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/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 #include <asm/sparsemem.h>
36
37 extern int data_start;
38 extern void parisc_kernel_start(void); /* Kernel entry point in head.S */
39
40 #if CONFIG_PGTABLE_LEVELS == 3
41 /* NOTE: This layout exactly conforms to the hybrid L2/L3 page table layout
42 * with the first pmd adjacent to the pgd and below it. gcc doesn't actually
43 * guarantee that global objects will be laid out in memory in the same order
44 * as the order of declaration, so put these in different sections and use
45 * the linker script to order them. */
46 pmd_t pmd0[PTRS_PER_PMD] __attribute__ ((__section__ (".data..vm0.pmd"), aligned(PAGE_SIZE)));
47 #endif
48
49 pgd_t swapper_pg_dir[PTRS_PER_PGD] __attribute__ ((__section__ (".data..vm0.pgd"), aligned(PAGE_SIZE)));
50 pte_t pg0[PT_INITIAL * PTRS_PER_PTE] __attribute__ ((__section__ (".data..vm0.pte"), aligned(PAGE_SIZE)));
51
52 static struct resource data_resource = {
53 .name = "Kernel data",
54 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
55 };
56
57 static struct resource code_resource = {
58 .name = "Kernel code",
59 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
60 };
61
62 static struct resource pdcdata_resource = {
63 .name = "PDC data (Page Zero)",
64 .start = 0,
65 .end = 0x9ff,
66 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
67 };
68
69 static struct resource sysram_resources[MAX_PHYSMEM_RANGES] __ro_after_init;
70
71 /* The following array is initialized from the firmware specific
72 * information retrieved in kernel/inventory.c.
73 */
74
75 physmem_range_t pmem_ranges[MAX_PHYSMEM_RANGES] __initdata;
76 int npmem_ranges __initdata;
77
78 #ifdef CONFIG_64BIT
79 #define MAX_MEM (1UL << MAX_PHYSMEM_BITS)
80 #else /* !CONFIG_64BIT */
81 #define MAX_MEM (3584U*1024U*1024U)
82 #endif /* !CONFIG_64BIT */
83
84 static unsigned long mem_limit __read_mostly = MAX_MEM;
85
mem_limit_func(void)86 static void __init mem_limit_func(void)
87 {
88 char *cp, *end;
89 unsigned long limit;
90
91 /* We need this before __setup() functions are called */
92
93 limit = MAX_MEM;
94 for (cp = boot_command_line; *cp; ) {
95 if (memcmp(cp, "mem=", 4) == 0) {
96 cp += 4;
97 limit = memparse(cp, &end);
98 if (end != cp)
99 break;
100 cp = end;
101 } else {
102 while (*cp != ' ' && *cp)
103 ++cp;
104 while (*cp == ' ')
105 ++cp;
106 }
107 }
108
109 if (limit < mem_limit)
110 mem_limit = limit;
111 }
112
113 #define MAX_GAP (0x40000000UL >> PAGE_SHIFT)
114
setup_bootmem(void)115 static void __init setup_bootmem(void)
116 {
117 unsigned long mem_max;
118 #ifndef CONFIG_SPARSEMEM
119 physmem_range_t pmem_holes[MAX_PHYSMEM_RANGES - 1];
120 int npmem_holes;
121 #endif
122 int i, sysram_resource_count;
123
124 disable_sr_hashing(); /* Turn off space register hashing */
125
126 /*
127 * Sort the ranges. Since the number of ranges is typically
128 * small, and performance is not an issue here, just do
129 * a simple insertion sort.
130 */
131
132 for (i = 1; i < npmem_ranges; i++) {
133 int j;
134
135 for (j = i; j > 0; j--) {
136 physmem_range_t tmp;
137
138 if (pmem_ranges[j-1].start_pfn <
139 pmem_ranges[j].start_pfn) {
140
141 break;
142 }
143 tmp = pmem_ranges[j-1];
144 pmem_ranges[j-1] = pmem_ranges[j];
145 pmem_ranges[j] = tmp;
146 }
147 }
148
149 #ifndef CONFIG_SPARSEMEM
150 /*
151 * Throw out ranges that are too far apart (controlled by
152 * MAX_GAP).
