Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Thomas Gleixner | e9332ca | 2008-01-30 13:34:05 +0100 | [diff] [blame] | 9 | #include <linux/bootmem.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | #include <linux/init.h> |
Haavard Skinnemoen | a148ecf | 2006-09-30 23:29:17 -0700 | [diff] [blame] | 11 | #include <linux/io.h> |
Thomas Gleixner | 3cbd09e | 2008-01-30 13:34:05 +0100 | [diff] [blame] | 12 | #include <linux/module.h> |
| 13 | #include <linux/slab.h> |
| 14 | #include <linux/vmalloc.h> |
Pekka Paalanen | d61fc44 | 2008-05-12 21:20:57 +0200 | [diff] [blame] | 15 | #include <linux/mmiotrace.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | |
Thomas Gleixner | 3cbd09e | 2008-01-30 13:34:05 +0100 | [diff] [blame] | 17 | #include <asm/cacheflush.h> |
| 18 | #include <asm/e820.h> |
| 19 | #include <asm/fixmap.h> |
| 20 | #include <asm/pgtable.h> |
| 21 | #include <asm/tlbflush.h> |
Jeremy Fitzhardinge | f6df72e | 2008-01-30 13:34:11 +0100 | [diff] [blame] | 22 | #include <asm/pgalloc.h> |
venkatesh.pallipadi@intel.com | d7677d4 | 2008-03-18 17:00:17 -0700 | [diff] [blame] | 23 | #include <asm/pat.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | |
Thomas Gleixner | 240d3a7 | 2008-01-30 13:34:05 +0100 | [diff] [blame] | 25 | #ifdef CONFIG_X86_64 |
| 26 | |
Thomas Gleixner | e3100c8 | 2008-02-27 20:57:40 +0100 | [diff] [blame] | 27 | static inline int phys_addr_valid(unsigned long addr) |
| 28 | { |
| 29 | return addr < (1UL << boot_cpu_data.x86_phys_bits); |
| 30 | } |
| 31 | |
Jiri Slaby | 59ea746 | 2008-06-12 13:56:40 +0200 | [diff] [blame] | 32 | unsigned long __phys_addr(unsigned long x) |
| 33 | { |
| 34 | if (x >= __START_KERNEL_map) { |
| 35 | x -= __START_KERNEL_map; |
| 36 | VIRTUAL_BUG_ON(x >= KERNEL_IMAGE_SIZE); |
| 37 | x += phys_base; |
| 38 | } else { |
| 39 | VIRTUAL_BUG_ON(x < PAGE_OFFSET); |
| 40 | x -= PAGE_OFFSET; |
| 41 | VIRTUAL_BUG_ON(system_state == SYSTEM_BOOTING ? x > MAXMEM : |
| 42 | !phys_addr_valid(x)); |
| 43 | } |
| 44 | return x; |
| 45 | } |
| 46 | EXPORT_SYMBOL(__phys_addr); |
| 47 | |
Vegard Nossum | af5c2bd | 2008-10-03 17:54:25 +0200 | [diff] [blame] | 48 | bool __virt_addr_valid(unsigned long x) |
| 49 | { |
| 50 | if (x >= __START_KERNEL_map) { |
| 51 | x -= __START_KERNEL_map; |
| 52 | if (x >= KERNEL_IMAGE_SIZE) |
| 53 | return false; |
| 54 | x += phys_base; |
| 55 | } else { |
| 56 | if (x < PAGE_OFFSET) |
| 57 | return false; |
| 58 | x -= PAGE_OFFSET; |
| 59 | if (system_state == SYSTEM_BOOTING ? |
| 60 | x > MAXMEM : !phys_addr_valid(x)) { |
| 61 | return false; |
| 62 | } |
| 63 | } |
| 64 | |
| 65 | return pfn_valid(x >> PAGE_SHIFT); |
| 66 | } |
| 67 | EXPORT_SYMBOL(__virt_addr_valid); |
| 68 | |
Thomas Gleixner | e3100c8 | 2008-02-27 20:57:40 +0100 | [diff] [blame] | 69 | #else |
| 70 | |
| 71 | static inline int phys_addr_valid(unsigned long addr) |
| 72 | { |
| 73 | return 1; |
| 74 | } |
| 75 | |
Jiri Slaby | a1bf963 | 2008-06-12 13:56:40 +0200 | [diff] [blame] | 76 | #ifdef CONFIG_DEBUG_VIRTUAL |
Jiri Slaby | 59ea746 | 2008-06-12 13:56:40 +0200 | [diff] [blame] | 77 | unsigned long __phys_addr(unsigned long x) |
| 78 | { |
| 79 | /* VMALLOC_* aren't constants; not available at the boot time */ |
Vegard Nossum | af5c2bd | 2008-10-03 17:54:25 +0200 | [diff] [blame] | 80 | VIRTUAL_BUG_ON(x < PAGE_OFFSET); |
| 81 | VIRTUAL_BUG_ON(system_state != SYSTEM_BOOTING && |
| 82 | is_vmalloc_addr((void *) x)); |
Jiri Slaby | 59ea746 | 2008-06-12 13:56:40 +0200 | [diff] [blame] | 83 | return x - PAGE_OFFSET; |
| 84 | } |
| 85 | EXPORT_SYMBOL(__phys_addr); |
Jiri Slaby | a1bf963 | 2008-06-12 13:56:40 +0200 | [diff] [blame] | 86 | #endif |
Jiri Slaby | 59ea746 | 2008-06-12 13:56:40 +0200 | [diff] [blame] | 87 | |
Vegard Nossum | af5c2bd | 2008-10-03 17:54:25 +0200 | [diff] [blame] | 88 | bool __virt_addr_valid(unsigned long x) |
| 89 | { |
| 90 | if (x < PAGE_OFFSET) |
| 91 | return false; |
| 92 | if (system_state != SYSTEM_BOOTING && is_vmalloc_addr((void *) x)) |
| 93 | return false; |
| 94 | return pfn_valid((x - PAGE_OFFSET) >> PAGE_SHIFT); |
| 95 | } |
| 96 | EXPORT_SYMBOL(__virt_addr_valid); |
| 97 | |
Thomas Gleixner | 240d3a7 | 2008-01-30 13:34:05 +0100 | [diff] [blame] | 98 | #endif |
| 99 | |
Thomas Gleixner | 5f5192b | 2008-01-30 13:34:06 +0100 | [diff] [blame] | 100 | int page_is_ram(unsigned long pagenr) |
| 101 | { |
Ingo Molnar | 756a6c6 | 2008-03-25 08:31:17 +0100 | [diff] [blame] | 102 | resource_size_t addr, end; |
Thomas Gleixner | 5f5192b | 2008-01-30 13:34:06 +0100 | [diff] [blame] | 103 | int i; |
| 104 | |
Arjan van de Ven | d8a9e6a | 2008-02-18 09:54:33 -0800 | [diff] [blame] | 105 | /* |
| 106 | * A special case is the first 4Kb of memory; |
| 107 | * This is a BIOS owned area, not kernel ram, but generally |
| 108 | * not listed as such in the E820 table. |
| 109 | */ |
| 110 | if (pagenr == 0) |
| 111 | return 0; |
| 112 | |
Arjan van de Ven | 156fbc3 | 2008-02-18 09:58:45 -0800 | [diff] [blame] | 113 | /* |
| 114 | * Second special case: Some BIOSen report the PC BIOS |
| 115 | * area (640->1Mb) as ram even though it is not. |
| 116 | */ |
| 117 | if (pagenr >= (BIOS_BEGIN >> PAGE_SHIFT) && |
| 118 | pagenr < (BIOS_END >> PAGE_SHIFT)) |
| 119 | return 0; |
Arjan van de Ven | d8a9e6a | 2008-02-18 09:54:33 -0800 | [diff] [blame] | 120 | |
Thomas Gleixner | 5f5192b | 2008-01-30 13:34:06 +0100 | [diff] [blame] | 121 | for (i = 0; i < e820.nr_map; i++) { |
| 122 | /* |
| 123 | * Not usable memory: |
| 124 | */ |
| 125 | if (e820.map[i].type != E820_RAM) |
| 126 | continue; |
Thomas Gleixner | 5f5192b | 2008-01-30 13:34:06 +0100 | [diff] [blame] | 127 | addr = (e820.map[i].addr + PAGE_SIZE-1) >> PAGE_SHIFT; |
| 128 | end = (e820.map[i].addr + e820.map[i].size) >> PAGE_SHIFT; |
Thomas Gleixner | 950f9d9 | 2008-01-30 13:34:06 +0100 | [diff] [blame] | 129 | |
Thomas Gleixner | 950f9d9 | 2008-01-30 13:34:06 +0100 | [diff] [blame] | 130 | |
Thomas Gleixner | 5f5192b | 2008-01-30 13:34:06 +0100 | [diff] [blame] | 131 | if ((pagenr >= addr) && (pagenr < end)) |
| 132 | return 1; |
