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 | ||
27 | unsigned long __phys_addr(unsigned long x) | |
28 | { | |
29 | if (x >= __START_KERNEL_map) | |
30 | return x - __START_KERNEL_map + phys_base; | |
31 | return x - PAGE_OFFSET; | |
32 | } | |
33 | EXPORT_SYMBOL(__phys_addr); | |
34 | ||
e3100c82 TG |
35 | static inline int phys_addr_valid(unsigned long addr) |
36 | { | |
37 | return addr < (1UL << boot_cpu_data.x86_phys_bits); | |
38 | } | |
39 | ||
40 | #else | |
41 | ||
42 | static inline int phys_addr_valid(unsigned long addr) | |
43 | { | |
44 | return 1; | |
45 | } | |
46 | ||
240d3a7c TG |
47 | #endif |
48 | ||
5f5192b9 TG |
49 | int page_is_ram(unsigned long pagenr) |
50 | { | |
756a6c68 | 51 | resource_size_t addr, end; |
5f5192b9 TG |
52 | int i; |
53 | ||
d8a9e6a5 AV |
54 | /* |
55 | * A special case is the first 4Kb of memory; | |
56 | * This is a BIOS owned area, not kernel ram, but generally | |
57 | * not listed as such in the E820 table. | |
58 | */ | |
59 | if (pagenr == 0) | |
60 | return 0; | |
61 | ||
156fbc3f AV |
62 | /* |
63 | * Second special case: Some BIOSen report the PC BIOS | |
64 | * area (640->1Mb) as ram even though it is not. | |
65 | */ | |
66 | if (pagenr >= (BIOS_BEGIN >> PAGE_SHIFT) && | |
67 | pagenr < (BIOS_END >> PAGE_SHIFT)) | |
68 | return 0; | |
d8a9e6a5 | 69 | |
5f5192b9 TG |
70 | for (i = 0; i < e820.nr_map; i++) { |
71 | /* | |
72 | * Not usable memory: | |
73 | */ | |
74 | if (e820.map[i].type != E820_RAM) | |
75 | continue; | |
5f5192b9 TG |
76 | addr = (e820.map[i].addr + PAGE_SIZE-1) >> PAGE_SHIFT; |
77 | end = (e820.map[i].addr + e820.map[i].size) >> PAGE_SHIFT; | |
950f9d95 | 78 | |
950f9d95 | 79 | |
5f5192b9 TG |
80 | if ((pagenr >= addr) && (pagenr < end)) |
81 | return 1; | |
82 | } | |
83 | return 0; | |
84 | } | |
85 | ||
e9332cac TG |
86 | /* |
87 | * Fix up the linear direct mapping of the kernel to avoid cache attribute | |
88 | * conflicts. | |
89 | */ | |
3a96ce8c | 90 | int ioremap_change_attr(unsigned long vaddr, unsigned long size, |
91 | unsigned long prot_val) | |
e9332cac | 92 | { |
d806e5ee | 93 | unsigned long nrpages = size >> PAGE_SHIFT; |
93809be8 | 94 | int err; |
e9332cac | 95 | |
3a96ce8c | 96 | switch (prot_val) { |
97 | case _PAGE_CACHE_UC: | |
d806e5ee | 98 | default: |
1219333d | 99 | err = _set_memory_uc(vaddr, nrpages); |
d806e5ee | 100 | break; |
b310f381 | 101 | case _PAGE_CACHE_WC: |
102 | err = _set_memory_wc(vaddr, nrpages); | |
103 | break; | |
3a96ce8c | 104 | case _PAGE_CACHE_WB: |
1219333d | 105 | err = _set_memory_wb(vaddr, nrpages); |
d806e5ee TG |
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 | */ | |
23016969 CL |
121 | static void __iomem *__ioremap_caller(resource_size_t phys_addr, |
122 | unsigned long size, unsigned long prot_val, void *caller) | |
1da177e4 | 123 | { |
756a6c68 IM |
124 | unsigned long pfn, offset, vaddr; |
125 | resource_size_t last_addr; | |
91eebf40 | 126 | struct vm_struct *area; |
d7677d40 | 127 | unsigned long new_prot_val; |
d806e5ee | 128 | pgprot_t prot; |
dee7cbb2 | 129 | int retval; |
d61fc448 | 130 | void __iomem *ret_addr; |
1da177e4 LT |
131 | |
