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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* |
3 | * Initialize MMU support. | |
4 | * | |
5 | * Copyright (C) 1998-2003 Hewlett-Packard Co | |
6 | * David Mosberger-Tang <davidm@hpl.hp.com> | |
7 | */ | |
1da177e4 LT |
8 | #include <linux/kernel.h> |
9 | #include <linux/init.h> | |
10 | ||
11 | #include <linux/bootmem.h> | |
12 | #include <linux/efi.h> | |
13 | #include <linux/elf.h> | |
98e4ae8a | 14 | #include <linux/memblock.h> |
1da177e4 | 15 | #include <linux/mm.h> |
3f07c014 | 16 | #include <linux/sched/signal.h> |
1da177e4 LT |
17 | #include <linux/mmzone.h> |
18 | #include <linux/module.h> | |
19 | #include <linux/personality.h> | |
20 | #include <linux/reboot.h> | |
21 | #include <linux/slab.h> | |
22 | #include <linux/swap.h> | |
23 | #include <linux/proc_fs.h> | |
24 | #include <linux/bitops.h> | |
139b8304 | 25 | #include <linux/kexec.h> |
1da177e4 | 26 | |
1da177e4 | 27 | #include <asm/dma.h> |
1da177e4 LT |
28 | #include <asm/io.h> |
29 | #include <asm/machvec.h> | |
30 | #include <asm/numa.h> | |
31 | #include <asm/patch.h> | |
32 | #include <asm/pgalloc.h> | |
33 | #include <asm/sal.h> | |
34 | #include <asm/sections.h> | |
1da177e4 | 35 | #include <asm/tlb.h> |
7c0f6ba6 | 36 | #include <linux/uaccess.h> |
1da177e4 LT |
37 | #include <asm/unistd.h> |
38 | #include <asm/mca.h> | |
39 | ||
1da177e4 LT |
40 | extern void ia64_tlb_init (void); |
41 | ||
42 | unsigned long MAX_DMA_ADDRESS = PAGE_OFFSET + 0x100000000UL; | |
43 | ||
44 | #ifdef CONFIG_VIRTUAL_MEM_MAP | |
126b3fcd TH |
45 | unsigned long VMALLOC_END = VMALLOC_END_INIT; |
46 | EXPORT_SYMBOL(VMALLOC_END); | |
1da177e4 LT |
47 | struct page *vmem_map; |
48 | EXPORT_SYMBOL(vmem_map); | |
49 | #endif | |
50 | ||
fde740e4 | 51 | struct page *zero_page_memmap_ptr; /* map entry for zero page */ |
1da177e4 LT |
52 | EXPORT_SYMBOL(zero_page_memmap_ptr); |
53 | ||
1da177e4 | 54 | void |
954ffcb3 | 55 | __ia64_sync_icache_dcache (pte_t pte) |
1da177e4 LT |
56 | { |
57 | unsigned long addr; | |
58 | struct page *page; | |
59 | ||
1da177e4 LT |
60 | page = pte_page(pte); |
61 | addr = (unsigned long) page_address(page); | |
62 | ||
63 | if (test_bit(PG_arch_1, &page->flags)) | |
64 | return; /* i-cache is already coherent with d-cache */ | |
65 | ||
273988fa | 66 | flush_icache_range(addr, addr + (PAGE_SIZE << compound_order(page))); |
1da177e4 LT |
67 | set_bit(PG_arch_1, &page->flags); /* mark page as clean */ |
68 | } | |
69 | ||
cde14bbf JB |
70 | /* |
71 | * Since DMA is i-cache coherent, any (complete) pages that were written via | |
72 | * DMA can be marked as "clean" so that lazy_mmu_prot_update() doesn't have to | |
73 | * flush them when they get mapped into an executable vm-area. | |
74 | */ | |
75 | void | |
76 | dma_mark_clean(void *addr, size_t size) | |
77 | { | |
78 | unsigned long pg_addr, end; | |
79 | ||
80 | pg_addr = PAGE_ALIGN((unsigned long) addr); | |
81 | end = (unsigned long) addr + size; | |
82 | while (pg_addr + PAGE_SIZE <= end) { | |
83 | struct page *page = virt_to_page(pg_addr); | |
84 | set_bit(PG_arch_1, &page->flags); | |
85 | pg_addr += PAGE_SIZE; | |
86 | } | |