153 */
154
155 for (i = 1; i < npmem_ranges; i++) {
156 if (pmem_ranges[i].start_pfn -
157 (pmem_ranges[i-1].start_pfn +
158 pmem_ranges[i-1].pages) > MAX_GAP) {
159 npmem_ranges = i;
160 printk("Large gap in memory detected (%ld pages). "
161 "Consider turning on CONFIG_SPARSEMEM\n",
162 pmem_ranges[i].start_pfn -
163 (pmem_ranges[i-1].start_pfn +
164 pmem_ranges[i-1].pages));
165 break;
166 }
167 }
168 #endif
169
170 /* Print the memory ranges */
171 pr_info("Memory Ranges:\n");
172
173 for (i = 0; i < npmem_ranges; i++) {
174 struct resource *res = &sysram_resources[i];
175 unsigned long start;
176 unsigned long size;
177
178 size = (pmem_ranges[i].pages << PAGE_SHIFT);
179 start = (pmem_ranges[i].start_pfn << PAGE_SHIFT);
180 pr_info("%2d) Start 0x%016lx End 0x%016lx Size %6ld MB\n",
181 i, start, start + (size - 1), size >> 20);
182
183 /* request memory resource */
184 res->name = "System RAM";
185 res->start = start;
186 res->end = start + size - 1;
187 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
188 request_resource(&iomem_resource, res);
189 }
190
191 sysram_resource_count = npmem_ranges;
192
193 /*
194 * For 32 bit kernels we limit the amount of memory we can
195 * support, in order to preserve enough kernel address space
196 * for other purposes. For 64 bit kernels we don't normally
197 * limit the memory, but this mechanism can be used to
198 * artificially limit the amount of memory (and it is written
199 * to work with multiple memory ranges).
200 */
201
202 mem_limit_func(); /* check for "mem=" argument */
203
204 mem_max = 0;
205 for (i = 0; i < npmem_ranges; i++) {
206 unsigned long rsize;
207
208 rsize = pmem_ranges[i].pages << PAGE_SHIFT;
209 if ((mem_max + rsize) > mem_limit) {
210 printk(KERN_WARNING "Memory truncated to %ld MB\n", mem_limit >> 20);
211 if (mem_max == mem_limit)
212 npmem_ranges = i;
213 else {
214 pmem_ranges[i].pages = (mem_limit >> PAGE_SHIFT)
215 - (mem_max >> PAGE_SHIFT);
216 npmem_ranges = i + 1;
217 mem_max = mem_limit;
218 }
219 break;
220 }
221 mem_max += rsize;
222 }
223
224 printk(KERN_INFO "Total Memory: %ld MB\n",mem_max >> 20);
225
226 #ifndef CONFIG_SPARSEMEM
227 /* Merge the ranges, keeping track of the holes */
228 {
229 unsigned long end_pfn;
230 unsigned long hole_pages;
231
232 npmem_holes = 0;
233 end_pfn = pmem_ranges[0].start_pfn + pmem_ranges[0].pages;
234 for (i = 1; i < npmem_ranges; i++) {
235
236 hole_pages = pmem_ranges[i].start_pfn - end_pfn;
237 if (hole_pages) {
238 pmem_holes[npmem_holes].start_pfn = end_pfn;
239 pmem_holes[npmem_holes++].pages = hole_pages;
240 end_pfn += hole_pages;
241 }
242 end_pfn += pmem_ranges[i].pages;
243 }
244
245 pmem_ranges[0].pages = end_pfn - pmem_ranges[0].start_pfn;
246 npmem_ranges = 1;
247 }
248 #endif
249
250 /*
251 * Initialize and free the full range of memory in each range.
252 */
253
254 max_pfn = 0;
255 for (i = 0; i < npmem_ranges; i++) {
256 unsigned long start_pfn;
257 unsigned long npages;
258 unsigned long start;
259 unsigned long size;
260
261 start_pfn = pmem_ranges[i].start_pfn;
262 npages = pmem_ranges[i].pages;
263
264 start = start_pfn << PAGE_SHIFT;
265 size = npages << PAGE_SHIFT;
266
267 /* add system RAM memblock */
268 memblock_add(start, size);
269
270 if ((start_pfn + npages) > max_pfn)
271 max_pfn = start_pfn + npages;
272 }
273
274 /*
275 * We can't use memblock top-down allocations because we only
276 * created the initial mapping up to KERNEL_INITIAL_SIZE in
277 * the assembly bootup code.