132 | /* Don't allow wraparound or zero size */ | |
133 | last_addr = phys_addr + size - 1; | |
134 | if (!size || last_addr < phys_addr) | |
135 | return NULL; | |
136 | ||
e3100c82 | 137 | if (!phys_addr_valid(phys_addr)) { |
6997ab49 | 138 | printk(KERN_WARNING "ioremap: invalid physical address %llx\n", |
4c8337ac | 139 | (unsigned long long)phys_addr); |
e3100c82 TG |
140 | WARN_ON_ONCE(1); |
141 | return NULL; | |
142 | } | |
143 | ||
1da177e4 LT |
144 | /* |
145 | * Don't remap the low PCI/ISA area, it's always mapped.. | |
146 | */ | |
147 | if (phys_addr >= ISA_START_ADDRESS && last_addr < ISA_END_ADDRESS) | |
4b40fcee | 148 | return (__force void __iomem *)phys_to_virt(phys_addr); |
1da177e4 LT |
149 | |
150 | /* | |
151 | * Don't allow anybody to remap normal RAM that we're using.. | |
152 | */ | |
cb8ab687 AS |
153 | for (pfn = phys_addr >> PAGE_SHIFT; |
154 | (pfn << PAGE_SHIFT) < (last_addr & PAGE_MASK); | |
155 | pfn++) { | |
bdd3cee2 | 156 | |
ba748d22 IM |
157 | int is_ram = page_is_ram(pfn); |
158 | ||
159 | if (is_ram && pfn_valid(pfn) && !PageReserved(pfn_to_page(pfn))) | |
266b9f87 | 160 | return NULL; |
ba748d22 | 161 | WARN_ON_ONCE(is_ram); |
1da177e4 LT |
162 | } |
163 | ||
d7677d40 | 164 | /* |
165 | * Mappings have to be page-aligned | |
166 | */ | |
167 | offset = phys_addr & ~PAGE_MASK; | |
168 | phys_addr &= PAGE_MASK; | |
169 | size = PAGE_ALIGN(last_addr+1) - phys_addr; | |
170 | ||
dee7cbb2 VP |
171 | retval = reserve_memtype(phys_addr, phys_addr + size, |
172 | prot_val, &new_prot_val); | |
173 | if (retval) { | |
b450e5e8 | 174 | pr_debug("Warning: reserve_memtype returned %d\n", retval); |
dee7cbb2 VP |
175 | return NULL; |
176 | } | |
177 | ||
178 | if (prot_val != new_prot_val) { | |
d7677d40 | 179 | /* |
180 | * Do not fallback to certain memory types with certain | |
181 | * requested type: | |
de33c442 SS |
182 | * - request is uc-, return cannot be write-back |
183 | * - request is uc-, return cannot be write-combine | |
b310f381 | 184 | * - request is write-combine, return cannot be write-back |
d7677d40 | 185 | */ |
de33c442 | 186 | if ((prot_val == _PAGE_CACHE_UC_MINUS && |
b310f381 | 187 | (new_prot_val == _PAGE_CACHE_WB || |
188 | new_prot_val == _PAGE_CACHE_WC)) || | |
189 | (prot_val == _PAGE_CACHE_WC && | |
d7677d40 | 190 | new_prot_val == _PAGE_CACHE_WB)) { |
b450e5e8 | 191 | pr_debug( |
6997ab49 | 192 | "ioremap error for 0x%llx-0x%llx, requested 0x%lx, got 0x%lx\n", |
4c8337ac RD |
193 | (unsigned long long)phys_addr, |
194 | (unsigned long long)(phys_addr + size), | |
6997ab49 | 195 | prot_val, new_prot_val); |
d7677d40 | 196 | free_memtype(phys_addr, phys_addr + size); |
197 | return NULL; | |
198 | } | |
199 | prot_val = new_prot_val; | |
200 | } | |
201 | ||
3a96ce8c | 202 | switch (prot_val) { |
203 | case _PAGE_CACHE_UC: | |
d806e5ee | 204 | default: |
55c62682 | 205 | prot = PAGE_KERNEL_NOCACHE; |
d806e5ee | 206 | break; |
de33c442 SS |
207 | case _PAGE_CACHE_UC_MINUS: |
208 | prot = PAGE_KERNEL_UC_MINUS; | |
209 | break; | |
b310f381 | 210 | case _PAGE_CACHE_WC: |
211 | prot = PAGE_KERNEL_WC; | |
212 | break; | |
3a96ce8c | 213 | case _PAGE_CACHE_WB: |
d806e5ee TG |
