2 * linux/arch/sparc/mm/init.c
4 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
5 * Copyright (C) 1995 Eddie C. Dost (ecd@skynet.be)
6 * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
7 * Copyright (C) 2000 Anton Blanchard (anton@samba.org)
10 #include <linux/module.h>
11 #include <linux/signal.h>
12 #include <linux/sched.h>
13 #include <linux/kernel.h>
14 #include <linux/errno.h>
15 #include <linux/string.h>
16 #include <linux/types.h>
17 #include <linux/ptrace.h>
18 #include <linux/mman.h>
20 #include <linux/swap.h>
21 #include <linux/initrd.h>
22 #include <linux/init.h>
23 #include <linux/highmem.h>
24 #include <linux/bootmem.h>
25 #include <linux/pagemap.h>
26 #include <linux/poison.h>
27 #include <linux/gfp.h>
29 #include <asm/sections.h>
30 #include <asm/system.h>
31 #include <asm/vac-ops.h>
33 #include <asm/pgtable.h>
34 #include <asm/vaddrs.h>
35 #include <asm/pgalloc.h> /* bug in asm-generic/tlb.h: check_pgt_cache */
40 DEFINE_PER_CPU(struct mmu_gather
, mmu_gathers
);
42 unsigned long *sparc_valid_addr_bitmap
;
43 EXPORT_SYMBOL(sparc_valid_addr_bitmap
);
45 unsigned long phys_base
;
46 EXPORT_SYMBOL(phys_base
);
48 unsigned long pfn_base
;
49 EXPORT_SYMBOL(pfn_base
);
51 unsigned long page_kernel
;
52 EXPORT_SYMBOL(page_kernel
);
54 struct sparc_phys_banks sp_banks
[SPARC_PHYS_BANKS
+1];
55 unsigned long sparc_unmapped_base
;
57 struct pgtable_cache_struct pgt_quicklists
;
59 /* Initial ramdisk setup */
60 extern unsigned int sparc_ramdisk_image
;
61 extern unsigned int sparc_ramdisk_size
;
63 unsigned long highstart_pfn
, highend_pfn
;
68 #define kmap_get_fixmap_pte(vaddr) \
69 pte_offset_kernel(pmd_offset(pgd_offset_k(vaddr), (vaddr)), (vaddr))
71 void __init
kmap_init(void)
73 /* cache the first kmap pte */
74 kmap_pte
= kmap_get_fixmap_pte(__fix_to_virt(FIX_KMAP_BEGIN
));
75 kmap_prot
= __pgprot(SRMMU_ET_PTE
| SRMMU_PRIV
| SRMMU_CACHE
);
80 printk("Mem-info:\n");
82 printk("Free swap: %6ldkB\n",
83 nr_swap_pages
<< (PAGE_SHIFT
-10));
84 printk("%ld pages of RAM\n", totalram_pages
);
85 printk("%ld free pages\n", nr_free_pages());
88 void __init
sparc_context_init(int numctx
)
92 ctx_list_pool
= __alloc_bootmem(numctx
* sizeof(struct ctx_list
), SMP_CACHE_BYTES
, 0UL);
94 for(ctx
= 0; ctx
< numctx
; ctx
++) {
95 struct ctx_list
*clist
;
97 clist
= (ctx_list_pool
+ ctx
);
98 clist
->ctx_number
= ctx
;
101 ctx_free
.next
= ctx_free
.prev
= &ctx_free
;
102 ctx_used
.next
= ctx_used
.prev
= &ctx_used
;
103 for(ctx
= 0; ctx
< numctx
; ctx
++)
104 add_to_free_ctxlist(ctx_list_pool
+ ctx
);
107 extern unsigned long cmdline_memory_size
;
108 unsigned long last_valid_pfn
;
110 unsigned long calc_highpages(void)
115 for (i
= 0; sp_banks
[i
].num_bytes
!= 0; i
++) {
116 unsigned long start_pfn
= sp_banks
[i
].base_addr
>> PAGE_SHIFT
;
117 unsigned long end_pfn
= (sp_banks
[i
].base_addr
+ sp_banks
[i
].num_bytes
) >> PAGE_SHIFT
;
119 if (end_pfn
<= max_low_pfn
)
122 if (start_pfn
< max_low_pfn
)
123 start_pfn
= max_low_pfn
;
125 nr
+= end_pfn
- start_pfn
;
131 static unsigned long calc_max_low_pfn(void)
134 unsigned long tmp
= pfn_base
+ (SRMMU_MAXMEM
