arch/arm-efika/boot/boot.c

   1 /*
   2     Copyright © 1995-2010, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc: boot.c
   6     Lang: english
   7 */
   8
   9 #include <inttypes.h>
  10 #include <asm/cpu.h>
  11 #include <asm/arm/mmu.h>
  12 #include <utility/tagitem.h>
  13 #include <aros/macros.h>
  14 #include <string.h>
  15 #include <stdlib.h>
  16
  17 #include "boot.h"
  18 #include "serialdebug.h"
  19 #include "atags.h"
  20 #include "elf.h"
  21
  22 asm("   .section .aros.startup          \n"
  23 "               .globl bootstrap                        \n"
  24 "               .type bootstrap,%function       \n"
  25 "bootstrap:                                                     \n"
  26 "               movw    r0,#:lower16:tmp_stack_ptr\n"
  27 "               movt    r0,#:upper16:tmp_stack_ptr\n"
  28 "               ldr             sp,[r0,#0]                      \n"
  29 "               b               boot                            \n"
  30 );
  31
  32 static __used unsigned char __stack[BOOT_STACK_SIZE];
  33 static __used void * tmp_stack_ptr = &__stack[BOOT_STACK_SIZE-16];
  34
  35 static struct TagItem tags[128];
  36 static struct TagItem *tag = &tags[0];
  37 static unsigned long *mem_upper = NULL;
  38 static unsigned long *mem_lower = NULL;
  39 static void *pkg_image;
  40 static uint32_t pkg_size;
  41
  42 static void parse_atags(struct tag *tags)
  43 {
  44         struct tag *t = NULL;
  45
  46         kprintf("[BOOT] Parsing ATAGS\n");
  47
  48         for_each_tag(t, tags)
  49         {
  50                 kprintf("[BOOT]   %08x (%04x): ", t->hdr.tag, t->hdr.size);
  51                 switch (t->hdr.tag)
  52                 {
  53                 case ATAG_MEM:
  54                         kprintf("Memory (%08x-%08x)\n", t->u.mem.start, t->u.mem.size + t->u.mem.start - 1);
  55                 tag->ti_Tag = KRN_MEMLower;
  56                 tag->ti_Data = t->u.mem.start;
  57                 mem_lower = &tag->ti_Data;
  58                 tag++;
  59
  60                 tag->ti_Tag = KRN_MEMUpper;
  61                 tag->ti_Data = t->u.mem.start + t->u.mem.size;
  62                 mem_upper = &tag->ti_Data;
  63                 tag++;
  64
  65                         break;
  66                 case ATAG_CMDLINE:
  67                 {
  68                         char *cmdline = malloc(strlen(t->u.cmdline.cmdline) + 1);
  69                         strcpy(cmdline, t->u.cmdline.cmdline);
  70                         kprintf("CMDLine: \"%s\"\n", cmdline);
  71
  72                         tag->ti_Tag = KRN_CmdLine;
  73                 tag->ti_Data = (intptr_t)cmdline;
  74                 tag++;
  75                 }
  76                         break;
  77                 case ATAG_INITRD2:
  78                         kprintf("RAMDISK: (%08x-%08x)\n", t->u.initrd.start, t->u.initrd.size + t->u.initrd.start - 1);
  79                         pkg_image = (void *)t->u.initrd.start;
  80                         pkg_size = t->u.initrd.size;
  81                         break;
  82                 default:
  83                         kprintf("IGN...\n");
  84                         break;
  85                 }
  86         }
  87 }
  88
  89 void setup_mmu(uintptr_t kernel_phys, uintptr_t kernel_virt, uintptr_t length)
  90 {
  91     int i;
  92     uintptr_t first_1M_page = kernel_virt & 0xfff00000;
  93     uintptr_t last_1M_page = ((kernel_virt + length + 0x000fffff) & 0xfff00000) - 1;
  94
  95     kprintf("[BOOT] Preparing initial MMU map\n");
  96
  97     /* Use memory right below kernel for page dir */
  98     pde_t *page_dir = (pde_t *)(((uintptr_t)kernel_phys - 16384) & ~ 16383);
  99
 100     kprintf("[BOOT] First level MMU page at %08x\n", page_dir);
 101
