3 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
5 * Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au)
6 * and Cort Dougan (PReP) (cort@cs.nmt.edu)
7 * Copyright (C) 1996 Paul Mackerras
8 * Amiga/APUS changes by Jesper Skov (jskov@cygnus.co.uk).
9 * PPC44x/36-bit changes by Matt Porter (mporter@mvista.com)
11 * Derived from "arch/i386/mm/init.c"
12 * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
14 * This program is free software; you can redistribute it and/or
15 * modify it under the terms of the GNU General Public License
16 * as published by the Free Software Foundation; either version
17 * 2 of the License, or (at your option) any later version.
21 #include <linux/config.h>
22 #include <linux/module.h>
23 #include <linux/sched.h>
24 #include <linux/kernel.h>
25 #include <linux/errno.h>
26 #include <linux/string.h>
27 #include <linux/types.h>
29 #include <linux/stddef.h>
30 #include <linux/init.h>
31 #include <linux/bootmem.h>
32 #include <linux/highmem.h>
33 #include <linux/initrd.h>
34 #include <linux/pagemap.h>
36 #include <asm/pgalloc.h>
39 #include <asm/mmu_context.h>
40 #include <asm/pgtable.h>
43 #include <asm/machdep.h>
44 #include <asm/btext.h>
48 #include <asm/sections.h>
53 #ifndef CPU_FTR_COHERENT_ICACHE
54 #define CPU_FTR_COHERENT_ICACHE 0 /* XXX for now */
55 #define CPU_FTR_NOEXECUTE 0
58 int init_bootmem_done
;
60 unsigned long memory_limit
;
62 extern void hash_preload(struct mm_struct
*mm
, unsigned long ea
,
63 unsigned long access
, unsigned long trap
);
66 * This is called by /dev/mem to know if a given address has to
67 * be mapped non-cacheable or not
69 int page_is_ram(unsigned long pfn
)
71 unsigned long paddr
= (pfn
<< PAGE_SHIFT
);
73 #ifndef CONFIG_PPC64 /* XXX for now */
74 return paddr
< __pa(high_memory
);
77 for (i
=0; i
< lmb
.memory
.cnt
; i
++) {
80 base
= lmb
.memory
.region
[i
].base
;
82 if ((paddr
>= base
) &&
83 (paddr
< (base
+ lmb
.memory
.region
[i
].size
))) {
91 EXPORT_SYMBOL(page_is_ram
);
93 pgprot_t
phys_mem_access_prot(struct file
*file
, unsigned long pfn
,
94 unsigned long size
, pgprot_t vma_prot
)
96 if (ppc_md
.phys_mem_access_prot
)
97 return ppc_md
.phys_mem_access_prot(file
, pfn
, size
, vma_prot
);
99 if (!page_is_ram(pfn
))
100 vma_prot
= __pgprot(pgprot_val(vma_prot
)
101 | _PAGE_GUARDED
| _PAGE_NO_CACHE
);
104 EXPORT_SYMBOL(phys_mem_access_prot
);
106 #ifdef CONFIG_MEMORY_HOTPLUG
108 void online_page(struct page
*page
)
110 ClearPageReserved(page
);
111 set_page_count(page
, 0);
112 free_cold_page(page
);
118 * This works only for the non-NUMA case. Later, we'll need a lookup
119 * to convert from real physical addresses to nid, that doesn't use
122 int __devinit
add_memory(u64 start
, u64 size
)
124 struct pglist_data
*pgdata
= NODE_DATA(0);
126 unsigned long start_pfn
= start
>> PAGE_SHIFT
;
127 unsigned long nr_pages
= size
>> PAGE_SHIFT
;
130 create_section_mapping(start
, start
+ size
);
132 /* this should work for most non-highmem platforms */
133 zone
= pgdata
->node_zones
;
135 return __add_pages(zone
, start_pfn
, nr_pages
);
141 * First pass at this code will check to determine if the remove
142 * request is within the RMO. Do not allow removal within the RMO.
