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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 | |||
1473 | decky | 29 | #include <arch/drivers/ega.h> |
1 | jermar | 30 | #include <putchar.h> |
31 | #include <mm/page.h> |
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755 | jermar | 32 | #include <mm/as.h> |
167 | jermar | 33 | #include <arch/mm/page.h> |
1 | jermar | 34 | #include <synch/spinlock.h> |
35 | #include <arch/types.h> |
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36 | #include <arch/asm.h> |
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195 | vana | 37 | #include <memstr.h> |
575 | palkovsky | 38 | #include <console/chardev.h> |
39 | #include <console/console.h> |
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1473 | decky | 40 | #include <sysinfo/sysinfo.h> |
1 | jermar | 41 | |
42 | /* |
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43 | * The EGA driver. |
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44 | * Simple and short. Function for displaying characters and "scrolling". |
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45 | */ |
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46 | |||
623 | jermar | 47 | SPINLOCK_INITIALIZE(egalock); |
1 | jermar | 48 | static __u32 ega_cursor; |
1473 | decky | 49 | static __u8 *videoram; |
1 | jermar | 50 | |
575 | palkovsky | 51 | static void ega_putchar(chardev_t *d, const char ch); |
52 | |||
53 | chardev_t ega_console; |
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54 | static chardev_operations_t ega_ops = { |
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55 | .write = ega_putchar |
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56 | }; |
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57 | |||
1 | jermar | 58 | void ega_move_cursor(void); |
59 | |||
60 | void ega_init(void) |
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61 | { |
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62 | __u8 hi, lo; |
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1473 | decky | 63 | |
64 | videoram = (__u8 *) hw_map(VIDEORAM, SCREEN * 2); |
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65 | outb(0x3d4, 0xe); |
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1 | jermar | 66 | hi = inb(0x3d5); |
1473 | decky | 67 | outb(0x3d4, 0xf); |
1 | jermar | 68 | lo = inb(0x3d5); |
1473 | decky | 69 | ega_cursor = (hi << 8) | lo; |
575 | palkovsky | 70 | |
71 | chardev_initialize("ega_out", &ega_console, &ega_ops); |
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72 | stdout = &ega_console; |
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1473 | decky | 73 | |
74 | sysinfo_set_item_val("fb", NULL, true); |
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75 | sysinfo_set_item_val("fb.kind", NULL, 2); |
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76 | sysinfo_set_item_val("fb.width", NULL, ROW); |
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77 | sysinfo_set_item_val("fb.height", NULL, ROWS); |
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78 | sysinfo_set_item_val("fb.address.physical", NULL, VIDEORAM); |
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79 | |||
1296 | vana | 80 | #ifndef CONFIG_FB |
575 | palkovsky | 81 | putchar('\n'); |
1296 | vana | 82 | #endif |
1 | jermar | 83 | } |
84 | |||
452 | decky | 85 | static void ega_display_char(char ch) |
1 | jermar | 86 | { |
1473 | decky | 87 | videoram[ega_cursor * 2] = ch; |
1 | jermar | 88 | } |
89 | |||
90 | /* |
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91 | * This function takes care of scrolling. |
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92 | */ |
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452 | decky | 93 | static void ega_check_cursor(void) |
1 | jermar | 94 | { |
95 | if (ega_cursor < SCREEN) |
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125 | jermar | 96 | return; |
1 | jermar | 97 | |
1473 | decky | 98 | memcpy((void *) videoram, (void *) (videoram + ROW * 2), (SCREEN - ROW) * 2); |
99 | memsetw((__address) (videoram + (SCREEN - ROW) * 2), ROW, 0x0720); |
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1 | jermar | 100 | ega_cursor = ega_cursor - ROW; |
101 | } |
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102 | |||
575 | palkovsky | 103 | void ega_putchar(chardev_t *d, const char ch) |
1 | jermar | 104 | { |
413 | jermar | 105 | ipl_t ipl; |
1 | jermar | 106 | |
413 | jermar | 107 | ipl = interrupts_disable(); |
1 | jermar | 108 | spinlock_lock(&egalock); |
109 | |||
110 | switch (ch) { |
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1473 | decky | 111 | case '\n': |
112 | ega_cursor = (ega_cursor + ROW) - ega_cursor % ROW; |
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113 | break; |
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114 | case '\t': |
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115 | ega_cursor = (ega_cursor + 8) - ega_cursor % 8; |
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116 | break; |
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117 | case '\b': |
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118 | if (ega_cursor % ROW) |
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119 | ega_cursor--; |
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120 | break; |
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121 | default: |
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122 | ega_display_char(ch); |
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123 | ega_cursor++; |
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124 | break; |
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125 | } |
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1 | jermar | 126 | ega_check_cursor(); |
127 | ega_move_cursor(); |
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125 | jermar | 128 | |
1 | jermar | 129 | spinlock_unlock(&egalock); |
413 | jermar | 130 | interrupts_restore(ipl); |
1 | jermar | 131 | } |
132 | |||
133 | void ega_move_cursor(void) |
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134 | { |
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1473 | decky | 135 | outb(0x3d4, 0xe); |
136 | outb(0x3d5, (ega_cursor >> 8) & 0xff); |
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137 | outb(0x3d4, 0xf); |
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138 | outb(0x3d5, ega_cursor & 0xff); |
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1 | jermar | 139 | } |