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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2007 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
/*
* Miniature VGA driver for bootstrap.
*/
#include <sys/archsystm.h>
#include <sys/vgareg.h>
#include "boot_vga.h"
#if defined(_BOOT)
#include "../dboot/dboot_asm.h"
#include "../dboot/dboot_xboot.h"
#endif
#define VGA_COLOR_CRTC_INDEX 0x3d4
#define VGA_COLOR_CRTC_DATA 0x3d5
#if defined(__xpv) && defined(_BOOT)
/*
* Device memory address
*
* In dboot under the hypervisor we don't have any memory mappings
* for the first meg of low memory so we can't access devices there.
* Intead we've mapped the device memory that we need to access into
* a local variable within dboot so we can access the device memory
* there.
*/
extern unsigned short *video_fb;
#define VGA_SCREEN ((unsigned short *)video_fb)
#else /* __xpv && _BOOT */
/* Device memory address */
#define VGA_SCREEN ((unsigned short *)0xb8000)
#endif /* __xpv && _BOOT */
static void vga_set_crtc(int index, unsigned char val);
static unsigned char vga_get_crtc(int index);
void
vga_cursor_display(void)
{
unsigned char val, msl;
/*
* Figure out the maximum scan line value. We need this to set the
* cursor size.
*/
msl = vga_get_crtc(VGA_CRTC_MAX_S_LN) & 0x1f;
/*
* Enable the cursor and set it's size. Preserve the upper two
* bits of the control register.
* - Bits 0-4 are the starting scan line of the cursor.
* Scanning is done from top-to-bottom. The top-most scan
* line is 0 and the bottom most scan line is the maximum scan
* line value.
* - Bit 5 is the cursor disable bit.
*/
val = vga_get_crtc(VGA_CRTC_CSSL);
vga_set_crtc(VGA_CRTC_CSSL, (val & 0xc) | ((msl - 2) & 0x1f));
/*
* Continue setting the cursors size.
* - Bits 0-4 are the ending scan line of the cursor.
* Scanning is done from top-to-bottom. The top-most scan
* line is 0 and the bottom most scan line is the maximum scan
* line value.
* - Bits 5-6 are the cursor skew.
*/
vga_set_crtc(VGA_CRTC_CESL, msl);
}
void
vga_clear(int color)
{
unsigned short val;
int i;
val = (color << 8) | ' ';
for (i = 0; i < VGA_TEXT_ROWS * VGA_TEXT_COLS; i++) {
VGA_SCREEN[i] = val;
}
}
void
vga_drawc(int c, int color)
{
int row;
int col;
vga_getpos(&row, &col);
VGA_SCREEN[row*VGA_TEXT_COLS + col] = (color << 8) | c;
}
void
vga_scroll(int color)
{
unsigned short val;
int i;
val = (color << 8) | ' ';
for (i = 0; i < (VGA_TEXT_ROWS-1)*VGA_TEXT_COLS; i++) {
VGA_SCREEN[i] = VGA_SCREEN[i + VGA_TEXT_COLS];
}
for (; i < VGA_TEXT_ROWS * VGA_TEXT_COLS; i++) {
VGA_SCREEN[i] = val;
}
}
void
vga_setpos(int row, int col)
{
int off;
off = row * VGA_TEXT_COLS + col;
vga_set_crtc(VGA_CRTC_CLAH, off >> 8);
vga_set_crtc(VGA_CRTC_CLAL, off & 0xff);
}
void
vga_getpos(int *row, int *col)
{
int off;
off = (vga_get_crtc(VGA_CRTC_CLAH) << 8) + vga_get_crtc(VGA_CRTC_CLAL);
*row = off / VGA_TEXT_COLS;
*col = off % VGA_TEXT_COLS;
}
static void
vga_set_crtc(int index, unsigned char val)
{
outb(VGA_COLOR_CRTC_INDEX, index);
outb(VGA_COLOR_CRTC_DATA, val);
}
static unsigned char
vga_get_crtc(int index)
{
outb(VGA_COLOR_CRTC_INDEX, index);
return (inb(VGA_COLOR_CRTC_DATA));
}
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