* Patch by Daniel Engström, 13 Nov 2002:

  Add support for i386 architecture and AMD SC520 board

* Patch by Pierre Aubert, 12 Nov 2002:
  Add support for DOS filesystem and booting from DOS floppy disk

3 files changed, 1320 insertions, 0 deletions

diff --git a/lib_i386/ic/ali512x.c b/lib_i386/ic/ali512x.c
new file mode 100644
index 0000000..4537095
--- /dev/null
+++ b/lib_i386/ic/ali512x.c
@@ -0,0 +1,442 @@
+/*
+ * (C) Copyright 2002
+ * Daniel Engström, Omicron Ceti AB <daniel@omicron.se>.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+/*
+ * Based on sc520cdp.c from rolo 1.6:
+ *----------------------------------------------------------------------
+ * (C) Copyright 2000
+ * Sysgo Real-Time Solutions GmbH
+ * Klein-Winternheim, Germany
+ *----------------------------------------------------------------------
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/ic/ali512x.h>
+
+
+/* ALI M5123 Logical device numbers:
+ * 0 FDC
+ * 1 unused?
+ * 2 unused?
+ * 3 lpt
+ * 4 UART1
+ * 5 UART2
+ * 6 RTC
+ * 7 mouse/kbd
+ * 8 CIO
+ */
+
+/*
+ ************************************************************
+ *  Some access primitives for the ALi chip:                *
+ ************************************************************
+ */
+
+static void ali_write(u8 index, u8 value)
+{	
+	/* write an arbirary register */
+	outb(index, ALI_INDEX);
+	outb(value, ALI_DATA);
+}
+
+static int ali_read(u8 index)
+{
+	outb(index, ALI_INDEX);
+	return inb(ALI_DATA);
+}
+
+#define ALI_OPEN() \
+	outb(0x51, ALI_DATA); \
+	outb(0x23, ALI_DATA)	
+
+
+#define ALI_CLOSE() \
+	outb(0xbb, ALI_DATA)
+
+/* Select a logical device */
+#define ALI_SELDEV(dev)	\
+	ali_write(0x07, dev)	
+
+
+void ali512x_init(void)
+{
+	ALI_OPEN();
+
+	ali_write(0x02, 0x01);	/* soft reset */
+	ali_write(0x03, 0x03);	/* disable access to CIOs */
+	ali_write(0x22, 0x00);	/* disable direct powerdown */
+	ali_write(0x23, 0x00);	/* disable auto powerdown */
+	ali_write(0x24, 0x00);	/* IR 8 is active hi, pin26 is PDIR */
+
+	ALI_CLOSE();
+}
+
+void ali512x_set_fdc(int enabled, u16 io, u8 irq, u8 dma_channel)
+{
+	ALI_OPEN();
+	ALI_SELDEV(0);
+	
+	ali_write(0x30, enabled?1:0);
+	if (enabled) {
+		ali_write(0x60, io >> 8);
+		ali_write(0x61, io & 0xff);
+		ali_write(0x70, irq);
+		ali_write(0x74, dma_channel);
+		
+		/* AT mode, no drive swap */
+		ali_write(0xf0, 0x08);
+		ali_write(0xf1, 0x00);
+		ali_write(0xf2, 0xff);
+		ali_write(0xf4, 0x00);
+	}
+	ALI_CLOSE();
+}
+
+
+void ali512x_set_pp(int enabled, u16 io, u8 irq, u8 dma_channel)
+{
+	ALI_OPEN();
+	ALI_SELDEV(3);
+	
+	ali_write(0x30, enabled?1:0);
+	if (enabled) {
+		ali_write(0x60, io >> 8);
+		ali_write(0x61, io & 0xff);
+		ali_write(0x70, irq);
+		ali_write(0x74, dma_channel);
+		
+		/* mode: EPP 1.9, ECP FIFO threshold = 7, IRQ active low */
+		ali_write(0xf0, 0xbc);
+		/* 12 MHz, Burst DMA in ECP */
+		ali_write(0xf1, 0x05);
+	}
+	ALI_CLOSE();
+
+}
+
+void ali512x_set_uart(int enabled, int index, u16 io, u8 irq)
+{
+	ALI_OPEN();
+	ALI_SELDEV(index?5:4);
+	
+	ali_write(0x30, enabled?1:0);
+	if (enabled) {
+		ali_write(0x60, io >> 8);
+		ali_write(0x61, io & 0xff);
+		ali_write(0x70, irq);
+		
+		ali_write(0xf0, 0x00);
+		ali_write(0xf1, 0x00);
+		
+		/* huh? write 0xf2 twice - a typo in rolo
+		 * or some secret ali errata? Who knows? 
+		 */
+		if (index) {
+			ali_write(0xf2, 0x00);
+		}
+		ali_write(0xf2, 0x0c);
+	}
+	ALI_CLOSE();
+
+}
+
+void ali512x_set_uart2_irda(int enabled)
+{
+	ALI_OPEN();
+	ALI_SELDEV(5);
+	
+	ali_write(0xf1, enabled?0x48:0x00); /* fullduplex IrDa */
+	ALI_CLOSE();
+
+}
+
+void ali512x_set_rtc(int enabled, u16 io, u8 irq)
+{
+	ALI_OPEN();
+	ALI_SELDEV(6);
+	
+	ali_write(0x30, enabled?1:0);
+	if (enabled) {
+		ali_write(0x60, io >> 8);
+		ali_write(0x61, io & 0xff);
+		ali_write(0x70, irq);
+
+		ali_write(0xf0, 0x00);
+	}
+	ALI_CLOSE();
+}
+
+void ali512x_set_kbc(int enabled, u8 kbc_irq, u8 mouse_irq)
+{
+	ALI_OPEN();
+	ALI_SELDEV(7);
+	
+	ali_write(0x30, enabled?1:0);
+	if (enabled) {
+		ali_write(0x70, kbc_irq);
+		ali_write(0x72, mouse_irq);		
+		
+		ali_write(0xf0, 0x00);
+	}
+	ALI_CLOSE();
+}
+
+
+/* Common I/O
+ * 
+ * (This descripotsion is base on several incompete sources
+ *  since I have not been able to obtain any datasheet for the device
+ *  there may be some mis-understandings burried in here. 
