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parisc: Drop hpux_stat64 struct from stat.h header file
[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)
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 34extern int data_start;
161bd3bf 35extern void parisc_kernel_start(void); /* Kernel entry point in head.S */
1da177e4 36
f24ffde4 37#if CONFIG_PGTABLE_LEVELS == 3
c39f52a9
TG		 38/* NOTE: This layout exactly conforms to the hybrid L2/L3 page table layout
39 * with the first pmd adjacent to the pgd and below it. gcc doesn't actually
40 * guarantee that global objects will be laid out in memory in the same order
41 * as the order of declaration, so put these in different sections and use
42 * the linker script to order them. */
43pmd_t pmd0[PTRS_PER_PMD] __attribute__ ((__section__ (".data..vm0.pmd"), aligned(PAGE_SIZE)));
44#endif
45
46pgd_t swapper_pg_dir[PTRS_PER_PGD] __attribute__ ((__section__ (".data..vm0.pgd"), aligned(PAGE_SIZE)));
47pte_t pg0[PT_INITIAL * PTRS_PER_PTE] __attribute__ ((__section__ (".data..vm0.pte"), aligned(PAGE_SIZE)));
48
1da177e4 49#ifdef CONFIG_DISCONTIGMEM
8039de10 50struct node_map_data node_data[MAX_NUMNODES] __read_mostly;
91ea8207 51signed char pfnnid_map[PFNNID_MAP_MAX] __read_mostly;
1da177e4
LT		 52#endif
53
54static struct resource data_resource = {
55 .name = "Kernel data",
56 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
57};
58
59static struct resource code_resource = {
60 .name = "Kernel code",
61 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
62};
63
64static struct resource pdcdata_resource = {
65 .name = "PDC data (Page Zero)",
66 .start = 0,
67 .end = 0x9ff,
68 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
69};
70
8039de10 71static struct resource sysram_resources[MAX_PHYSMEM_RANGES] __read_mostly;
1da177e4
LT		 72
73/* The following array is initialized from the firmware specific
74 * information retrieved in kernel/inventory.c.
75 */
76
8039de10
HD		 77physmem_range_t pmem_ranges[MAX_PHYSMEM_RANGES] __read_mostly;
78int npmem_ranges __read_mostly;
1da177e4 79
a8f44e38 80#ifdef CONFIG_64BIT
1da177e4 81#define MAX_MEM (~0UL)
a8f44e38 82#else /* !CONFIG_64BIT */
1da177e4 83#define MAX_MEM (3584U*1024U*1024U)
a8f44e38 84#endif /* !CONFIG_64BIT */
1da177e4 85
8039de10 86static unsigned long mem_limit __read_mostly = MAX_MEM;
1da177e4
LT		 87
88static void __init mem_limit_func(void)
89{
90 char *cp, *end;
91 unsigned long limit;
1da177e4
LT		 92
93 /* We need this before __setup() functions are called */
94
95 limit = MAX_MEM;
668f9931 96 for (cp = boot_command_line; *cp; ) {
1da177e4
LT		 97 if (memcmp(cp, "mem=", 4) == 0) {
98 cp += 4;
99 limit = memparse(cp, &end);
100 if (end != cp)
101 break;
102 cp = end;
103 } else {
104 while (*cp != ' ' && *cp)
105 ++cp;
106 while (*cp == ' ')
107 ++cp;
108 }
109 }
110
111 if (limit < mem_limit)
112 mem_limit = limit;
113}
114
115#define MAX_GAP (0x40000000UL >> PAGE_SHIFT)
116
117static void __init setup_bootmem(void)
118{
119 unsigned long bootmap_size;
120 unsigned long mem_max;
121 unsigned long bootmap_pages;
122 unsigned long bootmap_start_pfn;
123 unsigned long bootmap_pfn;
124#ifndef CONFIG_DISCONTIGMEM
125 physmem_range_t pmem_holes[MAX_PHYSMEM_RANGES - 1];
126 int npmem_holes;
127#endif
128 int i, sysram_resource_count;
129
130 disable_sr_hashing(); /* Turn off space register hashing */
131
132 /*
133 * Sort the ranges. Since the number of ranges is typically
134 * small, and performance is not an issue here, just do
135 * a simple insertion sort.
136 */
137
138 for (i = 1; i < npmem_ranges; i++) {
139 int j;
140
141 for (j = i; j > 0; j--) {
142 unsigned long tmp;
143
144 if (pmem_ranges[j-1].start_pfn <
145 pmem_ranges[j].start_pfn) {
146
147 break;
148 }
149 tmp = pmem_ranges[j-1].start_pfn;
150 pmem_ranges[j-1].start_pfn = pmem_ranges[j].start_pfn;
151 pmem_ranges[j].start_pfn = tmp;
152 tmp = pmem_ranges[j-1].pages;
153 pmem_ranges[j-1].pages = pmem_ranges[j].pages;
154 pmem_ranges[j].pages = tmp;
155 }
156 }
157
158#ifndef CONFIG_DISCONTIGMEM
159 /*
160 * Throw out ranges that are too far apart (controlled by
161 * MAX_GAP).
162 */
163
164 for (i = 1; i < npmem_ranges; i++) {
165 if (pmem_ranges[i].start_pfn -
166 (pmem_ranges[i-1].start_pfn +
167 pmem_ranges[i-1].pages) > MAX_GAP) {
168 npmem_ranges = i;
169 printk("Large gap in memory detected (%ld pages). "
170 "Consider turning on CONFIG_DISCONTIGMEM\n",
171 pmem_ranges[i].start_pfn -
172 (pmem_ranges[i-1].start_pfn +
173 pmem_ranges[i-1].pages));
174 break;
175 }
176 }
177#endif
178
179 if (npmem_ranges > 1) {
180
181 /* Print the memory ranges */
182
183 printk(KERN_INFO "Memory Ranges:\n");
184
185 for (i = 0; i < npmem_ranges; i++) {
186 unsigned long start;
187 unsigned long size;
188
189 size = (pmem_ranges[i].pages << PAGE_SHIFT);
190 start = (pmem_ranges[i].start_pfn << PAGE_SHIFT);
191 printk(KERN_INFO "%2d) Start 0x%016lx End 0x%016lx Size %6ld MB\n",
192 i,start, start + (size - 1), size >> 20);
193 }
194 }
195
196 sysram_resource_count = npmem_ranges;
197 for (i = 0; i < sysram_resource_count; i++) {
198 struct resource *res = &sysram_resources[i];
199 res->name = "System RAM";
200 res->start = pmem_ranges[i].start_pfn << PAGE_SHIFT;
201 res->end = res->start + (pmem_ranges[i].pages << PAGE_SHIFT)-1;
202 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
203 request_resource(&iomem_resource, res);
204 }
205
206 /*
207 * For 32 bit kernels we limit the amount of memory we can
208 * support, in order to preserve enough kernel address space
209 * for other purposes. For 64 bit kernels we don't normally
210 * limit the memory, but this mechanism can be used to
211 * artificially limit the amount of memory (and it is written
212 * to work with multiple memory ranges).
213 */
214
215 mem_limit_func(); /* check for "mem=" argument */
216
217 mem_max = 0;
1da177e4
LT		 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 }
1da177e4
LT		 232 break;
233 }
1da177e4
LT		 234 mem_max += rsize;
235 }
236
237 printk(KERN_INFO "Total Memory: %ld MB\n",mem_max >> 20);
238
239#ifndef CONFIG_DISCONTIGMEM
240 /* Merge the ranges, keeping track of the holes */
241
242 {
243 unsigned long end_pfn;
244 unsigned long hole_pages;
245
246 npmem_holes = 0;
247 end_pfn = pmem_ranges[0].start_pfn + pmem_ranges[0].pages;
248 for (i = 1; i < npmem_ranges; i++) {
249
250 hole_pages = pmem_ranges[i].start_pfn - end_pfn;
251 if (hole_pages) {
252 pmem_holes[npmem_holes].start_pfn = end_pfn;
253 pmem_holes[npmem_holes++].pages = hole_pages;
254 end_pfn += hole_pages;
255 }
256 end_pfn += pmem_ranges[i].pages;
257 }
258
259 pmem_ranges[0].pages = end_pfn - pmem_ranges[0].start_pfn;
260 npmem_ranges = 1;
261 }
262#endif
263
264 bootmap_pages = 0;
265 for (i = 0; i < npmem_ranges; i++)
266 bootmap_pages += bootmem_bootmap_pages(pmem_ranges[i].pages);
267
268 bootmap_start_pfn = PAGE_ALIGN(__pa((unsigned long) &_end)) >> PAGE_SHIFT;
269
270#ifdef CONFIG_DISCONTIGMEM
271 for (i = 0; i < MAX_PHYSMEM_RANGES; i++) {
272 memset(NODE_DATA(i), 0, sizeof(pg_data_t));
b61bfa3c 273 NODE_DATA(i)->bdata = &bootmem_node_data[i];
1da177e4
LT		 274 }
275 memset(pfnnid_map, 0xff, sizeof(pfnnid_map));
276
d9b41e0b
DR		 277 for (i = 0; i < npmem_ranges; i++) {
278 node_set_state(i, N_NORMAL_MEMORY);
1da177e4 279 node_set_online(i);
d9b41e0b 280 }
1da177e4
LT		 281#endif
282
283 /*
284 * Initialize and free the full range of memory in each range.
