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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)
9 * Copyright 2006-2007 Helge Deller (deller@gmx.de)
10 *
11 */
12
13
14#include <linux/module.h>
15#include <linux/mm.h>
16#include <linux/bootmem.h>
17#include <linux/gfp.h>
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 */
26#include <linux/compat.h>
27
28#include <asm/pgalloc.h>
29#include <asm/pgtable.h>
30#include <asm/tlb.h>
31#include <asm/pdc_chassis.h>
32#include <asm/mmzone.h>
33#include <asm/sections.h>
34#include <asm/msgbuf.h>
35
36extern int data_start;
37extern void parisc_kernel_start(void); /* Kernel entry point in head.S */
38
39#if CONFIG_PGTABLE_LEVELS == 3
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. */
45pmd_t pmd0[PTRS_PER_PMD] __attribute__ ((__section__ (".data..vm0.pmd"), aligned(PAGE_SIZE)));
46#endif
47
48pgd_t swapper_pg_dir[PTRS_PER_PGD] __attribute__ ((__section__ (".data..vm0.pgd"), aligned(PAGE_SIZE)));
49pte_t pg0[PT_INITIAL * PTRS_PER_PTE] __attribute__ ((__section__ (".data..vm0.pte"), aligned(PAGE_SIZE)));
50
51#ifdef CONFIG_DISCONTIGMEM
52struct node_map_data node_data[MAX_NUMNODES] __read_mostly;
53signed char pfnnid_map[PFNNID_MAP_MAX] __read_mostly;
54#endif
55
56static struct resource data_resource = {
57 .name = "Kernel data",
58 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
59};
60
61static struct resource code_resource = {
62 .name = "Kernel code",
63 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
64};
65
66static struct resource pdcdata_resource = {
67 .name = "PDC data (Page Zero)",
68 .start = 0,
69 .end = 0x9ff,
70 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
71};
72
73static struct resource sysram_resources[MAX_PHYSMEM_RANGES] __read_mostly;
74
75/* The following array is initialized from the firmware specific
76 * information retrieved in kernel/inventory.c.
77 */
78
79physmem_range_t pmem_ranges[MAX_PHYSMEM_RANGES] __read_mostly;
80int npmem_ranges __read_mostly;
81
82#ifdef CONFIG_64BIT
83#define MAX_MEM (~0UL)
84#else /* !CONFIG_64BIT */
85#define MAX_MEM (3584U*1024U*1024U)
86#endif /* !CONFIG_64BIT */
87
88static unsigned long mem_limit __read_mostly = MAX_MEM;
89
90static void __init mem_limit_func(void)
91{
92 char *cp, *end;
93 unsigned long limit;
94
95 /* We need this before __setup() functions are called */
96
97 limit = MAX_MEM;
98 for (cp = boot_command_line; *cp; ) {
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
119static 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_SYSTEM_RAM | 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;
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 }
234 break;
235 }
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));
275 NODE_DATA(i)->bdata = &bootmem_node_data[i];
276 }
277 memset(pfnnid_map, 0xff, sizeof(pfnnid_map));
278
279 for (i = 0; i < npmem_ranges; i++) {
280 node_set_state(i, N_NORMAL_MEMORY);
281 node_set_online(i);
282 }
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
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
320 /* bootmap sizing messed up? */
321 BUG_ON((bootmap_pfn - bootmap_start_pfn) != bootmap_pages);
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,
328 (unsigned long)(PAGE0->mem_free +
329 PDC_CONSOLE_IO_IODC_SIZE), BOOTMEM_DEFAULT);
330 reserve_bootmem_node(NODE_DATA(0), __pa(KERNEL_BINARY_TEXT_START),
331 (unsigned long)(_end - KERNEL_BINARY_TEXT_START),
332 BOOTMEM_DEFAULT);
333 reserve_bootmem_node(NODE_DATA(0), (bootmap_start_pfn << PAGE_SHIFT),
334 ((bootmap_pfn - bootmap_start_pfn) << PAGE_SHIFT),
335 BOOTMEM_DEFAULT);
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),
344 (pmem_holes[i].pages << PAGE_SHIFT),
345 BOOTMEM_DEFAULT);
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
363 reserve_bootmem_node(NODE_DATA(0), __pa(initrd_start),
364 initrd_reserve, BOOTMEM_DEFAULT);
365 }
366 }
367#endif
368
369 data_resource.start = virt_to_phys(&data_start);
370 data_resource.end = virt_to_phys(_end) - 1;
371 code_resource.start = virt_to_phys(_text);
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
385static 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
396static 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 kernel_end;
413
414 ro_start = __pa((unsigned long)_text);
415 ro_end = __pa((unsigned long)&data_start);
416 kernel_end = __pa((unsigned long)&_end);
417
418 end_paddr = start_paddr + size;
419
420 pg_dir = pgd_offset_k(start_vaddr);
421
422#if PTRS_PER_PMD == 1
423 start_pmd = 0;
424#else
425 start_pmd = ((start_vaddr >> PMD_SHIFT) & (PTRS_PER_PMD - 1));
426#endif
427 start_pte = ((start_vaddr >> PAGE_SHIFT) & (PTRS_PER_PTE - 1));
428
429 address = start_paddr;
430 vaddr = start_vaddr;
431 while (address < end_paddr) {
432#if PTRS_PER_PMD == 1
433 pmd = (pmd_t *)__pa(pg_dir);
434#else
435 pmd = (pmd_t *)pgd_address(*pg_dir);
436
437 /*
438 * pmd is physical at this point
439 */
440
441 if (!pmd) {
442 pmd = (pmd_t *) alloc_bootmem_low_pages_node(NODE_DATA(0), PAGE_SIZE << PMD_ORDER);
443 pmd = (pmd_t *) __pa(pmd);
444 }
445
446 pgd_populate(NULL, pg_dir, __va(pmd));
447#endif
448 pg_dir++;
449
450 /* now change pmd to kernel virtual addresses */
451
452 pmd = (pmd_t *)__va(pmd) + start_pmd;
453 for (tmp1 = start_pmd; tmp1 < PTRS_PER_PMD; tmp1++, pmd++) {
454
455 /*
456 * pg_table is physical at this point
457 */
458
459 pg_table = (pte_t *)pmd_address(*pmd);
460 if (!pg_table) {
461 pg_table = (pte_t *)
462 alloc_bootmem_low_pages_node(NODE_DATA(0), PAGE_SIZE);
463 pg_table = (pte_t *) __pa(pg_table);
464 }
465
466 pmd_populate_kernel(NULL, pmd, __va(pg_table));
467
468 /* now change pg_table to kernel virtual addresses */
469
470 pg_table = (pte_t *) __va(pg_table) + start_pte;
471 for (tmp2 = start_pte; tmp2 < PTRS_PER_PTE; tmp2++, pg_table++) {
472 pte_t pte;
473
474 if (force)
475 pte = __mk_pte(address, pgprot);
476 else if (parisc_text_address(vaddr)) {
477 pte = __mk_pte(address, PAGE_KERNEL_EXEC);
478 if (address >= ro_start && address < kernel_end)
479 pte = pte_mkhuge(pte);
480 }
481 else
482#if defined(CONFIG_PARISC_PAGE_SIZE_4KB)
483 if (address >= ro_start && address < ro_end) {
484 pte = __mk_pte(address, PAGE_KERNEL_EXEC);
485 pte = pte_mkhuge(pte);
486 } else
487#endif
488 {
489 pte = __mk_pte(address, pgprot);
490 if (address >= ro_start && address < kernel_end)
491 pte = pte_mkhuge(pte);
492 }
493
494 if (address >= end_paddr) {
495 if (force)
496 break;
497 else
498 pte_val(pte) = 0;
499 }
500
501 set_pte(pg_table, pte);
502
503 address += PAGE_SIZE;
504 vaddr += PAGE_SIZE;
505 }
506 start_pte = 0;
507
508 if (address >= end_paddr)
509 break;
510 }
511 start_pmd = 0;
512 }
513}
514
515void free_initmem(void)
516{
517 unsigned long init_begin = (unsigned long)__init_begin;
518 unsigned long init_end = (unsigned long)__init_end;
519
520 /* The init text pages are marked R-X. We have to
521 * flush the icache and mark them RW-
522 *
523 * This is tricky, because map_pages is in the init section.
