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> |
d7677d40 | 22 | #include <asm/pat.h> |
1da177e4 | 23 | |
240d3a7c TG |
24 | #ifdef CONFIG_X86_64 |
25 | ||
26 | unsigned long __phys_addr(unsigned long x) | |
27 | { | |
28 | if (x >= __START_KERNEL_map) | |
29 | return x - __START_KERNEL_map + phys_base; | |
30 | return x - PAGE_OFFSET; | |
31 | } | |
32 | EXPORT_SYMBOL(__phys_addr); | |
33 | ||
e3100c82 TG |
34 | static inline int phys_addr_valid(unsigned long addr) |
35 | { | |
36 | return addr < (1UL << boot_cpu_data.x86_phys_bits); | |
37 | } | |
38 | ||
39 | #else | |
40 | ||
41 | static inline int phys_addr_valid(unsigned long addr) | |
42 | { | |
43 | return 1; | |
44 | } | |
45 | ||
240d3a7c TG |
46 | #endif |
47 | ||
5f5192b9 TG |
48 | int page_is_ram(unsigned long pagenr) |
49 | { | |
756a6c68 | 50 | resource_size_t addr, end; |
5f5192b9 TG |
51 | int i; |
52 | ||
d8a9e6a5 AV |
53 | /* |
54 | * A special case is the first 4Kb of memory; | |
55 | * This is a BIOS owned area, not kernel ram, but generally | |
56 | * not listed as such in the E820 table. | |
57 | */ | |
58 | if (pagenr == 0) | |
59 | return 0; | |
60 | ||
156fbc3f AV |
61 | /* |
62 | * Second special case: Some BIOSen report the PC BIOS | |
63 | * area (640->1Mb) as ram even though it is not. | |
64 | */ | |
65 | if (pagenr >= (BIOS_BEGIN >> PAGE_SHIFT) && | |
66 | pagenr < (BIOS_END >> PAGE_SHIFT)) | |
67 | return 0; | |
d8a9e6a5 | 68 | |
5f5192b9 TG |
69 | for (i = 0; i < e820.nr_map; i++) { |
70 | /* | |
71 | * Not usable memory: | |
72 | */ | |
73 | if (e820.map[i].type != E820_RAM) | |
74 | continue; | |
5f5192b9 TG |
75 | addr = (e820.map[i].addr + PAGE_SIZE-1) >> PAGE_SHIFT; |
76 | end = (e820.map[i].addr + e820.map[i].size) >> PAGE_SHIFT; | |
950f9d95 | 77 | |
950f9d95 | 78 | |
5f5192b9 TG |
79 | if ((pagenr >= addr) && (pagenr < end)) |
80 | return 1; | |
81 | } | |
82 | return 0; | |
83 | } | |
84 | ||
e9332cac TG |
85 | /* |
86 | * Fix up the linear direct mapping of the kernel to avoid cache attribute | |
87 | * conflicts. | |
88 | */ | |
3a96ce8c | 89 | int ioremap_change_attr(unsigned long vaddr, unsigned long size, |
90 | unsigned long prot_val) | |
e9332cac | 91 | { |
d806e5ee | 92 | unsigned long nrpages = size >> PAGE_SHIFT; |
93809be8 | 93 | int err; |
e9332cac | 94 | |
3a96ce8c | 95 | switch (prot_val) { |
96 | case _PAGE_CACHE_UC: | |
d806e5ee | 97 | default: |
1219333d | 98 | err = _set_memory_uc(vaddr, nrpages); |
d806e5ee | 99 | break; |
b310f381 | 100 | case _PAGE_CACHE_WC: |
101 | err = _set_memory_wc(vaddr, nrpages); | |
102 | break; | |
3a96ce8c | 103 | case _PAGE_CACHE_WB: |
1219333d | 104 | err = _set_memory_wb(vaddr, nrpages); |
d806e5ee TG |
105 | break; |
106 | } | |
e9332cac TG |
107 | |
108 | return err; | |
109 | } | |
110 | ||
1da177e4 LT |
111 | /* |
