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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#include <asm/asm-offsets.h>
36#include <asm/shmbuf.h>
37
38extern int data_start;
39extern void parisc_kernel_start(void); /* Kernel entry point in head.S */
40
41#if CONFIG_PGTABLE_LEVELS == 3
42pmd_t pmd0[PTRS_PER_PMD] __section(".data..vm0.pmd") __attribute__ ((aligned(PAGE_SIZE)));
43#endif
44
45pgd_t swapper_pg_dir[PTRS_PER_PGD] __section(".data..vm0.pgd") __attribute__ ((aligned(PAGE_SIZE)));
46pte_t pg0[PT_INITIAL * PTRS_PER_PTE] __section(".data..vm0.pte") __attribute__ ((aligned(PAGE_SIZE)));
47
48static struct resource data_resource = {
49 .name = "Kernel data",
50 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
51};
52
53static struct resource code_resource = {
54 .name = "Kernel code",
55 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
56};
57
58static struct resource pdcdata_resource = {
59 .name = "PDC data (Page Zero)",
60 .start = 0,
61 .end = 0x9ff,
62 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
63};
64
65static struct resource sysram_resources[MAX_PHYSMEM_RANGES] __ro_after_init;
66
67/* The following array is initialized from the firmware specific
68 * information retrieved in kernel/inventory.c.
69 */
70
71physmem_range_t pmem_ranges[MAX_PHYSMEM_RANGES] __initdata;
72int npmem_ranges __initdata;
73
74#ifdef CONFIG_64BIT
75#define MAX_MEM (1UL << MAX_PHYSMEM_BITS)
76#else /* !CONFIG_64BIT */
77#define MAX_MEM (3584U*1024U*1024U)
78#endif /* !CONFIG_64BIT */
79
80static unsigned long mem_limit __read_mostly = MAX_MEM;
81
82static void __init mem_limit_func(void)
83{
84 char *cp, *end;
85 unsigned long limit;
86
87 /* We need this before __setup() functions are called */
88
89 limit = MAX_MEM;
90 for (cp = boot_command_line; *cp; ) {
91 if (memcmp(cp, "mem=", 4) == 0) {
92 cp += 4;
93 limit = memparse(cp, &end);
94 if (end != cp)
95 break;
96 cp = end;
97 } else {
98 while (*cp != ' ' && *cp)
99 ++cp;
100 while (*cp == ' ')
101 ++cp;
102 }
103 }
104
105 if (limit < mem_limit)
106 mem_limit = limit;
107}
108
109#define MAX_GAP (0x40000000UL >> PAGE_SHIFT)
110
111static void __init setup_bootmem(void)
112{
113 unsigned long mem_max;
114#ifndef CONFIG_SPARSEMEM
115 physmem_range_t pmem_holes[MAX_PHYSMEM_RANGES - 1];
116 int npmem_holes;
117#endif
118 int i, sysram_resource_count;
119
120 disable_sr_hashing(); /* Turn off space register hashing */
121
122 /*
123 * Sort the ranges. Since the number of ranges is typically
124 * small, and performance is not an issue here, just do
125 * a simple insertion sort.
126 */
127
128 for (i = 1; i < npmem_ranges; i++) {
129 int j;
130
131 for (j = i; j > 0; j--) {
132 if (pmem_ranges[j-1].start_pfn <
133 pmem_ranges[j].start_pfn) {
134
135 break;
136 }
137 swap(pmem_ranges[j-1], pmem_ranges[j]);
138 }
139 }
140
141#ifndef CONFIG_SPARSEMEM
142 /*
143 * Throw out ranges that are too far apart (controlled by
144 * MAX_GAP).