278 */
279 memblock_set_bottom_up(true);
280
281 /* IOMMU is always used to access "high mem" on those boxes
282 * that can support enough mem that a PCI device couldn't
283 * directly DMA to any physical addresses.
284 * ISA DMA support will need to revisit this.
285 */
286 max_low_pfn = max_pfn;
287
288 /* reserve PAGE0 pdc memory, kernel text/data/bss & bootmap */
289
290 #define PDC_CONSOLE_IO_IODC_SIZE 32768
291
292 memblock_reserve(0UL, (unsigned long)(PAGE0->mem_free +
293 PDC_CONSOLE_IO_IODC_SIZE));
294 memblock_reserve(__pa(KERNEL_BINARY_TEXT_START),
295 (unsigned long)(_end - KERNEL_BINARY_TEXT_START));
296
297 #ifndef CONFIG_SPARSEMEM
298
299 /* reserve the holes */
300
301 for (i = 0; i < npmem_holes; i++) {
302 memblock_reserve((pmem_holes[i].start_pfn << PAGE_SHIFT),
303 (pmem_holes[i].pages << PAGE_SHIFT));
304 }
305 #endif
306
307 #ifdef CONFIG_BLK_DEV_INITRD
308 if (initrd_start) {
309 printk(KERN_INFO "initrd: %08lx-%08lx\n", initrd_start, initrd_end);
310 if (__pa(initrd_start) < mem_max) {
311 unsigned long initrd_reserve;
312
313 if (__pa(initrd_end) > mem_max) {
314 initrd_reserve = mem_max - __pa(initrd_start);
315 } else {
316 initrd_reserve = initrd_end - initrd_start;
317 }
318 initrd_below_start_ok = 1;
319 printk(KERN_INFO "initrd: reserving %08lx-%08lx (mem_max %08lx)\n", __pa(initrd_start), __pa(initrd_start) + initrd_reserve, mem_max);
320
321 memblock_reserve(__pa(initrd_start), initrd_reserve);
322 }
323 }
324 #endif
325
326 data_resource.start = virt_to_phys(&data_start);
327 data_resource.end = virt_to_phys(_end) - 1;
328 code_resource.start = virt_to_phys(_text);
329 code_resource.end = virt_to_phys(&data_start)-1;
330
331 /* We don't know which region the kernel will be in, so try
332 * all of them.
333 */
334 for (i = 0; i < sysram_resource_count; i++) {
335 struct resource *res = &sysram_resources[i];
336 request_resource(res, &code_resource);
337 request_resource(res, &data_resource);
338 }
339 request_resource(&sysram_resources[0], &pdcdata_resource);
340
341 /* Initialize Page Deallocation Table (PDT) and check for bad memory. */
342 pdc_pdt_init();
343
344 memblock_allow_resize();
345 memblock_dump_all();
346 }
347
348 static bool kernel_set_to_readonly;
349
map_pages(unsigned long start_vaddr,unsigned long start_paddr,unsigned long size,pgprot_t pgprot,int force)350 static void __ref map_pages(unsigned long start_vaddr,
351 unsigned long start_paddr, unsigned long size,
352 pgprot_t pgprot, int force)
353 {
354 pgd_t *pg_dir;
355 pmd_t *pmd;
356 pte_t *pg_table;
357 unsigned long end_paddr;
358 unsigned long start_pmd;
359 unsigned long start_pte;
360 unsigned long tmp1;
361 unsigned long tmp2;
362 unsigned long address;
363 unsigned long vaddr;
364 unsigned long ro_start;
365 unsigned long ro_end;
366 unsigned long kernel_start, kernel_end;
367
368 ro_start = __pa((unsigned long)_text);
369 ro_end = __pa((unsigned long)&data_start);
370 kernel_start = __pa((unsigned long)&__init_begin);
371 kernel_end = __pa((unsigned long)&_end);
372
373 end_paddr = start_paddr + size;
374
375 pg_dir = pgd_offset_k(start_vaddr);
376
377 #if PTRS_PER_PMD == 1
378 start_pmd = 0;
379 #else
380 start_pmd = ((start_vaddr >> PMD_SHIFT) & (PTRS_PER_PMD - 1));
381 #endif
382 start_pte = ((start_vaddr >> PAGE_SHIFT) & (PTRS_PER_PTE - 1));
383
384 address = start_paddr;
385 vaddr = start_vaddr;
386 while (address < end_paddr) {
