2174 BTFIXUPSET_CALL(sun4c_flush_segment, sun4c_flush_segment_sw, BTFIXUPCALL_NORM);
2175 BTFIXUPSET_CALL(sun4c_flush_context, sun4c_flush_context_sw, BTFIXUPCALL_NORM);
2176 }
2177
2178 BTFIXUPSET_CALL(flush_tlb_mm, sun4c_flush_tlb_mm, BTFIXUPCALL_NORM);
2179 BTFIXUPSET_CALL(flush_cache_mm, sun4c_flush_cache_mm, BTFIXUPCALL_NORM);
2180 BTFIXUPSET_CALL(destroy_context, sun4c_destroy_context, BTFIXUPCALL_NORM);
2181 BTFIXUPSET_CALL(switch_mm, sun4c_switch_mm, BTFIXUPCALL_NORM);
2182 BTFIXUPSET_CALL(flush_cache_page, sun4c_flush_cache_page, BTFIXUPCALL_NORM);
2183 BTFIXUPSET_CALL(flush_tlb_page, sun4c_flush_tlb_page, BTFIXUPCALL_NORM);
2184 BTFIXUPSET_CALL(flush_tlb_range, sun4c_flush_tlb_range, BTFIXUPCALL_NORM);
2185 BTFIXUPSET_CALL(flush_cache_range, sun4c_flush_cache_range, BTFIXUPCALL_NORM);
2186 BTFIXUPSET_CALL(__flush_page_to_ram, sun4c_flush_page_to_ram, BTFIXUPCALL_NORM);
2187 BTFIXUPSET_CALL(flush_tlb_all, sun4c_flush_tlb_all, BTFIXUPCALL_NORM);
2188
2189 BTFIXUPSET_CALL(flush_sig_insns, sun4c_flush_sig_insns, BTFIXUPCALL_NOP);
2190
2191 BTFIXUPSET_CALL(set_pte, sun4c_set_pte, BTFIXUPCALL_STO1O0);
2192
2193 /* The 2.4.18 code does not set this on sun4c, how does it work? XXX */
2194 /* BTFIXUPSET_SETHI(none_mask, 0x00000000); */ /* Defaults to zero? */
2195
2196 BTFIXUPSET_CALL(pte_pfn, sun4c_pte_pfn, BTFIXUPCALL_NORM);
2197#if 0 /* PAGE_SHIFT <= 12 */ /* Eek. Investigate. XXX */
2198 BTFIXUPSET_CALL(pmd_page, sun4c_pmd_page, BTFIXUPCALL_ANDNINT(PAGE_SIZE - 1));
2199#else
2200 BTFIXUPSET_CALL(pmd_page, sun4c_pmd_page, BTFIXUPCALL_NORM);
2201#endif
2202 BTFIXUPSET_CALL(pmd_set, sun4c_pmd_set, BTFIXUPCALL_NORM);
2203 BTFIXUPSET_CALL(pmd_populate, sun4c_pmd_populate, BTFIXUPCALL_NORM);
2204
2205 BTFIXUPSET_CALL(pte_present, sun4c_pte_present, BTFIXUPCALL_NORM);
2206 BTFIXUPSET_CALL(pte_clear, sun4c_pte_clear, BTFIXUPCALL_STG0O0);
2207 BTFIXUPSET_CALL(pte_read, sun4c_pte_read, BTFIXUPCALL_NORM);
2208
2209 BTFIXUPSET_CALL(pmd_bad, sun4c_pmd_bad, BTFIXUPCALL_NORM);
2210 BTFIXUPSET_CALL(pmd_present, sun4c_pmd_present, BTFIXUPCALL_NORM);
2211 BTFIXUPSET_CALL(pmd_clear, sun4c_pmd_clear, BTFIXUPCALL_STG0O0);
2212
2213 BTFIXUPSET_CALL(pgd_none, sun4c_pgd_none, BTFIXUPCALL_RETINT(0));
2214 BTFIXUPSET_CALL(pgd_bad, sun4c_pgd_bad, BTFIXUPCALL_RETINT(0));
2215 BTFIXUPSET_CALL(pgd_present, sun4c_pgd_present, BTFIXUPCALL_RETINT(1));
2216 BTFIXUPSET_CALL(pgd_clear, sun4c_pgd_clear, BTFIXUPCALL_NOP);
2217
2218 BTFIXUPSET_CALL(mk_pte, sun4c_mk_pte, BTFIXUPCALL_NORM);
2219 BTFIXUPSET_CALL(mk_pte_phys, sun4c_mk_pte_phys, BTFIXUPCALL_NORM);
2220 BTFIXUPSET_CALL(mk_pte_io, sun4c_mk_pte_io, BTFIXUPCALL_NORM);
2221
2222 BTFIXUPSET_INT(pte_modify_mask, _SUN4C_PAGE_CHG_MASK);
2223 BTFIXUPSET_CALL(pmd_offset, sun4c_pmd_offset, BTFIXUPCALL_NORM);
2224 BTFIXUPSET_CALL(pte_offset_kernel, sun4c_pte_offset_kernel, BTFIXUPCALL_NORM);
2225 BTFIXUPSET_CALL(free_pte_fast, sun4c_free_pte_fast, BTFIXUPCALL_NORM);
2226 BTFIXUPSET_CALL(pte_free, sun4c_pte_free, BTFIXUPCALL_NORM);
