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> | |
22 | ||
23 | #include <asm/a.out.h> | |
24 | #include <asm/dma.h> | |
25 | #include <asm/ia32.h> | |
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> | |
33 | #include <asm/system.h> | |
34 | #include <asm/tlb.h> | |
35 | #include <asm/uaccess.h> | |
36 | #include <asm/unistd.h> | |
37 | #include <asm/mca.h> | |
38 | ||
39 | DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); | |
40 | ||
fde740e4 RH |
41 | DEFINE_PER_CPU(unsigned long *, __pgtable_quicklist); |
42 | DEFINE_PER_CPU(long, __pgtable_quicklist_size); | |
43 | ||
1da177e4 LT |
44 | extern void ia64_tlb_init (void); |
45 | ||
46 | unsigned long MAX_DMA_ADDRESS = PAGE_OFFSET + 0x100000000UL; | |
47 | ||
48 | #ifdef CONFIG_VIRTUAL_MEM_MAP | |
49 | unsigned long vmalloc_end = VMALLOC_END_INIT; | |
50 | EXPORT_SYMBOL(vmalloc_end); | |
51 | struct page *vmem_map; | |
52 | EXPORT_SYMBOL(vmem_map); | |
53 | #endif | |
54 | ||
fde740e4 | 55 | struct page *zero_page_memmap_ptr; /* map entry for zero page */ |
1da177e4 LT |
56 | EXPORT_SYMBOL(zero_page_memmap_ptr); |
57 | ||
fde740e4 | 58 | #define MIN_PGT_PAGES 25UL |
e96c9b47 | 59 | #define MAX_PGT_FREES_PER_PASS 16L |
fde740e4 RH |
60 | #define PGT_FRACTION_OF_NODE_MEM 16 |
61 | ||
62 | static inline long | |
63 | max_pgt_pages(void) | |
64 | { | |
65 | u64 node_free_pages, max_pgt_pages; | |
66 | ||
67 | #ifndef CONFIG_NUMA | |
68 | node_free_pages = nr_free_pages(); | |
69 | #else | |
70 | node_free_pages = nr_free_pages_pgdat(NODE_DATA(numa_node_id())); | |
71 | #endif | |
72 | max_pgt_pages = node_free_pages / PGT_FRACTION_OF_NODE_MEM; | |
73 | max_pgt_pages = max(max_pgt_pages, MIN_PGT_PAGES); | |
74 | return max_pgt_pages; | |
75 | } | |
76 | ||
77 | static inline long | |
78 | min_pages_to_free(void) | |
79 | { | |
80 | long pages_to_free; | |
81 | ||
82 | pages_to_free = pgtable_quicklist_size - max_pgt_pages(); | |
83 | pages_to_free = min(pages_to_free, MAX_PGT_FREES_PER_PASS); | |
84 | return pages_to_free; | |
85 | } | |
86 | ||
1da177e4 | 87 | void |
fde740e4 | 88 | check_pgt_cache(void) |
1da177e4 | 89 | { |
fde740e4 | 90 | long pages_to_free; |
1da177e4 | 91 | |
fde740e4 RH |
92 | if (unlikely(pgtable_quicklist_size <= MIN_PGT_PAGES)) |
93 | return; | |
1da177e4 LT |
94 | |
95 | preempt_disable(); | |
fde740e4 RH |
96 | while (unlikely((pages_to_free = min_pages_to_free()) > 0)) { |
97 | while (pages_to_free--) { | |
98 | free_page((unsigned long)pgtable_quicklist_alloc()); | |
99 | } | |
100 | preempt_enable(); | |
101 | preempt_disable(); | |
1da177e4 LT |
102 | } |
103 | preempt_enable(); | |
104 | } | |
105 | ||
106 | void | |
107 | lazy_mmu_prot_update (pte_t pte) | |
108 | { | |
109 | unsigned long addr; | |
110 | struct page *page; | |
5e48521e | 111 | unsigned long order; |
1da177e4 LT |
112 | |
113 | if (!pte_exec(pte)) | |
114 | return; /* not an executable page... */ | |
115 | ||
116 | page = pte_page(pte); | |
117 | addr = (unsigned long) page_address(page); | |
118 | ||
119 | if (test_bit(PG_arch_1, &page->flags)) | |
120 | return; /* i-cache is already coherent with d-cache */ | |
121 | ||
5e48521e ZY |
122 | if (PageCompound(page)) { |
123 | order = (unsigned long) (page[1].lru.prev); | |
