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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; | |
61 | ||
1da177e4 LT |
62 | page = pte_page(pte); |
63 | addr = (unsigned long) page_address(page); | |
64 | ||
65 | if (test_bit(PG_arch_1, &page->flags)) | |
66 | return; /* i-cache is already coherent with d-cache */ | |
67 | ||
273988fa | 68 | flush_icache_range(addr, addr + (PAGE_SIZE << compound_order(page))); |
1da177e4 LT |
69 | set_bit(PG_arch_1, &page->flags); /* mark page as clean */ |
70 | } | |
71 | ||
cde14bbf JB |
72 | /* |
73 | * Since DMA is i-cache coherent, any (complete) pages that were written via | |
74 | * DMA can be marked as "clean" so that lazy_mmu_prot_update() doesn't have to | |
75 | * flush them when they get mapped into an executable vm-area. | |
76 | */ | |
77 | void | |
78 | dma_mark_clean(void *addr, size_t size) | |
79 | { | |
80 | unsigned long pg_addr, end; | |
81 | ||
82 | pg_addr = PAGE_ALIGN((unsigned long) addr); | |
83 | end = (unsigned long) addr + size; | |
84 | while (pg_addr + PAGE_SIZE <= end) { | |
85 | struct page *page = virt_to_page(pg_addr); | |
86 | set_bit(PG_arch_1, &page->flags); | |
87 | pg_addr += PAGE_SIZE; | |
88 | } | |
89 | } | |
90 | ||
1da177e4 LT |
91 | inline void |
92 | ia64_set_rbs_bot (void) | |
93 | { | |
94 | unsigned long stack_size = current->signal->rlim[RLIMIT_STACK].rlim_max & -16; | |
95 | ||
96 | if (stack_size > MAX_USER_STACK_SIZE) | |
97 | stack_size = MAX_USER_STACK_SIZE; | |
83d2cd3d | 98 | current->thread.rbs_bot = PAGE_ALIGN(current->mm->start_stack - stack_size); |
1da177e4 LT |
99 | } |
100 | ||
101 | /* | |
102 | * This performs some platform-dependent address space initialization. | |
103 | * On IA-64, we want to setup the VM area for the register backing | |
104 | * store (which grows upwards) and install the gateway page which is | |
105 | * used for signal trampolines, etc. | |
106 | */ | |
107 | void | |
108 | ia64_init_addr_space (void) | |
109 | { | |
110 | struct vm_area_struct *vma; | |
111 | ||
112 | ia64_set_rbs_bot(); | |
113 | ||
114 | /* | |
115 | * If we're out of memory and kmem_cache_alloc() returns NULL, we simply ignore | |
116 | * the problem. When the process attempts to write to the register backing store | |
117 | * for the first time, it will get a SEGFAULT in this case. | |
118 | */ | |
c3762229 | 119 | vma = kmem_cache_zalloc(vm_area_cachep, GFP_KERNEL); |
1da177e4 | 120 | if (vma) { |
1da177e4 LT |
121 | vma->vm_mm = current->mm; |
122 | vma->vm_start = current->thread.rbs_bot & PAGE_MASK; | |
123 | vma->vm_end = vma->vm_start + PAGE_SIZE; | |
46dea3d0 | 124 | vma->vm_flags = VM_DATA_DEFAULT_FLAGS|VM_GROWSUP|VM_ACCOUNT; |
3ed75eb8 | 125 | vma->vm_page_prot = vm_get_page_prot(vma->vm_flags); |
1da177e4 LT |
126 | down_write(¤t->mm->mmap_sem); |
127 | if (insert_vm_struct(current->mm, vma)) { | |
128 | up_write(¤t->mm->mmap_sem); | |
129 | kmem_cache_free(vm_area_cachep, vma); | |
130 | return; | |
131 | } | |
132 | up_write(¤t->mm->mmap_sem); | |
133 | } | |
134 | ||
135 | /* map NaT-page at address zero to speed up speculative dereferencing of NULL: */ | |
