Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 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 |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 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 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 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> |
Benjamin Herrenschmidt | a245067 | 2009-07-23 23:15:16 +0000 | [diff] [blame] | 36 | #include <linux/bootmem.h> |
| 37 | #include <linux/lmb.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame^] | 38 | #include <linux/slab.h> |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 39 | |
| 40 | #include <asm/pgalloc.h> |
| 41 | #include <asm/page.h> |
| 42 | #include <asm/prom.h> |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 43 | #include <asm/io.h> |
| 44 | #include <asm/mmu_context.h> |
| 45 | #include <asm/pgtable.h> |
| 46 | #include <asm/mmu.h> |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 47 | #include <asm/smp.h> |
| 48 | #include <asm/machdep.h> |
| 49 | #include <asm/tlb.h> |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 50 | #include <asm/processor.h> |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 51 | #include <asm/cputable.h> |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 52 | #include <asm/sections.h> |
| 53 | #include <asm/system.h> |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 54 | #include <asm/abs_addr.h> |
Stephen Rothwell | 5e203d6 | 2006-09-25 13:36:31 +1000 | [diff] [blame] | 55 | #include <asm/firmware.h> |
David Gibson | 800fc3e | 2005-11-16 15:43:48 +1100 | [diff] [blame] | 56 | |
| 57 | #include "mmu_decl.h" |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 58 | |
Benjamin Herrenschmidt | 3d5134e | 2007-06-04 15:15:36 +1000 | [diff] [blame] | 59 | unsigned long ioremap_bot = IOREMAP_BASE; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 60 | |
Benjamin Herrenschmidt | a245067 | 2009-07-23 23:15:16 +0000 | [diff] [blame] | 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 |
| 70 | pt = __va(lmb_alloc_base(size, size, |
| 71 | __pa(MAX_DMA_ADDRESS))); |
| 72 | memset(pt, 0, size); |
| 73 | |
| 74 | return pt; |
| 75 | } |
| 76 | #endif /* CONFIG_PPC_MMU_NOHASH */ |
| 77 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 78 | /* |
Benjamin Herrenschmidt | a245067 | 2009-07-23 23:15:16 +0000 | [diff] [blame] | 79 | * map_kernel_page currently only called by __ioremap |
| 80 | * map_kernel_page adds an entry to the ioremap page table |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 81 | * and adds an entry to the HPT, possibly bolting it |
| 82 | */ |
Benjamin Herrenschmidt | 32a7494 | 2009-07-23 23:15:58 +0000 | [diff] [blame] | 83 | int map_kernel_page(unsigned long ea, unsigned long pa, int flags) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 84 | { |
| 85 | pgd_t *pgdp; |
| 86 | pud_t *pudp; |
| 87 | pmd_t *pmdp; |
| 88 | pte_t *ptep; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 89 | |
Benjamin Herrenschmidt | a245067 | 2009-07-23 23:15:16 +0000 | [diff] [blame] | 90 | if (slab_is_available()) { |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 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; |
Paul Mackerras | 23fd077 | 2005-10-31 13:37:12 +1100 | [diff] [blame] | 98 | ptep = pte_alloc_kernel(pmdp, ea); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 99 | if (!ptep) |
| 100 | return -ENOMEM; |
| 101 | set_pte_at(&init_mm, ea, ptep, pfn_pte(pa >> PAGE_SHIFT, |
| 102 | __pgprot(flags))); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 103 | } else { |
Benjamin Herrenschmidt | a245067 | 2009-07-23 23:15:16 +0000 | [diff] [blame] | 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 */ |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 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. |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 137 | * |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 138 | */ |
Paul Mackerras | 1189be6 | 2007-10-11 20:37:10 +1000 | [diff] [blame] | 139 | if (htab_bolt_mapping(ea, ea + PAGE_SIZE, pa, flags, |
| 140 | mmu_io_psize, mmu_kernel_ssize)) { |
