drop all duplicate copies of vgabios.c in favor

of devices/oprom/x86.c.

We have some tests on hardware. Moving RAMBASE to
1MB needs to wait a bit until C7 cache_as_ram.inc
has been adapted to cache that area or things will
become incredibly slow (1.5s boot time instead of 0.5)

Signed-off-by: Stefan Reinauer <stepan@coresystems.de>
Acked-by: Stefan Reinauer <stepan@coresystems.de>




git-svn-id: svn://svn.coreboot.org/coreboot/trunk@5488 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

4 files changed, 76 insertions, 798 deletions

diff --git a/src/northbridge/via/cx700/Kconfig b/src/northbridge/via/cx700/Kconfig
index 58e2047a14..916c4c3dc9 100644
--- a/src/northbridge/via/cx700/Kconfig
+++ b/src/northbridge/via/cx700/Kconfig
@@ -5,14 +5,35 @@ config NORTHBRIDGE_VIA_CX700
 	select IOAPIC
 	select SMP
 
-# this is done by the northbridge's vgabios.c already
-config VGA_ROM_RUN
-	bool
-	default n
+# TODO: What should be the per-chipset default value here?
+choice
+	prompt "Onboard graphics"
+	default CX700_VIDEO_MB_32MB
 	depends on NORTHBRIDGE_VIA_CX700
 
-config PCI_ROM_RUN
-	bool
-	default n
+# TODO: Setting the amount of gfx memory is not yet supported in the source code.
+config CX700_VIDEO_MB_OFF
+	bool "Disabled, 0KB"
+config CX700_VIDEO_MB_8MB
+	bool "Enabled, 8MB"
+config CX700_VIDEO_MB_16MB
+	bool "Enabled, 16MB"
+config CX700_VIDEO_MB_32MB
+	bool "Enabled, 32MB"
+config CX700_VIDEO_MB_64MB
+	bool "Enabled, 64MB"
+config CX700_VIDEO_MB_128MB
+	bool "Enabled, 128MB"
+
+endchoice
+
+config VIDEO_MB
+	int
+	default 0   if CX700_VIDEO_MB_OFF
+	default 8   if CX700_VIDEO_MB_8MB
+	default 16  if CX700_VIDEO_MB_16MB
+	default 32  if CX700_VIDEO_MB_32MB
+	default 64  if CX700_VIDEO_MB_64MB
+	default 128 if CX700_VIDEO_MB_128MB
 	depends on NORTHBRIDGE_VIA_CX700
 
diff --git a/src/northbridge/via/cx700/Makefile.inc b/src/northbridge/via/cx700/Makefile.inc
index 85e984a443..1221fd5f8b 100644
--- a/src/northbridge/via/cx700/Makefile.inc
+++ b/src/northbridge/via/cx700/Makefile.inc
@@ -19,7 +19,6 @@
 
 obj-y += cx700_reset.o
 obj-y += northbridge.o
-obj-y += vgabios.o
 
 driver-y += cx700_agp.o
 driver-y += cx700_lpc.o
diff --git a/src/northbridge/via/cx700/cx700_vga.c b/src/northbridge/via/cx700/cx700_vga.c
index c259b376ad..88fac179f2 100644
--- a/src/northbridge/via/cx700/cx700_vga.c
+++ b/src/northbridge/via/cx700/cx700_vga.c
@@ -29,6 +29,7 @@
 #include <cpu/cpu.h>
 #include <cpu/x86/mtrr.h>
 #include <cpu/x86/msr.h>
+#include <arch/interrupt.h>
 #include "chip.h"
 #include "northbridge.h"
 
@@ -41,9 +42,44 @@
 #define CRTC_INDEX	0x3d4
 #define CRTC_DATA	0x3d5
 
-void setup_realmode_idt(void);
-void do_vgabios(void);
-void vga_enable_console(void);
+static int via_cx700_int15_handler(struct eregs *regs)
+{
+	int res=-1;
+	printk(BIOS_DEBUG, "via_cx700_int15_handler\n");
+	switch(regs->eax & 0xffff) {
+	case 0x5f19:
+		break;
+	case 0x5f18:
+		regs->eax=0x5f;
+		regs->ebx=0x545; // MCLK = 133, 32M frame buffer, 256 M main memory
+		regs->ecx=0x060;
+		res=0;
+		break;
+	case 0x5f00:
+		regs->eax = 0x8600;
+		break;
+	case 0x5f01:
+		regs->eax = 0x5f;
+		regs->ecx = (regs->ecx & 0xffffff00 ) | 2; // panel type =  2 = 1024 * 768
+		res = 0;
+		break;
+	case 0x5f02:
+		regs->eax=0x5f;
+		regs->ebx= (regs->ebx & 0xffff0000) | 2;
+		regs->ecx= (regs->ecx & 0xffff0000) | 0x401;  // PAL + crt only 
+		regs->edx= (regs->edx & 0xffff0000) | 0;  // TV Layout - default
+		res=0;
+		break;
+	case 0x5f0f:
+		regs->eax=0x860f;
+		break;
+        default:
+		printk(BIOS_DEBUG, "Unknown INT15 function %04x!\n", 
+				regs->eax & 0xffff);
+		break;
+	}
+	return res;
+}
 
 void write_protect_vgabios(void)
 {
@@ -64,7 +100,7 @@ static void vga_init(device_t dev)
 {
 	u8 reg8;
 