214 | prot = PAGE_KERNEL; |
215 | break; | |
216 | } | |
a148ecfd | 217 | |
1da177e4 LT |
218 | /* |
219 | * Ok, go for it.. | |
220 | */ | |
23016969 | 221 | area = get_vm_area_caller(size, VM_IOREMAP, caller); |
1da177e4 LT |
222 | if (!area) |
223 | return NULL; | |
224 | area->phys_addr = phys_addr; | |
e66aadbe TG |
225 | vaddr = (unsigned long) area->addr; |
226 | if (ioremap_page_range(vaddr, vaddr + size, phys_addr, prot)) { | |
d7677d40 | 227 | free_memtype(phys_addr, phys_addr + size); |
b16bf712 | 228 | free_vm_area(area); |
1da177e4 LT |
229 | return NULL; |
230 | } | |
e9332cac | 231 | |
3a96ce8c | 232 | if (ioremap_change_attr(vaddr, size, prot_val) < 0) { |
d7677d40 | 233 | free_memtype(phys_addr, phys_addr + size); |
e66aadbe | 234 | vunmap(area->addr); |
e9332cac TG |
235 | return NULL; |
236 | } | |
237 | ||
d61fc448 PP |
238 | ret_addr = (void __iomem *) (vaddr + offset); |
239 | mmiotrace_ioremap(phys_addr, size, ret_addr); | |
240 | ||
241 | return ret_addr; | |
1da177e4 | 242 | } |
1da177e4 LT |
243 | |
244 | /** | |
245 | * ioremap_nocache - map bus memory into CPU space | |
246 | * @offset: bus address of the memory | |
247 | * @size: size of the resource to map | |
248 | * | |
249 | * ioremap_nocache performs a platform specific sequence of operations to | |
250 | * make bus memory CPU accessible via the readb/readw/readl/writeb/ | |
251 | * writew/writel functions and the other mmio helpers. The returned | |
252 | * address is not guaranteed to be usable directly as a virtual | |
91eebf40 | 253 | * address. |
1da177e4 LT |
254 | * |
255 | * This version of ioremap ensures that the memory is marked uncachable | |
256 | * on the CPU as well as honouring existing caching rules from things like | |
91eebf40 | 257 | * the PCI bus. Note that there are other caches and buffers on many |
1da177e4 LT |
258 | * busses. In particular driver authors should read up on PCI writes |
259 | * | |
260 | * It's useful if some control registers are in such an area and | |
261 | * write combining or read caching is not desirable: | |
91eebf40 | 262 | * |
1da177e4 LT |
263 | * Must be freed with iounmap. |
264 | */ | |
b9e76a00 | 265 | void __iomem *ioremap_nocache(resource_size_t phys_addr, unsigned long size) |
1da177e4 | 266 | { |
de33c442 SS |
267 | /* |
268 | * Ideally, this should be: | |
269 | * pat_wc_enabled ? _PAGE_CACHE_UC : _PAGE_CACHE_UC_MINUS; | |
270 | * | |
271 | * Till we fix all X drivers to use ioremap_wc(), we will use | |
272 | * UC MINUS. | |
273 | */ | |
274 | unsigned long val = _PAGE_CACHE_UC_MINUS; | |
275 | ||
276 | return __ioremap_caller(phys_addr, size, val, | |
23016969 | 277 | __builtin_return_address(0)); |
1da177e4 | 278 | } |
129f6946 | 279 | EXPORT_SYMBOL(ioremap_nocache); |
1da177e4 | 280 | |
b310f381 | 281 | /** |
282 | * ioremap_wc - map memory into CPU space write combined | |
283 | * @offset: bus address of the memory | |
284 | * @size: size of the resource to map | |
285 | * | |
286 | * This version of ioremap ensures that the memory is marked write combining. | |
287 | * Write combining allows faster writes to some hardware devices. | |
288 | * | |
