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Linux/arch/parisc/mm/init.c

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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/memblock.h>
 18 #include <linux/gfp.h>
 19 #include <linux/delay.h>
 20 #include <linux/init.h>
 21 #include <linux/pci.h>          /* for hppa_dma_ops and pcxl_dma_ops */
 22 #include <linux/initrd.h>
 23 #include <linux/swap.h>
 24 #include <linux/unistd.h>
 25 #include <linux/nodemask.h>     /* for node_online_map */
 26 #include <linux/pagemap.h>      /* for release_pages */
 27 #include <linux/compat.h>
 28 
 29 #include <asm/pgalloc.h>
 30 #include <asm/pgtable.h>
 31 #include <asm/tlb.h>
 32 #include <asm/pdc_chassis.h>
 33 #include <asm/mmzone.h>
 34 #include <asm/sections.h>
 35 #include <asm/msgbuf.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 #ifdef CONFIG_DISCONTIGMEM
 53 struct node_map_data node_data[MAX_NUMNODES] __read_mostly;
 54 signed char pfnnid_map[PFNNID_MAP_MAX] __read_mostly;
 55 #endif
 56 
 57 static struct resource data_resource = {
 58         .name   = "Kernel data",
 59         .flags  = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
 60 };
 61 
 62 static struct resource code_resource = {
 63         .name   = "Kernel code",
 64         .flags  = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
 65 };
 66 
 67 static struct resource pdcdata_resource = {
 68         .name   = "PDC data (Page Zero)",
 69         .start  = 0,
 70         .end    = 0x9ff,
 71         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM,
 72 };
 73 
 74 static struct resource sysram_resources[MAX_PHYSMEM_RANGES] __read_mostly;
 75 
 76 /* The following array is initialized from the firmware specific
 77  * information retrieved in kernel/inventory.c.
 78  */
 79 
 80 physmem_range_t pmem_ranges[MAX_PHYSMEM_RANGES] __read_mostly;
 81 int npmem_ranges __read_mostly;
 82 
 83 /*
 84  * get_memblock() allocates pages via memblock.
 85  * We can't use memblock_find_in_range(0, KERNEL_INITIAL_SIZE) here since it
 86  * doesn't allocate from bottom to top which is needed because we only created
 87  * the initial mapping up to KERNEL_INITIAL_SIZE in the assembly bootup code.
 88  */
 89 static void * __init get_memblock(unsigned long size)
 90 {
 91         static phys_addr_t search_addr __initdata;
 92         phys_addr_t phys;
 93 
 94         if (!search_addr)
 95                 search_addr = PAGE_ALIGN(__pa((unsigned long) &_end));
 96         search_addr = ALIGN(search_addr, size);
 97         while (!memblock_is_region_memory(search_addr, size) ||
 98                 memblock_is_region_reserved(search_addr, size)) {
 99                 search_addr += size;
100         }
101         phys = search_addr;
102 
103         if (phys)
104                 memblock_reserve(phys, size);
105         else
106                 panic("get_memblock() failed.\n");
107 
108         memset(__va(phys), 0, size);
109 
110         return __va(phys);
111 }
112 
113 #ifdef CONFIG_64BIT
114 #define MAX_MEM         (~0UL)
115 #else /* !CONFIG_64BIT */
116 #define MAX_MEM         (3584U*1024U*1024U)
117 #endif /* !CONFIG_64BIT */
118 
119 static unsigned long mem_limit __read_mostly = MAX_MEM;
120 
121 static void __init mem_limit_func(void)
122 {
123         char *cp, *end;
124         unsigned long limit;
125 
126         /* We need this before __setup() functions are called */
127 
128         limit = MAX_MEM;
129         for (cp = boot_command_line; *cp; ) {
130                 if (memcmp(cp, "mem=", 4) == 0) {
131                         cp += 4;
132                         limit = memparse(cp, &end);
133                         if (end != cp)
134                                 break;
135                         cp = end;
136                 } else {
137                         while (*cp != ' ' && *cp)
138                                 ++cp;
139                         while (*cp == ' ')
140                                 ++cp;
141                 }
142         }
143 
144         if (limit < mem_limit)
145                 mem_limit = limit;
146 }
147 
148 #define MAX_GAP (0x40000000UL >> PAGE_SHIFT)
149 
150 static void __init setup_bootmem(void)
151 {
152         unsigned long mem_max;
153 #ifndef CONFIG_DISCONTIGMEM
154         physmem_range_t pmem_holes[MAX_PHYSMEM_RANGES - 1];
155         int npmem_holes;
156 #endif
157         int i, sysram_resource_count;
158 
159         disable_sr_hashing(); /* Turn off space register hashing */
160 
161         /*
162          * Sort the ranges. Since the number of ranges is typically
163          * small, and performance is not an issue here, just do
164          * a simple insertion sort.