-	printk(BIOS_DEBUG, "Initializing VGA...\n");
+	mainboard_interrupt_handlers(0x15, &via_cx700_int15_handler);
 
 	//*
 	pci_write_config8(dev, 0x04, 0x07);
@@ -75,12 +111,16 @@ static void vga_init(device_t dev)
 	pci_write_config8(dev, 0x3c, 0x0b);
 	//*/
 
-	printk(BIOS_DEBUG, "Executing VGA option rom in real mode\n");
-	setup_realmode_idt();
-	do_vgabios();
+	printk(BIOS_DEBUG, "Initializing VGA...\n");
+
+	pci_dev_init(dev);
+
 	printk(BIOS_DEBUG, "Enable VGA console\n");
+	// this is how it should look:
+	//   call_bios_interrupt(0x10,0x4f1f,0x8003,1,0);
+	// this is how it looks:
 	vga_enable_console();
-
+	
 	/* It's not clear if these need to be programmed before or after
 	 * the VGA bios runs. Try both, clean up later */
 	/* Set memory rate to 200MHz */
diff --git a/src/northbridge/via/cx700/vgabios.c b/src/northbridge/via/cx700/vgabios.c
deleted file mode 100644
index 59b3239204..0000000000
--- a/src/northbridge/via/cx700/vgabios.c
+++ /dev/null
@@ -1,782 +0,0 @@
-/*
- * This file is part of the coreboot project.
- *
- * (C) 2007-2009 coresystems GmbH
- * (See further copyright notices below)
- *
- * NOTE: This file is supposed to go away once the generic vm86 handler
- * in util/x86emu is able to handle intXX hooks like yabel does.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; version 2 of the License.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
- */
-
-#include <console/console.h>
-#include <device/pci.h>
-#include <device/pci_ids.h>
-#include <device/pci_ops.h>
-#undef __KERNEL__
-#include <arch/io.h>
-#include <string.h>
-#include <cbfs.h>
-
-void write_protect_vgabios(void);
-
-/* vgabios.c. Derived from: */
-
-/*------------------------------------------------------------ -*- C -*-
- *  2 Kernel Monte a.k.a. Linux loading Linux on x86
- *
- *  Erik Arjan Hendriks <hendriks@lanl.gov>
- *
- *  This version is a derivative of the original two kernel monte
- *  which is (C) 2000 Scyld.
- *
- *  Copyright (C) 2000 Scyld Computing Corporation
- *
- * Portions related to the alpha architecture are:
- *
- *  Copyright(C) 2001 University of California.  LA-CC Number 01-67.
- *  This software has been authored by an employee or employees of the
- *  University of California, operator of the Los Alamos National
- *  Laboratory under Contract No.  W-7405-ENG-36 with the U.S.
- *  Department of Energy.  The U.S. Government has rights to use,
- *  reproduce, and distribute this software. If the software is
- *  modified to produce derivative works, such modified software should
- *  be clearly marked, so as not to confuse it with the version
- *  available from LANL.
- *
- *  This software may be used and distributed according to the terms
- *  of the GNU General Public License, incorporated herein by
- *  reference to http://www.gnu.org/licenses/gpl.html.
- *
- *  This software is provided by the author(s) "as is" and any express
- *  or implied warranties, including, but not limited to, the implied
- *  warranties of merchantability and fitness for a particular purpose
- *  are disclaimed.  In no event shall the author(s) be liable for any
- *  direct, indirect, incidental, special, exemplary, or consequential
- *  damages (including, but not limited to, procurement of substitute
- *  goods or services; loss of use, data, or profits; or business
- *  interruption) however caused and on any theory of liability,
- *  whether in contract, strict liability, or tort (including
- *  negligence or otherwise) arising in any way out of the use of this
- *  software, even if advised of the possibility of such damage.
- *
- *--------------------------------------------------------------------*/
-
-/* Modified to be a self sufficient plug in so that it can be used 
