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sparc32: centralize all mmu context handling in srmmu.c
[deliverable/linux.git] / arch / sparc / mm / init_32.c
1 /*
2 * linux/arch/sparc/mm/init.c
3 *
4 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
5 * Copyright (C) 1995 Eddie C. Dost (ecd@skynet.be)
6 * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
7 * Copyright (C) 2000 Anton Blanchard (anton@samba.org)
8 */
9
10 #include <linux/module.h>
11 #include <linux/signal.h>
12 #include <linux/sched.h>
13 #include <linux/kernel.h>
14 #include <linux/errno.h>
15 #include <linux/string.h>
16 #include <linux/types.h>
17 #include <linux/ptrace.h>
18 #include <linux/mman.h>
19 #include <linux/mm.h>
20 #include <linux/swap.h>
21 #include <linux/initrd.h>
22 #include <linux/init.h>
23 #include <linux/highmem.h>
24 #include <linux/bootmem.h>
25 #include <linux/pagemap.h>
26 #include <linux/poison.h>
27 #include <linux/gfp.h>
28
29 #include <asm/sections.h>
30 #include <asm/page.h>
31 #include <asm/pgtable.h>
32 #include <asm/vaddrs.h>
33 #include <asm/pgalloc.h> /* bug in asm-generic/tlb.h: check_pgt_cache */
34 #include <asm/tlb.h>
35 #include <asm/prom.h>
36 #include <asm/leon.h>
37
38 unsigned long *sparc_valid_addr_bitmap;
39 EXPORT_SYMBOL(sparc_valid_addr_bitmap);
40
41 unsigned long phys_base;
42 EXPORT_SYMBOL(phys_base);
43
44 unsigned long pfn_base;
45 EXPORT_SYMBOL(pfn_base);
46
47 struct sparc_phys_banks sp_banks[SPARC_PHYS_BANKS+1];
48
49 /* Initial ramdisk setup */
50 extern unsigned int sparc_ramdisk_image;
51 extern unsigned int sparc_ramdisk_size;
52
53 unsigned long highstart_pfn, highend_pfn;
54
55 pte_t *kmap_pte;
56 pgprot_t kmap_prot;
57
58 #define kmap_get_fixmap_pte(vaddr) \
59 pte_offset_kernel(pmd_offset(pgd_offset_k(vaddr), (vaddr)), (vaddr))
60
61 void __init kmap_init(void)
62 {
63 /* cache the first kmap pte */
64 kmap_pte = kmap_get_fixmap_pte(__fix_to_virt(FIX_KMAP_BEGIN));
65 kmap_prot = __pgprot(SRMMU_ET_PTE | SRMMU_PRIV | SRMMU_CACHE);
66 }
67
68 void show_mem(unsigned int filter)
69 {
70 printk("Mem-info:\n");
71 show_free_areas(filter);
72 printk("Free swap: %6ldkB\n",
73 nr_swap_pages << (PAGE_SHIFT-10));
74 printk("%ld pages of RAM\n", totalram_pages);
75 printk("%ld free pages\n", nr_free_pages());
76 #if 0 /* undefined pgtable_cache_size, pgd_cache_size */
77 printk("%ld pages in page table cache\n",pgtable_cache_size);
78 #ifndef CONFIG_SMP
79 if (sparc_cpu_model == sun4m || sparc_cpu_model == sun4d)
80 printk("%ld entries in page dir cache\n",pgd_cache_size);
81 #endif
82 #endif
83 }
84
85
86 extern unsigned long cmdline_memory_size;
87 unsigned long last_valid_pfn;
88
89 unsigned long calc_highpages(void)
90 {
91 int i;
92 int nr = 0;
93
94 for (i = 0; sp_banks[i].num_bytes != 0; i++) {
95 unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
96 unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
97
98 if (end_pfn <= max_low_pfn)
99 continue;
100
101 if (start_pfn < max_low_pfn)
102 start_pfn = max_low_pfn;
103
104 nr += end_pfn - start_pfn;
105 }
106
107 return nr;
108 }
109
110 static unsigned long calc_max_low_pfn(void)
