Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
1da177e4 LT |
2 | * Re-map IO memory to kernel address space so that we can access it. |
3 | * This is needed for high PCI addresses that aren't mapped in the | |
4 | * 640k-1MB IO memory area on PC's | |
5 | * | |
6 | * (C) Copyright 1995 1996 Linus Torvalds | |
7 | */ | |
8 | ||
e9332cac | 9 | #include <linux/bootmem.h> |
1da177e4 | 10 | #include <linux/init.h> |
a148ecfd | 11 | #include <linux/io.h> |
3cbd09e4 TG |
12 | #include <linux/module.h> |
13 | #include <linux/slab.h> | |
14 | #include <linux/vmalloc.h> | |
15 | ||
1da177e4 | 16 | #include <asm/cacheflush.h> |
3cbd09e4 TG |
17 | #include <asm/e820.h> |
18 | #include <asm/fixmap.h> | |
1da177e4 | 19 | #include <asm/pgtable.h> |
3cbd09e4 | 20 | #include <asm/tlbflush.h> |
f6df72e7 | 21 | #include <asm/pgalloc.h> |
1da177e4 | 22 | |
d806e5ee TG |
23 | enum ioremap_mode { |
24 | IOR_MODE_UNCACHED, | |
25 | IOR_MODE_CACHED, | |
26 | }; | |
27 | ||
240d3a7c TG |
28 | #ifdef CONFIG_X86_64 |
29 | ||
30 | unsigned long __phys_addr(unsigned long x) | |
31 | { | |
32 | if (x >= __START_KERNEL_map) | |
33 | return x - __START_KERNEL_map + phys_base; | |
34 | return x - PAGE_OFFSET; | |
35 | } | |
36 | EXPORT_SYMBOL(__phys_addr); | |
37 | ||
e3100c82 TG |
38 | static inline int phys_addr_valid(unsigned long addr) |
39 | { | |
40 | return addr < (1UL << boot_cpu_data.x86_phys_bits); | |
41 | } | |
42 | ||
43 | #else | |
44 | ||
45 | static inline int phys_addr_valid(unsigned long addr) | |
46 | { | |
47 | return 1; | |
48 | } | |
49 | ||
240d3a7c TG |
50 | #endif |
51 | ||
5f5192b9 TG |
52 | int page_is_ram(unsigned long pagenr) |
53 | { | |
54 | unsigned long addr, end; | |
55 | int i; | |
56 | ||
d8a9e6a5 AV |
57 | /* |
58 | * A special case is the first 4Kb of memory; | |
59 | * This is a BIOS owned area, not kernel ram, but generally | |
60 | * not listed as such in the E820 table. | |
61 | */ | |
62 | if (pagenr == 0) | |
63 | return 0; | |
64 | ||
156fbc3f AV |
65 | /* |
66 | * Second special case: Some BIOSen report the PC BIOS | |
67 | * area (640->1Mb) as ram even though it is not. | |
68 | */ | |
69 | if (pagenr >= (BIOS_BEGIN >> PAGE_SHIFT) && | |
70 | pagenr < (BIOS_END >> PAGE_SHIFT)) | |
71 | return 0; | |
d8a9e6a5 | 72 | |
5f5192b9 TG |
73 | for (i = 0; i < e820.nr_map; i++) { |
74 | /* | |
75 | * Not usable memory: | |
76 | */ | |
77 | if (e820.map[i].type != E820_RAM) | |
78 | continue; | |
5f5192b9 TG |
79 | addr = (e820.map[i].addr + PAGE_SIZE-1) >> PAGE_SHIFT; |
80 | end = (e820.map[i].addr + e820.map[i].size) >> PAGE_SHIFT; | |
950f9d95 | 81 | |
950f9d95 | 82 | |
5f5192b9 TG |
83 | if ((pagenr >= addr) && (pagenr < end)) |
84 | return 1; | |
85 | } | |
86 | return 0; | |
87 | } | |
88 | ||
e9332cac TG |
89 | /* |
90 | * Fix up the linear direct mapping of the kernel to avoid cache attribute | |
91 | * conflicts. | |
92 | */ | |
75ab43bf | 93 | static int ioremap_change_attr(unsigned long vaddr, unsigned long size, |
d806e5ee | 94 | enum ioremap_mode mode) |
e9332cac | 95 | { |
d806e5ee | 96 | unsigned long nrpages = size >> PAGE_SHIFT; |
93809be8 | 97 | int err; |
e9332cac | 98 | |
d806e5ee TG |
99 | switch (mode) { |