-   without reliance on other parts of core Linuxbios 
-   (C) 2005 Nick.Barker9@btinternet.com
-
-  Used initially for epia-m where there are problems getting the bios
-  emulator to successfully run this bios.
-*/
-
-/* Declare a temporary global descriptor table - necessary because the
-   Core part of the bios no longer sets up any 16 bit segments */
-__asm__(
-	       /* pointer to original gdt */
-	       "gdtarg:			\n"
-	       "	.word	gdt_limit	\n"
-	       "	.long	gdt	       	\n"
-	       /* compute the table limit */
-	       "__mygdt_limit = __mygdt_end - __mygdt - 1	\n"
-	       "__mygdtaddr:			\n"
-	       "	.word	__mygdt_limit  	\n"
-	       "	.long	__mygdt	       	\n"
-	       "__mygdt: 		       	\n"
-	       /* selgdt 0, unused */
-	       "	.word	0x0000, 0x0000	\n"
-	       "	.byte	0x00, 0x00, 0x00, 0x00	\n"
-	       /* selgdt 8, unused */
-	       "	.word	0x0000, 0x0000	       	\n"
-	       "	.byte	0x00, 0x00, 0x00, 0x00	\n"
-	       /* selgdt 0x10, flat code segment */
-	       "	.word	0xffff, 0x0000	       	\n"
-	       "	.byte	0x00, 0x9b, 0xcf, 0x00	\n"
-	       /* selgdt 0x18, flat data segment */
-	       "	.word	0xffff, 0x0000	       	\n"
-	       "	.byte	0x00, 0x93, 0xcf, 0x00	\n"
-	       /* selgdt 0x20, unused */
-	       "	.word	0x0000, 0x0000	       	\n"
-	       "	.byte	0x00, 0x00, 0x00, 0x00	\n"
-	       /* selgdt 0x28 16-bit 64k code at 0x00000000 */
-	       "	.word	0xffff, 0x0000	       	\n"
-	       "	.byte	0, 0x9a, 0, 0	       	\n"
-	       /* selgdt 0x30 16-bit 64k data at 0x00000000 */
-	       "	.word	0xffff, 0x0000	       	\n"
-	       "	.byte	0, 0x92, 0, 0	       	\n"
-	       "__mygdt_end:				\n");
-
-/* Declare a pointer to where our idt is going to be i.e. at mem zero */
-__asm__("__myidt:		\n"
-	/* 16-bit limit */
-	"	.word 1023	\n"
-	/* 24-bit base */
-	"	.long 0		\n" "	.word 0		\n");
-
-/* The address arguments to this function are PHYSICAL ADDRESSES */
-static void real_mode_switch_call_vga(unsigned long devfn)
-{
-	__asm__ __volatile__(
-				    // paranoia -- does ecx get saved? not sure. This is 
-				    // the easiest safe thing to do.
-				    "	pushal			\n"
-				    /* save the stack */
-				    "	mov 	%esp, __stack	\n"
-				    "	jmp 	1f		\n"
-				    "__stack: .long 0		\n" "1:\n"
-				    /* get devfn into %ecx */
-				    "	movl    %esp, %ebp	\n"
-				    "	movl    8(%ebp), %ecx	\n"
-				    /* load 'our' gdt */
-				    "	lgdt	%cs:__mygdtaddr	\n"
-				    /*  This configures CS properly for real mode. */
-				    "	ljmp	$0x28, $__rms_16bit\n"
-				    "__rms_16bit:		  	\n"
-				    "	.code16			\n"
-				    /* 16 bit code from here on... */
-				    /* Load the segment registers w/ properly configured segment
-				     * descriptors.  They will retain these configurations (limits,
-				     * writability, etc.) once protected mode is turned off. */
-				    "	mov	$0x30, %ax	\n"
-				    "	mov	%ax, %ds       	\n"
-				    "	mov	%ax, %es       	\n"
-				    "	mov	%ax, %fs       	\n"
-				    "	mov	%ax, %gs       	\n"
-				    "	mov	%ax, %ss       	\n"
-				    /* Turn off protection (bit 0 in CR0) */
-				    "	movl	%cr0, %eax	\n"
-				    "	andl	$0xFFFFFFFE, %eax \n"
-				    "	movl	%eax, %cr0	\n"
-				    /* Now really going into real mode */
-				    "	ljmp	$0,  $__rms_real\n"
-				    "__rms_real:			\n"
-				    /* put the stack at the end of page zero. 
-				     * that way we can easily share it between real and protected, 
-				     * since the 16-bit ESP at segment 0 will work for any case. 
-				     */
-				    /* Setup a stack */
-				    "	mov	$0x0, %ax	\n"
-				    "	mov	%ax, %ss	\n"
-				    "	movl	$0x1000, %eax	\n"
-				    "	movl	%eax, %esp	\n"