136 | if (!(current->personality & MMAP_PAGE_ZERO)) { | |
c3762229 | 137 | vma = kmem_cache_zalloc(vm_area_cachep, GFP_KERNEL); |
1da177e4 | 138 | if (vma) { |
1da177e4 LT |
139 | vma->vm_mm = current->mm; |
140 | vma->vm_end = PAGE_SIZE; | |
141 | vma->vm_page_prot = __pgprot(pgprot_val(PAGE_READONLY) | _PAGE_MA_NAT); | |
142 | vma->vm_flags = VM_READ | VM_MAYREAD | VM_IO | VM_RESERVED; | |
143 | down_write(¤t->mm->mmap_sem); | |
144 | if (insert_vm_struct(current->mm, vma)) { | |
145 | up_write(¤t->mm->mmap_sem); | |
146 | kmem_cache_free(vm_area_cachep, vma); | |
147 | return; | |
148 | } | |
149 | up_write(¤t->mm->mmap_sem); | |
150 | } | |
151 | } | |
152 | } | |
153 | ||
154 | void | |
155 | free_initmem (void) | |
156 | { | |
157 | unsigned long addr, eaddr; | |
158 | ||
159 | addr = (unsigned long) ia64_imva(__init_begin); | |
160 | eaddr = (unsigned long) ia64_imva(__init_end); | |
161 | while (addr < eaddr) { | |
162 | ClearPageReserved(virt_to_page(addr)); | |
7835e98b | 163 | init_page_count(virt_to_page(addr)); |
1da177e4 LT |
164 | free_page(addr); |
165 | ++totalram_pages; | |
166 | addr += PAGE_SIZE; | |
167 | } | |
168 | printk(KERN_INFO "Freeing unused kernel memory: %ldkB freed\n", | |
169 | (__init_end - __init_begin) >> 10); | |
170 | } | |
171 | ||
dae28066 | 172 | void __init |
1da177e4 LT |
173 | free_initrd_mem (unsigned long start, unsigned long end) |
174 | { | |
175 | struct page *page; | |
176 | /* | |
177 | * EFI uses 4KB pages while the kernel can use 4KB or bigger. | |
178 | * Thus EFI and the kernel may have different page sizes. It is | |
179 | * therefore possible to have the initrd share the same page as | |
180 | * the end of the kernel (given current setup). | |
181 | * | |
182 | * To avoid freeing/using the wrong page (kernel sized) we: | |
183 | * - align up the beginning of initrd | |
184 | * - align down the end of initrd | |
185 | * | |
186 | * | | | |
187 | * |=============| a000 | |
188 | * | | | |
189 | * | | | |
190 | * | | 9000 | |
191 | * |/////////////| | |
192 | * |/////////////| | |
193 | * |=============| 8000 | |
194 | * |///INITRD////| | |
195 | * |/////////////| | |
196 | * |/////////////| 7000 | |
197 | * | | | |
198 | * |KKKKKKKKKKKKK| | |
199 | * |=============| 6000 | |
200 | * |KKKKKKKKKKKKK| | |
201 | * |KKKKKKKKKKKKK| | |
202 | * K=kernel using 8KB pages | |
203 | * | |
204 | * In this example, we must free page 8000 ONLY. So we must align up | |
205 | * initrd_start and keep initrd_end as is. | |
206 | */ | |
207 | start = PAGE_ALIGN(start); | |
208 | end = end & PAGE_MASK; | |
209 | ||
210 | if (start < end) | |
211 | printk(KERN_INFO "Freeing initrd memory: %ldkB freed\n", (end - start) >> 10); | |
212 | ||
213 | for (; start < end; start += PAGE_SIZE) { | |
214 | if (!virt_addr_valid(start)) | |
215 | continue; | |
216 | page = virt_to_page(start); | |
217 | ClearPageReserved(page); | |
7835e98b | 218 | init_page_count(page); |
1da177e4 LT |
219 | free_page(start); |
220 | ++totalram_pages; | |
221 | } | |
222 | } | |
223 | ||
224 | /* | |
225 | * This installs a clean page in the kernel's page table. | |