87 | } | |
88 | ||
1da177e4 LT |
89 | inline void |
90 | ia64_set_rbs_bot (void) | |
91 | { | |
02b763b8 | 92 | unsigned long stack_size = rlimit_max(RLIMIT_STACK) & -16; |
1da177e4 LT |
93 | |
94 | if (stack_size > MAX_USER_STACK_SIZE) | |
95 | stack_size = MAX_USER_STACK_SIZE; | |
83d2cd3d | 96 | current->thread.rbs_bot = PAGE_ALIGN(current->mm->start_stack - stack_size); |
1da177e4 LT |
97 | } |
98 | ||
99 | /* | |
100 | * This performs some platform-dependent address space initialization. | |
101 | * On IA-64, we want to setup the VM area for the register backing | |
102 | * store (which grows upwards) and install the gateway page which is | |
103 | * used for signal trampolines, etc. | |
104 | */ | |
105 | void | |
106 | ia64_init_addr_space (void) | |
107 | { | |
108 | struct vm_area_struct *vma; | |
109 | ||
110 | ia64_set_rbs_bot(); | |
111 | ||
112 | /* | |
113 | * If we're out of memory and kmem_cache_alloc() returns NULL, we simply ignore | |
114 | * the problem. When the process attempts to write to the register backing store | |
115 | * for the first time, it will get a SEGFAULT in this case. | |
116 | */ | |
e88c5cf9 | 117 | vma = vm_area_alloc(); |
1da177e4 | 118 | if (vma) { |
5beb4930 | 119 | INIT_LIST_HEAD(&vma->anon_vma_chain); |
1da177e4 LT |
120 | vma->vm_mm = current->mm; |
121 | vma->vm_start = current->thread.rbs_bot & PAGE_MASK; | |
122 | vma->vm_end = vma->vm_start + PAGE_SIZE; | |
46dea3d0 | 123 | vma->vm_flags = VM_DATA_DEFAULT_FLAGS|VM_GROWSUP|VM_ACCOUNT; |
3ed75eb8 | 124 | vma->vm_page_prot = vm_get_page_prot(vma->vm_flags); |
1da177e4 LT |
125 | down_write(¤t->mm->mmap_sem); |
126 | if (insert_vm_struct(current->mm, vma)) { | |
127 | up_write(¤t->mm->mmap_sem); | |
e88c5cf9 | 128 | vm_area_free(vma); |
1da177e4 LT |
129 | return; |
130 | } | |
131 | up_write(¤t->mm->mmap_sem); | |
132 | } | |
133 | ||
134 | /* map NaT-page at address zero to speed up speculative dereferencing of NULL: */ | |
135 | if (!(current->personality & MMAP_PAGE_ZERO)) { | |
e88c5cf9 | 136 | vma = vm_area_alloc(); |
1da177e4 | 137 | if (vma) { |
5beb4930 | 138 | INIT_LIST_HEAD(&vma->anon_vma_chain); |
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); | |
314e51b9 KK |
142 | vma->vm_flags = VM_READ | VM_MAYREAD | VM_IO | |
143 | VM_DONTEXPAND | VM_DONTDUMP; | |
1da177e4 LT |
144 | down_write(¤t->mm->mmap_sem); |
145 | if (insert_vm_struct(current->mm, vma)) { | |
146 | up_write(¤t->mm->mmap_sem); | |
e88c5cf9 | 147 | vm_area_free(vma); |
1da177e4 LT |
148 | return; |
149 | } | |
150 | up_write(¤t->mm->mmap_sem); | |
151 | } | |
152 | } | |
153 | } | |
154 | ||
155 | void | |
156 | free_initmem (void) | |
157 | { | |
11199692 | 158 | free_reserved_area(ia64_imva(__init_begin), ia64_imva(__init_end), |
dbe67df4 | 159 | -1, "unused kernel"); |
1da177e4 LT |
160 | } |
161 | ||
dae28066 | 162 | void __init |
1da177e4 LT |
163 | free_initrd_mem (unsigned long start, unsigned long end) |
164 | { | |
1da177e4 LT |
165 | /* |
166 | * EFI uses 4KB pages while the kernel can use 4KB or bigger. | |
167 | * Thus EFI and the kernel may have different page sizes. It is | |
168 | * therefore possible to have the initrd share the same page as | |
