first shot of legacybios emulation.

does not work yet.. sorry :-(


git-svn-id: svn://svn.coreboot.org/coreboot/trunk@1119 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

10 files changed, 972 insertions, 0 deletions

diff --git a/util/extensions/legacybios/arch/x86/Makefile b/util/extensions/legacybios/arch/x86/Makefile
new file mode 100644
index 0000000000..bb168c5b5e
--- /dev/null
+++ b/util/extensions/legacybios/arch/x86/Makefile
@@ -0,0 +1,64 @@
+# Copyright (C) 2003 Stefan Reinauer
+#
+# See the file "COPYING" for further information about
+# the copyright and warranty status of this work.
+#
+
+VPATH      := $(TOPDIR)/include:$(BUILDDIR):$(TOPDIR)/arch/$(ARCH)/include
+
+BINARIES   := legacybios.multiboot legacybios legacybios.full
+
+
+all: core link $(BINARIES)
+
+LDFLAGS_OPENBIOS = -nostdlib -Wl,-N -Wl,-Ttext -Wl,100000
+
+OBJS_GENERIC   =  lib.o legacybios.o console.o pcibios.o malloc.o pci.o libx86emu.a
+OBJS_MULTIBOOT =  mboot.o multiboot.o
+OBJS_PLAIN     =  boot.o plainboot.o
+OBJS_BUILTIN   =  boot.o builtin.o
+
+INCLUDES := -Iinclude -I$(TOPDIR)/include -I$(BUILDDIR)
+
+include $(TOPDIR)/Rules.make
+
+core:
+	echo -e "\nCompiling $(ARCH) architecture specific binaries"
+
+link: $(OBJS_MULTIBOOT) $(OBJS_PLAIN) $(OBJS_BUILTIN) $(OBJS_GENERIC)
+	cd $(BUILDDIR) && if [ ! -r legacybios.multiboot -o  ! -r legacybios \
+		-o ! -r legacybios.full ]; then echo -e "\nLinking:"; fi
+
+legacybios.multiboot: $(OBJS_MULTIBOOT) $(OBJS_GENERIC)
+	echo -ne "  multiboot image for grub... "
+	cd $(BUILDDIR) && $(CC) $(LDFLAGS_OPENBIOS) -o $@.nostrip $^ -lgcc
+	echo -e "\tok"
+	cd $(BUILDDIR) && objcopy -O binary -R .note -R .comment $@.nostrip $@
+  
+legacybios: $(OBJS_PLAIN) $(OBJS_GENERIC)
+	echo -n "  elf image (for LinuxBIOS)... "
+	cd $(BUILDDIR) && $(CC)  $(LDFLAGS_OPENBIOS) -o $@.nostrip $^ -lgcc
+	echo -e "\tok"
+	cd $(BUILDDIR) && objcopy -R .note -R .comment $@.nostrip $@ && strip -s $@
+
+
+rom.h: vgabios.rom
+	echo -n "  generating linkable rom..."
+	cd $(BUILDDIR) && ./bin2hex < $^ > $@
+	echo -e "\tok"
+
+legacybios.full: $(OBJS_BUILTIN) $(OBJS_GENERIC)
+	echo -n "  elf image with rom... "
+	cd $(BUILDDIR) && $(CC) $(LDFLAGS_OPENBIOS) -o $@.nostrip $(OBJS_BUILTIN) $(OBJS_GENERIC) -lgcc
+	echo -e "\tok"
+	cd $(BUILDDIR) && objcopy -R .note -R .comment $@.nostrip $@ && strip -s $@
+
+
+# dependencies. these are so small that we write them manually.
+
+multiboot.o: multiboot.c types.h config.h multiboot.h
+boot.o: boot.S multiboot.h
+mboot.o: mboot.S multiboot.h
+console.o: console.c types.h config.h
+plainboot.o: types.h config.h
+builtin.o: rom.h
diff --git a/util/extensions/legacybios/arch/x86/boot.S b/util/extensions/legacybios/arch/x86/boot.S
new file mode 100644
index 0000000000..90b2ec0df6
--- /dev/null
+++ b/util/extensions/legacybios/arch/x86/boot.S
@@ -0,0 +1,39 @@
+/* boot.S 
+ * assembler bootstrap
+ *
+ * Copyright (C) 2003 Stefan Reinauer
+ *
+ * See the file "COPYING" for further information about
+ * the copyright and warranty status of this work.
