project: Initial commit

Signed-off-by: Ian Moffett <ian@osmora.org>

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;
+}