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> | |
98e4ae8a | 13 | #include <linux/memblock.h> |
1da177e4 LT |
14 | #include <linux/mm.h> |
15 | #include <linux/mmzone.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/personality.h> | |
18 | #include <linux/reboot.h> | |
19 | #include <linux/slab.h> | |
20 | #include <linux/swap.h> | |
21 | #include <linux/proc_fs.h> | |
22 | #include <linux/bitops.h> | |
139b8304 | 23 | #include <linux/kexec.h> |
1da177e4 | 24 | |
1da177e4 | 25 | #include <asm/dma.h> |
1da177e4 LT |
26 | #include <asm/io.h> |
27 | #include <asm/machvec.h> | |
28 | #include <asm/numa.h> | |
29 | #include <asm/patch.h> | |
30 | #include <asm/pgalloc.h> | |
31 | #include <asm/sal.h> | |
32 | #include <asm/sections.h> | |
1da177e4 LT |
33 | #include <asm/tlb.h> |
34 | #include <asm/uaccess.h> | |
35 | #include <asm/unistd.h> | |
36 | #include <asm/mca.h> | |
dd97d5cb | 37 | #include <asm/paravirt.h> |
1da177e4 | 38 | |
1da177e4 LT |
39 | extern void ia64_tlb_init (void); |
40 | ||
41 | unsigned long MAX_DMA_ADDRESS = PAGE_OFFSET + 0x100000000UL; | |
42 | ||
43 | #ifdef CONFIG_VIRTUAL_MEM_MAP | |
126b3fcd TH |
44 | unsigned long VMALLOC_END = VMALLOC_END_INIT; |
45 | EXPORT_SYMBOL(VMALLOC_END); | |
1da177e4 LT |
46 | struct page *vmem_map; |
47 | EXPORT_SYMBOL(vmem_map); | |
48 | #endif | |
49 | ||
fde740e4 | 50 | struct page *zero_page_memmap_ptr; /* map entry for zero page */ |
1da177e4 LT |
51 | EXPORT_SYMBOL(zero_page_memmap_ptr); |
52 | ||
1da177e4 | 53 | void |
954ffcb3 | 54 | __ia64_sync_icache_dcache (pte_t pte) |
1da177e4 LT |
55 | { |
56 | unsigned long addr; | |
57 | struct page *page; | |
58 | ||
1da177e4 LT |
59 | page = pte_page(pte); |
60 | addr = (unsigned long) page_address(page); | |
61 | ||
62 | if (test_bit(PG_arch_1, &page->flags)) | |
63 | return; /* i-cache is already coherent with d-cache */ | |
64 | ||
273988fa | 65 | flush_icache_range(addr, addr + (PAGE_SIZE << compound_order(page))); |
1da177e4 LT |
66 | set_bit(PG_arch_1, &page->flags); /* mark page as clean */ |
67 | } | |
68 | ||
cde14bbf JB |
69 | /* |
70 | * Since DMA is i-cache coherent, any (complete) pages that were written via | |
71 | * DMA can be marked as "clean" so that lazy_mmu_prot_update() doesn't have to | |
72 | * flush them when they get mapped into an executable vm-area. | |
73 | */ | |
74 | void | |
75 | dma_mark_clean(void *addr, size_t size) | |
76 | { | |
77 | unsigned long pg_addr, end; | |
78 | ||
79 | pg_addr = PAGE_ALIGN((unsigned long) addr); | |
80 | end = (unsigned long) addr + size; | |
81 | while (pg_addr + PAGE_SIZE <= end) { | |
82 | struct page *page = virt_to_page(pg_addr); | |
83 | set_bit(PG_arch_1, &page->flags); | |
84 | pg_addr += PAGE_SIZE; | |
85 | } | |
86 | } | |
87 | ||
1da177e4 LT |
88 | inline void |
89 | ia64_set_rbs_bot (void) | |
90 | { | |
02b763b8 | 91 | unsigned long stack_size = rlimit_max(RLIMIT_STACK) & -16; |
1da177e4 LT |
92 | |
93 | if (stack_size > MAX_USER_STACK_SIZE) | |
94 | stack_size = MAX_USER_STACK_SIZE; | |
83d2cd3d | 95 | current->thread.rbs_bot = PAGE_ALIGN(current->mm->start_stack - stack_size); |
1da177e4 LT |
96 | } |
97 | ||
98 | /* | |
99 | * This performs some platform-dependent address space initialization. | |
100 | * On IA-64, we want to setup the VM area for the register backing | |
101 | * store (which grows upwards) and install the gateway page which is | |
