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Removed IRQ support from TGI drivers.

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All but one TGI drivers didn't use IRQs. Especially when the TGI driver kernel was the only .interruptor this meant quite some unnecessary overhead because it pulled in the whole IRQ infrastructure.

The one driver using IRQs (the graphics driver for the 160x102x16 mode on the Lynx) now uses a library reference to set up a JMP to its IRQ handler.
This commit is contained in:
Oliver Schmidt
2018-02-02 18:15:45 +01:00
parent 7521ae888a
commit dacee3b9ed
17 changed files with 37 additions and 40 deletions
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18
libsrc/tgi/tgi-kernel.s
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@@ -6,7 +6,6 @@
.import tgi_libref
.importzp ptr1
.interruptor tgi_irq ; Export as IRQ handler
.include "tgi-kernel.inc"
.include "tgi-error.inc"
@@ -81,7 +80,6 @@ tgi_line: jmp $0000
tgi_bar: jmp $0000
tgi_textstyle: jmp $0000
tgi_outtext: jmp $0000
tgi_irq: .byte $60, $00, $00 ; RTS plus two dummy bytes
; Driver header signature
.rodata
@@ -144,20 +142,13 @@ _tgi_install:
dex
bpl @L3
; Install the IRQ vector if the driver needs it.
lda tgi_irq+2 ; Check high byte of IRQ vector
beq @L4 ; Jump if vector invalid
lda #$4C ; Jump opcode
sta tgi_irq ; Activate IRQ routine
; Initialize some other variables
lda #$00
@L4: ldx #csize-1
@L5: sta cstart,x ; Clear error/mode/curx/cury/...
ldx #csize-1
@L4: sta cstart,x ; Clear error/mode/curx/cury/...
dex
bpl @L5
bpl @L4
rts
@@ -206,9 +197,6 @@ _tgi_uninstall:
jsr tgi_uninstall ; Allow the driver to clean up
lda #$60 ; RTS opcode
sta tgi_irq ; Disable IRQ entry point
; Clear driver pointer and error code
tgi_clear_ptr: