1 files changed, 152 insertions, 0 deletions

diff --git a/arch/x86/boot/video.h b/arch/x86/boot/video.h
new file mode 100644
index 000000000000..b92447d51213
--- /dev/null
+++ b/arch/x86/boot/video.h
@@ -0,0 +1,152 @@
+/* -*- 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 */