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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Initialize MMU support. | |
3 | * | |
4 | * Copyright (C) 1998-2003 Hewlett-Packard Co | |
5 | * David Mosberger-Tang <davidm@hpl.hp.com> | |
6 | */ | |
1da177e4 LT |
7 | #include <linux/kernel.h> |
8 | #include <linux/init.h> | |
9 | ||
10 | #include <linux/bootmem.h> | |
11 | #include <linux/efi.h> | |
12 | #include <linux/elf.h> | |
13 | #include <linux/mm.h> | |
14 | #include <linux/mmzone.h> | |
15 | #include <linux/module.h> | |
16 | #include <linux/personality.h> | |
17 | #include <linux/reboot.h> | |
18 | #include <linux/slab.h> | |
19 | #include <linux/swap.h> | |
20 | #include <linux/proc_fs.h> | |
21 | #include <linux/bitops.h> | |
139b8304 | 22 | #include <linux/kexec.h> |
1da177e4 LT |
23 | |
24 | #include <asm/a.out.h> | |
25 | #include <asm/dma.h> | |
26 | #include <asm/ia32.h> | |
27 | #include <asm/io.h> | |
28 | #include <asm/machvec.h> | |
29 | #include <asm/numa.h> | |
30 | #include <asm/patch.h> | |
31 | #include <asm/pgalloc.h> | |
32 | #include <asm/sal.h> | |
33 | #include <asm/sections.h> | |
34 | #include <asm/system.h> | |
35 | #include <asm/tlb.h> | |
36 | #include <asm/uaccess.h> | |
37 | #include <asm/unistd.h> | |
38 | #include <asm/mca.h> | |
39 | ||
40 | DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); | |
41 | ||
42 | extern void ia64_tlb_init (void); | |
43 | ||
44 | unsigned long MAX_DMA_ADDRESS = PAGE_OFFSET + 0x100000000UL; | |
45 | ||
46 | #ifdef CONFIG_VIRTUAL_MEM_MAP | |
47 | unsigned long vmalloc_end = VMALLOC_END_INIT; | |
48 | EXPORT_SYMBOL(vmalloc_end); | |
49 | struct page *vmem_map; | |
50 | EXPORT_SYMBOL(vmem_map); | |
51 | #endif | |
52 | ||
fde740e4 | 53 | struct page *zero_page_memmap_ptr; /* map entry for zero page */ |
1da177e4 LT |
54 | EXPORT_SYMBOL(zero_page_memmap_ptr); |
55 | ||
1da177e4 | 56 | void |
954ffcb3 | 57 | __ia64_sync_icache_dcache (pte_t pte) |
1da177e4 LT |
58 | { |
59 | unsigned long addr; | |
60 | struct page *page; | |
5e48521e | 61 | unsigned long order; |
1da177e4 | 62 | |
1da177e4 LT |
63 | page = pte_page(pte); |
64 | addr = (unsigned long) page_address(page); | |
65 | ||
66 | if (test_bit(PG_arch_1, &page->flags)) | |
67 | return; /* i-cache is already coherent with d-cache */ | |
68 | ||
5e48521e | 69 | if (PageCompound(page)) { |
d85f3385 | 70 | order = compound_order(page); |
5e48521e ZY |
71 | flush_icache_range(addr, addr + (1UL << order << PAGE_SHIFT)); |
72 | } | |
73 | else | |
74 | flush_icache_range(addr, addr + PAGE_SIZE); | |
1da177e4 LT |
75 | set_bit(PG_arch_1, &page->flags); /* mark page as clean */ |
76 | } | |
77 | ||
cde14bbf JB |
78 | /* |
79 | * Since DMA is i-cache coherent, any (complete) pages that were written via | |
80 | * DMA can be marked as "clean" so that lazy_mmu_prot_update() doesn't have to | |
81 | * flush them when they get mapped into an executable vm-area. | |
82 | */ | |
83 | void | |
84 | dma_mark_clean(void *addr, size_t size) | |
85 | { | |
86 | unsigned long pg_addr, end; | |
87 | ||
88 | pg_addr = PAGE_ALIGN((unsigned long) addr); | |
89 | end = (unsigned long) addr + size; | |
90 | while (pg_addr + PAGE_SIZE <= end) { | |
91 | struct page *page = virt_to_page(pg_addr); | |
92 | set_bit(PG_arch_1, &page->flags); | |
93 | pg_addr += PAGE_SIZE; | |
94 | } | |
95 | } | |
96 | ||
1da177e4 LT |
97 | inline void |
