Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * This file is subject to the terms and conditions of the GNU General Public | |
3 | * License. See the file "COPYING" in the main directory of this archive | |
4 | * for more details. | |
5 | * | |
6 | * Copyright (C) 1994 - 2000 Ralf Baechle | |
7 | * Copyright (C) 1999, 2000 Silicon Graphics, Inc. | |
8 | * Kevin D. Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com | |
9 | * Copyright (C) 2000 MIPS Technologies, Inc. All rights reserved. | |
10 | */ | |
b868868a | 11 | #include <linux/bug.h> |
1da177e4 LT |
12 | #include <linux/init.h> |
13 | #include <linux/module.h> | |
14 | #include <linux/signal.h> | |
15 | #include <linux/sched.h> | |
16 | #include <linux/kernel.h> | |
17 | #include <linux/errno.h> | |
18 | #include <linux/string.h> | |
19 | #include <linux/types.h> | |
20 | #include <linux/pagemap.h> | |
21 | #include <linux/ptrace.h> | |
22 | #include <linux/mman.h> | |
23 | #include <linux/mm.h> | |
24 | #include <linux/bootmem.h> | |
25 | #include <linux/highmem.h> | |
26 | #include <linux/swap.h> | |
3d503753 | 27 | #include <linux/proc_fs.h> |
22a9835c | 28 | #include <linux/pfn.h> |
1da177e4 | 29 | |
9975e77d | 30 | #include <asm/asm-offsets.h> |
1da177e4 LT |
31 | #include <asm/bootinfo.h> |
32 | #include <asm/cachectl.h> | |
33 | #include <asm/cpu.h> | |
34 | #include <asm/dma.h> | |
f8829cae | 35 | #include <asm/kmap_types.h> |
1da177e4 LT |
36 | #include <asm/mmu_context.h> |
37 | #include <asm/sections.h> | |
38 | #include <asm/pgtable.h> | |
39 | #include <asm/pgalloc.h> | |
40 | #include <asm/tlb.h> | |
f8829cae RB |
41 | #include <asm/fixmap.h> |
42 | ||
43 | /* Atomicity and interruptability */ | |
44 | #ifdef CONFIG_MIPS_MT_SMTC | |
45 | ||
46 | #include <asm/mipsmtregs.h> | |
47 | ||
48 | #define ENTER_CRITICAL(flags) \ | |
49 | { \ | |
50 | unsigned int mvpflags; \ | |
51 | local_irq_save(flags);\ | |
52 | mvpflags = dvpe() | |
53 | #define EXIT_CRITICAL(flags) \ | |
54 | evpe(mvpflags); \ | |
55 | local_irq_restore(flags); \ | |
56 | } | |
57 | #else | |
58 | ||
59 | #define ENTER_CRITICAL(flags) local_irq_save(flags) | |
60 | #define EXIT_CRITICAL(flags) local_irq_restore(flags) | |
61 | ||
62 | #endif /* CONFIG_MIPS_MT_SMTC */ | |
1da177e4 LT |
63 | |
64 | DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); | |
65 | ||
1da177e4 LT |
66 | /* |
67 | * We have up to 8 empty zeroed pages so we can map one of the right colour | |
68 | * when needed. This is necessary only on R4000 / R4400 SC and MC versions | |
69 | * where we have to avoid VCED / VECI exceptions for good performance at | |
70 | * any price. Since page is never written to after the initialization we | |
71 | * don't have to care about aliases on other CPUs. | |
72 | */ | |
73 | unsigned long empty_zero_page, zero_page_mask; | |
74 | ||
75 | /* | |
76 | * Not static inline because used by IP27 special magic initialization code | |
77 | */ | |
78 | unsigned long setup_zero_pages(void) | |
79 | { | |
8dfcc9ba NP |
80 | unsigned int order; |
81 | unsigned long size; | |
1da177e4 LT |
82 | struct page *page; |
83 | ||
84 | if (cpu_has_vce) | |
85 | order = 3; | |
