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> | |
d61fc448 | 15 | #include <linux/mmiotrace.h> |
3cbd09e4 | 16 | |
1da177e4 | 17 | #include <asm/cacheflush.h> |
3cbd09e4 TG |
18 | #include <asm/e820.h> |
19 | #include <asm/fixmap.h> | |
1da177e4 | 20 | #include <asm/pgtable.h> |
3cbd09e4 | 21 | #include <asm/tlbflush.h> |
f6df72e7 | 22 | #include <asm/pgalloc.h> |
d7677d40 | 23 | #include <asm/pat.h> |
1da177e4 | 24 | |
240d3a7c TG |
25 | #ifdef CONFIG_X86_64 |
26 | ||
59ea7463 | 27 | static inline int phys_addr_valid(unsigned long addr) |
240d3a7c | 28 | { |
59ea7463 | 29 | return addr < (1UL << boot_cpu_data.x86_phys_bits); |
240d3a7c | 30 | } |
240d3a7c | 31 | |
59ea7463 | 32 | unsigned long __phys_addr(unsigned long x) |
e3100c82 | 33 | { |
59ea7463 JS |
34 | if (x >= __START_KERNEL_map) { |
35 | x -= __START_KERNEL_map; | |
36 | VIRTUAL_BUG_ON(x >= KERNEL_IMAGE_SIZE); | |
37 | x += phys_base; | |
38 | } else { | |
39 | VIRTUAL_BUG_ON(x < PAGE_OFFSET); | |
40 | x -= PAGE_OFFSET; | |
41 | VIRTUAL_BUG_ON(system_state == SYSTEM_BOOTING ? x > MAXMEM : | |
42 | !phys_addr_valid(x)); | |
43 | } | |
44 | return x; | |
e3100c82 | 45 | } |
59ea7463 | 46 | EXPORT_SYMBOL(__phys_addr); |
e3100c82 TG |
47 | |
48 | #else | |
49 | ||
50 | static inline int phys_addr_valid(unsigned long addr) | |
51 | { | |
52 | return 1; | |
53 | } | |
54 | ||
a1bf9631 | 55 | #ifdef CONFIG_DEBUG_VIRTUAL |
59ea7463 JS |
56 | unsigned long __phys_addr(unsigned long x) |
57 | { | |
58 | /* VMALLOC_* aren't constants; not available at the boot time */ | |
59 | VIRTUAL_BUG_ON(x < PAGE_OFFSET || (system_state != SYSTEM_BOOTING && | |
60 | is_vmalloc_addr((void *)x))); | |
61 | return x - PAGE_OFFSET; | |
62 | } | |
63 | EXPORT_SYMBOL(__phys_addr); | |
a1bf9631 | 64 | #endif |
59ea7463 | 65 | |
240d3a7c TG |
66 | #endif |
67 | ||
5f5192b9 TG |
68 | int page_is_ram(unsigned long pagenr) |
69 | { | |
756a6c68 | 70 | resource_size_t addr, end; |
5f5192b9 TG |
71 | int i; |
72 | ||
d8a9e6a5 AV |
73 | /* |
74 | * A special case is the first 4Kb of memory; | |
75 | * This is a BIOS owned area, not kernel ram, but generally | |
76 | * not listed as such in the E820 table. | |
77 | */ | |
78 | if (pagenr == 0) | |
79 | return 0; | |
80 | ||
156fbc3f AV |
81 | /* |
82 | * Second special case: Some BIOSen report the PC BIOS | |
83 | * area (640->1Mb) as ram even though it is not. | |
84 | */ | |
85 | if (pagenr >= (BIOS_BEGIN >> PAGE_SHIFT) && | |
86 | pagenr < (BIOS_END >> PAGE_SHIFT)) | |
87 | return 0; | |
d8a9e6a5 | 88 | |
5f5192b9 TG |
89 | for (i = 0; i < e820.nr_map; i++) { |
90 | /* | |
91 | * Not usable memory: | |
92 | */ | |
93 | if (e820.map[i].type != E820_RAM) | |
94 | continue; | |
5f5192b9 TG |
95 | addr = (e820.map[i].addr + PAGE_SIZE-1) >> PAGE_SHIFT; |
96 | end = (e820.map[i].addr + e820.map[i].size) >> PAGE_SHIFT; | |
950f9d95 | 97 | |
950f9d95 | 98 | |
5f5192b9 TG |
99 | if ((pagenr >= addr) && (pagenr < end)) |
100 | return 1; | |
101 | } | |
102 | return 0; | |
103 | } | |
104 | ||
9542ada8 SS |
105 | int pagerange_is_ram(unsigned long start, unsigned long end) |
106 | { | |
107 | int ram_page = 0, not_rampage = 0; | |
108 | unsigned long page_nr; | |
109 | ||
110 | for (page_nr = (start >> PAGE_SHIFT); page_nr < (end >> PAGE_SHIFT); | |
