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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. typedef struct {
  40.     memmap_t memmap;
  41.     screen_t screen;
  42. } bootinfo_t;
  43.  
  44. bootinfo_t bootinfo;
  45.  
  46.  
  47. static void check_align(const void *addr, const char *desc)
  48. {
  49.     if ((unsigned int) addr % PAGE_SIZE != 0) {
  50.         printf("Error: %s not on page boundary\n", desc);
  51.         halt();
  52.     }
  53. }
  54.  
  55.  
  56. static void fix_overlap(void *va, void **pa, const char *desc, unsigned int *top)
  57. {
  58.     if ((unsigned int) *pa + PAGE_SIZE < *top) {
  59.         printf("Warning: %s overlaps kernel physical area\n", desc);
  60.        
  61.         void *new_va = (void *) (ALIGN_UP((unsigned int) KERNEL_END + HEAP_GAP, PAGE_SIZE) + *top);
  62.         void *new_pa = (void *) (HEAP_GAP + *top);
  63.         *top += PAGE_SIZE;
  64.        
  65.         if (ofw_map(new_pa, new_va, PAGE_SIZE, 0) != 0) {
  66.             printf("Error: Unable to map page aligned memory at %L (physical %L)\n", new_va, new_pa);
  67.             halt();
  68.         }
  69.        
  70.         if ((unsigned int) new_pa + PAGE_SIZE < KERNEL_SIZE) {
  71.             printf("Error: %s cannot be relocated\n", desc);
  72.             halt();
  73.         }
  74.        
  75.         printf("Relocating %L -> %L (physical %L -> %L)\n", va, new_va, *pa, new_pa);
  76.         *pa = new_pa;
  77.         memcpy(new_va, va, PAGE_SIZE);
  78.     }
  79. }
  80.  
  81.  
  82. void bootstrap(void)
  83. {
  84.     printf("\nHelenOS PPC Bootloader\n");
  85.    
  86.     check_align(KERNEL_START, "Kernel 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\n");
  92.         halt();
  93.     }
  94.    
  95.     if (!ofw_screen(&bootinfo.screen)) {
  96.         printf("Error: Unable to get screen properties\n");
  97.         halt();
  98.     }
  99.    
  100.     printf("\nDevice statistics\n");
  101.     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);
  102.    
  103.     void *real_mode_pa = ofw_translate(&real_mode);
  104.     void *trans_pa = ofw_translate(&trans);
  105.     void *bootinfo_pa = ofw_translate(&bootinfo);
  106.    
  107.     printf("\nMemory statistics (total %d MB)\n", bootinfo.memmap.total >> 20);
  108.     printf(" kernel image         at %L (size %d bytes)\n", KERNEL_START, KERNEL_SIZE);
  109.     printf(" boot info            at %L (physical %L)\n", &bootinfo, bootinfo_pa);
  110.     printf(" bootstrap trampoline at %L (physical %L)\n", &real_mode, real_mode_pa);
  111.     printf(" translation table    at %L (physical %L)\n", &trans, trans_pa);
  112.    
  113.     unsigned int top = ALIGN_UP(KERNEL_SIZE, PAGE_SIZE);
  114.     unsigned int addr;
  115.     for (addr = 0; addr < KERNEL_SIZE; addr += PAGE_SIZE) {
  116.         void *pa = ofw_translate(KERNEL_START + addr);
  117.         fix_overlap(KERNEL_START + addr, &pa, "Kernel image", &top);
  118.         trans[addr >> PAGE_WIDTH] = pa;
  119.     }
  120.    
  121.     fix_overlap(&real_mode, &real_mode_pa, "Bootstrap trampoline", &top);
  122.     fix_overlap(&trans, &trans_pa, "Translation table", &top);
  123.     fix_overlap(&bootinfo, &bootinfo_pa, "Boot info", &top);
  124.    
  125.     printf("\nBooting the kernel...\n");
  126.     jump_to_kernel(bootinfo_pa, trans_pa, KERNEL_SIZE, real_mode_pa);
  127. }
  128.