169 | * the end of the kernel (given current setup). | |
170 | * | |
171 | * To avoid freeing/using the wrong page (kernel sized) we: | |
172 | * - align up the beginning of initrd | |
173 | * - align down the end of initrd | |
174 | * | |
175 | * | | | |
176 | * |=============| a000 | |
177 | * | | | |
178 | * | | | |
179 | * | | 9000 | |
180 | * |/////////////| | |
181 | * |/////////////| | |
182 | * |=============| 8000 | |
183 | * |///INITRD////| | |
184 | * |/////////////| | |
185 | * |/////////////| 7000 | |
186 | * | | | |
187 | * |KKKKKKKKKKKKK| | |
188 | * |=============| 6000 | |
189 | * |KKKKKKKKKKKKK| | |
190 | * |KKKKKKKKKKKKK| | |
191 | * K=kernel using 8KB pages | |
192 | * | |
193 | * In this example, we must free page 8000 ONLY. So we must align up | |
194 | * initrd_start and keep initrd_end as is. | |
195 | */ | |
196 | start = PAGE_ALIGN(start); | |
197 | end = end & PAGE_MASK; | |
198 | ||
199 | if (start < end) | |
200 | printk(KERN_INFO "Freeing initrd memory: %ldkB freed\n", (end - start) >> 10); | |
201 | ||
202 | for (; start < end; start += PAGE_SIZE) { | |
203 | if (!virt_addr_valid(start)) | |
204 | continue; | |
66f62594 | 205 | free_reserved_page(virt_to_page(start)); |
1da177e4 LT |
206 | } |
207 | } | |
208 | ||
209 | /* | |
210 | * This installs a clean page in the kernel's page table. | |
211 | */ | |
dae28066 | 212 | static struct page * __init |
1da177e4 LT |
213 | put_kernel_page (struct page *page, unsigned long address, pgprot_t pgprot) |
214 | { | |
215 | pgd_t *pgd; | |
216 | pud_t *pud; | |
217 | pmd_t *pmd; | |
218 | pte_t *pte; | |
219 | ||
1da177e4 LT |
220 | pgd = pgd_offset_k(address); /* note: this is NOT pgd_offset()! */ |
221 | ||
1da177e4 LT |
222 | { |
223 | pud = pud_alloc(&init_mm, pgd, address); | |
224 | if (!pud) | |
225 | goto out; | |
1da177e4 LT |
226 | pmd = pmd_alloc(&init_mm, pud, address); |
227 | if (!pmd) | |
228 | goto out; | |
872fec16 | 229 | pte = pte_alloc_kernel(pmd, address); |
1da177e4 LT |
230 | if (!pte) |
231 | goto out; | |
872fec16 | 232 | if (!pte_none(*pte)) |
1da177e4 | 233 | goto out; |
1da177e4 | 234 | set_pte(pte, mk_pte(page, pgprot)); |
1da177e4 | 235 | } |
872fec16 | 236 | out: |
1da177e4 LT |
237 | /* no need for flush_tlb */ |
238 | return page; | |
239 | } | |
240 | ||
914a4ea4 | 241 | static void __init |
1da177e4 LT |
242 | setup_gate (void) |
243 | { | |
244 | struct page *page; | |
245 | ||
246 | /* | |
ad597bd5 DMT |
247 | * Map the gate page twice: once read-only to export the ELF |
248 | * headers etc. and once execute-only page to enable | |
249 | * privilege-promotion via "epc": | |
1da177e4 | 250 | */ |
e55645ec | 251 | page = virt_to_page(ia64_imva(__start_gate_section)); |
1da177e4 LT |
252 | put_kernel_page(page, GATE_ADDR, PAGE_READONLY); |
253 | #ifdef HAVE_BUGGY_SEGREL | |
e55645ec | 254 | page = virt_to_page(ia64_imva(__start_gate_section + PAGE_SIZE)); |
1da177e4 LT |
255 | put_kernel_page(page, GATE_ADDR + PAGE_SIZE, PAGE_GATE); |
256 | #else | |
257 | put_kernel_page(page, GATE_ADDR + PERCPU_PAGE_SIZE, PAGE_GATE); | |
ad597bd5 DMT |
258 | /* Fill in the holes (if any) with read-only zero pages: */ |