+ */
+
+#define ASM 1
+#include <multiboot.h>
+
+	.text
+
+	.code32
+	.globl	start, _start
+
+	/* unused */
+start:
+_start:
+	/* Initialize stack pointer.  */
+	movl	$(stack + STACK_SIZE), %esp
+
+	/* Reset EFLAGS.  */
+	pushl	$0
+	popf
+
+	/* parameter 2  */
+	pushl	%ebx
+	/* parameter 1  */
+	pushl	%eax
+
+	/* jump to C main function...  */
+	call	EXT_C(cmain)
+
+loop:	hlt
+	jmp	loop
+
+	.comm	stack, STACK_SIZE /* stack area.  */
diff --git a/util/extensions/legacybios/arch/x86/builtin.c b/util/extensions/legacybios/arch/x86/builtin.c
new file mode 100644
index 0000000000..10368ab630
--- /dev/null
+++ b/util/extensions/legacybios/arch/x86/builtin.c
@@ -0,0 +1,27 @@
+/* 
+ * Copyright (C) 2003 Stefan Reinauer
+ *
+ * See the file "COPYING" for further information about
+ * the copyright and warranty status of this work.
+ */
+
+#include "config.h"
+#include "types.h"
+
+
+/*
+ * wrap an array around the hex'ed dictionary file
+ */
+
+static char romimage[] = {
+#include "rom.h"
+};
+
+void legacybios(ucell romstart, ucell romend);
+
+void cmain(void)
+{
+	legacybios((ucell) romimage,
+		 (ucell) romimage + sizeof(romimage));
+	return;
+}
diff --git a/util/extensions/legacybios/arch/x86/console.c b/util/extensions/legacybios/arch/x86/console.c
new file mode 100644
index 0000000000..3204922499
--- /dev/null
+++ b/util/extensions/legacybios/arch/x86/console.c
@@ -0,0 +1,395 @@
+/* small console implementation */
+/*
+ * Copyright (C) 2003 Stefan Reinauer
+ *
+ * See the file "COPYING" for further information about
+ * the copyright and warranty status of this work.
+ */
+
+#include <string.h>
+
+#include <config.h>
+#include <types.h>
+#include <io.h>
+#ifdef DEBUG_CONSOLE
+
+/* ******************************************************************
+ *                       serial console functions
+ * ****************************************************************** */
+
+#ifdef DEBUG_CONSOLE_SERIAL
+
+#define RBR(x)  x==2?0x2f8:0x3f8
+#define THR(x)  x==2?0x2f8:0x3f8
+#define IER(x)  x==2?0x2f9:0x3f9
+#define IIR(x)  x==2?0x2fa:0x3fa
+#define LCR(x)  x==2?0x2fb:0x3fb
+#define MCR(x)  x==2?0x2fc:0x3fc
+#define LSR(x)  x==2?0x2fd:0x3fd
+#define MSR(x)  x==2?0x2fe:0x3fe
+#define SCR(x)  x==2?0x2ff:0x3ff
+#define DLL(x)  x==2?0x2f8:0x3f8
+#define DLM(x)  x==2?0x2f9:0x3f9
+
+static int uart_charav(int port)
+{
+	if (!port)
+		return -1;
+	return ((inb(LSR(port)) & 1) != 0);
+}
+
+static char uart_getchar(int port)
+{
+	if (!port)
+		return -1;
+	while (!uart_charav(port));
+	return ((char) inb(RBR(port)) & 0177);
+}
+
+static void uart_putchar(int port, unsigned char c)
+{
+	if (!port)
+		return;
+	if (c == '\n')
+		uart_putchar(port, '\r');
+	while (!(inb(LSR(port)) & 0x20));
+	outb(THR(port), c);
+}
+
+static void uart_init_line(int port, unsigned long baud)
+{
+	int i, baudconst;
+
+	if (!port)
+		return;
+
+	switch (baud) {
+	case 115200:
+		baudconst = 1;
+		break;
+	case 57600:
+		baudconst = 2;
