vga_subr.c revision 1.6
1 /* $NetBSD: vga_subr.c,v 1.6 2000/01/25 02:44:03 ad Exp $ */ 2 3 /* 4 * Copyright (c) 1998 5 * Matthias Drochner. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed for the NetBSD Project 18 * by Matthias Drochner. 19 * 4. The name of the author may not be used to endorse or promote products 20 * derived from this software without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 * 33 */ 34 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/device.h> 38 #include <sys/queue.h> 39 #include <machine/bus.h> 40 41 #include <dev/ic/mc6845reg.h> 42 #include <dev/ic/pcdisplayvar.h> 43 #include <dev/ic/vgareg.h> 44 #include <dev/ic/vgavar.h> 45 46 #include <dev/wscons/wsdisplayvar.h> 47 48 static void fontram __P((struct vga_handle *)); 49 static void textram __P((struct vga_handle *)); 50 51 static void 52 fontram(vh) 53 struct vga_handle *vh; 54 { 55 /* program sequencer to access character generator */ 56 57 vga_ts_write(vh, syncreset, 0x01); /* synchronous reset */ 58 vga_ts_write(vh, wrplmask, 0x04); /* write to map 2 */ 59 vga_ts_write(vh, memmode, 0x07); /* sequential addressing */ 60 vga_ts_write(vh, syncreset, 0x03); /* clear synchronous reset */ 61 62 /* program graphics controller to access character generator */ 63 64 vga_gdc_write(vh, rdplanesel, 0x02); /* select map 2 for cpu reads */ 65 vga_gdc_write(vh, mode, 0x00); /* disable odd-even addressing */ 66 vga_gdc_write(vh, misc, 0x04); /* map starts at 0xA000 */ 67 } 68 69 static void 70 textram(vh) 71 struct vga_handle *vh; 72 { 73 /* program sequencer to access video ram */ 74 75 vga_ts_write(vh, syncreset, 0x01); /* synchronous reset */ 76 vga_ts_write(vh, wrplmask, 0x03); /* write to map 0 & 1 */ 77 vga_ts_write(vh, memmode, 0x03); /* odd-even addressing */ 78 vga_ts_write(vh, syncreset, 0x03); /* clear synchronous reset */ 79 80 /* program graphics controller for text mode */ 81 82 vga_gdc_write(vh, rdplanesel, 0x00); /* select map 0 for cpu reads */ 83 vga_gdc_write(vh, mode, 0x10); /* enable odd-even addressing */ 84 /* map starts at 0xb800 or 0xb000 (mono) */ 85 vga_gdc_write(vh, misc, (vh->vh_mono ? 0x0a : 0x0e)); 86 } 87 88 void 89 vga_loadchars(vh, fontset, first, num, lpc, data) 90 struct vga_handle *vh; 91 int fontset, first, num; 92 int lpc; 93 char *data; 94 { 95 int offset, i, j, s; 96 97 /* fontset number swizzle done in vga_setfontset() */ 98 offset = (fontset << 13) | (first << 5); 99 100 s = splhigh(); 101 fontram(vh); 102 103 for (i = 0; i < num; i++) 104 for (j = 0; j < lpc; j++) 105 bus_space_write_1(vh->vh_memt, vh->vh_allmemh, 106 offset + (i << 5) + j, 107 data[i * lpc + j]); 108 109 textram(vh); 110 splx(s); 111 } 112 113 void 114 vga_setfontset(vh, fontset1, fontset2) 115 struct vga_handle *vh; 116 int fontset1, fontset2; 117 { 118 u_int8_t cmap; 119 static u_int8_t cmaptaba[] = { 120 0x00, 0x10, 0x01, 0x11, 121 0x02, 0x12, 0x03, 0x13 122 }; 123 static u_int8_t cmaptabb[] = { 124 0x00, 0x20, 0x04, 0x24, 125 0x08, 0x28, 0x0c, 0x2c 126 }; 127 128 /* extended font if fontset1 != fontset2 */ 129 cmap = cmaptaba[fontset1] | cmaptabb[fontset2]; 130 131 vga_ts_write(vh, fontsel, cmap); 132 } 133 134 void 135 vga_setscreentype(vh, type) 136 struct vga_handle *vh; 137 const struct wsscreen_descr *type; 138 { 139 vga_6845_write(vh, maxrow, type->fontheight - 1); 140 141 /* lo byte */ 142 vga_6845_write(vh, vde, type->fontheight * type->nrows - 1); 143 144 #ifndef PCDISPLAY_SOFTCURSOR 145 /* set cursor to last 2 lines */ 146 vga_6845_write(vh, curstart, type->fontheight - 2); 147 vga_6845_write(vh, curend, type->fontheight - 1); 148 #endif 149 /* 150 * disable colour plane 3 if needed for font selection 151 */ 152 if (type->capabilities & WSSCREEN_HILIT) { 153 /* 154 * these are the screens which don't support 155 * 512-character fonts 156 */ 157 vga_attr_write(vh, colplen, 0x0f); 158 } else 159 vga_attr_write(vh, colplen, 0x07); 160 } 161
Indexes created Tue Sep 23 07:09:52 GMT 2025