144 int __devinit
remove_memory(u64 start
, u64 size
)
147 unsigned long start_pfn
, end_pfn
, nr_pages
;
149 start_pfn
= start
>> PAGE_SHIFT
;
150 nr_pages
= size
>> PAGE_SHIFT
;
151 end_pfn
= start_pfn
+ nr_pages
;
153 printk("%s(): Attempting to remove memoy in range "
154 "%lx to %lx\n", __func__
, start
, start
+size
);
156 * check for range within RMO
158 zone
= page_zone(pfn_to_page(start_pfn
));
160 printk("%s(): memory will be removed from "
161 "the %s zone\n", __func__
, zone
->name
);
164 * not handling removing memory ranges that
165 * overlap multiple zones yet
167 if (end_pfn
> (zone
->zone_start_pfn
+ zone
->spanned_pages
))
170 /* make sure it is NOT in RMO */
171 if ((start
< lmb
.rmo_size
) || ((start
+size
) < lmb
.rmo_size
)) {
172 printk("%s(): range to be removed must NOT be in RMO!\n",
177 return __remove_pages(zone
, start_pfn
, nr_pages
);
180 printk("%s(): memory range to be removed overlaps "
181 "multiple zones!!!\n", __func__
);
185 #endif /* CONFIG_MEMORY_HOTPLUG */
189 unsigned long total
= 0, reserved
= 0;
190 unsigned long shared
= 0, cached
= 0;
191 unsigned long highmem
= 0;
196 printk("Mem-info:\n");
198 printk("Free swap: %6ldkB\n", nr_swap_pages
<<(PAGE_SHIFT
-10));
199 for_each_pgdat(pgdat
) {
201 pgdat_resize_lock(pgdat
, &flags
);
202 for (i
= 0; i
< pgdat
->node_spanned_pages
; i
++) {
203 if (!pfn_valid(pgdat
->node_start_pfn
+ i
))
205 page
= pgdat_page_nr(pgdat
, i
);
207 if (PageHighMem(page
))
209 if (PageReserved(page
))
211 else if (PageSwapCache(page
))
213 else if (page_count(page
))
214 shared
+= page_count(page
) - 1;
216 pgdat_resize_unlock(pgdat
, &flags
);
218 printk("%ld pages of RAM\n", total
);
219 #ifdef CONFIG_HIGHMEM
220 printk("%ld pages of HIGHMEM\n", highmem
);
222 printk("%ld reserved pages\n", reserved
);
223 printk("%ld pages shared\n", shared
);
224 printk("%ld pages swap cached\n", cached
);
228 * Initialize the bootmem system and give it all the memory we
229 * have available. If we are using highmem, we only put the
230 * lowmem into the bootmem system.
232 #ifndef CONFIG_NEED_MULTIPLE_NODES
233 void __init
do_init_bootmem(void)
236 unsigned long start
, bootmap_pages
;
237 unsigned long total_pages
;
240 max_pfn
= total_pages
= lmb_end_of_DRAM() >> PAGE_SHIFT
;
241 #ifdef CONFIG_HIGHMEM
242 total_pages
= total_lowmem
>> PAGE_SHIFT
;
246 * Find an area to use for the bootmem bitmap. Calculate the size of
247 * bitmap required as (Total Memory) / PAGE_SIZE / BITS_PER_BYTE.
248 * Add 1 additional page in case the address isn't page-aligned.
250 bootmap_pages
= bootmem_bootmap_pages(total_pages
);
252 start
= lmb_alloc(bootmap_pages
<< PAGE_SHIFT
, PAGE_SIZE
);
255 boot_mapsize
= init_bootmem(start
>> PAGE_SHIFT
, total_pages
);
257 /* Add all physical memory to the bootmem map, mark each area
260 for (i
= 0; i
< lmb
.memory
.cnt
; i
++) {
261 unsigned long base
= lmb
.memory
.region
[i
].base
;
262 unsigned long size
= lmb_size_bytes(&lmb
.memory
, i
);
263 #ifdef CONFIG_HIGHMEM
264 if (base
>= total_lowmem
)
266 if (base
+ size
> total_lowmem
)
267 size
= total_lowmem
- base
;
269 free_bootmem(base
, size
);
272 /* reserve the sections we're already using */
273 for (i
= 0; i
< lmb
.reserved
.cnt
; i
++)
274 reserve_bootmem(lmb
.reserved
.region
[i
].base
,
275 lmb_size_bytes(&lmb
.reserved
, i
));
277 /* XXX need to clip this if using highmem? */
278 for (i
= 0; i
< lmb
.memory
.cnt
; i
++)
279 memory_present(0, lmb_start_pfn(&lmb
.memory
, i
),
280 lmb_end_pfn(&lmb
.memory
, i
));
281 init_bootmem_done
= 1;
285 * paging_init() sets up the page tables - in fact we've already done this.
287 void __init
paging_init(void)
289 unsigned long zones_size
[MAX_NR_ZONES
];
290 unsigned long zholes_size
[MAX_NR_ZONES
];
291 unsigned long total_ram
= lmb_phys_mem_size();
292 unsigned long top_of_ram
= lmb_end_of_DRAM();
294 #ifdef CONFIG_HIGHMEM
295 map_page(PKMAP_BASE
, 0, 0); /* XXX gross */
296 pkmap_page_table
= pte_offset_kernel(pmd_offset(pgd_offset_k
297 (PKMAP_BASE
), PKMAP_BASE
), PKMAP_BASE
);
298 map_page(KMAP_FIX_BEGIN
, 0, 0); /* XXX gross */
299 kmap_pte
= pte_offset_kernel(pmd_offset(pgd_offset_k
300 (KMAP_FIX_BEGIN
), KMAP_FIX_BEGIN
), KMAP_FIX_BEGIN
);
301 kmap_prot
= PAGE_KERNEL
;
302 #endif /* CONFIG_HIGHMEM */
304 printk(KERN_INFO
"Top of RAM: 0x%lx, Total RAM: 0x%lx\n",
305 top_of_ram
, total_ram
);
306 printk(KERN_INFO
"Memory hole size: %ldMB\n",
307 (top_of_ram
- total_ram
) >> 20);
309 * All pages are DMA-able so we put them all in the DMA zone.