111 | ++page_nr) { | |
112 | if (page_is_ram(page_nr)) | |
113 | ram_page = 1; | |
114 | else | |
115 | not_rampage = 1; | |
116 | ||
117 | if (ram_page == not_rampage) | |
118 | return -1; | |
119 | } | |
120 | ||
121 | return ram_page; | |
122 | } | |
123 | ||
e9332cac TG |
124 | /* |
125 | * Fix up the linear direct mapping of the kernel to avoid cache attribute | |
126 | * conflicts. | |
127 | */ | |
3a96ce8c | 128 | int ioremap_change_attr(unsigned long vaddr, unsigned long size, |
129 | unsigned long prot_val) | |
e9332cac | 130 | { |
d806e5ee | 131 | unsigned long nrpages = size >> PAGE_SHIFT; |
93809be8 | 132 | int err; |
e9332cac | 133 | |
3a96ce8c | 134 | switch (prot_val) { |
135 | case _PAGE_CACHE_UC: | |
d806e5ee | 136 | default: |
1219333d | 137 | err = _set_memory_uc(vaddr, nrpages); |
d806e5ee | 138 | break; |
b310f381 | 139 | case _PAGE_CACHE_WC: |
140 | err = _set_memory_wc(vaddr, nrpages); | |
141 | break; | |
3a96ce8c | 142 | case _PAGE_CACHE_WB: |
1219333d | 143 | err = _set_memory_wb(vaddr, nrpages); |
d806e5ee TG |
144 | break; |
145 | } | |
e9332cac TG |
146 | |
147 | return err; | |
148 | } | |
149 | ||
1da177e4 LT |
150 | /* |
151 | * Remap an arbitrary physical address space into the kernel virtual | |
152 | * address space. Needed when the kernel wants to access high addresses | |
153 | * directly. | |
154 | * | |
155 | * NOTE! We need to allow non-page-aligned mappings too: we will obviously | |
156 | * have to convert them into an offset in a page-aligned mapping, but the | |
157 | * caller shouldn't need to know that small detail. | |
158 | */ | |
23016969 CL |
159 | static void __iomem *__ioremap_caller(resource_size_t phys_addr, |
160 | unsigned long size, unsigned long prot_val, void *caller) | |
1da177e4 | 161 | { |
756a6c68 IM |
162 | unsigned long pfn, offset, vaddr; |
163 | resource_size_t last_addr; | |
87e547fe PP |
164 | const resource_size_t unaligned_phys_addr = phys_addr; |
165 | const unsigned long unaligned_size = size; | |
91eebf40 | 166 | struct vm_struct *area; |
d7677d40 | 167 | unsigned long new_prot_val; |
d806e5ee | 168 | pgprot_t prot; |
dee7cbb2 | 169 | int retval; |
d61fc448 | 170 | void __iomem *ret_addr; |
1da177e4 LT |
171 | |
172 | /* Don't allow wraparound or zero size */ | |
173 | last_addr = phys_addr + size - 1; | |
174 | if (!size || last_addr < phys_addr) | |
175 | return NULL; | |
176 | ||
e3100c82 | 177 | if (!phys_addr_valid(phys_addr)) { |
6997ab49 | 178 | printk(KERN_WARNING "ioremap: invalid physical address %llx\n", |
4c8337ac | 179 | (unsigned long long)phys_addr); |
e3100c82 TG |
180 | WARN_ON_ONCE(1); |
181 | return NULL; | |
182 | } | |
183 | ||
1da177e4 LT |
184 | /* |
185 | * Don't remap the low PCI/ISA area, it's always mapped.. | |
186 | */ | |
bcc643dc | 187 | if (is_ISA_range(phys_addr, last_addr)) |
4b40fcee | 188 | return (__force void __iomem *)phys_to_virt(phys_addr); |
1da177e4 LT |
189 | |
190 | /* | |
191 | * Don't allow anybody to remap normal RAM that we're using.. | |
192 | */ | |
cb8ab687 AS |
193 | for (pfn = phys_addr >> PAGE_SHIFT; |
194 | (pfn << PAGE_SHIFT) < (last_addr & PAGE_MASK); | |
195 | pfn++) { | |
bdd3cee2 | 196 | |
ba748d22 IM |
197 | int is_ram = page_is_ram(pfn); |
198 | ||
199 | if (is_ram && pfn_valid(pfn) && !PageReserved(pfn_to_page(pfn))) | |
