1 files changed, 261 insertions, 0 deletions

diff --git a/arch/x86/boot/video-vga.c b/arch/x86/boot/video-vga.c
new file mode 100644
index 000000000000..aef02f9ec0c1
--- /dev/null
+++ b/arch/x86/boot/video-vga.c
@@ -0,0 +1,261 @@
+/* -*- 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-vga.c
+ *
+ * Common all-VGA modes
+ */
+
+#include "boot.h"
+#include "video.h"
+
+static struct mode_info vga_modes[] = {
+        { VIDEO_80x25,  80, 25 },
+        { VIDEO_8POINT, 80, 50 },
+        { VIDEO_80x43,  80, 43 },
+        { VIDEO_80x28,  80, 28 },
+        { VIDEO_80x30,  80, 30 },
+        { VIDEO_80x34,  80, 34 },
+        { VIDEO_80x60,  80, 60 },
+};
+
+static struct mode_info ega_modes[] = {
+        { VIDEO_80x25,  80, 25 },
+        { VIDEO_8POINT, 80, 43 },
+};
+
+static struct mode_info cga_modes[] = {
+        { VIDEO_80x25,  80, 25 },
+};
+
+__videocard video_vga;
+
+/* Set basic 80x25 mode */
+static u8 vga_set_basic_mode(void)
+{
+        u16 ax;
+        u8 rows;
+        u8 mode;
+
+#ifdef CONFIG_VIDEO_400_HACK
+        if (adapter >= ADAPTER_VGA) {
+                asm volatile(INT10
+                             : : "a" (0x1202), "b" (0x0030)
+                             : "ecx", "edx", "esi", "edi");
+        }
+#endif
+
+        ax = 0x0f00;
+        asm volatile(INT10
+                     : "+a" (ax)
+                     : : "ebx", "ecx", "edx", "esi", "edi");
+
+        mode = (u8)ax;
+
+        set_fs(0);
+        rows = rdfs8(0x484);    /* rows minus one */
+
+#ifndef CONFIG_VIDEO_400_HACK
+        if ((ax == 0x5003 || ax == 0x5007) &&
+            (rows == 0 || rows == 24))
+                return mode;
+#endif
+
+        if (mode != 3 && mode != 7)
+                mode = 3;
+
+        /* Set the mode */
+        ax = mode;
+        asm volatile(INT10
+                     : "+a" (ax)
+                     : : "ebx", "ecx", "edx", "esi", "edi");
+        do_restore = 1;
+        return mode;
+}
+
+static void vga_set_8font(void)
+{
+        /* Set 8x8 font - 80x43 on EGA, 80x50 on VGA */
+
+        /* Set 8x8 font */
+        asm volatile(INT10 : : "a" (0x1112), "b" (0));
+
+        /* Use alternate print screen */
+        asm volatile(INT10 : : "a" (0x1200), "b" (0x20));
+
+        /* Turn off cursor emulation */
+        asm volatile(INT10 : : "a" (0x1201), "b" (0x34));
+
+        /* Cursor is scan lines 6-7 */
+        asm volatile(INT10 : : "a" (0x0100), "c" (0x0607));
+}
+
+static void vga_set_14font(void)
+{
+        /* Set 9x14 font - 80x28 on VGA */
+
+        /* Set 9x14 font */
+        asm volatile(INT10 : : "a" (0x1111), "b" (0));
+
+        /* Turn off cursor emulation */
+        asm volatile(INT10 : : "a" (0x1201), "b" (0x34));
+
+        /* Cursor is scan lines 11-12 */
+        asm volatile(INT10 : : "a" (0x0100), "c" (0x0b0c));
+}
+
+static void vga_set_80x43(void)
+{
+        /* Set 80x43 mode on VGA (not EGA) */
+
+        /* Set 350 scans */
+        asm volatile(INT10 : : "a" (0x1201), "b" (0x30));
+
+        /* Reset video mode */
+        asm volatile(INT10 : : "a" (0x0003));
+
+        vga_set_8font();
+}
+
+/* I/O address of the VGA CRTC */
+u16 vga_crtc(void)
+{
+        return (inb(0x3cc) & 1) ? 0x3d4 : 0x3b4;
+}
+
+static void vga_set_480_scanlines(int end)
+{
+        u16 crtc;
+        u8  csel;
+
+        crtc = vga_crtc();
+
+        out_idx(0x0c, crtc, 0x11); /* Vertical sync end, unlock CR0-7 */