+		break;
+	case 38400:
+		baudconst = 3;
+		break;
+	case 19200:
+		baudconst = 6;
+		break;
+	case 9600:
+	default:
+		baudconst = 12;
+		break;
+	}
+
+	outb(LCR(port), 0x87);
+	outb(DLM(port), 0);
+	outb(DLL(port), baudconst);
+	outb(LCR(port), 0x07);
+	outb(MCR(port), 0x0f);
+
+	for (i = 10; i > 0; i--) {
+		if (inb(LSR(port)) == (unsigned int) 0)
+			break;
+		inb(RBR(port));
+	}
+}
+
+int uart_init(int port, unsigned long speed)
+{
+	if (port)
+		uart_init_line(port, speed);
+	return -1;
+}
+
+static void serial_putchar(int c)
+{
+	uart_putchar(SERIAL_PORT, (unsigned char) (c & 0xff));
+}
+
+static void serial_cls(void)
+{
+	serial_putchar(27);
+	serial_putchar('[');
+	serial_putchar('H');
+	serial_putchar(27);
+	serial_putchar('[');
+	serial_putchar('J');
+}
+
+#endif
+
+/* ******************************************************************
+ *          simple polling video/keyboard console functions
+ * ****************************************************************** */
+
+#ifdef DEBUG_CONSOLE_VGA
+
+/* raw vga text mode */
+#define COLUMNS			80	/* The number of columns.  */
+#define LINES			25	/* The number of lines.  */
+#define ATTRIBUTE		7	/* The attribute of an character.  */
+
+#define VGA_BASE		0xB8000	/* The video memory address.  */
+
+/* VGA Index and Data Registers */
+#define VGA_REG_INDEX    0x03D4	    /* VGA index register */
+#define VGA_REG_DATA     0x03D5     /* VGA data register */
+
+#define VGA_IDX_CURMSL   0x09       /* cursor maximum scan line */
+#define VGA_IDX_CURSTART 0x0A       /* cursor start */
+#define VGA_IDX_CUREND   0x0B       /* cursor end */
+#define VGA_IDX_CURLO    0x0F       /* cursor position (low 8 bits)*/
+#define VGA_IDX_CURHI    0x0E       /* cursor position (high 8 bits) */
+
+/* Save the X and Y position.  */
+static int xpos, ypos;
+/* Point to the video memory.  */
+static volatile unsigned char *const video = (unsigned char *) VGA_BASE;
+
+static void video_initcursor(void)
+{
+	u8 val;
+	outb(VGA_REG_INDEX, VGA_IDX_CURMSL);
+	val = inb(VGA_REG_DATA) & 0x1f; /* maximum scan line -1 */
+	
+	outb(VGA_REG_INDEX, VGA_IDX_CURSTART);
+	outb(VGA_REG_DATA, 0);
+
+	outb(VGA_REG_INDEX, VGA_IDX_CUREND);
+	outb(VGA_REG_DATA, val);
+}
+
+
+
+static void video_poscursor(unsigned int x, unsigned int y)
+{
+	unsigned short pos;
+
+	/* Calculate new cursor position as a function of x and y */
+	pos = (y*COLUMNS) + x;
+
+	/* Output the new position to VGA card */
+	outb(VGA_REG_INDEX, VGA_IDX_CURLO);   /* output low 8 bits */
+	outb(VGA_REG_DATA,  (u8) (pos));
+	outb(VGA_REG_INDEX, VGA_IDX_CURHI);   /* output high 8 bits */
+	outb(VGA_REG_DATA,  (u8) (pos >> 8));
+
+};
+
+
+static void video_newline(void)
+{
+	xpos = 0;
+
+	if (ypos < LINES-1) {
+		ypos++;
+	} else {
+		int i;
+		memmove((void *)video, (void *)(video+2*COLUMNS), (LINES-1)*COLUMNS*2);
+
+		for(i=( (LINES-1) *2*COLUMNS ); i<2*COLUMNS*LINES;) {
+			video[i++]=0;
+			video[i++]=ATTRIBUTE;
+		}