387 #if PTRS_PER_PMD == 1
388 pmd = (pmd_t *)__pa(pg_dir);
389 #else
390 pmd = (pmd_t *)pgd_address(*pg_dir);
391
392 /*
393 * pmd is physical at this point
394 */
395
396 if (!pmd) {
397 pmd = memblock_alloc(PAGE_SIZE << PMD_ORDER,
398 PAGE_SIZE << PMD_ORDER);
399 if (!pmd)
400 panic("pmd allocation failed.\n");
401 pmd = (pmd_t *) __pa(pmd);
402 }
403
404 pgd_populate(NULL, pg_dir, __va(pmd));
405 #endif
406 pg_dir++;
407
408 /* now change pmd to kernel virtual addresses */
409
410 pmd = (pmd_t *)__va(pmd) + start_pmd;
411 for (tmp1 = start_pmd; tmp1 < PTRS_PER_PMD; tmp1++, pmd++) {
412
413 /*
414 * pg_table is physical at this point
415 */
416
417 pg_table = (pte_t *)pmd_address(*pmd);
418 if (!pg_table) {
419 pg_table = memblock_alloc(PAGE_SIZE,
420 PAGE_SIZE);
421 if (!pg_table)
422 panic("page table allocation failed\n");
423 pg_table = (pte_t *) __pa(pg_table);
424 }
425
426 pmd_populate_kernel(NULL, pmd, __va(pg_table));
427
428 /* now change pg_table to kernel virtual addresses */
429
430 pg_table = (pte_t *) __va(pg_table) + start_pte;
431 for (tmp2 = start_pte; tmp2 < PTRS_PER_PTE; tmp2++, pg_table++) {
432 pte_t pte;
433 pgprot_t prot;
434 bool huge = false;
435
436 if (force) {
437 prot = pgprot;
438 } else if (address < kernel_start || address >= kernel_end) {
439 /* outside kernel memory */
440 prot = PAGE_KERNEL;
441 } else if (!kernel_set_to_readonly) {
442 /* still initializing, allow writing to RO memory */
443 prot = PAGE_KERNEL_RWX;
444 huge = true;
445 } else if (address >= ro_start) {
446 /* Code (ro) and Data areas */
447 prot = (address < ro_end) ?
448 PAGE_KERNEL_EXEC : PAGE_KERNEL;
449 huge = true;
450 } else {
451 prot = PAGE_KERNEL;
452 }
453
454 pte = __mk_pte(address, prot);
455 if (huge)
456 pte = pte_mkhuge(pte);
457
458 if (address >= end_paddr)
459 break;
460
461 set_pte(pg_table, pte);
462
463 address += PAGE_SIZE;
464 vaddr += PAGE_SIZE;
465 }
466 start_pte = 0;
467
468 if (address >= end_paddr)
469 break;
470 }
471 start_pmd = 0;
472 }
473 }
474
set_kernel_text_rw(int enable_read_write)475 void __init set_kernel_text_rw(int enable_read_write)
476 {
477 unsigned long start = (unsigned long) __init_begin;
478 unsigned long end = (unsigned long) &data_start;
479
480 map_pages(start, __pa(start), end-start,
481 PAGE_KERNEL_RWX, enable_read_write ? 1:0);
482
483 /* force the kernel to see the new page table entries */
484 flush_cache_all();
485 flush_tlb_all();
486 }
487
free_initmem(void)488 void free_initmem(void)
489 {
490 unsigned long init_begin = (unsigned long)__init_begin;
491 unsigned long init_end = (unsigned long)__init_end;
492 unsigned long kernel_end = (unsigned long)&_end;
493
494 /* Remap kernel text and data, but do not touch init section yet. */
495 kernel_set_to_readonly = true;
496 map_pages(init_end, __pa(init_end), kernel_end - init_end,
497 PAGE_KERNEL, 0);
498
499 /* The init text pages are marked R-X. We have to
500 * flush the icache and mark them RW-
501 *
502 * Do a dummy remap of the data section first (the data
503 * section is already PAGE_KERNEL) to pull in the TLB entries
504 * for map_kernel */
505 map_pages(init_begin, __pa(init_begin), init_end - init_begin,
506 PAGE_KERNEL_RWX, 1);
507 /* now remap at PAGE_KERNEL since the TLB is pre-primed to execute
508 * map_pages */
509 map_pages(init_begin, __pa(init_begin), init_end - init_begin,
510 PAGE_KERNEL, 1);
511
