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Linux-2.6.12-rc2
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / arch / sparc64 / mm / init.c
1 /* $Id: init.c,v 1.209 2002/02/09 19:49:31 davem Exp $
2 * arch/sparc64/mm/init.c
3 *
4 * Copyright (C) 1996-1999 David S. Miller (davem@caip.rutgers.edu)
5 * Copyright (C) 1997-1999 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
6 */
7
8 #include <linux/config.h>
9 #include <linux/kernel.h>
10 #include <linux/sched.h>
11 #include <linux/string.h>
12 #include <linux/init.h>
13 #include <linux/bootmem.h>
14 #include <linux/mm.h>
15 #include <linux/hugetlb.h>
16 #include <linux/slab.h>
17 #include <linux/initrd.h>
18 #include <linux/swap.h>
19 #include <linux/pagemap.h>
20 #include <linux/fs.h>
21 #include <linux/seq_file.h>
22
23 #include <asm/head.h>
24 #include <asm/system.h>
25 #include <asm/page.h>
26 #include <asm/pgalloc.h>
27 #include <asm/pgtable.h>
28 #include <asm/oplib.h>
29 #include <asm/iommu.h>
30 #include <asm/io.h>
31 #include <asm/uaccess.h>
32 #include <asm/mmu_context.h>
33 #include <asm/tlbflush.h>
34 #include <asm/dma.h>
35 #include <asm/starfire.h>
36 #include <asm/tlb.h>
37 #include <asm/spitfire.h>
38 #include <asm/sections.h>
39
40 extern void device_scan(void);
41
42 struct sparc_phys_banks sp_banks[SPARC_PHYS_BANKS];
43
44 unsigned long *sparc64_valid_addr_bitmap;
45
46 /* Ugly, but necessary... -DaveM */
47 unsigned long phys_base;
48 unsigned long kern_base;
49 unsigned long kern_size;
50 unsigned long pfn_base;
51
52 /* This is even uglier. We have a problem where the kernel may not be
53 * located at phys_base. However, initial __alloc_bootmem() calls need to
54 * be adjusted to be within the 4-8Megs that the kernel is mapped to, else
55 * those page mappings wont work. Things are ok after inherit_prom_mappings
56 * is called though. Dave says he'll clean this up some other time.
57 * -- BenC
58 */
59 static unsigned long bootmap_base;
60
61 /* get_new_mmu_context() uses "cache + 1". */
62 DEFINE_SPINLOCK(ctx_alloc_lock);
63 unsigned long tlb_context_cache = CTX_FIRST_VERSION - 1;
64 #define CTX_BMAP_SLOTS (1UL << (CTX_NR_BITS - 6))
65 unsigned long mmu_context_bmap[CTX_BMAP_SLOTS];
66
67 /* References to special section boundaries */
68 extern char _start[], _end[];
69
70 /* Initial ramdisk setup */
71 extern unsigned long sparc_ramdisk_image64;
72 extern unsigned int sparc_ramdisk_image;
73 extern unsigned int sparc_ramdisk_size;
74
75 struct page *mem_map_zero;
76
77 int bigkernel = 0;
78
79 /* XXX Tune this... */
80 #define PGT_CACHE_LOW 25
81 #define PGT_CACHE_HIGH 50
82
83 void check_pgt_cache(void)
84 {
85 preempt_disable();
86 if (pgtable_cache_size > PGT_CACHE_HIGH) {
87 do {
88 if (pgd_quicklist)
89 free_pgd_slow(get_pgd_fast());
90 if (pte_quicklist[0])
91 free_pte_slow(pte_alloc_one_fast(NULL, 0));
92 if (pte_quicklist[1])
93 free_pte_slow(pte_alloc_one_fast(NULL, 1 << (PAGE_SHIFT + 10)));
94 } while (pgtable_cache_size > PGT_CACHE_LOW);
95 }
96 preempt_enable();
97 }
98
99 #ifdef CONFIG_DEBUG_DCFLUSH
100 atomic_t dcpage_flushes = ATOMIC_INIT(0);
101 #ifdef CONFIG_SMP
102 atomic_t dcpage_flushes_xcall = ATOMIC_INIT(0);
103 #endif
104 #endif
105
106 __inline__ void flush_dcache_page_impl(struct page *page)
107 {
108 #ifdef CONFIG_DEBUG_DCFLUSH
109 atomic_inc(&dcpage_flushes);
110 #endif
111
112 #ifdef DCACHE_ALIASING_POSSIBLE
113 __flush_dcache_page(page_address(page),
114 ((tlb_type == spitfire) &&
115 page_mapping(page) != NULL));
116 #else
117 if (page_mapping(page) != NULL &&
118 tlb_type == spitfire)
119 __flush_icache_page(__pa(page_address(page)));
120 #endif
121 }
122
123 #define PG_dcache_dirty PG_arch_1
124
125 #define dcache_dirty_cpu(page) \
126 (((page)->flags >> 24) & (NR_CPUS - 1UL))
127
128 static __inline__ void set_dcache_dirty(struct page *page, int this_cpu)
129 {
130 unsigned long mask = this_cpu;
131 unsigned long non_cpu_bits = ~((NR_CPUS - 1UL) << 24UL);
132 mask = (mask << 24) | (1UL << PG_dcache_dirty);
133 __asm__ __volatile__("1:\n\t"
134 "ldx [%2], %%g7\n\t"
135 "and %%g7, %1, %%g1\n\t"
136 "or %%g1, %0, %%g1\n\t"
137 "casx [%2], %%g7, %%g1\n\t"
138 "cmp %%g7, %%g1\n\t"
139 "bne,pn %%xcc, 1b\n\t"
140 " membar #StoreLoad | #StoreStore"
141 : /* no outputs */
142 : "r" (mask), "r" (non_cpu_bits), "r" (&page->flags)
143 : "g1", "g7");
144 }
145
146 static __inline__ void clear_dcache_dirty_cpu(struct page *page, unsigned long cpu)
147 {
148 unsigned long mask = (1UL << PG_dcache_dirty);
149
150 __asm__ __volatile__("! test_and_clear_dcache_dirty\n"
151 "1:\n\t"
152 "ldx [%2], %%g7\n\t"
153 "srlx %%g7, 24, %%g1\n\t"
154 "and %%g1, %3, %%g1\n\t"
155 "cmp %%g1, %0\n\t"
156 "bne,pn %%icc, 2f\n\t"
157 " andn %%g7, %1, %%g1\n\t"
158 "casx [%2], %%g7, %%g1\n\t"
159 "cmp %%g7, %%g1\n\t"
160 "bne,pn %%xcc, 1b\n\t"
161 " membar #StoreLoad | #StoreStore\n"
162 "2:"
163 : /* no outputs */
164 : "r" (cpu), "r" (mask), "r" (&page->flags),
165 "i" (NR_CPUS - 1UL)
166 : "g1", "g7");
167 }
168
169 extern void __update_mmu_cache(unsigned long mmu_context_hw, unsigned long address, pte_t pte, int code);
170
171 void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t pte)
172 {
173 struct page *page;
174 unsigned long pfn;
175 unsigned long pg_flags;
176
177 pfn = pte_pfn(pte);
178 if (pfn_valid(pfn) &&
179 (page = pfn_to_page(pfn), page_mapping(page)) &&
180 ((pg_flags = page->flags) & (1UL << PG_dcache_dirty))) {
181 int cpu = ((pg_flags >> 24) & (NR_CPUS - 1UL));
182 int this_cpu = get_cpu();
183
184 /* This is just to optimize away some function calls
185 * in the SMP case.
186 */
187 if (cpu == this_cpu)
188 flush_dcache_page_impl(page);
189 else
190 smp_flush_dcache_page_impl(page, cpu);
191
192 clear_dcache_dirty_cpu(page, cpu);
193
194 put_cpu();
195 }
196
197 if (get_thread_fault_code())
198 __update_mmu_cache(CTX_NRBITS(vma->vm_mm->context),
199 address, pte, get_thread_fault_code());
200 }
201
202 void flush_dcache_page(struct page *page)
203 {
204 struct address_space *mapping = page_mapping(page);
205 int dirty = test_bit(PG_dcache_dirty, &page->flags);
206 int dirty_cpu = dcache_dirty_cpu(page);
207 int this_cpu = get_cpu();
208
209 if (mapping && !mapping_mapped(mapping)) {
210 if (dirty) {
211 if (dirty_cpu == this_cpu)
212 goto out;
213 smp_flush_dcache_page_impl(page, dirty_cpu);
214 }
215 set_dcache_dirty(page, this_cpu);
216 } else {
217 /* We could delay the flush for the !page_mapping
218 * case too. But that case is for exec env/arg
219 * pages and those are %99 certainly going to get
220 * faulted into the tlb (and thus flushed) anyways.