112 | * Remap an arbitrary physical address space into the kernel virtual | |
113 | * address space. Needed when the kernel wants to access high addresses | |
114 | * directly. | |
115 | * | |
116 | * NOTE! We need to allow non-page-aligned mappings too: we will obviously | |
117 | * have to convert them into an offset in a page-aligned mapping, but the | |
118 | * caller shouldn't need to know that small detail. | |
119 | */ | |
23016969 CL |
120 | static void __iomem *__ioremap_caller(resource_size_t phys_addr, |
121 | unsigned long size, unsigned long prot_val, void *caller) | |
1da177e4 | 122 | { |
756a6c68 IM |
123 | unsigned long pfn, offset, vaddr; |
124 | resource_size_t last_addr; | |
91eebf40 | 125 | struct vm_struct *area; |
d7677d40 | 126 | unsigned long new_prot_val; |
d806e5ee | 127 | pgprot_t prot; |
dee7cbb2 | 128 | int retval; |
1da177e4 LT |
129 | |
130 | /* Don't allow wraparound or zero size */ | |
131 | last_addr = phys_addr + size - 1; | |
132 | if (!size || last_addr < phys_addr) | |
133 | return NULL; | |
134 | ||
e3100c82 | 135 | if (!phys_addr_valid(phys_addr)) { |
6997ab49 | 136 | printk(KERN_WARNING "ioremap: invalid physical address %llx\n", |
4c8337ac | 137 | (unsigned long long)phys_addr); |
e3100c82 TG |
138 | WARN_ON_ONCE(1); |
139 | return NULL; | |
140 | } | |
141 | ||
1da177e4 LT |
142 | /* |
143 | * Don't remap the low PCI/ISA area, it's always mapped.. | |
144 | */ | |
bcc643dc | 145 | if (is_ISA_range(phys_addr, last_addr)) |
4b40fcee | 146 | return (__force void __iomem *)phys_to_virt(phys_addr); |
1da177e4 LT |
147 | |
148 | /* | |
149 | * Don't allow anybody to remap normal RAM that we're using.. | |
150 | */ | |
cb8ab687 AS |
151 | for (pfn = phys_addr >> PAGE_SHIFT; |
152 | (pfn << PAGE_SHIFT) < (last_addr & PAGE_MASK); | |
153 | pfn++) { | |
bdd3cee2 | 154 | |
ba748d22 IM |
155 | int is_ram = page_is_ram(pfn); |
156 | ||
157 | if (is_ram && pfn_valid(pfn) && !PageReserved(pfn_to_page(pfn))) | |
266b9f87 | 158 | return NULL; |
ba748d22 | 159 | WARN_ON_ONCE(is_ram); |
1da177e4 LT |
160 | } |
161 | ||
d7677d40 | 162 | /* |
163 | * Mappings have to be page-aligned | |
164 | */ | |
165 | offset = phys_addr & ~PAGE_MASK; | |
166 | phys_addr &= PAGE_MASK; | |
167 | size = PAGE_ALIGN(last_addr+1) - phys_addr; | |
168 | ||
dee7cbb2 VP |
169 | retval = reserve_memtype(phys_addr, phys_addr + size, |
170 | prot_val, &new_prot_val); | |
171 | if (retval) { | |
b450e5e8 | 172 | pr_debug("Warning: reserve_memtype returned %d\n", retval); |
dee7cbb2 VP |
173 | return NULL; |
174 | } | |
175 | ||
176 | if (prot_val != new_prot_val) { | |
d7677d40 | 177 | /* |
178 | * Do not fallback to certain memory types with certain | |
179 | * requested type: | |
de33c442 SS |
180 | * - request is uc-, return cannot be write-back |
