Developing a Multithreaded Kernel From Scratch

Daniel McCarthy

139 Lessons 29h 30m

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7. Understanding Real Mode?

Real mode is a legacy mode in Intel/AMD processors. Learn all about it here

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Course Content

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Introduction

1. Promotional Video 2m 2. Introduction 5m 2. Get the kernel dev books View

Setup And A Brief Explanation Of Kernel Development

3. What Is Memory? 4m 4. The Boot Process 8m 5. Installing What We Need For Real Mode Development 3m

Real Mode Development

6. Hello World Bootloader 16m 6. Hello World Source View 7. Understanding Real Mode? 5m 8. Segmentation Memory Model 9m 9. Improving Our Bootloader 8m 10. Preparing our bootloader to be booted on real hardware 6m 11. Writing our bootloader to a USB stick 3m 12. Booting the bootloader 1m 13. The Interrupt Vector Table Explained 4m 14. Implementing our own interrupts in real mode 7m 15. Disk Access And How It Works 6m 16. Reading from the hard disk 14m

Protected Mode Development

17. What Is Protected Mode? 7m 18. Switching To Protected Mode 16m 19. Restructuring Our Project 3m 20. Enabling the A20 line 3m 21. Creating a Cross Compiler So We Can Code In C 12m 22. Loading our 32 bit kernel into memory and working with debugging symbols 39m 23. Cleaning our object files 2m 24. Dealing With Alignment Issues 8m 25. C Code In Protected Mode 9m 26. Text Mode Explained 3m 27. Writing To The Screen, Hello World Tutorial 17m 28. Interrupt Descriptor Table Explained 9m 29. Implementing The Interrupt Descriptor Table 28m 30. Implementing In And Out Instructions 10m 31. Programmable Interrupt Controller Explained 5m 32. Programmable Interrupt Controller Implementation 13m 33. Understanding The Heap And Memory Allocation 21m 34. Implementing Our Heap 1h 5m 35. Creating The Enable Interrupts Function 3m 36. Understanding Paging 21m 37. Implementing Paging 29m 38. Modifying The Page Table 24m 39. Preparing To Read From The Hard Disk 3m 40. Reading from the disk in C with the ATA controller 11m 41. Improving Our Disk Driver 10m 42. What Is A Filesystem? 8m 43. Creating A Path Parser 37m 44. Creating A Disk Stream 16m 45. File Allocation Table Explained 18m 46. Starting To Create Our FAT filesystem 14m 47. Understanding The VFS(Virtual Filesystem System) Layer 7m 48. Implementing Our Virtual Filesystem Core Functionality 28m 49. Implementing FAT16 filesystem driver core functionality 18m 50. Implementing FAT16 Structures 20m 51. Implementing The FAT16 Resolver Function 34m 52. Implementing the VFS fopen function 25m 53. Implementing FAT16 fopen function 58m 54. Implementing the VFS fread function 7m 55. Implementing FAT16 fread functionality 9m 56. Implementing the VFS fseek functionality 3m 57. Implementing The FAT16 fseek functionality 6m 58. Implementing The VFS fstat functionality 5m 59. Implementing the FAT16 fstat functionality 7m 60. Implementing The VFS fclose functionality 3m 61. Implementing the FAT16 fclose functionality 8m 62. Implementing A Kernel Panic 3m 63. Understanding User Land 15m 64. Changing our kernel segment and data descriptors to be written in C 20m 65. Implementing The TSS(Task Switch Segment) 12m 66. Implementing Task Foundations 30m 67. Implementing Process Foundations Part 1 39m 68. Implementing Process Foundations Part 2 25m 69. Packing the GDT 2m 70. Implementing User Land Functionality 18m 71. Creating Our First User Process Application 10m 72. Executing The Process And Dropping Into User Land Privileges 8m 73. Changing The Paging Functionality 7m 74. Talking With The Kernel From User Land 21m 75. Creating the interrupt 0x80 for user process to kernel communication 25m 76. Creating The Ability To Create And Execute Kernel Commands 12m 77. Creating our first kernel command 11m 78. Calling our kernel command 7m 79. Copying strings from the tasks process 15m 80. Reading the task's stack 22m 81. Creating The Print Command 15m 82. Understanding keyboard access in protected mode 16m 83. Creating the virtual keyboard layer 16m 84. Creating the PS2 port keyboard driver part 1 24m 85. Improving our interrupt descriptor table design 20m 86. Creating a cleaner way to create interrupt handlers in the interrupt descriptor 11m 87. Changing The Current Process 8m 88. Creating the PS2 port keyboard driver part 2 14m 89. Getting a key from the keyboard buffer in user land 11m 90. Creating a putchar command that writes one character to the terminal 7m 91. Implementing backspace in the terminal 4m 92. Revising our stream reader 7m 93. Elf Files Explained 23m 94. Implementing The Elf Loader - Part 1 19m 95. Implementing The Elf Loader - Part 2 24m 96. Implementing The Elf Loader - Part 3 5m 97. Implementing The Elf Loader - Part 4 18m 98. Implementing The Elf Loader - Part 5 29m 99. Implementing The Elf Loader - Part 6 14m 100. Writing User Programs In C 15m 101. Implementing system print in stdlib 7m 102. Implementing system get key in stdlib 3m 103. Implementing Malloc In Our stdlib 22m 104. Implementing Free In Our stdlib 10m 105. Changing the way we map virtual pages for the process 3m 106. Implementing itoa function 5m 107. Implementing the putchar function 8m 108. Implementing the printf function 7m 109. Implementing the ability to read lines 11m 110. Creating a shell 10m 111. Loading other programs from our shell 27m 112. Creating some important stdlib functions 13m 113. Memory Mapping malloc in stdlib 9m 114. Memory Unmapping free In stdlib 12m 115. Process arguments - Part 1 10m 116. Process Arguments - Part 2 29m 117. Process Arguments - Part 3 6m 118. Implementing A 'System' Command 19m 119. Implementing program termination 16m 120. Handling program crashes 9m 121. Creating An Exit Command 6m 122. Handling caps lock, upper case and lower case letters 12m 123. Running multiple tasks at the same time multi-tasking 7m 124. Changing our fat16_new_fat_item_for_directory_item function 2m 125. Changing out fat16_open function 4m 126. Changing our fat16_get_root_directory function 3m 127. Changing our process_load_binary function 3m 128. Improvements to our fat16_to_proper_string function 9m 129. Changing our restore_general_purpose_registers function 4m 130. Kernel Optimizations 1h 20m

Assembly Language Catchup

131. What Is Assembly Language? 2m 132. Installing The Emulator 2m 133. Hello World In Assembly 18m 134. Transistors And Logic Gates Understanding The Processor 13m 135. Registers In Assembly 10m 136. Segmentation In The 8086 9m 137. The Stack, Subroutines And Endiness Explained 9m

Conclusion

138. Kernel Development Book And Compiler Development Course 3m 139. Part Two Course Now Available 1m

Developing a Multithreaded Kernel From Scratch

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7. Understanding Real Mode?

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Daniel McCarthy