+ *  -- Daniel daniel@omicron.se)
+ * 
+ * There are 22 CIO pins numbered
+ * 10-17
+ * 20-25
+ * 30-37
+ * 
+ * 20-24 are dedicated CIO pins, the other 17 are muliplexed with
+ * other functions.
+ * 
+ *           Secondary 
+ * CIO Pin   Function    Decription
+ * =======================================================
+ * CIO10     IRQIN1      Interrupt input 1?
+ * CIO11     IRQIN2      Interrupt input 2?
+ * CIO12     IRRX        IrDa Receive
+ * CIO13     IRTX        IrDa Transmit
+ * CIO14     P21         KBC P21 fucntion
+ * CIO15     P20         KBC P21 fucntion
+ * CIO16     I2C_CLK     I2C Clock
+ * CIO17     I2C_DAT     I2C Data
+ * 
+ * CIO20     -
+ * CIO21     -
+ * CIO22     -
+ * CIO23     -
+ * CIO24     -
+ * CIO25     LOCK        Keylock
+ * 
+ * CIO30     KBC_CLK     Keybaord Clock
+ * CIO31     CS0J        General Chip Select decoder CS0J
+ * CIO32     CS1J        General Chip Select decoder CS1J
+ * CIO33     ALT_KCLK    Alternative Keyboard Clock
+ * CIO34     ALT_KDAT    Alternative Keyboard Data
+ * CIO35     ALT_MCLK    Alternative Mouse Clock
+ * CIO36     ALT_MDAT    Alternative Mouse Data
+ * CIO37     ALT_KBC     Alternative KBC select
+ *
+ * The CIO use a double indirect address scheme. 
+ * 
+ * Reigster 3 in the SIO is used to selectg where the CIO 
+ * I/O registers show up under function 8. Note that these
+ * registers clash with the CIO function select regsters,
+ * below.
+ * 
+ * SIO reigster 3 (CIO Address Selection) bit definitions:
+ * bit 7   CIO data register enabled
+ * bit 1-0 CIO indirect registers select
+ *     	 0  index = 0xE0 data = 0xE1
+ *       1  index = 0xE2 data = 0xE3
+ *       2  index = 0xE4 data = 0xE5
+ *       3  index = 0xEA data = 0xEB
+ * 
+ * There are three CIO I/O register accessed via CIO index and CIO data
+ * 0x01     CIO 10-17 data
+ * 0x02     CIO 20-25 data (bits 7-6 unused)
+ * 0x03     CIO 30-37 data
+ * 
+ * 
+ * The pin function is accessed through normal 
+ * SIO registers, each register have the same format:
+ * 
+ * Bit   Function                     Value
+ * 0     Input/output                 1=input 
+ * 1     Polarity of signal           1=inverted
+ * 2     Unused                       ??
+ * 3     Function (normal or special) 1=special
+ * 7-4   Unused
+ * 
+ * SIO REG
+ * 0xe0     CIO 10 Config
+ * 0xe1     CIO 11 Config
+ * 0xe2     CIO 12 Config
+ * 0xe3     CIO 13 Config
+ * 0xe4     CIO 14 Config
+ * 0xe5     CIO 15 Config
+ * 0xe6     CIO 16 Config
+ * 0xe7     CIO 16 Config
+ *
+ * 0xe8     CIO 20 Config
+ * 0xe9     CIO 21 Config
+ * 0xea     CIO 22 Config
+ * 0xeb     CIO 23 Config
+ * 0xec     CIO 24 Config
+ * 0xed     CIO 25 Config
+ *
+ * 0xf5     CIO 30 Config
+ * 0xf6     CIO 31 Config
+ * 0xf7     CIO 32 Config
+ * 0xf8     CIO 33 Config
+ * 0xf9     CIO 34 Config
+ * 0xfa     CIO 35 Config
+ * 0xfb     CIO 36 Config
+ * 0xfc     CIO 37 Config
+ * 
+ */
+
+void ali512x_set_cio(int enabled)
+{
+	int i;
+	
+	ALI_OPEN();
+	ali_write(0x3, 3);    /* Disable CIO data register */
+	
+	ALI_SELDEV(8);
+	ali_write(0x30, enabled?1:0);
+	
+	/* set all pins to input to start with */
+	for (i=0xe0;i<0xee;i++) {
+		ali_write(i, 1);
+	}
+	for (i=0xf5;i<0xfe;i++) {
+		ali_write(i, 1);
+	}
+			
+	ALI_CLOSE();
+}
+
+void ali512x_cio_function(int pin, int special, int inv, int input)
+{
+	u8 data;
+	u8 addr;
+	
+	
+	/* valid pins are 10-17, 20-25 and 30-37 */
+	if (pin >= 10 && pin <= 17) { 
+		addr = 0xe0+(pin-10);
+	} else if (pin >= 20 && pin <= 25) {
+		addr = 0xe8+(pin-20);
+	} else if (pin >= 30 && pin <= 37) { 
+		addr = 0xf5+(pin-30);
+	} else {
+		return;
+	}
+	
+	ALI_OPEN();
+	ALI_SELDEV(8);
+	
+	ali_write(0x03, 0x03);    /* Disable CIO data register */
+	
+	data=0;
+	if (special) {
+		data |= 0x08;
+	} else {
+		if (inv) {
+			data |= 0x02;
+		}
+		if (input) {
+			data |= 0x01;
+		}
+	}
+	
+	ali_write(addr, data);
+	
+	ALI_CLOSE();
+}
+
+void ali512x_cio_out(int pin, int value) 
+{
+	u8 reg;
+	u8 data;
+	u8 bit;
+	
+	/* valid pins are 10-17, 20-25 and 30-37 */
+	if (pin >= 10 && pin <= 17) { 
+		reg = 1;
+		pin -= 10;
+	} else if (pin >= 20 && pin <= 25) {
+		reg = 2;
+		pin -= 20;
+	} else if (pin >= 30 && pin <= 37) { 
+		reg = 3;
+		pin -= 30;
+	} else {
+		return;
+	}
+	bit = 1 << pin;
+	
+	ALI_OPEN();
+	ALI_SELDEV(8);
+	
+	ali_write(0x03, 0x83);    /* Enable CIO data register, use data port at 0xea */
+	
+	ali_write(0xea, reg);     /* select I/O register */
+	data = ali_read(0xeb);
+	if (value) {
+		data |= bit;
