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) | |
a8f44e38 | 9 | * Copyright 2006-2007 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> | |
5a0e3ad6 | 17 | #include <linux/gfp.h> |
1da177e4 LT |
18 | #include <linux/delay.h> |
19 | #include <linux/init.h> | |
20 | #include <linux/pci.h> /* for hppa_dma_ops and pcxl_dma_ops */ | |
21 | #include <linux/initrd.h> | |
22 | #include <linux/swap.h> | |
23 | #include <linux/unistd.h> | |
24 | #include <linux/nodemask.h> /* for node_online_map */ | |
25 | #include <linux/pagemap.h> /* for release_pages and page_cache_release */ | |
26 | ||
27 | #include <asm/pgalloc.h> | |
ce8420bb | 28 | #include <asm/pgtable.h> |
1da177e4 LT |
29 | #include <asm/tlb.h> |
30 | #include <asm/pdc_chassis.h> | |
31 | #include <asm/mmzone.h> | |
a581c2a4 | 32 | #include <asm/sections.h> |
1da177e4 | 33 | |
1da177e4 | 34 | extern int data_start; |
1da177e4 | 35 | |
c39f52a9 TG |
36 | #if PT_NLEVELS == 3 |
37 | /* NOTE: This layout exactly conforms to the hybrid L2/L3 page table layout | |
38 | * with the first pmd adjacent to the pgd and below it. gcc doesn't actually | |
39 | * guarantee that global objects will be laid out in memory in the same order | |
40 | * as the order of declaration, so put these in different sections and use | |
41 | * the linker script to order them. */ | |
42 | pmd_t pmd0[PTRS_PER_PMD] __attribute__ ((__section__ (".data..vm0.pmd"), aligned(PAGE_SIZE))); | |
43 | #endif | |
44 | ||
45 | pgd_t swapper_pg_dir[PTRS_PER_PGD] __attribute__ ((__section__ (".data..vm0.pgd"), aligned(PAGE_SIZE))); | |
46 | pte_t pg0[PT_INITIAL * PTRS_PER_PTE] __attribute__ ((__section__ (".data..vm0.pte"), aligned(PAGE_SIZE))); | |
47 | ||
1da177e4 | 48 | #ifdef CONFIG_DISCONTIGMEM |
8039de10 | 49 | struct node_map_data node_data[MAX_NUMNODES] __read_mostly; |
8039de10 | 50 | unsigned char pfnnid_map[PFNNID_MAP_MAX] __read_mostly; |
1da177e4 LT |
51 | #endif |
52 | ||
53 | static struct resource data_resource = { | |
54 | .name = "Kernel data", | |
55 | .flags = IORESOURCE_BUSY | IORESOURCE_MEM, | |
56 | }; | |
57 | ||
58 | static struct resource code_resource = { | |
59 | .name = "Kernel code", | |
60 | .flags = IORESOURCE_BUSY | IORESOURCE_MEM, | |
61 | }; | |
62 | ||
63 | static struct resource pdcdata_resource = { | |
64 | .name = "PDC data (Page Zero)", | |
65 | .start = 0, | |
66 | .end = 0x9ff, | |
67 | .flags = IORESOURCE_BUSY | IORESOURCE_MEM, | |
68 | }; | |
69 | ||
8039de10 | 70 | static struct resource sysram_resources[MAX_PHYSMEM_RANGES] __read_mostly; |
1da177e4 LT |
71 | |
72 | /* The following array is initialized from the firmware specific | |
73 | * information retrieved in kernel/inventory.c. | |
74 | */ | |
75 | ||
8039de10 HD |
76 | physmem_range_t pmem_ranges[MAX_PHYSMEM_RANGES] __read_mostly; |
77 | int npmem_ranges __read_mostly; | |
1da177e4 | 78 | |
a8f44e38 | 79 | #ifdef CONFIG_64BIT |
1da177e4 | 80 | #define MAX_MEM (~0UL) |
a8f44e38 | 81 | #else /* !CONFIG_64BIT */ |
1da177e4 | 82 | #define MAX_MEM (3584U*1024U*1024U) |
a8f44e38 | 83 | #endif /* !CONFIG_64BIT */ |
1da177e4 | 84 | |
8039de10 | 85 | static unsigned long mem_limit __read_mostly = MAX_MEM; |
1da177e4 LT |
86 | |
87 | static void __init mem_limit_func(void) | |
88 | { | |
89 | char *cp, *end; | |
90 | unsigned long limit; | |
1da177e4 LT |
91 | |
92 | /* We need this before __setup() functions are called */ | |
93 | ||
94 | limit = MAX_MEM; | |
668f9931 | 95 | for (cp = boot_command_line; *cp; ) { |
1da177e4 LT |
96 | if (memcmp(cp, "mem=", 4) == 0) { |
97 | cp += 4; | |
98 | limit = memparse(cp, &end); | |
99 | if (end != cp) | |
100 | break; | |
101 | cp = end; | |
102 | } else { | |
103 | while (*cp != ' ' && *cp) | |
104 | ++cp; | |
105 | while (*cp == ' ') | |
106 | ++cp; | |
107 | } | |
108 | } | |
109 | ||
110 | if (limit < mem_limit) | |
111 | mem_limit = limit; | |
112 | } | |
113 | ||
114 | #define MAX_GAP (0x40000000UL >> PAGE_SHIFT) | |
115 | ||
116 | static void __init setup_bootmem(void) | |
117 | { | |
118 | unsigned long bootmap_size; | |
119 | unsigned long mem_max; | |
120 | unsigned long bootmap_pages; | |
121 | unsigned long bootmap_start_pfn; | |
122 | unsigned long bootmap_pfn; | |
123 | #ifndef CONFIG_DISCONTIGMEM | |
124 | physmem_range_t pmem_holes[MAX_PHYSMEM_RANGES - 1]; | |
125 | int npmem_holes; | |
126 | #endif | |
127 | int i, sysram_resource_count; | |
128 | ||
129 | disable_sr_hashing(); /* Turn off space register hashing */ | |
130 | ||
131 | /* | |
132 | * Sort the ranges. Since the number of ranges is typically | |
133 | * small, and performance is not an issue here, just do | |
134 | * a simple insertion sort. | |
135 | */ | |
136 | ||
137 | for (i = 1; i < npmem_ranges; i++) { | |
138 | int j; | |
139 | ||
140 | for (j = i; j > 0; j--) { | |
141 | unsigned long tmp; | |
142 | ||
143 | if (pmem_ranges[j-1].start_pfn < | |
144 | pmem_ranges[j].start_pfn) { | |
