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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> | |
36 | #include <linux/init.h> | |
a245067e | 37 | #include <linux/bootmem.h> |
95f72d1e | 38 | #include <linux/memblock.h> |
5a0e3ad6 | 39 | #include <linux/slab.h> |
14cf11af PM |
40 | |
41 | #include <asm/pgalloc.h> | |
42 | #include <asm/page.h> | |
43 | #include <asm/prom.h> | |
14cf11af PM |
44 | #include <asm/io.h> |
45 | #include <asm/mmu_context.h> | |
46 | #include <asm/pgtable.h> | |
47 | #include <asm/mmu.h> | |
14cf11af PM |
48 | #include <asm/smp.h> |
49 | #include <asm/machdep.h> | |
50 | #include <asm/tlb.h> | |
14cf11af | 51 | #include <asm/processor.h> |
14cf11af | 52 | #include <asm/cputable.h> |
14cf11af | 53 | #include <asm/sections.h> |
5e203d68 | 54 | #include <asm/firmware.h> |
800fc3ee DG |
55 | |
56 | #include "mmu_decl.h" | |
14cf11af | 57 | |
78f1dbde AK |
58 | /* Some sanity checking */ |
59 | #if TASK_SIZE_USER64 > PGTABLE_RANGE | |
60 | #error TASK_SIZE_USER64 exceeds pagetable range | |
61 | #endif | |
62 | ||
63 | #ifdef CONFIG_PPC_STD_MMU_64 | |
64 | #if TASK_SIZE_USER64 > (1UL << (USER_ESID_BITS + SID_SHIFT)) | |
65 | #error TASK_SIZE_USER64 exceeds user VSID range | |
66 | #endif | |
67 | #endif | |
14cf11af | 68 | |
78f1dbde | 69 | unsigned long ioremap_bot = IOREMAP_BASE; |
a245067e BH |
70 | |
71 | #ifdef CONFIG_PPC_MMU_NOHASH | |
72 | static void *early_alloc_pgtable(unsigned long size) | |
73 | { | |
74 | void *pt; | |
75 | ||
76 | if (init_bootmem_done) | |
77 | pt = __alloc_bootmem(size, size, __pa(MAX_DMA_ADDRESS)); | |
78 | else | |
95f72d1e | 79 | pt = __va(memblock_alloc_base(size, size, |
a245067e BH |
80 | __pa(MAX_DMA_ADDRESS))); |
81 | memset(pt, 0, size); | |
82 | ||
83 | return pt; | |
84 | } | |
85 | #endif /* CONFIG_PPC_MMU_NOHASH */ | |
86 | ||
14cf11af | 87 | /* |
a245067e BH |
88 | * map_kernel_page currently only called by __ioremap |
89 | * map_kernel_page adds an entry to the ioremap page table | |
14cf11af PM |
90 | * and adds an entry to the HPT, possibly bolting it |
91 | */ | |
32a74949 | 92 | int map_kernel_page(unsigned long ea, unsigned long pa, int flags) |
14cf11af PM |
93 | { |
94 | pgd_t *pgdp; | |
95 | pud_t *pudp; | |
96 | pmd_t *pmdp; | |
97 | pte_t *ptep; | |
14cf11af | 98 | |
a245067e | 99 | if (slab_is_available()) { |
14cf11af PM |
100 | pgdp = pgd_offset_k(ea); |
101 | pudp = pud_alloc(&init_mm, pgdp, ea); | |
102 | if (!pudp) | |
103 | return -ENOMEM; | |
104 | pmdp = pmd_alloc(&init_mm, pudp, ea); | |
105 | if (!pmdp) | |
106 | return -ENOMEM; | |
23fd0775 | 107 | ptep = pte_alloc_kernel(pmdp, ea); |
14cf11af PM |
108 | if (!ptep) |
109 | return -ENOMEM; | |
110 | set_pte_at(&init_mm, ea, ptep, pfn_pte(pa >> PAGE_SHIFT, | |
111 | __pgprot(flags))); | |
14cf11af | 112 | } else { |