-				    /* Load our 16 it idt */
-				    "	xor	%ax, %ax	\n"
-				    "	mov	%ax, %ds	\n"
-				    "	lidt	__myidt		\n"
-				    /* Dump zeros in the other segregs */
-				    "	mov	%ax, %es       	\n"
-				    "	mov	%ax, %fs       	\n"
-				    "	mov	%ax, %gs       	\n"
-				    "	mov	$0x40, %ax	\n"
-				    "	mov	%ax, %ds	\n"
-				    "	mov	%cx, %ax	\n"
-				    /* run VGA BIOS at 0xc000:0003 */
-				    "	lcall	$0xc000, $0x0003\n"
-				    /* if we got here, just about done. 
-				     * Need to get back to protected mode */
-				    "	movl	%cr0, %eax	\n" "	orl	$0x0000001, %eax\n"	/* PE = 1 */
-				    "	movl	%eax, %cr0	\n"
-				    /* Now that we are in protected mode jump to a 32 bit code segment. */
-				    "	data32	ljmp	$0x10, $vgarestart\n"
-				    "vgarestart:\n"
-				    "	.code32\n"
-				    "	movw	$0x18, %ax     	\n"
-				    "	mov	%ax, %ds       	\n"
-				    "	mov	%ax, %es	\n"
-				    "	mov	%ax, %fs	\n"
-				    "	mov	%ax, %gs	\n"
-				    "	mov	%ax, %ss	\n"
-				    /* restore proper gdt and idt */
-				    "	lgdt	%cs:gdtarg	\n"
-				    "	lidt	idtarg		\n"
-				    ".globl vga_exit		\n"
-				    "vga_exit:			\n"
-				    "	mov	__stack, %esp	\n"
-				    "	popal			\n");
-}
-
-__asm__(".text\n" "real_mode_switch_end:\n");
-extern char real_mode_switch_end[];
-
-/* call vga bios int 10 function 0x4f14 to enable main console 
-   epia-m does not always autosence the main console so forcing it on is good !! */
-void vga_enable_console(void)
-{
-	__asm__ __volatile__(
-				    /* paranoia -- does ecx get saved? not sure. This is 
-				     * the easiest safe thing to do. */
-				    "	pushal			\n"
-				    /* save the stack */
-				    "	mov	%esp, __stack	\n"
-				    /* load 'our' gdt */
-				    "	lgdt 	%cs:__mygdtaddr	\n"
-				    /*  This configures CS properly for real mode. */
-				    "	ljmp 	$0x28, $__vga_ec_16bit\n"
-				    "__vga_ec_16bit:		\n"
-				    "	.code16			\n"
-				    /* 16 bit code from here on... */
-				    /* Load the segment registers w/ properly configured segment
-				     * descriptors.  They will retain these configurations (limits,
-				     * writability, etc.) once protected mode is turned off. */
-				    "	mov	$0x30, %ax     	\n"
-				    "	mov	%ax, %ds       	\n"
-				    "	mov	%ax, %es       	\n"
-				    "	mov	%ax, %fs       	\n"
-				    "	mov	%ax, %gs       	\n"
-				    "	mov	%ax, %ss       	\n"
-				    /* Turn off protection (bit 0 in CR0) */
-				    "	movl	%cr0, %eax     	\n"
-				    "	andl	$0xFFFFFFFE, %eax\n"
-				    "	movl	%eax, %cr0     	\n"
-				    /* Now really going into real mode */
-				    "	ljmp	$0, $__vga_ec_real \n"
-				    "__vga_ec_real:                  \n"
-				    /* put the stack at the end of page zero. 
-				     * that way we can easily share it between real and protected, 
-				     * since the 16-bit ESP at segment 0 will work for any case. 
-				     */
-				    /* Setup a stack */
-				    "	mov	$0x0, %ax	\n"
-				    "	mov	%ax, %ss	\n"
-				    "	movl	$0x1000, %eax	\n"
-				    "	movl	%eax, %esp	\n"
-				    /* debugging for RGM */
-				    "	mov	$0x11, %al	\n"
-				    "	outb	%al, $0x80	\n"
-				    /* Load our 16 it idt */
-				    "	xor	%ax, %ax       	\n"
-				    "	mov	%ax, %ds	\n"
-				    "	lidt	__myidt		\n"
-				    /* Dump zeros in the other segregs */
-				    "	mov	%ax, %ds	\n"
-				    "	mov	%ax, %es	\n"
-				    "	mov	%ax, %fs	\n"
-				    "	mov	%ax, %gs	\n"
-				    /* ask bios to enable main console */
-				    /* set up for int 10 call - values found from X server
-				     * bios call routines */
-				    "	movw	$0x4f14,%ax	\n"
-				    "	movw	$0x8003,%bx	\n"
-				    "	movw	$1, %cx		\n"
-				    "	movw	$0, %dx		\n"
-				    "	movw	$0, %di		\n"
-				    "	int	$0x10		\n"