145 */
146
147 for (i = 1; i < npmem_ranges; i++) {
148 if (pmem_ranges[i].start_pfn -
149 (pmem_ranges[i-1].start_pfn +
150 pmem_ranges[i-1].pages) > MAX_GAP) {
151 npmem_ranges = i;
152 printk("Large gap in memory detected (%ld pages). "
153 "Consider turning on CONFIG_SPARSEMEM\n",
154 pmem_ranges[i].start_pfn -
155 (pmem_ranges[i-1].start_pfn +
156 pmem_ranges[i-1].pages));
157 break;
158 }
159 }
160#endif
161
162 /* Print the memory ranges */
163 pr_info("Memory Ranges:\n");
164
165 for (i = 0; i < npmem_ranges; i++) {
166 struct resource *res = &sysram_resources[i];
167 unsigned long start;
168 unsigned long size;
169
170 size = (pmem_ranges[i].pages << PAGE_SHIFT);
171 start = (pmem_ranges[i].start_pfn << PAGE_SHIFT);
172 pr_info("%2d) Start 0x%016lx End 0x%016lx Size %6ld MB\n",
173 i, start, start + (size - 1), size >> 20);
174
175 /* request memory resource */
176 res->name = "System RAM";
177 res->start = start;
178 res->end = start + size - 1;
179 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
180 request_resource(&iomem_resource, res);
181 }
182
183 sysram_resource_count = npmem_ranges;
184
185 /*
186 * For 32 bit kernels we limit the amount of memory we can
187 * support, in order to preserve enough kernel address space
188 * for other purposes. For 64 bit kernels we don't normally
189 * limit the memory, but this mechanism can be used to
190 * artificially limit the amount of memory (and it is written
191 * to work with multiple memory ranges).
192 */
193
194 mem_limit_func(); /* check for "mem=" argument */
195
196 mem_max = 0;
197 for (i = 0; i < npmem_ranges; i++) {
198 unsigned long rsize;
199
200 rsize = pmem_ranges[i].pages << PAGE_SHIFT;
201 if ((mem_max + rsize) > mem_limit) {
202 printk(KERN_WARNING "Memory truncated to %ld MB\n", mem_limit >> 20);
203 if (mem_max == mem_limit)
204 npmem_ranges = i;
205 else {
206 pmem_ranges[i].pages = (mem_limit >> PAGE_SHIFT)
207 - (mem_max >> PAGE_SHIFT);
208 npmem_ranges = i + 1;
209 mem_max = mem_limit;
210 }
211 break;
212 }
213 mem_max += rsize;
214 }
215
216 printk(KERN_INFO "Total Memory: %ld MB\n",mem_max >> 20);
217
218#ifndef CONFIG_SPARSEMEM
219 /* Merge the ranges, keeping track of the holes */
220 {
221 unsigned long end_pfn;
222 unsigned long hole_pages;
223
224 npmem_holes = 0;
225 end_pfn = pmem_ranges[0].start_pfn + pmem_ranges[0].pages;
226 for (i = 1; i < npmem_ranges; i++) {
227
228 hole_pages = pmem_ranges[i].start_pfn - end_pfn;
229 if (hole_pages) {
230 pmem_holes[npmem_holes].start_pfn = end_pfn;
231 pmem_holes[npmem_holes++].pages = hole_pages;
232 end_pfn += hole_pages;
233 }
234 end_pfn += pmem_ranges[i].pages;
235 }
236
237 pmem_ranges[0].pages = end_pfn - pmem_ranges[0].start_pfn;
238 npmem_ranges = 1;
239 }
240#endif
241
242 /*
243 * Initialize and free the full range of memory in each range.
244 */
245
246 max_pfn = 0;
247 for (i = 0; i < npmem_ranges; i++) {
248 unsigned long start_pfn;
249 unsigned long npages;
250 unsigned long start;
251 unsigned long size;
252
253 start_pfn = pmem_ranges[i].start_pfn;
254 npages = pmem_ranges[i].pages;
255
256 start = start_pfn << PAGE_SHIFT;
257 size = npages << PAGE_SHIFT;
258
259 /* add system RAM memblock */
260 memblock_add(start, size);
261
262 if ((start_pfn + npages) > max_pfn)
263 max_pfn = start_pfn + npages;
264 }
265
266 /*
267 * We can't use memblock top-down allocations because we only
268 * created the initial mapping up to KERNEL_INITIAL_SIZE in
269 * the assembly bootup code.
