1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * linux/arch/sparc/mm/init.c 4 * 5 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) 6 * Copyright (C) 1995 Eddie C. Dost (ecd@skynet.be) 7 * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) 8 * Copyright (C) 2000 Anton Blanchard (anton@samba.org) 9 */ 10 11 #include <linux/module.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/initrd.h> 23 #include <linux/init.h> 24 #include <linux/highmem.h> 25 #include <linux/bootmem.h> 26 #include <linux/pagemap.h> 27 #include <linux/poison.h> 28 #include <linux/gfp.h> 29 30 #include <asm/sections.h> 31 #include <asm/page.h> 32 #include <asm/pgtable.h> 33 #include <asm/vaddrs.h> 34 #include <asm/pgalloc.h> /* bug in asm-generic/tlb.h: check_pgt_cache */ 35 #include <asm/setup.h> 36 #include <asm/tlb.h> 37 #include <asm/prom.h> 38 #include <asm/leon.h> 39 40 #include "mm_32.h" 41 42 unsigned long *sparc_valid_addr_bitmap; 43 EXPORT_SYMBOL(sparc_valid_addr_bitmap); 44 45 unsigned long phys_base; 46 EXPORT_SYMBOL(phys_base); 47 48 unsigned long pfn_base; 49 EXPORT_SYMBOL(pfn_base); 50 51 struct sparc_phys_banks sp_banks[SPARC_PHYS_BANKS+1]; 52 53 /* Initial ramdisk setup */ 54 extern unsigned int sparc_ramdisk_image; 55 extern unsigned int sparc_ramdisk_size; 56 57 unsigned long highstart_pfn, highend_pfn; 58 59 unsigned long last_valid_pfn; 60 61 unsigned long calc_highpages(void) 62 { 63 int i; 64 int nr = 0; 65 66 for (i = 0; sp_banks[i].num_bytes != 0; i++) { 67 unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT; 68 unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT; 69 70 if (end_pfn <= max_low_pfn) 71 continue; 72 73 if (start_pfn < max_low_pfn) 74 start_pfn = max_low_pfn; 75 76 nr += end_pfn - start_pfn; 77 } 78 79 return nr; 80 } 81 82 static unsigned long calc_max_low_pfn(void) 83 { 84 int i; 85 unsigned long tmp = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT); 86 unsigned long curr_pfn, last_pfn; 87 88 last_pfn = (sp_banks[0].base_addr + sp_banks[0].num_bytes) >> PAGE_SHIFT; 89 for (i = 1; sp_banks[i].num_bytes != 0; i++) { 90 curr_pfn = sp_banks[i].base_addr >> PAGE_SHIFT; 91 92 if (curr_pfn >= tmp) { 93 if (last_pfn < tmp) 94 tmp = last_pfn; 95 break; 96 } 97 98 last_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT; 99 } 100 101 return tmp; 102 } 103 104 unsigned long __init bootmem_init(unsigned long *pages_avail) 105 { 106 unsigned long bootmap_size, start_pfn; 107 unsigned long end_of_phys_memory = 0UL; 108 unsigned long bootmap_pfn, bytes_avail, size; 109 int i; 110 111 bytes_avail = 0UL; 112 for (i = 0; sp_banks[i].num_bytes != 0; i++) { 113 end_of_phys_memory = sp_banks[i].base_addr + 114 sp_banks[i].num_bytes; 115 bytes_avail += sp_banks[i].num_bytes; 116 if (cmdline_memory_size) { 117 if (bytes_avail > cmdline_memory_size) { 118 unsigned long slack = bytes_avail - cmdline_memory_size; 119 120 bytes_avail -= slack; 121 end_of_phys_memory -= slack; 122 123 sp_banks[i].num_bytes -= slack; 124 if (sp_banks[i].num_bytes == 0) { 125 sp_banks[i].base_addr = 0xdeadbeef; 126 } else { 127 sp_banks[i+1].num_bytes = 0; 128 sp_banks[i+1].base_addr = 0xdeadbeef; 129 } 130 break; 131 } 132 } 133 } 134 135 /* Start with page aligned address of last symbol in kernel 136 * image. 