145 | ||
146 | break; | |
147 | } | |
148 | tmp = pmem_ranges[j-1].start_pfn; | |
149 | pmem_ranges[j-1].start_pfn = pmem_ranges[j].start_pfn; | |
150 | pmem_ranges[j].start_pfn = tmp; | |
151 | tmp = pmem_ranges[j-1].pages; | |
152 | pmem_ranges[j-1].pages = pmem_ranges[j].pages; | |
153 | pmem_ranges[j].pages = tmp; | |
154 | } | |
155 | } | |
156 | ||
157 | #ifndef CONFIG_DISCONTIGMEM | |
158 | /* | |
159 | * Throw out ranges that are too far apart (controlled by | |
160 | * MAX_GAP). | |
161 | */ | |
162 | ||
163 | for (i = 1; i < npmem_ranges; i++) { | |
164 | if (pmem_ranges[i].start_pfn - | |
165 | (pmem_ranges[i-1].start_pfn + | |
166 | pmem_ranges[i-1].pages) > MAX_GAP) { | |
167 | npmem_ranges = i; | |
168 | printk("Large gap in memory detected (%ld pages). " | |
169 | "Consider turning on CONFIG_DISCONTIGMEM\n", | |
170 | pmem_ranges[i].start_pfn - | |
171 | (pmem_ranges[i-1].start_pfn + | |
172 | pmem_ranges[i-1].pages)); | |
173 | break; | |
174 | } | |
175 | } | |
176 | #endif | |
177 | ||
178 | if (npmem_ranges > 1) { | |
179 | ||
180 | /* Print the memory ranges */ | |
181 | ||
182 | printk(KERN_INFO "Memory Ranges:\n"); | |
183 | ||
184 | for (i = 0; i < npmem_ranges; i++) { | |
185 | unsigned long start; | |
186 | unsigned long size; | |
187 | ||
188 | size = (pmem_ranges[i].pages << PAGE_SHIFT); | |
189 | start = (pmem_ranges[i].start_pfn << PAGE_SHIFT); | |
190 | printk(KERN_INFO "%2d) Start 0x%016lx End 0x%016lx Size %6ld MB\n", | |
191 | i,start, start + (size - 1), size >> 20); | |
192 | } | |
193 | } | |
194 | ||
195 | sysram_resource_count = npmem_ranges; | |
196 | for (i = 0; i < sysram_resource_count; i++) { | |
197 | struct resource *res = &sysram_resources[i]; | |
198 | res->name = "System RAM"; | |
199 | res->start = pmem_ranges[i].start_pfn << PAGE_SHIFT; | |
200 | res->end = res->start + (pmem_ranges[i].pages << PAGE_SHIFT)-1; | |
201 | res->flags = IORESOURCE_MEM | IORESOURCE_BUSY; | |
202 | request_resource(&iomem_resource, res); | |
203 | } | |
204 | ||
205 | /* | |
206 | * For 32 bit kernels we limit the amount of memory we can | |
207 | * support, in order to preserve enough kernel address space | |
208 | * for other purposes. For 64 bit kernels we don't normally | |
209 | * limit the memory, but this mechanism can be used to | |
210 | * artificially limit the amount of memory (and it is written | |
211 | * to work with multiple memory ranges). | |
212 | */ | |
213 | ||
214 | mem_limit_func(); /* check for "mem=" argument */ | |
215 | ||
216 | mem_max = 0; | |
217 | num_physpages = 0; | |
218 | for (i = 0; i < npmem_ranges; i++) { | |
219 | unsigned long rsize; | |
220 | ||
221 | rsize = pmem_ranges[i].pages << PAGE_SHIFT; | |
222 | if ((mem_max + rsize) > mem_limit) { | |
223 | printk(KERN_WARNING "Memory truncated to %ld MB\n", mem_limit >> 20); | |
224 | if (mem_max == mem_limit) | |
225 | npmem_ranges = i; | |
226 | else { | |
227 | pmem_ranges[i].pages = (mem_limit >> PAGE_SHIFT) | |
228 | - (mem_max >> PAGE_SHIFT); | |
229 | npmem_ranges = i + 1; | |
230 | mem_max = mem_limit; | |
231 | } | |
232 | num_physpages += pmem_ranges[i].pages; | |
233 | break; | |
234 | } | |
235 | num_physpages += pmem_ranges[i].pages; | |
236 | mem_max += rsize; | |
237 | } | |
238 | ||
239 | printk(KERN_INFO "Total Memory: %ld MB\n",mem_max >> 20); | |
240 | ||
241 | #ifndef CONFIG_DISCONTIGMEM | |
242 | /* Merge the ranges, keeping track of the holes */ | |
243 | ||
244 | { | |
245 | unsigned long end_pfn; | |
246 | unsigned long hole_pages; | |
247 | ||
248 | npmem_holes = 0; | |
249 | end_pfn = pmem_ranges[0].start_pfn + pmem_ranges[0].pages; | |
250 | for (i = 1; i < npmem_ranges; i++) { | |
251 | ||
252 | hole_pages = pmem_ranges[i].start_pfn - end_pfn; | |
253 | if (hole_pages) { | |
254 | pmem_holes[npmem_holes].start_pfn = end_pfn; | |
255 | pmem_holes[npmem_holes++].pages = hole_pages; | |
256 | end_pfn += hole_pages; | |
257 | } | |
258 | end_pfn += pmem_ranges[i].pages; | |
259 | } | |
260 | ||
261 | pmem_ranges[0].pages = end_pfn - pmem_ranges[0].start_pfn; | |
262 | npmem_ranges = 1; | |
263 | } | |
264 | #endif | |
265 | ||
266 | bootmap_pages = 0; | |
267 | for (i = 0; i < npmem_ranges; i++) | |
268 | bootmap_pages += bootmem_bootmap_pages(pmem_ranges[i].pages); | |
269 | ||
270 | bootmap_start_pfn = PAGE_ALIGN(__pa((unsigned long) &_end)) >> PAGE_SHIFT; | |
271 | ||
272 | #ifdef CONFIG_DISCONTIGMEM | |
273 | for (i = 0; i < MAX_PHYSMEM_RANGES; i++) { | |
274 | memset(NODE_DATA(i), 0, sizeof(pg_data_t)); | |
b61bfa3c | 275 | NODE_DATA(i)->bdata = &bootmem_node_data[i]; |
1da177e4 LT |
276 | } |
277 | memset(pfnnid_map, 0xff, sizeof(pfnnid_map)); | |
278 | ||
d9b41e0b DR |
279 | for (i = 0; i < npmem_ranges; i++) { |
280 | node_set_state(i, N_NORMAL_MEMORY); | |
1da177e4 | 281 | node_set_online(i); |
d9b41e0b | 282 | } |
1da177e4 LT |
283 | #endif |
284 | ||
285 | /* | |