512 /* force the kernel to see the new TLB entries */
513 __flush_tlb_range(0, init_begin, kernel_end);
514
515 /* finally dump all the instructions which were cached, since the
516 * pages are no-longer executable */
517 flush_icache_range(init_begin, init_end);
518
519 free_initmem_default(POISON_FREE_INITMEM);
520
521 /* set up a new led state on systems shipped LED State panel */
522 pdc_chassis_send_status(PDC_CHASSIS_DIRECT_BCOMPLETE);
523 }
524
525
526 #ifdef CONFIG_STRICT_KERNEL_RWX
mark_rodata_ro(void)527 void mark_rodata_ro(void)
528 {
529 /* rodata memory was already mapped with KERNEL_RO access rights by
530 pagetable_init() and map_pages(). No need to do additional stuff here */
531 unsigned long roai_size = __end_ro_after_init - __start_ro_after_init;
532
533 pr_info("Write protected read-only-after-init data: %luk\n", roai_size >> 10);
534 }
535 #endif
536
537
538 /*
539 * Just an arbitrary offset to serve as a "hole" between mapping areas
540 * (between top of physical memory and a potential pcxl dma mapping
541 * area, and below the vmalloc mapping area).
542 *
543 * The current 32K value just means that there will be a 32K "hole"
544 * between mapping areas. That means that any out-of-bounds memory
545 * accesses will hopefully be caught. The vmalloc() routines leaves
546 * a hole of 4kB between each vmalloced area for the same reason.
547 */
548
549 /* Leave room for gateway page expansion */
550 #if KERNEL_MAP_START < GATEWAY_PAGE_SIZE
551 #error KERNEL_MAP_START is in gateway reserved region
552 #endif
553 #define MAP_START (KERNEL_MAP_START)
554
555 #define VM_MAP_OFFSET (32*1024)
556 #define SET_MAP_OFFSET(x) ((void *)(((unsigned long)(x) + VM_MAP_OFFSET) \
557 & ~(VM_MAP_OFFSET-1)))
558
559 void *parisc_vmalloc_start __ro_after_init;
560 EXPORT_SYMBOL(parisc_vmalloc_start);
561
562 #ifdef CONFIG_PA11
563 unsigned long pcxl_dma_start __ro_after_init;
564 #endif
565
mem_init(void)566 void __init mem_init(void)
567 {
568 /* Do sanity checks on IPC (compat) structures */
569 BUILD_BUG_ON(sizeof(struct ipc64_perm) != 48);
570 #ifndef CONFIG_64BIT
571 BUILD_BUG_ON(sizeof(struct semid64_ds) != 80);
572 BUILD_BUG_ON(sizeof(struct msqid64_ds) != 104);
573 BUILD_BUG_ON(sizeof(struct shmid64_ds) != 104);
574 #endif
575 #ifdef CONFIG_COMPAT
576 BUILD_BUG_ON(sizeof(struct compat_ipc64_perm) != sizeof(struct ipc64_perm));
577 BUILD_BUG_ON(sizeof(struct compat_semid64_ds) != 80);
578 BUILD_BUG_ON(sizeof(struct compat_msqid64_ds) != 104);
579 BUILD_BUG_ON(sizeof(struct compat_shmid64_ds) != 104);
580 #endif
581
582 /* Do sanity checks on page table constants */
583 BUILD_BUG_ON(PTE_ENTRY_SIZE != sizeof(pte_t));
584 BUILD_BUG_ON(PMD_ENTRY_SIZE != sizeof(pmd_t));
585 BUILD_BUG_ON(PGD_ENTRY_SIZE != sizeof(pgd_t));
586 BUILD_BUG_ON(PAGE_SHIFT + BITS_PER_PTE + BITS_PER_PMD + BITS_PER_PGD
587 > BITS_PER_LONG);
588
589 high_memory = __va((max_pfn << PAGE_SHIFT));
590 set_max_mapnr(max_low_pfn);
591 memblock_free_all();
592
593 #ifdef CONFIG_PA11
594 if (boot_cpu_data.cpu_type == pcxl2 || boot_cpu_data.cpu_type == pcxl) {
595 pcxl_dma_start = (unsigned long)SET_MAP_OFFSET(MAP_START);
596 parisc_vmalloc_start = SET_MAP_OFFSET(pcxl_dma_start
597 + PCXL_DMA_MAP_SIZE);
598 } else
599 #endif
600 parisc_vmalloc_start = SET_MAP_OFFSET(MAP_START);
601
602 mem_init_print_info(NULL);
603
604 #if 0
605 /*
606 * Do not expose the virtual kernel memory layout to userspace.