-				    "	movb	$0x55, %al	\n"
-				    "	outb	%al, $0x80	\n"
-				    /* if we got here, just about done. 
-				     * Need to get back to protected mode */
-				    "	movl	%cr0, %eax	\n" "	orl	$0x0000001, %eax\n"	/* PE = 1 */
-				    "	movl	%eax, %cr0	\n"
-				    /* Now that we are in protected mode jump to a 32 bit code segment. */
-				    "	data32	ljmp	$0x10, $vga_ec_restart\n"
-				    "vga_ec_restart:\n"
-				    "	.code32\n"
-				    "	movw	$0x18, %ax	\n"
-				    "	mov	%ax, %ds	\n"
-				    "	mov	%ax, %es	\n"
-				    "	mov	%ax, %fs	\n"
-				    "	mov	%ax, %gs	\n"
-				    "	mov	%ax, %ss	\n"
-				    /* restore proper gdt and idt */
-				    "	lgdt	%cs:gdtarg 	\n"
-				    "	lidt	idtarg		\n"
-				    "	.globl	vga__ec_exit	\n"
-				    "vga_ec_exit:\n"
-				    "	mov	__stack, %esp	\n"
-				    "	popal\n");
-}
-
-void do_vgabios(void)
-{
-	device_t dev;
-	unsigned long busdevfn;
-	unsigned int rom = 0;
-	unsigned char *buf;
-	unsigned int size = 64 * 1024;
-	int i;
-
-	/* clear vga bios data area */
-	for (i = 0x400; i < 0x500; i++) {
-		*(unsigned char *)i = 0;
-	}
-
-	dev = dev_find_class(PCI_CLASS_DISPLAY_VGA << 8, 0);
-
-	if (!dev) {
-		printk(BIOS_DEBUG, "NO VGA FOUND\n");
-		return;
-	}
-	printk(BIOS_DEBUG, "found VGA: vid=%x, did=%x\n", dev->vendor, dev->device);
-
-	/* declare rom address here - keep any config data out of the way
-	 * of core LXB stuff */
-
-#warning ROM address hardcoded to 512K
-	rom = (unsigned int)cbfs_load_optionrom(dev->vendor, dev->device, 0); 
-	pci_write_config32(dev, PCI_ROM_ADDRESS, rom | 1);
-	printk(BIOS_DEBUG, "rom base, size: %x\n", rom);
-
-	buf = (unsigned char *)rom;
-	if ((buf[0] == 0x55) && (buf[1] == 0xaa)) {
-		memcpy((void *)0xc0000, buf, size);
-
-		write_protect_vgabios();	// in northbridge
-
-		// check signature again
-		buf = (unsigned char *)0xc0000;
-		if (buf[0] == 0x55 && buf[1] == 0xAA) {
-			busdevfn =
-			    (dev->bus->secondary << 8) | dev->path.pci.devfn;
-			printk(BIOS_DEBUG, "bus/devfn = %#lx\n", busdevfn);
-
-			real_mode_switch_call_vga(busdevfn);
-		} else
-			printk(BIOS_DEBUG, "Failed to copy VGA BIOS to 0xc0000\n");
-	} else
-		printk(BIOS_DEBUG, "BAD SIGNATURE 0x%x 0x%x\n", buf[0], buf[1]);
-
-	pci_write_config32(dev, PCI_ROM_ADDRESS, 0);
-}
-
-// we had hoped to avoid this. 
-// this is a stub IDT only. It's main purpose is to ignore calls 
-// to the BIOS. 
-// no longer. Dammit. We have to respond to these.
-struct realidt {
-	unsigned short offset, cs;
-};
-
-// from a handy writeup that andrey found.
-
-// handler. 
-// There are some assumptions we can make here. 
-// First, the Top Of Stack (TOS) is located on the top of page zero. 
-// we can share this stack between real and protected mode. 
-// that simplifies a lot of things ...
-// we'll just push all the registers on the stack as longwords, 
-// and pop to protected mode. 
-// second, since this only ever runs as part of linuxbios, 
-// we know all the segment register values -- so we don't save any.
-// keep the handler that calls things small. It can do a call to 
-// more complex code in linuxbios itself. This helps a lot as we don't
-// have to do address fixup in this little stub, and calls are absolute
-// so the handler is relocatable.
-void handler(void)
-{
-	__asm__ __volatile__("	.code16		\n"
-			     "idthandle:		\n"
-			     "	pushal		\n"
-			     "	movb 	$0, %al	\n"
-			     "	ljmp 	$0, $callbiosint16\n"
-			     "end_idthandle:		\n"
-			     "	.code32		\n");
-}
-
-void debughandler(void)
-{
-	__asm__ __volatile__("	.code16		\n"
-			     "debughandle:		\n"
-			     "	pushw	%cx	\n"
-			     "	movw	$250, %cx \n"
-			     "dbh1:			\n"
-			     "	loop	dbh1	\n"
-			     "	popw	%cx	\n"
-			     "	iret		\n"
