vga support
git-svn-id: svn://svn.coreboot.org/coreboot/trunk@1169 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
This commit is contained in:
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ab1f217161
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848d336534
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@ -178,12 +178,18 @@ end
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###############################################
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define HAVE_FALLBACK_BOOT
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format "%d"
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default 0
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export always
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comment "Set if fallback booting required"
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end
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define USE_FALLBACK_IMAGE
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<<<<<<< Options.lb
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format "%d"
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default 0
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=======
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default 1
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>>>>>>> 1.23
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export used
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comment "Set to build a fallback image"
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end
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@ -410,6 +416,12 @@ define CONFIG_KEYBOARD
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export used
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comment "Run PC keyboard enable code"
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end
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define CONFIG_LEGACY_VGABIOS
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default 0
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export used
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comment "Support for legacy VGA BIOS"
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end
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###############################################
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# SMP options
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###############################################
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@ -18,3 +18,7 @@ end
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if CONFIG_KEYBOARD
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object keyboard.o
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end
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if CONFIG_LEGACY_VGABIOS
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object vgabios.o
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end
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@ -0,0 +1,618 @@
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#include <pci.h>
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#include <pci_ids.h>
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#undef __KERNEL__
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#include <arch/io.h>
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#include <printk.h>
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#include <string.h>
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#include "vgachip.h"
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/* vgabios.c. Derived from: */
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/*------------------------------------------------------------ -*- C -*-
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* 2 Kernel Monte a.k.a. Linux loading Linux on x86
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*
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* Erik Arjan Hendriks <hendriks@lanl.gov>
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*
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* This version is a derivative of the original two kernel monte
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* which is (C) 2000 Scyld.
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*
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* Copyright (C) 2000 Scyld Computing Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* Portions related to the alpha architecture are:
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*
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* Copyright(C) 2001 University of California. LA-CC Number 01-67.
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* This software has been authored by an employee or employees of the
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* University of California, operator of the Los Alamos National
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* Laboratory under Contract No. W-7405-ENG-36 with the U.S.
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* Department of Energy. The U.S. Government has rights to use,
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* reproduce, and distribute this software. If the software is
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* modified to produce derivative works, such modified software should
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* be clearly marked, so as not to confuse it with the version
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* available from LANL.
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*
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* This software may be used and distributed according to the terms
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* of the GNU General Public License, incorporated herein by
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* reference to http://www.gnu.org/licenses/gpl.html.
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*
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* This software is provided by the author(s) "as is" and any express
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* or implied warranties, including, but not limited to, the implied
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* warranties of merchantability and fitness for a particular purpose
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* are disclaimed. In no event shall the author(s) be liable for any
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* direct, indirect, incidental, special, exemplary, or consequential
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* damages (including, but not limited to, procurement of substitute
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* goods or services; loss of use, data, or profits; or business
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* interruption) however caused and on any theory of liability,
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* whether in contract, strict liability, or tort (including
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* negligence or otherwise) arising in any way out of the use of this
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* software, even if advised of the possibility of such damage.
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*
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* $Id$
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*--------------------------------------------------------------------*/
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/* The address arguments to this function are PHYSICAL ADDRESSES */
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static void real_mode_switch_call_vga(unsigned long devfn)
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{
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__asm__ __volatile__
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(
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// paranoia -- does ecx get saved? not sure. This is
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// the easiest safe thing to do.
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"pushal\n"
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/* save the stack */
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"mov %esp, __stack\n"
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"jmp 1f\n"
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"__stack: .long 0\n"
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"1:\n"
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/* get devfn into %ecx */
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"movl %esp, %ebp\n"
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"movl 8(%ebp), %ecx\n"
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/* This configures CS properly for real mode. */
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" ljmp $0x28, $__rms_16bit\n"
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"__rms_16bit: \n"
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".code16 \n" /* 16 bit code from here on... */
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/* Load the segment registers w/ properly configured segment
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* descriptors. They will retain these configurations (limits,
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* writability, etc.) once protected mode is turned off. */
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" mov $0x30, %ax \n"
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" mov %ax, %ds \n"
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" mov %ax, %es \n"
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" mov %ax, %fs \n"
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" mov %ax, %gs \n"
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" mov %ax, %ss \n"
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/* Turn off protection (bit 0 in CR0) */
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" movl %cr0, %eax \n"
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" andl $0xFFFFFFFE, %eax \n"
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" movl %eax, %cr0 \n"
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/* Now really going into real mode */
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" ljmp $0, $__rms_real \n"
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"__rms_real: \n"
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// put the stack at the end of page zero.