| 133 | } |
| 134 | return 0; |
| 135 | } |
| 136 | |
Suresh Siddha | 9542ada | 2008-09-24 08:53:33 -0700 | [diff] [blame] | 137 | int pagerange_is_ram(unsigned long start, unsigned long end) |
| 138 | { |
| 139 | int ram_page = 0, not_rampage = 0; |
| 140 | unsigned long page_nr; |
| 141 | |
| 142 | for (page_nr = (start >> PAGE_SHIFT); page_nr < (end >> PAGE_SHIFT); |
| 143 | ++page_nr) { |
| 144 | if (page_is_ram(page_nr)) |
| 145 | ram_page = 1; |
| 146 | else |
| 147 | not_rampage = 1; |
| 148 | |
| 149 | if (ram_page == not_rampage) |
| 150 | return -1; |
| 151 | } |
| 152 | |
| 153 | return ram_page; |
| 154 | } |
| 155 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | /* |
Thomas Gleixner | e9332ca | 2008-01-30 13:34:05 +0100 | [diff] [blame] | 157 | * Fix up the linear direct mapping of the kernel to avoid cache attribute |
| 158 | * conflicts. |
| 159 | */ |
venkatesh.pallipadi@intel.com | 3a96ce8 | 2008-03-18 17:00:16 -0700 | [diff] [blame] | 160 | int ioremap_change_attr(unsigned long vaddr, unsigned long size, |
| 161 | unsigned long prot_val) |
Thomas Gleixner | e9332ca | 2008-01-30 13:34:05 +0100 | [diff] [blame] | 162 | { |
Thomas Gleixner | d806e5e | 2008-01-30 13:34:06 +0100 | [diff] [blame] | 163 | unsigned long nrpages = size >> PAGE_SHIFT; |
Harvey Harrison | 93809be | 2008-02-01 17:49:43 +0100 | [diff] [blame] | 164 | int err; |
Thomas Gleixner | e9332ca | 2008-01-30 13:34:05 +0100 | [diff] [blame] | 165 | |
venkatesh.pallipadi@intel.com | 3a96ce8 | 2008-03-18 17:00:16 -0700 | [diff] [blame] | 166 | switch (prot_val) { |
| 167 | case _PAGE_CACHE_UC: |
Thomas Gleixner | d806e5e | 2008-01-30 13:34:06 +0100 | [diff] [blame] | 168 | default: |
venkatesh.pallipadi@intel.com | 1219333 | 2008-03-18 17:00:18 -0700 | [diff] [blame] | 169 | err = _set_memory_uc(vaddr, nrpages); |
Thomas Gleixner | d806e5e | 2008-01-30 13:34:06 +0100 | [diff] [blame] | 170 | break; |
venkatesh.pallipadi@intel.com | b310f381d | 2008-03-18 17:00:24 -0700 | [diff] [blame] | 171 | case _PAGE_CACHE_WC: |
| 172 | err = _set_memory_wc(vaddr, nrpages); |
| 173 | break; |
venkatesh.pallipadi@intel.com | 3a96ce8 | 2008-03-18 17:00:16 -0700 | [diff] [blame] | 174 | case _PAGE_CACHE_WB: |
venkatesh.pallipadi@intel.com | 1219333 | 2008-03-18 17:00:18 -0700 | [diff] [blame] | 175 | err = _set_memory_wb(vaddr, nrpages); |
Thomas Gleixner | d806e5e | 2008-01-30 13:34:06 +0100 | [diff] [blame] | 176 | break; |
| 177 | } |
Thomas Gleixner | e9332ca | 2008-01-30 13:34:05 +0100 | [diff] [blame] | 178 | |
| 179 | return err; |
| 180 | } |
| 181 | |
| 182 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | * Remap an arbitrary physical address space into the kernel virtual |
| 184 | * address space. Needed when the kernel wants to access high addresses |
| 185 | * directly. |
| 186 | * |
| 187 | * NOTE! We need to allow non-page-aligned mappings too: we will obviously |
| 188 | * have to convert them into an offset in a page-aligned mapping, but the |
| 189 | * caller shouldn't need to know that small detail. |
| 190 | */ |
Christoph Lameter | 2301696 | 2008-04-28 02:12:42 -0700 | [diff] [blame] | 191 | static void __iomem *__ioremap_caller(resource_size_t phys_addr, |
| 192 | unsigned long size, unsigned long prot_val, void *caller) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | { |
Ingo Molnar | 756a6c6 | 2008-03-25 08:31:17 +0100 | [diff] [blame] | 194 | unsigned long pfn, offset, vaddr; |
| 195 | resource_size_t last_addr; |
Pekka Paalanen | 87e547f | 2008-05-12 21:21:03 +0200 | [diff] [blame] | 196 | const resource_size_t unaligned_phys_addr = phys_addr; |
| 197 | const unsigned long unaligned_size = size; |
Thomas Gleixner | 91eebf4 | 2008-01-30 13:34:05 +0100 | [diff] [blame] | 198 | struct vm_struct *area; |
venkatesh.pallipadi@intel.com | d7677d4 | 2008-03-18 17:00:17 -0700 | [diff] [blame] | 199 | unsigned long new_prot_val; |
Thomas Gleixner | d806e5e | 2008-01-30 13:34:06 +0100 | [diff] [blame] | 200 | pgprot_t prot; |
Venki Pallipadi | dee7cbb | 2008-03-24 14:39:55 -0700 | [diff] [blame] | 201 | int retval; |
Pekka Paalanen | d61fc44 | 2008-05-12 21:20:57 +0200 | [diff] [blame] | 202 | void __iomem *ret_addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | |
| 204 | /* Don't allow wraparound or zero size */ |
| 205 | last_addr = phys_addr + size - 1; |
| 206 | if (!size || last_addr < phys_addr) |
| 207 | return NULL; |
| 208 | |
Thomas Gleixner | e3100c8 | 2008-02-27 20:57:40 +0100 | [diff] [blame] | 209 | if (!phys_addr_valid(phys_addr)) { |
venkatesh.pallipadi@intel.com | 6997ab4 | 2008-03-18 17:00:25 -0700 | [diff] [blame] | 210 | printk(KERN_WARNING "ioremap: invalid physical address %llx\n", |
Randy Dunlap | 4c8337a | 2008-04-10 15:09:50 -0700 | [diff] [blame] | 211 | (unsigned long long)phys_addr); |
Thomas Gleixner | e3100c8 | 2008-02-27 20:57:40 +0100 | [diff] [blame] | 212 | WARN_ON_ONCE(1); |
| 213 | return NULL; |
| 214 | } |
| 215 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | /* |
| 217 | * Don't remap the low PCI/ISA area, it's always mapped.. |
| 218 | */ |
Andreas Herrmann | bcc643d | 2008-06-20 21:58:46 +0200 | [diff] [blame] | 219 | if (is_ISA_range(phys_addr, last_addr)) |
Thomas Gleixner | 4b40fce | 2008-01-30 13:34:05 +0100 | [diff] [blame] | 220 | return (__force void __iomem *)phys_to_virt(phys_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | |
| 222 | /* |
Suresh Siddha | 379daf6 | 2008-09-25 18:43:34 -0700 | [diff] [blame] | 223 | * Check if the request spans more than any BAR in the iomem resource |
| 224 | * tree. |
| 225 | */ |
| 226 | WARN_ON(iomem_map_sanity_check(phys_addr, size)); |
| 227 | |
| 228 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 229 | * Don't allow anybody to remap normal RAM that we're using.. |
| 230 | */ |
Andres Salomon | cb8ab68 | 2008-04-30 11:30:24 -0400 | [diff] [blame] | 231 | for (pfn = phys_addr >> PAGE_SHIFT; |
| 232 | (pfn << PAGE_SHIFT) < (last_addr & PAGE_MASK); |
| 233 | pfn++) { |
Ingo Molnar | bdd3cee | 2008-02-28 14:10:49 +0100 | [diff] [blame] | 234 | |