266b9f87 | 200 | return NULL; |
ba748d22 | 201 | WARN_ON_ONCE(is_ram); |
1da177e4 LT |
202 | } |
203 | ||
d7677d40 | 204 | /* |
205 | * Mappings have to be page-aligned | |
206 | */ | |
207 | offset = phys_addr & ~PAGE_MASK; | |
208 | phys_addr &= PAGE_MASK; | |
209 | size = PAGE_ALIGN(last_addr+1) - phys_addr; | |
210 | ||
e213e877 | 211 | retval = reserve_memtype(phys_addr, (u64)phys_addr + size, |
dee7cbb2 VP |
212 | prot_val, &new_prot_val); |
213 | if (retval) { | |
b450e5e8 | 214 | pr_debug("Warning: reserve_memtype returned %d\n", retval); |
dee7cbb2 VP |
215 | return NULL; |
216 | } | |
217 | ||
218 | if (prot_val != new_prot_val) { | |
d7677d40 | 219 | /* |
220 | * Do not fallback to certain memory types with certain | |
221 | * requested type: | |
de33c442 SS |
222 | * - request is uc-, return cannot be write-back |
223 | * - request is uc-, return cannot be write-combine | |
b310f381 | 224 | * - request is write-combine, return cannot be write-back |
d7677d40 | 225 | */ |
de33c442 | 226 | if ((prot_val == _PAGE_CACHE_UC_MINUS && |
b310f381 | 227 | (new_prot_val == _PAGE_CACHE_WB || |
228 | new_prot_val == _PAGE_CACHE_WC)) || | |
229 | (prot_val == _PAGE_CACHE_WC && | |
d7677d40 | 230 | new_prot_val == _PAGE_CACHE_WB)) { |
b450e5e8 | 231 | pr_debug( |
6997ab49 | 232 | "ioremap error for 0x%llx-0x%llx, requested 0x%lx, got 0x%lx\n", |
4c8337ac RD |
233 | (unsigned long long)phys_addr, |
234 | (unsigned long long)(phys_addr + size), | |
6997ab49 | 235 | prot_val, new_prot_val); |
d7677d40 | 236 | free_memtype(phys_addr, phys_addr + size); |
237 | return NULL; | |
238 | } | |
239 | prot_val = new_prot_val; | |
240 | } | |
241 | ||
3a96ce8c | 242 | switch (prot_val) { |
243 | case _PAGE_CACHE_UC: | |
d806e5ee | 244 | default: |
be43d728 | 245 | prot = PAGE_KERNEL_IO_NOCACHE; |
d806e5ee | 246 | break; |
de33c442 | 247 | case _PAGE_CACHE_UC_MINUS: |
be43d728 | 248 | prot = PAGE_KERNEL_IO_UC_MINUS; |
de33c442 | 249 | break; |
b310f381 | 250 | case _PAGE_CACHE_WC: |
be43d728 | 251 | prot = PAGE_KERNEL_IO_WC; |
b310f381 | 252 | break; |
3a96ce8c | 253 | case _PAGE_CACHE_WB: |
be43d728 | 254 | prot = PAGE_KERNEL_IO; |
d806e5ee TG |
255 | break; |
256 | } | |
a148ecfd | 257 | |
1da177e4 LT |
258 | /* |
259 | * Ok, go for it.. | |
260 | */ | |
23016969 | 261 | area = get_vm_area_caller(size, VM_IOREMAP, caller); |
1da177e4 LT |
262 | if (!area) |
263 | return NULL; | |
264 | area->phys_addr = phys_addr; | |
e66aadbe TG |
265 | vaddr = (unsigned long) area->addr; |
266 | if (ioremap_page_range(vaddr, vaddr + size, phys_addr, prot)) { | |
d7677d40 | 267 | free_memtype(phys_addr, phys_addr + size); |
b16bf712 | 268 | free_vm_area(area); |
1da177e4 LT |
269 | return NULL; |
270 | } | |
e9332cac | 271 | |
3a96ce8c | 272 | if (ioremap_change_attr(vaddr, size, prot_val) < 0) { |
d7677d40 | 273 | free_memtype(phys_addr, phys_addr + size); |
e66aadbe | 274 | vunmap(area->addr); |
e9332cac TG |
275 | return NULL; |
276 | } | |
277 | ||
d61fc448 | 278 | ret_addr = (void __iomem *) (vaddr + offset); |
87e547fe | 279 | mmiotrace_ioremap(unaligned_phys_addr, unaligned_size, ret_addr); |
d61fc448 PP |
280 | |
281 | return ret_addr; | |
1da177e4 | 282 | } |
1da177e4 LT |
283 | |
284 | /** | |
285 | * ioremap_nocache - map bus memory into CPU space | |