Benjamin Herrenschmidt | 77ac166 | 2005-11-10 11:12:11 +1100 | [diff] [blame] | 141 | printk(KERN_ERR "Failed to do bolted mapping IO " |
| 142 | "memory at %016lx !\n", pa); |
| 143 | return -ENOMEM; |
| 144 | } |
Benjamin Herrenschmidt | a245067 | 2009-07-23 23:15:16 +0000 | [diff] [blame] | 145 | #endif /* !CONFIG_PPC_MMU_NOHASH */ |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 146 | } |
| 147 | return 0; |
| 148 | } |
| 149 | |
| 150 | |
Benjamin Herrenschmidt | 3d5134e | 2007-06-04 15:15:36 +1000 | [diff] [blame] | 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, |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 156 | unsigned long flags) |
| 157 | { |
| 158 | unsigned long i; |
| 159 | |
Benjamin Herrenschmidt | a1f242f | 2008-07-23 21:27:08 -0700 | [diff] [blame] | 160 | /* Make sure we have the base flags */ |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 161 | if ((flags & _PAGE_PRESENT) == 0) |
| 162 | flags |= pgprot_val(PAGE_KERNEL); |
| 163 | |
Benjamin Herrenschmidt | a1f242f | 2008-07-23 21:27:08 -0700 | [diff] [blame] | 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 | |
Benjamin Herrenschmidt | 3d5134e | 2007-06-04 15:15:36 +1000 | [diff] [blame] | 172 | WARN_ON(pa & ~PAGE_MASK); |
| 173 | WARN_ON(((unsigned long)ea) & ~PAGE_MASK); |
| 174 | WARN_ON(size & ~PAGE_MASK); |
| 175 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 176 | for (i = 0; i < size; i += PAGE_SIZE) |
Benjamin Herrenschmidt | a245067 | 2009-07-23 23:15:16 +0000 | [diff] [blame] | 177 | if (map_kernel_page((unsigned long)ea+i, pa+i, flags)) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 178 | return NULL; |
| 179 | |
Benjamin Herrenschmidt | 3d5134e | 2007-06-04 15:15:36 +1000 | [diff] [blame] | 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); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 195 | } |
| 196 | |
Benjamin Herrenschmidt | 1cdab55 | 2009-02-22 16:19:14 +0000 | [diff] [blame] | 197 | void __iomem * __ioremap_caller(phys_addr_t addr, unsigned long size, |
| 198 | unsigned long flags, void *caller) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 199 | { |
Benjamin Herrenschmidt | 3d5134e | 2007-06-04 15:15:36 +1000 | [diff] [blame] | 200 | phys_addr_t paligned; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 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 | */ |
Benjamin Herrenschmidt | 3d5134e | 2007-06-04 15:15:36 +1000 | [diff] [blame] | 212 | paligned = addr & PAGE_MASK; |
| 213 | size = PAGE_ALIGN(addr + size) - paligned; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 214 | |
Benjamin Herrenschmidt | 3d5134e | 2007-06-04 15:15:36 +1000 | [diff] [blame] | 215 | if ((size == 0) || (paligned == 0)) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 216 | return NULL; |
| 217 | |
| 218 | if (mem_init_done) { |
| 219 | struct vm_struct *area; |
Benjamin Herrenschmidt | 3d5134e | 2007-06-04 15:15:36 +1000 | [diff] [blame] | 220 | |
Benjamin Herrenschmidt | 1cdab55 | 2009-02-22 16:19:14 +0000 | [diff] [blame] | 221 | area = __get_vm_area_caller(size, VM_IOREMAP, |
| 222 | ioremap_bot, IOREMAP_END, |
| 223 | caller); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 224 | if (area == NULL) |
| 225 | return NULL; |
Benjamin Herrenschmidt | 3d5134e | 2007-06-04 15:15:36 +1000 | [diff] [blame] | 226 | ret = __ioremap_at(paligned, area->addr, size, flags); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 227 | if (!ret) |
Benjamin Herrenschmidt | 3d5134e | 2007-06-04 15:15:36 +1000 | [diff] [blame] | 228 | vunmap(area->addr); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 229 | } else { |
Benjamin Herrenschmidt | 3d5134e | 2007-06-04 15:15:36 +1000 | [diff] [blame] | 230 | ret = __ioremap_at(paligned, (void *)ioremap_bot, size, flags); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 231 | if (ret) |
| 232 | ioremap_bot += size; |
| 233 | } |
Benjamin Herrenschmidt | 3d5134e | 2007-06-04 15:15:36 +1000 | [diff] [blame] | 234 | |
| 235 | if (ret) |
| 236 | ret += addr & ~PAGE_MASK; |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 237 | return ret; |
| 238 | } |