Ingo Molnar | ba748d2 | 2008-03-03 09:37:41 +0100 | [diff] [blame] | 235 | int is_ram = page_is_ram(pfn); |
| 236 | |
| 237 | if (is_ram && pfn_valid(pfn) && !PageReserved(pfn_to_page(pfn))) |
Thomas Gleixner | 266b9f8 | 2008-01-30 13:34:06 +0100 | [diff] [blame] | 238 | return NULL; |
Ingo Molnar | ba748d2 | 2008-03-03 09:37:41 +0100 | [diff] [blame] | 239 | WARN_ON_ONCE(is_ram); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | } |
| 241 | |
venkatesh.pallipadi@intel.com | d7677d4 | 2008-03-18 17:00:17 -0700 | [diff] [blame] | 242 | /* |
| 243 | * Mappings have to be page-aligned |
| 244 | */ |
| 245 | offset = phys_addr & ~PAGE_MASK; |
| 246 | phys_addr &= PAGE_MASK; |
| 247 | size = PAGE_ALIGN(last_addr+1) - phys_addr; |
| 248 | |
Andi Kleen | e213e87 | 2008-08-15 18:12:47 +0200 | [diff] [blame] | 249 | retval = reserve_memtype(phys_addr, (u64)phys_addr + size, |
Venki Pallipadi | dee7cbb | 2008-03-24 14:39:55 -0700 | [diff] [blame] | 250 | prot_val, &new_prot_val); |
| 251 | if (retval) { |
Venki Pallipadi | b450e5e | 2008-03-25 16:51:26 -0700 | [diff] [blame] | 252 | pr_debug("Warning: reserve_memtype returned %d\n", retval); |
Venki Pallipadi | dee7cbb | 2008-03-24 14:39:55 -0700 | [diff] [blame] | 253 | return NULL; |
| 254 | } |
| 255 | |
| 256 | if (prot_val != new_prot_val) { |
venkatesh.pallipadi@intel.com | d7677d4 | 2008-03-18 17:00:17 -0700 | [diff] [blame] | 257 | /* |
| 258 | * Do not fallback to certain memory types with certain |
| 259 | * requested type: |
Suresh Siddha | de33c44 | 2008-04-25 17:07:22 -0700 | [diff] [blame] | 260 | * - request is uc-, return cannot be write-back |
| 261 | * - request is uc-, return cannot be write-combine |
venkatesh.pallipadi@intel.com | b310f381d | 2008-03-18 17:00:24 -0700 | [diff] [blame] | 262 | * - request is write-combine, return cannot be write-back |
venkatesh.pallipadi@intel.com | d7677d4 | 2008-03-18 17:00:17 -0700 | [diff] [blame] | 263 | */ |
Suresh Siddha | de33c44 | 2008-04-25 17:07:22 -0700 | [diff] [blame] | 264 | if ((prot_val == _PAGE_CACHE_UC_MINUS && |
venkatesh.pallipadi@intel.com | b310f381d | 2008-03-18 17:00:24 -0700 | [diff] [blame] | 265 | (new_prot_val == _PAGE_CACHE_WB || |
| 266 | new_prot_val == _PAGE_CACHE_WC)) || |
| 267 | (prot_val == _PAGE_CACHE_WC && |
venkatesh.pallipadi@intel.com | d7677d4 | 2008-03-18 17:00:17 -0700 | [diff] [blame] | 268 | new_prot_val == _PAGE_CACHE_WB)) { |
Venki Pallipadi | b450e5e | 2008-03-25 16:51:26 -0700 | [diff] [blame] | 269 | pr_debug( |
venkatesh.pallipadi@intel.com | 6997ab4 | 2008-03-18 17:00:25 -0700 | [diff] [blame] | 270 | "ioremap error for 0x%llx-0x%llx, requested 0x%lx, got 0x%lx\n", |
Randy Dunlap | 4c8337a | 2008-04-10 15:09:50 -0700 | [diff] [blame] | 271 | (unsigned long long)phys_addr, |
| 272 | (unsigned long long)(phys_addr + size), |
venkatesh.pallipadi@intel.com | 6997ab4 | 2008-03-18 17:00:25 -0700 | [diff] [blame] | 273 | prot_val, new_prot_val); |
venkatesh.pallipadi@intel.com | d7677d4 | 2008-03-18 17:00:17 -0700 | [diff] [blame] | 274 | free_memtype(phys_addr, phys_addr + size); |
| 275 | return NULL; |
| 276 | } |
| 277 | prot_val = new_prot_val; |
| 278 | } |
| 279 | |
venkatesh.pallipadi@intel.com | 3a96ce8 | 2008-03-18 17:00:16 -0700 | [diff] [blame] | 280 | switch (prot_val) { |
| 281 | case _PAGE_CACHE_UC: |
Thomas Gleixner | d806e5e | 2008-01-30 13:34:06 +0100 | [diff] [blame] | 282 | default: |
Jeremy Fitzhardinge | be43d72 | 2008-09-07 15:21:13 -0700 | [diff] [blame] | 283 | prot = PAGE_KERNEL_IO_NOCACHE; |
Thomas Gleixner | d806e5e | 2008-01-30 13:34:06 +0100 | [diff] [blame] | 284 | break; |
Suresh Siddha | de33c44 | 2008-04-25 17:07:22 -0700 | [diff] [blame] | 285 | case _PAGE_CACHE_UC_MINUS: |
Jeremy Fitzhardinge | be43d72 | 2008-09-07 15:21:13 -0700 | [diff] [blame] | 286 | prot = PAGE_KERNEL_IO_UC_MINUS; |
Suresh Siddha | de33c44 | 2008-04-25 17:07:22 -0700 | [diff] [blame] | 287 | break; |
venkatesh.pallipadi@intel.com | b310f381d | 2008-03-18 17:00:24 -0700 | [diff] [blame] | 288 | case _PAGE_CACHE_WC: |
Jeremy Fitzhardinge | be43d72 | 2008-09-07 15:21:13 -0700 | [diff] [blame] | 289 | prot = PAGE_KERNEL_IO_WC; |
venkatesh.pallipadi@intel.com | b310f381d | 2008-03-18 17:00:24 -0700 | [diff] [blame] | 290 | break; |
venkatesh.pallipadi@intel.com | 3a96ce8 | 2008-03-18 17:00:16 -0700 | [diff] [blame] | 291 | case _PAGE_CACHE_WB: |
Jeremy Fitzhardinge | be43d72 | 2008-09-07 15:21:13 -0700 | [diff] [blame] | 292 | prot = PAGE_KERNEL_IO; |
Thomas Gleixner | d806e5e | 2008-01-30 13:34:06 +0100 | [diff] [blame] | 293 | break; |
| 294 | } |
Haavard Skinnemoen | a148ecf | 2006-09-30 23:29:17 -0700 | [diff] [blame] | 295 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | * Ok, go for it.. |
| 298 | */ |
Christoph Lameter | 2301696 | 2008-04-28 02:12:42 -0700 | [diff] [blame] | 299 | area = get_vm_area_caller(size, VM_IOREMAP, caller); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | if (!area) |
| 301 | return NULL; |
| 302 | area->phys_addr = phys_addr; |
Thomas Gleixner | e66aadb | 2008-02-04 16:48:05 +0100 | [diff] [blame] | 303 | vaddr = (unsigned long) area->addr; |
| 304 | if (ioremap_page_range(vaddr, vaddr + size, phys_addr, prot)) { |
venkatesh.pallipadi@intel.com | d7677d4 | 2008-03-18 17:00:17 -0700 | [diff] [blame] | 305 | free_memtype(phys_addr, phys_addr + size); |
Ingo Molnar | b16bf71 | 2008-02-28 14:02:08 +0100 | [diff] [blame] | 306 | free_vm_area(area); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | return NULL; |
| 308 | } |
Thomas Gleixner | e9332ca | 2008-01-30 13:34:05 +0100 | [diff] [blame] | 309 | |
venkatesh.pallipadi@intel.com | 3a96ce8 | 2008-03-18 17:00:16 -0700 | [diff] [blame] | 310 | if (ioremap_change_attr(vaddr, size, prot_val) < 0) { |
venkatesh.pallipadi@intel.com | d7677d4 | 2008-03-18 17:00:17 -0700 | [diff] [blame] | 311 | free_memtype(phys_addr, phys_addr + size); |
Thomas Gleixner | e66aadb | 2008-02-04 16:48:05 +0100 | [diff] [blame] | 312 | vunmap(area->addr); |
Thomas Gleixner | e9332ca | 2008-01-30 13:34:05 +0100 | [diff] [blame] | 313 | return NULL; |