286 | * Initialize and free the full range of memory in each range. | |
287 | * Note that the only writing these routines do are to the bootmap, | |
288 | * and we've made sure to locate the bootmap properly so that they | |
289 | * won't be writing over anything important. | |
290 | */ | |
291 | ||
292 | bootmap_pfn = bootmap_start_pfn; | |
293 | max_pfn = 0; | |
294 | for (i = 0; i < npmem_ranges; i++) { | |
295 | unsigned long start_pfn; | |
296 | unsigned long npages; | |
297 | ||
298 | start_pfn = pmem_ranges[i].start_pfn; | |
299 | npages = pmem_ranges[i].pages; | |
300 | ||
301 | bootmap_size = init_bootmem_node(NODE_DATA(i), | |
302 | bootmap_pfn, | |
303 | start_pfn, | |
304 | (start_pfn + npages) ); | |
305 | free_bootmem_node(NODE_DATA(i), | |
306 | (start_pfn << PAGE_SHIFT), | |
307 | (npages << PAGE_SHIFT) ); | |
308 | bootmap_pfn += (bootmap_size + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
309 | if ((start_pfn + npages) > max_pfn) | |
310 | max_pfn = start_pfn + npages; | |
311 | } | |
312 | ||
5cdb8205 GG |
313 | /* IOMMU is always used to access "high mem" on those boxes |
314 | * that can support enough mem that a PCI device couldn't | |
315 | * directly DMA to any physical addresses. | |
316 | * ISA DMA support will need to revisit this. | |
317 | */ | |
318 | max_low_pfn = max_pfn; | |
319 | ||
8980a7ba HD |
320 | /* bootmap sizing messed up? */ |
321 | BUG_ON((bootmap_pfn - bootmap_start_pfn) != bootmap_pages); | |
1da177e4 LT |
322 | |
323 | /* reserve PAGE0 pdc memory, kernel text/data/bss & bootmap */ | |
324 | ||
325 | #define PDC_CONSOLE_IO_IODC_SIZE 32768 | |
326 | ||
327 | reserve_bootmem_node(NODE_DATA(0), 0UL, | |
72a7fe39 BW |
328 | (unsigned long)(PAGE0->mem_free + |
329 | PDC_CONSOLE_IO_IODC_SIZE), BOOTMEM_DEFAULT); | |
c51d476a | 330 | reserve_bootmem_node(NODE_DATA(0), __pa((unsigned long)_text), |
72a7fe39 | 331 | (unsigned long)(_end - _text), BOOTMEM_DEFAULT); |
1da177e4 | 332 | reserve_bootmem_node(NODE_DATA(0), (bootmap_start_pfn << PAGE_SHIFT), |
72a7fe39 BW |
333 | ((bootmap_pfn - bootmap_start_pfn) << PAGE_SHIFT), |
334 | BOOTMEM_DEFAULT); | |
1da177e4 LT |
335 | |
336 | #ifndef CONFIG_DISCONTIGMEM | |
337 | ||
338 | /* reserve the holes */ | |
339 | ||
340 | for (i = 0; i < npmem_holes; i++) { | |
341 | reserve_bootmem_node(NODE_DATA(0), | |
342 | (pmem_holes[i].start_pfn << PAGE_SHIFT), | |
72a7fe39 BW |
343 | (pmem_holes[i].pages << PAGE_SHIFT), |
344 | BOOTMEM_DEFAULT); | |
1da177e4 LT |
345 | } |
346 | #endif | |
347 | ||
348 | #ifdef CONFIG_BLK_DEV_INITRD | |
349 | if (initrd_start) { | |
350 | printk(KERN_INFO "initrd: %08lx-%08lx\n", initrd_start, initrd_end); | |
351 | if (__pa(initrd_start) < mem_max) { | |
352 | unsigned long initrd_reserve; | |
353 | ||
354 | if (__pa(initrd_end) > mem_max) { | |
355 | initrd_reserve = mem_max - __pa(initrd_start); | |
356 | } else { | |
357 | initrd_reserve = initrd_end - initrd_start; | |
358 | } | |
359 | initrd_below_start_ok = 1; | |
360 | printk(KERN_INFO "initrd: reserving %08lx-%08lx (mem_max %08lx)\n", __pa(initrd_start), __pa(initrd_start) + initrd_reserve, mem_max); | |
361 | ||
72a7fe39 BW |
362 | reserve_bootmem_node(NODE_DATA(0), __pa(initrd_start), |
363 | initrd_reserve, BOOTMEM_DEFAULT); | |
1da177e4 LT |
364 | } |
365 | } | |
366 | #endif | |
367 | ||
368 | data_resource.start = virt_to_phys(&data_start); | |
c51d476a KM |
369 | data_resource.end = virt_to_phys(_end) - 1; |
370 | code_resource.start = virt_to_phys(_text); | |
1da177e4 LT |
371 | code_resource.end = virt_to_phys(&data_start)-1; |
372 | ||
373 | /* We don't know which region the kernel will be in, so try | |
374 | * all of them. | |
375 | */ | |
376 | for (i = 0; i < sysram_resource_count; i++) { | |
377 | struct resource *res = &sysram_resources[i]; | |
378 | request_resource(res, &code_resource); | |
379 | request_resource(res, &data_resource); | |
380 | } | |
381 | request_resource(&sysram_resources[0], &pdcdata_resource); | |
382 | } | |
383 | ||
d7dd2ff1 JB |
384 | static void __init map_pages(unsigned long start_vaddr, |
385 | unsigned long start_paddr, unsigned long size, | |
386 | pgprot_t pgprot, int force) | |
387 | { | |
388 | pgd_t *pg_dir; | |
389 | pmd_t *pmd; | |
390 | pte_t *pg_table; | |
391 | unsigned long end_paddr; | |
392 | unsigned long start_pmd; | |
393 | unsigned long start_pte; | |
394 | unsigned long tmp1; | |
395 | unsigned long tmp2; | |
396 | unsigned long address; | |
397 | unsigned long vaddr; | |
398 | unsigned long ro_start; | |
399 | unsigned long ro_end; | |
400 | unsigned long fv_addr; | |
401 | unsigned long gw_addr; | |
402 | extern const unsigned long fault_vector_20; | |
403 | extern void * const linux_gateway_page; | |
404 | ||
405 | ro_start = __pa((unsigned long)_text); | |
406 | ro_end = __pa((unsigned long)&data_start); | |
407 | fv_addr = __pa((unsigned long)&fault_vector_20) & PAGE_MASK; | |
