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1 | jermar | 1 | /* |
2071 | jermar | 2 | * Copyright (c) 2001-2004 Jakub Jermar |
1 | jermar | 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 | |||
1754 | jermar | 29 | /** @addtogroup ia32 |
1702 | cejka | 30 | * @{ |
31 | */ |
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1754 | jermar | 32 | /** |
33 | * @file |
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34 | * @brief EGA driver. |
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1702 | cejka | 35 | */ |
36 | |||
1473 | decky | 37 | #include <arch/drivers/ega.h> |
1 | jermar | 38 | #include <putchar.h> |
39 | #include <mm/page.h> |
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755 | jermar | 40 | #include <mm/as.h> |
3751 | svoboda | 41 | #include <mm/slab.h> |
167 | jermar | 42 | #include <arch/mm/page.h> |
1 | jermar | 43 | #include <synch/spinlock.h> |
44 | #include <arch/types.h> |
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45 | #include <arch/asm.h> |
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195 | vana | 46 | #include <memstr.h> |
575 | palkovsky | 47 | #include <console/chardev.h> |
48 | #include <console/console.h> |
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1473 | decky | 49 | #include <sysinfo/sysinfo.h> |
2015 | jermar | 50 | #include <ddi/ddi.h> |
1 | jermar | 51 | |
52 | /* |
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53 | * The EGA driver. |
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54 | * Simple and short. Function for displaying characters and "scrolling". |
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55 | */ |
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56 | |||
2015 | jermar | 57 | static parea_t ega_parea; /**< Physical memory area for EGA video RAM. */ |
58 | |||
623 | jermar | 59 | SPINLOCK_INITIALIZE(egalock); |
1780 | jermar | 60 | static uint32_t ega_cursor; |
61 | static uint8_t *videoram; |
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3751 | svoboda | 62 | static uint8_t *backbuf; |
1 | jermar | 63 | |
575 | palkovsky | 64 | static void ega_putchar(chardev_t *d, const char ch); |
65 | |||
66 | chardev_t ega_console; |
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67 | static chardev_operations_t ega_ops = { |
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68 | .write = ega_putchar |
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69 | }; |
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70 | |||
2439 | decky | 71 | static void ega_move_cursor(void); |
1 | jermar | 72 | |
73 | void ega_init(void) |
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74 | { |
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1780 | jermar | 75 | uint8_t hi, lo; |
3751 | svoboda | 76 | |
77 | backbuf = (uint8_t *) malloc(SCREEN * 2, 0); |
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78 | if (!backbuf) |
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79 | panic("Unable to allocate backbuffer.\n"); |
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1473 | decky | 80 | |
1780 | jermar | 81 | videoram = (uint8_t *) hw_map(VIDEORAM, SCREEN * 2); |
1473 | decky | 82 | outb(0x3d4, 0xe); |
1 | jermar | 83 | hi = inb(0x3d5); |
1473 | decky | 84 | outb(0x3d4, 0xf); |
1 | jermar | 85 | lo = inb(0x3d5); |
1473 | decky | 86 | ega_cursor = (hi << 8) | lo; |
575 | palkovsky | 87 | |
88 | chardev_initialize("ega_out", &ega_console, &ega_ops); |
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89 | stdout = &ega_console; |
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1473 | decky | 90 | |
2015 | jermar | 91 | ega_parea.pbase = VIDEORAM; |
92 | ega_parea.vbase = (uintptr_t) videoram; |
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93 | ega_parea.frames = 1; |
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94 | ega_parea.cacheable = false; |
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95 | ddi_parea_register(&ega_parea); |
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96 | |||
1473 | decky | 97 | sysinfo_set_item_val("fb", NULL, true); |
98 | sysinfo_set_item_val("fb.kind", NULL, 2); |
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99 | sysinfo_set_item_val("fb.width", NULL, ROW); |
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100 | sysinfo_set_item_val("fb.height", NULL, ROWS); |
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101 | sysinfo_set_item_val("fb.address.physical", NULL, VIDEORAM); |
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1 | jermar | 102 | } |
103 | |||
452 | decky | 104 | static void ega_display_char(char ch) |
1 | jermar | 105 | { |
1473 | decky | 106 | videoram[ega_cursor * 2] = ch; |
3751 | svoboda | 107 | backbuf[ega_cursor * 2] = ch; |
1 | jermar | 108 | } |
109 | |||
110 | /* |
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111 | * This function takes care of scrolling. |
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112 | */ |
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452 | decky | 113 | static void ega_check_cursor(void) |
1 | jermar | 114 | { |
115 | if (ega_cursor < SCREEN) |
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125 | jermar | 116 | return; |
1 | jermar | 117 | |
3751 | svoboda | 118 | memmove((void *) videoram, (void *) (videoram + ROW * 2), (SCREEN - ROW) * 2); |
119 | memmove((void *) backbuf, (void *) (backbuf + ROW * 2), (SCREEN - ROW) * 2); |
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3104 | svoboda | 120 | memsetw(videoram + (SCREEN - ROW) * 2, ROW, 0x0720); |
3751 | svoboda | 121 | memsetw(backbuf + (SCREEN - ROW) * 2, ROW, 0x0720); |
1 | jermar | 122 | ega_cursor = ega_cursor - ROW; |
123 | } |
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124 | |||
2439 | decky | 125 | void ega_putchar(chardev_t *d __attribute__((unused)), const char ch) |
1 | jermar | 126 | { |
413 | jermar | 127 | ipl_t ipl; |
1 | jermar | 128 | |
413 | jermar | 129 | ipl = interrupts_disable(); |
1 | jermar | 130 | spinlock_lock(&egalock); |
131 | |||
132 | switch (ch) { |
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2065 | jermar | 133 | case '\n': |
134 | ega_cursor = (ega_cursor + ROW) - ega_cursor % ROW; |
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135 | break; |
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136 | case '\t': |
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137 | ega_cursor = (ega_cursor + 8) - ega_cursor % 8; |
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138 | break; |
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139 | case '\b': |
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140 | if (ega_cursor % ROW) |
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141 | ega_cursor--; |
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142 | break; |
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143 | default: |
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144 | ega_display_char(ch); |
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145 | ega_cursor++; |
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146 | break; |
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1473 | decky | 147 | } |
1 | jermar | 148 | ega_check_cursor(); |
149 | ega_move_cursor(); |
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125 | jermar | 150 | |
1 | jermar | 151 | spinlock_unlock(&egalock); |
413 | jermar | 152 | interrupts_restore(ipl); |
1 | jermar | 153 | } |
154 | |||
155 | void ega_move_cursor(void) |
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156 | { |
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1473 | decky | 157 | outb(0x3d4, 0xe); |
2439 | decky | 158 | outb(0x3d5, (uint8_t) ((ega_cursor >> 8) & 0xff)); |
1473 | decky | 159 | outb(0x3d4, 0xf); |
2439 | decky | 160 | outb(0x3d5, (uint8_t) (ega_cursor & 0xff)); |
1 | jermar | 161 | } |
1702 | cejka | 162 | |
3751 | svoboda | 163 | void ega_redraw(void) |
164 | { |
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165 | memcpy(videoram, backbuf, SCREEN * 2); |
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166 | ega_move_cursor(); |
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167 | } |
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168 | |||
1754 | jermar | 169 | /** @} |
1702 | cejka | 170 | */ |