100 | case IOR_MODE_UNCACHED: | |
101 | default: | |
102 | err = set_memory_uc(vaddr, nrpages); | |
103 | break; | |
104 | case IOR_MODE_CACHED: | |
105 | err = set_memory_wb(vaddr, nrpages); | |
106 | break; | |
107 | } | |
e9332cac TG |
108 | |
109 | return err; | |
110 | } | |
111 | ||
1da177e4 LT |
112 | /* |
113 | * Remap an arbitrary physical address space into the kernel virtual | |
114 | * address space. Needed when the kernel wants to access high addresses | |
115 | * directly. | |
116 | * | |
117 | * NOTE! We need to allow non-page-aligned mappings too: we will obviously | |
118 | * have to convert them into an offset in a page-aligned mapping, but the | |
119 | * caller shouldn't need to know that small detail. | |
120 | */ | |
b9e76a00 | 121 | static void __iomem *__ioremap(resource_size_t phys_addr, unsigned long size, |
d806e5ee | 122 | enum ioremap_mode mode) |
1da177e4 | 123 | { |
e66aadbe | 124 | unsigned long pfn, offset, last_addr, vaddr; |
91eebf40 | 125 | struct vm_struct *area; |
d806e5ee | 126 | pgprot_t prot; |
1da177e4 LT |
127 | |
128 | /* Don't allow wraparound or zero size */ | |
129 | last_addr = phys_addr + size - 1; | |
130 | if (!size || last_addr < phys_addr) | |
131 | return NULL; | |
132 | ||
e3100c82 TG |
133 | if (!phys_addr_valid(phys_addr)) { |
134 | printk(KERN_WARNING "ioremap: invalid physical address %lx\n", | |
135 | phys_addr); | |
136 | WARN_ON_ONCE(1); | |
137 | return NULL; | |
138 | } | |
139 | ||
1da177e4 LT |
140 | /* |
141 | * Don't remap the low PCI/ISA area, it's always mapped.. | |
142 | */ | |
143 | if (phys_addr >= ISA_START_ADDRESS && last_addr < ISA_END_ADDRESS) | |
4b40fcee | 144 | return (__force void __iomem *)phys_to_virt(phys_addr); |
1da177e4 LT |
145 | |
146 | /* | |
147 | * Don't allow anybody to remap normal RAM that we're using.. | |
148 | */ | |
bdd3cee2 IM |
149 | for (pfn = phys_addr >> PAGE_SHIFT; |
150 | (pfn << PAGE_SHIFT) < last_addr; pfn++) { | |
151 | ||
ba748d22 IM |
152 | int is_ram = page_is_ram(pfn); |
153 | ||
154 | if (is_ram && pfn_valid(pfn) && !PageReserved(pfn_to_page(pfn))) | |
266b9f87 | 155 | return NULL; |
ba748d22 | 156 | WARN_ON_ONCE(is_ram); |
1da177e4 LT |
157 | } |
158 | ||
d806e5ee TG |
159 | switch (mode) { |
160 | case IOR_MODE_UNCACHED: | |
161 | default: | |
55c62682 | 162 | prot = PAGE_KERNEL_NOCACHE; |
d806e5ee TG |
163 | break; |
164 | case IOR_MODE_CACHED: | |
165 | prot = PAGE_KERNEL; | |
166 | break; | |
167 | } | |
a148ecfd | 168 | |
1da177e4 LT |
169 | /* |
170 | * Mappings have to be page-aligned | |
171 | */ | |
172 | offset = phys_addr & ~PAGE_MASK; | |
173 | phys_addr &= PAGE_MASK; | |
174 | size = PAGE_ALIGN(last_addr+1) - phys_addr; | |
175 | ||
176 | /* | |
177 | * Ok, go for it.. | |
178 | */ | |
74ff2857 | 179 | area = get_vm_area(size, VM_IOREMAP); |
1da177e4 LT |
180 | if (!area) |
181 | return NULL; | |
182 | area->phys_addr = phys_addr; | |
e66aadbe TG |
183 | vaddr = (unsigned long) area->addr; |
184 | if (ioremap_page_range(vaddr, vaddr + size, phys_addr, prot)) { | |
b16bf712 | 185 | free_vm_area(area); |
1da177e4 LT |
186 | return NULL; |
187 | } | |
e9332cac | 188 | |