-			     "end_debughandle:	\n" ".code32		\n");
-}
-
-// Calling conventions. The first C function is called with this stuff
-// on the stack. They look like value parameters, but note that if you
-// modify them they will go back to the INTx function modified. 
-// the C function will call the biosint function with these as
-// REFERENCE parameters. In this way, we can easily get 
-// returns back to the INTx caller (i.e. vgabios)
-void callbiosint(void)
-{
-	__asm__ __volatile__("	.code16		\n"
-			     "callbiosint16:		\n"
-			     "	push	%ds	\n"
-			     "	push	%es	\n"
-			     "	push	%fs	\n" "	push	%gs	\n"
-			     // clean up the int #. To save space we put it in the lower
-			     // byte. But the top 24 bits are junk. 
-			     "	andl	$0xff, %eax\n"
-			     // this push does two things:
-			     // - put the INT # on the stack as a parameter
-			     // - provides us with a temp for the %cr0 mods.
-			     "	pushl	%eax	\n" "	movl    %cr0, %eax\n" "	orl	$0x00000001, %eax\n"	/* PE = 1 */
-			     "	movl	%eax, %cr0\n"
-			     /* Now that we are in protected mode jump to a 32 bit code segment. */
-			     "	data32  ljmp    $0x10, $biosprotect\n"
-			     "biosprotect:		\n"
-			     "	.code32		\n"
-			     "	movw	$0x18, %ax          \n"
-			     "	mov	%ax, %ds          \n"
-			     "	mov	%ax, %es          \n"
-			     "	mov	%ax, %fs          \n"
-			     "	mov	%ax, %gs          \n"
-			     "	mov	%ax, %ss          \n"
-			     "	lidt	idtarg         \n"
-			     "	call	biosint	\n"
-			     // back to real mode ...
-			     "	ljmp	$0x28, $__rms_16bit2\n"
-			     "__rms_16bit2:			\n"
-			     "	.code16			\n"
-			     /* 16 bit code from here on... */
-			     /* Load the segment registers w/ properly configured segment
-			      * descriptors.  They will retain these configurations (limits,
-			      * writability, etc.) once protected mode is turned off. */
-			     "	mov	$0x30, %ax	\n"
-			     "	mov	%ax, %ds	\n"
-			     "	mov	%ax, %es	\n"
-			     "	mov	%ax, %fs	\n"
-			     "	mov	%ax, %gs	\n"
-			     "	mov	%ax, %ss	\n"
-			     /* Turn off protection (bit 0 in CR0) */
-			     "	movl	%cr0, %eax		\n"
-			     "	andl	$0xFFFFFFFE, %eax	\n"
-			     "	movl	%eax, %cr0		\n"
-			     /* Now really going into real mode */
-			     "	ljmp $0,  $__rms_real2	\n"
-			     "__rms_real2:			\n"
-			     /* Setup a stack
-			      * FixME: where is esp? */
-			     "	mov	$0x0, %ax       \n"
-			     "	mov	%ax, %ss	\n"
-			     /* ebugging for RGM */
-			     "	mov	$0x11, %al	\n"
-			     "	outb	%al, $0x80	\n"
-			     /* Load our 16 it idt */
-			     "	xor	%ax, %ax	\n"
-			     "	mov	%ax, %ds	\n"
-			     "	lidt	__myidt		\n"
-			     /* Dump zeros in the other segregs */
-			     "	mov	%ax, %es	\n"
-			     "	mov	%ax, %fs	\n"
-			     "	mov	%ax, %gs	\n"
-			     "	mov	$0x40, %ax	\n"
-			     "	mov	%ax, %ds	\n"
-			     /* pop the INT # that you pushed earlier */
-			     "	popl	%eax		\n"
-			     "	pop	%gs		\n"
-			     "	pop	%fs		\n"
-			     "	pop	%es		\n"
-			     "	pop	%ds		\n"
-			     "	popal			\n"
-			     "	iret			\n"
-			     "	.code32			\n");
-}
-
-enum {
-	PCIBIOS = 0x1a,
-	MEMSIZE = 0x12
-};
-
-int pcibios(unsigned long *pedi, unsigned long *pesi, unsigned long *pebp,
-	    unsigned long *pesp, unsigned long *pebx, unsigned long *pedx,
-	    unsigned long *pecx, unsigned long *peax, unsigned long *pflags);
-
-int handleint21(unsigned long *pedi, unsigned long *pesi, unsigned long *pebp,
-		unsigned long *pesp, unsigned long *pebx, unsigned long *pedx,
-		unsigned long *pecx, unsigned long *peax,
-		unsigned long *pflags);
-
-extern void vga_exit(void);
-
-int biosint(unsigned long intnumber,
-	    unsigned long gsfs, unsigned long dses,