 102     /* Clear page dir */
 103     for (i=0; i < 4096; i++)
 104         page_dir[i].raw = 0;
 105
 106     /* 1:1 memory mapping */
 107     for (i=(*mem_lower >> 20); i < (*mem_upper >> 20); i++)
 108     {
 109         //page_dir[i].raw = 0;
 110         page_dir[i].section.type = PDE_TYPE_SECTION;
 111         page_dir[i].section.b = 0;
 112         page_dir[i].section.c = 1;      /* Cacheable */
 113         page_dir[i].section.ap = 3;     /* All can read&write */
 114         page_dir[i].section.base_address = i;
 115     }
 116
 117     /* 0x70000000 - 0x7fffffff */
 118     for (i = (0x70000000 >> 20); i < (0x80000000 >> 20); i++)
 119     {
 120         //page_dir[i].raw = 0;
 121         page_dir[i].section.type = PDE_TYPE_SECTION;
 122         page_dir[i].section.b = 1;      /* Shared device */
 123         page_dir[i].section.c = 0;      /* Non-Cacheable */
 124         page_dir[i].section.ap = 3;     /* All can read&write */
 125         page_dir[i].section.base_address = i;
 126     }
 127
 128     kprintf("[BOOT] Preparing mapping for kernel (%d bytes, pages %08x to %08x)\n",
 129             length, first_1M_page, last_1M_page);
 130
 131     int fp = first_1M_page >> 20;
 132     int lp = last_1M_page >> 20;
 133
 134     pte_t *current_pte = (pte_t *)page_dir;
 135
 136     if (lp == fp) lp++;
 137
 138     for (i = fp; i < lp; i++)
 139     {
 140         current_pte = (pte_t *)((uintptr_t)current_pte - 1024);
 141
 142         page_dir[i].coarse.type = PDE_TYPE_COARSE;
 143         page_dir[i].coarse.domain = 0;
 144         page_dir[i].coarse.sbz = 0;
 145         page_dir[i].coarse.imp = 0;
 146         page_dir[i].coarse.base_address = (intptr_t)current_pte >> 10;
 147
 148         int j;
 149         for (j = 0; j < 256; j++)
 150         {
 151             uintptr_t synth_addr = (i << 20) + (j << 12);
 152
 153             if (synth_addr < kernel_virt)
 154                 current_pte[j].raw = 0;
 155             else if (synth_addr < kernel_virt + length)
 156             {
 157                 current_pte[j].raw = 0;
 158                 current_pte[j].page.base_address = (synth_addr - kernel_virt + kernel_phys) >> 12;
 159                 current_pte[j].page.b = 0;
 160                 current_pte[j].page.c = 1;
 161                 current_pte[j].page.ap = 3;
 162                 current_pte[j].page.type = PTE_TYPE_PAGE;
 163             }
 164             else
 165                 current_pte[j].raw = 0;
 166         }
 167     }
 168
 169     /* Write page_dir address to ttbr0 */
 170     asm volatile ("mcr p15, 0, %0, c2, c0, 0"::"r"(page_dir));
 171     /* Write ttbr control N = 0 (use only ttbr0) */
 172     asm volatile ("mcr p15, 0, %0, c2, c0, 2"::"r"(0));
 173
 174     *mem_upper = (intptr_t)current_pte;
 175 }
 176
 177 void boot(uintptr_t dummy, uintptr_t arch, struct tag * atags)
 178 {
 179         uint32_t tmp;
 180         void (*entry)(struct TagItem *tags) = NULL;
 181
 182         /* Enable NEON and VFP */
 183     asm volatile ("mrc p15, 0, %0, c1, c0, 2":"=r"(tmp));
 184     tmp |= 3 << 20;
 185     tmp |= 3 << 22;
 186     asm volatile ("mcr p15, 0, %0, c1, c0, 2"::"r"(tmp));
 187
 188     fmxr(cr8, fmrx(cr8) | 1 << 30);
 189
 190     kprintf("[BOOT] AROS for EfikaMX bootstrap\n");
 191
 192     asm volatile ("mrc p15, 0, %0, c1, c0, 0":"=r"(tmp));
 193     kprintf("[BOOT] control register %08x\n", tmp);
 194     tmp &= ~2;          /* Disable MMU and caches */
 195     tmp |= 1 << 13;     /* Exception vectors at 0xffff0000 */
 196     asm volatile ("mcr p15, 0, %0, c1, c0, 0"::"r"(tmp));
 197
 198     asm volatile ("mrc p15, 0, %0, c1, c0, 0":"=r"(tmp));
 199         kprintf("[BOOT] control register %08x\n", tmp);
 200
 201     tag->ti_Tag = KRN_BootLoader;
 202     tag->ti_Data = (IPTR)"Bootstrap/EfikaMX ARM";