524 * Do a dummy remap of the data section first (the data
525 * section is already PAGE_KERNEL) to pull in the TLB entries
526 * for map_kernel */
527 map_pages(init_begin, __pa(init_begin), init_end - init_begin,
528 PAGE_KERNEL_RWX, 1);
529 /* now remap at PAGE_KERNEL since the TLB is pre-primed to execute
530 * map_pages */
531 map_pages(init_begin, __pa(init_begin), init_end - init_begin,
532 PAGE_KERNEL, 1);
533
534 /* force the kernel to see the new TLB entries */
535 __flush_tlb_range(0, init_begin, init_end);
536
537 /* finally dump all the instructions which were cached, since the
538 * pages are no-longer executable */
539 flush_icache_range(init_begin, init_end);
540
541 free_initmem_default(POISON_FREE_INITMEM);
542
543 /* set up a new led state on systems shipped LED State panel */
544 pdc_chassis_send_status(PDC_CHASSIS_DIRECT_BCOMPLETE);
545}
546
547
548#ifdef CONFIG_DEBUG_RODATA
549void mark_rodata_ro(void)
550{
551 /* rodata memory was already mapped with KERNEL_RO access rights by
552 pagetable_init() and map_pages(). No need to do additional stuff here */
553 printk (KERN_INFO "Write protecting the kernel read-only data: %luk\n",
554 (unsigned long)(__end_rodata - __start_rodata) >> 10);
555}
556#endif
557
558
559/*
560 * Just an arbitrary offset to serve as a "hole" between mapping areas
561 * (between top of physical memory and a potential pcxl dma mapping
562 * area, and below the vmalloc mapping area).
563 *
564 * The current 32K value just means that there will be a 32K "hole"
565 * between mapping areas. That means that any out-of-bounds memory
566 * accesses will hopefully be caught. The vmalloc() routines leaves
567 * a hole of 4kB between each vmalloced area for the same reason.
568 */
569
570 /* Leave room for gateway page expansion */
571#if KERNEL_MAP_START < GATEWAY_PAGE_SIZE
572#error KERNEL_MAP_START is in gateway reserved region
573#endif
574#define MAP_START (KERNEL_MAP_START)
575
576#define VM_MAP_OFFSET (32*1024)
577#define SET_MAP_OFFSET(x) ((void *)(((unsigned long)(x) + VM_MAP_OFFSET) \
578 & ~(VM_MAP_OFFSET-1)))
579
580void *parisc_vmalloc_start __read_mostly;
581EXPORT_SYMBOL(parisc_vmalloc_start);
582
583#ifdef CONFIG_PA11
584unsigned long pcxl_dma_start __read_mostly;
585#endif
586
587void __init mem_init(void)
588{
589 /* Do sanity checks on IPC (compat) structures */
590 BUILD_BUG_ON(sizeof(struct ipc64_perm) != 48);
591#ifndef CONFIG_64BIT
592 BUILD_BUG_ON(sizeof(struct semid64_ds) != 80);
593 BUILD_BUG_ON(sizeof(struct msqid64_ds) != 104);
594 BUILD_BUG_ON(sizeof(struct shmid64_ds) != 104);
595#endif
596#ifdef CONFIG_COMPAT
597 BUILD_BUG_ON(sizeof(struct compat_ipc64_perm) != sizeof(struct ipc64_perm));
598 BUILD_BUG_ON(sizeof(struct compat_semid64_ds) != 80);
599 BUILD_BUG_ON(sizeof(struct compat_msqid64_ds) != 104);
600 BUILD_BUG_ON(sizeof(struct compat_shmid64_ds) != 104);
601#endif
602
603 /* Do sanity checks on page table constants */
604 BUILD_BUG_ON(PTE_ENTRY_SIZE != sizeof(pte_t));
605 BUILD_BUG_ON(PMD_ENTRY_SIZE != sizeof(pmd_t));
606 BUILD_BUG_ON(PGD_ENTRY_SIZE != sizeof(pgd_t));
607 BUILD_BUG_ON(PAGE_SHIFT + BITS_PER_PTE + BITS_PER_PMD + BITS_PER_PGD
608 > BITS_PER_LONG);
609
610 high_memory = __va((max_pfn << PAGE_SHIFT));
611 set_max_mapnr(page_to_pfn(virt_to_page(high_memory - 1)) + 1);
612 free_all_bootmem();
613
614#ifdef CONFIG_PA11
615 if (hppa_dma_ops == &pcxl_dma_ops) {
616 pcxl_dma_start = (unsigned long)SET_MAP_OFFSET(MAP_START);
617 parisc_vmalloc_start = SET_MAP_OFFSET(pcxl_dma_start
618 + PCXL_DMA_MAP_SIZE);
619 } else {
620 pcxl_dma_start = 0;
621 parisc_vmalloc_start = SET_MAP_OFFSET(MAP_START);
622 }
623#else
624 parisc_vmalloc_start = SET_MAP_OFFSET(MAP_START);
625#endif
626
627 mem_init_print_info(NULL);
628#ifdef CONFIG_DEBUG_KERNEL /* double-sanity-check paranoia */
629 printk("virtual kernel memory layout:\n"
630 " vmalloc : 0x%p - 0x%p (%4ld MB)\n"
631 " memory : 0x%p - 0x%p (%4ld MB)\n"
632 " .init : 0x%p - 0x%p (%4ld kB)\n"
633 " .data : 0x%p - 0x%p (%4ld kB)\n"
634 " .text : 0x%p - 0x%p (%4ld kB)\n",
635
636 (void*)VMALLOC_START, (void*)VMALLOC_END,
637 (VMALLOC_END - VMALLOC_START) >> 20,
638
639 __va(0), high_memory,
640 ((unsigned long)high_memory - (unsigned long)__va(0)) >> 20,
641
642 __init_begin, __init_end,
643 ((unsigned long)__init_end - (unsigned long)__init_begin) >> 10,
644
645 _etext, _edata,
646 ((unsigned long)_edata - (unsigned long)_etext) >> 10,
647
648 _text, _etext,
649 ((unsigned long)_etext - (unsigned long)_text) >> 10);
650#endif
651}
652
653unsigned long *empty_zero_page __read_mostly;
654EXPORT_SYMBOL(empty_zero_page);
655
656void show_mem(unsigned int filter)
657{
658 int total = 0,reserved = 0;
659 pg_data_t *pgdat;
660
661 printk(KERN_INFO "Mem-info:\n");
662 show_free_areas(filter);
663
664 for_each_online_pgdat(pgdat) {
665 unsigned long flags;
666 int zoneid;
667
668 pgdat_resize_lock(pgdat, &flags);
669 for (zoneid = 0; zoneid < MAX_NR_ZONES; zoneid++) {
670 struct zone *zone = &pgdat->node_zones[zoneid];
671 if (!populated_zone(zone))
672 continue;
673
674 total += zone->present_pages;
675 reserved = zone->present_pages - zone->managed_pages;
676 }
677 pgdat_resize_unlock(pgdat, &flags);
678 }
679
680 printk(KERN_INFO "%d pages of RAM\n", total);
681 printk(KERN_INFO "%d reserved pages\n", reserved);
682
683#ifdef CONFIG_DISCONTIGMEM
684 {
685 struct zonelist *zl;
686 int i, j;
687
688 for (i = 0; i < npmem_ranges; i++) {
689 zl = node_zonelist(i, 0);
690 for (j = 0; j < MAX_NR_ZONES; j++) {
691 struct zoneref *z;
692 struct zone *zone;
693
694 printk("Zone list for zone %d on node %d: ", j, i);
695 for_each_zone_zonelist(zone, z, zl, j)
696 printk("[%d/%s] ", zone_to_nid(zone),
697 zone->name);
698 printk("\n");
699 }
700 }
701 }
702#endif
703}
704
705/*
706 * pagetable_init() sets up the page tables
707 *
708 * Note that gateway_init() places the Linux gateway page at page 0.