86 | else | |
87 | order = 0; | |
88 | ||
89 | empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order); | |
90 | if (!empty_zero_page) | |
91 | panic("Oh boy, that early out of memory?"); | |
92 | ||
99e3b942 | 93 | page = virt_to_page((void *)empty_zero_page); |
8dfcc9ba | 94 | split_page(page, order); |
99e3b942 | 95 | while (page < virt_to_page((void *)(empty_zero_page + (PAGE_SIZE << order)))) { |
68352e6e | 96 | SetPageReserved(page); |
1da177e4 LT |
97 | page++; |
98 | } | |
99 | ||
100 | size = PAGE_SIZE << order; | |
101 | zero_page_mask = (size - 1) & PAGE_MASK; | |
102 | ||
103 | return 1UL << order; | |
104 | } | |
105 | ||
f8829cae RB |
106 | /* |
107 | * These are almost like kmap_atomic / kunmap_atmic except they take an | |
108 | * additional address argument as the hint. | |
109 | */ | |
1da177e4 LT |
110 | |
111 | #define kmap_get_fixmap_pte(vaddr) \ | |
c6e8b587 | 112 | pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr), (vaddr)), (vaddr)), (vaddr)) |
1da177e4 | 113 | |
f8829cae RB |
114 | #ifdef CONFIG_MIPS_MT_SMTC |
115 | static pte_t *kmap_coherent_pte; | |
116 | static void __init kmap_coherent_init(void) | |
117 | { | |
118 | unsigned long vaddr; | |
119 | ||
120 | /* cache the first coherent kmap pte */ | |
121 | vaddr = __fix_to_virt(FIX_CMAP_BEGIN); | |
122 | kmap_coherent_pte = kmap_get_fixmap_pte(vaddr); | |
123 | } | |
124 | #else | |
125 | static inline void kmap_coherent_init(void) {} | |
126 | #endif | |
127 | ||
7575a49f | 128 | void *kmap_coherent(struct page *page, unsigned long addr) |
f8829cae RB |
129 | { |
130 | enum fixed_addresses idx; | |
131 | unsigned long vaddr, flags, entrylo; | |
132 | unsigned long old_ctx; | |
133 | pte_t pte; | |
134 | int tlbidx; | |
135 | ||
b868868a RB |
136 | BUG_ON(Page_dcache_dirty(page)); |
137 | ||
f8829cae RB |
138 | inc_preempt_count(); |
139 | idx = (addr >> PAGE_SHIFT) & (FIX_N_COLOURS - 1); | |
140 | #ifdef CONFIG_MIPS_MT_SMTC | |
141 | idx += FIX_N_COLOURS * smp_processor_id(); | |
142 | #endif | |
143 | vaddr = __fix_to_virt(FIX_CMAP_END - idx); | |
144 | pte = mk_pte(page, PAGE_KERNEL); | |
962f480e | 145 | #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32) |
f8829cae RB |
146 | entrylo = pte.pte_high; |
147 | #else | |
148 | entrylo = pte_val(pte) >> 6; | |
149 | #endif | |
150 | ||
151 | ENTER_CRITICAL(flags); | |
152 | old_ctx = read_c0_entryhi(); | |
153 | write_c0_entryhi(vaddr & (PAGE_MASK << 1)); | |
154 | write_c0_entrylo0(entrylo); | |
155 | write_c0_entrylo1(entrylo); | |
156 | #ifdef CONFIG_MIPS_MT_SMTC | |
157 | set_pte(kmap_coherent_pte - (FIX_CMAP_END - idx), pte); | |
158 | /* preload TLB instead of local_flush_tlb_one() */ | |
159 | mtc0_tlbw_hazard(); | |
160 | tlb_probe(); | |
161 | tlb_probe_hazard(); | |
162 | tlbidx = read_c0_index(); | |
163 | mtc0_tlbw_hazard(); | |
164 | if (tlbidx < 0) | |
165 | tlb_write_random(); | |
166 | else | |
167 | tlb_write_indexed(); | |
168 | #else | |
169 | tlbidx = read_c0_wired(); | |
170 | write_c0_wired(tlbidx + 1); | |
171 | write_c0_index(tlbidx); | |
172 | mtc0_tlbw_hazard(); | |
173 | tlb_write_indexed(); | |
174 | #endif | |
175 | tlbw_use_hazard(); | |
