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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/gfp.h>
 18 #include <linux/delay.h>
 19 #include <linux/init.h>
 20 #include <linux/pci.h>          /* for hppa_dma_ops and pcxl_dma_ops */
 21 #include <linux/initrd.h>
 22 #include <linux/swap.h>
 23 #include <linux/unistd.h>
 24 #include <linux/nodemask.h>     /* for node_online_map */
 25 #include <linux/pagemap.h>      /* for release_pages and page_cache_release */
 26 
 27 #include <asm/pgalloc.h>
 28 #include <asm/pgtable.h>
 29 #include <asm/tlb.h>
 30 #include <asm/pdc_chassis.h>
 31 #include <asm/mmzone.h>
 32 #include <asm/sections.h>
 33 
 34 extern int  data_start;
 35 extern void parisc_kernel_start(void);  /* Kernel entry point in head.S */
 36 
 37 #if PT_NLEVELS == 3
 38 /* NOTE: This layout exactly conforms to the hybrid L2/L3 page table layout
 39  * with the first pmd adjacent to the pgd and below it. gcc doesn't actually
 40  * guarantee that global objects will be laid out in memory in the same order
 41  * as the order of declaration, so put these in different sections and use
 42  * the linker script to order them. */
 43 pmd_t pmd0[PTRS_PER_PMD] __attribute__ ((__section__ (".data..vm0.pmd"), aligned(PAGE_SIZE)));
 44 #endif
 45 
 46 pgd_t swapper_pg_dir[PTRS_PER_PGD] __attribute__ ((__section__ (".data..vm0.pgd"), aligned(PAGE_SIZE)));
 47 pte_t pg0[PT_INITIAL * PTRS_PER_PTE] __attribute__ ((__section__ (".data..vm0.pte"), aligned(PAGE_SIZE)));
 48 
 49 #ifdef CONFIG_DISCONTIGMEM
 50 struct node_map_data node_data[MAX_NUMNODES] __read_mostly;
 51 signed char pfnnid_map[PFNNID_MAP_MAX] __read_mostly;
 52 #endif
 53 
 54 static struct resource data_resource = {
 55         .name   = "Kernel data",
 56         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM,
 57 };
 58 
 59 static struct resource code_resource = {
 60         .name   = "Kernel code",
 61         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM,
 62 };
 63 
 64 static struct resource pdcdata_resource = {
 65         .name   = "PDC data (Page Zero)",
 66         .start  = 0,
 67         .end    = 0x9ff,
 68         .flags  = IORESOURCE_BUSY | IORESOURCE_MEM,
 69 };
 70 
 71 static struct resource sysram_resources[MAX_PHYSMEM_RANGES] __read_mostly;
 72 
 73 /* The following array is initialized from the firmware specific
 74  * information retrieved in kernel/inventory.c.
 75  */
 76 
 77 physmem_range_t pmem_ranges[MAX_PHYSMEM_RANGES] __read_mostly;
 78 int npmem_ranges __read_mostly;
 79 
 80 #ifdef CONFIG_64BIT
 81 #define MAX_MEM         (~0UL)
 82 #else /* !CONFIG_64BIT */
 83 #define MAX_MEM         (3584U*1024U*1024U)
 84 #endif /* !CONFIG_64BIT */
 85 
 86 static unsigned long mem_limit __read_mostly = MAX_MEM;
 87 
 88 static void __init mem_limit_func(void)
 89 {
 90         char *cp, *end;
 91         unsigned long limit;
 92 
 93         /* We need this before __setup() functions are called */
 94 
 95         limit = MAX_MEM;
 96         for (cp = boot_command_line; *cp; ) {
 97                 if (memcmp(cp, "mem=", 4) == 0) {
 98                         cp += 4;
 99                         limit = memparse(cp, &end);
100                         if (end != cp)
101                                 break;
102                         cp = end;
103                 } else {
104                         while (*cp != ' ' && *cp)
105                                 ++cp;
106                         while (*cp == ' ')
107                                 ++cp;
108                 }
109         }
110 
111         if (limit < mem_limit)
112                 mem_limit = limit;
113 }
114 
115 #define MAX_GAP (0x40000000UL >> PAGE_SHIFT)
116 
117 static void __init setup_bootmem(void)
118 {
119         unsigned long bootmap_size;
120         unsigned long mem_max;
121         unsigned long bootmap_pages;
122         unsigned long bootmap_start_pfn;
123         unsigned long bootmap_pfn;
124 #ifndef CONFIG_DISCONTIGMEM
125         physmem_range_t pmem_holes[MAX_PHYSMEM_RANGES - 1];
126         int npmem_holes;
127 #endif
128         int i, sysram_resource_count;
129 
130         disable_sr_hashing(); /* Turn off space register hashing */
131 
132         /*
133          * Sort the ranges. Since the number of ranges is typically
134          * small, and performance is not an issue here, just do
135          * a simple insertion sort.
