2 * linux/arch/parisc/mm/init.c
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)
14 #include <linux/module.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 */
27 #include <asm/pgalloc.h>
28 #include <asm/pgtable.h>
30 #include <asm/pdc_chassis.h>
31 #include <asm/mmzone.h>
32 #include <asm/sections.h>
34 extern int data_start
;
37 /* NOTE: This layout exactly conforms to the hybrid L2/L3 page table layout
38 * with the first pmd adjacent to the pgd and below it. gcc doesn't actually
39 * guarantee that global objects will be laid out in memory in the same order
40 * as the order of declaration, so put these in different sections and use
41 * the linker script to order them. */
42 pmd_t pmd0
[PTRS_PER_PMD
] __attribute__ ((__section__ (".data..vm0.pmd"), aligned(PAGE_SIZE
)));
45 pgd_t swapper_pg_dir
[PTRS_PER_PGD
] __attribute__ ((__section__ (".data..vm0.pgd"), aligned(PAGE_SIZE
)));
46 pte_t pg0
[PT_INITIAL
* PTRS_PER_PTE
] __attribute__ ((__section__ (".data..vm0.pte"), aligned(PAGE_SIZE
)));
48 #ifdef CONFIG_DISCONTIGMEM
49 struct node_map_data node_data
[MAX_NUMNODES
] __read_mostly
;
50 unsigned char pfnnid_map
[PFNNID_MAP_MAX
] __read_mostly
;
53 static struct resource data_resource
= {
54 .name
= "Kernel data",
55 .flags
= IORESOURCE_BUSY
| IORESOURCE_MEM
,
58 static struct resource code_resource
= {
59 .name
= "Kernel code",
60 .flags
= IORESOURCE_BUSY
| IORESOURCE_MEM
,
63 static struct resource pdcdata_resource
= {
64 .name
= "PDC data (Page Zero)",
67 .flags
= IORESOURCE_BUSY
| IORESOURCE_MEM
,
70 static struct resource sysram_resources
[MAX_PHYSMEM_RANGES
] __read_mostly
;
72 /* The following array is initialized from the firmware specific
73 * information retrieved in kernel/inventory.c.
76 physmem_range_t pmem_ranges
[MAX_PHYSMEM_RANGES
] __read_mostly
;
77 int npmem_ranges __read_mostly
;
80 #define MAX_MEM (~0UL)
81 #else /* !CONFIG_64BIT */
82 #define MAX_MEM (3584U*1024U*1024U)
83 #endif /* !CONFIG_64BIT */
85 static unsigned long mem_limit __read_mostly
= MAX_MEM
;
87 static void __init
mem_limit_func(void)
92 /* We need this before __setup() functions are called */
95 for (cp
= boot_command_line
; *cp
; ) {
96 if (memcmp(cp
, "mem=", 4) == 0) {
98 limit
= memparse(cp
, &end
);
103 while (*cp
!= ' ' && *cp
)
110 if (limit
< mem_limit
)
114 #define MAX_GAP (0x40000000UL >> PAGE_SHIFT)
116 static void __init
setup_bootmem(void)
118 unsigned long bootmap_size
;
119 unsigned long mem_max
;
120 unsigned long bootmap_pages
;
121 unsigned long bootmap_start_pfn
;
122 unsigned long bootmap_pfn
;
123 #ifndef CONFIG_DISCONTIGMEM
124 physmem_range_t pmem_holes
[MAX_PHYSMEM_RANGES
- 1];
127 int i
, sysram_resource_count
;
129 disable_sr_hashing(); /* Turn off space register hashing */
132 * Sort the ranges. Since the number of ranges is typically
133 * small, and performance is not an issue here, just do
134 * a simple insertion sort.