259 | { | |
260 | unsigned long addr; | |
261 | ||
262 | for (addr = GATE_ADDR + PAGE_SIZE; | |
263 | addr < GATE_ADDR + PERCPU_PAGE_SIZE; | |
264 | addr += PAGE_SIZE) | |
265 | { | |
266 | put_kernel_page(ZERO_PAGE(0), addr, | |
267 | PAGE_READONLY); | |
268 | put_kernel_page(ZERO_PAGE(0), addr + PERCPU_PAGE_SIZE, | |
269 | PAGE_READONLY); | |
270 | } | |
271 | } | |
1da177e4 LT |
272 | #endif |
273 | ia64_patch_gate(); | |
274 | } | |
275 | ||
a6c19dfe AL |
276 | static struct vm_area_struct gate_vma; |
277 | ||
278 | static int __init gate_vma_init(void) | |
279 | { | |
280 | gate_vma.vm_mm = NULL; | |
281 | gate_vma.vm_start = FIXADDR_USER_START; | |
282 | gate_vma.vm_end = FIXADDR_USER_END; | |
283 | gate_vma.vm_flags = VM_READ | VM_MAYREAD | VM_EXEC | VM_MAYEXEC; | |
284 | gate_vma.vm_page_prot = __P101; | |
285 | ||
286 | return 0; | |
287 | } | |
288 | __initcall(gate_vma_init); | |
289 | ||
290 | struct vm_area_struct *get_gate_vma(struct mm_struct *mm) | |
291 | { | |
292 | return &gate_vma; | |
293 | } | |
294 | ||
295 | int in_gate_area_no_mm(unsigned long addr) | |
296 | { | |
297 | if ((addr >= FIXADDR_USER_START) && (addr < FIXADDR_USER_END)) | |
298 | return 1; | |
299 | return 0; | |
300 | } | |
301 | ||
302 | int in_gate_area(struct mm_struct *mm, unsigned long addr) | |
303 | { | |
304 | return in_gate_area_no_mm(addr); | |
305 | } | |
306 | ||
5b5e76e9 | 307 | void ia64_mmu_init(void *my_cpu_data) |
1da177e4 | 308 | { |
00b65985 | 309 | unsigned long pta, impl_va_bits; |
5b5e76e9 | 310 | extern void tlb_init(void); |
1da177e4 LT |
311 | |
312 | #ifdef CONFIG_DISABLE_VHPT | |
313 | # define VHPT_ENABLE_BIT 0 | |
314 | #else | |
315 | # define VHPT_ENABLE_BIT 1 | |
316 | #endif | |
317 | ||
1da177e4 LT |
318 | /* |
319 | * Check if the virtually mapped linear page table (VMLPT) overlaps with a mapped | |
320 | * address space. The IA-64 architecture guarantees that at least 50 bits of | |
321 | * virtual address space are implemented but if we pick a large enough page size | |
322 | * (e.g., 64KB), the mapped address space is big enough that it will overlap with | |
323 | * VMLPT. I assume that once we run on machines big enough to warrant 64KB pages, | |
324 | * IMPL_VA_MSB will be significantly bigger, so this is unlikely to become a | |
325 | * problem in practice. Alternatively, we could truncate the top of the mapped | |
326 | * address space to not permit mappings that would overlap with the VMLPT. | |
327 | * --davidm 00/12/06 | |
328 | */ | |
329 | # define pte_bits 3 | |
330 | # define mapped_space_bits (3*(PAGE_SHIFT - pte_bits) + PAGE_SHIFT) | |
331 | /* | |
332 | * The virtual page table has to cover the entire implemented address space within | |
333 | * a region even though not all of this space may be mappable. The reason for | |
334 | * this is that the Access bit and Dirty bit fault handlers perform | |
335 | * non-speculative accesses to the virtual page table, so the address range of the | |
336 | * virtual page table itself needs to be covered by virtual page table. | |
337 | */ | |
338 | # define vmlpt_bits (impl_va_bits - PAGE_SHIFT + pte_bits) | |