137 */ 138 start_pfn = (unsigned long)__pa(PAGE_ALIGN((unsigned long) &_end)); 139 140 /* Now shift down to get the real physical page frame number. */ 141 start_pfn >>= PAGE_SHIFT; 142 143 bootmap_pfn = start_pfn; 144 145 max_pfn = end_of_phys_memory >> PAGE_SHIFT; 146 147 max_low_pfn = max_pfn; 148 highstart_pfn = highend_pfn = max_pfn; 149 150 if (max_low_pfn > pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT)) { 151 highstart_pfn = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT); 152 max_low_pfn = calc_max_low_pfn(); 153 printk(KERN_NOTICE "%ldMB HIGHMEM available.\n", 154 calc_highpages() >> (20 - PAGE_SHIFT)); 155 } 156 157 #ifdef CONFIG_BLK_DEV_INITRD 158 /* Now have to check initial ramdisk, so that bootmap does not overwrite it */ 159 if (sparc_ramdisk_image) { 160 if (sparc_ramdisk_image >= (unsigned long)&_end - 2 * PAGE_SIZE) 161 sparc_ramdisk_image -= KERNBASE; 162 initrd_start = sparc_ramdisk_image + phys_base; 163 initrd_end = initrd_start + sparc_ramdisk_size; 164 if (initrd_end > end_of_phys_memory) { 165 printk(KERN_CRIT "initrd extends beyond end of memory " 166 "(0x%016lx > 0x%016lx)\ndisabling initrd\n", 167 initrd_end, end_of_phys_memory); 168 initrd_start = 0; 169 } 170 if (initrd_start) { 171 if (initrd_start >= (start_pfn << PAGE_SHIFT) && 172 initrd_start < (start_pfn << PAGE_SHIFT) + 2 * PAGE_SIZE) 173 bootmap_pfn = PAGE_ALIGN (initrd_end) >> PAGE_SHIFT; 174 } 175 } 176 #endif 177 /* Initialize the boot-time allocator. */ 178 bootmap_size = init_bootmem_node(NODE_DATA(0), bootmap_pfn, pfn_base, 179 max_low_pfn); 180 181 /* Now register the available physical memory with the 182 * allocator. 183 */ 184 *pages_avail = 0; 185 for (i = 0; sp_banks[i].num_bytes != 0; i++) { 186 unsigned long curr_pfn, last_pfn; 187 188 curr_pfn = sp_banks[i].base_addr >> PAGE_SHIFT; 189 if (curr_pfn >= max_low_pfn) 190 break; 191 192 last_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT; 193 if (last_pfn > max_low_pfn) 194 last_pfn = max_low_pfn; 195 196 /* 197 * .. finally, did all the rounding and playing 198 * around just make the area go away? 199 */ 200 if (last_pfn <= curr_pfn) 201 continue; 202 203 size = (last_pfn - curr_pfn) << PAGE_SHIFT; 204 *pages_avail += last_pfn - curr_pfn; 205 206 free_bootmem(sp_banks[i].base_addr, size); 207 } 208 209 #ifdef CONFIG_BLK_DEV_INITRD 210 if (initrd_start) { 211 /* Reserve the initrd image area. */ 212 size = initrd_end - initrd_start; 213 reserve_bootmem(initrd_start, size, BOOTMEM_DEFAULT); 214 *pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT; 215 216 initrd_start = (initrd_start - phys_base) + PAGE_OFFSET; 217 initrd_end = (initrd_end - phys_base) + PAGE_OFFSET; 218 } 219 #endif 220 /* Reserve the kernel text/data/bss. */ 221 size = (start_pfn << PAGE_SHIFT) - phys_base; 222 reserve_bootmem(phys_base, size, BOOTMEM_DEFAULT); 223 *pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT; 224 225 /* Reserve the bootmem map. We do not account for it 226 * in pages_avail because we will release that memory 227 * in free_all_bootmem. 