0,0 → 1,201 |
/* |
* Copyright (c) 2001-2004 Jakub Jermar |
* All rights reserved. |
* |
* Redistribution and use in source and binary forms, with or without |
* modification, are permitted provided that the following conditions |
* are met: |
* |
* - Redistributions of source code must retain the above copyright |
* notice, this list of conditions and the following disclaimer. |
* - 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. |
* - 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 ``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 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. |
*/ |
|
/** @addtogroup genarch_drivers |
* @{ |
*/ |
/** |
* @file |
* @brief EGA driver. |
*/ |
|
#include <genarch/drivers/ega/ega.h> |
#include <putchar.h> |
#include <mm/page.h> |
#include <mm/as.h> |
#include <mm/slab.h> |
#include <arch/mm/page.h> |
#include <synch/spinlock.h> |
#include <arch/types.h> |
#include <arch/asm.h> |
#include <memstr.h> |
#include <console/chardev.h> |
#include <console/console.h> |
#include <sysinfo/sysinfo.h> |
#include <ddi/ddi.h> |
|
/* |
* The EGA driver. |
* Simple and short. Function for displaying characters and "scrolling". |
*/ |
|
SPINLOCK_INITIALIZE(egalock); |
static uint32_t ega_cursor; |
static uint8_t *videoram; |
static uint8_t *backbuf; |
static ioport8_t *ega_base; |
|
#define EMPTY_CHAR 0x0720 |
|
chardev_t ega_console; |
|
/* |
* This function takes care of scrolling. |
*/ |
static void ega_check_cursor(void) |
{ |
if (ega_cursor < EGA_SCREEN) |
return; |
|
memmove((void *) videoram, (void *) (videoram + EGA_COLS * 2), |
(EGA_SCREEN - EGA_COLS) * 2); |
memmove((void *) backbuf, (void *) (backbuf + EGA_COLS * 2), |
(EGA_SCREEN - EGA_COLS) * 2); |
memsetw(videoram + (EGA_SCREEN - EGA_COLS) * 2, EGA_COLS, EMPTY_CHAR); |
memsetw(backbuf + (EGA_SCREEN - EGA_COLS) * 2, EGA_COLS, EMPTY_CHAR); |
ega_cursor = ega_cursor - EGA_COLS; |
} |
|
static void ega_show_cursor(void) |
{ |
pio_write_8(ega_base + EGA_INDEX_REG, 0x0a); |
uint8_t stat = pio_read_8(ega_base + EGA_DATA_REG); |
pio_write_8(ega_base + EGA_INDEX_REG, 0x0a); |
pio_write_8(ega_base + EGA_DATA_REG, stat & (~(1 << 5))); |
} |
|
static void ega_move_cursor(void) |
{ |
pio_write_8(ega_base + EGA_INDEX_REG, 0x0e); |
pio_write_8(ega_base + EGA_DATA_REG, (uint8_t) ((ega_cursor >> 8) & 0xff)); |
pio_write_8(ega_base + EGA_INDEX_REG, 0x0f); |
pio_write_8(ega_base + EGA_DATA_REG, (uint8_t) (ega_cursor & 0xff)); |
} |
|
static void ega_sync_cursor(void) |
{ |
pio_write_8(ega_base + EGA_INDEX_REG, 0x0e); |
uint8_t hi = pio_read_8(ega_base + EGA_DATA_REG); |
pio_write_8(ega_base + EGA_INDEX_REG, 0x0f); |
uint8_t lo = pio_read_8(ega_base + EGA_DATA_REG); |
|
ega_cursor = (hi << 8) | lo; |
|
if (ega_cursor >= EGA_SCREEN) |
ega_cursor = 0; |
|
if ((ega_cursor % EGA_COLS) != 0) |
ega_cursor = (ega_cursor + EGA_COLS) - ega_cursor % EGA_COLS; |
|
memsetw(videoram + ega_cursor * 2, EGA_SCREEN - ega_cursor, EMPTY_CHAR); |
memsetw(backbuf + ega_cursor * 2, EGA_SCREEN - ega_cursor, EMPTY_CHAR); |
|
ega_check_cursor(); |
ega_move_cursor(); |
ega_show_cursor(); |
} |
|
static void ega_display_char(char ch, bool silent) |
{ |
backbuf[ega_cursor * 2] = ch; |
|
if (!silent) |
videoram[ega_cursor * 2] = ch; |
} |
|
static void ega_putchar(chardev_t *dev __attribute__((unused)), const char ch, bool silent) |
{ |
ipl_t ipl; |
|
ipl = interrupts_disable(); |
spinlock_lock(&egalock); |
|
switch (ch) { |
case '\n': |
ega_cursor = (ega_cursor + EGA_COLS) - ega_cursor % EGA_COLS; |
break; |
case '\t': |
ega_cursor = (ega_cursor + 8) - ega_cursor % 8; |
break; |
case '\b': |
if (ega_cursor % EGA_COLS) |
ega_cursor--; |
break; |
default: |
ega_display_char(ch, silent); |
ega_cursor++; |
break; |
} |
ega_check_cursor(); |
|
if (!silent) |
ega_move_cursor(); |
|
spinlock_unlock(&egalock); |
interrupts_restore(ipl); |
} |
|
static chardev_operations_t ega_ops = { |
.write = ega_putchar |
}; |
|
void ega_init(ioport8_t *base, uintptr_t videoram_phys) |
{ |
/* Initialize the software structure. */ |
ega_base = base; |
|
backbuf = (uint8_t *) malloc(EGA_VRAM_SIZE, 0); |
if (!backbuf) |
panic("Unable to allocate backbuffer."); |
|
videoram = (uint8_t *) hw_map(videoram_phys, EGA_VRAM_SIZE); |
|
/* Synchronize the back buffer and cursor position. */ |
memcpy(backbuf, videoram, EGA_VRAM_SIZE); |
ega_sync_cursor(); |
|
chardev_initialize("ega_out", &ega_console, &ega_ops); |
stdout = &ega_console; |
|
sysinfo_set_item_val("fb", NULL, true); |
sysinfo_set_item_val("fb.kind", NULL, 2); |
sysinfo_set_item_val("fb.width", NULL, EGA_COLS); |
sysinfo_set_item_val("fb.height", NULL, EGA_ROWS); |
sysinfo_set_item_val("fb.blinking", NULL, true); |
sysinfo_set_item_val("fb.address.physical", NULL, videoram_phys); |
} |
|
void ega_redraw(void) |
{ |
memcpy(videoram, backbuf, EGA_VRAM_SIZE); |
ega_move_cursor(); |
ega_show_cursor(); |
} |
|
/** @} |
*/ |
Property changes: |
Added: svn:mergeinfo |