102 | * used for signal trampolines, etc. | |
103 | */ | |
104 | void | |
105 | ia64_init_addr_space (void) | |
106 | { | |
107 | struct vm_area_struct *vma; | |
108 | ||
109 | ia64_set_rbs_bot(); | |
110 | ||
111 | /* | |
112 | * If we're out of memory and kmem_cache_alloc() returns NULL, we simply ignore | |
113 | * the problem. When the process attempts to write to the register backing store | |
114 | * for the first time, it will get a SEGFAULT in this case. | |
115 | */ | |
c3762229 | 116 | vma = kmem_cache_zalloc(vm_area_cachep, GFP_KERNEL); |
1da177e4 | 117 | if (vma) { |
5beb4930 | 118 | INIT_LIST_HEAD(&vma->anon_vma_chain); |
1da177e4 LT |
119 | vma->vm_mm = current->mm; |
120 | vma->vm_start = current->thread.rbs_bot & PAGE_MASK; | |
121 | vma->vm_end = vma->vm_start + PAGE_SIZE; | |
46dea3d0 | 122 | vma->vm_flags = VM_DATA_DEFAULT_FLAGS|VM_GROWSUP|VM_ACCOUNT; |
3ed75eb8 | 123 | vma->vm_page_prot = vm_get_page_prot(vma->vm_flags); |
1da177e4 LT |
124 | down_write(¤t->mm->mmap_sem); |
125 | if (insert_vm_struct(current->mm, vma)) { | |
126 | up_write(¤t->mm->mmap_sem); | |
127 | kmem_cache_free(vm_area_cachep, vma); | |
128 | return; | |
129 | } | |
130 | up_write(¤t->mm->mmap_sem); | |
131 | } | |
132 | ||
133 | /* map NaT-page at address zero to speed up speculative dereferencing of NULL: */ | |
134 | if (!(current->personality & MMAP_PAGE_ZERO)) { | |
c3762229 | 135 | vma = kmem_cache_zalloc(vm_area_cachep, GFP_KERNEL); |
1da177e4 | 136 | if (vma) { |
5beb4930 | 137 | INIT_LIST_HEAD(&vma->anon_vma_chain); |
1da177e4 LT |
138 | vma->vm_mm = current->mm; |
139 | vma->vm_end = PAGE_SIZE; | |
140 | vma->vm_page_prot = __pgprot(pgprot_val(PAGE_READONLY) | _PAGE_MA_NAT); | |
314e51b9 KK |
141 | vma->vm_flags = VM_READ | VM_MAYREAD | VM_IO | |
142 | VM_DONTEXPAND | VM_DONTDUMP; | |
1da177e4 LT |
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 | { | |
11199692 | 157 | free_reserved_area(ia64_imva(__init_begin), ia64_imva(__init_end), |
dbe67df4 | 158 | -1, "unused kernel"); |
1da177e4 LT |
159 | } |
160 | ||
dae28066 | 161 | void __init |
1da177e4 LT |
162 | free_initrd_mem (unsigned long start, unsigned long end) |
163 | { | |
1da177e4 LT |
164 | /* |
165 | * EFI uses 4KB pages while the kernel can use 4KB or bigger. | |
166 | * Thus EFI and the kernel may have different page sizes. It is | |
167 | * therefore possible to have the initrd share the same page as | |
168 | * the end of the kernel (given current setup). | |
169 | * | |
170 | * To avoid freeing/using the wrong page (kernel sized) we: | |
171 | * - align up the beginning of initrd | |
172 | * - align down the end of initrd | |
173 | * | |
174 | * | | | |
175 | * |=============| a000 | |
176 | * | | | |
177 | * | | | |
178 | * | | 9000 | |
179 | * |/////////////| | |
180 | * |/////////////| | |
181 | * |=============| 8000 | |
182 | * |///INITRD////| | |
183 | * |/////////////| | |
184 | * |/////////////| 7000 | |
185 | * | | | |
186 | * |KKKKKKKKKKKKK| | |
187 | * |=============| 6000 | |
188 | * |KKKKKKKKKKKKK| | |
189 | * |KKKKKKKKKKKKK| | |
190 | * K=kernel using 8KB pages | |
191 | * | |
192 | * In this example, we must free page 8000 ONLY. So we must align up | |
193 | * initrd_start and keep initrd_end as is. | |
194 | */ | |
195 | start = PAGE_ALIGN(start); | |
196 | end = end & PAGE_MASK; | |
197 | ||
198 | if (start < end) | |