408 | gw_addr = __pa((unsigned long)&linux_gateway_page) & PAGE_MASK; | |
409 | ||
410 | end_paddr = start_paddr + size; | |
411 | ||
412 | pg_dir = pgd_offset_k(start_vaddr); | |
413 | ||
414 | #if PTRS_PER_PMD == 1 | |
415 | start_pmd = 0; | |
416 | #else | |
417 | start_pmd = ((start_vaddr >> PMD_SHIFT) & (PTRS_PER_PMD - 1)); | |
418 | #endif | |
419 | start_pte = ((start_vaddr >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)); | |
420 | ||
421 | address = start_paddr; | |
422 | vaddr = start_vaddr; | |
423 | while (address < end_paddr) { | |
424 | #if PTRS_PER_PMD == 1 | |
425 | pmd = (pmd_t *)__pa(pg_dir); | |
426 | #else | |
427 | pmd = (pmd_t *)pgd_address(*pg_dir); | |
428 | ||
429 | /* | |
430 | * pmd is physical at this point | |
431 | */ | |
432 | ||
433 | if (!pmd) { | |
434 | pmd = (pmd_t *) alloc_bootmem_low_pages_node(NODE_DATA(0), PAGE_SIZE << PMD_ORDER); | |
435 | pmd = (pmd_t *) __pa(pmd); | |
436 | } | |
437 | ||
438 | pgd_populate(NULL, pg_dir, __va(pmd)); | |
439 | #endif | |
440 | pg_dir++; | |
441 | ||
442 | /* now change pmd to kernel virtual addresses */ | |
443 | ||
444 | pmd = (pmd_t *)__va(pmd) + start_pmd; | |
445 | for (tmp1 = start_pmd; tmp1 < PTRS_PER_PMD; tmp1++, pmd++) { | |
446 | ||
447 | /* | |
448 | * pg_table is physical at this point | |
449 | */ | |
450 | ||
451 | pg_table = (pte_t *)pmd_address(*pmd); | |
452 | if (!pg_table) { | |
453 | pg_table = (pte_t *) | |
454 | alloc_bootmem_low_pages_node(NODE_DATA(0), PAGE_SIZE); | |
455 | pg_table = (pte_t *) __pa(pg_table); | |
456 | } | |
457 | ||
458 | pmd_populate_kernel(NULL, pmd, __va(pg_table)); | |
459 | ||
460 | /* now change pg_table to kernel virtual addresses */ | |
461 | ||
462 | pg_table = (pte_t *) __va(pg_table) + start_pte; | |
463 | for (tmp2 = start_pte; tmp2 < PTRS_PER_PTE; tmp2++, pg_table++) { | |
464 | pte_t pte; | |
465 | ||
466 | /* | |
467 | * Map the fault vector writable so we can | |
468 | * write the HPMC checksum. | |
469 | */ | |
470 | if (force) | |
471 | pte = __mk_pte(address, pgprot); | |
472 | else if (core_kernel_text(vaddr) && | |
473 | address != fv_addr) | |
474 | pte = __mk_pte(address, PAGE_KERNEL_EXEC); | |
475 | else | |
476 | #if defined(CONFIG_PARISC_PAGE_SIZE_4KB) | |
477 | if (address >= ro_start && address < ro_end | |
478 | && address != fv_addr | |
479 | && address != gw_addr) | |
480 | pte = __mk_pte(address, PAGE_KERNEL_RO); | |
481 | else | |
482 | #endif | |
483 | pte = __mk_pte(address, pgprot); | |
484 | ||
485 | if (address >= end_paddr) { | |
486 | if (force) | |
487 | break; | |
488 | else | |
489 | pte_val(pte) = 0; | |
490 | } | |
491 | ||
492 | set_pte(pg_table, pte); | |
493 | ||
494 | address += PAGE_SIZE; | |
495 | vaddr += PAGE_SIZE; | |
496 | } | |
497 | start_pte = 0; | |
498 | ||
499 | if (address >= end_paddr) | |
500 | break; | |
501 | } | |
502 | start_pmd = 0; | |
503 | } | |
504 | } | |
505 | ||
1da177e4 LT |
506 | void free_initmem(void) |
507 | { | |
4fb11781 KM |
508 | unsigned long init_begin = (unsigned long)__init_begin; |
509 | unsigned long init_end = (unsigned long)__init_end; | |
1da177e4 | 510 | |
d7dd2ff1 JB |
511 | /* The init text pages are marked R-X. We have to |
512 | * flush the icache and mark them RW- | |
513 | * | |
514 | * This is tricky, because map_pages is in the init section. | |
515 | * Do a dummy remap of the data section first (the data | |
516 | * section is already PAGE_KERNEL) to pull in the TLB entries | |
517 | * for map_kernel */ | |
518 | map_pages(init_begin, __pa(init_begin), init_end - init_begin, | |
519 | PAGE_KERNEL_RWX, 1); | |
520 | /* now remap at PAGE_KERNEL since the TLB is pre-primed to execute | |
521 | * map_pages */ | |
522 | map_pages(init_begin, __pa(init_begin), init_end - init_begin, | |
523 | PAGE_KERNEL, 1); | |
524 | ||
525 | /* force the kernel to see the new TLB entries */ | |
526 | __flush_tlb_range(0, init_begin, init_end); | |
1da177e4 LT |
527 | /* Attempt to catch anyone trying to execute code here |
528 | * by filling the page with BRK insns. | |
1da177e4 | 529 | */ |
20dbc9f7 | 530 | memset((void *)init_begin, 0x00, init_end - init_begin); |
d7dd2ff1 JB |
531 | /* finally dump all the instructions which were cached, since the |
532 | * pages are no-longer executable */ | |
4fb11781 | 533 | flush_icache_range(init_begin, init_end); |
1da177e4 | 534 | |
d3e5351b | 535 | num_physpages += free_initmem_default(0); |
1da177e4 LT |
536 | |
537 | /* set up a new led state on systems shipped LED State panel */ | |
538 | pdc_chassis_send_status(PDC_CHASSIS_DIRECT_BCOMPLETE); | |
1da177e4 LT |
539 | } |
540 | ||
1bcdd854 HD |
541 | |
542 | #ifdef CONFIG_DEBUG_RODATA | |
543 | void mark_rodata_ro(void) | |
544 | { | |
1bcdd854 HD |
545 | /* rodata memory was already mapped with KERNEL_RO access rights by |
546 | pagetable_init() and map_pages(). No need to do additional stuff here */ | |
547 | printk (KERN_INFO "Write protecting the kernel read-only data: %luk\n", | |
