1 /* 2 * linux/arch/sparc/mm/init.c 3 * 4 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) 5 * Copyright (C) 1995 Eddie C. Dost (ecd@skynet.be) 6 * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) 7 * Copyright (C) 2000 Anton Blanchard (anton@samba.org) 8 */ 9 10 #include <linux/module.h> 11 #include <linux/signal.h> 12 #include <linux/sched.h> 13 #include <linux/kernel.h> 14 #include <linux/errno.h> 15 #include <linux/string.h> 16 #include <linux/types.h> 17 #include <linux/ptrace.h> 18 #include <linux/mman.h> 19 #include <linux/mm.h> 20 #include <linux/swap.h> 21 #include <linux/initrd.h> 22 #include <linux/init.h> 23 #include <linux/highmem.h> 24 #include <linux/bootmem.h> 25 #include <linux/pagemap.h> 26 #include <linux/poison.h> 27 #include <linux/gfp.h> 28 29 #include <asm/sections.h> 30 #include <asm/page.h> 31 #include <asm/pgtable.h> 32 #include <asm/vaddrs.h> 33 #include <asm/pgalloc.h> /* bug in asm-generic/tlb.h: check_pgt_cache */ 34 #include <asm/tlb.h> 35 #include <asm/prom.h> 36 #include <asm/leon.h> 37 38 unsigned long *sparc_valid_addr_bitmap; 39 EXPORT_SYMBOL(sparc_valid_addr_bitmap); 40 41 unsigned long phys_base; 42 EXPORT_SYMBOL(phys_base); 43 44 unsigned long pfn_base; 45 EXPORT_SYMBOL(pfn_base); 46 47 struct sparc_phys_banks sp_banks[SPARC_PHYS_BANKS+1]; 48 unsigned long sparc_unmapped_base; 49 50 struct pgtable_cache_struct pgt_quicklists; 51 52 /* Initial ramdisk setup */ 53 extern unsigned int sparc_ramdisk_image; 54 extern unsigned int sparc_ramdisk_size; 55 56 unsigned long highstart_pfn, highend_pfn; 57 58 pte_t *kmap_pte; 59 pgprot_t kmap_prot; 60 61 #define kmap_get_fixmap_pte(vaddr) \ 62 pte_offset_kernel(pmd_offset(pgd_offset_k(vaddr), (vaddr)), (vaddr)) 63 64 void __init kmap_init(void) 65 { 66 /* cache the first kmap pte */ 67 kmap_pte = kmap_get_fixmap_pte(__fix_to_virt(FIX_KMAP_BEGIN)); 68 kmap_prot = __pgprot(SRMMU_ET_PTE | SRMMU_PRIV | SRMMU_CACHE); 69 } 70 71 void show_mem(unsigned int filter) 72 { 73 printk("Mem-info:\n"); 74 show_free_areas(filter); 75 printk("Free swap: %6ldkB\n", 76 nr_swap_pages << (PAGE_SHIFT-10)); 77 printk("%ld pages of RAM\n", totalram_pages); 78 printk("%ld free pages\n", nr_free_pages()); 79 #if 0 /* undefined pgtable_cache_size, pgd_cache_size */ 80 printk("%ld pages in page table cache\n",pgtable_cache_size); 81 #ifndef CONFIG_SMP 82 if (sparc_cpu_model == sun4m || sparc_cpu_model == sun4d) 83 printk("%ld entries in page dir cache\n",pgd_cache_size); 84 #endif 85 #endif 86 } 87 88 void __init sparc_context_init(int numctx) 89 { 90 int ctx; 91 92 ctx_list_pool = __alloc_bootmem(numctx * sizeof(struct ctx_list), SMP_CACHE_BYTES, 0UL); 93 94 for(ctx = 0; ctx < numctx; ctx++) { 95 struct ctx_list *clist; 96 97 clist = (ctx_list_pool + ctx); 98 clist->ctx_number = ctx; 99 clist->ctx_mm = NULL; 100 } 101 ctx_free.next = ctx_free.prev = &ctx_free; 102 ctx_used.next = ctx_used.prev = &ctx_used; 103 for(ctx = 0; ctx < numctx; ctx++) 104 add_to_free_ctxlist(ctx_list_pool + ctx); 105 } 106 107 extern unsigned long cmdline_memory_size; 108 unsigned long last_valid_pfn; 109 110 unsigned long calc_highpages(void) 111 { 112 int i; 113 int nr = 0; 114 115 for (i = 0; sp_banks[i].num_bytes != 0; i++) { 116 unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT; 117 unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT; 118 119 if (end_pfn <= max_low_pfn) 120 continue; 121 122 if (start_pfn < max_low_pfn) 123 start_pfn = max_low_pfn; 124 125 nr += end_pfn - start_pfn; 126 } 127 128 return nr; 129 } 130 131 static unsigned long calc_max_low_pfn(void) 132 { 133 int i; 134 unsigned long tmp = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT); 135 unsigned long curr_pfn, last_pfn; 136 137 last_pfn = (sp_banks[0].base_addr + sp_banks[0].num_bytes) >> PAGE_SHIFT; 138 for (i = 1; sp_banks[i].num_bytes != 0; i++) { 139 curr_pfn = sp_banks[i].base_addr >> PAGE_SHIFT; 140 141 if (curr_pfn >= tmp) { 142 if (last_pfn < tmp) 143 tmp = last_pfn; 144 break; 145 } 146 147 last_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT; 148 } 149 150 return tmp; 151 } 152 153 unsigned long __init bootmem_init(unsigned long *pages_avail) 154 { 155 unsigned long bootmap_size, start_pfn; 156 unsigned long end_of_phys_memory = 0UL; 157 unsigned long bootmap_pfn, bytes_avail, size; 158 int i; 159 160 bytes_avail = 0UL; 161 for (i = 0; sp_banks[i].num_bytes != 0; i++) { 162 end_of_phys_memory = sp_banks[i].base_addr + 163 sp_banks[i].num_bytes; 164 bytes_avail += sp_banks[i].num_bytes; 165 if (cmdline_memory_size) { 166 if (bytes_avail > cmdline_memory_size) { 167 unsigned long slack = bytes_avail - cmdline_memory_size; 168 169 bytes_avail -= slack; 170 end_of_phys_memory -= slack; 171 172 sp_banks[i].num_bytes -= slack; 173 if (sp_banks[i].num_bytes == 0) { 174 sp_banks[i].base_addr = 0xdeadbeef; 175 } else { 176 sp_banks[i+1].num_bytes = 0; 177 sp_banks[i+1].base_addr = 0xdeadbeef; 178 } 179 break; 180 } 181 } 182 } 183 184 /* Start with page aligned address of last symbol in kernel 185 * image. 186 */ 187 start_pfn = (unsigned long)__pa(PAGE_ALIGN((unsigned long) &_end)); 188 189 /* Now shift down to get the real physical page frame number. */ 190 start_pfn >>= PAGE_SHIFT; 191 192 bootmap_pfn = start_pfn; 193 194 max_pfn = end_of_phys_memory >> PAGE_SHIFT; 195 196 max_low_pfn = max_pfn; 197 highstart_pfn = highend_pfn = max_pfn; 198 199 if (max_low_pfn > pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT)) { 200 highstart_pfn = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT); 201 max_low_pfn = calc_max_low_pfn(); 202 printk(KERN_NOTICE "%ldMB HIGHMEM available.\n", 203 calc_highpages() >> (20 - PAGE_SHIFT)); 204 } 205 206 #ifdef CONFIG_BLK_DEV_INITRD 207 /* Now have to check initial ramdisk, so that bootmap does not overwrite it */ 208 if (sparc_ramdisk_image) { 209 if (sparc_ramdisk_image >= (unsigned long)&_end - 2 * PAGE_SIZE) 210 sparc_ramdisk_image -= KERNBASE; 211 initrd_start = sparc_ramdisk_image + phys_base; 212 initrd_end = initrd_start + sparc_ramdisk_size; 213 if (initrd_end > end_of_phys_memory) { 214 printk(KERN_CRIT "initrd extends beyond end of memory " 215 "(0x%016lx > 0x%016lx)\ndisabling initrd\n", 216 initrd_end, end_of_phys_memory); 217 initrd_start = 0; 218 } 219 if (initrd_start) { 220 if (initrd_start >= (start_pfn << PAGE_SHIFT) && 221 initrd_start < (start_pfn << PAGE_SHIFT) + 2 * PAGE_SIZE) 222 bootmap_pfn = PAGE_ALIGN (initrd_end) >> PAGE_SHIFT; 223 } 224 } 225 #endif 226 /* Initialize the boot-time allocator. */ 227 bootmap_size = init_bootmem_node(NODE_DATA(0), bootmap_pfn, pfn_base, 228 max_low_pfn); 229 230 /* Now register the available physical memory with the 231 * allocator. 