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