709 * Since gateway pages cannot be dereferenced this has the desirable
710 * side effect of trapping those pesky NULL-reference errors in the
711 * kernel.
712 */
713static void __init pagetable_init(void)
714{
715 int range;
716
717 /* Map each physical memory range to its kernel vaddr */
718
719 for (range = 0; range < npmem_ranges; range++) {
720 unsigned long start_paddr;
721 unsigned long end_paddr;
722 unsigned long size;
723
724 start_paddr = pmem_ranges[range].start_pfn << PAGE_SHIFT;
725 size = pmem_ranges[range].pages << PAGE_SHIFT;
726 end_paddr = start_paddr + size;
727
728 map_pages((unsigned long)__va(start_paddr), start_paddr,
729 size, PAGE_KERNEL, 0);
730 }
731
732#ifdef CONFIG_BLK_DEV_INITRD
733 if (initrd_end && initrd_end > mem_limit) {
734 printk(KERN_INFO "initrd: mapping %08lx-%08lx\n", initrd_start, initrd_end);
735 map_pages(initrd_start, __pa(initrd_start),
736 initrd_end - initrd_start, PAGE_KERNEL, 0);
737 }
738#endif
739
740 empty_zero_page = alloc_bootmem_pages(PAGE_SIZE);
741}
742
743static void __init gateway_init(void)
744{
745 unsigned long linux_gateway_page_addr;
746 /* FIXME: This is 'const' in order to trick the compiler
747 into not treating it as DP-relative data. */
748 extern void * const linux_gateway_page;
749
750 linux_gateway_page_addr = LINUX_GATEWAY_ADDR & PAGE_MASK;
751
752 /*
753 * Setup Linux Gateway page.
754 *
755 * The Linux gateway page will reside in kernel space (on virtual
756 * page 0), so it doesn't need to be aliased into user space.
757 */
758
759 map_pages(linux_gateway_page_addr, __pa(&linux_gateway_page),
760 PAGE_SIZE, PAGE_GATEWAY, 1);
761}
762
763void __init paging_init(void)
764{
765 int i;
766
767 setup_bootmem();
768 pagetable_init();
769 gateway_init();
770 flush_cache_all_local(); /* start with known state */
771 flush_tlb_all_local(NULL);
772
773 for (i = 0; i < npmem_ranges; i++) {
774 unsigned long zones_size[MAX_NR_ZONES] = { 0, };
775
776 zones_size[ZONE_NORMAL] = pmem_ranges[i].pages;
777
778#ifdef CONFIG_DISCONTIGMEM
779 /* Need to initialize the pfnnid_map before we can initialize
780 the zone */
781 {
782 int j;
783 for (j = (pmem_ranges[i].start_pfn >> PFNNID_SHIFT);
784 j <= ((pmem_ranges[i].start_pfn + pmem_ranges[i].pages) >> PFNNID_SHIFT);
785 j++) {
786 pfnnid_map[j] = i;
787 }
788 }
789#endif
790
791 free_area_init_node(i, zones_size,
792 pmem_ranges[i].start_pfn, NULL);
793 }
794}
795
796#ifdef CONFIG_PA20
797
798/*
799 * Currently, all PA20 chips have 18 bit protection IDs, which is the
800 * limiting factor (space ids are 32 bits).
801 */
802
803#define NR_SPACE_IDS 262144
804
805#else
806
807/*
808 * Currently we have a one-to-one relationship between space IDs and
809 * protection IDs. Older parisc chips (PCXS, PCXT, PCXL, PCXL2) only
810 * support 15 bit protection IDs, so that is the limiting factor.
811 * PCXT' has 18 bit protection IDs, but only 16 bit spaceids, so it's
812 * probably not worth the effort for a special case here.
813 */
814
815#define NR_SPACE_IDS 32768
816
817#endif /* !CONFIG_PA20 */
818
819#define RECYCLE_THRESHOLD (NR_SPACE_IDS / 2)
820#define SID_ARRAY_SIZE (NR_SPACE_IDS / (8 * sizeof(long)))
821
822static unsigned long space_id[SID_ARRAY_SIZE] = { 1 }; /* disallow space 0 */
823static unsigned long dirty_space_id[SID_ARRAY_SIZE];
824static unsigned long space_id_index;
825static unsigned long free_space_ids = NR_SPACE_IDS - 1;
826static unsigned long dirty_space_ids = 0;
827
828static DEFINE_SPINLOCK(sid_lock);
829
830unsigned long alloc_sid(void)
831{
832 unsigned long index;
833
834 spin_lock(&sid_lock);
835
836 if (free_space_ids == 0) {
837 if (dirty_space_ids != 0) {
838 spin_unlock(&sid_lock);
839 flush_tlb_all(); /* flush_tlb_all() calls recycle_sids() */
840 spin_lock(&sid_lock);
841 }
842 BUG_ON(free_space_ids == 0);
843 }
844
845 free_space_ids--;
846
847 index = find_next_zero_bit(space_id, NR_SPACE_IDS, space_id_index);
848 space_id[index >> SHIFT_PER_LONG] |= (1L << (index & (BITS_PER_LONG - 1)));
849 space_id_index = index;
850
851 spin_unlock(&sid_lock);
852
853 return index << SPACEID_SHIFT;
854}
855
856void free_sid(unsigned long spaceid)
857{
858 unsigned long index = spaceid >> SPACEID_SHIFT;
859 unsigned long *dirty_space_offset;
860
861 dirty_space_offset = dirty_space_id + (index >> SHIFT_PER_LONG);
862 index &= (BITS_PER_LONG - 1);
863
864 spin_lock(&sid_lock);
865
866 BUG_ON(*dirty_space_offset & (1L << index)); /* attempt to free space id twice */
867
868 *dirty_space_offset |= (1L << index);
869 dirty_space_ids++;
870
871 spin_unlock(&sid_lock);
872}
873
874
875#ifdef CONFIG_SMP
876static void get_dirty_sids(unsigned long *ndirtyptr,unsigned long *dirty_array)
877{
878 int i;
879
880 /* NOTE: sid_lock must be held upon entry */
881
882 *ndirtyptr = dirty_space_ids;
883 if (dirty_space_ids != 0) {
884 for (i = 0; i < SID_ARRAY_SIZE; i++) {
885 dirty_array[i] = dirty_space_id[i];
886 dirty_space_id[i] = 0;
887 }
888 dirty_space_ids = 0;
889 }
890
891 return;
892}
893
894static void recycle_sids(unsigned long ndirty,unsigned long *dirty_array)
895{
896 int i;
897
898 /* NOTE: sid_lock must be held upon entry */
899
900 if (ndirty != 0) {
901 for (i = 0; i < SID_ARRAY_SIZE; i++) {
902 space_id[i] ^= dirty_array[i];
903 }
904
905 free_space_ids += ndirty;
906 space_id_index = 0;
907 }
908}
909
910#else /* CONFIG_SMP */
911
912static void recycle_sids(void)
913{
914 int i;
915
916 /* NOTE: sid_lock must be held upon entry */
917
918 if (dirty_space_ids != 0) {
919 for (i = 0; i < SID_ARRAY_SIZE; i++) {
920 space_id[i] ^= dirty_space_id[i];
921 dirty_space_id[i] = 0;
922 }
923
924 free_space_ids += dirty_space_ids;
925 dirty_space_ids = 0;
926 space_id_index = 0;
927 }
928}
929#endif
930
931/*
932 * flush_tlb_all() calls recycle_sids(), since whenever the entire tlb is
933 * purged, we can safely reuse the space ids that were released but
934 * not flushed from the tlb.