285 * Note that the only writing these routines do are to the bootmap,
286 * and we've made sure to locate the bootmap properly so that they
287 * won't be writing over anything important.
288 */
289
290 bootmap_pfn = bootmap_start_pfn;
291 max_pfn = 0;
292 for (i = 0; i < npmem_ranges; i++) {
293 unsigned long start_pfn;
294 unsigned long npages;
295
296 start_pfn = pmem_ranges[i].start_pfn;
297 npages = pmem_ranges[i].pages;
298
299 bootmap_size = init_bootmem_node(NODE_DATA(i),
300 bootmap_pfn,
301 start_pfn,
302 (start_pfn + npages) );
303 free_bootmem_node(NODE_DATA(i),
304 (start_pfn << PAGE_SHIFT),
305 (npages << PAGE_SHIFT) );
306 bootmap_pfn += (bootmap_size + PAGE_SIZE - 1) >> PAGE_SHIFT;
307 if ((start_pfn + npages) > max_pfn)
308 max_pfn = start_pfn + npages;
309 }
310
5cdb8205
GG		 311 /* IOMMU is always used to access "high mem" on those boxes
312 * that can support enough mem that a PCI device couldn't
313 * directly DMA to any physical addresses.
314 * ISA DMA support will need to revisit this.
315 */
316 max_low_pfn = max_pfn;
317
8980a7ba
HD		 318 /* bootmap sizing messed up? */
319 BUG_ON((bootmap_pfn - bootmap_start_pfn) != bootmap_pages);
1da177e4
LT		 320
321 /* reserve PAGE0 pdc memory, kernel text/data/bss & bootmap */
322
323#define PDC_CONSOLE_IO_IODC_SIZE 32768
324
325 reserve_bootmem_node(NODE_DATA(0), 0UL,
72a7fe39
BW		 326 (unsigned long)(PAGE0->mem_free +
327 PDC_CONSOLE_IO_IODC_SIZE), BOOTMEM_DEFAULT);
161bd3bf
HD		 328 reserve_bootmem_node(NODE_DATA(0), __pa(KERNEL_BINARY_TEXT_START),
329 (unsigned long)(_end - KERNEL_BINARY_TEXT_START),
330 BOOTMEM_DEFAULT);
1da177e4 331 reserve_bootmem_node(NODE_DATA(0), (bootmap_start_pfn << PAGE_SHIFT),
72a7fe39
BW		 332 ((bootmap_pfn - bootmap_start_pfn) << PAGE_SHIFT),
333 BOOTMEM_DEFAULT);
1da177e4
LT		 334
335#ifndef CONFIG_DISCONTIGMEM
336
337 /* reserve the holes */
338
339 for (i = 0; i < npmem_holes; i++) {
340 reserve_bootmem_node(NODE_DATA(0),
341 (pmem_holes[i].start_pfn << PAGE_SHIFT),
72a7fe39
BW		 342 (pmem_holes[i].pages << PAGE_SHIFT),
343 BOOTMEM_DEFAULT);
1da177e4
LT		 344 }
345#endif
346
347#ifdef CONFIG_BLK_DEV_INITRD
348 if (initrd_start) {
349 printk(KERN_INFO "initrd: %08lx-%08lx\n", initrd_start, initrd_end);
350 if (__pa(initrd_start) < mem_max) {
351 unsigned long initrd_reserve;
352
353 if (__pa(initrd_end) > mem_max) {
354 initrd_reserve = mem_max - __pa(initrd_start);
355 } else {
356 initrd_reserve = initrd_end - initrd_start;
357 }
358 initrd_below_start_ok = 1;
359 printk(KERN_INFO "initrd: reserving %08lx-%08lx (mem_max %08lx)\n", __pa(initrd_start), __pa(initrd_start) + initrd_reserve, mem_max);
360
72a7fe39
BW		 361 reserve_bootmem_node(NODE_DATA(0), __pa(initrd_start),
362 initrd_reserve, BOOTMEM_DEFAULT);
1da177e4
LT		 363 }
364 }
365#endif
366
367 data_resource.start = virt_to_phys(&data_start);
c51d476a
KM		 368 data_resource.end = virt_to_phys(_end) - 1;
369 code_resource.start = virt_to_phys(_text);
1da177e4
LT		 370 code_resource.end = virt_to_phys(&data_start)-1;
371
372 /* We don't know which region the kernel will be in, so try
373 * all of them.