98 | ia64_set_rbs_bot (void) | |
99 | { | |
100 | unsigned long stack_size = current->signal->rlim[RLIMIT_STACK].rlim_max & -16; | |
101 | ||
102 | if (stack_size > MAX_USER_STACK_SIZE) | |
103 | stack_size = MAX_USER_STACK_SIZE; | |
83d2cd3d | 104 | current->thread.rbs_bot = PAGE_ALIGN(current->mm->start_stack - stack_size); |
1da177e4 LT |
105 | } |
106 | ||
107 | /* | |
108 | * This performs some platform-dependent address space initialization. | |
109 | * On IA-64, we want to setup the VM area for the register backing | |
110 | * store (which grows upwards) and install the gateway page which is | |
111 | * used for signal trampolines, etc. | |
112 | */ | |
113 | void | |
114 | ia64_init_addr_space (void) | |
115 | { | |
116 | struct vm_area_struct *vma; | |
117 | ||
118 | ia64_set_rbs_bot(); | |
119 | ||
120 | /* | |
121 | * If we're out of memory and kmem_cache_alloc() returns NULL, we simply ignore | |
122 | * the problem. When the process attempts to write to the register backing store | |
123 | * for the first time, it will get a SEGFAULT in this case. | |
124 | */ | |
c3762229 | 125 | vma = kmem_cache_zalloc(vm_area_cachep, GFP_KERNEL); |
1da177e4 | 126 | if (vma) { |
1da177e4 LT |
127 | vma->vm_mm = current->mm; |
128 | vma->vm_start = current->thread.rbs_bot & PAGE_MASK; | |
129 | vma->vm_end = vma->vm_start + PAGE_SIZE; | |
130 | vma->vm_page_prot = protection_map[VM_DATA_DEFAULT_FLAGS & 0x7]; | |
46dea3d0 | 131 | vma->vm_flags = VM_DATA_DEFAULT_FLAGS|VM_GROWSUP|VM_ACCOUNT; |
1da177e4 LT |
132 | down_write(¤t->mm->mmap_sem); |
133 | if (insert_vm_struct(current->mm, vma)) { | |
134 | up_write(¤t->mm->mmap_sem); | |
135 | kmem_cache_free(vm_area_cachep, vma); | |
136 | return; | |
137 | } | |
138 | up_write(¤t->mm->mmap_sem); | |
139 | } | |
140 | ||
141 | /* map NaT-page at address zero to speed up speculative dereferencing of NULL: */ | |
142 | if (!(current->personality & MMAP_PAGE_ZERO)) { | |
c3762229 | 143 | vma = kmem_cache_zalloc(vm_area_cachep, GFP_KERNEL); |
1da177e4 | 144 | if (vma) { |
1da177e4 LT |
145 | vma->vm_mm = current->mm; |
146 | vma->vm_end = PAGE_SIZE; | |
147 | vma->vm_page_prot = __pgprot(pgprot_val(PAGE_READONLY) | _PAGE_MA_NAT); | |
148 | vma->vm_flags = VM_READ | VM_MAYREAD | VM_IO | VM_RESERVED; | |
149 | down_write(¤t->mm->mmap_sem); | |
150 | if (insert_vm_struct(current->mm, vma)) { | |
151 | up_write(¤t->mm->mmap_sem); | |
152 | kmem_cache_free(vm_area_cachep, vma); | |
153 | return; | |
154 | } | |
155 | up_write(¤t->mm->mmap_sem); | |
156 | } | |
157 | } | |
158 | } | |
159 | ||
160 | void | |
161 | free_initmem (void) | |
162 | { | |
163 | unsigned long addr, eaddr; | |
164 | ||
165 | addr = (unsigned long) ia64_imva(__init_begin); | |
166 | eaddr = (unsigned long) ia64_imva(__init_end); | |
167 | while (addr < eaddr) { | |
168 | ClearPageReserved(virt_to_page(addr)); | |
7835e98b | 169 | init_page_count(virt_to_page(addr)); |
1da177e4 LT |
170 | free_page(addr); |
171 | ++totalram_pages; | |
172 | addr += PAGE_SIZE; | |
173 | } | |
174 | printk(KERN_INFO "Freeing unused kernel memory: %ldkB freed\n", | |
175 | (__init_end - __init_begin) >> 10); | |
176 | } | |
177 | ||
dae28066 | 178 | void __init |
1da177e4 LT |
179 | free_initrd_mem (unsigned long start, unsigned long end) |
180 | { | |
181 | struct page *page; | |
182 | /* | |
183 | * EFI uses 4KB pages while the kernel can use 4KB or bigger. | |