289 | * Must be freed with iounmap. | |
290 | */ | |
291 | void __iomem *ioremap_wc(unsigned long phys_addr, unsigned long size) | |
292 | { | |
293 | if (pat_wc_enabled) | |
23016969 CL |
294 | return __ioremap_caller(phys_addr, size, _PAGE_CACHE_WC, |
295 | __builtin_return_address(0)); | |
b310f381 | 296 | else |
297 | return ioremap_nocache(phys_addr, size); | |
298 | } | |
299 | EXPORT_SYMBOL(ioremap_wc); | |
300 | ||
b9e76a00 | 301 | void __iomem *ioremap_cache(resource_size_t phys_addr, unsigned long size) |
5f868152 | 302 | { |
23016969 CL |
303 | return __ioremap_caller(phys_addr, size, _PAGE_CACHE_WB, |
304 | __builtin_return_address(0)); | |
5f868152 TG |
305 | } |
306 | EXPORT_SYMBOL(ioremap_cache); | |
307 | ||
bf5421c3 AK |
308 | /** |
309 | * iounmap - Free a IO remapping | |
310 | * @addr: virtual address from ioremap_* | |
311 | * | |
312 | * Caller must ensure there is only one unmapping for the same pointer. | |
313 | */ | |
1da177e4 LT |
314 | void iounmap(volatile void __iomem *addr) |
315 | { | |
bf5421c3 | 316 | struct vm_struct *p, *o; |
c23a4e96 AM |
317 | |
318 | if ((void __force *)addr <= high_memory) | |
1da177e4 LT |
319 | return; |
320 | ||
321 | /* | |
322 | * __ioremap special-cases the PCI/ISA range by not instantiating a | |
323 | * vm_area and by simply returning an address into the kernel mapping | |
324 | * of ISA space. So handle that here. | |
325 | */ | |
326 | if (addr >= phys_to_virt(ISA_START_ADDRESS) && | |
91eebf40 | 327 | addr < phys_to_virt(ISA_END_ADDRESS)) |
1da177e4 LT |
328 | return; |
329 | ||
91eebf40 TG |
330 | addr = (volatile void __iomem *) |
331 | (PAGE_MASK & (unsigned long __force)addr); | |
bf5421c3 | 332 | |
d61fc448 PP |
333 | mmiotrace_iounmap(addr); |
334 | ||
bf5421c3 AK |
335 | /* Use the vm area unlocked, assuming the caller |
336 | ensures there isn't another iounmap for the same address | |
337 | in parallel. Reuse of the virtual address is prevented by | |
338 | leaving it in the global lists until we're done with it. | |
339 | cpa takes care of the direct mappings. */ | |
340 | read_lock(&vmlist_lock); | |
341 | for (p = vmlist; p; p = p->next) { | |
342 | if (p->addr == addr) | |
343 | break; | |
344 | } | |
345 | read_unlock(&vmlist_lock); | |
346 | ||
347 | if (!p) { | |
91eebf40 | 348 | printk(KERN_ERR "iounmap: bad address %p\n", addr); |
c23a4e96 | 349 | dump_stack(); |
bf5421c3 | 350 | return; |
1da177e4 LT |
351 | } |
352 | ||
d7677d40 | 353 | free_memtype(p->phys_addr, p->phys_addr + get_vm_area_size(p)); |
354 | ||
bf5421c3 AK |
355 | /* Finally remove it */ |
356 | o = remove_vm_area((void *)addr); | |
357 | BUG_ON(p != o || o == NULL); | |
91eebf40 | 358 | kfree(p); |
1da177e4 | 359 | } |
129f6946 | 360 | EXPORT_SYMBOL(iounmap); |
1da177e4 | 361 | |
e045fb2a | 362 | /* |
363 | * Convert a physical pointer to a virtual kernel pointer for /dev/mem | |
364 | * access | |
365 | */ | |
366 | void *xlate_dev_mem_ptr(unsigned long phys) | |
367 | { | |
368 | void *addr; | |
369 | unsigned long start = phys & PAGE_MASK; | |
370 | ||
371 | /* If page is RAM, we can use __va. Otherwise ioremap and unmap. */ | |
372 | if (page_is_ram(start >> PAGE_SHIFT)) | |