374 */
375 for (i = 0; i < sysram_resource_count; i++) {
376 struct resource *res = &sysram_resources[i];
377 request_resource(res, &code_resource);
378 request_resource(res, &data_resource);
379 }
380 request_resource(&sysram_resources[0], &pdcdata_resource);
381}
382
161bd3bf
HD		 383static int __init parisc_text_address(unsigned long vaddr)
384{
385 static unsigned long head_ptr __initdata;
386
387 if (!head_ptr)
388 head_ptr = PAGE_MASK & (unsigned long)
389 dereference_function_descriptor(&parisc_kernel_start);
390
391 return core_kernel_text(vaddr) || vaddr == head_ptr;
392}
393
d7dd2ff1
JB		 394static void __init map_pages(unsigned long start_vaddr,
395 unsigned long start_paddr, unsigned long size,
396 pgprot_t pgprot, int force)
397{
398 pgd_t *pg_dir;
399 pmd_t *pmd;
400 pte_t *pg_table;
401 unsigned long end_paddr;
402 unsigned long start_pmd;
403 unsigned long start_pte;
404 unsigned long tmp1;
405 unsigned long tmp2;
406 unsigned long address;
407 unsigned long vaddr;
408 unsigned long ro_start;
409 unsigned long ro_end;
410 unsigned long fv_addr;
411 unsigned long gw_addr;
412 extern const unsigned long fault_vector_20;
413 extern void * const linux_gateway_page;
414
415 ro_start = __pa((unsigned long)_text);
416 ro_end = __pa((unsigned long)&data_start);
417 fv_addr = __pa((unsigned long)&fault_vector_20) & PAGE_MASK;
418 gw_addr = __pa((unsigned long)&linux_gateway_page) & PAGE_MASK;
419
420 end_paddr = start_paddr + size;
421
422 pg_dir = pgd_offset_k(start_vaddr);
423
424#if PTRS_PER_PMD == 1
425 start_pmd = 0;
426#else
427 start_pmd = ((start_vaddr >> PMD_SHIFT) & (PTRS_PER_PMD - 1));
428#endif
429 start_pte = ((start_vaddr >> PAGE_SHIFT) & (PTRS_PER_PTE - 1));
430
431 address = start_paddr;
432 vaddr = start_vaddr;
433 while (address < end_paddr) {
434#if PTRS_PER_PMD == 1
435 pmd = (pmd_t *)__pa(pg_dir);
436#else
437 pmd = (pmd_t *)pgd_address(*pg_dir);
438
439 /*
440 * pmd is physical at this point
441 */
442
443 if (!pmd) {
444 pmd = (pmd_t *) alloc_bootmem_low_pages_node(NODE_DATA(0), PAGE_SIZE << PMD_ORDER);
445 pmd = (pmd_t *) __pa(pmd);
446 }
447
448 pgd_populate(NULL, pg_dir, __va(pmd));
449#endif
450 pg_dir++;
451
452 /* now change pmd to kernel virtual addresses */
453
454 pmd = (pmd_t *)__va(pmd) + start_pmd;
455 for (tmp1 = start_pmd; tmp1 < PTRS_PER_PMD; tmp1++, pmd++) {
456
457 /*
458 * pg_table is physical at this point
459 */
460
461 pg_table = (pte_t *)pmd_address(*pmd);
462 if (!pg_table) {
463 pg_table = (pte_t *)
464 alloc_bootmem_low_pages_node(NODE_DATA(0), PAGE_SIZE);
465 pg_table = (pte_t *) __pa(pg_table);
466 }
467
468 pmd_populate_kernel(NULL, pmd, __va(pg_table));
469
470 /* now change pg_table to kernel virtual addresses */
471
472 pg_table = (pte_t *) __va(pg_table) + start_pte;
473 for (tmp2 = start_pte; tmp2 < PTRS_PER_PTE; tmp2++, pg_table++) {
474 pte_t pte;
475
476 /*
477 * Map the fault vector writable so we can
478 * write the HPMC checksum.
479 */
480 if (force)
481 pte = __mk_pte(address, pgprot);
161bd3bf 482 else if (parisc_text_address(vaddr) &&
d7dd2ff1
JB		 483 address != fv_addr)
484 pte = __mk_pte(address, PAGE_KERNEL_EXEC);
485 else
486#if defined(CONFIG_PARISC_PAGE_SIZE_4KB)
487 if (address >= ro_start && address < ro_end
488 && address != fv_addr
489 && address != gw_addr)
490 pte = __mk_pte(address, PAGE_KERNEL_RO);
491 else
492#endif
493 pte = __mk_pte(address, pgprot);
494
495 if (address >= end_paddr) {
496 if (force)
497 break;
498 else
499 pte_val(pte) = 0;
500 }
501
502 set_pte(pg_table, pte);
503
504 address += PAGE_SIZE;
505 vaddr += PAGE_SIZE;
506 }
507 start_pte = 0;
508
509 if (address >= end_paddr)
510 break;
511 }
512 start_pmd = 0;
513 }
514}
515
1da177e4
LT		 516void free_initmem(void)
517{
4fb11781
KM		 518 unsigned long init_begin = (unsigned long)__init_begin;
519 unsigned long init_end = (unsigned long)__init_end;
1da177e4 520
d7dd2ff1
JB		 521 /* The init text pages are marked R-X. We have to
522 * flush the icache and mark them RW-
523 *
524 * This is tricky, because map_pages is in the init section.
