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 49 /* Initial ramdisk setup */ 50 extern unsigned int sparc_ramdisk_image; 51 extern unsigned int sparc_ramdisk_size; 52 53 unsigned long highstart_pfn, highend_pfn; 54 55 void show_mem(unsigned int filter) 56 { 57 printk("Mem-info:\n"); 58 show_free_areas(filter); 59 printk("Free swap: %6ldkB\n", 60 get_nr_swap_pages() << (PAGE_SHIFT-10)); 61 printk("%ld pages of RAM\n", totalram_pages); 62 printk("%ld free pages\n", nr_free_pages()); 63 } 64 65 66 extern unsigned long cmdline_memory_size; 67 unsigned long last_valid_pfn; 68 69 unsigned long calc_highpages(void) 70 { 71 int i; 72 int nr = 0; 73 74 for (i = 0; sp_banks[i].num_bytes != 0; i++) { 75 unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT; 76 unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT; 77 78 if (end_pfn <= max_low_pfn) 79 continue; 80 81 if (start_pfn < max_low_pfn) 82 start_pfn = max_low_pfn; 83 84 nr += end_pfn - start_pfn; 85 } 86 87 return nr; 88 } 89 90 static unsigned long calc_max_low_pfn(void) 91 { 92 int i; 93 unsigned long tmp = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT); 94 unsigned long curr_pfn, last_pfn; 95 96 last_pfn = (sp_banks[0].base_addr + sp_banks[0].num_bytes) >> PAGE_SHIFT; 97 for (i = 1; sp_banks[i].num_bytes != 0; i++) { 98 curr_pfn = sp_banks[i].base_addr >> PAGE_SHIFT; 99 100 if (curr_pfn >= tmp) { 101 if (last_pfn < tmp) 102 tmp = last_pfn; 103 break; 104 } 105 106 last_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT; 107 } 108 109 return tmp; 110 } 111 112 unsigned long __init bootmem_init(unsigned long *pages_avail) 113 { 114 unsigned long bootmap_size, start_pfn; 115 unsigned long end_of_phys_memory = 0UL; 116 unsigned long bootmap_pfn, bytes_avail, size; 117 int i; 118 119 bytes_avail = 0UL; 120 for (i = 0; sp_banks[i].num_bytes != 0; i++) { 121 end_of_phys_memory = sp_banks[i].base_addr + 122 sp_banks[i].num_bytes; 123 bytes_avail += sp_banks[i].num_bytes; 124 if (cmdline_memory_size) { 125 if (bytes_avail > cmdline_memory_size) { 126 unsigned long slack = bytes_avail - cmdline_memory_size; 127 128 bytes_avail -= slack; 129 end_of_phys_memory -= slack; 130 131 sp_banks[i].num_bytes -= slack; 132 if (sp_banks[i].num_bytes == 0) { 133 sp_banks[i].base_addr = 0xdeadbeef; 134 } else { 135 sp_banks[i+1].num_bytes = 0; 136 sp_banks[i+1].base_addr = 0xdeadbeef; 137 } 138 break; 139 } 140 } 141 } 142 143 /* Start with page aligned address of last symbol in kernel 144 * image. 145 */ 146 start_pfn = (unsigned long)__pa(PAGE_ALIGN((unsigned long) &_end)); 147 148 /* Now shift down to get the real physical page frame number. */ 149 start_pfn >>= PAGE_SHIFT; 150 151 bootmap_pfn = start_pfn; 152 153 max_pfn = end_of_phys_memory >> PAGE_SHIFT; 154 155 max_low_pfn = max_pfn; 156 highstart_pfn = highend_pfn = max_pfn; 157 158 if (max_low_pfn > pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT)) { 159 highstart_pfn = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT); 160 max_low_pfn = calc_max_low_pfn(); 161 printk(KERN_NOTICE "%ldMB HIGHMEM available.\n", 162 calc_highpages() >> (20 - PAGE_SHIFT)); 163 } 164 165 #ifdef CONFIG_BLK_DEV_INITRD 166 /* Now have to check initial ramdisk, so that bootmap does not overwrite it */ 167 if (sparc_ramdisk_image) { 168 if (sparc_ramdisk_image >= (unsigned long)&_end - 2 * PAGE_SIZE) 169 sparc_ramdisk_image -= KERNBASE; 170 initrd_start = sparc_ramdisk_image + phys_base; 171 initrd_end = initrd_start + sparc_ramdisk_size; 172 if (initrd_end > end_of_phys_memory) { 173 printk(KERN_CRIT "initrd extends beyond end of memory " 174 "(0x%016lx > 0x%016lx)\ndisabling initrd\n", 175 initrd_end, end_of_phys_memory); 176 initrd_start = 0; 177 } 178 if (initrd_start) { 179 if (initrd_start >= (start_pfn << PAGE_SHIFT) && 180 initrd_start < (start_pfn << PAGE_SHIFT) + 2 * PAGE_SIZE) 181 bootmap_pfn = PAGE_ALIGN (initrd_end) >> PAGE_SHIFT; 182 } 183 } 184 #endif 185 /* Initialize the boot-time allocator. */ 186 bootmap_size = init_bootmem_node(NODE_DATA(0), bootmap_pfn, pfn_base, 187 max_low_pfn); 188 189 /* Now register the available physical memory with the 190 * allocator. 