181 | * - request is uc-, return cannot be write-combine | |
b310f381 | 182 | * - request is write-combine, return cannot be write-back |
d7677d40 | 183 | */ |
de33c442 | 184 | if ((prot_val == _PAGE_CACHE_UC_MINUS && |
b310f381 | 185 | (new_prot_val == _PAGE_CACHE_WB || |
186 | new_prot_val == _PAGE_CACHE_WC)) || | |
187 | (prot_val == _PAGE_CACHE_WC && | |
d7677d40 | 188 | new_prot_val == _PAGE_CACHE_WB)) { |
b450e5e8 | 189 | pr_debug( |
6997ab49 | 190 | "ioremap error for 0x%llx-0x%llx, requested 0x%lx, got 0x%lx\n", |
4c8337ac RD |
191 | (unsigned long long)phys_addr, |
192 | (unsigned long long)(phys_addr + size), | |
6997ab49 | 193 | prot_val, new_prot_val); |
d7677d40 | 194 | free_memtype(phys_addr, phys_addr + size); |
195 | return NULL; | |
196 | } | |
197 | prot_val = new_prot_val; | |
198 | } | |
199 | ||
3a96ce8c | 200 | switch (prot_val) { |
201 | case _PAGE_CACHE_UC: | |
d806e5ee | 202 | default: |
55c62682 | 203 | prot = PAGE_KERNEL_NOCACHE; |
d806e5ee | 204 | break; |
de33c442 SS |
205 | case _PAGE_CACHE_UC_MINUS: |
206 | prot = PAGE_KERNEL_UC_MINUS; | |
207 | break; | |
b310f381 | 208 | case _PAGE_CACHE_WC: |
209 | prot = PAGE_KERNEL_WC; | |
210 | break; | |
3a96ce8c | 211 | case _PAGE_CACHE_WB: |
d806e5ee TG |
212 | prot = PAGE_KERNEL; |
213 | break; | |
214 | } | |
a148ecfd | 215 | |
1da177e4 LT |
216 | /* |
217 | * Ok, go for it.. | |
218 | */ | |
23016969 | 219 | area = get_vm_area_caller(size, VM_IOREMAP, caller); |
1da177e4 LT |
220 | if (!area) |
221 | return NULL; | |
222 | area->phys_addr = phys_addr; | |
e66aadbe TG |
223 | vaddr = (unsigned long) area->addr; |
224 | if (ioremap_page_range(vaddr, vaddr + size, phys_addr, prot)) { | |
d7677d40 | 225 | free_memtype(phys_addr, phys_addr + size); |
b16bf712 | 226 | free_vm_area(area); |
1da177e4 LT |
227 | return NULL; |
228 | } | |
e9332cac | 229 | |
3a96ce8c | 230 | if (ioremap_change_attr(vaddr, size, prot_val) < 0) { |
d7677d40 | 231 | free_memtype(phys_addr, phys_addr + size); |
e66aadbe | 232 | vunmap(area->addr); |
e9332cac TG |
233 | return NULL; |
234 | } | |
235 | ||
e66aadbe | 236 | return (void __iomem *) (vaddr + offset); |
1da177e4 | 237 | } |
1da177e4 LT |
238 | |
239 | /** | |
240 | * ioremap_nocache - map bus memory into CPU space | |
241 | * @offset: bus address of the memory | |
242 | * @size: size of the resource to map | |
243 | * | |
244 | * ioremap_nocache performs a platform specific sequence of operations to | |
245 | * make bus memory CPU accessible via the readb/readw/readl/writeb/ | |
246 | * writew/writel functions and the other mmio helpers. The returned | |
247 | * address is not guaranteed to be usable directly as a virtual | |
91eebf40 | 248 | * address. |
1da177e4 LT |
249 | * |
250 | * This version of ioremap ensures that the memory is marked uncachable | |
