Annotation of prex/sys/arch/i386/pc/diag.c, Revision 1.1
1.1 ! nbrk 1: /*-
! 2: * Copyright (c) 2005-2007, Kohsuke Ohtani
! 3: * All rights reserved.
! 4: *
! 5: * Redistribution and use in source and binary forms, with or without
! 6: * modification, are permitted provided that the following conditions
! 7: * are met:
! 8: * 1. Redistributions of source code must retain the above copyright
! 9: * notice, this list of conditions and the following disclaimer.
! 10: * 2. Redistributions in binary form must reproduce the above copyright
! 11: * notice, this list of conditions and the following disclaimer in the
! 12: * documentation and/or other materials provided with the distribution.
! 13: * 3. Neither the name of the author nor the names of any co-contributors
! 14: * may be used to endorse or promote products derived from this software
! 15: * without specific prior written permission.
! 16: *
! 17: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
! 18: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 19: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 20: * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
! 21: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 22: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 23: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 24: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 25: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 26: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 27: * SUCH DAMAGE.
! 28: */
! 29:
! 30: /*
! 31: * diag.c - diagnostic message support
! 32: */
! 33:
! 34: #include <kernel.h>
! 35: #include <page.h>
! 36: #include <cpu.h>
! 37: #include <locore.h>
! 38:
! 39: #ifdef DEBUG
! 40: #ifdef CONFIG_DIAG_SCREEN
! 41:
! 42: #define VID_ATTR 0x0F00
! 43: #define VID_PORT 0x03d4
! 44: #define VID_RAM 0xB8000
! 45:
! 46: /* Screen info */
! 47: static short *vram;
! 48: static int pos_x;
! 49: static int pos_y;
! 50: static int screen_x;
! 51: static int screen_y;
! 52:
! 53: static void
! 54: screen_scrollup(void)
! 55: {
! 56: int i;
! 57:
! 58: memcpy(vram, vram + screen_x, (size_t)(screen_x * (screen_y - 1) * 2));
! 59: for (i = 0; i < screen_x; i++)
! 60: vram[screen_x * (screen_y - 1) + i] = ' ';
! 61: }
! 62:
! 63: static void
! 64: screen_update(void)
! 65: {
! 66: int pos = pos_y * screen_x + pos_x;
! 67:
! 68: outb(0x0e, VID_PORT);
! 69: outb((u_int)pos >> 8, VID_PORT + 1);
! 70:
! 71: outb(0x0f, VID_PORT);
! 72: outb((u_int)pos & 0xff, VID_PORT + 1);
! 73: }
! 74:
! 75: static void
! 76: screen_newline(void)
! 77: {
! 78:
! 79: pos_x = 0;
! 80: pos_y++;
! 81: if (pos_y >= screen_y) {
! 82: pos_y = screen_y - 1;
! 83: screen_scrollup();
! 84: }
! 85: screen_update();
! 86: }
! 87:
! 88: static void
! 89: screen_putchar(char c)
! 90: {
! 91:
! 92: switch (c) {
! 93: case '\n':
! 94: screen_newline();
! 95: return;
! 96: case '\r':
! 97: pos_x = 0;
! 98: screen_update();
! 99: return;
! 100: case '\b':
! 101: if (pos_x == 0)
! 102: return;
! 103: pos_x--;
! 104: screen_update();
! 105: return;
! 106: }
! 107: vram[pos_y * screen_x + pos_x] = c | VID_ATTR;
! 108: pos_x++;
! 109: if (pos_x >= screen_x) {
! 110: pos_x = 0;
! 111: pos_y++;
! 112: if (pos_y >= screen_y) {
! 113: pos_y = screen_y - 1;
! 114: screen_scrollup();
! 115: }
! 116: }
! 117: screen_update();
! 118: }
! 119:
! 120: static int
! 121: screen_init(void)
! 122: {
! 123:
! 124: vram = (short *)phys_to_virt(VID_RAM);
! 125: pos_x = 0;
! 126: pos_y = 0;
! 127: screen_x = boot_info->video.text_x;
! 128: screen_y = boot_info->video.text_y;
! 129: return 0;
! 130: }
! 131: #endif /* CONFIG_DIAG_SCREEN */
! 132:
! 133:
! 134: #ifdef CONFIG_DIAG_BOCHS
! 135: static void
! 136: bochs_putchar(char c)
! 137: {
! 138: /*
! 139: * Bochs debug port
! 140: */
! 141: if (inb(0xe9) == 0xe9)
! 142: outb((u_char)c, 0xe9);
! 143: }
! 144: #endif /* CONFIG_DIAG_BOCHS */
! 145:
! 146: void
! 147: diag_print(char *buf)
! 148: {
! 149:
! 150: while (*buf) {
! 151: #ifdef CONFIG_DIAG_SCREEN
! 152: screen_putchar(*buf);
! 153: #endif
! 154: #ifdef CONFIG_DIAG_BOCHS
! 155: bochs_putchar(*buf);
! 156: #endif
! 157: ++buf;
! 158: }
! 159: }
! 160: #endif /* DEBUG */
! 161:
! 162: void
! 163: diag_init(void)
! 164: {
! 165: #if defined(DEBUG) && defined(CONFIG_DIAG_SCREEN)
! 166: screen_init();
! 167: #endif
! 168: }
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