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| Rev | Author | Line No. | Line |
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| 2064 | vana | 1 | /* |
| 2071 | jermar | 2 | * Copyright (c) 2001-2004 Jakub Jermar |
| 2064 | vana | 3 | * All rights reserved. |
| 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 | /** @addtogroup ia32 |
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| 30 | * @{ |
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| 31 | */ |
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| 32 | /** |
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| 33 | * @file |
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| 34 | * @brief EGA driver. |
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| 35 | */ |
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| 36 | |||
| 37 | #include <putchar.h> |
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| 38 | #include <mm/page.h> |
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| 39 | #include <mm/as.h> |
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| 40 | #include <arch/mm/page.h> |
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| 41 | #include <synch/spinlock.h> |
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| 42 | #include <arch/types.h> |
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| 43 | #include <arch/asm.h> |
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| 44 | #include <memstr.h> |
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| 45 | #include <console/chardev.h> |
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| 46 | #include <console/console.h> |
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| 47 | #include <sysinfo/sysinfo.h> |
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| 2110 | jermar | 48 | #include <arch/drivers/ega.h> |
| 2064 | vana | 49 | |
| 50 | /* |
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| 51 | * The EGA driver. |
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| 52 | * Simple and short. Function for displaying characters and "scrolling". |
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| 53 | */ |
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| 54 | |||
| 55 | SPINLOCK_INITIALIZE(egalock); |
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| 56 | static uint32_t ega_cursor; |
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| 57 | static uint8_t *videoram; |
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| 58 | |||
| 59 | static void ega_putchar(chardev_t *d, const char ch); |
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| 60 | |||
| 61 | chardev_t ega_console; |
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| 62 | static chardev_operations_t ega_ops = { |
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| 63 | .write = ega_putchar |
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| 64 | }; |
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| 65 | |||
| 66 | |||
| 67 | void ega_init(void) |
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| 68 | { |
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| 69 | videoram = (uint8_t *) (VIDEORAM); |
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| 70 | |||
| 2110 | jermar | 71 | /* |
| 72 | * Clear the screen. |
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| 73 | */ |
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| 3104 | svoboda | 74 | _memsetw(videoram, SCREEN, 0x0720); |
| 2110 | jermar | 75 | |
| 2064 | vana | 76 | chardev_initialize("ega_out", &ega_console, &ega_ops); |
| 77 | stdout = &ega_console; |
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| 78 | |||
| 79 | sysinfo_set_item_val("fb", NULL, true); |
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| 80 | sysinfo_set_item_val("fb.kind", NULL, 2); |
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| 81 | sysinfo_set_item_val("fb.width", NULL, ROW); |
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| 82 | sysinfo_set_item_val("fb.height", NULL, ROWS); |
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| 83 | sysinfo_set_item_val("fb.address.physical", NULL, VIDEORAM); |
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| 84 | |||
| 85 | #ifndef CONFIG_FB |
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| 86 | putchar('\n'); |
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| 87 | #endif |
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| 88 | } |
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| 89 | |||
| 90 | static void ega_display_char(char ch) |
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| 91 | { |
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| 92 | videoram[ega_cursor * 2] = ch; |
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| 2110 | jermar | 93 | videoram[ega_cursor * 2 + 1] = 7; |
| 2064 | vana | 94 | } |
| 95 | |||
| 96 | /* |
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| 97 | * This function takes care of scrolling. |
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| 98 | */ |
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| 99 | static void ega_check_cursor(void) |
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| 100 | { |
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| 101 | if (ega_cursor < SCREEN) |
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| 102 | return; |
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| 103 | |||
| 104 | memcpy((void *) videoram, (void *) (videoram + ROW * 2), (SCREEN - ROW) * 2); |
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| 3104 | svoboda | 105 | _memsetw(videoram + (SCREEN - ROW) * 2, ROW, 0x0720); |
| 2064 | vana | 106 | ega_cursor = ega_cursor - ROW; |
| 107 | } |
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| 108 | |||
| 109 | void ega_putchar(chardev_t *d, const char ch) |
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| 110 | { |
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| 111 | ipl_t ipl; |
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| 112 | |||
| 113 | ipl = interrupts_disable(); |
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| 114 | spinlock_lock(&egalock); |
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| 115 | |||
| 116 | switch (ch) { |
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| 2065 | jermar | 117 | case '\n': |
| 118 | ega_cursor = (ega_cursor + ROW) - ega_cursor % ROW; |
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| 119 | break; |
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| 120 | case '\t': |
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| 121 | ega_cursor = (ega_cursor + 8) - ega_cursor % 8; |
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| 122 | break; |
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| 123 | case '\b': |
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| 124 | if (ega_cursor % ROW) |
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| 125 | ega_cursor--; |
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| 126 | break; |
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| 127 | default: |
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| 128 | ega_display_char(ch); |
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| 129 | ega_cursor++; |
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| 130 | break; |
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| 2064 | vana | 131 | } |
| 132 | ega_check_cursor(); |
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| 133 | |||
| 134 | spinlock_unlock(&egalock); |
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| 135 | interrupts_restore(ipl); |
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| 136 | } |
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| 137 | |||
| 138 | /** @} |
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| 139 | */ |