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/setup.h> 35 #include <asm/tlb.h> 36 #include <asm/prom.h> 37 #include <asm/leon.h> 38 39 #include "mm_32.h" 40 41 unsigned long *sparc_valid_addr_bitmap; 42 EXPORT_SYMBOL(sparc_valid_addr_bitmap); 43 44 unsigned long phys_base; 45 EXPORT_SYMBOL(phys_base); 46 47 unsigned long pfn_base; 48 EXPORT_SYMBOL(pfn_base); 49 50 struct sparc_phys_banks sp_banks[SPARC_PHYS_BANKS+1]; 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 void show_mem(unsigned int filter) 59 { 60 printk("Mem-info:\n"); 61 show_free_areas(filter); 62 printk("Free swap: %6ldkB\n", 63 get_nr_swap_pages() << (PAGE_SHIFT-10)); 64 printk("%ld pages of RAM\n", totalram_pages); 65 printk("%ld free pages\n", nr_free_pages()); 66 } 67 68 69 unsigned long last_valid_pfn; 70 71 unsigned long calc_highpages(void) 72 { 73 int i; 74 int nr = 0; 75 76 for (i = 0; sp_banks[i].num_bytes != 0; i++) { 77 unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT; 78 unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT; 79 80 if (end_pfn <= max_low_pfn) 81 continue; 82 83 if (start_pfn < max_low_pfn) 84 start_pfn = max_low_pfn; 85 86 nr += end_pfn - start_pfn; 87 } 88 89 return nr; 90 } 91 92 static unsigned long calc_max_low_pfn(void) 93 { 94 int i; 95 unsigned long tmp = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT); 96 unsigned long curr_pfn, last_pfn; 97 98 last_pfn = (sp_banks[0].base_addr + sp_banks[0].num_bytes) >> PAGE_SHIFT; 99 for (i = 1; sp_banks[i].num_bytes != 0; i++) { 100 curr_pfn = sp_banks[i].base_addr >> PAGE_SHIFT; 101 102 if (curr_pfn >= tmp) { 103 if (last_pfn < tmp) 104 tmp = last_pfn; 105 break; 106 } 107 108 last_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT; 109 } 110 111 return tmp; 112 } 113 114 unsigned long __init bootmem_init(unsigned long *pages_avail) 115 { 116 unsigned long bootmap_size, start_pfn; 117 unsigned long end_of_phys_memory = 0UL; 118 unsigned long bootmap_pfn, bytes_avail, size; 119 int i; 120 121 bytes_avail = 0UL; 122 for (i = 0; sp_banks[i].num_bytes != 0; i++) { 123 end_of_phys_memory = sp_banks[i].base_addr + 124 sp_banks[i].num_bytes; 125 bytes_avail += sp_banks[i].num_bytes; 126 if (cmdline_memory_size) { 127 if (bytes_avail > cmdline_memory_size) { 128 unsigned long slack = bytes_avail - cmdline_memory_size; 129 130 bytes_avail -= slack; 131 end_of_phys_memory -= slack; 132 133 sp_banks[i].num_bytes -= slack; 134 if (sp_banks[i].num_bytes == 0) { 135 sp_banks[i].base_addr = 0xdeadbeef; 136 } else { 137 sp_banks[i+1].num_bytes = 0; 138 sp_banks[i+1].base_addr = 0xdeadbeef; 139 } 140 break; 141 } 142 } 143 } 144 145 /* Start with page aligned address of last symbol in kernel 146 * image. 147 */ 148 start_pfn = (unsigned long)__pa(PAGE_ALIGN((unsigned long) &_end)); 149 150 /* Now shift down to get the real physical page frame number. */ 151 start_pfn >>= PAGE_SHIFT; 152 153 bootmap_pfn = start_pfn; 154 155 max_pfn = end_of_phys_memory >> PAGE_SHIFT; 156 157 max_low_pfn = max_pfn; 158 highstart_pfn = highend_pfn = max_pfn; 159 160 if (max_low_pfn > pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT)) { 161 highstart_pfn = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT); 162 max_low_pfn = calc_max_low_pfn(); 163 printk(KERN_NOTICE "%ldMB HIGHMEM available.\n", 164 calc_highpages() >> (20 - PAGE_SHIFT)); 165 } 166 167 #ifdef CONFIG_BLK_DEV_INITRD 168 /* Now have to check initial ramdisk, so that bootmap does not overwrite it */ 169 if (sparc_ramdisk_image) { 170 if (sparc_ramdisk_image >= (unsigned long)&_end - 2 * PAGE_SIZE) 171 sparc_ramdisk_image -= KERNBASE; 172 initrd_start = sparc_ramdisk_image + phys_base; 173 initrd_end = initrd_start + sparc_ramdisk_size; 174 if (initrd_end > end_of_phys_memory) { 175 printk(KERN_CRIT "initrd extends beyond end of memory " 176 "(0x%016lx > 0x%016lx)\ndisabling initrd\n", 177 initrd_end, end_of_phys_memory); 178 initrd_start = 0; 179 } 180 if (initrd_start) { 181 if (initrd_start >= (start_pfn << PAGE_SHIFT) && 182 initrd_start < (start_pfn << PAGE_SHIFT) + 2 * PAGE_SIZE) 183 bootmap_pfn = PAGE_ALIGN (initrd_end) >> PAGE_SHIFT; 184 } 185 } 186 #endif 187 /* Initialize the boot-time allocator. */ 188 bootmap_size = init_bootmem_node(NODE_DATA(0), bootmap_pfn, pfn_base, 189 max_low_pfn); 190 191 /* Now register the available physical memory with the 192 * allocator. 