Sync with sys/boot/i386/btx/btx/Makefile and btx.s revisions 1.7 and
1.12, respectively.
This commit is contained in:
KATO Takenori
parent
e0a653ddba
commit
7639f2ba3d
@ -2,6 +2,10 @@
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M4?= m4
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.if defined(PAGING)
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M4FLAGS+= -DPAGING
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.endif
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ORG= 0x9000
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AFLAGS+= --defsym PC98=1
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@ -18,7 +22,8 @@ btx: btx.o
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.endif
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btx.o: btx.m4 btx.s
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(cd ${.CURDIR}; ${M4} btx.m4 btx.s) | ${AS} ${AFLAGS} -o ${.TARGET}
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(cd ${.CURDIR}; ${M4} ${M4FLAGS} btx.m4 btx.s) | \
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${AS} ${AFLAGS} -o ${.TARGET}
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CLEANFILES+= btx btx.out btx.o
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@ -164,6 +164,7 @@ init.4: movbi1(_ESP0H,TSS_ESP0+1,_di_) # Set ESP0
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movbi1(SEL_SDATA,TSS_SS0,_di_) # Set SS0
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movbi1(_ESP1H,TSS_ESP1+1,_di_) # Set ESP1
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movbi1(_TSSIO,TSS_MAP,_di_) # Set I/O bit map base
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ifdef(`PAGING',`
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#
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# Create page directory.
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#
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@ -196,20 +197,23 @@ init.6: movb $0x7,%al # Set U:W:P flags
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init.7: stosw # Set entry
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addw %dx,%ax # Next address
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loop init.6 # Till done
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')
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#
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# Bring up the system.
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#
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movwir(0x2820,_bx) # Set protected mode
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callwi(setpic) # IRQ offsets
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lidtwm(idtdesc) # Set IDT
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ifdef(`PAGING',`
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xorw %ax,%ax # Set base
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movb $MEM_DIR>>0x8,%ah # of page
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movl %eax,%cr3 # directory
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')
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lgdtwm(gdtdesc) # Set GDT
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movl %cr0,%eax # Switch to
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o16 # protected mode
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orl $0x80000001,%eax # and enable
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movl %eax,%cr0 # paging
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orl $0x01,%eax #
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movl %eax,%cr0 #
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jmpfwi(SEL_SCODE,init.8) # To 32-bit code
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init.8: xorl %ecx,%ecx # Zero
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movb $SEL_SDATA,%cl # To 32-bit
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@ -255,14 +259,18 @@ init.9: pushb $0x0 # general
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#
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exit: cli # Disable interrupts
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movl $MEM_ESP0,%esp # Clear stack
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ifdef(`PAGING',`
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#
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# Turn off paging.
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#
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movl %cr0,%eax # Get CR0
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andl $~0x80000000,%eax # Disable
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movl %eax,%cr0 # paging
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')
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xorl %ecx,%ecx # Zero
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ifdef(`PAGING',`
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movl %ecx,%cr3 # Flush TLB
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')
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#
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# To 16 bits.
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#
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@ -626,10 +634,64 @@ v86popf.1: movl (%ebx),%eax # Load flags
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orl %eax,%edx # flags
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jmp v86mon.5 # Finish up
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#
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# Emulate INT imm8.
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# trap int 15, function 87
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# reads %es:%si from saved registers on stack to find a GDT containing
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# source and destination locations
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# reads count of words from saved %cx
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# returns success by setting %ah to 0
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#
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int15_87: pushl %eax # Save
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pushl %ebx # some information
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pushl %esi # onto the stack.
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pushl %edi
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xorl %eax,%eax # clean EAX
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xorl %ebx,%ebx # clean EBX
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movl 0x4(%ebp),%esi # Get user's ESI
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movl 0x3C(%ebp),%ebx # store ES
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movw %si,%ax # store SI
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shll $0x4,%ebx # Make it a seg.
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addl %eax,%ebx # ebx=(es<<4)+si
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movb 0x14(%ebx),%al # Grab the
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movb 0x17(%ebx),%ah # necessary
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shll $0x10,%eax # information
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movw 0x12(%ebx),%ax # from
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movl %eax,%esi # the
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movb 0x1c(%ebx),%al # GDT in order to
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movb 0x1f(%ebx),%ah # have %esi offset
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shll $0x10,%eax # of source and %edi
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movw 0x1a(%ebx),%ax # of destination.
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movl %eax,%edi
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pushl %ds # Make:
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popl %es # es = ds
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pushl %ecx # stash ECX
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xorl %ecx,%ecx # highw of ECX is clear
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movw 0x18(%ebp),%cx # Get user's ECX
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rep # repeat...
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movsb # perform copy.
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popl %ecx # Restore
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popl %edi
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popl %esi # previous
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popl %ebx # register
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popl %eax # values.
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movb $0x0,0x1d(%ebp) # set ah = 0 to indicate
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# success
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andb $0xfe,%dl # clear CF
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jmp v86mon.5 # Finish up
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#
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# Emulate INT imm8... also make sure to check if it's int 15/87
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#
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v86intn: lodsb # Get int no
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subl %edi,%esi # From
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cmpb $0x15,%al # is it int 15?
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jne v86intn.2 # no, skip parse
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pushl %eax # stash EAX
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movl 0x1c(%ebp),%eax # user's saved EAX
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cmpb $0x87,%ah # is it our sub function?