a581c2a4 | 548 | (unsigned long)(__end_rodata - __start_rodata) >> 10); |
1bcdd854 HD |
549 | } |
550 | #endif | |
551 | ||
552 | ||
1da177e4 LT |
553 | /* |
554 | * Just an arbitrary offset to serve as a "hole" between mapping areas | |
555 | * (between top of physical memory and a potential pcxl dma mapping | |
556 | * area, and below the vmalloc mapping area). | |
557 | * | |
558 | * The current 32K value just means that there will be a 32K "hole" | |
559 | * between mapping areas. That means that any out-of-bounds memory | |
560 | * accesses will hopefully be caught. The vmalloc() routines leaves | |
561 | * a hole of 4kB between each vmalloced area for the same reason. | |
562 | */ | |
563 | ||
564 | /* Leave room for gateway page expansion */ | |
565 | #if KERNEL_MAP_START < GATEWAY_PAGE_SIZE | |
566 | #error KERNEL_MAP_START is in gateway reserved region | |
567 | #endif | |
568 | #define MAP_START (KERNEL_MAP_START) | |
569 | ||
570 | #define VM_MAP_OFFSET (32*1024) | |
571 | #define SET_MAP_OFFSET(x) ((void *)(((unsigned long)(x) + VM_MAP_OFFSET) \ | |
572 | & ~(VM_MAP_OFFSET-1))) | |
573 | ||
4255f0d2 HD |
574 | void *parisc_vmalloc_start __read_mostly; |
575 | EXPORT_SYMBOL(parisc_vmalloc_start); | |
1da177e4 LT |
576 | |
577 | #ifdef CONFIG_PA11 | |
8039de10 | 578 | unsigned long pcxl_dma_start __read_mostly; |
1da177e4 LT |
579 | #endif |
580 | ||
581 | void __init mem_init(void) | |
582 | { | |
ce8420bb | 583 | int codesize, reservedpages, datasize, initsize; |
ce8420bb | 584 | |
48d27cb2 HD |
585 | /* Do sanity checks on page table constants */ |
586 | BUILD_BUG_ON(PTE_ENTRY_SIZE != sizeof(pte_t)); | |
587 | BUILD_BUG_ON(PMD_ENTRY_SIZE != sizeof(pmd_t)); | |
588 | BUILD_BUG_ON(PGD_ENTRY_SIZE != sizeof(pgd_t)); | |
589 | BUILD_BUG_ON(PAGE_SHIFT + BITS_PER_PTE + BITS_PER_PMD + BITS_PER_PGD | |
590 | > BITS_PER_LONG); | |
591 | ||
1da177e4 LT |
592 | high_memory = __va((max_pfn << PAGE_SHIFT)); |
593 | ||
594 | #ifndef CONFIG_DISCONTIGMEM | |
595 | max_mapnr = page_to_pfn(virt_to_page(high_memory - 1)) + 1; | |
596 | totalram_pages += free_all_bootmem(); | |
597 | #else | |
598 | { | |
599 | int i; | |
600 | ||
601 | for (i = 0; i < npmem_ranges; i++) | |
602 | totalram_pages += free_all_bootmem_node(NODE_DATA(i)); | |
603 | } | |
604 | #endif | |
605 | ||
53faf291 KM |
606 | codesize = (unsigned long)_etext - (unsigned long)_text; |
607 | datasize = (unsigned long)_edata - (unsigned long)_etext; | |
608 | initsize = (unsigned long)__init_end - (unsigned long)__init_begin; | |
ce8420bb HD |
609 | |
610 | reservedpages = 0; | |
53faf291 KM |
611 | { |
612 | unsigned long pfn; | |
613 | #ifdef CONFIG_DISCONTIGMEM | |
614 | int i; | |
615 | ||
616 | for (i = 0; i < npmem_ranges; i++) { | |
617 | for (pfn = node_start_pfn(i); pfn < node_end_pfn(i); pfn++) { | |
618 | if (PageReserved(pfn_to_page(pfn))) | |
619 | reservedpages++; | |
620 | } | |
621 | } | |
622 | #else /* !CONFIG_DISCONTIGMEM */ | |
623 | for (pfn = 0; pfn < max_pfn; pfn++) { | |
ce8420bb HD |
624 | /* |
625 | * Only count reserved RAM pages | |
626 | */ | |
53faf291 | 627 | if (PageReserved(pfn_to_page(pfn))) |
ce8420bb | 628 | reservedpages++; |
53faf291 KM |
629 | } |
630 | #endif | |
631 | } | |
1da177e4 LT |
632 | |
633 | #ifdef CONFIG_PA11 | |
634 | if (hppa_dma_ops == &pcxl_dma_ops) { | |
635 | pcxl_dma_start = (unsigned long)SET_MAP_OFFSET(MAP_START); | |
4255f0d2 HD |
636 | parisc_vmalloc_start = SET_MAP_OFFSET(pcxl_dma_start |
637 | + PCXL_DMA_MAP_SIZE); | |
1da177e4 LT |
638 | } else { |
639 | pcxl_dma_start = 0; | |
4255f0d2 | 640 | parisc_vmalloc_start = SET_MAP_OFFSET(MAP_START); |
1da177e4 LT |
641 | } |
642 | #else | |
4255f0d2 | 643 | parisc_vmalloc_start = SET_MAP_OFFSET(MAP_START); |
1da177e4 LT |
644 | #endif |
645 | ||
53faf291 | 646 | printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, %dk reserved, %dk data, %dk init)\n", |
cc013a88 | 647 | nr_free_pages() << (PAGE_SHIFT-10), |
ce8420bb HD |
648 | num_physpages << (PAGE_SHIFT-10), |
649 | codesize >> 10, | |
650 | reservedpages << (PAGE_SHIFT-10), | |
651 | datasize >> 10, | |
53faf291 KM |
652 | initsize >> 10 |
653 | ); | |
ce8420bb HD |
654 | |
655 | #ifdef CONFIG_DEBUG_KERNEL /* double-sanity-check paranoia */ | |
656 | printk("virtual kernel memory layout:\n" | |
657 | " vmalloc : 0x%p - 0x%p (%4ld MB)\n" | |
53faf291 | 658 | " memory : 0x%p - 0x%p (%4ld MB)\n" |
ce8420bb HD |
659 | " .init : 0x%p - 0x%p (%4ld kB)\n" |
660 | " .data : 0x%p - 0x%p (%4ld kB)\n" | |
661 | " .text : 0x%p - 0x%p (%4ld kB)\n", | |
662 | ||
663 | (void*)VMALLOC_START, (void*)VMALLOC_END, | |
664 | (VMALLOC_END - VMALLOC_START) >> 20, | |
665 | ||
666 | __va(0), high_memory, | |
667 | ((unsigned long)high_memory - (unsigned long)__va(0)) >> 20, | |
668 | ||
53faf291 KM |
669 | __init_begin, __init_end, |
670 | ((unsigned long)__init_end - (unsigned long)__init_begin) >> 10, | |