>> PAGE_SHIFT
);
135 unsigned long curr_pfn
, last_pfn
;
137 last_pfn
= (sp_banks
[0].base_addr
+ sp_banks
[0].num_bytes
) >> PAGE_SHIFT
;
138 for (i
= 1; sp_banks
[i
].num_bytes
!= 0; i
++) {
139 curr_pfn
= sp_banks
[i
].base_addr
>> PAGE_SHIFT
;
141 if (curr_pfn
>= tmp
) {
147 last_pfn
= (sp_banks
[i
].base_addr
+ sp_banks
[i
].num_bytes
) >> PAGE_SHIFT
;
153 unsigned long __init
bootmem_init(unsigned long *pages_avail
)
155 unsigned long bootmap_size
, start_pfn
;
156 unsigned long end_of_phys_memory
= 0UL;
157 unsigned long bootmap_pfn
, bytes_avail
, size
;
161 for (i
= 0; sp_banks
[i
].num_bytes
!= 0; i
++) {
162 end_of_phys_memory
= sp_banks
[i
].base_addr
+
163 sp_banks
[i
].num_bytes
;
164 bytes_avail
+= sp_banks
[i
].num_bytes
;
165 if (cmdline_memory_size
) {
166 if (bytes_avail
> cmdline_memory_size
) {
167 unsigned long slack
= bytes_avail
- cmdline_memory_size
;
169 bytes_avail
-= slack
;
170 end_of_phys_memory
-= slack
;
172 sp_banks
[i
].num_bytes
-= slack
;
173 if (sp_banks
[i
].num_bytes
== 0) {
174 sp_banks
[i
].base_addr
= 0xdeadbeef;
176 sp_banks
[i
+1].num_bytes
= 0;
177 sp_banks
[i
+1].base_addr
= 0xdeadbeef;
184 /* Start with page aligned address of last symbol in kernel
187 start_pfn
= (unsigned long)__pa(PAGE_ALIGN((unsigned long) &_end
));
189 /* Now shift down to get the real physical page frame number. */
190 start_pfn
>>= PAGE_SHIFT
;
192 bootmap_pfn
= start_pfn
;
194 max_pfn
= end_of_phys_memory
>> PAGE_SHIFT
;
196 max_low_pfn
= max_pfn
;
197 highstart_pfn
= highend_pfn
= max_pfn
;
199 if (max_low_pfn
> pfn_base
+ (SRMMU_MAXMEM
>> PAGE_SHIFT
)) {
200 highstart_pfn
= pfn_base
+ (SRMMU_MAXMEM
>> PAGE_SHIFT
);
201 max_low_pfn
= calc_max_low_pfn();
202 printk(KERN_NOTICE
"%ldMB HIGHMEM available.\n",
203 calc_highpages() >> (20 - PAGE_SHIFT
));
206 #ifdef CONFIG_BLK_DEV_INITRD
207 /* Now have to check initial ramdisk, so that bootmap does not overwrite it */
208 if (sparc_ramdisk_image
) {
209 if (sparc_ramdisk_image
>= (unsigned long)&_end
- 2 * PAGE_SIZE
)
210 sparc_ramdisk_image
-= KERNBASE
;
211 initrd_start
= sparc_ramdisk_image
+ phys_base
;
212 initrd_end
= initrd_start
+ sparc_ramdisk_size
;
213 if (initrd_end
> end_of_phys_memory
) {
214 printk(KERN_CRIT
"initrd extends beyond end of memory "
215 "(0x%016lx > 0x%016lx)\ndisabling initrd\n",
216 initrd_end
, end_of_phys_memory
);
220 if (initrd_start
>= (start_pfn
<< PAGE_SHIFT
) &&
221 initrd_start
< (start_pfn
<< PAGE_SHIFT
) + 2 * PAGE_SIZE
)
222 bootmap_pfn
= PAGE_ALIGN (initrd_end
) >> PAGE_SHIFT
;
226 /* Initialize the boot-time allocator. */
227 bootmap_size
= init_bootmem_node(NODE_DATA(0), bootmap_pfn
, pfn_base
,
230 /* Now register the available physical memory with the
234 for (i
= 0; sp_banks
[i
].num_bytes
!= 0; i
++) {
235 unsigned long curr_pfn
, last_pfn
;
237 curr_pfn
= sp_banks
[i
].base_addr
>> PAGE_SHIFT
;
238 if (curr_pfn
>= max_low_pfn
)
241 last_pfn
= (sp_banks
[i
].base_addr
+ sp_banks
[i
].num_bytes
) >> PAGE_SHIFT
;
242 if (last_pfn
> max_low_pfn
)
243 last_pfn
= max_low_pfn
;
246 * .. finally, did all the rounding and playing
247 * around just make the area go away?