+	} else {
+		data &= ~bit;
+	}
+	ali_write(0xeb, data);
+	ali_write(0xea, 0);       /* select register 0 */
+	ali_write(0x03, 0x03);    /* Disable CIO data register */
+	ALI_CLOSE();
+}
+
+int ali512x_cio_in(int pin)
+{
+	u8 reg;
+	u8 data;
+	u8 bit;
+	
+	/* valid pins are 10-17, 20-25 and 30-37 */
+	if (pin >= 10 && pin <= 17) { 
+		reg = 1;
+		pin -= 10;
+	} else if (pin >= 20 && pin <= 25) {
+		reg = 2;
+		pin -= 20;
+	} else if (pin >= 30 && pin <= 37) { 
+		reg = 3;
+		pin -= 30;
+	} else {
+		return -1; 
+	}
+	bit = 1 << pin;
+	
+	ALI_OPEN();
+	ALI_SELDEV(8);
+	
+	ali_write(0x03, 0x83);    /* Enable CIO data register, use data port at 0xea */
+	
+	ali_write(0xea, reg);     /* select I/O register */
+	data = ali_read(0xeb);
+	ali_write(0xea, 0);       /* select register 0 */
+	ali_write(0x03, 0x03);    /* Disable CIO data register */
+	ALI_CLOSE();
+	
+	return data & bit; 
+}
+
+ 
diff --git a/lib_i386/ic/sc520.c b/lib_i386/ic/sc520.c
new file mode 100644
index 0000000..d202625
--- /dev/null
+++ b/lib_i386/ic/sc520.c
@@ -0,0 +1,348 @@
+/*
+ * (C) Copyright 2002
+ * Daniel Engström, Omicron Ceti AB <daniel@omicron.se>.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+/* stuff specific for the sc520,
+ * but idependent of implementation */
+
+
+#include <common.h>
+#include <config.h>
+#include <pci.h>
+#include <asm/io.h>
+#include <asm/pci.h>
+#include <asm/ic/sc520.h>
+
+/* 
+ * utility functions for boards based on the AMD sc520 
+ * 
+ * void write_mmcr_byte(u16 mmcr, u8 data)
+ * void write_mmcr_word(u16 mmcr, u16 data)
+ * void write_mmcr_long(u16 mmcr, u32 data)
+ * 
+ * u8   read_mmcr_byte(u16 mmcr)
+ * u16  read_mmcr_word(u16 mmcr)
+ * u32  read_mmcr_long(u16 mmcr)
+ * 
+ * void init_sc520(void)
+ * unsigned long init_sc520_dram(void)
+ * void pci_sc520_init(struct pci_controller *hose)
+ * 
+ * void reset_timer(void)
+ * ulong get_timer(ulong base)
+ * void set_timer(ulong t)
+ * void udelay(unsigned long usec)
+ * 
+ */
+
+static u32 mmcr_base= 0xfffef000;
+
+void write_mmcr_byte(u16 mmcr, u8 data)
+{
+	writeb(data, mmcr+mmcr_base);
+}
+
+void write_mmcr_word(u16 mmcr, u16 data)
+{
+	writew(data, mmcr+mmcr_base);	
+}
+
+void write_mmcr_long(u16 mmcr, u32 data)
+{
+	writel(data, mmcr+mmcr_base);
+}
+
+u8 read_mmcr_byte(u16 mmcr)
+{
+	return readb(mmcr+mmcr_base);
+}
+
+u16 read_mmcr_word(u16 mmcr)
+{
+	return readw(mmcr+mmcr_base);	
+}
+
+u32 read_mmcr_long(u16 mmcr)
+{
+	return readl(mmcr+mmcr_base);
+}
+
+
+void init_sc520(void)
+{
+	DECLARE_GLOBAL_DATA_PTR;
+	
+	/* Set the UARTxCTL register at it's slower,
+	 * baud clock giving us a 1.8432 MHz reference 
+	 */
+	write_mmcr_byte(SC520_UART1CTL, 7);
+	write_mmcr_byte(SC520_UART2CTL, 7);
+	
+	/* first set the timer pin mapping */
+	write_mmcr_byte(SC520_CLKSEL, 0x72);	/* no clock frequency selected, use 1.1892MHz */
+	
+	/* enable PCI bus arbitrer */
+	write_mmcr_byte(SC520_SYSARBCTL,0x02);  /* enable concurrent mode */
+	
+	write_mmcr_word(SC520_SYSARBMENB,0x1f); /* enable external grants */
+	write_mmcr_word(SC520_HBCTL,0x04);      /* enable posted-writes */
+
+
+	if (CFG_SC520_HIGH_SPEED) {
+		write_mmcr_byte(SC520_CPUCTL, 0x2);	/* set it to 133 MHz and write back */
+		gd->cpu_clk = 133000000;
+		printf("## CPU Speed set to 133MHz\n");
+	} else {
+		write_mmcr_byte(SC520_CPUCTL, 1);	/* set CPU to 100 MHz and write back cache */
+		printf("## CPU Speed set to 100MHz\n");
+		gd->cpu_clk = 100000000;
+	}
+	
+
+	/* wait at least one millisecond */
+        asm("movl	$0x2000,%%ecx\n"
+	    "wait_loop:	pushl %%ecx\n"
+	    "popl	%%ecx\n"
+	    "loop wait_loop\n": : : "ecx");
+
+	/* turn on the SDRAM write buffer */
+	write_mmcr_byte(SC520_DBCTL, 0x11);
+
+	/* turn on the cache and disable write through */
+	asm("movl	%%cr0, %%eax\n"
+	    "andl	$0x9fffffff, %%eax\n"
+	    "movl	%%eax, %%cr0\n"  : : : "eax");
+}
+
+unsigned long init_sc520_dram(void)
+{
+	DECLARE_GLOBAL_DATA_PTR;
+	bd_t *bd = gd->bd;
+	
+	u32 dram_present=0;
+	u32 dram_ctrl;
+
+	int val;
+	
+	int cas_precharge_delay = CFG_SDRAM_PRECHARGE_DELAY;	
+	int refresh_rate        = CFG_SDRAM_REFRESH_RATE;	
+	int ras_cas_delay       = CFG_SDRAM_RAS_CAS_DELAY;
+	
+	/* set SDRAM speed here */
+	
+	refresh_rate/=78;	
+	if (refresh_rate<=1) {
+		val = 0;  /* 7.8us */
+	} else if (refresh_rate==2) {
+		val = 1;  /* 15.6us */
+	} else if (refresh_rate==3 || refresh_rate==4) {
+		val = 2;  /* 31.2us */
+	} else {
+		val = 3;  /* 62.4us */
+	}
+	write_mmcr_byte(SC520_DRCCTL, (read_mmcr_byte(SC520_DRCCTL) & 0xcf) | (val<<4));