221 */
222 flush_dcache_page_impl(page);
223 }
224
225 out:
226 put_cpu();
227 }
228
229 void flush_icache_range(unsigned long start, unsigned long end)
230 {
231 /* Cheetah has coherent I-cache. */
232 if (tlb_type == spitfire) {
233 unsigned long kaddr;
234
235 for (kaddr = start; kaddr < end; kaddr += PAGE_SIZE)
236 __flush_icache_page(__get_phys(kaddr));
237 }
238 }
239
240 unsigned long page_to_pfn(struct page *page)
241 {
242 return (unsigned long) ((page - mem_map) + pfn_base);
243 }
244
245 struct page *pfn_to_page(unsigned long pfn)
246 {
247 return (mem_map + (pfn - pfn_base));
248 }
249
250 void show_mem(void)
251 {
252 printk("Mem-info:\n");
253 show_free_areas();
254 printk("Free swap: %6ldkB\n",
255 nr_swap_pages << (PAGE_SHIFT-10));
256 printk("%ld pages of RAM\n", num_physpages);
257 printk("%d free pages\n", nr_free_pages());
258 printk("%d pages in page table cache\n",pgtable_cache_size);
259 }
260
261 void mmu_info(struct seq_file *m)
262 {
263 if (tlb_type == cheetah)
264 seq_printf(m, "MMU Type\t: Cheetah\n");
265 else if (tlb_type == cheetah_plus)
266 seq_printf(m, "MMU Type\t: Cheetah+\n");
267 else if (tlb_type == spitfire)
268 seq_printf(m, "MMU Type\t: Spitfire\n");
269 else
270 seq_printf(m, "MMU Type\t: ???\n");
271
272 #ifdef CONFIG_DEBUG_DCFLUSH
273 seq_printf(m, "DCPageFlushes\t: %d\n",
274 atomic_read(&dcpage_flushes));
275 #ifdef CONFIG_SMP
276 seq_printf(m, "DCPageFlushesXC\t: %d\n",
277 atomic_read(&dcpage_flushes_xcall));
278 #endif /* CONFIG_SMP */
279 #endif /* CONFIG_DEBUG_DCFLUSH */
280 }
281
282 struct linux_prom_translation {
283 unsigned long virt;
284 unsigned long size;
285 unsigned long data;
286 };
287
288 extern unsigned long prom_boot_page;
289 extern void prom_remap(unsigned long physpage, unsigned long virtpage, int mmu_ihandle);
290 extern int prom_get_mmu_ihandle(void);
291 extern void register_prom_callbacks(void);
292
293 /* Exported for SMP bootup purposes. */
294 unsigned long kern_locked_tte_data;
295
296 void __init early_pgtable_allocfail(char *type)
297 {
298 prom_printf("inherit_prom_mappings: Cannot alloc kernel %s.\n", type);
299 prom_halt();
300 }
301
302 #define BASE_PAGE_SIZE 8192
303 static pmd_t *prompmd;
304
305 /*
306 * Translate PROM's mapping we capture at boot time into physical address.
307 * The second parameter is only set from prom_callback() invocations.
308 */
309 unsigned long prom_virt_to_phys(unsigned long promva, int *error)
310 {
311 pmd_t *pmdp = prompmd + ((promva >> 23) & 0x7ff);
312 pte_t *ptep;
313 unsigned long base;
314
315 if (pmd_none(*pmdp)) {
316 if (error)
317 *error = 1;
318 return(0);
319 }
320 ptep = (pte_t *)__pmd_page(*pmdp) + ((promva >> 13) & 0x3ff);
321 if (!pte_present(*ptep)) {
322 if (error)
323 *error = 1;
324 return(0);
325 }
326 if (error) {
327 *error = 0;
328 return(pte_val(*ptep));
329 }
330 base = pte_val(*ptep) & _PAGE_PADDR;
331 return(base + (promva & (BASE_PAGE_SIZE - 1)));
332 }
333
334 static void inherit_prom_mappings(void)
335 {
336 struct linux_prom_translation *trans;
337 unsigned long phys_page, tte_vaddr, tte_data;
338 void (*remap_func)(unsigned long, unsigned long, int);
339 pmd_t *pmdp;
340 pte_t *ptep;
341 int node, n, i, tsz;
342 extern unsigned int obp_iaddr_patch[2], obp_daddr_patch[2];
343
344 node = prom_finddevice("/virtual-memory");
345 n = prom_getproplen(node, "translations");
346 if (n == 0 || n == -1) {
347 prom_printf("Couldn't get translation property\n");
348 prom_halt();
349 }
350 n += 5 * sizeof(struct linux_prom_translation);
351 for (tsz = 1; tsz < n; tsz <<= 1)
352 /* empty */;
353 trans = __alloc_bootmem(tsz, SMP_CACHE_BYTES, bootmap_base);
354 if (trans == NULL) {
355 prom_printf("inherit_prom_mappings: Cannot alloc translations.\n");
356 prom_halt();
357 }
358 memset(trans, 0, tsz);
359
360 if ((n = prom_getproperty(node, "translations", (char *)trans, tsz)) == -1) {
361 prom_printf("Couldn't get translation property\n");
362 prom_halt();
363 }
364 n = n / sizeof(*trans);
365
366 /*
367 * The obp translations are saved based on 8k pagesize, since obp can
368 * use a mixture of pagesizes. Misses to the 0xf0000000 - 0x100000000,
369 * ie obp range, are handled in entry.S and do not use the vpte scheme
370 * (see rant in inherit_locked_prom_mappings()).
371 */
372 #define OBP_PMD_SIZE 2048
373 prompmd = __alloc_bootmem(OBP_PMD_SIZE, OBP_PMD_SIZE, bootmap_base);
374 if (prompmd == NULL)
375 early_pgtable_allocfail("pmd");
376 memset(prompmd, 0, OBP_PMD_SIZE);
377 for (i = 0; i < n; i++) {
378 unsigned long vaddr;
379
380 if (trans[i].virt >= LOW_OBP_ADDRESS && trans[i].virt < HI_OBP_ADDRESS) {
381 for (vaddr = trans[i].virt;
382 ((vaddr < trans[i].virt + trans[i].size) &&
383 (vaddr < HI_OBP_ADDRESS));
384 vaddr += BASE_PAGE_SIZE) {
385 unsigned long val;
386
387 pmdp = prompmd + ((vaddr >> 23) & 0x7ff);
388 if (pmd_none(*pmdp)) {
389 ptep = __alloc_bootmem(BASE_PAGE_SIZE,
390 BASE_PAGE_SIZE,
391 bootmap_base);
392 if (ptep == NULL)
393 early_pgtable_allocfail("pte");
394 memset(ptep, 0, BASE_PAGE_SIZE);
395 pmd_set(pmdp, ptep);
396 }
397 ptep = (pte_t *)__pmd_page(*pmdp) +
398 ((vaddr >> 13) & 0x3ff);
399
400 val = trans[i].data;
401
402 /* Clear diag TTE bits. */
403 if (tlb_type == spitfire)
404 val &= ~0x0003fe0000000000UL;
405
406 set_pte_at(&init_mm, vaddr,
407 ptep, __pte(val | _PAGE_MODIFIED));
408 trans[i].data += BASE_PAGE_SIZE;
409 }
410 }
411 }
412 phys_page = __pa(prompmd);
413 obp_iaddr_patch[0] |= (phys_page >> 10);
414 obp_iaddr_patch[1] |= (phys_page & 0x3ff);
415 flushi((long)&obp_iaddr_patch[0]);
416 obp_daddr_patch[0] |= (phys_page >> 10);
417 obp_daddr_patch[1] |= (phys_page & 0x3ff);
418 flushi((long)&obp_daddr_patch[0]);
419
420 /* Now fixup OBP's idea about where we really are mapped. */
421 prom_printf("Remapping the kernel... ");
422
423 /* Spitfire Errata #32 workaround */
424 /* NOTE: Using plain zero for the context value is
425 * correct here, we are not using the Linux trap
426 * tables yet so we should not use the special
427 * UltraSPARC-III+ page size encodings yet.
428 */
429 __asm__ __volatile__("stxa %0, [%1] %2\n\t"
430 "flush %%g6"
431 : /* No outputs */
432 : "r" (0), "r" (PRIMARY_CONTEXT), "i" (ASI_DMMU));
433
434 switch (tlb_type) {
435 default:
436 case spitfire:
437 phys_page = spitfire_get_dtlb_data(sparc64_highest_locked_tlbent());
438 break;
439
440 case cheetah:
441 case cheetah_plus:
442 phys_page = cheetah_get_litlb_data(sparc64_highest_locked_tlbent());
443 break;
444 };
445
446 phys_page &= _PAGE_PADDR;
447 phys_page += ((unsigned long)&prom_boot_page -
448 (unsigned long)KERNBASE);
449
450 if (tlb_type == spitfire) {
451 /* Lock this into i/d tlb entry 59 */
452 __asm__ __volatile__(
453 "stxa %%g0, [%2] %3\n\t"
454 "stxa %0, [%1] %4\n\t"
455 "membar #Sync\n\t"
456 "flush %%g6\n\t"
457 "stxa %%g0, [%2] %5\n\t"
458 "stxa %0, [%1] %6\n\t"
459 "membar #Sync\n\t"
460 "flush %%g6"
461 : : "r" (phys_page | _PAGE_VALID | _PAGE_SZ8K | _PAGE_CP |
462 _PAGE_CV | _PAGE_P | _PAGE_L | _PAGE_W),
463 "r" (59 << 3), "r" (TLB_TAG_ACCESS),
464 "i" (ASI_DMMU), "i" (ASI_DTLB_DATA_ACCESS),
465 "i" (ASI_IMMU), "i" (ASI_ITLB_DATA_ACCESS)
466 : "memory");
467 } else if (tlb_type == cheetah || tlb_type == cheetah_plus) {
468 /* Lock this into i/d tlb-0 entry 11 */
469 __asm__ __volatile__(
470 "stxa %%g0, [%2] %3\n\t"
471 "stxa %0, [%1] %4\n\t"
472 "membar #Sync\n\t"
473 "flush %%g6\n\t"
474 "stxa %%g0, [%2] %5\n\t"
475 "stxa %0, [%1] %6\n\t"
476 "membar #Sync\n\t"
477 "flush %%g6"
478 : : "r" (phys_page | _PAGE_VALID | _PAGE_SZ8K | _PAGE_CP |
479 _PAGE_CV | _PAGE_P | _PAGE_L | _PAGE_W),
480 "r" ((0 << 16) | (11 << 3)), "r" (TLB_TAG_ACCESS),
481 "i" (ASI_DMMU), "i" (ASI_DTLB_DATA_ACCESS),
482 "i" (ASI_IMMU), "i" (ASI_ITLB_DATA_ACCESS)
483 : "memory");
484 } else {
485 /* Implement me :-) */
486 BUG();
487 }
488
489 tte_vaddr = (unsigned long) KERNBASE;
490
491 /* Spitfire Errata #32 workaround */
492 /* NOTE: Using plain zero for the context value is
493 * correct here, we are not using the Linux trap
494 * tables yet so we should not use the special
495 * UltraSPARC-III+ page size encodings yet.
