/arch/s390/mm/init.c

https://bitbucket.org/evzijst/gittest · C · 310 lines · 229 code · 52 blank · 29 comment · 22 complexity · a3a813e45c0088a3b187edc7f77125c9 MD5 · raw file

  1. /*
  2. * arch/s390/mm/init.c
  3. *
  4. * S390 version
  5. * Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
  6. * Author(s): Hartmut Penner (hp@de.ibm.com)
  7. *
  8. * Derived from "arch/i386/mm/init.c"
  9. * Copyright (C) 1995 Linus Torvalds
  10. */
  11. #include <linux/config.h>
  12. #include <linux/signal.h>
  13. #include <linux/sched.h>
  14. #include <linux/kernel.h>
  15. #include <linux/errno.h>
  16. #include <linux/string.h>
  17. #include <linux/types.h>
  18. #include <linux/ptrace.h>
  19. #include <linux/mman.h>
  20. #include <linux/mm.h>
  21. #include <linux/swap.h>
  22. #include <linux/smp.h>
  23. #include <linux/init.h>
  24. #include <linux/pagemap.h>
  25. #include <linux/bootmem.h>
  26. #include <asm/processor.h>
  27. #include <asm/system.h>
  28. #include <asm/uaccess.h>
  29. #include <asm/pgtable.h>
  30. #include <asm/pgalloc.h>
  31. #include <asm/dma.h>
  32. #include <asm/lowcore.h>
  33. #include <asm/tlb.h>
  34. #include <asm/tlbflush.h>
  35. DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
  36. pgd_t swapper_pg_dir[PTRS_PER_PGD] __attribute__((__aligned__(PAGE_SIZE)));
  37. char empty_zero_page[PAGE_SIZE] __attribute__((__aligned__(PAGE_SIZE)));
  38. void diag10(unsigned long addr)
  39. {
  40. if (addr >= 0x7ff00000)
  41. return;
  42. #ifdef __s390x__
  43. asm volatile (
  44. " sam31\n"
  45. " diag %0,%0,0x10\n"
  46. "0: sam64\n"
  47. ".section __ex_table,\"a\"\n"
  48. " .align 8\n"
  49. " .quad 0b, 0b\n"
  50. ".previous\n"
  51. : : "a" (addr));
  52. #else
  53. asm volatile (
  54. " diag %0,%0,0x10\n"
  55. "0:\n"
  56. ".section __ex_table,\"a\"\n"
  57. " .align 4\n"
  58. " .long 0b, 0b\n"
  59. ".previous\n"
  60. : : "a" (addr));
  61. #endif
  62. }
  63. void show_mem(void)
  64. {
  65. int i, total = 0, reserved = 0;
  66. int shared = 0, cached = 0;
  67. printk("Mem-info:\n");
  68. show_free_areas();
  69. printk("Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10));
  70. i = max_mapnr;
  71. while (i-- > 0) {
  72. total++;
  73. if (PageReserved(mem_map+i))
  74. reserved++;
  75. else if (PageSwapCache(mem_map+i))
  76. cached++;
  77. else if (page_count(mem_map+i))
  78. shared += page_count(mem_map+i) - 1;
  79. }
  80. printk("%d pages of RAM\n",total);
  81. printk("%d reserved pages\n",reserved);
  82. printk("%d pages shared\n",shared);
  83. printk("%d pages swap cached\n",cached);
  84. }
  85. /* References to section boundaries */
  86. extern unsigned long _text;
  87. extern unsigned long _etext;
  88. extern unsigned long _edata;
  89. extern unsigned long __bss_start;
  90. extern unsigned long _end;
  91. extern unsigned long __init_begin;
  92. extern unsigned long __init_end;
  93. /*
  94. * paging_init() sets up the page tables
  95. */
  96. #ifndef CONFIG_ARCH_S390X
  97. void __init paging_init(void)
  98. {
  99. pgd_t * pg_dir;
  100. pte_t * pg_table;
  101. pte_t pte;
  102. int i;
  103. unsigned long tmp;
  104. unsigned long pfn = 0;
  105. unsigned long pgdir_k = (__pa(swapper_pg_dir) & PAGE_MASK) | _KERNSEG_TABLE;
  106. static const int ssm_mask = 0x04000000L;
  107. /* unmap whole virtual address space */
  108. pg_dir = swapper_pg_dir;
  109. for (i=0;i<KERNEL_PGD_PTRS;i++)
  110. pmd_clear((pmd_t*)pg_dir++);
  111. /*
  112. * map whole physical memory to virtual memory (identity mapping)
  113. */
  114. pg_dir = swapper_pg_dir;
  115. while (pfn < max_low_pfn) {
  116. /*
  117. * pg_table is physical at this point
  118. */
  119. pg_table = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
  120. pg_dir->pgd0 = (_PAGE_TABLE | __pa(pg_table));
  121. pg_dir->pgd1 = (_PAGE_TABLE | (__pa(pg_table)+1024));
  122. pg_dir->pgd2 = (_PAGE_TABLE | (__pa(pg_table)+2048));
  123. pg_dir->pgd3 = (_PAGE_TABLE | (__pa(pg_table)+3072));
  124. pg_dir++;
  125. for (tmp = 0 ; tmp < PTRS_PER_PTE ; tmp++,pg_table++) {
  126. pte = pfn_pte(pfn, PAGE_KERNEL);
  127. if (pfn >= max_low_pfn)
  128. pte_clear(&init_mm, 0, &pte);
  129. set_pte(pg_table, pte);
  130. pfn++;
  131. }
  132. }
  133. S390_lowcore.kernel_asce = pgdir_k;
