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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. #include "_components.h"
  33.  
  34. #define HEAP_GAP 1024000
  35.  
  36. bootinfo_t bootinfo;
  37.  
  38.  
  39. static void check_align(const void *addr, const char *desc)
  40. {
  41.     if ((unsigned long) addr % PAGE_SIZE != 0) {
  42.         printf("Error: %s not on page boundary, halting.\n", desc);
  43.         halt();
  44.     }
  45. }
  46.  
  47.  
  48. static void fix_overlap(void *va, void **pa, const char *desc, unsigned long *top)
  49. {
  50.     if ((unsigned long) *pa + PAGE_SIZE < *top) {
  51.         printf("Warning: %s overlaps kernel physical area\n", desc);
  52.        
  53.         void *new_va = (void *) (ALIGN_UP((unsigned long) KERNEL_END + HEAP_GAP, PAGE_SIZE) + *top);
  54.         void *new_pa = (void *) (HEAP_GAP + *top);
  55.         *top += PAGE_SIZE;
  56.        
  57.         if (ofw_map(new_pa, new_va, PAGE_SIZE, 0) != 0) {
  58.             printf("Error: Unable to map page aligned memory at %L (physical %L), halting.\n", new_va, new_pa);
  59.             halt();
  60.         }
  61.        
  62.         if ((unsigned long) new_pa + PAGE_SIZE < KERNEL_SIZE) {
  63.             printf("Error: %s cannot be relocated, halting.\n", desc);
  64.             halt();
  65.         }
  66.        
  67.         printf("Relocating %L -> %L (physical %L -> %L)\n", va, new_va, *pa, new_pa);
  68.         *pa = new_pa;
  69.         memcpy(new_va, va, PAGE_SIZE);
  70.     }
  71. }
  72.  
  73.  
  74. void bootstrap(void)
  75. {
  76.     printf("\nHelenOS PPC Bootloader\n");
  77.    
  78.     init_components();
  79.    
  80.     unsigned int i;
  81.    
  82.     for (i = 0; i < COMPONENTS; i++)
  83.         check_align(components[i].start, components[i].name);
  84.    
  85.     check_align(&real_mode, "bootstrap trampoline");
  86.     check_align(&trans, "translation table");
  87.    
  88.     if (!ofw_memmap(&bootinfo.memmap)) {
  89.         printf("Error: unable to get memory map, halting.\n");
  90.         halt();
  91.     }
  92.    
  93.     if (bootinfo.memmap.total == 0) {
  94.         printf("Error: no memory detected, halting.\n");
  95.         halt();
  96.     }
  97.    
  98.     if (!ofw_screen(&bootinfo.screen)) {
  99.         printf("Error: unable to get screen properties, halting.\n");
  100.         halt();
  101.     }
  102.    
  103.     printf("\nDevice statistics\n");
  104.     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);
  105.    
  106.     void *real_mode_pa = ofw_translate(&real_mode);
  107.     void *trans_pa = ofw_translate(&trans);
  108.     void *bootinfo_pa = ofw_translate(&bootinfo);
  109.    
  110.     printf("\nMemory statistics (total %d MB)\n", bootinfo.memmap.total >> 20);
  111.     printf(" %L: boot info structure (physical %L)\n", &bootinfo, bootinfo_pa);
  112.     printf(" %L: bootstrap trampoline (physical %L)\n", &real_mode, real_mode_pa);
  113.     printf(" %L: translation table (physical %L)\n", &trans, trans_pa);
  114.     for (i = 0; i < COMPONENTS; i++)
  115.         printf(" %L: %s image (size %d bytes)\n", components[i].start, components[i].name, components[i].size);
  116.    
  117.     unsigned long top = 0;
  118.     for (i = 0; i < COMPONENTS; i++)
  119.         top += ALIGN_UP(components[i].size, PAGE_SIZE);
  120.    
  121.     unsigned long pages = ALIGN_UP(KERNEL_SIZE, PAGE_SIZE) >> PAGE_WIDTH;
  122.    
  123.     for (i = 0; i < pages; i++) {
  124.         void *pa = ofw_translate(KERNEL_START + (i << PAGE_WIDTH));
  125.         fix_overlap(KERNEL_START + (i << PAGE_WIDTH), &pa, "kernel", &top);
  126.         trans[i] = pa;
  127.     }
  128.    
  129.     bootinfo.taskmap.count = 0;
  130.     for (i = 1; i < COMPONENTS; i++) {
  131.         unsigned long component_pages = ALIGN_UP(components[i].size, PAGE_SIZE) >> PAGE_WIDTH;
  132.         unsigned long j;
  133.        
  134.         for (j = 0; j < component_pages; j++) {
  135.             void *pa = ofw_translate(components[i].start + (j << PAGE_WIDTH));
  136.             fix_overlap(components[i].start + (j << PAGE_WIDTH), &pa, components[i].name, &top);
  137.             trans[pages + j] = pa;
  138.             if (j == 0) {
  139.                 bootinfo.taskmap.tasks[bootinfo.taskmap.count].addr = (void *) (pages << PAGE_WIDTH);
  140.                 bootinfo.taskmap.tasks[bootinfo.taskmap.count].size = components[i].size;
  141.                 bootinfo.taskmap.count++;
  142.             }
  143.         }
  144.        
  145.         pages += component_pages;
  146.     }
  147.    
  148.     fix_overlap(&real_mode, &real_mode_pa, "bootstrap trampoline", &top);
  149.     fix_overlap(&trans, &trans_pa, "translation table", &top);
  150.     fix_overlap(&bootinfo, &bootinfo_pa, "boot info", &top);
  151.    
  152.     printf("\nBooting the kernel...\n");
  153.     jump_to_kernel(bootinfo_pa, sizeof(bootinfo), trans_pa, pages << PAGE_WIDTH, real_mode_pa);
  154. }
  155.