496 */
497 __asm__ __volatile__("stxa %0, [%1] %2\n\t"
498 "flush %%g6"
499 : /* No outputs */
500 : "r" (0),
501 "r" (PRIMARY_CONTEXT), "i" (ASI_DMMU));
502
503 if (tlb_type == spitfire)
504 tte_data = spitfire_get_dtlb_data(sparc64_highest_locked_tlbent());
505 else
506 tte_data = cheetah_get_ldtlb_data(sparc64_highest_locked_tlbent());
507
508 kern_locked_tte_data = tte_data;
509
510 remap_func = (void *) ((unsigned long) &prom_remap -
511 (unsigned long) &prom_boot_page);
512
513
514 /* Spitfire Errata #32 workaround */
515 /* NOTE: Using plain zero for the context value is
516 * correct here, we are not using the Linux trap
517 * tables yet so we should not use the special
518 * UltraSPARC-III+ page size encodings yet.
519 */
520 __asm__ __volatile__("stxa %0, [%1] %2\n\t"
521 "flush %%g6"
522 : /* No outputs */
523 : "r" (0),
524 "r" (PRIMARY_CONTEXT), "i" (ASI_DMMU));
525
526 remap_func((tlb_type == spitfire ?
527 (spitfire_get_dtlb_data(sparc64_highest_locked_tlbent()) & _PAGE_PADDR) :
528 (cheetah_get_litlb_data(sparc64_highest_locked_tlbent()) & _PAGE_PADDR)),
529 (unsigned long) KERNBASE,
530 prom_get_mmu_ihandle());
531
532 if (bigkernel)
533 remap_func(((tte_data + 0x400000) & _PAGE_PADDR),
534 (unsigned long) KERNBASE + 0x400000, prom_get_mmu_ihandle());
535
536 /* Flush out that temporary mapping. */
537 spitfire_flush_dtlb_nucleus_page(0x0);
538 spitfire_flush_itlb_nucleus_page(0x0);
539
540 /* Now lock us back into the TLBs via OBP. */
541 prom_dtlb_load(sparc64_highest_locked_tlbent(), tte_data, tte_vaddr);
542 prom_itlb_load(sparc64_highest_locked_tlbent(), tte_data, tte_vaddr);
543 if (bigkernel) {
544 prom_dtlb_load(sparc64_highest_locked_tlbent()-1, tte_data + 0x400000,
545 tte_vaddr + 0x400000);
546 prom_itlb_load(sparc64_highest_locked_tlbent()-1, tte_data + 0x400000,
547 tte_vaddr + 0x400000);
548 }
549
550 /* Re-read translations property. */
551 if ((n = prom_getproperty(node, "translations", (char *)trans, tsz)) == -1) {
552 prom_printf("Couldn't get translation property\n");
553 prom_halt();
554 }
555 n = n / sizeof(*trans);
556
557 for (i = 0; i < n; i++) {
558 unsigned long vaddr = trans[i].virt;
559 unsigned long size = trans[i].size;
560
561 if (vaddr < 0xf0000000UL) {
562 unsigned long avoid_start = (unsigned long) KERNBASE;
563 unsigned long avoid_end = avoid_start + (4 * 1024 * 1024);
564
565 if (bigkernel)
566 avoid_end += (4 * 1024 * 1024);
567 if (vaddr < avoid_start) {
568 unsigned long top = vaddr + size;
569
570 if (top > avoid_start)
571 top = avoid_start;
572 prom_unmap(top - vaddr, vaddr);
573 }
574 if ((vaddr + size) > avoid_end) {
575 unsigned long bottom = vaddr;
576
577 if (bottom < avoid_end)
578 bottom = avoid_end;
579 prom_unmap((vaddr + size) - bottom, bottom);
580 }
581 }
582 }
583
584 prom_printf("done.\n");
585
586 register_prom_callbacks();
587 }
588
589 /* The OBP specifications for sun4u mark 0xfffffffc00000000 and
590 * upwards as reserved for use by the firmware (I wonder if this
591 * will be the same on Cheetah...). We use this virtual address
592 * range for the VPTE table mappings of the nucleus so we need
593 * to zap them when we enter the PROM. -DaveM
594 */
595 static void __flush_nucleus_vptes(void)
596 {
597 unsigned long prom_reserved_base = 0xfffffffc00000000UL;
598 int i;
599
600 /* Only DTLB must be checked for VPTE entries. */
601 if (tlb_type == spitfire) {
602 for (i = 0; i < 63; i++) {
603 unsigned long tag;
604
605 /* Spitfire Errata #32 workaround */
606 /* NOTE: Always runs on spitfire, so no cheetah+
607 * page size encodings.
608 */
609 __asm__ __volatile__("stxa %0, [%1] %2\n\t"
610 "flush %%g6"
611 : /* No outputs */
612 : "r" (0),
613 "r" (PRIMARY_CONTEXT), "i" (ASI_DMMU));
614
615 tag = spitfire_get_dtlb_tag(i);
616 if (((tag & ~(PAGE_MASK)) == 0) &&
617 ((tag & (PAGE_MASK)) >= prom_reserved_base)) {
618 __asm__ __volatile__("stxa %%g0, [%0] %1\n\t"
619 "membar #Sync"
620 : /* no outputs */
621 : "r" (TLB_TAG_ACCESS), "i" (ASI_DMMU));
622 spitfire_put_dtlb_data(i, 0x0UL);
623 }
624 }
625 } else if (tlb_type == cheetah || tlb_type == cheetah_plus) {
626 for (i = 0; i < 512; i++) {
627 unsigned long tag = cheetah_get_dtlb_tag(i, 2);
628
629 if ((tag & ~PAGE_MASK) == 0 &&
630 (tag & PAGE_MASK) >= prom_reserved_base) {
631 __asm__ __volatile__("stxa %%g0, [%0] %1\n\t"
632 "membar #Sync"
633 : /* no outputs */
634 : "r" (TLB_TAG_ACCESS), "i" (ASI_DMMU));
635 cheetah_put_dtlb_data(i, 0x0UL, 2);
636 }
637
638 if (tlb_type != cheetah_plus)
639 continue;
640
641 tag = cheetah_get_dtlb_tag(i, 3);
642
643 if ((tag & ~PAGE_MASK) == 0 &&
644 (tag & PAGE_MASK) >= prom_reserved_base) {
645 __asm__ __volatile__("stxa %%g0, [%0] %1\n\t"
646 "membar #Sync"
647 : /* no outputs */
648 : "r" (TLB_TAG_ACCESS), "i" (ASI_DMMU));
649 cheetah_put_dtlb_data(i, 0x0UL, 3);
650 }
651 }
652 } else {
653 /* Implement me :-) */
654 BUG();
655 }
656 }
657
658 static int prom_ditlb_set;
659 struct prom_tlb_entry {
660 int tlb_ent;
661 unsigned long tlb_tag;
662 unsigned long tlb_data;
663 };
664 struct prom_tlb_entry prom_itlb[16], prom_dtlb[16];
665
666 void prom_world(int enter)
667 {
668 unsigned long pstate;
669 int i;
670
671 if (!enter)
672 set_fs((mm_segment_t) { get_thread_current_ds() });
673
674 if (!prom_ditlb_set)
675 return;
676
677 /* Make sure the following runs atomically. */
678 __asm__ __volatile__("flushw\n\t"
679 "rdpr %%pstate, %0\n\t"
680 "wrpr %0, %1, %%pstate"
681 : "=r" (pstate)
682 : "i" (PSTATE_IE));
683
684 if (enter) {
685 /* Kick out nucleus VPTEs. */
686 __flush_nucleus_vptes();
687
688 /* Install PROM world. */
689 for (i = 0; i < 16; i++) {
690 if (prom_dtlb[i].tlb_ent != -1) {
691 __asm__ __volatile__("stxa %0, [%1] %2\n\t"
692 "membar #Sync"
693 : : "r" (prom_dtlb[i].tlb_tag), "r" (TLB_TAG_ACCESS),
694 "i" (ASI_DMMU));
695 if (tlb_type == spitfire)
696 spitfire_put_dtlb_data(prom_dtlb[i].tlb_ent,
697 prom_dtlb[i].tlb_data);
698 else if (tlb_type == cheetah || tlb_type == cheetah_plus)
699 cheetah_put_ldtlb_data(prom_dtlb[i].tlb_ent,
700 prom_dtlb[i].tlb_data);
701 }
702 if (prom_itlb[i].tlb_ent != -1) {
703 __asm__ __volatile__("stxa %0, [%1] %2\n\t"
704 "membar #Sync"
705 : : "r" (prom_itlb[i].tlb_tag),
706 "r" (TLB_TAG_ACCESS),
707 "i" (ASI_IMMU));
708 if (tlb_type == spitfire)
709 spitfire_put_itlb_data(prom_itlb[i].tlb_ent,
710 prom_itlb[i].tlb_data);
711 else if (tlb_type == cheetah || tlb_type == cheetah_plus)
712 cheetah_put_litlb_data(prom_itlb[i].tlb_ent,
713 prom_itlb[i].tlb_data);
714 }
715 }
716 } else {
717 for (i = 0; i < 16; i++) {
718 if (prom_dtlb[i].tlb_ent != -1) {
719 __asm__ __volatile__("stxa %%g0, [%0] %1\n\t"
720 "membar #Sync"
721 : : "r" (TLB_TAG_ACCESS), "i" (ASI_DMMU));
722 if (tlb_type == spitfire)
723 spitfire_put_dtlb_data(prom_dtlb[i].tlb_ent, 0x0UL);
724 else
725 cheetah_put_ldtlb_data(prom_dtlb[i].tlb_ent, 0x0UL);
726 }
727 if (prom_itlb[i].tlb_ent != -1) {
728 __asm__ __volatile__("stxa %%g0, [%0] %1\n\t"
729 "membar #Sync"
730 : : "r" (TLB_TAG_ACCESS),
731 "i" (ASI_IMMU));
732 if (tlb_type == spitfire)
733 spitfire_put_itlb_data(prom_itlb[i].tlb_ent, 0x0UL);
734 else
735 cheetah_put_litlb_data(prom_itlb[i].tlb_ent, 0x0UL);
736 }
737 }
738 }
739 __asm__ __volatile__("wrpr %0, 0, %%pstate"
740 : : "r" (pstate));
741 }
742
743 void inherit_locked_prom_mappings(int save_p)
744 {
745 int i;
746 int dtlb_seen = 0;
747 int itlb_seen = 0;
748
749 /* Fucking losing PROM has more mappings in the TLB, but
750 * it (conveniently) fails to mention any of these in the
751 * translations property. The only ones that matter are
752 * the locked PROM tlb entries, so we impose the following
753 * irrecovable rule on the PROM, it is allowed 8 locked
754 * entries in the ITLB and 8 in the DTLB.
