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[PATCH] Dynamic kernel command-line: mips
[linux-2.6-block.git] / arch / parisc / mm / init.c
CommitLineData
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>
a581c2a4 30#include <asm/sections.h>
1da177e4
LT		 31
32DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
33
1da177e4 34extern int data_start;
1da177e4
LT		 35
36#ifdef CONFIG_DISCONTIGMEM
8039de10
HD		 37struct node_map_data node_data[MAX_NUMNODES] __read_mostly;
38bootmem_data_t bmem_data[MAX_NUMNODES] __read_mostly;
39unsigned char pfnnid_map[PFNNID_MAP_MAX] __read_mostly;
1da177e4
LT		 40#endif
41
42static struct resource data_resource = {
43 .name = "Kernel data",
44 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
45};
46
47static struct resource code_resource = {
48 .name = "Kernel code",
49 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
50};
51
52static struct resource pdcdata_resource = {
53 .name = "PDC data (Page Zero)",
54 .start = 0,
55 .end = 0x9ff,
56 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
57};
58
8039de10 59static struct resource sysram_resources[MAX_PHYSMEM_RANGES] __read_mostly;
1da177e4
LT		 60
61/* The following array is initialized from the firmware specific
62 * information retrieved in kernel/inventory.c.
63 */
64
8039de10
HD		 65physmem_range_t pmem_ranges[MAX_PHYSMEM_RANGES] __read_mostly;
66int npmem_ranges __read_mostly;
1da177e4
LT		 67
68#ifdef __LP64__
69#define MAX_MEM (~0UL)
70#else /* !__LP64__ */
71#define MAX_MEM (3584U*1024U*1024U)
72#endif /* !__LP64__ */
73
8039de10 74static unsigned long mem_limit __read_mostly = MAX_MEM;
1da177e4
LT		 75
76static void __init mem_limit_func(void)
77{
78 char *cp, *end;
79 unsigned long limit;
80 extern char saved_command_line[];
81
82 /* We need this before __setup() functions are called */
83
84 limit = MAX_MEM;
85 for (cp = saved_command_line; *cp; ) {
86 if (memcmp(cp, "mem=", 4) == 0) {
87 cp += 4;
88 limit = memparse(cp, &end);
89 if (end != cp)
90 break;
91 cp = end;
92 } else {
93 while (*cp != ' ' && *cp)
94 ++cp;
95 while (*cp == ' ')
96 ++cp;
97 }
98 }
99
100 if (limit < mem_limit)
101 mem_limit = limit;
102}
103
104#define MAX_GAP (0x40000000UL >> PAGE_SHIFT)
105
106static void __init setup_bootmem(void)
107{
108 unsigned long bootmap_size;
109 unsigned long mem_max;
110 unsigned long bootmap_pages;
111 unsigned long bootmap_start_pfn;
112 unsigned long bootmap_pfn;
113#ifndef CONFIG_DISCONTIGMEM
114 physmem_range_t pmem_holes[MAX_PHYSMEM_RANGES - 1];
115 int npmem_holes;
116#endif
117 int i, sysram_resource_count;
118
119 disable_sr_hashing(); /* Turn off space register hashing */
120
121 /*
122 * Sort the ranges. Since the number of ranges is typically
123 * small, and performance is not an issue here, just do
124 * a simple insertion sort.
125 */
126
127 for (i = 1; i < npmem_ranges; i++) {
128 int j;
129
130 for (j = i; j > 0; j--) {
131 unsigned long tmp;
132
133 if (pmem_ranges[j-1].start_pfn <
134 pmem_ranges[j].start_pfn) {
135
136 break;
137 }
138 tmp = pmem_ranges[j-1].start_pfn;
139 pmem_ranges[j-1].start_pfn = pmem_ranges[j].start_pfn;
140 pmem_ranges[j].start_pfn = tmp;
141 tmp = pmem_ranges[j-1].pages;
142 pmem_ranges[j-1].pages = pmem_ranges[j].pages;
143 pmem_ranges[j].pages = tmp;
144 }
145 }
146
147#ifndef CONFIG_DISCONTIGMEM
148 /*
149 * Throw out ranges that are too far apart (controlled by
150 * MAX_GAP).
