Commit | Line | Data |
---|---|---|
14cf11af PM |
1 | /* |
2 | * This file contains ioremap and related functions for 64-bit machines. | |
3 | * | |
4 | * Derived from arch/ppc64/mm/init.c | |
5 | * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) | |
6 | * | |
7 | * Modifications by Paul Mackerras (PowerMac) (paulus@samba.org) | |
8 | * and Cort Dougan (PReP) (cort@cs.nmt.edu) | |
9 | * Copyright (C) 1996 Paul Mackerras | |
14cf11af PM |
10 | * |
11 | * Derived from "arch/i386/mm/init.c" | |
12 | * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds | |
13 | * | |
14 | * Dave Engebretsen <engebret@us.ibm.com> | |
15 | * Rework for PPC64 port. | |
16 | * | |
17 | * This program is free software; you can redistribute it and/or | |
18 | * modify it under the terms of the GNU General Public License | |
19 | * as published by the Free Software Foundation; either version | |
20 | * 2 of the License, or (at your option) any later version. | |
21 | * | |
22 | */ | |
23 | ||
14cf11af PM |
24 | #include <linux/signal.h> |
25 | #include <linux/sched.h> | |
26 | #include <linux/kernel.h> | |
27 | #include <linux/errno.h> | |
28 | #include <linux/string.h> | |
66b15db6 | 29 | #include <linux/export.h> |
14cf11af PM |
30 | #include <linux/types.h> |
31 | #include <linux/mman.h> | |
32 | #include <linux/mm.h> | |
33 | #include <linux/swap.h> | |
34 | #include <linux/stddef.h> | |
35 | #include <linux/vmalloc.h> | |
5a0e3ad6 | 36 | #include <linux/slab.h> |
06743521 | 37 | #include <linux/hugetlb.h> |
14cf11af PM |
38 | |
39 | #include <asm/pgalloc.h> | |
40 | #include <asm/page.h> | |
41 | #include <asm/prom.h> | |
14cf11af PM |
42 | #include <asm/io.h> |
43 | #include <asm/mmu_context.h> | |
44 | #include <asm/pgtable.h> | |
45 | #include <asm/mmu.h> | |
14cf11af PM |
46 | #include <asm/smp.h> |
47 | #include <asm/machdep.h> | |
48 | #include <asm/tlb.h> | |
14cf11af | 49 | #include <asm/processor.h> |
14cf11af | 50 | #include <asm/cputable.h> |
14cf11af | 51 | #include <asm/sections.h> |
5e203d68 | 52 | #include <asm/firmware.h> |
68cf0d64 | 53 | #include <asm/dma.h> |
800fc3ee DG |
54 | |
55 | #include "mmu_decl.h" | |
14cf11af | 56 | |
14cf11af | 57 | |
50de596d AK |
58 | #ifdef CONFIG_PPC_BOOK3S_64 |
59 | /* | |
60 | * partition table and process table for ISA 3.0 | |
61 | */ | |
62 | struct prtb_entry *process_tb; | |
63 | struct patb_entry *partition_tb; | |
dd1842a2 AK |
64 | /* |
65 | * page table size | |
66 | */ | |
67 | unsigned long __pte_index_size; | |
68 | EXPORT_SYMBOL(__pte_index_size); | |
69 | unsigned long __pmd_index_size; | |
70 | EXPORT_SYMBOL(__pmd_index_size); | |
71 | unsigned long __pud_index_size; | |
72 | EXPORT_SYMBOL(__pud_index_size); | |
73 | unsigned long __pgd_index_size; | |
74 | EXPORT_SYMBOL(__pgd_index_size); | |
fae22116 AK |
75 | unsigned long __pud_cache_index; |
76 | EXPORT_SYMBOL(__pud_cache_index); | |
dd1842a2 AK |
77 | unsigned long __pte_table_size; |
78 | EXPORT_SYMBOL(__pte_table_size); | |
79 | unsigned long __pmd_table_size; | |
80 | EXPORT_SYMBOL(__pmd_table_size); | |
81 | unsigned long __pud_table_size; | |
82 | EXPORT_SYMBOL(__pud_table_size); | |
83 | unsigned long __pgd_table_size; | |
