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 | ||
38 | #endif | |
39 | ||
5f5192b9 TG |
40 | int page_is_ram(unsigned long pagenr) |
41 | { | |
42 | unsigned long addr, end; | |
43 | int i; | |
44 | ||
d8a9e6a5 AV |
45 | /* |
46 | * A special case is the first 4Kb of memory; | |
47 | * This is a BIOS owned area, not kernel ram, but generally | |
48 | * not listed as such in the E820 table. | |
49 | */ | |
50 | if (pagenr == 0) | |
51 | return 0; | |
52 | ||
156fbc3f AV |
53 | /* |
54 | * Second special case: Some BIOSen report the PC BIOS | |
55 | * area (640->1Mb) as ram even though it is not. | |
56 | */ | |
57 | if (pagenr >= (BIOS_BEGIN >> PAGE_SHIFT) && | |
58 | pagenr < (BIOS_END >> PAGE_SHIFT)) | |
59 | return 0; | |
d8a9e6a5 | 60 | |
5f5192b9 TG |
61 | for (i = 0; i < e820.nr_map; i++) { |
62 | /* | |
63 | * Not usable memory: | |
64 | */ | |
65 | if (e820.map[i].type != E820_RAM) | |
66 | continue; | |
5f5192b9 TG |
67 | addr = (e820.map[i].addr + PAGE_SIZE-1) >> PAGE_SHIFT; |
68 | end = (e820.map[i].addr + e820.map[i].size) >> PAGE_SHIFT; | |
950f9d95 | 69 | |
950f9d95 | 70 | |
5f5192b9 TG |
71 | if ((pagenr >= addr) && (pagenr < end)) |
72 | return 1; | |
73 | } | |
74 | return 0; | |
75 | } | |
76 | ||
e9332cac TG |
77 | /* |
78 | * Fix up the linear direct mapping of the kernel to avoid cache attribute | |
79 | * conflicts. | |
80 | */ | |
75ab43bf | 81 | static int ioremap_change_attr(unsigned long vaddr, unsigned long size, |
d806e5ee | 82 | enum ioremap_mode mode) |
e9332cac | 83 | { |
d806e5ee | 84 | unsigned long nrpages = size >> PAGE_SHIFT; |
93809be8 | 85 | int err; |
e9332cac | 86 | |
d806e5ee TG |
87 | switch (mode) { |
88 | case IOR_MODE_UNCACHED: | |
89 | default: | |
90 | err = set_memory_uc(vaddr, nrpages); | |
91 | break; | |
92 | case IOR_MODE_CACHED: | |
93 | err = set_memory_wb(vaddr, nrpages); | |
94 | break; | |
95 | } | |
e9332cac TG |
96 | |
97 | return err; | |
98 | } | |
99 | ||
1da177e4 LT |
100 | /* |
101 | * Remap an arbitrary physical address space into the kernel virtual | |
102 | * address space. Needed when the kernel wants to access high addresses | |
103 | * directly. | |
104 | * | |
105 | * NOTE! We need to allow non-page-aligned mappings too: we will obviously | |
106 | * have to convert them into an offset in a page-aligned mapping, but the | |
107 | * caller shouldn't need to know that small detail. | |
108 | */ | |
b9e76a00 | 109 | static void __iomem *__ioremap(resource_size_t phys_addr, unsigned long size, |
d806e5ee | 110 | enum ioremap_mode mode) |
1da177e4 | 111 | { |
e66aadbe | 112 | unsigned long pfn, offset, last_addr, vaddr; |
91eebf40 | 113 | struct vm_struct *area; |
d806e5ee | 114 | pgprot_t prot; |
1da177e4 LT |
115 | |
116 | /* Don't allow wraparound or zero size */ | |
117 | last_addr = phys_addr + size - 1; | |
118 | if (!size || last_addr < phys_addr) | |
119 | return NULL; | |
120 | ||
