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| Rev | Author | Line No. | Line |
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| 1 | jermar | 1 | /* |
| 2 | * Copyright (C) 2001-2004 Jakub Jermar |
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| 3 | * All rights reserved. |
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| 4 | * |
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| 5 | * Redistribution and use in source and binary forms, with or without |
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| 6 | * modification, are permitted provided that the following conditions |
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| 7 | * are met: |
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| 8 | * |
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| 9 | * - Redistributions of source code must retain the above copyright |
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| 10 | * notice, this list of conditions and the following disclaimer. |
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| 11 | * - Redistributions in binary form must reproduce the above copyright |
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| 12 | * notice, this list of conditions and the following disclaimer in the |
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| 13 | * documentation and/or other materials provided with the distribution. |
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| 14 | * - The name of the author may not be used to endorse or promote products |
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| 15 | * derived from this software without specific prior written permission. |
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| 16 | * |
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 27 | */ |
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| 28 | |||
| 29 | #include <arch/ega.h> |
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| 30 | #include <putchar.h> |
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| 31 | #include <mm/page.h> |
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| 32 | #include <synch/spinlock.h> |
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| 33 | #include <arch/types.h> |
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| 34 | #include <arch/asm.h> |
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| 35 | |||
| 36 | /* |
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| 37 | * The EGA driver. |
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| 38 | * Simple and short. Function for displaying characters and "scrolling". |
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| 39 | */ |
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| 40 | |||
| 41 | static spinlock_t egalock; |
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| 42 | static __u32 ega_cursor; |
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| 43 | |||
| 44 | void ega_move_cursor(void); |
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| 45 | |||
| 46 | void ega_init(void) |
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| 47 | { |
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| 48 | __u8 hi, lo; |
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| 49 | |||
| 50 | map_page_to_frame(VIDEORAM, VIDEORAM, PAGE_NOT_CACHEABLE, 0); |
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| 51 | outb(0x3d4,0xe); |
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| 52 | hi = inb(0x3d5); |
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| 53 | outb(0x3d4,0xf); |
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| 54 | lo = inb(0x3d5); |
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| 55 | ega_cursor = (hi<<8)|lo; |
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| 56 | ega_putchar('\n'); |
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| 57 | } |
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| 58 | |||
| 59 | void ega_display_char(char ch) |
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| 60 | { |
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| 61 | __u8 *vram = (__u8 *) VIDEORAM; |
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| 62 | |||
| 63 | vram[ega_cursor*2] = ch; |
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| 64 | } |
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| 65 | |||
| 66 | /* |
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| 67 | * This function takes care of scrolling. |
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| 68 | */ |
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| 69 | void ega_check_cursor(void) |
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| 70 | { |
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| 71 | if (ega_cursor < SCREEN) |
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| 72 | return; |
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| 73 | |||
| 74 | memcopy(VIDEORAM + ROW*2, VIDEORAM, (SCREEN - ROW)*2); |
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| 75 | memsetw(VIDEORAM + (SCREEN - ROW)*2, ROW, 0x0720); |
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| 76 | ega_cursor = ega_cursor - ROW; |
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| 77 | } |
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| 78 | |||
| 79 | void ega_putchar(char ch) |
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| 80 | { |
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| 81 | pri_t pri; |
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| 82 | |||
| 83 | pri = cpu_priority_high(); |
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| 84 | spinlock_lock(&egalock); |
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| 85 | |||
| 86 | switch (ch) { |
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| 87 | case '\n': |
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| 88 | ega_cursor = (ega_cursor + ROW) - ega_cursor % ROW; |
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| 89 | break; |
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| 90 | case '\t': |
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| 91 | ega_cursor = (ega_cursor + 8) - ega_cursor % 8; |
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| 92 | break; |
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| 93 | default: |
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| 94 | ega_display_char(ch); |
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| 95 | ega_cursor++; |
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| 96 | break; |
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| 97 | } |
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| 98 | ega_check_cursor(); |
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| 99 | ega_move_cursor(); |
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| 100 | |||
| 101 | spinlock_unlock(&egalock); |
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| 102 | cpu_priority_restore(pri); |
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| 103 | } |
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| 104 | |||
| 105 | void ega_move_cursor(void) |
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| 106 | { |
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| 107 | outb(0x3d4,0xe); |
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| 108 | outb(0x3d5,(ega_cursor>>8)&0xff); |
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| 109 | outb(0x3d4,0xf); |
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| 110 | outb(0x3d5,ega_cursor&0xff); |
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| 111 | } |
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| 112 | |||
| 113 | void putchar(char ch) |
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| 114 | { |
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| 115 | ega_putchar(ch); |
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| 116 | } |