151 */
152
153 for (i = 1; i < npmem_ranges; i++) {
154 if (pmem_ranges[i].start_pfn -
155 (pmem_ranges[i-1].start_pfn +
156 pmem_ranges[i-1].pages) > MAX_GAP) {
157 npmem_ranges = i;
158 printk("Large gap in memory detected (%ld pages). "
159 "Consider turning on CONFIG_DISCONTIGMEM\n",
160 pmem_ranges[i].start_pfn -
161 (pmem_ranges[i-1].start_pfn +
162 pmem_ranges[i-1].pages));
163 break;
164 }
165 }
166#endif
167
168 if (npmem_ranges > 1) {
169
170 /* Print the memory ranges */
171
172 printk(KERN_INFO "Memory Ranges:\n");
173
174 for (i = 0; i < npmem_ranges; i++) {
175 unsigned long start;
176 unsigned long size;
177
178 size = (pmem_ranges[i].pages << PAGE_SHIFT);
179 start = (pmem_ranges[i].start_pfn << PAGE_SHIFT);
180 printk(KERN_INFO "%2d) Start 0x%016lx End 0x%016lx Size %6ld MB\n",
181 i,start, start + (size - 1), size >> 20);
182 }
183 }
184
185 sysram_resource_count = npmem_ranges;
186 for (i = 0; i < sysram_resource_count; i++) {
187 struct resource *res = &sysram_resources[i];
188 res->name = "System RAM";
189 res->start = pmem_ranges[i].start_pfn << PAGE_SHIFT;
190 res->end = res->start + (pmem_ranges[i].pages << PAGE_SHIFT)-1;
191 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
192 request_resource(&iomem_resource, res);
193 }
194
195 /*
196 * For 32 bit kernels we limit the amount of memory we can
197 * support, in order to preserve enough kernel address space
198 * for other purposes. For 64 bit kernels we don't normally
199 * limit the memory, but this mechanism can be used to
200 * artificially limit the amount of memory (and it is written
201 * to work with multiple memory ranges).
202 */
203
204 mem_limit_func(); /* check for "mem=" argument */
205
206 mem_max = 0;
207 num_physpages = 0;
208 for (i = 0; i < npmem_ranges; i++) {
209 unsigned long rsize;
210
211 rsize = pmem_ranges[i].pages << PAGE_SHIFT;
212 if ((mem_max + rsize) > mem_limit) {
213 printk(KERN_WARNING "Memory truncated to %ld MB\n", mem_limit >> 20);
214 if (mem_max == mem_limit)
215 npmem_ranges = i;
216 else {
217 pmem_ranges[i].pages = (mem_limit >> PAGE_SHIFT)
218 - (mem_max >> PAGE_SHIFT);
219 npmem_ranges = i + 1;
220 mem_max = mem_limit;
221 }
222 num_physpages += pmem_ranges[i].pages;
223 break;
224 }
225 num_physpages += pmem_ranges[i].pages;
226 mem_max += rsize;
227 }
228
229 printk(KERN_INFO "Total Memory: %ld MB\n",mem_max >> 20);
230
231#ifndef CONFIG_DISCONTIGMEM
232 /* Merge the ranges, keeping track of the holes */
233
234 {
235 unsigned long end_pfn;
236 unsigned long hole_pages;
237
238 npmem_holes = 0;
239 end_pfn = pmem_ranges[0].start_pfn + pmem_ranges[0].pages;
240 for (i = 1; i < npmem_ranges; i++) {
241
242 hole_pages = pmem_ranges[i].start_pfn - end_pfn;
243 if (hole_pages) {
244 pmem_holes[npmem_holes].start_pfn = end_pfn;
245 pmem_holes[npmem_holes++].pages = hole_pages;
246 end_pfn += hole_pages;
247 }
248 end_pfn += pmem_ranges[i].pages;
249 }
250
251 pmem_ranges[0].pages = end_pfn - pmem_ranges[0].start_pfn;
252 npmem_ranges = 1;
253 }
254#endif
255
256 bootmap_pages = 0;
257 for (i = 0; i < npmem_ranges; i++)
258 bootmap_pages += bootmem_bootmap_pages(pmem_ranges[i].pages);
259
260 bootmap_start_pfn = PAGE_ALIGN(__pa((unsigned long) &_end)) >> PAGE_SHIFT;
261
262#ifdef CONFIG_DISCONTIGMEM
263 for (i = 0; i < MAX_PHYSMEM_RANGES; i++) {
264 memset(NODE_DATA(i), 0, sizeof(pg_data_t));
265 NODE_DATA(i)->bdata = &bmem_data[i];
266 }
267 memset(pfnnid_map, 0xff, sizeof(pfnnid_map));
268
269 for (i = 0; i < npmem_ranges; i++)
270 node_set_online(i);
271#endif
272
273 /*
274 * Initialize and free the full range of memory in each range.
275 * Note that the only writing these routines do are to the bootmap,
276 * and we've made sure to locate the bootmap properly so that they
277 * won't be writing over anything important.