525 * Do a dummy remap of the data section first (the data
526 * section is already PAGE_KERNEL) to pull in the TLB entries
527 * for map_kernel */
528 map_pages(init_begin, __pa(init_begin), init_end - init_begin,
529 PAGE_KERNEL_RWX, 1);
530 /* now remap at PAGE_KERNEL since the TLB is pre-primed to execute
531 * map_pages */
532 map_pages(init_begin, __pa(init_begin), init_end - init_begin,
533 PAGE_KERNEL, 1);
534
535 /* force the kernel to see the new TLB entries */
536 __flush_tlb_range(0, init_begin, init_end);
1da177e4
LT		 537 /* Attempt to catch anyone trying to execute code here
538 * by filling the page with BRK insns.
1da177e4 539 */
20dbc9f7 540 memset((void *)init_begin, 0x00, init_end - init_begin);
d7dd2ff1
JB		 541 /* finally dump all the instructions which were cached, since the
542 * pages are no-longer executable */
4fb11781 543 flush_icache_range(init_begin, init_end);
1da177e4 544
7d2c7747 545 free_initmem_default(-1);
1da177e4
LT		 546
547 /* set up a new led state on systems shipped LED State panel */
548 pdc_chassis_send_status(PDC_CHASSIS_DIRECT_BCOMPLETE);
1da177e4
LT		 549}
550
1bcdd854
HD		 551
552#ifdef CONFIG_DEBUG_RODATA
553void mark_rodata_ro(void)
554{
1bcdd854
HD		 555 /* rodata memory was already mapped with KERNEL_RO access rights by
556 pagetable_init() and map_pages(). No need to do additional stuff here */
557 printk (KERN_INFO "Write protecting the kernel read-only data: %luk\n",
a581c2a4 558 (unsigned long)(__end_rodata - __start_rodata) >> 10);
1bcdd854
HD		 559}
560#endif
561
562
1da177e4
LT		 563/*
564 * Just an arbitrary offset to serve as a "hole" between mapping areas
565 * (between top of physical memory and a potential pcxl dma mapping
566 * area, and below the vmalloc mapping area).
567 *
568 * The current 32K value just means that there will be a 32K "hole"
569 * between mapping areas. That means that any out-of-bounds memory
570 * accesses will hopefully be caught. The vmalloc() routines leaves
571 * a hole of 4kB between each vmalloced area for the same reason.
572 */
573
574 /* Leave room for gateway page expansion */
575#if KERNEL_MAP_START < GATEWAY_PAGE_SIZE
576#error KERNEL_MAP_START is in gateway reserved region
577#endif
578#define MAP_START (KERNEL_MAP_START)
579
580#define VM_MAP_OFFSET (32*1024)
581#define SET_MAP_OFFSET(x) ((void *)(((unsigned long)(x) + VM_MAP_OFFSET) \
582 & ~(VM_MAP_OFFSET-1)))
583
4255f0d2
HD		 584void *parisc_vmalloc_start __read_mostly;
585EXPORT_SYMBOL(parisc_vmalloc_start);
1da177e4
LT		 586
587#ifdef CONFIG_PA11
8039de10 588unsigned long pcxl_dma_start __read_mostly;
1da177e4
LT		 589#endif
590
591void __init mem_init(void)
592{
48d27cb2
HD		 593 /* Do sanity checks on page table constants */
594 BUILD_BUG_ON(PTE_ENTRY_SIZE != sizeof(pte_t));
595 BUILD_BUG_ON(PMD_ENTRY_SIZE != sizeof(pmd_t));
596 BUILD_BUG_ON(PGD_ENTRY_SIZE != sizeof(pgd_t));
597 BUILD_BUG_ON(PAGE_SHIFT + BITS_PER_PTE + BITS_PER_PMD + BITS_PER_PGD
598 > BITS_PER_LONG);
599
1da177e4 600 high_memory = __va((max_pfn << PAGE_SHIFT));
d5c017dd 601 set_max_mapnr(page_to_pfn(virt_to_page(high_memory - 1)) + 1);
0c988534 602 free_all_bootmem();
1da177e4 603
1da177e4
LT		 604#ifdef CONFIG_PA11
