diff options
Diffstat (limited to 'arch/i386/boot/video-bios.c')
-rw-r--r-- | arch/i386/boot/video-bios.c | 125 |
1 files changed, 0 insertions, 125 deletions
diff --git a/arch/i386/boot/video-bios.c b/arch/i386/boot/video-bios.c deleted file mode 100644 index 68e65d95cdfd..000000000000 --- a/arch/i386/boot/video-bios.c +++ /dev/null @@ -1,125 +0,0 @@ -/* -*- linux-c -*- ------------------------------------------------------- * - * - * Copyright (C) 1991, 1992 Linus Torvalds - * Copyright 2007 rPath, Inc. - All Rights Reserved - * - * This file is part of the Linux kernel, and is made available under - * the terms of the GNU General Public License version 2. - * - * ----------------------------------------------------------------------- */ - -/* - * arch/i386/boot/video-bios.c - * - * Standard video BIOS modes - * - * We have two options for this; silent and scanned. - */ - -#include "boot.h" -#include "video.h" - -__videocard video_bios; - -/* Set a conventional BIOS mode */ -static int set_bios_mode(u8 mode); - -static int bios_set_mode(struct mode_info *mi) -{ - return set_bios_mode(mi->mode - VIDEO_FIRST_BIOS); -} - -static int set_bios_mode(u8 mode) -{ - u16 ax; - u8 new_mode; - - ax = mode; /* AH=0x00 Set Video Mode */ - asm volatile(INT10 - : "+a" (ax) - : : "ebx", "ecx", "edx", "esi", "edi"); - - ax = 0x0f00; /* Get Current Video Mode */ - asm volatile(INT10 - : "+a" (ax) - : : "ebx", "ecx", "edx", "esi", "edi"); - - do_restore = 1; /* Assume video contents were lost */ - new_mode = ax & 0x7f; /* Not all BIOSes are clean with the top bit */ - - if (new_mode == mode) - return 0; /* Mode change OK */ - - if (new_mode != boot_params.screen_info.orig_video_mode) { - /* Mode setting failed, but we didn't end up where we - started. That's bad. Try to revert to the original - video mode. */ - ax = boot_params.screen_info.orig_video_mode; - asm volatile(INT10 - : "+a" (ax) - : : "ebx", "ecx", "edx", "esi", "edi"); - } - return -1; -} - -static int bios_probe(void) -{ - u8 mode; - u8 saved_mode = boot_params.screen_info.orig_video_mode; - u16 crtc; - struct mode_info *mi; - int nmodes = 0; - - if (adapter != ADAPTER_EGA && adapter != ADAPTER_VGA) - return 0; - - set_fs(0); - crtc = vga_crtc(); - - video_bios.modes = GET_HEAP(struct mode_info, 0); - - for (mode = 0x14; mode <= 0x7f; mode++) { - if (heap_free() < sizeof(struct mode_info)) - break; - - if (mode_defined(VIDEO_FIRST_BIOS+mode)) - continue; - - if (set_bios_mode(mode)) - continue; - - /* Try to verify that it's a text mode. */ - - /* Attribute Controller: make graphics controller disabled */ - if (in_idx(0x3c0, 0x10) & 0x01) - continue; - - /* Graphics Controller: verify Alpha addressing enabled */ - if (in_idx(0x3ce, 0x06) & 0x01) - continue; - - /* CRTC cursor location low should be zero(?) */ - if (in_idx(crtc, 0x0f)) - continue; - - mi = GET_HEAP(struct mode_info, 1); - mi->mode = VIDEO_FIRST_BIOS+mode; - mi->x = rdfs16(0x44a); - mi->y = rdfs8(0x484)+1; - nmodes++; - } - - set_bios_mode(saved_mode); - - return nmodes; -} - -__videocard video_bios = -{ - .card_name = "BIOS (scanned)", - .probe = bios_probe, - .set_mode = bios_set_mode, - .unsafe = 1, - .xmode_first = VIDEO_FIRST_BIOS, - .xmode_n = 0x80, -}; |