Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/arch/parisc/mm/init.c | |
3 | * | |
4 | * Copyright (C) 1995 Linus Torvalds | |
5 | * Copyright 1999 SuSE GmbH | |
6 | * changed by Philipp Rumpf | |
7 | * Copyright 1999 Philipp Rumpf (prumpf@tux.org) | |
8 | * Copyright 2004 Randolph Chung (tausq@debian.org) | |
2fd83038 | 9 | * Copyright 2006 Helge Deller (deller@gmx.de) |
1da177e4 LT |
10 | * |
11 | */ | |
12 | ||
1da177e4 LT |
13 | |
14 | #include <linux/module.h> | |
15 | #include <linux/mm.h> | |
16 | #include <linux/bootmem.h> | |
17 | #include <linux/delay.h> | |
18 | #include <linux/init.h> | |
19 | #include <linux/pci.h> /* for hppa_dma_ops and pcxl_dma_ops */ | |
20 | #include <linux/initrd.h> | |
21 | #include <linux/swap.h> | |
22 | #include <linux/unistd.h> | |
23 | #include <linux/nodemask.h> /* for node_online_map */ | |
24 | #include <linux/pagemap.h> /* for release_pages and page_cache_release */ | |
25 | ||
26 | #include <asm/pgalloc.h> | |
27 | #include <asm/tlb.h> | |
28 | #include <asm/pdc_chassis.h> | |
29 | #include <asm/mmzone.h> | |
30 | ||
31 | DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); | |
32 | ||
33 | extern char _text; /* start of kernel code, defined by linker */ | |
34 | extern int data_start; | |
35 | extern char _end; /* end of BSS, defined by linker */ | |
36 | extern char __init_begin, __init_end; | |
37 | ||
38 | #ifdef CONFIG_DISCONTIGMEM | |
8039de10 HD |
39 | struct node_map_data node_data[MAX_NUMNODES] __read_mostly; |
40 | bootmem_data_t bmem_data[MAX_NUMNODES] __read_mostly; | |
41 | unsigned char pfnnid_map[PFNNID_MAP_MAX] __read_mostly; | |
1da177e4 LT |
42 | #endif |
43 | ||
44 | static struct resource data_resource = { | |
45 | .name = "Kernel data", | |
46 | .flags = IORESOURCE_BUSY | IORESOURCE_MEM, | |
47 | }; | |
48 | ||
49 | static struct resource code_resource = { | |
50 | .name = "Kernel code", | |
51 | .flags = IORESOURCE_BUSY | IORESOURCE_MEM, | |
52 | }; | |
53 | ||
54 | static struct resource pdcdata_resource = { | |
55 | .name = "PDC data (Page Zero)", | |
56 | .start = 0, | |
57 | .end = 0x9ff, | |
58 | .flags = IORESOURCE_BUSY | IORESOURCE_MEM, | |
59 | }; | |
60 | ||
8039de10 | 61 | static struct resource sysram_resources[MAX_PHYSMEM_RANGES] __read_mostly; |
1da177e4 LT |
62 | |
63 | /* The following array is initialized from the firmware specific | |
64 | * information retrieved in kernel/inventory.c. | |
65 | */ | |
66 | ||
8039de10 HD |
67 | physmem_range_t pmem_ranges[MAX_PHYSMEM_RANGES] __read_mostly; |
68 | int npmem_ranges __read_mostly; | |
1da177e4 LT |
69 | |
70 | #ifdef __LP64__ | |
71 | #define MAX_MEM (~0UL) | |
72 | #else /* !__LP64__ */ | |
73 | #define MAX_MEM (3584U*1024U*1024U) | |
74 | #endif /* !__LP64__ */ | |
75 | ||
8039de10 | 76 | static unsigned long mem_limit __read_mostly = MAX_MEM; |
1da177e4 LT |
77 | |
78 | static void __init mem_limit_func(void) | |
79 | { | |
80 | char *cp, *end; | |
81 | unsigned long limit; | |
82 | extern char saved_command_line[]; | |
83 | ||
84 | /* We need this before __setup() functions are called */ | |
85 | ||
86 | limit = MAX_MEM; | |
87 | for (cp = saved_command_line; *cp; ) { | |
88 | if (memcmp(cp, "mem=", 4) == 0) { | |
89 | cp += 4; | |
90 | limit = memparse(cp, &end); | |
91 | if (end != cp) | |
92 | break; | |
93 | cp = end; | |
94 | } else { | |
95 | while (*cp != ' ' && *cp) | |
96 | ++cp; | |
97 | while (*cp == ' ') | |
98 | ++cp; | |
99 | } | |
100 | } | |
101 | ||
102 | if (limit < mem_limit) | |
103 | mem_limit = limit; | |
104 | } | |
105 | ||
106 | #define MAX_GAP (0x40000000UL >> PAGE_SHIFT) | |
107 | ||
108 | static void __init setup_bootmem(void) | |
109 | { | |
110 | unsigned long bootmap_size; | |
111 | unsigned long mem_max; | |
112 | unsigned long bootmap_pages; | |
113 | unsigned long bootmap_start_pfn; | |
114 | unsigned long bootmap_pfn; | |
115 | #ifndef CONFIG_DISCONTIGMEM | |
116 | physmem_range_t pmem_holes[MAX_PHYSMEM_RANGES - 1]; | |
117 | int npmem_holes; | |
118 | #endif | |
119 | int i, sysram_resource_count; | |
120 | ||
121 | disable_sr_hashing(); /* Turn off space register hashing */ | |
122 | ||
123 | /* | |
124 | * Sort the ranges. Since the number of ranges is typically | |
125 | * small, and performance is not an issue here, just do | |
126 | * a simple insertion sort. | |
127 | */ | |
128 | ||
129 | for (i = 1; i < npmem_ranges; i++) { | |
130 | int j; | |
131 | ||