a245067e BH |
113 | #ifdef CONFIG_PPC_MMU_NOHASH |
114 | /* Warning ! This will blow up if bootmem is not initialized | |
115 | * which our ppc64 code is keen to do that, we'll need to | |
116 | * fix it and/or be more careful | |
117 | */ | |
118 | pgdp = pgd_offset_k(ea); | |
119 | #ifdef PUD_TABLE_SIZE | |
120 | if (pgd_none(*pgdp)) { | |
121 | pudp = early_alloc_pgtable(PUD_TABLE_SIZE); | |
122 | BUG_ON(pudp == NULL); | |
123 | pgd_populate(&init_mm, pgdp, pudp); | |
124 | } | |
125 | #endif /* PUD_TABLE_SIZE */ | |
126 | pudp = pud_offset(pgdp, ea); | |
127 | if (pud_none(*pudp)) { | |
128 | pmdp = early_alloc_pgtable(PMD_TABLE_SIZE); | |
129 | BUG_ON(pmdp == NULL); | |
130 | pud_populate(&init_mm, pudp, pmdp); | |
131 | } | |
132 | pmdp = pmd_offset(pudp, ea); | |
133 | if (!pmd_present(*pmdp)) { | |
134 | ptep = early_alloc_pgtable(PAGE_SIZE); | |
135 | BUG_ON(ptep == NULL); | |
136 | pmd_populate_kernel(&init_mm, pmdp, ptep); | |
137 | } | |
138 | ptep = pte_offset_kernel(pmdp, ea); | |
139 | set_pte_at(&init_mm, ea, ptep, pfn_pte(pa >> PAGE_SHIFT, | |
140 | __pgprot(flags))); | |
141 | #else /* CONFIG_PPC_MMU_NOHASH */ | |
14cf11af PM |
142 | /* |
143 | * If the mm subsystem is not fully up, we cannot create a | |
144 | * linux page table entry for this mapping. Simply bolt an | |
145 | * entry in the hardware page table. | |
3c726f8d | 146 | * |
14cf11af | 147 | */ |
1189be65 PM |
148 | if (htab_bolt_mapping(ea, ea + PAGE_SIZE, pa, flags, |
149 | mmu_io_psize, mmu_kernel_ssize)) { | |
77ac166f BH |
150 | printk(KERN_ERR "Failed to do bolted mapping IO " |
151 | "memory at %016lx !\n", pa); | |
152 | return -ENOMEM; | |
153 | } | |
a245067e | 154 | #endif /* !CONFIG_PPC_MMU_NOHASH */ |
14cf11af PM |
155 | } |
156 | return 0; | |
157 | } | |
158 | ||
159 | ||
3d5134ee BH |
160 | /** |
161 | * __ioremap_at - Low level function to establish the page tables | |
162 | * for an IO mapping | |
163 | */ | |
164 | void __iomem * __ioremap_at(phys_addr_t pa, void *ea, unsigned long size, | |
14cf11af PM |
165 | unsigned long flags) |
166 | { | |
167 | unsigned long i; | |
168 | ||
a1f242ff | 169 | /* Make sure we have the base flags */ |
14cf11af PM |
170 | if ((flags & _PAGE_PRESENT) == 0) |
171 | flags |= pgprot_val(PAGE_KERNEL); | |
172 | ||
a1f242ff BH |
173 | /* Non-cacheable page cannot be coherent */ |
174 | if (flags & _PAGE_NO_CACHE) | |
175 | flags &= ~_PAGE_COHERENT; | |
176 | ||
177 | /* We don't support the 4K PFN hack with ioremap */ | |
178 | if (flags & _PAGE_4K_PFN) | |
179 | return NULL; | |
180 | ||
3d5134ee BH |
181 | WARN_ON(pa & ~PAGE_MASK); |
182 | WARN_ON(((unsigned long)ea) & ~PAGE_MASK); | |
183 | WARN_ON(size & ~PAGE_MASK); | |
184 | ||
14cf11af | 185 | for (i = 0; i < size; i += PAGE_SIZE) |
