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https://git.hardenedbsd.org/hardenedbsd/HardenedBSD.git
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aThis patch updates the BTX to emulate the BIOS function "Copy Extended
Memory" called as function 0x87 of interrupt 0x15. Since the Mylex RAID adapter's BIOS used this function to access memory (actually PCI bus space) beyond 16 MB, this patch also allows BTX to address all 4 Gig of possible address space on i386+. Since the loader does not have room for 4 MB of page tables, this was done by turning off paging. Paging was turned off via a compile time setting which defaults to off. To enable paging, simply define the make variable PAGING. rnordier might want to clean this up later. Submitted by: W. Gerald Hicks <wghicks@bellsouth.net>, Bosko Milekic <bmilekic@ares.dsuper.net> Reviewed by: msmith Required by: Mylex RAID adapter's BIOS
This commit is contained in:
John Baldwin
parent
831ac5c655
commit
228ace6ebf
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=52173
@ -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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all: btx
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@ -16,7 +20,8 @@ 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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@ -155,6 +155,7 @@ 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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@ -187,20 +188,23 @@ 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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@ -240,14 +244,18 @@ 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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@ -545,10 +553,64 @@ 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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@ -155,6 +155,7 @@ 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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@ -187,20 +188,23 @@ 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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@ -240,14 +244,18 @@ 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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@ -545,10 +553,64 @@ 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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