137 for (i
= 1; i
< npmem_ranges
; i
++) {
140 for (j
= i
; j
> 0; j
--) {
143 if (pmem_ranges
[j
-1].start_pfn
<
144 pmem_ranges
[j
].start_pfn
) {
148 tmp
= pmem_ranges
[j
-1].start_pfn
;
149 pmem_ranges
[j
-1].start_pfn
= pmem_ranges
[j
].start_pfn
;
150 pmem_ranges
[j
].start_pfn
= tmp
;
151 tmp
= pmem_ranges
[j
-1].pages
;
152 pmem_ranges
[j
-1].pages
= pmem_ranges
[j
].pages
;
153 pmem_ranges
[j
].pages
= tmp
;
157 #ifndef CONFIG_DISCONTIGMEM
159 * Throw out ranges that are too far apart (controlled by
163 for (i
= 1; i
< npmem_ranges
; i
++) {
164 if (pmem_ranges
[i
].start_pfn
-
165 (pmem_ranges
[i
-1].start_pfn
+
166 pmem_ranges
[i
-1].pages
) > MAX_GAP
) {
168 printk("Large gap in memory detected (%ld pages). "
169 "Consider turning on CONFIG_DISCONTIGMEM\n",
170 pmem_ranges
[i
].start_pfn
-
171 (pmem_ranges
[i
-1].start_pfn
+
172 pmem_ranges
[i
-1].pages
));
178 if (npmem_ranges
> 1) {
180 /* Print the memory ranges */
182 printk(KERN_INFO
"Memory Ranges:\n");
184 for (i
= 0; i
< npmem_ranges
; i
++) {
188 size
= (pmem_ranges
[i
].pages
<< PAGE_SHIFT
);
189 start
= (pmem_ranges
[i
].start_pfn
<< PAGE_SHIFT
);
190 printk(KERN_INFO
"%2d) Start 0x%016lx End 0x%016lx Size %6ld MB\n",
191 i
,start
, start
+ (size
- 1), size
>> 20);
195 sysram_resource_count
= npmem_ranges
;
196 for (i
= 0; i
< sysram_resource_count
; i
++) {
197 struct resource
*res
= &sysram_resources
[i
];
198 res
->name
= "System RAM";
199 res
->start
= pmem_ranges
[i
].start_pfn
<< PAGE_SHIFT
;
200 res
->end
= res
->start
+ (pmem_ranges
[i
].pages
<< PAGE_SHIFT
)-1;
201 res
->flags
= IORESOURCE_MEM
| IORESOURCE_BUSY
;
202 request_resource(&iomem_resource
, res
);
206 * For 32 bit kernels we limit the amount of memory we can
207 * support, in order to preserve enough kernel address space
208 * for other purposes. For 64 bit kernels we don't normally
209 * limit the memory, but this mechanism can be used to
210 * artificially limit the amount of memory (and it is written
211 * to work with multiple memory ranges).
214 mem_limit_func(); /* check for "mem=" argument */
218 for (i
= 0; i
< npmem_ranges
; i
++) {
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
)
227 pmem_ranges
[i
].pages
= (mem_limit
>> PAGE_SHIFT
)
228 - (mem_max
>> PAGE_SHIFT
);
229 npmem_ranges
= i
+ 1;
232 num_physpages
+= pmem_ranges
[i
].pages
;
235 num_physpages
+= pmem_ranges
[i
].pages
;
239 printk(KERN_INFO
"Total Memory: %ld MB\n",mem_max
>> 20);
241 #ifndef CONFIG_DISCONTIGMEM
242 /* Merge the ranges, keeping track of the holes */
245 unsigned long end_pfn
;
246 unsigned long hole_pages
;
249 end_pfn
= pmem_ranges
[0].start_pfn
+ pmem_ranges
[0].pages
;
250 for (i
= 1; i
< npmem_ranges
; i
++) {
252 hole_pages
= pmem_ranges
[i
].start_pfn
- end_pfn
;
254 pmem_holes
[npmem_holes
].start_pfn
= end_pfn
;
255 pmem_holes
[npmem_holes
++].pages
= hole_pages
;
256 end_pfn
+= hole_pages
;
258 end_pfn
+= pmem_ranges
[i
].pages
;
261 pmem_ranges
[0].pages
= end_pfn
- pmem_ranges
[0].start_pfn
;
267 for (i
= 0; i
< npmem_ranges
; i
++)
268 bootmap_pages
+= bootmem_bootmap_pages(pmem_ranges
[i
].pages
);
270 bootmap_start_pfn
= PAGE_ALIGN(__pa((unsigned long) &_end
)) >> PAGE_SHIFT
;
272 #ifdef CONFIG_DISCONTIGMEM
273 for (i
= 0; i
< MAX_PHYSMEM_RANGES
; i
++) {
274 memset(NODE_DATA(i
), 0, sizeof(pg_data_t
));
275 NODE_DATA(i
)->bdata
= &bootmem_node_data
[i
];
277 memset(pfnnid_map
, 0xff, sizeof(pfnnid_map
));
279 for (i
= 0; i
< npmem_ranges
; i
++) {
280 node_set_state(i
, N_NORMAL_MEMORY
);
286 * Initialize and free the full range of memory in each range.