| 314 | } |
| 315 | |
Pekka Paalanen | d61fc44 | 2008-05-12 21:20:57 +0200 | [diff] [blame] | 316 | ret_addr = (void __iomem *) (vaddr + offset); |
Pekka Paalanen | 87e547f | 2008-05-12 21:21:03 +0200 | [diff] [blame] | 317 | mmiotrace_ioremap(unaligned_phys_addr, unaligned_size, ret_addr); |
Pekka Paalanen | d61fc44 | 2008-05-12 21:20:57 +0200 | [diff] [blame] | 318 | |
| 319 | return ret_addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | |
| 322 | /** |
| 323 | * ioremap_nocache - map bus memory into CPU space |
| 324 | * @offset: bus address of the memory |
| 325 | * @size: size of the resource to map |
| 326 | * |
| 327 | * ioremap_nocache performs a platform specific sequence of operations to |
| 328 | * make bus memory CPU accessible via the readb/readw/readl/writeb/ |
| 329 | * writew/writel functions and the other mmio helpers. The returned |
| 330 | * address is not guaranteed to be usable directly as a virtual |
Thomas Gleixner | 91eebf4 | 2008-01-30 13:34:05 +0100 | [diff] [blame] | 331 | * address. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 332 | * |
| 333 | * This version of ioremap ensures that the memory is marked uncachable |
| 334 | * on the CPU as well as honouring existing caching rules from things like |
Thomas Gleixner | 91eebf4 | 2008-01-30 13:34:05 +0100 | [diff] [blame] | 335 | * the PCI bus. Note that there are other caches and buffers on many |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 336 | * busses. In particular driver authors should read up on PCI writes |
| 337 | * |
| 338 | * It's useful if some control registers are in such an area and |
| 339 | * write combining or read caching is not desirable: |
Thomas Gleixner | 91eebf4 | 2008-01-30 13:34:05 +0100 | [diff] [blame] | 340 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 341 | * Must be freed with iounmap. |
| 342 | */ |
Linus Torvalds | b9e76a0 | 2008-03-24 11:22:39 -0700 | [diff] [blame] | 343 | void __iomem *ioremap_nocache(resource_size_t phys_addr, unsigned long size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | { |
Suresh Siddha | de33c44 | 2008-04-25 17:07:22 -0700 | [diff] [blame] | 345 | /* |
| 346 | * Ideally, this should be: |
Andreas Herrmann | 499f8f8 | 2008-06-10 16:06:21 +0200 | [diff] [blame] | 347 | * pat_enabled ? _PAGE_CACHE_UC : _PAGE_CACHE_UC_MINUS; |
Suresh Siddha | de33c44 | 2008-04-25 17:07:22 -0700 | [diff] [blame] | 348 | * |
| 349 | * Till we fix all X drivers to use ioremap_wc(), we will use |
| 350 | * UC MINUS. |
| 351 | */ |
| 352 | unsigned long val = _PAGE_CACHE_UC_MINUS; |
| 353 | |
| 354 | return __ioremap_caller(phys_addr, size, val, |
Christoph Lameter | 2301696 | 2008-04-28 02:12:42 -0700 | [diff] [blame] | 355 | __builtin_return_address(0)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | } |
Alexey Dobriyan | 129f694 | 2005-06-23 00:08:33 -0700 | [diff] [blame] | 357 | EXPORT_SYMBOL(ioremap_nocache); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | |
venkatesh.pallipadi@intel.com | b310f381d | 2008-03-18 17:00:24 -0700 | [diff] [blame] | 359 | /** |
| 360 | * ioremap_wc - map memory into CPU space write combined |
| 361 | * @offset: bus address of the memory |
| 362 | * @size: size of the resource to map |
| 363 | * |
| 364 | * This version of ioremap ensures that the memory is marked write combining. |
| 365 | * Write combining allows faster writes to some hardware devices. |
| 366 | * |
| 367 | * Must be freed with iounmap. |
| 368 | */ |
| 369 | void __iomem *ioremap_wc(unsigned long phys_addr, unsigned long size) |
| 370 | { |
Andreas Herrmann | 499f8f8 | 2008-06-10 16:06:21 +0200 | [diff] [blame] | 371 | if (pat_enabled) |
Christoph Lameter | 2301696 | 2008-04-28 02:12:42 -0700 | [diff] [blame] | 372 | return __ioremap_caller(phys_addr, size, _PAGE_CACHE_WC, |
| 373 | __builtin_return_address(0)); |
venkatesh.pallipadi@intel.com | b310f381d | 2008-03-18 17:00:24 -0700 | [diff] [blame] | 374 | else |
| 375 | return ioremap_nocache(phys_addr, size); |
| 376 | } |
| 377 | EXPORT_SYMBOL(ioremap_wc); |
| 378 | |
Linus Torvalds | b9e76a0 | 2008-03-24 11:22:39 -0700 | [diff] [blame] | 379 | void __iomem *ioremap_cache(resource_size_t phys_addr, unsigned long size) |
Thomas Gleixner | 5f86815 | 2008-01-30 13:34:06 +0100 | [diff] [blame] | 380 | { |
Christoph Lameter | 2301696 | 2008-04-28 02:12:42 -0700 | [diff] [blame] | 381 | return __ioremap_caller(phys_addr, size, _PAGE_CACHE_WB, |
| 382 | __builtin_return_address(0)); |
Thomas Gleixner | 5f86815 | 2008-01-30 13:34:06 +0100 | [diff] [blame] | 383 | } |
| 384 | EXPORT_SYMBOL(ioremap_cache); |
| 385 | |
Venkatesh Pallipadi | a361ee5 | 2008-07-10 10:09:59 +0200 | [diff] [blame] | 386 | static void __iomem *ioremap_default(resource_size_t phys_addr, |
| 387 | unsigned long size) |
| 388 | { |
| 389 | unsigned long flags; |
Harvey Harrison | 1d6cf1f | 2008-10-28 22:46:04 -0700 | [diff] [blame] | 390 | void __iomem *ret; |
Venkatesh Pallipadi | a361ee5 | 2008-07-10 10:09:59 +0200 | [diff] [blame] | 391 | int err; |
| 392 | |
| 393 | /* |
| 394 | * - WB for WB-able memory and no other conflicting mappings |
| 395 | * - UC_MINUS for non-WB-able memory with no other conflicting mappings |
| 396 | * - Inherit from confliting mappings otherwise |
| 397 | */ |
| 398 | err = reserve_memtype(phys_addr, phys_addr + size, -1, &flags); |
| 399 | if (err < 0) |
| 400 | return NULL; |
| 401 | |
Harvey Harrison | 1d6cf1f | 2008-10-28 22:46:04 -0700 | [diff] [blame] | 402 | ret = __ioremap_caller(phys_addr, size, flags, |
| 403 | __builtin_return_address(0)); |
Venkatesh Pallipadi | a361ee5 | 2008-07-10 10:09:59 +0200 | [diff] [blame] | 404 | |
| 405 | free_memtype(phys_addr, phys_addr + size); |
Harvey Harrison | 1d6cf1f | 2008-10-28 22:46:04 -0700 | [diff] [blame] | 406 | return ret; |
Venkatesh Pallipadi | a361ee5 | 2008-07-10 10:09:59 +0200 | [diff] [blame] | 407 | } |
| 408 | |
Rik van Riel | 28b2ee2 | 2008-07-23 21:27:05 -0700 | [diff] [blame] | 409 | void __iomem *ioremap_prot(resource_size_t phys_addr, unsigned long size, |
