* clean up all but two warnings on artecgroup dbe61

* integrate vsm init into normal x86.c code (so it can run above 1M)
* call void main(unsigned long bist) except void cache_as_ram_main(void)
  on Geode LX (as we do on almost all other platforms now)
* Unify Geode LX MSR setup (will bring most non-working LX targets back
  to life)

Signed-off-by: Stefan Reinauer <stepan@coresystems.de>
Acked-by: Patrick Georgi <patrick.georgi@coresystems.de>



git-svn-id: svn://svn.coreboot.org/coreboot/trunk@5471 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

5 files changed, 66 insertions, 768 deletions

diff --git a/src/cpu/amd/model_lx/Kconfig b/src/cpu/amd/model_lx/Kconfig
index 769c600a46..66e20ec45e 100644
--- a/src/cpu/amd/model_lx/Kconfig
+++ b/src/cpu/amd/model_lx/Kconfig
@@ -23,7 +23,7 @@ config GEODE_VSA
 
 config VSA_FILE
 	string "AMD Geode LX VSA path and filename"
-	depends on GEODE_VSA
+	depends on GEODE_VSA && CPU_AMD_LX
 	default "gpl_vsa_lx_102.bin"
 	help
 	  The path and filename of the file to use as VSA.
diff --git a/src/cpu/amd/model_lx/Makefile.inc b/src/cpu/amd/model_lx/Makefile.inc
index 66dcd31ffe..4752378d41 100644
--- a/src/cpu/amd/model_lx/Makefile.inc
+++ b/src/cpu/amd/model_lx/Makefile.inc
@@ -5,6 +5,5 @@ subdirs-y += ../../x86/smm
 
 driver-y += model_lx_init.o
 obj-y += cpubug.o
-obj-y += vsmsetup.o
 
 cpu_incs += $(src)/cpu/amd/model_lx/cache_as_ram.inc
diff --git a/src/cpu/amd/model_lx/cache_as_ram.inc b/src/cpu/amd/model_lx/cache_as_ram.inc
index 096a96155d..f776a7a727 100644
--- a/src/cpu/amd/model_lx/cache_as_ram.inc
+++ b/src/cpu/amd/model_lx/cache_as_ram.inc
@@ -34,6 +34,8 @@
 /**
 /***************************************************************************/
 DCacheSetup:
+	/* Save the BIST result */
+	movl    %eax, %ebx
 
 	invd
 	/* set cache properties */
@@ -173,9 +175,17 @@ DCacheSetupBad:
 	hlt		/* issues */
 	jmp DCacheSetupBad
 DCacheSetupGood:
-
 	/* Go do early init and memory setup */
-	call	cache_as_ram_main
+
+	/* Restore the BIST result */
+	movl	%ebx, %eax
+	movl	%esp, %ebp
+	pushl	%eax
+
+	post_code(0x23)
+
+	/* Call romstage.c main function */
+	call	main
 done_cache_as_ram_main:
 
