Commit | Line | Data |
---|---|---|
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 */ | |
d0cf62fb | 26 | #include <linux/compat.h> |
1da177e4 LT |
27 | |
28 | #include <asm/pgalloc.h> | |
ce8420bb | 29 | #include <asm/pgtable.h> |
1da177e4 LT |
30 | #include <asm/tlb.h> |
31 | #include <asm/pdc_chassis.h> | |
32 | #include <asm/mmzone.h> | |
a581c2a4 | 33 | #include <asm/sections.h> |
d0cf62fb | 34 | #include <asm/msgbuf.h> |
1da177e4 | 35 | |
1da177e4 | 36 | extern int data_start; |
161bd3bf | 37 | extern void parisc_kernel_start(void); /* Kernel entry point in head.S */ |
1da177e4 | 38 | |
f24ffde4 | 39 | #if CONFIG_PGTABLE_LEVELS == 3 |
c39f52a9 TG |
40 | /* NOTE: This layout exactly conforms to the hybrid L2/L3 page table layout |
41 | * with the first pmd adjacent to the pgd and below it. gcc doesn't actually | |
42 | * guarantee that global objects will be laid out in memory in the same order | |
43 | * as the order of declaration, so put these in different sections and use | |
44 | * the linker script to order them. */ | |
45 | pmd_t pmd0[PTRS_PER_PMD] __attribute__ ((__section__ (".data..vm0.pmd"), aligned(PAGE_SIZE))); | |
46 | #endif | |
47 | ||
48 | pgd_t swapper_pg_dir[PTRS_PER_PGD] __attribute__ ((__section__ (".data..vm0.pgd"), aligned(PAGE_SIZE))); | |
49 | pte_t pg0[PT_INITIAL * PTRS_PER_PTE] __attribute__ ((__section__ (".data..vm0.pte"), aligned(PAGE_SIZE))); | |
50 | ||
1da177e4 | 51 | #ifdef CONFIG_DISCONTIGMEM |
8039de10 | 52 | struct node_map_data node_data[MAX_NUMNODES] __read_mostly; |
91ea8207 | 53 | signed char pfnnid_map[PFNNID_MAP_MAX] __read_mostly; |
1da177e4 LT |
54 | #endif |
55 | ||
56 | static struct resource data_resource = { | |
57 | .name = "Kernel data", | |
58 | .flags = IORESOURCE_BUSY | IORESOURCE_MEM, | |
59 | }; | |
60 | ||
61 | static struct resource code_resource = { | |
62 | .name = "Kernel code", | |
63 | .flags = IORESOURCE_BUSY | IORESOURCE_MEM, | |
64 | }; | |
65 | ||
66 | static struct resource pdcdata_resource = { | |
67 | .name = "PDC data (Page Zero)", | |
68 | .start = 0, | |
69 | .end = 0x9ff, | |
70 | .flags = IORESOURCE_BUSY | IORESOURCE_MEM, | |
71 | }; | |
72 | ||
8039de10 | 73 | static struct resource sysram_resources[MAX_PHYSMEM_RANGES] __read_mostly; |
1da177e4 LT |
74 | |
75 | /* The following array is initialized from the firmware specific | |
76 | * information retrieved in kernel/inventory.c. | |
77 | */ | |
78 | ||
8039de10 HD |
79 | physmem_range_t pmem_ranges[MAX_PHYSMEM_RANGES] __read_mostly; |
80 | int npmem_ranges __read_mostly; | |
1da177e4 | 81 | |
a8f44e38 | 82 | #ifdef CONFIG_64BIT |
1da177e4 | 83 | #define MAX_MEM (~0UL) |
a8f44e38 | 84 | #else /* !CONFIG_64BIT */ |
1da177e4 | 85 | #define MAX_MEM (3584U*1024U*1024U) |
a8f44e38 | 86 | #endif /* !CONFIG_64BIT */ |
1da177e4 | 87 | |
8039de10 | 88 | static unsigned long mem_limit __read_mostly = MAX_MEM; |
1da177e4 LT |
89 | |
90 | static void __init mem_limit_func(void) | |
91 | { | |
92 | char *cp, *end; | |
93 | unsigned long limit; | |
1da177e4 LT |
94 | |
95 | /* We need this before __setup() functions are called */ | |
96 | ||
97 | limit = MAX_MEM; | |
668f9931 | 98 | for (cp = boot_command_line; *cp; ) { |
1da177e4 LT |
99 | if (memcmp(cp, "mem=", 4) == 0) { |
100 | cp += 4; | |
101 | limit = memparse(cp, &end); | |
102 | if (end != cp) | |
103 | break; | |
104 | cp = end; | |
105 | } else { | |
106 | while (*cp != ' ' && *cp) | |
107 | ++cp; | |
108 | while (*cp == ' ') | |
109 | ++cp; | |
110 | } | |
111 | } | |
112 | ||
113 | if (limit < mem_limit) | |
114 | mem_limit = limit; | |
115 | } | |
116 | ||
117 | #define MAX_GAP (0x40000000UL >> PAGE_SHIFT) | |
118 | ||
119 | static void __init setup_bootmem(void) | |
120 | { | |
121 | unsigned long bootmap_size; | |
122 | unsigned long mem_max; | |
123 | unsigned long bootmap_pages; | |
124 | unsigned long bootmap_start_pfn; | |
125 | unsigned long bootmap_pfn; | |
126 | #ifndef CONFIG_DISCONTIGMEM | |
