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# System prepended metadata

title: General Feature

---

# General Feature

* ram size:
    * 128 Mbite

* page table size:
    * 4096

* boot sequence
    * 0x8000_0000
    
### Scheduler
    
### `param.h`
* Fixed Limits
* Several Arrays
    * `kill(pid)`
    
* what is a page
* find argc and argv on the stack

### page table
* Sv32
* Sv39 (xv6)
* Sv48
#### virtual address size:
##### Sv39
* 39 bits
* 2 ^ 39 = 512 Gbites = 0x80_0000_0000

##### xv6 only use 38 bits
* 38 bits
* 2 ^ 38 = 256 Gbites (0x40_0000_0000)
    = `MAXVA`
* address range: 0 ~ 0x3f_ffff_ffff