84 | EXPORT_SYMBOL(__pgd_table_size); | |
a2f41eb9 AK |
85 | unsigned long __pmd_val_bits; |
86 | EXPORT_SYMBOL(__pmd_val_bits); | |
87 | unsigned long __pud_val_bits; | |
88 | EXPORT_SYMBOL(__pud_val_bits); | |
89 | unsigned long __pgd_val_bits; | |
90 | EXPORT_SYMBOL(__pgd_val_bits); | |
d6a9996e AK |
91 | unsigned long __kernel_virt_start; |
92 | EXPORT_SYMBOL(__kernel_virt_start); | |
93 | unsigned long __kernel_virt_size; | |
94 | EXPORT_SYMBOL(__kernel_virt_size); | |
95 | unsigned long __vmalloc_start; | |
96 | EXPORT_SYMBOL(__vmalloc_start); | |
97 | unsigned long __vmalloc_end; | |
98 | EXPORT_SYMBOL(__vmalloc_end); | |
63ee9b2f ME |
99 | unsigned long __kernel_io_start; |
100 | EXPORT_SYMBOL(__kernel_io_start); | |
d6a9996e AK |
101 | struct page *vmemmap; |
102 | EXPORT_SYMBOL(vmemmap); | |
5ed7ecd0 AK |
103 | unsigned long __pte_frag_nr; |
104 | EXPORT_SYMBOL(__pte_frag_nr); | |
105 | unsigned long __pte_frag_size_shift; | |
106 | EXPORT_SYMBOL(__pte_frag_size_shift); | |
d6a9996e AK |
107 | unsigned long ioremap_bot; |
108 | #else /* !CONFIG_PPC_BOOK3S_64 */ | |
78f1dbde | 109 | unsigned long ioremap_bot = IOREMAP_BASE; |
d6a9996e | 110 | #endif |
a245067e | 111 | |
3d5134ee BH |
112 | /** |
113 | * __ioremap_at - Low level function to establish the page tables | |
114 | * for an IO mapping | |
115 | */ | |
c766ee72 | 116 | void __iomem *__ioremap_at(phys_addr_t pa, void *ea, unsigned long size, pgprot_t prot) |
14cf11af PM |
117 | { |
118 | unsigned long i; | |
119 | ||
a1f242ff | 120 | /* We don't support the 4K PFN hack with ioremap */ |
c766ee72 | 121 | if (pgprot_val(prot) & H_PAGE_4K_PFN) |
a1f242ff BH |
122 | return NULL; |
123 | ||
3d5134ee BH |
124 | WARN_ON(pa & ~PAGE_MASK); |
125 | WARN_ON(((unsigned long)ea) & ~PAGE_MASK); | |
126 | WARN_ON(size & ~PAGE_MASK); | |
127 | ||
14cf11af | 128 | for (i = 0; i < size; i += PAGE_SIZE) |
c766ee72 | 129 | if (map_kernel_page((unsigned long)ea + i, pa + i, prot)) |
14cf11af PM |
130 | return NULL; |
131 | ||
3d5134ee BH |
132 | return (void __iomem *)ea; |
133 | } | |
134 | ||
135 | /** | |
136 | * __iounmap_from - Low level function to tear down the page tables | |
137 | * for an IO mapping. This is used for mappings that | |
138 | * are manipulated manually, like partial unmapping of | |
139 | * PCI IOs or ISA space. | |
140 | */ | |
141 | void __iounmap_at(void *ea, unsigned long size) | |
142 | { | |
143 | WARN_ON(((unsigned long)ea) & ~PAGE_MASK); | |
144 | WARN_ON(size & ~PAGE_MASK); | |
145 | ||
146 | unmap_kernel_range((unsigned long)ea, size); | |
14cf11af PM |
147 | } |
148 | ||
1cdab55d | 149 | void __iomem * __ioremap_caller(phys_addr_t addr, unsigned long size, |
c766ee72 | 150 | pgprot_t prot, void *caller) |
14cf11af | 151 | { |
3d5134ee | 152 | phys_addr_t paligned; |
14cf11af PM |
153 | void __iomem *ret; |
154 | ||
155 | /* | |
156 | * Choose an address to map it to. | |
157 | * Once the imalloc system is running, we use it. | |
158 | * Before that, we map using addresses going | |
159 | * up from ioremap_bot. imalloc will use | |
160 | * the addresses from ioremap_bot through | |
161 | * IMALLOC_END | |
162 | * | |
163 | */ | |
3d5134ee BH |
164 | paligned = addr & PAGE_MASK; |