124 | flush_icache_range(addr, addr + (1UL << order << PAGE_SHIFT)); | |
125 | } | |
126 | else | |
127 | flush_icache_range(addr, addr + PAGE_SIZE); | |
1da177e4 LT |
128 | set_bit(PG_arch_1, &page->flags); /* mark page as clean */ |
129 | } | |
130 | ||
131 | inline void | |
132 | ia64_set_rbs_bot (void) | |
133 | { | |
134 | unsigned long stack_size = current->signal->rlim[RLIMIT_STACK].rlim_max & -16; | |
135 | ||
136 | if (stack_size > MAX_USER_STACK_SIZE) | |
137 | stack_size = MAX_USER_STACK_SIZE; | |
138 | current->thread.rbs_bot = STACK_TOP - stack_size; | |
139 | } | |
140 | ||
141 | /* | |
142 | * This performs some platform-dependent address space initialization. | |
143 | * On IA-64, we want to setup the VM area for the register backing | |
144 | * store (which grows upwards) and install the gateway page which is | |
145 | * used for signal trampolines, etc. | |
146 | */ | |
147 | void | |
148 | ia64_init_addr_space (void) | |
149 | { | |
150 | struct vm_area_struct *vma; | |
151 | ||
152 | ia64_set_rbs_bot(); | |
153 | ||
154 | /* | |
155 | * If we're out of memory and kmem_cache_alloc() returns NULL, we simply ignore | |
156 | * the problem. When the process attempts to write to the register backing store | |
157 | * for the first time, it will get a SEGFAULT in this case. | |
158 | */ | |
e94b1766 | 159 | vma = kmem_cache_alloc(vm_area_cachep, GFP_KERNEL); |
1da177e4 LT |
160 | if (vma) { |
161 | memset(vma, 0, sizeof(*vma)); | |
162 | vma->vm_mm = current->mm; | |
163 | vma->vm_start = current->thread.rbs_bot & PAGE_MASK; | |
164 | vma->vm_end = vma->vm_start + PAGE_SIZE; | |
165 | vma->vm_page_prot = protection_map[VM_DATA_DEFAULT_FLAGS & 0x7]; | |
46dea3d0 | 166 | vma->vm_flags = VM_DATA_DEFAULT_FLAGS|VM_GROWSUP|VM_ACCOUNT; |
1da177e4 LT |
167 | down_write(¤t->mm->mmap_sem); |
168 | if (insert_vm_struct(current->mm, vma)) { | |
169 | up_write(¤t->mm->mmap_sem); | |
170 | kmem_cache_free(vm_area_cachep, vma); | |
171 | return; | |
172 | } | |
173 | up_write(¤t->mm->mmap_sem); | |
174 | } | |
175 | ||
176 | /* map NaT-page at address zero to speed up speculative dereferencing of NULL: */ | |
177 | if (!(current->personality & MMAP_PAGE_ZERO)) { | |
e94b1766 | 178 | vma = kmem_cache_alloc(vm_area_cachep, GFP_KERNEL); |
1da177e4 LT |
179 | if (vma) { |
180 | memset(vma, 0, sizeof(*vma)); | |
181 | vma->vm_mm = current->mm; | |
182 | vma->vm_end = PAGE_SIZE; | |
183 | vma->vm_page_prot = __pgprot(pgprot_val(PAGE_READONLY) | _PAGE_MA_NAT); | |
184 | vma->vm_flags = VM_READ | VM_MAYREAD | VM_IO | VM_RESERVED; | |
185 | down_write(¤t->mm->mmap_sem); | |
186 | if (insert_vm_struct(current->mm, vma)) { | |
187 | up_write(¤t->mm->mmap_sem); | |
188 | kmem_cache_free(vm_area_cachep, vma); | |
189 | return; | |
190 | } | |
191 | up_write(¤t->mm->mmap_sem); | |
192 | } | |
193 | } | |
194 | } | |
195 | ||
196 | void | |
197 | free_initmem (void) | |
198 | { | |
199 | unsigned long addr, eaddr; | |
200 | ||
201 | addr = (unsigned long) ia64_imva(__init_begin); | |
202 | eaddr = (unsigned long) ia64_imva(__init_end); | |
203 | while (addr < eaddr) { | |
204 | ClearPageReserved(virt_to_page(addr)); | |
7835e98b | 205 | init_page_count(virt_to_page(addr)); |
1da177e4 LT |
206 | free_page(addr); |
207 | ++totalram_pages; | |
208 | addr += PAGE_SIZE; | |
