libpayload: Add video console framework

Add a framework for multiple video console drivers.  This is to prepare
for the Geode driver.

Signed-off-by: Jordan Crouse <jordan.crouse@amd.com>
Acked-by: Uwe Hermann <uwe@hermann-uwe.de>



git-svn-id: svn://svn.coreboot.org/coreboot/trunk@3230 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

payloads/libpayload/drivers/video/vga.c

@@ -0,0 +1,140 @@
+/*
+ * This file is part of the libpayload project.
+ *
+ * Copyright (C) 2008 Advanced Micro Devices, Inc.
+ *
+ * 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. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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 <libpayload.h>
+#include <video_console.h>
+
+#define VGA_COLOR_WHITE 7
+
+#define CRTC_INDEX      0x3d4
+#define CRTC_DATA       0x3d5
+
+#define VIDEO(_r, _c)\
+  ((u16 *) (0xB8000 + ((_r) * (VIDEO_COLS * 2)) + ((_c) * 2)))
+
+static u8 crtc_read(u8 index)
+{
+        outb(index, CRTC_INDEX);
+        return inb(CRTC_DATA);
+}
+
+static void crtc_write(u8 data, u8 index)
+{
+        outb(index, CRTC_INDEX);
+        outb(data, CRTC_DATA);
+}
+
+static void vga_get_cursor(unsigned int *x, unsigned int *y, unsigned int *en)
+{
+	unsigned int addr;
+	addr = ((unsigned int) crtc_read(0x0E)) << 8;
+	addr += crtc_read(0x0E);
+
+	*x = addr % VIDEO_COLS;
+	*y = addr / VIDEO_COLS;
+
+	*en = !(crtc_read(0x0A) & (1 << 5));
+}
+
+static void vga_set_cursor(unsigned int x, unsigned int y)
+{
+	unsigned int addr;
+
+	addr = x + (VIDEO_COLS * y);
+	crtc_write(addr >> 8, 0x0E);
+	crtc_write(addr, 0x0E);
+}
+
+static void vga_enable_cursor(int state)
+{
+	unsigned char tmp = crtc_read(0x0a);
+
+	if (state == 0)
+		tmp |= (1 << 5);
+
+	else
+		tmp &= ~(1 << 5);
+
+	crtc_write(tmp, 0x0a);
+}
+
+static void vga_clear_line(u8 row, u8 ch, u8 attr)
+{
+	int col;
+	u16 *ptr = VIDEO(0, row);
+
+	for(col = 0; col < VIDEO_COLS; col++)
+		ptr[col] = ((attr & 0xFF) << 8) | (ch & 0xFF);
+}
+
+static void vga_scroll_up(void)
+{
+	u16 *src = VIDEO(0,1);
+	u16 *dst = VIDEO(0,0);
+	int i;
+
+	for(i = 0; i < (VIDEO_ROWS - 1) * VIDEO_COLS; i++)
+		*dst++ = *src++;
+
+	vga_clear_line(VIDEO_ROWS - 1, ' ', VGA_COLOR_WHITE);
+}
+
+static void vga_fill(u8 ch, u8 attr)
+{
+	u8 row;
+	for(row = 0; row < VIDEO_ROWS; row++)
+		vga_clear_line(row, ch, attr);
+}
+
+static void vga_clear(void)
+{
+	vga_fill(' ', VGA_COLOR_WHITE);
+}
+
+static void vga_putc(u8 row, u8 col, unsigned int c)
+{
+	u16 *ptr = VIDEO(row, col);
+	*ptr = (u16) (c & 0xFFFF);
+}
+
+static int vga_init(void)
+{
+	return 0;
+}
+
+struct video_console vga_video_console = {
+	.init = vga_init,
+	.putc = vga_putc,
+	.clear = vga_clear,
+	.scroll_up = vga_scroll_up,
+
+	.get_cursor = vga_get_cursor,
+	.set_cursor = vga_set_cursor,
+	.enable_cursor = vga_enable_cursor,
+};