;
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;
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; keyboard.s -- a PC keyboard as input device
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; keyboard.s -- a PC keyboard as input device
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;
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;
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;***************************************************************
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;***************************************************************
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.set kbdbase,0xF0200000 ; keyboard base address
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.set kbdbase,0xF0200000 ; keyboard base address
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; .import cout
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; .import cout
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; .import byteout
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; .import byteout
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.import xltbl1 ; kbd translation table 1
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.import xltbl1 ; kbd translation table 1
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.import xltbl2 ; kbd translation table 2
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.import xltbl2 ; kbd translation table 2
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.export kbdinit ; initialize keyboard
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.export kbdinit ; initialize keyboard
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.export kbdinchk ; check if input available
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.export kbdinchk ; check if input available
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.export kbdin ; do keyboard input
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.export kbdin ; do keyboard input
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;***************************************************************
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;***************************************************************
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.code
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.code
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.align 4
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.align 4
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kbdinit:
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kbdinit:
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jr $31
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jr $31
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kbdinchk:
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kbdinchk:
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add $8,$0,kbdbase
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add $8,$0,kbdbase
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ldw $2,$8,0
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ldw $2,$8,0
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and $2,$2,1
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and $2,$2,1
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jr $31
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jr $31
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kbdin:
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kbdin:
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sub $29,$29,12
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sub $29,$29,12
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stw $31,$29,8
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stw $31,$29,8
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stw $16,$29,4
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stw $16,$29,4
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stw $17,$29,0
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stw $17,$29,0
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kbdin0:
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kbdin0:
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jal kbdinp
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jal kbdinp
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add $16,$2,$0 ; key 1 in $16
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add $16,$2,$0 ; key 1 in $16
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add $8,$0,0xF0
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add $8,$0,0xF0
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bne $16,$8,kbdin2
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bne $16,$8,kbdin2
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kbdin1:
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kbdin1:
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jal kbdinp
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jal kbdinp
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j kbdin0
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j kbdin0
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kbdin2:
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kbdin2:
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jal kbdinp
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jal kbdinp
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add $17,$2,$0 ; key 2 in $17
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add $17,$2,$0 ; key 2 in $17
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beq $17,$16,kbdin2
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beq $17,$16,kbdin2
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add $8,$0,0xF0
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add $8,$0,0xF0
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beq $17,$8,kbdin3
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beq $17,$8,kbdin3
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j kbdin5
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j kbdin5
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kbdin3:
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kbdin3:
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jal kbdinp
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jal kbdinp
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bne $2,$16,kbdin2
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bne $2,$16,kbdin2
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kbdin4:
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kbdin4:
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add $4,$16,$0 ; use key 1
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add $4,$16,$0 ; use key 1
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add $5,$0,xltbl1 ; with translation table 1
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add $5,$0,xltbl1 ; with translation table 1
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jal xlat
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jal xlat
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j kbdx
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j kbdx
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kbdin5:
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kbdin5:
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jal kbdinp
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jal kbdinp
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add $8,$0,0xF0
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add $8,$0,0xF0
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bne $2,$8,kbdin5
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bne $2,$8,kbdin5
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kbdin6:
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kbdin6:
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jal kbdinp
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jal kbdinp
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beq $2,$16,kbdin7
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beq $2,$16,kbdin7
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beq $2,$17,kbdin9
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beq $2,$17,kbdin9
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j kbdin5
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j kbdin5
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kbdin7:
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kbdin7:
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jal kbdinp
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jal kbdinp
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add $8,$0,0xF0
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add $8,$0,0xF0
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bne $2,$8,kbdin7
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bne $2,$8,kbdin7
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kbdin8:
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kbdin8:
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jal kbdinp
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jal kbdinp
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bne $2,$17,kbdin7
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bne $2,$17,kbdin7
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j kbdin11
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j kbdin11
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kbdin9:
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kbdin9:
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jal kbdinp