184 | * Thus EFI and the kernel may have different page sizes. It is | |
185 | * therefore possible to have the initrd share the same page as | |
186 | * the end of the kernel (given current setup). | |
187 | * | |
188 | * To avoid freeing/using the wrong page (kernel sized) we: | |
189 | * - align up the beginning of initrd | |
190 | * - align down the end of initrd | |
191 | * | |
192 | * | | | |
193 | * |=============| a000 | |
194 | * | | | |
195 | * | | | |
196 | * | | 9000 | |
197 | * |/////////////| | |
198 | * |/////////////| | |
199 | * |=============| 8000 | |
200 | * |///INITRD////| | |
201 | * |/////////////| | |
202 | * |/////////////| 7000 | |
203 | * | | | |
204 | * |KKKKKKKKKKKKK| | |
205 | * |=============| 6000 | |
206 | * |KKKKKKKKKKKKK| | |
207 | * |KKKKKKKKKKKKK| | |
208 | * K=kernel using 8KB pages | |
209 | * | |
210 | * In this example, we must free page 8000 ONLY. So we must align up | |
211 | * initrd_start and keep initrd_end as is. | |
212 | */ | |
213 | start = PAGE_ALIGN(start); | |
214 | end = end & PAGE_MASK; | |
215 | ||
216 | if (start < end) | |
217 | printk(KERN_INFO "Freeing initrd memory: %ldkB freed\n", (end - start) >> 10); | |
218 | ||
219 | for (; start < end; start += PAGE_SIZE) { | |
220 | if (!virt_addr_valid(start)) | |
221 | continue; | |
222 | page = virt_to_page(start); | |
223 | ClearPageReserved(page); | |
7835e98b | 224 | init_page_count(page); |
1da177e4 LT |
225 | free_page(start); |
226 | ++totalram_pages; | |
227 | } | |
228 | } | |
229 | ||
230 | /* | |
231 | * This installs a clean page in the kernel's page table. | |
232 | */ | |
dae28066 | 233 | static struct page * __init |
1da177e4 LT |
234 | put_kernel_page (struct page *page, unsigned long address, pgprot_t pgprot) |
235 | { | |
236 | pgd_t *pgd; | |
237 | pud_t *pud; | |
238 | pmd_t *pmd; | |
239 | pte_t *pte; | |
240 | ||
241 | if (!PageReserved(page)) | |
242 | printk(KERN_ERR "put_kernel_page: page at 0x%p not in reserved memory\n", | |
243 | page_address(page)); | |
244 | ||
245 | pgd = pgd_offset_k(address); /* note: this is NOT pgd_offset()! */ | |
246 | ||
1da177e4 LT |
247 | { |
248 | pud = pud_alloc(&init_mm, pgd, address); | |
249 | if (!pud) | |
250 | goto out; | |
1da177e4 LT |
251 | pmd = pmd_alloc(&init_mm, pud, address); |
252 | if (!pmd) | |
253 | goto out; | |
872fec16 | 254 | pte = pte_alloc_kernel(pmd, address); |
1da177e4 LT |
255 | if (!pte) |
256 | goto out; | |
872fec16 | 257 | if (!pte_none(*pte)) |
1da177e4 | 258 | goto out; |
1da177e4 | 259 | set_pte(pte, mk_pte(page, pgprot)); |
1da177e4 | 260 | } |
872fec16 | 261 | out: |
1da177e4 LT |
262 | /* no need for flush_tlb */ |
263 | return page; | |
264 | } | |
265 | ||
914a4ea4 | 266 | static void __init |
1da177e4 LT |
267 | setup_gate (void) |
268 | { | |
269 | struct page *page; | |
270 | ||
271 | /* | |
ad597bd5 DMT |
272 | * Map the gate page twice: once read-only to export the ELF |
273 | * headers etc. and once execute-only page to enable | |
274 | * privilege-promotion via "epc": | |
1da177e4 LT |
275 | */ |
276 | page = virt_to_page(ia64_imva(__start_gate_section)); | |
277 | put_kernel_page(page, GATE_ADDR, PAGE_READONLY); | |
278 | #ifdef HAVE_BUGGY_SEGREL | |
279 | page = virt_to_page(ia64_imva(__start_gate_section + PAGE_SIZE)); | |
280 | put_kernel_page(page, GATE_ADDR + PAGE_SIZE, PAGE_GATE); | |
281 | #else | |
282 | put_kernel_page(page, GATE_ADDR + PERCPU_PAGE_SIZE, PAGE_GATE); | |