-	    unsigned long edi, unsigned long esi,
-	    unsigned long ebp, unsigned long esp,
-	    unsigned long ebx, unsigned long edx,
-	    unsigned long ecx, unsigned long eax,
-	    unsigned long cs_ip, unsigned short stackflags)
-{
-	unsigned long ip;
-	unsigned long cs;
-	unsigned long flags;
-	int ret = -1;
-
-	ip = cs_ip & 0xffff;
-	cs = cs_ip >> 16;
-	flags = stackflags;
-
-	printk(BIOS_DEBUG, "biosint: INT# 0x%lx\n", intnumber);
-	printk(BIOS_DEBUG, "biosint: eax 0x%lx ebx 0x%lx ecx 0x%lx edx 0x%lx\n",
-		     eax, ebx, ecx, edx);
-	printk(BIOS_DEBUG, "biosint: ebp 0x%lx esp 0x%lx edi 0x%lx esi 0x%lx\n",
-		     ebp, esp, edi, esi);
-	printk(BIOS_DEBUG, "biosint:  ip 0x%lx   cs 0x%lx  flags 0x%lx\n",
-		     ip, cs, flags);
-
-	// cases in a good compiler are just as good as your own tables. 
-	switch (intnumber) {
-	case 0 ... 15:
-		// These are not BIOS service, but the CPU-generated exceptions
-		printk(BIOS_INFO, "biosint: Oops, exception %lu\n", intnumber);
-		if (esp < 0x1000) {
-			printk(BIOS_DEBUG, "Stack contents: ");
-			while (esp < 0x1000) {
-				printk(BIOS_DEBUG, "0x%04x ", *(unsigned short *)esp);
-				esp += 2;
-			}
-			printk(BIOS_DEBUG, "\n");
-		}
-		printk(BIOS_DEBUG, "biosint: Bailing out\n");
-		// "longjmp"
-		vga_exit();
-		break;
-
-	case PCIBIOS:
-		ret = pcibios(&edi, &esi, &ebp, &esp,
-			      &ebx, &edx, &ecx, &eax, &flags);
-		break;
-	case MEMSIZE:
-		// who cares. 
-		eax = 64 * 1024;
-		ret = 0;
-		break;
-	case 0x15:
-		ret = handleint21(&edi, &esi, &ebp, &esp,
-				  &ebx, &edx, &ecx, &eax, &flags);
-		break;
-	default:
-		printk(BIOS_INFO, "BIOSINT: Unsupport int #0x%lx\n", intnumber);
-		break;
-	}
-	if (ret)
-		flags |= 1;	// carry flags
-	else
-		flags &= ~1;
-	stackflags = flags;
-	return ret;
-}
-
-void setup_realmode_idt(void)
-{
-	extern unsigned char idthandle, end_idthandle;
-	extern unsigned char debughandle, end_debughandle;
-
-	int i;
-	struct realidt *idts = (struct realidt *)0;
-	int codesize = &end_idthandle - &idthandle;
-	unsigned char *intbyte, *codeptr;
-
-	// for each int, we create a customized little handler
-	// that just pushes %ax, puts the int # in %al, 
-	// then calls the common interrupt handler. 
-	// this necessitated because intel didn't know much about 
-	// architecture when they did the 8086 (it shows)
-	// (hmm do they know anymore even now :-)
-	// obviously you can see I don't really care about memory 
-	// efficiency. If I did I would probe back through the stack
-	// and get it that way. But that's really disgusting.
-	for (i = 0; i < 256; i++) {
-		idts[i].cs = 0;
-		codeptr = (unsigned char *)4096 + i * codesize;
-		idts[i].offset = (unsigned)codeptr;
-		memcpy(codeptr, &idthandle, codesize);
-		intbyte = codeptr + 3;
-		*intbyte = i;
-	}
-
-	// fixed entry points
-
-	// VGA BIOSes tend to hardcode f000:f065 as the previous handler of
-	// int10. 
-	// calling convention here is the same as INTs, we can reuse
-	// the int entry code.
-	codeptr = (unsigned char *)0xff065;
-	memcpy(codeptr, &idthandle, codesize);
-	intbyte = codeptr + 3;
-	*intbyte = 0x42;	/* int42 is the relocated int10 */
-
-	// VIA's VBIOS will call f000:f859 instead of sending int15.
-	codeptr = (unsigned char *)0xff859;
-	memcpy(codeptr, &idthandle, codesize);
-	intbyte = codeptr + 3;
-	*intbyte = 0x15;
-
-	/* debug handler - useful to set a programmable delay between instructions if the
-	   TF bit is set upon call to real mode */
-	idts[1].cs = 0;
-	idts[1].offset = 16384;
-	memcpy((void *)16384UL, &debughandle, &end_debughandle - &debughandle);
-}
-
-enum {
-	CHECK = 0xb001,
-	FINDDEV = 0xb102,
-	READCONFBYTE = 0xb108,
-	READCONFWORD = 0xb109,
-	READCONFDWORD = 0xb10a,
-	WRITECONFBYTE = 0xb10b,
