AMD-K6 Datasheet, PDF (66/346 Pages) Advanced Micro Devices – AMD-K6 Processor

AMD-K6^® Processor Data Sheet
Preliminary Information
20695H/0—March 1998
Reserved
Symbol
P
DPL
DT
Type
Description
Present/Valid Bit
Descriptor Privilege Level
Descriptor Type
See Table 8
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Bits
15
14-13
12
11-8
Offset 31–16
P DPL 0 Type
Segment Selector
Offset 15–0
Figure 42. Gate Descriptor
Exceptions and
Interrupts
Table 9 summarizes the exceptions and interrupts.
Table 9. Summary of Exceptions and Interrupts
Interrupt
Number
Interrupt Type
Cause
0 Divide by Zero Error DIV, IDIV
1 Debug
Debug trap or fault
2 Non-Maskable Interrupt NMI signal sampled asserted
3 Breakpoint
Int 3
4 Overflow
INTO
5 Bounds Check
BOUND
6 Invalid Opcode
Invalid instruction
7 Device Not Available ESC and WAIT
8 Double Fault
Fault occurs while handling a fault
9 Reserved - Interrupt 13 —
10 Invalid TSS
Task switch to an invalid segment
11 Segment Not Present Instruction loads a segment and present bit is 0 (invalid segment)
12 Stack Segment
Stack operation causes limit violation or present bit is 0
13 General Protection
Segment related or miscellaneous invalid actions
14 Page Fault
Page protection violation or a reference to missing page
16 Floating-Point Error Arithmetic error generated by floating-point instruction
17 Alignment Check
Data reference to an unaligned operand. (The AC flag and the AM bit of CR0 are
set to 1.)
0-255 Software Interrupt
INT n
48
Software Environment
Chapter 3