Mapa mental

OS

lil cidem Inglês

Conteúdo do mapa

Goals
- Execute user programs, make solving user problems easier
- Make the computer system convenient to use
- Use the computer hardware in an efficient manner
Definition
- Resource allocator
  - Efficient and fair resource use
- Control program
  - Prevent errors and improper use
Computer Startup
- Bootstap program loaded
  - Stored in ROM/EPROM
  - Firmware
  - Initializes all aspects of system
  - Loads OS kernel and starts execution
Common Functions of Interrupts
- Interrupt vector
  - Contains the addresses of all the service routines
- Trap/Exception
  - Software-generated interrupt
Interrupt Handling
- Polling
  - The interrupt controller must poll each device to determine which one made the request
- Vectored
  - Request for attention from an I/O device has been received and also identifies the device