127 | physmem_range_t pmem_holes[MAX_PHYSMEM_RANGES - 1]; | |
128 | int npmem_holes; | |
129 | #endif | |
130 | int i, sysram_resource_count; | |
131 | ||
132 | disable_sr_hashing(); /* Turn off space register hashing */ | |
133 | ||
134 | /* | |
135 | * Sort the ranges. Since the number of ranges is typically | |
136 | * small, and performance is not an issue here, just do | |
137 | * a simple insertion sort. | |
138 | */ | |
139 | ||
140 | for (i = 1; i < npmem_ranges; i++) { | |
141 | int j; | |
142 | ||
143 | for (j = i; j > 0; j--) { | |
144 | unsigned long tmp; | |
145 | ||
146 | if (pmem_ranges[j-1].start_pfn < | |
147 | pmem_ranges[j].start_pfn) { | |
148 | ||
149 | break; | |
150 | } | |
151 | tmp = pmem_ranges[j-1].start_pfn; | |
152 | pmem_ranges[j-1].start_pfn = pmem_ranges[j].start_pfn; | |
153 | pmem_ranges[j].start_pfn = tmp; | |
154 | tmp = pmem_ranges[j-1].pages; | |
155 | pmem_ranges[j-1].pages = pmem_ranges[j].pages; | |
156 | pmem_ranges[j].pages = tmp; | |
157 | } | |
158 | } | |
159 | ||
160 | #ifndef CONFIG_DISCONTIGMEM | |
161 | /* | |
162 | * Throw out ranges that are too far apart (controlled by | |
163 | * MAX_GAP). | |
164 | */ | |
165 | ||
166 | for (i = 1; i < npmem_ranges; i++) { | |
167 | if (pmem_ranges[i].start_pfn - | |
168 | (pmem_ranges[i-1].start_pfn + | |
169 | pmem_ranges[i-1].pages) > MAX_GAP) { | |
170 | npmem_ranges = i; | |
171 | printk("Large gap in memory detected (%ld pages). " | |
172 | "Consider turning on CONFIG_DISCONTIGMEM\n", | |
173 | pmem_ranges[i].start_pfn - | |
174 | (pmem_ranges[i-1].start_pfn + | |
175 | pmem_ranges[i-1].pages)); | |
176 | break; | |
177 | } | |
178 | } | |
179 | #endif | |
180 | ||
181 | if (npmem_ranges > 1) { | |
182 | ||
183 | /* Print the memory ranges */ | |
184 | ||
185 | printk(KERN_INFO "Memory Ranges:\n"); | |
186 | ||
187 | for (i = 0; i < npmem_ranges; i++) { | |
188 | unsigned long start; | |
189 | unsigned long size; | |
190 | ||
191 | size = (pmem_ranges[i].pages << PAGE_SHIFT); | |
192 | start = (pmem_ranges[i].start_pfn << PAGE_SHIFT); | |
193 | printk(KERN_INFO "%2d) Start 0x%016lx End 0x%016lx Size %6ld MB\n", | |
194 | i,start, start + (size - 1), size >> 20); | |
195 | } | |
196 | } | |
197 | ||
198 | sysram_resource_count = npmem_ranges; | |
199 | for (i = 0; i < sysram_resource_count; i++) { | |
200 | struct resource *res = &sysram_resources[i]; | |
201 | res->name = "System RAM"; | |
202 | res->start = pmem_ranges[i].start_pfn << PAGE_SHIFT; | |
203 | res->end = res->start + (pmem_ranges[i].pages << PAGE_SHIFT)-1; | |
204 | res->flags = IORESOURCE_MEM | IORESOURCE_BUSY; | |
205 | request_resource(&iomem_resource, res); | |
206 | } | |
207 | ||
208 | /* | |
209 | * For 32 bit kernels we limit the amount of memory we can | |
210 | * support, in order to preserve enough kernel address space | |
211 | * for other purposes. For 64 bit kernels we don't normally | |
212 | * limit the memory, but this mechanism can be used to | |
213 | * artificially limit the amount of memory (and it is written | |
214 | * to work with multiple memory ranges). | |
215 | */ | |
216 | ||
217 | mem_limit_func(); /* check for "mem=" argument */ | |
218 | ||
219 | mem_max = 0; | |
1da177e4 LT |
220 | for (i = 0; i < npmem_ranges; i++) { |
221 | unsigned long rsize; | |
222 | ||
223 | rsize = pmem_ranges[i].pages << PAGE_SHIFT; | |
224 | if ((mem_max + rsize) > mem_limit) { | |
225 | printk(KERN_WARNING "Memory truncated to %ld MB\n", mem_limit >> 20); | |
226 | if (mem_max == mem_limit) | |
227 | npmem_ranges = i; | |
228 | else { | |
229 | pmem_ranges[i].pages = (mem_limit >> PAGE_SHIFT) | |
230 | - (mem_max >> PAGE_SHIFT); | |
231 | npmem_ranges = i + 1; | |
232 | mem_max = mem_limit; | |
233 | } | |
1da177e4 LT |
234 | break; |
235 | } | |
1da177e4 LT |
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); | |
161bd3bf HD |
330 | reserve_bootmem_node(NODE_DATA(0), __pa(KERNEL_BINARY_TEXT_START), |
331 | (unsigned long)(_end - KERNEL_BINARY_TEXT_START), | |