232 */ 233 *pages_avail = 0; 234 for (i = 0; sp_banks[i].num_bytes != 0; i++) { 235 unsigned long curr_pfn, last_pfn; 236 237 curr_pfn = sp_banks[i].base_addr >> PAGE_SHIFT; 238 if (curr_pfn >= max_low_pfn) 239 break; 240 241 last_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT; 242 if (last_pfn > max_low_pfn) 243 last_pfn = max_low_pfn; 244 245 /* 246 * .. finally, did all the rounding and playing 247 * around just make the area go away? 248 */ 249 if (last_pfn <= curr_pfn) 250 continue; 251 252 size = (last_pfn - curr_pfn) << PAGE_SHIFT; 253 *pages_avail += last_pfn - curr_pfn; 254 255 free_bootmem(sp_banks[i].base_addr, size); 256 } 257 258 #ifdef CONFIG_BLK_DEV_INITRD 259 if (initrd_start) { 260 /* Reserve the initrd image area. */ 261 size = initrd_end - initrd_start; 262 reserve_bootmem(initrd_start, size, BOOTMEM_DEFAULT); 263 *pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT; 264 265 initrd_start = (initrd_start - phys_base) + PAGE_OFFSET; 266 initrd_end = (initrd_end - phys_base) + PAGE_OFFSET; 267 } 268 #endif 269 /* Reserve the kernel text/data/bss. */ 270 size = (start_pfn << PAGE_SHIFT) - phys_base; 271 reserve_bootmem(phys_base, size, BOOTMEM_DEFAULT); 272 *pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT; 273 274 /* Reserve the bootmem map. We do not account for it 275 * in pages_avail because we will release that memory 276 * in free_all_bootmem. 277 */ 278 size = bootmap_size; 279 reserve_bootmem((bootmap_pfn << PAGE_SHIFT), size, BOOTMEM_DEFAULT); 280 *pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT; 281 282 return max_pfn; 283 } 284 285 /* 286 * paging_init() sets up the page tables: We call the MMU specific 287 * init routine based upon the Sun model type on the Sparc. 288 * 289 */ 290 extern void srmmu_paging_init(void); 291 extern void device_scan(void); 292 293 void __init paging_init(void) 294 { 295 switch(sparc_cpu_model) { 296 case sparc_leon: 297 leon_init(); 298 /* fall through */ 299 case sun4m: 300 case sun4d: 301 srmmu_paging_init(); 302 sparc_unmapped_base = 0x50000000; 303 break; 304 default: 305 prom_printf("paging_init: Cannot init paging on this Sparc\n"); 306 prom_printf("paging_init: sparc_cpu_model = %d\n", sparc_cpu_model); 307 prom_printf("paging_init: Halting...\n"); 308 prom_halt(); 309 } 310 311 prom_build_devicetree(); 312 of_fill_in_cpu_data(); 313 device_scan(); 314 } 315 316 static void __init taint_real_pages(void) 317 { 318 int i; 319 320 for (i = 0; sp_banks[i].num_bytes; i++) { 321 unsigned long start, end; 322 323 start = sp_banks[i].base_addr; 324 end = start + sp_banks[i].num_bytes; 325 326 while (start < end) { 327 set_bit(start >> 20, sparc_valid_addr_bitmap); 328 start += PAGE_SIZE; 329 } 330 } 331 } 332 333 static void map_high_region(unsigned long start_pfn, unsigned long end_pfn) 334 { 335 unsigned long tmp; 336 337 #ifdef CONFIG_DEBUG_HIGHMEM 338 printk("mapping high region %08lx - %08lx\n", start_pfn, end_pfn); 339 #endif 340 341 for (tmp = start_pfn; tmp < end_pfn; tmp++) { 342 struct page *page = pfn_to_page(tmp); 343 344 ClearPageReserved(page); 345 init_page_count(page); 346 __free_page(page); 347 totalhigh_pages++; 348 } 349 } 350 351 void __init mem_init(void) 352 { 353 int codepages = 0; 354 int datapages = 0; 355 int initpages = 0; 356 int reservedpages = 0; 357 int i; 358 359 if (PKMAP_BASE+LAST_PKMAP*PAGE_SIZE >= FIXADDR_START) { 360 prom_printf("BUG: fixmap and pkmap areas overlap\n"); 361 prom_printf("pkbase: 0x%lx pkend: 0x%lx fixstart 0x%lx\n", 362 PKMAP_BASE, 363 (unsigned long)PKMAP_BASE+LAST_PKMAP*PAGE_SIZE, 364 FIXADDR_START); 365 prom_printf("Please mail sparclinux@vger.kernel.org.