121 | /* | |
122 | * Don't remap the low PCI/ISA area, it's always mapped.. | |
123 | */ | |
124 | if (phys_addr >= ISA_START_ADDRESS && last_addr < ISA_END_ADDRESS) | |
4b40fcee | 125 | return (__force void __iomem *)phys_to_virt(phys_addr); |
1da177e4 LT |
126 | |
127 | /* | |
128 | * Don't allow anybody to remap normal RAM that we're using.. | |
129 | */ | |
38cb47ba IM |
130 | for (pfn = phys_addr >> PAGE_SHIFT; pfn < max_pfn_mapped && |
131 | (pfn << PAGE_SHIFT) < last_addr; pfn++) { | |
132 | if (page_is_ram(pfn) && pfn_valid(pfn) && | |
133 | !PageReserved(pfn_to_page(pfn))) | |
266b9f87 | 134 | return NULL; |
1da177e4 LT |
135 | } |
136 | ||
d806e5ee TG |
137 | switch (mode) { |
138 | case IOR_MODE_UNCACHED: | |
139 | default: | |
d546b67a SS |
140 | /* |
141 | * FIXME: we will use UC MINUS for now, as video fb drivers | |
142 | * depend on it. Upcoming ioremap_wc() will fix this behavior. | |
143 | */ | |
144 | prot = PAGE_KERNEL_UC_MINUS; | |
d806e5ee TG |
145 | break; |
146 | case IOR_MODE_CACHED: | |
147 | prot = PAGE_KERNEL; | |
148 | break; | |
149 | } | |
a148ecfd | 150 | |
1da177e4 LT |
151 | /* |
152 | * Mappings have to be page-aligned | |
153 | */ | |
154 | offset = phys_addr & ~PAGE_MASK; | |
155 | phys_addr &= PAGE_MASK; | |
156 | size = PAGE_ALIGN(last_addr+1) - phys_addr; | |
157 | ||
158 | /* | |
159 | * Ok, go for it.. | |
160 | */ | |
74ff2857 | 161 | area = get_vm_area(size, VM_IOREMAP); |
1da177e4 LT |
162 | if (!area) |
163 | return NULL; | |
164 | area->phys_addr = phys_addr; | |
e66aadbe TG |
165 | vaddr = (unsigned long) area->addr; |
166 | if (ioremap_page_range(vaddr, vaddr + size, phys_addr, prot)) { | |
b16bf712 | 167 | free_vm_area(area); |
1da177e4 LT |
168 | return NULL; |
169 | } | |
e9332cac | 170 | |
75ab43bf | 171 | if (ioremap_change_attr(vaddr, size, mode) < 0) { |
e66aadbe | 172 | vunmap(area->addr); |
e9332cac TG |
173 | return NULL; |
174 | } | |
175 | ||
e66aadbe | 176 | return (void __iomem *) (vaddr + offset); |
1da177e4 | 177 | } |
1da177e4 LT |
178 | |
179 | /** | |
180 | * ioremap_nocache - map bus memory into CPU space | |
181 | * @offset: bus address of the memory | |
182 | * @size: size of the resource to map | |
183 | * | |
184 | * ioremap_nocache performs a platform specific sequence of operations to | |
185 | * make bus memory CPU accessible via the readb/readw/readl/writeb/ | |
186 | * writew/writel functions and the other mmio helpers. The returned | |
187 | * address is not guaranteed to be usable directly as a virtual | |
91eebf40 | 188 | * address. |
1da177e4 LT |
189 | * |
190 | * This version of ioremap ensures that the memory is marked uncachable | |
191 | * on the CPU as well as honouring existing caching rules from things like | |
91eebf40 | 192 | * the PCI bus. Note that there are other caches and buffers on many |
1da177e4 LT |
193 | * busses. In particular driver authors should read up on PCI writes |
