Time Services

 

Function Number	Function
0x10	Get current time of day
0x11	Get current date
0x40	End tasks time slice
0x41	Pause task
0x60	Get task priority
0x61	Set current task priority
0x98	Suspend task
0x99	Stop task until message received
0x9C	Un-suspend task
0x9D	Re-start task (message received)
0xC0	Install code
0xD0	Create system task
0xD1	Create system idle task
0xD8	Kill task
0xDF	Jump to task
0xF0	Self test
0xFE	Shutdown module

 

This gets the time from the CMOS.

Input
  none

Output
  BL    Second (BCD)
  BH    Minute (BCD)
  CL    Hour (BCD)
  AL    Status

 
0x11    Get current date

This gets the date from the CMOS.

Input
  none

Output
  BX    Year (BCD)
  BH    Month (BCD)
  CL    Day (BCD)
  AL    Status
 

0x40    End tasks time slice

This ends a tasks time slice. Use it when your code has to wait for anything.

Input
  none

Output
  AL    Status
 

0x41    Pause task

This suspends a task for at least the amount of time specified. Be carefull asking for large amounts of time asleep if the task has a message queue.

Input
  EBX    Minimum milli-seconds to sleep for

Output
  AL    Status
 

0x60    Get task priority

Each task has 2 priority values, one set by the user and one set by the task.

Input
  BX    Code ID

Output
  BL    Priority
  AL    Status
 

0x61    Set current tasks priority

Each task has 2 priority values, one set by the user and one set by the task.

Input
  BL    Priority

Output
  AL    Status
 

0x98    Suspend Task

This sets a flag that prevents a task from getting any CPU time. If the current task is suspended this service won't return until this flag has been cleared (using service 0x9C).

Input
  BX    Task ID

Output
  AL    Status

0x99    Stop task until message received

This sets a flag that prevents a task from getting any CPU time. If the current task is suspended this service won't return until this flag has been cleared (using service 0x9D). It should only ever be used by Messaging Services.

Input
  BX    Task ID

Output
  AL    Status
 

0x9C    Un-suspend Task

This clears a flag that prevents a task from getting any CPU time.

Input
  BX    Task ID

Output
  AL    Status
 

0x9D    Start task (message received)

This clears a flag that prevents a task from getting any CPU time. It should only ever be used by Messaging Services.

Input
  BX    Task ID

Output
  AL    Status
 

0xC0    Install Code

This installs and starts any native code.

Input
  EBX    Physical address of code

Output
  BX    Code ID for module
  AL    Status
 

0xD0    Create system task

This creates a task for systems code and drivers. The task created is treated by the scheduler the same as a normal application.

Input
  EBX    Maximum stack size in pages
  CX     Code ID for module
  EDX    New tasks EIP

Output
  EBX    Address of pages allocated for stack
  AL     Status
 

0xD1    Create system idle task

This creates a task for systems code and drivers than only ever runs when there's nothing else to do.

Input
  EBX    Maximum stack size in pages
  CX     Code ID for module
  EDX    New tasks EIP

Output
  EBX    Address of pages allocated for stack
  AL     Status
 

0xD8    Kill task

This removes a tasks TSS and scheduling info (eventually). It doesn't de-allocate any other resources used.

Input
  BX    Task ID

Output
  AL     Status
 

0xDF    Jump to task

Switches from the current task to a new one.

Input
  BX    Task ID

Output
  AL     Status
 

0xF0    Self Test

This service tests the time services data structures.

Input
  none

Output
  EBX    address of error string (unless no error)
  AL     status (0 means ok, no error string)