605 if (hppa_dma_ops == &pcxl_dma_ops) {
606 pcxl_dma_start = (unsigned long)SET_MAP_OFFSET(MAP_START);
4255f0d2
HD		 607 parisc_vmalloc_start = SET_MAP_OFFSET(pcxl_dma_start
608 + PCXL_DMA_MAP_SIZE);
1da177e4
LT		 609 } else {
610 pcxl_dma_start = 0;
4255f0d2 611 parisc_vmalloc_start = SET_MAP_OFFSET(MAP_START);
1da177e4
LT		 612 }
613#else
4255f0d2 614 parisc_vmalloc_start = SET_MAP_OFFSET(MAP_START);
1da177e4
LT		 615#endif
616
7d2c7747 617 mem_init_print_info(NULL);
ce8420bb
HD		 618#ifdef CONFIG_DEBUG_KERNEL /* double-sanity-check paranoia */
619 printk("virtual kernel memory layout:\n"
620 " vmalloc : 0x%p - 0x%p (%4ld MB)\n"
53faf291 621 " memory : 0x%p - 0x%p (%4ld MB)\n"
ce8420bb
HD		 622 " .init : 0x%p - 0x%p (%4ld kB)\n"
623 " .data : 0x%p - 0x%p (%4ld kB)\n"
624 " .text : 0x%p - 0x%p (%4ld kB)\n",
625
626 (void*)VMALLOC_START, (void*)VMALLOC_END,
627 (VMALLOC_END - VMALLOC_START) >> 20,
628
629 __va(0), high_memory,
630 ((unsigned long)high_memory - (unsigned long)__va(0)) >> 20,
631
53faf291
KM		 632 __init_begin, __init_end,
633 ((unsigned long)__init_end - (unsigned long)__init_begin) >> 10,
ce8420bb 634
53faf291
KM		 635 _etext, _edata,
636 ((unsigned long)_edata - (unsigned long)_etext) >> 10,
ce8420bb 637
53faf291
KM		 638 _text, _etext,
639 ((unsigned long)_etext - (unsigned long)_text) >> 10);
ce8420bb 640#endif
1da177e4
LT		 641}
642
8039de10 643unsigned long *empty_zero_page __read_mostly;
22febf1f 644EXPORT_SYMBOL(empty_zero_page);
1da177e4 645
b2b755b5 646void show_mem(unsigned int filter)
1da177e4 647{
aec6a888
MG		 648 int total = 0,reserved = 0;
649 pg_data_t *pgdat;
1da177e4
LT		 650
651 printk(KERN_INFO "Mem-info:\n");
7bf02ea2 652 show_free_areas(filter);
1da177e4 653
aec6a888
MG		 654 for_each_online_pgdat(pgdat) {
655 unsigned long flags;
656 int zoneid;
657
658 pgdat_resize_lock(pgdat, &flags);
659 for (zoneid = 0; zoneid < MAX_NR_ZONES; zoneid++) {
660 struct zone *zone = &pgdat->node_zones[zoneid];
661 if (!populated_zone(zone))
662 continue;
663
664 total += zone->present_pages;
665 reserved = zone->present_pages - zone->managed_pages;
666 }
667 pgdat_resize_unlock(pgdat, &flags);
1da177e4 668 }
aec6a888 669
1da177e4
LT		 670 printk(KERN_INFO "%d pages of RAM\n", total);
671 printk(KERN_INFO "%d reserved pages\n", reserved);
1da177e4
LT		 672
673#ifdef CONFIG_DISCONTIGMEM
674 {
675 struct zonelist *zl;
54a6eb5c 676 int i, j;
1da177e4
LT		 677
678 for (i = 0; i < npmem_ranges; i++) {
4413a0f6 679 zl = node_zonelist(i, 0);
1da177e4 680 for (j = 0; j < MAX_NR_ZONES; j++) {
dd1a239f 681 struct zoneref *z;
54a6eb5c 682 struct zone *zone;
1da177e4
LT		 683
684 printk("Zone list for zone %d on node %d: ", j, i);
54a6eb5c
MG		 685 for_each_zone_zonelist(zone, z, zl, j)
686 printk("[%d/%s] ", zone_to_nid(zone),
687 zone->name);
1da177e4
LT		 688 printk("\n");
689 }
690 }
691 }
692#endif
693}
694
1da177e4
LT		 695/*
696 * pagetable_init() sets up the page tables
697 *
698 * Note that gateway_init() places the Linux gateway page at page 0.
699 * Since gateway pages cannot be dereferenced this has the desirable
700 * side effect of trapping those pesky NULL-reference errors in the
701 * kernel.