332 | BOOTMEM_DEFAULT); | |
1da177e4 | 333 | reserve_bootmem_node(NODE_DATA(0), (bootmap_start_pfn << PAGE_SHIFT), |
72a7fe39 BW |
334 | ((bootmap_pfn - bootmap_start_pfn) << PAGE_SHIFT), |
335 | BOOTMEM_DEFAULT); | |
1da177e4 LT |
336 | |
337 | #ifndef CONFIG_DISCONTIGMEM | |
338 | ||
339 | /* reserve the holes */ | |
340 | ||
341 | for (i = 0; i < npmem_holes; i++) { | |
342 | reserve_bootmem_node(NODE_DATA(0), | |
343 | (pmem_holes[i].start_pfn << PAGE_SHIFT), | |
72a7fe39 BW |
344 | (pmem_holes[i].pages << PAGE_SHIFT), |
345 | BOOTMEM_DEFAULT); | |
1da177e4 LT |
346 | } |
347 | #endif | |
348 | ||
349 | #ifdef CONFIG_BLK_DEV_INITRD | |
350 | if (initrd_start) { | |
351 | printk(KERN_INFO "initrd: %08lx-%08lx\n", initrd_start, initrd_end); | |
352 | if (__pa(initrd_start) < mem_max) { | |
353 | unsigned long initrd_reserve; | |
354 | ||
355 | if (__pa(initrd_end) > mem_max) { | |
356 | initrd_reserve = mem_max - __pa(initrd_start); | |
357 | } else { | |
358 | initrd_reserve = initrd_end - initrd_start; | |
359 | } | |
360 | initrd_below_start_ok = 1; | |
361 | printk(KERN_INFO "initrd: reserving %08lx-%08lx (mem_max %08lx)\n", __pa(initrd_start), __pa(initrd_start) + initrd_reserve, mem_max); | |
362 | ||
72a7fe39 BW |
363 | reserve_bootmem_node(NODE_DATA(0), __pa(initrd_start), |
364 | initrd_reserve, BOOTMEM_DEFAULT); | |
1da177e4 LT |
365 | } |
366 | } | |
367 | #endif | |
368 | ||
369 | data_resource.start = virt_to_phys(&data_start); | |
c51d476a KM |
370 | data_resource.end = virt_to_phys(_end) - 1; |
371 | code_resource.start = virt_to_phys(_text); | |
1da177e4 LT |
372 | code_resource.end = virt_to_phys(&data_start)-1; |
373 | ||
374 | /* We don't know which region the kernel will be in, so try | |
375 | * all of them. | |
376 | */ | |
377 | for (i = 0; i < sysram_resource_count; i++) { | |
378 | struct resource *res = &sysram_resources[i]; | |
379 | request_resource(res, &code_resource); | |
380 | request_resource(res, &data_resource); | |
381 | } | |
382 | request_resource(&sysram_resources[0], &pdcdata_resource); | |
383 | } | |
384 | ||
161bd3bf HD |
385 | static int __init parisc_text_address(unsigned long vaddr) |
386 | { | |
387 | static unsigned long head_ptr __initdata; | |
388 | ||
389 | if (!head_ptr) | |
390 | head_ptr = PAGE_MASK & (unsigned long) | |
391 | dereference_function_descriptor(&parisc_kernel_start); | |
392 | ||
393 | return core_kernel_text(vaddr) || vaddr == head_ptr; | |
394 | } | |
395 | ||
d7dd2ff1 JB |
396 | static void __init map_pages(unsigned long start_vaddr, |
397 | unsigned long start_paddr, unsigned long size, | |
398 | pgprot_t pgprot, int force) | |
399 | { | |
400 | pgd_t *pg_dir; | |
401 | pmd_t *pmd; | |
402 | pte_t *pg_table; | |
403 | unsigned long end_paddr; | |
404 | unsigned long start_pmd; | |
405 | unsigned long start_pte; | |
406 | unsigned long tmp1; | |
407 | unsigned long tmp2; | |
408 | unsigned long address; | |
409 | unsigned long vaddr; | |
410 | unsigned long ro_start; | |
411 | unsigned long ro_end; | |
412 | unsigned long fv_addr; | |
413 | unsigned long gw_addr; | |
414 | extern const unsigned long fault_vector_20; | |
415 | extern void * const linux_gateway_page; | |
416 | ||
417 | ro_start = __pa((unsigned long)_text); | |
418 | ro_end = __pa((unsigned long)&data_start); | |
419 | fv_addr = __pa((unsigned long)&fault_vector_20) & PAGE_MASK; | |
420 | gw_addr = __pa((unsigned long)&linux_gateway_page) & PAGE_MASK; | |
421 | ||
422 | end_paddr = start_paddr + size; | |
423 | ||
424 | pg_dir = pgd_offset_k(start_vaddr); | |
425 | ||
426 | #if PTRS_PER_PMD == 1 | |
427 | start_pmd = 0; | |
428 | #else | |
429 | start_pmd = ((start_vaddr >> PMD_SHIFT) & (PTRS_PER_PMD - 1)); | |
430 | #endif | |
431 | start_pte = ((start_vaddr >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)); | |
432 | ||
433 | address = start_paddr; | |
434 | vaddr = start_vaddr; | |
435 | while (address < end_paddr) { | |