ad597bd5 DMT |
283 | /* Fill in the holes (if any) with read-only zero pages: */ |
284 | { | |
285 | unsigned long addr; | |
286 | ||
287 | for (addr = GATE_ADDR + PAGE_SIZE; | |
288 | addr < GATE_ADDR + PERCPU_PAGE_SIZE; | |
289 | addr += PAGE_SIZE) | |
290 | { | |
291 | put_kernel_page(ZERO_PAGE(0), addr, | |
292 | PAGE_READONLY); | |
293 | put_kernel_page(ZERO_PAGE(0), addr + PERCPU_PAGE_SIZE, | |
294 | PAGE_READONLY); | |
295 | } | |
296 | } | |
1da177e4 LT |
297 | #endif |
298 | ia64_patch_gate(); | |
299 | } | |
300 | ||
301 | void __devinit | |
302 | ia64_mmu_init (void *my_cpu_data) | |
303 | { | |
00b65985 | 304 | unsigned long pta, impl_va_bits; |
1da177e4 LT |
305 | extern void __devinit tlb_init (void); |
306 | ||
307 | #ifdef CONFIG_DISABLE_VHPT | |
308 | # define VHPT_ENABLE_BIT 0 | |
309 | #else | |
310 | # define VHPT_ENABLE_BIT 1 | |
311 | #endif | |
312 | ||
1da177e4 LT |
313 | /* |
314 | * Check if the virtually mapped linear page table (VMLPT) overlaps with a mapped | |
315 | * address space. The IA-64 architecture guarantees that at least 50 bits of | |
316 | * virtual address space are implemented but if we pick a large enough page size | |
317 | * (e.g., 64KB), the mapped address space is big enough that it will overlap with | |
318 | * VMLPT. I assume that once we run on machines big enough to warrant 64KB pages, | |
319 | * IMPL_VA_MSB will be significantly bigger, so this is unlikely to become a | |
320 | * problem in practice. Alternatively, we could truncate the top of the mapped | |
321 | * address space to not permit mappings that would overlap with the VMLPT. | |
322 | * --davidm 00/12/06 | |
323 | */ | |
324 | # define pte_bits 3 | |
325 | # define mapped_space_bits (3*(PAGE_SHIFT - pte_bits) + PAGE_SHIFT) | |
326 | /* | |
327 | * The virtual page table has to cover the entire implemented address space within | |
328 | * a region even though not all of this space may be mappable. The reason for | |
329 | * this is that the Access bit and Dirty bit fault handlers perform | |
330 | * non-speculative accesses to the virtual page table, so the address range of the | |
331 | * virtual page table itself needs to be covered by virtual page table. | |
332 | */ | |
333 | # define vmlpt_bits (impl_va_bits - PAGE_SHIFT + pte_bits) | |
334 | # define POW2(n) (1ULL << (n)) | |
335 | ||
336 | impl_va_bits = ffz(~(local_cpu_data->unimpl_va_mask | (7UL << 61))); | |
337 | ||
338 | if (impl_va_bits < 51 || impl_va_bits > 61) | |
339 | panic("CPU has bogus IMPL_VA_MSB value of %lu!\n", impl_va_bits - 1); | |
6cf07a8c PC |
340 | /* |
341 | * mapped_space_bits - PAGE_SHIFT is the total number of ptes we need, | |
342 | * which must fit into "vmlpt_bits - pte_bits" slots. Second half of | |
343 | * the test makes sure that our mapped space doesn't overlap the | |
344 | * unimplemented hole in the middle of the region. | |
345 | */ | |
346 | if ((mapped_space_bits - PAGE_SHIFT > vmlpt_bits - pte_bits) || | |
347 | (mapped_space_bits > impl_va_bits - 1)) | |
348 | panic("Cannot build a big enough virtual-linear page table" | |
349 | " to cover mapped address space.\n" | |
350 | " Try using a smaller page size.\n"); | |
351 | ||
1da177e4 LT |
352 | |
353 | /* place the VMLPT at the end of each page-table mapped region: */ | |
354 | pta = POW2(61) - POW2(vmlpt_bits); | |
355 | ||
1da177e4 LT |
356 | /* |
357 | * Set the (virtually mapped linear) page table address. Bit | |