136          */
137 
138         for (i = 1; i < npmem_ranges; i++) {
139                 int j;
140 
141                 for (j = i; j > 0; j--) {
142                         unsigned long tmp;
143 
144                         if (pmem_ranges[j-1].start_pfn <
145                             pmem_ranges[j].start_pfn) {
146 
147                                 break;
148                         }
149                         tmp = pmem_ranges[j-1].start_pfn;
150                         pmem_ranges[j-1].start_pfn = pmem_ranges[j].start_pfn;
151                         pmem_ranges[j].start_pfn = tmp;
152                         tmp = pmem_ranges[j-1].pages;
153                         pmem_ranges[j-1].pages = pmem_ranges[j].pages;
154                         pmem_ranges[j].pages = tmp;
155                 }
156         }
157 
158 #ifndef CONFIG_DISCONTIGMEM
159         /*
160          * Throw out ranges that are too far apart (controlled by
161          * MAX_GAP).
162          */
163 
164         for (i = 1; i < npmem_ranges; i++) {
165                 if (pmem_ranges[i].start_pfn -
166                         (pmem_ranges[i-1].start_pfn +
167                          pmem_ranges[i-1].pages) > MAX_GAP) {
168                         npmem_ranges = i;
169                         printk("Large gap in memory detected (%ld pages). "
170                                "Consider turning on CONFIG_DISCONTIGMEM\n",
171                                pmem_ranges[i].start_pfn -
172                                (pmem_ranges[i-1].start_pfn +
173                                 pmem_ranges[i-1].pages));
174                         break;
175                 }
176         }
177 #endif
178 
179         if (npmem_ranges > 1) {
180 
181                 /* Print the memory ranges */
182 
183                 printk(KERN_INFO "Memory Ranges:\n");
184 
185                 for (i = 0; i < npmem_ranges; i++) {
186                         unsigned long start;
187                         unsigned long size;
188 
189                         size = (pmem_ranges[i].pages << PAGE_SHIFT);
190                         start = (pmem_ranges[i].start_pfn << PAGE_SHIFT);
191                         printk(KERN_INFO "%2d) Start 0x%016lx End 0x%016lx Size %6ld MB\n",
192                                 i,start, start + (size - 1), size >> 20);
193                 }
194         }
195 
196         sysram_resource_count = npmem_ranges;
197         for (i = 0; i < sysram_resource_count; i++) {
198                 struct resource *res = &sysram_resources[i];
199                 res->name = "System RAM";
200                 res->start = pmem_ranges[i].start_pfn << PAGE_SHIFT;
201                 res->end = res->start + (pmem_ranges[i].pages << PAGE_SHIFT)-1;
202                 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
203                 request_resource(&iomem_resource, res);
204         }
205 
206         /*
207          * For 32 bit kernels we limit the amount of memory we can
208          * support, in order to preserve enough kernel address space
209          * for other purposes. For 64 bit kernels we don't normally
210          * limit the memory, but this mechanism can be used to
211          * artificially limit the amount of memory (and it is written
212          * to work with multiple memory ranges).
213          */
214 
215         mem_limit_func();       /* check for "mem=" argument */
216 
217         mem_max = 0;
218         for (i = 0; i < npmem_ranges; i++) {
219                 unsigned long rsize;
220 
221                 rsize = pmem_ranges[i].pages << PAGE_SHIFT;
222                 if ((mem_max + rsize) > mem_limit) {
223                         printk(KERN_WARNING "Memory truncated to %ld MB\n", mem_limit >> 20);
224                         if (mem_max == mem_limit)
225                                 npmem_ranges = i;
226                         else {
227                                 pmem_ranges[i].pages =   (mem_limit >> PAGE_SHIFT)
228                                                        - (mem_max >> PAGE_SHIFT);
229                                 npmem_ranges = i + 1;
230                                 mem_max = mem_limit;
231                         }
232                         break;
233                 }
234                 mem_max += rsize;
235         }
236 
237         printk(KERN_INFO "Total Memory: %ld MB\n",mem_max >> 20);
238 
239 #ifndef CONFIG_DISCONTIGMEM
240         /* Merge the ranges, keeping track of the holes */
241 
242         {
243                 unsigned long end_pfn;
244                 unsigned long hole_pages;
245 
246                 npmem_holes = 0;
247                 end_pfn = pmem_ranges[0].start_pfn + pmem_ranges[0].pages;
248                 for (i = 1; i < npmem_ranges; i++) {
249 
250                         hole_pages = pmem_ranges[i].start_pfn - end_pfn;
251                         if (hole_pages) {
252                                 pmem_holes[npmem_holes].start_pfn = end_pfn;
253                                 pmem_holes[npmem_holes++].pages = hole_pages;
254                                 end_pfn += hole_pages;
255                         }
256                         end_pfn += pmem_ranges[i].pages;
257                 }
258 
259                 pmem_ranges[0].pages = end_pfn - pmem_ranges[0].start_pfn;
260                 npmem_ranges = 1;
261         }
262 #endif
263 
264         bootmap_pages = 0;
265         for (i = 0; i < npmem_ranges; i++)
266                 bootmap_pages += bootmem_bootmap_pages(pmem_ranges[i].pages);
267 
268         bootmap_start_pfn = PAGE_ALIGN(__pa((unsigned long) &_end)) >> PAGE_SHIFT;
269 
270 #ifdef CONFIG_DISCONTIGMEM
271         for (i = 0; i < MAX_PHYSMEM_RANGES; i++) {
272                 memset(NODE_DATA(i), 0, sizeof(pg_data_t));
273                 NODE_DATA(i)->bdata = &bootmem_node_data[i];
274         }
275         memset(pfnnid_map, 0xff, sizeof(pfnnid_map));
276 
277         for (i = 0; i < npmem_ranges; i++) {
278                 node_set_state(i, N_NORMAL_MEMORY);
279                 node_set_online(i);
280         }
281 #endif
282 
283         /*
284          * Initialize and free the full range of memory in each range.