199 | printk(KERN_INFO "Freeing initrd memory: %ldkB freed\n", (end - start) >> 10); | |
200 | ||
201 | for (; start < end; start += PAGE_SIZE) { | |
202 | if (!virt_addr_valid(start)) | |
203 | continue; | |
66f62594 | 204 | free_reserved_page(virt_to_page(start)); |
1da177e4 LT |
205 | } |
206 | } | |
207 | ||
208 | /* | |
209 | * This installs a clean page in the kernel's page table. | |
210 | */ | |
dae28066 | 211 | static struct page * __init |
1da177e4 LT |
212 | put_kernel_page (struct page *page, unsigned long address, pgprot_t pgprot) |
213 | { | |
214 | pgd_t *pgd; | |
215 | pud_t *pud; | |
216 | pmd_t *pmd; | |
217 | pte_t *pte; | |
218 | ||
219 | if (!PageReserved(page)) | |
220 | printk(KERN_ERR "put_kernel_page: page at 0x%p not in reserved memory\n", | |
221 | page_address(page)); | |
222 | ||
223 | pgd = pgd_offset_k(address); /* note: this is NOT pgd_offset()! */ | |
224 | ||
1da177e4 LT |
225 | { |
226 | pud = pud_alloc(&init_mm, pgd, address); | |
227 | if (!pud) | |
228 | goto out; | |
1da177e4 LT |
229 | pmd = pmd_alloc(&init_mm, pud, address); |
230 | if (!pmd) | |
231 | goto out; | |
872fec16 | 232 | pte = pte_alloc_kernel(pmd, address); |
1da177e4 LT |
233 | if (!pte) |
234 | goto out; | |
872fec16 | 235 | if (!pte_none(*pte)) |
1da177e4 | 236 | goto out; |
1da177e4 | 237 | set_pte(pte, mk_pte(page, pgprot)); |
1da177e4 | 238 | } |
872fec16 | 239 | out: |
1da177e4 LT |
240 | /* no need for flush_tlb */ |
241 | return page; | |
242 | } | |
243 | ||
914a4ea4 | 244 | static void __init |
1da177e4 LT |
245 | setup_gate (void) |
246 | { | |
e4ff5b8f | 247 | void *gate_section; |
1da177e4 LT |
248 | struct page *page; |
249 | ||
250 | /* | |
ad597bd5 DMT |
251 | * Map the gate page twice: once read-only to export the ELF |
252 | * headers etc. and once execute-only page to enable | |
253 | * privilege-promotion via "epc": | |
1da177e4 | 254 | */ |
e4ff5b8f IY |
255 | gate_section = paravirt_get_gate_section(); |
256 | page = virt_to_page(ia64_imva(gate_section)); | |
1da177e4 LT |
257 | put_kernel_page(page, GATE_ADDR, PAGE_READONLY); |
258 | #ifdef HAVE_BUGGY_SEGREL | |
e4ff5b8f | 259 | page = virt_to_page(ia64_imva(gate_section + PAGE_SIZE)); |
1da177e4 LT |
260 | put_kernel_page(page, GATE_ADDR + PAGE_SIZE, PAGE_GATE); |
261 | #else | |
262 | put_kernel_page(page, GATE_ADDR + PERCPU_PAGE_SIZE, PAGE_GATE); | |
ad597bd5 DMT |
263 | /* Fill in the holes (if any) with read-only zero pages: */ |
264 | { | |
265 | unsigned long addr; | |
266 | ||
267 | for (addr = GATE_ADDR + PAGE_SIZE; | |
268 | addr < GATE_ADDR + PERCPU_PAGE_SIZE; | |
269 | addr += PAGE_SIZE) | |
270 | { | |
271 | put_kernel_page(ZERO_PAGE(0), addr, | |
272 | PAGE_READONLY); | |
273 | put_kernel_page(ZERO_PAGE(0), addr + PERCPU_PAGE_SIZE, | |
274 | PAGE_READONLY); | |
275 | } | |
276 | } | |
1da177e4 LT |
277 | #endif |
278 | ia64_patch_gate(); | |
279 | } | |
280 | ||
5b5e76e9 | 281 | void ia64_mmu_init(void *my_cpu_data) |
1da177e4 | 282 | { |
00b65985 | 283 | unsigned long pta, impl_va_bits; |
5b5e76e9 | 284 | extern void tlb_init(void); |
1da177e4 LT |
285 | |
286 | #ifdef CONFIG_DISABLE_VHPT | |
287 | # define VHPT_ENABLE_BIT 0 | |
288 | #else | |
289 | # define VHPT_ENABLE_BIT 1 | |
290 | #endif | |
291 | ||
1da177e4 LT |
292 | /* |
293 | * Check if the virtually mapped linear page table (VMLPT) overlaps with a mapped | |