935 */
936
937#ifdef CONFIG_SMP
938
939static unsigned long recycle_ndirty;
940static unsigned long recycle_dirty_array[SID_ARRAY_SIZE];
941static unsigned int recycle_inuse;
942
943void flush_tlb_all(void)
944{
945 int do_recycle;
946
947 __inc_irq_stat(irq_tlb_count);
948 do_recycle = 0;
949 spin_lock(&sid_lock);
950 if (dirty_space_ids > RECYCLE_THRESHOLD) {
951 BUG_ON(recycle_inuse); /* FIXME: Use a semaphore/wait queue here */
952 get_dirty_sids(&recycle_ndirty,recycle_dirty_array);
953 recycle_inuse++;
954 do_recycle++;
955 }
956 spin_unlock(&sid_lock);
957 on_each_cpu(flush_tlb_all_local, NULL, 1);
958 if (do_recycle) {
959 spin_lock(&sid_lock);
960 recycle_sids(recycle_ndirty,recycle_dirty_array);
961 recycle_inuse = 0;
962 spin_unlock(&sid_lock);
963 }
964}
965#else
966void flush_tlb_all(void)
967{
968 __inc_irq_stat(irq_tlb_count);
969 spin_lock(&sid_lock);
970 flush_tlb_all_local(NULL);
971 recycle_sids();
972 spin_unlock(&sid_lock);
973}
974#endif
975
976#ifdef CONFIG_BLK_DEV_INITRD
977void free_initrd_mem(unsigned long start, unsigned long end)
978{
979 free_reserved_area((void *)start, (void *)end, -1, "initrd");
980}
981#endif
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * linux/arch/parisc/mm/init.c
4 *
5 * Copyright (C) 1995 Linus Torvalds
6 * Copyright 1999 SuSE GmbH
7 * changed by Philipp Rumpf
8 * Copyright 1999 Philipp Rumpf (prumpf@tux.org)
9 * Copyright 2004 Randolph Chung (tausq@debian.org)
10 * Copyright 2006-2007 Helge Deller (deller@gmx.de)
11 *
12 */
13
14
15#include <linux/module.h>
16#include <linux/mm.h>
17#include <linux/memblock.h>
18#include <linux/gfp.h>
19#include <linux/delay.h>
20#include <linux/init.h>
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 */
26#include <linux/compat.h>
27
28#include <asm/pgalloc.h>
29#include <asm/tlb.h>
30#include <asm/pdc_chassis.h>
31#include <asm/mmzone.h>
32#include <asm/sections.h>
33#include <asm/msgbuf.h>
34#include <asm/sparsemem.h>
35
36extern int data_start;
37extern void parisc_kernel_start(void); /* Kernel entry point in head.S */
38
39#if CONFIG_PGTABLE_LEVELS == 3
40pmd_t pmd0[PTRS_PER_PMD] __section(".data..vm0.pmd") __attribute__ ((aligned(PAGE_SIZE)));
41#endif
42
43pgd_t swapper_pg_dir[PTRS_PER_PGD] __section(".data..vm0.pgd") __attribute__ ((aligned(PAGE_SIZE)));
44pte_t pg0[PT_INITIAL * PTRS_PER_PTE] __section(".data..vm0.pte") __attribute__ ((aligned(PAGE_SIZE)));
45
46static struct resource data_resource = {
47 .name = "Kernel data",
48 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
49};
50
51static struct resource code_resource = {
52 .name = "Kernel code",
53 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
54};
55
56static struct resource pdcdata_resource = {
57 .name = "PDC data (Page Zero)",
58 .start = 0,
59 .end = 0x9ff,
60 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
61};
62
63static struct resource sysram_resources[MAX_PHYSMEM_RANGES] __ro_after_init;
64
65/* The following array is initialized from the firmware specific
66 * information retrieved in kernel/inventory.c.
67 */
68
69physmem_range_t pmem_ranges[MAX_PHYSMEM_RANGES] __initdata;
70int npmem_ranges __initdata;
71
72#ifdef CONFIG_64BIT
73#define MAX_MEM (1UL << MAX_PHYSMEM_BITS)
74#else /* !CONFIG_64BIT */
75#define MAX_MEM (3584U*1024U*1024U)
76#endif /* !CONFIG_64BIT */
77
78static unsigned long mem_limit __read_mostly = MAX_MEM;
79
80static void __init mem_limit_func(void)
81{
82 char *cp, *end;
83 unsigned long limit;
84
85 /* We need this before __setup() functions are called */
86
87 limit = MAX_MEM;
88 for (cp = boot_command_line; *cp; ) {
89 if (memcmp(cp, "mem=", 4) == 0) {
90 cp += 4;
91 limit = memparse(cp, &end);
92 if (end != cp)
93 break;
94 cp = end;
95 } else {
96 while (*cp != ' ' && *cp)
97 ++cp;
98 while (*cp == ' ')
99 ++cp;
100 }
101 }
102
103 if (limit < mem_limit)
104 mem_limit = limit;
105}
106
107#define MAX_GAP (0x40000000UL >> PAGE_SHIFT)
108
109static void __init setup_bootmem(void)
110{
111 unsigned long mem_max;
112#ifndef CONFIG_SPARSEMEM
113 physmem_range_t pmem_holes[MAX_PHYSMEM_RANGES - 1];
114 int npmem_holes;
115#endif
116 int i, sysram_resource_count;
117
118 disable_sr_hashing(); /* Turn off space register hashing */
119
120 /*
121 * Sort the ranges. Since the number of ranges is typically
122 * small, and performance is not an issue here, just do
123 * a simple insertion sort.