228 */ 229 size = bootmap_size; 230 reserve_bootmem((bootmap_pfn << PAGE_SHIFT), size, BOOTMEM_DEFAULT); 231 *pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT; 232 233 return max_pfn; 234 } 235 236 /* 237 * paging_init() sets up the page tables: We call the MMU specific 238 * init routine based upon the Sun model type on the Sparc. 239 * 240 */ 241 void __init paging_init(void) 242 { 243 srmmu_paging_init(); 244 prom_build_devicetree(); 245 of_fill_in_cpu_data(); 246 device_scan(); 247 } 248 249 static void __init taint_real_pages(void) 250 { 251 int i; 252 253 for (i = 0; sp_banks[i].num_bytes; i++) { 254 unsigned long start, end; 255 256 start = sp_banks[i].base_addr; 257 end = start + sp_banks[i].num_bytes; 258 259 while (start < end) { 260 set_bit(start >> 20, sparc_valid_addr_bitmap); 261 start += PAGE_SIZE; 262 } 263 } 264 } 265 266 static void map_high_region(unsigned long start_pfn, unsigned long end_pfn) 267 { 268 unsigned long tmp; 269 270 #ifdef CONFIG_DEBUG_HIGHMEM 271 printk("mapping high region %08lx - %08lx\n", start_pfn, end_pfn); 272 #endif 273 274 for (tmp = start_pfn; tmp < end_pfn; tmp++) 275 free_highmem_page(pfn_to_page(tmp)); 276 } 277 278 void __init mem_init(void) 279 { 280 int i; 281 282 if (PKMAP_BASE+LAST_PKMAP*PAGE_SIZE >= FIXADDR_START) { 283 prom_printf("BUG: fixmap and pkmap areas overlap\n"); 284 prom_printf("pkbase: 0x%lx pkend: 0x%lx fixstart 0x%lx\n", 285 PKMAP_BASE, 286 (unsigned long)PKMAP_BASE+LAST_PKMAP*PAGE_SIZE, 287 FIXADDR_START); 288 prom_printf("Please mail sparclinux@vger.kernel.org.\n"); 289 prom_halt(); 290 } 291 292 293 /* Saves us work later. */ 294 memset((void *)empty_zero_page, 0, PAGE_SIZE); 295 296 i = last_valid_pfn >> ((20 - PAGE_SHIFT) + 5); 297 i += 1; 298 sparc_valid_addr_bitmap = (unsigned long *) 299 __alloc_bootmem(i << 2, SMP_CACHE_BYTES, 0UL); 300 301 if (sparc_valid_addr_bitmap == NULL) { 302 prom_printf("mem_init: Cannot alloc valid_addr_bitmap.\n"); 303 prom_halt(); 304 } 305 memset(sparc_valid_addr_bitmap, 0, i << 2); 306 307 taint_real_pages(); 308 309 max_mapnr = last_valid_pfn - pfn_base; 310 high_memory = __va(max_low_pfn << PAGE_SHIFT); 311 free_all_bootmem(); 312 313 for (i = 0; sp_banks[i].num_bytes != 0; i++) { 314 unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT; 315 unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT; 316 317 if (end_pfn <= highstart_pfn) 318 continue; 319 320 if (start_pfn < highstart_pfn) 321 start_pfn = highstart_pfn; 322 323 map_high_region(start_pfn, end_pfn); 324 } 325 326 mem_init_print_info(NULL); 327 } 328 329 void free_initmem (void) 330 { 331 free_initmem_default(POISON_FREE_INITMEM); 332 } 333 334 #ifdef CONFIG_BLK_DEV_INITRD 335 void free_initrd_mem(unsigned long start, unsigned long end) 336 { 337 free_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM, 338 "initrd"); 339 } 340 #endif 341 342 void sparc_flush_page_to_ram(struct page *page) 343 { 344 unsigned long vaddr = (unsigned long)page_address(page); 345 346 if (vaddr) 347 __flush_page_to_ram(vaddr); 348 } 349 EXPORT_SYMBOL(sparc_flush_page_to_ram); 350