+	
+	val = read_mmcr_byte(SC520_DRCTMCTL);
+	val &= 0xf0;
+	
+	if (cas_precharge_delay==3) {		
+		val |= 0x04;   /* 3T */
+	} else if (cas_precharge_delay==4) {		
+		val |= 0x08;   /* 4T */
+	} else if (cas_precharge_delay>4) {		
+		val |= 0x0c;
+	} 
+	
+	if (ras_cas_delay > 3) {
+		val |= 2; 
+	} else {
+		val |= 1; 
+	}
+	write_mmcr_byte(SC520_DRCTMCTL, val);
+
+
+	/* We read-back the configuration of the dram
+	 * controller that the assembly code wrote */
+	dram_ctrl = read_mmcr_long(SC520_DRCBENDADR);
+	
+
+	bd->bi_dram[0].start = 0;
+	if (dram_ctrl & 0x80) {
+		/* bank 0 enabled */
+		dram_present = bd->bi_dram[1].start = (dram_ctrl & 0x7f) << 22;
+		bd->bi_dram[0].size = bd->bi_dram[1].start; 
+
+	} else {
+		bd->bi_dram[0].size = 0;
+		bd->bi_dram[1].start = bd->bi_dram[0].start;
+	}
+	
+	if (dram_ctrl & 0x8000) {
+		/* bank 1 enabled */
+		dram_present = bd->bi_dram[2].start = (dram_ctrl & 0x7f00) << 14;
+		bd->bi_dram[1].size = bd->bi_dram[2].start -  bd->bi_dram[1].start; 
+	} else {
+		bd->bi_dram[1].size = 0;
+		bd->bi_dram[2].start = bd->bi_dram[1].start;
+	}
+	
+	if (dram_ctrl & 0x800000) {
+		/* bank 2 enabled */
+		dram_present = bd->bi_dram[3].start = (dram_ctrl & 0x7f0000) << 6;
+		bd->bi_dram[2].size = bd->bi_dram[3].start -  bd->bi_dram[2].start; 
+	} else {
+		bd->bi_dram[2].size = 0;
+		bd->bi_dram[3].start = bd->bi_dram[2].start;
+	} 
+	
+	if (dram_ctrl & 0x80000000) {
+		/* bank 3 enabled */
+		dram_present  = (dram_ctrl & 0x7f000000) >> 2;
+		bd->bi_dram[3].size = dram_present -  bd->bi_dram[3].start;
+	} else {
+		bd->bi_dram[3].size = 0;
+	}
+
+	
+#if 0	
+	printf("Configured %d bytes of dram\n", dram_present);
+#endif	
+	gd->ram_size = dram_present;
+	
+	return dram_present;
+}
+
+
+#ifdef CONFIG_PCI
+
+
+
+void pci_sc520_init(struct pci_controller *hose)
+{
+	hose->first_busno = 0;
+	hose->last_busno = 0xff;
+
+	/* System memory space */
+	pci_set_region(hose->regions + 0, 
+		       SC520_PCI_MEMORY_BUS,
+		       SC520_PCI_MEMORY_PHYS,
+		       SC520_PCI_MEMORY_SIZE,
+		       PCI_REGION_MEM | PCI_REGION_MEMORY);
+
+	/* PCI memory space */
+	pci_set_region(hose->regions + 1, 
+		       SC520_PCI_MEM_BUS,
+		       SC520_PCI_MEM_PHYS,
+		       SC520_PCI_MEM_SIZE,
+		       PCI_REGION_MEM);
+
+	/* ISA/PCI memory space */
+	pci_set_region(hose->regions + 2, 
+		       SC520_ISA_MEM_BUS,
+		       SC520_ISA_MEM_PHYS,
+		       SC520_ISA_MEM_SIZE,
+		       PCI_REGION_MEM);
+
+	/* PCI I/O space */
+	pci_set_region(hose->regions + 3, 
+		       SC520_PCI_IO_BUS,
+		       SC520_PCI_IO_PHYS,
+		       SC520_PCI_IO_SIZE,
+		       PCI_REGION_IO);
+
+	/* ISA/PCI I/O space */
+	pci_set_region(hose->regions + 4, 
+		       SC520_ISA_IO_BUS,
+		       SC520_ISA_IO_PHYS,
+		       SC520_ISA_IO_SIZE,
+		       PCI_REGION_IO);
+
+	hose->region_count = 5;
+
+	pci_setup_type1(hose,
+			SC520_REG_ADDR,
+			SC520_REG_DATA);
+
+	pci_register_hose(hose);
+
+	hose->last_busno = pci_hose_scan(hose);
+	
+	/* enable target memory acceses on host brige */
+	pci_write_config_word(0, PCI_COMMAND, 
+			      PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER);
+
+}
+
+
+#endif
+
+#ifdef CFG_TIMER_SC520
+
+
+void reset_timer(void)
+{
+	write_mmcr_word(SC520_GPTMR0CNT, 0);
+	write_mmcr_word(SC520_GPTMR0CTL, 0x6001);
+	
+}
+
+ulong get_timer(ulong base)
+{
+	/* fixme: 30 or 33 */
+	return 	read_mmcr_word(SC520_GPTMR0CNT) / 33;
+}
+
+void set_timer(ulong t)
+{
+	/* FixMe: use two cascade coupled timers */
+	write_mmcr_word(SC520_GPTMR0CTL, 0x4001);
+	write_mmcr_word(SC520_GPTMR0CNT, t*33);
+	write_mmcr_word(SC520_GPTMR0CTL, 0x6001);
+}
+
+
+void udelay(unsigned long usec)
+{
+	int m=0;
+	long u;
+	
+	read_mmcr_word(SC520_SWTMRMILLI);
+	read_mmcr_word(SC520_SWTMRMICRO);
+	     
+#if 0
+	/* do not enable this line, udelay is used in the serial driver -> recursion */
+	printf("udelay: %ld m.u %d.%d  tm.tu %d.%d\n", usec, m, u, tm, tu);
+#endif	
+	while (1) {
+		
+		m += read_mmcr_word(SC520_SWTMRMILLI);
+		u = read_mmcr_word(SC520_SWTMRMICRO) + (m * 1000);
+		
+		if (usec <= u) {
+			break;
+		}
+	}
+}
+
+#endif
+
+
diff --git a/lib_i386/ic/sc520_asm.S b/lib_i386/ic/sc520_asm.S
new file mode 100644
index 0000000..72110c4
--- /dev/null
+++ b/lib_i386/ic/sc520_asm.S
@@ -0,0 +1,530 @@
+/*
+ * (C) Copyright 2002
+ * Daniel Engström, Omicron Ceti AB <daniel@omicron.se>.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+/* This file is largely based on code obtned from AMD. AMD's original
