path: root/src/northbridge/amd/lx/northbridgeinit.c

/*
 * This file is part of the coreboot project.
 *
 * Copyright (C) 2007 Advanced Micro Devices, Inc.
 *
 * 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.
 */

#include <console/console.h>
#include <arch/io.h>
#include <stdint.h>
#include <device/device.h>
#include <device/pci.h>
#include <device/pci_ids.h>
#include <stdlib.h>
#include <string.h>
#include "northbridge.h"
#include <cpu/amd/lxdef.h>
#include <cpu/x86/msr.h>
#include <cpu/x86/cache.h>
#include <cbmem.h>

struct gliutable {
	unsigned long desc_name;
	unsigned short desc_type;
	unsigned long hi, lo;
};

struct gliutable gliu0table[] = {
	{.desc_name = MSR_GLIU0_BASE1,.desc_type = BM,.hi = MSR_MC + 0x0,.lo = 0x0FFF80},	/*  0-7FFFF to MC */
	{.desc_name = MSR_GLIU0_BASE2,.desc_type = BM,.hi = MSR_MC + 0x0,.lo = (0x80 << 20) + 0x0FFFE0},	/*  80000-9ffff to Mc */
	{.desc_name = MSR_GLIU0_SHADOW,.desc_type = SC_SHADOW,.hi = MSR_MC + 0x0,.lo = 0x03},	/*  C0000-Fffff split to MC and PCI (sub decode) A0000-Bffff handled by SoftVideo */
	{.desc_name = MSR_GLIU0_SYSMEM,.desc_type = R_SYSMEM,.hi = MSR_MC,.lo = 0x0},	/*  Catch and fix dynamicly. */
	{.desc_name = MSR_GLIU0_SMM,.desc_type = BMO_SMM,.hi = MSR_MC,.lo = 0x0},	/*  Catch and fix dynamicly. */
	{.desc_name = GLIU0_GLD_MSR_COH,.desc_type = OTHER,.hi = 0x0,.lo =
	 GL0_CPU},
	{.desc_name = GL_END,.desc_type = GL_END,.hi = 0x0,.lo = 0x0},
};

struct gliutable gliu1table[] = {
	{.desc_name = MSR_GLIU1_BASE1,.desc_type = BM,.hi = MSR_GL0 + 0x0,.lo = 0x0FFF80},	/*  0-7FFFF to MC */
	{.desc_name = MSR_GLIU1_BASE2,.desc_type = BM,.hi = MSR_GL0 + 0x0,.lo = (0x80 << 20) + 0x0FFFE0},	/*  80000-9ffff to Mc */
	{.desc_name = MSR_GLIU1_SHADOW,.desc_type = SC_SHADOW,.hi = MSR_GL0 + 0x0,.lo = 0x03},	/*  C0000-Fffff split to MC and PCI (sub decode) */
	{.desc_name = MSR_GLIU1_SYSMEM,.desc_type = R_SYSMEM,.hi = MSR_GL0,.lo = 0x0},	/*      Catch and fix dynamicly. */
	{.desc_name = MSR_GLIU1_SMM,.desc_type = BM_SMM,.hi = MSR_GL0,.lo = 0x0},	/*      Catch and fix dynamicly. */
	{.desc_name = GLIU1_GLD_MSR_COH,.desc_type = OTHER,.hi = 0x0,.lo =
	 GL1_GLIU0},
	{.desc_name = MSR_GLIU1_FPU_TRAP,.desc_type = SCIO,.hi = (GL1_GLCP << 29) + 0x0,.lo = 0x033000F0},	/*  FooGlue FPU 0xF0 */
	{.desc_name = GL_END,.desc_type = GL_END,.hi = 0x0,.lo = 0x0},
};

struct gliutable *gliutables[] = { gliu0table, gliu1table, 0 };

struct msrinit {
	unsigned long msrnum;
	msr_t msr;
};