287 * Note that the only writing these routines do are to the bootmap,
288 * and we've made sure to locate the bootmap properly so that they
289 * won't be writing over anything important.
292 bootmap_pfn
= bootmap_start_pfn
;
294 for (i
= 0; i
< npmem_ranges
; i
++) {
295 unsigned long start_pfn
;
296 unsigned long npages
;
298 start_pfn
= pmem_ranges
[i
].start_pfn
;
299 npages
= pmem_ranges
[i
].pages
;
301 bootmap_size
= init_bootmem_node(NODE_DATA(i
),
304 (start_pfn
+ npages
) );
305 free_bootmem_node(NODE_DATA(i
),
306 (start_pfn
<< PAGE_SHIFT
),
307 (npages
<< PAGE_SHIFT
) );
308 bootmap_pfn
+= (bootmap_size
+ PAGE_SIZE
- 1) >> PAGE_SHIFT
;
309 if ((start_pfn
+ npages
) > max_pfn
)
310 max_pfn
= start_pfn
+ npages
;
313 /* IOMMU is always used to access "high mem" on those boxes
314 * that can support enough mem that a PCI device couldn't
315 * directly DMA to any physical addresses.
316 * ISA DMA support will need to revisit this.
318 max_low_pfn
= max_pfn
;
320 /* bootmap sizing messed up? */
321 BUG_ON((bootmap_pfn
- bootmap_start_pfn
) != bootmap_pages
);
323 /* reserve PAGE0 pdc memory, kernel text/data/bss & bootmap */
325 #define PDC_CONSOLE_IO_IODC_SIZE 32768
327 reserve_bootmem_node(NODE_DATA(0), 0UL,
328 (unsigned long)(PAGE0
->mem_free
+
329 PDC_CONSOLE_IO_IODC_SIZE
), BOOTMEM_DEFAULT
);
330 reserve_bootmem_node(NODE_DATA(0), __pa((unsigned long)_text
),
331 (unsigned long)(_end
- _text
), BOOTMEM_DEFAULT
);
332 reserve_bootmem_node(NODE_DATA(0), (bootmap_start_pfn
<< PAGE_SHIFT
),
333 ((bootmap_pfn
- bootmap_start_pfn
) << PAGE_SHIFT
),
336 #ifndef CONFIG_DISCONTIGMEM
338 /* reserve the holes */
340 for (i
= 0; i
< npmem_holes
; i
++) {
341 reserve_bootmem_node(NODE_DATA(0),
342 (pmem_holes
[i
].start_pfn
<< PAGE_SHIFT
),
343 (pmem_holes
[i
].pages
<< PAGE_SHIFT
),
348 #ifdef CONFIG_BLK_DEV_INITRD
350 printk(KERN_INFO
"initrd: %08lx-%08lx\n", initrd_start
, initrd_end
);
351 if (__pa(initrd_start
) < mem_max
) {
352 unsigned long initrd_reserve
;
354 if (__pa(initrd_end
) > mem_max
) {
355 initrd_reserve
= mem_max
- __pa(initrd_start
);
357 initrd_reserve
= initrd_end
- initrd_start
;
359 initrd_below_start_ok
= 1;
360 printk(KERN_INFO
"initrd: reserving %08lx-%08lx (mem_max %08lx)\n", __pa(initrd_start
), __pa(initrd_start
) + initrd_reserve
, mem_max
);
362 reserve_bootmem_node(NODE_DATA(0), __pa(initrd_start
),
363 initrd_reserve
, BOOTMEM_DEFAULT
);
368 data_resource
.start
= virt_to_phys(&data_start
);
369 data_resource
.end
= virt_to_phys(_end
) - 1;
370 code_resource
.start
= virt_to_phys(_text
);
371 code_resource
.end
= virt_to_phys(&data_start
)-1;
373 /* We don't know which region the kernel will be in, so try
376 for (i
= 0; i
< sysram_resource_count
; i
++) {
377 struct resource
*res
= &sysram_resources
[i
];
378 request_resource(res
, &code_resource
);
379 request_resource(res
, &data_resource
);
381 request_resource(&sysram_resources
[0], &pdcdata_resource
);
384 static void __init
map_pages(unsigned long start_vaddr
,
385 unsigned long start_paddr
, unsigned long size
,
386 pgprot_t pgprot
, int force
)
391 unsigned long end_paddr
;