226 | */ | |
dae28066 | 227 | static struct page * __init |
1da177e4 LT |
228 | put_kernel_page (struct page *page, unsigned long address, pgprot_t pgprot) |
229 | { | |
230 | pgd_t *pgd; | |
231 | pud_t *pud; | |
232 | pmd_t *pmd; | |
233 | pte_t *pte; | |
234 | ||
235 | if (!PageReserved(page)) | |
236 | printk(KERN_ERR "put_kernel_page: page at 0x%p not in reserved memory\n", | |
237 | page_address(page)); | |
238 | ||
239 | pgd = pgd_offset_k(address); /* note: this is NOT pgd_offset()! */ | |
240 | ||
1da177e4 LT |
241 | { |
242 | pud = pud_alloc(&init_mm, pgd, address); | |
243 | if (!pud) | |
244 | goto out; | |
1da177e4 LT |
245 | pmd = pmd_alloc(&init_mm, pud, address); |
246 | if (!pmd) | |
247 | goto out; | |
872fec16 | 248 | pte = pte_alloc_kernel(pmd, address); |
1da177e4 LT |
249 | if (!pte) |
250 | goto out; | |
872fec16 | 251 | if (!pte_none(*pte)) |
1da177e4 | 252 | goto out; |
1da177e4 | 253 | set_pte(pte, mk_pte(page, pgprot)); |
1da177e4 | 254 | } |
872fec16 | 255 | out: |
1da177e4 LT |
256 | /* no need for flush_tlb */ |
257 | return page; | |
258 | } | |
259 | ||
914a4ea4 | 260 | static void __init |
1da177e4 LT |
261 | setup_gate (void) |
262 | { | |
263 | struct page *page; | |
264 | ||
265 | /* | |
ad597bd5 DMT |
266 | * Map the gate page twice: once read-only to export the ELF |
267 | * headers etc. and once execute-only page to enable | |
268 | * privilege-promotion via "epc": | |
1da177e4 LT |
269 | */ |
270 | page = virt_to_page(ia64_imva(__start_gate_section)); | |
271 | put_kernel_page(page, GATE_ADDR, PAGE_READONLY); | |
272 | #ifdef HAVE_BUGGY_SEGREL | |
273 | page = virt_to_page(ia64_imva(__start_gate_section + PAGE_SIZE)); | |
274 | put_kernel_page(page, GATE_ADDR + PAGE_SIZE, PAGE_GATE); | |
275 | #else | |
276 | put_kernel_page(page, GATE_ADDR + PERCPU_PAGE_SIZE, PAGE_GATE); | |
ad597bd5 DMT |
277 | /* Fill in the holes (if any) with read-only zero pages: */ |
278 | { | |
279 | unsigned long addr; | |
280 | ||
281 | for (addr = GATE_ADDR + PAGE_SIZE; | |
282 | addr < GATE_ADDR + PERCPU_PAGE_SIZE; | |
283 | addr += PAGE_SIZE) | |
284 | { | |
285 | put_kernel_page(ZERO_PAGE(0), addr, | |
286 | PAGE_READONLY); | |
287 | put_kernel_page(ZERO_PAGE(0), addr + PERCPU_PAGE_SIZE, | |
288 | PAGE_READONLY); | |
289 | } | |
290 | } | |
1da177e4 LT |
291 | #endif |
292 | ia64_patch_gate(); | |
293 | } | |
294 | ||
295 | void __devinit | |
296 | ia64_mmu_init (void *my_cpu_data) | |
297 | { | |
00b65985 | 298 | unsigned long pta, impl_va_bits; |
1da177e4 LT |
299 | extern void __devinit tlb_init (void); |
300 | ||
301 | #ifdef CONFIG_DISABLE_VHPT | |
302 | # define VHPT_ENABLE_BIT 0 | |
303 | #else | |
304 | # define VHPT_ENABLE_BIT 1 | |
305 | #endif | |
306 | ||
1da177e4 LT |
307 | /* |
308 | * Check if the virtually mapped linear page table (VMLPT) overlaps with a mapped | |
309 | * address space. The IA-64 architecture guarantees that at least 50 bits of | |
310 | * virtual address space are implemented but if we pick a large enough page size | |
311 | * (e.g., 64KB), the mapped address space is big enough that it will overlap with | |