278 */
279
280 bootmap_pfn = bootmap_start_pfn;
281 max_pfn = 0;
282 for (i = 0; i < npmem_ranges; i++) {
283 unsigned long start_pfn;
284 unsigned long npages;
285
286 start_pfn = pmem_ranges[i].start_pfn;
287 npages = pmem_ranges[i].pages;
288
289 bootmap_size = init_bootmem_node(NODE_DATA(i),
290 bootmap_pfn,
291 start_pfn,
292 (start_pfn + npages) );
293 free_bootmem_node(NODE_DATA(i),
294 (start_pfn << PAGE_SHIFT),
295 (npages << PAGE_SHIFT) );
296 bootmap_pfn += (bootmap_size + PAGE_SIZE - 1) >> PAGE_SHIFT;
297 if ((start_pfn + npages) > max_pfn)
298 max_pfn = start_pfn + npages;
299 }
300
5cdb8205
GG		 301 /* IOMMU is always used to access "high mem" on those boxes
302 * that can support enough mem that a PCI device couldn't
303 * directly DMA to any physical addresses.
304 * ISA DMA support will need to revisit this.
305 */
306 max_low_pfn = max_pfn;
307
1da177e4
LT		 308 if ((bootmap_pfn - bootmap_start_pfn) != bootmap_pages) {
309 printk(KERN_WARNING "WARNING! bootmap sizing is messed up!\n");
310 BUG();
311 }
312
313 /* reserve PAGE0 pdc memory, kernel text/data/bss & bootmap */
314
315#define PDC_CONSOLE_IO_IODC_SIZE 32768
316
317 reserve_bootmem_node(NODE_DATA(0), 0UL,
318 (unsigned long)(PAGE0->mem_free + PDC_CONSOLE_IO_IODC_SIZE));
c51d476a
KM		 319 reserve_bootmem_node(NODE_DATA(0), __pa((unsigned long)_text),
320 (unsigned long)(_end - _text));
1da177e4
LT		 321 reserve_bootmem_node(NODE_DATA(0), (bootmap_start_pfn << PAGE_SHIFT),
322 ((bootmap_pfn - bootmap_start_pfn) << PAGE_SHIFT));
323
324#ifndef CONFIG_DISCONTIGMEM
325
326 /* reserve the holes */
327
328 for (i = 0; i < npmem_holes; i++) {
329 reserve_bootmem_node(NODE_DATA(0),
330 (pmem_holes[i].start_pfn << PAGE_SHIFT),
331 (pmem_holes[i].pages << PAGE_SHIFT));
332 }
333#endif
334
335#ifdef CONFIG_BLK_DEV_INITRD
336 if (initrd_start) {
337 printk(KERN_INFO "initrd: %08lx-%08lx\n", initrd_start, initrd_end);
338 if (__pa(initrd_start) < mem_max) {
339 unsigned long initrd_reserve;
340
341 if (__pa(initrd_end) > mem_max) {
342 initrd_reserve = mem_max - __pa(initrd_start);
343 } else {
344 initrd_reserve = initrd_end - initrd_start;
345 }
346 initrd_below_start_ok = 1;
347 printk(KERN_INFO "initrd: reserving %08lx-%08lx (mem_max %08lx)\n", __pa(initrd_start), __pa(initrd_start) + initrd_reserve, mem_max);
348
349 reserve_bootmem_node(NODE_DATA(0),__pa(initrd_start), initrd_reserve);
350 }
351 }
352#endif
353
354 data_resource.start = virt_to_phys(&data_start);
c51d476a
KM		 355 data_resource.end = virt_to_phys(_end) - 1;
356 code_resource.start = virt_to_phys(_text);
1da177e4
LT		 357 code_resource.end = virt_to_phys(&data_start)-1;
358
359 /* We don't know which region the kernel will be in, so try
360 * all of them.
361 */
362 for (i = 0; i < sysram_resource_count; i++) {
363 struct resource *res = &sysram_resources[i];
364 request_resource(res, &code_resource);
365 request_resource(res, &data_resource);
366 }
367 request_resource(&sysram_resources[0], &pdcdata_resource);
368}
369
370void free_initmem(void)
371{
2fd83038
HD		 372 unsigned long addr, init_begin, init_end;
373
1da177e4
LT		 374 printk(KERN_INFO "Freeing unused kernel memory: ");
375
81a3de3e 376#ifdef CONFIG_DEBUG_KERNEL
1da177e4
LT		 377 /* Attempt to catch anyone trying to execute code here
378 * by filling the page with BRK insns.
379 *
380 * If we disable interrupts for all CPUs, then IPI stops working.
381 * Kinda breaks the global cache flushing.
