diff options
Diffstat (limited to 'boot.subx')
| -rw-r--r-- | boot.subx | 207 |
1 files changed, 89 insertions, 118 deletions
diff --git a/boot.subx b/boot.subx index ed2d213e..6982fccb 100644 --- a/boot.subx +++ b/boot.subx @@ -359,125 +359,96 @@ keyboard-interrupt-handler: 3c/compare-al-and 0/imm8 75/jump-if-!= $keyboard-interrupt-handler:epilogue/disp8 # - read keycode - 31/xor %eax 0/r32/eax e4/read-port-into-al 0x60/imm8 - # -#? 50/push-eax -#? 51/push-ecx -#? (draw-int32-hex-wrapping-right-then-down-over-full-screen 0 %eax 0 0 7 0) -#? 59/pop-to-ecx -#? 58/pop-to-eax - # -#? 50/push-eax -#? 51/push-ecx -#? (draw-int32-decimal-wrapping-right-then-down 0 %eax 0 2 0x400 2 0 2 7 0) - 89/<- %ecx 0/r32/eax - # . . push args - 68/push 0/imm32/bg - 68/push 7/imm32/fg - 68/push 2/imm32/y - 68/push 0x400/imm32/xmax - 68/push 0/imm32/xmin -#? 68/push 0x48/imm32/n - 51/push-ecx - 68/push 0/imm32/screen - # . . call -#? e8/call draw-int32-hex-wrapping-right-then-down/disp32 -#? e8/call draw-int32-decimal-wrapping-right-then-down/disp32 - e8/call draw-int32-decimal-rightward/disp32 - # . . discard args - 81 0/subop/add %esp 0x1c/imm32 -#? 59/pop-to-ecx -#? 58/pop-to-eax -#? # - key released -#? # if (al == 0xaa) shift = false # left shift is being lifted -#? { -#? 3c/compare-al-and 0xaa/imm8 -#? 75/jump-if-!= break/disp8 -#? # *shift = 0 -#? c7 0/subop/copy *Keyboard-shift-pressed? 0/imm32 -#? } -#? # if (al == 0xb6) shift = false # right shift is being lifted -#? { -#? 3c/compare-al-and 0xb6/imm8 -#? 75/jump-if-!= break/disp8 -#? # *shift = 0 -#? c7 0/subop/copy *Keyboard-shift-pressed? 0/imm32 -#? } -#? # if (al == 0x9d) ctrl = false # ctrl is being lifted -#? { -#? 3c/compare-al-and 0x9d/imm8 -#? 75/jump-if-!= break/disp8 -#? # *ctrl = 0 -#? c7 0/subop/copy *Keyboard-ctrl-pressed? 0/imm32 -#? } -#? # if (al & 0x80) a key is being lifted; return -#? 50/push-eax -#? 24/and-al-with 0x80/imm8 -#? 3c/compare-al-and 0/imm8 -#? 58/pop-to-eax -#? 75/jump-if-!= $keyboard-interrupt-handler:epilogue/disp8 -#? # - key pressed -#? # if (al == 0x2a) shift = true, return # left shift pressed -#? { -#? 3c/compare-al-and 0x2a/imm8 -#? 75/jump-if-!= break/disp8 -#? # *shift = 1 -#? c7 0/subop/copy *Keyboard-shift-pressed? 1/imm32 -#? # return -#? eb/jump $keyboard-interrupt-handler:epilogue/disp8 -#? } -#? # if (al == 0x36) shift = true, return # right shift pressed -#? { -#? 3c/compare-al-and 0x36/imm8 -#? 75/jump-if-!= break/disp8 -#? # *shift = 1 -#? c7 0/subop/copy *Keyboard-shift-pressed? 1/imm32 -#? # return -#? eb/jump $keyboard-interrupt-handler:epilogue/disp8 -#? } -#? # if (al == 0x1d) ctrl = true, return -#? { -#? 3c/compare-al-and 0x1d/imm8 -#? 75/jump-if-!= break/disp8 -#? # *ctrl = 1 -#? c7 0/subop/copy *Keyboard-ctrl-pressed? 1/imm32 -#? # return -#? eb/jump $keyboard-interrupt-handler:epilogue/disp8 -#? } -#? # - convert key to character -#? # if (shift) use keyboard shift map -#? { -#? 81 7/subop/compare *Keyboard-shift-pressed? 0/imm32 -#? 74/jump-if-= break/disp8 -#? # sigils don't currently support labels inside *(eax+label) -#? 05/add-to-eax Keyboard-shift-map/imm32 -#? 8a/byte-> *eax 0/r32/al -#? eb/jump $keyboard-interrupt-handler:select-map-done/disp8 -#? } -#? # if (ctrl) al = *(ctrl map + al) -#? { -#? 81 7/subop/compare *Keyboard-ctrl-pressed? 0/imm32 -#? 74/jump-if-= break/disp8 -#? 