194 | * | |
195 | * It's useful if some control registers are in such an area and | |
196 | * write combining or read caching is not desirable: | |
91eebf40 | 197 | * |
1da177e4 LT |
198 | * Must be freed with iounmap. |
199 | */ | |
b9e76a00 | 200 | void __iomem *ioremap_nocache(resource_size_t phys_addr, unsigned long size) |
1da177e4 | 201 | { |
d806e5ee | 202 | return __ioremap(phys_addr, size, IOR_MODE_UNCACHED); |
1da177e4 | 203 | } |
129f6946 | 204 | EXPORT_SYMBOL(ioremap_nocache); |
1da177e4 | 205 | |
b9e76a00 | 206 | void __iomem *ioremap_cache(resource_size_t phys_addr, unsigned long size) |
5f868152 | 207 | { |
d806e5ee | 208 | return __ioremap(phys_addr, size, IOR_MODE_CACHED); |
5f868152 TG |
209 | } |
210 | EXPORT_SYMBOL(ioremap_cache); | |
211 | ||
bf5421c3 AK |
212 | /** |
213 | * iounmap - Free a IO remapping | |
214 | * @addr: virtual address from ioremap_* | |
215 | * | |
216 | * Caller must ensure there is only one unmapping for the same pointer. | |
217 | */ | |
1da177e4 LT |
218 | void iounmap(volatile void __iomem *addr) |
219 | { | |
bf5421c3 | 220 | struct vm_struct *p, *o; |
c23a4e96 AM |
221 | |
222 | if ((void __force *)addr <= high_memory) | |
1da177e4 LT |
223 | return; |
224 | ||
225 | /* | |
226 | * __ioremap special-cases the PCI/ISA range by not instantiating a | |
227 | * vm_area and by simply returning an address into the kernel mapping | |
228 | * of ISA space. So handle that here. | |
229 | */ | |
230 | if (addr >= phys_to_virt(ISA_START_ADDRESS) && | |
91eebf40 | 231 | addr < phys_to_virt(ISA_END_ADDRESS)) |
1da177e4 LT |
232 | return; |
233 | ||
91eebf40 TG |
234 | addr = (volatile void __iomem *) |
235 | (PAGE_MASK & (unsigned long __force)addr); | |
bf5421c3 AK |
236 | |
237 | /* Use the vm area unlocked, assuming the caller | |
238 | ensures there isn't another iounmap for the same address | |
239 | in parallel. Reuse of the virtual address is prevented by | |
240 | leaving it in the global lists until we're done with it. | |
241 | cpa takes care of the direct mappings. */ | |
242 | read_lock(&vmlist_lock); | |
243 | for (p = vmlist; p; p = p->next) { | |
244 | if (p->addr == addr) | |
245 | break; | |
246 | } | |
247 | read_unlock(&vmlist_lock); | |
248 | ||
249 | if (!p) { | |
91eebf40 | 250 | printk(KERN_ERR "iounmap: bad address %p\n", addr); |
c23a4e96 | 251 | dump_stack(); |
bf5421c3 | 252 | return; |
1da177e4 LT |
253 | } |
254 | ||
bf5421c3 AK |
255 | /* Finally remove it */ |
256 | o = remove_vm_area((void *)addr); | |
257 | BUG_ON(p != o || o == NULL); | |
91eebf40 | 258 | kfree(p); |
1da177e4 | 259 | } |
129f6946 | 260 | EXPORT_SYMBOL(iounmap); |
1da177e4 | 261 | |
240d3a7c | 262 | #ifdef CONFIG_X86_32 |
d18d6d65 IM |
263 | |
264 | int __initdata early_ioremap_debug; | |
265 | ||
266 | static int __init early_ioremap_debug_setup(char *str) | |
267 | { | |
268 | early_ioremap_debug = 1; | |
269 | ||