392 unsigned long start_pmd
;
393 unsigned long start_pte
;
396 unsigned long address
;
398 unsigned long ro_start
;
399 unsigned long ro_end
;
400 unsigned long fv_addr
;
401 unsigned long gw_addr
;
402 extern const unsigned long fault_vector_20
;
403 extern void * const linux_gateway_page
;
405 ro_start
= __pa((unsigned long)_text
);
406 ro_end
= __pa((unsigned long)&data_start
);
407 fv_addr
= __pa((unsigned long)&fault_vector_20
) & PAGE_MASK
;
408 gw_addr
= __pa((unsigned long)&linux_gateway_page
) & PAGE_MASK
;
410 end_paddr
= start_paddr
+ size
;
412 pg_dir
= pgd_offset_k(start_vaddr
);
414 #if PTRS_PER_PMD == 1
417 start_pmd
= ((start_vaddr
>> PMD_SHIFT
) & (PTRS_PER_PMD
- 1));
419 start_pte
= ((start_vaddr
>> PAGE_SHIFT
) & (PTRS_PER_PTE
- 1));
421 address
= start_paddr
;
423 while (address
< end_paddr
) {
424 #if PTRS_PER_PMD == 1
425 pmd
= (pmd_t
*)__pa(pg_dir
);
427 pmd
= (pmd_t
*)pgd_address(*pg_dir
);
430 * pmd is physical at this point
434 pmd
= (pmd_t
*) alloc_bootmem_low_pages_node(NODE_DATA(0), PAGE_SIZE
<< PMD_ORDER
);
435 pmd
= (pmd_t
*) __pa(pmd
);
438 pgd_populate(NULL
, pg_dir
, __va(pmd
));
442 /* now change pmd to kernel virtual addresses */
444 pmd
= (pmd_t
*)__va(pmd
) + start_pmd
;
445 for (tmp1
= start_pmd
; tmp1
< PTRS_PER_PMD
; tmp1
++, pmd
++) {
448 * pg_table is physical at this point
451 pg_table
= (pte_t
*)pmd_address(*pmd
);
454 alloc_bootmem_low_pages_node(NODE_DATA(0), PAGE_SIZE
);
455 pg_table
= (pte_t
*) __pa(pg_table
);
458 pmd_populate_kernel(NULL
, pmd
, __va(pg_table
));
460 /* now change pg_table to kernel virtual addresses */
462 pg_table
= (pte_t
*) __va(pg_table
) + start_pte
;
463 for (tmp2
= start_pte
; tmp2
< PTRS_PER_PTE
; tmp2
++, pg_table
++) {
467 * Map the fault vector writable so we can
468 * write the HPMC checksum.
471 pte
= __mk_pte(address
, pgprot
);
472 else if (core_kernel_text(vaddr
) &&
474 pte
= __mk_pte(address
, PAGE_KERNEL_EXEC
);
476 #if defined(CONFIG_PARISC_PAGE_SIZE_4KB)
477 if (address
>= ro_start
&& address
< ro_end
478 && address
!= fv_addr
479 && address
!= gw_addr
)
480 pte
= __mk_pte(address
, PAGE_KERNEL_RO
);
483 pte
= __mk_pte(address
, pgprot
);
485 if (address
>= end_paddr
) {
492 set_pte(pg_table
, pte
);
494 address
+= PAGE_SIZE
;
499 if (address
>= end_paddr
)
506 void free_initmem(void)
508 unsigned long init_begin
= (unsigned long)__init_begin
;
509 unsigned long init_end
= (unsigned long)__init_end
;
511 /* The init text pages are marked R-X. We have to
512 * flush the icache and mark them RW-
514 * This is tricky, because map_pages is in the init section.
515 * Do a dummy remap of the data section first (the data
516 * section is already PAGE_KERNEL) to pull in the TLB entries
518 map_pages(init_begin
, __pa(init_begin
), init_end
- init_begin
,
520 /* now remap at PAGE_KERNEL since the TLB is pre-primed to execute
522 map_pages(init_begin
, __pa(init_begin
), init_end
- init_begin
,
525 /* force the kernel to see the new TLB entries */
526 __flush_tlb_range(0, init_begin
, init_end
);
527 /* Attempt to catch anyone trying to execute code here
528 * by filling the page with BRK insns.