75ab43bf | 189 | if (ioremap_change_attr(vaddr, size, mode) < 0) { |
e66aadbe | 190 | vunmap(area->addr); |
e9332cac TG |
191 | return NULL; |
192 | } | |
193 | ||
e66aadbe | 194 | return (void __iomem *) (vaddr + offset); |
1da177e4 | 195 | } |
1da177e4 LT |
196 | |
197 | /** | |
198 | * ioremap_nocache - map bus memory into CPU space | |
199 | * @offset: bus address of the memory | |
200 | * @size: size of the resource to map | |
201 | * | |
202 | * ioremap_nocache performs a platform specific sequence of operations to | |
203 | * make bus memory CPU accessible via the readb/readw/readl/writeb/ | |
204 | * writew/writel functions and the other mmio helpers. The returned | |
205 | * address is not guaranteed to be usable directly as a virtual | |
91eebf40 | 206 | * address. |
1da177e4 LT |
207 | * |
208 | * This version of ioremap ensures that the memory is marked uncachable | |
209 | * on the CPU as well as honouring existing caching rules from things like | |
91eebf40 | 210 | * the PCI bus. Note that there are other caches and buffers on many |
1da177e4 LT |
211 | * busses. In particular driver authors should read up on PCI writes |
212 | * | |
213 | * It's useful if some control registers are in such an area and | |
214 | * write combining or read caching is not desirable: | |
91eebf40 | 215 | * |
1da177e4 LT |
216 | * Must be freed with iounmap. |
217 | */ | |
b9e76a00 | 218 | void __iomem *ioremap_nocache(resource_size_t phys_addr, unsigned long size) |
1da177e4 | 219 | { |
d806e5ee | 220 | return __ioremap(phys_addr, size, IOR_MODE_UNCACHED); |
1da177e4 | 221 | } |
129f6946 | 222 | EXPORT_SYMBOL(ioremap_nocache); |
1da177e4 | 223 | |
b9e76a00 | 224 | void __iomem *ioremap_cache(resource_size_t phys_addr, unsigned long size) |
5f868152 | 225 | { |
d806e5ee | 226 | return __ioremap(phys_addr, size, IOR_MODE_CACHED); |
5f868152 TG |
227 | } |
228 | EXPORT_SYMBOL(ioremap_cache); | |
229 | ||
bf5421c3 AK |
230 | /** |
231 | * iounmap - Free a IO remapping | |
232 | * @addr: virtual address from ioremap_* | |
233 | * | |
234 | * Caller must ensure there is only one unmapping for the same pointer. | |
235 | */ | |
1da177e4 LT |
236 | void iounmap(volatile void __iomem *addr) |
237 | { | |
bf5421c3 | 238 | struct vm_struct *p, *o; |
c23a4e96 AM |
239 | |
240 | if ((void __force *)addr <= high_memory) | |
1da177e4 LT |
241 | return; |
242 | ||
243 | /* | |
244 | * __ioremap special-cases the PCI/ISA range by not instantiating a | |
245 | * vm_area and by simply returning an address into the kernel mapping | |
246 | * of ISA space. So handle that here. | |
247 | */ | |
248 | if (addr >= phys_to_virt(ISA_START_ADDRESS) && | |
91eebf40 | 249 | addr < phys_to_virt(ISA_END_ADDRESS)) |
1da177e4 LT |
250 | return; |
251 | ||
91eebf40 TG |
252 | addr = (volatile void __iomem *) |
253 | (PAGE_MASK & (unsigned long __force)addr); | |
bf5421c3 AK |
254 | |
255 | /* Use the vm area unlocked, assuming the caller | |
256 | ensures there isn't another iounmap for the same address | |
257 | in parallel. Reuse of the virtual address is prevented by | |
258 | leaving it in the global lists until we're done with it. | |
259 | cpa takes care of the direct mappings. */ | |