132 | for (j = i; j > 0; j--) { | |
133 | unsigned long tmp; | |
134 | ||
135 | if (pmem_ranges[j-1].start_pfn < | |
136 | pmem_ranges[j].start_pfn) { | |
137 | ||
138 | break; | |
139 | } | |
140 | tmp = pmem_ranges[j-1].start_pfn; | |
141 | pmem_ranges[j-1].start_pfn = pmem_ranges[j].start_pfn; | |
142 | pmem_ranges[j].start_pfn = tmp; | |
143 | tmp = pmem_ranges[j-1].pages; | |
144 | pmem_ranges[j-1].pages = pmem_ranges[j].pages; | |
145 | pmem_ranges[j].pages = tmp; | |
146 | } | |
147 | } | |
148 | ||
149 | #ifndef CONFIG_DISCONTIGMEM | |
150 | /* | |
151 | * Throw out ranges that are too far apart (controlled by | |
152 | * MAX_GAP). | |
153 | */ | |
154 | ||
155 | for (i = 1; i < npmem_ranges; i++) { | |
156 | if (pmem_ranges[i].start_pfn - | |
157 | (pmem_ranges[i-1].start_pfn + | |
158 | pmem_ranges[i-1].pages) > MAX_GAP) { | |
159 | npmem_ranges = i; | |
160 | printk("Large gap in memory detected (%ld pages). " | |
161 | "Consider turning on CONFIG_DISCONTIGMEM\n", | |
162 | pmem_ranges[i].start_pfn - | |
163 | (pmem_ranges[i-1].start_pfn + | |
164 | pmem_ranges[i-1].pages)); | |
165 | break; | |
166 | } | |
167 | } | |
168 | #endif | |
169 | ||
170 | if (npmem_ranges > 1) { | |
171 | ||
172 | /* Print the memory ranges */ | |
173 | ||
174 | printk(KERN_INFO "Memory Ranges:\n"); | |
175 | ||
176 | for (i = 0; i < npmem_ranges; i++) { | |
177 | unsigned long start; | |
178 | unsigned long size; | |
179 | ||
180 | size = (pmem_ranges[i].pages << PAGE_SHIFT); | |
181 | start = (pmem_ranges[i].start_pfn << PAGE_SHIFT); | |
182 | printk(KERN_INFO "%2d) Start 0x%016lx End 0x%016lx Size %6ld MB\n", | |
183 | i,start, start + (size - 1), size >> 20); | |
184 | } | |
185 | } | |
186 | ||
187 | sysram_resource_count = npmem_ranges; | |
188 | for (i = 0; i < sysram_resource_count; i++) { | |
189 | struct resource *res = &sysram_resources[i]; | |
190 | res->name = "System RAM"; | |
191 | res->start = pmem_ranges[i].start_pfn << PAGE_SHIFT; | |
192 | res->end = res->start + (pmem_ranges[i].pages << PAGE_SHIFT)-1; | |
193 | res->flags = IORESOURCE_MEM | IORESOURCE_BUSY; | |
194 | request_resource(&iomem_resource, res); | |
195 | } | |
196 | ||
197 | /* | |
198 | * For 32 bit kernels we limit the amount of memory we can | |
199 | * support, in order to preserve enough kernel address space | |
200 | * for other purposes. For 64 bit kernels we don't normally | |
201 | * limit the memory, but this mechanism can be used to | |
202 | * artificially limit the amount of memory (and it is written | |
203 | * to work with multiple memory ranges). | |
204 | */ | |
205 | ||
206 | mem_limit_func(); /* check for "mem=" argument */ | |
207 | ||
208 | mem_max = 0; | |
209 | num_physpages = 0; | |
210 | for (i = 0; i < npmem_ranges; i++) { | |
211 | unsigned long rsize; | |
212 | ||
213 | rsize = pmem_ranges[i].pages << PAGE_SHIFT; | |
214 | if ((mem_max + rsize) > mem_limit) { | |
215 | printk(KERN_WARNING "Memory truncated to %ld MB\n", mem_limit >> 20); | |
216 | if (mem_max == mem_limit) | |
217 | npmem_ranges = i; | |
218 | else { | |
219 | pmem_ranges[i].pages = (mem_limit >> PAGE_SHIFT) | |
220 | - (mem_max >> PAGE_SHIFT); | |
221 | npmem_ranges = i + 1; | |
222 | mem_max = mem_limit; | |
223 | } | |
224 | num_physpages += pmem_ranges[i].pages; | |
225 | break; | |
226 | } | |
227 | num_physpages += pmem_ranges[i].pages; | |
228 | mem_max += rsize; | |
229 | } | |
230 | ||
231 | printk(KERN_INFO "Total Memory: %ld MB\n",mem_max >> 20); | |
232 | ||
233 | #ifndef CONFIG_DISCONTIGMEM | |
234 | /* Merge the ranges, keeping track of the holes */ | |
235 | ||
236 | { | |
237 | unsigned long end_pfn; | |
238 | unsigned long hole_pages; | |
239 | ||
240 | npmem_holes = 0; | |
241 | end_pfn = pmem_ranges[0].start_pfn + pmem_ranges[0].pages; | |
242 | for (i = 1; i < npmem_ranges; i++) { | |
243 | ||
244 | hole_pages = pmem_ranges[i].start_pfn - end_pfn; | |
245 | if (hole_pages) { | |
246 | pmem_holes[npmem_holes].start_pfn = end_pfn; | |
247 | pmem_holes[npmem_holes++].pages = hole_pages; | |
248 | end_pfn += hole_pages; | |
249 | } | |
250 | end_pfn += pmem_ranges[i].pages; | |
251 | } | |
252 | ||
253 | pmem_ranges[0].pages = end_pfn - pmem_ranges[0].start_pfn; | |
254 | npmem_ranges = 1; | |
255 | } | |
256 | #endif | |
257 | ||
258 | bootmap_pages = 0; | |
259 | for (i = 0; i < npmem_ranges; i++) | |
260 | bootmap_pages += bootmem_bootmap_pages(pmem_ranges[i].pages); | |