285          * Note that the only writing these routines do are to the bootmap,
286          * and we've made sure to locate the bootmap properly so that they
287          * won't be writing over anything important.
288          */
289 
290         bootmap_pfn = bootmap_start_pfn;
291         max_pfn = 0;
292         for (i = 0; i < npmem_ranges; i++) {
293                 unsigned long start_pfn;
294                 unsigned long npages;
295 
296                 start_pfn = pmem_ranges[i].start_pfn;
297                 npages = pmem_ranges[i].pages;
298 
299                 bootmap_size = init_bootmem_node(NODE_DATA(i),
300                                                 bootmap_pfn,
301                                                 start_pfn,
302                                                 (start_pfn + npages) );
303                 free_bootmem_node(NODE_DATA(i),
304                                   (start_pfn << PAGE_SHIFT),
305                                   (npages << PAGE_SHIFT) );
306                 bootmap_pfn += (bootmap_size + PAGE_SIZE - 1) >> PAGE_SHIFT;
307                 if ((start_pfn + npages) > max_pfn)
308                         max_pfn = start_pfn + npages;
309         }
310 
311         /* IOMMU is always used to access "high mem" on those boxes
312          * that can support enough mem that a PCI device couldn't
313          * directly DMA to any physical addresses.
314          * ISA DMA support will need to revisit this.
315          */
316         max_low_pfn = max_pfn;
317 
318         /* bootmap sizing messed up? */
319         BUG_ON((bootmap_pfn - bootmap_start_pfn) != bootmap_pages);
320 
321         /* reserve PAGE0 pdc memory, kernel text/data/bss & bootmap */
322 
323 #define PDC_CONSOLE_IO_IODC_SIZE 32768
324 
325         reserve_bootmem_node(NODE_DATA(0), 0UL,
326                         (unsigned long)(PAGE0->mem_free +
327                                 PDC_CONSOLE_IO_IODC_SIZE), BOOTMEM_DEFAULT);
328         reserve_bootmem_node(NODE_DATA(0), __pa(KERNEL_BINARY_TEXT_START),
329                         (unsigned long)(_end - KERNEL_BINARY_TEXT_START),
330                         BOOTMEM_DEFAULT);
331         reserve_bootmem_node(NODE_DATA(0), (bootmap_start_pfn << PAGE_SHIFT),
332                         ((bootmap_pfn - bootmap_start_pfn) << PAGE_SHIFT),
333                         BOOTMEM_DEFAULT);
334 
335 #ifndef CONFIG_DISCONTIGMEM
336 
337         /* reserve the holes */
338 
339         for (i = 0; i < npmem_holes; i++) {
340                 reserve_bootmem_node(NODE_DATA(0),
341                                 (pmem_holes[i].start_pfn << PAGE_SHIFT),
342                                 (pmem_holes[i].pages << PAGE_SHIFT),
343                                 BOOTMEM_DEFAULT);
344         }
345 #endif
346 
347 #ifdef CONFIG_BLK_DEV_INITRD
348         if (initrd_start) {
349                 printk(KERN_INFO "initrd: %08lx-%08lx\n", initrd_start, initrd_end);
350                 if (__pa(initrd_start) < mem_max) {
351                         unsigned long initrd_reserve;
352 
353                         if (__pa(initrd_end) > mem_max) {
354                                 initrd_reserve = mem_max - __pa(initrd_start);
355                         } else {
356                                 initrd_reserve = initrd_end - initrd_start;
357                         }
358                         initrd_below_start_ok = 1;
359                         printk(KERN_INFO "initrd: reserving %08lx-%08lx (mem_max %08lx)\n", __pa(initrd_start), __pa(initrd_start) + initrd_reserve, mem_max);
360 
361                         reserve_bootmem_node(NODE_DATA(0), __pa(initrd_start),
362                                         initrd_reserve, BOOTMEM_DEFAULT);
363                 }
364         }
365 #endif
366 
367         data_resource.start =  virt_to_phys(&data_start);
368         data_resource.end = virt_to_phys(_end) - 1;
369         code_resource.start = virt_to_phys(_text);
370         code_resource.end = virt_to_phys(&data_start)-1;
371 
372         /* We don't know which region the kernel will be in, so try
373          * all of them.