+        out_idx(0x0b, crtc, 0x06); /* Vertical total */
+        out_idx(0x3e, crtc, 0x07); /* Vertical overflow */
+        out_idx(0xea, crtc, 0x10); /* Vertical sync start */
+        out_idx(end, crtc, 0x12); /* Vertical display end */
+        out_idx(0xe7, crtc, 0x15); /* Vertical blank start */
+        out_idx(0x04, crtc, 0x16); /* Vertical blank end */
+        csel = inb(0x3cc);
+        csel &= 0x0d;
+        csel |= 0xe2;
+        outb(csel, 0x3cc);
+}
+
+static void vga_set_80x30(void)
+{
+        vga_set_480_scanlines(0xdf);
+}
+
+static void vga_set_80x34(void)
+{
+        vga_set_14font();
+        vga_set_480_scanlines(0xdb);
+}
+
+static void vga_set_80x60(void)
+{
+        vga_set_8font();
+        vga_set_480_scanlines(0xdf);
+}
+
+static int vga_set_mode(struct mode_info *mode)
+{
+        /* Set the basic mode */
+        vga_set_basic_mode();
+
+        /* Override a possibly broken BIOS */
+        force_x = mode->x;
+        force_y = mode->y;
+
+        switch (mode->mode) {
+        case VIDEO_80x25:
+                break;
+        case VIDEO_8POINT:
+                vga_set_8font();
+                break;
+        case VIDEO_80x43:
+                vga_set_80x43();
+                break;
+        case VIDEO_80x28:
+                vga_set_14font();
+                break;
+        case VIDEO_80x30:
+                vga_set_80x30();
+                break;
+        case VIDEO_80x34:
+                vga_set_80x34();
+                break;
+        case VIDEO_80x60:
+                vga_set_80x60();
+                break;
+        }
+
+        return 0;
+}
+
+/*
+ * Note: this probe includes basic information required by all
+ * systems.  It should be executed first, by making sure
+ * video-vga.c is listed first in the Makefile.
+ */
+static int vga_probe(void)
+{
+        static const char *card_name[] = {
+                "CGA/MDA/HGC", "EGA", "VGA"
+        };
+        static struct mode_info *mode_lists[] = {
+                cga_modes,
+                ega_modes,
+                vga_modes,
+        };
+        static int mode_count[] = {
+                sizeof(cga_modes)/sizeof(struct mode_info),
+                sizeof(ega_modes)/sizeof(struct mode_info),
+                sizeof(vga_modes)/sizeof(struct mode_info),
+        };
+        u8 vga_flag;
+
+        asm(INT10
+            : "=b" (boot_params.screen_info.orig_video_ega_bx)
+            : "a" (0x1200), "b" (0x10) /* Check EGA/VGA */
+            : "ecx", "edx", "esi", "edi");
+
+        /* If we have MDA/CGA/HGC then BL will be unchanged at 0x10 */
+        if ((u8)boot_params.screen_info.orig_video_ega_bx != 0x10) {
+                /* EGA/VGA */
+                asm(INT10
+                    : "=a" (vga_flag)
+                    : "a" (0x1a00)
+                    : "ebx", "ecx", "edx", "esi", "edi");
+
+                if (vga_flag == 0x1a) {
+                        adapter = ADAPTER_VGA;
+                        boot_params.screen_info.orig_video_isVGA = 1;
+                } else {
+                        adapter = ADAPTER_EGA;
+                }
+        } else {
+                adapter = ADAPTER_CGA;
+        }
+
+        video_vga.modes = mode_lists[adapter];
+        video_vga.card_name = card_name[adapter];
+        return mode_count[adapter];
+}
+
+__videocard video_vga =
+{
+        .card_name      = "VGA",
+        .probe          = vga_probe,
+        .set_mode       = vga_set_mode,
+};