311 memset(zones_size
, 0, sizeof(zones_size
));
312 memset(zholes_size
, 0, sizeof(zholes_size
));
314 zones_size
[ZONE_DMA
] = top_of_ram
>> PAGE_SHIFT
;
315 zholes_size
[ZONE_DMA
] = (top_of_ram
- total_ram
) >> PAGE_SHIFT
;
317 #ifdef CONFIG_HIGHMEM
318 zones_size
[ZONE_DMA
] = total_lowmem
>> PAGE_SHIFT
;
319 zones_size
[ZONE_HIGHMEM
] = (total_memory
- total_lowmem
) >> PAGE_SHIFT
;
320 zholes_size
[ZONE_HIGHMEM
] = (top_of_ram
- total_ram
) >> PAGE_SHIFT
;
322 zones_size
[ZONE_DMA
] = top_of_ram
>> PAGE_SHIFT
;
323 zholes_size
[ZONE_DMA
] = (top_of_ram
- total_ram
) >> PAGE_SHIFT
;
324 #endif /* CONFIG_HIGHMEM */
326 free_area_init_node(0, NODE_DATA(0), zones_size
,
327 __pa(PAGE_OFFSET
) >> PAGE_SHIFT
, zholes_size
);
329 #endif /* ! CONFIG_NEED_MULTIPLE_NODES */
331 void __init
mem_init(void)
333 #ifdef CONFIG_NEED_MULTIPLE_NODES
339 unsigned long reservedpages
= 0, codesize
, initsize
, datasize
, bsssize
;
341 num_physpages
= lmb
.memory
.size
>> PAGE_SHIFT
;
342 high_memory
= (void *) __va(max_low_pfn
* PAGE_SIZE
);
344 #ifdef CONFIG_NEED_MULTIPLE_NODES
345 for_each_online_node(nid
) {
346 if (NODE_DATA(nid
)->node_spanned_pages
!= 0) {
347 printk("freeing bootmem node %x\n", nid
);
349 free_all_bootmem_node(NODE_DATA(nid
));
354 totalram_pages
+= free_all_bootmem();
356 for_each_pgdat(pgdat
) {
357 for (i
= 0; i
< pgdat
->node_spanned_pages
; i
++) {
358 if (!pfn_valid(pgdat
->node_start_pfn
+ i
))
360 page
= pgdat_page_nr(pgdat
, i
);
361 if (PageReserved(page
))
366 codesize
= (unsigned long)&_sdata
- (unsigned long)&_stext
;
367 datasize
= (unsigned long)&_edata
- (unsigned long)&_sdata
;
368 initsize
= (unsigned long)&__init_end
- (unsigned long)&__init_begin
;
369 bsssize
= (unsigned long)&__bss_stop
- (unsigned long)&__bss_start
;
371 #ifdef CONFIG_HIGHMEM
373 unsigned long pfn
, highmem_mapnr
;
375 highmem_mapnr
= total_lowmem
>> PAGE_SHIFT
;
376 for (pfn
= highmem_mapnr
; pfn
< max_mapnr
; ++pfn
) {
377 struct page
*page
= pfn_to_page(pfn
);
379 ClearPageReserved(page
);
380 set_page_count(page
, 1);
384 totalram_pages
+= totalhigh_pages
;
385 printk(KERN_INFO
"High memory: %luk\n",
386 totalhigh_pages
<< (PAGE_SHIFT
-10));
388 #endif /* CONFIG_HIGHMEM */
390 printk(KERN_INFO
"Memory: %luk/%luk available (%luk kernel code, "
391 "%luk reserved, %luk data, %luk bss, %luk init)\n",
392 (unsigned long)nr_free_pages() << (PAGE_SHIFT
-10),
393 num_physpages
<< (PAGE_SHIFT
-10),
395 reservedpages
<< (PAGE_SHIFT
-10),
402 /* Initialize the vDSO */
407 * This is called when a page has been modified by the kernel.
408 * It just marks the page as not i-cache clean. We do the i-cache
409 * flush later when the page is given to a user process, if necessary.