124 */
125
126 for (i = 1; i < npmem_ranges; i++) {
127 int j;
128
129 for (j = i; j > 0; j--) {
130 if (pmem_ranges[j-1].start_pfn <
131 pmem_ranges[j].start_pfn) {
132
133 break;
134 }
135 swap(pmem_ranges[j-1], pmem_ranges[j]);
136 }
137 }
138
139#ifndef CONFIG_SPARSEMEM
140 /*
141 * Throw out ranges that are too far apart (controlled by
142 * MAX_GAP).
143 */
144
145 for (i = 1; i < npmem_ranges; i++) {
146 if (pmem_ranges[i].start_pfn -
147 (pmem_ranges[i-1].start_pfn +
148 pmem_ranges[i-1].pages) > MAX_GAP) {
149 npmem_ranges = i;
150 printk("Large gap in memory detected (%ld pages). "
151 "Consider turning on CONFIG_SPARSEMEM\n",
152 pmem_ranges[i].start_pfn -
153 (pmem_ranges[i-1].start_pfn +
154 pmem_ranges[i-1].pages));
155 break;
156 }
157 }
158#endif
159
160 /* Print the memory ranges */
161 pr_info("Memory Ranges:\n");
162
163 for (i = 0; i < npmem_ranges; i++) {
164 struct resource *res = &sysram_resources[i];
165 unsigned long start;
166 unsigned long size;
167
168 size = (pmem_ranges[i].pages << PAGE_SHIFT);
169 start = (pmem_ranges[i].start_pfn << PAGE_SHIFT);
170 pr_info("%2d) Start 0x%016lx End 0x%016lx Size %6ld MB\n",
171 i, start, start + (size - 1), size >> 20);
172
173 /* request memory resource */
174 res->name = "System RAM";
175 res->start = start;
176 res->end = start + size - 1;
177 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
178 request_resource(&iomem_resource, res);
179 }
180
181 sysram_resource_count = npmem_ranges;
182
183 /*
184 * For 32 bit kernels we limit the amount of memory we can
185 * support, in order to preserve enough kernel address space
186 * for other purposes. For 64 bit kernels we don't normally
187 * limit the memory, but this mechanism can be used to
188 * artificially limit the amount of memory (and it is written
189 * to work with multiple memory ranges).
190 */
191
192 mem_limit_func(); /* check for "mem=" argument */
193
194 mem_max = 0;
195 for (i = 0; i < npmem_ranges; i++) {
196 unsigned long rsize;
197
198 rsize = pmem_ranges[i].pages << PAGE_SHIFT;
199 if ((mem_max + rsize) > mem_limit) {
200 printk(KERN_WARNING "Memory truncated to %ld MB\n", mem_limit >> 20);
201 if (mem_max == mem_limit)
202 npmem_ranges = i;
203 else {
204 pmem_ranges[i].pages = (mem_limit >> PAGE_SHIFT)
205 - (mem_max >> PAGE_SHIFT);
206 npmem_ranges = i + 1;
207 mem_max = mem_limit;
208 }
209 break;
210 }
211 mem_max += rsize;
212 }
213
214 printk(KERN_INFO "Total Memory: %ld MB\n",mem_max >> 20);
215
216#ifndef CONFIG_SPARSEMEM
217 /* Merge the ranges, keeping track of the holes */
218 {
219 unsigned long end_pfn;
220 unsigned long hole_pages;
221
222 npmem_holes = 0;
223 end_pfn = pmem_ranges[0].start_pfn + pmem_ranges[0].pages;
224 for (i = 1; i < npmem_ranges; i++) {
225
226 hole_pages = pmem_ranges[i].start_pfn - end_pfn;
227 if (hole_pages) {
228 pmem_holes[npmem_holes].start_pfn = end_pfn;
229 pmem_holes[npmem_holes++].pages = hole_pages;
230 end_pfn += hole_pages;
231 }
232 end_pfn += pmem_ranges[i].pages;
233 }
234
235 pmem_ranges[0].pages = end_pfn - pmem_ranges[0].start_pfn;
236 npmem_ranges = 1;
237 }
238#endif
239
240 /*
241 * Initialize and free the full range of memory in each range.
242 */
243
244 max_pfn = 0;
245 for (i = 0; i < npmem_ranges; i++) {
246 unsigned long start_pfn;
247 unsigned long npages;
248 unsigned long start;
249 unsigned long size;
250
251 start_pfn = pmem_ranges[i].start_pfn;
252 npages = pmem_ranges[i].pages;
253
254 start = start_pfn << PAGE_SHIFT;
255 size = npages << PAGE_SHIFT;
256
257 /* add system RAM memblock */
258 memblock_add(start, size);
259
260 if ((start_pfn + npages) > max_pfn)
261 max_pfn = start_pfn + npages;
262 }
263
264 /*
265 * We can't use memblock top-down allocations because we only
266 * created the initial mapping up to KERNEL_INITIAL_SIZE in
267 * the assembly bootup code.
268 */
269 memblock_set_bottom_up(true);
270
271 /* IOMMU is always used to access "high mem" on those boxes
272 * that can support enough mem that a PCI device couldn't
273 * directly DMA to any physical addresses.
274 * ISA DMA support will need to revisit this.
275 */
276 max_low_pfn = max_pfn;
277
278 /* reserve PAGE0 pdc memory, kernel text/data/bss & bootmap */
279
280#define PDC_CONSOLE_IO_IODC_SIZE 32768
281
282 memblock_reserve(0UL, (unsigned long)(PAGE0->mem_free +
283 PDC_CONSOLE_IO_IODC_SIZE));
284 memblock_reserve(__pa(KERNEL_BINARY_TEXT_START),
285 (unsigned long)(_end - KERNEL_BINARY_TEXT_START));
286
287#ifndef CONFIG_SPARSEMEM
288
289 /* reserve the holes */
290
291 for (i = 0; i < npmem_holes; i++) {
292 memblock_reserve((pmem_holes[i].start_pfn << PAGE_SHIFT),
293 (pmem_holes[i].pages << PAGE_SHIFT));
294 }
295#endif
296
297#ifdef CONFIG_BLK_DEV_INITRD
298 if (initrd_start) {
299 printk(KERN_INFO "initrd: %08lx-%08lx\n", initrd_start, initrd_end);
300 if (__pa(initrd_start) < mem_max) {
301 unsigned long initrd_reserve;
302
303 if (__pa(initrd_end) > mem_max) {
304 initrd_reserve = mem_max - __pa(initrd_start);
305 } else {
306 initrd_reserve = initrd_end - initrd_start;
307 }
308 initrd_below_start_ok = 1;
309 printk(KERN_INFO "initrd: reserving %08lx-%08lx (mem_max %08lx)\n", __pa(initrd_start), __pa(initrd_start) + initrd_reserve, mem_max);
310
311 memblock_reserve(__pa(initrd_start), initrd_reserve);
312 }
313 }
314#endif
315
316 data_resource.start = virt_to_phys(&data_start);
317 data_resource.end = virt_to_phys(_end) - 1;
318 code_resource.start = virt_to_phys(_text);
319 code_resource.end = virt_to_phys(&data_start)-1;
320
321 /* We don't know which region the kernel will be in, so try
322 * all of them.