176 | write_c0_entryhi(old_ctx); | |
177 | EXIT_CRITICAL(flags); | |
178 | ||
179 | return (void*) vaddr; | |
180 | } | |
181 | ||
182 | #define UNIQUE_ENTRYHI(idx) (CKSEG0 + ((idx) << (PAGE_SHIFT + 1))) | |
183 | ||
eacb9d61 | 184 | void kunmap_coherent(void) |
f8829cae RB |
185 | { |
186 | #ifndef CONFIG_MIPS_MT_SMTC | |
187 | unsigned int wired; | |
188 | unsigned long flags, old_ctx; | |
189 | ||
190 | ENTER_CRITICAL(flags); | |
191 | old_ctx = read_c0_entryhi(); | |
192 | wired = read_c0_wired() - 1; | |
193 | write_c0_wired(wired); | |
194 | write_c0_index(wired); | |
195 | write_c0_entryhi(UNIQUE_ENTRYHI(wired)); | |
196 | write_c0_entrylo0(0); | |
197 | write_c0_entrylo1(0); | |
198 | mtc0_tlbw_hazard(); | |
199 | tlb_write_indexed(); | |
200 | tlbw_use_hazard(); | |
201 | write_c0_entryhi(old_ctx); | |
202 | EXIT_CRITICAL(flags); | |
203 | #endif | |
204 | dec_preempt_count(); | |
205 | preempt_check_resched(); | |
206 | } | |
207 | ||
bcd02280 AN |
208 | void copy_user_highpage(struct page *to, struct page *from, |
209 | unsigned long vaddr, struct vm_area_struct *vma) | |
210 | { | |
211 | void *vfrom, *vto; | |
212 | ||
213 | vto = kmap_atomic(to, KM_USER1); | |
9a74b3eb RB |
214 | if (cpu_has_dc_aliases && |
215 | page_mapped(from) && !Page_dcache_dirty(from)) { | |
bcd02280 AN |
216 | vfrom = kmap_coherent(from, vaddr); |
217 | copy_page(vto, vfrom); | |
eacb9d61 | 218 | kunmap_coherent(); |
bcd02280 AN |
219 | } else { |
220 | vfrom = kmap_atomic(from, KM_USER0); | |
221 | copy_page(vto, vfrom); | |
222 | kunmap_atomic(vfrom, KM_USER0); | |
223 | } | |
39b8d525 | 224 | if ((!cpu_has_ic_fills_f_dc) || |
bcd02280 AN |
225 | pages_do_alias((unsigned long)vto, vaddr & PAGE_MASK)) |
226 | flush_data_cache_page((unsigned long)vto); | |
227 | kunmap_atomic(vto, KM_USER1); | |
228 | /* Make sure this page is cleared on other CPU's too before using it */ | |
229 | smp_wmb(); | |
230 | } | |
231 | ||
232 | EXPORT_SYMBOL(copy_user_highpage); | |
233 | ||
f8829cae RB |
234 | void copy_to_user_page(struct vm_area_struct *vma, |
235 | struct page *page, unsigned long vaddr, void *dst, const void *src, | |
236 | unsigned long len) | |
237 | { | |
9a74b3eb RB |
238 | if (cpu_has_dc_aliases && |
239 | page_mapped(page) && !Page_dcache_dirty(page)) { | |
f8829cae RB |
240 | void *vto = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK); |
241 | memcpy(vto, src, len); | |
eacb9d61 | 242 | kunmap_coherent(); |
985c30ef | 243 | } else { |
f8829cae | 244 | memcpy(dst, src, len); |
985c30ef RB |
245 | if (cpu_has_dc_aliases) |
246 | SetPageDcacheDirty(page); | |
247 | } | |
f8829cae RB |
248 | if ((vma->vm_flags & VM_EXEC) && !cpu_has_ic_fills_f_dc) |
249 | flush_cache_page(vma, vaddr, page_to_pfn(page)); | |
250 | } | |
251 | ||
252 | EXPORT_SYMBOL(copy_to_user_page); | |
253 | ||
254 | void copy_from_user_page(struct vm_area_struct *vma, | |
255 | struct page *page, unsigned long vaddr, void *dst, const void *src, | |
256 | unsigned long len) | |
257 | { | |
9a74b3eb RB |
258 | if (cpu_has_dc_aliases && |
259 | page_mapped(page) && !Page_dcache_dirty(page)) { | |