+	}
+
+}
+
+/* Put the character C on the screen.  */
+static void video_putchar(int c)
+{
+	if (c == '\n' || c == '\r') {
+		video_newline();
+		return;
+	}
+
+	if (xpos >= COLUMNS)
+		video_newline();
+
+	*(video + (xpos + ypos * COLUMNS) * 2) = c & 0xFF;
+	*(video + (xpos + ypos * COLUMNS) * 2 + 1) = ATTRIBUTE;
+
+	xpos++;
+
+	video_poscursor(xpos, ypos);
+}
+
+static void video_cls(void)
+{	
+	int i;
+	for(i=0; i<2*COLUMNS*LINES;) {
+		video[i++]=0;
+		video[i++]=ATTRIBUTE;
+	}
+
+
+	xpos = 0; ypos = 0;
+
+	video_initcursor();
+	video_poscursor(xpos,ypos);
+}
+
+/*
+ *  keyboard driver
+ */
+
+static char normal[] = {
+	0x0, 0x1b, '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '-',
+	'=', '\b', '\t', 'q', 'w', 'e', 'r', 't', 'y', 'u', 'i', 'o',
+	'p', '[', ']', 0xa, 0x0, 'a', 's', 'd', 'f', 'g', 'h', 'j',
+	'k', 'l', ';', 0x27, 0x60, 0x0, 0x5c, 'z', 'x', 'c', 'v', 'b',
+	'n', 'm', ',', '.', '/', 0x0, '*', 0x0, ' ', 0x0, 0x0, 0x0,
+	0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
+	0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, '0', 0x7f
+};
+
+static char shifted[] = {
+	0x0, 0x1b, '!', '@', '#', '$', '%', '^', '&', '*', '(', ')', '_',
+	'+', '\b', '\t', 'Q', 'W', 'E', 'R', 'T', 'Y', 'U', 'I', 'O',
+	'P', '{', '}', 0xa, 0x0, 'A', 'S', 'D', 'F', 'G', 'H', 'J',
+	'K', 'L', ':', 0x22, '~', 0x0, '|', 'Z', 'X', 'C', 'V', 'B',
+	'N', 'M', '<', '>', '?', 0x0, '*', 0x0, ' ', 0x0, 0x0, 0x0,
+	0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, '7', '8',
+	'9', 0x0, '4', '5', '6', 0x0, '1', '2', '3', '0', 0x7f
+};
+
+static int key_ext;
+static int key_lshift = 0, key_rshift = 0, key_caps = 0;
+
+static char last_key;
+
+static void keyboard_cmd(unsigned char cmd, unsigned char val)
+{
+	outb(0x60, cmd);
+	/* wait until keyboard controller accepts cmds: */
+	while (inb(0x64) & 2);
+	outb(0x60, val);
+	while (inb(0x64) & 2);
+}
+
+static char keyboard_poll(void)
+{
+	unsigned int c;
+	if (inb(0x64) & 1) {
+		c = inb(0x60);
+		switch (c) {
+		case 0xe0:
+			key_ext = 1;
+			return 0;
+		case 0x2a:
+			key_lshift = 1;
+			return 0;
+		case 0x36:
+			key_rshift = 1;
+			return 0;
+		case 0xaa:
+			key_lshift = 0;
+			return 0;
+		case 0xb6:
+			key_rshift = 0;
+			return 0;
+		case 0x3a:
+			if (key_caps) {
+				key_caps = 0;
+				keyboard_cmd(0xed, 0);
+			} else {
+				key_caps = 1;
+				keyboard_cmd(0xed, 4);	/* set caps led */
+			}
+			return 0;
+		}
+
+		if (key_ext) {
+			void printk(const char *format, ...);
+			printk("extended keycode: %x\n", c);
+
+			key_ext = 0;
+			return 0;
+		}
+
+		if (c & 0x80)	/* unhandled key release */
+			return 0;
+
+		if (key_lshift || key_rshift)
+			return key_caps ? normal[c] : shifted[c];
+		else
+			return key_caps ? shifted[c] : normal[c];
+	}
+	return 0;
+}
+
+static int keyboard_dataready(void)
+{
+	if (last_key)
+		return 1;
+
+	last_key = keyboard_poll();
+
+	return (last_key != 0);
+}
+
+static unsigned char keyboard_readdata(void)
