# xnix

**Repository Path**: intirain/xnix

## Basic Information

- **Project Name**: xnix
- **Description**: xnix系统内核
- **Primary Language**: Unknown
- **License**: GPL-3.0
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 4
- **Forks**: 0
- **Created**: 2021-06-09
- **Last Updated**: 2022-01-18

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

## XNIX kernel

### Overview

XNIX is a UNIX-like operating system uses the GPLv3 license. It is a free and open 
source software, you can get its source code from <https://gitee.com/pengruiyang-cpu/xnix>. 


### Change Log 

0.066u-boot:  
&nbsp;&nbsp;&nbsp;&nbsp;upload `boot.asm` -- it puts 'Loading System' on screen, and die. <br/>
&nbsp;&nbsp;&nbsp;&nbsp;see 'How XNIX and other operating systems startup' if you are <br/>
&nbsp;&nbsp;&nbsp;&nbsp;interested in it. 


0.228u-boot:  
&nbsp;&nbsp;&nbsp;&nbsp;update `boot.asm`: it reads the second sector of boot-driver (loader) and jumps to it. <br/>
&nbsp;&nbsp;&nbsp;&nbsp;`loader.asm` puts a message 'Starting Loader' on screen, and die. 

0.431u-boot:  
&nbsp;&nbsp;&nbsp;&nbsp;`loader.asm` switching to long mode. And it set page map to address 0x00000000. It mapped 4MB memories. 

0.427u-init:  
&nbsp;&nbsp;&nbsp;&nbsp;`boot.asm` read 64 sectors to `0x00007e00`, and `loader.asm` jumps to it after switching to long-mode. <br/>
&nbsp;&nbsp;&nbsp;&nbsp;then, `head.S` displays a message on screen. 

0.437u-init:  
&nbsp;&nbsp;&nbsp;&nbsp;`head.S` 'return' to init(void), then `init` put a message on screen and return to `head.S`. <br/>
&nbsp;&nbsp;&nbsp;&nbsp;and then `head.S` check return value of init, if not zero, it will put a message on screen. <br/>
&nbsp;&nbsp;&nbsp;&nbsp;if no error, it will halted the CPU. 

1.611s-modules:  
&nbsp;&nbsp;&nbsp;&nbsp;first stable version! <br/>
&nbsp;&nbsp;&nbsp;&nbsp;copy some files from Cunix, now XNIX can put a formated message on screen. 

1.640u-modules:  
&nbsp;&nbsp;&nbsp;&nbsp;add support for `%b`, `%w`, `%l`, `%q` support for put hex numbers. 

1.706u-int:  
&nbsp;&nbsp;&nbsp;&nbsp;initial IDT in `head.S`, it set all handlers at `defualt_int_handler`

1.854u-int:  
&nbsp;&nbsp;&nbsp;&nbsp;new `int.c` intial `idt_table[0x80]`, and set handler to `syscall`. it put a message and die. 

2.015u-traps:  
&nbsp;&nbsp;&nbsp;&nbsp;add handler for divide-error (always divide by zero). `do_divide_error` write in C, it pucs a message and return. <br/>
&nbsp;&nbsp;&nbsp;&nbsp;`divide_error` is an assembly function. it saves all registers, and call `do_divide_error`. then it recover all registers and iretq. 

2.156u-modules:  
&nbsp;&nbsp;&nbsp;&nbsp;now we can support colouring printf, and I think it's beautifuller than VGA (well...). <br/>
&nbsp;&nbsp;&nbsp;&nbsp;...and, loader loaded kernel to 0x100000 (1MB). 

2.040u-modules:  
&nbsp;&nbsp;&nbsp;&nbsp;now we use graphic.c to display PSF font on VGA 320x200 screen. (but it just can display upper characters, can't display some lower character)

2.035u-init:  
&nbsp;&nbsp;&nbsp;&nbsp;`fd` also need a `inode_descriptor`, but we forgot it. update it again. 

2.154u-boot:  
&nbsp;&nbsp;&nbsp;&nbsp;now this boot routine can run on my computer successfully (16GB u-disk). but it can't run on old-PCs which uses floppy. 