702 */
703static void __init pagetable_init(void)
704{
705 int range;
706
707 /* Map each physical memory range to its kernel vaddr */
708
709 for (range = 0; range < npmem_ranges; range++) {
710 unsigned long start_paddr;
711 unsigned long end_paddr;
712 unsigned long size;
713
714 start_paddr = pmem_ranges[range].start_pfn << PAGE_SHIFT;
715 end_paddr = start_paddr + (pmem_ranges[range].pages << PAGE_SHIFT);
716 size = pmem_ranges[range].pages << PAGE_SHIFT;
717
718 map_pages((unsigned long)__va(start_paddr), start_paddr,
d7dd2ff1 719 size, PAGE_KERNEL, 0);
1da177e4
LT		 720 }
721
722#ifdef CONFIG_BLK_DEV_INITRD
723 if (initrd_end && initrd_end > mem_limit) {
1bcdd854 724 printk(KERN_INFO "initrd: mapping %08lx-%08lx\n", initrd_start, initrd_end);
1da177e4 725 map_pages(initrd_start, __pa(initrd_start),
d7dd2ff1 726 initrd_end - initrd_start, PAGE_KERNEL, 0);
1da177e4
LT		 727 }
728#endif
729
730 empty_zero_page = alloc_bootmem_pages(PAGE_SIZE);
1da177e4
LT		 731}
732
733static void __init gateway_init(void)
734{
735 unsigned long linux_gateway_page_addr;
736 /* FIXME: This is 'const' in order to trick the compiler
737 into not treating it as DP-relative data. */
738 extern void * const linux_gateway_page;
739
740 linux_gateway_page_addr = LINUX_GATEWAY_ADDR & PAGE_MASK;
741
742 /*
743 * Setup Linux Gateway page.
744 *
745 * The Linux gateway page will reside in kernel space (on virtual
746 * page 0), so it doesn't need to be aliased into user space.
747 */
748
749 map_pages(linux_gateway_page_addr, __pa(&linux_gateway_page),
d7dd2ff1 750 PAGE_SIZE, PAGE_GATEWAY, 1);
1da177e4
LT		 751}
752
1da177e4
LT		 753void __init paging_init(void)
754{
755 int i;
756
757 setup_bootmem();
758 pagetable_init();
759 gateway_init();
760 flush_cache_all_local(); /* start with known state */
ce33941f 761 flush_tlb_all_local(NULL);
1da177e4
LT		 762
763 for (i = 0; i < npmem_ranges; i++) {
f06a9684 764 unsigned long zones_size[MAX_NR_ZONES] = { 0, };
1da177e4 765
00592837 766 zones_size[ZONE_NORMAL] = pmem_ranges[i].pages;
1da177e4
LT		 767
768#ifdef CONFIG_DISCONTIGMEM
769 /* Need to initialize the pfnnid_map before we can initialize
770 the zone */
771 {
772 int j;
773 for (j = (pmem_ranges[i].start_pfn >> PFNNID_SHIFT);
774 j <= ((pmem_ranges[i].start_pfn + pmem_ranges[i].pages) >> PFNNID_SHIFT);
775 j++) {
776 pfnnid_map[j] = i;
777 }
778 }
779#endif
780
9109fb7b 781 free_area_init_node(i, zones_size,
1da177e4
LT		 782 pmem_ranges[i].start_pfn, NULL);
783 }
784}
785
786#ifdef CONFIG_PA20
787
788/*
7022672e 789 * Currently, all PA20 chips have 18 bit protection IDs, which is the
1da177e4
LT		 790 * limiting factor (space ids are 32 bits).
791 */
792
793#define NR_SPACE_IDS 262144
794
795#else
796
797/*
7022672e
SA		 798 * Currently we have a one-to-one relationship between space IDs and
799 * protection IDs. Older parisc chips (PCXS, PCXT, PCXL, PCXL2) only
800 * support 15 bit protection IDs, so that is the limiting factor.
801 * PCXT' has 18 bit protection IDs, but only 16 bit spaceids, so it's
1da177e4
LT		 802 * probably not worth the effort for a special case here.