358 | * 8 selects between the short and long format, bits 2-7 the | |
359 | * size of the table, and bit 0 whether the VHPT walker is | |
360 | * enabled. | |
361 | */ | |
362 | ia64_set_pta(pta | (0 << 8) | (vmlpt_bits << 2) | VHPT_ENABLE_BIT); | |
363 | ||
364 | ia64_tlb_init(); | |
365 | ||
366 | #ifdef CONFIG_HUGETLB_PAGE | |
367 | ia64_set_rr(HPAGE_REGION_BASE, HPAGE_SHIFT << 2); | |
368 | ia64_srlz_d(); | |
369 | #endif | |
370 | } | |
371 | ||
372 | #ifdef CONFIG_VIRTUAL_MEM_MAP | |
e44e41d0 BP |
373 | int vmemmap_find_next_valid_pfn(int node, int i) |
374 | { | |
375 | unsigned long end_address, hole_next_pfn; | |
376 | unsigned long stop_address; | |
377 | pg_data_t *pgdat = NODE_DATA(node); | |
378 | ||
379 | end_address = (unsigned long) &vmem_map[pgdat->node_start_pfn + i]; | |
380 | end_address = PAGE_ALIGN(end_address); | |
381 | ||
382 | stop_address = (unsigned long) &vmem_map[ | |
383 | pgdat->node_start_pfn + pgdat->node_spanned_pages]; | |
384 | ||
385 | do { | |
386 | pgd_t *pgd; | |
387 | pud_t *pud; | |
388 | pmd_t *pmd; | |
389 | pte_t *pte; | |
390 | ||
391 | pgd = pgd_offset_k(end_address); | |
392 | if (pgd_none(*pgd)) { | |
393 | end_address += PGDIR_SIZE; | |
394 | continue; | |
395 | } | |
396 | ||
397 | pud = pud_offset(pgd, end_address); | |
398 | if (pud_none(*pud)) { | |
399 | end_address += PUD_SIZE; | |
400 | continue; | |
401 | } | |
402 | ||
403 | pmd = pmd_offset(pud, end_address); | |
404 | if (pmd_none(*pmd)) { | |
405 | end_address += PMD_SIZE; | |
406 | continue; | |
407 | } | |
408 | ||
409 | pte = pte_offset_kernel(pmd, end_address); | |
410 | retry_pte: | |
411 | if (pte_none(*pte)) { | |
412 | end_address += PAGE_SIZE; | |
413 | pte++; | |
414 | if ((end_address < stop_address) && | |
415 | (end_address != ALIGN(end_address, 1UL << PMD_SHIFT))) | |
416 | goto retry_pte; | |
417 | continue; | |
418 | } | |
419 | /* Found next valid vmem_map page */ | |
420 | break; | |
421 | } while (end_address < stop_address); | |
422 | ||
423 | end_address = min(end_address, stop_address); | |
424 | end_address = end_address - (unsigned long) vmem_map + sizeof(struct page) - 1; | |
425 | hole_next_pfn = end_address / sizeof(struct page); | |
426 | return hole_next_pfn - pgdat->node_start_pfn; | |
427 | } | |
1da177e4 | 428 | |
dae28066 | 429 | int __init |
1da177e4 LT |
430 | create_mem_map_page_table (u64 start, u64 end, void *arg) |
431 | { | |
432 | unsigned long address, start_page, end_page; | |
433 | struct page *map_start, *map_end; | |
434 | int node; | |
435 | pgd_t *pgd; | |
436 | pud_t *pud; | |
437 | pmd_t *pmd; | |
438 | pte_t *pte; | |
439 | ||
440 | map_start = vmem_map + (__pa(start) >> PAGE_SHIFT); | |
441 | map_end = vmem_map + (__pa(end) >> PAGE_SHIFT); | |
442 | ||
443 | start_page = (unsigned long) map_start & PAGE_MASK; | |
444 | end_page = PAGE_ALIGN((unsigned long) map_end); | |
445 | node = paddr_to_nid(__pa(start)); | |
446 | ||
447 | for (address = start_page; address < end_page; address += PAGE_SIZE) { | |
448 | pgd = pgd_offset_k(address); | |
449 | if (pgd_none(*pgd)) | |
450 | pgd_populate(&init_mm, pgd, alloc_bootmem_pages_node(NODE_DATA(node), PAGE_SIZE)); | |
451 | pud = pud_offset(pgd, address); | |
452 | ||
453 | if (pud_none(*pud)) | |
454 | pud_populate(&init_mm, pud, alloc_bootmem_pages_node(NODE_DATA(node), PAGE_SIZE)); | |
455 | pmd = pmd_offset(pud, address); | |