ce8420bb | 671 | |
53faf291 KM |
672 | _etext, _edata, |
673 | ((unsigned long)_edata - (unsigned long)_etext) >> 10, | |
ce8420bb | 674 | |
53faf291 KM |
675 | _text, _etext, |
676 | ((unsigned long)_etext - (unsigned long)_text) >> 10); | |
ce8420bb | 677 | #endif |
1da177e4 LT |
678 | } |
679 | ||
8039de10 | 680 | unsigned long *empty_zero_page __read_mostly; |
22febf1f | 681 | EXPORT_SYMBOL(empty_zero_page); |
1da177e4 | 682 | |
b2b755b5 | 683 | void show_mem(unsigned int filter) |
1da177e4 LT |
684 | { |
685 | int i,free = 0,total = 0,reserved = 0; | |
686 | int shared = 0, cached = 0; | |
687 | ||
688 | printk(KERN_INFO "Mem-info:\n"); | |
7bf02ea2 | 689 | show_free_areas(filter); |
4b59e6c4 DR |
690 | if (filter & SHOW_MEM_FILTER_PAGE_COUNT) |
691 | return; | |
1da177e4 LT |
692 | #ifndef CONFIG_DISCONTIGMEM |
693 | i = max_mapnr; | |
694 | while (i-- > 0) { | |
695 | total++; | |
696 | if (PageReserved(mem_map+i)) | |
697 | reserved++; | |
698 | else if (PageSwapCache(mem_map+i)) | |
699 | cached++; | |
700 | else if (!page_count(&mem_map[i])) | |
701 | free++; | |
702 | else | |
703 | shared += page_count(&mem_map[i]) - 1; | |
704 | } | |
705 | #else | |
706 | for (i = 0; i < npmem_ranges; i++) { | |
707 | int j; | |
708 | ||
709 | for (j = node_start_pfn(i); j < node_end_pfn(i); j++) { | |
710 | struct page *p; | |
208d54e5 | 711 | unsigned long flags; |
1da177e4 | 712 | |
208d54e5 | 713 | pgdat_resize_lock(NODE_DATA(i), &flags); |
408fde81 | 714 | p = nid_page_nr(i, j) - node_start_pfn(i); |
1da177e4 LT |
715 | |
716 | total++; | |
717 | if (PageReserved(p)) | |
718 | reserved++; | |
719 | else if (PageSwapCache(p)) | |
720 | cached++; | |
721 | else if (!page_count(p)) | |
722 | free++; | |
723 | else | |
724 | shared += page_count(p) - 1; | |
208d54e5 | 725 | pgdat_resize_unlock(NODE_DATA(i), &flags); |
1da177e4 LT |
726 | } |
727 | } | |
728 | #endif | |
729 | printk(KERN_INFO "%d pages of RAM\n", total); | |
730 | printk(KERN_INFO "%d reserved pages\n", reserved); | |
731 | printk(KERN_INFO "%d pages shared\n", shared); | |
732 | printk(KERN_INFO "%d pages swap cached\n", cached); | |
733 | ||
734 | ||
735 | #ifdef CONFIG_DISCONTIGMEM | |
736 | { | |
737 | struct zonelist *zl; | |
54a6eb5c | 738 | int i, j; |
1da177e4 LT |
739 | |
740 | for (i = 0; i < npmem_ranges; i++) { | |
4413a0f6 | 741 | zl = node_zonelist(i, 0); |
1da177e4 | 742 | for (j = 0; j < MAX_NR_ZONES; j++) { |
dd1a239f | 743 | struct zoneref *z; |
54a6eb5c | 744 | struct zone *zone; |
1da177e4 LT |
745 | |
746 | printk("Zone list for zone %d on node %d: ", j, i); | |
54a6eb5c MG |
747 | for_each_zone_zonelist(zone, z, zl, j) |
748 | printk("[%d/%s] ", zone_to_nid(zone), | |
749 | zone->name); | |
1da177e4 LT |
750 | printk("\n"); |
751 | } | |
752 | } | |
753 | } | |
754 | #endif | |
755 | } | |
756 | ||
1da177e4 LT |
757 | /* |
758 | * pagetable_init() sets up the page tables | |
759 | * | |
760 | * Note that gateway_init() places the Linux gateway page at page 0. | |
761 | * Since gateway pages cannot be dereferenced this has the desirable | |
762 | * side effect of trapping those pesky NULL-reference errors in the | |
763 | * kernel. | |
764 | */ | |
765 | static void __init pagetable_init(void) | |
766 | { | |
767 | int range; | |
768 | ||
769 | /* Map each physical memory range to its kernel vaddr */ | |
770 | ||
771 | for (range = 0; range < npmem_ranges; range++) { | |
772 | unsigned long start_paddr; | |
773 | unsigned long end_paddr; | |
774 | unsigned long size; | |
775 | ||
776 | start_paddr = pmem_ranges[range].start_pfn << PAGE_SHIFT; | |
777 | end_paddr = start_paddr + (pmem_ranges[range].pages << PAGE_SHIFT); | |
778 | size = pmem_ranges[range].pages << PAGE_SHIFT; | |
779 | ||
780 | map_pages((unsigned long)__va(start_paddr), start_paddr, | |
d7dd2ff1 | 781 | size, PAGE_KERNEL, 0); |
1da177e4 LT |
782 | } |
783 | ||
784 | #ifdef CONFIG_BLK_DEV_INITRD | |
785 | if (initrd_end && initrd_end > mem_limit) { | |
1bcdd854 | 786 | printk(KERN_INFO "initrd: mapping %08lx-%08lx\n", initrd_start, initrd_end); |
1da177e4 | 787 | map_pages(initrd_start, __pa(initrd_start), |
d7dd2ff1 | 788 | initrd_end - initrd_start, PAGE_KERNEL, 0); |
1da177e4 LT |
789 | } |
790 | #endif | |
791 | ||
792 | empty_zero_page = alloc_bootmem_pages(PAGE_SIZE); | |
793 | memset(empty_zero_page, 0, PAGE_SIZE); | |
794 | } | |
795 | ||
796 | static void __init gateway_init(void) | |
797 | { | |
798 | unsigned long linux_gateway_page_addr; | |
799 | /* FIXME: This is 'const' in order to trick the compiler | |
800 | into not treating it as DP-relative data. */ | |
801 | extern void * const linux_gateway_page; | |
802 | ||
803 | linux_gateway_page_addr = LINUX_GATEWAY_ADDR & PAGE_MASK; | |
804 | ||
805 | /* | |
806 | * Setup Linux Gateway page. | |
807 | * | |
808 | * The Linux gateway page will reside in kernel space (on virtual | |