+ * copyright is included below 
+ */
+
+/*
+ *  =============================================================================
+ *                                                                              
+ *   Copyright 1999 Advanced Micro Devices, Inc.                                
+ *                                                                              
+ *  This software is the property of Advanced Micro Devices, Inc  (AMD)  which 
+ *  specifically grants the user the right to modify, use and distribute this 
+ *  software provided this COPYRIGHT NOTICE is not removed or altered.  All 
+ *  other rights are reserved by AMD.                                                       
+ *                                                                             
+ *  THE MATERIALS ARE PROVIDED "AS IS" WITHOUT ANY EXPRESS OR IMPLIED WARRANTY 
+ *  OF ANY KIND INCLUDING WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT OF 
+ *  THIRD-PARTY INTELLECTUAL PROPERTY, OR FITNESS FOR ANY PARTICULAR PURPOSE.
+ *  IN NO EVENT SHALL AMD OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER
+ *  (INCLUDING, WITHOUT LIMITATION, DAMAGES FOR LOSS OF PROFITS, BUSINESS
+ *  INTERRUPTION, LOSS OF INFORMAITON) ARISING OUT OF THE USE OF OR INABILITY
+ *  TO USE THE MATERIALS, EVEN IF AMD HAS BEEN ADVISED OF THE POSSIBILITY OF
+ *  SUCH DAMAGES.  BECAUSE SOME JURSIDICTIONS PROHIBIT THE EXCLUSION OR
+ *  LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES, THE ABOVE
+ *  LIMITATION MAY NOT APPLY TO YOU.
+ * 
+ *  AMD does not assume any responsibility for any errors that may appear in
+ *  the Materials nor any responsibility to support or update the Materials.
+ *  AMD retains the right to make changes to its test specifications at any
+ *  time, without notice.
+ * 
+ *  So that all may benefit from your experience, please report  any  problems 
+ *  or suggestions about this software back to AMD.  Please include your name, 
+ *  company,  telephone number,  AMD product requiring support and question or 
+ *  problem encountered.                                                       
+ *                                                                             
+ *  Advanced Micro Devices, Inc.         Worldwide support and contact           
+ *  Embedded Processor Division            information available at:               
+ *  Systems Engineering                       epd.support@amd.com
+ *  5204 E. Ben White Blvd.                          -or-
+ *  Austin, TX 78741                http://www.amd.com/html/support/techsup.html
+ *  ============================================================================
+ */
+
+
+/*******************************************************************************
+ *	 AUTHOR      : Buddy Fey - Original. 
+ *******************************************************************************
+ */
+
+
+/*******************************************************************************
+ *       FUNCTIONAL DESCRIPTION:
+ * This routine is called to autodetect the geometry of the DRAM.
+ *
+ * This routine is called to determine the number of column bits for the DRAM
+ * devices in this external bank. This routine assumes that the external bank
+ * has been configured for an 11-bit column and for 4 internal banks. This gives
+ * us the maximum address reach in memory. By writing a test value to the max
+ * address and locating where it aliases to, we can determine the number of valid
+ * column bits.
+ *
+ * This routine is called to determine the number of internal banks each DRAM
+ * device has. The external bank (under test) is configured for maximum reach
+ * with 11-bit columns and 4 internal banks. This routine will write to a max
+ * address (BA1 and BA0 = 1) and then read from an address with BA1=0 to see if
+ * that column is a "don't care". If BA1 does not affect write/read of data,
+ * then this device has only 2 internal banks.
+ *
+ * This routine is called to determine the ending address for this external
+ * bank of SDRAM. We write to a max address with a data value and then disable
+ * row address bits looking for "don't care" locations. Each "don't care" bit
+ * represents a dividing of the maximum density (128M) by 2. By dividing the
+ * maximum of 32 4M chunks in an external bank down by all the "don't care" bits
+ * determined during sizing, we set the proper density.
+ *
+ * WARNINGS.
+ * bp must be preserved because it is used for return linkage.
