altos: Add console driver using VGA and PS/2

Provides an interactive text console.

Signed-off-by: Keith Packard <keithp@keithp.com>

diff --git a/src/drivers/ao_console.c b/src/drivers/ao_console.c
new file mode 100644 (file)
index 0000000..cbde38c
--- /dev/null
+++ b/src/drivers/ao_console.c
@@ -0,0 +1,151 @@
+/*
+ * Copyright © 2016 Keith Packard <keithp@keithp.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ */
+
+#include "ao.h"
+#include "ao_console.h"
+#include "ao_ps2.h"
+#include "ao_vga.h"
+
+static uint8_t console_row, console_col;
+
+#define ao_console_bitmap      ao_vga_bitmap
+
+static uint8_t console_rows, console_cols;
+
+static void
+ao_console_scroll(void)
+{
+       ao_copy(&ao_console_bitmap,
+               0, 0,
+               ao_console_bitmap.width,
+               ao_console_bitmap.height - ao_font.height,
+               &ao_console_bitmap,
+               0, ao_font.height,
+               AO_COPY);
+       ao_rect(&ao_console_bitmap,
+               0,
+               (console_rows - 1) * ao_font.height,
+               ao_console_bitmap.width,
+               ao_font.height,
+               1,
+               AO_COPY);
+}
+
+static void
+ao_console_cursor(void)
+{
+       ao_rect(&ao_console_bitmap,
+               console_col * ao_font.width,
+               console_row * ao_font.height,
+               ao_font.width,
+               ao_font.height,
+               1,
+               AO_XOR);
+}
+
+static void
+ao_console_clear(void)
+{
+       ao_rect(&ao_console_bitmap,
+               0, 0,
+               ao_console_bitmap.width,
+               ao_console_bitmap.height,
+               1,
+               AO_COPY);
+}
+
+static void
+ao_console_space(void)
+{
+       ao_rect(&ao_console_bitmap,
+               console_col * ao_font.width,
+               console_row * ao_font.height,
+               ao_font.width,
+               ao_font.height,
+               1,
+               AO_COPY);
+}
+
+static void
+ao_console_newline(void)
+{
+       if (++console_row == console_rows) {
+               ao_console_scroll();
+               console_row--;
+       }
+}
+
+void
+ao_console_putchar(char c)
+{
+       if (' ' <= c && c < 0x7f) {
+               char    text[2];
+               ao_console_space();
+               text[0] = c;
+               text[1] = '\0';
+               ao_text(&ao_console_bitmap,
+                       console_col * ao_font.width,
+                       console_row * ao_font.height + ao_font.ascent,
+                       text,
+                       0,
+                       AO_COPY);
+               if (++console_col == console_cols) {
+                       console_col = 0;
+                       ao_console_newline();
+               }
+       } else {
+               ao_console_cursor();
+               switch (c) {
+               case '\r':
+                       console_col = 0;
+                       break;
+               case '\t':
+                       console_col += 8 - (console_col & 7);
+                       if (console_col >= console_cols) {
+                               console_col = 0;
+                               ao_console_newline();
+                       }
+                       break;
+               case '\n':
+                       ao_console_newline();
+                       break;
+               case '\f':
+                       console_col = console_row = 0;
+                       ao_console_clear();
+                       break;
+               case '\177':
+               case '\010':
+                       if (console_col)
+                               console_col--;
+                       break;
+               }
+       }
+       ao_console_cursor();
+}
+
+void
+ao_console_init(void)
+{
+       console_cols = ao_console_bitmap.width / ao_font.width;
+       console_rows = ao_console_bitmap.height / ao_font.height;
+#if CONSOLE_STDIN
+       ao_ps2_stdin = 1;
+       ao_add_stdio(_ao_ps2_pollchar,
+                    ao_console_putchar,
+                    NULL);
+#endif
+       ao_console_clear();
+       ao_console_cursor();
+       ao_vga_enable(1);
+}

diff --git a/src/drivers/ao_console.h b/src/drivers/ao_console.h
new file mode 100644 (file)
index 0000000..33d3658
--- /dev/null
+++ b/src/drivers/ao_console.h
@@ -0,0 +1,24 @@
+/*
+ * Copyright © 2016 Keith Packard <keithp@keithp.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ */
+
+#ifndef _AO_CONSOLE_H_
+#define _AO_CONSOLE_H_
+
+void
+ao_console_putchar(char c);
+
+void
+ao_console_init(void);
+
+#endif /* _AO_CONSOLE_H_ */