382 */
383 local_irq_disable();
384
c51d476a
KM		 385 memset(__init_begin, 0x00,
386 (unsigned long)__init_end - (unsigned long)__init_begin);
1da177e4
LT		 387
388 flush_data_cache();
389 asm volatile("sync" : : );
c51d476a 390 flush_icache_range((unsigned long)__init_begin, (unsigned long)__init_end);
1da177e4
LT		 391 asm volatile("sync" : : );
392
393 local_irq_enable();
394#endif
395
2fd83038
HD		 396 /* align __init_begin and __init_end to page size,
397 ignoring linker script where we might have tried to save RAM */
c51d476a
KM		 398 init_begin = PAGE_ALIGN((unsigned long)(__init_begin));
399 init_end = PAGE_ALIGN((unsigned long)(__init_end));
2fd83038 400 for (addr = init_begin; addr < init_end; addr += PAGE_SIZE) {
1da177e4 401 ClearPageReserved(virt_to_page(addr));
7835e98b 402 init_page_count(virt_to_page(addr));
1da177e4
LT		 403 free_page(addr);
404 num_physpages++;
405 totalram_pages++;
406 }
407
408 /* set up a new led state on systems shipped LED State panel */
409 pdc_chassis_send_status(PDC_CHASSIS_DIRECT_BCOMPLETE);
410
2fd83038 411 printk("%luk freed\n", (init_end - init_begin) >> 10);
1da177e4
LT		 412}
413
1bcdd854
HD		 414
415#ifdef CONFIG_DEBUG_RODATA
416void mark_rodata_ro(void)
417{
1bcdd854
HD		 418 /* rodata memory was already mapped with KERNEL_RO access rights by
419 pagetable_init() and map_pages(). No need to do additional stuff here */
420 printk (KERN_INFO "Write protecting the kernel read-only data: %luk\n",
a581c2a4 421 (unsigned long)(__end_rodata - __start_rodata) >> 10);
1bcdd854
HD		 422}
423#endif
424
425
1da177e4
LT		 426/*
427 * Just an arbitrary offset to serve as a "hole" between mapping areas
428 * (between top of physical memory and a potential pcxl dma mapping
429 * area, and below the vmalloc mapping area).
430 *
431 * The current 32K value just means that there will be a 32K "hole"
432 * between mapping areas. That means that any out-of-bounds memory
433 * accesses will hopefully be caught. The vmalloc() routines leaves
434 * a hole of 4kB between each vmalloced area for the same reason.
435 */
436
437 /* Leave room for gateway page expansion */
438#if KERNEL_MAP_START < GATEWAY_PAGE_SIZE
439#error KERNEL_MAP_START is in gateway reserved region
440#endif
441#define MAP_START (KERNEL_MAP_START)
442
443#define VM_MAP_OFFSET (32*1024)
444#define SET_MAP_OFFSET(x) ((void *)(((unsigned long)(x) + VM_MAP_OFFSET) \
445 & ~(VM_MAP_OFFSET-1)))
446
8039de10 447void *vmalloc_start __read_mostly;
1da177e4
LT		 448EXPORT_SYMBOL(vmalloc_start);
449
450#ifdef CONFIG_PA11
8039de10 451unsigned long pcxl_dma_start __read_mostly;
1da177e4
LT		 452#endif
453
454void __init mem_init(void)
455{
456 high_memory = __va((max_pfn << PAGE_SHIFT));
457
458#ifndef CONFIG_DISCONTIGMEM
459 max_mapnr = page_to_pfn(virt_to_page(high_memory - 1)) + 1;
460 totalram_pages += free_all_bootmem();
461#else
462 {
463 int i;
464
465 for (i = 0; i < npmem_ranges; i++)
466 totalram_pages += free_all_bootmem_node(NODE_DATA(i));
467 }
468#endif
469
470 printk(KERN_INFO "Memory: %luk available\n", num_physpages << (PAGE_SHIFT-10));
471
472#ifdef CONFIG_PA11
473 if (hppa_dma_ops == &pcxl_dma_ops) {
474 pcxl_dma_start = (unsigned long)SET_MAP_OFFSET(MAP_START);
475 vmalloc_start = SET_MAP_OFFSET(pcxl_dma_start + PCXL_DMA_MAP_SIZE);
476 } else {
477 pcxl_dma_start = 0;
478 vmalloc_start = SET_MAP_OFFSET(MAP_START);
479 }
480#else
481 vmalloc_start = SET_MAP_OFFSET(MAP_START);
482#endif
483
484}
485
8039de10 486unsigned long *empty_zero_page __read_mostly;
1da177e4
LT		 487
488void show_mem(void)
489{
490 int i,free = 0,total = 0,reserved = 0;
491 int shared = 0, cached = 0;
492
493 printk(KERN_INFO "Mem-info:\n");
494 show_free_areas();
495 printk(KERN_INFO "Free swap: %6ldkB\n",
496 nr_swap_pages<<(PAGE_SHIFT-10));
497#ifndef CONFIG_DISCONTIGMEM
