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/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);