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286 lines
5.5 KiB
286 lines
5.5 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* -*- linux-c -*- ------------------------------------------------------- * |
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* |
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* Copyright (C) 1991, 1992 Linus Torvalds |
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* Copyright 2007 rPath, Inc. - All Rights Reserved |
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* Copyright 2009 Intel Corporation; author H. Peter Anvin |
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* |
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* ----------------------------------------------------------------------- */ |
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/* |
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* Common all-VGA modes |
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*/ |
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#include "boot.h" |
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#include "video.h" |
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static struct mode_info vga_modes[] = { |
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{ VIDEO_80x25, 80, 25, 0 }, |
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{ VIDEO_8POINT, 80, 50, 0 }, |
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{ VIDEO_80x43, 80, 43, 0 }, |
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{ VIDEO_80x28, 80, 28, 0 }, |
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{ VIDEO_80x30, 80, 30, 0 }, |
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{ VIDEO_80x34, 80, 34, 0 }, |
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{ VIDEO_80x60, 80, 60, 0 }, |
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}; |
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static struct mode_info ega_modes[] = { |
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{ VIDEO_80x25, 80, 25, 0 }, |
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{ VIDEO_8POINT, 80, 43, 0 }, |
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}; |
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static struct mode_info cga_modes[] = { |
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{ VIDEO_80x25, 80, 25, 0 }, |
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}; |
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static __videocard video_vga; |
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/* Set basic 80x25 mode */ |
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static u8 vga_set_basic_mode(void) |
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{ |
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struct biosregs ireg, oreg; |
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u8 mode; |
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initregs(&ireg); |
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/* Query current mode */ |
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ireg.ax = 0x0f00; |
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intcall(0x10, &ireg, &oreg); |
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mode = oreg.al; |
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if (mode != 3 && mode != 7) |
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mode = 3; |
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/* Set the mode */ |
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ireg.ax = mode; /* AH=0: set mode */ |
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intcall(0x10, &ireg, NULL); |
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do_restore = 1; |
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return mode; |
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} |
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static void vga_set_8font(void) |
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{ |
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/* Set 8x8 font - 80x43 on EGA, 80x50 on VGA */ |
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struct biosregs ireg; |
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initregs(&ireg); |
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/* Set 8x8 font */ |
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ireg.ax = 0x1112; |
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/* ireg.bl = 0; */ |
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intcall(0x10, &ireg, NULL); |
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/* Use alternate print screen */ |
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ireg.ax = 0x1200; |
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ireg.bl = 0x20; |
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intcall(0x10, &ireg, NULL); |
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/* Turn off cursor emulation */ |
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ireg.ax = 0x1201; |
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ireg.bl = 0x34; |
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intcall(0x10, &ireg, NULL); |
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/* Cursor is scan lines 6-7 */ |
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ireg.ax = 0x0100; |
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ireg.cx = 0x0607; |
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intcall(0x10, &ireg, NULL); |
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} |
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static void vga_set_14font(void) |
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{ |
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/* Set 9x14 font - 80x28 on VGA */ |
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struct biosregs ireg; |
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initregs(&ireg); |
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/* Set 9x14 font */ |
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ireg.ax = 0x1111; |
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/* ireg.bl = 0; */ |
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intcall(0x10, &ireg, NULL); |
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/* Turn off cursor emulation */ |
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ireg.ax = 0x1201; |
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ireg.bl = 0x34; |
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intcall(0x10, &ireg, NULL); |
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/* Cursor is scan lines 11-12 */ |
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ireg.ax = 0x0100; |
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ireg.cx = 0x0b0c; |
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intcall(0x10, &ireg, NULL); |
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} |
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static void vga_set_80x43(void) |
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{ |
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/* Set 80x43 mode on VGA (not EGA) */ |
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struct biosregs ireg; |
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initregs(&ireg); |
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/* Set 350 scans */ |
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ireg.ax = 0x1201; |
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ireg.bl = 0x30; |
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intcall(0x10, &ireg, NULL); |
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/* Reset video mode */ |
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ireg.ax = 0x0003; |
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intcall(0x10, &ireg, NULL); |
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vga_set_8font(); |
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} |
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/* I/O address of the VGA CRTC */ |
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u16 vga_crtc(void) |
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{ |
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return (inb(0x3cc) & 1) ? 0x3d4 : 0x3b4; |
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} |
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static void vga_set_480_scanlines(void) |
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{ |
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u16 crtc; /* CRTC base address */ |
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u8 csel; /* CRTC miscellaneous output register */ |
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crtc = vga_crtc(); |
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out_idx(0x0c, crtc, 0x11); /* Vertical sync end, unlock CR0-7 */ |
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out_idx(0x0b, crtc, 0x06); /* Vertical total */ |
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out_idx(0x3e, crtc, 0x07); /* Vertical overflow */ |
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out_idx(0xea, crtc, 0x10); /* Vertical sync start */ |