193 */ 194 *pages_avail = 0; 195 for (i = 0; sp_banks[i].num_bytes != 0; i++) { 196 unsigned long curr_pfn, last_pfn; 197 198 curr_pfn = sp_banks[i].base_addr >> PAGE_SHIFT; 199 if (curr_pfn >= max_low_pfn) 200 break; 201 202 last_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT; 203 if (last_pfn > max_low_pfn) 204 last_pfn = max_low_pfn; 205 206 /* 207 * .. finally, did all the rounding and playing 208 * around just make the area go away? 209 */ 210 if (last_pfn <= curr_pfn) 211 continue; 212 213 size = (last_pfn - curr_pfn) << PAGE_SHIFT; 214 *pages_avail += last_pfn - curr_pfn; 215 216 free_bootmem(sp_banks[i].base_addr, size); 217 } 218 219 #ifdef CONFIG_BLK_DEV_INITRD 220 if (initrd_start) { 221 /* Reserve the initrd image area. */ 222 size = initrd_end - initrd_start; 223 reserve_bootmem(initrd_start, size, BOOTMEM_DEFAULT); 224 *pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT; 225 226 initrd_start = (initrd_start - phys_base) + PAGE_OFFSET; 227 initrd_end = (initrd_end - phys_base) + PAGE_OFFSET; 228 } 229 #endif 230 /* Reserve the kernel text/data/bss. */ 231 size = (start_pfn << PAGE_SHIFT) - phys_base; 232 reserve_bootmem(phys_base, size, BOOTMEM_DEFAULT); 233 *pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT; 234 235 /* Reserve the bootmem map. We do not account for it 236 * in pages_avail because we will release that memory 237 * in free_all_bootmem. 238 */ 239 size = bootmap_size; 240 reserve_bootmem((bootmap_pfn << PAGE_SHIFT), size, BOOTMEM_DEFAULT); 241 *pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT; 242 243 return max_pfn; 244 } 245 246 /* 247 * paging_init() sets up the page tables: We call the MMU specific 248 * init routine based upon the Sun model type on the Sparc. 249 * 250 */ 251 void __init paging_init(void) 252 { 253 srmmu_paging_init(); 254 prom_build_devicetree(); 255 of_fill_in_cpu_data(); 256 device_scan(); 257 } 258 259 static void __init taint_real_pages(void) 260 { 261 int i; 262 263 for (i = 0; sp_banks[i].num_bytes; i++) { 264 unsigned long start, end; 265 266 start = sp_banks[i].base_addr; 267 end = start + sp_banks[i].num_bytes; 268 269 while (start < end) { 270 set_bit(start >> 20, sparc_valid_addr_bitmap); 271 start += PAGE_SIZE; 272 } 273 } 274 } 275 276 static void map_high_region(unsigned long start_pfn, unsigned long end_pfn) 277 { 278 unsigned long tmp; 279 280 #ifdef CONFIG_DEBUG_HIGHMEM 281 printk("mapping high region %08lx - %08lx\n", start_pfn, end_pfn); 282 #endif 283 284 for (tmp = start_pfn; tmp < end_pfn; tmp++) 285 free_highmem_page(pfn_to_page(tmp)); 286 } 287 288 void __init mem_init(void) 289 { 290 int i; 291 292 if (PKMAP_BASE+LAST_PKMAP*PAGE_SIZE >= FIXADDR_START) { 293 prom_printf("BUG: fixmap and pkmap areas overlap\n"); 294 prom_printf("pkbase: 0x%lx pkend: 0x%lx fixstart 0x%lx\n", 295 PKMAP_BASE, 296 (unsigned long)PKMAP_BASE+LAST_PKMAP*PAGE_SIZE, 297 FIXADDR_START); 298 prom_printf("Please mail sparclinux@vger.kernel.org.\n"); 299 prom_halt(); 300 } 301 302 303 /* Saves us work later. */ 304 memset((void *)&empty_zero_page, 0, PAGE_SIZE); 305 306 i = last_valid_pfn >> ((20 - PAGE_SHIFT) + 5); 307 i += 1; 308 sparc_valid_addr_bitmap = (unsigned long *) 309 __alloc_bootmem(i << 2, SMP_CACHE_BYTES, 0UL); 310 311 if (sparc_valid_addr_bitmap == NULL) { 312 prom_printf("mem_init: Cannot alloc valid_addr_bitmap.\n"); 313 prom_halt(); 314 } 315 memset(sparc_valid_addr_bitmap, 0, i << 2); 316 317 taint_real_pages(); 318 319 max_mapnr = last_valid_pfn - pfn_base; 320 high_memory = __va(max_low_pfn << PAGE_SHIFT); 321 free_all_bootmem(); 322 323 for (i = 0; sp_banks[i].num_bytes != 0; i++) { 324 unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT; 325 unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT; 326 327 if (end_pfn <= highstart_pfn) 328 continue; 329 330 if (start_pfn < highstart_pfn) 331 start_pfn = highstart_pfn; 332 333 map_high_region(start_pfn, end_pfn); 334 } 335 336 mem_init_print_info(NULL); 337 } 338 339 void free_initmem (void) 340 { 341 free_initmem_default(POISON_FREE_INITMEM); 342 } 343 344 #ifdef CONFIG_BLK_DEV_INITRD 345 void free_initrd_mem(unsigned long start, unsigned long end) 346 { 347 free_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM, 348 "initrd"); 349 } 350 #endif 351 352 void sparc_flush_page_to_ram(struct page *page) 353 { 354 unsigned long vaddr = (unsigned long)page_address(page); 355 356 if (vaddr) 357 __flush_page_to_ram(vaddr); 358 } 359 EXPORT_SYMBOL(sparc_flush_page_to_ram); 360