270 */
271 memblock_set_bottom_up(true);
272
273 /* IOMMU is always used to access "high mem" on those boxes
274 * that can support enough mem that a PCI device couldn't
275 * directly DMA to any physical addresses.
276 * ISA DMA support will need to revisit this.
277 */
278 max_low_pfn = max_pfn;
279
280 /* reserve PAGE0 pdc memory, kernel text/data/bss & bootmap */
281
282#define PDC_CONSOLE_IO_IODC_SIZE 32768
283
284 memblock_reserve(0UL, (unsigned long)(PAGE0->mem_free +
285 PDC_CONSOLE_IO_IODC_SIZE));
286 memblock_reserve(__pa(KERNEL_BINARY_TEXT_START),
287 (unsigned long)(_end - KERNEL_BINARY_TEXT_START));
288
289#ifndef CONFIG_SPARSEMEM
290
291 /* reserve the holes */
292
293 for (i = 0; i < npmem_holes; i++) {
294 memblock_reserve((pmem_holes[i].start_pfn << PAGE_SHIFT),
295 (pmem_holes[i].pages << PAGE_SHIFT));
296 }
297#endif
298
299#ifdef CONFIG_BLK_DEV_INITRD
300 if (initrd_start) {
301 printk(KERN_INFO "initrd: %08lx-%08lx\n", initrd_start, initrd_end);
302 if (__pa(initrd_start) < mem_max) {
303 unsigned long initrd_reserve;
304
305 if (__pa(initrd_end) > mem_max) {
306 initrd_reserve = mem_max - __pa(initrd_start);
307 } else {
308 initrd_reserve = initrd_end - initrd_start;
309 }
310 initrd_below_start_ok = 1;
311 printk(KERN_INFO "initrd: reserving %08lx-%08lx (mem_max %08lx)\n", __pa(initrd_start), __pa(initrd_start) + initrd_reserve, mem_max);
312
313 memblock_reserve(__pa(initrd_start), initrd_reserve);
314 }
315 }
316#endif
317
318 data_resource.start = virt_to_phys(&data_start);
319 data_resource.end = virt_to_phys(_end) - 1;
320 code_resource.start = virt_to_phys(_text);
321 code_resource.end = virt_to_phys(&data_start)-1;
322
323 /* We don't know which region the kernel will be in, so try
324 * all of them.
325 */
326 for (i = 0; i < sysram_resource_count; i++) {
327 struct resource *res = &sysram_resources[i];
328 request_resource(res, &code_resource);
329 request_resource(res, &data_resource);
330 }
331 request_resource(&sysram_resources[0], &pdcdata_resource);
332
333 /* Initialize Page Deallocation Table (PDT) and check for bad memory. */
334 pdc_pdt_init();
335
336 memblock_allow_resize();
337 memblock_dump_all();
338}
339
340static bool kernel_set_to_readonly;
341
342static void __ref map_pages(unsigned long start_vaddr,
343 unsigned long start_paddr, unsigned long size,
344 pgprot_t pgprot, int force)
345{
346 pmd_t *pmd;
347 pte_t *pg_table;
348 unsigned long end_paddr;
349 unsigned long start_pmd;
350 unsigned long start_pte;
351 unsigned long tmp1;
352 unsigned long tmp2;
353 unsigned long address;
354 unsigned long vaddr;
355 unsigned long ro_start;
356 unsigned long ro_end;
357 unsigned long kernel_start, kernel_end;
358
359 ro_start = __pa((unsigned long)_text);
360 ro_end = __pa((unsigned long)&data_start);
