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Rework the detecting of the rdmsr and wrmsr instructions in the v86

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monitor so that the codepath is cleaner and easier to maintain in the
future.
This commit is contained in:
John Baldwin 2000-06-29 01:25:31 +00:00
parent 6843189ab9
commit 52f5035190
2 changed files with 14 additions and 14 deletions
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14
sys/boot/i386/btx/btx/btx.S
View file

@ -478,16 +478,16 @@ v86mon.2: cmpb $0xf4,%al # HLT?
cmpl $inthlt+0x1,%esi # Is inthlt?
jne v86mon.7 # No (ignore)
jmp intrtn # Return to user mode
v86mon.3: cmpb $0xf,%al # Is
jne v86mon.3.1 # this
cmpb $0x20,(%esi) # a
jne v86mon.3.1 # MOV EAX,CR0
cmpb $0xc0,0x1(%esi) # instruction?
je v86mov # Yes
v86mon.3.1: cmpb $0x30,(%esi) # Is it a WRMSR?
v86mon.3: cmpb $0xf,%al # Prefixed instruction?
jne v86mon.4 # No
cmpb $0x30,(%esi) # Is it a WRMSR?
je v86wrmsr # Yes
cmpb $0x32,(%esi) # Is it a RDMSR?
je v86rdmsr # Yes
cmpb $0x20,(%esi) # Is this a
jne v86mon.4 # MOV EAX,CR0
cmpb $0xc0,0x1(%esi) # instruction?
je v86mov # Yes
v86mon.4: cmpb $0xfa,%al # CLI?
je v86cli # Yes
cmpb $0xfb,%al # STI?

14
sys/boot/i386/btx/btx/btx.s
View file

@ -478,16 +478,16 @@ v86mon.2: cmpb $0xf4,%al # HLT?
cmpl $inthlt+0x1,%esi # Is inthlt?
jne v86mon.7 # No (ignore)
jmp intrtn # Return to user mode
v86mon.3: cmpb $0xf,%al # Is
jne v86mon.3.1 # this
cmpb $0x20,(%esi) # a
jne v86mon.3.1 # MOV EAX,CR0
cmpb $0xc0,0x1(%esi) # instruction?
je v86mov # Yes
v86mon.3.1: cmpb $0x30,(%esi) # Is it a WRMSR?
v86mon.3: cmpb $0xf,%al # Prefixed instruction?
jne v86mon.4 # No
cmpb $0x30,(%esi) # Is it a WRMSR?
je v86wrmsr # Yes
cmpb $0x32,(%esi) # Is it a RDMSR?
je v86rdmsr # Yes
cmpb $0x20,(%esi) # Is this a
jne v86mon.4 # MOV EAX,CR0
cmpb $0xc0,0x1(%esi) # instruction?
je v86mov # Yes
v86mon.4: cmpb $0xfa,%al # CLI?
je v86cli # Yes
cmpb $0xfb,%al # STI?