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annotate cos/kernel/kernel.c @ 33:d8185ddb6c7b

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Added more interrupt handlers
author windel
date Sun, 15 Jan 2012 13:39:49 +0100
parents 3a6a9b929db0
children 8012221dd740
rev   line source
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1 #include "kernel.h"
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3 static void testMalloc()
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4 {
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5 char *a, *b;
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6
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7 printf("Testing malloc\n");
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8 a = kmalloc(100);
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9 printf("Got a at %x\n", a);
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10 a[0] = 'A';
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11 b = kmalloc(22);
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12 printf("Got b at %x\n", b);
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13 b[0] = 'B';
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14 kfree(a);
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15 }
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16
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17 multiboot_info_t *multiboot_info = 0; // Set by startup code.
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18
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19 /* This routine initializes the kernel.
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20 * We are left here in 64-bit long mode with the first 6 MB identity mapped.
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21 * */
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22 void kmain()
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23 {
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24 init_screen();
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25 setupIDT();
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27 uint64_t available_memory = 0;
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28
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29 printf("Running with %d MB ram\n", available_memory / 1000000);
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30
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31 printf("Detecting amount of memory\n");
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32
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33 printf("Grub multiboot header location: %x\n", multiboot_info);
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34 // On real hardware, the retrieval of the flags fails into general protection fault??
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35
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36 printf("Grub lower mem: %d\n", multiboot_info->mem_lower);
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37 printf("Grub multiboot header flags: %x\n", multiboot_info->flags);
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38
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39 /* Display memory information from multiboot header */
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40 if ((multiboot_info->flags & (1<<6)) == (1<<6))
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41 {
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42 printf("Found GRUB memory map\n");
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43 multiboot_memory_map_t *mmap;
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44 for (mmap = (multiboot_memory_map_t*)(uint64_t)multiboot_info->mmap_addr;
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45 (uint64_t)mmap < multiboot_info->mmap_addr + multiboot_info->mmap_length;
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46 mmap = (multiboot_memory_map_t*) ( (uint64_t)mmap + mmap->size + sizeof(mmap->size)) )
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47 {
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48 printf("size: %d, start: 0x%x, length=0x%x, type=%d\n", mmap->size, mmap->base, mmap->length, mmap->type);
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49
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50 if ( (mmap->type == 1) && (mmap->base == 0x100000) )
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51 {
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52 available_memory = mmap->length;
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53 }
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54 }
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55 }
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56 else
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57 {
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58 printf("Found no GRUB map\n");
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59 }
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60
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61 printf("Running with %d MB ram\n", available_memory / 1000000);
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62
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63 fs_node_t *fs_root = 0;
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64
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65 if ( (multiboot_info->flags & (1<<3)) == (1<<3))
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66 {
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67 printf("Mod count: %d\n", multiboot_info->mods_count);
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68 uint64_t i;
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69 multiboot_module_t *mod;
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70 for (i=0, mod=(multiboot_module_t*)(uint64_t)multiboot_info->mods_addr; i<multiboot_info->mods_count; i++, mod++)
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71 {
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72 printf("Mod start: %x, end: %x\n", mod->mod_start, mod->mod_end);
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73 if (i == 0)
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74 {
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75 uint64_t ramdisk_location = ((uint32_t*)((uint64_t)multiboot_info->mods_addr))[0];
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76 fs_root = initialize_initrd(ramdisk_location);
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77 }
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78 }
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79 }
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80
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81 if (fs_root != 0)
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82 {
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83 fs_dirent_t *node = 0;
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84 int i = 0;
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85 while ( (node = readdir_fs(fs_root, i)) != 0)
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86 {
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87
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88 }
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89 }
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90
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91 // TODO: Make sure that placement malloc does not overwrite the ramdisk.
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92 printf("Mod size: ");
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93
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94 // Assume first 16MB:
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95 // TODO: get size from grub
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96 init_memory(0x1000000);
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97
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98 // TODO: make below a user space program!
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99 printf("Welcome!\n");
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100
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102 while (1==1)
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103 {
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104 char buffer[70];
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105 printf(">");
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106 getline(buffer, 70);
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107 // TODO: interpret this line with python :)
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108 printf("\n");
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109 if (buffer[0] == 'x')
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110 {
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111 printf("System time in ms: %d\n", getTimeMS());
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112 }
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113 if (buffer[0] == 't')
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114 {
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115 testMalloc();
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116 }
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117 if ( strncmp(buffer, "help", 4))
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118 {
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119 printf("Help\n Try one of these commands:\n");
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120 printf(" x: print system time in ms\n");
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121 printf(" r: reboot\n");
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122 printf(" t: test\n");
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123 printf(" b: break\n");
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124 }
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125 if (strncmp(buffer, "r", 1))
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126 {
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127 reboot();
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128 }
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129 if (strncmp(buffer, "b", 1))
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130 {
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131 magicBochsBreak();
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132 }
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133 if (strncmp(buffer, "pf", 2))
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134 {
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135 /* Test general protection exception */
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136 uint64_t *x;
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137 x = (uint64_t*)0x4000000; // Address that is not mapped
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138 *x = 0x2; // trigger paging exception
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139 }
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140
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141 }
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142 }
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