261 | ||
262 | bootmap_start_pfn = PAGE_ALIGN(__pa((unsigned long) &_end)) >> PAGE_SHIFT; | |
263 | ||
264 | #ifdef CONFIG_DISCONTIGMEM | |
265 | for (i = 0; i < MAX_PHYSMEM_RANGES; i++) { | |
266 | memset(NODE_DATA(i), 0, sizeof(pg_data_t)); | |
267 | NODE_DATA(i)->bdata = &bmem_data[i]; | |
268 | } | |
269 | memset(pfnnid_map, 0xff, sizeof(pfnnid_map)); | |
270 | ||
271 | for (i = 0; i < npmem_ranges; i++) | |
272 | node_set_online(i); | |
273 | #endif | |
274 | ||
275 | /* | |
276 | * Initialize and free the full range of memory in each range. | |
277 | * Note that the only writing these routines do are to the bootmap, | |
278 | * and we've made sure to locate the bootmap properly so that they | |
279 | * won't be writing over anything important. | |
280 | */ | |
281 | ||
282 | bootmap_pfn = bootmap_start_pfn; | |
283 | max_pfn = 0; | |
284 | for (i = 0; i < npmem_ranges; i++) { | |
285 | unsigned long start_pfn; | |
286 | unsigned long npages; | |
287 | ||
288 | start_pfn = pmem_ranges[i].start_pfn; | |
289 | npages = pmem_ranges[i].pages; | |
290 | ||
291 | bootmap_size = init_bootmem_node(NODE_DATA(i), | |
292 | bootmap_pfn, | |
293 | start_pfn, | |
294 | (start_pfn + npages) ); | |
295 | free_bootmem_node(NODE_DATA(i), | |
296 | (start_pfn << PAGE_SHIFT), | |
297 | (npages << PAGE_SHIFT) ); | |
298 | bootmap_pfn += (bootmap_size + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
299 | if ((start_pfn + npages) > max_pfn) | |
300 | max_pfn = start_pfn + npages; | |
301 | } | |
302 | ||
5cdb8205 GG |
303 | /* IOMMU is always used to access "high mem" on those boxes |
304 | * that can support enough mem that a PCI device couldn't | |
305 | * directly DMA to any physical addresses. | |
306 | * ISA DMA support will need to revisit this. | |
307 | */ | |
308 | max_low_pfn = max_pfn; | |
309 | ||
1da177e4 LT |
310 | if ((bootmap_pfn - bootmap_start_pfn) != bootmap_pages) { |
311 | printk(KERN_WARNING "WARNING! bootmap sizing is messed up!\n"); | |
312 | BUG(); | |
313 | } | |
314 | ||
315 | /* reserve PAGE0 pdc memory, kernel text/data/bss & bootmap */ | |
316 | ||
317 | #define PDC_CONSOLE_IO_IODC_SIZE 32768 | |
318 | ||
319 | reserve_bootmem_node(NODE_DATA(0), 0UL, | |
320 | (unsigned long)(PAGE0->mem_free + PDC_CONSOLE_IO_IODC_SIZE)); | |
321 | reserve_bootmem_node(NODE_DATA(0),__pa((unsigned long)&_text), | |
322 | (unsigned long)(&_end - &_text)); | |
323 | reserve_bootmem_node(NODE_DATA(0), (bootmap_start_pfn << PAGE_SHIFT), | |
324 | ((bootmap_pfn - bootmap_start_pfn) << PAGE_SHIFT)); | |
325 | ||
326 | #ifndef CONFIG_DISCONTIGMEM | |
327 | ||
328 | /* reserve the holes */ | |
329 | ||
330 | for (i = 0; i < npmem_holes; i++) { | |
331 | reserve_bootmem_node(NODE_DATA(0), | |
332 | (pmem_holes[i].start_pfn << PAGE_SHIFT), | |
333 | (pmem_holes[i].pages << PAGE_SHIFT)); | |
334 | } | |
335 | #endif | |
336 | ||
337 | #ifdef CONFIG_BLK_DEV_INITRD | |
338 | if (initrd_start) { | |
339 | printk(KERN_INFO "initrd: %08lx-%08lx\n", initrd_start, initrd_end); | |
340 | if (__pa(initrd_start) < mem_max) { | |
341 | unsigned long initrd_reserve; | |
342 | ||
343 | if (__pa(initrd_end) > mem_max) { | |
344 | initrd_reserve = mem_max - __pa(initrd_start); | |
345 | } else { | |
346 | initrd_reserve = initrd_end - initrd_start; | |
347 | } | |
348 | initrd_below_start_ok = 1; | |
349 | printk(KERN_INFO "initrd: reserving %08lx-%08lx (mem_max %08lx)\n", __pa(initrd_start), __pa(initrd_start) + initrd_reserve, mem_max); | |
350 | ||
351 | reserve_bootmem_node(NODE_DATA(0),__pa(initrd_start), initrd_reserve); | |
352 | } | |
353 | } | |
354 | #endif | |
355 | ||
356 | data_resource.start = virt_to_phys(&data_start); | |
357 | data_resource.end = virt_to_phys(&_end)-1; | |
358 | code_resource.start = virt_to_phys(&_text); | |
359 | code_resource.end = virt_to_phys(&data_start)-1; | |
360 | ||
361 | /* We don't know which region the kernel will be in, so try | |
362 | * all of them. | |
363 | */ | |
364 | for (i = 0; i < sysram_resource_count; i++) { | |
365 | struct resource *res = &sysram_resources[i]; | |
366 | request_resource(res, &code_resource); | |
367 | request_resource(res, &data_resource); | |
368 | } | |
369 | request_resource(&sysram_resources[0], &pdcdata_resource); | |
370 | } | |
371 | ||
372 | void free_initmem(void) | |
373 | { | |
2fd83038 HD |
374 | unsigned long addr, init_begin, init_end; |
375 | ||
1da177e4 LT |