373 | return __va(phys); | |
374 | ||
375 | addr = (void *)ioremap(start, PAGE_SIZE); | |
376 | if (addr) | |
377 | addr = (void *)((unsigned long)addr | (phys & ~PAGE_MASK)); | |
378 | ||
379 | return addr; | |
380 | } | |
381 | ||
382 | void unxlate_dev_mem_ptr(unsigned long phys, void *addr) | |
383 | { | |
384 | if (page_is_ram(phys >> PAGE_SHIFT)) | |
385 | return; | |
386 | ||
387 | iounmap((void __iomem *)((unsigned long)addr & PAGE_MASK)); | |
388 | return; | |
389 | } | |
390 | ||
240d3a7c | 391 | #ifdef CONFIG_X86_32 |
d18d6d65 IM |
392 | |
393 | int __initdata early_ioremap_debug; | |
394 | ||
395 | static int __init early_ioremap_debug_setup(char *str) | |
396 | { | |
397 | early_ioremap_debug = 1; | |
398 | ||
793b24a2 | 399 | return 0; |
d18d6d65 | 400 | } |
793b24a2 | 401 | early_param("early_ioremap_debug", early_ioremap_debug_setup); |
d18d6d65 | 402 | |
0947b2f3 | 403 | static __initdata int after_paging_init; |
c92a7a54 IC |
404 | static pte_t bm_pte[PAGE_SIZE/sizeof(pte_t)] |
405 | __section(.bss.page_aligned); | |
0947b2f3 | 406 | |
551889a6 | 407 | static inline pmd_t * __init early_ioremap_pmd(unsigned long addr) |
0947b2f3 | 408 | { |
37cc8d7f JF |
409 | /* Don't assume we're using swapper_pg_dir at this point */ |
410 | pgd_t *base = __va(read_cr3()); | |
411 | pgd_t *pgd = &base[pgd_index(addr)]; | |
551889a6 IC |
412 | pud_t *pud = pud_offset(pgd, addr); |
413 | pmd_t *pmd = pmd_offset(pud, addr); | |
414 | ||
415 | return pmd; | |
0947b2f3 HY |
416 | } |
417 | ||
551889a6 | 418 | static inline pte_t * __init early_ioremap_pte(unsigned long addr) |
0947b2f3 | 419 | { |
551889a6 | 420 | return &bm_pte[pte_index(addr)]; |
0947b2f3 HY |
421 | } |
422 | ||
beacfaac | 423 | void __init early_ioremap_init(void) |
0947b2f3 | 424 | { |
551889a6 | 425 | pmd_t *pmd; |
0947b2f3 | 426 | |
d18d6d65 | 427 | if (early_ioremap_debug) |
adafdf6a | 428 | printk(KERN_INFO "early_ioremap_init()\n"); |
d18d6d65 | 429 | |
551889a6 | 430 | pmd = early_ioremap_pmd(fix_to_virt(FIX_BTMAP_BEGIN)); |
0947b2f3 | 431 | memset(bm_pte, 0, sizeof(bm_pte)); |
b6fbb669 | 432 | pmd_populate_kernel(&init_mm, pmd, bm_pte); |
551889a6 | 433 | |
0e3a9549 | 434 | /* |
551889a6 | 435 | * The boot-ioremap range spans multiple pmds, for which |
0e3a9549 IM |
436 | * we are not prepared: |
437 | */ | |
551889a6 | 438 | if (pmd != early_ioremap_pmd(fix_to_virt(FIX_BTMAP_END))) { |
0e3a9549 | 439 | WARN_ON(1); |
551889a6 IC |
440 | printk(KERN_WARNING "pmd %p != %p\n", |
441 | pmd, early_ioremap_pmd(fix_to_virt(FIX_BTMAP_END))); | |
91eebf40 | 442 | printk(KERN_WARNING "fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n", |
551889a6 | 443 | fix_to_virt(FIX_BTMAP_BEGIN)); |
91eebf40 | 444 | printk(KERN_WARNING "fix_to_virt(FIX_BTMAP_END): %08lx\n", |
551889a6 | 445 | fix_to_virt(FIX_BTMAP_END)); |
91eebf40 TG |
446 | |
447 | printk(KERN_WARNING "FIX_BTMAP_END: %d\n", FIX_BTMAP_END); | |
448 | printk(KERN_WARNING "FIX_BTMAP_BEGIN: %d\n", | |
449 | FIX_BTMAP_BEGIN); | |
0e3a9549 | 450 | } |
0947b2f3 HY |
451 | } |
452 | ||
beacfaac | 453 | void __init early_ioremap_clear(void) |
0947b2f3 | 454 | { |