530 memset((void *)init_begin
, 0x00, init_end
- init_begin
);
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
);
535 num_physpages
+= free_initmem_default(0);
537 /* set up a new led state on systems shipped LED State panel */
538 pdc_chassis_send_status(PDC_CHASSIS_DIRECT_BCOMPLETE
);
542 #ifdef CONFIG_DEBUG_RODATA
543 void mark_rodata_ro(void)
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);
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).
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.
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
568 #define MAP_START (KERNEL_MAP_START)
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)))
574 void *parisc_vmalloc_start __read_mostly
;
575 EXPORT_SYMBOL(parisc_vmalloc_start
);
578 unsigned long pcxl_dma_start __read_mostly
;
581 void __init
mem_init(void)
583 int codesize
, reservedpages
, datasize
, initsize
;
585 /* Do sanity checks on page table constants */
586 BUILD_BUG_ON(PTE_ENTRY_SIZE
!= sizeof(pte_t
));
587 BUILD_BUG_ON(PMD_ENTRY_SIZE
!= sizeof(pmd_t
));
588 BUILD_BUG_ON(PGD_ENTRY_SIZE
!= sizeof(pgd_t
));
589 BUILD_BUG_ON(PAGE_SHIFT
+ BITS_PER_PTE
+ BITS_PER_PMD
+ BITS_PER_PGD
592 high_memory
= __va((max_pfn
<< PAGE_SHIFT
));
594 #ifndef CONFIG_DISCONTIGMEM
595 max_mapnr
= page_to_pfn(virt_to_page(high_memory
- 1)) + 1;
596 totalram_pages
+= free_all_bootmem();
601 for (i
= 0; i
< npmem_ranges
; i
++)
602 totalram_pages
+= free_all_bootmem_node(NODE_DATA(i
));
606 codesize
= (unsigned long)_etext
- (unsigned long)_text
;
607 datasize
= (unsigned long)_edata
- (unsigned long)_etext
;
608 initsize
= (unsigned long)__init_end
- (unsigned long)__init_begin
;
613 #ifdef CONFIG_DISCONTIGMEM
616 for (i
= 0; i
< npmem_ranges
; i
++) {
617 for (pfn
= node_start_pfn(i
); pfn
< node_end_pfn(i
); pfn
++) {
618 if (PageReserved(pfn_to_page(pfn
)))
622 #else /* !CONFIG_DISCONTIGMEM */
623 for (pfn
= 0; pfn
< max_pfn
; pfn
++) {
625 * Only count reserved RAM pages
627 if (PageReserved(pfn_to_page(pfn
)))
634 if (hppa_dma_ops
== &pcxl_dma_ops
) {
635 pcxl_dma_start
= (unsigned long)SET_MAP_OFFSET(MAP_START
);
636 parisc_vmalloc_start
= SET_MAP_OFFSET(pcxl_dma_start
637 + PCXL_DMA_MAP_SIZE
);
640 parisc_vmalloc_start
= SET_MAP_OFFSET(MAP_START
);
643 parisc_vmalloc_start
= SET_MAP_OFFSET(MAP_START
);
646 printk(KERN_INFO
"Memory: %luk/%luk available (%dk kernel code, %dk reserved, %dk data, %dk init)\n",
647 nr_free_pages() << (PAGE_SHIFT
-10),
648 num_physpages
<< (PAGE_SHIFT
-10),
650 reservedpages
<< (PAGE_SHIFT
-10),
655 #ifdef CONFIG_DEBUG_KERNEL /* double-sanity-check paranoia */
656 printk("virtual kernel memory layout:\n"
657 " vmalloc : 0x%p - 0x%p (%4ld MB)\n"
658 " memory : 0x%p - 0x%p (%4ld MB)\n"
659 " .init : 0x%p - 0x%p (%4ld kB)\n"
660 " .data : 0x%p - 0x%p (%4ld kB)\n"
661 " .text : 0x%p - 0x%p (%4ld kB)\n",
663 (void*)VMALLOC_START
, (void*)VMALLOC_END
,
664 (VMALLOC_END
- VMALLOC_START
) >> 20,
666 __va(0), high_memory
,
667 ((unsigned long)high_memory
- (unsigned long)__va(0)) >> 20,
669 __init_begin
, __init_end
,
670 ((unsigned long)__init_end
- (unsigned long)__init_begin
