Motorola CPU32 User Manual Page 492

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Supervisor (Privileged) Instructions
6-38 M68000 FAMILY PROGRAMMER’S REFERENCE MANUAL MOTOROLA
PFLUSH PFLUSH
PFLUSHA PFLUSHA
PFLUSHS Invalidate Entries in the ATC PFLUSHS
(MC68851)
Operation: If Supervisor State
Then Address Translation Cache Entries For Destination Address
Are Invalidated
Else TRAP
Assembler PFLUSHA
Syntax: PFLUSH FC,MASK
PFLUSHS FC,MASK
PFLUSH FC,MASK, < ea >
PFLUSHS FC,MASK, < ea >
Attributes: Unsigned
Description: PFLUSHA invalidates all entries in the address translation cache.
PFLUSH invalidates a set of address translation cache entries whose function code
bits satisfy the relation: (address translation cache function code bits and mask) = (FC
and MASK) for all entries whose task alias matches the task alias currently active when
the instruction is executed. With an additional effective address argument, PFLUSH
invalidates a set of address translation cache entries whose function code satisfies the
relation above and whose effective address field matches the corresponding bits of the
evaluated effective address argument. In both of these cases, address translation
cache entries whose SG bit is set will not be invalidated unless the PFLUSHS is spec-
ified.
The function code for this operation may be specified as follows:
1. Immediate—The function code is four bits in the command word.
2. Data Register—The function code is in the lower four bits of the MC68020 data
register specified in the instruction.
3. Source Function Code (SFC) Register—The function code is in the CPU SFC
register. Since the SFC of the MC68020 has only three implemented bits, only
function codes $0D$7 can be specified in this manner.
4. Destination Function Code (DFC) Register—The function code is in the CPU
DFC register. Since the DFC of the MC68020 has only three implemented bits,
only function codes $0D$7 can be specified in this manner.
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