209 | } | |
210 | printk(KERN_INFO "Freeing unused kernel memory: %ldkB freed\n", | |
211 | (__init_end - __init_begin) >> 10); | |
212 | } | |
213 | ||
dae28066 | 214 | void __init |
1da177e4 LT |
215 | free_initrd_mem (unsigned long start, unsigned long end) |
216 | { | |
217 | struct page *page; | |
218 | /* | |
219 | * EFI uses 4KB pages while the kernel can use 4KB or bigger. | |
220 | * Thus EFI and the kernel may have different page sizes. It is | |
221 | * therefore possible to have the initrd share the same page as | |
222 | * the end of the kernel (given current setup). | |
223 | * | |
224 | * To avoid freeing/using the wrong page (kernel sized) we: | |
225 | * - align up the beginning of initrd | |
226 | * - align down the end of initrd | |
227 | * | |
228 | * | | | |
229 | * |=============| a000 | |
230 | * | | | |
231 | * | | | |
232 | * | | 9000 | |
233 | * |/////////////| | |
234 | * |/////////////| | |
235 | * |=============| 8000 | |
236 | * |///INITRD////| | |
237 | * |/////////////| | |
238 | * |/////////////| 7000 | |
239 | * | | | |
240 | * |KKKKKKKKKKKKK| | |
241 | * |=============| 6000 | |
242 | * |KKKKKKKKKKKKK| | |
243 | * |KKKKKKKKKKKKK| | |
244 | * K=kernel using 8KB pages | |
245 | * | |
246 | * In this example, we must free page 8000 ONLY. So we must align up | |
247 | * initrd_start and keep initrd_end as is. | |
248 | */ | |
249 | start = PAGE_ALIGN(start); | |
250 | end = end & PAGE_MASK; | |
251 | ||
252 | if (start < end) | |
253 | printk(KERN_INFO "Freeing initrd memory: %ldkB freed\n", (end - start) >> 10); | |
254 | ||
255 | for (; start < end; start += PAGE_SIZE) { | |
256 | if (!virt_addr_valid(start)) | |
257 | continue; | |
258 | page = virt_to_page(start); | |
259 | ClearPageReserved(page); | |
7835e98b | 260 | init_page_count(page); |
1da177e4 LT |
261 | free_page(start); |
262 | ++totalram_pages; | |
263 | } | |
264 | } | |
265 | ||
266 | /* | |
267 | * This installs a clean page in the kernel's page table. | |
268 | */ | |
dae28066 | 269 | static struct page * __init |
1da177e4 LT |
270 | put_kernel_page (struct page *page, unsigned long address, pgprot_t pgprot) |
271 | { | |
272 | pgd_t *pgd; | |
273 | pud_t *pud; | |
274 | pmd_t *pmd; | |
275 | pte_t *pte; | |
276 | ||
277 | if (!PageReserved(page)) | |
278 | printk(KERN_ERR "put_kernel_page: page at 0x%p not in reserved memory\n", | |
279 | page_address(page)); | |
280 | ||
281 | pgd = pgd_offset_k(address); /* note: this is NOT pgd_offset()! */ | |
282 | ||
1da177e4 LT |
283 | { |
284 | pud = pud_alloc(&init_mm, pgd, address); | |
285 | if (!pud) | |
286 | goto out; | |
1da177e4 LT |
287 | pmd = pmd_alloc(&init_mm, pud, address); |
288 | if (!pmd) | |
289 | goto out; | |
872fec16 | 290 | pte = pte_alloc_kernel(pmd, address); |
1da177e4 LT |
291 | if (!pte) |
292 | goto out; | |
872fec16 | 293 | if (!pte_none(*pte)) |
1da177e4 | 294 | goto out; |
1da177e4 | 295 | set_pte(pte, mk_pte(page, pgprot)); |
1da177e4 | 296 | } |
872fec16 | 297 | out: |
1da177e4 LT |
298 | /* no need for flush_tlb */ |
299 | return page; | |
300 | } | |
301 | ||
914a4ea4 | 302 | static void __init |
1da177e4 LT |
303 | setup_gate (void) |
304 | { | |
305 | struct page *page; | |
306 | ||
307 | /* | |
ad597bd5 DMT |
