kernel/arch/sparc/mm/init_32.c

   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);