111 {
112 int i;
113 unsigned long tmp = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT);
114 unsigned long curr_pfn, last_pfn;
115
116 last_pfn = (sp_banks[0].base_addr + sp_banks[0].num_bytes) >> PAGE_SHIFT;
117 for (i = 1; sp_banks[i].num_bytes != 0; i++) {
118 curr_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
119
120 if (curr_pfn >= tmp) {
121 if (last_pfn < tmp)
122 tmp = last_pfn;
123 break;
124 }
125
126 last_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
127 }
128
129 return tmp;
130 }
131
132 unsigned long __init bootmem_init(unsigned long *pages_avail)
133 {
134 unsigned long bootmap_size, start_pfn;
135 unsigned long end_of_phys_memory = 0UL;
136 unsigned long bootmap_pfn, bytes_avail, size;
137 int i;
138
139 bytes_avail = 0UL;
140 for (i = 0; sp_banks[i].num_bytes != 0; i++) {
141 end_of_phys_memory = sp_banks[i].base_addr +
142 sp_banks[i].num_bytes;
143 bytes_avail += sp_banks[i].num_bytes;
144 if (cmdline_memory_size) {
145 if (bytes_avail > cmdline_memory_size) {
146 unsigned long slack = bytes_avail - cmdline_memory_size;
147
148 bytes_avail -= slack;
149 end_of_phys_memory -= slack;
150
151 sp_banks[i].num_bytes -= slack;
152 if (sp_banks[i].num_bytes == 0) {
153 sp_banks[i].base_addr = 0xdeadbeef;
154 } else {
155 sp_banks[i+1].num_bytes = 0;
156 sp_banks[i+1].base_addr = 0xdeadbeef;
157 }
158 break;
159 }
160 }
161 }
162
163 /* Start with page aligned address of last symbol in kernel
164 * image.
165 */
166 start_pfn = (unsigned long)__pa(PAGE_ALIGN((unsigned long) &_end));
167
168 /* Now shift down to get the real physical page frame number. */
169 start_pfn >>= PAGE_SHIFT;
170
171 bootmap_pfn = start_pfn;
172
173 max_pfn = end_of_phys_memory >> PAGE_SHIFT;
174
175 max_low_pfn = max_pfn;
176 highstart_pfn = highend_pfn = max_pfn;
177
178 if (max_low_pfn > pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT)) {
179 highstart_pfn = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT);
180 max_low_pfn = calc_max_low_pfn();
181 printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
182 calc_highpages() >> (20 - PAGE_SHIFT));
183 }
184
185 #ifdef CONFIG_BLK_DEV_INITRD
186 /* Now have to check initial ramdisk, so that bootmap does not overwrite it */
187 if (sparc_ramdisk_image) {
188 if (sparc_ramdisk_image >= (unsigned long)&_end - 2 * PAGE_SIZE)
189 sparc_ramdisk_image -= KERNBASE;
190 initrd_start = sparc_ramdisk_image + phys_base;
191 initrd_end = initrd_start + sparc_ramdisk_size;
192 if (initrd_end > end_of_phys_memory) {
193 printk(KERN_CRIT "initrd extends beyond end of memory "
194 "(0x%016lx > 0x%016lx)\ndisabling initrd\n",
195 initrd_end, end_of_phys_memory);
196 initrd_start = 0;
197 }
198 if (initrd_start) {
199 if (initrd_start >= (start_pfn << PAGE_SHIFT) &&
200 initrd_start < (start_pfn << PAGE_SHIFT) + 2 * PAGE_SIZE)
201 bootmap_pfn = PAGE_ALIGN (initrd_end) >> PAGE_SHIFT;
202 }
203 }
204 #endif
205 /* Initialize the boot-time allocator. */
206 bootmap_size = init_bootmem_node(NODE_DATA(0), bootmap_pfn, pfn_base,
207 max_low_pfn);
208
209 /* Now register the available physical memory with the
210 * allocator.