374          */
375         for (i = 0; i < sysram_resource_count; i++) {
376                 struct resource *res = &sysram_resources[i];
377                 request_resource(res, &code_resource);
378                 request_resource(res, &data_resource);
379         }
380         request_resource(&sysram_resources[0], &pdcdata_resource);
381 }
382 
383 static int __init parisc_text_address(unsigned long vaddr)
384 {
385         static unsigned long head_ptr __initdata;
386 
387         if (!head_ptr)
388                 head_ptr = PAGE_MASK & (unsigned long)
389                         dereference_function_descriptor(&parisc_kernel_start);
390 
391         return core_kernel_text(vaddr) || vaddr == head_ptr;
392 }
393 
394 static void __init map_pages(unsigned long start_vaddr,
395                              unsigned long start_paddr, unsigned long size,
396                              pgprot_t pgprot, int force)
397 {
398         pgd_t *pg_dir;
399         pmd_t *pmd;
400         pte_t *pg_table;
401         unsigned long end_paddr;
402         unsigned long start_pmd;
403         unsigned long start_pte;
404         unsigned long tmp1;
405         unsigned long tmp2;
406         unsigned long address;
407         unsigned long vaddr;
408         unsigned long ro_start;
409         unsigned long ro_end;
410         unsigned long fv_addr;
411         unsigned long gw_addr;
412         extern const unsigned long fault_vector_20;
413         extern void * const linux_gateway_page;
414 
415         ro_start = __pa((unsigned long)_text);
416         ro_end   = __pa((unsigned long)&data_start);
417         fv_addr  = __pa((unsigned long)&fault_vector_20) & PAGE_MASK;
418         gw_addr  = __pa((unsigned long)&linux_gateway_page) & PAGE_MASK;
419 
420         end_paddr = start_paddr + size;
421 
422         pg_dir = pgd_offset_k(start_vaddr);
423 
424 #if PTRS_PER_PMD == 1
425         start_pmd = 0;
426 #else
427         start_pmd = ((start_vaddr >> PMD_SHIFT) & (PTRS_PER_PMD - 1));
428 #endif
429         start_pte = ((start_vaddr >> PAGE_SHIFT) & (PTRS_PER_PTE - 1));
430 
431         address = start_paddr;
432         vaddr = start_vaddr;
433         while (address < end_paddr) {
434 #if PTRS_PER_PMD == 1
435                 pmd = (pmd_t *)__pa(pg_dir);
436 #else
437                 pmd = (pmd_t *)pgd_address(*pg_dir);
438 
439                 /*
440                  * pmd is physical at this point
441                  */
442 
443                 if (!pmd) {
444                         pmd = (pmd_t *) alloc_bootmem_low_pages_node(NODE_DATA(0), PAGE_SIZE << PMD_ORDER);
445                         pmd = (pmd_t *) __pa(pmd);
446                 }
447 
448                 pgd_populate(NULL, pg_dir, __va(pmd));
449 #endif
450                 pg_dir++;
451 
452                 /* now change pmd to kernel virtual addresses */
453 
454                 pmd = (pmd_t *)__va(pmd) + start_pmd;
455                 for (tmp1 = start_pmd; tmp1 < PTRS_PER_PMD; tmp1++, pmd++) {
456 
457                         /*
458                          * pg_table is physical at this point
459                          */
460 
461                         pg_table = (pte_t *)pmd_address(*pmd);
462                         if (!pg_table) {
463                                 pg_table = (pte_t *)
464                                         alloc_bootmem_low_pages_node(NODE_DATA(0), PAGE_SIZE);
465                                 pg_table = (pte_t *) __pa(pg_table);
466                         }
467 
468                         pmd_populate_kernel(NULL, pmd, __va(pg_table));
469 
470                         /* now change pg_table to kernel virtual addresses */
471 
472                         pg_table = (pte_t *) __va(pg_table) + start_pte;
473                         for (tmp2 = start_pte; tmp2 < PTRS_PER_PTE; tmp2++, pg_table++) {
474                                 pte_t pte;
475 
476                                 /*
477                                  * Map the fault vector writable so we can
478                                  * write the HPMC checksum.