361 kernel_start = __pa((unsigned long)&__init_begin);
362 kernel_end = __pa((unsigned long)&_end);
363
364 end_paddr = start_paddr + size;
365
366 /* for 2-level configuration PTRS_PER_PMD is 0 so start_pmd will be 0 */
367 start_pmd = ((start_vaddr >> PMD_SHIFT) & (PTRS_PER_PMD - 1));
368 start_pte = ((start_vaddr >> PAGE_SHIFT) & (PTRS_PER_PTE - 1));
369
370 address = start_paddr;
371 vaddr = start_vaddr;
372 while (address < end_paddr) {
373 pgd_t *pgd = pgd_offset_k(vaddr);
374 p4d_t *p4d = p4d_offset(pgd, vaddr);
375 pud_t *pud = pud_offset(p4d, vaddr);
376
377#if CONFIG_PGTABLE_LEVELS == 3
378 if (pud_none(*pud)) {
379 pmd = memblock_alloc(PAGE_SIZE << PMD_TABLE_ORDER,
380 PAGE_SIZE << PMD_TABLE_ORDER);
381 if (!pmd)
382 panic("pmd allocation failed.\n");
383 pud_populate(NULL, pud, pmd);
384 }
385#endif
386
387 pmd = pmd_offset(pud, vaddr);
388 for (tmp1 = start_pmd; tmp1 < PTRS_PER_PMD; tmp1++, pmd++) {
389 if (pmd_none(*pmd)) {
390 pg_table = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
391 if (!pg_table)
392 panic("page table allocation failed\n");
393 pmd_populate_kernel(NULL, pmd, pg_table);
394 }
395
396 pg_table = pte_offset_kernel(pmd, vaddr);
397 for (tmp2 = start_pte; tmp2 < PTRS_PER_PTE; tmp2++, pg_table++) {
398 pte_t pte;
399 pgprot_t prot;
400 bool huge = false;
401
402 if (force) {
403 prot = pgprot;
404 } else if (address < kernel_start || address >= kernel_end) {
405 /* outside kernel memory */
406 prot = PAGE_KERNEL;
407 } else if (!kernel_set_to_readonly) {
408 /* still initializing, allow writing to RO memory */
409 prot = PAGE_KERNEL_RWX;
410 huge = true;
411 } else if (address >= ro_start) {
412 /* Code (ro) and Data areas */
413 prot = (address < ro_end) ?
414 PAGE_KERNEL_EXEC : PAGE_KERNEL;
415 huge = true;
416 } else {
417 prot = PAGE_KERNEL;
418 }
419
420 pte = __mk_pte(address, prot);
421 if (huge)
422 pte = pte_mkhuge(pte);
423
424 if (address >= end_paddr)
425 break;
426
427 set_pte(pg_table, pte);
428
429 address += PAGE_SIZE;
430 vaddr += PAGE_SIZE;
431 }
432 start_pte = 0;
433
434 if (address >= end_paddr)
435 break;
436 }
437 start_pmd = 0;
438 }
439}
440
441void __init set_kernel_text_rw(int enable_read_write)
442{
443 unsigned long start = (unsigned long) __init_begin;
444 unsigned long end = (unsigned long) &data_start;
445
446 map_pages(start, __pa(start), end-start,
447 PAGE_KERNEL_RWX, enable_read_write ? 1:0);
448
449 /* force the kernel to see the new page table entries */
450 flush_cache_all();
451 flush_tlb_all();
452}
453
454void free_initmem(void)
455{
456 unsigned long init_begin = (unsigned long)__init_begin;
457 unsigned long init_end = (unsigned long)__init_end;
458 unsigned long kernel_end = (unsigned long)&_end;
459
460 /* Remap kernel text and data, but do not touch init section yet. */