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// that way we can easily share it between real and protected,
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// since the 16-bit ESP at segment 0 will work for any case.
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/* Setup a stack */
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" mov $0x0, %ax \n"
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" mov %ax, %ss \n"
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" movl $0x1000, %eax \n"
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" movl %eax, %esp \n"
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/* debugging for RGM */
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" mov $0x11, %al \n"
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" outb %al, $0x80\n"
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/* Dump zeros in the other segregs */
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" xor %ax, %ax \n"
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" mov %ax, %ds \n"
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" mov %ax, %es \n"
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" mov %ax, %fs \n"
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" mov %ax, %gs \n"
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" mov %cx, %ax \n"
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" .byte 0x9a, 0x03, 0, 0, 0xc0 \n"
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" movb $0x55, %al\noutb %al, $0x80\n"
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/* if we got here, just about done.
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* Need to get back to protected mode */
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"movl %cr0, %eax\n"
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// "andl $0x7FFAFFD1, %eax\n" /* PG,AM,WP,NE,TS,EM,MP = 0 */
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// "orl $0x60000001, %eax\n" /* CD, NW, PE = 1 */
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"orl $0x0000001, %eax\n" /* PE = 1 */
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"movl %eax, %cr0\n"
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/* Now that we are in protected mode jump to a 32 bit code segment. */
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"data32 ljmp $0x10, $vgarestart\n"
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"vgarestart:\n"
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".code32\n"
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" movw $0x18, %ax \n"
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" mov %ax, %ds \n"
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" mov %ax, %es \n"
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" mov %ax, %fs \n"
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" mov %ax, %gs \n"
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" mov %ax, %ss \n"
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".globl vga_exit\n"
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"vga_exit:\n"
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" mov __stack, %esp\n"
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" popal\n"
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);
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}
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__asm__ (".text\n""real_mode_switch_end:\n");
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extern char real_mode_switch_end[];
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void
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do_vgabios(void)
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{
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struct pci_dev *dev;
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unsigned long busdevfn;
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unsigned int rom = 0;
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unsigned char *buf;
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unsigned int size = 64*1024;
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int i;
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for (i=0x400; i<0x500; i++) {
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printk_debug("%02x%c", *(unsigned char *)i, i%16==15 ? '\n' : ' ');
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*(unsigned char *) i = 0;
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}
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for (i=0x400; i<0x500; i++) {
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printk_debug("%02x%c", *(unsigned char *)i, i%16==15 ? '\n' : ' ');
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}
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dev = pci_find_class(PCI_CLASS_DISPLAY_VGA <<8, NULL);
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if (! dev) {
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printk_debug("NO VGA FOUND\n");
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return;
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}
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printk_debug("found VGA: vid=%x, did=%x\n", dev->vendor, dev->device);
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#ifdef VGABIOS_START
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// Use VGA BIOS blob at specified address
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rom = VGABIOS_START;
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#else
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pci_read_config32(dev, PCI_ROM_ADDRESS, &rom);
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// paranoia
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rom = 0xf0000000;
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pci_write_config32(dev, PCI_ROM_ADDRESS, rom|1);
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printk_debug("rom base, size: %x\n", rom);
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#endif
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buf = (unsigned char *) rom;
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if ((buf[0] == 0x55) && (buf[1] = 0xaa)) {
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memcpy((void *) 0xc0000, buf, size);
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for(i = 0; i < 16; i++)
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printk_debug("0x%x ", buf[i]);
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// check signature here later!