308 | * Map the gate page twice: once read-only to export the ELF |
309 | * headers etc. and once execute-only page to enable | |
310 | * privilege-promotion via "epc": | |
1da177e4 LT |
311 | */ |
312 | page = virt_to_page(ia64_imva(__start_gate_section)); | |
313 | put_kernel_page(page, GATE_ADDR, PAGE_READONLY); | |
314 | #ifdef HAVE_BUGGY_SEGREL | |
315 | page = virt_to_page(ia64_imva(__start_gate_section + PAGE_SIZE)); | |
316 | put_kernel_page(page, GATE_ADDR + PAGE_SIZE, PAGE_GATE); | |
317 | #else | |
318 | put_kernel_page(page, GATE_ADDR + PERCPU_PAGE_SIZE, PAGE_GATE); | |
ad597bd5 DMT |
319 | /* Fill in the holes (if any) with read-only zero pages: */ |
320 | { | |
321 | unsigned long addr; | |
322 | ||
323 | for (addr = GATE_ADDR + PAGE_SIZE; | |
324 | addr < GATE_ADDR + PERCPU_PAGE_SIZE; | |
325 | addr += PAGE_SIZE) | |
326 | { | |
327 | put_kernel_page(ZERO_PAGE(0), addr, | |
328 | PAGE_READONLY); | |
329 | put_kernel_page(ZERO_PAGE(0), addr + PERCPU_PAGE_SIZE, | |
330 | PAGE_READONLY); | |
331 | } | |
332 | } | |
1da177e4 LT |
333 | #endif |
334 | ia64_patch_gate(); | |
335 | } | |
336 | ||
337 | void __devinit | |
338 | ia64_mmu_init (void *my_cpu_data) | |
339 | { | |
340 | unsigned long psr, pta, impl_va_bits; | |
341 | extern void __devinit tlb_init (void); | |
342 | ||
343 | #ifdef CONFIG_DISABLE_VHPT | |
344 | # define VHPT_ENABLE_BIT 0 | |
345 | #else | |
346 | # define VHPT_ENABLE_BIT 1 | |
347 | #endif | |
348 | ||
349 | /* Pin mapping for percpu area into TLB */ | |
350 | psr = ia64_clear_ic(); | |
351 | ia64_itr(0x2, IA64_TR_PERCPU_DATA, PERCPU_ADDR, | |
352 | pte_val(pfn_pte(__pa(my_cpu_data) >> PAGE_SHIFT, PAGE_KERNEL)), | |
353 | PERCPU_PAGE_SHIFT); | |
354 | ||
355 | ia64_set_psr(psr); | |
356 | ia64_srlz_i(); | |
357 | ||
358 | /* | |
359 | * Check if the virtually mapped linear page table (VMLPT) overlaps with a mapped | |
360 | * address space. The IA-64 architecture guarantees that at least 50 bits of | |
361 | * virtual address space are implemented but if we pick a large enough page size | |
362 | * (e.g., 64KB), the mapped address space is big enough that it will overlap with | |
363 | * VMLPT. I assume that once we run on machines big enough to warrant 64KB pages, | |
364 | * IMPL_VA_MSB will be significantly bigger, so this is unlikely to become a | |
365 | * problem in practice. Alternatively, we could truncate the top of the mapped | |
366 | * address space to not permit mappings that would overlap with the VMLPT. | |
367 | * --davidm 00/12/06 | |
368 | */ | |
369 | # define pte_bits 3 | |
370 | # define mapped_space_bits (3*(PAGE_SHIFT - pte_bits) + PAGE_SHIFT) | |
371 | /* | |
372 | * The virtual page table has to cover the entire implemented address space within | |
373 | * a region even though not all of this space may be mappable. The reason for | |
374 | * this is that the Access bit and Dirty bit fault handlers perform | |
375 | * non-speculative accesses to the virtual page table, so the address range of the | |
376 | * virtual page table itself needs to be covered by virtual page table. | |
377 | */ | |
378 | # define vmlpt_bits (impl_va_bits - PAGE_SHIFT + pte_bits) | |
379 | # define POW2(n) (1ULL << (n)) | |
380 | ||
381 | impl_va_bits = ffz(~(local_cpu_data->unimpl_va_mask | (7UL << 61))); | |