165          */
166 
167         for (i = 1; i < npmem_ranges; i++) {
168                 int j;
169 
170                 for (j = i; j > 0; j--) {
171                         unsigned long tmp;
172 
173                         if (pmem_ranges[j-1].start_pfn <
174                             pmem_ranges[j].start_pfn) {
175 
176                                 break;
177                         }
178                         tmp = pmem_ranges[j-1].start_pfn;
179                         pmem_ranges[j-1].start_pfn = pmem_ranges[j].start_pfn;
180                         pmem_ranges[j].start_pfn = tmp;
181                         tmp = pmem_ranges[j-1].pages;
182                         pmem_ranges[j-1].pages = pmem_ranges[j].pages;
183                         pmem_ranges[j].pages = tmp;
184                 }
185         }
186 
187 #ifndef CONFIG_DISCONTIGMEM
188         /*
189          * Throw out ranges that are too far apart (controlled by
190          * MAX_GAP).
191          */
192 
193         for (i = 1; i < npmem_ranges; i++) {
194                 if (pmem_ranges[i].start_pfn -
195                         (pmem_ranges[i-1].start_pfn +
196                          pmem_ranges[i-1].pages) > MAX_GAP) {
197                         npmem_ranges = i;
198                         printk("Large gap in memory detected (%ld pages). "
199                                "Consider turning on CONFIG_DISCONTIGMEM\n",
200                                pmem_ranges[i].start_pfn -
201                                (pmem_ranges[i-1].start_pfn +
202                                 pmem_ranges[i-1].pages));
203                         break;
204                 }
205         }
206 #endif
207 
208         /* Print the memory ranges */
209         pr_info("Memory Ranges:\n");
210 
211         for (i = 0; i < npmem_ranges; i++) {
212                 struct resource *res = &sysram_resources[i];
213                 unsigned long start;
214                 unsigned long size;
215 
216                 size = (pmem_ranges[i].pages << PAGE_SHIFT);
217                 start = (pmem_ranges[i].start_pfn << PAGE_SHIFT);
218                 pr_info("%2d) Start 0x%016lx End 0x%016lx Size %6ld MB\n",
219                         i, start, start + (size - 1), size >> 20);
220 
221                 /* request memory resource */
222                 res->name = "System RAM";
223                 res->start = start;
224                 res->end = start + size - 1;
225                 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
226                 request_resource(&iomem_resource, res);
227         }
228 
229         sysram_resource_count = npmem_ranges;
230 
231         /*
232          * For 32 bit kernels we limit the amount of memory we can
233          * support, in order to preserve enough kernel address space
234          * for other purposes. For 64 bit kernels we don't normally
235          * limit the memory, but this mechanism can be used to
236          * artificially limit the amount of memory (and it is written
237          * to work with multiple memory ranges).
238          */
239 
240         mem_limit_func();       /* check for "mem=" argument */
241 
242         mem_max = 0;
243         for (i = 0; i < npmem_ranges; i++) {
244                 unsigned long rsize;
245 
246                 rsize = pmem_ranges[i].pages << PAGE_SHIFT;
247                 if ((mem_max + rsize) > mem_limit) {
248                         printk(KERN_WARNING "Memory truncated to %ld MB\n", mem_limit >> 20);
249                         if (mem_max == mem_limit)
250                                 npmem_ranges = i;
251                         else {
252                                 pmem_ranges[i].pages =   (mem_limit >> PAGE_SHIFT)
253                                                        - (mem_max >> PAGE_SHIFT);
254                                 npmem_ranges = i + 1;
255                                 mem_max = mem_limit;
256                         }
257                         break;
258                 }
259                 mem_max += rsize;
260         }
261 
262         printk(KERN_INFO "Total Memory: %ld MB\n",mem_max >> 20);
263 
264 #ifndef CONFIG_DISCONTIGMEM
265         /* Merge the ranges, keeping track of the holes */
266 
267         {
268                 unsigned long end_pfn;
269                 unsigned long hole_pages;
270 
271                 npmem_holes = 0;
272                 end_pfn = pmem_ranges[0].start_pfn + pmem_ranges[0].pages;
273                 for (i = 1; i < npmem_ranges; i++) {
274 
275                         hole_pages = pmem_ranges[i].start_pfn - end_pfn;
276                         if (hole_pages) {
277                                 pmem_holes[npmem_holes].start_pfn = end_pfn;
278                                 pmem_holes[npmem_holes++].pages = hole_pages;
279                                 end_pfn += hole_pages;
280                         }
281                         end_pfn += pmem_ranges[i].pages;
282                 }
283 
284                 pmem_ranges[0].pages = end_pfn - pmem_ranges[0].start_pfn;
285                 npmem_ranges = 1;
286         }
287 #endif
288 
289 #ifdef CONFIG_DISCONTIGMEM
290         for (i = 0; i < MAX_PHYSMEM_RANGES; i++) {
291                 memset(NODE_DATA(i), 0, sizeof(pg_data_t));
292         }
293         memset(pfnnid_map, 0xff, sizeof(pfnnid_map));
294 
295         for (i = 0; i < npmem_ranges; i++) {
296                 node_set_state(i, N_NORMAL_MEMORY);
297                 node_set_online(i);
298         }
299 #endif
300 
301         /*
302          * Initialize and free the full range of memory in each range.