294 | * address space. The IA-64 architecture guarantees that at least 50 bits of | |
295 | * virtual address space are implemented but if we pick a large enough page size | |
296 | * (e.g., 64KB), the mapped address space is big enough that it will overlap with | |
297 | * VMLPT. I assume that once we run on machines big enough to warrant 64KB pages, | |
298 | * IMPL_VA_MSB will be significantly bigger, so this is unlikely to become a | |
299 | * problem in practice. Alternatively, we could truncate the top of the mapped | |
300 | * address space to not permit mappings that would overlap with the VMLPT. | |
301 | * --davidm 00/12/06 | |
302 | */ | |
303 | # define pte_bits 3 | |
304 | # define mapped_space_bits (3*(PAGE_SHIFT - pte_bits) + PAGE_SHIFT) | |
305 | /* | |
306 | * The virtual page table has to cover the entire implemented address space within | |
307 | * a region even though not all of this space may be mappable. The reason for | |
308 | * this is that the Access bit and Dirty bit fault handlers perform | |
309 | * non-speculative accesses to the virtual page table, so the address range of the | |
310 | * virtual page table itself needs to be covered by virtual page table. | |
311 | */ | |
312 | # define vmlpt_bits (impl_va_bits - PAGE_SHIFT + pte_bits) | |
313 | # define POW2(n) (1ULL << (n)) | |
314 | ||
315 | impl_va_bits = ffz(~(local_cpu_data->unimpl_va_mask | (7UL << 61))); | |
316 | ||
317 | if (impl_va_bits < 51 || impl_va_bits > 61) | |
318 | panic("CPU has bogus IMPL_VA_MSB value of %lu!\n", impl_va_bits - 1); | |
6cf07a8c PC |
319 | /* |
320 | * mapped_space_bits - PAGE_SHIFT is the total number of ptes we need, | |
321 | * which must fit into "vmlpt_bits - pte_bits" slots. Second half of | |
322 | * the test makes sure that our mapped space doesn't overlap the | |
323 | * unimplemented hole in the middle of the region. | |
324 | */ | |
325 | if ((mapped_space_bits - PAGE_SHIFT > vmlpt_bits - pte_bits) || | |
326 | (mapped_space_bits > impl_va_bits - 1)) | |
327 | panic("Cannot build a big enough virtual-linear page table" | |
328 | " to cover mapped address space.\n" | |
329 | " Try using a smaller page size.\n"); | |
330 | ||
1da177e4 LT |
331 | |
332 | /* place the VMLPT at the end of each page-table mapped region: */ | |
333 | pta = POW2(61) - POW2(vmlpt_bits); | |
334 | ||
1da177e4 LT |
335 | /* |
336 | * Set the (virtually mapped linear) page table address. Bit | |
337 | * 8 selects between the short and long format, bits 2-7 the | |
338 | * size of the table, and bit 0 whether the VHPT walker is | |
339 | * enabled. | |
340 | */ | |
341 | ia64_set_pta(pta | (0 << 8) | (vmlpt_bits << 2) | VHPT_ENABLE_BIT); | |
342 | ||
343 | ia64_tlb_init(); | |
344 | ||
345 | #ifdef CONFIG_HUGETLB_PAGE | |
346 | ia64_set_rr(HPAGE_REGION_BASE, HPAGE_SHIFT << 2); | |
347 | ia64_srlz_d(); | |
348 | #endif | |
349 | } | |
350 | ||
351 | #ifdef CONFIG_VIRTUAL_MEM_MAP | |
e44e41d0 BP |
352 | int vmemmap_find_next_valid_pfn(int node, int i) |
353 | { | |
354 | unsigned long end_address, hole_next_pfn; | |
355 | unsigned long stop_address; | |
356 | pg_data_t *pgdat = NODE_DATA(node); | |
357 | ||
358 | end_address = (unsigned long) &vmem_map[pgdat->node_start_pfn + i]; | |
359 | end_address = PAGE_ALIGN(end_address); | |
6408068e | 360 | stop_address = (unsigned long) &vmem_map[pgdat_end_pfn(pgdat)]; |
e44e41d0 BP |
361 | |
362 | do { | |
