By K. C. Wang
This course-tested textbook describes the layout and implementation of working platforms, and applies it to the MTX working process, a Unix-like approach designed for Intel x86 established computers. Written in an evolutional variety, theoretical and functional features of working platforms are offered because the layout and implementation of a whole working method is verified. during the textual content, whole resource code and dealing pattern platforms are used to express the recommendations mentioned. The publication includes many new fabrics at the layout and use of parallel algorithms in SMP. whole insurance on booting an working procedure is incorporated, in addition to, extending the method version to enforce threads aid within the MTX kernel, an init application for procedure startup and a sh application for executing person commands.
Intended for technically orientated working structures classes that emphasize either conception and perform, the ebook can be compatible for self-study.
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Extra resources for Design and Implementation of the MTX Operating System
Thus, the CPU can access at most 4 segments or 256 KB of real memory at any time instant. A program may consist of four distinct pieces, denoted by Code, Data, Stack and Extra sections, each up to 64 KB in size. During execution each of the sections is loaded to a memory segment, which is pointed by a corresponding CPU segment register. Within a program, every address is a 16-bit VA, which is an offset in a program’s section, hence an offset in the section’s segment in memory. For each VA, the CPU uses the corresponding segment register to map it to a PA by (20-bit)PA = (SegmentRegister << 4) + (16-bit)VA where the SegmentRegister is determined either by default or by an explicit segment prefix to the instruction.
G. to execute another task. When the I/O operation completes, the device interrupts the CPU, allowing it to decide what to do next. I/O by interrupts is well suited to multitasking. After starting an I/O operation, if the task has to wait for the I/O operation to complete, the CPU can be switched to run another task. In I/O by DMA (Direct Memory Access), the CPU writes the I/O operation information, such as the memory address, data transfer direction, number of bytes to transfer and the intended device, to a DMA controller and starts the DMA controller.
Out is intended for execution on ELKS (Embedded Linux Kernel System) [ELKS] or an ELKS simulator. To adapt BCC to the development of MTX, we must run BCC’s assembler, compiler and linker in separate steps. Currently, MTX does not have a program development facility of its own. Since most readers have access to Linux and are familiar with its working environment, it is better to use Linux as the development platform of MTX. 3 when we discuss booting. 4–13. 14 and 15. 10 Running MTX The system image of MTX is an EXT2 file system containing the following contents.