| 239 | |
Benjamin Herrenschmidt | 1cdab55 | 2009-02-22 16:19:14 +0000 | [diff] [blame] | 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 | } |
Benjamin Herrenschmidt | 4cb3cee | 2006-11-11 17:25:10 +1100 | [diff] [blame] | 245 | |
Benjamin Herrenschmidt | 68a6435 | 2006-11-13 09:27:39 +1100 | [diff] [blame] | 246 | void __iomem * ioremap(phys_addr_t addr, unsigned long size) |
Benjamin Herrenschmidt | 4cb3cee | 2006-11-11 17:25:10 +1100 | [diff] [blame] | 247 | { |
| 248 | unsigned long flags = _PAGE_NO_CACHE | _PAGE_GUARDED; |
Benjamin Herrenschmidt | 1cdab55 | 2009-02-22 16:19:14 +0000 | [diff] [blame] | 249 | void *caller = __builtin_return_address(0); |
Benjamin Herrenschmidt | 4cb3cee | 2006-11-11 17:25:10 +1100 | [diff] [blame] | 250 | |
| 251 | if (ppc_md.ioremap) |
Benjamin Herrenschmidt | 1cdab55 | 2009-02-22 16:19:14 +0000 | [diff] [blame] | 252 | return ppc_md.ioremap(addr, size, flags, caller); |
| 253 | return __ioremap_caller(addr, size, flags, caller); |
Benjamin Herrenschmidt | 4cb3cee | 2006-11-11 17:25:10 +1100 | [diff] [blame] | 254 | } |
| 255 | |
Benjamin Herrenschmidt | 68a6435 | 2006-11-13 09:27:39 +1100 | [diff] [blame] | 256 | void __iomem * ioremap_flags(phys_addr_t addr, unsigned long size, |
Benjamin Herrenschmidt | 4cb3cee | 2006-11-11 17:25:10 +1100 | [diff] [blame] | 257 | unsigned long flags) |
| 258 | { |
Benjamin Herrenschmidt | 1cdab55 | 2009-02-22 16:19:14 +0000 | [diff] [blame] | 259 | void *caller = __builtin_return_address(0); |
| 260 | |
Benjamin Herrenschmidt | a1f242f | 2008-07-23 21:27:08 -0700 | [diff] [blame] | 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 | |
Benjamin Herrenschmidt | 4cb3cee | 2006-11-11 17:25:10 +1100 | [diff] [blame] | 268 | if (ppc_md.ioremap) |
Benjamin Herrenschmidt | 1cdab55 | 2009-02-22 16:19:14 +0000 | [diff] [blame] | 269 | return ppc_md.ioremap(addr, size, flags, caller); |
| 270 | return __ioremap_caller(addr, size, flags, caller); |
Benjamin Herrenschmidt | 4cb3cee | 2006-11-11 17:25:10 +1100 | [diff] [blame] | 271 | } |
| 272 | |
| 273 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 274 | /* |
| 275 | * Unmap an IO region and remove it from imalloc'd list. |
| 276 | * Access to IO memory should be serialized by driver. |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 277 | */ |
Benjamin Herrenschmidt | 68a6435 | 2006-11-13 09:27:39 +1100 | [diff] [blame] | 278 | void __iounmap(volatile void __iomem *token) |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 279 | { |
| 280 | void *addr; |
| 281 | |
| 282 | if (!mem_init_done) |
| 283 | return; |
| 284 | |
Benjamin Herrenschmidt | 3d5134e | 2007-06-04 15:15:36 +1000 | [diff] [blame] | 285 | addr = (void *) ((unsigned long __force) |
| 286 | PCI_FIX_ADDR(token) & PAGE_MASK); |
| 287 | if ((unsigned long)addr < ioremap_bot) { |
| 288 | printk(KERN_WARNING "Attempt to iounmap early bolted mapping" |
| 289 | " at 0x%p\n", addr); |
| 290 | return; |
| 291 | } |
| 292 | vunmap(addr); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 293 | } |
| 294 | |
Benjamin Herrenschmidt | 68a6435 | 2006-11-13 09:27:39 +1100 | [diff] [blame] | 295 | void iounmap(volatile void __iomem *token) |
Benjamin Herrenschmidt | 4cb3cee | 2006-11-11 17:25:10 +1100 | [diff] [blame] | 296 | { |
| 297 | if (ppc_md.iounmap) |
| 298 | ppc_md.iounmap(token); |
| 299 | else |
| 300 | __iounmap(token); |
| 301 | } |
| 302 | |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 303 | EXPORT_SYMBOL(ioremap); |
Benjamin Herrenschmidt | 4cb3cee | 2006-11-11 17:25:10 +1100 | [diff] [blame] | 304 | EXPORT_SYMBOL(ioremap_flags); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 305 | EXPORT_SYMBOL(__ioremap); |
Olof Johansson | a302cb9 | 2007-08-31 13:58:51 +1000 | [diff] [blame] | 306 | EXPORT_SYMBOL(__ioremap_at); |
Paul Mackerras | 14cf11a | 2005-09-26 16:04:21 +1000 | [diff] [blame] | 307 | EXPORT_SYMBOL(iounmap); |
Benjamin Herrenschmidt | 4cb3cee | 2006-11-11 17:25:10 +1100 | [diff] [blame] | 308 | EXPORT_SYMBOL(__iounmap); |
Olof Johansson | a302cb9 | 2007-08-31 13:58:51 +1000 | [diff] [blame] | 309 | EXPORT_SYMBOL(__iounmap_at); |