755 *
756 * Supposedly the upper 16GB of the address space is
757 * reserved for OBP, BUT I WISH THIS WAS DOCUMENTED
758 * SOMEWHERE!!!!!!!!!!!!!!!!! Furthermore the entire interface
759 * used between the client program and the firmware on sun5
760 * systems to coordinate mmu mappings is also COMPLETELY
761 * UNDOCUMENTED!!!!!! Thanks S(t)un!
762 */
763 if (save_p) {
764 for (i = 0; i < 16; i++) {
765 prom_itlb[i].tlb_ent = -1;
766 prom_dtlb[i].tlb_ent = -1;
767 }
768 }
769 if (tlb_type == spitfire) {
770 int high = SPITFIRE_HIGHEST_LOCKED_TLBENT - bigkernel;
771 for (i = 0; i < high; i++) {
772 unsigned long data;
773
774 /* Spitfire Errata #32 workaround */
775 /* NOTE: Always runs on spitfire, so no cheetah+
776 * page size encodings.
777 */
778 __asm__ __volatile__("stxa %0, [%1] %2\n\t"
779 "flush %%g6"
780 : /* No outputs */
781 : "r" (0),
782 "r" (PRIMARY_CONTEXT), "i" (ASI_DMMU));
783
784 data = spitfire_get_dtlb_data(i);
785 if ((data & (_PAGE_L|_PAGE_VALID)) == (_PAGE_L|_PAGE_VALID)) {
786 unsigned long tag;
787
788 /* Spitfire Errata #32 workaround */
789 /* NOTE: Always runs on spitfire, so no
790 * cheetah+ page size encodings.
791 */
792 __asm__ __volatile__("stxa %0, [%1] %2\n\t"
793 "flush %%g6"
794 : /* No outputs */
795 : "r" (0),
796 "r" (PRIMARY_CONTEXT), "i" (ASI_DMMU));
797
798 tag = spitfire_get_dtlb_tag(i);
799 if (save_p) {
800 prom_dtlb[dtlb_seen].tlb_ent = i;
801 prom_dtlb[dtlb_seen].tlb_tag = tag;
802 prom_dtlb[dtlb_seen].tlb_data = data;
803 }
804 __asm__ __volatile__("stxa %%g0, [%0] %1\n\t"
805 "membar #Sync"
806 : : "r" (TLB_TAG_ACCESS), "i" (ASI_DMMU));
807 spitfire_put_dtlb_data(i, 0x0UL);
808
809 dtlb_seen++;
810 if (dtlb_seen > 15)
811 break;
812 }
813 }
814
815 for (i = 0; i < high; i++) {
816 unsigned long data;
817
818 /* Spitfire Errata #32 workaround */
819 /* NOTE: Always runs on spitfire, so no
820 * cheetah+ page size encodings.
821 */
822 __asm__ __volatile__("stxa %0, [%1] %2\n\t"
823 "flush %%g6"
824 : /* No outputs */
825 : "r" (0),
826 "r" (PRIMARY_CONTEXT), "i" (ASI_DMMU));
827
828 data = spitfire_get_itlb_data(i);
829 if ((data & (_PAGE_L|_PAGE_VALID)) == (_PAGE_L|_PAGE_VALID)) {
830 unsigned long tag;
831
832 /* Spitfire Errata #32 workaround */
833 /* NOTE: Always runs on spitfire, so no
834 * cheetah+ page size encodings.
835 */
836 __asm__ __volatile__("stxa %0, [%1] %2\n\t"
837 "flush %%g6"
838 : /* No outputs */
839 : "r" (0),
840 "r" (PRIMARY_CONTEXT), "i" (ASI_DMMU));
841
842 tag = spitfire_get_itlb_tag(i);
843 if (save_p) {
844 prom_itlb[itlb_seen].tlb_ent = i;
845 prom_itlb[itlb_seen].tlb_tag = tag;
846 prom_itlb[itlb_seen].tlb_data = data;
847 }
848 __asm__ __volatile__("stxa %%g0, [%0] %1\n\t"
849 "membar #Sync"
850 : : "r" (TLB_TAG_ACCESS), "i" (ASI_IMMU));
851 spitfire_put_itlb_data(i, 0x0UL);
852
853 itlb_seen++;
854 if (itlb_seen > 15)
855 break;
856 }
857 }
858 } else if (tlb_type == cheetah || tlb_type == cheetah_plus) {
859 int high = CHEETAH_HIGHEST_LOCKED_TLBENT - bigkernel;
860
861 for (i = 0; i < high; i++) {
862 unsigned long data;
863
864 data = cheetah_get_ldtlb_data(i);
865 if ((data & (_PAGE_L|_PAGE_VALID)) == (_PAGE_L|_PAGE_VALID)) {
866 unsigned long tag;
867
868 tag = cheetah_get_ldtlb_tag(i);
869 if (save_p) {
870 prom_dtlb[dtlb_seen].tlb_ent = i;
871 prom_dtlb[dtlb_seen].tlb_tag = tag;
872 prom_dtlb[dtlb_seen].tlb_data = data;
873 }
874 __asm__ __volatile__("stxa %%g0, [%0] %1\n\t"
875 "membar #Sync"
876 : : "r" (TLB_TAG_ACCESS), "i" (ASI_DMMU));
877 cheetah_put_ldtlb_data(i, 0x0UL);
878
879 dtlb_seen++;
880 if (dtlb_seen > 15)
881 break;
882 }
883 }
884
885 for (i = 0; i < high; i++) {
886 unsigned long data;
887
888 data = cheetah_get_litlb_data(i);
889 if ((data & (_PAGE_L|_PAGE_VALID)) == (_PAGE_L|_PAGE_VALID)) {
890 unsigned long tag;
891
892 tag = cheetah_get_litlb_tag(i);
893 if (save_p) {
894 prom_itlb[itlb_seen].tlb_ent = i;
895 prom_itlb[itlb_seen].tlb_tag = tag;
896 prom_itlb[itlb_seen].tlb_data = data;
897 }
898 __asm__ __volatile__("stxa %%g0, [%0] %1\n\t"
899 "membar #Sync"
900 : : "r" (TLB_TAG_ACCESS), "i" (ASI_IMMU));
901 cheetah_put_litlb_data(i, 0x0UL);
902
903 itlb_seen++;
904 if (itlb_seen > 15)
905 break;
906 }
907 }
908 } else {
909 /* Implement me :-) */
910 BUG();
911 }
912 if (save_p)
913 prom_ditlb_set = 1;
914 }
915
916 /* Give PROM back his world, done during reboots... */
917 void prom_reload_locked(void)
918 {
919 int i;
920
921 for (i = 0; i < 16; i++) {
922 if (prom_dtlb[i].tlb_ent != -1) {
923 __asm__ __volatile__("stxa %0, [%1] %2\n\t"
924 "membar #Sync"
925 : : "r" (prom_dtlb[i].tlb_tag), "r" (TLB_TAG_ACCESS),
926 "i" (ASI_DMMU));
927 if (tlb_type == spitfire)
928 spitfire_put_dtlb_data(prom_dtlb[i].tlb_ent,
929 prom_dtlb[i].tlb_data);
930 else if (tlb_type == cheetah || tlb_type == cheetah_plus)
931 cheetah_put_ldtlb_data(prom_dtlb[i].tlb_ent,
932 prom_dtlb[i].tlb_data);
933 }
934
935 if (prom_itlb[i].tlb_ent != -1) {
936 __asm__ __volatile__("stxa %0, [%1] %2\n\t"
937 "membar #Sync"
938 : : "r" (prom_itlb[i].tlb_tag),
939 "r" (TLB_TAG_ACCESS),