) >> 10,
673 ((unsigned long)_edata
- (unsigned long)_etext
) >> 10,
676 ((unsigned long)_etext
- (unsigned long)_text
) >> 10);
680 unsigned long *empty_zero_page __read_mostly
;
681 EXPORT_SYMBOL(empty_zero_page
);
683 void show_mem(unsigned int filter
)
685 int i
,free
= 0,total
= 0,reserved
= 0;
686 int shared
= 0, cached
= 0;
688 printk(KERN_INFO
"Mem-info:\n");
689 show_free_areas(filter
);
690 if (filter
& SHOW_MEM_FILTER_PAGE_COUNT
)
692 #ifndef CONFIG_DISCONTIGMEM
696 if (PageReserved(mem_map
+i
))
698 else if (PageSwapCache(mem_map
+i
))
700 else if (!page_count(&mem_map
[i
]))
703 shared
+= page_count(&mem_map
[i
]) - 1;
706 for (i
= 0; i
< npmem_ranges
; i
++) {
709 for (j
= node_start_pfn(i
); j
< node_end_pfn(i
); j
++) {
713 pgdat_resize_lock(NODE_DATA(i
), &flags
);
714 p
= nid_page_nr(i
, j
) - node_start_pfn(i
);
719 else if (PageSwapCache(p
))
721 else if (!page_count(p
))
724 shared
+= page_count(p
) - 1;
725 pgdat_resize_unlock(NODE_DATA(i
), &flags
);
729 printk(KERN_INFO
"%d pages of RAM\n", total
);
730 printk(KERN_INFO
"%d reserved pages\n", reserved
);
731 printk(KERN_INFO
"%d pages shared\n", shared
);
732 printk(KERN_INFO
"%d pages swap cached\n", cached
);
735 #ifdef CONFIG_DISCONTIGMEM
740 for (i
= 0; i
< npmem_ranges
; i
++) {
741 zl
= node_zonelist(i
, 0);
742 for (j
= 0; j
< MAX_NR_ZONES
; j
++) {
746 printk("Zone list for zone %d on node %d: ", j
, i
);
747 for_each_zone_zonelist(zone
, z
, zl
, j
)
748 printk("[%d/%s] ", zone_to_nid(zone
),
758 * pagetable_init() sets up the page tables
760 * Note that gateway_init() places the Linux gateway page at page 0.
761 * Since gateway pages cannot be dereferenced this has the desirable
762 * side effect of trapping those pesky NULL-reference errors in the
765 static void __init
pagetable_init(void)
769 /* Map each physical memory range to its kernel vaddr */
771 for (range
= 0; range
< npmem_ranges
; range
++) {
772 unsigned long start_paddr
;
773 unsigned long end_paddr
;
776 start_paddr
= pmem_ranges
[range
].start_pfn
<< PAGE_SHIFT
;
777 end_paddr
= start_paddr
+ (pmem_ranges
[range
].pages
<< PAGE_SHIFT
);
778 size
= pmem_ranges
[range
].pages
<< PAGE_SHIFT
;
780 map_pages((unsigned long)__va(start_paddr
), start_paddr
,
781 size
, PAGE_KERNEL
, 0);
784 #ifdef CONFIG_BLK_DEV_INITRD
785 if (initrd_end
&& initrd_end
> mem_limit
) {
786 printk(KERN_INFO
"initrd: mapping %08lx-%08lx\n", initrd_start
, initrd_end
);
787 map_pages(initrd_start
, __pa(initrd_start
),
788 initrd_end
- initrd_start
, PAGE_KERNEL
, 0);
792 empty_zero_page
= alloc_bootmem_pages(PAGE_SIZE
);
793 memset(empty_zero_page
, 0, PAGE_SIZE
);
796 static void __init
gateway_init(void)
798 unsigned long linux_gateway_page_addr
;
799 /* FIXME: This is 'const' in order to trick the compiler
800 into not treating it as DP-relative data. */
801 extern void * const linux_gateway_page
;
803 linux_gateway_page_addr
= LINUX_GATEWAY_ADDR
& PAGE_MASK
;
806 * Setup Linux Gateway page.
808 * The Linux gateway page will reside in kernel space (on virtual
809 * page 0), so it doesn't need to be aliased into user space.