803 */
804
805#define NR_SPACE_IDS 32768
806
807#endif /* !CONFIG_PA20 */
808
809#define RECYCLE_THRESHOLD (NR_SPACE_IDS / 2)
810#define SID_ARRAY_SIZE (NR_SPACE_IDS / (8 * sizeof(long)))
811
812static unsigned long space_id[SID_ARRAY_SIZE] = { 1 }; /* disallow space 0 */
813static unsigned long dirty_space_id[SID_ARRAY_SIZE];
814static unsigned long space_id_index;
815static unsigned long free_space_ids = NR_SPACE_IDS - 1;
816static unsigned long dirty_space_ids = 0;
817
818static DEFINE_SPINLOCK(sid_lock);
819
820unsigned long alloc_sid(void)
821{
822 unsigned long index;
823
824 spin_lock(&sid_lock);
825
826 if (free_space_ids == 0) {
827 if (dirty_space_ids != 0) {
828 spin_unlock(&sid_lock);
829 flush_tlb_all(); /* flush_tlb_all() calls recycle_sids() */
830 spin_lock(&sid_lock);
831 }
2fd83038 832 BUG_ON(free_space_ids == 0);
1da177e4
LT		 833 }
834
835 free_space_ids--;
836
837 index = find_next_zero_bit(space_id, NR_SPACE_IDS, space_id_index);
838 space_id[index >> SHIFT_PER_LONG] |= (1L << (index & (BITS_PER_LONG - 1)));
839 space_id_index = index;
840
841 spin_unlock(&sid_lock);
842
843 return index << SPACEID_SHIFT;
844}
845
846void free_sid(unsigned long spaceid)
847{
848 unsigned long index = spaceid >> SPACEID_SHIFT;
849 unsigned long *dirty_space_offset;
850
851 dirty_space_offset = dirty_space_id + (index >> SHIFT_PER_LONG);
852 index &= (BITS_PER_LONG - 1);
853
854 spin_lock(&sid_lock);
855
2fd83038 856 BUG_ON(*dirty_space_offset & (1L << index)); /* attempt to free space id twice */
1da177e4
LT		 857
858 *dirty_space_offset |= (1L << index);
859 dirty_space_ids++;
860
861 spin_unlock(&sid_lock);
862}
863
864
865#ifdef CONFIG_SMP
866static void get_dirty_sids(unsigned long *ndirtyptr,unsigned long *dirty_array)
867{
868 int i;
869
870 /* NOTE: sid_lock must be held upon entry */
871
872 *ndirtyptr = dirty_space_ids;
873 if (dirty_space_ids != 0) {
874 for (i = 0; i < SID_ARRAY_SIZE; i++) {
875 dirty_array[i] = dirty_space_id[i];
876 dirty_space_id[i] = 0;
877 }
878 dirty_space_ids = 0;
879 }
880
881 return;
882}
883
884static void recycle_sids(unsigned long ndirty,unsigned long *dirty_array)
885{
886 int i;
887
888 /* NOTE: sid_lock must be held upon entry */
889
890 if (ndirty != 0) {
891 for (i = 0; i < SID_ARRAY_SIZE; i++) {
892 space_id[i] ^= dirty_array[i];
893 }
894
895 free_space_ids += ndirty;
896 space_id_index = 0;
897 }
898}
899
900#else /* CONFIG_SMP */
901
902static void recycle_sids(void)
903{
904 int i;
905
906 /* NOTE: sid_lock must be held upon entry */
907
908 if (dirty_space_ids != 0) {
909 for (i = 0; i < SID_ARRAY_SIZE; i++) {
910 space_id[i] ^= dirty_space_id[i];
911 dirty_space_id[i] = 0;
912 }
913
914 free_space_ids += dirty_space_ids;
915 dirty_space_ids = 0;
916 space_id_index = 0;
917 }
918}
919#endif
920
921/*
922 * flush_tlb_all() calls recycle_sids(), since whenever the entire tlb is
923 * purged, we can safely reuse the space ids that were released but
924 * not flushed from the tlb.
925 */
926
927#ifdef CONFIG_SMP
928
929static unsigned long recycle_ndirty;
930static unsigned long recycle_dirty_array[SID_ARRAY_SIZE];
2fd83038 931static unsigned int recycle_inuse;
1da177e4
LT		 932
933void flush_tlb_all(void)
934{
935 int do_recycle;
936
416821d3 937 __inc_irq_stat(irq_tlb_count);
1da177e4
LT		 938 do_recycle = 0;
939 spin_lock(&sid_lock);
940 if (dirty_space_ids > RECYCLE_THRESHOLD) {
2fd83038 941 BUG_ON(recycle_inuse); /* FIXME: Use a semaphore/wait queue here */
1da177e4
LT		 942 get_dirty_sids(&recycle_ndirty,recycle_dirty_array);
943 recycle_inuse++;
944 do_recycle++;
945 }
946 spin_unlock(&sid_lock);
15c8b6c1 947 on_each_cpu(flush_tlb_all_local, NULL, 1);
1da177e4
LT		 948 if (do_recycle) {
949 spin_lock(&sid_lock);
950 recycle_sids(recycle_ndirty,recycle_dirty_array);
951 recycle_inuse = 0;
952 spin_unlock(&sid_lock);
953 }
954}
955#else
956void flush_tlb_all(void)
957{
416821d3 958 __inc_irq_stat(irq_tlb_count);
1da177e4 959 spin_lock(&sid_lock);
1b2425e3 960 flush_tlb_all_local(NULL);
1da177e4
LT		 961 recycle_sids();
962 spin_unlock(&sid_lock);
963}
964#endif
965
966#ifdef CONFIG_BLK_DEV_INITRD
967void free_initrd_mem(unsigned long start, unsigned long end)
968{
7d2c7747 969 free_reserved_area((void *)start, (void *)end, -1, "initrd");
1da177e4
LT		 970}
971#endif
Linux 6.x block layer and io_uring tree(s)