607 * But keep code for debugging purposes.
608 */
609 printk("virtual kernel memory layout:\n"
610 " vmalloc : 0x%px - 0x%px (%4ld MB)\n"
611 " fixmap : 0x%px - 0x%px (%4ld kB)\n"
612 " memory : 0x%px - 0x%px (%4ld MB)\n"
613 " .init : 0x%px - 0x%px (%4ld kB)\n"
614 " .data : 0x%px - 0x%px (%4ld kB)\n"
615 " .text : 0x%px - 0x%px (%4ld kB)\n",
616
617 (void*)VMALLOC_START, (void*)VMALLOC_END,
618 (VMALLOC_END - VMALLOC_START) >> 20,
619
620 (void *)FIXMAP_START, (void *)(FIXMAP_START + FIXMAP_SIZE),
621 (unsigned long)(FIXMAP_SIZE / 1024),
622
623 __va(0), high_memory,
624 ((unsigned long)high_memory - (unsigned long)__va(0)) >> 20,
625
626 __init_begin, __init_end,
627 ((unsigned long)__init_end - (unsigned long)__init_begin) >> 10,
628
629 _etext, _edata,
630 ((unsigned long)_edata - (unsigned long)_etext) >> 10,
631
632 _text, _etext,
633 ((unsigned long)_etext - (unsigned long)_text) >> 10);
634 #endif
635 }
636
637 unsigned long *empty_zero_page __ro_after_init;
638 EXPORT_SYMBOL(empty_zero_page);
639
640 /*
641 * pagetable_init() sets up the page tables
642 *
643 * Note that gateway_init() places the Linux gateway page at page 0.
644 * Since gateway pages cannot be dereferenced this has the desirable
645 * side effect of trapping those pesky NULL-reference errors in the
646 * kernel.
647 */
pagetable_init(void)648 static void __init pagetable_init(void)
649 {
650 int range;
651
652 /* Map each physical memory range to its kernel vaddr */
653
654 for (range = 0; range < npmem_ranges; range++) {
655 unsigned long start_paddr;
656 unsigned long end_paddr;
657 unsigned long size;
658
659 start_paddr = pmem_ranges[range].start_pfn << PAGE_SHIFT;
660 size = pmem_ranges[range].pages << PAGE_SHIFT;
661 end_paddr = start_paddr + size;
662
663 map_pages((unsigned long)__va(start_paddr), start_paddr,
664 size, PAGE_KERNEL, 0);
665 }
666
667 #ifdef CONFIG_BLK_DEV_INITRD
668 if (initrd_end && initrd_end > mem_limit) {
669 printk(KERN_INFO "initrd: mapping %08lx-%08lx\n", initrd_start, initrd_end);
670 map_pages(initrd_start, __pa(initrd_start),
671 initrd_end - initrd_start, PAGE_KERNEL, 0);
672 }
673 #endif
674
675 empty_zero_page = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
676 if (!empty_zero_page)
677 panic("zero page allocation failed.\n");
678
679 }
680
gateway_init(void)681 static void __init gateway_init(void)
682 {
683 unsigned long linux_gateway_page_addr;
684 /* FIXME: This is 'const' in order to trick the compiler
685 into not treating it as DP-relative data. */
686 extern void * const linux_gateway_page;
687
688 linux_gateway_page_addr = LINUX_GATEWAY_ADDR & PAGE_MASK;
689
690 /*
691 * Setup Linux Gateway page.