382 | ||
383 | if (impl_va_bits < 51 || impl_va_bits > 61) | |
384 | panic("CPU has bogus IMPL_VA_MSB value of %lu!\n", impl_va_bits - 1); | |
6cf07a8c PC |
385 | /* |
386 | * mapped_space_bits - PAGE_SHIFT is the total number of ptes we need, | |
387 | * which must fit into "vmlpt_bits - pte_bits" slots. Second half of | |
388 | * the test makes sure that our mapped space doesn't overlap the | |
389 | * unimplemented hole in the middle of the region. | |
390 | */ | |
391 | if ((mapped_space_bits - PAGE_SHIFT > vmlpt_bits - pte_bits) || | |
392 | (mapped_space_bits > impl_va_bits - 1)) | |
393 | panic("Cannot build a big enough virtual-linear page table" | |
394 | " to cover mapped address space.\n" | |
395 | " Try using a smaller page size.\n"); | |
396 | ||
1da177e4 LT |
397 | |
398 | /* place the VMLPT at the end of each page-table mapped region: */ | |
399 | pta = POW2(61) - POW2(vmlpt_bits); | |
400 | ||
1da177e4 LT |
401 | /* |
402 | * Set the (virtually mapped linear) page table address. Bit | |
403 | * 8 selects between the short and long format, bits 2-7 the | |
404 | * size of the table, and bit 0 whether the VHPT walker is | |
405 | * enabled. | |
406 | */ | |
407 | ia64_set_pta(pta | (0 << 8) | (vmlpt_bits << 2) | VHPT_ENABLE_BIT); | |
408 | ||
409 | ia64_tlb_init(); | |
410 | ||
411 | #ifdef CONFIG_HUGETLB_PAGE | |
412 | ia64_set_rr(HPAGE_REGION_BASE, HPAGE_SHIFT << 2); | |
413 | ia64_srlz_d(); | |
414 | #endif | |
415 | } | |
416 | ||
417 | #ifdef CONFIG_VIRTUAL_MEM_MAP | |
e44e41d0 BP |
418 | int vmemmap_find_next_valid_pfn(int node, int i) |
419 | { | |
420 | unsigned long end_address, hole_next_pfn; | |
421 | unsigned long stop_address; | |
422 | pg_data_t *pgdat = NODE_DATA(node); | |
423 | ||
424 | end_address = (unsigned long) &vmem_map[pgdat->node_start_pfn + i]; | |
425 | end_address = PAGE_ALIGN(end_address); | |
426 | ||
427 | stop_address = (unsigned long) &vmem_map[ | |
428 | pgdat->node_start_pfn + pgdat->node_spanned_pages]; | |
429 | ||
430 | do { | |
431 | pgd_t *pgd; | |
432 | pud_t *pud; | |
433 | pmd_t *pmd; | |
434 | pte_t *pte; | |
435 | ||
436 | pgd = pgd_offset_k(end_address); | |
437 | if (pgd_none(*pgd)) { | |
438 | end_address += PGDIR_SIZE; | |
439 | continue; | |
440 | } | |
441 | ||
442 | pud = pud_offset(pgd, end_address); | |
443 | if (pud_none(*pud)) { | |
444 | end_address += PUD_SIZE; | |
445 | continue; | |
446 | } | |
447 | ||
448 | pmd = pmd_offset(pud, end_address); | |
449 | if (pmd_none(*pmd)) { | |
450 | end_address += PMD_SIZE; | |
451 | continue; | |
452 | } | |
453 | ||
454 | pte = pte_offset_kernel(pmd, end_address); | |
455 | retry_pte: | |
456 | if (pte_none(*pte)) { | |
457 | end_address += PAGE_SIZE; | |
458 | pte++; | |
459 | if ((end_address < stop_address) && | |
460 | (end_address != ALIGN(end_address, 1UL << PMD_SHIFT))) | |
461 | goto retry_pte; | |
462 | continue; | |
463 | } | |
464 | /* Found next valid vmem_map page */ | |
465 | break; | |
466 | } while (end_address < stop_address); | |
467 | ||
468 | end_address = min(end_address, stop_address); | |
469 | end_address = end_address - (unsigned long) vmem_map + sizeof(struct page) - 1; | |
470 | hole_next_pfn = end_address / sizeof(struct page); | |
471 | return hole_next_pfn - pgdat->node_start_pfn; | |