323 */
324 for (i = 0; i < sysram_resource_count; i++) {
325 struct resource *res = &sysram_resources[i];
326 request_resource(res, &code_resource);
327 request_resource(res, &data_resource);
328 }
329 request_resource(&sysram_resources[0], &pdcdata_resource);
330
331 /* Initialize Page Deallocation Table (PDT) and check for bad memory. */
332 pdc_pdt_init();
333
334 memblock_allow_resize();
335 memblock_dump_all();
336}
337
338static bool kernel_set_to_readonly;
339
340static void __ref map_pages(unsigned long start_vaddr,
341 unsigned long start_paddr, unsigned long size,
342 pgprot_t pgprot, int force)
343{
344 pmd_t *pmd;
345 pte_t *pg_table;
346 unsigned long end_paddr;
347 unsigned long start_pmd;
348 unsigned long start_pte;
349 unsigned long tmp1;
350 unsigned long tmp2;
351 unsigned long address;
352 unsigned long vaddr;
353 unsigned long ro_start;
354 unsigned long ro_end;
355 unsigned long kernel_start, kernel_end;
356
357 ro_start = __pa((unsigned long)_text);
358 ro_end = __pa((unsigned long)&data_start);
359 kernel_start = __pa((unsigned long)&__init_begin);
360 kernel_end = __pa((unsigned long)&_end);
361
362 end_paddr = start_paddr + size;
363
364 /* for 2-level configuration PTRS_PER_PMD is 0 so start_pmd will be 0 */
365 start_pmd = ((start_vaddr >> PMD_SHIFT) & (PTRS_PER_PMD - 1));
366 start_pte = ((start_vaddr >> PAGE_SHIFT) & (PTRS_PER_PTE - 1));
367
368 address = start_paddr;
369 vaddr = start_vaddr;
370 while (address < end_paddr) {
371 pgd_t *pgd = pgd_offset_k(vaddr);
372 p4d_t *p4d = p4d_offset(pgd, vaddr);
373 pud_t *pud = pud_offset(p4d, vaddr);
374
375#if CONFIG_PGTABLE_LEVELS == 3
376 if (pud_none(*pud)) {
377 pmd = memblock_alloc(PAGE_SIZE << PMD_TABLE_ORDER,
378 PAGE_SIZE << PMD_TABLE_ORDER);
379 if (!pmd)
380 panic("pmd allocation failed.\n");
381 pud_populate(NULL, pud, pmd);
382 }
383#endif
384
385 pmd = pmd_offset(pud, vaddr);
386 for (tmp1 = start_pmd; tmp1 < PTRS_PER_PMD; tmp1++, pmd++) {
387 if (pmd_none(*pmd)) {
388 pg_table = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
389 if (!pg_table)
390 panic("page table allocation failed\n");
391 pmd_populate_kernel(NULL, pmd, pg_table);
392 }
393
394 pg_table = pte_offset_kernel(pmd, vaddr);
395 for (tmp2 = start_pte; tmp2 < PTRS_PER_PTE; tmp2++, pg_table++) {
396 pte_t pte;
397 pgprot_t prot;
398 bool huge = false;
399
400 if (force) {
401 prot = pgprot;
402 } else if (address < kernel_start || address >= kernel_end) {
403 /* outside kernel memory */
404 prot = PAGE_KERNEL;
405 } else if (!kernel_set_to_readonly) {
406 /* still initializing, allow writing to RO memory */
407 prot = PAGE_KERNEL_RWX;
408 huge = true;
409 } else if (address >= ro_start) {
410 /* Code (ro) and Data areas */
411 prot = (address < ro_end) ?
412 PAGE_KERNEL_EXEC : PAGE_KERNEL;
413 huge = true;
414 } else {
415 prot = PAGE_KERNEL;
416 }
417
418 pte = __mk_pte(address, prot);
419 if (huge)
420 pte = pte_mkhuge(pte);
421
422 if (address >= end_paddr)
423 break;
424
425 set_pte(pg_table, pte);
426
427 address += PAGE_SIZE;
428 vaddr += PAGE_SIZE;
429 }
430 start_pte = 0;
431
432 if (address >= end_paddr)
433 break;
434 }
435 start_pmd = 0;
436 }
437}
438
439void __init set_kernel_text_rw(int enable_read_write)
440{
441 unsigned long start = (unsigned long) __init_begin;
442 unsigned long end = (unsigned long) &data_start;
443
444 map_pages(start, __pa(start), end-start,
445 PAGE_KERNEL_RWX, enable_read_write ? 1:0);
446
447 /* force the kernel to see the new page table entries */
448 flush_cache_all();
449 flush_tlb_all();
450}
451
452void free_initmem(void)
453{
454 unsigned long init_begin = (unsigned long)__init_begin;
455 unsigned long init_end = (unsigned long)__init_end;
456 unsigned long kernel_end = (unsigned long)&_end;
457
458 /* Remap kernel text and data, but do not touch init section yet. */
459 kernel_set_to_readonly = true;
460 map_pages(init_end, __pa(init_end), kernel_end - init_end,
461 PAGE_KERNEL, 0);
462
463 /* The init text pages are marked R-X. We have to
464 * flush the icache and mark them RW-
465 *
466 * Do a dummy remap of the data section first (the data
467 * section is already PAGE_KERNEL) to pull in the TLB entries
468 * for map_kernel */
469 map_pages(init_begin, __pa(init_begin), init_end - init_begin,
470 PAGE_KERNEL_RWX, 1);
471 /* now remap at PAGE_KERNEL since the TLB is pre-primed to execute
472 * map_pages */
473 map_pages(init_begin, __pa(init_begin), init_end - init_begin,
474 PAGE_KERNEL, 1);
475
476 /* force the kernel to see the new TLB entries */
477 __flush_tlb_range(0, init_begin, kernel_end);
478
479 /* finally dump all the instructions which were cached, since the
480 * pages are no-longer executable */
481 flush_icache_range(init_begin, init_end);
482
483 free_initmem_default(POISON_FREE_INITMEM);
484
485 /* set up a new led state on systems shipped LED State panel */
486 pdc_chassis_send_status(PDC_CHASSIS_DIRECT_BCOMPLETE);
487}
488
489
490#ifdef CONFIG_STRICT_KERNEL_RWX
491void mark_rodata_ro(void)
492{
493 /* rodata memory was already mapped with KERNEL_RO access rights by
494 pagetable_init() and map_pages(). No need to do additional stuff here */
495 unsigned long roai_size = __end_ro_after_init - __start_ro_after_init;
496
497 pr_info("Write protected read-only-after-init data: %luk\n", roai_size >> 10);
498}
499#endif
500
501
502/*
503 * Just an arbitrary offset to serve as a "hole" between mapping areas
504 * (between top of physical memory and a potential pcxl dma mapping
505 * area, and below the vmalloc mapping area).
506 *
507 * The current 32K value just means that there will be a 32K "hole"
508 * between mapping areas. That means that any out-of-bounds memory
509 * accesses will hopefully be caught. The vmalloc() routines leaves
510 * a hole of 4kB between each vmalloced area for the same reason.