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jne v86intn.1 # no, don't handle it
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popl %eax # get the stack straight
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jmp int15_87 # it's our cue
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v86intn.1: popl %eax # restore EAX
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v86intn.2: subl %edi,%esi # From
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shrl $0x4,%edi # linear
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movw %dx,-0x2(%ebx) # Save flags
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movw %di,-0x4(%ebx) # Save CS
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@ -164,6 +164,7 @@ init.4: movbi1(_ESP0H,TSS_ESP0+1,_di_) # Set ESP0
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movbi1(SEL_SDATA,TSS_SS0,_di_) # Set SS0
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movbi1(_ESP1H,TSS_ESP1+1,_di_) # Set ESP1
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movbi1(_TSSIO,TSS_MAP,_di_) # Set I/O bit map base
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ifdef(`PAGING',`
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#
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# Create page directory.
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#
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@ -196,20 +197,23 @@ init.6: movb $0x7,%al # Set U:W:P flags
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init.7: stosw # Set entry
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addw %dx,%ax # Next address
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loop init.6 # Till done
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')
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#
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# Bring up the system.
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#
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movwir(0x2820,_bx) # Set protected mode
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callwi(setpic) # IRQ offsets
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lidtwm(idtdesc) # Set IDT
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ifdef(`PAGING',`
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xorw %ax,%ax # Set base
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movb $MEM_DIR>>0x8,%ah # of page
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movl %eax,%cr3 # directory
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')
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lgdtwm(gdtdesc) # Set GDT
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movl %cr0,%eax # Switch to
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o16 # protected mode
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orl $0x80000001,%eax # and enable
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movl %eax,%cr0 # paging
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orl $0x01,%eax #
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movl %eax,%cr0 #
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jmpfwi(SEL_SCODE,init.8) # To 32-bit code
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init.8: xorl %ecx,%ecx # Zero
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movb $SEL_SDATA,%cl # To 32-bit
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@ -255,14 +259,18 @@ init.9: pushb $0x0 # general
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#
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exit: cli # Disable interrupts
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movl $MEM_ESP0,%esp # Clear stack
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ifdef(`PAGING',`
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#
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# Turn off paging.
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#
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movl %cr0,%eax # Get CR0
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andl $~0x80000000,%eax # Disable
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movl %eax,%cr0 # paging
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')
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xorl %ecx,%ecx # Zero
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ifdef(`PAGING',`
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movl %ecx,%cr3 # Flush TLB
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')
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#
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# To 16 bits.
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#
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@ -626,10 +634,64 @@ v86popf.1: movl (%ebx),%eax # Load flags
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orl %eax,%edx # flags
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jmp v86mon.5 # Finish up
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#
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# Emulate INT imm8.
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# trap int 15, function 87
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# reads %es:%si from saved registers on stack to find a GDT containing
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# source and destination locations
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# reads count of words from saved %cx
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# returns success by setting %ah to 0
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#
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int15_87: pushl %eax # Save
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pushl %ebx # some information
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pushl %esi # onto the stack.
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pushl %edi
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xorl %eax,%eax # clean EAX
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xorl %ebx,%ebx # clean EBX
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movl 0x4(%ebp),%esi # Get user's ESI
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movl 0x3C(%ebp),%ebx # store ES
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movw %si,%ax # store SI
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shll $0x4,%ebx # Make it a seg.
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addl %eax,%ebx # ebx=(es<<4)+si
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movb 0x14(%ebx),%al # Grab the
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movb 0x17(%ebx),%ah # necessary
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shll $0x10,%eax # information
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movw 0x12(%ebx),%ax # from
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movl %eax,%esi # the
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movb 0x1c(%ebx),%al # GDT in order to
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movb 0x1f(%ebx),%ah # have %esi offset
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shll $0x10,%eax # of source and %edi
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movw 0x1a(%ebx),%ax # of destination.
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movl %eax,%edi
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pushl %ds # Make:
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popl %es # es = ds
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pushl %ecx # stash ECX
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xorl %ecx,%ecx # highw of ECX is clear
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movw 0x18(%ebp),%cx # Get user's ECX
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rep # repeat...
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movsb # perform copy.
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popl %ecx # Restore
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popl %edi
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popl %esi # previous
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popl %ebx # register
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popl %eax # values.
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movb $0x0,0x1d(%ebp) # set ah = 0 to indicate
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# success
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andb $0xfe,%dl # clear CF
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jmp v86mon.5 # Finish up
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#
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# Emulate INT imm8... also make sure to check if it's int 15/87
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#
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v86intn: lodsb # Get int no
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subl %edi,%esi # From
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cmpb $0x15,%al # is it int 15?
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jne v86intn.2 # no, skip parse
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pushl %eax # stash EAX
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movl 0x1c(%ebp),%eax # user's saved EAX
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cmpb $0x87,%ah # is it our sub function?
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jne v86intn.1 # no, don't handle it
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popl %eax # get the stack straight
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jmp int15_87 # it's our cue
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v86intn.1: popl %eax # restore EAX
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v86intn.2: subl %edi,%esi # From
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shrl $0x4,%edi # linear
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movw %dx,-0x2(%ebx) # Save flags
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movw %di,-0x4(%ebx) # Save CS
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