692 *
693 * The Linux gateway page will reside in kernel space (on virtual
694 * page 0), so it doesn't need to be aliased into user space.
695 */
696
697 map_pages(linux_gateway_page_addr, __pa(&linux_gateway_page),
698 PAGE_SIZE, PAGE_GATEWAY, 1);
699 }
700
parisc_bootmem_free(void)701 static void __init parisc_bootmem_free(void)
702 {
703 unsigned long zones_size[MAX_NR_ZONES] = { 0, };
704 unsigned long holes_size[MAX_NR_ZONES] = { 0, };
705 unsigned long mem_start_pfn = ~0UL, mem_end_pfn = 0, mem_size_pfn = 0;
706 int i;
707
708 for (i = 0; i < npmem_ranges; i++) {
709 unsigned long start = pmem_ranges[i].start_pfn;
710 unsigned long size = pmem_ranges[i].pages;
711 unsigned long end = start + size;
712
713 if (mem_start_pfn > start)
714 mem_start_pfn = start;
715 if (mem_end_pfn < end)
716 mem_end_pfn = end;
717 mem_size_pfn += size;
718 }
719
720 zones_size[0] = mem_end_pfn - mem_start_pfn;
721 holes_size[0] = zones_size[0] - mem_size_pfn;
722
723 free_area_init_node(0, zones_size, mem_start_pfn, holes_size);
724 }
725
paging_init(void)726 void __init paging_init(void)
727 {
728 setup_bootmem();
729 pagetable_init();
730 gateway_init();
731 flush_cache_all_local(); /* start with known state */
732 flush_tlb_all_local(NULL);
733
734 /*
735 * Mark all memblocks as present for sparsemem using
736 * memory_present() and then initialize sparsemem.
737 */
738 memblocks_present();
739 sparse_init();
740 parisc_bootmem_free();
741 }
742
743 #ifdef CONFIG_PA20
744
745 /*
746 * Currently, all PA20 chips have 18 bit protection IDs, which is the
747 * limiting factor (space ids are 32 bits).
748 */
749
750 #define NR_SPACE_IDS 262144
751
752 #else
753
754 /*
755 * Currently we have a one-to-one relationship between space IDs and
756 * protection IDs. Older parisc chips (PCXS, PCXT, PCXL, PCXL2) only
757 * support 15 bit protection IDs, so that is the limiting factor.
758 * PCXT' has 18 bit protection IDs, but only 16 bit spaceids, so it's
759 * probably not worth the effort for a special case here.
760 */
761
762 #define NR_SPACE_IDS 32768
763
764 #endif /* !CONFIG_PA20 */
765
766 #define RECYCLE_THRESHOLD (NR_SPACE_IDS / 2)
767 #define SID_ARRAY_SIZE (NR_SPACE_IDS / (8 * sizeof(long)))
768
769 static unsigned long space_id[SID_ARRAY_SIZE] = { 1 }; /* disallow space 0 */
770 static unsigned long dirty_space_id[SID_ARRAY_SIZE];
771 static unsigned long space_id_index;
772 static unsigned long free_space_ids = NR_SPACE_IDS - 1;
773 static unsigned long dirty_space_ids = 0;
774
775 static DEFINE_SPINLOCK(sid_lock);
776
alloc_sid(void)777 unsigned long alloc_sid(void)
778 {
779 unsigned long index;
780
781 spin_lock(&sid_lock);
782
783 if (free_space_ids == 0) {
784 if (dirty_space_ids != 0) {
785 spin_unlock(&sid_lock);
786 flush_tlb_all(); /* flush_tlb_all() calls recycle_sids() */
787 spin_lock(&sid_lock);
788 }
789 BUG_ON(free_space_ids == 0);
790 }
791
792 free_space_ids--;
793
794 index = find_next_zero_bit(space_id, NR_SPACE_IDS, space_id_index);
795 space_id[index >> SHIFT_PER_LONG] |= (1L << (index & (BITS_PER_LONG - 1)));
796 space_id_index = index;
797