363 | pgd_t *pgd; | |
364 | pud_t *pud; | |
365 | pmd_t *pmd; | |
366 | pte_t *pte; | |
367 | ||
368 | pgd = pgd_offset_k(end_address); | |
369 | if (pgd_none(*pgd)) { | |
370 | end_address += PGDIR_SIZE; | |
371 | continue; | |
372 | } | |
373 | ||
374 | pud = pud_offset(pgd, end_address); | |
375 | if (pud_none(*pud)) { | |
376 | end_address += PUD_SIZE; | |
377 | continue; | |
378 | } | |
379 | ||
380 | pmd = pmd_offset(pud, end_address); | |
381 | if (pmd_none(*pmd)) { | |
382 | end_address += PMD_SIZE; | |
383 | continue; | |
384 | } | |
385 | ||
386 | pte = pte_offset_kernel(pmd, end_address); | |
387 | retry_pte: | |
388 | if (pte_none(*pte)) { | |
389 | end_address += PAGE_SIZE; | |
390 | pte++; | |
391 | if ((end_address < stop_address) && | |
392 | (end_address != ALIGN(end_address, 1UL << PMD_SHIFT))) | |
393 | goto retry_pte; | |
394 | continue; | |
395 | } | |
396 | /* Found next valid vmem_map page */ | |
397 | break; | |
398 | } while (end_address < stop_address); | |
399 | ||
400 | end_address = min(end_address, stop_address); | |
401 | end_address = end_address - (unsigned long) vmem_map + sizeof(struct page) - 1; | |
402 | hole_next_pfn = end_address / sizeof(struct page); | |
403 | return hole_next_pfn - pgdat->node_start_pfn; | |
404 | } | |
1da177e4 | 405 | |
e088a4ad | 406 | int __init create_mem_map_page_table(u64 start, u64 end, void *arg) |
1da177e4 LT |
407 | { |
408 | unsigned long address, start_page, end_page; | |
409 | struct page *map_start, *map_end; | |
410 | int node; | |
411 | pgd_t *pgd; | |
412 | pud_t *pud; | |
413 | pmd_t *pmd; | |
414 | pte_t *pte; | |
415 | ||
416 | map_start = vmem_map + (__pa(start) >> PAGE_SHIFT); | |
417 | map_end = vmem_map + (__pa(end) >> PAGE_SHIFT); | |
418 | ||
419 | start_page = (unsigned long) map_start & PAGE_MASK; | |
420 | end_page = PAGE_ALIGN((unsigned long) map_end); | |
421 | node = paddr_to_nid(__pa(start)); | |
422 | ||
423 | for (address = start_page; address < end_page; address += PAGE_SIZE) { | |
424 | pgd = pgd_offset_k(address); | |
425 | if (pgd_none(*pgd)) | |
426 | pgd_populate(&init_mm, pgd, alloc_bootmem_pages_node(NODE_DATA(node), PAGE_SIZE)); | |
427 | pud = pud_offset(pgd, address); | |
428 | ||
429 | if (pud_none(*pud)) | |
430 | pud_populate(&init_mm, pud, alloc_bootmem_pages_node(NODE_DATA(node), PAGE_SIZE)); | |
431 | pmd = pmd_offset(pud, address); | |
432 | ||
433 | if (pmd_none(*pmd)) | |
434 | pmd_populate_kernel(&init_mm, pmd, alloc_bootmem_pages_node(NODE_DATA(node), PAGE_SIZE)); | |
435 | pte = pte_offset_kernel(pmd, address); | |
436 | ||
437 | if (pte_none(*pte)) | |
438 | set_pte(pte, pfn_pte(__pa(alloc_bootmem_pages_node(NODE_DATA(node), PAGE_SIZE)) >> PAGE_SHIFT, | |
439 | PAGE_KERNEL)); | |
440 | } | |
441 | return 0; | |
442 | } | |
443 | ||
444 | struct memmap_init_callback_data { | |
445 | struct page *start; | |
446 | struct page *end; | |
447 | int nid; | |
448 | unsigned long zone; | |
449 | }; | |
450 | ||
18b8befd | 451 | static int __meminit |
e088a4ad | 452 | virtual_memmap_init(u64 start, u64 end, void *arg) |
1da177e4 LT |
453 | { |
454 | struct memmap_init_callback_data *args; | |
455 | struct page *map_start, *map_end; | |
456 | ||
457 | args = (struct memmap_init_callback_data *) arg; | |
458 | map_start = vmem_map + (__pa(start) >> PAGE_SHIFT); | |
459 | map_end = vmem_map + (__pa(end) >> PAGE_SHIFT); | |