511 */
512
513 /* Leave room for gateway page expansion */
514#if KERNEL_MAP_START < GATEWAY_PAGE_SIZE
515#error KERNEL_MAP_START is in gateway reserved region
516#endif
517#define MAP_START (KERNEL_MAP_START)
518
519#define VM_MAP_OFFSET (32*1024)
520#define SET_MAP_OFFSET(x) ((void *)(((unsigned long)(x) + VM_MAP_OFFSET) \
521 & ~(VM_MAP_OFFSET-1)))
522
523void *parisc_vmalloc_start __ro_after_init;
524EXPORT_SYMBOL(parisc_vmalloc_start);
525
526#ifdef CONFIG_PA11
527unsigned long pcxl_dma_start __ro_after_init;
528#endif
529
530void __init mem_init(void)
531{
532 /* Do sanity checks on IPC (compat) structures */
533 BUILD_BUG_ON(sizeof(struct ipc64_perm) != 48);
534#ifndef CONFIG_64BIT
535 BUILD_BUG_ON(sizeof(struct semid64_ds) != 80);
536 BUILD_BUG_ON(sizeof(struct msqid64_ds) != 104);
537 BUILD_BUG_ON(sizeof(struct shmid64_ds) != 104);
538#endif
539#ifdef CONFIG_COMPAT
540 BUILD_BUG_ON(sizeof(struct compat_ipc64_perm) != sizeof(struct ipc64_perm));
541 BUILD_BUG_ON(sizeof(struct compat_semid64_ds) != 80);
542 BUILD_BUG_ON(sizeof(struct compat_msqid64_ds) != 104);
543 BUILD_BUG_ON(sizeof(struct compat_shmid64_ds) != 104);
544#endif
545
546 /* Do sanity checks on page table constants */
547 BUILD_BUG_ON(PTE_ENTRY_SIZE != sizeof(pte_t));
548 BUILD_BUG_ON(PMD_ENTRY_SIZE != sizeof(pmd_t));
549 BUILD_BUG_ON(PGD_ENTRY_SIZE != sizeof(pgd_t));
550 BUILD_BUG_ON(PAGE_SHIFT + BITS_PER_PTE + BITS_PER_PMD + BITS_PER_PGD
551 > BITS_PER_LONG);
552#if CONFIG_PGTABLE_LEVELS == 3
553 BUILD_BUG_ON(PT_INITIAL > PTRS_PER_PMD);
554#else
555 BUILD_BUG_ON(PT_INITIAL > PTRS_PER_PGD);
556#endif
557
558#ifdef CONFIG_64BIT
559 /* avoid ldil_%L() asm statements to sign-extend into upper 32-bits */
560 BUILD_BUG_ON(__PAGE_OFFSET >= 0x80000000);
561 BUILD_BUG_ON(TMPALIAS_MAP_START >= 0x80000000);
562#endif
563
564 high_memory = __va((max_pfn << PAGE_SHIFT));
565 set_max_mapnr(max_low_pfn);
566 memblock_free_all();
567
568#ifdef CONFIG_PA11
569 if (boot_cpu_data.cpu_type == pcxl2 || boot_cpu_data.cpu_type == pcxl) {
570 pcxl_dma_start = (unsigned long)SET_MAP_OFFSET(MAP_START);
571 parisc_vmalloc_start = SET_MAP_OFFSET(pcxl_dma_start
572 + PCXL_DMA_MAP_SIZE);
573 } else
574#endif
575 parisc_vmalloc_start = SET_MAP_OFFSET(MAP_START);
576
577#if 0
578 /*
579 * Do not expose the virtual kernel memory layout to userspace.
580 * But keep code for debugging purposes.
581 */
582 printk("virtual kernel memory layout:\n"
583 " vmalloc : 0x%px - 0x%px (%4ld MB)\n"
584 " fixmap : 0x%px - 0x%px (%4ld kB)\n"
585 " memory : 0x%px - 0x%px (%4ld MB)\n"
586 " .init : 0x%px - 0x%px (%4ld kB)\n"
587 " .data : 0x%px - 0x%px (%4ld kB)\n"
588 " .text : 0x%px - 0x%px (%4ld kB)\n",
589
590 (void*)VMALLOC_START, (void*)VMALLOC_END,
591 (VMALLOC_END - VMALLOC_START) >> 20,
592
593 (void *)FIXMAP_START, (void *)(FIXMAP_START + FIXMAP_SIZE),
594 (unsigned long)(FIXMAP_SIZE / 1024),
595
596 __va(0), high_memory,
597 ((unsigned long)high_memory - (unsigned long)__va(0)) >> 20,
598
599 __init_begin, __init_end,
600 ((unsigned long)__init_end - (unsigned long)__init_begin) >> 10,
601
602 _etext, _edata,
603 ((unsigned long)_edata - (unsigned long)_etext) >> 10,
604
605 _text, _etext,
606 ((unsigned long)_etext - (unsigned long)_text) >> 10);
607#endif
608}
609
610unsigned long *empty_zero_page __ro_after_init;
611EXPORT_SYMBOL(empty_zero_page);
612
613/*
614 * pagetable_init() sets up the page tables
615 *
616 * Note that gateway_init() places the Linux gateway page at page 0.
617 * Since gateway pages cannot be dereferenced this has the desirable
618 * side effect of trapping those pesky NULL-reference errors in the
619 * kernel.
620 */
621static void __init pagetable_init(void)
622{
623 int range;
624
625 /* Map each physical memory range to its kernel vaddr */
626
627 for (range = 0; range < npmem_ranges; range++) {
628 unsigned long start_paddr;
629 unsigned long end_paddr;
630 unsigned long size;
631
632 start_paddr = pmem_ranges[range].start_pfn << PAGE_SHIFT;
633 size = pmem_ranges[range].pages << PAGE_SHIFT;
634 end_paddr = start_paddr + size;
635
636 map_pages((unsigned long)__va(start_paddr), start_paddr,
637 size, PAGE_KERNEL, 0);
638 }
639
640#ifdef CONFIG_BLK_DEV_INITRD
641 if (initrd_end && initrd_end > mem_limit) {
642 printk(KERN_INFO "initrd: mapping %08lx-%08lx\n", initrd_start, initrd_end);
643 map_pages(initrd_start, __pa(initrd_start),
644 initrd_end - initrd_start, PAGE_KERNEL, 0);
645 }
646#endif
647
648 empty_zero_page = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
649 if (!empty_zero_page)
650 panic("zero page allocation failed.\n");
651
652}
653
654static void __init gateway_init(void)
655{
656 unsigned long linux_gateway_page_addr;
657 /* FIXME: This is 'const' in order to trick the compiler
658 into not treating it as DP-relative data. */
659 extern void * const linux_gateway_page;
660
661 linux_gateway_page_addr = LINUX_GATEWAY_ADDR & PAGE_MASK;
662
663 /*
664 * Setup Linux Gateway page.
665 *
666 * The Linux gateway page will reside in kernel space (on virtual
667 * page 0), so it doesn't need to be aliased into user space.
668 */
669
670 map_pages(linux_gateway_page_addr, __pa(&linux_gateway_page),
671 PAGE_SIZE, PAGE_GATEWAY, 1);
672}
673
674static void __init parisc_bootmem_free(void)
675{
676 unsigned long max_zone_pfn[MAX_NR_ZONES] = { 0, };
677
678 max_zone_pfn[0] = memblock_end_of_DRAM();
679
680 free_area_init(max_zone_pfn);
681}
682
683void __init paging_init(void)
684{
685 setup_bootmem();
686 pagetable_init();
687 gateway_init();
688 flush_cache_all_local(); /* start with known state */
689 flush_tlb_all_local(NULL);
690
691 sparse_init();
692 parisc_bootmem_free();
693}
694
695#ifdef CONFIG_PA20
696
697/*
698 * Currently, all PA20 chips have 18 bit protection IDs, which is the
699 * limiting factor (space ids are 32 bits).