+ *
+ * EXIT
+ * nothing returned - but the memory subsystem is enabled
+ *******************************************************************************
+ */
+
+.section .text
+.equ            DRCCTL,     0x0fffef010   /* DRAM control register */
+.equ            DRCTMCTL,   0x0fffef012   /* DRAM timing control register */
+.equ            DRCCFG,     0x0fffef014   /* DRAM bank configuration register */
+.equ            DRCBENDADR, 0x0fffef018   /* DRAM bank ending address register */
+.equ            ECCCTL,     0x0fffef020   /* DRAM ECC control register */
+.equ            DBCTL,      0x0fffef040   /* DRAM buffer control register */
+
+.equ            CACHELINESZ, 0x00000010   /* size of our cache line (read buffer) */
+.equ            COL11_ADR,  0x0e001e00    /* 11 col addrs */
+.equ            COL10_ADR,  0x0e000e00    /* 10 col addrs */
+.equ            COL09_ADR,  0x0e000600    /*  9 col addrs */
+.equ            COL08_ADR,  0x0e000200    /*  8 col addrs */
+.equ            ROW14_ADR,  0x0f000000    /* 14 row addrs */
+.equ            ROW13_ADR,  0x07000000    /* 13 row addrs */
+.equ            ROW12_ADR,  0x03000000    /* 12 row addrs */
+.equ            ROW11_ADR,  0x01000000    /* 11 row addrs/also bank switch */
+.equ            ROW10_ADR,  0x00000000    /* 10 row addrs/also bank switch */
+.equ            COL11_DATA, 0x0b0b0b0b    /* 11 col addrs */
+.equ            COL10_DATA, 0x0a0a0a0a    /* 10 col data */
+.equ            COL09_DATA, 0x09090909    /*  9 col data */
+.equ            COL08_DATA, 0x08080808    /*  8 col data */
+.equ            ROW14_DATA, 0x3f3f3f3f    /* 14 row data (MASK) */
+.equ            ROW13_DATA, 0x1f1f1f1f    /* 13 row data (MASK) */
+.equ            ROW12_DATA, 0x0f0f0f0f    /* 12 row data (MASK) */
+.equ            ROW11_DATA, 0x07070707    /* 11 row data/also bank switch (MASK) */
+.equ            ROW10_DATA, 0xaaaaaaaa    /* 10 row data/also bank switch (MASK) */
+
+
+ /*
+  * initialize dram controller registers
+  */
+.globl mem_init
+mem_init: 
+        xorw    %ax,%ax
+        movl    $DBCTL, %edi             
+fs	movb     %al, (%edi)             /* disable write buffer */
+
+        movl    $ECCCTL, %edi            
+fs	movb     %al, (%edi)             /* disable ECC */
+
+        movl    $DRCTMCTL, %edi           
+        movb    $0x1E,%al                /* Set SDRAM timing for slowest */
+fs	movb     %al, (%edi)
+
+ /*
+  * setup loop to do 4 external banks starting with bank 3
+  */
+        movl    $0xff000000,%eax         /* enable last bank and setup */
+        movl    $DRCBENDADR, %edi        /* ending address register */
+fs	movl     %eax, (%edi)
+
+        movl    $DRCCFG, %edi            /* setup */
+        movw    $0xbbbb,%ax              /* dram config register for  */
+fs	movw    %ax, (%edi)
+
+ /*
+  * issue a NOP to all DRAMs
+  */
+        movl    $DRCCTL, %edi            /* setup DRAM control register with */
+        movb    $0x1,%al                 /* Disable refresh,disable write buffer */ 
+fs	movb     %al, (%edi)
+        movl    $CACHELINESZ, %esi       /* just a dummy address to write for */ 
+fs	movw     %ax, (%esi)
+ /*
+  * delay for 100 usec? 200?
+  * ******this is a cludge for now *************
+  */
+        movw    $100,%cx
+sizdelay: 
+        loop    sizdelay                 /* we need 100 usec here */
+ /***********************************************/
+
+ /*
+  * issue all banks precharge
+  */
+        movb    $0x2,%al                 /* All banks precharge */
+fs	movb     %al, (%edi)
+fs	movw     %ax, (%esi)
+
+ /*
+  * issue 2 auto refreshes to all banks 
+  */
+        movb    $0x4,%al                 /* Auto refresh cmd */
+fs	movb     %al, (%edi)
+        movw    $2,%cx
+refresh1: 
+fs	movw     %ax, (%esi)
+        loop    refresh1
+
+ /*
+  * issue LOAD MODE REGISTER command
+  */
+        movb    $0x3,%al                 /* Load mode register cmd */
+fs	movb     %al, (%edi)
+fs	movw     %ax, (%esi)
+
+ /*
+  * issue 8 more auto refreshes to all banks 
+  */ 
+        movb    $0x4,%al                 /* Auto refresh cmd */
+fs	movb     %al, (%edi)
+        movw    $8,%cx
+refresh2: 
+fs	movw     %ax, (%esi)
+        loop    refresh2
+
+ /*
+  * set control register to NORMAL mode 
+  */
+        movb    $0x0,%al                 /* Normal mode value */
+fs	movb     %al, (%edi)
+
+ /*
+  * size dram starting with external bank 3 moving to external bank 0
+  */
+        movl    $0x3,%ecx                /* start with external bank 3 */
+
+nextbank: 
+
+ /*
+  * write col 11 wrap adr
+  */
+        movl    $COL11_ADR, %esi         /* set address to max col (11) wrap addr */
+        movl    $COL11_DATA, %eax        /* pattern for max supported columns(11) */
+fs      movl    %eax, (%esi)             /* write max col pattern at max col adr */
+fs      movl    (%esi), %ebx             /* optional read */
+        cmpl    %ebx,%eax                /* to verify write */
+        jnz     bad_ram                  /* this ram is bad */
+ /*
+  * write col 10 wrap adr
+  */
+
+        movl    $COL10_ADR, %esi         /* set address to 10 col wrap address */
+        movl    $COL10_DATA, %eax        /* pattern for 10 col wrap */
+fs      movl    %eax, (%esi)             /* write 10 col pattern @ 10 col wrap adr */