793b24a2 | 270 | return 0; |
d18d6d65 | 271 | } |
793b24a2 | 272 | early_param("early_ioremap_debug", early_ioremap_debug_setup); |
d18d6d65 | 273 | |
0947b2f3 | 274 | static __initdata int after_paging_init; |
c92a7a54 IC |
275 | static pte_t bm_pte[PAGE_SIZE/sizeof(pte_t)] |
276 | __section(.bss.page_aligned); | |
0947b2f3 | 277 | |
551889a6 | 278 | static inline pmd_t * __init early_ioremap_pmd(unsigned long addr) |
0947b2f3 | 279 | { |
37cc8d7f JF |
280 | /* Don't assume we're using swapper_pg_dir at this point */ |
281 | pgd_t *base = __va(read_cr3()); | |
282 | pgd_t *pgd = &base[pgd_index(addr)]; | |
551889a6 IC |
283 | pud_t *pud = pud_offset(pgd, addr); |
284 | pmd_t *pmd = pmd_offset(pud, addr); | |
285 | ||
286 | return pmd; | |
0947b2f3 HY |
287 | } |
288 | ||
551889a6 | 289 | static inline pte_t * __init early_ioremap_pte(unsigned long addr) |
0947b2f3 | 290 | { |
551889a6 | 291 | return &bm_pte[pte_index(addr)]; |
0947b2f3 HY |
292 | } |
293 | ||
beacfaac | 294 | void __init early_ioremap_init(void) |
0947b2f3 | 295 | { |
551889a6 | 296 | pmd_t *pmd; |
0947b2f3 | 297 | |
d18d6d65 | 298 | if (early_ioremap_debug) |
adafdf6a | 299 | printk(KERN_INFO "early_ioremap_init()\n"); |
d18d6d65 | 300 | |
551889a6 | 301 | pmd = early_ioremap_pmd(fix_to_virt(FIX_BTMAP_BEGIN)); |
0947b2f3 | 302 | memset(bm_pte, 0, sizeof(bm_pte)); |
b6fbb669 | 303 | pmd_populate_kernel(&init_mm, pmd, bm_pte); |
551889a6 | 304 | |
0e3a9549 | 305 | /* |
551889a6 | 306 | * The boot-ioremap range spans multiple pmds, for which |
0e3a9549 IM |
307 | * we are not prepared: |
308 | */ | |
551889a6 | 309 | if (pmd != early_ioremap_pmd(fix_to_virt(FIX_BTMAP_END))) { |
0e3a9549 | 310 | WARN_ON(1); |
551889a6 IC |
311 | printk(KERN_WARNING "pmd %p != %p\n", |
312 | pmd, early_ioremap_pmd(fix_to_virt(FIX_BTMAP_END))); | |
91eebf40 | 313 | printk(KERN_WARNING "fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n", |
551889a6 | 314 | fix_to_virt(FIX_BTMAP_BEGIN)); |
91eebf40 | 315 | printk(KERN_WARNING "fix_to_virt(FIX_BTMAP_END): %08lx\n", |
551889a6 | 316 | fix_to_virt(FIX_BTMAP_END)); |
91eebf40 TG |
317 | |
318 | printk(KERN_WARNING "FIX_BTMAP_END: %d\n", FIX_BTMAP_END); | |
319 | printk(KERN_WARNING "FIX_BTMAP_BEGIN: %d\n", | |
320 | FIX_BTMAP_BEGIN); | |
0e3a9549 | 321 | } |
0947b2f3 HY |
322 | } |
323 | ||
beacfaac | 324 | void __init early_ioremap_clear(void) |
0947b2f3 | 325 | { |
551889a6 | 326 | pmd_t *pmd; |
0947b2f3 | 327 | |
d18d6d65 | 328 | if (early_ioremap_debug) |
adafdf6a | 329 | printk(KERN_INFO "early_ioremap_clear()\n"); |
d18d6d65 | 330 | |
551889a6 IC |
331 | pmd = early_ioremap_pmd(fix_to_virt(FIX_BTMAP_BEGIN)); |
332 | pmd_clear(pmd); | |
b6fbb669 | 333 | paravirt_release_pt(__pa(bm_pte) >> PAGE_SHIFT); |
0947b2f3 HY |
334 | __flush_tlb_all(); |
335 | } | |
336 | ||
beacfaac | 337 | void __init early_ioremap_reset(void) |
0947b2f3 HY |
338 | { |