479                                  */
480                                 if (force)
481                                         pte =  __mk_pte(address, pgprot);
482                                 else if (parisc_text_address(vaddr) &&
483                                          address != fv_addr)
484                                         pte = __mk_pte(address, PAGE_KERNEL_EXEC);
485                                 else
486 #if defined(CONFIG_PARISC_PAGE_SIZE_4KB)
487                                 if (address >= ro_start && address < ro_end
488                                                         && address != fv_addr
489                                                         && address != gw_addr)
490                                         pte = __mk_pte(address, PAGE_KERNEL_RO);
491                                 else
492 #endif
493                                         pte = __mk_pte(address, pgprot);
494 
495                                 if (address >= end_paddr) {
496                                         if (force)
497                                                 break;
498                                         else
499                                                 pte_val(pte) = 0;
500                                 }
501 
502                                 set_pte(pg_table, pte);
503 
504                                 address += PAGE_SIZE;
505                                 vaddr += PAGE_SIZE;
506                         }
507                         start_pte = 0;
508 
509                         if (address >= end_paddr)
510                             break;
511                 }
512                 start_pmd = 0;
513         }
514 }
515 
516 void free_initmem(void)
517 {
518         unsigned long init_begin = (unsigned long)__init_begin;
519         unsigned long init_end = (unsigned long)__init_end;
520 
521         /* The init text pages are marked R-X.  We have to
522          * flush the icache and mark them RW-
523          *
524          * This is tricky, because map_pages is in the init section.
525          * Do a dummy remap of the data section first (the data
526          * section is already PAGE_KERNEL) to pull in the TLB entries
527          * for map_kernel */
528         map_pages(init_begin, __pa(init_begin), init_end - init_begin,
529                   PAGE_KERNEL_RWX, 1);
530         /* now remap at PAGE_KERNEL since the TLB is pre-primed to execute
531          * map_pages */
532         map_pages(init_begin, __pa(init_begin), init_end - init_begin,
533                   PAGE_KERNEL, 1);
534 
535         /* force the kernel to see the new TLB entries */
536         __flush_tlb_range(0, init_begin, init_end);
537         /* Attempt to catch anyone trying to execute code here
538          * by filling the page with BRK insns.
539          */
540         memset((void *)init_begin, 0x00, init_end - init_begin);
541         /* finally dump all the instructions which were cached, since the
542          * pages are no-longer executable */
543         flush_icache_range(init_begin, init_end);
544         
545         free_initmem_default(-1);
546 
547         /* set up a new led state on systems shipped LED State panel */
548         pdc_chassis_send_status(PDC_CHASSIS_DIRECT_BCOMPLETE);
549 }
550 
551 
552 #ifdef CONFIG_DEBUG_RODATA
553 void mark_rodata_ro(void)
554 {
555         /* rodata memory was already mapped with KERNEL_RO access rights by
556            pagetable_init() and map_pages(). No need to do additional stuff here */
557         printk (KERN_INFO "Write protecting the kernel read-only data: %luk\n",
558                 (unsigned long)(__end_rodata - __start_rodata) >> 10);
559 }
560 #endif
561 
562 
563 /*
564  * Just an arbitrary offset to serve as a "hole" between mapping areas
565  * (between top of physical memory and a potential pcxl dma mapping
566  * area, and below the vmalloc mapping area).
567  *
568  * The current 32K value just means that there will be a 32K "hole"
569  * between mapping areas. That means that  any out-of-bounds memory
570  * accesses will hopefully be caught. The vmalloc() routines leaves
571  * a hole of 4kB between each vmalloced area for the same reason.
