| 1 | /*
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| 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 |
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| 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 |
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| 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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| 48 | #include <arch/drivers/ega.h>
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| 49 |
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| 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 |
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| 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 |
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| 59 | static void ega_putchar(chardev_t *d, const char ch);
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| 60 |
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| 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 |
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| 66 |
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| 67 | void ega_init(void)
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| 68 | {
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| 69 | videoram = (uint8_t *) (VIDEORAM);
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| 70 |
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| 71 | /*
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| 72 | * Clear the screen.
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| 73 | */
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| 74 | _memsetw((uintptr_t) videoram, SCREEN, 0x0720);
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| 75 |
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| 76 | chardev_initialize("ega_out", &ega_console, &ega_ops);
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| 77 | stdout = &ega_console;
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| 78 |
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| 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 |
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| 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 |
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| 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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| 93 | videoram[ega_cursor * 2 + 1] = 7;
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| 94 | }
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| 95 |
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| 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 |
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| 104 | memcpy((void *) videoram, (void *) (videoram + ROW * 2), (SCREEN - ROW) * 2);
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| 105 | _memsetw((uintptr_t) (videoram + (SCREEN - ROW) * 2), ROW, 0x0720);
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| 106 | ega_cursor = ega_cursor - ROW;
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| 107 | }
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| 108 |
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| 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 |
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| 113 | ipl = interrupts_disable();
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| 114 | spinlock_lock(&egalock);
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| 115 |
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| 116 | switch (ch) {
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| 117 | case '\n':
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| 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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| 131 | }
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| 132 | ega_check_cursor();
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| 133 |
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| 134 | spinlock_unlock(&egalock);
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| 135 | interrupts_restore(ipl);
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| 136 | }
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| 137 |
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| 138 | /** @}
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| 139 | */
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