pgtable_64.c 7.6 KB

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  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
  10. * Amiga/APUS changes by Jesper Skov (jskov@cygnus.co.uk).
  11. *
  12. * Derived from "arch/i386/mm/init.c"
  13. * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
  14. *
  15. * Dave Engebretsen <engebret@us.ibm.com>
  16. * Rework for PPC64 port.
  17. *
  18. * This program is free software; you can redistribute it and/or
  19. * modify it under the terms of the GNU General Public License
  20. * as published by the Free Software Foundation; either version
  21. * 2 of the License, or (at your option) any later version.
  22. *
  23. */
  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>
  36. #include <linux/delay.h>
  37. #include <linux/bootmem.h>
  38. #include <linux/highmem.h>
  39. #include <linux/idr.h>
  40. #include <linux/nodemask.h>
  41. #include <linux/module.h>
  42. #include <asm/pgalloc.h>
  43. #include <asm/page.h>
  44. #include <asm/prom.h>
  45. #include <asm/lmb.h>
  46. #include <asm/rtas.h>
  47. #include <asm/io.h>
  48. #include <asm/mmu_context.h>
  49. #include <asm/pgtable.h>
  50. #include <asm/mmu.h>
  51. #include <asm/uaccess.h>
  52. #include <asm/smp.h>
  53. #include <asm/machdep.h>
  54. #include <asm/tlb.h>
  55. #include <asm/eeh.h>
  56. #include <asm/processor.h>
  57. #include <asm/mmzone.h>
  58. #include <asm/cputable.h>
  59. #include <asm/sections.h>
  60. #include <asm/system.h>
  61. #include <asm/iommu.h>
  62. #include <asm/abs_addr.h>
  63. #include <asm/vdso.h>
  64. #include <asm/firmware.h>
  65. #include "mmu_decl.h"
  66. unsigned long ioremap_bot = IMALLOC_BASE;
  67. static unsigned long phbs_io_bot = PHBS_IO_BASE;
  68. /*
  69. * map_io_page currently only called by __ioremap
  70. * map_io_page adds an entry to the ioremap page table
  71. * and adds an entry to the HPT, possibly bolting it
  72. */
  73. static int map_io_page(unsigned long ea, unsigned long pa, int flags)
  74. {
  75. pgd_t *pgdp;
  76. pud_t *pudp;
  77. pmd_t *pmdp;
  78. pte_t *ptep;
  79. if (mem_init_done) {
  80. pgdp = pgd_offset_k(ea);
  81. pudp = pud_alloc(&init_mm, pgdp, ea);
  82. if (!pudp)
  83. return -ENOMEM;
  84. pmdp = pmd_alloc(&init_mm, pudp, ea);
  85. if (!pmdp)
  86. return -ENOMEM;
  87. ptep = pte_alloc_kernel(pmdp, ea);
  88. if (!ptep)
  89. return -ENOMEM;
  90. set_pte_at(&init_mm, ea, ptep, pfn_pte(pa >> PAGE_SHIFT,
  91. __pgprot(flags)));
  92. } else {
  93. /*
  94. * If the mm subsystem is not fully up, we cannot create a
  95. * linux page table entry for this mapping. Simply bolt an
  96. * entry in the hardware page table.
  97. *
  98. */
  99. if (htab_bolt_mapping(ea, ea + PAGE_SIZE, pa, flags,
  100. mmu_virtual_psize)) {
  101. printk(KERN_ERR "Failed to do bolted mapping IO "
  102. "memory at %016lx !\n", pa);
  103. return -ENOMEM;
  104. }
  105. }
  106. return 0;
  107. }
  108. static void __iomem * __ioremap_com(unsigned long addr, unsigned long pa,
  109. unsigned long ea, unsigned long size,
  110. unsigned long flags)
  111. {
  112. unsigned long i;
  113. if ((flags & _PAGE_PRESENT) == 0)
  114. flags |= pgprot_val(PAGE_KERNEL);
  115. for (i = 0; i < size; i += PAGE_SIZE)
  116. if (map_io_page(ea+i, pa+i, flags))
  117. return NULL;
  118. return (void __iomem *) (ea + (addr & ~PAGE_MASK));
  119. }
  120. void __iomem *
  121. ioremap(unsigned long addr, unsigned long size)
  122. {
  123. return __ioremap(addr, size, _PAGE_NO_CACHE | _PAGE_GUARDED);
  124. }
  125. void __iomem * __ioremap(unsigned long addr, unsigned long size,
  126. unsigned long flags)
  127. {
  128. unsigned long pa, ea;
  129. void __iomem *ret;
  130. if (firmware_has_feature(FW_FEATURE_ISERIES))
  131. return (void __iomem *)addr;
  132. /*
  133. * Choose an address to map it to.
  134. * Once the imalloc system is running, we use it.