312 | * VMLPT. I assume that once we run on machines big enough to warrant 64KB pages, | |
313 | * IMPL_VA_MSB will be significantly bigger, so this is unlikely to become a | |
314 | * problem in practice. Alternatively, we could truncate the top of the mapped | |
315 | * address space to not permit mappings that would overlap with the VMLPT. | |
316 | * --davidm 00/12/06 | |
317 | */ | |
318 | # define pte_bits 3 | |
319 | # define mapped_space_bits (3*(PAGE_SHIFT - pte_bits) + PAGE_SHIFT) | |
320 | /* | |
321 | * The virtual page table has to cover the entire implemented address space within | |
322 | * a region even though not all of this space may be mappable. The reason for | |
323 | * this is that the Access bit and Dirty bit fault handlers perform | |
324 | * non-speculative accesses to the virtual page table, so the address range of the | |
325 | * virtual page table itself needs to be covered by virtual page table. | |
326 | */ | |
327 | # define vmlpt_bits (impl_va_bits - PAGE_SHIFT + pte_bits) | |
328 | # define POW2(n) (1ULL << (n)) | |
329 | ||
330 | impl_va_bits = ffz(~(local_cpu_data->unimpl_va_mask | (7UL << 61))); | |
331 | ||
332 | if (impl_va_bits < 51 || impl_va_bits > 61) | |
333 | panic("CPU has bogus IMPL_VA_MSB value of %lu!\n", impl_va_bits - 1); | |
6cf07a8c PC |
334 | /* |
335 | * mapped_space_bits - PAGE_SHIFT is the total number of ptes we need, | |
336 | * which must fit into "vmlpt_bits - pte_bits" slots. Second half of | |
337 | * the test makes sure that our mapped space doesn't overlap the | |
338 | * unimplemented hole in the middle of the region. | |
339 | */ | |
340 | if ((mapped_space_bits - PAGE_SHIFT > vmlpt_bits - pte_bits) || | |
341 | (mapped_space_bits > impl_va_bits - 1)) | |
342 | panic("Cannot build a big enough virtual-linear page table" | |
343 | " to cover mapped address space.\n" | |
344 | " Try using a smaller page size.\n"); | |
345 | ||
1da177e4 LT |
346 | |
347 | /* place the VMLPT at the end of each page-table mapped region: */ | |
348 | pta = POW2(61) - POW2(vmlpt_bits); | |
349 | ||
1da177e4 LT |
350 | /* |
351 | * Set the (virtually mapped linear) page table address. Bit | |
352 | * 8 selects between the short and long format, bits 2-7 the | |
353 | * size of the table, and bit 0 whether the VHPT walker is | |
354 | * enabled. | |
355 | */ | |
356 | ia64_set_pta(pta | (0 << 8) | (vmlpt_bits << 2) | VHPT_ENABLE_BIT); | |
357 | ||
358 | ia64_tlb_init(); | |
359 | ||
360 | #ifdef CONFIG_HUGETLB_PAGE | |
361 | ia64_set_rr(HPAGE_REGION_BASE, HPAGE_SHIFT << 2); | |
362 | ia64_srlz_d(); | |
363 | #endif | |
364 | } | |
365 | ||
366 | #ifdef CONFIG_VIRTUAL_MEM_MAP | |
e44e41d0 BP |
367 | int vmemmap_find_next_valid_pfn(int node, int i) |
368 | { | |
369 | unsigned long end_address, hole_next_pfn; | |
370 | unsigned long stop_address; | |
371 | pg_data_t *pgdat = NODE_DATA(node); | |
372 | ||
373 | end_address = (unsigned long) &vmem_map[pgdat->node_start_pfn + i]; | |
374 | end_address = PAGE_ALIGN(end_address); | |
375 | ||
376 | stop_address = (unsigned long) &vmem_map[ | |