436 | #if PTRS_PER_PMD == 1 | |
437 | pmd = (pmd_t *)__pa(pg_dir); | |
438 | #else | |
439 | pmd = (pmd_t *)pgd_address(*pg_dir); | |
440 | ||
441 | /* | |
442 | * pmd is physical at this point | |
443 | */ | |
444 | ||
445 | if (!pmd) { | |
446 | pmd = (pmd_t *) alloc_bootmem_low_pages_node(NODE_DATA(0), PAGE_SIZE << PMD_ORDER); | |
447 | pmd = (pmd_t *) __pa(pmd); | |
448 | } | |
449 | ||
450 | pgd_populate(NULL, pg_dir, __va(pmd)); | |
451 | #endif | |
452 | pg_dir++; | |
453 | ||
454 | /* now change pmd to kernel virtual addresses */ | |
455 | ||
456 | pmd = (pmd_t *)__va(pmd) + start_pmd; | |
457 | for (tmp1 = start_pmd; tmp1 < PTRS_PER_PMD; tmp1++, pmd++) { | |
458 | ||
459 | /* | |
460 | * pg_table is physical at this point | |
461 | */ | |
462 | ||
463 | pg_table = (pte_t *)pmd_address(*pmd); | |
464 | if (!pg_table) { | |
465 | pg_table = (pte_t *) | |
466 | alloc_bootmem_low_pages_node(NODE_DATA(0), PAGE_SIZE); | |
467 | pg_table = (pte_t *) __pa(pg_table); | |
468 | } | |
469 | ||
470 | pmd_populate_kernel(NULL, pmd, __va(pg_table)); | |
471 | ||
472 | /* now change pg_table to kernel virtual addresses */ | |
473 | ||
474 | pg_table = (pte_t *) __va(pg_table) + start_pte; | |
475 | for (tmp2 = start_pte; tmp2 < PTRS_PER_PTE; tmp2++, pg_table++) { | |
476 | pte_t pte; | |
477 | ||
478 | /* | |
479 | * Map the fault vector writable so we can | |
480 | * write the HPMC checksum. | |
481 | */ | |
482 | if (force) | |
483 | pte = __mk_pte(address, pgprot); | |
161bd3bf | 484 | else if (parisc_text_address(vaddr) && |
d7dd2ff1 JB |
485 | address != fv_addr) |
486 | pte = __mk_pte(address, PAGE_KERNEL_EXEC); | |
487 | else | |
488 | #if defined(CONFIG_PARISC_PAGE_SIZE_4KB) | |
489 | if (address >= ro_start && address < ro_end | |
490 | && address != fv_addr | |
491 | && address != gw_addr) | |
492 | pte = __mk_pte(address, PAGE_KERNEL_RO); | |
493 | else | |
494 | #endif | |
495 | pte = __mk_pte(address, pgprot); | |
496 | ||
497 | if (address >= end_paddr) { | |
498 | if (force) | |
499 | break; | |
500 | else | |
501 | pte_val(pte) = 0; | |
502 | } | |
503 | ||
504 | set_pte(pg_table, pte); | |
505 | ||
506 | address += PAGE_SIZE; | |
507 | vaddr += PAGE_SIZE; | |
508 | } | |
509 | start_pte = 0; | |
510 | ||
511 | if (address >= end_paddr) | |
512 | break; | |
513 | } | |
514 | start_pmd = 0; | |
515 | } | |
516 | } | |
517 | ||
1da177e4 LT |
518 | void free_initmem(void) |
519 | { | |
4fb11781 KM |
520 | unsigned long init_begin = (unsigned long)__init_begin; |
521 | unsigned long init_end = (unsigned long)__init_end; | |
1da177e4 | 522 | |
d7dd2ff1 JB |
523 | /* The init text pages are marked R-X. We have to |
524 | * flush the icache and mark them RW- | |
525 | * | |
526 | * This is tricky, because map_pages is in the init section. | |
527 | * Do a dummy remap of the data section first (the data | |
528 | * section is already PAGE_KERNEL) to pull in the TLB entries | |
529 | * for map_kernel */ | |
530 | map_pages(init_begin, __pa(init_begin), init_end - init_begin, | |
531 | PAGE_KERNEL_RWX, 1); | |
532 | /* now remap at PAGE_KERNEL since the TLB is pre-primed to execute | |
533 | * map_pages */ | |
534 | map_pages(init_begin, __pa(init_begin), init_end - init_begin, | |
535 | PAGE_KERNEL, 1); | |
536 | ||
537 | /* force the kernel to see the new TLB entries */ | |
538 | __flush_tlb_range(0, init_begin, init_end); | |
1da177e4 LT |
539 | /* Attempt to catch anyone trying to execute code here |
540 | * by filling the page with BRK insns. | |
1da177e4 | 541 | */ |
20dbc9f7 | 542 | memset((void *)init_begin, 0x00, init_end - init_begin); |
d7dd2ff1 JB |
543 | /* finally dump all the instructions which were cached, since the |
544 | * pages are no-longer executable */ | |
4fb11781 | 545 | flush_icache_range(init_begin, init_end); |
1da177e4 | 546 | |
7d2c7747 | 547 | free_initmem_default(-1); |
1da177e4 LT |
548 | |
549 | /* set up a new led state on systems shipped LED State panel */ | |