798 spin_unlock(&sid_lock);
799
800 return index << SPACEID_SHIFT;
801 }
802
free_sid(unsigned long spaceid)803 void free_sid(unsigned long spaceid)
804 {
805 unsigned long index = spaceid >> SPACEID_SHIFT;
806 unsigned long *dirty_space_offset;
807
808 dirty_space_offset = dirty_space_id + (index >> SHIFT_PER_LONG);
809 index &= (BITS_PER_LONG - 1);
810
811 spin_lock(&sid_lock);
812
813 BUG_ON(*dirty_space_offset & (1L << index)); /* attempt to free space id twice */
814
815 *dirty_space_offset |= (1L << index);
816 dirty_space_ids++;
817
818 spin_unlock(&sid_lock);
819 }
820
821
822 #ifdef CONFIG_SMP
get_dirty_sids(unsigned long * ndirtyptr,unsigned long * dirty_array)823 static void get_dirty_sids(unsigned long *ndirtyptr,unsigned long *dirty_array)
824 {
825 int i;
826
827 /* NOTE: sid_lock must be held upon entry */
828
829 *ndirtyptr = dirty_space_ids;
830 if (dirty_space_ids != 0) {
831 for (i = 0; i < SID_ARRAY_SIZE; i++) {
832 dirty_array[i] = dirty_space_id[i];
833 dirty_space_id[i] = 0;
834 }
835 dirty_space_ids = 0;
836 }
837
838 return;
839 }
840
recycle_sids(unsigned long ndirty,unsigned long * dirty_array)841 static void recycle_sids(unsigned long ndirty,unsigned long *dirty_array)
842 {
843 int i;
844
845 /* NOTE: sid_lock must be held upon entry */
846
847 if (ndirty != 0) {
848 for (i = 0; i < SID_ARRAY_SIZE; i++) {
849 space_id[i] ^= dirty_array[i];
850 }
851
852 free_space_ids += ndirty;
853 space_id_index = 0;
854 }
855 }
856
857 #else /* CONFIG_SMP */
858
recycle_sids(void)859 static void recycle_sids(void)
860 {
861 int i;
862
863 /* NOTE: sid_lock must be held upon entry */
864
865 if (dirty_space_ids != 0) {
866 for (i = 0; i < SID_ARRAY_SIZE; i++) {
867 space_id[i] ^= dirty_space_id[i];
868 dirty_space_id[i] = 0;
869 }
870
871 free_space_ids += dirty_space_ids;
872 dirty_space_ids = 0;
873 space_id_index = 0;
874 }
875 }
876 #endif
877
878 /*
879 * flush_tlb_all() calls recycle_sids(), since whenever the entire tlb is
880 * purged, we can safely reuse the space ids that were released but
881 * not flushed from the tlb.
882 */
883
884 #ifdef CONFIG_SMP
885
886 static unsigned long recycle_ndirty;
887 static unsigned long recycle_dirty_array[SID_ARRAY_SIZE];
888 static unsigned int recycle_inuse;
889
flush_tlb_all(void)890 void flush_tlb_all(void)
891 {
892 int do_recycle;
893
894 do_recycle = 0;
895 spin_lock(&sid_lock);
896 __inc_irq_stat(irq_tlb_count);
897 if (dirty_space_ids > RECYCLE_THRESHOLD) {
898 BUG_ON(recycle_inuse); /* FIXME: Use a semaphore/wait queue here */
899 get_dirty_sids(&recycle_ndirty,recycle_dirty_array);
900 recycle_inuse++;
901 do_recycle++;
902 }
903 spin_unlock(&sid_lock);
904 on_each_cpu(flush_tlb_all_local, NULL, 1);
905 if (do_recycle) {
906 spin_lock(&sid_lock);
907 recycle_sids(recycle_ndirty,recycle_dirty_array);
908 recycle_inuse = 0;
909 spin_unlock(&sid_lock);
910 }
911 }
912 #else
flush_tlb_all(void)913 void flush_tlb_all(void)
914 {
915 spin_lock(&sid_lock);
916 __inc_irq_stat(irq_tlb_count);
917 flush_tlb_all_local(NULL);
918 recycle_sids();
919 spin_unlock(&sid_lock);
920 }
921 #endif
922