985c30ef | 260 | void *vfrom = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK); |
f8829cae | 261 | memcpy(dst, vfrom, len); |
eacb9d61 | 262 | kunmap_coherent(); |
985c30ef | 263 | } else { |
f8829cae | 264 | memcpy(dst, src, len); |
985c30ef RB |
265 | if (cpu_has_dc_aliases) |
266 | SetPageDcacheDirty(page); | |
267 | } | |
f8829cae RB |
268 | } |
269 | ||
270 | EXPORT_SYMBOL(copy_from_user_page); | |
271 | ||
272 | ||
273 | #ifdef CONFIG_HIGHMEM | |
bf15f767 RB |
274 | unsigned long highstart_pfn, highend_pfn; |
275 | ||
f8829cae RB |
276 | pte_t *kmap_pte; |
277 | pgprot_t kmap_prot; | |
278 | ||
1da177e4 LT |
279 | static void __init kmap_init(void) |
280 | { | |
281 | unsigned long kmap_vstart; | |
282 | ||
283 | /* cache the first kmap pte */ | |
284 | kmap_vstart = __fix_to_virt(FIX_KMAP_BEGIN); | |
285 | kmap_pte = kmap_get_fixmap_pte(kmap_vstart); | |
286 | ||
287 | kmap_prot = PAGE_KERNEL; | |
288 | } | |
f8829cae | 289 | #endif /* CONFIG_HIGHMEM */ |
1da177e4 | 290 | |
84fd089a | 291 | void __init fixrange_init(unsigned long start, unsigned long end, |
1da177e4 LT |
292 | pgd_t *pgd_base) |
293 | { | |
f8829cae | 294 | #if defined(CONFIG_HIGHMEM) || defined(CONFIG_MIPS_MT_SMTC) |
1da177e4 | 295 | pgd_t *pgd; |
c6e8b587 | 296 | pud_t *pud; |
1da177e4 LT |
297 | pmd_t *pmd; |
298 | pte_t *pte; | |
c6e8b587 | 299 | int i, j, k; |
1da177e4 LT |
300 | unsigned long vaddr; |
301 | ||
302 | vaddr = start; | |
303 | i = __pgd_offset(vaddr); | |
c6e8b587 RB |
304 | j = __pud_offset(vaddr); |
305 | k = __pmd_offset(vaddr); | |
1da177e4 LT |
306 | pgd = pgd_base + i; |
307 | ||
308 | for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) { | |
c6e8b587 RB |
309 | pud = (pud_t *)pgd; |
310 | for ( ; (j < PTRS_PER_PUD) && (vaddr != end); pud++, j++) { | |
311 | pmd = (pmd_t *)pud; | |
312 | for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) { | |
313 | if (pmd_none(*pmd)) { | |
314 | pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE); | |
f8829cae | 315 | set_pmd(pmd, __pmd((unsigned long)pte)); |
c6e8b587 RB |
316 | if (pte != pte_offset_kernel(pmd, 0)) |
317 | BUG(); | |
318 | } | |
319 | vaddr += PMD_SIZE; | |
1da177e4 | 320 | } |
c6e8b587 | 321 | k = 0; |
1da177e4 LT |
322 | } |
323 | j = 0; | |
324 | } | |
f8829cae | 325 | #endif |
1da177e4 | 326 | } |
1da177e4 | 327 | |
b4819b59 | 328 | #ifndef CONFIG_NEED_MULTIPLE_NODES |
565200a1 AN |
329 | static int __init page_is_ram(unsigned long pagenr) |
330 | { | |
331 | int i; | |
332 | ||
333 | for (i = 0; i < boot_mem_map.nr_map; i++) { | |
334 | unsigned long addr, end; | |
335 | ||
336 | if (boot_mem_map.map[i].type != BOOT_MEM_RAM) | |
337 | /* not usable memory */ | |
338 | continue; | |
339 | ||
340 | addr = PFN_UP(boot_mem_map.map[i].addr); | |
341 | end = PFN_DOWN(boot_mem_map.map[i].addr + | |
342 | boot_mem_map.map[i].size); | |
343 | ||
344 | if (pagenr >= addr && pagenr < end) | |
345 | return 1; | |
346 | } | |
347 | ||
348 | return 0; | |
349 | } | |
350 | ||
1da177e4 LT |
351 | void __init paging_init(void) |
352 | { | |
cce335ae RB |
353 | unsigned long max_zone_pfns[MAX_NR_ZONES]; |
354 | unsigned long lastpfn; | |
1da177e4 LT |
355 | |
356 | pagetable_init(); | |