         /* We now run over the stack-in-cache, copying it back to itself to invalidate the cache */
diff --git a/src/cpu/amd/model_lx/msrinit.c b/src/cpu/amd/model_lx/msrinit.c
new file mode 100644
index 0000000000..2ed7c94f71
--- /dev/null
+++ b/src/cpu/amd/model_lx/msrinit.c
@@ -0,0 +1,53 @@
+/*
+ * This file is part of the coreboot project.
+ * 
+ * Copyright (C) 2010 coresystems GmbH
+ *
+ * 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
+ */
+
+struct msrinit {
+	u32 msrnum;
+	msr_t msr;
+};
+
+static const struct msrinit msr_table[] = 
+{
+	{CPU_RCONF_DEFAULT, {.hi = 0x24fffc02,.lo = 0x1000A000}}, /* Setup access to cache under 1MB.
+								   * Rom Properties: Write Serialize, WriteProtect.
+								   * RomBase: 0xFFFC0
+								   * SysTop to RomBase Properties: Write Serialize, Cache Disable.
+								   * SysTop: 0x000A0
+								   * System Memory Properties:  (Write Back) */
+	{CPU_RCONF_A0_BF,   {.hi = 0x00000000,.lo = 0x00000000}}, /* 0xA0000-0xBFFFF : (Write Back) */
+	{CPU_RCONF_C0_DF,   {.hi = 0x00000000,.lo = 0x00000000}}, /* 0xC0000-0xDFFFF : (Write Back) */
+	{CPU_RCONF_E0_FF,   {.hi = 0x00000000,.lo = 0x00000000}}, /* 0xE0000-0xFFFFF : (Write Back) */
+       
+	/* Setup access to memory under 1MB. Note: VGA hole at 0xA0000-0xBFFFF */
+	{MSR_GLIU0_BASE1,   {.hi = 0x20000000,.lo = 0x000fff80}}, // 0x00000-0x7FFFF
+	{MSR_GLIU0_BASE2,   {.hi = 0x20000000,.lo = 0x080fffe0}}, // 0x80000-0x9FFFF
+	{MSR_GLIU0_SHADOW,  {.hi = 0x2000FFFF,.lo = 0xFFFF0003}}, // 0xC0000-0xFFFFF
+	{MSR_GLIU1_BASE1,   {.hi = 0x20000000,.lo = 0x000fff80}}, // 0x00000-0x7FFFF
+	{MSR_GLIU1_BASE2,   {.hi = 0x20000000,.lo = 0x080fffe0}}, // 0x80000-0x9FFFF
+	{MSR_GLIU1_SHADOW,  {.hi = 0x2000FFFF,.lo = 0xFFFF0003}}, // 0xC0000-0xFFFFF
+};
+
+static void msr_init(void)
+{
+	int i;
+	for (i = 0; i < ARRAY_SIZE(msr_table); i++)
+		wrmsr(msr_table[i].msrnum, msr_table[i].msr);
+}
+
+
diff --git a/src/cpu/amd/model_lx/vsmsetup.c b/src/cpu/amd/model_lx/vsmsetup.c
deleted file mode 100644
index d2a3c58344..0000000000
--- a/src/cpu/amd/model_lx/vsmsetup.c
+++ /dev/null
@@ -1,764 +0,0 @@
-#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 <cpu/amd/lxdef.h>
-#include <cpu/amd/vr.h>
-#include <cbfs.h>
-
-#define VSA2_BUFFER			0x60000
-#define VSA2_ENTRY_POINT	0x60020
-
-/* vsmsetup.c derived from 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
- *
- *  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; either version 2 of the License, or
- *  (at your option) any later version.
- *
- *  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.
- *
- * 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.
- *
- *  $Id: vsmsetup.c,v 1.8 2006/09/08 12:47:57 andrei Exp $
- *
- * Copyright (C) 2007 Advanced Micro Devices, Inc.
- *
- *--------------------------------------------------------------------*/
-
-/* Modified to be a self sufficient plug in so that it can be used
-   without reliance on other parts of core coreboot
-   (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_vsm(unsigned long smm, unsigned long sysm)
-{
-	uint16_t entryHi = (VSA2_ENTRY_POINT & 0xffff0000) >> 4;
-	uint16_t entryLo = (VSA2_ENTRY_POINT & 0xffff);
-
-	__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"
-#if 0
-		/* I'm not happy about that pushal followed by esp-relative
-		 * references. Just do hard-codes for now
-		 */
-		"	movl    8(%%ebp), %%ecx	\n"
-		"	movl    12(%%ebp), %%edx	\n"
-#endif
-		"	movl    %0, %%ecx	\n"
-		"	movl    %1, %%edx	\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"
-		/* FixMe: Big real mode for gs, fs? */
-		"	mov	%%ax, %%fs     	\n"
-		"	mov	%%ax, %%gs     	\n"
-		"	mov	$0x40, %%ax	\n"
-		"	mov	%%ax, %%ds	\n"
-		//"     mov     %%cx, %%ax      \n"
-		"	movl    %0, %%ecx	\n"
-		"	movl    %1, %%edx	\n"
-		/* call the VSA2 entry point address */
-		"	lcall	%2, %3\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, $vsmrestart\n"
-		"vsmrestart:\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 vsm_exit		\n"
-		"vsm_exit:			\n"
-		"	mov	__stack, %%esp	\n"
-		"	popal			\n"::
-		"g" (smm), "g"(sysm), "g"(entryHi), "g"(entryLo)
-	);
-}
-
-__asm__(".text\n" "real_mode_switch_end:\n");
-extern char real_mode_switch_end[];
-