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busdevfn = (dev->bus->secondary << 8) | dev->devfn;
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real_mode_switch_call_vga(busdevfn);
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} else
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printk_debug("BAD SIGNATURE 0x%x 0x%x\n", buf[0], buf[1]);
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#ifndef VGABIOS_START
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pci_write_config32(dev, PCI_ROM_ADDRESS, 0);
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#endif
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}
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// we had hoped to avoid this.
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// this is a stub IDT only. It's main purpose is to ignore calls
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// to the BIOS.
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// no longer. Dammit. We have to respond to these.
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struct realidt {
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unsigned short offset, cs;
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};
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// from a handy writeup that andrey found.
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// handler.
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// There are some assumptions we can make here.
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// First, the Top Of Stack (TOS) is located on the top of page zero.
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// we can share this stack between real and protected mode.
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// that simplifies a lot of things ...
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// we'll just push all the registers on the stack as longwords,
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// and pop to protected mode.
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// second, since this only ever runs as part of linuxbios,
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// we know all the segment register values -- so we don't save any.
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// keep the handler that calls things small. It can do a call to
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// more complex code in linuxbios itself. This helps a lot as we don't
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// have to do address fixup in this little stub, and calls are absolute
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// so the handler is relocatable.
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void handler(void) {
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__asm__ __volatile__ (
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".code16\n"
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"idthandle:\n"
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" pushal\n"
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" movb $0, %al\n"
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" ljmp $0, $callbiosint16\n"
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"end_idthandle:\n"
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".code32\n"
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);
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}
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// Calling conventions. The first C function is called with this stuff
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// on the stack. They look like value parameters, but note that if you
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// modify them they will go back to the INTx function modified.
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// the C function will call the biosint function with these as
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// REFERENCE parameters. In this way, we can easily get
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// returns back to the INTx caller (i.e. vgabios)
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void callbiosint(void) {
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__asm__ __volatile__ (
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".code16\n"
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"callbiosint16:\n"
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// clean up the int #. To save space we put it in the lower
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// byte. But the top 24 bits are junk.
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"andl $0xff, %eax\n"
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// this push does two things:
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// - put the INT # on the stack as a parameter
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// - provides us with a temp for the %cr0 mods.
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"pushl %eax\n"
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"movl %cr0, %eax\n"
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//"andl $0x7FFAFFD1, %eax\n" /* PG,AM,WP,NE,TS,EM,MP = 0 */
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//"orl $0x60000001, %eax\n" /* CD, NW, PE = 1 */
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"orl $0x00000001, %eax\n" /* PE = 1 */
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"movl %eax, %cr0\n"
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/* Now that we are in protected mode jump to a 32 bit code segment. */
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"data32 ljmp $0x10, $biosprotect\n"
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"biosprotect:\n"
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".code32\n"
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" movw $0x18, %ax \n"
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" mov %ax, %ds \n"
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" mov %ax, %es \n"
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" mov %ax, %fs \n"
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" mov %ax, %gs \n"
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" mov %ax, %ss \n"
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" call biosint \n"
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// back to real mode ...