376 | printk(KERN_INFO "Freeing unused kernel memory: "); |
377 | ||
81a3de3e | 378 | #ifdef CONFIG_DEBUG_KERNEL |
1da177e4 LT |
379 | /* Attempt to catch anyone trying to execute code here |
380 | * by filling the page with BRK insns. | |
381 | * | |
382 | * If we disable interrupts for all CPUs, then IPI stops working. | |
383 | * Kinda breaks the global cache flushing. | |
384 | */ | |
385 | local_irq_disable(); | |
386 | ||
387 | memset(&__init_begin, 0x00, | |
388 | (unsigned long)&__init_end - (unsigned long)&__init_begin); | |
389 | ||
390 | flush_data_cache(); | |
391 | asm volatile("sync" : : ); | |
392 | flush_icache_range((unsigned long)&__init_begin, (unsigned long)&__init_end); | |
393 | asm volatile("sync" : : ); | |
394 | ||
395 | local_irq_enable(); | |
396 | #endif | |
397 | ||
2fd83038 HD |
398 | /* align __init_begin and __init_end to page size, |
399 | ignoring linker script where we might have tried to save RAM */ | |
400 | init_begin = PAGE_ALIGN((unsigned long)(&__init_begin)); | |
401 | init_end = PAGE_ALIGN((unsigned long)(&__init_end)); | |
402 | for (addr = init_begin; addr < init_end; addr += PAGE_SIZE) { | |
1da177e4 | 403 | ClearPageReserved(virt_to_page(addr)); |
7835e98b | 404 | init_page_count(virt_to_page(addr)); |
1da177e4 LT |
405 | free_page(addr); |
406 | num_physpages++; | |
407 | totalram_pages++; | |
408 | } | |
409 | ||
410 | /* set up a new led state on systems shipped LED State panel */ | |
411 | pdc_chassis_send_status(PDC_CHASSIS_DIRECT_BCOMPLETE); | |
412 | ||
2fd83038 | 413 | printk("%luk freed\n", (init_end - init_begin) >> 10); |
1da177e4 LT |
414 | } |
415 | ||
1bcdd854 HD |
416 | |
417 | #ifdef CONFIG_DEBUG_RODATA | |
418 | void mark_rodata_ro(void) | |
419 | { | |
420 | extern char __start_rodata, __end_rodata; | |
421 | /* rodata memory was already mapped with KERNEL_RO access rights by | |
422 | pagetable_init() and map_pages(). No need to do additional stuff here */ | |
423 | printk (KERN_INFO "Write protecting the kernel read-only data: %luk\n", | |
424 | (unsigned long)(&__end_rodata - &__start_rodata) >> 10); | |
425 | } | |
426 | #endif | |
427 | ||
428 | ||
1da177e4 LT |
429 | /* |
430 | * Just an arbitrary offset to serve as a "hole" between mapping areas | |
431 | * (between top of physical memory and a potential pcxl dma mapping | |
432 | * area, and below the vmalloc mapping area). | |
433 | * | |
434 | * The current 32K value just means that there will be a 32K "hole" | |
435 | * between mapping areas. That means that any out-of-bounds memory | |
436 | * accesses will hopefully be caught. The vmalloc() routines leaves | |
437 | * a hole of 4kB between each vmalloced area for the same reason. | |
438 | */ | |
439 | ||
440 | /* Leave room for gateway page expansion */ | |
441 | #if KERNEL_MAP_START < GATEWAY_PAGE_SIZE | |
442 | #error KERNEL_MAP_START is in gateway reserved region | |
443 | #endif | |
444 | #define MAP_START (KERNEL_MAP_START) | |
445 | ||
446 | #define VM_MAP_OFFSET (32*1024) | |
447 | #define SET_MAP_OFFSET(x) ((void *)(((unsigned long)(x) + VM_MAP_OFFSET) \ | |
448 | & ~(VM_MAP_OFFSET-1))) | |
449 | ||
8039de10 | 450 | void *vmalloc_start __read_mostly; |
1da177e4 LT |
451 | EXPORT_SYMBOL(vmalloc_start); |
452 | ||
453 | #ifdef CONFIG_PA11 | |
8039de10 | 454 | unsigned long pcxl_dma_start __read_mostly; |
1da177e4 LT |
455 | #endif |
456 | ||
457 | void __init mem_init(void) | |
458 | { | |
459 | high_memory = __va((max_pfn << PAGE_SHIFT)); | |
460 | ||
461 | #ifndef CONFIG_DISCONTIGMEM | |
462 | max_mapnr = page_to_pfn(virt_to_page(high_memory - 1)) + 1; | |
463 | totalram_pages += free_all_bootmem(); | |
464 | #else | |
465 | { | |
466 | int i; | |
467 | ||
468 | for (i = 0; i < npmem_ranges; i++) | |
469 | totalram_pages += free_all_bootmem_node(NODE_DATA(i)); | |
470 | } | |
471 | #endif | |
472 | ||
473 | printk(KERN_INFO "Memory: %luk available\n", num_physpages << (PAGE_SHIFT-10)); | |
474 | ||
475 | #ifdef CONFIG_PA11 | |
476 | if (hppa_dma_ops == &pcxl_dma_ops) { | |
477 | pcxl_dma_start = (unsigned long)SET_MAP_OFFSET(MAP_START); | |
478 | vmalloc_start = SET_MAP_OFFSET(pcxl_dma_start + PCXL_DMA_MAP_SIZE); | |
479 | } else { | |
480 | pcxl_dma_start = 0; | |
481 | vmalloc_start = SET_MAP_OFFSET(MAP_START); | |
482 | } | |
483 | #else | |
484 | vmalloc_start = SET_MAP_OFFSET(MAP_START); | |
485 | #endif | |
486 | ||
487 | } | |
488 | ||
