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C–16 Alpha Architecture Handbook
C.8 DIGITAL UNIX PALcode Instruction Summary
Table C–11: DIGITAL UNIX Unprivileged PALcode Instructions
Mnemonic Opcode Description
bpt 00.0080 Breakpoint trap
bugchk 00.0081 Bugcheck
callsys 00.0083 System call
clrfen 00.00AE Clear floating-point enable
gentrap 00.00AA Generate software trap
imb 00.0086 I-stream memory barrier
rdunique 00.009E Read unique value
urti 00.0092 Return from user mode trap
wrunique 00.009F Write unique value
Table C–12: DIGITAL UNIX Privileged PALcode Instructions
Mnemonic Opcode Description
cflush 00.0001 Cache flush
cserve 00.0009 Console service
draina 00.0002 Drain aborts
halt 00.0000 Halt the processor
rdmces 00.0010 Read machine check error summary register
rdps 00.0036 Read processor status
rdusp 00.003A Read user stack pointer
rdval 00.0032 Read system value
retsys 00.003D Return from system call
rti 00.003F Return from trap or interrupt
swpctx 00.0030 Swap privileged context
swpipl 00.0035 Swap interrupt priority level
swppal 00.000A Swap PALcode image
tbi 00.0033 Translation buffer invalidate
whami 00.003C Who am I
wrent 00.0034 Write system entry address
wrfen 00.002B Write floating-point enable
wripir 00.000D Write interprocessor interrupt request
wrkgp 00.0037 Write kernel global pointer
wrmces 00.0011 Write machine check error summary register
wrperfmon 00.0039 Performance monitoring function
wrusp 00.0038 Write user stack pointer
wrval 00.0031 Write system value
wrvptptr 00.002D Write virtual page table pointer
wtint 00.003E Wait for interrupt