357 | ||
358 | #ifdef CONFIG_HIGHMEM | |
359 | kmap_init(); | |
360 | #endif | |
f8829cae | 361 | kmap_coherent_init(); |
1da177e4 | 362 | |
05502339 | 363 | #ifdef CONFIG_ZONE_DMA |
cce335ae | 364 | max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN; |
1da177e4 | 365 | #endif |
cce335ae RB |
366 | #ifdef CONFIG_ZONE_DMA32 |
367 | max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN; | |
368 | #endif | |
369 | max_zone_pfns[ZONE_NORMAL] = max_low_pfn; | |
370 | lastpfn = max_low_pfn; | |
1da177e4 | 371 | #ifdef CONFIG_HIGHMEM |
cce335ae RB |
372 | max_zone_pfns[ZONE_HIGHMEM] = highend_pfn; |
373 | lastpfn = highend_pfn; | |
cbb8fc07 | 374 | |
cce335ae | 375 | if (cpu_has_dc_aliases && max_low_pfn != highend_pfn) { |
cbb8fc07 | 376 | printk(KERN_WARNING "This processor doesn't support highmem." |
cce335ae RB |
377 | " %ldk highmem ignored\n", |
378 | (highend_pfn - max_low_pfn) << (PAGE_SHIFT - 10)); | |
379 | max_zone_pfns[ZONE_HIGHMEM] = max_low_pfn; | |
380 | lastpfn = max_low_pfn; | |
cbb8fc07 | 381 | } |
1da177e4 LT |
382 | #endif |
383 | ||
cce335ae | 384 | free_area_init_nodes(max_zone_pfns); |
1da177e4 LT |
385 | } |
386 | ||
3d503753 DJ |
387 | static struct kcore_list kcore_mem, kcore_vmalloc; |
388 | #ifdef CONFIG_64BIT | |
389 | static struct kcore_list kcore_kseg0; | |
390 | #endif | |
391 | ||
1da177e4 LT |
392 | void __init mem_init(void) |
393 | { | |
394 | unsigned long codesize, reservedpages, datasize, initsize; | |
395 | unsigned long tmp, ram; | |
396 | ||
397 | #ifdef CONFIG_HIGHMEM | |
398 | #ifdef CONFIG_DISCONTIGMEM | |
399 | #error "CONFIG_HIGHMEM and CONFIG_DISCONTIGMEM dont work together yet" | |
400 | #endif | |
565200a1 | 401 | max_mapnr = highend_pfn; |
1da177e4 | 402 | #else |
565200a1 | 403 | max_mapnr = max_low_pfn; |
1da177e4 LT |
404 | #endif |
405 | high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT); | |
406 | ||
407 | totalram_pages += free_all_bootmem(); | |
408 | totalram_pages -= setup_zero_pages(); /* Setup zeroed pages. */ | |
409 | ||
410 | reservedpages = ram = 0; | |
411 | for (tmp = 0; tmp < max_low_pfn; tmp++) | |
412 | if (page_is_ram(tmp)) { | |
413 | ram++; | |
b1c231f5 | 414 | if (PageReserved(pfn_to_page(tmp))) |
1da177e4 LT |
415 | reservedpages++; |
416 | } | |
565200a1 | 417 | num_physpages = ram; |
1da177e4 LT |
418 | |
419 | #ifdef CONFIG_HIGHMEM | |
420 | for (tmp = highstart_pfn; tmp < highend_pfn; tmp++) { | |
a8049c53 | 421 | struct page *page = pfn_to_page(tmp); |
1da177e4 LT |
422 | |
423 | if (!page_is_ram(tmp)) { | |
424 | SetPageReserved(page); | |
425 | continue; | |
426 | } | |
427 | ClearPageReserved(page); | |
7835e98b | 428 | init_page_count(page); |
1da177e4 LT |
429 | __free_page(page); |
430 | totalhigh_pages++; | |
431 | } | |
432 | totalram_pages += totalhigh_pages; | |
565200a1 | 433 | num_physpages += totalhigh_pages; |
1da177e4 LT |
434 | #endif |
435 | ||
436 | codesize = (unsigned long) &_etext - (unsigned long) &_text; | |
437 | datasize = (unsigned long) &_edata - (unsigned long) &_etext; | |
438 | initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; | |
439 | ||
3d503753 DJ |
440 | #ifdef CONFIG_64BIT |