| 410 | unsigned long prot_val) |
| 411 | { |
| 412 | return __ioremap_caller(phys_addr, size, (prot_val & _PAGE_CACHE_MASK), |
| 413 | __builtin_return_address(0)); |
| 414 | } |
| 415 | EXPORT_SYMBOL(ioremap_prot); |
| 416 | |
Andi Kleen | bf5421c | 2005-12-12 22:17:09 -0800 | [diff] [blame] | 417 | /** |
| 418 | * iounmap - Free a IO remapping |
| 419 | * @addr: virtual address from ioremap_* |
| 420 | * |
| 421 | * Caller must ensure there is only one unmapping for the same pointer. |
| 422 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | void iounmap(volatile void __iomem *addr) |
| 424 | { |
Andi Kleen | bf5421c | 2005-12-12 22:17:09 -0800 | [diff] [blame] | 425 | struct vm_struct *p, *o; |
Andrew Morton | c23a4e96 | 2005-07-07 17:56:02 -0700 | [diff] [blame] | 426 | |
| 427 | if ((void __force *)addr <= high_memory) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 428 | return; |
| 429 | |
| 430 | /* |
| 431 | * __ioremap special-cases the PCI/ISA range by not instantiating a |
| 432 | * vm_area and by simply returning an address into the kernel mapping |
| 433 | * of ISA space. So handle that here. |
| 434 | */ |
Thomas Gleixner | 6e92a5a | 2008-05-12 15:43:35 +0200 | [diff] [blame] | 435 | if ((void __force *)addr >= phys_to_virt(ISA_START_ADDRESS) && |
| 436 | (void __force *)addr < phys_to_virt(ISA_END_ADDRESS)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | return; |
| 438 | |
Thomas Gleixner | 91eebf4 | 2008-01-30 13:34:05 +0100 | [diff] [blame] | 439 | addr = (volatile void __iomem *) |
| 440 | (PAGE_MASK & (unsigned long __force)addr); |
Andi Kleen | bf5421c | 2005-12-12 22:17:09 -0800 | [diff] [blame] | 441 | |
Pekka Paalanen | d61fc44 | 2008-05-12 21:20:57 +0200 | [diff] [blame] | 442 | mmiotrace_iounmap(addr); |
| 443 | |
Andi Kleen | bf5421c | 2005-12-12 22:17:09 -0800 | [diff] [blame] | 444 | /* Use the vm area unlocked, assuming the caller |
| 445 | ensures there isn't another iounmap for the same address |
| 446 | in parallel. Reuse of the virtual address is prevented by |
| 447 | leaving it in the global lists until we're done with it. |
| 448 | cpa takes care of the direct mappings. */ |
| 449 | read_lock(&vmlist_lock); |
| 450 | for (p = vmlist; p; p = p->next) { |
Thomas Gleixner | 6e92a5a | 2008-05-12 15:43:35 +0200 | [diff] [blame] | 451 | if (p->addr == (void __force *)addr) |
Andi Kleen | bf5421c | 2005-12-12 22:17:09 -0800 | [diff] [blame] | 452 | break; |
| 453 | } |
| 454 | read_unlock(&vmlist_lock); |
| 455 | |
| 456 | if (!p) { |
Thomas Gleixner | 91eebf4 | 2008-01-30 13:34:05 +0100 | [diff] [blame] | 457 | printk(KERN_ERR "iounmap: bad address %p\n", addr); |
Andrew Morton | c23a4e96 | 2005-07-07 17:56:02 -0700 | [diff] [blame] | 458 | dump_stack(); |
Andi Kleen | bf5421c | 2005-12-12 22:17:09 -0800 | [diff] [blame] | 459 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | } |
| 461 | |
venkatesh.pallipadi@intel.com | d7677d4 | 2008-03-18 17:00:17 -0700 | [diff] [blame] | 462 | free_memtype(p->phys_addr, p->phys_addr + get_vm_area_size(p)); |
| 463 | |
Andi Kleen | bf5421c | 2005-12-12 22:17:09 -0800 | [diff] [blame] | 464 | /* Finally remove it */ |
Thomas Gleixner | 6e92a5a | 2008-05-12 15:43:35 +0200 | [diff] [blame] | 465 | o = remove_vm_area((void __force *)addr); |
Andi Kleen | bf5421c | 2005-12-12 22:17:09 -0800 | [diff] [blame] | 466 | BUG_ON(p != o || o == NULL); |
Thomas Gleixner | 91eebf4 | 2008-01-30 13:34:05 +0100 | [diff] [blame] | 467 | kfree(p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 468 | } |
Alexey Dobriyan | 129f694 | 2005-06-23 00:08:33 -0700 | [diff] [blame] | 469 | EXPORT_SYMBOL(iounmap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 470 | |
venkatesh.pallipadi@intel.com | e045fb2 | 2008-03-18 17:00:15 -0700 | [diff] [blame] | 471 | /* |
| 472 | * Convert a physical pointer to a virtual kernel pointer for /dev/mem |
| 473 | * access |
| 474 | */ |
| 475 | void *xlate_dev_mem_ptr(unsigned long phys) |
| 476 | { |
| 477 | void *addr; |
| 478 | unsigned long start = phys & PAGE_MASK; |
| 479 | |
| 480 | /* If page is RAM, we can use __va. Otherwise ioremap and unmap. */ |
| 481 | if (page_is_ram(start >> PAGE_SHIFT)) |
| 482 | return __va(phys); |
| 483 | |
Ingo Molnar | ae94b80 | 2008-07-12 07:29:02 +0200 | [diff] [blame] | 484 | addr = (void __force *)ioremap_default(start, PAGE_SIZE); |
venkatesh.pallipadi@intel.com | e045fb2 | 2008-03-18 17:00:15 -0700 | [diff] [blame] | 485 | if (addr) |
| 486 | addr = (void *)((unsigned long)addr | (phys & ~PAGE_MASK)); |
| 487 | |
| 488 | return addr; |
| 489 | } |
| 490 | |
| 491 | void unxlate_dev_mem_ptr(unsigned long phys, void *addr) |
| 492 | { |
| 493 | if (page_is_ram(phys >> PAGE_SHIFT)) |
| 494 | return; |
| 495 | |
| 496 | iounmap((void __iomem *)((unsigned long)addr & PAGE_MASK)); |
| 497 | return; |
| 498 | } |
| 499 | |
Jaswinder Singh | 4b6e9f2 | 2008-07-23 17:39:16 +0530 | [diff] [blame] | 500 | static int __initdata early_ioremap_debug; |
Ingo Molnar | d18d6d6 | 2008-01-30 13:33:45 +0100 | [diff] [blame] | 501 | |
| 502 | static int __init early_ioremap_debug_setup(char *str) |
| 503 | { |
| 504 | early_ioremap_debug = 1; |
| 505 | |
Huang, Ying | 793b24a | 2008-01-30 13:33:45 +0100 | [diff] [blame] | 506 | return 0; |
Ingo Molnar | d18d6d6 | 2008-01-30 13:33:45 +0100 | [diff] [blame] | 507 | } |
Huang, Ying | 793b24a | 2008-01-30 13:33:45 +0100 | [diff] [blame] | 508 | early_param("early_ioremap_debug", early_ioremap_debug_setup); |
Ingo Molnar | d18d6d6 | 2008-01-30 13:33:45 +0100 | [diff] [blame] | 509 | |
Huang, Ying | 0947b2f | 2008-01-30 13:33:44 +0100 | [diff] [blame] | 510 | static __initdata int after_paging_init; |
Jeremy Fitzhardinge | a7bf0bd | 2008-05-28 15:02:14 +0100 | [diff] [blame] | 511 | static pte_t bm_pte[PAGE_SIZE/sizeof(pte_t)] __page_aligned_bss; |
Huang, Ying | 0947b2f | 2008-01-30 13:33:44 +0100 | [diff] [blame] | 512 | |
Ian Campbell | 551889a | 2008-02-09 23:24:09 +0100 | [diff] [blame] | 513 | static inline pmd_t * __init early_ioremap_pmd(unsigned long addr) |
