diff options
| author | John Baldwin <jhb@FreeBSD.org> | 2000-02-17 20:11:38 +0000 |
|---|---|---|
| committer | John Baldwin <jhb@FreeBSD.org> | 2000-02-17 20:11:38 +0000 |
| commit | 3a2c1f8f80581a0628117ba560aec14aa38b1baa (patch) | |
| tree | 1308b5c1cdef6681b975a19952eb994ff0b01707 /sys/boot | |
| parent | 547748f888027141657b2cd5d8133ceadcd53411 (diff) | |
MFC the int15_87 and Ctrl-Alt-Del fixes.
Approved by: msmith
Notes
svn path=/stable/3/; revision=57295
Diffstat (limited to 'sys/boot')
| -rw-r--r-- | sys/boot/i386/btx/btx/btx.s | 35 |
1 files changed, 29 insertions, 6 deletions
diff --git a/sys/boot/i386/btx/btx/btx.s b/sys/boot/i386/btx/btx/btx.s index c315b5675523..e6f7dc78d7e3 100644 --- a/sys/boot/i386/btx/btx/btx.s +++ b/sys/boot/i386/btx/btx/btx.s @@ -78,8 +78,10 @@ # BIOS Data Area locations. # .set BDA_MEM,0x413 # Free memory + .set BDA_KEYFLAGS,0x417 # Keyboard shift-state flags .set BDA_SCR,0x449 # Video mode .set BDA_POS,0x450 # Cursor position + .set BDA_BOOT,0x472 # Boot howto flag # # Derivations, for brevity. # @@ -290,7 +292,10 @@ exit.2: xorl %eax,%eax # Real mode segment sti # Enable interrupts tstbim(0x1,btx_hdr+0x7) # Reboot? exit.3: jz exit.3 # No - int $0x19 # BIOS: Reboot + .code16 + movw $0x1234, BDA_BOOT # Do a warm boot + jmpfwi(0xffff,0x0) # reboot the machine + .code32 # # Set IRQ offsets by reprogramming 8259A PICs. # @@ -590,6 +595,8 @@ int15_87: pushl %eax # Save pushl %ecx # stash ECX xorl %ecx,%ecx # highw of ECX is clear movw 0x18(%ebp),%cx # Get user's ECX + shll $0x1,%ecx # Convert from num words to num + # bytes rep # repeat... movsb # perform copy. popl %ecx # Restore @@ -603,19 +610,35 @@ int15_87: pushl %eax # Save jmp v86mon.5 # Finish up # +# Reboot the machine by setting the reboot flag and exiting +# +reboot: orb $0x1,btx_hdr+0x7 # Set the reboot flag + jmp exit # Terminate BTX and reboot + +# # Emulate INT imm8... also make sure to check if it's int 15/87 # v86intn: lodsb # Get int no + cmpb $0x19,%al # is it int 19? + je reboot # yes, reboot the machine cmpb $0x15,%al # is it int 15? - jne v86intn.2 # no, skip parse + jne v86intn.3 # no, skip parse pushl %eax # stash EAX movl 0x1c(%ebp),%eax # user's saved EAX - cmpb $0x87,%ah # is it our sub function? - jne v86intn.1 # no, don't handle it + cmpb $0x87,%ah # is it the memcpy subfunction? + jne v86intn.1 # no, keep checking popl %eax # get the stack straight jmp int15_87 # it's our cue -v86intn.1: popl %eax # restore EAX -v86intn.2: subl %edi,%esi # From +v86intn.1: cmpw $0x4f53,%ax # is it the delete key callout? + jne v86intn.2 # no, handle the int normally + movb BDA_KEYFLAGS,%al # get the shift key state + andb $0xc,%al # mask off just Ctrl and Alt + cmpb $0xc,%al # are both Ctrl and Alt down? + jne v86intn.2 # no, handle the int normally + popl %eax # restore EAX + jmp reboot # reboot the machine +v86intn.2: popl %eax # restore EAX +v86intn.3: subl %edi,%esi # From shrl $0x4,%edi # linear movw %dx,-0x2(%ebx) # Save flags movw %di,-0x4(%ebx) # Save CS |