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" ljmp $0x28, $__rms_16bit\n"
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"__rms_16bit: \n"
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".code16 \n" /* 16 bit code from here on... */
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/* Load the segment registers w/ properly configured segment
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* descriptors. They will retain these configurations (limits,
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* writability, etc.) once protected mode is turned off. */
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" mov $0x30, %ax \n"
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" mov %ax, %ds \n"
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" mov %ax, %es \n"
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" mov %ax, %fs \n"
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" mov %ax, %gs \n"
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" mov %ax, %ss \n"
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/* Turn off protection (bit 0 in CR0) */
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" movl %cr0, %eax \n"
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" andl $0xFFFFFFFE, %eax \n"
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" movl %eax, %cr0 \n"
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/* Now really going into real mode */
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" ljmp $0, $__rms_real \n"
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"__rms_real: \n"
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/* Setup a stack */
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" mov $0x0, %ax \n"
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" mov %ax, %ss \n"
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/* ebugging for RGM */
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" mov $0x11, %al \n"
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" outb %al, $0x80\n"
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" xor %ax, %ax \n"
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" mov %ax, %ds \n"
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" mov %ax, %es \n"
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" mov %ax, %fs \n"
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" mov %ax, %gs \n"
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// pop the INT # that you pushed earlier
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" popl %eax\n"
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" popal\n"
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" iret\n"
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".code32\n"
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);
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}
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enum {
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PCIBIOS = 0x1a,
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MEMSIZE = 0x12
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};
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int
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pcibios(
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unsigned long *pedi,
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unsigned long *pesi,
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unsigned long *pebp,
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unsigned long *pesp,
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unsigned long *pebx,
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unsigned long *pedx,
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unsigned long *pecx,
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unsigned long *peax,
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unsigned long *pflags
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);
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extern void vga_exit(void);
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int
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biosint(
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unsigned long intnumber,
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unsigned long edi,
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unsigned long esi,
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unsigned long ebp,
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unsigned long esp,
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unsigned long ebx,
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unsigned long edx,
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unsigned long ecx,
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unsigned long eax,
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unsigned long cs_ip,
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unsigned short stackflags
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) {
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unsigned long ip;
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unsigned long cs;
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unsigned long flags;
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int ret = -1;
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ip = cs_ip & 0xffff;
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cs = cs_ip >> 16;
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flags = stackflags;
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printk_debug("biosint: # 0x%lx, eax 0x%lx ebx 0x%lx ecx 0x%lx edx 0x%lx\n",
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intnumber, eax, ebx, ecx, edx);
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printk_debug("biosint: ebp 0x%lx esp 0x%lx edi 0x%lx esi 0x%lx\n", ebp, esp, edi, esi);
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printk_debug("biosint: ip 0x%x cs 0x%x flags 0x%x\n", ip, cs, flags);
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// cases in a good compiler are just as good as your own tables.
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switch (intnumber) {
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case 0 ... 15:
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// These are not BIOS service, but the CPU-generated exceptions
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printk_info("biosint: Oops, exception %u\n", intnumber);
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if (esp < 0x1000) {