700 */
701
702#define NR_SPACE_IDS 262144
703
704#else
705
706/*
707 * Currently we have a one-to-one relationship between space IDs and
708 * protection IDs. Older parisc chips (PCXS, PCXT, PCXL, PCXL2) only
709 * support 15 bit protection IDs, so that is the limiting factor.
710 * PCXT' has 18 bit protection IDs, but only 16 bit spaceids, so it's
711 * probably not worth the effort for a special case here.
712 */
713
714#define NR_SPACE_IDS 32768
715
716#endif /* !CONFIG_PA20 */
717
718#define RECYCLE_THRESHOLD (NR_SPACE_IDS / 2)
719#define SID_ARRAY_SIZE (NR_SPACE_IDS / (8 * sizeof(long)))
720
721static unsigned long space_id[SID_ARRAY_SIZE] = { 1 }; /* disallow space 0 */
722static unsigned long dirty_space_id[SID_ARRAY_SIZE];
723static unsigned long space_id_index;
724static unsigned long free_space_ids = NR_SPACE_IDS - 1;
725static unsigned long dirty_space_ids;
726
727static DEFINE_SPINLOCK(sid_lock);
728
729unsigned long alloc_sid(void)
730{
731 unsigned long index;
732
733 spin_lock(&sid_lock);
734
735 if (free_space_ids == 0) {
736 if (dirty_space_ids != 0) {
737 spin_unlock(&sid_lock);
738 flush_tlb_all(); /* flush_tlb_all() calls recycle_sids() */
739 spin_lock(&sid_lock);
740 }
741 BUG_ON(free_space_ids == 0);
742 }
743
744 free_space_ids--;
745
746 index = find_next_zero_bit(space_id, NR_SPACE_IDS, space_id_index);
747 space_id[BIT_WORD(index)] |= BIT_MASK(index);
748 space_id_index = index;
749
750 spin_unlock(&sid_lock);
751
752 return index << SPACEID_SHIFT;
753}
754
755void free_sid(unsigned long spaceid)
756{
757 unsigned long index = spaceid >> SPACEID_SHIFT;
758 unsigned long *dirty_space_offset, mask;
759
760 dirty_space_offset = &dirty_space_id[BIT_WORD(index)];
761 mask = BIT_MASK(index);
762
763 spin_lock(&sid_lock);
764
765 BUG_ON(*dirty_space_offset & mask); /* attempt to free space id twice */
766
767 *dirty_space_offset |= mask;
768 dirty_space_ids++;
769
770 spin_unlock(&sid_lock);
771}
772
773
774#ifdef CONFIG_SMP
775static void get_dirty_sids(unsigned long *ndirtyptr,unsigned long *dirty_array)
776{
777 int i;
778
779 /* NOTE: sid_lock must be held upon entry */
780
781 *ndirtyptr = dirty_space_ids;
782 if (dirty_space_ids != 0) {
783 for (i = 0; i < SID_ARRAY_SIZE; i++) {
784 dirty_array[i] = dirty_space_id[i];
785 dirty_space_id[i] = 0;
786 }
787 dirty_space_ids = 0;
788 }
789
790 return;
791}
792
793static void recycle_sids(unsigned long ndirty,unsigned long *dirty_array)
794{
795 int i;
796
797 /* NOTE: sid_lock must be held upon entry */
798
799 if (ndirty != 0) {
800 for (i = 0; i < SID_ARRAY_SIZE; i++) {
801 space_id[i] ^= dirty_array[i];
802 }
803
804 free_space_ids += ndirty;
805 space_id_index = 0;
806 }
807}
808
809#else /* CONFIG_SMP */
810
811static void recycle_sids(void)
812{
813 int i;
814
815 /* NOTE: sid_lock must be held upon entry */
816
817 if (dirty_space_ids != 0) {
818 for (i = 0; i < SID_ARRAY_SIZE; i++) {
819 space_id[i] ^= dirty_space_id[i];
820 dirty_space_id[i] = 0;
821 }
822
823 free_space_ids += dirty_space_ids;
824 dirty_space_ids = 0;
825 space_id_index = 0;
826 }
827}
828#endif
829
830/*
831 * flush_tlb_all() calls recycle_sids(), since whenever the entire tlb is
832 * purged, we can safely reuse the space ids that were released but
833 * not flushed from the tlb.
834 */
835
836#ifdef CONFIG_SMP
837
838static unsigned long recycle_ndirty;
839static unsigned long recycle_dirty_array[SID_ARRAY_SIZE];
840static unsigned int recycle_inuse;
841
842void flush_tlb_all(void)
843{
844 int do_recycle;
845
846 do_recycle = 0;
847 spin_lock(&sid_lock);
848 __inc_irq_stat(irq_tlb_count);
849 if (dirty_space_ids > RECYCLE_THRESHOLD) {
850 BUG_ON(recycle_inuse); /* FIXME: Use a semaphore/wait queue here */
851 get_dirty_sids(&recycle_ndirty,recycle_dirty_array);
852 recycle_inuse++;
853 do_recycle++;
854 }
855 spin_unlock(&sid_lock);
856 on_each_cpu(flush_tlb_all_local, NULL, 1);
857 if (do_recycle) {
858 spin_lock(&sid_lock);
859 recycle_sids(recycle_ndirty,recycle_dirty_array);
860 recycle_inuse = 0;
861 spin_unlock(&sid_lock);
862 }
863}
864#else
865void flush_tlb_all(void)
866{
867 spin_lock(&sid_lock);
868 __inc_irq_stat(irq_tlb_count);
869 flush_tlb_all_local(NULL);
870 recycle_sids();
871 spin_unlock(&sid_lock);
872}
873#endif
874
875static const pgprot_t protection_map[16] = {
876 [VM_NONE] = PAGE_NONE,
877 [VM_READ] = PAGE_READONLY,
878 [VM_WRITE] = PAGE_NONE,
879 [VM_WRITE | VM_READ] = PAGE_READONLY,
880 [VM_EXEC] = PAGE_EXECREAD,
881 [VM_EXEC | VM_READ] = PAGE_EXECREAD,
882 [VM_EXEC | VM_WRITE] = PAGE_EXECREAD,
883 [VM_EXEC | VM_WRITE | VM_READ] = PAGE_EXECREAD,
884 [VM_SHARED] = PAGE_NONE,
885 [VM_SHARED | VM_READ] = PAGE_READONLY,
886 [VM_SHARED | VM_WRITE] = PAGE_WRITEONLY,
887 [VM_SHARED | VM_WRITE | VM_READ] = PAGE_SHARED,
888 [VM_SHARED | VM_EXEC] = PAGE_EXECREAD,
889 [VM_SHARED | VM_EXEC | VM_READ] = PAGE_EXECREAD,
890 [VM_SHARED | VM_EXEC | VM_WRITE] = PAGE_RWX,
891 [VM_SHARED | VM_EXEC | VM_WRITE | VM_READ] = PAGE_RWX
892};
893DECLARE_VM_GET_PAGE_PROT