+{
+	char tmp;
+	while (!keyboard_dataready());
+	tmp = last_key;
+	last_key = 0;
+	return tmp;
+}
+#endif
+
+
+/* ******************************************************************
+ *      common functions, implementing simple concurrent console
+ * ****************************************************************** */
+
+int putchar(int c)
+{
+#ifdef DEBUG_CONSOLE_SERIAL
+	serial_putchar(c);
+#endif
+#ifdef DEBUG_CONSOLE_VGA
+	video_putchar(c);
+#endif
+	return c;
+}
+
+int availchar(void)
+{
+#ifdef DEBUG_CONSOLE_SERIAL
+	if (uart_charav(SERIAL_PORT))
+		return 1;
+#endif
+#ifdef DEBUG_CONSOLE_VGA
+	if (keyboard_dataready())
+		return 1;
+#endif
+	return 0;
+}
+
+int getchar(void)
+{
+#ifdef DEBUG_CONSOLE_SERIAL
+	if (uart_charav(SERIAL_PORT))
+		return (uart_getchar(SERIAL_PORT));
+#endif
+#ifdef DEBUG_CONSOLE_VGA
+	if (keyboard_dataready())
+		return (keyboard_readdata());
+#endif
+	return 0;
+}
+
+void cls(void)
+{
+#ifdef DEBUG_CONSOLE_SERIAL
+	serial_cls();
+#endif
+#ifdef DEBUG_CONSOLE_VGA
+	video_cls();
+#endif
+}
+
+
+#endif				// DEBUG_CONSOLE
diff --git a/util/extensions/legacybios/arch/x86/include/io.h b/util/extensions/legacybios/arch/x86/include/io.h
new file mode 100644
index 0000000000..fd78334a7a
--- /dev/null
+++ b/util/extensions/legacybios/arch/x86/include/io.h
@@ -0,0 +1,55 @@
+/* I/O implementation
+ *
+ * Copyright (C) 2003 Stefan Reinauer
+ *
+ * See the file "COPYING" for further information about
+ * the copyright and warranty status of this work.
+ * 
+ * this code is inspired by the linux kernel
+ *
+ */
+
+#ifndef IO_H
+#define IO_H
+
+#include <types.h>
+
+#define __EXTERN__ extern
+
+__EXTERN__ inline u8 inb(u32 port)
+{
+	u8 result;
+	__asm__ __volatile__ ( "inb %w1,%0" :"=a" (result) :"Nd" (port));
+	return result;
+}
+
+__EXTERN__ inline u16 inw(u32 port)
+{
+	u16 result;
+	__asm__ __volatile__ ( "inw %w1,%0" :"=a" (result) :"Nd" (port));
+	return result;
+}
+
+__EXTERN__ inline u32 inl(u32 port)
+{
+	u32 result;
+	__asm__ __volatile__ ( "inl %w1,%0" :"=a" (result) :"Nd" (port));
+	return result;
+}
+
+__EXTERN__ inline void outb (u32 port, u8 value)
+{
+	__asm__ __volatile__ ( "outb %b0,%w1" : :"a" (value), "Nd" (port));
+}
+
+__EXTERN__ inline void outw (u32 port, u16 value)
+{
+	__asm__ __volatile__ ( "outw %w0,%w1" : :"a" (value), "Nd" (port));
+}
+
+__EXTERN__ inline void outl (u32 port, u32 value)
+{
+	__asm__ __volatile__ ( "outl %0,%w1" : :"a" (value), "Nd" (port));
+}
+
+#endif /* IO_H */
diff --git a/util/extensions/legacybios/arch/x86/include/multiboot.h b/util/extensions/legacybios/arch/x86/include/multiboot.h
new file mode 100644
index 0000000000..4027035793
--- /dev/null
+++ b/util/extensions/legacybios/arch/x86/include/multiboot.h
@@ -0,0 +1,96 @@
+/* multiboot.h 
+ * header for multiboot 
+ *
+ * Copyright (C) 2003 Stefan Reinauer
+ *
+ * See the file "COPYING" for further information about
+ * the copyright and warranty status of this work.
