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  1. /*
  2.  * Copyright (C) 2005 Martin Decky
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. #include "main.h"
  30. #include "printf.h"
  31. #include "asm.h"
  32.  
  33. #define KERNEL_START ((void *) &_binary_____________kernel_kernel_bin_start)
  34. #define KERNEL_END ((void *) &_binary_____________kernel_kernel_bin_end)
  35. #define KERNEL_SIZE ((unsigned int) KERNEL_END - (unsigned int) KERNEL_START)
  36.  
  37. #define HEAP_GAP 1024000
  38.  
  39. memmap_t memmap;
  40.  
  41.  
  42. static void check_align(const void *addr, const char *desc)
  43. {
  44.     if ((unsigned int) addr % PAGE_SIZE != 0) {
  45.         printf("Error: %s not on page boundary\n", desc);
  46.         halt();
  47.     }
  48. }
  49.  
  50.  
  51. static void fix_overlap(void *va, void **pa, const char *desc, unsigned int *top)
  52. {
  53.     if ((unsigned int) *pa + PAGE_SIZE < *top) {
  54.         printf("Warning: %s overlaps kernel physical area\n", desc);
  55.        
  56.         void *new_va = (void *) (ALIGN_UP((unsigned int) KERNEL_END + HEAP_GAP, PAGE_SIZE) + *top);
  57.         void *new_pa = (void *) (HEAP_GAP + *top);
  58.         *top += PAGE_SIZE;
  59.        
  60.         if (ofw_map(new_pa, new_va, PAGE_SIZE, 0) != 0) {
  61.             printf("Error: Unable to map page aligned memory at %L (physical %L)\n", new_va, new_pa);
  62.             halt();
  63.         }
  64.        
  65.         if ((unsigned int) new_pa + PAGE_SIZE < KERNEL_SIZE) {
  66.             printf("Error: %s cannot be relocated\n", desc);
  67.             halt();
  68.         }
  69.        
  70.         printf("Relocating %L -> %L (physical %L -> %L)\n", va, new_va, *pa, new_pa);
  71.         *pa = new_pa;
  72.         memcpy(new_va, va, PAGE_SIZE);
  73.     }
  74. }
  75.  
  76.  
  77. void bootstrap(void)
  78. {
  79.     printf("\nHelenOS PPC Bootloader\n");
  80.    
  81.     check_align(KERNEL_START, "Kernel image");
  82.     check_align(&real_mode, "Bootstrap trampoline");
  83.     check_align(&trans, "Translation table");
  84.    
  85.     if (!ofw_memmap(&memmap)) {
  86.         printf("Error: Unable to get memory map\n");
  87.         halt();
  88.     }
  89.    
  90.     void *real_mode_pa = ofw_translate(&real_mode);
  91.     void *trans_pa = ofw_translate(&trans);
  92.     void *memmap_pa = ofw_translate(&memmap);
  93.    
  94.     printf("Memory statistics (total %d MB)\n", memmap.total >> 20);
  95.     printf(" kernel image         at %L (size %d bytes)\n", KERNEL_START, KERNEL_SIZE);
  96.     printf(" memory map           at %L (physical %L)\n", &memmap, memmap_pa);
  97.     printf(" bootstrap trampoline at %L (physical %L)\n", &real_mode, real_mode_pa);
  98.     printf(" translation table    at %L (physical %L)\n", &trans, trans_pa);
  99.    
  100.     unsigned int top = ALIGN_UP(KERNEL_SIZE, PAGE_SIZE);
  101.     unsigned int addr;
  102.     for (addr = 0; addr < KERNEL_SIZE; addr += PAGE_SIZE) {
  103.         void *pa = ofw_translate(KERNEL_START + addr);
  104.         fix_overlap(KERNEL_START + addr, &pa, "Kernel image", &top);
  105.         trans[addr >> PAGE_WIDTH] = pa;
  106.     }
  107.    
  108.     fix_overlap(&real_mode, &real_mode_pa, "Bootstrap trampoline", &top);
  109.     fix_overlap(&trans, &trans_pa, "Translation table", &top);
  110.     fix_overlap(&memmap, &memmap_pa, "Memory map", &top);
  111.    
  112.     printf("Booting the kernel...\n");
  113.     jump_to_kernel(memmap_pa, trans_pa, KERNEL_SIZE, real_mode_pa);
  114. }
  115.