05/add-to-eax Keyboard-ctrl-map/imm32 -#? 8a/byte-> *eax 0/r32/al -#? eb/jump $keyboard-interrupt-handler:select-map-done/disp8 -#? } -#? # otherwise al = *(normal map + al) -#? 05/add-to-eax Keyboard-normal-map/imm32 -#? 8a/byte-> *eax 0/r32/al -#? $keyboard-interrupt-handler:select-map-done: -#? # - if there's no character mapping, return -#? { -#? 3c/compare-al-and 0/imm8 -#? 74/jump-if-= break/disp8 -#? # - store al in keyboard buffer -#? 88/<- *ecx 0/r32/al -#? # increment index -#? fe/increment-byte *Keyboard-buffer:write -#? # clear top nibble of index (keyboard buffer is circular) -#? 80 4/subop/and-byte *Keyboard-buffer:write 0x0f/imm8 -#? } + # - key released + # if (al == 0xaa) shift = false # left shift is being lifted + { + 3c/compare-al-and 0xaa/imm8 + 75/jump-if-!= break/disp8 + # *shift = 0 + c7 0/subop/copy *Keyboard-shift-pressed? 0/imm32 + } + # if (al == 0xb6) shift = false # right shift is being lifted + { + 3c/compare-al-and 0xb6/imm8 + 75/jump-if-!= break/disp8 + # *shift = 0 + c7 0/subop/copy *Keyboard-shift-pressed? 0/imm32 + } + # if (al == 0x9d) ctrl = false # ctrl is being lifted + { + 3c/compare-al-and 0x9d/imm8 + 75/jump-if-!= break/disp8 + # *ctrl = 0 + c7 0/subop/copy *Keyboard-ctrl-pressed? 0/imm32 + } + # if (al & 0x80) a key is being lifted; return + 50/push-eax + 24/and-al-with 0x80/imm8 + 3c/compare-al-and 0/imm8 + 58/pop-to-eax + 75/jump-if-!= $keyboard-interrupt-handler:epilogue/disp8 + # - key pressed + # if (al == 0x2a) shift = true, return # left shift pressed + { + 3c/compare-al-and 0x2a/imm8 + 75/jump-if-!= break/disp8 + # *shift = 1 + c7 0/subop/copy *Keyboard-shift-pressed? 1/imm32 + # return + eb/jump $keyboard-interrupt-handler:epilogue/disp8 + } + # if (al == 0x36) shift = true, return # right shift pressed + { + 3c/compare-al-and 0x36/imm8 + 75/jump-if-!= break/disp8 + # *shift = 1 + c7 0/subop/copy *Keyboard-shift-pressed? 1/imm32 + # return + eb/jump $keyboard-interrupt-handler:epilogue/disp8 + } + # if (al == 0x1d) ctrl = true, return + { + 3c/compare-al-and 0x1d/imm8 + 75/jump-if-!= break/disp8 + # *ctrl = 1 + c7 0/subop/copy *Keyboard-ctrl-pressed? 1/imm32 + # return + eb/jump $keyboard-interrupt-handler:epilogue/disp8 + } + # - convert key to character + # if (shift) use keyboard shift map + { + 81 7/subop/compare *Keyboard-shift-pressed? 0/imm32 + 74/jump-if-= break/disp8 + # sigils don't currently support labels inside *(eax+label) + 05/add-to-eax Keyboard-shift-map/imm32 + 8a/byte-> *eax 0/r32/al + eb/jump $keyboard-interrupt-handler:select-map-done/disp8 + } + # if (ctrl) al = *(ctrl map + al) + { + 81 7/subop/compare *Keyboard-ctrl-pressed? 0/imm32 + 74/jump-if-= break/disp8 + 05/add-to-eax Keyboard-ctrl-map/imm32 + 8a/byte-> *eax 0/r32/al + eb/jump $keyboard-interrupt-handler:select-map-done/disp8 + } + # otherwise al = *(normal map + al) + 05/add-to-eax Keyboard-normal-map/imm32 + 8a/byte-> *eax 0/r32/al +$keyboard-interrupt-handler:select-map-done: + # - if there's no character mapping, return + { + 3c/compare-al-and 0/imm8 + 74/jump-if-= break/disp8 + # - store al in keyboard buffer + 88/<- *ecx 0/r32/al + # increment index + fe/increment-byte *Keyboard-buffer:write + # clear top nibble of index (keyboard buffer is circular) + 80 4/subop/and-byte *Keyboard-buffer:write 0x0f/imm8 + } $keyboard-interrupt-handler:epilogue: # epilogue 9d/pop-flags |