286 | * @offset: bus address of the memory | |
287 | * @size: size of the resource to map | |
288 | * | |
289 | * ioremap_nocache performs a platform specific sequence of operations to | |
290 | * make bus memory CPU accessible via the readb/readw/readl/writeb/ | |
291 | * writew/writel functions and the other mmio helpers. The returned | |
292 | * address is not guaranteed to be usable directly as a virtual | |
91eebf40 | 293 | * address. |
1da177e4 LT |
294 | * |
295 | * This version of ioremap ensures that the memory is marked uncachable | |
296 | * on the CPU as well as honouring existing caching rules from things like | |
91eebf40 | 297 | * the PCI bus. Note that there are other caches and buffers on many |
1da177e4 LT |
298 | * busses. In particular driver authors should read up on PCI writes |
299 | * | |
300 | * It's useful if some control registers are in such an area and | |
301 | * write combining or read caching is not desirable: | |
91eebf40 | 302 | * |
1da177e4 LT |
303 | * Must be freed with iounmap. |
304 | */ | |
b9e76a00 | 305 | void __iomem *ioremap_nocache(resource_size_t phys_addr, unsigned long size) |
1da177e4 | 306 | { |
de33c442 SS |
307 | /* |
308 | * Ideally, this should be: | |
499f8f84 | 309 | * pat_enabled ? _PAGE_CACHE_UC : _PAGE_CACHE_UC_MINUS; |
de33c442 SS |
310 | * |
311 | * Till we fix all X drivers to use ioremap_wc(), we will use | |
312 | * UC MINUS. | |
313 | */ | |
314 | unsigned long val = _PAGE_CACHE_UC_MINUS; | |
315 | ||
316 | return __ioremap_caller(phys_addr, size, val, | |
23016969 | 317 | __builtin_return_address(0)); |
1da177e4 | 318 | } |
129f6946 | 319 | EXPORT_SYMBOL(ioremap_nocache); |
1da177e4 | 320 | |
b310f381 | 321 | /** |
322 | * ioremap_wc - map memory into CPU space write combined | |
323 | * @offset: bus address of the memory | |
324 | * @size: size of the resource to map | |
325 | * | |
326 | * This version of ioremap ensures that the memory is marked write combining. | |
327 | * Write combining allows faster writes to some hardware devices. | |
328 | * | |
329 | * Must be freed with iounmap. | |
330 | */ | |
331 | void __iomem *ioremap_wc(unsigned long phys_addr, unsigned long size) | |
332 | { | |
499f8f84 | 333 | if (pat_enabled) |
23016969 CL |
334 | return __ioremap_caller(phys_addr, size, _PAGE_CACHE_WC, |
335 | __builtin_return_address(0)); | |
b310f381 | 336 | else |
337 | return ioremap_nocache(phys_addr, size); | |
338 | } | |
339 | EXPORT_SYMBOL(ioremap_wc); | |
340 | ||
b9e76a00 | 341 | void __iomem *ioremap_cache(resource_size_t phys_addr, unsigned long size) |
5f868152 | 342 | { |
23016969 CL |
343 | return __ioremap_caller(phys_addr, size, _PAGE_CACHE_WB, |
344 | __builtin_return_address(0)); | |
5f868152 TG |
345 | } |
346 | EXPORT_SYMBOL(ioremap_cache); | |
347 | ||
a361ee5c VP |
348 | static void __iomem *ioremap_default(resource_size_t phys_addr, |
349 | unsigned long size) | |
350 | { | |
351 | unsigned long flags; | |
352 | void *ret; | |
353 | int err; | |
354 | ||
355 | /* | |
356 | * - WB for WB-able memory and no other conflicting mappings | |
357 | * - UC_MINUS for non-WB-able memory with no other conflicting mappings | |
358 | * - Inherit from confliting mappings otherwise | |
359 | */ | |
360 | err = reserve_memtype(phys_addr, phys_addr + size, -1, &flags); | |