8039de10 | 489 | unsigned long *empty_zero_page __read_mostly; |
1da177e4 LT |
490 | |
491 | void show_mem(void) | |
492 | { | |
493 | int i,free = 0,total = 0,reserved = 0; | |
494 | int shared = 0, cached = 0; | |
495 | ||
496 | printk(KERN_INFO "Mem-info:\n"); | |
497 | show_free_areas(); | |
498 | printk(KERN_INFO "Free swap: %6ldkB\n", | |
499 | nr_swap_pages<<(PAGE_SHIFT-10)); | |
500 | #ifndef CONFIG_DISCONTIGMEM | |
501 | i = max_mapnr; | |
502 | while (i-- > 0) { | |
503 | total++; | |
504 | if (PageReserved(mem_map+i)) | |
505 | reserved++; | |
506 | else if (PageSwapCache(mem_map+i)) | |
507 | cached++; | |
508 | else if (!page_count(&mem_map[i])) | |
509 | free++; | |
510 | else | |
511 | shared += page_count(&mem_map[i]) - 1; | |
512 | } | |
513 | #else | |
514 | for (i = 0; i < npmem_ranges; i++) { | |
515 | int j; | |
516 | ||
517 | for (j = node_start_pfn(i); j < node_end_pfn(i); j++) { | |
518 | struct page *p; | |
208d54e5 | 519 | unsigned long flags; |
1da177e4 | 520 | |
208d54e5 | 521 | pgdat_resize_lock(NODE_DATA(i), &flags); |
408fde81 | 522 | p = nid_page_nr(i, j) - node_start_pfn(i); |
1da177e4 LT |
523 | |
524 | total++; | |
525 | if (PageReserved(p)) | |
526 | reserved++; | |
527 | else if (PageSwapCache(p)) | |
528 | cached++; | |
529 | else if (!page_count(p)) | |
530 | free++; | |
531 | else | |
532 | shared += page_count(p) - 1; | |
208d54e5 | 533 | pgdat_resize_unlock(NODE_DATA(i), &flags); |
1da177e4 LT |
534 | } |
535 | } | |
536 | #endif | |
537 | printk(KERN_INFO "%d pages of RAM\n", total); | |
538 | printk(KERN_INFO "%d reserved pages\n", reserved); | |
539 | printk(KERN_INFO "%d pages shared\n", shared); | |
540 | printk(KERN_INFO "%d pages swap cached\n", cached); | |
541 | ||
542 | ||
543 | #ifdef CONFIG_DISCONTIGMEM | |
544 | { | |
545 | struct zonelist *zl; | |
546 | int i, j, k; | |
547 | ||
548 | for (i = 0; i < npmem_ranges; i++) { | |
549 | for (j = 0; j < MAX_NR_ZONES; j++) { | |
550 | zl = NODE_DATA(i)->node_zonelists + j; | |
551 | ||
552 | printk("Zone list for zone %d on node %d: ", j, i); | |
553 | for (k = 0; zl->zones[k] != NULL; k++) | |
554 | printk("[%d/%s] ", zl->zones[k]->zone_pgdat->node_id, zl->zones[k]->name); | |
555 | printk("\n"); | |
556 | } | |
557 | } | |
558 | } | |
559 | #endif | |
560 | } | |
561 | ||
562 | ||
563 | static void __init map_pages(unsigned long start_vaddr, unsigned long start_paddr, unsigned long size, pgprot_t pgprot) | |
564 | { | |
565 | pgd_t *pg_dir; | |
566 | pmd_t *pmd; | |
567 | pte_t *pg_table; | |
568 | unsigned long end_paddr; | |
569 | unsigned long start_pmd; | |
570 | unsigned long start_pte; | |
571 | unsigned long tmp1; | |
572 | unsigned long tmp2; | |
573 | unsigned long address; | |
574 | unsigned long ro_start; | |
575 | unsigned long ro_end; | |
576 | unsigned long fv_addr; | |
577 | unsigned long gw_addr; | |
578 | extern const unsigned long fault_vector_20; | |
579 | extern void * const linux_gateway_page; | |
580 | ||
581 | ro_start = __pa((unsigned long)&_text); | |
582 | ro_end = __pa((unsigned long)&data_start); | |
583 | fv_addr = __pa((unsigned long)&fault_vector_20) & PAGE_MASK; | |
584 | gw_addr = __pa((unsigned long)&linux_gateway_page) & PAGE_MASK; | |
585 | ||
586 | end_paddr = start_paddr + size; | |
587 | ||
588 | pg_dir = pgd_offset_k(start_vaddr); | |
589 | ||
590 | #if PTRS_PER_PMD == 1 | |
591 | start_pmd = 0; | |
592 | #else | |
593 | start_pmd = ((start_vaddr >> PMD_SHIFT) & (PTRS_PER_PMD - 1)); | |
594 | #endif | |
595 | start_pte = ((start_vaddr >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)); | |
596 | ||
597 | address = start_paddr; | |
598 | while (address < end_paddr) { | |
599 | #if PTRS_PER_PMD == 1 | |
600 | pmd = (pmd_t *)__pa(pg_dir); | |
601 | #else | |
602 | pmd = (pmd_t *)pgd_address(*pg_dir); | |
603 | ||
604 | /* | |
605 | * pmd is physical at this point | |
606 | */ | |
607 | ||
608 | if (!pmd) { | |
609 | pmd = (pmd_t *) alloc_bootmem_low_pages_node(NODE_DATA(0),PAGE_SIZE << PMD_ORDER); | |
610 | pmd = (pmd_t *) __pa(pmd); | |
611 | } | |
612 | ||
613 | pgd_populate(NULL, pg_dir, __va(pmd)); | |
614 | #endif | |
615 | pg_dir++; | |
616 | ||
617 | /* now change pmd to kernel virtual addresses */ | |
618 | ||
619 | pmd = (pmd_t *)__va(pmd) + start_pmd; | |
620 | for (tmp1 = start_pmd; tmp1 < PTRS_PER_PMD; tmp1++,pmd++) { | |
621 | ||
622 | /* | |
623 | * pg_table is physical at this point | |
624 | */ | |
625 | ||