251 | * on the CPU as well as honouring existing caching rules from things like | |
91eebf40 | 252 | * the PCI bus. Note that there are other caches and buffers on many |
1da177e4 LT |
253 | * busses. In particular driver authors should read up on PCI writes |
254 | * | |
255 | * It's useful if some control registers are in such an area and | |
256 | * write combining or read caching is not desirable: | |
91eebf40 | 257 | * |
1da177e4 LT |
258 | * Must be freed with iounmap. |
259 | */ | |
b9e76a00 | 260 | void __iomem *ioremap_nocache(resource_size_t phys_addr, unsigned long size) |
1da177e4 | 261 | { |
de33c442 SS |
262 | /* |
263 | * Ideally, this should be: | |
499f8f84 | 264 | * pat_enabled ? _PAGE_CACHE_UC : _PAGE_CACHE_UC_MINUS; |
de33c442 SS |
265 | * |
266 | * Till we fix all X drivers to use ioremap_wc(), we will use | |
267 | * UC MINUS. | |
268 | */ | |
269 | unsigned long val = _PAGE_CACHE_UC_MINUS; | |
270 | ||
271 | return __ioremap_caller(phys_addr, size, val, | |
23016969 | 272 | __builtin_return_address(0)); |
1da177e4 | 273 | } |
129f6946 | 274 | EXPORT_SYMBOL(ioremap_nocache); |
1da177e4 | 275 | |
b310f381 | 276 | /** |
277 | * ioremap_wc - map memory into CPU space write combined | |
278 | * @offset: bus address of the memory | |
279 | * @size: size of the resource to map | |
280 | * | |
281 | * This version of ioremap ensures that the memory is marked write combining. | |
282 | * Write combining allows faster writes to some hardware devices. | |
283 | * | |
284 | * Must be freed with iounmap. | |
285 | */ | |
286 | void __iomem *ioremap_wc(unsigned long phys_addr, unsigned long size) | |
287 | { | |
499f8f84 | 288 | if (pat_enabled) |
23016969 CL |
289 | return __ioremap_caller(phys_addr, size, _PAGE_CACHE_WC, |
290 | __builtin_return_address(0)); | |
b310f381 | 291 | else |
292 | return ioremap_nocache(phys_addr, size); | |
293 | } | |
294 | EXPORT_SYMBOL(ioremap_wc); | |
295 | ||
b9e76a00 | 296 | void __iomem *ioremap_cache(resource_size_t phys_addr, unsigned long size) |
5f868152 | 297 | { |
23016969 CL |
298 | return __ioremap_caller(phys_addr, size, _PAGE_CACHE_WB, |
299 | __builtin_return_address(0)); | |
5f868152 TG |
300 | } |
301 | EXPORT_SYMBOL(ioremap_cache); | |
302 | ||
bf5421c3 AK |
303 | /** |
304 | * iounmap - Free a IO remapping | |
305 | * @addr: virtual address from ioremap_* | |
306 | * | |
307 | * Caller must ensure there is only one unmapping for the same pointer. | |
308 | */ | |
1da177e4 LT |
309 | void iounmap(volatile void __iomem *addr) |
310 | { | |
bf5421c3 | 311 | struct vm_struct *p, *o; |
c23a4e96 AM |
312 | |
313 | if ((void __force *)addr <= high_memory) | |
1da177e4 LT |
314 | return; |
315 | ||
316 | /* | |
317 | * __ioremap special-cases the PCI/ISA range by not instantiating a | |
318 | * vm_area and by simply returning an address into the kernel mapping | |
