Easyvm analysis is not completed)

E: \ test \ easyvm_small _
Command Parsing, CPU virtual
Virtual device, such as display, DMA, floppy, harddisk, keyboard, PIC, printer, RTC, timer, serial
Program Flow, Architecture

Easy release of easyvm 0.2

Introduction:
================================
Easyvm is a simple virtual machine.
Version 0.1 only supports the 8086 Instruction Set and some simple I/O devices, and only supports English text display.
Version 0.2 is mainly based on version 0.1 with a small part of 32-bit commands (push eax, etc.), so that easyvm can run MS-DOS 6.22 comes with most of the program.

File description:
================================
BiOS \ bios. Bin BIOS Program
BiOS \ biosdata. Bin CMOS Data Zone
Images for DOS. IMG MS-DOS 6.22
Easyvm.exe easyvm main program
Easyvm. ini easyvm configuration file
Readme.txt
TC. IMG floppy disk image containing trubo C 2.0
Dos622c. IMG hard disk image

Easyvm. ini configuration file
[Memory]
; MB
Size = 32

[Img]
A = dos. img
B = tc. img
C =
Cylinders = 20
Heads = 16
SPT = 63

[Boot]
Boot =

Procedure:
Winmain
Vminit
Cpuinit
Set the CPU to run from ecpu. cs = 0xf000; ecpu. IP = 0xfff0;
Initialize intable, and outtable
Malloc memory for memorystart
Read BIOS \ biosdata. bin to memorystart + 0x400, size = 0x100
Set boot drive
* (Char *) (memorystart + 0x0400 + 0x0100) = 0 for
* (Char *) (memorystart + 0x0400 + 0x0100) = 1 for B
Read BIOS \ bios. bin to memorystart + 0xf0000, size =
Dispinit
Picinit ();
Rtcinit ();
Floppyinit ();
Harddiskinit ();
Dmainit ();
Printerinit ();
Serialinit ();
Keyboardinit ();
Systemtimerinit ();
Vmrun
Cpurun: it uses a for continuous execution.
Execins
Obtain the current command OPC in the memory according to the current IP Address: evip
Obtain the address of the function corresponding to the instruction from instable [OPC ].
Execute this function
Refreshvideoram

Vmshutdown
Cputerminate

CPU virtual files are CPU/CPU. cpp, CPU/instructions. cpp
Struct CPU defines all the registers of the CPU
Setupinstructiontable is used to set instable,

Message response, such as keyboard and wm_paint, is defined in the wndproc function (IO \ Display. cpp ).

For the display module, I/O commands are used to replace the entire int 10 h (Out 0b0h, Al. In easyvmbios. ASM instructions). The specific int10h program is implemented in display. cpp,
Function io_write_00b0

Onpaint
Textbufout
Based on different character attributes, the video memory buffer is divided into multiple sub-strings and displayed separately
Draw cursor