Contents:
Accessing the kernel
Services for applicationsMemory servicesServices for system code
Scheduler services
Messaging services
System servicesMemory services
Scheduler services
Messaging services
System services
The kernel is accessed via a range of software interrupts. Each interrupt
provides a group of related functions called a service. Services are split
into 2 interfaces, the first for applications and the second for system
code (device drivers, etc).
Interrupt | Use |
Services for applications | |
0x40 | Memory services |
0x41 | Time services |
0x42 | Messaging services |
0x43 | System services |
0x6F | Query services |
Services for system code | |
0x60 | Memory services |
0x61 | Time services |
0x62 | Messaging services |
0x63 | System services |
0x7F | Query services |
Parameters are passed to the kernel in registers, EAX always holds the
function number. AL is used to return an error code (if AL = 0 then no
error). A list of standard error code can be found in the source code here.