940 "i" (ASI_IMMU));
941 if (tlb_type == spitfire)
942 spitfire_put_itlb_data(prom_itlb[i].tlb_ent,
943 prom_itlb[i].tlb_data);
944 else
945 cheetah_put_litlb_data(prom_itlb[i].tlb_ent,
946 prom_itlb[i].tlb_data);
947 }
948 }
949 }
950
951 #ifdef DCACHE_ALIASING_POSSIBLE
952 void __flush_dcache_range(unsigned long start, unsigned long end)
953 {
954 unsigned long va;
955
956 if (tlb_type == spitfire) {
957 int n = 0;
958
959 for (va = start; va < end; va += 32) {
960 spitfire_put_dcache_tag(va & 0x3fe0, 0x0);
961 if (++n >= 512)
962 break;
963 }
964 } else {
965 start = __pa(start);
966 end = __pa(end);
967 for (va = start; va < end; va += 32)
968 __asm__ __volatile__("stxa %%g0, [%0] %1\n\t"
969 "membar #Sync"
970 : /* no outputs */
971 : "r" (va),
972 "i" (ASI_DCACHE_INVALIDATE));
973 }
974 }
975 #endif /* DCACHE_ALIASING_POSSIBLE */
976
977 /* If not locked, zap it. */
978 void __flush_tlb_all(void)
979 {
980 unsigned long pstate;
981 int i;
982
983 __asm__ __volatile__("flushw\n\t"
984 "rdpr %%pstate, %0\n\t"
985 "wrpr %0, %1, %%pstate"
986 : "=r" (pstate)
987 : "i" (PSTATE_IE));
988 if (tlb_type == spitfire) {
989 for (i = 0; i < 64; i++) {
990 /* Spitfire Errata #32 workaround */
991 /* NOTE: Always runs on spitfire, so no
992 * cheetah+ page size encodings.
993 */
994 __asm__ __volatile__("stxa %0, [%1] %2\n\t"
995 "flush %%g6"
996 : /* No outputs */
997 : "r" (0),
998 "r" (PRIMARY_CONTEXT), "i" (ASI_DMMU));
999
1000 if (!(spitfire_get_dtlb_data(i) & _PAGE_L)) {
1001 __asm__ __volatile__("stxa %%g0, [%0] %1\n\t"
1002 "membar #Sync"
1003 : /* no outputs */
1004 : "r" (TLB_TAG_ACCESS), "i" (ASI_DMMU));
1005 spitfire_put_dtlb_data(i, 0x0UL);
1006 }
1007
1008 /* Spitfire Errata #32 workaround */
1009 /* NOTE: Always runs on spitfire, so no
1010 * cheetah+ page size encodings.
1011 */
1012 __asm__ __volatile__("stxa %0, [%1] %2\n\t"
1013 "flush %%g6"
1014 : /* No outputs */
1015 : "r" (0),
1016 "r" (PRIMARY_CONTEXT), "i" (ASI_DMMU));
1017
1018 if (!(spitfire_get_itlb_data(i) & _PAGE_L)) {
1019 __asm__ __volatile__("stxa %%g0, [%0] %1\n\t"
1020 "membar #Sync"
1021 : /* no outputs */
1022 : "r" (TLB_TAG_ACCESS), "i" (ASI_IMMU));
1023 spitfire_put_itlb_data(i, 0x0UL);
1024 }
1025 }
1026 } else if (tlb_type == cheetah || tlb_type == cheetah_plus) {
1027 cheetah_flush_dtlb_all();
1028 cheetah_flush_itlb_all();
1029 }
1030 __asm__ __volatile__("wrpr %0, 0, %%pstate"
1031 : : "r" (pstate));
1032 }
1033
1034 /* Caller does TLB context flushing on local CPU if necessary.
1035 * The caller also ensures that CTX_VALID(mm->context) is false.
1036 *
1037 * We must be careful about boundary cases so that we never
1038 * let the user have CTX 0 (nucleus) or we ever use a CTX
1039 * version of zero (and thus NO_CONTEXT would not be caught
1040 * by version mis-match tests in mmu_context.h).
1041 */
1042 void get_new_mmu_context(struct mm_struct *mm)
1043 {
1044 unsigned long ctx, new_ctx;
1045 unsigned long orig_pgsz_bits;
1046
1047
1048 spin_lock(&ctx_alloc_lock);
1049 orig_pgsz_bits = (mm->context.sparc64_ctx_val & CTX_PGSZ_MASK);
1050 ctx = (tlb_context_cache + 1) & CTX_NR_MASK;
1051 new_ctx = find_next_zero_bit(mmu_context_bmap, 1 << CTX_NR_BITS, ctx);
1052 if (new_ctx >= (1 << CTX_NR_BITS)) {
1053 new_ctx = find_next_zero_bit(mmu_context_bmap, ctx, 1);
1054 if (new_ctx >= ctx) {
1055 int i;
1056 new_ctx = (tlb_context_cache & CTX_VERSION_MASK) +
1057 CTX_FIRST_VERSION;
1058 if (new_ctx == 1)
1059 new_ctx = CTX_FIRST_VERSION;
1060
1061 /* Don't call memset, for 16 entries that's just
1062 * plain silly...
1063 */
1064 mmu_context_bmap[0] = 3;
1065 mmu_context_bmap[1] = 0;
1066 mmu_context_bmap[2] = 0;
1067 mmu_context_bmap[3] = 0;
1068 for (i = 4; i < CTX_BMAP_SLOTS; i += 4) {
1069 mmu_context_bmap[i + 0] = 0;
1070 mmu_context_bmap[i + 1] = 0;
1071 mmu_context_bmap[i + 2] = 0;
1072 mmu_context_bmap[i + 3] = 0;
1073 }
1074 goto out;
1075 }
1076 }
1077 mmu_context_bmap[new_ctx>>6] |= (1UL << (new_ctx & 63));
1078 new_ctx |= (tlb_context_cache & CTX_VERSION_MASK);
1079 out:
1080 tlb_context_cache = new_ctx;
1081 mm->context.sparc64_ctx_val = new_ctx | orig_pgsz_bits;
1082 spin_unlock(&ctx_alloc_lock);
1083 }
1084
1085 #ifndef CONFIG_SMP
1086 struct pgtable_cache_struct pgt_quicklists;
1087 #endif
1088
1089 /* OK, we have to color these pages. The page tables are accessed
1090 * by non-Dcache enabled mapping in the VPTE area by the dtlb_backend.S
1091 * code, as well as by PAGE_OFFSET range direct-mapped addresses by
1092 * other parts of the kernel. By coloring, we make sure that the tlbmiss
1093 * fast handlers do not get data from old/garbage dcache lines that
1094 * correspond to an old/stale virtual address (user/kernel) that
1095 * previously mapped the pagetable page while accessing vpte range
1096 * addresses. The idea is that if the vpte color and PAGE_OFFSET range
1097 * color is the same, then when the kernel initializes the pagetable
1098 * using the later address range, accesses with the first address
1099 * range will see the newly initialized data rather than the garbage.
