The request block is a list of 3 word entries, terminated by a single -1 word.
offset contents
0 page number
4 base address of mapping
8 access to page
Page access
Value Meaning
0 Read/write/execute in user and priviledged modes
1 R/X only in user mode, R/W/X in privileged modes
2 Inaccessible in user mode, R/W/X only in privileged modes,
3 Same as 2, or from RISC OS 3.50+ R/X in user and priviledged modes
10 Not bufferable ?
20 Not cacheable ?
40 Doubly mapped ?
80 No user drag (for dynamic areas)
100 Needs given pages ?
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