2.164u-int:  
&nbsp;&nbsp;&nbsp;&nbsp;now interrupt handlers and head.S can use print now. 

2.325u-modules:  

&nbsp;&nbsp;&nbsp;&nbsp;now we can use 1024x768 VBE and vsprintf. this is a big change. <br/>
&nbsp;&nbsp;&nbsp;&nbsp;NOTE that interrupts can also work now, but only divide-error and syscall. 

2.327u-int:  
&nbsp;&nbsp;&nbsp;&nbsp;write interrupt handlers again.

3.455u-int:  
&nbsp;&nbsp;&nbsp;&nbsp;now we support all 20 traps and IRQ. 

3.831u-mm:  
&nbsp;&nbsp;&nbsp;&nbsp;we can use `alloc_page` and `free_page` to allocate/free memory. <br/>
&nbsp;&nbsp;&nbsp;&nbsp;and don't forget to call `mm_init` first. 

3.913u-pci:  
&nbsp;&nbsp;&nbsp;&nbsp;I only wrote one function that called `pci_read_config`, and I think PCI is only for this (read device's config). 

4.678u-mm:  
&nbsp;&nbsp;&nbsp;&nbsp;setup TSS and memory pool. now we can use `kmalloc()` and `kfree()` to allocate memory, not `alloc_page()`. 

4.682u-mm:  
&nbsp;&nbsp;&nbsp;&nbsp;`alloc_page` returns a wrong address that isn't that it get from `mapping()`. 

5.011u-sched:  
&nbsp;&nbsp;&nbsp;&nbsp;now `task_init()`, `ktask_create()`, `do_fork()` and `switch_to()` can work: create a new task and switch to it. 

5.039u-sched:  
&nbsp;&nbsp;&nbsp;&nbsp;write `do_fork()` again and do it easier (and also fixed a bug of kmalloc() - didn't be zero before used). default <br/>
&nbsp;&nbsp;&nbsp;&nbsp;stack size is 64KB. 

5.063u-graphic:  
&nbsp;&nbsp;&nbsp;&nbsp;using more colors (very beautiful! ) :-)

7.073u-boot:  
&nbsp;&nbsp;&nbsp;&nbsp;using CFS to be start-up device, not a binary device (without any file systems). <br/>
&nbsp;&nbsp;&nbsp;&nbsp;now cfs can creat/lsdir/mkdir/rw (but only starts at the start of file). <br/>
&nbsp;&nbsp;&nbsp;&nbsp;and boot jumps to 0x7e60 (0x7e00 + sizeof(struct superblock)), not 0x7e00 (the second sector). <br/>

7.110u-boot:  
&nbsp;&nbsp;&nbsp;&nbsp;loader uses assembly code to read the root-directory, and search the file 'ksetup'. <br/>
&nbsp;&nbsp;&nbsp;&nbsp;and we just search in the first block of the root-directory. <br/>

7.301u-boot:  
&nbsp;&nbsp;&nbsp;&nbsp;now loader reads the 'ksetup' to 0x9000 (not 0x8000 in the past), and jump to it. <br/>
&nbsp;&nbsp;&nbsp;&nbsp;it works on my 16G disk (real-machine) and under, but failed on the 1TB disk (real and virtual machine). <br/>
&nbsp;&nbsp;&nbsp;&nbsp;maybe that is too large? <br/>
&nbsp;&nbsp;&nbsp;&nbsp;and, main didn't work on the real-machine. :-(

7.274u-tty:  
&nbsp;&nbsp;&nbsp;&nbsp;now we use the vga-text, not that graphic mode because it's buggy :-(. now we can roll that fing screen (I tried to do this for many times) <br/>
&nbsp;&nbsp;&nbsp;&nbsp;and we can put it in colors. 

