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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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| 167 | jermar | 32 | #include <arch/mm/page.h> |
| 1 | jermar | 33 | #include <synch/spinlock.h> |
| 34 | #include <arch/types.h> |
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| 35 | #include <arch/asm.h> |
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| 195 | vana | 36 | #include <memstr.h> |
| 575 | palkovsky | 37 | #include <console/chardev.h> |
| 38 | #include <console/console.h> |
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| 1 | jermar | 39 | |
| 40 | /* |
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| 41 | * The EGA driver. |
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| 42 | * Simple and short. Function for displaying characters and "scrolling". |
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| 43 | */ |
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| 44 | |||
| 45 | static spinlock_t egalock; |
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| 46 | static __u32 ega_cursor; |
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| 47 | |||
| 575 | palkovsky | 48 | static void ega_putchar(chardev_t *d, const char ch); |
| 49 | |||
| 50 | chardev_t ega_console; |
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| 51 | static chardev_operations_t ega_ops = { |
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| 52 | .write = ega_putchar |
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| 53 | }; |
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| 54 | |||
| 1 | jermar | 55 | void ega_move_cursor(void); |
| 56 | |||
| 57 | void ega_init(void) |
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| 58 | { |
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| 59 | __u8 hi, lo; |
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| 60 | |||
| 492 | jermar | 61 | page_mapping_insert(PA2KA(VIDEORAM), VIDEORAM, PAGE_NOT_CACHEABLE, 0); |
| 1 | jermar | 62 | outb(0x3d4,0xe); |
| 63 | hi = inb(0x3d5); |
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| 64 | outb(0x3d4,0xf); |
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| 65 | lo = inb(0x3d5); |
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| 66 | ega_cursor = (hi<<8)|lo; |
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| 575 | palkovsky | 67 | |
| 68 | chardev_initialize("ega_out", &ega_console, &ega_ops); |
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| 69 | stdout = &ega_console; |
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| 70 | |||
| 71 | putchar('\n'); |
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| 1 | jermar | 72 | } |
| 73 | |||
| 452 | decky | 74 | static void ega_display_char(char ch) |
| 1 | jermar | 75 | { |
| 106 | jermar | 76 | __u8 *vram = (__u8 *) PA2KA(VIDEORAM); |
| 1 | jermar | 77 | |
| 78 | vram[ega_cursor*2] = ch; |
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| 79 | } |
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| 80 | |||
| 81 | /* |
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| 82 | * This function takes care of scrolling. |
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| 83 | */ |
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| 452 | decky | 84 | static void ega_check_cursor(void) |
| 1 | jermar | 85 | { |
| 86 | if (ega_cursor < SCREEN) |
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| 125 | jermar | 87 | return; |
| 1 | jermar | 88 | |
| 205 | jermar | 89 | memcpy((void *)PA2KA(VIDEORAM), (void *)(PA2KA(VIDEORAM) + ROW*2), (SCREEN - ROW)*2); |
| 106 | jermar | 90 | memsetw(PA2KA(VIDEORAM) + (SCREEN - ROW)*2, ROW, 0x0720); |
| 1 | jermar | 91 | ega_cursor = ega_cursor - ROW; |
| 92 | } |
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| 93 | |||
| 575 | palkovsky | 94 | void ega_putchar(chardev_t *d, const char ch) |
| 1 | jermar | 95 | { |
| 413 | jermar | 96 | ipl_t ipl; |
| 1 | jermar | 97 | |
| 413 | jermar | 98 | ipl = interrupts_disable(); |
| 1 | jermar | 99 | spinlock_lock(&egalock); |
| 100 | |||
| 101 | switch (ch) { |
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| 102 | case '\n': |
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| 125 | jermar | 103 | ega_cursor = (ega_cursor + ROW) - ega_cursor % ROW; |
| 104 | break; |
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| 1 | jermar | 105 | case '\t': |
| 125 | jermar | 106 | ega_cursor = (ega_cursor + 8) - ega_cursor % 8; |
| 107 | break; |
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| 1 | jermar | 108 | default: |
| 125 | jermar | 109 | ega_display_char(ch); |
| 110 | ega_cursor++; |
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| 111 | break; |
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| 1 | jermar | 112 | } |
| 113 | ega_check_cursor(); |
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| 114 | ega_move_cursor(); |
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| 125 | jermar | 115 | |
| 1 | jermar | 116 | spinlock_unlock(&egalock); |
| 413 | jermar | 117 | interrupts_restore(ipl); |
| 1 | jermar | 118 | } |
| 119 | |||
| 120 | void ega_move_cursor(void) |
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| 121 | { |
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| 122 | outb(0x3d4,0xe); |
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| 123 | outb(0x3d5,(ega_cursor>>8)&0xff); |
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| 124 | outb(0x3d4,0xf); |
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| 125 | outb(0x3d5,ega_cursor&0xff); |
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| 126 | } |