809 | * page 0), so it doesn't need to be aliased into user space. | |
810 | */ | |
811 | ||
812 | map_pages(linux_gateway_page_addr, __pa(&linux_gateway_page), | |
d7dd2ff1 | 813 | PAGE_SIZE, PAGE_GATEWAY, 1); |
1da177e4 LT |
814 | } |
815 | ||
816 | #ifdef CONFIG_HPUX | |
817 | void | |
818 | map_hpux_gateway_page(struct task_struct *tsk, struct mm_struct *mm) | |
819 | { | |
820 | pgd_t *pg_dir; | |
821 | pmd_t *pmd; | |
822 | pte_t *pg_table; | |
823 | unsigned long start_pmd; | |
824 | unsigned long start_pte; | |
825 | unsigned long address; | |
826 | unsigned long hpux_gw_page_addr; | |
827 | /* FIXME: This is 'const' in order to trick the compiler | |
828 | into not treating it as DP-relative data. */ | |
829 | extern void * const hpux_gateway_page; | |
830 | ||
831 | hpux_gw_page_addr = HPUX_GATEWAY_ADDR & PAGE_MASK; | |
832 | ||
833 | /* | |
834 | * Setup HP-UX Gateway page. | |
835 | * | |
836 | * The HP-UX gateway page resides in the user address space, | |
837 | * so it needs to be aliased into each process. | |
838 | */ | |
839 | ||
840 | pg_dir = pgd_offset(mm,hpux_gw_page_addr); | |
841 | ||
842 | #if PTRS_PER_PMD == 1 | |
843 | start_pmd = 0; | |
844 | #else | |
845 | start_pmd = ((hpux_gw_page_addr >> PMD_SHIFT) & (PTRS_PER_PMD - 1)); | |
846 | #endif | |
847 | start_pte = ((hpux_gw_page_addr >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)); | |
848 | ||
849 | address = __pa(&hpux_gateway_page); | |
850 | #if PTRS_PER_PMD == 1 | |
851 | pmd = (pmd_t *)__pa(pg_dir); | |
852 | #else | |
853 | pmd = (pmd_t *) pgd_address(*pg_dir); | |
854 | ||
855 | /* | |
856 | * pmd is physical at this point | |
857 | */ | |
858 | ||
859 | if (!pmd) { | |
860 | pmd = (pmd_t *) get_zeroed_page(GFP_KERNEL); | |
861 | pmd = (pmd_t *) __pa(pmd); | |
862 | } | |
863 | ||
864 | __pgd_val_set(*pg_dir, PxD_FLAG_PRESENT | PxD_FLAG_VALID | (unsigned long) pmd); | |
865 | #endif | |
866 | /* now change pmd to kernel virtual addresses */ | |
867 | ||
868 | pmd = (pmd_t *)__va(pmd) + start_pmd; | |
869 | ||
870 | /* | |
871 | * pg_table is physical at this point | |
872 | */ | |
873 | ||
874 | pg_table = (pte_t *) pmd_address(*pmd); | |
875 | if (!pg_table) | |
876 | pg_table = (pte_t *) __pa(get_zeroed_page(GFP_KERNEL)); | |
877 | ||
878 | __pmd_val_set(*pmd, PxD_FLAG_PRESENT | PxD_FLAG_VALID | (unsigned long) pg_table); | |
879 | ||
880 | /* now change pg_table to kernel virtual addresses */ | |
881 | ||
882 | pg_table = (pte_t *) __va(pg_table) + start_pte; | |
883 | set_pte(pg_table, __mk_pte(address, PAGE_GATEWAY)); | |
884 | } | |
885 | EXPORT_SYMBOL(map_hpux_gateway_page); | |
886 | #endif | |
887 | ||
1da177e4 LT |
888 | void __init paging_init(void) |
889 | { | |
890 | int i; | |
891 | ||
892 | setup_bootmem(); | |
893 | pagetable_init(); | |
894 | gateway_init(); | |
895 | flush_cache_all_local(); /* start with known state */ | |
ce33941f | 896 | flush_tlb_all_local(NULL); |
1da177e4 LT |
897 | |
898 | for (i = 0; i < npmem_ranges; i++) { | |
f06a9684 | 899 | unsigned long zones_size[MAX_NR_ZONES] = { 0, }; |
1da177e4 | 900 | |
00592837 | 901 | zones_size[ZONE_NORMAL] = pmem_ranges[i].pages; |
1da177e4 LT |
902 | |
903 | #ifdef CONFIG_DISCONTIGMEM | |
904 | /* Need to initialize the pfnnid_map before we can initialize | |
905 | the zone */ | |
906 | { | |
907 | int j; | |
908 | for (j = (pmem_ranges[i].start_pfn >> PFNNID_SHIFT); | |
909 | j <= ((pmem_ranges[i].start_pfn + pmem_ranges[i].pages) >> PFNNID_SHIFT); | |
910 | j++) { | |
911 | pfnnid_map[j] = i; | |
912 | } | |
913 | } | |
914 | #endif | |
915 | ||
9109fb7b | 916 | free_area_init_node(i, zones_size, |
1da177e4 LT |
917 | pmem_ranges[i].start_pfn, NULL); |
918 | } | |
919 | } | |
920 | ||
921 | #ifdef CONFIG_PA20 | |
922 | ||
923 | /* | |
7022672e | 924 | * Currently, all PA20 chips have 18 bit protection IDs, which is the |
1da177e4 LT |
925 | * limiting factor (space ids are 32 bits). |
926 | */ | |
927 | ||
928 | #define NR_SPACE_IDS 262144 | |
929 | ||
930 | #else | |
931 | ||
932 | /* | |
7022672e SA |
933 | * Currently we have a one-to-one relationship between space IDs and |
934 | * protection IDs. Older parisc chips (PCXS, PCXT, PCXL, PCXL2) only | |
935 | * support 15 bit protection IDs, so that is the limiting factor. | |
936 | * PCXT' has 18 bit protection IDs, but only 16 bit spaceids, so it's | |
1da177e4 LT |
937 | * probably not worth the effort for a special case here. |
938 | */ | |
939 | ||
940 | #define NR_SPACE_IDS 32768 | |
941 | ||
942 | #endif /* !CONFIG_PA20 */ | |
943 | ||
944 | #define RECYCLE_THRESHOLD (NR_SPACE_IDS / 2) | |
945 | #define SID_ARRAY_SIZE (NR_SPACE_IDS / (8 * sizeof(long))) | |
946 | ||
947 | static unsigned long space_id[SID_ARRAY_SIZE] = { 1 }; /* disallow space 0 */ | |
948 | static unsigned long dirty_space_id[SID_ARRAY_SIZE]; | |
949 | static unsigned long space_id_index; | |
950 | static unsigned long free_space_ids = NR_SPACE_IDS - 1; | |
