|
| |
Save Mapping Context
|
Input |
Output |
|
AX |
47h |
|
Error
Code |
|
AX |
|
BX |
|
|
|
|
BX |
|
CX |
|
|
|
|
CX |
|
DX |
Callers
EMM Handle (not current) |
|
|
DX |
Save the contents of the expanded memory page-mapping registers
on the expanded memory boards, associating those contents with a
specific EMM handle.
Notes:
* Upward and downward compatible with both EMS and EEMS 3.2.
* This only saves the context saved in EMS 3.2 specification;
if a driver, interrupt routine or TSR needs to do more,
functions 4Eh (Page Map functions) or 4Fh (Partial Page Map
functions) should be used.
* No mention is made about the number of save contexts to
provide. AST recommends in their Rampage AT manual one save
context for each handle plus one per possible interrupt
(5+<handles>).
* This function saves the state of the map registers for only
the 64K page frame defined in versions 3.x of the LIM. Since
all applications written to LIM versions 3.x require saving
the map register state of only this 64K page frame, saving
the entire mapping state for a large number of mappable
pages would be inefficient use of memory. Applications that
use a mappable memory region outside the LIM 3.x page frame
should use functions 15 or 16 to save and restore the state
of the map registers. |