361 | if (err < 0) | |
362 | return NULL; | |
363 | ||
364 | ret = (void *) __ioremap_caller(phys_addr, size, flags, | |
365 | __builtin_return_address(0)); | |
366 | ||
367 | free_memtype(phys_addr, phys_addr + size); | |
368 | return (void __iomem *)ret; | |
369 | } | |
370 | ||
28b2ee20 RR |
371 | void __iomem *ioremap_prot(resource_size_t phys_addr, unsigned long size, |
372 | unsigned long prot_val) | |
373 | { | |
374 | return __ioremap_caller(phys_addr, size, (prot_val & _PAGE_CACHE_MASK), | |
375 | __builtin_return_address(0)); | |
376 | } | |
377 | EXPORT_SYMBOL(ioremap_prot); | |
378 | ||
bf5421c3 AK |
379 | /** |
380 | * iounmap - Free a IO remapping | |
381 | * @addr: virtual address from ioremap_* | |
382 | * | |
383 | * Caller must ensure there is only one unmapping for the same pointer. | |
384 | */ | |
1da177e4 LT |
385 | void iounmap(volatile void __iomem *addr) |
386 | { | |
bf5421c3 | 387 | struct vm_struct *p, *o; |
c23a4e96 AM |
388 | |
389 | if ((void __force *)addr <= high_memory) | |
1da177e4 LT |
390 | return; |
391 | ||
392 | /* | |
393 | * __ioremap special-cases the PCI/ISA range by not instantiating a | |
394 | * vm_area and by simply returning an address into the kernel mapping | |
395 | * of ISA space. So handle that here. | |
396 | */ | |
6e92a5a6 TG |
397 | if ((void __force *)addr >= phys_to_virt(ISA_START_ADDRESS) && |
398 | (void __force *)addr < phys_to_virt(ISA_END_ADDRESS)) | |
1da177e4 LT |
399 | return; |
400 | ||
91eebf40 TG |
401 | addr = (volatile void __iomem *) |
402 | (PAGE_MASK & (unsigned long __force)addr); | |
bf5421c3 | 403 | |
d61fc448 PP |
404 | mmiotrace_iounmap(addr); |
405 | ||
bf5421c3 AK |
406 | /* Use the vm area unlocked, assuming the caller |
407 | ensures there isn't another iounmap for the same address | |
408 | in parallel. Reuse of the virtual address is prevented by | |
409 | leaving it in the global lists until we're done with it. | |
410 | cpa takes care of the direct mappings. */ | |
411 | read_lock(&vmlist_lock); | |
412 | for (p = vmlist; p; p = p->next) { | |
6e92a5a6 | 413 | if (p->addr == (void __force *)addr) |
bf5421c3 AK |
414 | break; |
415 | } | |
416 | read_unlock(&vmlist_lock); | |
417 | ||
418 | if (!p) { | |
91eebf40 | 419 | printk(KERN_ERR "iounmap: bad address %p\n", addr); |
c23a4e96 | 420 | dump_stack(); |
bf5421c3 | 421 | return; |
1da177e4 LT |
422 | } |
423 | ||
d7677d40 | 424 | free_memtype(p->phys_addr, p->phys_addr + get_vm_area_size(p)); |
425 | ||
bf5421c3 | 426 | /* Finally remove it */ |
6e92a5a6 | 427 | o = remove_vm_area((void __force *)addr); |
bf5421c3 | 428 | BUG_ON(p != o || o == NULL); |
91eebf40 | 429 | kfree(p); |
1da177e4 | 430 | } |
129f6946 | 431 | EXPORT_SYMBOL(iounmap); |
1da177e4 | 432 | |
e045fb2a | 433 | /* |
434 | * Convert a physical pointer to a virtual kernel pointer for /dev/mem | |
435 | * access | |
436 | */ | |
437 | void *xlate_dev_mem_ptr(unsigned long phys) | |
438 | { | |
439 | void *addr; | |
440 | unsigned long start = phys & PAGE_MASK; | |
441 | ||
442 | /* If page is RAM, we can use __va. Otherwise ioremap and unmap. */ | |
443 | if (page_is_ram(start >> PAGE_SHIFT)) | |
444 | return __va(phys); | |
445 | ||
ae94b807 | 446 | addr = (void __force *)ioremap_default(start, PAGE_SIZE); |