456 | ||
457 | if (pmd_none(*pmd)) | |
458 | pmd_populate_kernel(&init_mm, pmd, alloc_bootmem_pages_node(NODE_DATA(node), PAGE_SIZE)); | |
459 | pte = pte_offset_kernel(pmd, address); | |
460 | ||
461 | if (pte_none(*pte)) | |
462 | set_pte(pte, pfn_pte(__pa(alloc_bootmem_pages_node(NODE_DATA(node), PAGE_SIZE)) >> PAGE_SHIFT, | |
463 | PAGE_KERNEL)); | |
464 | } | |
465 | return 0; | |
466 | } | |
467 | ||
468 | struct memmap_init_callback_data { | |
469 | struct page *start; | |
470 | struct page *end; | |
471 | int nid; | |
472 | unsigned long zone; | |
473 | }; | |
474 | ||
475 | static int | |
476 | virtual_memmap_init (u64 start, u64 end, void *arg) | |
477 | { | |
478 | struct memmap_init_callback_data *args; | |
479 | struct page *map_start, *map_end; | |
480 | ||
481 | args = (struct memmap_init_callback_data *) arg; | |
482 | map_start = vmem_map + (__pa(start) >> PAGE_SHIFT); | |
483 | map_end = vmem_map + (__pa(end) >> PAGE_SHIFT); | |
484 | ||
485 | if (map_start < args->start) | |
486 | map_start = args->start; | |
487 | if (map_end > args->end) | |
488 | map_end = args->end; | |
489 | ||
490 | /* | |
491 | * We have to initialize "out of bounds" struct page elements that fit completely | |
492 | * on the same pages that were allocated for the "in bounds" elements because they | |
493 | * may be referenced later (and found to be "reserved"). | |
494 | */ | |
495 | map_start -= ((unsigned long) map_start & (PAGE_SIZE - 1)) / sizeof(struct page); | |
496 | map_end += ((PAGE_ALIGN((unsigned long) map_end) - (unsigned long) map_end) | |
497 | / sizeof(struct page)); | |
498 | ||
499 | if (map_start < map_end) | |
500 | memmap_init_zone((unsigned long)(map_end - map_start), | |
a2f3aa02 DH |
501 | args->nid, args->zone, page_to_pfn(map_start), |
502 | MEMMAP_EARLY); | |
1da177e4 LT |
503 | return 0; |
504 | } | |
505 | ||
506 | void | |
507 | memmap_init (unsigned long size, int nid, unsigned long zone, | |
508 | unsigned long start_pfn) | |
509 | { | |
510 | if (!vmem_map) | |
a2f3aa02 | 511 | memmap_init_zone(size, nid, zone, start_pfn, MEMMAP_EARLY); |
1da177e4 LT |
512 | else { |
513 | struct page *start; | |
514 | struct memmap_init_callback_data args; | |
515 | ||
516 | start = pfn_to_page(start_pfn); | |
517 | args.start = start; | |
518 | args.end = start + size; | |
519 | args.nid = nid; | |
520 | args.zone = zone; | |
521 | ||
522 | efi_memmap_walk(virtual_memmap_init, &args); | |
523 | } | |
524 | } | |
525 | ||
526 | int | |
527 | ia64_pfn_valid (unsigned long pfn) | |
528 | { | |
529 | char byte; | |
530 | struct page *pg = pfn_to_page(pfn); | |
531 | ||
532 | return (__get_user(byte, (char __user *) pg) == 0) | |
533 | && ((((u64)pg & PAGE_MASK) == (((u64)(pg + 1) - 1) & PAGE_MASK)) | |
534 | || (__get_user(byte, (char __user *) (pg + 1) - 1) == 0)); | |
535 | } | |
536 | EXPORT_SYMBOL(ia64_pfn_valid); | |
537 | ||
dae28066 | 538 | int __init |
1da177e4 LT |
539 | find_largest_hole (u64 start, u64 end, void *arg) |
540 | { | |
541 | u64 *max_gap = arg; | |
542 | ||
543 | static u64 last_end = PAGE_OFFSET; | |
544 | ||
545 | /* NOTE: this algorithm assumes efi memmap table is ordered */ | |
546 | ||
547 | if (*max_gap < (start - last_end)) | |
548 | *max_gap = start - last_end; | |
549 | last_end = end; | |
550 | return 0; | |
551 | } | |
05e0caad | 552 | |
139b8304 BP |
553 | #endif /* CONFIG_VIRTUAL_MEM_MAP */ |
554 | ||