377 | pgdat->node_start_pfn + pgdat->node_spanned_pages]; | |
378 | ||
379 | do { | |
380 | pgd_t *pgd; | |
381 | pud_t *pud; | |
382 | pmd_t *pmd; | |
383 | pte_t *pte; | |
384 | ||
385 | pgd = pgd_offset_k(end_address); | |
386 | if (pgd_none(*pgd)) { | |
387 | end_address += PGDIR_SIZE; | |
388 | continue; | |
389 | } | |
390 | ||
391 | pud = pud_offset(pgd, end_address); | |
392 | if (pud_none(*pud)) { | |
393 | end_address += PUD_SIZE; | |
394 | continue; | |
395 | } | |
396 | ||
397 | pmd = pmd_offset(pud, end_address); | |
398 | if (pmd_none(*pmd)) { | |
399 | end_address += PMD_SIZE; | |
400 | continue; | |
401 | } | |
402 | ||
403 | pte = pte_offset_kernel(pmd, end_address); | |
404 | retry_pte: | |
405 | if (pte_none(*pte)) { | |
406 | end_address += PAGE_SIZE; | |
407 | pte++; | |
408 | if ((end_address < stop_address) && | |
409 | (end_address != ALIGN(end_address, 1UL << PMD_SHIFT))) | |
410 | goto retry_pte; | |
411 | continue; | |
412 | } | |
413 | /* Found next valid vmem_map page */ | |
414 | break; | |
415 | } while (end_address < stop_address); | |
416 | ||
417 | end_address = min(end_address, stop_address); | |
418 | end_address = end_address - (unsigned long) vmem_map + sizeof(struct page) - 1; | |
419 | hole_next_pfn = end_address / sizeof(struct page); | |
420 | return hole_next_pfn - pgdat->node_start_pfn; | |
421 | } | |
1da177e4 | 422 | |
dae28066 | 423 | int __init |
1da177e4 LT |
424 | create_mem_map_page_table (u64 start, u64 end, void *arg) |
425 | { | |
426 | unsigned long address, start_page, end_page; | |
427 | struct page *map_start, *map_end; | |
428 | int node; | |
429 | pgd_t *pgd; | |
430 | pud_t *pud; | |
431 | pmd_t *pmd; | |
432 | pte_t *pte; | |
433 | ||
434 | map_start = vmem_map + (__pa(start) >> PAGE_SHIFT); | |
435 | map_end = vmem_map + (__pa(end) >> PAGE_SHIFT); | |
436 | ||
437 | start_page = (unsigned long) map_start & PAGE_MASK; | |
438 | end_page = PAGE_ALIGN((unsigned long) map_end); | |
439 | node = paddr_to_nid(__pa(start)); | |
440 | ||
441 | for (address = start_page; address < end_page; address += PAGE_SIZE) { | |
442 | pgd = pgd_offset_k(address); | |
443 | if (pgd_none(*pgd)) | |
444 | pgd_populate(&init_mm, pgd, alloc_bootmem_pages_node(NODE_DATA(node), PAGE_SIZE)); | |
445 | pud = pud_offset(pgd, address); | |
446 | ||
447 | if (pud_none(*pud)) | |
448 | pud_populate(&init_mm, pud, alloc_bootmem_pages_node(NODE_DATA(node), PAGE_SIZE)); | |
449 | pmd = pmd_offset(pud, address); | |
450 | ||
451 | if (pmd_none(*pmd)) | |
452 | pmd_populate_kernel(&init_mm, pmd, alloc_bootmem_pages_node(NODE_DATA(node), PAGE_SIZE)); | |
453 | pte = pte_offset_kernel(pmd, address); | |
454 | ||
455 | if (pte_none(*pte)) | |
456 | set_pte(pte, pfn_pte(__pa(alloc_bootmem_pages_node(NODE_DATA(node), PAGE_SIZE)) >> PAGE_SHIFT, | |
457 | PAGE_KERNEL)); | |
458 | } | |
459 | return 0; | |
460 | } | |
461 | ||
462 | struct memmap_init_callback_data { | |
463 | struct page *start; | |
464 | struct page *end; | |
465 | int nid; | |
466 | unsigned long zone; | |
467 | }; | |
468 | ||
18b8befd | 469 | static int __meminit |
1da177e4 LT |