-// andrei: some VSA virtual register helpers: raw read and MSR read
-
-uint32_t VSA_vrRead(uint16_t classIndex)
-{
-	unsigned eax, ebx, ecx, edx;
-	asm volatile (
-		"movw	$0x0AC1C, %%dx		\n"
-		"orl	$0x0FC530000, %%eax	\n"
-		"outl	%%eax, %%dx		\n"
-		"addb	$2, %%dl		\n"
-		"inw	%%dx, %%ax		\n"
-		: "=a" (eax), "=b"(ebx), "=c"(ecx), "=d"(edx) 
-		: "a"(classIndex)
-	);
-
-	return eax;
-}
-
-uint32_t VSA_msrRead(uint32_t msrAddr)
-{
-	unsigned eax, ebx, ecx, edx;
-	asm volatile (
-		"movw	$0x0AC1C, %%dx			\n"
-		"movl	$0x0FC530007, %%eax		\n"
-		"outl	%%eax, %%dx				\n"
-		"addb	$2, %%dl				\n"
-		"inw	%%dx, %%ax				\n"
-		: "=a" (eax), "=b"(ebx), "=c"(ecx), "=d"(edx)
-		: "c"(msrAddr)
-	);
-
-	return eax;
-}
-
-void do_vsmbios(void)
-{
-	unsigned char *buf;
-	int i;
-
-	printk(BIOS_ERR, "do_vsmbios\n");
-	/* clear vsm bios data area */
-	for (i = 0x400; i < 0x500; i++) {
-		*(volatile unsigned char *)i = 0;
-	}
-
-	/* declare rom address here - keep any config data out of the way
-	 * of core LXB stuff */
-
-	/* this is the base of rom on the LX at present. At some point, this has to be
-	 * much better parameterized
-	 */
-
-	if ((unsigned int)cbfs_load_stage("vsa") != VSA2_ENTRY_POINT) {
-		printk(BIOS_ERR, "do_vsmbios: Failed to load VSA.\n");
-	}
-	buf = (unsigned char *)VSA2_BUFFER;
-	printk(BIOS_DEBUG, "buf %p *buf %d buf[256k] %d\n",
-		     buf, buf[0], buf[SMM_SIZE * 1024]);
-	printk(BIOS_DEBUG, "buf[0x20] signature is %x:%x:%x:%x\n",
-		     buf[0x20], buf[0x21], buf[0x22], buf[0x23]);
-	/* check for post code at start of vsainit.bin. If you don't see it,
-	   don't bother. */
-	if ((buf[0x20] != 0xb0) || (buf[0x21] != 0x10) ||
-	    (buf[0x22] != 0xe6) || (buf[0x23] != 0x80)) {
-		printk(BIOS_ERR, "do_vsmbios: no vsainit.bin signature, skipping!\n");
-		return;
-	}
-
-	/* ecx gets smm, edx gets sysm */
-	printk(BIOS_ERR, "Call real_mode_switch_call_vsm\n");
-	real_mode_switch_call_vsm(MSR_GLIU0_SMM, MSR_GLIU0_SYSMEM);
-
-	/* restart timer 1 */
-	outb(0x56, 0x43);
-	outb(0x12, 0x41);
-
-	// check that VSA is running OK
-	if (VSA_vrRead(SIGNATURE) == VSA2_SIGNATURE)
-		printk(BIOS_DEBUG, "do_vsmbios: VSA2 VR signature verified\n");
-	else
-		printk(BIOS_ERR, "do_vsmbios: VSA2 VR signature not valid, install failed!\n");
-}
-
-// 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 coreboot,
-// 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 coreboot 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" 
-		"	movb	$0xbb, %al\n" 
-		"	outb	%al, $0x80\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? */
-		/* no need for a fix here. The esp is shared from 32-bit and 16-bit mode.
-		 * you have to hack on the ss, but the esp remains the same across
-		 * modes.
-		 */
-		"	mov	$0x0, %ax       \n"
-		"	mov	%ax, %ss	\n"
-		/* debugging for RGM */
-		"	mov	$0x11, %al	\n"
-		"	outb	%al, $0x80	\n"
-		/* Load our 16 bit 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);
-
-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%x   cs 0x%x  flags 0x%x\n",
-		     (u32)ip, (u32)cs, (u32)flags);
-	printk(BIOS_DEBUG, "biosint: gs 0x%x fs 0x%x ds 0x%x es 0x%x\n",
-		     (u16)(gsfs >> 16), (u16)(gsfs & 0xffff), (u16)(dses >> 16), (u16)(dses & 0xffff));
-
-	// 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 0x%x\n", (u32)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 ... not now\n");
-		// "longjmp"
-		//vga_exit();
-		break;
-
-	case PCIBIOS:
-		ret = pcibios(&edi, &esi, &ebp, &esp,
-			      &ebx, &edx, &ecx, &eax, &flags);
-		break;
-	case MEMSIZE:
-		// who cares.
-		eax = 128 * 1024;
-		ret = 0;
-		break;
-	case 0x15:
-		ret = handleint21(&edi, &esi, &ebp, &esp,
-				  &ebx, &edx, &ecx, &eax, &flags);
-		break;
-	default:
-		printk(BIOS_INFO, "BIOSINT: Unsupported int #0x%x\n", (u32)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 */
-
-	/* 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 *)16384, &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 gabage 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;
-	printk(BIOS_DEBUG, "handleint21, eax 0x%x\n", (u32)*eax);
-	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;
-	case 0xBEA7:
-		*eax = 66;
-		break;
-	case 0xBEA4:
-		*eax = 500;
-		break;
-	}
-	return res;
-}