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out_idx(0xdf, crtc, 0x12); /* Vertical display end */ |
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out_idx(0xe7, crtc, 0x15); /* Vertical blank start */ |
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out_idx(0x04, crtc, 0x16); /* Vertical blank end */ |
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csel = inb(0x3cc); |
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csel &= 0x0d; |
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csel |= 0xe2; |
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outb(csel, 0x3c2); |
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} |
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static void vga_set_vertical_end(int lines) |
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{ |
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u16 crtc; /* CRTC base address */ |
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u8 ovfw; /* CRTC overflow register */ |
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int end = lines-1; |
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crtc = vga_crtc(); |
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ovfw = 0x3c | ((end >> (8-1)) & 0x02) | ((end >> (9-6)) & 0x40); |
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out_idx(ovfw, crtc, 0x07); /* Vertical overflow */ |
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out_idx(end, crtc, 0x12); /* Vertical display end */ |
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} |
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static void vga_set_80x30(void) |
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{ |
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vga_set_480_scanlines(); |
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vga_set_vertical_end(30*16); |
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} |
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static void vga_set_80x34(void) |
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{ |
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vga_set_480_scanlines(); |
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vga_set_14font(); |
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vga_set_vertical_end(34*14); |
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} |
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static void vga_set_80x60(void) |
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{ |
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vga_set_480_scanlines(); |
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vga_set_8font(); |
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vga_set_vertical_end(60*8); |
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} |
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static int vga_set_mode(struct mode_info *mode) |
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{ |
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/* Set the basic mode */ |
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vga_set_basic_mode(); |
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/* Override a possibly broken BIOS */ |
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force_x = mode->x; |
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force_y = mode->y; |
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switch (mode->mode) { |
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case VIDEO_80x25: |
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break; |
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case VIDEO_8POINT: |
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vga_set_8font(); |
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break; |
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case VIDEO_80x43: |
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vga_set_80x43(); |
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break; |
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case VIDEO_80x28: |
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vga_set_14font(); |
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break; |
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case VIDEO_80x30: |
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vga_set_80x30(); |
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break; |
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case VIDEO_80x34: |
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vga_set_80x34(); |
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break; |
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case VIDEO_80x60: |
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vga_set_80x60(); |
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break; |
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} |
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return 0; |
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} |
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/* |
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* Note: this probe includes basic information required by all |
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* systems. It should be executed first, by making sure |
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* video-vga.c is listed first in the Makefile. |
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*/ |
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static int vga_probe(void) |
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{ |
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static const char *card_name[] = { |
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"CGA/MDA/HGC", "EGA", "VGA" |
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}; |
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static struct mode_info *mode_lists[] = { |
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cga_modes, |
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ega_modes, |
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vga_modes, |
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}; |
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static int mode_count[] = { |
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ARRAY_SIZE(cga_modes), |
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ARRAY_SIZE(ega_modes), |
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ARRAY_SIZE(vga_modes), |
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}; |
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struct biosregs ireg, oreg; |
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initregs(&ireg); |
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ireg.ax = 0x1200; |
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ireg.bl = 0x10; /* Check EGA/VGA */ |
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intcall(0x10, &ireg, &oreg); |
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#ifndef _WAKEUP |
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boot_params.screen_info.orig_video_ega_bx = oreg.bx; |
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#endif |
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/* If we have MDA/CGA/HGC then BL will be unchanged at 0x10 */ |
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if (oreg.bl != 0x10) { |
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/* EGA/VGA */ |
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ireg.ax = 0x1a00; |
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intcall(0x10, &ireg, &oreg); |
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if (oreg.al == 0x1a) { |
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adapter = ADAPTER_VGA; |
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#ifndef _WAKEUP |
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boot_params.screen_info.orig_video_isVGA = 1; |
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#endif |
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} else { |
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adapter = ADAPTER_EGA; |
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} |
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} else { |
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adapter = ADAPTER_CGA; |
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} |
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video_vga.modes = mode_lists[adapter]; |
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video_vga.card_name = card_name[adapter]; |
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return mode_count[adapter]; |
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} |
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static __videocard video_vga = { |
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.card_name = "VGA", |
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.probe = vga_probe, |
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.set_mode = vga_set_mode, |
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};
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