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Sync with sys/boot/i386/btx/btx/btx.s revision 1.10.

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This commit is contained in:
KATO Takenori 1999-03-01 10:02:45 +00:00
parent bb4b3fa51e
commit 729b255473
2 changed files with 52 additions and 24 deletions
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38
sys/boot/pc98/btx/btx/btx.S
View File

@ -13,7 +13,7 @@
# purpose.
#
# $Id: btx.s,v 1.9 1999/01/22 13:07:17 rnordier Exp $
# $Id: btx.s,v 1.1 1999/02/03 08:39:08 kato Exp $
#
# Memory layout.
@ -109,7 +109,7 @@ btx_hdr: .byte 0xeb # Machine ID
.byte 0xe # Header size
.ascii "BTX" # Magic
.byte 0x1 # Major version
.byte 0x0 # Minor version
.byte 0x1 # Minor version
.byte 0x0 # Flags
.word PAG_CNT-MEM_ORG>>0xc # Paging control
.word break-start # Text size
@ -540,9 +540,15 @@ v86mon.1: lodsb # Get opcode
v86mon.2: cmpb $0xf4,%al # HLT?
jne v86mon.3 # No
cmpl $inthlt+0x1,%esi # Is inthlt?
jne v86mon.6 # No (ignore)
jne v86mon.7 # No (ignore)
jmp intrtn # Return to user mode
v86mon.3: cmpb $0xfa,%al # CLI?
v86mon.3: cmpb $0xf,%al # Is
jne v86mon.4 # this
cmpb $0x20,(%esi) # 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?
je v86sti # Yes
@ -562,25 +568,33 @@ v86mon.3: cmpb $0xfa,%al # CLI?
popl %ebx # Restore
popa # Restore
jmp except # Handle exception
v86mon.4: movl %edx,0x30(%ebp) # Save V86 flags
v86mon.5: popl %edx # V86 SS adjustment
v86mon.5: movl %edx,0x30(%ebp) # Save V86 flags
v86mon.6: popl %edx # V86 SS adjustment
subl %edx,%ebx # Save V86
movl %ebx,0x34(%ebp) # SP
v86mon.6: subl %edi,%esi # From linear
v86mon.7: subl %edi,%esi # From linear
movl %esi,0x28(%ebp) # Save V86 IP
popa # Restore
leal 0x8(%esp,1),%esp # Discard int no, error
iret # To V86 mode
#
# Emulate MOV EAX,CR0.
#
v86mov: movl %cr0,%eax # CR0 to
movl %eax,0x1c(%ebp) # saved EAX
incl %esi # Adjust
incl %esi # IP
jmp v86mon.7 # Finish up
#
# Emulate CLI.
#
v86cli: andb $~0x2,0x31(%ebp) # Clear IF
jmp v86mon.6 # Finish up
jmp v86mon.7 # Finish up
#
# Emulate STI.
#
v86sti: orb $0x2,0x31(%ebp) # Set IF
jmp v86mon.6 # Finish up
jmp v86mon.7 # Finish up
#
# Emulate PUSHF/PUSHFD.
#
@ -589,7 +603,7 @@ v86pushf: subl %ecx,%ebx # Adjust SP
je v86pushf.1 # Yes
o16 # 16-bit
v86pushf.1: movl %edx,(%ebx) # Save flags
jmp v86mon.5 # Finish up
jmp v86mon.6 # Finish up
#
# Emulate IRET/IRETD.
#
@ -610,7 +624,7 @@ v86popf.1: movl (%ebx),%eax # Load flags
andl $V86_FLG,%eax # Merge
andl $~V86_FLG,%edx # the
orl %eax,%edx # flags
jmp v86mon.4 # Finish up
jmp v86mon.5 # Finish up
#
# Emulate INT imm8.
#
@ -627,7 +641,7 @@ 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.4 # Finish up
jmp v86mon.5 # Finish up
#
# Hardware interrupt jump table.
#

38
sys/boot/pc98/btx/btx/btx.s
View File

@ -13,7 +13,7 @@
# purpose.
#
# $Id: btx.s,v 1.9 1999/01/22 13:07:17 rnordier Exp $
# $Id: btx.s,v 1.1 1999/02/03 08:39:08 kato Exp $
#
# Memory layout.
@ -109,7 +109,7 @@ btx_hdr: .byte 0xeb # Machine ID
.byte 0xe # Header size
.ascii "BTX" # Magic
.byte 0x1 # Major version
.byte 0x0 # Minor version
.byte 0x1 # Minor version
.byte 0x0 # Flags
.word PAG_CNT-MEM_ORG>>0xc # Paging control
.word break-start # Text size
@ -540,9 +540,15 @@ v86mon.1: lodsb # Get opcode
v86mon.2: cmpb $0xf4,%al # HLT?
jne v86mon.3 # No
cmpl $inthlt+0x1,%esi # Is inthlt?
jne v86mon.6 # No (ignore)
jne v86mon.7 # No (ignore)
jmp intrtn # Return to user mode
v86mon.3: cmpb $0xfa,%al # CLI?
v86mon.3: cmpb $0xf,%al # Is
jne v86mon.4 # this
cmpb $0x20,(%esi) # 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?
je v86sti # Yes
@ -562,25 +568,33 @@ v86mon.3: cmpb $0xfa,%al # CLI?
popl %ebx # Restore
popa # Restore
jmp except # Handle exception
v86mon.4: movl %edx,0x30(%ebp) # Save V86 flags
v86mon.5: popl %edx # V86 SS adjustment
v86mon.5: movl %edx,0x30(%ebp) # Save V86 flags
v86mon.6: popl %edx # V86 SS adjustment
subl %edx,%ebx # Save V86
movl %ebx,0x34(%ebp) # SP
v86mon.6: subl %edi,%esi # From linear
v86mon.7: subl %edi,%esi # From linear
movl %esi,0x28(%ebp) # Save V86 IP
popa # Restore
leal 0x8(%esp,1),%esp # Discard int no, error
iret # To V86 mode
#
# Emulate MOV EAX,CR0.
#
v86mov: movl %cr0,%eax # CR0 to
movl %eax,0x1c(%ebp) # saved EAX
incl %esi # Adjust
incl %esi # IP
jmp v86mon.7 # Finish up
#
# Emulate CLI.
#
v86cli: andb $~0x2,0x31(%ebp) # Clear IF
jmp v86mon.6 # Finish up
jmp v86mon.7 # Finish up
#
# Emulate STI.
#
v86sti: orb $0x2,0x31(%ebp) # Set IF
jmp v86mon.6 # Finish up
jmp v86mon.7 # Finish up
#
# Emulate PUSHF/PUSHFD.
#
@ -589,7 +603,7 @@ v86pushf: subl %ecx,%ebx # Adjust SP
je v86pushf.1 # Yes
o16 # 16-bit
v86pushf.1: movl %edx,(%ebx) # Save flags
jmp v86mon.5 # Finish up
jmp v86mon.6 # Finish up
#
# Emulate IRET/IRETD.
#
@ -610,7 +624,7 @@ v86popf.1: movl (%ebx),%eax # Load flags
andl $V86_FLG,%eax # Merge
andl $~V86_FLG,%edx # the
orl %eax,%edx # flags
jmp v86mon.4 # Finish up
jmp v86mon.5 # Finish up
#
# Emulate INT imm8.
#
@ -627,7 +641,7 @@ 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.4 # Finish up
jmp v86mon.5 # Finish up
#
# Hardware interrupt jump table.
#