339 | # define POW2(n) (1ULL << (n)) | |
340 | ||
341 | impl_va_bits = ffz(~(local_cpu_data->unimpl_va_mask | (7UL << 61))); | |
342 | ||
343 | if (impl_va_bits < 51 || impl_va_bits > 61) | |
344 | panic("CPU has bogus IMPL_VA_MSB value of %lu!\n", impl_va_bits - 1); | |
6cf07a8c PC |
345 | /* |
346 | * mapped_space_bits - PAGE_SHIFT is the total number of ptes we need, | |
347 | * which must fit into "vmlpt_bits - pte_bits" slots. Second half of | |
348 | * the test makes sure that our mapped space doesn't overlap the | |
349 | * unimplemented hole in the middle of the region. | |
350 | */ | |
351 | if ((mapped_space_bits - PAGE_SHIFT > vmlpt_bits - pte_bits) || | |
352 | (mapped_space_bits > impl_va_bits - 1)) | |
353 | panic("Cannot build a big enough virtual-linear page table" | |
354 | " to cover mapped address space.\n" | |
355 | " Try using a smaller page size.\n"); | |
356 | ||
1da177e4 LT |
357 | |
358 | /* place the VMLPT at the end of each page-table mapped region: */ | |
359 | pta = POW2(61) - POW2(vmlpt_bits); | |
360 | ||
1da177e4 LT |
361 | /* |
362 | * Set the (virtually mapped linear) page table address. Bit | |
363 | * 8 selects between the short and long format, bits 2-7 the | |
364 | * size of the table, and bit 0 whether the VHPT walker is | |
365 | * enabled. | |
366 | */ | |
367 | ia64_set_pta(pta | (0 << 8) | (vmlpt_bits << 2) | VHPT_ENABLE_BIT); | |
368 | ||
369 | ia64_tlb_init(); | |
370 | ||
371 | #ifdef CONFIG_HUGETLB_PAGE | |
372 | ia64_set_rr(HPAGE_REGION_BASE, HPAGE_SHIFT << 2); | |
373 | ia64_srlz_d(); | |
374 | #endif | |
375 | } | |
376 | ||
377 | #ifdef CONFIG_VIRTUAL_MEM_MAP | |
e44e41d0 BP |
378 | int vmemmap_find_next_valid_pfn(int node, int i) |
379 | { | |
380 | unsigned long end_address, hole_next_pfn; | |
381 | unsigned long stop_address; | |
382 | pg_data_t *pgdat = NODE_DATA(node); | |
383 | ||
384 | end_address = (unsigned long) &vmem_map[pgdat->node_start_pfn + i]; | |
385 | end_address = PAGE_ALIGN(end_address); | |
6408068e | 386 | stop_address = (unsigned long) &vmem_map[pgdat_end_pfn(pgdat)]; |
e44e41d0 BP |
387 | |
388 | do { | |
389 | pgd_t *pgd; | |
390 | pud_t *pud; | |
391 | pmd_t *pmd; | |
392 | pte_t *pte; | |
393 | ||
394 | pgd = pgd_offset_k(end_address); | |
395 | if (pgd_none(*pgd)) { | |
396 | end_address += PGDIR_SIZE; | |
397 | continue; | |
398 | } | |
399 | ||
400 | pud = pud_offset(pgd, end_address); | |
401 | if (pud_none(*pud)) { | |
402 | end_address += PUD_SIZE; | |
403 | continue; | |
404 | } | |
405 | ||
406 | pmd = pmd_offset(pud, end_address); | |
407 | if (pmd_none(*pmd)) { | |
408 | end_address += PMD_SIZE; | |
409 | continue; | |
410 | } | |
411 | ||
412 | pte = pte_offset_kernel(pmd, end_address); | |
413 | retry_pte: | |
414 | if (pte_none(*pte)) { | |
415 | end_address += PAGE_SIZE; | |
416 | pte++; | |
417 | if ((end_address < stop_address) && | |
418 | (end_address != ALIGN(end_address, 1UL << PMD_SHIFT))) | |
419 | goto retry_pte; | |
420 | continue; | |
421 | } | |
422 | /* Found next valid vmem_map page */ | |
423 | break; | |
424 | } while (end_address < stop_address); | |
425 | ||
426 | end_address = min(end_address, stop_address); | |