2227 BTFIXUPSET_CALL(pte_alloc_one_kernel, sun4c_pte_alloc_one_kernel, BTFIXUPCALL_NORM);
2228 BTFIXUPSET_CALL(pte_alloc_one, sun4c_pte_alloc_one, BTFIXUPCALL_NORM);
2229 BTFIXUPSET_CALL(free_pmd_fast, sun4c_free_pmd_fast, BTFIXUPCALL_NOP);
2230 BTFIXUPSET_CALL(pmd_alloc_one, sun4c_pmd_alloc_one, BTFIXUPCALL_RETO0);
2231 BTFIXUPSET_CALL(free_pgd_fast, sun4c_free_pgd_fast, BTFIXUPCALL_NORM);
2232 BTFIXUPSET_CALL(get_pgd_fast, sun4c_get_pgd_fast, BTFIXUPCALL_NORM);
2233
2234 BTFIXUPSET_HALF(pte_writei, _SUN4C_PAGE_WRITE);
2235 BTFIXUPSET_HALF(pte_dirtyi, _SUN4C_PAGE_MODIFIED);
2236 BTFIXUPSET_HALF(pte_youngi, _SUN4C_PAGE_ACCESSED);
2237 BTFIXUPSET_HALF(pte_filei, _SUN4C_PAGE_FILE);
2238 BTFIXUPSET_HALF(pte_wrprotecti, _SUN4C_PAGE_WRITE|_SUN4C_PAGE_SILENT_WRITE);
2239 BTFIXUPSET_HALF(pte_mkcleani, _SUN4C_PAGE_MODIFIED|_SUN4C_PAGE_SILENT_WRITE);
2240 BTFIXUPSET_HALF(pte_mkoldi, _SUN4C_PAGE_ACCESSED|_SUN4C_PAGE_SILENT_READ);
2241 BTFIXUPSET_CALL(pte_mkwrite, sun4c_pte_mkwrite, BTFIXUPCALL_NORM);
2242 BTFIXUPSET_CALL(pte_mkdirty, sun4c_pte_mkdirty, BTFIXUPCALL_NORM);
2243 BTFIXUPSET_CALL(pte_mkyoung, sun4c_pte_mkyoung, BTFIXUPCALL_NORM);
2244 BTFIXUPSET_CALL(update_mmu_cache, sun4c_update_mmu_cache, BTFIXUPCALL_NORM);
2245
2246 BTFIXUPSET_CALL(pte_to_pgoff, sun4c_pte_to_pgoff, BTFIXUPCALL_NORM);
2247 BTFIXUPSET_CALL(pgoff_to_pte, sun4c_pgoff_to_pte, BTFIXUPCALL_NORM);
2248
2249 BTFIXUPSET_CALL(mmu_lockarea, sun4c_lockarea, BTFIXUPCALL_NORM);
2250 BTFIXUPSET_CALL(mmu_unlockarea, sun4c_unlockarea, BTFIXUPCALL_NORM);
2251
2252 BTFIXUPSET_CALL(mmu_get_scsi_one, sun4c_get_scsi_one, BTFIXUPCALL_NORM);
2253 BTFIXUPSET_CALL(mmu_get_scsi_sgl, sun4c_get_scsi_sgl, BTFIXUPCALL_NORM);
2254 BTFIXUPSET_CALL(mmu_release_scsi_one, sun4c_release_scsi_one, BTFIXUPCALL_NORM);
2255 BTFIXUPSET_CALL(mmu_release_scsi_sgl, sun4c_release_scsi_sgl, BTFIXUPCALL_NORM);
2256
2257 BTFIXUPSET_CALL(mmu_map_dma_area, sun4c_map_dma_area, BTFIXUPCALL_NORM);
2258 BTFIXUPSET_CALL(mmu_unmap_dma_area, sun4c_unmap_dma_area, BTFIXUPCALL_NORM);
2259 BTFIXUPSET_CALL(mmu_translate_dvma, sun4c_translate_dvma, BTFIXUPCALL_NORM);
2260
2261 BTFIXUPSET_CALL(sparc_mapiorange, sun4c_mapiorange, BTFIXUPCALL_NORM);
2262 BTFIXUPSET_CALL(sparc_unmapiorange, sun4c_unmapiorange, BTFIXUPCALL_NORM);
2263
2264 BTFIXUPSET_CALL(__swp_type, sun4c_swp_type, BTFIXUPCALL_NORM);
2265 BTFIXUPSET_CALL(__swp_offset, sun4c_swp_offset, BTFIXUPCALL_NORM);
2266 BTFIXUPSET_CALL(__swp_entry, sun4c_swp_entry, BTFIXUPCALL_NORM);
2267
2268 BTFIXUPSET_CALL(alloc_thread_info, sun4c_alloc_thread_info, BTFIXUPCALL_NORM);
2269 BTFIXUPSET_CALL(free_thread_info, sun4c_free_thread_info, BTFIXUPCALL_NORM);
2270
2271 BTFIXUPSET_CALL(mmu_info, sun4c_mmu_info, BTFIXUPCALL_NORM);
2272
2273 /* These should _never_ get called with two level tables. */
2274 BTFIXUPSET_CALL(pgd_set, sun4c_pgd_set, BTFIXUPCALL_NOP);
2275 BTFIXUPSET_CALL(pgd_page, sun4c_pgd_page, BTFIXUPCALL_RETO0);
2276}
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-14 23:33:49 -0500