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Linux/arch/parisc/mm/init.c

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

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