626 | pg_table = (pte_t *)pmd_address(*pmd); | |
627 | if (!pg_table) { | |
628 | pg_table = (pte_t *) | |
629 | alloc_bootmem_low_pages_node(NODE_DATA(0),PAGE_SIZE); | |
630 | pg_table = (pte_t *) __pa(pg_table); | |
631 | } | |
632 | ||
633 | pmd_populate_kernel(NULL, pmd, __va(pg_table)); | |
634 | ||
635 | /* now change pg_table to kernel virtual addresses */ | |
636 | ||
637 | pg_table = (pte_t *) __va(pg_table) + start_pte; | |
638 | for (tmp2 = start_pte; tmp2 < PTRS_PER_PTE; tmp2++,pg_table++) { | |
639 | pte_t pte; | |
640 | ||
641 | /* | |
642 | * Map the fault vector writable so we can | |
643 | * write the HPMC checksum. | |
644 | */ | |
2fd83038 | 645 | #if defined(CONFIG_PARISC_PAGE_SIZE_4KB) |
1da177e4 LT |
646 | if (address >= ro_start && address < ro_end |
647 | && address != fv_addr | |
648 | && address != gw_addr) | |
649 | pte = __mk_pte(address, PAGE_KERNEL_RO); | |
650 | else | |
2fd83038 | 651 | #endif |
1da177e4 LT |
652 | pte = __mk_pte(address, pgprot); |
653 | ||
654 | if (address >= end_paddr) | |
655 | pte_val(pte) = 0; | |
656 | ||
657 | set_pte(pg_table, pte); | |
658 | ||
659 | address += PAGE_SIZE; | |
660 | } | |
661 | start_pte = 0; | |
662 | ||
663 | if (address >= end_paddr) | |
664 | break; | |
665 | } | |
666 | start_pmd = 0; | |
667 | } | |
668 | } | |
669 | ||
670 | /* | |
671 | * pagetable_init() sets up the page tables | |
672 | * | |
673 | * Note that gateway_init() places the Linux gateway page at page 0. | |
674 | * Since gateway pages cannot be dereferenced this has the desirable | |
675 | * side effect of trapping those pesky NULL-reference errors in the | |
676 | * kernel. | |
677 | */ | |
678 | static void __init pagetable_init(void) | |
679 | { | |
680 | int range; | |
681 | ||
682 | /* Map each physical memory range to its kernel vaddr */ | |
683 | ||
684 | for (range = 0; range < npmem_ranges; range++) { | |
685 | unsigned long start_paddr; | |
686 | unsigned long end_paddr; | |
687 | unsigned long size; | |
688 | ||
689 | start_paddr = pmem_ranges[range].start_pfn << PAGE_SHIFT; | |
690 | end_paddr = start_paddr + (pmem_ranges[range].pages << PAGE_SHIFT); | |
691 | size = pmem_ranges[range].pages << PAGE_SHIFT; | |
692 | ||
693 | map_pages((unsigned long)__va(start_paddr), start_paddr, | |
694 | size, PAGE_KERNEL); | |
695 | } | |
696 | ||
697 | #ifdef CONFIG_BLK_DEV_INITRD | |
698 | if (initrd_end && initrd_end > mem_limit) { | |
1bcdd854 | 699 | printk(KERN_INFO "initrd: mapping %08lx-%08lx\n", initrd_start, initrd_end); |
1da177e4 LT |
700 | map_pages(initrd_start, __pa(initrd_start), |
701 | initrd_end - initrd_start, PAGE_KERNEL); | |
702 | } | |
703 | #endif | |
704 | ||
705 | empty_zero_page = alloc_bootmem_pages(PAGE_SIZE); | |
706 | memset(empty_zero_page, 0, PAGE_SIZE); | |
707 | } | |
708 | ||
709 | static void __init gateway_init(void) | |
710 | { | |
711 | unsigned long linux_gateway_page_addr; | |
712 | /* FIXME: This is 'const' in order to trick the compiler | |
713 | into not treating it as DP-relative data. */ | |
714 | extern void * const linux_gateway_page; | |
715 | ||
716 | linux_gateway_page_addr = LINUX_GATEWAY_ADDR & PAGE_MASK; | |
717 | ||
718 | /* | |
719 | * Setup Linux Gateway page. | |
720 | * | |
721 | * The Linux gateway page will reside in kernel space (on virtual | |
722 | * page 0), so it doesn't need to be aliased into user space. | |
723 | */ | |
724 | ||
725 | map_pages(linux_gateway_page_addr, __pa(&linux_gateway_page), | |
726 | PAGE_SIZE, PAGE_GATEWAY); | |
727 | } | |
728 | ||
729 | #ifdef CONFIG_HPUX | |
730 | void | |
731 | map_hpux_gateway_page(struct task_struct *tsk, struct mm_struct *mm) | |
732 | { | |
733 | pgd_t *pg_dir; | |
734 | pmd_t *pmd; | |
735 | pte_t *pg_table; | |
736 | unsigned long start_pmd; | |
737 | unsigned long start_pte; | |
738 | unsigned long address; | |
739 | unsigned long hpux_gw_page_addr; | |
740 | /* FIXME: This is 'const' in order to trick the compiler | |
741 | into not treating it as DP-relative data. */ | |
742 | extern void * const hpux_gateway_page; | |
743 | ||
744 | hpux_gw_page_addr = HPUX_GATEWAY_ADDR & PAGE_MASK; | |
745 | ||
746 | /* | |
747 | * Setup HP-UX Gateway page. | |
748 | * | |
749 | * The HP-UX gateway page resides in the user address space, | |
750 | * so it needs to be aliased into each process. | |
751 | */ | |
752 | ||
753 | pg_dir = pgd_offset(mm,hpux_gw_page_addr); | |
754 | ||
755 | #if PTRS_PER_PMD == 1 | |
