Adrian Bunk | 88278ca | 2008-05-19 16:53:02 -0700 | [diff] [blame] | 1 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Robert Reif | f538f3d | 2008-07-14 22:57:29 -0700 | [diff] [blame] | 25 | #include <linux/pagemap.h> |
Robert Reif | 1aa0365f | 2008-09-03 16:29:42 -0700 | [diff] [blame] | 26 | #include <linux/poison.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 27 | #include <linux/gfp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | |
Sam Ravnborg | 86ed40b | 2008-12-27 00:35:12 -0800 | [diff] [blame] | 29 | #include <asm/sections.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 */ |
Sam Ravnborg | d191723 | 2014-04-21 21:39:28 +0200 | [diff] [blame] | 34 | #include <asm/setup.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | #include <asm/tlb.h> |
David S. Miller | 942a6bd | 2006-06-23 15:53:31 -0700 | [diff] [blame] | 36 | #include <asm/prom.h> |
Konrad Eisele | 0fd7ef1 | 2009-08-17 00:13:31 +0000 | [diff] [blame] | 37 | #include <asm/leon.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | |
Sam Ravnborg | e8c29c8 | 2014-04-21 21:39:19 +0200 | [diff] [blame] | 39 | #include "mm_32.h" |
| 40 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | unsigned long *sparc_valid_addr_bitmap; |
Sam Ravnborg | 6943f3d | 2009-01-08 16:58:05 -0800 | [diff] [blame] | 42 | EXPORT_SYMBOL(sparc_valid_addr_bitmap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | |
| 44 | unsigned long phys_base; |
Sam Ravnborg | 6943f3d | 2009-01-08 16:58:05 -0800 | [diff] [blame] | 45 | EXPORT_SYMBOL(phys_base); |
| 46 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | unsigned long pfn_base; |
Sam Ravnborg | 6943f3d | 2009-01-08 16:58:05 -0800 | [diff] [blame] | 48 | EXPORT_SYMBOL(pfn_base); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | struct sparc_phys_banks sp_banks[SPARC_PHYS_BANKS+1]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
David Rientjes | b2b755b | 2011-03-24 15:18:15 -0700 | [diff] [blame] | 58 | void show_mem(unsigned int filter) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | { |
| 60 | printk("Mem-info:\n"); |
David Rientjes | 7bf02ea | 2011-05-24 17:11:16 -0700 | [diff] [blame] | 61 | show_free_areas(filter); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | printk("Free swap: %6ldkB\n", |
Shaohua Li | ec8acf2 | 2013-02-22 16:34:38 -0800 | [diff] [blame] | 63 | get_nr_swap_pages() << (PAGE_SHIFT-10)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | printk("%ld pages of RAM\n", totalram_pages); |
Al Viro | f0f0d0c | 2007-03-14 09:18:50 +0000 | [diff] [blame] | 65 | printk("%ld free pages\n", nr_free_pages()); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | } |
| 67 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Adrian Bunk | 50215d6 | 2008-06-05 11:41:51 -0700 | [diff] [blame] | 92 | static unsigned long calc_max_low_pfn(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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) { |
David S. Miller | efb8963 | 2007-08-20 15:52:18 -0700 | [diff] [blame] | 170 | if (sparc_ramdisk_image >= (unsigned long)&_end - 2 * PAGE_SIZE) |
| 171 | sparc_ramdisk_image -= KERNBASE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
Bernhard Walle | 72a7fe3 | 2008-02-07 00:15:17 -0800 | [diff] [blame] | 223 | reserve_bootmem(initrd_start, size, BOOTMEM_DEFAULT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
Bernhard Walle | 72a7fe3 | 2008-02-07 00:15:17 -0800 | [diff] [blame] | 232 | reserve_bootmem(phys_base, size, BOOTMEM_DEFAULT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
Bernhard Walle | 72a7fe3 | 2008-02-07 00:15:17 -0800 | [diff] [blame] | 240 | reserve_bootmem((bootmap_pfn << PAGE_SHIFT), size, BOOTMEM_DEFAULT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | *pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT; |
| 242 | |
| 243 | return max_pfn; |
| 244 | } |
| 245 | |
| 246 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | void __init paging_init(void) |
| 252 | { |
Sam Ravnborg | cc52aea | 2012-07-26 11:02:22 +0000 | [diff] [blame] | 253 | srmmu_paging_init(); |
David S. Miller | 942a6bd | 2006-06-23 15:53:31 -0700 | [diff] [blame] | 254 | prom_build_devicetree(); |
David S. Miller | 890db40 | 2009-04-01 03:13:15 -0700 | [diff] [blame] | 255 | of_fill_in_cpu_data(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | device_scan(); |
| 257 | } |
| 258 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Adrian Bunk | 50215d6 | 2008-06-05 11:41:51 -0700 | [diff] [blame] | 276 | static void map_high_region(unsigned long start_pfn, unsigned long end_pfn) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Jiang Liu | 32e1a10 | 2013-04-29 15:07:10 -0700 | [diff] [blame] | 284 | for (tmp = start_pfn; tmp < end_pfn; tmp++) |
| 285 | free_highmem_page(pfn_to_page(tmp)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | } |
| 287 | |
| 288 | void __init mem_init(void) |
| 289 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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); |
Jiang Liu | 0c98853 | 2013-07-03 15:03:24 -0700 | [diff] [blame] | 321 | free_all_bootmem(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Jiang Liu | dceccbe | 2013-07-03 15:04:14 -0700 | [diff] [blame] | 336 | mem_init_print_info(NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | } |
| 338 | |
| 339 | void free_initmem (void) |
| 340 | { |
Jiang Liu | dceccbe | 2013-07-03 15:04:14 -0700 | [diff] [blame] | 341 | free_initmem_default(POISON_FREE_INITMEM); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | } |
| 343 | |
| 344 | #ifdef CONFIG_BLK_DEV_INITRD |
| 345 | void free_initrd_mem(unsigned long start, unsigned long end) |
| 346 | { |
Jiang Liu | dceccbe | 2013-07-03 15:04:14 -0700 | [diff] [blame] | 347 | free_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM, |
| 348 | "initrd"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | } |
Sam Ravnborg | 6943f3d | 2009-01-08 16:58:05 -0800 | [diff] [blame] | 359 | EXPORT_SYMBOL(sparc_flush_page_to_ram); |