461 kernel_set_to_readonly = true;
462 map_pages(init_end, __pa(init_end), kernel_end - init_end,
463 PAGE_KERNEL, 0);
464
465 /* The init text pages are marked R-X. We have to
466 * flush the icache and mark them RW-
467 *
468 * Do a dummy remap of the data section first (the data
469 * section is already PAGE_KERNEL) to pull in the TLB entries
470 * for map_kernel */
471 map_pages(init_begin, __pa(init_begin), init_end - init_begin,
472 PAGE_KERNEL_RWX, 1);
473 /* now remap at PAGE_KERNEL since the TLB is pre-primed to execute
474 * map_pages */
475 map_pages(init_begin, __pa(init_begin), init_end - init_begin,
476 PAGE_KERNEL, 1);
477
478 /* force the kernel to see the new TLB entries */
479 __flush_tlb_range(0, init_begin, kernel_end);
480
481 /* finally dump all the instructions which were cached, since the
482 * pages are no-longer executable */
483 flush_icache_range(init_begin, init_end);
484
485 free_initmem_default(POISON_FREE_INITMEM);
486
487 /* set up a new led state on systems shipped LED State panel */
488 pdc_chassis_send_status(PDC_CHASSIS_DIRECT_BCOMPLETE);
489}
490
491
492#ifdef CONFIG_STRICT_KERNEL_RWX
493void mark_rodata_ro(void)
494{
495 /* rodata memory was already mapped with KERNEL_RO access rights by
496 pagetable_init() and map_pages(). No need to do additional stuff here */
497 unsigned long roai_size = __end_ro_after_init - __start_ro_after_init;
498
499 pr_info("Write protected read-only-after-init data: %luk\n", roai_size >> 10);
500}
501#endif
502
503
504/*
505 * Just an arbitrary offset to serve as a "hole" between mapping areas
506 * (between top of physical memory and a potential pcxl dma mapping
507 * area, and below the vmalloc mapping area).
508 *
509 * The current 32K value just means that there will be a 32K "hole"
510 * between mapping areas. That means that any out-of-bounds memory
511 * accesses will hopefully be caught. The vmalloc() routines leaves
512 * a hole of 4kB between each vmalloced area for the same reason.
513 */
514
515 /* Leave room for gateway page expansion */
516#if KERNEL_MAP_START < GATEWAY_PAGE_SIZE
517#error KERNEL_MAP_START is in gateway reserved region
518#endif
519#define MAP_START (KERNEL_MAP_START)
520
521#define VM_MAP_OFFSET (32*1024)
522#define SET_MAP_OFFSET(x) ((void *)(((unsigned long)(x) + VM_MAP_OFFSET) \
523 & ~(VM_MAP_OFFSET-1)))
524
525void *parisc_vmalloc_start __ro_after_init;
526EXPORT_SYMBOL(parisc_vmalloc_start);
527
528void __init mem_init(void)
529{
530 /* Do sanity checks on IPC (compat) structures */
531 BUILD_BUG_ON(sizeof(struct ipc64_perm) != 48);
532#ifndef CONFIG_64BIT
533 BUILD_BUG_ON(sizeof(struct semid64_ds) != 80);
534 BUILD_BUG_ON(sizeof(struct msqid64_ds) != 104);
535 BUILD_BUG_ON(sizeof(struct shmid64_ds) != 104);