470 | virtual_memmap_init (u64 start, u64 end, void *arg) |
471 | { | |
472 | struct memmap_init_callback_data *args; | |
473 | struct page *map_start, *map_end; | |
474 | ||
475 | args = (struct memmap_init_callback_data *) arg; | |
476 | map_start = vmem_map + (__pa(start) >> PAGE_SHIFT); | |
477 | map_end = vmem_map + (__pa(end) >> PAGE_SHIFT); | |
478 | ||
479 | if (map_start < args->start) | |
480 | map_start = args->start; | |
481 | if (map_end > args->end) | |
482 | map_end = args->end; | |
483 | ||
484 | /* | |
485 | * We have to initialize "out of bounds" struct page elements that fit completely | |
486 | * on the same pages that were allocated for the "in bounds" elements because they | |
487 | * may be referenced later (and found to be "reserved"). | |
488 | */ | |
489 | map_start -= ((unsigned long) map_start & (PAGE_SIZE - 1)) / sizeof(struct page); | |
490 | map_end += ((PAGE_ALIGN((unsigned long) map_end) - (unsigned long) map_end) | |
491 | / sizeof(struct page)); | |
492 | ||
493 | if (map_start < map_end) | |
494 | memmap_init_zone((unsigned long)(map_end - map_start), | |
a2f3aa02 DH |
495 | args->nid, args->zone, page_to_pfn(map_start), |
496 | MEMMAP_EARLY); | |
1da177e4 LT |
497 | return 0; |
498 | } | |
499 | ||
18b8befd | 500 | void __meminit |
1da177e4 LT |
501 | memmap_init (unsigned long size, int nid, unsigned long zone, |
502 | unsigned long start_pfn) | |
503 | { | |
504 | if (!vmem_map) | |
a2f3aa02 | 505 | memmap_init_zone(size, nid, zone, start_pfn, MEMMAP_EARLY); |
1da177e4 LT |
506 | else { |
507 | struct page *start; | |
508 | struct memmap_init_callback_data args; | |
509 | ||
510 | start = pfn_to_page(start_pfn); | |
511 | args.start = start; | |
512 | args.end = start + size; | |
513 | args.nid = nid; | |
514 | args.zone = zone; | |
515 | ||
516 | efi_memmap_walk(virtual_memmap_init, &args); | |
517 | } | |
518 | } | |
519 | ||
520 | int | |
521 | ia64_pfn_valid (unsigned long pfn) | |
522 | { | |
523 | char byte; | |
524 | struct page *pg = pfn_to_page(pfn); | |
525 | ||
526 | return (__get_user(byte, (char __user *) pg) == 0) | |
527 | && ((((u64)pg & PAGE_MASK) == (((u64)(pg + 1) - 1) & PAGE_MASK)) | |
528 | || (__get_user(byte, (char __user *) (pg + 1) - 1) == 0)); | |
529 | } | |
530 | EXPORT_SYMBOL(ia64_pfn_valid); | |
531 | ||
dae28066 | 532 | int __init |
1da177e4 LT |
533 | find_largest_hole (u64 start, u64 end, void *arg) |
534 | { | |
535 | u64 *max_gap = arg; | |
536 | ||
537 | static u64 last_end = PAGE_OFFSET; | |
538 | ||
539 | /* NOTE: this algorithm assumes efi memmap table is ordered */ | |
540 | ||
541 | if (*max_gap < (start - last_end)) | |
542 | *max_gap = start - last_end; | |
543 | last_end = end; | |
544 | return 0; | |
545 | } | |
05e0caad | 546 | |
139b8304 BP |
547 | #endif /* CONFIG_VIRTUAL_MEM_MAP */ |
548 | ||
05e0caad | 549 | int __init |
98075d24 | 550 | register_active_ranges(u64 start, u64 len, int nid) |
05e0caad | 551 | { |
98075d24 | 552 | u64 end = start + len; |
139b8304 | 553 | |
139b8304 BP |
554 | #ifdef CONFIG_KEXEC |
555 | if (start > crashk_res.start && start < crashk_res.end) | |
556 | start = crashk_res.end; | |