460 | ||
461 | if (map_start < args->start) | |
462 | map_start = args->start; | |
463 | if (map_end > args->end) | |
464 | map_end = args->end; | |
465 | ||
466 | /* | |
467 | * We have to initialize "out of bounds" struct page elements that fit completely | |
468 | * on the same pages that were allocated for the "in bounds" elements because they | |
469 | * may be referenced later (and found to be "reserved"). | |
470 | */ | |
471 | map_start -= ((unsigned long) map_start & (PAGE_SIZE - 1)) / sizeof(struct page); | |
472 | map_end += ((PAGE_ALIGN((unsigned long) map_end) - (unsigned long) map_end) | |
473 | / sizeof(struct page)); | |
474 | ||
475 | if (map_start < map_end) | |
476 | memmap_init_zone((unsigned long)(map_end - map_start), | |
a2f3aa02 DH |
477 | args->nid, args->zone, page_to_pfn(map_start), |
478 | MEMMAP_EARLY); | |
1da177e4 LT |
479 | return 0; |
480 | } | |
481 | ||
18b8befd | 482 | void __meminit |
1da177e4 LT |
483 | memmap_init (unsigned long size, int nid, unsigned long zone, |
484 | unsigned long start_pfn) | |
485 | { | |
486 | if (!vmem_map) | |
a2f3aa02 | 487 | memmap_init_zone(size, nid, zone, start_pfn, MEMMAP_EARLY); |
1da177e4 LT |
488 | else { |
489 | struct page *start; | |
490 | struct memmap_init_callback_data args; | |
491 | ||
492 | start = pfn_to_page(start_pfn); | |
493 | args.start = start; | |
494 | args.end = start + size; | |
495 | args.nid = nid; | |
496 | args.zone = zone; | |
497 | ||
498 | efi_memmap_walk(virtual_memmap_init, &args); | |
499 | } | |
500 | } | |
501 | ||
502 | int | |
503 | ia64_pfn_valid (unsigned long pfn) | |
504 | { | |
505 | char byte; | |
506 | struct page *pg = pfn_to_page(pfn); | |
507 | ||
508 | return (__get_user(byte, (char __user *) pg) == 0) | |
509 | && ((((u64)pg & PAGE_MASK) == (((u64)(pg + 1) - 1) & PAGE_MASK)) | |
510 | || (__get_user(byte, (char __user *) (pg + 1) - 1) == 0)); | |
511 | } | |
512 | EXPORT_SYMBOL(ia64_pfn_valid); | |
513 | ||
e088a4ad | 514 | int __init find_largest_hole(u64 start, u64 end, void *arg) |
1da177e4 LT |
515 | { |
516 | u64 *max_gap = arg; | |
517 | ||
518 | static u64 last_end = PAGE_OFFSET; | |
519 | ||
520 | /* NOTE: this algorithm assumes efi memmap table is ordered */ | |
521 | ||
522 | if (*max_gap < (start - last_end)) | |
523 | *max_gap = start - last_end; | |
524 | last_end = end; | |
525 | return 0; | |
526 | } | |
05e0caad | 527 | |
139b8304 BP |
528 | #endif /* CONFIG_VIRTUAL_MEM_MAP */ |
529 | ||
e088a4ad | 530 | int __init register_active_ranges(u64 start, u64 len, int nid) |
05e0caad | 531 | { |
98075d24 | 532 | u64 end = start + len; |
139b8304 | 533 | |
139b8304 BP |
534 | #ifdef CONFIG_KEXEC |
535 | if (start > crashk_res.start && start < crashk_res.end) | |
536 | start = crashk_res.end; | |
537 | if (end > crashk_res.start && end < crashk_res.end) | |
538 | end = crashk_res.start; | |
539 | #endif | |
540 | ||
541 | if (start < end) | |
98e4ae8a | 542 | memblock_add_node(__pa(start), end - start, nid); |
05e0caad MG |
543 | return 0; |
544 | } | |
1da177e4 | 545 | |
a3f5c338 | 546 | int |
e088a4ad | 547 | find_max_min_low_pfn (u64 start, u64 end, void *arg) |
a3f5c338 ZN |
548 | { |
549 | unsigned long pfn_start, pfn_end; | |
550 | #ifdef CONFIG_FLATMEM | |
551 | pfn_start = (PAGE_ALIGN(__pa(start))) >> PAGE_SHIFT; | |
552 | pfn_end = (PAGE_ALIGN(__pa(end - 1))) >> PAGE_SHIFT; | |