211 */
212 *pages_avail = 0;
213 for (i = 0; sp_banks[i].num_bytes != 0; i++) {
214 unsigned long curr_pfn, last_pfn;
215
216 curr_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
217 if (curr_pfn >= max_low_pfn)
218 break;
219
220 last_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
221 if (last_pfn > max_low_pfn)
222 last_pfn = max_low_pfn;
223
224 /*
225 * .. finally, did all the rounding and playing
226 * around just make the area go away?
227 */
228 if (last_pfn <= curr_pfn)
229 continue;
230
231 size = (last_pfn - curr_pfn) << PAGE_SHIFT;
232 *pages_avail += last_pfn - curr_pfn;
233
234 free_bootmem(sp_banks[i].base_addr, size);
235 }
236
237 #ifdef CONFIG_BLK_DEV_INITRD
238 if (initrd_start) {
239 /* Reserve the initrd image area. */
240 size = initrd_end - initrd_start;
241 reserve_bootmem(initrd_start, size, BOOTMEM_DEFAULT);
242 *pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
243
244 initrd_start = (initrd_start - phys_base) + PAGE_OFFSET;
245 initrd_end = (initrd_end - phys_base) + PAGE_OFFSET;
246 }
247 #endif
248 /* Reserve the kernel text/data/bss. */
249 size = (start_pfn << PAGE_SHIFT) - phys_base;
250 reserve_bootmem(phys_base, size, BOOTMEM_DEFAULT);
251 *pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
252
253 /* Reserve the bootmem map. We do not account for it
254 * in pages_avail because we will release that memory
255 * in free_all_bootmem.
256 */
257 size = bootmap_size;
258 reserve_bootmem((bootmap_pfn << PAGE_SHIFT), size, BOOTMEM_DEFAULT);
259 *pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
260
261 return max_pfn;
262 }
263
264 /*
265 * paging_init() sets up the page tables: We call the MMU specific
266 * init routine based upon the Sun model type on the Sparc.
267 *
268 */
269 extern void srmmu_paging_init(void);
270 extern void device_scan(void);
271
272 void __init paging_init(void)
273 {
274 srmmu_paging_init();
275 prom_build_devicetree();
276 of_fill_in_cpu_data();
277 device_scan();
278 }
279
280 static void __init taint_real_pages(void)
281 {
282 int i;
283
284 for (i = 0; sp_banks[i].num_bytes; i++) {
285 unsigned long start, end;
286
287 start = sp_banks[i].base_addr;
288 end = start + sp_banks[i].num_bytes;
289
290 while (start < end) {
291 set_bit(start >> 20, sparc_valid_addr_bitmap);
292 start += PAGE_SIZE;
293 }
294 }
295 }
296
297 static void map_high_region(unsigned long start_pfn, unsigned long end_pfn)
298 {
299 unsigned long tmp;
300
301 #ifdef CONFIG_DEBUG_HIGHMEM
302 printk("mapping high region %08lx - %08lx\n", start_pfn, end_pfn);
303 #endif
304
305 for (tmp = start_pfn; tmp < end_pfn; tmp++) {
306 struct page *page = pfn_to_page(tmp);
307
308 ClearPageReserved(page);
309 init_page_count(page);
310 __free_page(page);
311 totalhigh_pages++;
312 }
313 }
314
315 void __init mem_init(void)
316 {
317 int codepages = 0;
318 int datapages = 0;
319 int initpages = 0;
320 int reservedpages = 0;
321 int i;
322
323 if (PKMAP_BASE+LAST_PKMAP*PAGE_SIZE >= FIXADDR_START) {
324 prom_printf("BUG: fixmap and pkmap areas overlap\n");
325 prom_printf("pkbase: 0x%lx pkend: 0x%lx fixstart 0x%lx\n",
326 PKMAP_BASE,
327 (unsigned long)PKMAP_BASE+LAST_PKMAP*PAGE_SIZE,
328 FIXADDR_START);
329 prom_printf("Please mail sparclinux@vger.kernel.org.\n");
330 prom_halt();
331 }
332
333
334 /* Saves us work later. */
335 memset((void *)&empty_zero_page, 0, PAGE_SIZE);