339 | enum fixed_addresses idx; | |
551889a6 IC |
340 | unsigned long addr, phys; |
341 | pte_t *pte; | |
0947b2f3 HY |
342 | |
343 | after_paging_init = 1; | |
64a8f852 | 344 | for (idx = FIX_BTMAP_BEGIN; idx >= FIX_BTMAP_END; idx--) { |
0947b2f3 | 345 | addr = fix_to_virt(idx); |
beacfaac | 346 | pte = early_ioremap_pte(addr); |
551889a6 IC |
347 | if (pte_present(*pte)) { |
348 | phys = pte_val(*pte) & PAGE_MASK; | |
0947b2f3 HY |
349 | set_fixmap(idx, phys); |
350 | } | |
351 | } | |
352 | } | |
353 | ||
beacfaac | 354 | static void __init __early_set_fixmap(enum fixed_addresses idx, |
0947b2f3 HY |
355 | unsigned long phys, pgprot_t flags) |
356 | { | |
551889a6 IC |
357 | unsigned long addr = __fix_to_virt(idx); |
358 | pte_t *pte; | |
0947b2f3 HY |
359 | |
360 | if (idx >= __end_of_fixed_addresses) { | |
361 | BUG(); | |
362 | return; | |
363 | } | |
beacfaac | 364 | pte = early_ioremap_pte(addr); |
0947b2f3 | 365 | if (pgprot_val(flags)) |
551889a6 | 366 | set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, flags)); |
0947b2f3 | 367 | else |
551889a6 | 368 | pte_clear(NULL, addr, pte); |
0947b2f3 HY |
369 | __flush_tlb_one(addr); |
370 | } | |
371 | ||
beacfaac | 372 | static inline void __init early_set_fixmap(enum fixed_addresses idx, |
0947b2f3 HY |
373 | unsigned long phys) |
374 | { | |
375 | if (after_paging_init) | |
376 | set_fixmap(idx, phys); | |
377 | else | |
beacfaac | 378 | __early_set_fixmap(idx, phys, PAGE_KERNEL); |
0947b2f3 HY |
379 | } |
380 | ||
beacfaac | 381 | static inline void __init early_clear_fixmap(enum fixed_addresses idx) |
0947b2f3 HY |
382 | { |
383 | if (after_paging_init) | |
384 | clear_fixmap(idx); | |
385 | else | |
beacfaac | 386 | __early_set_fixmap(idx, 0, __pgprot(0)); |
0947b2f3 HY |
387 | } |
388 | ||
1b42f516 IM |
389 | |
390 | int __initdata early_ioremap_nested; | |
391 | ||
d690b2af IM |
392 | static int __init check_early_ioremap_leak(void) |
393 | { | |
394 | if (!early_ioremap_nested) | |
395 | return 0; | |
396 | ||
397 | printk(KERN_WARNING | |
91eebf40 TG |
398 | "Debug warning: early ioremap leak of %d areas detected.\n", |
399 | early_ioremap_nested); | |
d690b2af | 400 | printk(KERN_WARNING |
91eebf40 | 401 | "please boot with early_ioremap_debug and report the dmesg.\n"); |
d690b2af IM |
402 | WARN_ON(1); |
403 | ||
404 | return 1; | |
405 | } | |
406 | late_initcall(check_early_ioremap_leak); | |
407 | ||
beacfaac | 408 | void __init *early_ioremap(unsigned long phys_addr, unsigned long size) |
1da177e4 LT |
409 | { |
410 | unsigned long offset, last_addr; | |
1b42f516 IM |
411 | unsigned int nrpages, nesting; |
412 | enum fixed_addresses idx0, idx; | |
413 | ||
414 | WARN_ON(system_state != SYSTEM_BOOTING); | |
415 | ||
416 | nesting = early_ioremap_nested; | |
d18d6d65 | 417 | if (early_ioremap_debug) { |
adafdf6a | 418 | printk(KERN_INFO "early_ioremap(%08lx, %08lx) [%d] => ", |
91eebf40 | 419 | phys_addr, size, nesting); |
