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3- 10 M68040 USER'S MANUAL MOTOROLA
ENTRY
SELECT ROOT POINTER
FC2 = 0:URP, 1:SRP
FETCH ROOT
DESCRIPTOR
FETCH POINTER
DESCRIPTOR
FETCH PAGE
DESCRIPTOR
TYPE 'INDIRECT'
FETCH INDIRECT
DESCRIPTOR
EXIT TABLE SEARCH
CREATE ATC ENTRY
WITH R-BIT CLEAR
EXIT TABLE SEARCH
(INITIALIZE ACCRUED
STATUS)
CREATE ATC ENTRY WITH R-BIT SET
ATC ENTRY PFA, DF[U1,U0,S,CM,M],WP
ATC TAG FC2, LA, DF[G]
ABBREVIATIONS:
PFA - PAGE FRAME ADDRESS
DF[ ] - DESCRIPTOR FIELD
WP - ACCUMULATED WRITE-
PROTECTION STATUS
ASSIGNMENT OPERATOR
WP 0
TYPE 'POINTER'
UPDATE FALSE
TYPE 'PAGE'
'RESIDENT'
'INVALID'
'RESIDENT'
'INVALID' 'RESIDENT'
'RESIDENT'
OTHERWISE
'INDIRECT'
PFA = PHYSICAL ADDRESS
FIELD OF DESCRIPTOR
'INVALID'
(CHECK DESCRIPTOR TYPE)
(CHECK DESCRIPTOR TYPE)
(CHECK DESCRIPTOR TYPE)
(CHECK DESCRIPTOR TYPE)
Figure 3-9. Detailed Flowchart of Table Search Operation
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