Huang, Ying | 0947b2f | 2008-01-30 13:33:44 +0100 | [diff] [blame] | 514 | { |
Jeremy Fitzhardinge | 37cc8d7 | 2008-02-13 16:20:35 +0100 | [diff] [blame] | 515 | /* Don't assume we're using swapper_pg_dir at this point */ |
| 516 | pgd_t *base = __va(read_cr3()); |
| 517 | pgd_t *pgd = &base[pgd_index(addr)]; |
Ian Campbell | 551889a | 2008-02-09 23:24:09 +0100 | [diff] [blame] | 518 | pud_t *pud = pud_offset(pgd, addr); |
| 519 | pmd_t *pmd = pmd_offset(pud, addr); |
| 520 | |
| 521 | return pmd; |
Huang, Ying | 0947b2f | 2008-01-30 13:33:44 +0100 | [diff] [blame] | 522 | } |
| 523 | |
Ian Campbell | 551889a | 2008-02-09 23:24:09 +0100 | [diff] [blame] | 524 | static inline pte_t * __init early_ioremap_pte(unsigned long addr) |
Huang, Ying | 0947b2f | 2008-01-30 13:33:44 +0100 | [diff] [blame] | 525 | { |
Ian Campbell | 551889a | 2008-02-09 23:24:09 +0100 | [diff] [blame] | 526 | return &bm_pte[pte_index(addr)]; |
Huang, Ying | 0947b2f | 2008-01-30 13:33:44 +0100 | [diff] [blame] | 527 | } |
| 528 | |
Huang, Ying | beacfaa | 2008-01-30 13:33:44 +0100 | [diff] [blame] | 529 | void __init early_ioremap_init(void) |
Huang, Ying | 0947b2f | 2008-01-30 13:33:44 +0100 | [diff] [blame] | 530 | { |
Ian Campbell | 551889a | 2008-02-09 23:24:09 +0100 | [diff] [blame] | 531 | pmd_t *pmd; |
Huang, Ying | 0947b2f | 2008-01-30 13:33:44 +0100 | [diff] [blame] | 532 | |
Ingo Molnar | d18d6d6 | 2008-01-30 13:33:45 +0100 | [diff] [blame] | 533 | if (early_ioremap_debug) |
Ingo Molnar | adafdf6 | 2008-01-30 13:34:08 +0100 | [diff] [blame] | 534 | printk(KERN_INFO "early_ioremap_init()\n"); |
Ingo Molnar | d18d6d6 | 2008-01-30 13:33:45 +0100 | [diff] [blame] | 535 | |
Ian Campbell | 551889a | 2008-02-09 23:24:09 +0100 | [diff] [blame] | 536 | pmd = early_ioremap_pmd(fix_to_virt(FIX_BTMAP_BEGIN)); |
Huang, Ying | 0947b2f | 2008-01-30 13:33:44 +0100 | [diff] [blame] | 537 | memset(bm_pte, 0, sizeof(bm_pte)); |
Ian Campbell | b6fbb66 | 2008-02-09 23:24:09 +0100 | [diff] [blame] | 538 | pmd_populate_kernel(&init_mm, pmd, bm_pte); |
Ian Campbell | 551889a | 2008-02-09 23:24:09 +0100 | [diff] [blame] | 539 | |
Ingo Molnar | 0e3a954 | 2008-01-30 13:33:49 +0100 | [diff] [blame] | 540 | /* |
Ian Campbell | 551889a | 2008-02-09 23:24:09 +0100 | [diff] [blame] | 541 | * The boot-ioremap range spans multiple pmds, for which |
Ingo Molnar | 0e3a954 | 2008-01-30 13:33:49 +0100 | [diff] [blame] | 542 | * we are not prepared: |
| 543 | */ |
Ian Campbell | 551889a | 2008-02-09 23:24:09 +0100 | [diff] [blame] | 544 | if (pmd != early_ioremap_pmd(fix_to_virt(FIX_BTMAP_END))) { |
Ingo Molnar | 0e3a954 | 2008-01-30 13:33:49 +0100 | [diff] [blame] | 545 | WARN_ON(1); |
Ian Campbell | 551889a | 2008-02-09 23:24:09 +0100 | [diff] [blame] | 546 | printk(KERN_WARNING "pmd %p != %p\n", |
| 547 | pmd, early_ioremap_pmd(fix_to_virt(FIX_BTMAP_END))); |
Thomas Gleixner | 91eebf4 | 2008-01-30 13:34:05 +0100 | [diff] [blame] | 548 | printk(KERN_WARNING "fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n", |
Ian Campbell | 551889a | 2008-02-09 23:24:09 +0100 | [diff] [blame] | 549 | fix_to_virt(FIX_BTMAP_BEGIN)); |
Thomas Gleixner | 91eebf4 | 2008-01-30 13:34:05 +0100 | [diff] [blame] | 550 | printk(KERN_WARNING "fix_to_virt(FIX_BTMAP_END): %08lx\n", |
Ian Campbell | 551889a | 2008-02-09 23:24:09 +0100 | [diff] [blame] | 551 | fix_to_virt(FIX_BTMAP_END)); |
Ingo Molnar | 0e3a954 | 2008-01-30 13:33:49 +0100 | [diff] [blame] | 552 | |
Thomas Gleixner | 91eebf4 | 2008-01-30 13:34:05 +0100 | [diff] [blame] | 553 | printk(KERN_WARNING "FIX_BTMAP_END: %d\n", FIX_BTMAP_END); |
| 554 | printk(KERN_WARNING "FIX_BTMAP_BEGIN: %d\n", |
| 555 | FIX_BTMAP_BEGIN); |
Ingo Molnar | 0e3a954 | 2008-01-30 13:33:49 +0100 | [diff] [blame] | 556 | } |
Huang, Ying | 0947b2f | 2008-01-30 13:33:44 +0100 | [diff] [blame] | 557 | } |
| 558 | |
Huang, Ying | beacfaa | 2008-01-30 13:33:44 +0100 | [diff] [blame] | 559 | void __init early_ioremap_clear(void) |
Huang, Ying | 0947b2f | 2008-01-30 13:33:44 +0100 | [diff] [blame] | 560 | { |
Ian Campbell | 551889a | 2008-02-09 23:24:09 +0100 | [diff] [blame] | 561 | pmd_t *pmd; |
Huang, Ying | 0947b2f | 2008-01-30 13:33:44 +0100 | [diff] [blame] | 562 | |
Ingo Molnar | d18d6d6 | 2008-01-30 13:33:45 +0100 | [diff] [blame] | 563 | if (early_ioremap_debug) |
Ingo Molnar | adafdf6 | 2008-01-30 13:34:08 +0100 | [diff] [blame] | 564 | printk(KERN_INFO "early_ioremap_clear()\n"); |
Ingo Molnar | d18d6d6 | 2008-01-30 13:33:45 +0100 | [diff] [blame] | 565 | |
Ian Campbell | 551889a | 2008-02-09 23:24:09 +0100 | [diff] [blame] | 566 | pmd = early_ioremap_pmd(fix_to_virt(FIX_BTMAP_BEGIN)); |
| 567 | pmd_clear(pmd); |
Jeremy Fitzhardinge | 6944a9c | 2008-03-17 16:37:01 -0700 | [diff] [blame] | 568 | paravirt_release_pte(__pa(bm_pte) >> PAGE_SHIFT); |
Huang, Ying | 0947b2f | 2008-01-30 13:33:44 +0100 | [diff] [blame] | 569 | __flush_tlb_all(); |
| 570 | } |
| 571 | |
Huang, Ying | beacfaa | 2008-01-30 13:33:44 +0100 | [diff] [blame] | 572 | void __init early_ioremap_reset(void) |
Huang, Ying | 0947b2f | 2008-01-30 13:33:44 +0100 | [diff] [blame] | 573 | { |
| 574 | enum fixed_addresses idx; |
Ian Campbell | 551889a | 2008-02-09 23:24:09 +0100 | [diff] [blame] | 575 | unsigned long addr, phys; |
| 576 | pte_t *pte; |
Huang, Ying | 0947b2f | 2008-01-30 13:33:44 +0100 | [diff] [blame] | 577 | |
| 578 | after_paging_init = 1; |
Huang, Ying | 64a8f85 | 2008-01-30 13:33:44 +0100 | [diff] [blame] | 579 | for (idx = FIX_BTMAP_BEGIN; idx >= FIX_BTMAP_END; idx--) { |
Huang, Ying | 0947b2f | 2008-01-30 13:33:44 +0100 | [diff] [blame] | 580 | addr = fix_to_virt(idx); |
Huang, Ying | beacfaa | 2008-01-30 13:33:44 +0100 | [diff] [blame] | 581 | pte = early_ioremap_pte(addr); |
Ian Campbell | 551889a | 2008-02-09 23:24:09 +0100 | [diff] [blame] | 582 | if (pte_present(*pte)) { |
| 583 | phys = pte_val(*pte) & PAGE_MASK; |
Huang, Ying | 0947b2f | 2008-01-30 13:33:44 +0100 | [diff] [blame] | 584 | set_fixmap(idx, phys); |
| 585 | } |
| 586 | } |
| 587 | } |
| 588 | |