427 | end_address = end_address - (unsigned long) vmem_map + sizeof(struct page) - 1; | |
428 | hole_next_pfn = end_address / sizeof(struct page); | |
429 | return hole_next_pfn - pgdat->node_start_pfn; | |
430 | } | |
1da177e4 | 431 | |
e088a4ad | 432 | int __init create_mem_map_page_table(u64 start, u64 end, void *arg) |
1da177e4 LT |
433 | { |
434 | unsigned long address, start_page, end_page; | |
435 | struct page *map_start, *map_end; | |
436 | int node; | |
437 | pgd_t *pgd; | |
438 | pud_t *pud; | |
439 | pmd_t *pmd; | |
440 | pte_t *pte; | |
441 | ||
442 | map_start = vmem_map + (__pa(start) >> PAGE_SHIFT); | |
443 | map_end = vmem_map + (__pa(end) >> PAGE_SHIFT); | |
444 | ||
445 | start_page = (unsigned long) map_start & PAGE_MASK; | |
446 | end_page = PAGE_ALIGN((unsigned long) map_end); | |
447 | node = paddr_to_nid(__pa(start)); | |
448 | ||
449 | for (address = start_page; address < end_page; address += PAGE_SIZE) { | |
450 | pgd = pgd_offset_k(address); | |
451 | if (pgd_none(*pgd)) | |
452 | pgd_populate(&init_mm, pgd, alloc_bootmem_pages_node(NODE_DATA(node), PAGE_SIZE)); | |
453 | pud = pud_offset(pgd, address); | |
454 | ||
455 | if (pud_none(*pud)) | |
456 | pud_populate(&init_mm, pud, alloc_bootmem_pages_node(NODE_DATA(node), PAGE_SIZE)); | |
457 | pmd = pmd_offset(pud, address); | |
458 | ||
459 | if (pmd_none(*pmd)) | |
460 | pmd_populate_kernel(&init_mm, pmd, alloc_bootmem_pages_node(NODE_DATA(node), PAGE_SIZE)); | |
461 | pte = pte_offset_kernel(pmd, address); | |
462 | ||
463 | if (pte_none(*pte)) | |
464 | set_pte(pte, pfn_pte(__pa(alloc_bootmem_pages_node(NODE_DATA(node), PAGE_SIZE)) >> PAGE_SHIFT, | |
465 | PAGE_KERNEL)); | |
466 | } | |
467 | return 0; | |
468 | } | |
469 | ||
470 | struct memmap_init_callback_data { | |
471 | struct page *start; | |
472 | struct page *end; | |
473 | int nid; | |
474 | unsigned long zone; | |
475 | }; | |
476 | ||
18b8befd | 477 | static int __meminit |
e088a4ad | 478 | virtual_memmap_init(u64 start, u64 end, void *arg) |
1da177e4 LT |
479 | { |
480 | struct memmap_init_callback_data *args; | |
481 | struct page *map_start, *map_end; | |
482 | ||
483 | args = (struct memmap_init_callback_data *) arg; | |
484 | map_start = vmem_map + (__pa(start) >> PAGE_SHIFT); | |
485 | map_end = vmem_map + (__pa(end) >> PAGE_SHIFT); | |
486 | ||
487 | if (map_start < args->start) | |
488 | map_start = args->start; | |
489 | if (map_end > args->end) | |
490 | map_end = args->end; | |
491 | ||
492 | /* | |
493 | * We have to initialize "out of bounds" struct page elements that fit completely | |
494 | * on the same pages that were allocated for the "in bounds" elements because they | |
495 | * may be referenced later (and found to be "reserved"). | |
496 | */ | |
497 | map_start -= ((unsigned long) map_start & (PAGE_SIZE - 1)) / sizeof(struct page); | |
498 | map_end += ((PAGE_ALIGN((unsigned long) map_end) - (unsigned long) map_end) | |
499 | / sizeof(struct page)); | |
500 | ||
501 | if (map_start < map_end) | |
502 | memmap_init_zone((unsigned long)(map_end - map_start), | |
a2f3aa02 DH |
503 | args->nid, args->zone, page_to_pfn(map_start), |
504 | MEMMAP_EARLY); | |