441 | if ((unsigned long) &_text > (unsigned long) CKSEG0) | |
442 | /* The -4 is a hack so that user tools don't have to handle | |
443 | the overflow. */ | |
444 | kclist_add(&kcore_kseg0, (void *) CKSEG0, 0x80000000 - 4); | |
445 | #endif | |
446 | kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT); | |
447 | kclist_add(&kcore_vmalloc, (void *)VMALLOC_START, | |
448 | VMALLOC_END-VMALLOC_START); | |
449 | ||
1da177e4 LT |
450 | printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, " |
451 | "%ldk reserved, %ldk data, %ldk init, %ldk highmem)\n", | |
452 | (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), | |
453 | ram << (PAGE_SHIFT-10), | |
454 | codesize >> 10, | |
455 | reservedpages << (PAGE_SHIFT-10), | |
456 | datasize >> 10, | |
457 | initsize >> 10, | |
458 | (unsigned long) (totalhigh_pages << (PAGE_SHIFT-10))); | |
459 | } | |
b4819b59 | 460 | #endif /* !CONFIG_NEED_MULTIPLE_NODES */ |
1da177e4 | 461 | |
c44e8d5e | 462 | void free_init_pages(const char *what, unsigned long begin, unsigned long end) |
6fd11a21 | 463 | { |
acd86b86 | 464 | unsigned long pfn; |
6fd11a21 | 465 | |
acd86b86 FBH |
466 | for (pfn = PFN_UP(begin); pfn < PFN_DOWN(end); pfn++) { |
467 | struct page *page = pfn_to_page(pfn); | |
468 | void *addr = phys_to_virt(PFN_PHYS(pfn)); | |
469 | ||
470 | ClearPageReserved(page); | |
471 | init_page_count(page); | |
472 | memset(addr, POISON_FREE_INITMEM, PAGE_SIZE); | |
473 | __free_page(page); | |
6fd11a21 RB |
474 | totalram_pages++; |
475 | } | |
476 | printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10); | |
477 | } | |
478 | ||
1da177e4 LT |
479 | #ifdef CONFIG_BLK_DEV_INITRD |
480 | void free_initrd_mem(unsigned long start, unsigned long end) | |
481 | { | |
acd86b86 FBH |
482 | free_init_pages("initrd memory", |
483 | virt_to_phys((void *)start), | |
484 | virt_to_phys((void *)end)); | |
1da177e4 LT |
485 | } |
486 | #endif | |
487 | ||
fb4bb133 | 488 | void __init_refok free_initmem(void) |
1da177e4 | 489 | { |
c44e8d5e | 490 | prom_free_prom_memory(); |
acd86b86 FBH |
491 | free_init_pages("unused kernel memory", |
492 | __pa_symbol(&__init_begin), | |
493 | __pa_symbol(&__init_end)); | |
1da177e4 | 494 | } |
69a6c312 AN |
495 | |
496 | unsigned long pgd_current[NR_CPUS]; | |
497 | /* | |
498 | * On 64-bit we've got three-level pagetables with a slightly | |
499 | * different layout ... | |
500 | */ | |
501 | #define __page_aligned(order) __attribute__((__aligned__(PAGE_SIZE<<order))) | |
9975e77d RB |
502 | |
503 | /* | |
504 | * gcc 3.3 and older have trouble determining that PTRS_PER_PGD and PGD_ORDER | |
505 | * are constants. So we use the variants from asm-offset.h until that gcc | |
506 | * will officially be retired. | |
507 | */ | |
508 | pgd_t swapper_pg_dir[_PTRS_PER_PGD] __page_aligned(_PGD_ORDER); | |
69a6c312 AN |
509 | #ifdef CONFIG_64BIT |
510 | #ifdef MODULE_START | |
511 | pgd_t module_pg_dir[PTRS_PER_PGD] __page_aligned(PGD_ORDER); | |
512 | #endif | |
513 | pmd_t invalid_pmd_table[PTRS_PER_PMD] __page_aligned(PMD_ORDER); | |
514 | #endif | |
515 | pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned(PTE_ORDER); |