550 | pdc_chassis_send_status(PDC_CHASSIS_DIRECT_BCOMPLETE); | |
1da177e4 LT |
551 | } |
552 | ||
1bcdd854 HD |
553 | |
554 | #ifdef CONFIG_DEBUG_RODATA | |
555 | void mark_rodata_ro(void) | |
556 | { | |
1bcdd854 HD |
557 | /* rodata memory was already mapped with KERNEL_RO access rights by |
558 | pagetable_init() and map_pages(). No need to do additional stuff here */ | |
559 | printk (KERN_INFO "Write protecting the kernel read-only data: %luk\n", | |
a581c2a4 | 560 | (unsigned long)(__end_rodata - __start_rodata) >> 10); |
1bcdd854 HD |
561 | } |
562 | #endif | |
563 | ||
564 | ||
1da177e4 LT |
565 | /* |
566 | * Just an arbitrary offset to serve as a "hole" between mapping areas | |
567 | * (between top of physical memory and a potential pcxl dma mapping | |
568 | * area, and below the vmalloc mapping area). | |
569 | * | |
570 | * The current 32K value just means that there will be a 32K "hole" | |
571 | * between mapping areas. That means that any out-of-bounds memory | |
572 | * accesses will hopefully be caught. The vmalloc() routines leaves | |
573 | * a hole of 4kB between each vmalloced area for the same reason. | |
574 | */ | |
575 | ||
576 | /* Leave room for gateway page expansion */ | |
577 | #if KERNEL_MAP_START < GATEWAY_PAGE_SIZE | |
578 | #error KERNEL_MAP_START is in gateway reserved region | |
579 | #endif | |
580 | #define MAP_START (KERNEL_MAP_START) | |
581 | ||
582 | #define VM_MAP_OFFSET (32*1024) | |
583 | #define SET_MAP_OFFSET(x) ((void *)(((unsigned long)(x) + VM_MAP_OFFSET) \ | |
584 | & ~(VM_MAP_OFFSET-1))) | |
585 | ||
4255f0d2 HD |
586 | void *parisc_vmalloc_start __read_mostly; |
587 | EXPORT_SYMBOL(parisc_vmalloc_start); | |
1da177e4 LT |
588 | |
589 | #ifdef CONFIG_PA11 | |
8039de10 | 590 | unsigned long pcxl_dma_start __read_mostly; |
1da177e4 LT |
591 | #endif |
592 | ||
593 | void __init mem_init(void) | |
594 | { | |
d0cf62fb HD |
595 | /* Do sanity checks on IPC (compat) structures */ |
596 | BUILD_BUG_ON(sizeof(struct ipc64_perm) != 48); | |
597 | #ifndef CONFIG_64BIT | |
598 | BUILD_BUG_ON(sizeof(struct semid64_ds) != 80); | |
599 | BUILD_BUG_ON(sizeof(struct msqid64_ds) != 104); | |
600 | BUILD_BUG_ON(sizeof(struct shmid64_ds) != 104); | |
601 | #endif | |
602 | #ifdef CONFIG_COMPAT | |
603 | BUILD_BUG_ON(sizeof(struct compat_ipc64_perm) != sizeof(struct ipc64_perm)); | |
604 | BUILD_BUG_ON(sizeof(struct compat_semid64_ds) != 80); | |
605 | BUILD_BUG_ON(sizeof(struct compat_msqid64_ds) != 104); | |
606 | BUILD_BUG_ON(sizeof(struct compat_shmid64_ds) != 104); | |
607 | #endif | |
608 | ||
48d27cb2 HD |
609 | /* Do sanity checks on page table constants */ |
610 | BUILD_BUG_ON(PTE_ENTRY_SIZE != sizeof(pte_t)); | |
611 | BUILD_BUG_ON(PMD_ENTRY_SIZE != sizeof(pmd_t)); | |
612 | BUILD_BUG_ON(PGD_ENTRY_SIZE != sizeof(pgd_t)); | |
613 | BUILD_BUG_ON(PAGE_SHIFT + BITS_PER_PTE + BITS_PER_PMD + BITS_PER_PGD | |
614 | > BITS_PER_LONG); | |
615 | ||
1da177e4 | 616 | high_memory = __va((max_pfn << PAGE_SHIFT)); |
d5c017dd | 617 | set_max_mapnr(page_to_pfn(virt_to_page(high_memory - 1)) + 1); |
0c988534 | 618 | free_all_bootmem(); |
1da177e4 | 619 | |
1da177e4 LT |
620 | #ifdef CONFIG_PA11 |
621 | if (hppa_dma_ops == &pcxl_dma_ops) { | |
622 | pcxl_dma_start = (unsigned long)SET_MAP_OFFSET(MAP_START); | |
4255f0d2 HD |
623 | parisc_vmalloc_start = SET_MAP_OFFSET(pcxl_dma_start |
624 | + PCXL_DMA_MAP_SIZE); | |
1da177e4 LT |
625 | } else { |
626 | pcxl_dma_start = 0; | |
4255f0d2 | 627 | parisc_vmalloc_start = SET_MAP_OFFSET(MAP_START); |
1da177e4 LT |
628 | } |
629 | #else | |
4255f0d2 | 630 | parisc_vmalloc_start = SET_MAP_OFFSET(MAP_START); |
1da177e4 LT |
631 | #endif |
632 | ||
7d2c7747 | 633 | mem_init_print_info(NULL); |
ce8420bb HD |
634 | #ifdef CONFIG_DEBUG_KERNEL /* double-sanity-check paranoia */ |
635 | printk("virtual kernel memory layout:\n" | |
636 | " vmalloc : 0x%p - 0x%p (%4ld MB)\n" | |
53faf291 | 637 | " memory : 0x%p - 0x%p (%4ld MB)\n" |
ce8420bb HD |