536#endif
537#ifdef CONFIG_COMPAT
538 BUILD_BUG_ON(sizeof(struct compat_ipc64_perm) != sizeof(struct ipc64_perm));
539 BUILD_BUG_ON(sizeof(struct compat_semid64_ds) != 80);
540 BUILD_BUG_ON(sizeof(struct compat_msqid64_ds) != 104);
541 BUILD_BUG_ON(sizeof(struct compat_shmid64_ds) != 104);
542#endif
543
544 /* Do sanity checks on page table constants */
545 BUILD_BUG_ON(PTE_ENTRY_SIZE != sizeof(pte_t));
546 BUILD_BUG_ON(PMD_ENTRY_SIZE != sizeof(pmd_t));
547 BUILD_BUG_ON(PGD_ENTRY_SIZE != sizeof(pgd_t));
548 BUILD_BUG_ON(PAGE_SHIFT + BITS_PER_PTE + BITS_PER_PMD + BITS_PER_PGD
549 > BITS_PER_LONG);
550#if CONFIG_PGTABLE_LEVELS == 3
551 BUILD_BUG_ON(PT_INITIAL > PTRS_PER_PMD);
552#else
553 BUILD_BUG_ON(PT_INITIAL > PTRS_PER_PGD);
554#endif
555
556#ifdef CONFIG_64BIT
557 /* avoid ldil_%L() asm statements to sign-extend into upper 32-bits */
558 BUILD_BUG_ON(__PAGE_OFFSET >= 0x80000000);
559 BUILD_BUG_ON(TMPALIAS_MAP_START >= 0x80000000);
560#endif
561
562 high_memory = __va((max_pfn << PAGE_SHIFT));
563 set_max_mapnr(max_low_pfn);
564 memblock_free_all();
565
566#ifdef CONFIG_PA11
567 if (boot_cpu_data.cpu_type == pcxl2 || boot_cpu_data.cpu_type == pcxl) {
568 pcxl_dma_start = (unsigned long)SET_MAP_OFFSET(MAP_START);
569 parisc_vmalloc_start = SET_MAP_OFFSET(pcxl_dma_start
570 + PCXL_DMA_MAP_SIZE);
571 } else
572#endif
573 parisc_vmalloc_start = SET_MAP_OFFSET(MAP_START);
574
575#if 0
576 /*
577 * Do not expose the virtual kernel memory layout to userspace.
578 * But keep code for debugging purposes.
579 */
580 printk("virtual kernel memory layout:\n"
581 " vmalloc : 0x%px - 0x%px (%4ld MB)\n"
582 " fixmap : 0x%px - 0x%px (%4ld kB)\n"
583 " memory : 0x%px - 0x%px (%4ld MB)\n"
584 " .init : 0x%px - 0x%px (%4ld kB)\n"
585 " .data : 0x%px - 0x%px (%4ld kB)\n"
586 " .text : 0x%px - 0x%px (%4ld kB)\n",
587
588 (void*)VMALLOC_START, (void*)VMALLOC_END,
589 (VMALLOC_END - VMALLOC_START) >> 20,
590
591 (void *)FIXMAP_START, (void *)(FIXMAP_START + FIXMAP_SIZE),
592 (unsigned long)(FIXMAP_SIZE / 1024),
593
594 __va(0), high_memory,
595 ((unsigned long)high_memory - (unsigned long)__va(0)) >> 20,
596
597 __init_begin, __init_end,
598 ((unsigned long)__init_end - (unsigned long)__init_begin) >> 10,
599
600 _etext, _edata,
601 ((unsigned long)_edata - (unsigned long)_etext) >> 10,
602
603 _text, _etext,
604 ((unsigned long)_etext - (unsigned long)_text) >> 10);
605#endif
606}
607
608unsigned long *empty_zero_page __ro_after_init;
609EXPORT_SYMBOL(empty_zero_page);
610
611/*
612 * pagetable_init() sets up the page tables
613 *
614 * Note that gateway_init() places the Linux gateway page at page 0.
615 * Since gateway pages cannot be dereferenced this has the desirable
616 * side effect of trapping those pesky NULL-reference errors in the
617 * kernel.