1100 */
1101 #ifdef DCACHE_ALIASING_POSSIBLE
1102 #define DC_ALIAS_SHIFT 1
1103 #else
1104 #define DC_ALIAS_SHIFT 0
1105 #endif
1106 pte_t *__pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)
1107 {
1108 struct page *page;
1109 unsigned long color;
1110
1111 {
1112 pte_t *ptep = pte_alloc_one_fast(mm, address);
1113
1114 if (ptep)
1115 return ptep;
1116 }
1117
1118 color = VPTE_COLOR(address);
1119 page = alloc_pages(GFP_KERNEL|__GFP_REPEAT, DC_ALIAS_SHIFT);
1120 if (page) {
1121 unsigned long *to_free;
1122 unsigned long paddr;
1123 pte_t *pte;
1124
1125 #ifdef DCACHE_ALIASING_POSSIBLE
1126 set_page_count(page, 1);
1127 ClearPageCompound(page);
1128
1129 set_page_count((page + 1), 1);
1130 ClearPageCompound(page + 1);
1131 #endif
1132 paddr = (unsigned long) page_address(page);
1133 memset((char *)paddr, 0, (PAGE_SIZE << DC_ALIAS_SHIFT));
1134
1135 if (!color) {
1136 pte = (pte_t *) paddr;
1137 to_free = (unsigned long *) (paddr + PAGE_SIZE);
1138 } else {
1139 pte = (pte_t *) (paddr + PAGE_SIZE);
1140 to_free = (unsigned long *) paddr;
1141 }
1142
1143 #ifdef DCACHE_ALIASING_POSSIBLE
1144 /* Now free the other one up, adjust cache size. */
1145 preempt_disable();
1146 *to_free = (unsigned long) pte_quicklist[color ^ 0x1];
1147 pte_quicklist[color ^ 0x1] = to_free;
1148 pgtable_cache_size++;
1149 preempt_enable();
1150 #endif
1151
1152 return pte;
1153 }
1154 return NULL;
1155 }
1156
1157 void sparc_ultra_dump_itlb(void)
1158 {
1159 int slot;
1160
1161 if (tlb_type == spitfire) {
1162 printk ("Contents of itlb: ");
1163 for (slot = 0; slot < 14; slot++) printk (" ");
1164 printk ("%2x:%016lx,%016lx\n",
1165 0,
1166 spitfire_get_itlb_tag(0), spitfire_get_itlb_data(0));
1167 for (slot = 1; slot < 64; slot+=3) {
1168 printk ("%2x:%016lx,%016lx %2x:%016lx,%016lx %2x:%016lx,%016lx\n",
1169 slot,
1170 spitfire_get_itlb_tag(slot), spitfire_get_itlb_data(slot),
1171 slot+1,
1172 spitfire_get_itlb_tag(slot+1), spitfire_get_itlb_data(slot+1),
1173 slot+2,
1174 spitfire_get_itlb_tag(slot+2), spitfire_get_itlb_data(slot+2));
1175 }
1176 } else if (tlb_type == cheetah || tlb_type == cheetah_plus) {
1177 printk ("Contents of itlb0:\n");
1178 for (slot = 0; slot < 16; slot+=2) {
1179 printk ("%2x:%016lx,%016lx %2x:%016lx,%016lx\n",
1180 slot,
1181 cheetah_get_litlb_tag(slot), cheetah_get_litlb_data(slot),
1182 slot+1,
1183 cheetah_get_litlb_tag(slot+1), cheetah_get_litlb_data(slot+1));
1184 }
1185 printk ("Contents of itlb2:\n");
1186 for (slot = 0; slot < 128; slot+=2) {
1187 printk ("%2x:%016lx,%016lx %2x:%016lx,%016lx\n",
1188 slot,
1189 cheetah_get_itlb_tag(slot), cheetah_get_itlb_data(slot),
1190 slot+1,
1191 cheetah_get_itlb_tag(slot+1), cheetah_get_itlb_data(slot+1));
1192 }
1193 }
1194 }
1195
1196 void sparc_ultra_dump_dtlb(void)
1197 {
1198 int slot;
1199
1200 if (tlb_type == spitfire) {
1201 printk ("Contents of dtlb: ");
1202 for (slot = 0; slot < 14; slot++) printk (" ");
1203 printk ("%2x:%016lx,%016lx\n", 0,
1204 spitfire_get_dtlb_tag(0), spitfire_get_dtlb_data(0));
1205 for (slot = 1; slot < 64; slot+=3) {
1206 printk ("%2x:%016lx,%016lx %2x:%016lx,%016lx %2x:%016lx,%016lx\n",
1207 slot,
1208 spitfire_get_dtlb_tag(slot), spitfire_get_dtlb_data(slot),
1209 slot+1,
1210 spitfire_get_dtlb_tag(slot+1), spitfire_get_dtlb_data(slot+1),
1211 slot+2,
1212 spitfire_get_dtlb_tag(slot+2), spitfire_get_dtlb_data(slot+2));
1213 }
1214 } else if (tlb_type == cheetah || tlb_type == cheetah_plus) {
1215 printk ("Contents of dtlb0:\n");
1216 for (slot = 0; slot < 16; slot+=2) {
1217 printk ("%2x:%016lx,%016lx %2x:%016lx,%016lx\n",
1218 slot,
1219 cheetah_get_ldtlb_tag(slot), cheetah_get_ldtlb_data(slot),
1220 slot+1,
1221 cheetah_get_ldtlb_tag(slot+1), cheetah_get_ldtlb_data(slot+1));
1222 }
1223 printk ("Contents of dtlb2:\n");
1224 for (slot = 0; slot < 512; slot+=2) {
1225 printk ("%2x:%016lx,%016lx %2x:%016lx,%016lx\n",
1226 slot,
1227 cheetah_get_dtlb_tag(slot, 2), cheetah_get_dtlb_data(slot, 2),
1228 slot+1,
1229 cheetah_get_dtlb_tag(slot+1, 2), cheetah_get_dtlb_data(slot+1, 2));
1230 }
1231 if (tlb_type == cheetah_plus) {
1232 printk ("Contents of dtlb3:\n");
1233 for (slot = 0; slot < 512; slot+=2) {
1234 printk ("%2x:%016lx,%016lx %2x:%016lx,%016lx\n",
1235 slot,
1236 cheetah_get_dtlb_tag(slot, 3), cheetah_get_dtlb_data(slot, 3),
1237 slot+1,
1238 cheetah_get_dtlb_tag(slot+1, 3), cheetah_get_dtlb_data(slot+1, 3));
1239 }
1240 }
1241 }
1242 }
1243
1244 extern unsigned long cmdline_memory_size;
1245
1246 unsigned long __init bootmem_init(unsigned long *pages_avail)
1247 {
1248 unsigned long bootmap_size, start_pfn, end_pfn;
1249 unsigned long end_of_phys_memory = 0UL;
1250 unsigned long bootmap_pfn, bytes_avail, size;
1251 int i;
1252
1253 #ifdef CONFIG_DEBUG_BOOTMEM
1254 prom_printf("bootmem_init: Scan sp_banks, ");
1255 #endif
1256
1257 bytes_avail = 0UL;
1258 for (i = 0; sp_banks[i].num_bytes != 0; i++) {
1259 end_of_phys_memory = sp_banks[i].base_addr +
1260 sp_banks[i].num_bytes;
1261 bytes_avail += sp_banks[i].num_bytes;
1262 if (cmdline_memory_size) {
1263 if (bytes_avail > cmdline_memory_size) {
1264 unsigned long slack = bytes_avail - cmdline_memory_size;
1265
1266 bytes_avail -= slack;
1267 end_of_phys_memory -= slack;
1268
1269 sp_banks[i].num_bytes -= slack;
1270 if (sp_banks[i].num_bytes == 0) {
1271 sp_banks[i].base_addr = 0xdeadbeef;
1272 } else {
1273 sp_banks[i+1].num_bytes = 0;
1274 sp_banks[i+1].base_addr = 0xdeadbeef;
1275 }
1276 break;
1277 }
1278 }
1279 }
1280
1281 *pages_avail = bytes_avail >> PAGE_SHIFT;
1282
1283 /* Start with page aligned address of last symbol in kernel
1284 * image. The kernel is hard mapped below PAGE_OFFSET in a
1285 * 4MB locked TLB translation.
1286 */
1287 start_pfn = PAGE_ALIGN(kern_base + kern_size) >> PAGE_SHIFT;
1288
1289 bootmap_pfn = start_pfn;
1290
1291 end_pfn = end_of_phys_memory >> PAGE_SHIFT;
1292
1293 #ifdef CONFIG_BLK_DEV_INITRD
1294 /* Now have to check initial ramdisk, so that bootmap does not overwrite it */
1295 if (sparc_ramdisk_image || sparc_ramdisk_image64) {
1296 unsigned long ramdisk_image = sparc_ramdisk_image ?
1297 sparc_ramdisk_image : sparc_ramdisk_image64;
1298 if (ramdisk_image >= (unsigned long)_end - 2 * PAGE_SIZE)
1299 ramdisk_image -= KERNBASE;
1300 initrd_start = ramdisk_image + phys_base;
1301 initrd_end = initrd_start + sparc_ramdisk_size;
1302 if (initrd_end > end_of_phys_memory) {
1303 printk(KERN_CRIT "initrd extends beyond end of memory "
1304 "(0x%016lx > 0x%016lx)\ndisabling initrd\n",
1305 initrd_end, end_of_phys_memory);
1306 initrd_start = 0;
1307 }
1308 if (initrd_start) {
1309 if (initrd_start >= (start_pfn << PAGE_SHIFT) &&
1310 initrd_start < (start_pfn << PAGE_SHIFT) + 2 * PAGE_SIZE)
1311 bootmap_pfn = PAGE_ALIGN (initrd_end) >> PAGE_SHIFT;
1312 }
1313 }
1314 #endif
1315 /* Initialize the boot-time allocator. */
1316 max_pfn = max_low_pfn = end_pfn;
1317 min_low_pfn = pfn_base;
1318
1319 #ifdef CONFIG_DEBUG_BOOTMEM
1320 prom_printf("init_bootmem(min[%lx], bootmap[%lx], max[%lx])\n",
1321 min_low_pfn, bootmap_pfn, max_low_pfn);
1322 #endif
1323 bootmap_size = init_bootmem_node(NODE_DATA(0), bootmap_pfn, pfn_base, end_pfn);
1324
1325 bootmap_base = bootmap_pfn << PAGE_SHIFT;
1326
1327 /* Now register the available physical memory with the
1328 * allocator.