e045fb2a | 447 | if (addr) |
448 | addr = (void *)((unsigned long)addr | (phys & ~PAGE_MASK)); | |
449 | ||
450 | return addr; | |
451 | } | |
452 | ||
453 | void unxlate_dev_mem_ptr(unsigned long phys, void *addr) | |
454 | { | |
455 | if (page_is_ram(phys >> PAGE_SHIFT)) | |
456 | return; | |
457 | ||
458 | iounmap((void __iomem *)((unsigned long)addr & PAGE_MASK)); | |
459 | return; | |
460 | } | |
461 | ||
4b6e9f27 | 462 | static int __initdata early_ioremap_debug; |
d18d6d65 IM |
463 | |
464 | static int __init early_ioremap_debug_setup(char *str) | |
465 | { | |
466 | early_ioremap_debug = 1; | |
467 | ||
793b24a2 | 468 | return 0; |
d18d6d65 | 469 | } |
793b24a2 | 470 | early_param("early_ioremap_debug", early_ioremap_debug_setup); |
d18d6d65 | 471 | |
0947b2f3 | 472 | static __initdata int after_paging_init; |
a7bf0bd5 | 473 | static pte_t bm_pte[PAGE_SIZE/sizeof(pte_t)] __page_aligned_bss; |
0947b2f3 | 474 | |
551889a6 | 475 | static inline pmd_t * __init early_ioremap_pmd(unsigned long addr) |
0947b2f3 | 476 | { |
37cc8d7f JF |
477 | /* Don't assume we're using swapper_pg_dir at this point */ |
478 | pgd_t *base = __va(read_cr3()); | |
479 | pgd_t *pgd = &base[pgd_index(addr)]; | |
551889a6 IC |
480 | pud_t *pud = pud_offset(pgd, addr); |
481 | pmd_t *pmd = pmd_offset(pud, addr); | |
482 | ||
483 | return pmd; | |
0947b2f3 HY |
484 | } |
485 | ||
551889a6 | 486 | static inline pte_t * __init early_ioremap_pte(unsigned long addr) |
0947b2f3 | 487 | { |
551889a6 | 488 | return &bm_pte[pte_index(addr)]; |
0947b2f3 HY |
489 | } |
490 | ||
beacfaac | 491 | void __init early_ioremap_init(void) |
0947b2f3 | 492 | { |
551889a6 | 493 | pmd_t *pmd; |
0947b2f3 | 494 | |
d18d6d65 | 495 | if (early_ioremap_debug) |
adafdf6a | 496 | printk(KERN_INFO "early_ioremap_init()\n"); |
d18d6d65 | 497 | |
551889a6 | 498 | pmd = early_ioremap_pmd(fix_to_virt(FIX_BTMAP_BEGIN)); |
0947b2f3 | 499 | memset(bm_pte, 0, sizeof(bm_pte)); |
b6fbb669 | 500 | pmd_populate_kernel(&init_mm, pmd, bm_pte); |
551889a6 | 501 | |
0e3a9549 | 502 | /* |
551889a6 | 503 | * The boot-ioremap range spans multiple pmds, for which |
0e3a9549 IM |
504 | * we are not prepared: |
505 | */ | |
551889a6 | 506 | if (pmd != early_ioremap_pmd(fix_to_virt(FIX_BTMAP_END))) { |
0e3a9549 | 507 | WARN_ON(1); |
551889a6 IC |
508 | printk(KERN_WARNING "pmd %p != %p\n", |
509 | pmd, early_ioremap_pmd(fix_to_virt(FIX_BTMAP_END))); | |
91eebf40 | 510 | printk(KERN_WARNING "fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n", |
551889a6 | 511 | fix_to_virt(FIX_BTMAP_BEGIN)); |
91eebf40 | 512 | printk(KERN_WARNING "fix_to_virt(FIX_BTMAP_END): %08lx\n", |
551889a6 | 513 | fix_to_virt(FIX_BTMAP_END)); |
91eebf40 TG |
514 | |
515 | printk(KERN_WARNING "FIX_BTMAP_END: %d\n", FIX_BTMAP_END); | |
516 | printk(KERN_WARNING "FIX_BTMAP_BEGIN: %d\n", | |
517 | FIX_BTMAP_BEGIN); | |
0e3a9549 | 518 | } |
0947b2f3 HY |
519 | } |
520 | ||
beacfaac | 521 | void __init early_ioremap_clear(void) |
0947b2f3 | 522 | { |
551889a6 | 523 | pmd_t *pmd; |
0947b2f3 | 524 | |
d18d6d65 | 525 | if (early_ioremap_debug) |
adafdf6a | 526 | printk(KERN_INFO "early_ioremap_clear()\n"); |
d18d6d65 | 527 | |
551889a6 IC |
528 | pmd = early_ioremap_pmd(fix_to_virt(FIX_BTMAP_BEGIN)); |
529 | pmd_clear(pmd); | |
