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oldlinux-files/docs/interrupts/int-html/rb-1612.htm
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<TITLE>Int 15/AH=C8h
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Int 15/AH=C8h - SYSTEM - ENABLE/DISABLE PROCESSOR FUNCTIONS -
AH = C8h
AL = function
00h disable L1 cache
01h enable L1 cache
---models 90 and 95 only---
02h disable L2 cache
03h enable L2 cache
04h disable both caches
05h enable both caches
06h return status of both caches
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<h2>Int 15/AH=C8h
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<h3><font color=#C00040>SYSTEM - ENABLE/DISABLE PROCESSOR FUNCTIONS</font></h3>
<PRE>
AH = C8h
AL = function
00h disable L1 cache
01h enable L1 cache
---models 90 and 95 only---
02h disable L2 cache
03h enable L2 cache
04h disable both caches
05h enable both caches
06h return status of both caches
07h-FFh Reserved<br>
<p><b>Return:</b><br>CF set on error
CF clear if successful
AH = status <a href="rb-1612.htm#Table527" tppabs="http://www.ctyme.com/intr/rb-1612.htm#Table527">(see #00527)</a>
For subfunction 06h only:
BL = status of L1 cache
00h enabled
01h disabled or not installed
02h disabled due to test error (can not be enabled)
BH = status of L2 cache (same codes as BL)
</PRE>
<p><b>Notes:</b>
Supported by at least PS/2 70, 70/486, 80-A21, 90, 95.
Call AH=C0h and examine bit 3 of feature byte 2 to check if this
function is supported..
On a 486 system, any external caches must be disabled when the
on-chip cache (L1) is disabled.
<p><b>See Also:</b>
<a href="rb-1594.htm" tppabs="http://www.ctyme.com/intr/rb-1594.htm">AH=C0h</a>
<PRE>
<p>
<a name=table527></a>
(Table 00527)
Values for status:
00h operation successful
01h function choice (in AL) is invalid
02h NVRAM data is invalid
03h cache test error
04h (90 and 95 only) cannot perform operation requested due to state of
other cache (also see note above)
05h no L2 cache is present
07h invalid input values
09h CPU in protected mode
</PRE>
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