Oops. Remove some debugging code used to display a hexdump of the sector
we just loaded from the disk. The code to call it was commented out, and it easily fit into the extra sector, but remove it anyway as it is unneeded.
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@ -301,12 +301,6 @@ main.15: movw $LOAD,%bx # Address for read
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jne main.10 # No
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callw putn # Leave some space
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jmp *%bx # Invoke bootstrap
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/*
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movw %bx,%si # Memory to dump
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movw $SECTOR_SIZE/16,%dx # Lines to display
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callw memdump # Dump memory
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hang: jmp hang # Spin
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*/
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#
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# Display routines
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@ -485,66 +479,9 @@ os_netbsd: .ascii "NetBS"; .byte 'D'|0x80
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os_bsdos: .ascii "BSD/O"; .byte 'S'|0x80
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#
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# A set of functions to print out various parts of %ax in hex
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# Fake partition entry created at the end of the table used when loading
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# boot0 at the very beginning and when loading an MBR from another disk when
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# F5 is pressed.
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#
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hex16: callw hex16.1 # Do upper 8
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hex16.1: xchgb %ah,%al # Save/restore
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hex8: push %ax # Save
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shrb $0x4,%al # Do upper
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callw hex8.1 # 4
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pop %ax # Restore
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hex8.1: andb $0xf,%al # Get lower 4
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cmpb $0xa,%al # Convert
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sbbb $0x69,%al # to hex
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das # digit
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orb $0x20,%al # To lower case
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push %ax # Save
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callw putchr # Print char
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pop %ax # Restore
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retw # (Recursive)
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#
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# Function to display a hexdump of memory. Call with:
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#
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# %dx - word - number of lines to display, each line is 16 bytes
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# %ds:(%si) - caddr_t - memory to display
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#
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memdump: movw %si,%ax # Display the
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callw hex16 # memory offset
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movb $':',%al # Output a seperator
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callw putchr # between the
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movb $' ',%al # offset and
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callw putchr # the data
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push %si # Save %si
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movw $16,%cx # Bytes per line
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memdump.1: lodsb # Get next byte
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callw hex8 # and display it
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movb $' ',%al # Determine which
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cmpb $9,%cl # seperator
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jne memdump.2 # to use
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movb $'-',%al # and then
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memdump.2: callw putchr # display it
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loop memdump.1 # Next byte
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movb $'|',%al # Start of character
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callw putchr # display
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pop %si # Restore %si
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movb $16,%cl # Bytes per line
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memdump.3: lodsb # Get next byte
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cmpb $32,%al # Control character?
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jb memdump.4 # Yes, so modify
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cmpb $0x80,%al # Upper ASCII?
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jb memdump.5 # No, use raw characer
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memdump.4: movb $'.',%al # Use '.' instead of bad char
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memdump.5: callw putchr # Output character
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loop memdump.3 # Do whole line
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movb $'|',%al # Start of character
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callw putchr # display
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push %si # Save %si
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callw putn # New line
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pop %si # Restore %si
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dec %dx # Done yet?
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jnz memdump # No, keep going
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retw # Yes, return
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.org SECTOR_SIZE*NUM_SECTORS, 0x0
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fake:
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