572  */
573 
574  /* Leave room for gateway page expansion */
575 #if KERNEL_MAP_START < GATEWAY_PAGE_SIZE
576 #error KERNEL_MAP_START is in gateway reserved region
577 #endif
578 #define MAP_START (KERNEL_MAP_START)
579 
580 #define VM_MAP_OFFSET  (32*1024)
581 #define SET_MAP_OFFSET(x) ((void *)(((unsigned long)(x) + VM_MAP_OFFSET) \
582                                      & ~(VM_MAP_OFFSET-1)))
583 
584 void *parisc_vmalloc_start __read_mostly;
585 EXPORT_SYMBOL(parisc_vmalloc_start);
586 
587 #ifdef CONFIG_PA11
588 unsigned long pcxl_dma_start __read_mostly;
589 #endif
590 
591 void __init mem_init(void)
592 {
593         /* Do sanity checks on page table constants */
594         BUILD_BUG_ON(PTE_ENTRY_SIZE != sizeof(pte_t));
595         BUILD_BUG_ON(PMD_ENTRY_SIZE != sizeof(pmd_t));
596         BUILD_BUG_ON(PGD_ENTRY_SIZE != sizeof(pgd_t));
597         BUILD_BUG_ON(PAGE_SHIFT + BITS_PER_PTE + BITS_PER_PMD + BITS_PER_PGD
598                         > BITS_PER_LONG);
599 
600         high_memory = __va((max_pfn << PAGE_SHIFT));
601         set_max_mapnr(page_to_pfn(virt_to_page(high_memory - 1)) + 1);
602         free_all_bootmem();
603 
604 #ifdef CONFIG_PA11
605         if (hppa_dma_ops == &pcxl_dma_ops) {
606                 pcxl_dma_start = (unsigned long)SET_MAP_OFFSET(MAP_START);
607                 parisc_vmalloc_start = SET_MAP_OFFSET(pcxl_dma_start
608                                                 + PCXL_DMA_MAP_SIZE);
609         } else {
610                 pcxl_dma_start = 0;
611                 parisc_vmalloc_start = SET_MAP_OFFSET(MAP_START);
612         }
613 #else
614         parisc_vmalloc_start = SET_MAP_OFFSET(MAP_START);
615 #endif
616 
617         mem_init_print_info(NULL);
618 #ifdef CONFIG_DEBUG_KERNEL /* double-sanity-check paranoia */
619         printk("virtual kernel memory layout:\n"
620                "    vmalloc : 0x%p - 0x%p   (%4ld MB)\n"
621                "    memory  : 0x%p - 0x%p   (%4ld MB)\n"
622                "      .init : 0x%p - 0x%p   (%4ld kB)\n"
623                "      .data : 0x%p - 0x%p   (%4ld kB)\n"
624                "      .text : 0x%p - 0x%p   (%4ld kB)\n",
625 
626                (void*)VMALLOC_START, (void*)VMALLOC_END,
627                (VMALLOC_END - VMALLOC_START) >> 20,
628 
629                __va(0), high_memory,
630                ((unsigned long)high_memory - (unsigned long)__va(0)) >> 20,
631 
632                __init_begin, __init_end,
633                ((unsigned long)__init_end - (unsigned long)__init_begin) >> 10,
634 
635                _etext, _edata,
636                ((unsigned long)_edata - (unsigned long)_etext) >> 10,
637 
638                _text, _etext,
639                ((unsigned long)_etext - (unsigned long)_text) >> 10);
640 #endif
641 }
642 
643 unsigned long *empty_zero_page __read_mostly;
644 EXPORT_SYMBOL(empty_zero_page);
645 
646 void show_mem(unsigned int filter)
647 {
648         int total = 0,reserved = 0;
649         pg_data_t *pgdat;
650 
651         printk(KERN_INFO "Mem-info:\n");
652         show_free_areas(filter);
653 
654         for_each_online_pgdat(pgdat) {
655                 unsigned long flags;
656                 int zoneid;
657 
658                 pgdat_resize_lock(pgdat, &flags);
659                 for (zoneid = 0; zoneid < MAX_NR_ZONES; zoneid++) {
660                         struct zone *zone = &pgdat->node_zones[zoneid];
661                         if (!populated_zone(zone))
662                                 continue;
663 
664                         total += zone->present_pages;
665                         reserved = zone->present_pages - zone->managed_pages;
666                 }
667                 pgdat_resize_unlock(pgdat, &flags);
668         }
669 
670         printk(KERN_INFO "%d pages of RAM\n", total);
671         printk(KERN_INFO "%d reserved pages\n", reserved);
672 
673 #ifdef CONFIG_DISCONTIGMEM
674         {
675                 struct zonelist *zl;
676                 int i, j;
677 
678                 for (i = 0; i < npmem_ranges; i++) {
679                         zl = node_zonelist(i, 0);
680                         for (j = 0; j < MAX_NR_ZONES; j++) {
681                                 struct zoneref *z;
682                                 struct zone *zone;
683 
684                                 printk("Zone list for zone %d on node %d: ", j, i);
685                                 for_each_zone_zonelist(zone, z, zl, j)
686                                         printk("[%d/%s] ", zone_to_nid(zone),
687                                                                 zone->name);
688                                 printk("\n");
689                         }
690                 }
691         }
692 #endif
693 }
694 
695 /*
696  * pagetable_init() sets up the page tables
697  *
698  * Note that gateway_init() places the Linux gateway page at page 0.
699  * Since gateway pages cannot be dereferenced this has the desirable
700  * side effect of trapping those pesky NULL-reference errors in the
701  * kernel.