638 | " .init : 0x%p - 0x%p (%4ld kB)\n" |
639 | " .data : 0x%p - 0x%p (%4ld kB)\n" | |
640 | " .text : 0x%p - 0x%p (%4ld kB)\n", | |
641 | ||
642 | (void*)VMALLOC_START, (void*)VMALLOC_END, | |
643 | (VMALLOC_END - VMALLOC_START) >> 20, | |
644 | ||
645 | __va(0), high_memory, | |
646 | ((unsigned long)high_memory - (unsigned long)__va(0)) >> 20, | |
647 | ||
53faf291 KM |
648 | __init_begin, __init_end, |
649 | ((unsigned long)__init_end - (unsigned long)__init_begin) >> 10, | |
ce8420bb | 650 | |
53faf291 KM |
651 | _etext, _edata, |
652 | ((unsigned long)_edata - (unsigned long)_etext) >> 10, | |
ce8420bb | 653 | |
53faf291 KM |
654 | _text, _etext, |
655 | ((unsigned long)_etext - (unsigned long)_text) >> 10); | |
ce8420bb | 656 | #endif |
1da177e4 LT |
657 | } |
658 | ||
8039de10 | 659 | unsigned long *empty_zero_page __read_mostly; |
22febf1f | 660 | EXPORT_SYMBOL(empty_zero_page); |
1da177e4 | 661 | |
b2b755b5 | 662 | void show_mem(unsigned int filter) |
1da177e4 | 663 | { |
aec6a888 MG |
664 | int total = 0,reserved = 0; |
665 | pg_data_t *pgdat; | |
1da177e4 LT |
666 | |
667 | printk(KERN_INFO "Mem-info:\n"); | |
7bf02ea2 | 668 | show_free_areas(filter); |
1da177e4 | 669 | |
aec6a888 MG |
670 | for_each_online_pgdat(pgdat) { |
671 | unsigned long flags; | |
672 | int zoneid; | |
673 | ||
674 | pgdat_resize_lock(pgdat, &flags); | |
675 | for (zoneid = 0; zoneid < MAX_NR_ZONES; zoneid++) { | |
676 | struct zone *zone = &pgdat->node_zones[zoneid]; | |
677 | if (!populated_zone(zone)) | |
678 | continue; | |
679 | ||
680 | total += zone->present_pages; | |
681 | reserved = zone->present_pages - zone->managed_pages; | |
682 | } | |
683 | pgdat_resize_unlock(pgdat, &flags); | |
1da177e4 | 684 | } |
aec6a888 | 685 | |
1da177e4 LT |
686 | printk(KERN_INFO "%d pages of RAM\n", total); |
687 | printk(KERN_INFO "%d reserved pages\n", reserved); | |
1da177e4 LT |
688 | |
689 | #ifdef CONFIG_DISCONTIGMEM | |
690 | { | |
691 | struct zonelist *zl; | |
54a6eb5c | 692 | int i, j; |
1da177e4 LT |
693 | |
694 | for (i = 0; i < npmem_ranges; i++) { | |
4413a0f6 | 695 | zl = node_zonelist(i, 0); |
1da177e4 | 696 | for (j = 0; j < MAX_NR_ZONES; j++) { |
dd1a239f | 697 | struct zoneref *z; |
54a6eb5c | 698 | struct zone *zone; |
1da177e4 LT |
699 | |
700 | printk("Zone list for zone %d on node %d: ", j, i); | |
54a6eb5c MG |
701 | for_each_zone_zonelist(zone, z, zl, j) |
702 | printk("[%d/%s] ", zone_to_nid(zone), | |
703 | zone->name); | |
1da177e4 LT |
704 | printk("\n"); |
705 | } | |
706 | } | |
707 | } | |
708 | #endif | |
709 | } | |
710 | ||
1da177e4 LT |
711 | /* |
712 | * pagetable_init() sets up the page tables | |
713 | * | |
714 | * Note that gateway_init() places the Linux gateway page at page 0. | |
715 | * Since gateway pages cannot be dereferenced this has the desirable | |
716 | * side effect of trapping those pesky NULL-reference errors in the | |
717 | * kernel. | |
718 | */ | |
719 | static void __init pagetable_init(void) | |
720 | { | |
721 | int range; | |
722 | ||
723 | /* Map each physical memory range to its kernel vaddr */ | |
724 | ||
725 | for (range = 0; range < npmem_ranges; range++) { | |
726 | unsigned long start_paddr; | |
727 | unsigned long end_paddr; | |
728 | unsigned long size; | |
729 | ||
730 | start_paddr = pmem_ranges[range].start_pfn << PAGE_SHIFT; | |
731 | end_paddr = start_paddr + (pmem_ranges[range].pages << PAGE_SHIFT); | |
732 | size = pmem_ranges[range].pages << PAGE_SHIFT; | |
733 | ||
734 | map_pages((unsigned long)__va(start_paddr), start_paddr, | |
d7dd2ff1 | 735 | size, PAGE_KERNEL, 0); |
1da177e4 LT |
736 | } |
737 | ||
738 | #ifdef CONFIG_BLK_DEV_INITRD | |
739 | if (initrd_end && initrd_end > mem_limit) { | |
1bcdd854 | 740 | printk(KERN_INFO "initrd: mapping %08lx-%08lx\n", initrd_start, initrd_end); |
1da177e4 | 741 | map_pages(initrd_start, __pa(initrd_start), |
d7dd2ff1 | 742 | initrd_end - initrd_start, PAGE_KERNEL, 0); |
1da177e4 LT |
743 | } |
744 | #endif | |
