mirror of
https://github.com/Asraelite/littlebigcomputer.git
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59 lines
1.4 KiB
Text
59 lines
1.4 KiB
Text
; Parva CPU version 0.1
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; Parva GPU version 0.1 on IO port 0x1
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nop
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b _start
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string:
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.data 1 2 3 3 4 8 5 4 6 3 7 0
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characters:
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; upper 24 pixels, lower 24 pixels, width
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char_null: ; 0
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.data 0
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characters_plus_1:
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.data 0
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characters_plus_2:
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.data 0
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char_H: ; 1
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.data 0b000000_100010_100010_111110 0b100010_100010_100010_000000 6
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char_e: ; 2
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.data 0b000000_000000_011000_100100 0b111100_100000_011100_000000 5
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char_l: ; 3
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.data 0b000000_100000_100000_100000 0b100000_100000_010000_000000 3
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char_o: ; 4
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.data 0b000000_000000_011000_100100 0b100100_100100_011000_000000 5
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char_w: ; 5
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.data 0b000000_000000_101010_101010 0b101010_101010_010100_000000 6
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char_r: ; 6
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.data 0b000000_000000_011000_100000 0b100000_100000_100000_000000 4
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char_d: ; 7
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.data 0b000000_000100_011100_100100 0b100100_100100_011100_000000 5
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char_space: ; 8
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.data 0 0 4
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_start:
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sw x0, 0b01_0100_000000(upper) ; gpu clear screen
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li x6, 1 ; x position
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li x7, 1 ; y position
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li x0, string
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loop:
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sd x67, 0b01_0000_000000(upper) ; gpu move cursor
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lw x1, 0(x0) ; x1 = current character
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beqz x1, end
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add x2, x1, x1
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add x1, x2, x1 ; x1 *= 3
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lw x2, characters(x1) ; upper 24 pixels
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lw x3, characters_plus_1(x1) ; lower 24 pixels
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sd x01, 0b01_0011_000000(upper) ; gpu print buffer to screen
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sd x23, 0b01_0010_000000(upper) ; gpu print 6x8 char
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lw x4, characters_plus_2(x1) ; width
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add x6, x6, x4 ; x position += width
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addi x0, x0, 1
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b loop
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end:
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sd x01, 0b01_0011_000000(upper) ; gpu print buffer to screen
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wfi
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