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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 INIT_START ((void *) &_binary_____________uspace_init_init_start)
  38. #define INIT_END ((void *) &_binary_____________uspace_init_init_end)
  39. #define INIT_SIZE ((unsigned int) INIT_END - (unsigned int) INIT_START)
  40.  
  41. #define HEAP_GAP 1024000
  42.  
  43. bootinfo_t bootinfo;
  44.  
  45.  
  46. static void check_align(const void *addr, const char *desc)
  47. {
  48.     if ((unsigned int) addr % PAGE_SIZE != 0) {
  49.         printf("Error: %s not on page boundary, halting.\n", desc);
  50.         halt();
  51.     }
  52. }
  53.  
  54.  
  55. static void fix_overlap(void *va, void **pa, const char *desc, unsigned int *top)
  56. {
  57.     if ((unsigned int) *pa + PAGE_SIZE < *top) {
  58.         printf("Warning: %s overlaps kernel physical area\n", desc);
  59.        
  60.         void *new_va = (void *) (ALIGN_UP((unsigned int) KERNEL_END + HEAP_GAP, PAGE_SIZE) + *top);
  61.         void *new_pa = (void *) (HEAP_GAP + *top);
  62.         *top += PAGE_SIZE;
  63.        
  64.         if (ofw_map(new_pa, new_va, PAGE_SIZE, 0) != 0) {
  65.             printf("Error: Unable to map page aligned memory at %L (physical %L), halting.\n", new_va, new_pa);
  66.             halt();
  67.         }
  68.        
  69.         if ((unsigned int) new_pa + PAGE_SIZE < KERNEL_SIZE) {
  70.             printf("Error: %s cannot be relocated, halting.\n", desc);
  71.             halt();
  72.         }
  73.        
  74.         printf("Relocating %L -> %L (physical %L -> %L)\n", va, new_va, *pa, new_pa);
  75.         *pa = new_pa;
  76.         memcpy(new_va, va, PAGE_SIZE);
  77.     }
  78. }
  79.  
  80.  
  81. void bootstrap(void)
  82. {
  83.     printf("\nHelenOS PPC Bootloader\n");
  84.    
  85.     check_align(KERNEL_START, "Kernel image");
  86.     check_align(INIT_START, "Init image");
  87.     check_align(&real_mode, "Bootstrap trampoline");
  88.     check_align(&trans, "Translation table");
  89.    
  90.     if (!ofw_memmap(&bootinfo.memmap)) {
  91.         printf("Error: Unable to get memory map, halting.\n");
  92.         halt();
  93.     }
  94.    
  95.     if (bootinfo.memmap.total == 0) {
  96.         printf("Error: No memory detected, halting.\n");
  97.         halt();
  98.     }
  99.    
  100.     if (!ofw_screen(&bootinfo.screen)) {
  101.         printf("Error: Unable to get screen properties, halting.\n");
  102.         halt();
  103.     }
  104.    
  105.     printf("\nDevice statistics\n");
  106.     printf(" screen at %L, resolution %dx%d, %d bpp (scanline %d bytes)\n", bootinfo.screen.addr, bootinfo.screen.width, bootinfo.screen.height, bootinfo.screen.bpp, bootinfo.screen.scanline);
  107.    
  108.     void *real_mode_pa = ofw_translate(&real_mode);
  109.     void *trans_pa = ofw_translate(&trans);
  110.     void *bootinfo_pa = ofw_translate(&bootinfo);
  111.     void *fb = (void *) (((unsigned int) bootinfo.screen.addr) & ((unsigned int) ~0 << 17));
  112.    
  113.     printf("\nMemory statistics (total %d MB)\n", bootinfo.memmap.total >> 20);
  114.     printf(" kernel image         at %L (size %d bytes)\n", KERNEL_START, KERNEL_SIZE);
  115.     printf(" init image           at %L (size %d bytes)\n", INIT_START, INIT_SIZE);
  116.     printf(" boot info structure  at %L (physical %L)\n", &bootinfo, bootinfo_pa);
  117.     printf(" bootstrap trampoline at %L (physical %L)\n", &real_mode, real_mode_pa);
  118.     printf(" translation table    at %L (physical %L)\n", &trans, trans_pa);
  119.    
  120.     unsigned int top = ALIGN_UP(KERNEL_SIZE, PAGE_SIZE) + ALIGN_UP(INIT_SIZE, PAGE_SIZE);
  121.     unsigned int kernel_pages = ALIGN_UP(KERNEL_SIZE, PAGE_SIZE) >> PAGE_WIDTH;
  122.     unsigned int init_pages = ALIGN_UP(INIT_SIZE, PAGE_SIZE) >> PAGE_WIDTH;
  123.    
  124.     unsigned int i;
  125.    
  126.     for (i = 0; i < kernel_pages; i++) {
  127.         void *pa = ofw_translate(KERNEL_START + (i << PAGE_WIDTH));
  128.         fix_overlap(KERNEL_START + (i << PAGE_WIDTH), &pa, "Kernel image", &top);
  129.         trans[i] = pa;
  130.     }
  131.    
  132.     for (i = 0; i < init_pages; i++) {
  133.         void *pa = ofw_translate(INIT_START + (i << PAGE_WIDTH));
  134.         fix_overlap(INIT_START + (i << PAGE_WIDTH), &pa, "Init image", &top);
  135.         trans[kernel_pages + i] = pa;
  136.         if (i == 0) {
  137.             bootinfo.init.addr = (void *) ((kernel_pages + i) << PAGE_WIDTH);
  138.             bootinfo.init.size = INIT_SIZE;
  139.         }
  140.     }
  141.    
  142.     fix_overlap(&real_mode, &real_mode_pa, "Bootstrap trampoline", &top);
  143.     fix_overlap(&trans, &trans_pa, "Translation table", &top);
  144.     fix_overlap(&bootinfo, &bootinfo_pa, "Boot info", &top);
  145.    
  146.     printf("\nBooting the kernel...\n");
  147.     jump_to_kernel(bootinfo_pa, sizeof(bootinfo), trans_pa, (kernel_pages + init_pages) << PAGE_WIDTH, fb, real_mode_pa);
  148. }
  149.