756 | start_pmd = 0; | |
757 | #else | |
758 | start_pmd = ((hpux_gw_page_addr >> PMD_SHIFT) & (PTRS_PER_PMD - 1)); | |
759 | #endif | |
760 | start_pte = ((hpux_gw_page_addr >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)); | |
761 | ||
762 | address = __pa(&hpux_gateway_page); | |
763 | #if PTRS_PER_PMD == 1 | |
764 | pmd = (pmd_t *)__pa(pg_dir); | |
765 | #else | |
766 | pmd = (pmd_t *) pgd_address(*pg_dir); | |
767 | ||
768 | /* | |
769 | * pmd is physical at this point | |
770 | */ | |
771 | ||
772 | if (!pmd) { | |
773 | pmd = (pmd_t *) get_zeroed_page(GFP_KERNEL); | |
774 | pmd = (pmd_t *) __pa(pmd); | |
775 | } | |
776 | ||
777 | __pgd_val_set(*pg_dir, PxD_FLAG_PRESENT | PxD_FLAG_VALID | (unsigned long) pmd); | |
778 | #endif | |
779 | /* now change pmd to kernel virtual addresses */ | |
780 | ||
781 | pmd = (pmd_t *)__va(pmd) + start_pmd; | |
782 | ||
783 | /* | |
784 | * pg_table is physical at this point | |
785 | */ | |
786 | ||
787 | pg_table = (pte_t *) pmd_address(*pmd); | |
788 | if (!pg_table) | |
789 | pg_table = (pte_t *) __pa(get_zeroed_page(GFP_KERNEL)); | |
790 | ||
791 | __pmd_val_set(*pmd, PxD_FLAG_PRESENT | PxD_FLAG_VALID | (unsigned long) pg_table); | |
792 | ||
793 | /* now change pg_table to kernel virtual addresses */ | |
794 | ||
795 | pg_table = (pte_t *) __va(pg_table) + start_pte; | |
796 | set_pte(pg_table, __mk_pte(address, PAGE_GATEWAY)); | |
797 | } | |
798 | EXPORT_SYMBOL(map_hpux_gateway_page); | |
799 | #endif | |
800 | ||
1da177e4 LT |
801 | void __init paging_init(void) |
802 | { | |
803 | int i; | |
804 | ||
805 | setup_bootmem(); | |
806 | pagetable_init(); | |
807 | gateway_init(); | |
808 | flush_cache_all_local(); /* start with known state */ | |
ce33941f | 809 | flush_tlb_all_local(NULL); |
1da177e4 LT |
810 | |
811 | for (i = 0; i < npmem_ranges; i++) { | |
812 | unsigned long zones_size[MAX_NR_ZONES] = { 0, 0, 0 }; | |
813 | ||
814 | /* We have an IOMMU, so all memory can go into a single | |
815 | ZONE_DMA zone. */ | |
816 | zones_size[ZONE_DMA] = pmem_ranges[i].pages; | |
817 | ||
818 | #ifdef CONFIG_DISCONTIGMEM | |
819 | /* Need to initialize the pfnnid_map before we can initialize | |
820 | the zone */ | |
821 | { | |
822 | int j; | |
823 | for (j = (pmem_ranges[i].start_pfn >> PFNNID_SHIFT); | |
824 | j <= ((pmem_ranges[i].start_pfn + pmem_ranges[i].pages) >> PFNNID_SHIFT); | |
825 | j++) { | |
826 | pfnnid_map[j] = i; | |
827 | } | |
828 | } | |
829 | #endif | |
830 | ||
831 | free_area_init_node(i, NODE_DATA(i), zones_size, | |
832 | pmem_ranges[i].start_pfn, NULL); | |
833 | } | |
834 | } | |
835 | ||
836 | #ifdef CONFIG_PA20 | |
837 | ||
838 | /* | |
839 | * Currently, all PA20 chips have 18 bit protection id's, which is the | |
840 | * limiting factor (space ids are 32 bits). | |
841 | */ | |
842 | ||
843 | #define NR_SPACE_IDS 262144 | |
844 | ||
845 | #else | |
846 | ||
847 | /* | |
848 | * Currently we have a one-to-one relationship between space id's and | |
849 | * protection id's. Older parisc chips (PCXS, PCXT, PCXL, PCXL2) only | |
850 | * support 15 bit protection id's, so that is the limiting factor. | |
851 | * PCXT' has 18 bit protection id's, but only 16 bit spaceids, so it's | |
852 | * probably not worth the effort for a special case here. | |
853 | */ | |
854 | ||
855 | #define NR_SPACE_IDS 32768 | |
856 | ||
857 | #endif /* !CONFIG_PA20 */ | |
858 | ||
859 | #define RECYCLE_THRESHOLD (NR_SPACE_IDS / 2) | |
860 | #define SID_ARRAY_SIZE (NR_SPACE_IDS / (8 * sizeof(long))) | |
861 | ||
862 | static unsigned long space_id[SID_ARRAY_SIZE] = { 1 }; /* disallow space 0 */ | |
863 | static unsigned long dirty_space_id[SID_ARRAY_SIZE]; | |
864 | static unsigned long space_id_index; | |
865 | static unsigned long free_space_ids = NR_SPACE_IDS - 1; | |
866 | static unsigned long dirty_space_ids = 0; | |
867 | ||
868 | static DEFINE_SPINLOCK(sid_lock); | |
869 | ||
870 | unsigned long alloc_sid(void) | |
871 | { | |
872 | unsigned long index; | |
873 | ||
874 | spin_lock(&sid_lock); | |
875 | ||
876 | if (free_space_ids == 0) { | |
877 | if (dirty_space_ids != 0) { | |
878 | spin_unlock(&sid_lock); | |
879 | flush_tlb_all(); /* flush_tlb_all() calls recycle_sids() */ | |
880 | spin_lock(&sid_lock); | |
881 | } | |
2fd83038 | 882 | BUG_ON(free_space_ids == 0); |
1da177e4 LT |
883 | } |
884 | ||
885 | free_space_ids--; | |
886 | ||