618 */
619static void __init pagetable_init(void)
620{
621 int range;
622
623 /* Map each physical memory range to its kernel vaddr */
624
625 for (range = 0; range < npmem_ranges; range++) {
626 unsigned long start_paddr;
627 unsigned long size;
628
629 start_paddr = pmem_ranges[range].start_pfn << PAGE_SHIFT;
630 size = pmem_ranges[range].pages << PAGE_SHIFT;
631
632 map_pages((unsigned long)__va(start_paddr), start_paddr,
633 size, PAGE_KERNEL, 0);
634 }
635
636#ifdef CONFIG_BLK_DEV_INITRD
637 if (initrd_end && initrd_end > mem_limit) {
638 printk(KERN_INFO "initrd: mapping %08lx-%08lx\n", initrd_start, initrd_end);
639 map_pages(initrd_start, __pa(initrd_start),
640 initrd_end - initrd_start, PAGE_KERNEL, 0);
641 }
642#endif
643
644 empty_zero_page = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
645 if (!empty_zero_page)
646 panic("zero page allocation failed.\n");
647
648}
649
650static void __init gateway_init(void)
651{
652 unsigned long linux_gateway_page_addr;
653 /* FIXME: This is 'const' in order to trick the compiler
654 into not treating it as DP-relative data. */
655 extern void * const linux_gateway_page;
656
657 linux_gateway_page_addr = LINUX_GATEWAY_ADDR & PAGE_MASK;
658
659 /*
660 * Setup Linux Gateway page.
661 *
662 * The Linux gateway page will reside in kernel space (on virtual
663 * page 0), so it doesn't need to be aliased into user space.
664 */
665
666 map_pages(linux_gateway_page_addr, __pa(&linux_gateway_page),
667 PAGE_SIZE, PAGE_GATEWAY, 1);
668}
669
670static void __init fixmap_init(void)
671{
672 unsigned long addr = FIXMAP_START;
673 unsigned long end = FIXMAP_START + FIXMAP_SIZE;
674 pgd_t *pgd = pgd_offset_k(addr);
675 p4d_t *p4d = p4d_offset(pgd, addr);
676 pud_t *pud = pud_offset(p4d, addr);
677 pmd_t *pmd;
678
679 BUILD_BUG_ON(FIXMAP_SIZE > PMD_SIZE);
680
681#if CONFIG_PGTABLE_LEVELS == 3
682 if (pud_none(*pud)) {
683 pmd = memblock_alloc(PAGE_SIZE << PMD_TABLE_ORDER,
684 PAGE_SIZE << PMD_TABLE_ORDER);
685 if (!pmd)
686 panic("fixmap: pmd allocation failed.\n");
687 pud_populate(NULL, pud, pmd);
688 }
689#endif
690
691 pmd = pmd_offset(pud, addr);
692 do {
693 pte_t *pte = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
694 if (!pte)
695 panic("fixmap: pte allocation failed.\n");
696
697 pmd_populate_kernel(&init_mm, pmd, pte);
698
699 addr += PAGE_SIZE;
700 } while (addr < end);
701}
702
703static void __init parisc_bootmem_free(void)
704{
705 unsigned long max_zone_pfn[MAX_NR_ZONES] = { 0, };
706
707 max_zone_pfn[0] = memblock_end_of_DRAM();
708
709 free_area_init(max_zone_pfn);
710}
711
712void __init paging_init(void)
713{
714 setup_bootmem();
715 pagetable_init();
716 gateway_init();
717 fixmap_init();
718 flush_cache_all_local(); /* start with known state */
719 flush_tlb_all_local(NULL);
720
721 sparse_init();
722 parisc_bootmem_free();
723}
724
725static void alloc_btlb(unsigned long start, unsigned long end, int *slot,
726 unsigned long entry_info)
727{
728 const int slot_max = btlb_info.fixed_range_info.num_comb;
729 int min_num_pages = btlb_info.min_size;
730 unsigned long size;
731
732 /* map at minimum 4 pages */
733 if (min_num_pages < 4)
734 min_num_pages = 4;
735
736 size = HUGEPAGE_SIZE;
