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Ignore, rather than emulate, an i386 'hlt' instruction (though for

Browse source 
most practical purposes, this should be indistinguishable from a
more strictly correct approach).

Feedback and testing: msmith
This commit is contained in:
Robert Nordier 1998-11-01 13:52:52 +00:00
parent de4f843d24
commit 3b1bd5ae35
2 changed files with 22 additions and 22 deletions
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22
sys/boot/i386/btx/btx/btx.S
View file

@ -13,7 +13,7 @@
# purpose.
#
# $Id: btx.s,v 1.5 1998/10/03 18:05:12 rnordier Exp $
# $Id: btx.s,v 1.6 1998/10/04 21:14:33 rnordier Exp $
#
# Memory layout.
@ -459,7 +459,7 @@ v86mon.1: lodsb # Get opcode
v86mon.2: cmpb $0xf4,%al # HLT?
jne v86mon.3 # No
cmpl $inthlt+0x1,%esi # Is inthlt?
jne v86mon.4 # No
jne v86mon.6 # No
jmp intrtn # Return to user mode
v86mon.3: cmpb $0xfa,%al # CLI?
je v86cli # Yes
@ -479,13 +479,13 @@ v86mon.3: cmpb $0xfa,%al # CLI?
cmpb $0xcf,%al # IRET/IRETD?
je v86iret # Yes
popl %ebx # Restore
v86mon.4: popa # Restore
popa # Restore
jmp except # Handle exception
v86mon.5: movl %edx,0x30(%ebp) # Save V86 flags
v86mon.6: popl %edx # V86 SS adjustment
v86mon.4: movl %edx,0x30(%ebp) # Save V86 flags
v86mon.5: popl %edx # V86 SS adjustment
subl %edx,%ebx # Save V86
movl %ebx,0x34(%ebp) # SP
v86mon.7: subl %edi,%esi # From linear
v86mon.6: subl %edi,%esi # From linear
movl %esi,0x28(%ebp) # Save V86 IP
popa # Restore
leal 0x8(%esp,1),%esp # Discard int no, error
@ -494,12 +494,12 @@ v86mon.7: subl %edi,%esi # From linear
# Emulate CLI.
#
v86cli: andb $~0x2,0x31(%ebp) # Clear IF
jmp v86mon.7 # Finish up
jmp v86mon.6 # Finish up
#
# Emulate STI.
#
v86sti: orb $0x2,0x31(%ebp) # Set IF
jmp v86mon.7 # Finish up
jmp v86mon.6 # Finish up
#
# Emulate PUSHF/PUSHFD.
#
@ -508,7 +508,7 @@ v86pushf: subl %ecx,%ebx # Adjust SP
je v86pushf.1 # Yes
o16 # 16-bit
v86pushf.1: movl %edx,(%ebx) # Save flags
jmp v86mon.6 # Finish up
jmp v86mon.5 # Finish up
#
# Emulate IRET/IRETD.
#
@ -529,7 +529,7 @@ v86popf.1: movl (%ebx),%eax # Load flags
andl $V86_FLG,%eax # Merge
andl $~V86_FLG,%edx # the
orl %eax,%edx # flags
jmp v86mon.5 # Finish up
jmp v86mon.4 # Finish up
#
# Emulate INT imm8.
#
@ -546,7 +546,7 @@ v86intn: lodsb # Get int no
movl %edi,0x2c(%ebp) # Save CS
xorl %edi,%edi # No ESI adjustment
andb $~0x3,%dh # Clear IF and TF
jmp v86mon.5 # Finish up
jmp v86mon.4 # Finish up
#
# Hardware interrupt jump table.
#

22
sys/boot/i386/btx/btx/btx.s
View file

@ -13,7 +13,7 @@
# purpose.
#
# $Id: btx.s,v 1.5 1998/10/03 18:05:12 rnordier Exp $
# $Id: btx.s,v 1.6 1998/10/04 21:14:33 rnordier Exp $
#
# Memory layout.
@ -459,7 +459,7 @@ v86mon.1: lodsb # Get opcode
v86mon.2: cmpb $0xf4,%al # HLT?
jne v86mon.3 # No
cmpl $inthlt+0x1,%esi # Is inthlt?
jne v86mon.4 # No
jne v86mon.6 # No
jmp intrtn # Return to user mode
v86mon.3: cmpb $0xfa,%al # CLI?
je v86cli # Yes
@ -479,13 +479,13 @@ v86mon.3: cmpb $0xfa,%al # CLI?
cmpb $0xcf,%al # IRET/IRETD?
je v86iret # Yes
popl %ebx # Restore
v86mon.4: popa # Restore
popa # Restore
jmp except # Handle exception
v86mon.5: movl %edx,0x30(%ebp) # Save V86 flags
v86mon.6: popl %edx # V86 SS adjustment
v86mon.4: movl %edx,0x30(%ebp) # Save V86 flags
v86mon.5: popl %edx # V86 SS adjustment
subl %edx,%ebx # Save V86
movl %ebx,0x34(%ebp) # SP
v86mon.7: subl %edi,%esi # From linear
v86mon.6: subl %edi,%esi # From linear
movl %esi,0x28(%ebp) # Save V86 IP
popa # Restore
leal 0x8(%esp,1),%esp # Discard int no, error
@ -494,12 +494,12 @@ v86mon.7: subl %edi,%esi # From linear
# Emulate CLI.
#
v86cli: andb $~0x2,0x31(%ebp) # Clear IF
jmp v86mon.7 # Finish up
jmp v86mon.6 # Finish up
#
# Emulate STI.
#
v86sti: orb $0x2,0x31(%ebp) # Set IF
jmp v86mon.7 # Finish up
jmp v86mon.6 # Finish up
#
# Emulate PUSHF/PUSHFD.
#
@ -508,7 +508,7 @@ v86pushf: subl %ecx,%ebx # Adjust SP
je v86pushf.1 # Yes
o16 # 16-bit
v86pushf.1: movl %edx,(%ebx) # Save flags
jmp v86mon.6 # Finish up
jmp v86mon.5 # Finish up
#
# Emulate IRET/IRETD.
#
@ -529,7 +529,7 @@ v86popf.1: movl (%ebx),%eax # Load flags
andl $V86_FLG,%eax # Merge
andl $~V86_FLG,%edx # the
orl %eax,%edx # flags
jmp v86mon.5 # Finish up
jmp v86mon.4 # Finish up
#
# Emulate INT imm8.
#
@ -546,7 +546,7 @@ v86intn: lodsb # Get int no
movl %edi,0x2c(%ebp) # Save CS
xorl %edi,%edi # No ESI adjustment
andb $~0x3,%dh # Clear IF and TF
jmp v86mon.5 # Finish up
jmp v86mon.4 # Finish up
#
# Hardware interrupt jump table.
#