191 */ 192 *pages_avail = 0; 193 for (i = 0; sp_banks[i].num_bytes != 0; i++) { 194 unsigned long curr_pfn, last_pfn; 195 196 curr_pfn = sp_banks[i].base_addr >> PAGE_SHIFT; 197 if (curr_pfn >= max_low_pfn) 198 break; 199 200 last_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT; 201 if (last_pfn > max_low_pfn) 202 last_pfn = max_low_pfn; 203 204 /* 205 * .. finally, did all the rounding and playing 206 * around just make the area go away? 207 */ 208 if (last_pfn <= curr_pfn) 209 continue; 210 211 size = (last_pfn - curr_pfn) << PAGE_SHIFT; 212 *pages_avail += last_pfn - curr_pfn; 213 214 free_bootmem(sp_banks[i].base_addr, size); 215 } 216 217 #ifdef CONFIG_BLK_DEV_INITRD 218 if (initrd_start) { 219 /* Reserve the initrd image area. */ 220 size = initrd_end - initrd_start; 221 reserve_bootmem(initrd_start, size, BOOTMEM_DEFAULT); 222 *pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT; 223 224 initrd_start = (initrd_start - phys_base) + PAGE_OFFSET; 225 initrd_end = (initrd_end - phys_base) + PAGE_OFFSET; 226 } 227 #endif 228 /* Reserve the kernel text/data/bss. */ 229 size = (start_pfn << PAGE_SHIFT) - phys_base; 230 reserve_bootmem(phys_base, size, BOOTMEM_DEFAULT); 231 *pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT; 232 233 /* Reserve the bootmem map. We do not account for it 234 * in pages_avail because we will release that memory 235 * in free_all_bootmem. 236 */ 237 size = bootmap_size; 238 reserve_bootmem((bootmap_pfn << PAGE_SHIFT), size, BOOTMEM_DEFAULT); 239 *pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT; 240 241 return max_pfn; 242 } 243 244 /* 245 * paging_init() sets up the page tables: We call the MMU specific 246 * init routine based upon the Sun model type on the Sparc. 247 * 248 */ 249 extern void srmmu_paging_init(void); 250 extern void device_scan(void); 251 252 void __init paging_init(void) 253 { 254 srmmu_paging_init(); 255 prom_build_devicetree(); 256 of_fill_in_cpu_data(); 257 device_scan(); 258 } 259 260 static void __init taint_real_pages(void) 261 { 262 int i; 263 264 for (i = 0; sp_banks[i].num_bytes; i++) { 265 unsigned long start, end; 266 267 start = sp_banks[i].base_addr; 268 end = start + sp_banks[i].num_bytes; 269 270 while (start < end) { 271 set_bit(start >> 20, sparc_valid_addr_bitmap); 272 start += PAGE_SIZE; 273 } 274 } 275 } 276 277 static void map_high_region(unsigned long start_pfn, unsigned long end_pfn) 278 { 279 unsigned long tmp; 280 281 #ifdef CONFIG_DEBUG_HIGHMEM 282 printk("mapping high region %08lx - %08lx\n", start_pfn, end_pfn); 283 #endif 284 285 for (tmp = start_pfn; tmp < end_pfn; tmp++) 286 free_highmem_page(pfn_to_page(tmp)); 287 } 288 289 void __init mem_init(void) 290 { 291 int i; 292 293 if (PKMAP_BASE+LAST_PKMAP*PAGE_SIZE >= FIXADDR_START) { 294 prom_printf("BUG: fixmap and pkmap areas overlap\n"); 295 prom_printf("pkbase: 0x%lx pkend: 0x%lx fixstart 0x%lx\n", 296 PKMAP_BASE, 297 (unsigned long)PKMAP_BASE+LAST_PKMAP*PAGE_SIZE, 298 FIXADDR_START); 299 prom_printf("Please mail sparclinux@vger.kernel.org.\n"); 300 prom_halt(); 301 } 302 303 304 /* Saves us work later. */ 305 memset((void *)&empty_zero_page, 0, PAGE_SIZE); 306 307 i = last_valid_pfn >> ((20 - PAGE_SHIFT) + 5); 308 i += 1; 309 sparc_valid_addr_bitmap = (unsigned long *) 310 __alloc_bootmem(i << 2, SMP_CACHE_BYTES, 0UL); 311 312 if (sparc_valid_addr_bitmap == NULL) { 313 prom_printf("mem_init: Cannot alloc valid_addr_bitmap.\n"); 314 prom_halt(); 315 } 316 memset(sparc_valid_addr_bitmap, 0, i << 2); 317 318 taint_real_pages(); 319 320 max_mapnr = last_valid_pfn - pfn_base; 321 high_memory = __va(max_low_pfn << PAGE_SHIFT); 322 free_all_bootmem(); 323 324 for (i = 0; sp_banks[i].num_bytes != 0; i++) { 325 unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT; 326 unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT; 327 328 if (end_pfn <= highstart_pfn) 329 continue; 330 331 if (start_pfn < highstart_pfn) 332 start_pfn = highstart_pfn; 333 334 map_high_region(start_pfn, end_pfn); 335 } 336 337 mem_init_print_info(NULL); 338 } 339 340 void free_initmem (void) 341 { 342 free_initmem_default(POISON_FREE_INITMEM); 343 } 344 345 #ifdef CONFIG_BLK_DEV_INITRD 346 void free_initrd_mem(unsigned long start, unsigned long end) 347 { 348 free_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM, 349 "initrd"); 350 } 351 #endif 352 353 void sparc_flush_page_to_ram(struct page *page) 354 { 355 unsigned long vaddr = (unsigned long)page_address(page); 356 357 if (vaddr) 358 __flush_page_to_ram(vaddr); 359 } 360 EXPORT_SYMBOL(sparc_flush_page_to_ram); 361