7.411u-sched:  
&nbsp;&nbsp;&nbsp;&nbsp;`switch_to` is now working. it can switch in A and B. (but it is not a `schedule()`) :-)

7.660u-keyboard:  
&nbsp;&nbsp;&nbsp;&nbsp;now we use a fifo-buffer, to store key scan codes. (but we don't put it to screen)

7.689u-sched:  
&nbsp;&nbsp;&nbsp;&nbsp;`switch_to` is now working! it can switch in A and B. (but it is not a `schedule()`) :-), and <br/>
&nbsp;&nbsp;&nbsp;&nbsp;registers will not change! and we are using the array, not the list now because this is simpiler. <br/>
&nbsp;&nbsp;&nbsp;&nbsp;the max tasks is default to be 128, but you can make it bigger anyway (because it's a `**` pointer, not a <br/>
&nbsp;&nbsp;&nbsp;&nbsp;`struct task *` pointer. so it saves the address, and `struct task` allocates when `do_fork()`, not the `task_init()` <br/>

7.783u-sched:  
&nbsp;&nbsp;&nbsp;&nbsp;`schedule()` is now working! 

7.937u-keyboard:  
&nbsp;&nbsp;&nbsp;&nbsp;now we can input characters, by `put_keycode()`.

7.968u-pci:  
&nbsp;&nbsp;&nbsp;&nbsp;add the function `pci_lspci()` to scan all devices. 

8.153u-user:  
&nbsp;&nbsp;&nbsp;&nbsp;now we can run in the user-mode. 

8.229u-user:  
&nbsp;&nbsp;&nbsp;&nbsp;add syscall `sys_print` (will remove it later), and now user can call it <br/>
&nbsp;&nbsp;&nbsp;&nbsp;to put a message on the screen. 

8.463u-tty:  
&nbsp;&nbsp;&nbsp;&nbsp;move the `tty.c` from module, to the main kernel because we need it, and <br/>
&nbsp;&nbsp;&nbsp;&nbsp;it's not a device. 

8.990u-mods:  
&nbsp;&nbsp;&nbsp;&nbsp;ahci driver is not working. drunk, do it later. 

9.106s-init:  
&nbsp;&nbsp;&nbsp;&nbsp;get the time from cmos, and make it to unix time-stamp. 
&nbsp;&nbsp;&nbsp;&Nbsp;and this version looks work. 

9.085u-mods:  
&nbsp;&nbsp;&nbsp;&nbsp;ahci driver is not working... drunk, i'll not fix it. 

9.389u-mods:  
&nbsp;&nbsp;&nbsp;&nbsp;ahci driver is not working............

9.808u-mods:  
&nbsp;&nbsp;&nbsp;&nbsp;now ide driver is working, and we fixed a bug about the irq: 
&nbsp;&nbsp;&nbsp;&nbsp;that the slave-irq's EOI not send. 

9.640u-int:  
&nbsp;&nbsp;&nbsp;&nbsp;now we use another mode to `register_irq`: a new api that `set_irq`. 
&nbsp;&nbsp;&nbsp;&nbsp;`set_irq` just need 2 arguments, it's simplier, and faster. 

9.380u-mods:  
&nbsp;&nbsp;&nbsp;&nbsp;move the ahci-driver to the dev branch, because it's unworkable (well...). 

9.742u-mods:  
&nbsp;&nbsp;&nbsp;&nbsp;add support for beep (in pit). 

9.742u-mods:  
&nbsp;&nbsp;&nbsp;&nbsp;add support for beep (in pit). 

9.966u-mods:  
&nbsp;&nbsp;&nbsp;&nbsp;add support for serial port: it creates a new tty 'tty1' (COM0). 

10.024u-mods:  
&nbsp;&nbsp;&nbsp;&nbsp;now `print` can use `com0` and `console` to put, not only one. 

9.590u-init:  
&nbsp;&nbsp;&nbsp;&nbsp;we now removed all schk. 

9.399u-arch:  
&nbsp;&nbsp;&nbsp;&nbsp;there's a big problem: it exists when this project creates :-). the 
&nbsp;&nbsp;&nbsp;&nbsp;the macros in /include/arch/x86/paging.h and /include/boot/paging.asm 
&nbsp;&nbsp;&nbsp;&nbsp;are WRONG. :-(