1329 */
1330 for (i = 0; sp_banks[i].num_bytes != 0; i++) {
1331 #ifdef CONFIG_DEBUG_BOOTMEM
1332 prom_printf("free_bootmem(sp_banks:%d): base[%lx] size[%lx]\n",
1333 i, sp_banks[i].base_addr, sp_banks[i].num_bytes);
1334 #endif
1335 free_bootmem(sp_banks[i].base_addr, sp_banks[i].num_bytes);
1336 }
1337
1338 #ifdef CONFIG_BLK_DEV_INITRD
1339 if (initrd_start) {
1340 size = initrd_end - initrd_start;
1341
1342 /* Resert the initrd image area. */
1343 #ifdef CONFIG_DEBUG_BOOTMEM
1344 prom_printf("reserve_bootmem(initrd): base[%llx] size[%lx]\n",
1345 initrd_start, initrd_end);
1346 #endif
1347 reserve_bootmem(initrd_start, size);
1348 *pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
1349
1350 initrd_start += PAGE_OFFSET;
1351 initrd_end += PAGE_OFFSET;
1352 }
1353 #endif
1354 /* Reserve the kernel text/data/bss. */
1355 #ifdef CONFIG_DEBUG_BOOTMEM
1356 prom_printf("reserve_bootmem(kernel): base[%lx] size[%lx]\n", kern_base, kern_size);
1357 #endif
1358 reserve_bootmem(kern_base, kern_size);
1359 *pages_avail -= PAGE_ALIGN(kern_size) >> PAGE_SHIFT;
1360
1361 /* Reserve the bootmem map. We do not account for it
1362 * in pages_avail because we will release that memory
1363 * in free_all_bootmem.
1364 */
1365 size = bootmap_size;
1366 #ifdef CONFIG_DEBUG_BOOTMEM
1367 prom_printf("reserve_bootmem(bootmap): base[%lx] size[%lx]\n",
1368 (bootmap_pfn << PAGE_SHIFT), size);
1369 #endif
1370 reserve_bootmem((bootmap_pfn << PAGE_SHIFT), size);
1371 *pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
1372
1373 return end_pfn;
1374 }
1375
1376 /* paging_init() sets up the page tables */
1377
1378 extern void cheetah_ecache_flush_init(void);
1379
1380 static unsigned long last_valid_pfn;
1381
1382 void __init paging_init(void)
1383 {
1384 extern pmd_t swapper_pmd_dir[1024];
1385 extern unsigned int sparc64_vpte_patchme1[1];
1386 extern unsigned int sparc64_vpte_patchme2[1];
1387 unsigned long alias_base = kern_base + PAGE_OFFSET;
1388 unsigned long second_alias_page = 0;
1389 unsigned long pt, flags, end_pfn, pages_avail;
1390 unsigned long shift = alias_base - ((unsigned long)KERNBASE);
1391 unsigned long real_end;
1392
1393 set_bit(0, mmu_context_bmap);
1394
1395 real_end = (unsigned long)_end;
1396 if ((real_end > ((unsigned long)KERNBASE + 0x400000)))
1397 bigkernel = 1;
1398 #ifdef CONFIG_BLK_DEV_INITRD
1399 if (sparc_ramdisk_image || sparc_ramdisk_image64)
1400 real_end = (PAGE_ALIGN(real_end) + PAGE_ALIGN(sparc_ramdisk_size));
1401 #endif
1402
1403 /* We assume physical memory starts at some 4mb multiple,
1404 * if this were not true we wouldn't boot up to this point
1405 * anyways.
1406 */
1407 pt = kern_base | _PAGE_VALID | _PAGE_SZ4MB;
1408 pt |= _PAGE_CP | _PAGE_CV | _PAGE_P | _PAGE_L | _PAGE_W;
1409 local_irq_save(flags);
1410 if (tlb_type == spitfire) {
1411 __asm__ __volatile__(
1412 " stxa %1, [%0] %3\n"
1413 " stxa %2, [%5] %4\n"
1414 " membar #Sync\n"
1415 " flush %%g6\n"
1416 " nop\n"
1417 " nop\n"
1418 " nop\n"
1419 : /* No outputs */
1420 : "r" (TLB_TAG_ACCESS), "r" (alias_base), "r" (pt),
1421 "i" (ASI_DMMU), "i" (ASI_DTLB_DATA_ACCESS), "r" (61 << 3)
1422 : "memory");
1423 if (real_end >= KERNBASE + 0x340000) {
1424 second_alias_page = alias_base + 0x400000;
1425 __asm__ __volatile__(
1426 " stxa %1, [%0] %3\n"
1427 " stxa %2, [%5] %4\n"
1428 " membar #Sync\n"
1429 " flush %%g6\n"
1430 " nop\n"
1431 " nop\n"
1432 " nop\n"
1433 : /* No outputs */
1434 : "r" (TLB_TAG_ACCESS), "r" (second_alias_page), "r" (pt + 0x400000),
1435 "i" (ASI_DMMU), "i" (ASI_DTLB_DATA_ACCESS), "r" (60 << 3)
1436 : "memory");
1437 }
1438 } else if (tlb_type == cheetah || tlb_type == cheetah_plus) {
1439 __asm__ __volatile__(
1440 " stxa %1, [%0] %3\n"
1441 " stxa %2, [%5] %4\n"
1442 " membar #Sync\n"
1443 " flush %%g6\n"
1444 " nop\n"
1445 " nop\n"
1446 " nop\n"
1447 : /* No outputs */
1448 : "r" (TLB_TAG_ACCESS), "r" (alias_base), "r" (pt),
1449 "i" (ASI_DMMU), "i" (ASI_DTLB_DATA_ACCESS), "r" ((0<<16) | (13<<3))
1450 : "memory");
1451 if (real_end >= KERNBASE + 0x340000) {
1452 second_alias_page = alias_base + 0x400000;
1453 __asm__ __volatile__(
1454 " stxa %1, [%0] %3\n"
1455 " stxa %2, [%5] %4\n"
1456 " membar #Sync\n"
1457 " flush %%g6\n"
1458 " nop\n"
1459 " nop\n"
1460 " nop\n"
1461 : /* No outputs */
1462 : "r" (TLB_TAG_ACCESS), "r" (second_alias_page), "r" (pt + 0x400000),
1463 "i" (ASI_DMMU), "i" (ASI_DTLB_DATA_ACCESS), "r" ((0<<16) | (12<<3))
1464 : "memory");
1465 }
1466 }
1467 local_irq_restore(flags);
1468
1469 /* Now set kernel pgd to upper alias so physical page computations
1470 * work.
1471 */
1472 init_mm.pgd += ((shift) / (sizeof(pgd_t)));
1473
1474 memset(swapper_pmd_dir, 0, sizeof(swapper_pmd_dir));
1475
1476 /* Now can init the kernel/bad page tables. */
1477 pud_set(pud_offset(&swapper_pg_dir[0], 0),
1478 swapper_pmd_dir + (shift / sizeof(pgd_t)));
1479
1480 sparc64_vpte_patchme1[0] |=
1481 (((unsigned long)pgd_val(init_mm.pgd[0])) >> 10);
1482 sparc64_vpte_patchme2[0] |=
1483 (((unsigned long)pgd_val(init_mm.pgd[0])) & 0x3ff);
1484 flushi((long)&sparc64_vpte_patchme1[0]);
1485
1486 /* Setup bootmem... */
1487 pages_avail = 0;
1488 last_valid_pfn = end_pfn = bootmem_init(&pages_avail);
1489
1490 /* Inherit non-locked OBP mappings. */
1491 inherit_prom_mappings();
1492
1493 /* Ok, we can use our TLB miss and window trap handlers safely.
1494 * We need to do a quick peek here to see if we are on StarFire
1495 * or not, so setup_tba can setup the IRQ globals correctly (it
1496 * needs to get the hard smp processor id correctly).
1497 */
1498 {
1499 extern void setup_tba(int);
1500 setup_tba(this_is_starfire);
1501 }
1502
1503 inherit_locked_prom_mappings(1);
1504
1505 /* We only created DTLB mapping of this stuff. */
1506 spitfire_flush_dtlb_nucleus_page(alias_base);
1507 if (second_alias_page)
1508 spitfire_flush_dtlb_nucleus_page(second_alias_page);
1509
1510 __flush_tlb_all();
1511
1512 {
1513 unsigned long zones_size[MAX_NR_ZONES];
1514 unsigned long zholes_size[MAX_NR_ZONES];
1515 unsigned long npages;
1516 int znum;
1517
1518 for (znum = 0; znum < MAX_NR_ZONES; znum++)
1519 zones_size[znum] = zholes_size[znum] = 0;
1520
1521 npages = end_pfn - pfn_base;
1522 zones_size[ZONE_DMA] = npages;
1523 zholes_size[ZONE_DMA] = npages - pages_avail;
1524
1525 free_area_init_node(0, &contig_page_data, zones_size,
1526 phys_base >> PAGE_SHIFT, zholes_size);
1527 }
1528
1529 device_scan();
1530 }
1531
1532 /* Ok, it seems that the prom can allocate some more memory chunks
1533 * as a side effect of some prom calls we perform during the
1534 * boot sequence. My most likely theory is that it is from the
1535 * prom_set_traptable() call, and OBP is allocating a scratchpad
1536 * for saving client program register state etc.
