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[/] [or1k_soc_on_altera_embedded_dev_kit/] [trunk/] [linux-2.6/] [linux-2.6.24/] [arch/] [x86/] [boot/] [video.h] - Rev 3
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/* -*- 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.h * * Header file for the real-mode video probing code */ #ifndef BOOT_VIDEO_H #define BOOT_VIDEO_H #include <linux/types.h> /* Enable autodetection of SVGA adapters and modes. */ #undef CONFIG_VIDEO_SVGA /* Enable autodetection of VESA modes */ #define CONFIG_VIDEO_VESA /* Retain screen contents when switching modes */ #define CONFIG_VIDEO_RETAIN /* Force 400 scan lines for standard modes (hack to fix bad BIOS behaviour */ #undef CONFIG_VIDEO_400_HACK /* This code uses an extended set of video mode numbers. These include: * Aliases for standard modes * NORMAL_VGA (-1) * EXTENDED_VGA (-2) * ASK_VGA (-3) * Video modes numbered by menu position -- NOT RECOMMENDED because of lack * of compatibility when extending the table. These are between 0x00 and 0xff. */ #define VIDEO_FIRST_MENU 0x0000 /* Standard BIOS video modes (BIOS number + 0x0100) */ #define VIDEO_FIRST_BIOS 0x0100 /* VESA BIOS video modes (VESA number + 0x0200) */ #define VIDEO_FIRST_VESA 0x0200 /* Video7 special modes (BIOS number + 0x0900) */ #define VIDEO_FIRST_V7 0x0900 /* Special video modes */ #define VIDEO_FIRST_SPECIAL 0x0f00 #define VIDEO_80x25 0x0f00 #define VIDEO_8POINT 0x0f01 #define VIDEO_80x43 0x0f02 #define VIDEO_80x28 0x0f03 #define VIDEO_CURRENT_MODE 0x0f04 #define VIDEO_80x30 0x0f05 #define VIDEO_80x34 0x0f06 #define VIDEO_80x60 0x0f07 #define VIDEO_GFX_HACK 0x0f08 #define VIDEO_LAST_SPECIAL 0x0f09 /* Video modes given by resolution */ #define VIDEO_FIRST_RESOLUTION 0x1000 /* The "recalculate timings" flag */ #define VIDEO_RECALC 0x8000 /* Define DO_STORE according to CONFIG_VIDEO_RETAIN */ #ifdef CONFIG_VIDEO_RETAIN void store_screen(void); #define DO_STORE() store_screen() #else #define DO_STORE() ((void)0) #endif /* CONFIG_VIDEO_RETAIN */ /* * Mode table structures */ struct mode_info { u16 mode; /* Mode number (vga= style) */ u8 x, y; /* Width, height */ }; struct card_info { const char *card_name; int (*set_mode)(struct mode_info *mode); int (*probe)(void); struct mode_info *modes; int nmodes; /* Number of probed modes so far */ int unsafe; /* Probing is unsafe, only do after "scan" */ u16 xmode_first; /* Unprobed modes to try to call anyway */ u16 xmode_n; /* Size of unprobed mode range */ }; #define __videocard struct card_info __attribute__((section(".videocards"))) extern struct card_info video_cards[], video_cards_end[]; int mode_defined(u16 mode); /* video.c */ /* Basic video information */ #define ADAPTER_CGA 0 /* CGA/MDA/HGC */ #define ADAPTER_EGA 1 #define ADAPTER_VGA 2 extern int adapter; extern u16 video_segment; extern int force_x, force_y; /* Don't query the BIOS for cols/rows */ extern int do_restore; /* Restore screen contents */ extern int graphic_mode; /* Graphics mode with linear frame buffer */ /* * int $0x10 is notorious for touching registers it shouldn't. * gcc doesn't like %ebp being clobbered, so define it as a push/pop * sequence here. * * A number of systems, including the original PC can clobber %bp in * certain circumstances, like when scrolling. There exists at least * one Trident video card which could clobber DS under a set of * circumstances that we are unlikely to encounter (scrolling when * using an extended graphics mode of more than 800x600 pixels), but * it's cheap insurance to deal with that here. */ #define INT10 "pushl %%ebp; pushw %%ds; int $0x10; popw %%ds; popl %%ebp" /* Accessing VGA indexed registers */ static inline u8 in_idx(u16 port, u8 index) { outb(index, port); return inb(port+1); } static inline void out_idx(u8 v, u16 port, u8 index) { outw(index+(v << 8), port); } /* Writes a value to an indexed port and then reads the port again */ static inline u8 tst_idx(u8 v, u16 port, u8 index) { out_idx(port, index, v); return in_idx(port, index); } /* Get the I/O port of the VGA CRTC */ u16 vga_crtc(void); /* video-vga.c */ #endif /* BOOT_VIDEO_H */