472 | } | |
1da177e4 | 473 | |
dae28066 | 474 | int __init |
1da177e4 LT |
475 | create_mem_map_page_table (u64 start, u64 end, void *arg) |
476 | { | |
477 | unsigned long address, start_page, end_page; | |
478 | struct page *map_start, *map_end; | |
479 | int node; | |
480 | pgd_t *pgd; | |
481 | pud_t *pud; | |
482 | pmd_t *pmd; | |
483 | pte_t *pte; | |
484 | ||
485 | map_start = vmem_map + (__pa(start) >> PAGE_SHIFT); | |
486 | map_end = vmem_map + (__pa(end) >> PAGE_SHIFT); | |
487 | ||
488 | start_page = (unsigned long) map_start & PAGE_MASK; | |
489 | end_page = PAGE_ALIGN((unsigned long) map_end); | |
490 | node = paddr_to_nid(__pa(start)); | |
491 | ||
492 | for (address = start_page; address < end_page; address += PAGE_SIZE) { | |
493 | pgd = pgd_offset_k(address); | |
494 | if (pgd_none(*pgd)) | |
495 | pgd_populate(&init_mm, pgd, alloc_bootmem_pages_node(NODE_DATA(node), PAGE_SIZE)); | |
496 | pud = pud_offset(pgd, address); | |
497 | ||
498 | if (pud_none(*pud)) | |
499 | pud_populate(&init_mm, pud, alloc_bootmem_pages_node(NODE_DATA(node), PAGE_SIZE)); | |
500 | pmd = pmd_offset(pud, address); | |
501 | ||
502 | if (pmd_none(*pmd)) | |
503 | pmd_populate_kernel(&init_mm, pmd, alloc_bootmem_pages_node(NODE_DATA(node), PAGE_SIZE)); | |
504 | pte = pte_offset_kernel(pmd, address); | |
505 | ||
506 | if (pte_none(*pte)) | |
507 | set_pte(pte, pfn_pte(__pa(alloc_bootmem_pages_node(NODE_DATA(node), PAGE_SIZE)) >> PAGE_SHIFT, | |
508 | PAGE_KERNEL)); | |
509 | } | |
510 | return 0; | |
511 | } | |
512 | ||
513 | struct memmap_init_callback_data { | |
514 | struct page *start; | |
515 | struct page *end; | |
516 | int nid; | |
517 | unsigned long zone; | |
518 | }; | |
519 | ||
520 | static int | |
521 | virtual_memmap_init (u64 start, u64 end, void *arg) | |
522 | { | |
523 | struct memmap_init_callback_data *args; | |
524 | struct page *map_start, *map_end; | |
525 | ||
526 | args = (struct memmap_init_callback_data *) arg; | |
527 | map_start = vmem_map + (__pa(start) >> PAGE_SHIFT); | |
528 | map_end = vmem_map + (__pa(end) >> PAGE_SHIFT); | |
529 | ||
530 | if (map_start < args->start) | |
531 | map_start = args->start; | |
532 | if (map_end > args->end) | |
533 | map_end = args->end; | |
534 | ||
535 | /* | |
536 | * We have to initialize "out of bounds" struct page elements that fit completely | |
537 | * on the same pages that were allocated for the "in bounds" elements because they | |
538 | * may be referenced later (and found to be "reserved"). | |
539 | */ | |
540 | map_start -= ((unsigned long) map_start & (PAGE_SIZE - 1)) / sizeof(struct page); | |
541 | map_end += ((PAGE_ALIGN((unsigned long) map_end) - (unsigned long) map_end) | |
542 | / sizeof(struct page)); | |
543 | ||
544 | if (map_start < map_end) | |
545 | memmap_init_zone((unsigned long)(map_end - map_start), | |
546 | args->nid, args->zone, page_to_pfn(map_start)); | |
547 | return 0; | |
548 | } | |
549 | ||
550 | void | |
551 | memmap_init (unsigned long size, int nid, unsigned long zone, | |
552 | unsigned long start_pfn) | |
553 | { | |
554 | if (!vmem_map) | |
555 | memmap_init_zone(size, nid, zone, start_pfn); | |
556 | else { | |
557 | struct page *start; | |
558 | struct memmap_init_callback_data args; | |
559 | ||