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jal kbdinp
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add $8,$0,0xF0
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add $8,$0,0xF0
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bne $2,$8,kbdin9
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bne $2,$8,kbdin9
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kbdin10:
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kbdin10:
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jal kbdinp
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jal kbdinp
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bne $2,$16,kbdin9
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bne $2,$16,kbdin9
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j kbdin11
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j kbdin11
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kbdin11:
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kbdin11:
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add $8,$0,0x12 ; left shift key
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add $8,$0,0x12 ; left shift key
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beq $16,$8,kbdin12
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beq $16,$8,kbdin12
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add $8,$0,0x59 ; right shift key
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add $8,$0,0x59 ; right shift key
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beq $16,$8,kbdin12
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beq $16,$8,kbdin12
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add $8,$0,0x14 ; ctrl key
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add $8,$0,0x14 ; ctrl key
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beq $16,$8,kbdin14
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beq $16,$8,kbdin14
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j kbdin13
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j kbdin13
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kbdin12:
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kbdin12:
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add $4,$17,$0 ; use key 2
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add $4,$17,$0 ; use key 2
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add $5,$0,xltbl2 ; with translation table 2
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add $5,$0,xltbl2 ; with translation table 2
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jal xlat
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jal xlat
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j kbdx
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j kbdx
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kbdin13:
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kbdin13:
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add $4,$16,$0 ; use key 1
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add $4,$16,$0 ; use key 1
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add $5,$0,xltbl1 ; with translation table 1
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add $5,$0,xltbl1 ; with translation table 1
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jal xlat
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jal xlat
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j kbdx
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j kbdx
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kbdin14:
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kbdin14:
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add $4,$17,$0 ; use key 2
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add $4,$17,$0 ; use key 2
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add $5,$0,xltbl1 ; with translation table 1
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add $5,$0,xltbl1 ; with translation table 1
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jal xlat
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jal xlat
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and $2,$2,0xFF-0x60 ; then reset bits 0x60
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and $2,$2,0xFF-0x60 ; then reset bits 0x60
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j kbdx
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j kbdx
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kbdx:
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kbdx:
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ldw $17,$29,0
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ldw $17,$29,0
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ldw $16,$29,4
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ldw $16,$29,4
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ldw $31,$29,8
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ldw $31,$29,8
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add $29,$29,12
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add $29,$29,12
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jr $31
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jr $31
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kbdinp:
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kbdinp:
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add $8,$0,kbdbase
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add $8,$0,kbdbase
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kbdinp1:
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kbdinp1:
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ldw $9,$8,0
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ldw $9,$8,0
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and $9,$9,1
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and $9,$9,1
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beq $9,$0,kbdinp1 ; wait until character ready
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beq $9,$0,kbdinp1 ; wait until character ready
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ldw $2,$8,4 ; get character
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ldw $2,$8,4 ; get character
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add $9,$0,0xE0
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add $9,$0,0xE0
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beq $2,$9,kbdinp1 ; ignore E0 prefix
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beq $2,$9,kbdinp1 ; ignore E0 prefix
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add $9,$0,0xE1
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add $9,$0,0xE1
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beq $2,$9,kbdinp1 ; as well as E1 prefix
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beq $2,$9,kbdinp1 ; as well as E1 prefix
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jr $31
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jr $31
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xlat:
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xlat:
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sub $29,$29,8
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sub $29,$29,8
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stw $31,$29,4
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stw $31,$29,4
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stw $16,$29,0
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stw $16,$29,0
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and $16,$4,0xFF
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and $16,$4,0xFF
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add $8,$16,$5
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add $8,$16,$5
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ldbu $2,$8,0
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ldbu $2,$8,0
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bne $2,$0,xlat1
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bne $2,$0,xlat1
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; add $4,$0,'<'
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; add $4,$0,'<'
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; jal cout
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; jal cout
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; add $4,$16,$0
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; add $4,$16,$0
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; jal byteout
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; jal byteout
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; add $4,$0,'>'
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; add $4,$0,'>'
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; jal cout
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; jal cout
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add $2,$16,$0
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add $2,$16,$0
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xlat1:
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xlat1:
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ldw $16,$29,0
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ldw $16,$29,0
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ldw $31,$29,4
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ldw $31,$29,4
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add $29,$29,8
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add $29,$29,8
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jr $31
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jr $31
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