diff options
| author | Joseph Hunkeler <jhunkeler@gmail.com> | 2018-05-15 10:31:32 -0400 |
|---|---|---|
| committer | Joseph Hunkeler <jhunkeler@gmail.com> | 2018-05-15 10:31:32 -0400 |
| commit | 43960f8fef678dbbdec3f93087ce957026368eb0 (patch) | |
| tree | 3bc5bd670afcd8a8cf4dc456d0c086eb876cb2ed /console.asm | |
| parent | 839668f155a216c7ef4170bc3b8d662fbc857f1d (diff) | |
| download | minos-43960f8fef678dbbdec3f93087ce957026368eb0.tar.gz | |
* Use refactored ASCII equates
* Global video page defined in memory, rather than statically
Diffstat (limited to 'console.asm')
| -rw-r--r-- | console.asm | 46 |
1 files changed, 29 insertions, 17 deletions
diff --git a/console.asm b/console.asm index de4fdb7..8b33231 100644 --- a/console.asm +++ b/console.asm @@ -16,7 +16,7 @@ putc: jl .non_graphical mov ah, 0ah ; BIOS - write character - mov bx, 00h ; video page zero + mov bh, [video_page] ; video page zero mov cx, 01h ; repeat character N times int 10h ; BIOS video service @@ -44,7 +44,7 @@ console_scroll_up: ; scroll window up: mov ah, 06h ; scroll up function id. mov al, 1 ; lines to scroll. - mov bx, 0700h ; attribute for new lines. + mov bh, 07h ; attribute for new lines. mov cl, 0 ; upper col. mov ch, 0 ; upper row. mov dl, MAX_COLS ; lower col. @@ -88,19 +88,19 @@ console_driver: .do_ascii: ; ASCII control block - cmp al, SPC + cmp al, ASCII_SPC jae .handle_SPC - cmp al, TAB + cmp al, ASCII_TAB je .handle_TAB - cmp al, BS + cmp al, ASCII_BS je .handle_BS - cmp al, CR + cmp al, ASCII_CR je .handle_CR - cmp al, LF + cmp al, ASCII_LF je .handle_LF ; etc... @@ -129,7 +129,7 @@ console_driver: .skip_bs: mov ah, 0ah mov al, 20h - mov bx, 00h + mov bh, byte [video_page] mov cx, 1 int 10h jmp .return_noupdate @@ -161,8 +161,7 @@ cls: mov ah, 07h ; BIOS - scroll down mov al, 00h ; lines to scroll (0 == entire screen) - mov bx, 0700h ; color white/black - ; & video page zero + mov bh, 07h ; color white/black mov cx, 0 mov dh, 24 ; rows mov dl, 79 ; cols @@ -179,7 +178,7 @@ console_cursor_getpos: pusha mov ah, 03h ; BIOS - query cursor position and size - mov bh, 00h ; video page zero + mov bh, byte [video_page] ; video page zero int 10h mov [cursor_sl_start], byte ch ; record data @@ -198,8 +197,8 @@ console_cursor_read: push ax push bx - mov ah, 08h ; BIOS - read character/attr at cursor - mov bh, 00h ; video page zero + mov ah, 08h ; BIOS - read character/attr at cursor + mov bh, byte[video_page] ; video page int 10h mov [cursor_attr], byte ah @@ -253,15 +252,27 @@ console_cursor_read_last: ret +console_set_video_page: + push bp + mov bp, sp + + mov [video_page], dl + mov ah, 05h + mov al, [video_page] + int 10h + + pop bp + ret + setcursor: push bp mov bp, sp pusha - mov ah, 02h ; BIOS - set cursor position - mov bh, 0 ; video page zero - mov dx, [bp + 4] ; address of new cursor value - int 10h ; BIOS video service + mov ah, 02h ; BIOS - set cursor position + mov bh, byte [video_page] ; video page + mov dx, [bp + 4] ; address of new cursor value + int 10h ; BIOS video service popa mov sp, bp @@ -270,6 +281,7 @@ setcursor: ; data +video_page: db 0 cursor_sl_start: db 0 cursor_sl_end: db 0 cursor_row: db 0 |