319 | * of ISA space. So handle that here. | |
320 | */ | |
6e92a5a6 TG |
321 | if ((void __force *)addr >= phys_to_virt(ISA_START_ADDRESS) && |
322 | (void __force *)addr < phys_to_virt(ISA_END_ADDRESS)) | |
1da177e4 LT |
323 | return; |
324 | ||
91eebf40 TG |
325 | addr = (volatile void __iomem *) |
326 | (PAGE_MASK & (unsigned long __force)addr); | |
bf5421c3 AK |
327 | |
328 | /* Use the vm area unlocked, assuming the caller | |
329 | ensures there isn't another iounmap for the same address | |
330 | in parallel. Reuse of the virtual address is prevented by | |
331 | leaving it in the global lists until we're done with it. | |
332 | cpa takes care of the direct mappings. */ | |
333 | read_lock(&vmlist_lock); | |
334 | for (p = vmlist; p; p = p->next) { | |
6e92a5a6 | 335 | if (p->addr == (void __force *)addr) |
bf5421c3 AK |
336 | break; |
337 | } | |
338 | read_unlock(&vmlist_lock); | |
339 | ||
340 | if (!p) { | |
91eebf40 | 341 | printk(KERN_ERR "iounmap: bad address %p\n", addr); |
c23a4e96 | 342 | dump_stack(); |
bf5421c3 | 343 | return; |
1da177e4 LT |
344 | } |
345 | ||
d7677d40 | 346 | free_memtype(p->phys_addr, p->phys_addr + get_vm_area_size(p)); |
347 | ||
bf5421c3 | 348 | /* Finally remove it */ |
6e92a5a6 | 349 | o = remove_vm_area((void __force *)addr); |
bf5421c3 | 350 | BUG_ON(p != o || o == NULL); |
91eebf40 | 351 | kfree(p); |
1da177e4 | 352 | } |
129f6946 | 353 | EXPORT_SYMBOL(iounmap); |
1da177e4 | 354 | |
e045fb2a | 355 | /* |
356 | * Convert a physical pointer to a virtual kernel pointer for /dev/mem | |
357 | * access | |
358 | */ | |
359 | void *xlate_dev_mem_ptr(unsigned long phys) | |
360 | { | |
361 | void *addr; | |
362 | unsigned long start = phys & PAGE_MASK; | |
363 | ||
364 | /* If page is RAM, we can use __va. Otherwise ioremap and unmap. */ | |
365 | if (page_is_ram(start >> PAGE_SHIFT)) | |
366 | return __va(phys); | |
367 | ||
6e92a5a6 | 368 | addr = (void __force *)ioremap(start, PAGE_SIZE); |
e045fb2a | 369 | if (addr) |
370 | addr = (void *)((unsigned long)addr | (phys & ~PAGE_MASK)); | |
371 | ||
372 | return addr; | |
373 | } | |
374 | ||
375 | void unxlate_dev_mem_ptr(unsigned long phys, void *addr) | |
376 | { | |
377 | if (page_is_ram(phys >> PAGE_SHIFT)) | |
378 | return; | |
379 | ||
380 | iounmap((void __iomem *)((unsigned long)addr & PAGE_MASK)); | |
381 | return; | |
382 | } | |
383 | ||
d18d6d65 IM |
384 | int __initdata early_ioremap_debug; |
385 | ||
386 | static int __init early_ioremap_debug_setup(char *str) | |
387 | { | |
388 | early_ioremap_debug = 1; | |
389 | ||
793b24a2 | 390 | return 0; |
d18d6d65 | 391 | } |
793b24a2 | 392 | early_param("early_ioremap_debug", early_ioremap_debug_setup); |
d18d6d65 | 393 | |
0947b2f3 | 394 | static __initdata int after_paging_init; |