411 void flush_dcache_page(struct page
*page
)
413 if (cpu_has_feature(CPU_FTR_COHERENT_ICACHE
))
415 /* avoid an atomic op if possible */
416 if (test_bit(PG_arch_1
, &page
->flags
))
417 clear_bit(PG_arch_1
, &page
->flags
);
419 EXPORT_SYMBOL(flush_dcache_page
);
421 void flush_dcache_icache_page(struct page
*page
)
424 void *start
= kmap_atomic(page
, KM_PPC_SYNC_ICACHE
);
425 __flush_dcache_icache(start
);
426 kunmap_atomic(start
, KM_PPC_SYNC_ICACHE
);
427 #elif defined(CONFIG_8xx) || defined(CONFIG_PPC64)
428 /* On 8xx there is no need to kmap since highmem is not supported */
429 __flush_dcache_icache(page_address(page
));
431 __flush_dcache_icache_phys(page_to_pfn(page
) << PAGE_SHIFT
);
435 void clear_user_page(void *page
, unsigned long vaddr
, struct page
*pg
)
439 if (cpu_has_feature(CPU_FTR_COHERENT_ICACHE
))
442 * We shouldnt have to do this, but some versions of glibc
443 * require it (ld.so assumes zero filled pages are icache clean)
447 /* avoid an atomic op if possible */
448 if (test_bit(PG_arch_1
, &pg
->flags
))
449 clear_bit(PG_arch_1
, &pg
->flags
);
451 EXPORT_SYMBOL(clear_user_page
);
453 void copy_user_page(void *vto
, void *vfrom
, unsigned long vaddr
,
456 copy_page(vto
, vfrom
);
459 * We should be able to use the following optimisation, however
460 * there are two problems.
461 * Firstly a bug in some versions of binutils meant PLT sections
462 * were not marked executable.
463 * Secondly the first word in the GOT section is blrl, used
464 * to establish the GOT address. Until recently the GOT was
465 * not marked executable.
469 if (!vma
->vm_file
&& ((vma
->vm_flags
& VM_EXEC
) == 0))
473 if (cpu_has_feature(CPU_FTR_COHERENT_ICACHE
))
476 /* avoid an atomic op if possible */
477 if (test_bit(PG_arch_1
, &pg
->flags
))
478 clear_bit(PG_arch_1
, &pg
->flags
);
481 void flush_icache_user_range(struct vm_area_struct
*vma
, struct page
*page
,
482 unsigned long addr
, int len
)
486 maddr
= (unsigned long) kmap(page
) + (addr
& ~PAGE_MASK
);
487 flush_icache_range(maddr
, maddr
+ len
);
490 EXPORT_SYMBOL(flush_icache_user_range
);
493 * This is called at the end of handling a user page fault, when the
494 * fault has been handled by updating a PTE in the linux page tables.
495 * We use it to preload an HPTE into the hash table corresponding to
496 * the updated linux PTE.
498 * This must always be called with the pte lock held.
500 void update_mmu_cache(struct vm_area_struct
*vma
, unsigned long address
,
503 #ifdef CONFIG_PPC_STD_MMU
504 unsigned long access
= 0, trap
;
506 unsigned long pfn
= pte_pfn(pte
);
508 /* handle i-cache coherency */
509 if (!cpu_has_feature(CPU_FTR_COHERENT_ICACHE
) &&
510 !cpu_has_feature(CPU_FTR_NOEXECUTE
) &&
512 struct page
*page
= pfn_to_page(pfn
);
513 if (!PageReserved(page
)
514 && !test_bit(PG_arch_1
, &page
->flags
)) {
515 if (vma
->vm_mm
== current
->active_mm
) {
517 /* On 8xx, cache control instructions (particularly
518 * "dcbst" from flush_dcache_icache) fault as write
519 * operation if there is an unpopulated TLB entry
520 * for the address in question. To workaround that,
521 * we invalidate the TLB here, thus avoiding dcbst
526 __flush_dcache_icache((void *) address
);
528 flush_dcache_icache_page(page
);
529 set_bit(PG_arch_1
, &page
->flags
);
533 #ifdef CONFIG_PPC_STD_MMU
534 /* We only want HPTEs for linux PTEs that have _PAGE_ACCESSED set */
535 if (!pte_young(pte
) || address
>= TASK_SIZE
)
538 /* We try to figure out if we are coming from an instruction
539 * access fault and pass that down to __hash_page so we avoid
540 * double-faulting on execution of fresh text. We have to test
541 * for regs NULL since init will get here first thing at boot
543 * We also avoid filling the hash if not coming from a fault
545 if (current
->thread
.regs
== NULL
)
547 trap
= TRAP(current
->thread
.regs
);
549 access
|= _PAGE_EXEC
;
550 else if (trap
!= 0x300)
552 hash_preload(vma
->vm_mm
, address
, access
, trap
);
553 #endif /* CONFIG_PPC_STD_MMU */