498 i = max_mapnr;
499 while (i-- > 0) {
500 total++;
501 if (PageReserved(mem_map+i))
502 reserved++;
503 else if (PageSwapCache(mem_map+i))
504 cached++;
505 else if (!page_count(&mem_map[i]))
506 free++;
507 else
508 shared += page_count(&mem_map[i]) - 1;
509 }
510#else
511 for (i = 0; i < npmem_ranges; i++) {
512 int j;
513
514 for (j = node_start_pfn(i); j < node_end_pfn(i); j++) {
515 struct page *p;
208d54e5 516 unsigned long flags;
1da177e4 517
208d54e5 518 pgdat_resize_lock(NODE_DATA(i), &flags);
408fde81 519 p = nid_page_nr(i, j) - node_start_pfn(i);
1da177e4
LT		 520
521 total++;
522 if (PageReserved(p))
523 reserved++;
524 else if (PageSwapCache(p))
525 cached++;
526 else if (!page_count(p))
527 free++;
528 else
529 shared += page_count(p) - 1;
208d54e5 530 pgdat_resize_unlock(NODE_DATA(i), &flags);
1da177e4
LT		 531 }
532 }
533#endif
534 printk(KERN_INFO "%d pages of RAM\n", total);
535 printk(KERN_INFO "%d reserved pages\n", reserved);
536 printk(KERN_INFO "%d pages shared\n", shared);
537 printk(KERN_INFO "%d pages swap cached\n", cached);
538
539
540#ifdef CONFIG_DISCONTIGMEM
541 {
542 struct zonelist *zl;
543 int i, j, k;
544
545 for (i = 0; i < npmem_ranges; i++) {
546 for (j = 0; j < MAX_NR_ZONES; j++) {
547 zl = NODE_DATA(i)->node_zonelists + j;
548
549 printk("Zone list for zone %d on node %d: ", j, i);
550 for (k = 0; zl->zones[k] != NULL; k++)
89fa3024 551 printk("[%d/%s] ", zone_to_nid(zl->zones[k]), zl->zones[k]->name);
1da177e4
LT		 552 printk("\n");
553 }
554 }
555 }
556#endif
557}
558
559
560static void __init map_pages(unsigned long start_vaddr, unsigned long start_paddr, unsigned long size, pgprot_t pgprot)
561{
562 pgd_t *pg_dir;
563 pmd_t *pmd;
564 pte_t *pg_table;
565 unsigned long end_paddr;
566 unsigned long start_pmd;
567 unsigned long start_pte;
568 unsigned long tmp1;
569 unsigned long tmp2;
570 unsigned long address;
571 unsigned long ro_start;
572 unsigned long ro_end;
573 unsigned long fv_addr;
574 unsigned long gw_addr;
575 extern const unsigned long fault_vector_20;
576 extern void * const linux_gateway_page;
577
c51d476a 578 ro_start = __pa((unsigned long)_text);
1da177e4
LT		 579 ro_end = __pa((unsigned long)&data_start);
580 fv_addr = __pa((unsigned long)&fault_vector_20) & PAGE_MASK;
581 gw_addr = __pa((unsigned long)&linux_gateway_page) & PAGE_MASK;
582
583 end_paddr = start_paddr + size;
584
585 pg_dir = pgd_offset_k(start_vaddr);
586
587#if PTRS_PER_PMD == 1
588 start_pmd = 0;
589#else
590 start_pmd = ((start_vaddr >> PMD_SHIFT) & (PTRS_PER_PMD - 1));
591#endif
592 start_pte = ((start_vaddr >> PAGE_SHIFT) & (PTRS_PER_PTE - 1));
593
594 address = start_paddr;
595 while (address < end_paddr) {
596#if PTRS_PER_PMD == 1
597 pmd = (pmd_t *)__pa(pg_dir);
598#else
599 pmd = (pmd_t *)pgd_address(*pg_dir);
600
601 /*
602 * pmd is physical at this point
603 */
604
605 if (!pmd) {
606 pmd = (pmd_t *) alloc_bootmem_low_pages_node(NODE_DATA(0),PAGE_SIZE << PMD_ORDER);
607 pmd = (pmd_t *) __pa(pmd);
608 }
609
610 pgd_populate(NULL, pg_dir, __va(pmd));
611#endif
612 pg_dir++;
613
614 /* now change pmd to kernel virtual addresses */
615
616 pmd = (pmd_t *)__va(pmd) + start_pmd;
617 for (tmp1 = start_pmd; tmp1 < PTRS_PER_PMD; tmp1++,pmd++) {
618
619 /*
620 * pg_table is physical at this point
621 */
622
623 pg_table = (pte_t *)pmd_address(*pmd);
624 if (!pg_table) {
625 pg_table = (pte_t *)
626 alloc_bootmem_low_pages_node(NODE_DATA(0),PAGE_SIZE);
627 pg_table = (pte_t *) __pa(pg_table);
628 }
629
630 pmd_populate_kernel(NULL, pmd, __va(pg_table));
631
632 /* now change pg_table to kernel virtual addresses */
633
634 pg_table = (pte_t *) __va(pg_table) + start_pte;
635 for (tmp2 = start_pte; tmp2 < PTRS_PER_PTE; tmp2++,pg_table++) {
636 pte_t pte;
637
638 /*
639 * Map the fault vector writable so we can
640 * write the HPMC checksum.