812 map_pages(linux_gateway_page_addr
, __pa(&linux_gateway_page
),
813 PAGE_SIZE
, PAGE_GATEWAY
, 1);
818 map_hpux_gateway_page(struct task_struct
*tsk
, struct mm_struct
*mm
)
823 unsigned long start_pmd
;
824 unsigned long start_pte
;
825 unsigned long address
;
826 unsigned long hpux_gw_page_addr
;
827 /* FIXME: This is 'const' in order to trick the compiler
828 into not treating it as DP-relative data. */
829 extern void * const hpux_gateway_page
;
831 hpux_gw_page_addr
= HPUX_GATEWAY_ADDR
& PAGE_MASK
;
834 * Setup HP-UX Gateway page.
836 * The HP-UX gateway page resides in the user address space,
837 * so it needs to be aliased into each process.
840 pg_dir
= pgd_offset(mm
,hpux_gw_page_addr
);
842 #if PTRS_PER_PMD == 1
845 start_pmd
= ((hpux_gw_page_addr
>> PMD_SHIFT
) & (PTRS_PER_PMD
- 1));
847 start_pte
= ((hpux_gw_page_addr
>> PAGE_SHIFT
) & (PTRS_PER_PTE
- 1));
849 address
= __pa(&hpux_gateway_page
);
850 #if PTRS_PER_PMD == 1
851 pmd
= (pmd_t
*)__pa(pg_dir
);
853 pmd
= (pmd_t
*) pgd_address(*pg_dir
);
856 * pmd is physical at this point
860 pmd
= (pmd_t
*) get_zeroed_page(GFP_KERNEL
);
861 pmd
= (pmd_t
*) __pa(pmd
);
864 __pgd_val_set(*pg_dir
, PxD_FLAG_PRESENT
| PxD_FLAG_VALID
| (unsigned long) pmd
);
866 /* now change pmd to kernel virtual addresses */
868 pmd
= (pmd_t
*)__va(pmd
) + start_pmd
;
871 * pg_table is physical at this point
874 pg_table
= (pte_t
*) pmd_address(*pmd
);
876 pg_table
= (pte_t
*) __pa(get_zeroed_page(GFP_KERNEL
));
878 __pmd_val_set(*pmd
, PxD_FLAG_PRESENT
| PxD_FLAG_VALID
| (unsigned long) pg_table
);
880 /* now change pg_table to kernel virtual addresses */
882 pg_table
= (pte_t
*) __va(pg_table
) + start_pte
;
883 set_pte(pg_table
, __mk_pte(address
, PAGE_GATEWAY
));
885 EXPORT_SYMBOL(map_hpux_gateway_page
);
888 void __init
paging_init(void)
895 flush_cache_all_local(); /* start with known state */
896 flush_tlb_all_local(NULL
);
898 for (i
= 0; i
< npmem_ranges
; i
++) {
899 unsigned long zones_size
[MAX_NR_ZONES
] = { 0, };
901 zones_size
[ZONE_NORMAL
] = pmem_ranges
[i
].pages
;
903 #ifdef CONFIG_DISCONTIGMEM
904 /* Need to initialize the pfnnid_map before we can initialize
908 for (j
= (pmem_ranges
[i
].start_pfn
>> PFNNID_SHIFT
);
909 j
<= ((pmem_ranges
[i
].start_pfn
+ pmem_ranges
[i
].pages
) >> PFNNID_SHIFT
);
916 free_area_init_node(i
, zones_size
,
917 pmem_ranges
[i
].start_pfn
, NULL
);
924 * Currently, all PA20 chips have 18 bit protection IDs, which is the
925 * limiting factor (space ids are 32 bits).
928 #define NR_SPACE_IDS 262144
933 * Currently we have a one-to-one relationship between space IDs and
934 * protection IDs. Older parisc chips (PCXS, PCXT, PCXL, PCXL2) only
935 * support 15 bit protection IDs, so that is the limiting factor.
936 * PCXT' has 18 bit protection IDs, but only 16 bit spaceids, so it's
937 * probably not worth the effort for a special case here.
