102 lines
1.7 KiB
C#
102 lines
1.7 KiB
C#
;;;
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;;;
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;;; libconio_arch-small.hS
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;;;
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;;; Architecture depend libconio implementation.
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;;; This assembler source contributes basically saving for speed and memory.
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;;;
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;;; @author Takahide Matsutsuka <markn@markn.org>
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;;;
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;;; $Id: libconio_arch-small.cS,v 1.1 2007/09/30 12:46:34 matsutsuka Exp $
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;;;
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;; uses preprocessor to enable definitions
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#include "ctk_arch-def.h"
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;; export symbols
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.globl _clrscr_arch
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.globl _libputc_arch
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.area _DATA
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_screen_offset::
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.ds 2
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.area _CODE
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_libconio_arch_small_start::
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_clrscr_arch:
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ld hl, #0
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ld (#_screen_offset), hl
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ld hl, #VRAM_CHAR
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ld bc, #VRAM_CHAR + #SCREEN_HEIGHT * #SCREEN_WIDTH
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_clrscr_arch_loop1:
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ld (hl), #CH_SPACE
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inc hl
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ld a, h
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cp b
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jr nz, _clrscr_arch_loop1
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ld a, l
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cp c
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jr nz, _clrscr_arch_loop1
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ld hl, #VRAM_ATTR
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ld bc, #VRAM_ATTR + #SCREEN_HEIGHT * #SCREEN_WIDTH
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_clrscr_arch_loop2:
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ld (hl), #COLOR_NORMAL
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inc hl
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ld a, h
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cp b
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jr nz, _clrscr_arch_loop2
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ld a, l
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cp c
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jr nz, _clrscr_arch_loop2
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ret
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_libputc_arch:
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ld hl, #2
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add hl, sp
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ld a, (hl)
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_libputc_asm::
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push af
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ld hl, (#_screen_offset)
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ld bc, #SCREEN_HEIGHT * #SCREEN_WIDTH
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ld a, b
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cp h
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jr nz, _libputc_arch_putc
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ld a, c
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cp l
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jr z, _libputc_arch_scroll
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_libputc_arch_putc:
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ld bc, #VRAM_CHAR
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add hl, bc
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pop af
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ld (hl), a
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ld hl, #_screen_offset
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inc (hl)
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ret nz
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inc hl
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inc (hl)
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ret
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_libputc_arch_scroll:
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push de
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ld hl, #VRAM_CHAR + #SCREEN_WIDTH
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ld de, #VRAM_CHAR
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ld bc, #SCREEN_HEIGHT * #SCREEN_WIDTH - #SCREEN_WIDTH
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push bc
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push de
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ldir
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pop de
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pop hl
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push hl
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ld (#_screen_offset), hl
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ld b, #SCREEN_WIDTH
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add hl, de
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_libputc_arch_scroll_loop:
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ld (hl), #CH_SPACE
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inc hl
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djnz _libputc_arch_scroll_loop
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pop hl
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pop de
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jr _libputc_arch_putc
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_libconio_arch_small_end::
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