641 */
2fd83038 642#if defined(CONFIG_PARISC_PAGE_SIZE_4KB)
1da177e4
LT		 643 if (address >= ro_start && address < ro_end
644 && address != fv_addr
645 && address != gw_addr)
646 pte = __mk_pte(address, PAGE_KERNEL_RO);
647 else
2fd83038 648#endif
1da177e4
LT		 649 pte = __mk_pte(address, pgprot);
650
651 if (address >= end_paddr)
652 pte_val(pte) = 0;
653
654 set_pte(pg_table, pte);
655
656 address += PAGE_SIZE;
657 }
658 start_pte = 0;
659
660 if (address >= end_paddr)
661 break;
662 }
663 start_pmd = 0;
664 }
665}
666
667/*
668 * pagetable_init() sets up the page tables
669 *
670 * Note that gateway_init() places the Linux gateway page at page 0.
671 * Since gateway pages cannot be dereferenced this has the desirable
672 * side effect of trapping those pesky NULL-reference errors in the
673 * kernel.
674 */
675static void __init pagetable_init(void)
676{
677 int range;
678
679 /* Map each physical memory range to its kernel vaddr */
680
681 for (range = 0; range < npmem_ranges; range++) {
682 unsigned long start_paddr;
683 unsigned long end_paddr;
684 unsigned long size;
685
686 start_paddr = pmem_ranges[range].start_pfn << PAGE_SHIFT;
687 end_paddr = start_paddr + (pmem_ranges[range].pages << PAGE_SHIFT);
688 size = pmem_ranges[range].pages << PAGE_SHIFT;
689
690 map_pages((unsigned long)__va(start_paddr), start_paddr,
691 size, PAGE_KERNEL);
692 }
693
694#ifdef CONFIG_BLK_DEV_INITRD
695 if (initrd_end && initrd_end > mem_limit) {
1bcdd854 696 printk(KERN_INFO "initrd: mapping %08lx-%08lx\n", initrd_start, initrd_end);
1da177e4
LT		 697 map_pages(initrd_start, __pa(initrd_start),
698 initrd_end - initrd_start, PAGE_KERNEL);
699 }
700#endif
701
702 empty_zero_page = alloc_bootmem_pages(PAGE_SIZE);
703 memset(empty_zero_page, 0, PAGE_SIZE);
704}
705
706static void __init gateway_init(void)
707{
708 unsigned long linux_gateway_page_addr;
709 /* FIXME: This is 'const' in order to trick the compiler
710 into not treating it as DP-relative data. */
711 extern void * const linux_gateway_page;
712
713 linux_gateway_page_addr = LINUX_GATEWAY_ADDR & PAGE_MASK;
714
715 /*
716 * Setup Linux Gateway page.
717 *
718 * The Linux gateway page will reside in kernel space (on virtual
719 * page 0), so it doesn't need to be aliased into user space.
720 */
721
722 map_pages(linux_gateway_page_addr, __pa(&linux_gateway_page),
723 PAGE_SIZE, PAGE_GATEWAY);
724}
725
726#ifdef CONFIG_HPUX
727void
728map_hpux_gateway_page(struct task_struct *tsk, struct mm_struct *mm)
729{
730 pgd_t *pg_dir;
731 pmd_t *pmd;
732 pte_t *pg_table;
733 unsigned long start_pmd;
734 unsigned long start_pte;
735 unsigned long address;
736 unsigned long hpux_gw_page_addr;
737 /* FIXME: This is 'const' in order to trick the compiler
738 into not treating it as DP-relative data. */
739 extern void * const hpux_gateway_page;
740
741 hpux_gw_page_addr = HPUX_GATEWAY_ADDR & PAGE_MASK;
742
743 /*
744 * Setup HP-UX Gateway page.
745 *
746 * The HP-UX gateway page resides in the user address space,
747 * so it needs to be aliased into each process.
