sandpile.org
The world's leading source for technical x86 processor information.


regs

general purpose registers
rFLAGS | masks | bounds
segment registers
table registers
control registers
debug registers
legacy FP | vector FP
model specific registers
 

code

opcode encoding
1 byte opcodes
2 byte opcodes
3 byte opcodes
opcode groups | bits
FP | 3DNow! | SSE5A | XOP
mod R/M byte and SIB byte
16-bit mod R/M byte
 

data

datatypes
stack frame
selectors
descriptors
descriptor tables
task state segment
paging structures
system management mode
 

misc

condition codes
exceptions | interrupts
legacy stuff | APIC | VX
coherency
processor mode
initial state
canonical addresses
CPUID
 

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