260 | read_lock(&vmlist_lock); | |
261 | for (p = vmlist; p; p = p->next) { | |
262 | if (p->addr == addr) | |
263 | break; | |
264 | } | |
265 | read_unlock(&vmlist_lock); | |
266 | ||
267 | if (!p) { | |
91eebf40 | 268 | printk(KERN_ERR "iounmap: bad address %p\n", addr); |
c23a4e96 | 269 | dump_stack(); |
bf5421c3 | 270 | return; |
1da177e4 LT |
271 | } |
272 | ||
bf5421c3 AK |
273 | /* Finally remove it */ |
274 | o = remove_vm_area((void *)addr); | |
275 | BUG_ON(p != o || o == NULL); | |
91eebf40 | 276 | kfree(p); |
1da177e4 | 277 | } |
129f6946 | 278 | EXPORT_SYMBOL(iounmap); |
1da177e4 | 279 | |
240d3a7c | 280 | #ifdef CONFIG_X86_32 |
d18d6d65 IM |
281 | |
282 | int __initdata early_ioremap_debug; | |
283 | ||
284 | static int __init early_ioremap_debug_setup(char *str) | |
285 | { | |
286 | early_ioremap_debug = 1; | |
287 | ||
793b24a2 | 288 | return 0; |
d18d6d65 | 289 | } |
793b24a2 | 290 | early_param("early_ioremap_debug", early_ioremap_debug_setup); |
d18d6d65 | 291 | |
0947b2f3 | 292 | static __initdata int after_paging_init; |
c92a7a54 IC |
293 | static pte_t bm_pte[PAGE_SIZE/sizeof(pte_t)] |
294 | __section(.bss.page_aligned); | |
0947b2f3 | 295 | |
551889a6 | 296 | static inline pmd_t * __init early_ioremap_pmd(unsigned long addr) |
0947b2f3 | 297 | { |
37cc8d7f JF |
298 | /* Don't assume we're using swapper_pg_dir at this point */ |
299 | pgd_t *base = __va(read_cr3()); | |
300 | pgd_t *pgd = &base[pgd_index(addr)]; | |
551889a6 IC |
301 | pud_t *pud = pud_offset(pgd, addr); |
302 | pmd_t *pmd = pmd_offset(pud, addr); | |
303 | ||
304 | return pmd; | |
0947b2f3 HY |
305 | } |
306 | ||
551889a6 | 307 | static inline pte_t * __init early_ioremap_pte(unsigned long addr) |
0947b2f3 | 308 | { |
551889a6 | 309 | return &bm_pte[pte_index(addr)]; |
0947b2f3 HY |
310 | } |
311 | ||
beacfaac | 312 | void __init early_ioremap_init(void) |
0947b2f3 | 313 | { |
551889a6 | 314 | pmd_t *pmd; |
0947b2f3 | 315 | |
d18d6d65 | 316 | if (early_ioremap_debug) |
adafdf6a | 317 | printk(KERN_INFO "early_ioremap_init()\n"); |
d18d6d65 | 318 | |
551889a6 | 319 | pmd = early_ioremap_pmd(fix_to_virt(FIX_BTMAP_BEGIN)); |
0947b2f3 | 320 | memset(bm_pte, 0, sizeof(bm_pte)); |
b6fbb669 | 321 | pmd_populate_kernel(&init_mm, pmd, bm_pte); |
551889a6 | 322 | |
0e3a9549 | 323 | /* |
551889a6 | 324 | * The boot-ioremap range spans multiple pmds, for which |
0e3a9549 IM |
325 | * we are not prepared: |
326 | */ | |
551889a6 | 327 | if (pmd != early_ioremap_pmd(fix_to_virt(FIX_BTMAP_END))) { |
0e3a9549 | 328 | WARN_ON(1); |
551889a6 IC |
329 | printk(KERN_WARNING "pmd %p != %p\n", |
330 | pmd, early_ioremap_pmd(fix_to_virt(FIX_BTMAP_END))); | |
91eebf40 | 331 | printk(KERN_WARNING "fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n", |
551889a6 | 332 | fix_to_virt(FIX_BTMAP_BEGIN)); |
91eebf40 | 333 | printk(KERN_WARNING "fix_to_virt(FIX_BTMAP_END): %08lx\n", |
551889a6 | 334 | fix_to_virt(FIX_BTMAP_END)); |
91eebf40 TG |
335 | |
336 | printk(KERN_WARNING "FIX_BTMAP_END: %d\n", FIX_BTMAP_END); | |
337 | printk(KERN_WARNING "FIX_BTMAP_BEGIN: %d\n", | |
338 | FIX_BTMAP_BEGIN); | |
0e3a9549 | 339 | } |
0947b2f3 HY |
340 | } |
341 | ||
beacfaac | 342 | void __init early_ioremap_clear(void) |