748 */
749
750 pg_dir = pgd_offset(mm,hpux_gw_page_addr);
751
752#if PTRS_PER_PMD == 1
753 start_pmd = 0;
754#else
755 start_pmd = ((hpux_gw_page_addr >> PMD_SHIFT) & (PTRS_PER_PMD - 1));
756#endif
757 start_pte = ((hpux_gw_page_addr >> PAGE_SHIFT) & (PTRS_PER_PTE - 1));
758
759 address = __pa(&hpux_gateway_page);
760#if PTRS_PER_PMD == 1
761 pmd = (pmd_t *)__pa(pg_dir);
762#else
763 pmd = (pmd_t *) pgd_address(*pg_dir);
764
765 /*
766 * pmd is physical at this point
767 */
768
769 if (!pmd) {
770 pmd = (pmd_t *) get_zeroed_page(GFP_KERNEL);
771 pmd = (pmd_t *) __pa(pmd);
772 }
773
774 __pgd_val_set(*pg_dir, PxD_FLAG_PRESENT | PxD_FLAG_VALID | (unsigned long) pmd);
775#endif
776 /* now change pmd to kernel virtual addresses */
777
778 pmd = (pmd_t *)__va(pmd) + start_pmd;
779
780 /*
781 * pg_table is physical at this point
782 */
783
784 pg_table = (pte_t *) pmd_address(*pmd);
785 if (!pg_table)
786 pg_table = (pte_t *) __pa(get_zeroed_page(GFP_KERNEL));
787
788 __pmd_val_set(*pmd, PxD_FLAG_PRESENT | PxD_FLAG_VALID | (unsigned long) pg_table);
789
790 /* now change pg_table to kernel virtual addresses */
791
792 pg_table = (pte_t *) __va(pg_table) + start_pte;
793 set_pte(pg_table, __mk_pte(address, PAGE_GATEWAY));
794}
795EXPORT_SYMBOL(map_hpux_gateway_page);
796#endif
797
1da177e4
LT		 798void __init paging_init(void)
799{
800 int i;
801
802 setup_bootmem();
803 pagetable_init();
804 gateway_init();
805 flush_cache_all_local(); /* start with known state */
ce33941f 806 flush_tlb_all_local(NULL);
1da177e4
LT		 807
808 for (i = 0; i < npmem_ranges; i++) {
f06a9684 809 unsigned long zones_size[MAX_NR_ZONES] = { 0, };
1da177e4 810
00592837 811 zones_size[ZONE_NORMAL] = pmem_ranges[i].pages;
1da177e4
LT		 812
813#ifdef CONFIG_DISCONTIGMEM
814 /* Need to initialize the pfnnid_map before we can initialize
815 the zone */
816 {
817 int j;
818 for (j = (pmem_ranges[i].start_pfn >> PFNNID_SHIFT);
819 j <= ((pmem_ranges[i].start_pfn + pmem_ranges[i].pages) >> PFNNID_SHIFT);
820 j++) {
821 pfnnid_map[j] = i;
822 }
823 }
824#endif
825
826 free_area_init_node(i, NODE_DATA(i), zones_size,
827 pmem_ranges[i].start_pfn, NULL);
828 }
829}
830
831#ifdef CONFIG_PA20
832
833/*
834 * Currently, all PA20 chips have 18 bit protection id's, which is the
835 * limiting factor (space ids are 32 bits).
836 */
837
838#define NR_SPACE_IDS 262144
839
840#else
841
842/*
843 * Currently we have a one-to-one relationship between space id's and
844 * protection id's. Older parisc chips (PCXS, PCXT, PCXL, PCXL2) only
845 * support 15 bit protection id's, so that is the limiting factor.
846 * PCXT' has 18 bit protection id's, but only 16 bit spaceids, so it's
847 * probably not worth the effort for a special case here.