1da177e4 LT |
505 | return 0; |
506 | } | |
507 | ||
18b8befd | 508 | void __meminit |
1da177e4 LT |
509 | memmap_init (unsigned long size, int nid, unsigned long zone, |
510 | unsigned long start_pfn) | |
511 | { | |
512 | if (!vmem_map) | |
a2f3aa02 | 513 | memmap_init_zone(size, nid, zone, start_pfn, MEMMAP_EARLY); |
1da177e4 LT |
514 | else { |
515 | struct page *start; | |
516 | struct memmap_init_callback_data args; | |
517 | ||
518 | start = pfn_to_page(start_pfn); | |
519 | args.start = start; | |
520 | args.end = start + size; | |
521 | args.nid = nid; | |
522 | args.zone = zone; | |
523 | ||
524 | efi_memmap_walk(virtual_memmap_init, &args); | |
525 | } | |
526 | } | |
527 | ||
528 | int | |
529 | ia64_pfn_valid (unsigned long pfn) | |
530 | { | |
531 | char byte; | |
532 | struct page *pg = pfn_to_page(pfn); | |
533 | ||
534 | return (__get_user(byte, (char __user *) pg) == 0) | |
535 | && ((((u64)pg & PAGE_MASK) == (((u64)(pg + 1) - 1) & PAGE_MASK)) | |
536 | || (__get_user(byte, (char __user *) (pg + 1) - 1) == 0)); | |
537 | } | |
538 | EXPORT_SYMBOL(ia64_pfn_valid); | |
539 | ||
e088a4ad | 540 | int __init find_largest_hole(u64 start, u64 end, void *arg) |
1da177e4 LT |
541 | { |
542 | u64 *max_gap = arg; | |
543 | ||
544 | static u64 last_end = PAGE_OFFSET; | |
545 | ||
546 | /* NOTE: this algorithm assumes efi memmap table is ordered */ | |
547 | ||
548 | if (*max_gap < (start - last_end)) | |
549 | *max_gap = start - last_end; | |
550 | last_end = end; | |
551 | return 0; | |
552 | } | |
05e0caad | 553 | |
139b8304 BP |
554 | #endif /* CONFIG_VIRTUAL_MEM_MAP */ |
555 | ||
e088a4ad | 556 | int __init register_active_ranges(u64 start, u64 len, int nid) |
05e0caad | 557 | { |
98075d24 | 558 | u64 end = start + len; |
139b8304 | 559 | |
139b8304 BP |
560 | #ifdef CONFIG_KEXEC |
561 | if (start > crashk_res.start && start < crashk_res.end) | |
562 | start = crashk_res.end; | |
563 | if (end > crashk_res.start && end < crashk_res.end) | |
564 | end = crashk_res.start; | |
565 | #endif | |
566 | ||
567 | if (start < end) | |
98e4ae8a | 568 | memblock_add_node(__pa(start), end - start, nid); |
05e0caad MG |
569 | return 0; |
570 | } | |
1da177e4 | 571 | |
a3f5c338 | 572 | int |
e088a4ad | 573 | find_max_min_low_pfn (u64 start, u64 end, void *arg) |
a3f5c338 ZN |
574 | { |
575 | unsigned long pfn_start, pfn_end; | |
576 | #ifdef CONFIG_FLATMEM | |
577 | pfn_start = (PAGE_ALIGN(__pa(start))) >> PAGE_SHIFT; | |
578 | pfn_end = (PAGE_ALIGN(__pa(end - 1))) >> PAGE_SHIFT; | |
579 | #else | |
580 | pfn_start = GRANULEROUNDDOWN(__pa(start)) >> PAGE_SHIFT; | |
581 | pfn_end = GRANULEROUNDUP(__pa(end - 1)) >> PAGE_SHIFT; | |
582 | #endif | |
583 | min_low_pfn = min(min_low_pfn, pfn_start); | |
584 | max_low_pfn = max(max_low_pfn, pfn_end); | |
585 | return 0; | |
586 | } | |
587 | ||
1da177e4 LT |
588 | /* |
589 | * Boot command-line option "nolwsys" can be used to disable the use of any light-weight | |
590 | * system call handler. When this option is in effect, all fsyscalls will end up bubbling | |
591 | * down into the kernel and calling the normal (heavy-weight) syscall handler. This is | |