Huang, Ying | beacfaa | 2008-01-30 13:33:44 +0100 | [diff] [blame] | 589 | static void __init __early_set_fixmap(enum fixed_addresses idx, |
Huang, Ying | 0947b2f | 2008-01-30 13:33:44 +0100 | [diff] [blame] | 590 | unsigned long phys, pgprot_t flags) |
| 591 | { |
Ian Campbell | 551889a | 2008-02-09 23:24:09 +0100 | [diff] [blame] | 592 | unsigned long addr = __fix_to_virt(idx); |
| 593 | pte_t *pte; |
Huang, Ying | 0947b2f | 2008-01-30 13:33:44 +0100 | [diff] [blame] | 594 | |
| 595 | if (idx >= __end_of_fixed_addresses) { |
| 596 | BUG(); |
| 597 | return; |
| 598 | } |
Huang, Ying | beacfaa | 2008-01-30 13:33:44 +0100 | [diff] [blame] | 599 | pte = early_ioremap_pte(addr); |
Jeremy Fitzhardinge | 4583ed5 | 2008-06-25 00:19:03 -0400 | [diff] [blame] | 600 | |
Huang, Ying | 0947b2f | 2008-01-30 13:33:44 +0100 | [diff] [blame] | 601 | if (pgprot_val(flags)) |
Ian Campbell | 551889a | 2008-02-09 23:24:09 +0100 | [diff] [blame] | 602 | set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, flags)); |
Huang, Ying | 0947b2f | 2008-01-30 13:33:44 +0100 | [diff] [blame] | 603 | else |
Jeremy Fitzhardinge | 4f9c11d | 2008-06-25 00:19:19 -0400 | [diff] [blame] | 604 | pte_clear(&init_mm, addr, pte); |
Huang, Ying | 0947b2f | 2008-01-30 13:33:44 +0100 | [diff] [blame] | 605 | __flush_tlb_one(addr); |
| 606 | } |
| 607 | |
Huang, Ying | beacfaa | 2008-01-30 13:33:44 +0100 | [diff] [blame] | 608 | static inline void __init early_set_fixmap(enum fixed_addresses idx, |
Jeremy Fitzhardinge | 1494177 | 2008-09-07 15:21:15 -0700 | [diff] [blame] | 609 | unsigned long phys, pgprot_t prot) |
Huang, Ying | 0947b2f | 2008-01-30 13:33:44 +0100 | [diff] [blame] | 610 | { |
| 611 | if (after_paging_init) |
Jeremy Fitzhardinge | 1494177 | 2008-09-07 15:21:15 -0700 | [diff] [blame] | 612 | __set_fixmap(idx, phys, prot); |
Huang, Ying | 0947b2f | 2008-01-30 13:33:44 +0100 | [diff] [blame] | 613 | else |
Jeremy Fitzhardinge | 1494177 | 2008-09-07 15:21:15 -0700 | [diff] [blame] | 614 | __early_set_fixmap(idx, phys, prot); |
Huang, Ying | 0947b2f | 2008-01-30 13:33:44 +0100 | [diff] [blame] | 615 | } |
| 616 | |
Huang, Ying | beacfaa | 2008-01-30 13:33:44 +0100 | [diff] [blame] | 617 | static inline void __init early_clear_fixmap(enum fixed_addresses idx) |
Huang, Ying | 0947b2f | 2008-01-30 13:33:44 +0100 | [diff] [blame] | 618 | { |
| 619 | if (after_paging_init) |
| 620 | clear_fixmap(idx); |
| 621 | else |
Huang, Ying | beacfaa | 2008-01-30 13:33:44 +0100 | [diff] [blame] | 622 | __early_set_fixmap(idx, 0, __pgprot(0)); |
Huang, Ying | 0947b2f | 2008-01-30 13:33:44 +0100 | [diff] [blame] | 623 | } |
| 624 | |
Harvey Harrison | 1d6cf1f | 2008-10-28 22:46:04 -0700 | [diff] [blame] | 625 | static void __iomem *prev_map[FIX_BTMAPS_SLOTS] __initdata; |
Yinghai Lu | c1a2f4b | 2008-09-14 02:33:12 -0700 | [diff] [blame] | 626 | static unsigned long prev_size[FIX_BTMAPS_SLOTS] __initdata; |
Ingo Molnar | d690b2a | 2008-01-30 13:33:47 +0100 | [diff] [blame] | 627 | static int __init check_early_ioremap_leak(void) |
| 628 | { |
Yinghai Lu | c1a2f4b | 2008-09-14 02:33:12 -0700 | [diff] [blame] | 629 | int count = 0; |
| 630 | int i; |
| 631 | |
| 632 | for (i = 0; i < FIX_BTMAPS_SLOTS; i++) |
| 633 | if (prev_map[i]) |
| 634 | count++; |
| 635 | |
| 636 | if (!count) |
Ingo Molnar | d690b2a | 2008-01-30 13:33:47 +0100 | [diff] [blame] | 637 | return 0; |
Arjan van de Ven | 0c072bb | 2008-07-08 09:50:22 -0700 | [diff] [blame] | 638 | WARN(1, KERN_WARNING |
Thomas Gleixner | 91eebf4 | 2008-01-30 13:34:05 +0100 | [diff] [blame] | 639 | "Debug warning: early ioremap leak of %d areas detected.\n", |
Yinghai Lu | c1a2f4b | 2008-09-14 02:33:12 -0700 | [diff] [blame] | 640 | count); |
Ingo Molnar | d690b2a | 2008-01-30 13:33:47 +0100 | [diff] [blame] | 641 | printk(KERN_WARNING |
Arjan van de Ven | 0c072bb | 2008-07-08 09:50:22 -0700 | [diff] [blame] | 642 | "please boot with early_ioremap_debug and report the dmesg.\n"); |
Ingo Molnar | d690b2a | 2008-01-30 13:33:47 +0100 | [diff] [blame] | 643 | |
| 644 | return 1; |
| 645 | } |
| 646 | late_initcall(check_early_ioremap_leak); |
| 647 | |
Harvey Harrison | 1d6cf1f | 2008-10-28 22:46:04 -0700 | [diff] [blame] | 648 | static void __init __iomem *__early_ioremap(unsigned long phys_addr, unsigned long size, pgprot_t prot) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 649 | { |
| 650 | unsigned long offset, last_addr; |
Yinghai Lu | c1a2f4b | 2008-09-14 02:33:12 -0700 | [diff] [blame] | 651 | unsigned int nrpages; |
Ingo Molnar | 1b42f51 | 2008-01-30 13:33:45 +0100 | [diff] [blame] | 652 | enum fixed_addresses idx0, idx; |
Yinghai Lu | c1a2f4b | 2008-09-14 02:33:12 -0700 | [diff] [blame] | 653 | int i, slot; |
Ingo Molnar | 1b42f51 | 2008-01-30 13:33:45 +0100 | [diff] [blame] | 654 | |
| 655 | WARN_ON(system_state != SYSTEM_BOOTING); |
| 656 | |
Yinghai Lu | c1a2f4b | 2008-09-14 02:33:12 -0700 | [diff] [blame] | 657 | slot = -1; |
| 658 | for (i = 0; i < FIX_BTMAPS_SLOTS; i++) { |
| 659 | if (!prev_map[i]) { |
| 660 | slot = i; |
| 661 | break; |
| 662 | } |
| 663 | } |
| 664 | |
| 665 | if (slot < 0) { |
| 666 | printk(KERN_INFO "early_iomap(%08lx, %08lx) not found slot\n", |
| 667 | phys_addr, size); |
| 668 | WARN_ON(1); |
| 669 | return NULL; |
| 670 | } |
| 671 | |
Ingo Molnar | d18d6d6 | 2008-01-30 13:33:45 +0100 | [diff] [blame] | 672 | if (early_ioremap_debug) { |
Ingo Molnar | adafdf6 | 2008-01-30 13:34:08 +0100 | [diff] [blame] | 673 | printk(KERN_INFO "early_ioremap(%08lx, %08lx) [%d] => ", |
Yinghai Lu | c1a2f4b | 2008-09-14 02:33:12 -0700 | [diff] [blame] | 674 | phys_addr, size, slot); |
Ingo Molnar | d18d6d6 | 2008-01-30 13:33:45 +0100 | [diff] [blame] | 675 | dump_stack(); |
| 676 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 677 | |
| 678 | /* Don't allow wraparound or zero size */ |
| 679 | last_addr = phys_addr + size - 1; |
Ingo Molnar | bd796ed | 2008-01-30 13:33:45 +0100 | [diff] [blame] | 680 | if (!size || last_addr < phys_addr) { |
| 681 | WARN_ON(1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 682 | return NULL; |