  135. * Before that, we map using addresses going
  136. * up from ioremap_bot. imalloc will use
  137. * the addresses from ioremap_bot through
  138. * IMALLOC_END
  139. *
  140. */
  141. pa = addr & PAGE_MASK;
  142. size = PAGE_ALIGN(addr + size) - pa;
  143. if ((size == 0) || (pa == 0))
  144. return NULL;
  145. if (mem_init_done) {
  146. struct vm_struct *area;
  147. area = im_get_free_area(size);
  148. if (area == NULL)
  149. return NULL;
  150. ea = (unsigned long)(area->addr);
  151. ret = __ioremap_com(addr, pa, ea, size, flags);
  152. if (!ret)
  153. im_free(area->addr);
  154. } else {
  155. ea = ioremap_bot;
  156. ret = __ioremap_com(addr, pa, ea, size, flags);
  157. if (ret)
  158. ioremap_bot += size;
  159. }
  160. return ret;
  161. }
  162. #define IS_PAGE_ALIGNED(_val) ((_val) == ((_val) & PAGE_MASK))
  163. int __ioremap_explicit(unsigned long pa, unsigned long ea,
  164. unsigned long size, unsigned long flags)
  165. {
  166. struct vm_struct *area;
  167. void __iomem *ret;
  168. /* For now, require page-aligned values for pa, ea, and size */
  169. if (!IS_PAGE_ALIGNED(pa) || !IS_PAGE_ALIGNED(ea) ||
  170. !IS_PAGE_ALIGNED(size)) {
  171. printk(KERN_ERR "unaligned value in %s\n", __FUNCTION__);
  172. return 1;
  173. }
  174. if (!mem_init_done) {
  175. /* Two things to consider in this case:
  176. * 1) No records will be kept (imalloc, etc) that the region
  177. * has been remapped
  178. * 2) It won't be easy to iounmap() the region later (because
  179. * of 1)
  180. */
  181. ;
  182. } else {
  183. area = im_get_area(ea, size,
  184. IM_REGION_UNUSED|IM_REGION_SUBSET|IM_REGION_EXISTS);
  185. if (area == NULL) {
  186. /* Expected when PHB-dlpar is in play */
  187. return 1;
  188. }
  189. if (ea != (unsigned long) area->addr) {
  190. printk(KERN_ERR "unexpected addr return from "
  191. "im_get_area\n");
  192. return 1;
  193. }
  194. }
  195. ret = __ioremap_com(pa, pa, ea, size, flags);
  196. if (ret == NULL) {
  197. printk(KERN_ERR "ioremap_explicit() allocation failure !\n");
  198. return 1;
  199. }
  200. if (ret != (void *) ea) {
  201. printk(KERN_ERR "__ioremap_com() returned unexpected addr\n");
  202. return 1;
  203. }
  204. return 0;
  205. }
  206. /*
  207. * Unmap an IO region and remove it from imalloc'd list.
  208. * Access to IO memory should be serialized by driver.
  209. * This code is modeled after vmalloc code - unmap_vm_area()
  210. *
  211. * XXX what about calls before mem_init_done (ie python_countermeasures())
  212. */
  213. void iounmap(volatile void __iomem *token)
  214. {
  215. void *addr;
  216. if (firmware_has_feature(FW_FEATURE_ISERIES))
  217. return;
  218. if (!mem_init_done)
  219. return;
  220. addr = (void *) ((unsigned long __force) token & PAGE_MASK);
  221. im_free(addr);
  222. }
  223. static int iounmap_subset_regions(unsigned long addr, unsigned long size)
  224. {
  225. struct vm_struct *area;
  226. /* Check whether subsets of this region exist */
  227. area = im_get_area(addr, size, IM_REGION_SUPERSET);
  228. if (area == NULL)
  229. return 1;
  230. while (area) {
  231. iounmap((void __iomem *) area->addr);
  232. area = im_get_area(addr, size,
  233. IM_REGION_SUPERSET);
  234. }
  235. return 0;
  236. }
  237. int iounmap_explicit(volatile void __iomem *start, unsigned long size)
  238. {
  239. struct vm_struct *area;
  240. unsigned long addr;
  241. int rc;
  242. addr = (unsigned long __force) start & PAGE_MASK;
  243. /* Verify that the region either exists or is a subset of an existing
  244. * region. In the latter case, split the parent region to create
  245. * the exact region
  246. */
  247. area = im_get_area(addr, size,
  248. IM_REGION_EXISTS | IM_REGION_SUBSET);
  249. if (area == NULL) {
  250. /* Determine whether subset regions exist. If so, unmap */
  251. rc = iounmap_subset_regions(addr, size);
  252. if (rc) {
  253. printk(KERN_ERR
  254. "%s() cannot unmap nonexistent range 0x%lx\n",
  255. __FUNCTION__, addr);
  256. return 1;
  257. }
  258. } else {
  259. iounmap((void __iomem *) area->addr);
  260. }
  261. /*
  262. * FIXME! This can't be right:
  263. iounmap(area->addr);
  264. * Maybe it should be "iounmap(area);"
  265. */
  266. return 0;
  267. }
  268. EXPORT_SYMBOL(ioremap);
  269. EXPORT_SYMBOL(__ioremap);
  270. EXPORT_SYMBOL(iounmap);
  271. void __iomem * reserve_phb_iospace(unsigned long size)
  272. {
  273. void __iomem *virt_addr;
  274. if (phbs_io_bot >= IMALLOC_BASE)
  275. panic("reserve_phb_iospace(): phb io space overflow\n");
  276. virt_addr = (void __iomem *) phbs_io_bot;
  277. phbs_io_bot += size;
  278. return virt_addr;
  279. }