diff options
Diffstat (limited to 'sys/dev/cons/cons.c')
| -rw-r--r-- | sys/dev/cons/cons.c | 151 |
1 files changed, 151 insertions, 0 deletions
diff --git a/sys/dev/cons/cons.c b/sys/dev/cons/cons.c new file mode 100644 index 0000000..76f71a7 --- /dev/null +++ b/sys/dev/cons/cons.c @@ -0,0 +1,151 @@ +/* + * Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * 1. Redistributions of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of Hyra nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +#include <sys/param.h> +#include <sys/types.h> +#include <sys/ascii.h> +#include <dev/video/fbdev.h> +#include <dev/cons/font.h> +#include <dev/cons/cons.h> +#include <string.h> + +struct cons_screen g_root_scr = {0}; + +/* + * Render a character onto the screen. + * + * @scr: Screen to render to. + * @c: Char to render. + * @x: X position of char. + * @y: Y position of char. + */ +static void +cons_render_char(struct cons_screen *scr, char c, uint32_t x, uint32_t y) +{ + size_t idx; + const uint8_t *glyph; + + glyph = &CONS_FONT[(int)c*16]; + + for (uint32_t cy = 0; cy < FONT_HEIGHT; ++cy) { + for (uint32_t cx = 0; cx < FONT_WIDTH; ++cx) { + idx = fbdev_get_index(&scr->fbdev, x+FONT_WIDTH-cx, y+cy); + scr->fb_mem[idx] = ISSET(glyph[cy], BIT(cx)) ? scr->fg : scr->bg; + } + } +} + +/* + * Clear the screen. + * + * @scr: Screen to clear. + * @bg: Color to clear it to. + */ +static void +cons_clear_scr(struct cons_screen *scr, uint32_t bg) +{ + struct fbdev fbdev = scr->fbdev; + + for (size_t i = 0; i < fbdev.height * fbdev.pitch; ++i) { + scr->fb_mem[i] = bg; + } +} + +/* + * Handle a special character (e.g "\t", "\n", etc) + * + * @scr: Screen to handle this on. + * @c: Char to handle. + * + * Returns 0 if handled, otherwise -1. + */ +static int +cons_handle_special(struct cons_screen *scr, char c) +{ + switch (c) { + case ASCII_LF: + /* Make a newline */ + scr->ch_col = 0; + ++scr->ch_row; + return 0; + } + + return -1; +} + + +/* + * Put a character on the screen. + * + * @scr: Screen. + * @c: Character to draw. + */ +int +cons_putch(struct cons_screen *scr, char c) +{ + if (scr->ch_col > scr->ncols) { + /* Make a newline as we past the max col */ + scr->ch_col = 0; + ++scr->ch_row; + } + + if (scr->ch_row > scr->nrows) { + /* Went over the screen size */ + scr->ch_col = 0; + scr->ch_row = 0; + cons_clear_scr(scr, scr->bg); + } + + /* + * If this is a special char that we can handle + * then handle it and return. + */ + if (cons_handle_special(scr, c) == 0) { + return 0; + } + + cons_render_char(scr, c, scr->ch_col * FONT_WIDTH, + scr->ch_row * FONT_HEIGHT); + + ++scr->ch_col; + return 0; +} + +void +cons_init(void) +{ + struct fbdev fbdev = fbdev_get(); + + g_root_scr.fg = 0x00AA00; + g_root_scr.bg = 0x000000; + g_root_scr.fb_mem = fbdev.mem; + g_root_scr.nrows = fbdev.height / FONT_HEIGHT; + g_root_scr.ncols = fbdev.width / FONT_WIDTH; + g_root_scr.fbdev = fbdev; +} |