05e0caad | 555 | int __init |
8b9c1068 | 556 | register_active_ranges(u64 start, u64 end, void *arg) |
05e0caad | 557 | { |
139b8304 BP |
558 | int nid = paddr_to_nid(__pa(start)); |
559 | ||
560 | if (nid < 0) | |
561 | nid = 0; | |
562 | #ifdef CONFIG_KEXEC | |
563 | if (start > crashk_res.start && start < crashk_res.end) | |
564 | start = crashk_res.end; | |
565 | if (end > crashk_res.start && end < crashk_res.end) | |
566 | end = crashk_res.start; | |
567 | #endif | |
568 | ||
569 | if (start < end) | |
570 | add_active_range(nid, __pa(start) >> PAGE_SHIFT, | |
571 | __pa(end) >> PAGE_SHIFT); | |
05e0caad MG |
572 | return 0; |
573 | } | |
1da177e4 | 574 | |
dae28066 | 575 | static int __init |
1da177e4 LT |
576 | count_reserved_pages (u64 start, u64 end, void *arg) |
577 | { | |
578 | unsigned long num_reserved = 0; | |
579 | unsigned long *count = arg; | |
580 | ||
581 | for (; start < end; start += PAGE_SIZE) | |
582 | if (PageReserved(virt_to_page(start))) | |
583 | ++num_reserved; | |
584 | *count += num_reserved; | |
585 | return 0; | |
586 | } | |
587 | ||
a3f5c338 ZN |
588 | int |
589 | find_max_min_low_pfn (unsigned long start, unsigned long end, void *arg) | |
590 | { | |
591 | unsigned long pfn_start, pfn_end; | |
592 | #ifdef CONFIG_FLATMEM | |
593 | pfn_start = (PAGE_ALIGN(__pa(start))) >> PAGE_SHIFT; | |
594 | pfn_end = (PAGE_ALIGN(__pa(end - 1))) >> PAGE_SHIFT; | |
595 | #else | |
596 | pfn_start = GRANULEROUNDDOWN(__pa(start)) >> PAGE_SHIFT; | |
597 | pfn_end = GRANULEROUNDUP(__pa(end - 1)) >> PAGE_SHIFT; | |
598 | #endif | |
599 | min_low_pfn = min(min_low_pfn, pfn_start); | |
600 | max_low_pfn = max(max_low_pfn, pfn_end); | |
601 | return 0; | |
602 | } | |
603 | ||
1da177e4 LT |
604 | /* |
605 | * Boot command-line option "nolwsys" can be used to disable the use of any light-weight | |
606 | * system call handler. When this option is in effect, all fsyscalls will end up bubbling | |
607 | * down into the kernel and calling the normal (heavy-weight) syscall handler. This is | |
608 | * useful for performance testing, but conceivably could also come in handy for debugging | |
609 | * purposes. | |
610 | */ | |
611 | ||
03906ea0 | 612 | static int nolwsys __initdata; |
1da177e4 LT |
613 | |
614 | static int __init | |
615 | nolwsys_setup (char *s) | |
616 | { | |
617 | nolwsys = 1; | |
618 | return 1; | |
619 | } | |
620 | ||
621 | __setup("nolwsys", nolwsys_setup); | |
622 | ||
dae28066 | 623 | void __init |
1da177e4 LT |
624 | mem_init (void) |
625 | { | |
626 | long reserved_pages, codesize, datasize, initsize; | |
1da177e4 LT |
627 | pg_data_t *pgdat; |
628 | int i; | |
629 | static struct kcore_list kcore_mem, kcore_vmem, kcore_kernel; | |
630 | ||
fde740e4 RH |
631 | BUG_ON(PTRS_PER_PGD * sizeof(pgd_t) != PAGE_SIZE); |
632 | BUG_ON(PTRS_PER_PMD * sizeof(pmd_t) != PAGE_SIZE); | |
633 | BUG_ON(PTRS_PER_PTE * sizeof(pte_t) != PAGE_SIZE); | |
634 | ||
1da177e4 LT |
635 | #ifdef CONFIG_PCI |
636 | /* | |
637 | * This needs to be called _after_ the command line has been parsed but _before_ | |
638 | * any drivers that may need the PCI DMA interface are initialized or bootmem has | |
639 | * been freed. | |
640 | */ | |
641 | platform_dma_init(); | |
642 | #endif | |
643 | ||
2d4b1fa2 | 644 | #ifdef CONFIG_FLATMEM |
1da177e4 LT |
645 | if (!mem_map) |
646 | BUG(); | |
647 | max_mapnr = max_low_pfn; | |
648 | #endif | |
649 | ||
650 | high_memory = __va(max_low_pfn * PAGE_SIZE); | |
651 | ||
652 | kclist_add(&kcore_mem, __va(0), max_low_pfn * PAGE_SIZE); | |
653 | kclist_add(&kcore_vmem, (void *)VMALLOC_START, VMALLOC_END-VMALLOC_START); | |
654 | kclist_add(&kcore_kernel, _stext, _end - _stext); | |
655 | ||
ec936fc5 | 656 | for_each_online_pgdat(pgdat) |
564601a5 | 657 | if (pgdat->bdata->node_bootmem_map) |
658 | totalram_pages += free_all_bootmem_node(pgdat); | |
1da177e4 LT |
659 | |
660 | reserved_pages = 0; | |
661 | efi_memmap_walk(count_reserved_pages, &reserved_pages); | |
662 | ||
663 | codesize = (unsigned long) _etext - (unsigned long) _stext; | |
664 | datasize = (unsigned long) _edata - (unsigned long) _etext; | |
665 | initsize = (unsigned long) __init_end - (unsigned long) __init_begin; | |
666 | ||
667 | printk(KERN_INFO "Memory: %luk/%luk available (%luk code, %luk reserved, " | |
668 | "%luk data, %luk init)\n", (unsigned long) nr_free_pages() << (PAGE_SHIFT - 10), | |
669 | num_physpages << (PAGE_SHIFT - 10), codesize >> 10, | |
670 | reserved_pages << (PAGE_SHIFT - 10), datasize >> 10, initsize >> 10); | |
671 | ||
1da177e4 LT |
672 | |
673 | /* | |
674 | * For fsyscall entrpoints with no light-weight handler, use the ordinary | |
675 | * (heavy-weight) handler, but mark it by setting bit 0, so the fsyscall entry | |
676 | * code can tell them apart. | |
677 | */ | |
678 | for (i = 0; i < NR_syscalls; ++i) { | |
679 | extern unsigned long fsyscall_table[NR_syscalls]; | |
680 | extern unsigned long sys_call_table[NR_syscalls]; | |
681 | ||
682 | if (!fsyscall_table[i] || nolwsys) | |
683 | fsyscall_table[i] = sys_call_table[i] | 1; | |
684 | } | |
685 | setup_gate(); | |
686 | ||
687 | #ifdef CONFIG_IA32_SUPPORT | |
688 | ia32_mem_init(); | |
689 | #endif | |
690 | } | |
1681b8e1 YG |
691 | |
692 | #ifdef CONFIG_MEMORY_HOTPLUG | |
693 | void online_page(struct page *page) | |
694 | { | |
695 | ClearPageReserved(page); | |
7835e98b | 696 | init_page_count(page); |
1681b8e1 YG |
697 | __free_page(page); |
698 | totalram_pages++; | |
699 | num_physpages++; | |
700 | } | |
701 | ||
bc02af93 | 702 | int arch_add_memory(int nid, u64 start, u64 size) |
1681b8e1 YG |
703 | { |
704 | pg_data_t *pgdat; | |
705 | struct zone *zone; | |
706 | unsigned long start_pfn = start >> PAGE_SHIFT; | |
707 | unsigned long nr_pages = size >> PAGE_SHIFT; | |
708 | int ret; | |
709 | ||
bc02af93 | 710 | pgdat = NODE_DATA(nid); |
1681b8e1 YG |
711 | |
712 | zone = pgdat->node_zones + ZONE_NORMAL; | |
713 | ret = __add_pages(zone, start_pfn, nr_pages); | |
714 | ||
715 | if (ret) | |
716 | printk("%s: Problem encountered in __add_pages() as ret=%d\n", | |
717 | __FUNCTION__, ret); | |
718 | ||
719 | return ret; | |
720 | } | |
48e94196 | 721 | #ifdef CONFIG_MEMORY_HOTREMOVE |
1681b8e1 YG |
722 | int remove_memory(u64 start, u64 size) |
723 | { | |
de33b821 KH |
724 | unsigned long start_pfn, end_pfn; |
725 | unsigned long timeout = 120 * HZ; | |
726 | int ret; | |
727 | start_pfn = start >> PAGE_SHIFT; | |
728 | end_pfn = start_pfn + (size >> PAGE_SHIFT); | |
729 | ret = offline_pages(start_pfn, end_pfn, timeout); | |
730 | if (ret) | |
731 | goto out; | |
732 | /* we can free mem_map at this point */ | |
733 | out: | |
734 | return ret; | |
1681b8e1 | 735 | } |
9c576ff1 | 736 | EXPORT_SYMBOL_GPL(remove_memory); |
48e94196 | 737 | #endif /* CONFIG_MEMORY_HOTREMOVE */ |
1681b8e1 | 738 | #endif |