+fs      movl    (%esi), %ebx             /* optional read */
+        cmpl    %ebx,%eax                /* to verify write */
+        jnz     bad_ram                  /* this ram is bad */
+ /*
+  * write col 9 wrap adr
+  */
+        movl    $COL09_ADR, %esi         /* set address to 9 col wrap address */
+        movl    $COL09_DATA, %eax        /* pattern for 9 col wrap */
+fs      movl    %eax, (%esi)             /* write 9 col pattern @ 9 col wrap adr */
+fs      movl    (%esi), %ebx             /* optional read */
+        cmpl    %ebx,%eax                /* to verify write */
+        jnz     bad_ram                  /* this ram is bad */
+ /*
+  * write col 8 wrap adr
+  */
+        movl    $COL08_ADR, %esi         /* set address to min(8) col wrap address */
+        movl    $COL08_DATA, %eax        /* pattern for min (8) col wrap */
+fs      movl    %eax, (%esi)             /* write min col pattern @ min col adr */
+fs      movl    (%esi), %ebx             /* optional read */
+        cmpl    %ebx,%eax                /* to verify write */
+        jnz     bad_ram                  /* this ram is bad */
+ /*
+  * write row 14 wrap adr
+  */
+        movl    $ROW14_ADR, %esi         /* set address to max row (14) wrap addr */
+        movl    $ROW14_DATA, %eax        /* pattern for max supported rows(14) */
+fs      movl    %eax, (%esi)             /* write max row pattern at max row adr */
+fs      movl    (%esi), %ebx             /* optional read */
+        cmpl    %ebx,%eax                /* to verify write */
+        jnz     bad_ram                  /* this ram is bad */
+ /*
+  * write row 13 wrap adr
+  */
+        movl    $ROW13_ADR, %esi         /* set address to 13 row wrap address */
+        movl    $ROW13_DATA, %eax        /* pattern for 13 row wrap */
+fs      movl    %eax, (%esi)             /* write 13 row pattern @ 13 row wrap adr */
+fs      movl    (%esi), %ebx             /* optional read */
+        cmpl    %ebx,%eax                /* to verify write */
+        jnz     bad_ram                  /* this ram is bad */
+ /*
+  * write row 12 wrap adr
+  */
+        movl    $ROW12_ADR, %esi         /* set address to 12 row wrap address */
+        movl    $ROW12_DATA, %eax        /* pattern for 12 row wrap */
+fs      movl    %eax, (%esi)             /* write 12 row pattern @ 12 row wrap adr */
+fs      movl    (%esi), %ebx             /* optional read */
+        cmpl    %ebx,%eax                /* to verify write */
+        jnz     bad_ram                  /* this ram is bad */
+ /*
+  * write row 11 wrap adr
+  */
+        movl    $ROW11_ADR, %edi         /* set address to 11 row wrap address */
+        movl    $ROW11_DATA, %eax        /* pattern for 11 row wrap */
+fs      movl    %eax, (%edi)             /* write 11 row pattern @ 11 row wrap adr */
+fs      movl    (%edi), %ebx             /* optional read */
+        cmpl    %ebx,%eax                /* to verify write */
+        jnz     bad_ram                  /* this ram is bad */
+ /*
+  * write row 10 wrap adr --- this write is really to determine number of banks
+  */
+        movl    $ROW10_ADR, %edi         /* set address to 10 row wrap address */
+        movl    $ROW10_DATA, %eax        /* pattern for 10 row wrap (AA) */
+fs      movl    %eax, (%edi)             /* write 10 row pattern @ 10 row wrap adr */
+fs      movl    (%edi), %ebx             /* optional read */
+        cmpl    %ebx,%eax                /* to verify write */
+        jnz     bad_ram                  /* this ram is bad */
+ /*
+  * read data @ row 12 wrap adr to determine  * banks, 
+  * and read data @ row 14 wrap adr to determine  * rows.
+  * if data @ row 12 wrap adr is not AA, 11 or 12 we have bad RAM.
+  * if data @ row 12 wrap == AA, we only have 2 banks, NOT 4 
+  * if data @ row 12 wrap == 11 or 12, we have 4 banks,
+  */
+        xorw    %di,%di                  /* value for 2 banks in DI */
+fs      movl    (%esi), %ebx             /* read from 12 row wrap to check banks 
+                                          * (esi is setup from the write to row 12 wrap) */
+        cmpl    %ebx,%eax                /* check for AA pattern  (eax holds the aa pattern) */
+        jz      only2                    /* if pattern == AA, we only have 2 banks */
+
+	/* 4 banks */
+	
+        movw    $8,%di                   /* value for 4 banks in DI (BNK_CNT bit) */
+        cmpl    $ROW11_DATA, %ebx        /* only other legitimate values are 11 */
+        jz      only2
+        cmpl    $ROW12_DATA, %ebx        /* and 12 */
+        jnz     bad_ram                  /* its bad if not 11 or 12! */
+	
+	/* fall through */
+only2: 
+ /*
+  * validate row mask
+  */
+        movl    $ROW14_ADR, %esi         /* set address back to max row wrap addr */
+fs      movl    (%esi), %eax             /* read actual number of rows @ row14 adr */
+
+        cmpl    $ROW11_DATA, %eax        /* row must be greater than 11 pattern */
+        jb      bad_ram
+
+        cmpl    $ROW14_DATA, %eax        /* and row must be less than 14 pattern */
+        ja      bad_ram
+
+        cmpb    %ah,%al                  /* verify all 4 bytes of dword same */
+        jnz     bad_ram