  134. /* enable virtual mapping in kernel mode */
  135. __asm__ __volatile__(" LCTL 1,1,%0\n"
  136. " LCTL 7,7,%0\n"
  137. " LCTL 13,13,%0\n"
  138. " SSM %1"
  139. : : "m" (pgdir_k), "m" (ssm_mask));
  140. local_flush_tlb();
  141. {
  142. unsigned long zones_size[MAX_NR_ZONES] = { 0, 0, 0};
  143. zones_size[ZONE_DMA] = max_low_pfn;
  144. free_area_init(zones_size);
  145. }
  146. return;
  147. }
  148. #else /* CONFIG_ARCH_S390X */
  149. void __init paging_init(void)
  150. {
  151. pgd_t * pg_dir;
  152. pmd_t * pm_dir;
  153. pte_t * pt_dir;
  154. pte_t pte;
  155. int i,j,k;
  156. unsigned long pfn = 0;
  157. unsigned long pgdir_k = (__pa(swapper_pg_dir) & PAGE_MASK) |
  158. _KERN_REGION_TABLE;
  159. static const int ssm_mask = 0x04000000L;
  160. unsigned long zones_size[MAX_NR_ZONES] = {0, 0, 0};
  161. unsigned long dma_pfn, high_pfn;
  162. dma_pfn = MAX_DMA_ADDRESS >> PAGE_SHIFT;
  163. high_pfn = max_low_pfn;
  164. if (dma_pfn > high_pfn)
  165. zones_size[ZONE_DMA] = high_pfn;
  166. else {
  167. zones_size[ZONE_DMA] = dma_pfn;
  168. zones_size[ZONE_NORMAL] = high_pfn - dma_pfn;
  169. }
  170. /* Initialize mem_map[]. */
  171. free_area_init(zones_size);
  172. /*
  173. * map whole physical memory to virtual memory (identity mapping)
  174. */
  175. pg_dir = swapper_pg_dir;
  176. for (i = 0 ; i < PTRS_PER_PGD ; i++,pg_dir++) {
  177. if (pfn >= max_low_pfn) {
  178. pgd_clear(pg_dir);
  179. continue;
  180. }
  181. pm_dir = (pmd_t *) alloc_bootmem_low_pages(PAGE_SIZE*4);
  182. pgd_populate(&init_mm, pg_dir, pm_dir);
  183. for (j = 0 ; j < PTRS_PER_PMD ; j++,pm_dir++) {
  184. if (pfn >= max_low_pfn) {
  185. pmd_clear(pm_dir);
  186. continue;
  187. }
  188. pt_dir = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
  189. pmd_populate_kernel(&init_mm, pm_dir, pt_dir);
  190. for (k = 0 ; k < PTRS_PER_PTE ; k++,pt_dir++) {
  191. pte = pfn_pte(pfn, PAGE_KERNEL);
  192. if (pfn >= max_low_pfn) {
  193. pte_clear(&init_mm, 0, &pte);
  194. continue;
  195. }
  196. set_pte(pt_dir, pte);
  197. pfn++;
  198. }
  199. }
  200. }
  201. S390_lowcore.kernel_asce = pgdir_k;
  202. /* enable virtual mapping in kernel mode */
  203. __asm__ __volatile__("lctlg 1,1,%0\n\t"
  204. "lctlg 7,7,%0\n\t"
  205. "lctlg 13,13,%0\n\t"
  206. "ssm %1"
  207. : :"m" (pgdir_k), "m" (ssm_mask));
  208. local_flush_tlb();
  209. return;
  210. }
  211. #endif /* CONFIG_ARCH_S390X */
  212. void __init mem_init(void)
  213. {
  214. unsigned long codesize, reservedpages, datasize, initsize;
  215. max_mapnr = num_physpages = max_low_pfn;
  216. high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
  217. /* clear the zero-page */
  218. memset(empty_zero_page, 0, PAGE_SIZE);
  219. /* this will put all low memory onto the freelists */
  220. totalram_pages += free_all_bootmem();
  221. reservedpages = 0;
  222. codesize = (unsigned long) &_etext - (unsigned long) &_text;
  223. datasize = (unsigned long) &_edata - (unsigned long) &_etext;
  224. initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
  225. printk("Memory: %luk/%luk available (%ldk kernel code, %ldk reserved, %ldk data, %ldk init)\n",
  226. (unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
  227. max_mapnr << (PAGE_SHIFT-10),
  228. codesize >> 10,
  229. reservedpages << (PAGE_SHIFT-10),
  230. datasize >>10,
  231. initsize >> 10);
  232. }
  233. void free_initmem(void)
  234. {
  235. unsigned long addr;
  236. addr = (unsigned long)(&__init_begin);
  237. for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
  238. ClearPageReserved(virt_to_page(addr));
  239. set_page_count(virt_to_page(addr), 1);
  240. free_page(addr);
  241. totalram_pages++;
  242. }
  243. printk ("Freeing unused kernel memory: %ldk freed\n",
  244. ((unsigned long)&__init_end - (unsigned long)&__init_begin) >> 10);
  245. }
  246. #ifdef CONFIG_BLK_DEV_INITRD
  247. void free_initrd_mem(unsigned long start, unsigned long end)
  248. {
  249. if (start < end)
  250. printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
  251. for (; start < end; start += PAGE_SIZE) {
  252. ClearPageReserved(virt_to_page(start));
  253. set_page_count(virt_to_page(start), 1);
  254. free_page(start);
  255. totalram_pages++;
  256. }
  257. }
  258. #endif