0947b2f3 | 343 | { |
551889a6 | 344 | pmd_t *pmd; |
0947b2f3 | 345 | |
d18d6d65 | 346 | if (early_ioremap_debug) |
adafdf6a | 347 | printk(KERN_INFO "early_ioremap_clear()\n"); |
d18d6d65 | 348 | |
551889a6 IC |
349 | pmd = early_ioremap_pmd(fix_to_virt(FIX_BTMAP_BEGIN)); |
350 | pmd_clear(pmd); | |
b6fbb669 | 351 | paravirt_release_pt(__pa(bm_pte) >> PAGE_SHIFT); |
0947b2f3 HY |
352 | __flush_tlb_all(); |
353 | } | |
354 | ||
beacfaac | 355 | void __init early_ioremap_reset(void) |
0947b2f3 HY |
356 | { |
357 | enum fixed_addresses idx; | |
551889a6 IC |
358 | unsigned long addr, phys; |
359 | pte_t *pte; | |
0947b2f3 HY |
360 | |
361 | after_paging_init = 1; | |
64a8f852 | 362 | for (idx = FIX_BTMAP_BEGIN; idx >= FIX_BTMAP_END; idx--) { |
0947b2f3 | 363 | addr = fix_to_virt(idx); |
beacfaac | 364 | pte = early_ioremap_pte(addr); |
551889a6 IC |
365 | if (pte_present(*pte)) { |
366 | phys = pte_val(*pte) & PAGE_MASK; | |
0947b2f3 HY |
367 | set_fixmap(idx, phys); |
368 | } | |
369 | } | |
370 | } | |
371 | ||
beacfaac | 372 | static void __init __early_set_fixmap(enum fixed_addresses idx, |
0947b2f3 HY |
373 | unsigned long phys, pgprot_t flags) |
374 | { | |
551889a6 IC |
375 | unsigned long addr = __fix_to_virt(idx); |
376 | pte_t *pte; | |
0947b2f3 HY |
377 | |
378 | if (idx >= __end_of_fixed_addresses) { | |
379 | BUG(); | |
380 | return; | |
381 | } | |
beacfaac | 382 | pte = early_ioremap_pte(addr); |
0947b2f3 | 383 | if (pgprot_val(flags)) |
551889a6 | 384 | set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, flags)); |
0947b2f3 | 385 | else |
551889a6 | 386 | pte_clear(NULL, addr, pte); |
0947b2f3 HY |
387 | __flush_tlb_one(addr); |
388 | } | |
389 | ||
beacfaac | 390 | static inline void __init early_set_fixmap(enum fixed_addresses idx, |
0947b2f3 HY |
391 | unsigned long phys) |
392 | { | |
393 | if (after_paging_init) | |
394 | set_fixmap(idx, phys); | |
395 | else | |
beacfaac | 396 | __early_set_fixmap(idx, phys, PAGE_KERNEL); |
0947b2f3 HY |
397 | } |
398 | ||
beacfaac | 399 | static inline void __init early_clear_fixmap(enum fixed_addresses idx) |
0947b2f3 HY |
400 | { |
401 | if (after_paging_init) | |
402 | clear_fixmap(idx); | |
403 | else | |
beacfaac | 404 | __early_set_fixmap(idx, 0, __pgprot(0)); |
0947b2f3 HY |
405 | } |
406 | ||
1b42f516 IM |
407 | |
408 | int __initdata early_ioremap_nested; | |
409 | ||
d690b2af IM |
410 | static int __init check_early_ioremap_leak(void) |
411 | { | |
412 | if (!early_ioremap_nested) | |
413 | return 0; | |
414 | ||
415 | printk(KERN_WARNING | |
91eebf40 TG |
416 | "Debug warning: early ioremap leak of %d areas detected.\n", |
417 | early_ioremap_nested); | |
d690b2af | 418 | printk(KERN_WARNING |
91eebf40 | 419 | "please boot with early_ioremap_debug and report the dmesg.\n"); |
d690b2af IM |
420 | WARN_ON(1); |
421 | ||
422 | return 1; | |
423 | } | |
424 | late_initcall(check_early_ioremap_leak); | |
425 | ||
beacfaac | 426 | void __init *early_ioremap(unsigned long phys_addr, unsigned long size) |
1da177e4 LT |
427 | { |
428 | unsigned long offset, last_addr; | |
1b42f516 IM |
429 | unsigned int nrpages, nesting; |
430 | enum fixed_addresses idx0, idx; | |