560 | start = pfn_to_page(start_pfn); | |
561 | args.start = start; | |
562 | args.end = start + size; | |
563 | args.nid = nid; | |
564 | args.zone = zone; | |
565 | ||
566 | efi_memmap_walk(virtual_memmap_init, &args); | |
567 | } | |
568 | } | |
569 | ||
570 | int | |
571 | ia64_pfn_valid (unsigned long pfn) | |
572 | { | |
573 | char byte; | |
574 | struct page *pg = pfn_to_page(pfn); | |
575 | ||
576 | return (__get_user(byte, (char __user *) pg) == 0) | |
577 | && ((((u64)pg & PAGE_MASK) == (((u64)(pg + 1) - 1) & PAGE_MASK)) | |
578 | || (__get_user(byte, (char __user *) (pg + 1) - 1) == 0)); | |
579 | } | |
580 | EXPORT_SYMBOL(ia64_pfn_valid); | |
581 | ||
dae28066 | 582 | int __init |
1da177e4 LT |
583 | find_largest_hole (u64 start, u64 end, void *arg) |
584 | { | |
585 | u64 *max_gap = arg; | |
586 | ||
587 | static u64 last_end = PAGE_OFFSET; | |
588 | ||
589 | /* NOTE: this algorithm assumes efi memmap table is ordered */ | |
590 | ||
591 | if (*max_gap < (start - last_end)) | |
592 | *max_gap = start - last_end; | |
593 | last_end = end; | |
594 | return 0; | |
595 | } | |
05e0caad MG |
596 | |
597 | int __init | |
598 | register_active_ranges(u64 start, u64 end, void *nid) | |
599 | { | |
600 | BUG_ON(nid == NULL); | |
601 | BUG_ON(*(unsigned long *)nid >= MAX_NUMNODES); | |
602 | ||
603 | add_active_range(*(unsigned long *)nid, | |
604 | __pa(start) >> PAGE_SHIFT, | |
605 | __pa(end) >> PAGE_SHIFT); | |
606 | return 0; | |
607 | } | |
1da177e4 LT |
608 | #endif /* CONFIG_VIRTUAL_MEM_MAP */ |
609 | ||
dae28066 | 610 | static int __init |
1da177e4 LT |
611 | count_reserved_pages (u64 start, u64 end, void *arg) |
612 | { | |
613 | unsigned long num_reserved = 0; | |
614 | unsigned long *count = arg; | |
615 | ||
616 | for (; start < end; start += PAGE_SIZE) | |
617 | if (PageReserved(virt_to_page(start))) | |
618 | ++num_reserved; | |
619 | *count += num_reserved; | |
620 | return 0; | |
621 | } | |
622 | ||
623 | /* | |
624 | * Boot command-line option "nolwsys" can be used to disable the use of any light-weight | |
625 | * system call handler. When this option is in effect, all fsyscalls will end up bubbling | |
626 | * down into the kernel and calling the normal (heavy-weight) syscall handler. This is | |
627 | * useful for performance testing, but conceivably could also come in handy for debugging | |
628 | * purposes. | |
629 | */ | |
630 | ||
03906ea0 | 631 | static int nolwsys __initdata; |
1da177e4 LT |
632 | |
633 | static int __init | |
634 | nolwsys_setup (char *s) | |
635 | { | |
636 | nolwsys = 1; | |
637 | return 1; | |
638 | } | |
639 | ||
640 | __setup("nolwsys", nolwsys_setup); | |
641 | ||
dae28066 | 642 | void __init |
1da177e4 LT |
643 | mem_init (void) |
644 | { | |
645 | long reserved_pages, codesize, datasize, initsize; | |
1da177e4 LT |
646 | pg_data_t *pgdat; |
647 | int i; | |
648 | static struct kcore_list kcore_mem, kcore_vmem, kcore_kernel; | |
649 | ||
fde740e4 RH |
650 | BUG_ON(PTRS_PER_PGD * sizeof(pgd_t) != PAGE_SIZE); |
651 | BUG_ON(PTRS_PER_PMD * sizeof(pmd_t) != PAGE_SIZE); | |
652 | BUG_ON(PTRS_PER_PTE * sizeof(pte_t) != PAGE_SIZE); | |
653 | ||
1da177e4 LT |
654 | #ifdef CONFIG_PCI |
655 | /* | |
656 | * This needs to be called _after_ the command line has been parsed but _before_ | |