a7bf0bd5 | 395 | static pte_t bm_pte[PAGE_SIZE/sizeof(pte_t)] __page_aligned_bss; |
0947b2f3 | 396 | |
551889a6 | 397 | static inline pmd_t * __init early_ioremap_pmd(unsigned long addr) |
0947b2f3 | 398 | { |
37cc8d7f JF |
399 | /* Don't assume we're using swapper_pg_dir at this point */ |
400 | pgd_t *base = __va(read_cr3()); | |
401 | pgd_t *pgd = &base[pgd_index(addr)]; | |
551889a6 IC |
402 | pud_t *pud = pud_offset(pgd, addr); |
403 | pmd_t *pmd = pmd_offset(pud, addr); | |
404 | ||
405 | return pmd; | |
0947b2f3 HY |
406 | } |
407 | ||
551889a6 | 408 | static inline pte_t * __init early_ioremap_pte(unsigned long addr) |
0947b2f3 | 409 | { |
551889a6 | 410 | return &bm_pte[pte_index(addr)]; |
0947b2f3 HY |
411 | } |
412 | ||
beacfaac | 413 | void __init early_ioremap_init(void) |
0947b2f3 | 414 | { |
551889a6 | 415 | pmd_t *pmd; |
0947b2f3 | 416 | |
d18d6d65 | 417 | if (early_ioremap_debug) |
adafdf6a | 418 | printk(KERN_INFO "early_ioremap_init()\n"); |
d18d6d65 | 419 | |
551889a6 | 420 | pmd = early_ioremap_pmd(fix_to_virt(FIX_BTMAP_BEGIN)); |
0947b2f3 | 421 | memset(bm_pte, 0, sizeof(bm_pte)); |
b6fbb669 | 422 | pmd_populate_kernel(&init_mm, pmd, bm_pte); |
551889a6 | 423 | |
0e3a9549 | 424 | /* |
551889a6 | 425 | * The boot-ioremap range spans multiple pmds, for which |
0e3a9549 IM |
426 | * we are not prepared: |
427 | */ | |
551889a6 | 428 | if (pmd != early_ioremap_pmd(fix_to_virt(FIX_BTMAP_END))) { |
0e3a9549 | 429 | WARN_ON(1); |
551889a6 IC |
430 | printk(KERN_WARNING "pmd %p != %p\n", |
431 | pmd, early_ioremap_pmd(fix_to_virt(FIX_BTMAP_END))); | |
91eebf40 | 432 | printk(KERN_WARNING "fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n", |
551889a6 | 433 | fix_to_virt(FIX_BTMAP_BEGIN)); |
91eebf40 | 434 | printk(KERN_WARNING "fix_to_virt(FIX_BTMAP_END): %08lx\n", |
551889a6 | 435 | fix_to_virt(FIX_BTMAP_END)); |
91eebf40 TG |
436 | |
437 | printk(KERN_WARNING "FIX_BTMAP_END: %d\n", FIX_BTMAP_END); | |
438 | printk(KERN_WARNING "FIX_BTMAP_BEGIN: %d\n", | |
439 | FIX_BTMAP_BEGIN); | |
0e3a9549 | 440 | } |
0947b2f3 HY |
441 | } |
442 | ||
beacfaac | 443 | void __init early_ioremap_clear(void) |
0947b2f3 | 444 | { |
551889a6 | 445 | pmd_t *pmd; |
0947b2f3 | 446 | |
d18d6d65 | 447 | if (early_ioremap_debug) |
adafdf6a | 448 | printk(KERN_INFO "early_ioremap_clear()\n"); |
d18d6d65 | 449 | |
551889a6 IC |
450 | pmd = early_ioremap_pmd(fix_to_virt(FIX_BTMAP_BEGIN)); |
451 | pmd_clear(pmd); | |
6944a9c8 | 452 | paravirt_release_pte(__pa(bm_pte) >> PAGE_SHIFT); |
0947b2f3 HY |
453 | __flush_tlb_all(); |
454 | } | |
455 | ||
beacfaac | 456 | void __init early_ioremap_reset(void) |
0947b2f3 HY |
457 | { |
458 | enum fixed_addresses idx; | |
551889a6 IC |
459 | unsigned long addr, phys; |
460 | pte_t *pte; | |
0947b2f3 HY |
461 | |
462 | after_paging_init = 1; | |