848 */
849
850#define NR_SPACE_IDS 32768
851
852#endif /* !CONFIG_PA20 */
853
854#define RECYCLE_THRESHOLD (NR_SPACE_IDS / 2)
855#define SID_ARRAY_SIZE (NR_SPACE_IDS / (8 * sizeof(long)))
856
857static unsigned long space_id[SID_ARRAY_SIZE] = { 1 }; /* disallow space 0 */
858static unsigned long dirty_space_id[SID_ARRAY_SIZE];
859static unsigned long space_id_index;
860static unsigned long free_space_ids = NR_SPACE_IDS - 1;
861static unsigned long dirty_space_ids = 0;
862
863static DEFINE_SPINLOCK(sid_lock);
864
865unsigned long alloc_sid(void)
866{
867 unsigned long index;
868
869 spin_lock(&sid_lock);
870
871 if (free_space_ids == 0) {
872 if (dirty_space_ids != 0) {
873 spin_unlock(&sid_lock);
874 flush_tlb_all(); /* flush_tlb_all() calls recycle_sids() */
875 spin_lock(&sid_lock);
876 }
2fd83038 877 BUG_ON(free_space_ids == 0);
1da177e4
LT		 878 }
879
880 free_space_ids--;
881
882 index = find_next_zero_bit(space_id, NR_SPACE_IDS, space_id_index);
883 space_id[index >> SHIFT_PER_LONG] |= (1L << (index & (BITS_PER_LONG - 1)));
884 space_id_index = index;
885
886 spin_unlock(&sid_lock);
887
888 return index << SPACEID_SHIFT;
889}
890
891void free_sid(unsigned long spaceid)
892{
893 unsigned long index = spaceid >> SPACEID_SHIFT;
894 unsigned long *dirty_space_offset;
895
896 dirty_space_offset = dirty_space_id + (index >> SHIFT_PER_LONG);
897 index &= (BITS_PER_LONG - 1);
898
899 spin_lock(&sid_lock);
900
2fd83038 901 BUG_ON(*dirty_space_offset & (1L << index)); /* attempt to free space id twice */
1da177e4
LT		 902
903 *dirty_space_offset |= (1L << index);
904 dirty_space_ids++;
905
906 spin_unlock(&sid_lock);
907}
908
909
910#ifdef CONFIG_SMP
911static void get_dirty_sids(unsigned long *ndirtyptr,unsigned long *dirty_array)
912{
913 int i;
914
915 /* NOTE: sid_lock must be held upon entry */
916
917 *ndirtyptr = dirty_space_ids;
918 if (dirty_space_ids != 0) {
919 for (i = 0; i < SID_ARRAY_SIZE; i++) {
920 dirty_array[i] = dirty_space_id[i];
921 dirty_space_id[i] = 0;
922 }
923 dirty_space_ids = 0;
924 }
925
926 return;
927}
928
929static void recycle_sids(unsigned long ndirty,unsigned long *dirty_array)
930{
931 int i;
932
933 /* NOTE: sid_lock must be held upon entry */
934
935 if (ndirty != 0) {
936 for (i = 0; i < SID_ARRAY_SIZE; i++) {
937 space_id[i] ^= dirty_array[i];
938 }
939
940 free_space_ids += ndirty;
941 space_id_index = 0;
942 }
943}
944
945#else /* CONFIG_SMP */
946
947static void recycle_sids(void)
948{
949 int i;
950
951 /* NOTE: sid_lock must be held upon entry */
952
953 if (dirty_space_ids != 0) {
954 for (i = 0; i < SID_ARRAY_SIZE; i++) {
955 space_id[i] ^= dirty_space_id[i];
956 dirty_space_id[i] = 0;
957 }
958
959 free_space_ids += dirty_space_ids;
960 dirty_space_ids = 0;
961 space_id_index = 0;
962 }
963}
964#endif
965
966/*
967 * flush_tlb_all() calls recycle_sids(), since whenever the entire tlb is
968 * purged, we can safely reuse the space ids that were released but
969 * not flushed from the tlb.
970 */
971
972#ifdef CONFIG_SMP
973
974static unsigned long recycle_ndirty;
975static unsigned long recycle_dirty_array[SID_ARRAY_SIZE];
2fd83038 976static unsigned int recycle_inuse;
1da177e4
LT		 977
978void flush_tlb_all(void)
979{
980 int do_recycle;
981
982 do_recycle = 0;
983 spin_lock(&sid_lock);
984 if (dirty_space_ids > RECYCLE_THRESHOLD) {
2fd83038 985 BUG_ON(recycle_inuse); /* FIXME: Use a semaphore/wait queue here */
1da177e4
LT		 986 get_dirty_sids(&recycle_ndirty,recycle_dirty_array);
987 recycle_inuse++;
988 do_recycle++;
989 }
990 spin_unlock(&sid_lock);
ce33941f 991 on_each_cpu(flush_tlb_all_local, NULL, 1, 1);
1da177e4
LT		 992 if (do_recycle) {
993 spin_lock(&sid_lock);
994 recycle_sids(recycle_ndirty,recycle_dirty_array);
995 recycle_inuse = 0;
996 spin_unlock(&sid_lock);
997 }
998}
999#else
1000void flush_tlb_all(void)
1001{
1002 spin_lock(&sid_lock);
1b2425e3 1003 flush_tlb_all_local(NULL);
1da177e4
LT		 1004 recycle_sids();
1005 spin_unlock(&sid_lock);
1006}
1007#endif
1008
1009#ifdef CONFIG_BLK_DEV_INITRD
1010void free_initrd_mem(unsigned long start, unsigned long end)
1011{
94c3e87a
HD		 1012 if (start >= end)
1013 return;
1014 printk(KERN_INFO "Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
1da177e4
LT		 1015 for (; start < end; start += PAGE_SIZE) {
1016 ClearPageReserved(virt_to_page(start));
7835e98b 1017 init_page_count(virt_to_page(start));
1da177e4
LT		 1018 free_page(start);
1019 num_physpages++;
1020 totalram_pages++;
1021 }
1da177e4
LT		 1022}
1023#endif
Linux 6.x block layer and io_uring tree(s)