303          */
304 
305         max_pfn = 0;
306         for (i = 0; i < npmem_ranges; i++) {
307                 unsigned long start_pfn;
308                 unsigned long npages;
309                 unsigned long start;
310                 unsigned long size;
311 
312                 start_pfn = pmem_ranges[i].start_pfn;
313                 npages = pmem_ranges[i].pages;
314 
315                 start = start_pfn << PAGE_SHIFT;
316                 size = npages << PAGE_SHIFT;
317 
318                 /* add system RAM memblock */
319                 memblock_add(start, size);
320 
321                 if ((start_pfn + npages) > max_pfn)
322                         max_pfn = start_pfn + npages;
323         }
324 
325         /* IOMMU is always used to access "high mem" on those boxes
326          * that can support enough mem that a PCI device couldn't
327          * directly DMA to any physical addresses.
328          * ISA DMA support will need to revisit this.
329          */
330         max_low_pfn = max_pfn;
331 
332         /* reserve PAGE0 pdc memory, kernel text/data/bss & bootmap */
333 
334 #define PDC_CONSOLE_IO_IODC_SIZE 32768
335 
336         memblock_reserve(0UL, (unsigned long)(PAGE0->mem_free +
337                                 PDC_CONSOLE_IO_IODC_SIZE));
338         memblock_reserve(__pa(KERNEL_BINARY_TEXT_START),
339                         (unsigned long)(_end - KERNEL_BINARY_TEXT_START));
340 
341 #ifndef CONFIG_DISCONTIGMEM
342 
343         /* reserve the holes */
344 
345         for (i = 0; i < npmem_holes; i++) {
346                 memblock_reserve((pmem_holes[i].start_pfn << PAGE_SHIFT),
347                                 (pmem_holes[i].pages << PAGE_SHIFT));
348         }
349 #endif
350 
351 #ifdef CONFIG_BLK_DEV_INITRD
352         if (initrd_start) {
353                 printk(KERN_INFO "initrd: %08lx-%08lx\n", initrd_start, initrd_end);
354                 if (__pa(initrd_start) < mem_max) {
355                         unsigned long initrd_reserve;
356 
357                         if (__pa(initrd_end) > mem_max) {
358                                 initrd_reserve = mem_max - __pa(initrd_start);
359                         } else {
360                                 initrd_reserve = initrd_end - initrd_start;
361                         }
362                         initrd_below_start_ok = 1;
363                         printk(KERN_INFO "initrd: reserving %08lx-%08lx (mem_max %08lx)\n", __pa(initrd_start), __pa(initrd_start) + initrd_reserve, mem_max);
364 
365                         memblock_reserve(__pa(initrd_start), initrd_reserve);
366                 }
367         }
368 #endif
369 
370         data_resource.start =  virt_to_phys(&data_start);
371         data_resource.end = virt_to_phys(_end) - 1;
372         code_resource.start = virt_to_phys(_text);
373         code_resource.end = virt_to_phys(&data_start)-1;
374 
375         /* We don't know which region the kernel will be in, so try
376          * all of them.
