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Diffstat (limited to 'cpu/access_control/addressing.txt')
| -rw-r--r-- | cpu/access_control/addressing.txt | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/cpu/access_control/addressing.txt b/cpu/access_control/addressing.txt new file mode 100644 index 0000000..babe667 --- /dev/null +++ b/cpu/access_control/addressing.txt @@ -0,0 +1,8 @@ +Case 1: Full-width address given: + Upper half is used as an index into the gdt, lower half is used as an offset within the segment + +Case 2: Less than full width address given, segment selector specified: + Fills missing bits of a full-width address with the high bits of the specified segment selector, then processes as in case 1 + +Case 3: Less than full width address given, no segment selector specified: + Same as case 2, but uses upper half of IP for instructions implicitly modifying IP, and SS0 otherwise, as the segment selector |