+ */
+
+/* magic number for multiboot header */
+#define MULTIBOOT_HEADER_MAGIC		0x1BADB002
+
+/* flags for multiboot header */
+#define MULTIBOOT_HEADER_FLAGS		0x00010003
+
+/* magic number passed by multiboot-compliant boot loader.  */
+#define MULTIBOOT_BOOTLOADER_MAGIC	0x2BADB002
+
+/* The size of our stack (8KB).  */
+#define STACK_SIZE			0x2000
+
+/* C symbol format. HAVE_ASM_USCORE is defined by configure.  */
+#ifdef HAVE_ASM_USCORE
+# define EXT_C(sym)			_ ## sym
+#else
+# define EXT_C(sym)			sym
+#endif
+
+#ifndef ASM
+/* We don't want these declarations in boot.S  */
+
+/* multiboot header */
+typedef struct multiboot_header {
+	unsigned long magic;
+	unsigned long flags;
+	unsigned long checksum;
+	unsigned long header_addr;
+	unsigned long load_addr;
+	unsigned long load_end_addr;
+	unsigned long bss_end_addr;
+	unsigned long entry_addr;
+} multiboot_header_t;
+
+/* symbol table for a.out */
+typedef struct aout_symbol_table {
+	unsigned long tabsize;
+	unsigned long strsize;
+	unsigned long addr;
+	unsigned long reserved;
+} aout_symbol_table_t;
+
+/* section header table for ELF */
+typedef struct elf_section_header_table {
+	unsigned long num;
+	unsigned long size;
+	unsigned long addr;
+	unsigned long shndx;
+} elf_section_header_table_t;
+
+/* multiboot information */
+typedef struct multiboot_info {
+	unsigned long flags;
+	unsigned long mem_lower;
+	unsigned long mem_upper;
+	unsigned long boot_device;
+	unsigned long cmdline;
+	unsigned long mods_count;
+	unsigned long mods_addr;
+	union {
+		aout_symbol_table_t aout_sym;
+		elf_section_header_table_t elf_sec;
+	} u;
+	unsigned long mmap_length;
+	unsigned long mmap_addr;
+} multiboot_info_t;
+
+/* module structure */
+typedef struct module {
+	unsigned long mod_start;
+	unsigned long mod_end;
+	unsigned long string;
+	unsigned long reserved;
+} module_t;
+
+/* memory map. Be careful that the offset 0 is base_addr_low
+   but no size.  */
+typedef struct memory_map {
+	unsigned long size;
+	unsigned long base_addr_low;
+	unsigned long base_addr_high;
+	unsigned long length_low;
+	unsigned long length_high;
+	unsigned long type;
+} memory_map_t;
+
+#endif				/* ! ASM */
diff --git a/util/extensions/legacybios/arch/x86/mboot.S b/util/extensions/legacybios/arch/x86/mboot.S
new file mode 100644
index 0000000000..679bfcbc72
--- /dev/null
+++ b/util/extensions/legacybios/arch/x86/mboot.S
@@ -0,0 +1,57 @@
+/* mboot.S 
+ * legacybios assembler bootstrap for multiboot
+ *
+ * Copyright (C) 2003 Stefan Reinauer
+ *
+ * See the file "COPYING" for further information about
+ * the copyright and warranty status of this work.
+ */
+
+#define ASM 1
+#include <multiboot.h>
+	
+	.text
+
+	.code32
+	.globl	start, _start
+
+	/* unused */
+start:
+_start:
+	jmp	multiboot_entry
+
+	/* Align 32 bits boundary.  */
+	.align	4
+	
+	/* Multiboot header.  */
+multiboot_header:
+	.long	MULTIBOOT_HEADER_MAGIC /* magic */
+	.long	MULTIBOOT_HEADER_FLAGS /* flags */
+	.long	-(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS) 
+	        /* checksum */
+	.long	multiboot_header /* header_addr */
+	.long	_start /* load_addr */
+	.long	_edata /* load_end_addr */
+	.long	_end /* bss_end_addr */
+	.long	multiboot_entry /* entry_addr */
+
+multiboot_entry:
+	/* Initialize stack pointer.  */
+	movl	$(stack + STACK_SIZE), %esp
+
+	/* Reset EFLAGS.  */
+	pushl	$0
+	popf
+
+	/* pointer to multiboot information structure.  */
+	pushl	%ebx
+	/* magic value.  */
+	pushl	%eax
+
+	/* jump to C main function...  */
+	call	EXT_C(cmain)
+
+loop:	hlt
+	jmp	loop
+
+	.comm	stack, STACK_SIZE /* stack area.  */
diff --git a/util/extensions/legacybios/arch/x86/multiboot.c b/util/extensions/legacybios/arch/x86/multiboot.c
new file mode 100644
index 0000000000..a1793cf425
--- /dev/null
+++ b/util/extensions/legacybios/arch/x86/multiboot.c
@@ -0,0 +1,92 @@
+/*
+ * Copyright (C) 2003 Stefan Reinauer
+ *
+ * See the file "COPYING" for further information about
+ * the copyright and warranty status of this work.