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printk_debug("Stack contents: ");
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while (esp < 0x1000) {
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printk_debug("0x%04x ", *(unsigned short *) esp);
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esp += 2;
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}
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printk_debug("\n");
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}
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printk_debug("biosint: Bailing out\n");
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// "longjmp"
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vga_exit();
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break;
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case PCIBIOS:
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ret = pcibios( &edi, &esi, &ebp, &esp,
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&ebx, &edx, &ecx, &eax, &flags);
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break;
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case MEMSIZE:
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// who cares.
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eax = 64 * 1024;
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ret = 0;
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break;
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default:
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printk_info(__FUNCTION__ ": Unsupport int #0x%x\n",
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intnumber);
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break;
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}
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if (ret)
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flags |= 1; // carry flags
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else
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flags &= ~1;
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stackflags = flags;
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return ret;
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}
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void
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setup_realmode_idt(void) {
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extern unsigned char idthandle, end_idthandle;
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int i;
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struct realidt *idts = (struct realidt *) 0;
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int codesize = &end_idthandle - &idthandle;
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unsigned char *intbyte, *codeptr;
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// for each int, we create a customized little handler
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// that just pushes %ax, puts the int # in %al,
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||||
// 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 = (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 = (char*) 0xff065;
|
||||
memcpy(codeptr, &idthandle, codesize);
|
||||
intbyte = codeptr + 3;
|
||||
*intbyte = 0x42; /* int42 is the relocated int10 */
|
||||
}
|
||||
|
||||
|
||||
|
||||
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 long edi = *pedi;
|
||||
unsigned long esi = *pesi;
|
||||
unsigned long ebp = *pebp;
|
||||
unsigned long esp = *pesp;
|
||||
unsigned long ebx = *pebx;
|
||||
unsigned long edx = *pedx;
|
||||
unsigned long ecx = *pecx;
|
||||
unsigned long eax = *peax;
|
||||
unsigned long flags = *pflags;
|
||||
unsigned short func = (unsigned short) eax;
|
||||
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;
|
||||
struct pci_dev *dev;
|
||||
|
||||
switch(func) {
|
||||
case CHECK:
|
||||
*pedx = 0x4350;
|
||||
*pecx = 0x2049;
|
||||
retval = 0;
|
||||
break;
|
||||
case FINDDEV:
|
||||
{
|
||||
devid = *pecx;
|
||||
vendorid = *pedx;
|
||||
devindex = *pesi;
|
||||
dev = 0;
|
||||
while ((dev = pci_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->devfn & 0xff);
|
||||
printk_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 = pci_find_slot(bus, devfn);
|
||||
if (! dev) {
|
||||
printk_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;
|
||||
write_config8(dev, reg, byte);
|
||||
break;
|
||||
case WRITECONFWORD:
|
||||
word = *pecx;
|
||||
write_config16(dev, reg, word);
|
||||
break;
|
||||
case WRITECONFDWORD:
|
||||
word = *pecx;
|
||||
write_config32(dev, reg, dword);
|
||||
break;
|
||||
}
|
||||
|
||||
if (retval)
|
||||
retval = PCIBIOS_BADREG;
|
||||
printk_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_err("UNSUPPORTED PCIBIOS FUNCTION 0x%x\n", func);
|
||||
break;
|
||||
}
|
||||
|
||||
return retval;
|
||||
}
|
||||
|
||||
static void
|
||||
vga_init(struct chip *chip, enum chip_pass pass)
|
||||
{
|
||||
|
||||
struct pc80_vgabios_config *conf =
|
||||
(struct pc80_vgabios_config *)chip->chip_info;
|
||||
|
||||
switch (pass) {
|
||||
case CONF_PASS_PRE_BOOT:
|
||||
|
||||
break;
|
||||
|
||||
default:
|
||||
/* nothing yet */
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
static void enumerate(struct chip *chip)
|
||||
{
|
||||
/* don't really need to do anything */
|
||||
|
||||
}
|
||||
|
||||
struct chip_control southbridge_via_vt8231_control = {
|
||||
.enumerate = enumerate,
|
||||
enable: vga_init,
|
||||
name: "Legacy VGA bios"
|
||||
};
|
|
@ -0,0 +1,10 @@
|
|||
#ifndef _PC80_VGABIOS
|
||||
#define _PC80_VGABIOS
|
||||
|
||||
extern struct chip_control pc80_vgabios_control;
|
||||
|
||||
struct pc80_vgabios_config {
|
||||
int nothing;
|
||||
};
|
||||
|
||||
#endif /* _PC80_VGABIOS */
|
|
@ -41,6 +41,7 @@ uses USE_FALLBACK_IMAGE
|
|||
uses USE_OPTION_TABLE
|
||||
uses HAVE_OPTION_TABLE
|
||||
uses CONFIG_CHIP_CONFIGURE
|
||||
uses CONFIG_LEGACY_VGABIOS
|
||||
|
||||
uses CONFIG_CONSOLE_SERIAL8250
|
||||
uses TTYS0_BAUD
|
||||
|
@ -75,10 +76,10 @@ option k7=1
|
|||
option k8=1
|
||||
option ROM_SIZE=524288
|
||||
|
||||
option CONFIG_VGABIOS=1
|
||||
option CONFIG_REALMODE_IDT=1
|
||||
option CONFIG_PCIBIOS=1
|
||||
option VGABIOS_START=1
|
||||
option CONFIG_LEGACY_VGABIOS=1
|
||||
#option CONFIG_REALMODE_IDT=1
|
||||
#option CONFIG_PCIBIOS=1
|
||||
#option VGABIOS_START=1
|
||||
#option SCSIFW_START=0xfff80000
|
||||
|
||||
|
||||
|
|
Loading…
Reference in New Issue