249 if (last_pfn
<= curr_pfn
)
252 size
= (last_pfn
- curr_pfn
) << PAGE_SHIFT
;
253 *pages_avail
+= last_pfn
- curr_pfn
;
255 free_bootmem(sp_banks
[i
].base_addr
, size
);
258 #ifdef CONFIG_BLK_DEV_INITRD
260 /* Reserve the initrd image area. */
261 size
= initrd_end
- initrd_start
;
262 reserve_bootmem(initrd_start
, size
, BOOTMEM_DEFAULT
);
263 *pages_avail
-= PAGE_ALIGN(size
) >> PAGE_SHIFT
;
265 initrd_start
= (initrd_start
- phys_base
) + PAGE_OFFSET
;
266 initrd_end
= (initrd_end
- phys_base
) + PAGE_OFFSET
;
269 /* Reserve the kernel text/data/bss. */
270 size
= (start_pfn
<< PAGE_SHIFT
) - phys_base
;
271 reserve_bootmem(phys_base
, size
, BOOTMEM_DEFAULT
);
272 *pages_avail
-= PAGE_ALIGN(size
) >> PAGE_SHIFT
;
274 /* Reserve the bootmem map. We do not account for it
275 * in pages_avail because we will release that memory
276 * in free_all_bootmem.
279 reserve_bootmem((bootmap_pfn
<< PAGE_SHIFT
), size
, BOOTMEM_DEFAULT
);
280 *pages_avail
-= PAGE_ALIGN(size
) >> PAGE_SHIFT
;
288 * This is called at the end of unmapping of VMA (zap_page_range),
289 * to rescan the page cache for architecture specific things,
290 * presumably something like sun4/sun4c PMEGs. Most architectures
291 * define check_pgt_cache empty.
293 * We simply copy the 2.4 implementation for now.
295 static int pgt_cache_water
[2] = { 25, 50 };
297 void check_pgt_cache(void)
299 do_check_pgt_cache(pgt_cache_water
[0], pgt_cache_water
[1]);
303 * paging_init() sets up the page tables: We call the MMU specific
304 * init routine based upon the Sun model type on the Sparc.
307 extern void sun4c_paging_init(void);
308 extern void srmmu_paging_init(void);
309 extern void device_scan(void);
311 pgprot_t PAGE_SHARED __read_mostly
;
312 EXPORT_SYMBOL(PAGE_SHARED
);
314 void __init
paging_init(void)
316 switch(sparc_cpu_model
) {
321 sparc_unmapped_base
= 0xe0000000;
322 BTFIXUPSET_SETHI(sparc_unmapped_base
, 0xe0000000);
330 sparc_unmapped_base
= 0x50000000;
331 BTFIXUPSET_SETHI(sparc_unmapped_base
, 0x50000000);
334 prom_printf("paging_init: Cannot init paging on this Sparc\n");
335 prom_printf("paging_init: sparc_cpu_model = %d\n", sparc_cpu_model
);
336 prom_printf("paging_init: Halting...\n");
340 /* Initialize the protection map with non-constant, MMU dependent values. */
341 protection_map
[0] = PAGE_NONE
;
342 protection_map
[1] = PAGE_READONLY
;
343 protection_map
[2] = PAGE_COPY
;
344 protection_map
[3] = PAGE_COPY
;
345 protection_map
[4] = PAGE_READONLY
;
346 protection_map
[5] = PAGE_READONLY
;
347 protection_map
[6] = PAGE_COPY
;
348 protection_map
[7] = PAGE_COPY
;
349 protection_map
[8] = PAGE_NONE
;
350 protection_map
[9] = PAGE_READONLY
;
351 protection_map
[10] = PAGE_SHARED
;
352 protection_map
[11] = PAGE_SHARED
;
353 protection_map
[12] = PAGE_READONLY
;
354 protection_map
[13] = PAGE_READONLY
;
355 protection_map
[14] = PAGE_SHARED
;
356 protection_map
[15] = PAGE_SHARED
;
358 prom_build_devicetree();
359 of_fill_in_cpu_data();
363 static void __init
taint_real_pages(void)
367 for (i
= 0; sp_banks
[i
].num_bytes
; i
++) {
368 unsigned long start
, end
;
370 start
= sp_banks
[i
].base_addr
;
371 end
= start
+ sp_banks
[i
].num_bytes
;
373 while (start
< end
) {
374 set_bit(start
>> 20, sparc_valid_addr_bitmap
);
380 static void map_high_region(unsigned long start_pfn
, unsigned long end_pfn
)
384 #ifdef CONFIG_DEBUG_HIGHMEM
385 printk("mapping high region %08lx - %08lx\n", start_pfn
, end_pfn