6944a9c8 | 530 | paravirt_release_pte(__pa(bm_pte) >> PAGE_SHIFT); |
0947b2f3 HY |
531 | __flush_tlb_all(); |
532 | } | |
533 | ||
beacfaac | 534 | void __init early_ioremap_reset(void) |
0947b2f3 HY |
535 | { |
536 | enum fixed_addresses idx; | |
551889a6 IC |
537 | unsigned long addr, phys; |
538 | pte_t *pte; | |
0947b2f3 HY |
539 | |
540 | after_paging_init = 1; | |
64a8f852 | 541 | for (idx = FIX_BTMAP_BEGIN; idx >= FIX_BTMAP_END; idx--) { |
0947b2f3 | 542 | addr = fix_to_virt(idx); |
beacfaac | 543 | pte = early_ioremap_pte(addr); |
551889a6 IC |
544 | if (pte_present(*pte)) { |
545 | phys = pte_val(*pte) & PAGE_MASK; | |
0947b2f3 HY |
546 | set_fixmap(idx, phys); |
547 | } | |
548 | } | |
549 | } | |
550 | ||
beacfaac | 551 | static void __init __early_set_fixmap(enum fixed_addresses idx, |
0947b2f3 HY |
552 | unsigned long phys, pgprot_t flags) |
553 | { | |
551889a6 IC |
554 | unsigned long addr = __fix_to_virt(idx); |
555 | pte_t *pte; | |
0947b2f3 HY |
556 | |
557 | if (idx >= __end_of_fixed_addresses) { | |
558 | BUG(); | |
559 | return; | |
560 | } | |
beacfaac | 561 | pte = early_ioremap_pte(addr); |
4583ed51 | 562 | |
0947b2f3 | 563 | if (pgprot_val(flags)) |
551889a6 | 564 | set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, flags)); |
0947b2f3 | 565 | else |
4f9c11dd | 566 | pte_clear(&init_mm, addr, pte); |
0947b2f3 HY |
567 | __flush_tlb_one(addr); |
568 | } | |
569 | ||
beacfaac | 570 | static inline void __init early_set_fixmap(enum fixed_addresses idx, |
14941779 | 571 | unsigned long phys, pgprot_t prot) |
0947b2f3 HY |
572 | { |
573 | if (after_paging_init) | |
14941779 | 574 | __set_fixmap(idx, phys, prot); |
0947b2f3 | 575 | else |
14941779 | 576 | __early_set_fixmap(idx, phys, prot); |
0947b2f3 HY |
577 | } |
578 | ||
beacfaac | 579 | static inline void __init early_clear_fixmap(enum fixed_addresses idx) |
0947b2f3 HY |
580 | { |
581 | if (after_paging_init) | |
582 | clear_fixmap(idx); | |
583 | else | |
beacfaac | 584 | __early_set_fixmap(idx, 0, __pgprot(0)); |
0947b2f3 HY |
585 | } |
586 | ||
1b42f516 | 587 | |
4b6e9f27 | 588 | static int __initdata early_ioremap_nested; |
1b42f516 | 589 | |
d690b2af IM |
590 | static int __init check_early_ioremap_leak(void) |
591 | { | |
592 | if (!early_ioremap_nested) | |
593 | return 0; | |
0c072bb4 | 594 | WARN(1, KERN_WARNING |
91eebf40 | 595 | "Debug warning: early ioremap leak of %d areas detected.\n", |
0c072bb4 | 596 | early_ioremap_nested); |
d690b2af | 597 | printk(KERN_WARNING |
0c072bb4 | 598 | "please boot with early_ioremap_debug and report the dmesg.\n"); |
d690b2af IM |
599 | |
600 | return 1; | |
601 | } | |
602 | late_initcall(check_early_ioremap_leak); | |
603 | ||
14941779 | 604 | static void __init *__early_ioremap(unsigned long phys_addr, unsigned long size, pgprot_t prot) |
1da177e4 LT |
605 | { |
606 | unsigned long offset, last_addr; | |
1b42f516 IM |
607 | unsigned int nrpages, nesting; |
608 | enum fixed_addresses idx0, idx; | |
609 | ||
610 | WARN_ON(system_state != SYSTEM_BOOTING); | |
611 | ||
612 | nesting = early_ioremap_nested; | |
d18d6d65 | 613 | if (early_ioremap_debug) { |
adafdf6a | 614 | printk(KERN_INFO "early_ioremap(%08lx, %08lx) [%d] => ", |
91eebf40 | 615 | phys_addr, size, nesting); |
d18d6d65 IM |
616 | dump_stack(); |