551889a6 | 455 | pmd_t *pmd; |
0947b2f3 | 456 | |
d18d6d65 | 457 | if (early_ioremap_debug) |
adafdf6a | 458 | printk(KERN_INFO "early_ioremap_clear()\n"); |
d18d6d65 | 459 | |
551889a6 IC |
460 | pmd = early_ioremap_pmd(fix_to_virt(FIX_BTMAP_BEGIN)); |
461 | pmd_clear(pmd); | |
6944a9c8 | 462 | paravirt_release_pte(__pa(bm_pte) >> PAGE_SHIFT); |
0947b2f3 HY |
463 | __flush_tlb_all(); |
464 | } | |
465 | ||
beacfaac | 466 | void __init early_ioremap_reset(void) |
0947b2f3 HY |
467 | { |
468 | enum fixed_addresses idx; | |
551889a6 IC |
469 | unsigned long addr, phys; |
470 | pte_t *pte; | |
0947b2f3 HY |
471 | |
472 | after_paging_init = 1; | |
64a8f852 | 473 | for (idx = FIX_BTMAP_BEGIN; idx >= FIX_BTMAP_END; idx--) { |
0947b2f3 | 474 | addr = fix_to_virt(idx); |
beacfaac | 475 | pte = early_ioremap_pte(addr); |
551889a6 IC |
476 | if (pte_present(*pte)) { |
477 | phys = pte_val(*pte) & PAGE_MASK; | |
0947b2f3 HY |
478 | set_fixmap(idx, phys); |
479 | } | |
480 | } | |
481 | } | |
482 | ||
beacfaac | 483 | static void __init __early_set_fixmap(enum fixed_addresses idx, |
0947b2f3 HY |
484 | unsigned long phys, pgprot_t flags) |
485 | { | |
551889a6 IC |
486 | unsigned long addr = __fix_to_virt(idx); |
487 | pte_t *pte; | |
0947b2f3 HY |
488 | |
489 | if (idx >= __end_of_fixed_addresses) { | |
490 | BUG(); | |
491 | return; | |
492 | } | |
beacfaac | 493 | pte = early_ioremap_pte(addr); |
0947b2f3 | 494 | if (pgprot_val(flags)) |
551889a6 | 495 | set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, flags)); |
0947b2f3 | 496 | else |
551889a6 | 497 | pte_clear(NULL, addr, pte); |
0947b2f3 HY |
498 | __flush_tlb_one(addr); |
499 | } | |
500 | ||
beacfaac | 501 | static inline void __init early_set_fixmap(enum fixed_addresses idx, |
0947b2f3 HY |
502 | unsigned long phys) |
503 | { | |
504 | if (after_paging_init) | |
505 | set_fixmap(idx, phys); | |
506 | else | |
beacfaac | 507 | __early_set_fixmap(idx, phys, PAGE_KERNEL); |
0947b2f3 HY |
508 | } |
509 | ||
beacfaac | 510 | static inline void __init early_clear_fixmap(enum fixed_addresses idx) |
0947b2f3 HY |
511 | { |
512 | if (after_paging_init) | |
513 | clear_fixmap(idx); | |
514 | else | |
beacfaac | 515 | __early_set_fixmap(idx, 0, __pgprot(0)); |
0947b2f3 HY |
516 | } |
517 | ||
1b42f516 IM |
518 | |
519 | int __initdata early_ioremap_nested; | |
520 | ||
d690b2af IM |
521 | static int __init check_early_ioremap_leak(void) |
522 | { | |
523 | if (!early_ioremap_nested) | |
524 | return 0; | |
525 | ||
526 | printk(KERN_WARNING | |
91eebf40 TG |
527 | "Debug warning: early ioremap leak of %d areas detected.\n", |
528 | early_ioremap_nested); | |
d690b2af | 529 | printk(KERN_WARNING |
91eebf40 | 530 | "please boot with early_ioremap_debug and report the dmesg.\n"); |
d690b2af IM |
531 | WARN_ON(1); |
532 | ||
533 | return 1; | |
534 | } | |
535 | late_initcall(check_early_ioremap_leak); | |
536 | ||
beacfaac | 537 | void __init *early_ioremap(unsigned long phys_addr, unsigned long size) |
1da177e4 LT |
538 | { |
539 | unsigned long offset, last_addr; | |
1b42f516 IM |
540 | unsigned int nrpages, nesting; |
541 | enum fixed_addresses idx0, idx; | |
542 | ||