64a8f852 | 463 | for (idx = FIX_BTMAP_BEGIN; idx >= FIX_BTMAP_END; idx--) { |
0947b2f3 | 464 | addr = fix_to_virt(idx); |
beacfaac | 465 | pte = early_ioremap_pte(addr); |
551889a6 IC |
466 | if (pte_present(*pte)) { |
467 | phys = pte_val(*pte) & PAGE_MASK; | |
0947b2f3 HY |
468 | set_fixmap(idx, phys); |
469 | } | |
470 | } | |
471 | } | |
472 | ||
beacfaac | 473 | static void __init __early_set_fixmap(enum fixed_addresses idx, |
0947b2f3 HY |
474 | unsigned long phys, pgprot_t flags) |
475 | { | |
551889a6 IC |
476 | unsigned long addr = __fix_to_virt(idx); |
477 | pte_t *pte; | |
0947b2f3 HY |
478 | |
479 | if (idx >= __end_of_fixed_addresses) { | |
480 | BUG(); | |
481 | return; | |
482 | } | |
beacfaac | 483 | pte = early_ioremap_pte(addr); |
4583ed51 | 484 | |
0947b2f3 | 485 | if (pgprot_val(flags)) |
551889a6 | 486 | set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, flags)); |
0947b2f3 | 487 | else |
551889a6 | 488 | pte_clear(NULL, addr, pte); |
0947b2f3 HY |
489 | __flush_tlb_one(addr); |
490 | } | |
491 | ||
beacfaac | 492 | static inline void __init early_set_fixmap(enum fixed_addresses idx, |
0947b2f3 HY |
493 | unsigned long phys) |
494 | { | |
495 | if (after_paging_init) | |
496 | set_fixmap(idx, phys); | |
497 | else | |
beacfaac | 498 | __early_set_fixmap(idx, phys, PAGE_KERNEL); |
0947b2f3 HY |
499 | } |
500 | ||
beacfaac | 501 | static inline void __init early_clear_fixmap(enum fixed_addresses idx) |
0947b2f3 HY |
502 | { |
503 | if (after_paging_init) | |
504 | clear_fixmap(idx); | |
505 | else | |
beacfaac | 506 | __early_set_fixmap(idx, 0, __pgprot(0)); |
0947b2f3 HY |
507 | } |
508 | ||
1b42f516 IM |
509 | |
510 | int __initdata early_ioremap_nested; | |
511 | ||
d690b2af IM |
512 | static int __init check_early_ioremap_leak(void) |
513 | { | |
514 | if (!early_ioremap_nested) | |
515 | return 0; | |
516 | ||
517 | printk(KERN_WARNING | |
91eebf40 TG |
518 | "Debug warning: early ioremap leak of %d areas detected.\n", |
519 | early_ioremap_nested); | |
d690b2af | 520 | printk(KERN_WARNING |
91eebf40 | 521 | "please boot with early_ioremap_debug and report the dmesg.\n"); |
d690b2af IM |
522 | WARN_ON(1); |
523 | ||
524 | return 1; | |
525 | } | |
526 | late_initcall(check_early_ioremap_leak); | |
527 | ||
beacfaac | 528 | void __init *early_ioremap(unsigned long phys_addr, unsigned long size) |
1da177e4 LT |
529 | { |
530 | unsigned long offset, last_addr; | |
1b42f516 IM |
531 | unsigned int nrpages, nesting; |
532 | enum fixed_addresses idx0, idx; | |
533 | ||
534 | WARN_ON(system_state != SYSTEM_BOOTING); | |
535 | ||
536 | nesting = early_ioremap_nested; | |
d18d6d65 | 537 | if (early_ioremap_debug) { |
adafdf6a | 538 | printk(KERN_INFO "early_ioremap(%08lx, %08lx) [%d] => ", |
91eebf40 | 539 | phys_addr, size, nesting); |
d18d6d65 IM |
540 | dump_stack(); |