d18d6d65 IM |
420 | dump_stack(); |
421 | } | |
1da177e4 LT |
422 | |
423 | /* Don't allow wraparound or zero size */ | |
424 | last_addr = phys_addr + size - 1; | |
bd796ed0 IM |
425 | if (!size || last_addr < phys_addr) { |
426 | WARN_ON(1); | |
1da177e4 | 427 | return NULL; |
bd796ed0 | 428 | } |
1da177e4 | 429 | |
bd796ed0 IM |
430 | if (nesting >= FIX_BTMAPS_NESTING) { |
431 | WARN_ON(1); | |
1b42f516 | 432 | return NULL; |
bd796ed0 | 433 | } |
1b42f516 | 434 | early_ioremap_nested++; |
1da177e4 LT |
435 | /* |
436 | * Mappings have to be page-aligned | |
437 | */ | |
438 | offset = phys_addr & ~PAGE_MASK; | |
439 | phys_addr &= PAGE_MASK; | |
440 | size = PAGE_ALIGN(last_addr) - phys_addr; | |
441 | ||
442 | /* | |
443 | * Mappings have to fit in the FIX_BTMAP area. | |
444 | */ | |
445 | nrpages = size >> PAGE_SHIFT; | |
bd796ed0 IM |
446 | if (nrpages > NR_FIX_BTMAPS) { |
447 | WARN_ON(1); | |
1da177e4 | 448 | return NULL; |
bd796ed0 | 449 | } |
1da177e4 LT |
450 | |
451 | /* | |
452 | * Ok, go for it.. | |
453 | */ | |
1b42f516 IM |
454 | idx0 = FIX_BTMAP_BEGIN - NR_FIX_BTMAPS*nesting; |
455 | idx = idx0; | |
1da177e4 | 456 | while (nrpages > 0) { |
beacfaac | 457 | early_set_fixmap(idx, phys_addr); |
1da177e4 LT |
458 | phys_addr += PAGE_SIZE; |
459 | --idx; | |
460 | --nrpages; | |
461 | } | |
d18d6d65 IM |
462 | if (early_ioremap_debug) |
463 | printk(KERN_CONT "%08lx + %08lx\n", offset, fix_to_virt(idx0)); | |
1b42f516 | 464 | |
91eebf40 | 465 | return (void *) (offset + fix_to_virt(idx0)); |
1da177e4 LT |
466 | } |
467 | ||
beacfaac | 468 | void __init early_iounmap(void *addr, unsigned long size) |
1da177e4 LT |
469 | { |
470 | unsigned long virt_addr; | |
471 | unsigned long offset; | |
472 | unsigned int nrpages; | |
473 | enum fixed_addresses idx; | |
1b42f516 IM |
474 | unsigned int nesting; |
475 | ||
476 | nesting = --early_ioremap_nested; | |
bd796ed0 | 477 | WARN_ON(nesting < 0); |
1da177e4 | 478 | |
d18d6d65 | 479 | if (early_ioremap_debug) { |
adafdf6a | 480 | printk(KERN_INFO "early_iounmap(%p, %08lx) [%d]\n", addr, |
91eebf40 | 481 | size, nesting); |
d18d6d65 IM |
482 | dump_stack(); |
483 | } | |
484 | ||
1da177e4 | 485 | virt_addr = (unsigned long)addr; |
bd796ed0 IM |
486 | if (virt_addr < fix_to_virt(FIX_BTMAP_BEGIN)) { |
487 | WARN_ON(1); | |
1da177e4 | 488 | return; |
bd796ed0 | 489 | } |
1da177e4 LT |
490 | offset = virt_addr & ~PAGE_MASK; |
491 | nrpages = PAGE_ALIGN(offset + size - 1) >> PAGE_SHIFT; | |
492 | ||
1b42f516 | 493 | idx = FIX_BTMAP_BEGIN - NR_FIX_BTMAPS*nesting; |
1da177e4 | 494 | while (nrpages > 0) { |
beacfaac | 495 | early_clear_fixmap(idx); |
1da177e4 LT |
496 | --idx; |
497 | --nrpages; | |
498 | } | |
499 | } | |
1b42f516 IM |
500 | |
501 | void __this_fixmap_does_not_exist(void) | |
502 | { | |
503 | WARN_ON(1); | |
504 | } | |
240d3a7c TG |
505 | |
506 | #endif /* CONFIG_X86_32 */ |