);
388 for (tmp
= start_pfn
; tmp
< end_pfn
; tmp
++) {
389 struct page
*page
= pfn_to_page(tmp
);
391 ClearPageReserved(page
);
392 init_page_count(page
);
398 void __init
mem_init(void)
403 int reservedpages
= 0;
406 if (PKMAP_BASE
+LAST_PKMAP
*PAGE_SIZE
>= FIXADDR_START
) {
407 prom_printf("BUG: fixmap and pkmap areas overlap\n");
408 prom_printf("pkbase: 0x%lx pkend: 0x%lx fixstart 0x%lx\n",
410 (unsigned long)PKMAP_BASE
+LAST_PKMAP
*PAGE_SIZE
,
412 prom_printf("Please mail sparclinux@vger.kernel.org.\n");
417 /* Saves us work later. */
418 memset((void *)&empty_zero_page
, 0, PAGE_SIZE
);
420 i
= last_valid_pfn
>> ((20 - PAGE_SHIFT
) + 5);
422 sparc_valid_addr_bitmap
= (unsigned long *)
423 __alloc_bootmem(i
<< 2, SMP_CACHE_BYTES
, 0UL);
425 if (sparc_valid_addr_bitmap
== NULL
) {
426 prom_printf("mem_init: Cannot alloc valid_addr_bitmap.\n");
429 memset(sparc_valid_addr_bitmap
, 0, i
<< 2);
433 max_mapnr
= last_valid_pfn
- pfn_base
;
434 high_memory
= __va(max_low_pfn
<< PAGE_SHIFT
);
436 totalram_pages
= free_all_bootmem();
438 for (i
= 0; sp_banks
[i
].num_bytes
!= 0; i
++) {
439 unsigned long start_pfn
= sp_banks
[i
].base_addr
>> PAGE_SHIFT
;
440 unsigned long end_pfn
= (sp_banks
[i
].base_addr
+ sp_banks
[i
].num_bytes
) >> PAGE_SHIFT
;
442 num_physpages
+= sp_banks
[i
].num_bytes
>> PAGE_SHIFT
;
444 if (end_pfn
<= highstart_pfn
)
447 if (start_pfn
< highstart_pfn
)
448 start_pfn
= highstart_pfn
;
450 map_high_region(start_pfn
, end_pfn
);
453 totalram_pages
+= totalhigh_pages
;
455 codepages
= (((unsigned long) &_etext
) - ((unsigned long)&_start
));
456 codepages
= PAGE_ALIGN(codepages
) >> PAGE_SHIFT
;
457 datapages
= (((unsigned long) &_edata
) - ((unsigned long)&_etext
));
458 datapages
= PAGE_ALIGN(datapages
) >> PAGE_SHIFT
;
459 initpages
= (((unsigned long) &__init_end
) - ((unsigned long) &__init_begin
));
460 initpages
= PAGE_ALIGN(initpages
) >> PAGE_SHIFT
;
462 /* Ignore memory holes for the purpose of counting reserved pages */
463 for (i
=0; i
< max_low_pfn
; i
++)
464 if (test_bit(i
>> (20 - PAGE_SHIFT
), sparc_valid_addr_bitmap
)
465 && PageReserved(pfn_to_page(i
)))
468 printk(KERN_INFO
"Memory: %luk/%luk available (%dk kernel code, %dk reserved, %dk data, %dk init, %ldk highmem)\n",
469 nr_free_pages() << (PAGE_SHIFT
-10),
470 num_physpages
<< (PAGE_SHIFT
- 10),
471 codepages
<< (PAGE_SHIFT
-10),
472 reservedpages
<< (PAGE_SHIFT
- 10),
473 datapages
<< (PAGE_SHIFT
-10),
474 initpages
<< (PAGE_SHIFT
-10),
475 totalhigh_pages
<< (PAGE_SHIFT
-10));
478 void free_initmem (void)
483 addr
= (unsigned long)(&__init_begin
);
484 freed
= (unsigned long)(&__init_end
) - addr
;
485 for (; addr
< (unsigned long)(&__init_end
); addr
+= PAGE_SIZE
) {
488 memset((void *)addr
, POISON_FREE_INITMEM
, PAGE_SIZE
);
489 p
= virt_to_page(addr
);
491 ClearPageReserved(p
);
497 printk(KERN_INFO
"Freeing unused kernel memory: %ldk freed\n",
501 #ifdef CONFIG_BLK_DEV_INITRD
502 void free_initrd_mem(unsigned long start
, unsigned long end
)
505 printk(KERN_INFO
"Freeing initrd memory: %ldk freed\n",
506 (end
- start
) >> 10);
507 for (; start
< end
; start
+= PAGE_SIZE
) {
510 memset((void *)start
, POISON_FREE_INITMEM
, PAGE_SIZE
);
511 p
= virt_to_page(start
);
513 ClearPageReserved(p
);
522 void sparc_flush_page_to_ram(struct page
*page
)
524 unsigned long vaddr
= (unsigned long)page_address(page
);
527 __flush_page_to_ram(vaddr
);
529 EXPORT_SYMBOL(sparc_flush_page_to_ram
);