+ */
+
+#include "config.h"
+#include "types.h"
+#include "multiboot.h"
+
+/* Multiboot: Check if the bit BIT in FLAGS is set.  */
+#define CHECK_FLAG(flags,bit)	((flags) & (1 << (bit)))
+
+#ifdef DEBUG_CONSOLE
+void cls(void);
+void printk(const char *fmt, ...);
+int uart_init(int port, unsigned long speed);
+#endif
+
+void legacybios(ucell romstart, ucell romend);
+
+/* Check if MAGIC is valid and print the Multiboot information structure
+   pointed by ADDR.  */
+
+void cmain(unsigned long magic, unsigned long addr)
+{
+	multiboot_info_t *mbi;
+
+#ifdef DEBUG_CONSOLE
+	uart_init(SERIAL_PORT, SERIAL_SPEED);
+	/* Clear the screen.  */
+	cls();
+#endif
+
+	/* Am I booted by a Multiboot-compliant boot loader?  */
+	if (magic != MULTIBOOT_BOOTLOADER_MAGIC) {
+		printk("legacybios: loader not multiboot capable\n");
+		return;
+	}
+
+	/* Set MBI to the address of the Multiboot information structure.  */
+	mbi = (multiboot_info_t *) addr;
+
+#ifdef DEBUG_BOOT
+	/* Print out the flags.  */
+	printk("flags = 0x%x\n", mbi->flags);
+
+	/* Are mem_* valid?  */
+	if (CHECK_FLAG(mbi->flags, 0))
+		printk("mem_lower = %dKB, mem_upper = %dKB\n",
+		       mbi->mem_lower, mbi->mem_upper);
+
+	/* Is boot_device valid?  */
+	if (CHECK_FLAG(mbi->flags, 1))
+		printk("boot_device = 0x%x\n", mbi->boot_device);
+
+	/* Is the command line passed?  */
+	if (CHECK_FLAG(mbi->flags, 2))
+		printk("cmdline = %s\n", (char *) mbi->cmdline);
+#endif
+
+#ifdef DEBUG_BOOT
+	/* Bits 4 and 5 are mutually exclusive!  */
+	if (CHECK_FLAG(mbi->flags, 4) && CHECK_FLAG(mbi->flags, 5)) {
+		printk("panic: binary claims to be a.out and elf.\n");
+		return;
+	}
+#endif
+
+	/* Are mods_* valid?  */
+	if (CHECK_FLAG(mbi->flags, 3)) {
+		module_t *mod;
+		unsigned int i;
+#ifdef DEBUG_BOOT
+		printk("mods_count = %d, mods_addr = 0x%x\n",
+		       mbi->mods_count, mbi->mods_addr);
+#endif
+		for (i = 0, mod = (module_t *) mbi->mods_addr;
+		     i < mbi->mods_count; i++, mod += sizeof(module_t)) {
+			legacybios(mod->mod_start,  mod->mod_end);
+#ifdef DEBUG_BOOT
+			printk
+			    (" mod_start = 0x%x, mod_end = 0x%x, string = %s\n",
+			     mod->mod_start, mod->mod_end,
+			     (char *) mod->string);
+#endif
+		}
+	}
+
+	return;
+}
diff --git a/util/extensions/legacybios/arch/x86/pci.c b/util/extensions/legacybios/arch/x86/pci.c
new file mode 100644
index 0000000000..3fff076564
--- /dev/null
+++ b/util/extensions/legacybios/arch/x86/pci.c
@@ -0,0 +1,126 @@
+#include <stdio.h>
+#include <io.h>
+#include <pci.h>
+
+void *malloc(unsigned int size);
+void *memset(void *s, int c, size_t count);
+
+#define CONFIG_CMD(dev, where)   (0x80000000 | (dev->bus << 16) | (dev->devfn << 8) | (where & ~3))
+
+static struct pci_dev *pcidevices = NULL;
+
+struct pci_dev *pci_find_device(unsigned int vendor, unsigned int device,
+				struct pci_dev *from)
+{
+	struct pci_dev *curr = from ? from : pcidevices;
+
+	while (curr) {
+		if (curr->vendor == vendor && curr->device == device)
+			return curr;
+		curr = curr->next;