Ingo Molnar | bd796ed | 2008-01-30 13:33:45 +0100 | [diff] [blame] | 683 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 684 | |
Yinghai Lu | c1a2f4b | 2008-09-14 02:33:12 -0700 | [diff] [blame] | 685 | prev_size[slot] = size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 686 | /* |
| 687 | * Mappings have to be page-aligned |
| 688 | */ |
| 689 | offset = phys_addr & ~PAGE_MASK; |
| 690 | phys_addr &= PAGE_MASK; |
Alan Cox | c613ec1 | 2008-10-10 10:46:45 +0100 | [diff] [blame] | 691 | size = PAGE_ALIGN(last_addr + 1) - phys_addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 692 | |
| 693 | /* |
| 694 | * Mappings have to fit in the FIX_BTMAP area. |
| 695 | */ |
| 696 | nrpages = size >> PAGE_SHIFT; |
Ingo Molnar | bd796ed | 2008-01-30 13:33:45 +0100 | [diff] [blame] | 697 | if (nrpages > NR_FIX_BTMAPS) { |
| 698 | WARN_ON(1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 699 | return NULL; |
Ingo Molnar | bd796ed | 2008-01-30 13:33:45 +0100 | [diff] [blame] | 700 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 701 | |
| 702 | /* |
| 703 | * Ok, go for it.. |
| 704 | */ |
Yinghai Lu | c1a2f4b | 2008-09-14 02:33:12 -0700 | [diff] [blame] | 705 | idx0 = FIX_BTMAP_BEGIN - NR_FIX_BTMAPS*slot; |
Ingo Molnar | 1b42f51 | 2008-01-30 13:33:45 +0100 | [diff] [blame] | 706 | idx = idx0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 707 | while (nrpages > 0) { |
Jeremy Fitzhardinge | 1494177 | 2008-09-07 15:21:15 -0700 | [diff] [blame] | 708 | early_set_fixmap(idx, phys_addr, prot); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 709 | phys_addr += PAGE_SIZE; |
| 710 | --idx; |
| 711 | --nrpages; |
| 712 | } |
Ingo Molnar | d18d6d6 | 2008-01-30 13:33:45 +0100 | [diff] [blame] | 713 | if (early_ioremap_debug) |
| 714 | printk(KERN_CONT "%08lx + %08lx\n", offset, fix_to_virt(idx0)); |
Ingo Molnar | 1b42f51 | 2008-01-30 13:33:45 +0100 | [diff] [blame] | 715 | |
Harvey Harrison | 1d6cf1f | 2008-10-28 22:46:04 -0700 | [diff] [blame] | 716 | prev_map[slot] = (void __iomem *)(offset + fix_to_virt(idx0)); |
Yinghai Lu | c1a2f4b | 2008-09-14 02:33:12 -0700 | [diff] [blame] | 717 | return prev_map[slot]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 718 | } |
| 719 | |
Jeremy Fitzhardinge | 1494177 | 2008-09-07 15:21:15 -0700 | [diff] [blame] | 720 | /* Remap an IO device */ |
Harvey Harrison | 1d6cf1f | 2008-10-28 22:46:04 -0700 | [diff] [blame] | 721 | void __init __iomem *early_ioremap(unsigned long phys_addr, unsigned long size) |
Jeremy Fitzhardinge | 1494177 | 2008-09-07 15:21:15 -0700 | [diff] [blame] | 722 | { |
| 723 | return __early_ioremap(phys_addr, size, PAGE_KERNEL_IO); |
| 724 | } |
| 725 | |
| 726 | /* Remap memory */ |
Harvey Harrison | 1d6cf1f | 2008-10-28 22:46:04 -0700 | [diff] [blame] | 727 | void __init __iomem *early_memremap(unsigned long phys_addr, unsigned long size) |
Jeremy Fitzhardinge | 1494177 | 2008-09-07 15:21:15 -0700 | [diff] [blame] | 728 | { |
| 729 | return __early_ioremap(phys_addr, size, PAGE_KERNEL); |
| 730 | } |
| 731 | |
Harvey Harrison | 1d6cf1f | 2008-10-28 22:46:04 -0700 | [diff] [blame] | 732 | void __init early_iounmap(void __iomem *addr, unsigned long size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 733 | { |
| 734 | unsigned long virt_addr; |
| 735 | unsigned long offset; |
| 736 | unsigned int nrpages; |
| 737 | enum fixed_addresses idx; |
Yinghai Lu | c1a2f4b | 2008-09-14 02:33:12 -0700 | [diff] [blame] | 738 | int i, slot; |
Ingo Molnar | 1b42f51 | 2008-01-30 13:33:45 +0100 | [diff] [blame] | 739 | |
Yinghai Lu | c1a2f4b | 2008-09-14 02:33:12 -0700 | [diff] [blame] | 740 | slot = -1; |
| 741 | for (i = 0; i < FIX_BTMAPS_SLOTS; i++) { |
| 742 | if (prev_map[i] == addr) { |
| 743 | slot = i; |
| 744 | break; |
| 745 | } |
| 746 | } |
| 747 | |
| 748 | if (slot < 0) { |
| 749 | printk(KERN_INFO "early_iounmap(%p, %08lx) not found slot\n", |
| 750 | addr, size); |
| 751 | WARN_ON(1); |
Ingo Molnar | 226e9a9 | 2008-05-27 09:56:49 +0200 | [diff] [blame] | 752 | return; |
Yinghai Lu | c1a2f4b | 2008-09-14 02:33:12 -0700 | [diff] [blame] | 753 | } |
| 754 | |
| 755 | if (prev_size[slot] != size) { |
| 756 | printk(KERN_INFO "early_iounmap(%p, %08lx) [%d] size not consistent %08lx\n", |
| 757 | addr, size, slot, prev_size[slot]); |
| 758 | WARN_ON(1); |
| 759 | return; |
| 760 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 761 | |
Ingo Molnar | d18d6d6 | 2008-01-30 13:33:45 +0100 | [diff] [blame] | 762 | if (early_ioremap_debug) { |
Ingo Molnar | adafdf6 | 2008-01-30 13:34:08 +0100 | [diff] [blame] | 763 | printk(KERN_INFO "early_iounmap(%p, %08lx) [%d]\n", addr, |
Yinghai Lu | c1a2f4b | 2008-09-14 02:33:12 -0700 | [diff] [blame] | 764 | size, slot); |
Ingo Molnar | d18d6d6 | 2008-01-30 13:33:45 +0100 | [diff] [blame] | 765 | dump_stack(); |
| 766 | } |
| 767 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 768 | virt_addr = (unsigned long)addr; |
Ingo Molnar | bd796ed | 2008-01-30 13:33:45 +0100 | [diff] [blame] | 769 | if (virt_addr < fix_to_virt(FIX_BTMAP_BEGIN)) { |
| 770 | WARN_ON(1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 771 | return; |
Ingo Molnar | bd796ed | 2008-01-30 13:33:45 +0100 | [diff] [blame] | 772 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 773 | offset = virt_addr & ~PAGE_MASK; |
| 774 | nrpages = PAGE_ALIGN(offset + size - 1) >> PAGE_SHIFT; |
| 775 | |
Yinghai Lu | c1a2f4b | 2008-09-14 02:33:12 -0700 | [diff] [blame] | 776 | idx = FIX_BTMAP_BEGIN - NR_FIX_BTMAPS*slot; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 777 | while (nrpages > 0) { |
Huang, Ying | beacfaa | 2008-01-30 13:33:44 +0100 | [diff] [blame] | 778 | early_clear_fixmap(idx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 779 | --idx; |
| 780 | --nrpages; |
| 781 | } |
Harvey Harrison | 1d6cf1f | 2008-10-28 22:46:04 -0700 | [diff] [blame] | 782 | prev_map[slot] = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 783 | } |
Ingo Molnar | 1b42f51 | 2008-01-30 13:33:45 +0100 | [diff] [blame] | 784 | |
| 785 | void __this_fixmap_does_not_exist(void) |
| 786 | { |
| 787 | WARN_ON(1); |
| 788 | } |