377          */
378         for (i = 0; i < sysram_resource_count; i++) {
379                 struct resource *res = &sysram_resources[i];
380                 request_resource(res, &code_resource);
381                 request_resource(res, &data_resource);
382         }
383         request_resource(&sysram_resources[0], &pdcdata_resource);
384 }
385 
386 static int __init parisc_text_address(unsigned long vaddr)
387 {
388         static unsigned long head_ptr __initdata;
389 
390         if (!head_ptr)
391                 head_ptr = PAGE_MASK & (unsigned long)
392                         dereference_function_descriptor(&parisc_kernel_start);
393 
394         return core_kernel_text(vaddr) || vaddr == head_ptr;
395 }
396 
397 static void __init map_pages(unsigned long start_vaddr,
398                              unsigned long start_paddr, unsigned long size,
399                              pgprot_t pgprot, int force)
400 {
401         pgd_t *pg_dir;
402         pmd_t *pmd;
403         pte_t *pg_table;
404         unsigned long end_paddr;
405         unsigned long start_pmd;
406         unsigned long start_pte;
407         unsigned long tmp1;
408         unsigned long tmp2;
409         unsigned long address;
410         unsigned long vaddr;
411         unsigned long ro_start;
412         unsigned long ro_end;
413         unsigned long kernel_end;
414 
415         ro_start = __pa((unsigned long)_text);
416         ro_end   = __pa((unsigned long)&data_start);
417         kernel_end  = __pa((unsigned long)&_end);
418 
419         end_paddr = start_paddr + size;
420 
421         pg_dir = pgd_offset_k(start_vaddr);
422 
423 #if PTRS_PER_PMD == 1
424         start_pmd = 0;
425 #else
426         start_pmd = ((start_vaddr >> PMD_SHIFT) & (PTRS_PER_PMD - 1));
427 #endif
428         start_pte = ((start_vaddr >> PAGE_SHIFT) & (PTRS_PER_PTE - 1));
429 
430         address = start_paddr;
431         vaddr = start_vaddr;
432         while (address < end_paddr) {
433 #if PTRS_PER_PMD == 1
434                 pmd = (pmd_t *)__pa(pg_dir);
435 #else
436                 pmd = (pmd_t *)pgd_address(*pg_dir);
437 
438                 /*
439                  * pmd is physical at this point
440                  */
441 
442                 if (!pmd) {
443                         pmd = (pmd_t *) get_memblock(PAGE_SIZE << PMD_ORDER);
444                         pmd = (pmd_t *) __pa(pmd);
445                 }
446 
447                 pgd_populate(NULL, pg_dir, __va(pmd));
448 #endif
449                 pg_dir++;
450 
451                 /* now change pmd to kernel virtual addresses */
452 
453                 pmd = (pmd_t *)__va(pmd) + start_pmd;
454                 for (tmp1 = start_pmd; tmp1 < PTRS_PER_PMD; tmp1++, pmd++) {
455 
456                         /*
457                          * pg_table is physical at this point
458                          */
459 
460                         pg_table = (pte_t *)pmd_address(*pmd);
461                         if (!pg_table) {
462                                 pg_table = (pte_t *) get_memblock(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 
515 void 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
549 void 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 
580 void *parisc_vmalloc_start __read_mostly;
581 EXPORT_SYMBOL(parisc_vmalloc_start);
582 
583 #ifdef CONFIG_PA11
584 unsigned long pcxl_dma_start __read_mostly;
585 #endif
586 
587 void __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 
653 unsigned long *empty_zero_page __read_mostly;
654 EXPORT_SYMBOL(empty_zero_page);
655 
656 void 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  */
713 static 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 = get_memblock(PAGE_SIZE);
741 }
742 
743 static 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 
763 void __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 
822 static unsigned long space_id[SID_ARRAY_SIZE] = { 1 }; /* disallow space 0 */
823 static unsigned long dirty_space_id[SID_ARRAY_SIZE];
824 static unsigned long space_id_index;
825 static unsigned long free_space_ids = NR_SPACE_IDS - 1;
826 static unsigned long dirty_space_ids = 0;
827 
828 static DEFINE_SPINLOCK(sid_lock);
829 
830 unsigned 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 
856 void 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
876 static 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 
894 static 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 
912 static 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 
939 static unsigned long recycle_ndirty;
940 static unsigned long recycle_dirty_array[SID_ARRAY_SIZE];
941 static unsigned int recycle_inuse;
942 
943 void 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
966 void 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
977 void free_initrd_mem(unsigned long start, unsigned long end)
978 {
979         free_reserved_area((void *)start, (void *)end, -1, "initrd");
980 }
981 #endif
982 

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