165 | size = PAGE_ALIGN(addr + size) - paligned; | |
14cf11af | 166 | |
3d5134ee | 167 | if ((size == 0) || (paligned == 0)) |
14cf11af PM |
168 | return NULL; |
169 | ||
f691fa10 | 170 | if (slab_is_available()) { |
14cf11af | 171 | struct vm_struct *area; |
3d5134ee | 172 | |
1cdab55d BH |
173 | area = __get_vm_area_caller(size, VM_IOREMAP, |
174 | ioremap_bot, IOREMAP_END, | |
175 | caller); | |
14cf11af PM |
176 | if (area == NULL) |
177 | return NULL; | |
7a9d1256 ME |
178 | |
179 | area->phys_addr = paligned; | |
c766ee72 | 180 | ret = __ioremap_at(paligned, area->addr, size, prot); |
14cf11af | 181 | if (!ret) |
3d5134ee | 182 | vunmap(area->addr); |
14cf11af | 183 | } else { |
c766ee72 | 184 | ret = __ioremap_at(paligned, (void *)ioremap_bot, size, prot); |
14cf11af PM |
185 | if (ret) |
186 | ioremap_bot += size; | |
187 | } | |
3d5134ee BH |
188 | |
189 | if (ret) | |
190 | ret += addr & ~PAGE_MASK; | |
14cf11af PM |
191 | return ret; |
192 | } | |
193 | ||
1cdab55d BH |
194 | void __iomem * __ioremap(phys_addr_t addr, unsigned long size, |
195 | unsigned long flags) | |
196 | { | |
c766ee72 | 197 | return __ioremap_caller(addr, size, __pgprot(flags), __builtin_return_address(0)); |
1cdab55d | 198 | } |
4cb3cee0 | 199 | |
68a64357 | 200 | void __iomem * ioremap(phys_addr_t addr, unsigned long size) |
4cb3cee0 | 201 | { |
c766ee72 | 202 | pgprot_t prot = pgprot_noncached(PAGE_KERNEL); |
1cdab55d | 203 | void *caller = __builtin_return_address(0); |
4cb3cee0 BH |
204 | |
205 | if (ppc_md.ioremap) | |
c766ee72 CL |
206 | return ppc_md.ioremap(addr, size, prot, caller); |
207 | return __ioremap_caller(addr, size, prot, caller); | |
4cb3cee0 BH |
208 | } |
209 | ||
be135f40 AB |
210 | void __iomem * ioremap_wc(phys_addr_t addr, unsigned long size) |
211 | { | |
c766ee72 | 212 | pgprot_t prot = pgprot_noncached_wc(PAGE_KERNEL); |
be135f40 AB |
213 | void *caller = __builtin_return_address(0); |
214 | ||
215 | if (ppc_md.ioremap) | |
c766ee72 CL |
216 | return ppc_md.ioremap(addr, size, prot, caller); |
217 | return __ioremap_caller(addr, size, prot, caller); | |
be135f40 AB |
218 | } |
219 | ||
86c391bd CL |
220 | void __iomem *ioremap_coherent(phys_addr_t addr, unsigned long size) |
221 | { | |
c766ee72 | 222 | pgprot_t prot = pgprot_cached(PAGE_KERNEL); |
86c391bd CL |
223 | void *caller = __builtin_return_address(0); |
224 | ||
225 | if (ppc_md.ioremap) | |
c766ee72 CL |
226 | return ppc_md.ioremap(addr, size, prot, caller); |
227 | return __ioremap_caller(addr, size, prot, caller); | |
86c391bd CL |
228 | } |
229 | ||
40f1ce7f | 230 | void __iomem * ioremap_prot(phys_addr_t addr, unsigned long size, |
4cb3cee0 BH |
231 | unsigned long flags) |
232 | { | |
26973fa5 | 233 | pte_t pte = __pte(flags); |
1cdab55d BH |
234 | void *caller = __builtin_return_address(0); |
235 | ||
a1f242ff | 236 | /* writeable implies dirty for kernel addresses */ |
26973fa5 CL |
237 | if (pte_write(pte)) |
238 | pte = pte_mkdirty(pte); | |
a1f242ff | 239 | |
ac29c640 | 240 | /* we don't want to let _PAGE_EXEC leak out */ |
26973fa5 | 241 | pte = pte_exprotect(pte); |
ac29c640 AK |
242 | /* |
243 | * Force kernel mapping. | |
244 | */ | |
26973fa5 | 245 | pte = pte_mkprivileged(pte); |