 203     tag++;
 204
 205     parse_atags(atags);
 206
 207     kprintf("[BOOT] Bootstrap @ %08x-%08x\n", &__bootstrap_start, &__bootstrap_end);
 208     kprintf("[BOOT] Topmost address for kernel: %p\n", *mem_upper);
 209
 210     if (*mem_upper)
 211     {
 212         *mem_upper = *mem_upper & ~4095;
 213
 214         unsigned long kernel_phys = *mem_upper;
 215         unsigned long kernel_virt = kernel_phys;
 216
 217         unsigned long total_size_ro, total_size_rw;
 218         uint32_t size_ro, size_rw;
 219
 220         /* Calculate total size of kernel and modules */
 221
 222         getElfSize(&_binary_kernel_bin_start, &size_rw, &size_ro);
 223
 224         total_size_ro = size_ro = (size_ro + 4095) & ~4095;
 225         total_size_rw = size_rw = (size_rw + 4095) & ~4095;
 226
 227         if (pkg_image && pkg_size)
 228         {
 229                 uint8_t *base = pkg_image;
 230
 231                 if (base[0] == 0x7f && base[1] == 'E' && base[2] == 'L' && base[3] == 'F')
 232                 {
 233                         kprintf("[BOOT] Kernel image is ELF file\n");
 234
 235                         getElfSize(base, &size_rw, &size_ro);
 236
 237                 total_size_ro += (size_ro + 4095) & ~4095;
 238                 total_size_rw += (size_rw + 4095) & ~4095;
 239                 }
 240                 else if (base[0] == 'P' && base[1] == 'K' && base[2] == 'G' && base[3] == 0x01)
 241                 {
 242                         kprintf("[BOOT] Kernel image is a package:\n");
 243
 244                         uint8_t *file = base+4;
 245                         uint32_t total_length = AROS_BE2LONG(*(uint32_t*)file); /* Total length of the module */
 246                         const uint8_t *file_end = base+total_length;
 247                         uint32_t len;
 248
 249                         kprintf("[BOOT] Package size: %dKB\n", total_length >> 10);
 250
 251                         file = base + 8;
 252
 253                         while(file < file_end)
 254                         {
 255                                 const char *filename = remove_path(file+4);
 256
 257                                 /* get text length */
 258                                 len = AROS_BE2LONG(*(uint32_t*)file);
 259                                 /* display the file name */
 260                                 kprintf("[BOOT]    %s \n", filename);
 261
 262                                 file += len + 5;
 263
 264                                 len = AROS_BE2LONG(*(uint32_t *)file);
 265                                 file += 4;
 266
 267                                 /* load it */
 268                                 getElfSize(file, &size_rw, &size_ro);
 269
 270                                 total_size_ro += (size_ro + 4095) & ~4095;
 271                                 total_size_rw += (size_rw + 4095) & ~4095;
 272
 273                                 /* go to the next file */
 274                                 file += len;
 275                         }
 276                 }
 277         }
 278
 279         kernel_phys = *mem_upper - total_size_ro - total_size_rw;
 280         kernel_virt = 0xffff0000 - total_size_ro - total_size_rw;
 281
 282         /* Adjust "top of memory" pointer */
 283         *mem_upper = kernel_phys;
 284
 285         kprintf("[BOOT] Physical address of kernel: %p\n", kernel_phys);
 286         kprintf("[BOOT] Virtual address of kernel: %p\n", kernel_virt);
 287
 288         entry = (void (*)(struct TagItem *))kernel_virt;
 289
 290         initAllocator(kernel_phys, kernel_phys  + total_size_ro, kernel_virt - kernel_phys);
 291
 292         tag->ti_Tag = KRN_KernelLowest;
 293         tag->ti_Data = kernel_phys;
 294         tag++;
 295