940 #define NR_SPACE_IDS 32768
942 #endif /* !CONFIG_PA20 */
944 #define RECYCLE_THRESHOLD (NR_SPACE_IDS / 2)
945 #define SID_ARRAY_SIZE (NR_SPACE_IDS / (8 * sizeof(long)))
947 static unsigned long space_id
[SID_ARRAY_SIZE
] = { 1 }; /* disallow space 0 */
948 static unsigned long dirty_space_id
[SID_ARRAY_SIZE
];
949 static unsigned long space_id_index
;
950 static unsigned long free_space_ids
= NR_SPACE_IDS
- 1;
951 static unsigned long dirty_space_ids
= 0;
953 static DEFINE_SPINLOCK(sid_lock
);
955 unsigned long alloc_sid(void)
959 spin_lock(&sid_lock
);
961 if (free_space_ids
== 0) {
962 if (dirty_space_ids
!= 0) {
963 spin_unlock(&sid_lock
);
964 flush_tlb_all(); /* flush_tlb_all() calls recycle_sids() */
965 spin_lock(&sid_lock
);
967 BUG_ON(free_space_ids
== 0);
972 index
= find_next_zero_bit(space_id
, NR_SPACE_IDS
, space_id_index
);
973 space_id
[index
>> SHIFT_PER_LONG
] |= (1L << (index
& (BITS_PER_LONG
- 1)));
974 space_id_index
= index
;
976 spin_unlock(&sid_lock
);
978 return index
<< SPACEID_SHIFT
;
981 void free_sid(unsigned long spaceid
)
983 unsigned long index
= spaceid
>> SPACEID_SHIFT
;
984 unsigned long *dirty_space_offset
;
986 dirty_space_offset
= dirty_space_id
+ (index
>> SHIFT_PER_LONG
);
987 index
&= (BITS_PER_LONG
- 1);
989 spin_lock(&sid_lock
);
991 BUG_ON(*dirty_space_offset
& (1L << index
)); /* attempt to free space id twice */
993 *dirty_space_offset
|= (1L << index
);
996 spin_unlock(&sid_lock
);
1001 static void get_dirty_sids(unsigned long *ndirtyptr
,unsigned long *dirty_array
)
1005 /* NOTE: sid_lock must be held upon entry */
1007 *ndirtyptr
= dirty_space_ids
;
1008 if (dirty_space_ids
!= 0) {
1009 for (i
= 0; i
< SID_ARRAY_SIZE
; i
++) {
1010 dirty_array
[i
] = dirty_space_id
[i
];
1011 dirty_space_id
[i
] = 0;
1013 dirty_space_ids
= 0;
1019 static void recycle_sids(unsigned long ndirty
,unsigned long *dirty_array
)
1023 /* NOTE: sid_lock must be held upon entry */
1026 for (i
= 0; i
< SID_ARRAY_SIZE
; i
++) {
1027 space_id
[i
] ^= dirty_array
[i
];
1030 free_space_ids
+= ndirty
;
1035 #else /* CONFIG_SMP */
1037 static void recycle_sids(void)
1041 /* NOTE: sid_lock must be held upon entry */
1043 if (dirty_space_ids
!= 0) {
1044 for (i
= 0; i
< SID_ARRAY_SIZE
; i
++) {
1045 space_id
[i
] ^= dirty_space_id
[i
];
1046 dirty_space_id
[i
] = 0;
1049 free_space_ids
+= dirty_space_ids
;
1050 dirty_space_ids
= 0;
1057 * flush_tlb_all() calls recycle_sids(), since whenever the entire tlb is
1058 * purged, we can safely reuse the space ids that were released but
1059 * not flushed from the tlb.
1064 static unsigned long recycle_ndirty
;
1065 static unsigned long recycle_dirty_array
[SID_ARRAY_SIZE
];
1066 static unsigned int recycle_inuse
;
1068 void flush_tlb_all(void)
1072 __inc_irq_stat(irq_tlb_count
);
1074 spin_lock(&sid_lock
);
1075 if (dirty_space_ids
> RECYCLE_THRESHOLD
) {
1076 BUG_ON(recycle_inuse
); /* FIXME: Use a semaphore/wait queue here */
1077 get_dirty_sids(&recycle_ndirty
,recycle_dirty_array
);
1081 spin_unlock(&sid_lock
);
1082 on_each_cpu(flush_tlb_all_local
, NULL
, 1);
1084 spin_lock(&sid_lock
);
1085 recycle_sids(recycle_ndirty
,recycle_dirty_array
);
1087 spin_unlock(&sid_lock
);
1091 void flush_tlb_all(void)
1093 __inc_irq_stat(irq_tlb_count
);
1094 spin_lock(&sid_lock
);
1095 flush_tlb_all_local(NULL
);
1097 spin_unlock(&sid_lock
);
1101 #ifdef CONFIG_BLK_DEV_INITRD
1102 void free_initrd_mem(unsigned long start
, unsigned long end
)
1104 num_physpages
+= free_reserved_area(start
, end
, 0, "initrd");