745 | ||
746 | empty_zero_page = alloc_bootmem_pages(PAGE_SIZE); | |
1da177e4 LT |
747 | } |
748 | ||
749 | static void __init gateway_init(void) | |
750 | { | |
751 | unsigned long linux_gateway_page_addr; | |
752 | /* FIXME: This is 'const' in order to trick the compiler | |
753 | into not treating it as DP-relative data. */ | |
754 | extern void * const linux_gateway_page; | |
755 | ||
756 | linux_gateway_page_addr = LINUX_GATEWAY_ADDR & PAGE_MASK; | |
757 | ||
758 | /* | |
759 | * Setup Linux Gateway page. | |
760 | * | |
761 | * The Linux gateway page will reside in kernel space (on virtual | |
762 | * page 0), so it doesn't need to be aliased into user space. | |
763 | */ | |
764 | ||
765 | map_pages(linux_gateway_page_addr, __pa(&linux_gateway_page), | |
d7dd2ff1 | 766 | PAGE_SIZE, PAGE_GATEWAY, 1); |
1da177e4 LT |
767 | } |
768 | ||
1da177e4 LT |
769 | void __init paging_init(void) |
770 | { | |
771 | int i; | |
772 | ||
773 | setup_bootmem(); | |
774 | pagetable_init(); | |
775 | gateway_init(); | |
776 | flush_cache_all_local(); /* start with known state */ | |
ce33941f | 777 | flush_tlb_all_local(NULL); |
1da177e4 LT |
778 | |
779 | for (i = 0; i < npmem_ranges; i++) { | |
f06a9684 | 780 | unsigned long zones_size[MAX_NR_ZONES] = { 0, }; |
1da177e4 | 781 | |
00592837 | 782 | zones_size[ZONE_NORMAL] = pmem_ranges[i].pages; |
1da177e4 LT |
783 | |
784 | #ifdef CONFIG_DISCONTIGMEM | |
785 | /* Need to initialize the pfnnid_map before we can initialize | |
786 | the zone */ | |
787 | { | |
788 | int j; | |
789 | for (j = (pmem_ranges[i].start_pfn >> PFNNID_SHIFT); | |
790 | j <= ((pmem_ranges[i].start_pfn + pmem_ranges[i].pages) >> PFNNID_SHIFT); | |
791 | j++) { | |
792 | pfnnid_map[j] = i; | |
793 | } | |
794 | } | |
795 | #endif | |
796 | ||
9109fb7b | 797 | free_area_init_node(i, zones_size, |
1da177e4 LT |
798 | pmem_ranges[i].start_pfn, NULL); |
799 | } | |
800 | } | |
801 | ||
802 | #ifdef CONFIG_PA20 | |
803 | ||
804 | /* | |
7022672e | 805 | * Currently, all PA20 chips have 18 bit protection IDs, which is the |
1da177e4 LT |
806 | * limiting factor (space ids are 32 bits). |
807 | */ | |
808 | ||
809 | #define NR_SPACE_IDS 262144 | |
810 | ||
811 | #else | |
812 | ||
813 | /* | |
7022672e SA |
814 | * Currently we have a one-to-one relationship between space IDs and |
815 | * protection IDs. Older parisc chips (PCXS, PCXT, PCXL, PCXL2) only | |
816 | * support 15 bit protection IDs, so that is the limiting factor. | |
817 | * PCXT' has 18 bit protection IDs, but only 16 bit spaceids, so it's | |
1da177e4 LT |
818 | * probably not worth the effort for a special case here. |
819 | */ | |
820 | ||
821 | #define NR_SPACE_IDS 32768 | |
822 | ||
823 | #endif /* !CONFIG_PA20 */ | |
824 | ||
825 | #define RECYCLE_THRESHOLD (NR_SPACE_IDS / 2) | |
826 | #define SID_ARRAY_SIZE (NR_SPACE_IDS / (8 * sizeof(long))) | |
827 | ||
828 | static unsigned long space_id[SID_ARRAY_SIZE] = { 1 }; /* disallow space 0 */ | |
829 | static unsigned long dirty_space_id[SID_ARRAY_SIZE]; | |
830 | static unsigned long space_id_index; | |
831 | static unsigned long free_space_ids = NR_SPACE_IDS - 1; | |
832 | static unsigned long dirty_space_ids = 0; | |
833 | ||
834 | static DEFINE_SPINLOCK(sid_lock); | |
835 | ||
836 | unsigned long alloc_sid(void) | |
837 | { | |
838 | unsigned long index; | |
839 | ||
840 | spin_lock(&sid_lock); | |
841 | ||
842 | if (free_space_ids == 0) { | |
843 | if (dirty_space_ids != 0) { | |
844 | spin_unlock(&sid_lock); | |
845 | flush_tlb_all(); /* flush_tlb_all() calls recycle_sids() */ | |
846 | spin_lock(&sid_lock); | |
847 | } | |
2fd83038 | 848 | BUG_ON(free_space_ids == 0); |
1da177e4 LT |
849 | } |
850 | ||
851 | free_space_ids--; | |
852 | ||
853 | index = find_next_zero_bit(space_id, NR_SPACE_IDS, space_id_index); | |
854 | space_id[index >> SHIFT_PER_LONG] |= (1L << (index & (BITS_PER_LONG - 1))); | |
855 | space_id_index = index; | |
856 | ||
857 | spin_unlock(&sid_lock); | |