543 | WARN_ON(system_state != SYSTEM_BOOTING); | |
544 | ||
545 | nesting = early_ioremap_nested; | |
d18d6d65 | 546 | if (early_ioremap_debug) { |
adafdf6a | 547 | printk(KERN_INFO "early_ioremap(%08lx, %08lx) [%d] => ", |
91eebf40 | 548 | phys_addr, size, nesting); |
d18d6d65 IM |
549 | dump_stack(); |
550 | } | |
1da177e4 LT |
551 | |
552 | /* Don't allow wraparound or zero size */ | |
553 | last_addr = phys_addr + size - 1; | |
bd796ed0 IM |
554 | if (!size || last_addr < phys_addr) { |
555 | WARN_ON(1); | |
1da177e4 | 556 | return NULL; |
bd796ed0 | 557 | } |
1da177e4 | 558 | |
bd796ed0 IM |
559 | if (nesting >= FIX_BTMAPS_NESTING) { |
560 | WARN_ON(1); | |
1b42f516 | 561 | return NULL; |
bd796ed0 | 562 | } |
1b42f516 | 563 | early_ioremap_nested++; |
1da177e4 LT |
564 | /* |
565 | * Mappings have to be page-aligned | |
566 | */ | |
567 | offset = phys_addr & ~PAGE_MASK; | |
568 | phys_addr &= PAGE_MASK; | |
569 | size = PAGE_ALIGN(last_addr) - phys_addr; | |
570 | ||
571 | /* | |
572 | * Mappings have to fit in the FIX_BTMAP area. | |
573 | */ | |
574 | nrpages = size >> PAGE_SHIFT; | |
bd796ed0 IM |
575 | if (nrpages > NR_FIX_BTMAPS) { |
576 | WARN_ON(1); | |
1da177e4 | 577 | return NULL; |
bd796ed0 | 578 | } |
1da177e4 LT |
579 | |
580 | /* | |
581 | * Ok, go for it.. | |
582 | */ | |
1b42f516 IM |
583 | idx0 = FIX_BTMAP_BEGIN - NR_FIX_BTMAPS*nesting; |
584 | idx = idx0; | |
1da177e4 | 585 | while (nrpages > 0) { |
beacfaac | 586 | early_set_fixmap(idx, phys_addr); |
1da177e4 LT |
587 | phys_addr += PAGE_SIZE; |
588 | --idx; | |
589 | --nrpages; | |
590 | } | |
d18d6d65 IM |
591 | if (early_ioremap_debug) |
592 | printk(KERN_CONT "%08lx + %08lx\n", offset, fix_to_virt(idx0)); | |
1b42f516 | 593 | |
91eebf40 | 594 | return (void *) (offset + fix_to_virt(idx0)); |
1da177e4 LT |
595 | } |
596 | ||
beacfaac | 597 | void __init early_iounmap(void *addr, unsigned long size) |
1da177e4 LT |
598 | { |
599 | unsigned long virt_addr; | |
600 | unsigned long offset; | |
601 | unsigned int nrpages; | |
602 | enum fixed_addresses idx; | |
1b42f516 IM |
603 | unsigned int nesting; |
604 | ||
605 | nesting = --early_ioremap_nested; | |
bd796ed0 | 606 | WARN_ON(nesting < 0); |
1da177e4 | 607 | |
d18d6d65 | 608 | if (early_ioremap_debug) { |
adafdf6a | 609 | printk(KERN_INFO "early_iounmap(%p, %08lx) [%d]\n", addr, |
91eebf40 | 610 | size, nesting); |
d18d6d65 IM |
611 | dump_stack(); |
612 | } | |
613 | ||
1da177e4 | 614 | virt_addr = (unsigned long)addr; |
bd796ed0 IM |
615 | if (virt_addr < fix_to_virt(FIX_BTMAP_BEGIN)) { |
616 | WARN_ON(1); | |
1da177e4 | 617 | return; |
bd796ed0 | 618 | } |
1da177e4 LT |
619 | offset = virt_addr & ~PAGE_MASK; |
620 | nrpages = PAGE_ALIGN(offset + size - 1) >> PAGE_SHIFT; | |
621 | ||
1b42f516 | 622 | idx = FIX_BTMAP_BEGIN - NR_FIX_BTMAPS*nesting; |
1da177e4 | 623 | while (nrpages > 0) { |
beacfaac | 624 | early_clear_fixmap(idx); |
1da177e4 LT |
625 | --idx; |
626 | --nrpages; | |
627 | } | |
628 | } | |
1b42f516 IM |
629 | |
630 | void __this_fixmap_does_not_exist(void) | |
631 | { | |
632 | WARN_ON(1); | |
633 | } | |
240d3a7c TG |
634 | |
635 | #endif /* CONFIG_X86_32 */ |