336
337 i = last_valid_pfn >> ((20 - PAGE_SHIFT) + 5);
338 i += 1;
339 sparc_valid_addr_bitmap = (unsigned long *)
340 __alloc_bootmem(i << 2, SMP_CACHE_BYTES, 0UL);
341
342 if (sparc_valid_addr_bitmap == NULL) {
343 prom_printf("mem_init: Cannot alloc valid_addr_bitmap.\n");
344 prom_halt();
345 }
346 memset(sparc_valid_addr_bitmap, 0, i << 2);
347
348 taint_real_pages();
349
350 max_mapnr = last_valid_pfn - pfn_base;
351 high_memory = __va(max_low_pfn << PAGE_SHIFT);
352
353 totalram_pages = free_all_bootmem();
354
355 for (i = 0; sp_banks[i].num_bytes != 0; i++) {
356 unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
357 unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
358
359 num_physpages += sp_banks[i].num_bytes >> PAGE_SHIFT;
360
361 if (end_pfn <= highstart_pfn)
362 continue;
363
364 if (start_pfn < highstart_pfn)
365 start_pfn = highstart_pfn;
366
367 map_high_region(start_pfn, end_pfn);
368 }
369
370 totalram_pages += totalhigh_pages;
371
372 codepages = (((unsigned long) &_etext) - ((unsigned long)&_start));
373 codepages = PAGE_ALIGN(codepages) >> PAGE_SHIFT;
374 datapages = (((unsigned long) &_edata) - ((unsigned long)&_etext));
375 datapages = PAGE_ALIGN(datapages) >> PAGE_SHIFT;
376 initpages = (((unsigned long) &__init_end) - ((unsigned long) &__init_begin));
377 initpages = PAGE_ALIGN(initpages) >> PAGE_SHIFT;
378
379 /* Ignore memory holes for the purpose of counting reserved pages */
380 for (i=0; i < max_low_pfn; i++)
381 if (test_bit(i >> (20 - PAGE_SHIFT), sparc_valid_addr_bitmap)
382 && PageReserved(pfn_to_page(i)))
383 reservedpages++;
384
385 printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, %dk reserved, %dk data, %dk init, %ldk highmem)\n",
386 nr_free_pages() << (PAGE_SHIFT-10),
387 num_physpages << (PAGE_SHIFT - 10),
388 codepages << (PAGE_SHIFT-10),
389 reservedpages << (PAGE_SHIFT - 10),
390 datapages << (PAGE_SHIFT-10),
391 initpages << (PAGE_SHIFT-10),
392 totalhigh_pages << (PAGE_SHIFT-10));
393 }
394
395 void free_initmem (void)
396 {
397 unsigned long addr;
398 unsigned long freed;
399
400 addr = (unsigned long)(&__init_begin);
401 freed = (unsigned long)(&__init_end) - addr;
402 for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
403 struct page *p;
404
405 memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE);
406 p = virt_to_page(addr);
407
408 ClearPageReserved(p);
409 init_page_count(p);
410 __free_page(p);
411 totalram_pages++;
412 num_physpages++;
413 }
414 printk(KERN_INFO "Freeing unused kernel memory: %ldk freed\n",
415 freed >> 10);
416 }
417
418 #ifdef CONFIG_BLK_DEV_INITRD
419 void free_initrd_mem(unsigned long start, unsigned long end)
420 {
421 if (start < end)
422 printk(KERN_INFO "Freeing initrd memory: %ldk freed\n",
423 (end - start) >> 10);
424 for (; start < end; start += PAGE_SIZE) {
425 struct page *p;
426
427 memset((void *)start, POISON_FREE_INITMEM, PAGE_SIZE);
428 p = virt_to_page(start);
429
430 ClearPageReserved(p);
431 init_page_count(p);
432 __free_page(p);
433 totalram_pages++;
434 num_physpages++;
435 }
436 }
437 #endif
438
439 void sparc_flush_page_to_ram(struct page *page)
440 {
441 unsigned long vaddr = (unsigned long)page_address(page);
442
443 if (vaddr)
444 __flush_page_to_ram(vaddr);
445 }
446 EXPORT_SYMBOL(sparc_flush_page_to_ram);
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