592 | * useful for performance testing, but conceivably could also come in handy for debugging | |
593 | * purposes. | |
594 | */ | |
595 | ||
03906ea0 | 596 | static int nolwsys __initdata; |
1da177e4 LT |
597 | |
598 | static int __init | |
599 | nolwsys_setup (char *s) | |
600 | { | |
601 | nolwsys = 1; | |
602 | return 1; | |
603 | } | |
604 | ||
605 | __setup("nolwsys", nolwsys_setup); | |
606 | ||
dae28066 | 607 | void __init |
1da177e4 LT |
608 | mem_init (void) |
609 | { | |
1da177e4 | 610 | int i; |
1da177e4 | 611 | |
fde740e4 RH |
612 | BUG_ON(PTRS_PER_PGD * sizeof(pgd_t) != PAGE_SIZE); |
613 | BUG_ON(PTRS_PER_PMD * sizeof(pmd_t) != PAGE_SIZE); | |
614 | BUG_ON(PTRS_PER_PTE * sizeof(pte_t) != PAGE_SIZE); | |
615 | ||
1da177e4 LT |
616 | #ifdef CONFIG_PCI |
617 | /* | |
618 | * This needs to be called _after_ the command line has been parsed but _before_ | |
619 | * any drivers that may need the PCI DMA interface are initialized or bootmem has | |
620 | * been freed. | |
621 | */ | |
622 | platform_dma_init(); | |
623 | #endif | |
624 | ||
2d4b1fa2 | 625 | #ifdef CONFIG_FLATMEM |
80a03e29 | 626 | BUG_ON(!mem_map); |
1da177e4 LT |
627 | #endif |
628 | ||
b57b63a2 | 629 | set_max_mapnr(max_low_pfn); |
1da177e4 | 630 | high_memory = __va(max_low_pfn * PAGE_SIZE); |
b57b63a2 | 631 | free_all_bootmem(); |
de4bcddc | 632 | mem_init_print_info(NULL); |
1da177e4 LT |
633 | |
634 | /* | |
635 | * For fsyscall entrpoints with no light-weight handler, use the ordinary | |
636 | * (heavy-weight) handler, but mark it by setting bit 0, so the fsyscall entry | |
637 | * code can tell them apart. | |
638 | */ | |
639 | for (i = 0; i < NR_syscalls; ++i) { | |
e55645ec | 640 | extern unsigned long fsyscall_table[NR_syscalls]; |
1da177e4 LT |
641 | extern unsigned long sys_call_table[NR_syscalls]; |
642 | ||
643 | if (!fsyscall_table[i] || nolwsys) | |
644 | fsyscall_table[i] = sys_call_table[i] | 1; | |
645 | } | |
646 | setup_gate(); | |
1da177e4 | 647 | } |
1681b8e1 YG |
648 | |
649 | #ifdef CONFIG_MEMORY_HOTPLUG | |
3d79a728 | 650 | int arch_add_memory(int nid, u64 start, u64 size, bool want_memblock) |
1681b8e1 | 651 | { |
1681b8e1 YG |
652 | unsigned long start_pfn = start >> PAGE_SHIFT; |
653 | unsigned long nr_pages = size >> PAGE_SHIFT; | |
654 | int ret; | |
655 | ||
3d79a728 | 656 | ret = __add_pages(nid, start_pfn, nr_pages, want_memblock); |
1681b8e1 YG |
657 | if (ret) |
658 | printk("%s: Problem encountered in __add_pages() as ret=%d\n", | |
d4ed8084 | 659 | __func__, ret); |
1681b8e1 YG |
660 | |
661 | return ret; | |
662 | } | |
24d335ca WC |
663 | |
664 | #ifdef CONFIG_MEMORY_HOTREMOVE | |
665 | int arch_remove_memory(u64 start, u64 size) | |
666 | { | |
667 | unsigned long start_pfn = start >> PAGE_SHIFT; | |
668 | unsigned long nr_pages = size >> PAGE_SHIFT; | |
669 | struct zone *zone; | |
670 | int ret; | |
671 | ||
672 | zone = page_zone(pfn_to_page(start_pfn)); | |
673 | ret = __remove_pages(zone, start_pfn, nr_pages); | |
674 | if (ret) | |
675 | pr_warn("%s: Problem encountered in __remove_pages() as" | |
676 | " ret=%d\n", __func__, ret); | |
677 | ||
678 | return ret; | |
679 | } | |
680 | #endif | |
1681b8e1 | 681 | #endif |