657 | * any drivers that may need the PCI DMA interface are initialized or bootmem has | |
658 | * been freed. | |
659 | */ | |
660 | platform_dma_init(); | |
661 | #endif | |
662 | ||
2d4b1fa2 | 663 | #ifdef CONFIG_FLATMEM |
1da177e4 LT |
664 | if (!mem_map) |
665 | BUG(); | |
666 | max_mapnr = max_low_pfn; | |
667 | #endif | |
668 | ||
669 | high_memory = __va(max_low_pfn * PAGE_SIZE); | |
670 | ||
671 | kclist_add(&kcore_mem, __va(0), max_low_pfn * PAGE_SIZE); | |
672 | kclist_add(&kcore_vmem, (void *)VMALLOC_START, VMALLOC_END-VMALLOC_START); | |
673 | kclist_add(&kcore_kernel, _stext, _end - _stext); | |
674 | ||
ec936fc5 | 675 | for_each_online_pgdat(pgdat) |
564601a5 | 676 | if (pgdat->bdata->node_bootmem_map) |
677 | totalram_pages += free_all_bootmem_node(pgdat); | |
1da177e4 LT |
678 | |
679 | reserved_pages = 0; | |
680 | efi_memmap_walk(count_reserved_pages, &reserved_pages); | |
681 | ||
682 | codesize = (unsigned long) _etext - (unsigned long) _stext; | |
683 | datasize = (unsigned long) _edata - (unsigned long) _etext; | |
684 | initsize = (unsigned long) __init_end - (unsigned long) __init_begin; | |
685 | ||
686 | printk(KERN_INFO "Memory: %luk/%luk available (%luk code, %luk reserved, " | |
687 | "%luk data, %luk init)\n", (unsigned long) nr_free_pages() << (PAGE_SHIFT - 10), | |
688 | num_physpages << (PAGE_SHIFT - 10), codesize >> 10, | |
689 | reserved_pages << (PAGE_SHIFT - 10), datasize >> 10, initsize >> 10); | |
690 | ||
1da177e4 LT |
691 | |
692 | /* | |
693 | * For fsyscall entrpoints with no light-weight handler, use the ordinary | |
694 | * (heavy-weight) handler, but mark it by setting bit 0, so the fsyscall entry | |
695 | * code can tell them apart. | |
696 | */ | |
697 | for (i = 0; i < NR_syscalls; ++i) { | |
698 | extern unsigned long fsyscall_table[NR_syscalls]; | |
699 | extern unsigned long sys_call_table[NR_syscalls]; | |
700 | ||
701 | if (!fsyscall_table[i] || nolwsys) | |
702 | fsyscall_table[i] = sys_call_table[i] | 1; | |
703 | } | |
704 | setup_gate(); | |
705 | ||
706 | #ifdef CONFIG_IA32_SUPPORT | |
707 | ia32_mem_init(); | |
708 | #endif | |
709 | } | |
1681b8e1 YG |
710 | |
711 | #ifdef CONFIG_MEMORY_HOTPLUG | |
712 | void online_page(struct page *page) | |
713 | { | |
714 | ClearPageReserved(page); | |
7835e98b | 715 | init_page_count(page); |
1681b8e1 YG |
716 | __free_page(page); |
717 | totalram_pages++; | |
718 | num_physpages++; | |
719 | } | |
720 | ||
bc02af93 | 721 | int arch_add_memory(int nid, u64 start, u64 size) |
1681b8e1 YG |
722 | { |
723 | pg_data_t *pgdat; | |
724 | struct zone *zone; | |
725 | unsigned long start_pfn = start >> PAGE_SHIFT; | |
726 | unsigned long nr_pages = size >> PAGE_SHIFT; | |
727 | int ret; | |
728 | ||
bc02af93 | 729 | pgdat = NODE_DATA(nid); |
1681b8e1 YG |
730 | |
731 | zone = pgdat->node_zones + ZONE_NORMAL; | |
732 | ret = __add_pages(zone, start_pfn, nr_pages); | |
733 | ||
734 | if (ret) | |
735 | printk("%s: Problem encountered in __add_pages() as ret=%d\n", | |
736 | __FUNCTION__, ret); | |
737 | ||
738 | return ret; | |
739 | } | |
740 | ||
741 | int remove_memory(u64 start, u64 size) | |
742 | { | |
743 | return -EINVAL; | |
744 | } | |
9c576ff1 | 745 | EXPORT_SYMBOL_GPL(remove_memory); |
1681b8e1 | 746 | #endif |