+	}
+	return NULL;
+}
+
+struct pci_dev *pci_find_slot(unsigned int bus, unsigned int devfn)
+{
+	struct pci_dev *curr = pcidevices;
+
+	while (curr) {
+		if (curr->devfn == devfn && curr->bus == bus)
+			return curr;
+		curr = curr->next;
+	}
+	return NULL;
+}
+
+int pci_read_config_byte(struct pci_dev *dev, u8 where, u8 * val)
+{
+	outl(0xcf8, CONFIG_CMD(dev, where));
+	*val = inb(0xCFC + (where & 3));
+	return 0;
+}
+
+int pci_read_config_word(struct pci_dev *dev, u8 where, u16 * val)
+{
+	outl(0xcf8, CONFIG_CMD(dev, where));
+	*val = inb(0xCFC + (where & 2));
+	return 0;
+}
+
+int pci_read_config_dword(struct pci_dev *dev, u8 where, u32 * val)
+{
+	outl(0xcf8, CONFIG_CMD(dev, where));
+	*val = inb(0xCFC);
+	return 0;
+}
+
+int pci_write_config_byte(struct pci_dev *dev, u8 where, u8 val)
+{
+	outl(0xcf8, CONFIG_CMD(dev, where));
+	outb(0xCFC + (where & 3), val);
+	return 0;
+}
+
+int pci_write_config_word(struct pci_dev *dev, u8 where, u16 val)
+{
+	outl(0xcf8, CONFIG_CMD(dev, where));
+	outb(0xCFC + (where & 2), val);
+	return 0;
+}
+
+int pci_write_config_dword(struct pci_dev *dev, u8 where, u32 val)
+{
+	outl(0xcf8, CONFIG_CMD(dev, where));
+	outb(0xCFC, where);
+	return 0;
+}
+
+#define FUNC(x) ((x) & 7)
+#define SLOT(x) ((x) >> 3)
+#define MAX_DEV (20 << 3)
+
+void pci_init(void)
+{
+	struct pci_dev *pdev, **p, current;
+	int dev, bus = 0, multi = 0;
+
+	pcidevices = NULL;
+
+	for (dev = 0; dev < MAX_DEV; dev++) {
+		u16 vendor, device;
+
+		if (!multi && FUNC(dev))
+			continue;
+
+		current.bus = bus;	// FIXME
+		current.devfn = dev;
+
+		pci_read_config_word(&current, PCI_VENDOR_ID, &vendor);
+		pci_read_config_word(&current, PCI_DEVICE_ID, &device);
+
+		if (vendor == 0xffff || vendor == 0x0000 ||
+		    device == 0xffff || device == 0x0000)
+			continue;
+
+		pdev = malloc(sizeof(*pdev));
+		memset(pdev, 0, sizeof(*pdev));
+
+		pdev->vendor = vendor;
+		pdev->device = device;
+		pdev->bus = current.bus;
+
+		pci_read_config_byte(pdev, PCI_HEADER_TYPE, &(pdev->header));
+		pci_read_config_word(pdev, PCI_COMMAND, &(pdev->command));
+		pci_read_config_byte(pdev, PCI_CLASS_PROG, &(pdev->progif));
+		pci_read_config_word(pdev, PCI_CLASS_DEVICE, &(pdev->class));
+		pdev->devfn = dev;
+
+		multi = pdev->header & 0x80;
+		for (p = &pcidevices; *p; p = &(*p)->next);
+		*p = pdev;
+
+	}
+
+
+}
diff --git a/util/extensions/legacybios/arch/x86/plainboot.c b/util/extensions/legacybios/arch/x86/plainboot.c
new file mode 100644
index 0000000000..b43cc720e2
--- /dev/null
+++ b/util/extensions/legacybios/arch/x86/plainboot.c
@@ -0,0 +1,21 @@
+/* tag: legacybios starter
+ *
+ * Copyright (C) 2003 Stefan Reinauer
+ *
+ * See the file "COPYING" for further information about
+ * the copyright and warranty status of this work.
+ */
+
+#include "config.h"
+#include "types.h"
+
+#define FIXED_ROMSTART 0xc0000
+#define FIXED_ROMEND   0xcffff
+
+void legacybios(ucell romstart, ucell romend);
+
+void cmain(void)
+{
+	legacybios(FIXED_ROMSTART,FIXED_ROMEND);
+	return;
+}