617 | } | |
1da177e4 LT |
618 | |
619 | /* Don't allow wraparound or zero size */ | |
620 | last_addr = phys_addr + size - 1; | |
bd796ed0 IM |
621 | if (!size || last_addr < phys_addr) { |
622 | WARN_ON(1); | |
1da177e4 | 623 | return NULL; |
bd796ed0 | 624 | } |
1da177e4 | 625 | |
bd796ed0 IM |
626 | if (nesting >= FIX_BTMAPS_NESTING) { |
627 | WARN_ON(1); | |
1b42f516 | 628 | return NULL; |
bd796ed0 | 629 | } |
1b42f516 | 630 | early_ioremap_nested++; |
1da177e4 LT |
631 | /* |
632 | * Mappings have to be page-aligned | |
633 | */ | |
634 | offset = phys_addr & ~PAGE_MASK; | |
635 | phys_addr &= PAGE_MASK; | |
c613ec1a | 636 | size = PAGE_ALIGN(last_addr + 1) - phys_addr; |
1da177e4 LT |
637 | |
638 | /* | |
639 | * Mappings have to fit in the FIX_BTMAP area. | |
640 | */ | |
641 | nrpages = size >> PAGE_SHIFT; | |
bd796ed0 IM |
642 | if (nrpages > NR_FIX_BTMAPS) { |
643 | WARN_ON(1); | |
1da177e4 | 644 | return NULL; |
bd796ed0 | 645 | } |
1da177e4 LT |
646 | |
647 | /* | |
648 | * Ok, go for it.. | |
649 | */ | |
1b42f516 IM |
650 | idx0 = FIX_BTMAP_BEGIN - NR_FIX_BTMAPS*nesting; |
651 | idx = idx0; | |
1da177e4 | 652 | while (nrpages > 0) { |
14941779 | 653 | early_set_fixmap(idx, phys_addr, prot); |
1da177e4 LT |
654 | phys_addr += PAGE_SIZE; |
655 | --idx; | |
656 | --nrpages; | |
657 | } | |
d18d6d65 IM |
658 | if (early_ioremap_debug) |
659 | printk(KERN_CONT "%08lx + %08lx\n", offset, fix_to_virt(idx0)); | |
1b42f516 | 660 | |
91eebf40 | 661 | return (void *) (offset + fix_to_virt(idx0)); |
1da177e4 LT |
662 | } |
663 | ||
14941779 JF |
664 | /* Remap an IO device */ |
665 | void __init *early_ioremap(unsigned long phys_addr, unsigned long size) | |
666 | { | |
667 | return __early_ioremap(phys_addr, size, PAGE_KERNEL_IO); | |
668 | } | |
669 | ||
670 | /* Remap memory */ | |
671 | void __init *early_memremap(unsigned long phys_addr, unsigned long size) | |
672 | { | |
673 | return __early_ioremap(phys_addr, size, PAGE_KERNEL); | |
674 | } | |
675 | ||
beacfaac | 676 | void __init early_iounmap(void *addr, unsigned long size) |
1da177e4 LT |
677 | { |
678 | unsigned long virt_addr; | |
679 | unsigned long offset; | |
680 | unsigned int nrpages; | |
681 | enum fixed_addresses idx; | |
226e9a93 | 682 | int nesting; |
1b42f516 IM |
683 | |
684 | nesting = --early_ioremap_nested; | |
226e9a93 IM |
685 | if (WARN_ON(nesting < 0)) |
686 | return; | |
1da177e4 | 687 | |
d18d6d65 | 688 | if (early_ioremap_debug) { |
adafdf6a | 689 | printk(KERN_INFO "early_iounmap(%p, %08lx) [%d]\n", addr, |
91eebf40 | 690 | size, nesting); |
d18d6d65 IM |
691 | dump_stack(); |
692 | } | |
693 | ||
1da177e4 | 694 | virt_addr = (unsigned long)addr; |
bd796ed0 IM |
695 | if (virt_addr < fix_to_virt(FIX_BTMAP_BEGIN)) { |
696 | WARN_ON(1); | |
1da177e4 | 697 | return; |
bd796ed0 | 698 | } |
1da177e4 LT |
699 | offset = virt_addr & ~PAGE_MASK; |
700 | nrpages = PAGE_ALIGN(offset + size - 1) >> PAGE_SHIFT; | |
701 | ||
1b42f516 | 702 | idx = FIX_BTMAP_BEGIN - NR_FIX_BTMAPS*nesting; |
1da177e4 | 703 | while (nrpages > 0) { |
beacfaac | 704 | early_clear_fixmap(idx); |
1da177e4 LT |
705 | --idx; |
706 | --nrpages; | |
707 | } | |
708 | } | |
1b42f516 IM |
709 | |
710 | void __this_fixmap_does_not_exist(void) | |
711 | { | |
712 | WARN_ON(1); | |
713 | } |