951 | static unsigned long dirty_space_ids = 0; | |
952 | ||
953 | static DEFINE_SPINLOCK(sid_lock); | |
954 | ||
955 | unsigned long alloc_sid(void) | |
956 | { | |
957 | unsigned long index; | |
958 | ||
959 | spin_lock(&sid_lock); | |
960 | ||
961 | if (free_space_ids == 0) { | |
962 | if (dirty_space_ids != 0) { | |
963 | spin_unlock(&sid_lock); | |
964 | flush_tlb_all(); /* flush_tlb_all() calls recycle_sids() */ | |
965 | spin_lock(&sid_lock); | |
966 | } | |
2fd83038 | 967 | BUG_ON(free_space_ids == 0); |
1da177e4 LT |
968 | } |
969 | ||
970 | free_space_ids--; | |
971 | ||
972 | index = find_next_zero_bit(space_id, NR_SPACE_IDS, space_id_index); | |
973 | space_id[index >> SHIFT_PER_LONG] |= (1L << (index & (BITS_PER_LONG - 1))); | |
974 | space_id_index = index; | |
975 | ||
976 | spin_unlock(&sid_lock); | |
977 | ||
978 | return index << SPACEID_SHIFT; | |
979 | } | |
980 | ||
981 | void free_sid(unsigned long spaceid) | |
982 | { | |
983 | unsigned long index = spaceid >> SPACEID_SHIFT; | |
984 | unsigned long *dirty_space_offset; | |
985 | ||
986 | dirty_space_offset = dirty_space_id + (index >> SHIFT_PER_LONG); | |
987 | index &= (BITS_PER_LONG - 1); | |
988 | ||
989 | spin_lock(&sid_lock); | |
990 | ||
2fd83038 | 991 | BUG_ON(*dirty_space_offset & (1L << index)); /* attempt to free space id twice */ |
1da177e4 LT |
992 | |
993 | *dirty_space_offset |= (1L << index); | |
994 | dirty_space_ids++; | |
995 | ||
996 | spin_unlock(&sid_lock); | |
997 | } | |
998 | ||
999 | ||
1000 | #ifdef CONFIG_SMP | |
1001 | static void get_dirty_sids(unsigned long *ndirtyptr,unsigned long *dirty_array) | |
1002 | { | |
1003 | int i; | |
1004 | ||
1005 | /* NOTE: sid_lock must be held upon entry */ | |
1006 | ||
1007 | *ndirtyptr = dirty_space_ids; | |
1008 | if (dirty_space_ids != 0) { | |
1009 | for (i = 0; i < SID_ARRAY_SIZE; i++) { | |
1010 | dirty_array[i] = dirty_space_id[i]; | |
1011 | dirty_space_id[i] = 0; | |
1012 | } | |
1013 | dirty_space_ids = 0; | |
1014 | } | |
1015 | ||
1016 | return; | |
1017 | } | |
1018 | ||
1019 | static void recycle_sids(unsigned long ndirty,unsigned long *dirty_array) | |
1020 | { | |
1021 | int i; | |
1022 | ||
1023 | /* NOTE: sid_lock must be held upon entry */ | |
1024 | ||
1025 | if (ndirty != 0) { | |
1026 | for (i = 0; i < SID_ARRAY_SIZE; i++) { | |
1027 | space_id[i] ^= dirty_array[i]; | |
1028 | } | |
1029 | ||
1030 | free_space_ids += ndirty; | |
1031 | space_id_index = 0; | |
1032 | } | |
1033 | } | |
1034 | ||
1035 | #else /* CONFIG_SMP */ | |
1036 | ||
1037 | static void recycle_sids(void) | |
1038 | { | |
1039 | int i; | |
1040 | ||
1041 | /* NOTE: sid_lock must be held upon entry */ | |
1042 | ||
1043 | if (dirty_space_ids != 0) { | |
1044 | for (i = 0; i < SID_ARRAY_SIZE; i++) { | |
1045 | space_id[i] ^= dirty_space_id[i]; | |
1046 | dirty_space_id[i] = 0; | |
1047 | } | |
1048 | ||
1049 | free_space_ids += dirty_space_ids; | |
1050 | dirty_space_ids = 0; | |
1051 | space_id_index = 0; | |
1052 | } | |
1053 | } | |
1054 | #endif | |
1055 | ||
1056 | /* | |
1057 | * flush_tlb_all() calls recycle_sids(), since whenever the entire tlb is | |
1058 | * purged, we can safely reuse the space ids that were released but | |
1059 | * not flushed from the tlb. | |
1060 | */ | |
1061 | ||
1062 | #ifdef CONFIG_SMP | |
1063 | ||
1064 | static unsigned long recycle_ndirty; | |
1065 | static unsigned long recycle_dirty_array[SID_ARRAY_SIZE]; | |
2fd83038 | 1066 | static unsigned int recycle_inuse; |
1da177e4 LT |
1067 | |
1068 | void flush_tlb_all(void) | |
1069 | { | |
1070 | int do_recycle; | |
1071 | ||
416821d3 | 1072 | __inc_irq_stat(irq_tlb_count); |
1da177e4 LT |
1073 | do_recycle = 0; |
1074 | spin_lock(&sid_lock); | |
1075 | if (dirty_space_ids > RECYCLE_THRESHOLD) { | |
2fd83038 | 1076 | BUG_ON(recycle_inuse); /* FIXME: Use a semaphore/wait queue here */ |
1da177e4 LT |
1077 | get_dirty_sids(&recycle_ndirty,recycle_dirty_array); |
1078 | recycle_inuse++; | |
1079 | do_recycle++; | |
1080 | } | |
1081 | spin_unlock(&sid_lock); | |
15c8b6c1 | 1082 | on_each_cpu(flush_tlb_all_local, NULL, 1); |
1da177e4 LT |
1083 | if (do_recycle) { |
1084 | spin_lock(&sid_lock); | |
1085 | recycle_sids(recycle_ndirty,recycle_dirty_array); | |
1086 | recycle_inuse = 0; | |
1087 | spin_unlock(&sid_lock); | |
1088 | } | |
1089 | } | |
1090 | #else | |
1091 | void flush_tlb_all(void) | |
1092 | { | |
416821d3 | 1093 | __inc_irq_stat(irq_tlb_count); |
1da177e4 | 1094 | spin_lock(&sid_lock); |
1b2425e3 | 1095 | flush_tlb_all_local(NULL); |
1da177e4 LT |
1096 | recycle_sids(); |
1097 | spin_unlock(&sid_lock); | |
1098 | } | |
1099 | #endif | |
1100 | ||
1101 | #ifdef CONFIG_BLK_DEV_INITRD | |
1102 | void free_initrd_mem(unsigned long start, unsigned long end) | |
1103 | { | |
d3e5351b | 1104 | num_physpages += free_reserved_area(start, end, 0, "initrd"); |
1da177e4 LT |
1105 | } |
1106 | #endif |