553 | #else | |
554 | pfn_start = GRANULEROUNDDOWN(__pa(start)) >> PAGE_SHIFT; | |
555 | pfn_end = GRANULEROUNDUP(__pa(end - 1)) >> PAGE_SHIFT; | |
556 | #endif | |
557 | min_low_pfn = min(min_low_pfn, pfn_start); | |
558 | max_low_pfn = max(max_low_pfn, pfn_end); | |
559 | return 0; | |
560 | } | |
561 | ||
1da177e4 LT |
562 | /* |
563 | * Boot command-line option "nolwsys" can be used to disable the use of any light-weight | |
564 | * system call handler. When this option is in effect, all fsyscalls will end up bubbling | |
565 | * down into the kernel and calling the normal (heavy-weight) syscall handler. This is | |
566 | * useful for performance testing, but conceivably could also come in handy for debugging | |
567 | * purposes. | |
568 | */ | |
569 | ||
03906ea0 | 570 | static int nolwsys __initdata; |
1da177e4 LT |
571 | |
572 | static int __init | |
573 | nolwsys_setup (char *s) | |
574 | { | |
575 | nolwsys = 1; | |
576 | return 1; | |
577 | } | |
578 | ||
579 | __setup("nolwsys", nolwsys_setup); | |
580 | ||
dae28066 | 581 | void __init |
1da177e4 LT |
582 | mem_init (void) |
583 | { | |
1da177e4 | 584 | int i; |
1da177e4 | 585 | |
fde740e4 RH |
586 | BUG_ON(PTRS_PER_PGD * sizeof(pgd_t) != PAGE_SIZE); |
587 | BUG_ON(PTRS_PER_PMD * sizeof(pmd_t) != PAGE_SIZE); | |
588 | BUG_ON(PTRS_PER_PTE * sizeof(pte_t) != PAGE_SIZE); | |
589 | ||
1da177e4 LT |
590 | #ifdef CONFIG_PCI |
591 | /* | |
592 | * This needs to be called _after_ the command line has been parsed but _before_ | |
593 | * any drivers that may need the PCI DMA interface are initialized or bootmem has | |
594 | * been freed. | |
595 | */ | |
596 | platform_dma_init(); | |
597 | #endif | |
598 | ||
2d4b1fa2 | 599 | #ifdef CONFIG_FLATMEM |
80a03e29 | 600 | BUG_ON(!mem_map); |
1da177e4 LT |
601 | #endif |
602 | ||
b57b63a2 | 603 | set_max_mapnr(max_low_pfn); |
1da177e4 | 604 | high_memory = __va(max_low_pfn * PAGE_SIZE); |
b57b63a2 | 605 | free_all_bootmem(); |
de4bcddc | 606 | mem_init_print_info(NULL); |
1da177e4 LT |
607 | |
608 | /* | |
609 | * For fsyscall entrpoints with no light-weight handler, use the ordinary | |
610 | * (heavy-weight) handler, but mark it by setting bit 0, so the fsyscall entry | |
611 | * code can tell them apart. | |
612 | */ | |
613 | for (i = 0; i < NR_syscalls; ++i) { | |
1da177e4 | 614 | extern unsigned long sys_call_table[NR_syscalls]; |
dd97d5cb | 615 | unsigned long *fsyscall_table = paravirt_get_fsyscall_table(); |
1da177e4 LT |
616 | |
617 | if (!fsyscall_table[i] || nolwsys) | |
618 | fsyscall_table[i] = sys_call_table[i] | 1; | |
619 | } | |
620 | setup_gate(); | |
1da177e4 | 621 | } |
1681b8e1 YG |
622 | |
623 | #ifdef CONFIG_MEMORY_HOTPLUG | |
bc02af93 | 624 | int arch_add_memory(int nid, u64 start, u64 size) |
1681b8e1 YG |
625 | { |
626 | pg_data_t *pgdat; | |
627 | struct zone *zone; | |
628 | unsigned long start_pfn = start >> PAGE_SHIFT; | |
629 | unsigned long nr_pages = size >> PAGE_SHIFT; | |
630 | int ret; | |
631 | ||
bc02af93 | 632 | pgdat = NODE_DATA(nid); |
1681b8e1 | 633 | |
ed562ae6 WN |
634 | zone = pgdat->node_zones + |
635 | zone_for_memory(nid, start, size, ZONE_NORMAL); | |
c04fc586 | 636 | ret = __add_pages(nid, zone, start_pfn, nr_pages); |
1681b8e1 YG |
637 | |
638 | if (ret) | |
639 | printk("%s: Problem encountered in __add_pages() as ret=%d\n", | |
d4ed8084 | 640 | __func__, ret); |
1681b8e1 YG |