858 | ||
859 | return index << SPACEID_SHIFT; | |
860 | } | |
861 | ||
862 | void free_sid(unsigned long spaceid) | |
863 | { | |
864 | unsigned long index = spaceid >> SPACEID_SHIFT; | |
865 | unsigned long *dirty_space_offset; | |
866 | ||
867 | dirty_space_offset = dirty_space_id + (index >> SHIFT_PER_LONG); | |
868 | index &= (BITS_PER_LONG - 1); | |
869 | ||
870 | spin_lock(&sid_lock); | |
871 | ||
2fd83038 | 872 | BUG_ON(*dirty_space_offset & (1L << index)); /* attempt to free space id twice */ |
1da177e4 LT |
873 | |
874 | *dirty_space_offset |= (1L << index); | |
875 | dirty_space_ids++; | |
876 | ||
877 | spin_unlock(&sid_lock); | |
878 | } | |
879 | ||
880 | ||
881 | #ifdef CONFIG_SMP | |
882 | static void get_dirty_sids(unsigned long *ndirtyptr,unsigned long *dirty_array) | |
883 | { | |
884 | int i; | |
885 | ||
886 | /* NOTE: sid_lock must be held upon entry */ | |
887 | ||
888 | *ndirtyptr = dirty_space_ids; | |
889 | if (dirty_space_ids != 0) { | |
890 | for (i = 0; i < SID_ARRAY_SIZE; i++) { | |
891 | dirty_array[i] = dirty_space_id[i]; | |
892 | dirty_space_id[i] = 0; | |
893 | } | |
894 | dirty_space_ids = 0; | |
895 | } | |
896 | ||
897 | return; | |
898 | } | |
899 | ||
900 | static void recycle_sids(unsigned long ndirty,unsigned long *dirty_array) | |
901 | { | |
902 | int i; | |
903 | ||
904 | /* NOTE: sid_lock must be held upon entry */ | |
905 | ||
906 | if (ndirty != 0) { | |
907 | for (i = 0; i < SID_ARRAY_SIZE; i++) { | |
908 | space_id[i] ^= dirty_array[i]; | |
909 | } | |
910 | ||
911 | free_space_ids += ndirty; | |
912 | space_id_index = 0; | |
913 | } | |
914 | } | |
915 | ||
916 | #else /* CONFIG_SMP */ | |
917 | ||
918 | static void recycle_sids(void) | |
919 | { | |
920 | int i; | |
921 | ||
922 | /* NOTE: sid_lock must be held upon entry */ | |
923 | ||
924 | if (dirty_space_ids != 0) { | |
925 | for (i = 0; i < SID_ARRAY_SIZE; i++) { | |
926 | space_id[i] ^= dirty_space_id[i]; | |
927 | dirty_space_id[i] = 0; | |
928 | } | |
929 | ||
930 | free_space_ids += dirty_space_ids; | |
931 | dirty_space_ids = 0; | |
932 | space_id_index = 0; | |
933 | } | |
934 | } | |
935 | #endif | |
936 | ||
937 | /* | |
938 | * flush_tlb_all() calls recycle_sids(), since whenever the entire tlb is | |
939 | * purged, we can safely reuse the space ids that were released but | |
940 | * not flushed from the tlb. | |
941 | */ | |
942 | ||
943 | #ifdef CONFIG_SMP | |
944 | ||
945 | static unsigned long recycle_ndirty; | |
946 | static unsigned long recycle_dirty_array[SID_ARRAY_SIZE]; | |
2fd83038 | 947 | static unsigned int recycle_inuse; |
1da177e4 LT |
948 | |
949 | void flush_tlb_all(void) | |
950 | { | |
951 | int do_recycle; | |
952 | ||
416821d3 | 953 | __inc_irq_stat(irq_tlb_count); |
1da177e4 LT |
954 | do_recycle = 0; |
955 | spin_lock(&sid_lock); | |
956 | if (dirty_space_ids > RECYCLE_THRESHOLD) { | |
2fd83038 | 957 | BUG_ON(recycle_inuse); /* FIXME: Use a semaphore/wait queue here */ |
1da177e4 LT |
958 | get_dirty_sids(&recycle_ndirty,recycle_dirty_array); |
959 | recycle_inuse++; | |
960 | do_recycle++; | |
961 | } | |
962 | spin_unlock(&sid_lock); | |
15c8b6c1 | 963 | on_each_cpu(flush_tlb_all_local, NULL, 1); |
1da177e4 LT |
964 | if (do_recycle) { |
965 | spin_lock(&sid_lock); | |
966 | recycle_sids(recycle_ndirty,recycle_dirty_array); | |
967 | recycle_inuse = 0; | |
968 | spin_unlock(&sid_lock); | |
969 | } | |
970 | } | |
971 | #else | |
972 | void flush_tlb_all(void) | |
973 | { | |
416821d3 | 974 | __inc_irq_stat(irq_tlb_count); |
1da177e4 | 975 | spin_lock(&sid_lock); |
1b2425e3 | 976 | flush_tlb_all_local(NULL); |
1da177e4 LT |
977 | recycle_sids(); |
978 | spin_unlock(&sid_lock); | |
979 | } | |
980 | #endif | |
981 | ||
982 | #ifdef CONFIG_BLK_DEV_INITRD | |
983 | void free_initrd_mem(unsigned long start, unsigned long end) | |
984 | { | |
7d2c7747 | 985 | free_reserved_area((void *)start, (void *)end, -1, "initrd"); |
1da177e4 LT |
986 | } |
987 | #endif |