 296         tag->ti_Tag = KRN_KernelHighest;
 297         tag->ti_Data = kernel_phys + ((total_size_ro + 4095) & ~4095) + ((total_size_rw + 4095) & ~4095);
 298         tag++;
 299
 300         loadElf(&_binary_kernel_bin_start);
 301
 302         if (pkg_image && pkg_size)
 303         {
 304                 uint8_t *base = pkg_image;
 305
 306                 if (base[0] == 0x7f && base[1] == 'E' && base[2] == 'L' && base[3] == 'F')
 307                 {
 308                         kprintf("[BOOT] Kernel image is ELF file\n");
 309
 310                 /* load it */
 311                 loadElf(base);
 312                 }
 313                 else if (base[0] == 'P' && base[1] == 'K' && base[2] == 'G' && base[3] == 0x01)
 314                 {
 315                         kprintf("[BOOT] Kernel image is a package:\n");
 316
 317                         uint8_t *file = base+4;
 318                         uint32_t total_length = AROS_BE2LONG(*(uint32_t*)file); /* Total length of the module */
 319                         const uint8_t *file_end = base+total_length;
 320                         uint32_t len;
 321
 322                         kprintf("[BOOT] Package size: %dKB\n", total_length >> 10);
 323
 324                         file = base + 8;
 325
 326                         while(file < file_end)
 327                         {
 328                                 const char *filename = remove_path(file+4);
 329
 330                                 /* get text length */
 331                                 len = AROS_BE2LONG(*(uint32_t*)file);
 332                                 /* display the file name */
 333                                 kprintf("[BOOT]    %s ", filename);
 334
 335                                 file += len + 5;
 336
 337                                 len = AROS_BE2LONG(*(uint32_t *)file);
 338                                 file += 4;
 339
 340                                 /* load it */
 341                                 loadElf(file);
 342
 343                                 /* go to the next file */
 344                                 file += len;
 345                         }
 346                 }
 347         }
 348
 349         arm_flush_cache(kernel_phys, total_size_ro + total_size_rw);
 350
 351         tag->ti_Tag = KRN_KernelBss;
 352         tag->ti_Data = (IPTR)tracker;
 353         tag++;
 354
 355         setup_mmu(kernel_phys, kernel_virt, total_size_ro + total_size_rw);
 356     }
 357
 358     tag->ti_Tag = TAG_DONE;
 359     tag->ti_Data = 0;
 360
 361     kprintf("[BOOT] Kernel taglist contains %d entries\n", ((intptr_t)tag - (intptr_t)tags)/sizeof(struct TagItem));
 362     kprintf("[BOOT] Bootstrap wasted %d bytes of memory for kernels use\n", mem_used()   );
 363
 364     if (entry)
 365     {
 366         /* Set domains - Dom0 is usable, rest is disabled */
 367         asm volatile ("mrc p15, 0, %0, c3, c0, 0":"=r"(tmp));
 368         kprintf("[BOOT] Domain access control register: %08x\n", tmp);
 369         asm volatile ("mcr p15, 0, %0, c3, c0, 0"::"r"(0x00000001));
 370
 371         asm volatile ("mrc p15, 0, %0, c1, c0, 0":"=r"(tmp));
 372         kprintf("[BOOT] control register %08x\n", tmp);
 373         tmp |= 1;          /* Enable MMU */
 374         asm volatile ("mcr p15, 0, %0, c1, c0, 0"::"r"(tmp));
 375
 376         asm volatile ("mrc p15, 0, %0, c1, c0, 0":"=r"(tmp));
 377         kprintf("[BOOT] control register %08x\n", tmp);
 378
 379         kprintf("[BOOT] Heading over to AROS kernel @ %08x\n", entry);
 380
 381         entry(tags);
 382
 383         kprintf("[BOOT] Back? Something wrong happened...\n");
 384     }
 385     else
 386     {
 387         kprintf("[BOOT] kernel entry pointer not set?\n");
 388     }
 389
 390     while(1);
 391 }