641 | |
642 | return ret; | |
643 | } | |
24d335ca WC |
644 | |
645 | #ifdef CONFIG_MEMORY_HOTREMOVE | |
646 | int arch_remove_memory(u64 start, u64 size) | |
647 | { | |
648 | unsigned long start_pfn = start >> PAGE_SHIFT; | |
649 | unsigned long nr_pages = size >> PAGE_SHIFT; | |
650 | struct zone *zone; | |
651 | int ret; | |
652 | ||
653 | zone = page_zone(pfn_to_page(start_pfn)); | |
654 | ret = __remove_pages(zone, start_pfn, nr_pages); | |
655 | if (ret) | |
656 | pr_warn("%s: Problem encountered in __remove_pages() as" | |
657 | " ret=%d\n", __func__, ret); | |
658 | ||
659 | return ret; | |
660 | } | |
661 | #endif | |
1681b8e1 | 662 | #endif |
839052d2 HX |
663 | |
664 | /* | |
665 | * Even when CONFIG_IA32_SUPPORT is not enabled it is | |
666 | * useful to have the Linux/x86 domain registered to | |
667 | * avoid an attempted module load when emulators call | |
668 | * personality(PER_LINUX32). This saves several milliseconds | |
669 | * on each such call. | |
670 | */ | |
671 | static struct exec_domain ia32_exec_domain; | |
672 | ||
673 | static int __init | |
674 | per_linux32_init(void) | |
675 | { | |
676 | ia32_exec_domain.name = "Linux/x86"; | |
677 | ia32_exec_domain.handler = NULL; | |
678 | ia32_exec_domain.pers_low = PER_LINUX32; | |
679 | ia32_exec_domain.pers_high = PER_LINUX32; | |
680 | ia32_exec_domain.signal_map = default_exec_domain.signal_map; | |
681 | ia32_exec_domain.signal_invmap = default_exec_domain.signal_invmap; | |
682 | register_exec_domain(&ia32_exec_domain); | |
683 | ||
684 | return 0; | |
685 | } | |
686 | ||
687 | __initcall(per_linux32_init); | |
aec6a888 MG |
688 | |
689 | /** | |
690 | * show_mem - give short summary of memory stats | |
691 | * | |
692 | * Shows a simple page count of reserved and used pages in the system. | |
693 | * For discontig machines, it does this on a per-pgdat basis. | |
694 | */ | |
695 | void show_mem(unsigned int filter) | |
696 | { | |
697 | int total_reserved = 0; | |
698 | unsigned long total_present = 0; | |
699 | pg_data_t *pgdat; | |
700 | ||
701 | printk(KERN_INFO "Mem-info:\n"); | |
702 | show_free_areas(filter); | |
703 | printk(KERN_INFO "Node memory in pages:\n"); | |
704 | for_each_online_pgdat(pgdat) { | |
705 | unsigned long present; | |
706 | unsigned long flags; | |
707 | int reserved = 0; | |
708 | int nid = pgdat->node_id; | |
709 | int zoneid; | |
710 | ||
711 | if (skip_free_areas_node(filter, nid)) | |
712 | continue; | |
713 | pgdat_resize_lock(pgdat, &flags); | |
714 | ||
715 | for (zoneid = 0; zoneid < MAX_NR_ZONES; zoneid++) { | |
716 | struct zone *zone = &pgdat->node_zones[zoneid]; | |
717 | if (!populated_zone(zone)) | |
718 | continue; | |
719 | ||
720 | reserved += zone->present_pages - zone->managed_pages; | |
721 | } | |
722 | present = pgdat->node_present_pages; | |
723 | ||
724 | pgdat_resize_unlock(pgdat, &flags); | |
725 | total_present += present; | |
726 | total_reserved += reserved; | |
727 | printk(KERN_INFO "Node %4d: RAM: %11ld, rsvd: %8d, ", | |
728 | nid, present, reserved); | |
729 | } | |
730 | printk(KERN_INFO "%ld pages of RAM\n", total_present); | |
731 | printk(KERN_INFO "%d reserved pages\n", total_reserved); | |
732 | printk(KERN_INFO "Total of %ld pages in page table cache\n", | |
733 | quicklist_total_size()); | |
734 | printk(KERN_INFO "%ld free buffer pages\n", nr_free_buffer_pages()); | |
735 | } |