summaryrefslogtreecommitdiff
path: root/arch/x86/boot/video.h
diff options
context:
space:
mode:
authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /arch/x86/boot/video.h
Initial import
Diffstat (limited to 'arch/x86/boot/video.h')
-rw-r--r--arch/x86/boot/video.h120
1 files changed, 120 insertions, 0 deletions
diff --git a/arch/x86/boot/video.h b/arch/x86/boot/video.h
new file mode 100644
index 000000000..b54e0328c
--- /dev/null
+++ b/arch/x86/boot/video.h
@@ -0,0 +1,120 @@
+/* -*- 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.
+ *
+ * ----------------------------------------------------------------------- */
+
+/*
+ * Header file for the real-mode video probing code
+ */
+
+#ifndef BOOT_VIDEO_H
+#define BOOT_VIDEO_H
+
+#include <linux/types.h>
+
+/*
+ * 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
+
+void store_screen(void);
+#define DO_STORE() store_screen()
+
+/*
+ * Mode table structures
+ */
+
+struct mode_info {
+ u16 mode; /* Mode number (vga= style) */
+ u16 x, y; /* Width, height */
+ u16 depth; /* Bits per pixel, 0 for text mode */
+};
+
+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__((used,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 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 */
+
+/* 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 */