\n"); 366 prom_halt(); 367 } 368 369 370 /* Saves us work later. */ 371 memset((void *)&empty_zero_page, 0, PAGE_SIZE); 372 373 i = last_valid_pfn >> ((20 - PAGE_SHIFT) + 5); 374 i += 1; 375 sparc_valid_addr_bitmap = (unsigned long *) 376 __alloc_bootmem(i << 2, SMP_CACHE_BYTES, 0UL); 377 378 if (sparc_valid_addr_bitmap == NULL) { 379 prom_printf("mem_init: Cannot alloc valid_addr_bitmap.\n"); 380 prom_halt(); 381 } 382 memset(sparc_valid_addr_bitmap, 0, i << 2); 383 384 taint_real_pages(); 385 386 max_mapnr = last_valid_pfn - pfn_base; 387 high_memory = __va(max_low_pfn << PAGE_SHIFT); 388 389 totalram_pages = free_all_bootmem(); 390 391 for (i = 0; sp_banks[i].num_bytes != 0; i++) { 392 unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT; 393 unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT; 394 395 num_physpages += sp_banks[i].num_bytes >> PAGE_SHIFT; 396 397 if (end_pfn <= highstart_pfn) 398 continue; 399 400 if (start_pfn < highstart_pfn) 401 start_pfn = highstart_pfn; 402 403 map_high_region(start_pfn, end_pfn); 404 } 405 406 totalram_pages += totalhigh_pages; 407 408 codepages = (((unsigned long) &_etext) - ((unsigned long)&_start)); 409 codepages = PAGE_ALIGN(codepages) >> PAGE_SHIFT; 410 datapages = (((unsigned long) &_edata) - ((unsigned long)&_etext)); 411 datapages = PAGE_ALIGN(datapages) >> PAGE_SHIFT; 412 initpages = (((unsigned long) &__init_end) - ((unsigned long) &__init_begin)); 413 initpages = PAGE_ALIGN(initpages) >> PAGE_SHIFT; 414 415 /* Ignore memory holes for the purpose of counting reserved pages */ 416 for (i=0; i < max_low_pfn; i++) 417 if (test_bit(i >> (20 - PAGE_SHIFT), sparc_valid_addr_bitmap) 418 && PageReserved(pfn_to_page(i))) 419 reservedpages++; 420 421 printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, %dk reserved, %dk data, %dk init, %ldk highmem)\n", 422 nr_free_pages() << (PAGE_SHIFT-10), 423 num_physpages << (PAGE_SHIFT - 10), 424 codepages << (PAGE_SHIFT-10), 425 reservedpages << (PAGE_SHIFT - 10), 426 datapages << (PAGE_SHIFT-10), 427 initpages << (PAGE_SHIFT-10), 428 totalhigh_pages << (PAGE_SHIFT-10)); 429 } 430 431 void free_initmem (void) 432 { 433 unsigned long addr; 434 unsigned long freed; 435 436 addr = (unsigned long)(&__init_begin); 437 freed = (unsigned long)(&__init_end) - addr; 438 for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) { 439 struct page *p; 440 441 memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE); 442 p = virt_to_page(addr); 443 444 ClearPageReserved(p); 445 init_page_count(p); 446 __free_page(p); 447 totalram_pages++; 448 num_physpages++; 449 } 450 printk(KERN_INFO "Freeing unused kernel memory: %ldk freed\n", 451 freed >> 10); 452 } 453 454 #ifdef CONFIG_BLK_DEV_INITRD 455 void free_initrd_mem(unsigned long start, unsigned long end) 456 { 457 if (start < end) 458 printk(KERN_INFO "Freeing initrd memory: %ldk freed\n", 459 (end - start) >> 10); 460 for (; start < end; start += PAGE_SIZE) { 461 struct page *p; 462 463 memset((void *)start, POISON_FREE_INITMEM, PAGE_SIZE); 464 p = virt_to_page(start); 465 466 ClearPageReserved(p); 467 init_page_count(p); 468 __free_page(p); 469 totalram_pages++; 470 num_physpages++; 471 } 472 } 473 #endif 474 475 void sparc_flush_page_to_ram(struct page *page) 476 { 477 unsigned long vaddr = (unsigned long)page_address(page); 478 479 if (vaddr) 480 __flush_page_to_ram(vaddr); 481 } 482 EXPORT_SYMBOL(sparc_flush_page_to_ram); 483