702  */
703 static void __init pagetable_init(void)
704 {
705         int range;
706 
707         /* Map each physical memory range to its kernel vaddr */
708 
709         for (range = 0; range < npmem_ranges; range++) {
710                 unsigned long start_paddr;
711                 unsigned long end_paddr;
712                 unsigned long size;
713 
714                 start_paddr = pmem_ranges[range].start_pfn << PAGE_SHIFT;
715                 end_paddr = start_paddr + (pmem_ranges[range].pages << PAGE_SHIFT);
716                 size = pmem_ranges[range].pages << PAGE_SHIFT;
717 
718                 map_pages((unsigned long)__va(start_paddr), start_paddr,
719                           size, PAGE_KERNEL, 0);
720         }
721 
722 #ifdef CONFIG_BLK_DEV_INITRD
723         if (initrd_end && initrd_end > mem_limit) {
724                 printk(KERN_INFO "initrd: mapping %08lx-%08lx\n", initrd_start, initrd_end);
725                 map_pages(initrd_start, __pa(initrd_start),
726                           initrd_end - initrd_start, PAGE_KERNEL, 0);
727         }
728 #endif
729 
730         empty_zero_page = alloc_bootmem_pages(PAGE_SIZE);
731 }
732 
733 static void __init gateway_init(void)
734 {
735         unsigned long linux_gateway_page_addr;
736         /* FIXME: This is 'const' in order to trick the compiler
737            into not treating it as DP-relative data. */
738         extern void * const linux_gateway_page;
739 
740         linux_gateway_page_addr = LINUX_GATEWAY_ADDR & PAGE_MASK;
741 
742         /*
743          * Setup Linux Gateway page.
744          *
745          * The Linux gateway page will reside in kernel space (on virtual
746          * page 0), so it doesn't need to be aliased into user space.
747          */
748 
749         map_pages(linux_gateway_page_addr, __pa(&linux_gateway_page),
750                   PAGE_SIZE, PAGE_GATEWAY, 1);
751 }
752 
753 void __init paging_init(void)
754 {
755         int i;
756 
757         setup_bootmem();
758         pagetable_init();
759         gateway_init();
760         flush_cache_all_local(); /* start with known state */
761         flush_tlb_all_local(NULL);
762 
763         for (i = 0; i < npmem_ranges; i++) {
764                 unsigned long zones_size[MAX_NR_ZONES] = { 0, };
765 
766                 zones_size[ZONE_NORMAL] = pmem_ranges[i].pages;
767 
768 #ifdef CONFIG_DISCONTIGMEM
769                 /* Need to initialize the pfnnid_map before we can initialize
770                    the zone */
771                 {
772                     int j;
773                     for (j = (pmem_ranges[i].start_pfn >> PFNNID_SHIFT);
774                          j <= ((pmem_ranges[i].start_pfn + pmem_ranges[i].pages) >> PFNNID_SHIFT);
775                          j++) {
776                         pfnnid_map[j] = i;
777                     }
778                 }
779 #endif
780 
781                 free_area_init_node(i, zones_size,
782                                 pmem_ranges[i].start_pfn, NULL);
783         }
784 }
785 
786 #ifdef CONFIG_PA20
787 
788 /*
789  * Currently, all PA20 chips have 18 bit protection IDs, which is the
790  * limiting factor (space ids are 32 bits).
791  */
792 
793 #define NR_SPACE_IDS 262144
794 
795 #else
796 
797 /*
798  * Currently we have a one-to-one relationship between space IDs and
799  * protection IDs. Older parisc chips (PCXS, PCXT, PCXL, PCXL2) only
800  * support 15 bit protection IDs, so that is the limiting factor.
801  * PCXT' has 18 bit protection IDs, but only 16 bit spaceids, so it's
802  * probably not worth the effort for a special case here.