+        movl    %eax,%ebx
+        shrl    $16,%ebx
+        cmpw    %bx,%ax
+        jnz     bad_ram
+ /*
+  * read col 11 wrap adr for real column data value
+  */
+        movl    $COL11_ADR, %esi         /* set address to max col (11) wrap addr */
+fs      movl    (%esi), %eax             /* read real col number at max col adr */
+ /*
+  * validate column data
+  */
+        cmpl    $COL08_DATA, %eax        /* col must be greater than 8 pattern */
+        jb      bad_ram
+
+        cmpl    $COL11_DATA, %eax        /* and row must be less than 11 pattern */
+        ja      bad_ram
+
+        subl    $COL08_DATA, %eax        /* normalize column data to zero */
+        jc      bad_ram
+        cmpb    %ah,%al                  /* verify all 4 bytes of dword equal */
+        jnz     bad_ram
+        movl    %eax,%edx
+        shrl    $16,%edx
+        cmpw    %dx,%ax
+        jnz     bad_ram
+ /*
+  * merge bank and col data together
+  */
+        addw    %di,%dx                  /* merge of bank and col info in dl */
+ /*
+  * fix ending addr mask based upon col info
+  */
+        movb    $3,%al
+        subb    %dh,%al                  /* dh contains the overflow from the bank/col merge  */
+        movb    %bl,%dh                  /* bl contains the row mask (aa, 07, 0f, 1f or 3f) */
+        xchgw   %cx,%ax                  /* cx = ax = 3 or 2 depending on 2 or 4 bank device */
+        shrb    %cl,%dh	                 /*  */
+        incb    %dh                      /* ending addr is 1 greater than real end */
+        xchgw   %cx,%ax                  /* cx is bank number again */
+ /*
+  * issue all banks precharge
+  */
+bad_reint: 
+        movl    $DRCCTL, %esi            /* setup DRAM control register with */
+        movb    $0x2,%al                 /* All banks precharge */
+fs	movb     %al, (%esi)
+        movl    $CACHELINESZ, %esi       /* address to init read buffer */
+fs	movw     %ax, (%esi)
+
+ /*
+  * update ENDING ADDRESS REGISTER
+  */
+        movl    $DRCBENDADR, %edi        /* DRAM ending address register */
+        movl    %ecx,%ebx
+	addl	%ebx, %edi
+fs	movb    %dh, (%edi)
+ /*
+  * update CONFIG REGISTER
+  */
+        xorb    %dh,%dh
+        movw    $0x00f,%bx
+        movw    %cx,%ax
+        shlw    $2,%ax
+        xchgw   %cx,%ax
+        shlw    %cl,%dx
+        shlw    %cl,%bx
+        notw    %bx
+        xchgw   %cx,%ax
+        movl    $DRCCFG, %edi
+fs	mov     (%edi), %ax
+        andw    %bx,%ax
+        orw     %dx,%ax
+fs      movw    %ax, (%edi)
+        jcxz    cleanup
+
+        decw    %cx
+        movl    %ecx,%ebx
+        movl    $DRCBENDADR, %edi        /* DRAM ending address register */
+        movb    $0xff,%al
+	addl	%ebx, %edi
+fs	movb    %al, (%edi)
+ /*
+  * set control register to NORMAL mode 
+  */
+        movl    $DRCCTL, %esi            /* setup DRAM control register with */
+        movb    $0x0,%al                 /* Normal mode value */
+fs	movb    %al, (%esi)
+        movl    $CACHELINESZ, %esi       /* address to init read buffer */
+fs	movw    %ax, (%esi)
+        jmp     nextbank
+
+cleanup: 
+        movl    $DRCBENDADR, %edi        /* DRAM ending address register  */
+        movw    $4,%cx
+        xorw    %ax,%ax
+cleanuplp: 
+fs	movb   (%edi), %al
+        orb     %al,%al
+        jz      emptybank
+
+        addb    %ah,%al
+        jns     nottoomuch
+
+        movb    $0x7f,%al
+nottoomuch: 
+        movb    %al,%ah
+        orb     $0x80,%al
+fs	movb    %al, (%edi)
+emptybank: 
+        incl    %edi
+        loop    cleanuplp
+
+#if defined(CFG_SDRAM_CAS_LATENCY_2T) || defined(CFG_SDRAM_CAS_LATENCY_3T)
+	/* set the CAS latency now since it is hard to do
+	 * when we run from the RAM */
+	movl    $DRCTMCTL, %edi          /* DRAM timing register */
+	movb    (%edi), %al	
+#ifdef CFG_SDRAM_CAS_LATENCY_2T
+	andb    $0xef, %al
+#endif
+#ifdef CFG_SDRAM_CAS_LATENCY_3T
+	orb     $0x10, %al
+#endif	 
+	movb    %al, (%edi)
+#endif
+        movl    $DRCCTL, %edi            /* DRAM Control register */
+        movb    $0x3,%al                 /* Load mode register cmd */
+fs	movb     %al, (%edi)
+fs	movw     %ax, (%esi)
+
+
+        movl    $DRCCTL, %edi            /* DRAM Control register */
+        movb    $0x18,%al                /*  Enable refresh and NORMAL mode */
+fs	movb    %al, (%edi)
+
+        jmp     dram_done
+
+bad_ram: 
+        xorl    %edx,%edx
+        xorl    %edi,%edi
+        jmp     bad_reint
+
+dram_done: 
+	
+	/* readback DRCBENDADR and return the number
+	 * of available ram bytes in %eax */ 
+
+        movl    $DRCBENDADR, %edi        /* DRAM ending address register  */
+	
+	movl	(%edi), %eax
+	movl	%eax, %ecx
+	andl	$0x80000000, %ecx
+	jz	bank2
+	andl	$0x7f000000, %eax
+	shrl	$2, %eax 
+	movl	%eax, %ebx
+
+bank2: 	movl	(%edi), %eax
+	movl	%eax, %ecx
+	andl	$0x00800000, %ecx
+	jz	bank1
+	andl	$0x007f0000, %eax
+	shll	$6, %eax 
+	movl	%eax, %ebx
+
+bank1: 	movl	(%edi), %eax
+	movl	%eax, %ecx
+	andl	$0x00008000, %ecx
+	jz	bank0
+	andl	$0x00007f00, %eax
+	shll	$14, %eax 
+	movl	%eax, %ebx
+
+bank0: 	movl	(%edi), %eax
+	movl	%eax, %ecx
+	andl	$0x00000080, %ecx
+	jz	done
+	andl	$0x0000007f, %eax
+	shll	$22, %eax 
+	movl	%eax, %ebx
+
+done:	movl	%ebx, %eax
+
+	jmp	*%ebp