541 | } | |
1da177e4 LT |
542 | |
543 | /* Don't allow wraparound or zero size */ | |
544 | last_addr = phys_addr + size - 1; | |
bd796ed0 IM |
545 | if (!size || last_addr < phys_addr) { |
546 | WARN_ON(1); | |
1da177e4 | 547 | return NULL; |
bd796ed0 | 548 | } |
1da177e4 | 549 | |
bd796ed0 IM |
550 | if (nesting >= FIX_BTMAPS_NESTING) { |
551 | WARN_ON(1); | |
1b42f516 | 552 | return NULL; |
bd796ed0 | 553 | } |
1b42f516 | 554 | early_ioremap_nested++; |
1da177e4 LT |
555 | /* |
556 | * Mappings have to be page-aligned | |
557 | */ | |
558 | offset = phys_addr & ~PAGE_MASK; | |
559 | phys_addr &= PAGE_MASK; | |
560 | size = PAGE_ALIGN(last_addr) - phys_addr; | |
561 | ||
562 | /* | |
563 | * Mappings have to fit in the FIX_BTMAP area. | |
564 | */ | |
565 | nrpages = size >> PAGE_SHIFT; | |
bd796ed0 IM |
566 | if (nrpages > NR_FIX_BTMAPS) { |
567 | WARN_ON(1); | |
1da177e4 | 568 | return NULL; |
bd796ed0 | 569 | } |
1da177e4 LT |
570 | |
571 | /* | |
572 | * Ok, go for it.. | |
573 | */ | |
1b42f516 IM |
574 | idx0 = FIX_BTMAP_BEGIN - NR_FIX_BTMAPS*nesting; |
575 | idx = idx0; | |
1da177e4 | 576 | while (nrpages > 0) { |
beacfaac | 577 | early_set_fixmap(idx, phys_addr); |
1da177e4 LT |
578 | phys_addr += PAGE_SIZE; |
579 | --idx; | |
580 | --nrpages; | |
581 | } | |
d18d6d65 IM |
582 | if (early_ioremap_debug) |
583 | printk(KERN_CONT "%08lx + %08lx\n", offset, fix_to_virt(idx0)); | |
1b42f516 | 584 | |
91eebf40 | 585 | return (void *) (offset + fix_to_virt(idx0)); |
1da177e4 LT |
586 | } |
587 | ||
beacfaac | 588 | void __init early_iounmap(void *addr, unsigned long size) |
1da177e4 LT |
589 | { |
590 | unsigned long virt_addr; | |
591 | unsigned long offset; | |
592 | unsigned int nrpages; | |
593 | enum fixed_addresses idx; | |
226e9a93 | 594 | int nesting; |
1b42f516 IM |
595 | |
596 | nesting = --early_ioremap_nested; | |
226e9a93 IM |
597 | if (WARN_ON(nesting < 0)) |
598 | return; | |
1da177e4 | 599 | |
d18d6d65 | 600 | if (early_ioremap_debug) { |
adafdf6a | 601 | printk(KERN_INFO "early_iounmap(%p, %08lx) [%d]\n", addr, |
91eebf40 | 602 | size, nesting); |
d18d6d65 IM |
603 | dump_stack(); |
604 | } | |
605 | ||
1da177e4 | 606 | virt_addr = (unsigned long)addr; |
bd796ed0 IM |
607 | if (virt_addr < fix_to_virt(FIX_BTMAP_BEGIN)) { |
608 | WARN_ON(1); | |
1da177e4 | 609 | return; |
bd796ed0 | 610 | } |
1da177e4 LT |
611 | offset = virt_addr & ~PAGE_MASK; |
612 | nrpages = PAGE_ALIGN(offset + size - 1) >> PAGE_SHIFT; | |
613 | ||
1b42f516 | 614 | idx = FIX_BTMAP_BEGIN - NR_FIX_BTMAPS*nesting; |
1da177e4 | 615 | while (nrpages > 0) { |
beacfaac | 616 | early_clear_fixmap(idx); |
1da177e4 LT |
617 | --idx; |
618 | --nrpages; | |
619 | } | |
620 | } | |
1b42f516 IM |
621 | |
622 | void __this_fixmap_does_not_exist(void) | |
623 | { | |
624 | WARN_ON(1); | |
625 | } |