803  */
804 
805 #define NR_SPACE_IDS 32768
806 
807 #endif  /* !CONFIG_PA20 */
808 
809 #define RECYCLE_THRESHOLD (NR_SPACE_IDS / 2)
810 #define SID_ARRAY_SIZE  (NR_SPACE_IDS / (8 * sizeof(long)))
811 
812 static unsigned long space_id[SID_ARRAY_SIZE] = { 1 }; /* disallow space 0 */
813 static unsigned long dirty_space_id[SID_ARRAY_SIZE];
814 static unsigned long space_id_index;
815 static unsigned long free_space_ids = NR_SPACE_IDS - 1;
816 static unsigned long dirty_space_ids = 0;
817 
818 static DEFINE_SPINLOCK(sid_lock);
819 
820 unsigned long alloc_sid(void)
821 {
822         unsigned long index;
823 
824         spin_lock(&sid_lock);
825 
826         if (free_space_ids == 0) {
827                 if (dirty_space_ids != 0) {
828                         spin_unlock(&sid_lock);
829                         flush_tlb_all(); /* flush_tlb_all() calls recycle_sids() */
830                         spin_lock(&sid_lock);
831                 }
832                 BUG_ON(free_space_ids == 0);
833         }
834 
835         free_space_ids--;
836 
837         index = find_next_zero_bit(space_id, NR_SPACE_IDS, space_id_index);
838         space_id[index >> SHIFT_PER_LONG] |= (1L << (index & (BITS_PER_LONG - 1)));
839         space_id_index = index;
840 
841         spin_unlock(&sid_lock);
842 
843         return index << SPACEID_SHIFT;
844 }
845 
846 void free_sid(unsigned long spaceid)
847 {
848         unsigned long index = spaceid >> SPACEID_SHIFT;
849         unsigned long *dirty_space_offset;
850 
851         dirty_space_offset = dirty_space_id + (index >> SHIFT_PER_LONG);
852         index &= (BITS_PER_LONG - 1);
853 
854         spin_lock(&sid_lock);
855 
856         BUG_ON(*dirty_space_offset & (1L << index)); /* attempt to free space id twice */
857 
858         *dirty_space_offset |= (1L << index);
859         dirty_space_ids++;
860 
861         spin_unlock(&sid_lock);
862 }
863 
864 
865 #ifdef CONFIG_SMP
866 static void get_dirty_sids(unsigned long *ndirtyptr,unsigned long *dirty_array)
867 {
868         int i;
869 
870         /* NOTE: sid_lock must be held upon entry */
871 
872         *ndirtyptr = dirty_space_ids;
873         if (dirty_space_ids != 0) {
874             for (i = 0; i < SID_ARRAY_SIZE; i++) {
875                 dirty_array[i] = dirty_space_id[i];
876                 dirty_space_id[i] = 0;
877             }
878             dirty_space_ids = 0;
879         }
880 
881         return;
882 }
883 
884 static void recycle_sids(unsigned long ndirty,unsigned long *dirty_array)
885 {
886         int i;
887 
888         /* NOTE: sid_lock must be held upon entry */
889 
890         if (ndirty != 0) {
891                 for (i = 0; i < SID_ARRAY_SIZE; i++) {
892                         space_id[i] ^= dirty_array[i];
893                 }
894 
895                 free_space_ids += ndirty;
896                 space_id_index = 0;
897         }
898 }
899 
900 #else /* CONFIG_SMP */
901 
902 static void recycle_sids(void)
903 {
904         int i;
905 
906         /* NOTE: sid_lock must be held upon entry */
907 
908         if (dirty_space_ids != 0) {
909                 for (i = 0; i < SID_ARRAY_SIZE; i++) {
910                         space_id[i] ^= dirty_space_id[i];
911                         dirty_space_id[i] = 0;
912                 }
913 
914                 free_space_ids += dirty_space_ids;
915                 dirty_space_ids = 0;
916                 space_id_index = 0;
917         }
918 }
919 #endif
920 
921 /*
922  * flush_tlb_all() calls recycle_sids(), since whenever the entire tlb is
923  * purged, we can safely reuse the space ids that were released but
924  * not flushed from the tlb.
925  */
926 
927 #ifdef CONFIG_SMP
928 
929 static unsigned long recycle_ndirty;
930 static unsigned long recycle_dirty_array[SID_ARRAY_SIZE];
931 static unsigned int recycle_inuse;
932 
933 void flush_tlb_all(void)
934 {
935         int do_recycle;
936 
937         __inc_irq_stat(irq_tlb_count);
938         do_recycle = 0;
939         spin_lock(&sid_lock);
940         if (dirty_space_ids > RECYCLE_THRESHOLD) {
941             BUG_ON(recycle_inuse);  /* FIXME: Use a semaphore/wait queue here */
942             get_dirty_sids(&recycle_ndirty,recycle_dirty_array);
943             recycle_inuse++;
944             do_recycle++;
945         }
946         spin_unlock(&sid_lock);
947         on_each_cpu(flush_tlb_all_local, NULL, 1);
948         if (do_recycle) {
949             spin_lock(&sid_lock);
950             recycle_sids(recycle_ndirty,recycle_dirty_array);
951             recycle_inuse = 0;
952             spin_unlock(&sid_lock);
953         }
954 }
955 #else
956 void flush_tlb_all(void)
957 {
958         __inc_irq_stat(irq_tlb_count);
959         spin_lock(&sid_lock);
960         flush_tlb_all_local(NULL);
961         recycle_sids();
962         spin_unlock(&sid_lock);
963 }
964 #endif
965 
966 #ifdef CONFIG_BLK_DEV_INITRD
967 void free_initrd_mem(unsigned long start, unsigned long end)
968 {
969         free_reserved_area((void *)start, (void *)end, -1, "initrd");
970 }
971 #endif
972 

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