a245067e | 186 | if (map_kernel_page((unsigned long)ea+i, pa+i, flags)) |
14cf11af PM |
187 | return NULL; |
188 | ||
3d5134ee BH |
189 | return (void __iomem *)ea; |
190 | } | |
191 | ||
192 | /** | |
193 | * __iounmap_from - Low level function to tear down the page tables | |
194 | * for an IO mapping. This is used for mappings that | |
195 | * are manipulated manually, like partial unmapping of | |
196 | * PCI IOs or ISA space. | |
197 | */ | |
198 | void __iounmap_at(void *ea, unsigned long size) | |
199 | { | |
200 | WARN_ON(((unsigned long)ea) & ~PAGE_MASK); | |
201 | WARN_ON(size & ~PAGE_MASK); | |
202 | ||
203 | unmap_kernel_range((unsigned long)ea, size); | |
14cf11af PM |
204 | } |
205 | ||
1cdab55d BH |
206 | void __iomem * __ioremap_caller(phys_addr_t addr, unsigned long size, |
207 | unsigned long flags, void *caller) | |
14cf11af | 208 | { |
3d5134ee | 209 | phys_addr_t paligned; |
14cf11af PM |
210 | void __iomem *ret; |
211 | ||
212 | /* | |
213 | * Choose an address to map it to. | |
214 | * Once the imalloc system is running, we use it. | |
215 | * Before that, we map using addresses going | |
216 | * up from ioremap_bot. imalloc will use | |
217 | * the addresses from ioremap_bot through | |
218 | * IMALLOC_END | |
219 | * | |
220 | */ | |
3d5134ee BH |
221 | paligned = addr & PAGE_MASK; |
222 | size = PAGE_ALIGN(addr + size) - paligned; | |
14cf11af | 223 | |
3d5134ee | 224 | if ((size == 0) || (paligned == 0)) |
14cf11af PM |
225 | return NULL; |
226 | ||
227 | if (mem_init_done) { | |
228 | struct vm_struct *area; | |
3d5134ee | 229 | |
1cdab55d BH |
230 | area = __get_vm_area_caller(size, VM_IOREMAP, |
231 | ioremap_bot, IOREMAP_END, | |
232 | caller); | |
14cf11af PM |
233 | if (area == NULL) |
234 | return NULL; | |
7a9d1256 ME |
235 | |
236 | area->phys_addr = paligned; | |
3d5134ee | 237 | ret = __ioremap_at(paligned, area->addr, size, flags); |
14cf11af | 238 | if (!ret) |
3d5134ee | 239 | vunmap(area->addr); |
14cf11af | 240 | } else { |
3d5134ee | 241 | ret = __ioremap_at(paligned, (void *)ioremap_bot, size, flags); |
14cf11af PM |
242 | if (ret) |
243 | ioremap_bot += size; | |
244 | } | |
3d5134ee BH |
245 | |
246 | if (ret) | |
247 | ret += addr & ~PAGE_MASK; | |
14cf11af PM |
248 | return ret; |
249 | } | |
250 | ||
1cdab55d BH |
251 | void __iomem * __ioremap(phys_addr_t addr, unsigned long size, |
252 | unsigned long flags) | |
253 | { | |
254 | return __ioremap_caller(addr, size, flags, __builtin_return_address(0)); | |
255 | } | |
4cb3cee0 | 256 | |
68a64357 | 257 | void __iomem * ioremap(phys_addr_t addr, unsigned long size) |
4cb3cee0 BH |
258 | { |
259 | unsigned long flags = _PAGE_NO_CACHE | _PAGE_GUARDED; | |
1cdab55d | 260 | void *caller = __builtin_return_address(0); |
4cb3cee0 BH |
261 | |
262 | if (ppc_md.ioremap) | |
1cdab55d BH |