1537 */
1538 static void __init sort_memlist(struct linux_mlist_p1275 *thislist)
1539 {
1540 int swapi = 0;
1541 int i, mitr;
1542 unsigned long tmpaddr, tmpsize;
1543 unsigned long lowest;
1544
1545 for (i = 0; thislist[i].theres_more != 0; i++) {
1546 lowest = thislist[i].start_adr;
1547 for (mitr = i+1; thislist[mitr-1].theres_more != 0; mitr++)
1548 if (thislist[mitr].start_adr < lowest) {
1549 lowest = thislist[mitr].start_adr;
1550 swapi = mitr;
1551 }
1552 if (lowest == thislist[i].start_adr)
1553 continue;
1554 tmpaddr = thislist[swapi].start_adr;
1555 tmpsize = thislist[swapi].num_bytes;
1556 for (mitr = swapi; mitr > i; mitr--) {
1557 thislist[mitr].start_adr = thislist[mitr-1].start_adr;
1558 thislist[mitr].num_bytes = thislist[mitr-1].num_bytes;
1559 }
1560 thislist[i].start_adr = tmpaddr;
1561 thislist[i].num_bytes = tmpsize;
1562 }
1563 }
1564
1565 void __init rescan_sp_banks(void)
1566 {
1567 struct linux_prom64_registers memlist[64];
1568 struct linux_mlist_p1275 avail[64], *mlist;
1569 unsigned long bytes, base_paddr;
1570 int num_regs, node = prom_finddevice("/memory");
1571 int i;
1572
1573 num_regs = prom_getproperty(node, "available",
1574 (char *) memlist, sizeof(memlist));
1575 num_regs = (num_regs / sizeof(struct linux_prom64_registers));
1576 for (i = 0; i < num_regs; i++) {
1577 avail[i].start_adr = memlist[i].phys_addr;
1578 avail[i].num_bytes = memlist[i].reg_size;
1579 avail[i].theres_more = &avail[i + 1];
1580 }
1581 avail[i - 1].theres_more = NULL;
1582 sort_memlist(avail);
1583
1584 mlist = &avail[0];
1585 i = 0;
1586 bytes = mlist->num_bytes;
1587 base_paddr = mlist->start_adr;
1588
1589 sp_banks[0].base_addr = base_paddr;
1590 sp_banks[0].num_bytes = bytes;
1591
1592 while (mlist->theres_more != NULL){
1593 i++;
1594 mlist = mlist->theres_more;
1595 bytes = mlist->num_bytes;
1596 if (i >= SPARC_PHYS_BANKS-1) {
1597 printk ("The machine has more banks than "
1598 "this kernel can support\n"
1599 "Increase the SPARC_PHYS_BANKS "
1600 "setting (currently %d)\n",
1601 SPARC_PHYS_BANKS);
1602 i = SPARC_PHYS_BANKS-1;
1603 break;
1604 }
1605
1606 sp_banks[i].base_addr = mlist->start_adr;
1607 sp_banks[i].num_bytes = mlist->num_bytes;
1608 }
1609
1610 i++;
1611 sp_banks[i].base_addr = 0xdeadbeefbeefdeadUL;
1612 sp_banks[i].num_bytes = 0;
1613
1614 for (i = 0; sp_banks[i].num_bytes != 0; i++)
1615 sp_banks[i].num_bytes &= PAGE_MASK;
1616 }
1617
1618 static void __init taint_real_pages(void)
1619 {
1620 struct sparc_phys_banks saved_sp_banks[SPARC_PHYS_BANKS];
1621 int i;
1622
1623 for (i = 0; i < SPARC_PHYS_BANKS; i++) {
1624 saved_sp_banks[i].base_addr =
1625 sp_banks[i].base_addr;
1626 saved_sp_banks[i].num_bytes =
1627 sp_banks[i].num_bytes;
1628 }
1629
1630 rescan_sp_banks();
1631
1632 /* Find changes discovered in the sp_bank rescan and
1633 * reserve the lost portions in the bootmem maps.
1634 */
1635 for (i = 0; saved_sp_banks[i].num_bytes; i++) {
1636 unsigned long old_start, old_end;
1637
1638 old_start = saved_sp_banks[i].base_addr;
1639 old_end = old_start +
1640 saved_sp_banks[i].num_bytes;
1641 while (old_start < old_end) {
1642 int n;
1643
1644 for (n = 0; sp_banks[n].num_bytes; n++) {
1645 unsigned long new_start, new_end;
1646
1647 new_start = sp_banks[n].base_addr;
1648 new_end = new_start + sp_banks[n].num_bytes;
1649
1650 if (new_start <= old_start &&
1651 new_end >= (old_start + PAGE_SIZE)) {
1652 set_bit (old_start >> 22,
1653 sparc64_valid_addr_bitmap);
1654 goto do_next_page;
1655 }
1656 }
1657 reserve_bootmem(old_start, PAGE_SIZE);
1658
1659 do_next_page:
1660 old_start += PAGE_SIZE;
1661 }
1662 }
1663 }
1664
1665 void __init mem_init(void)
1666 {
1667 unsigned long codepages, datapages, initpages;
1668 unsigned long addr, last;
1669 int i;
1670
1671 i = last_valid_pfn >> ((22 - PAGE_SHIFT) + 6);
1672 i += 1;
1673 sparc64_valid_addr_bitmap = (unsigned long *)
1674 __alloc_bootmem(i << 3, SMP_CACHE_BYTES, bootmap_base);
1675 if (sparc64_valid_addr_bitmap == NULL) {
1676 prom_printf("mem_init: Cannot alloc valid_addr_bitmap.\n");
1677 prom_halt();
1678 }
1679 memset(sparc64_valid_addr_bitmap, 0, i << 3);
1680
1681 addr = PAGE_OFFSET + kern_base;
1682 last = PAGE_ALIGN(kern_size) + addr;
1683 while (addr < last) {
1684 set_bit(__pa(addr) >> 22, sparc64_valid_addr_bitmap);
1685 addr += PAGE_SIZE;
1686 }
1687
1688 taint_real_pages();
1689
1690 max_mapnr = last_valid_pfn - pfn_base;
1691 high_memory = __va(last_valid_pfn << PAGE_SHIFT);
1692
1693 #ifdef CONFIG_DEBUG_BOOTMEM
1694 prom_printf("mem_init: Calling free_all_bootmem().\n");
1695 #endif
1696 totalram_pages = num_physpages = free_all_bootmem() - 1;
1697
1698 /*
1699 * Set up the zero page, mark it reserved, so that page count
1700 * is not manipulated when freeing the page from user ptes.
1701 */
1702 mem_map_zero = alloc_pages(GFP_KERNEL|__GFP_ZERO, 0);
1703 if (mem_map_zero == NULL) {
1704 prom_printf("paging_init: Cannot alloc zero page.\n");
1705 prom_halt();
1706 }
1707 SetPageReserved(mem_map_zero);
1708
1709 codepages = (((unsigned long) _etext) - ((unsigned long) _start));
1710 codepages = PAGE_ALIGN(codepages) >> PAGE_SHIFT;
1711 datapages = (((unsigned long) _edata) - ((unsigned long) _etext));
1712 datapages = PAGE_ALIGN(datapages) >> PAGE_SHIFT;
1713 initpages = (((unsigned long) __init_end) - ((unsigned long) __init_begin));
1714 initpages = PAGE_ALIGN(initpages) >> PAGE_SHIFT;
1715
1716 printk("Memory: %uk available (%ldk kernel code, %ldk data, %ldk init) [%016lx,%016lx]\n",
1717 nr_free_pages() << (PAGE_SHIFT-10),
1718 codepages << (PAGE_SHIFT-10),
1719 datapages << (PAGE_SHIFT-10),
1720 initpages << (PAGE_SHIFT-10),
1721 PAGE_OFFSET, (last_valid_pfn << PAGE_SHIFT));
1722
1723 if (tlb_type == cheetah || tlb_type == cheetah_plus)
1724 cheetah_ecache_flush_init();
1725 }
1726
1727 void free_initmem (void)
1728 {
1729 unsigned long addr, initend;
1730
1731 /*
1732 * The init section is aligned to 8k in vmlinux.lds. Page align for >8k pagesizes.
1733 */
1734 addr = PAGE_ALIGN((unsigned long)(__init_begin));
1735 initend = (unsigned long)(__init_end) & PAGE_MASK;
1736 for (; addr < initend; addr += PAGE_SIZE) {
1737 unsigned long page;
1738 struct page *p;
1739
1740 page = (addr +
1741 ((unsigned long) __va(kern_base)) -
1742 ((unsigned long) KERNBASE));
1743 memset((void *)addr, 0xcc, PAGE_SIZE);
1744 p = virt_to_page(page);
1745
1746 ClearPageReserved(p);
1747 set_page_count(p, 1);
1748 __free_page(p);
1749 num_physpages++;
1750 totalram_pages++;
1751 }
1752 }
1753
1754 #ifdef CONFIG_BLK_DEV_INITRD
1755 void free_initrd_mem(unsigned long start, unsigned long end)
1756 {
1757 if (start < end)
1758 printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
1759 for (; start < end; start += PAGE_SIZE) {
1760 struct page *p = virt_to_page(start);
1761
1762 ClearPageReserved(p);
1763 set_page_count(p, 1);
1764 __free_page(p);
1765 num_physpages++;
1766 totalram_pages++;
1767 }
1768 }
1769 #endif
kernel source for telekom puls (alcatel/mediatek)