557 | if (end > crashk_res.start && end < crashk_res.end) | |
558 | end = crashk_res.start; | |
559 | #endif | |
560 | ||
561 | if (start < end) | |
562 | add_active_range(nid, __pa(start) >> PAGE_SHIFT, | |
563 | __pa(end) >> PAGE_SHIFT); | |
05e0caad MG |
564 | return 0; |
565 | } | |
1da177e4 | 566 | |
dae28066 | 567 | static int __init |
1da177e4 LT |
568 | count_reserved_pages (u64 start, u64 end, void *arg) |
569 | { | |
570 | unsigned long num_reserved = 0; | |
571 | unsigned long *count = arg; | |
572 | ||
573 | for (; start < end; start += PAGE_SIZE) | |
574 | if (PageReserved(virt_to_page(start))) | |
575 | ++num_reserved; | |
576 | *count += num_reserved; | |
577 | return 0; | |
578 | } | |
579 | ||
a3f5c338 ZN |
580 | int |
581 | find_max_min_low_pfn (unsigned long start, unsigned long end, void *arg) | |
582 | { | |
583 | unsigned long pfn_start, pfn_end; | |
584 | #ifdef CONFIG_FLATMEM | |
585 | pfn_start = (PAGE_ALIGN(__pa(start))) >> PAGE_SHIFT; | |
586 | pfn_end = (PAGE_ALIGN(__pa(end - 1))) >> PAGE_SHIFT; | |
587 | #else | |
588 | pfn_start = GRANULEROUNDDOWN(__pa(start)) >> PAGE_SHIFT; | |
589 | pfn_end = GRANULEROUNDUP(__pa(end - 1)) >> PAGE_SHIFT; | |
590 | #endif | |
591 | min_low_pfn = min(min_low_pfn, pfn_start); | |
592 | max_low_pfn = max(max_low_pfn, pfn_end); | |
593 | return 0; | |
594 | } | |
595 | ||
1da177e4 LT |
596 | /* |
597 | * Boot command-line option "nolwsys" can be used to disable the use of any light-weight | |
598 | * system call handler. When this option is in effect, all fsyscalls will end up bubbling | |
599 | * down into the kernel and calling the normal (heavy-weight) syscall handler. This is | |
600 | * useful for performance testing, but conceivably could also come in handy for debugging | |
601 | * purposes. | |
602 | */ | |
603 | ||
03906ea0 | 604 | static int nolwsys __initdata; |
1da177e4 LT |
605 | |
606 | static int __init | |
607 | nolwsys_setup (char *s) | |
608 | { | |
609 | nolwsys = 1; | |
610 | return 1; | |
611 | } | |
612 | ||
613 | __setup("nolwsys", nolwsys_setup); | |
614 | ||
dae28066 | 615 | void __init |
1da177e4 LT |
616 | mem_init (void) |
617 | { | |
618 | long reserved_pages, codesize, datasize, initsize; | |
1da177e4 LT |
619 | pg_data_t *pgdat; |
620 | int i; | |
621 | static struct kcore_list kcore_mem, kcore_vmem, kcore_kernel; | |
622 | ||
fde740e4 RH |
623 | BUG_ON(PTRS_PER_PGD * sizeof(pgd_t) != PAGE_SIZE); |
624 | BUG_ON(PTRS_PER_PMD * sizeof(pmd_t) != PAGE_SIZE); | |
625 | BUG_ON(PTRS_PER_PTE * sizeof(pte_t) != PAGE_SIZE); | |
626 | ||
1da177e4 LT |
627 | #ifdef CONFIG_PCI |
628 | /* | |
629 | * This needs to be called _after_ the command line has been parsed but _before_ | |
630 | * any drivers that may need the PCI DMA interface are initialized or bootmem has | |
631 | * been freed. | |
632 | */ | |
633 | platform_dma_init(); | |
634 | #endif | |
635 | ||
2d4b1fa2 | 636 | #ifdef CONFIG_FLATMEM |
1da177e4 LT |
637 | if (!mem_map) |
638 | BUG(); | |
639 | max_mapnr = max_low_pfn; | |
640 | #endif | |
641 | ||
642 | high_memory = __va(max_low_pfn * PAGE_SIZE); | |
643 | ||