-	WRITECONFWORD = 0xb10c,
-	WRITECONFDWORD = 0xb10d
-};
-
-// errors go in AH. Just set these up so that word assigns
-// will work. KISS. 
-enum {
-	PCIBIOS_NODEV = 0x8600,
-	PCIBIOS_BADREG = 0x8700
-};
-
-int
-pcibios(unsigned long *pedi, unsigned long *pesi, unsigned long *pebp,
-	unsigned long *pesp, unsigned long *pebx, unsigned long *pedx,
-	unsigned long *pecx, unsigned long *peax, unsigned long *pflags)
-{
-	unsigned short func = (unsigned short)(*peax);
-	int retval = 0;
-	unsigned short devid, vendorid, devfn;
-	short devindex;		/* Use short to get rid of garbage in upper half of 32-bit register */
-	unsigned char bus;
-	device_t dev;
-
-	switch (func) {
-	case CHECK:
-		*pedx = 0x4350;
-		*pecx = 0x2049;
-		retval = 0;
-		break;
-	case FINDDEV:
-		{
-			devid = *pecx;
-			vendorid = *pedx;
-			devindex = *pesi;
-			dev = 0;
-			while ((dev = dev_find_device(vendorid, devid, dev))) {
-				if (devindex <= 0)
-					break;
-				devindex--;
-			}
-			if (dev) {
-				unsigned short busdevfn;
-				*peax = 0;
-				// busnum is an unsigned char;
-				// devfn is an int, so we mask it off. 
-				busdevfn = (dev->bus->secondary << 8)
-				    | (dev->path.pci.devfn & 0xff);
-				printk(BIOS_DEBUG, "0x%x: return 0x%x\n", func,
-					     busdevfn);
-				*pebx = busdevfn;
-				retval = 0;
-			} else {
-				*peax = PCIBIOS_NODEV;
-				retval = -1;
-			}
-		}
-		break;
-	case READCONFDWORD:
-	case READCONFWORD:
-	case READCONFBYTE:
-	case WRITECONFDWORD:
-	case WRITECONFWORD:
-	case WRITECONFBYTE:
-		{
-			unsigned long dword;
-			unsigned short word;
-			unsigned char byte;
-			unsigned char reg;
-
-			devfn = *pebx & 0xff;
-			bus = *pebx >> 8;
-			reg = *pedi;
-			dev = dev_find_slot(bus, devfn);
-			if (!dev) {
-				printk(BIOS_DEBUG, "0x%x: BAD DEVICE bus %d devfn 0x%x\n",
-				     func, bus, devfn);
-				// idiots. the pcibios guys assumed you'd never pass a bad bus/devfn!
-				*peax = PCIBIOS_BADREG;
-				retval = -1;
-			}
-			switch (func) {
-			case READCONFBYTE:
-				byte = pci_read_config8(dev, reg);
-				*pecx = byte;
-				break;
-			case READCONFWORD:
-				word = pci_read_config16(dev, reg);
-				*pecx = word;
-				break;
-			case READCONFDWORD:
-				dword = pci_read_config32(dev, reg);
-				*pecx = dword;
-				break;
-			case WRITECONFBYTE:
-				byte = *pecx;
-				pci_write_config8(dev, reg, byte);
-				break;
-			case WRITECONFWORD:
-				word = *pecx;
-				pci_write_config16(dev, reg, word);
-				break;
-			case WRITECONFDWORD:
-				dword = *pecx;
-				pci_write_config32(dev, reg, dword);
-				break;
-			}
-
-			if (retval)
-				retval = PCIBIOS_BADREG;
-			printk(BIOS_DEBUG, "0x%x: bus %d devfn 0x%x reg 0x%x val 0x%lx\n",
-			     func, bus, devfn, reg, *pecx);
-			*peax = 0;
-			retval = 0;
-		}
-		break;
-	default:
-		printk(BIOS_ERR, "UNSUPPORTED PCIBIOS FUNCTION 0x%x\n", func);
-		break;
-	}
-
-	return retval;
-}
-
-int handleint21(unsigned long *edi, unsigned long *esi, unsigned long *ebp,
-		unsigned long *esp, unsigned long *ebx, unsigned long *edx,
-		unsigned long *ecx, unsigned long *eax, unsigned long *flags)
-{
-	int res = -1;
-	switch (*eax & 0xffff) {
-	case 0x5f19:
-		break;
-	case 0x5f18:
-		*eax = 0x5f;
-		*ebx = 0x545;	// MCLK = 133, 32M frame buffer, 256 M main memory
-		*ecx = 0x060;
-		res = 0;
-		break;
-	case 0x5f00:
-		*eax = 0x8600;
-		break;
-	case 0x5f01:
-		*eax = 0x5f;
-		*ecx = (*ecx & 0xffffff00) | 2;	// panel type =  2 = 1024 * 768
-		res = 0;
-		break;
-	case 0x5f02:
-		*eax = 0x5f;
-		*ebx = (*ebx & 0xffff0000) | 2;
-		*ecx = (*ecx & 0xffff0000) | 0x401;	// PAL + crt only 
-		*edx = (*edx & 0xffff0000) | 0;	// TV Layout - default
-		res = 0;
-		break;
-	case 0x5f0f:
-		*eax = 0x860f;
-		break;
-	}
-	return res;
-}