55052eec | 246 | |
4cb3cee0 | 247 | if (ppc_md.ioremap) |
26973fa5 CL |
248 | return ppc_md.ioremap(addr, size, pte_pgprot(pte), caller); |
249 | return __ioremap_caller(addr, size, pte_pgprot(pte), caller); | |
4cb3cee0 BH |
250 | } |
251 | ||
252 | ||
14cf11af PM |
253 | /* |
254 | * Unmap an IO region and remove it from imalloc'd list. | |
255 | * Access to IO memory should be serialized by driver. | |
14cf11af | 256 | */ |
68a64357 | 257 | void __iounmap(volatile void __iomem *token) |
14cf11af PM |
258 | { |
259 | void *addr; | |
260 | ||
f691fa10 | 261 | if (!slab_is_available()) |
14cf11af PM |
262 | return; |
263 | ||
3d5134ee BH |
264 | addr = (void *) ((unsigned long __force) |
265 | PCI_FIX_ADDR(token) & PAGE_MASK); | |
266 | if ((unsigned long)addr < ioremap_bot) { | |
267 | printk(KERN_WARNING "Attempt to iounmap early bolted mapping" | |
268 | " at 0x%p\n", addr); | |
269 | return; | |
270 | } | |
271 | vunmap(addr); | |
14cf11af PM |
272 | } |
273 | ||
68a64357 | 274 | void iounmap(volatile void __iomem *token) |
4cb3cee0 BH |
275 | { |
276 | if (ppc_md.iounmap) | |
277 | ppc_md.iounmap(token); | |
278 | else | |
279 | __iounmap(token); | |
280 | } | |
281 | ||
14cf11af | 282 | EXPORT_SYMBOL(ioremap); |
be135f40 | 283 | EXPORT_SYMBOL(ioremap_wc); |
40f1ce7f | 284 | EXPORT_SYMBOL(ioremap_prot); |
14cf11af | 285 | EXPORT_SYMBOL(__ioremap); |
a302cb9d | 286 | EXPORT_SYMBOL(__ioremap_at); |
14cf11af | 287 | EXPORT_SYMBOL(iounmap); |
4cb3cee0 | 288 | EXPORT_SYMBOL(__iounmap); |
a302cb9d | 289 | EXPORT_SYMBOL(__iounmap_at); |
5c1f6ee9 | 290 | |
06743521 AK |
291 | #ifndef __PAGETABLE_PUD_FOLDED |
292 | /* 4 level page table */ | |
293 | struct page *pgd_page(pgd_t pgd) | |
294 | { | |
295 | if (pgd_huge(pgd)) | |
296 | return pte_page(pgd_pte(pgd)); | |
297 | return virt_to_page(pgd_page_vaddr(pgd)); | |
298 | } | |
299 | #endif | |
300 | ||
301 | struct page *pud_page(pud_t pud) | |
302 | { | |
303 | if (pud_huge(pud)) | |
304 | return pte_page(pud_pte(pud)); | |
305 | return virt_to_page(pud_page_vaddr(pud)); | |
306 | } | |
307 | ||
074c2eae AK |
308 | /* |
309 | * For hugepage we have pfn in the pmd, we use PTE_RPN_SHIFT bits for flags | |
310 | * For PTE page, we have a PTE_FRAG_SIZE (4K) aligned virtual address. | |
311 | */ | |
312 | struct page *pmd_page(pmd_t pmd) | |
313 | { | |
ae28f17b | 314 | if (pmd_large(pmd) || pmd_huge(pmd) || pmd_devmap(pmd)) |
e34aa03c | 315 | return pte_page(pmd_pte(pmd)); |
074c2eae AK |
316 | return virt_to_page(pmd_page_vaddr(pmd)); |
317 | } | |
318 | ||
cd65d697 BS |
319 | #ifdef CONFIG_STRICT_KERNEL_RWX |
320 | void mark_rodata_ro(void) | |
321 | { | |
322 | if (!mmu_has_feature(MMU_FTR_KERNEL_RO)) { | |
323 | pr_warn("Warning: Unable to mark rodata read only on this CPU.\n"); | |
324 | return; | |
325 | } | |
326 | ||
7614ff32 BS |
327 | if (radix_enabled()) |
328 | radix__mark_rodata_ro(); | |
329 | else | |
cd65d697 BS |
330 | hash__mark_rodata_ro(); |
331 | } | |
029d9252 ME |
332 | |
333 | void mark_initmem_nx(void) | |
334 | { | |
335 | if (radix_enabled()) | |
336 | radix__mark_initmem_nx(); | |
337 | else | |
338 | hash__mark_initmem_nx(); | |
339 | } | |
cd65d697 | 340 | #endif |