263 | return ppc_md.ioremap(addr, size, flags, caller); |
264 | return __ioremap_caller(addr, size, flags, caller); | |
4cb3cee0 BH |
265 | } |
266 | ||
be135f40 AB |
267 | void __iomem * ioremap_wc(phys_addr_t addr, unsigned long size) |
268 | { | |
269 | unsigned long flags = _PAGE_NO_CACHE; | |
270 | void *caller = __builtin_return_address(0); | |
271 | ||
272 | if (ppc_md.ioremap) | |
273 | return ppc_md.ioremap(addr, size, flags, caller); | |
274 | return __ioremap_caller(addr, size, flags, caller); | |
275 | } | |
276 | ||
40f1ce7f | 277 | void __iomem * ioremap_prot(phys_addr_t addr, unsigned long size, |
4cb3cee0 BH |
278 | unsigned long flags) |
279 | { | |
1cdab55d BH |
280 | void *caller = __builtin_return_address(0); |
281 | ||
a1f242ff BH |
282 | /* writeable implies dirty for kernel addresses */ |
283 | if (flags & _PAGE_RW) | |
284 | flags |= _PAGE_DIRTY; | |
285 | ||
286 | /* we don't want to let _PAGE_USER and _PAGE_EXEC leak out */ | |
287 | flags &= ~(_PAGE_USER | _PAGE_EXEC); | |
288 | ||
55052eec BH |
289 | #ifdef _PAGE_BAP_SR |
290 | /* _PAGE_USER contains _PAGE_BAP_SR on BookE using the new PTE format | |
291 | * which means that we just cleared supervisor access... oops ;-) This | |
292 | * restores it | |
293 | */ | |
294 | flags |= _PAGE_BAP_SR; | |
295 | #endif | |
296 | ||
4cb3cee0 | 297 | if (ppc_md.ioremap) |
1cdab55d BH |
298 | return ppc_md.ioremap(addr, size, flags, caller); |
299 | return __ioremap_caller(addr, size, flags, caller); | |
4cb3cee0 BH |
300 | } |
301 | ||
302 | ||
14cf11af PM |
303 | /* |
304 | * Unmap an IO region and remove it from imalloc'd list. | |
305 | * Access to IO memory should be serialized by driver. | |
14cf11af | 306 | */ |
68a64357 | 307 | void __iounmap(volatile void __iomem *token) |
14cf11af PM |
308 | { |
309 | void *addr; | |
310 | ||
311 | if (!mem_init_done) | |
312 | return; | |
313 | ||
3d5134ee BH |
314 | addr = (void *) ((unsigned long __force) |
315 | PCI_FIX_ADDR(token) & PAGE_MASK); | |
316 | if ((unsigned long)addr < ioremap_bot) { | |
317 | printk(KERN_WARNING "Attempt to iounmap early bolted mapping" | |
318 | " at 0x%p\n", addr); | |
319 | return; | |
320 | } | |
321 | vunmap(addr); | |
14cf11af PM |
322 | } |
323 | ||
68a64357 | 324 | void iounmap(volatile void __iomem *token) |
4cb3cee0 BH |
325 | { |
326 | if (ppc_md.iounmap) | |
327 | ppc_md.iounmap(token); | |
328 | else | |
329 | __iounmap(token); | |
330 | } | |
331 | ||
14cf11af | 332 | EXPORT_SYMBOL(ioremap); |
be135f40 | 333 | EXPORT_SYMBOL(ioremap_wc); |
40f1ce7f | 334 | EXPORT_SYMBOL(ioremap_prot); |
14cf11af | 335 | EXPORT_SYMBOL(__ioremap); |
a302cb9d | 336 | EXPORT_SYMBOL(__ioremap_at); |
14cf11af | 337 | EXPORT_SYMBOL(iounmap); |
4cb3cee0 | 338 | EXPORT_SYMBOL(__iounmap); |
a302cb9d | 339 | EXPORT_SYMBOL(__iounmap_at); |