644 | kclist_add(&kcore_mem, __va(0), max_low_pfn * PAGE_SIZE); | |
645 | kclist_add(&kcore_vmem, (void *)VMALLOC_START, VMALLOC_END-VMALLOC_START); | |
646 | kclist_add(&kcore_kernel, _stext, _end - _stext); | |
647 | ||
ec936fc5 | 648 | for_each_online_pgdat(pgdat) |
564601a5 | 649 | if (pgdat->bdata->node_bootmem_map) |
650 | totalram_pages += free_all_bootmem_node(pgdat); | |
1da177e4 LT |
651 | |
652 | reserved_pages = 0; | |
653 | efi_memmap_walk(count_reserved_pages, &reserved_pages); | |
654 | ||
655 | codesize = (unsigned long) _etext - (unsigned long) _stext; | |
656 | datasize = (unsigned long) _edata - (unsigned long) _etext; | |
657 | initsize = (unsigned long) __init_end - (unsigned long) __init_begin; | |
658 | ||
659 | printk(KERN_INFO "Memory: %luk/%luk available (%luk code, %luk reserved, " | |
660 | "%luk data, %luk init)\n", (unsigned long) nr_free_pages() << (PAGE_SHIFT - 10), | |
661 | num_physpages << (PAGE_SHIFT - 10), codesize >> 10, | |
662 | reserved_pages << (PAGE_SHIFT - 10), datasize >> 10, initsize >> 10); | |
663 | ||
1da177e4 LT |
664 | |
665 | /* | |
666 | * For fsyscall entrpoints with no light-weight handler, use the ordinary | |
667 | * (heavy-weight) handler, but mark it by setting bit 0, so the fsyscall entry | |
668 | * code can tell them apart. | |
669 | */ | |
670 | for (i = 0; i < NR_syscalls; ++i) { | |
671 | extern unsigned long fsyscall_table[NR_syscalls]; | |
672 | extern unsigned long sys_call_table[NR_syscalls]; | |
673 | ||
674 | if (!fsyscall_table[i] || nolwsys) | |
675 | fsyscall_table[i] = sys_call_table[i] | 1; | |
676 | } | |
677 | setup_gate(); | |
678 | ||
679 | #ifdef CONFIG_IA32_SUPPORT | |
680 | ia32_mem_init(); | |
681 | #endif | |
682 | } | |
1681b8e1 YG |
683 | |
684 | #ifdef CONFIG_MEMORY_HOTPLUG | |
bc02af93 | 685 | int arch_add_memory(int nid, u64 start, u64 size) |
1681b8e1 YG |
686 | { |
687 | pg_data_t *pgdat; | |
688 | struct zone *zone; | |
689 | unsigned long start_pfn = start >> PAGE_SHIFT; | |
690 | unsigned long nr_pages = size >> PAGE_SHIFT; | |
691 | int ret; | |
692 | ||
bc02af93 | 693 | pgdat = NODE_DATA(nid); |
1681b8e1 YG |
694 | |
695 | zone = pgdat->node_zones + ZONE_NORMAL; | |
696 | ret = __add_pages(zone, start_pfn, nr_pages); | |
697 | ||
698 | if (ret) | |
699 | printk("%s: Problem encountered in __add_pages() as ret=%d\n", | |
d4ed8084 | 700 | __func__, ret); |
1681b8e1 YG |
701 | |
702 | return ret; | |
703 | } | |
48e94196 | 704 | #ifdef CONFIG_MEMORY_HOTREMOVE |
1681b8e1 YG |
705 | int remove_memory(u64 start, u64 size) |
706 | { | |
de33b821 KH |
707 | unsigned long start_pfn, end_pfn; |
708 | unsigned long timeout = 120 * HZ; | |
709 | int ret; | |
710 | start_pfn = start >> PAGE_SHIFT; | |
711 | end_pfn = start_pfn + (size >> PAGE_SHIFT); | |
712 | ret = offline_pages(start_pfn, end_pfn, timeout); | |
713 | if (ret) | |
714 | goto out; | |
715 | /* we can free mem_map at this point */ | |
716 | out: | |
717 | return ret; | |
1681b8e1 | 718 | } |
9c576ff1 | 719 | EXPORT_SYMBOL_GPL(remove_memory); |
48e94196 | 720 | #endif /* CONFIG_MEMORY_HOTREMOVE */ |
1681b8e1 | 721 | #endif |