887 | index = find_next_zero_bit(space_id, NR_SPACE_IDS, space_id_index); | |
888 | space_id[index >> SHIFT_PER_LONG] |= (1L << (index & (BITS_PER_LONG - 1))); | |
889 | space_id_index = index; | |
890 | ||
891 | spin_unlock(&sid_lock); | |
892 | ||
893 | return index << SPACEID_SHIFT; | |
894 | } | |
895 | ||
896 | void free_sid(unsigned long spaceid) | |
897 | { | |
898 | unsigned long index = spaceid >> SPACEID_SHIFT; | |
899 | unsigned long *dirty_space_offset; | |
900 | ||
901 | dirty_space_offset = dirty_space_id + (index >> SHIFT_PER_LONG); | |
902 | index &= (BITS_PER_LONG - 1); | |
903 | ||
904 | spin_lock(&sid_lock); | |
905 | ||
2fd83038 | 906 | BUG_ON(*dirty_space_offset & (1L << index)); /* attempt to free space id twice */ |
1da177e4 LT |
907 | |
908 | *dirty_space_offset |= (1L << index); | |
909 | dirty_space_ids++; | |
910 | ||
911 | spin_unlock(&sid_lock); | |
912 | } | |
913 | ||
914 | ||
915 | #ifdef CONFIG_SMP | |
916 | static void get_dirty_sids(unsigned long *ndirtyptr,unsigned long *dirty_array) | |
917 | { | |
918 | int i; | |
919 | ||
920 | /* NOTE: sid_lock must be held upon entry */ | |
921 | ||
922 | *ndirtyptr = dirty_space_ids; | |
923 | if (dirty_space_ids != 0) { | |
924 | for (i = 0; i < SID_ARRAY_SIZE; i++) { | |
925 | dirty_array[i] = dirty_space_id[i]; | |
926 | dirty_space_id[i] = 0; | |
927 | } | |
928 | dirty_space_ids = 0; | |
929 | } | |
930 | ||
931 | return; | |
932 | } | |
933 | ||
934 | static void recycle_sids(unsigned long ndirty,unsigned long *dirty_array) | |
935 | { | |
936 | int i; | |
937 | ||
938 | /* NOTE: sid_lock must be held upon entry */ | |
939 | ||
940 | if (ndirty != 0) { | |
941 | for (i = 0; i < SID_ARRAY_SIZE; i++) { | |
942 | space_id[i] ^= dirty_array[i]; | |
943 | } | |
944 | ||
945 | free_space_ids += ndirty; | |
946 | space_id_index = 0; | |
947 | } | |
948 | } | |
949 | ||
950 | #else /* CONFIG_SMP */ | |
951 | ||
952 | static void recycle_sids(void) | |
953 | { | |
954 | int i; | |
955 | ||
956 | /* NOTE: sid_lock must be held upon entry */ | |
957 | ||
958 | if (dirty_space_ids != 0) { | |
959 | for (i = 0; i < SID_ARRAY_SIZE; i++) { | |
960 | space_id[i] ^= dirty_space_id[i]; | |
961 | dirty_space_id[i] = 0; | |
962 | } | |
963 | ||
964 | free_space_ids += dirty_space_ids; | |
965 | dirty_space_ids = 0; | |
966 | space_id_index = 0; | |
967 | } | |
968 | } | |
969 | #endif | |
970 | ||
971 | /* | |
972 | * flush_tlb_all() calls recycle_sids(), since whenever the entire tlb is | |
973 | * purged, we can safely reuse the space ids that were released but | |
974 | * not flushed from the tlb. | |
975 | */ | |
976 | ||
977 | #ifdef CONFIG_SMP | |
978 | ||
979 | static unsigned long recycle_ndirty; | |
980 | static unsigned long recycle_dirty_array[SID_ARRAY_SIZE]; | |
2fd83038 | 981 | static unsigned int recycle_inuse; |
1da177e4 LT |
982 | |
983 | void flush_tlb_all(void) | |
984 | { | |
985 | int do_recycle; | |
986 | ||
987 | do_recycle = 0; | |
988 | spin_lock(&sid_lock); | |
989 | if (dirty_space_ids > RECYCLE_THRESHOLD) { | |
2fd83038 | 990 | BUG_ON(recycle_inuse); /* FIXME: Use a semaphore/wait queue here */ |
1da177e4 LT |
991 | get_dirty_sids(&recycle_ndirty,recycle_dirty_array); |
992 | recycle_inuse++; | |
993 | do_recycle++; | |
994 | } | |
995 | spin_unlock(&sid_lock); | |
ce33941f | 996 | on_each_cpu(flush_tlb_all_local, NULL, 1, 1); |
1da177e4 LT |
997 | if (do_recycle) { |
998 | spin_lock(&sid_lock); | |
999 | recycle_sids(recycle_ndirty,recycle_dirty_array); | |
1000 | recycle_inuse = 0; | |
1001 | spin_unlock(&sid_lock); | |
1002 | } | |
1003 | } | |
1004 | #else | |
1005 | void flush_tlb_all(void) | |
1006 | { | |
1007 | spin_lock(&sid_lock); | |
1b2425e3 | 1008 | flush_tlb_all_local(NULL); |
1da177e4 LT |
1009 | recycle_sids(); |
1010 | spin_unlock(&sid_lock); | |
1011 | } | |
1012 | #endif | |
1013 | ||
1014 | #ifdef CONFIG_BLK_DEV_INITRD | |
1015 | void free_initrd_mem(unsigned long start, unsigned long end) | |
1016 | { | |
94c3e87a HD |
1017 | if (start >= end) |
1018 | return; | |
1019 | printk(KERN_INFO "Freeing initrd memory: %ldk freed\n", (end - start) >> 10); | |
1da177e4 LT |
1020 | for (; start < end; start += PAGE_SIZE) { |
1021 | ClearPageReserved(virt_to_page(start)); | |
7835e98b | 1022 | init_page_count(virt_to_page(start)); |
1da177e4 LT |
1023 | free_page(start); |
1024 | num_physpages++; | |
1025 | totalram_pages++; | |
1026 | } | |
1da177e4 LT |
1027 | } |
1028 | #endif |