x86, setup: "glove box" BIOS interrupts in the video code

[deliverable/linux.git] / arch / x86 / boot / video-vga.c

diff --git a/arch/x86/boot/video-vga.c b/arch/x86/boot/video-vga.c
index 9e0587a3776868e73b62b7def725997b6ffb7699..8f8d827e254d0b8cb392bf7fe95103059ac5ca89 100644 (file)
--- a/arch/x86/boot/video-vga.c
+++ b/arch/x86/boot/video-vga.c
@@ -2,6 +2,7 @@
  *
  *   Copyright (C) 1991, 1992 Linus Torvalds
  *   Copyright 2007 rPath, Inc. - All Rights Reserved
+ *   Copyright 2009 Intel Corporation; author H. Peter Anvin
  *
  *   This file is part of the Linux kernel, and is made available under
  *   the terms of the GNU General Public License version 2.
@@ -39,30 +40,30 @@ static __videocard video_vga;
 /* Set basic 80x25 mode */
 static u8 vga_set_basic_mode(void)
 {
+       struct biosregs ireg, oreg;
        u16 ax;
        u8 rows;
        u8 mode;
 
+       initregs(&ireg);
+
 #ifdef CONFIG_VIDEO_400_HACK
        if (adapter >= ADAPTER_VGA) {
-               asm volatile(INT10
-                            : : "a" (0x1202), "b" (0x0030)
-                            : "ecx", "edx", "esi", "edi");
+               ireg.ax = 0x1202;
+               ireg.bx = 0x0030;
+               intcall(0x10, &ireg, NULL);
        }
 #endif
 
        ax = 0x0f00;
-       asm volatile(INT10
-                    : "+a" (ax)
-                    : : "ebx", "ecx", "edx", "esi", "edi");
-
-       mode = (u8)ax;
+       intcall(0x10, &ireg, &oreg);
+       mode = oreg.al;
 
        set_fs(0);
        rows = rdfs8(0x484);    /* rows minus one */
 
 #ifndef CONFIG_VIDEO_400_HACK
-       if ((ax == 0x5003 || ax == 0x5007) &&
+       if ((oreg.ax == 0x5003 || oreg.ax == 0x5007) &&
            (rows == 0 || rows == 24))
                return mode;
 #endif
@@ -71,10 +72,8 @@ static u8 vga_set_basic_mode(void)
                mode = 3;
 
        /* Set the mode */
-       ax = mode;
-       asm volatile(INT10
-                    : "+a" (ax)
-                    : : "ebx", "ecx", "edx", "esi", "edi");
+       ireg.ax = mode;         /* AH=0: set mode */
+       intcall(0x10, &ireg, NULL);
        do_restore = 1;
        return mode;
 }
@@ -82,43 +81,69 @@ static u8 vga_set_basic_mode(void)
 static void vga_set_8font(void)
 {
        /* Set 8x8 font - 80x43 on EGA, 80x50 on VGA */
+       struct biosregs ireg;
+
+       initregs(&ireg);
 
        /* Set 8x8 font */
-       asm volatile(INT10 : : "a" (0x1112), "b" (0));
+       ireg.ax = 0x1112;
+       /* ireg.bl = 0; */
+       intcall(0x10, &ireg, NULL);
 
        /* Use alternate print screen */
-       asm volatile(INT10 : : "a" (0x1200), "b" (0x20));
+       ireg.ax = 0x1200;
+       ireg.bl = 0x20;
+       intcall(0x10, &ireg, NULL);
 
        /* Turn off cursor emulation */
-       asm volatile(INT10 : : "a" (0x1201), "b" (0x34));
+       ireg.ax = 0x1201;
+       ireg.bl = 0x34;
+       intcall(0x10, &ireg, NULL);
 
        /* Cursor is scan lines 6-7 */
-       asm volatile(INT10 : : "a" (0x0100), "c" (0x0607));
+       ireg.ax = 0x0100;
+       ireg.cx = 0x0607;
+       intcall(0x10, &ireg, NULL);
 }
 
 static void vga_set_14font(void)
 {
        /* Set 9x14 font - 80x28 on VGA */
+       struct biosregs ireg;
+
+       initregs(&ireg);
 
        /* Set 9x14 font */
-       asm volatile(INT10 : : "a" (0x1111), "b" (0));
+       ireg.ax = 0x1111;
+       /* ireg.bl = 0; */
+       intcall(0x10, &ireg, NULL);
 
        /* Turn off cursor emulation */
-       asm volatile(INT10 : : "a" (0x1201), "b" (0x34));
+       ireg.ax = 0x1201;
+       ireg.bl = 0x34;
+       intcall(0x10, &ireg, NULL);
 
        /* Cursor is scan lines 11-12 */
-       asm volatile(INT10 : : "a" (0x0100), "c" (0x0b0c));
+       ireg.ax = 0x0100;
+       ireg.cx = 0x0b0c;
+       intcall(0x10, &ireg, NULL);
 }
 
 static void vga_set_80x43(void)
 {
        /* Set 80x43 mode on VGA (not EGA) */
+       struct biosregs ireg;
+
+       initregs(&ireg);
 
        /* Set 350 scans */
-       asm volatile(INT10 : : "a" (0x1201), "b" (0x30));
+       ireg.ax = 0x1201;
+       ireg.bl = 0x30;
+       intcall(0x10, &ireg, NULL);
 
        /* Reset video mode */
-       asm volatile(INT10 : : "a" (0x0003));
+       ireg.ax = 0x0003;
+       intcall(0x10, &ireg, NULL);
 
        vga_set_8font();
 }
@@ -225,8 +250,6 @@ static int vga_set_mode(struct mode_info *mode)
  */
 static int vga_probe(void)
 {
-       u16 ega_bx;
-
        static const char *card_name[] = {
                "CGA/MDA/HGC", "EGA", "VGA"
        };
@@ -240,26 +263,26 @@ static int vga_probe(void)
                sizeof(ega_modes)/sizeof(struct mode_info),
                sizeof(vga_modes)/sizeof(struct mode_info),
        };
-       u8 vga_flag;
 
-       asm(INT10
-           : "=b" (ega_bx)
-           : "a" (0x1200), "b" (0x10) /* Check EGA/VGA */
-           : "ecx", "edx", "esi", "edi");
+       struct biosregs ireg, oreg;
+
+       initregs(&ireg);
+
+       ireg.ax = 0x1200;
+       ireg.bl = 0x10;         /* Check EGA/VGA */
+       intcall(0x10, &ireg, &oreg);
 
 #ifndef _WAKEUP
-       boot_params.screen_info.orig_video_ega_bx = ega_bx;
+       boot_params.screen_info.orig_video_ega_bx = oreg.bx;
 #endif
 
        /* If we have MDA/CGA/HGC then BL will be unchanged at 0x10 */
-       if ((u8)ega_bx != 0x10) {
+       if (oreg.bl != 0x10) {
                /* EGA/VGA */
-               asm(INT10
-                   : "=a" (vga_flag)
-                   : "a" (0x1a00)
-                   : "ebx", "ecx", "edx", "esi", "edi");
+               ireg.ax = 0x1a00;
+               intcall(0x10, &ireg, &oreg);
 
-               if (vga_flag == 0x1a) {
+               if (oreg.al == 0x1a) {
                        adapter = ADAPTER_VGA;
 #ifndef _WAKEUP
                        boot_params.screen_info.orig_video_isVGA = 1;