| 0,0 → 1,118 |
|---|
| /* |
| * 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. |
| */ |
| |
| #include <arch/ega.h> |
| #include <putchar.h> |
| #include <mm/page.h> |
| #include <arch/mm/page.h> |
| #include <synch/spinlock.h> |
| #include <arch/types.h> |
| #include <arch/asm.h> |
| #include <memstr.h> |
| |
| /* |
| * The EGA driver. |
| * Simple and short. Function for displaying characters and "scrolling". |
| */ |
| |
| static spinlock_t egalock; |
| static __u32 ega_cursor; |
| |
| void ega_move_cursor(void); |
| |
| void ega_init(void) |
| { |
| __u8 hi, lo; |
| |
| page_mapping_insert(PA2KA(VIDEORAM), VIDEORAM, PAGE_NOT_CACHEABLE, 0); |
| outb(0x3d4,0xe); |
| hi = inb(0x3d5); |
| outb(0x3d4,0xf); |
| lo = inb(0x3d5); |
| ega_cursor = (hi<<8)|lo; |
| ega_putchar('\n'); |
| } |
| |
| static void ega_display_char(char ch) |
| { |
| __u8 *vram = (__u8 *) PA2KA(VIDEORAM); |
| |
| vram[ega_cursor*2] = ch; |
| } |
| |
| /* |
| * This function takes care of scrolling. |
| */ |
| static void ega_check_cursor(void) |
| { |
| if (ega_cursor < SCREEN) |
| return; |
| |
| memcpy((void *)PA2KA(VIDEORAM), (void *)(PA2KA(VIDEORAM) + ROW*2), (SCREEN - ROW)*2); |
| memsetw(PA2KA(VIDEORAM) + (SCREEN - ROW)*2, ROW, 0x0720); |
| ega_cursor = ega_cursor - ROW; |
| } |
| |
| void ega_putchar(const char ch) |
| { |
| ipl_t ipl; |
| |
| ipl = interrupts_disable(); |
| spinlock_lock(&egalock); |
| |
| switch (ch) { |
| case '\n': |
| ega_cursor = (ega_cursor + ROW) - ega_cursor % ROW; |
| break; |
| case '\t': |
| ega_cursor = (ega_cursor + 8) - ega_cursor % 8; |
| break; |
| default: |
| ega_display_char(ch); |
| ega_cursor++; |
| break; |
| } |
| ega_check_cursor(); |
| ega_move_cursor(); |
| |
| spinlock_unlock(&egalock); |
| interrupts_restore(ipl); |
| } |
| |
| void ega_move_cursor(void) |
| { |
| outb(0x3d4,0xe); |
| outb(0x3d5,(ega_cursor>>8)&0xff); |
| outb(0x3d4,0xf); |
| outb(0x3d5,ega_cursor&0xff); |
| } |
| |
| void putchar(const char ch) |
| { |
| ega_putchar(ch); |
| } |