431 | ||
432 | WARN_ON(system_state != SYSTEM_BOOTING); | |
433 | ||
434 | nesting = early_ioremap_nested; | |
d18d6d65 | 435 | if (early_ioremap_debug) { |
adafdf6a | 436 | printk(KERN_INFO "early_ioremap(%08lx, %08lx) [%d] => ", |
91eebf40 | 437 | phys_addr, size, nesting); |
d18d6d65 IM |
438 | dump_stack(); |
439 | } | |
1da177e4 LT |
440 | |
441 | /* Don't allow wraparound or zero size */ | |
442 | last_addr = phys_addr + size - 1; | |
bd796ed0 IM |
443 | if (!size || last_addr < phys_addr) { |
444 | WARN_ON(1); | |
1da177e4 | 445 | return NULL; |
bd796ed0 | 446 | } |
1da177e4 | 447 | |
bd796ed0 IM |
448 | if (nesting >= FIX_BTMAPS_NESTING) { |
449 | WARN_ON(1); | |
1b42f516 | 450 | return NULL; |
bd796ed0 | 451 | } |
1b42f516 | 452 | early_ioremap_nested++; |
1da177e4 LT |
453 | /* |
454 | * Mappings have to be page-aligned | |
455 | */ | |
456 | offset = phys_addr & ~PAGE_MASK; | |
457 | phys_addr &= PAGE_MASK; | |
458 | size = PAGE_ALIGN(last_addr) - phys_addr; | |
459 | ||
460 | /* | |
461 | * Mappings have to fit in the FIX_BTMAP area. | |
462 | */ | |
463 | nrpages = size >> PAGE_SHIFT; | |
bd796ed0 IM |
464 | if (nrpages > NR_FIX_BTMAPS) { |
465 | WARN_ON(1); | |
1da177e4 | 466 | return NULL; |
bd796ed0 | 467 | } |
1da177e4 LT |
468 | |
469 | /* | |
470 | * Ok, go for it.. | |
471 | */ | |
1b42f516 IM |
472 | idx0 = FIX_BTMAP_BEGIN - NR_FIX_BTMAPS*nesting; |
473 | idx = idx0; | |
1da177e4 | 474 | while (nrpages > 0) { |
beacfaac | 475 | early_set_fixmap(idx, phys_addr); |
1da177e4 LT |
476 | phys_addr += PAGE_SIZE; |
477 | --idx; | |
478 | --nrpages; | |
479 | } | |
d18d6d65 IM |
480 | if (early_ioremap_debug) |
481 | printk(KERN_CONT "%08lx + %08lx\n", offset, fix_to_virt(idx0)); | |
1b42f516 | 482 | |
91eebf40 | 483 | return (void *) (offset + fix_to_virt(idx0)); |
1da177e4 LT |
484 | } |
485 | ||
beacfaac | 486 | void __init early_iounmap(void *addr, unsigned long size) |
1da177e4 LT |
487 | { |
488 | unsigned long virt_addr; | |
489 | unsigned long offset; | |
490 | unsigned int nrpages; | |
491 | enum fixed_addresses idx; | |
1b42f516 IM |
492 | unsigned int nesting; |
493 | ||
494 | nesting = --early_ioremap_nested; | |
bd796ed0 | 495 | WARN_ON(nesting < 0); |
1da177e4 | 496 | |
d18d6d65 | 497 | if (early_ioremap_debug) { |
adafdf6a | 498 | printk(KERN_INFO "early_iounmap(%p, %08lx) [%d]\n", addr, |
91eebf40 | 499 | size, nesting); |
d18d6d65 IM |
500 | dump_stack(); |
501 | } | |
502 | ||
1da177e4 | 503 | virt_addr = (unsigned long)addr; |
bd796ed0 IM |
504 | if (virt_addr < fix_to_virt(FIX_BTMAP_BEGIN)) { |
505 | WARN_ON(1); | |
1da177e4 | 506 | return; |
bd796ed0 | 507 | } |
1da177e4 LT |
508 | offset = virt_addr & ~PAGE_MASK; |
509 | nrpages = PAGE_ALIGN(offset + size - 1) >> PAGE_SHIFT; | |
510 | ||
1b42f516 | 511 | idx = FIX_BTMAP_BEGIN - NR_FIX_BTMAPS*nesting; |
1da177e4 | 512 | while (nrpages > 0) { |
beacfaac | 513 | early_clear_fixmap(idx); |
1da177e4 LT |
514 | --idx; |
515 | --nrpages; | |
516 | } | |
517 | } | |
1b42f516 IM |
518 | |
519 | void __this_fixmap_does_not_exist(void) | |
520 | { | |
521 | WARN_ON(1); | |
522 | } | |
240d3a7c TG |
523 | |
524 | #endif /* CONFIG_X86_32 */ |