737 while (start < end && *slot < slot_max && size >= PAGE_SIZE) {
738 /* starting address must have same alignment as size! */
739 /* if correctly aligned and fits in double size, increase */
740 if (((start & (2 * size - 1)) == 0) &&
741 (end - start) >= (2 * size)) {
742 size <<= 1;
743 continue;
744 }
745 /* if current size alignment is too big, try smaller size */
746 if ((start & (size - 1)) != 0) {
747 size >>= 1;
748 continue;
749 }
750 if ((end - start) >= size) {
751 if ((size >> PAGE_SHIFT) >= min_num_pages)
752 pdc_btlb_insert(start >> PAGE_SHIFT, __pa(start) >> PAGE_SHIFT,
753 size >> PAGE_SHIFT, entry_info, *slot);
754 (*slot)++;
755 start += size;
756 continue;
757 }
758 size /= 2;
759 continue;
760 }
761}
762
763void btlb_init_per_cpu(void)
764{
765 unsigned long s, t, e;
766 int slot;
767
768 /* BTLBs are not available on 64-bit CPUs */
769 if (IS_ENABLED(CONFIG_PA20))
770 return;
771 else if (pdc_btlb_info(&btlb_info) < 0) {
772 memset(&btlb_info, 0, sizeof btlb_info);
773 }
774
775 /* insert BLTLBs for code and data segments */
776 s = (uintptr_t) dereference_function_descriptor(&_stext);
777 e = (uintptr_t) dereference_function_descriptor(&_etext);
778 t = (uintptr_t) dereference_function_descriptor(&_sdata);
779 BUG_ON(t != e);
780
781 /* code segments */
782 slot = 0;
783 alloc_btlb(s, e, &slot, 0x13800000);
784
785 /* sanity check */
786 t = (uintptr_t) dereference_function_descriptor(&_edata);
787 e = (uintptr_t) dereference_function_descriptor(&__bss_start);
788 BUG_ON(t != e);
789
790 /* data segments */
791 s = (uintptr_t) dereference_function_descriptor(&_sdata);
792 e = (uintptr_t) dereference_function_descriptor(&__bss_stop);
793 alloc_btlb(s, e, &slot, 0x11800000);
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;
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[BIT_WORD(index)] |= BIT_MASK(index);
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, mask;
860
861 dirty_space_offset = &dirty_space_id[BIT_WORD(index)];
862 mask = BIT_MASK(index);
863
864 spin_lock(&sid_lock);
865
866 BUG_ON(*dirty_space_offset & mask); /* attempt to free space id twice */
867
868 *dirty_space_offset |= mask;
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 do_recycle = 0;
948 spin_lock(&sid_lock);
949 __inc_irq_stat(irq_tlb_count);
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 spin_lock(&sid_lock);
969 __inc_irq_stat(irq_tlb_count);
970 flush_tlb_all_local(NULL);
971 recycle_sids();
972 spin_unlock(&sid_lock);
973}
974#endif
975
976static const pgprot_t protection_map[16] = {
977 [VM_NONE] = PAGE_NONE,
978 [VM_READ] = PAGE_READONLY,
979 [VM_WRITE] = PAGE_NONE,
980 [VM_WRITE | VM_READ] = PAGE_READONLY,
981 [VM_EXEC] = PAGE_EXECREAD,
982 [VM_EXEC | VM_READ] = PAGE_EXECREAD,
983 [VM_EXEC | VM_WRITE] = PAGE_EXECREAD,
984 [VM_EXEC | VM_WRITE | VM_READ] = PAGE_EXECREAD,
985 [VM_SHARED] = PAGE_NONE,
986 [VM_SHARED | VM_READ] = PAGE_READONLY,
987 [VM_SHARED | VM_WRITE] = PAGE_WRITEONLY,
988 [VM_SHARED | VM_WRITE | VM_READ] = PAGE_SHARED,
989 [VM_SHARED | VM_EXEC] = PAGE_EXECREAD,
990 [VM_SHARED | VM_EXEC | VM_READ] = PAGE_EXECREAD,
991 [VM_SHARED | VM_EXEC | VM_WRITE] = PAGE_RWX,
992 [VM_SHARED | VM_EXEC | VM_WRITE | VM_READ] = PAGE_RWX
993};
994DECLARE_VM_GET_PAGE_PROT