struct msrinit ClockGatingDefault[] = {
	{GLIU0_GLD_MSR_PM, {.hi = 0x00,.lo = 0x0005}},
	{MC_GLD_MSR_PM, {.hi = 0x00,.lo = 0x0001}},
	{VG_GLD_MSR_PM, {.hi = 0x00,.lo = 0x0015}},
	{GP_GLD_MSR_PM, {.hi = 0x00,.lo = 0x0001}},
	{DF_GLD_MSR_PM, {.hi = 0x00,.lo = 0x0555}},
	{GLIU1_GLD_MSR_PM, {.hi = 0x00,.lo = 0x0005}},
	{GLCP_GLD_MSR_PM, {.hi = 0x00,.lo = 0x0014}},
	{GLPCI_GLD_MSR_PM, {.hi = 0x00,.lo = 0x0015}},
	{VIP_GLD_MSR_PM, {.hi = 0x00,.lo = 0x0005}},
	{AES_GLD_MSR_PM, {.hi = 0x00,.lo = 0x0015}},
	{CPU_BC_PMODE_MSR, {.hi = 0x00,.lo = 0x70303}},
	{0xffffffff, {0xffffffff, 0xffffffff}},
};

/* */
/*  SET GeodeLink PRIORITY*/
/* */
struct msrinit GeodeLinkPriorityTable[] = {
	{CPU_GLD_MSR_CONFIG, {.hi = 0x00,.lo = 0x0220}},
	{DF_GLD_MSR_MASTER_CONF, {.hi = 0x00,.lo = 0x0000}},
	{VG_GLD_MSR_CONFIG, {.hi = 0x00,.lo = 0x0720}},
	{GP_GLD_MSR_CONFIG, {.hi = 0x00,.lo = 0x0010}},
	{GLPCI_GLD_MSR_CONFIG, {.hi = 0x00,.lo = 0x0017}},
	{GLCP_GLD_MSR_CONF, {.hi = 0x00,.lo = 0x0001}},
	{VIP_GLD_MSR_CONFIG, {.hi = 0x00,.lo = 0x0622}},
	{AES_GLD_MSR_CONFIG, {.hi = 0x00,.lo = 0x0013}},
	{0x0FFFFFFFF, {0x0FFFFFFFF, 0x0FFFFFFFF}},	/*  END */
};


static void writeglmsr(struct gliutable *gl)
{
	msr_t msr;

	msr.lo = gl->lo;
	msr.hi = gl->hi;
	wrmsr(gl->desc_name, msr);	// MSR - see table above
	printk(BIOS_DEBUG, "%s: MSR 0x%08lx, val 0x%08x:0x%08x\n", __func__, gl->desc_name, msr.hi, msr.lo);	// GX3
}

static void ShadowInit(struct gliutable *gl)
{
	msr_t msr;

	msr = rdmsr(gl->desc_name);

	if (msr.lo == 0) {
		writeglmsr(gl);
	}
}

static void SysmemInit(struct gliutable *gl)
{
	msr_t msr;
	int sizembytes, sizebytes;

	/*
	 * Figure out how much RAM is in the machine and alocate all to the
	 * system. We will adjust for SMM now and Frame Buffer later.
	 */
	sizembytes = sizeram();
	printk(BIOS_DEBUG, "%s: enable for %dMBytes\n", __func__, sizembytes);
	sizebytes = sizembytes << 20;

	sizebytes -= ((SMM_SIZE * 1024) + 1);
	printk(BIOS_DEBUG, "usable RAM: %d bytes\n", sizebytes);

	/* 20 bit address The bottom 12 bits go into bits 20-31 in msr.lo
	   The top 8 bits go into 0-7 of msr.hi. */
	sizebytes--;
	msr.hi = (gl->hi & 0xFFFFFF00) | (sizebytes >> 24);
	sizebytes <<= 8;	/* move bits 23:12 in bits 31:20. */
	sizebytes &= 0xfff00000;
	sizebytes |= 0x100;	/* start at 1MB */
	msr.lo = sizebytes;

	wrmsr(gl->desc_name, msr);	// MSR - see table above
	printk(BIOS_DEBUG, "%s: MSR 0x%08lx, val 0x%08x:0x%08x\n", __func__,
		     gl->desc_name, msr.hi, msr.lo);
}

static void SMMGL0Init(struct gliutable *gl)
{
	msr_t msr;
	int sizebytes = sizeram() << 20;
	long offset;

	sizebytes -= (SMM_SIZE * 1024);

	printk(BIOS_DEBUG, "%s: %d bytes\n", __func__, sizebytes);

	/* calculate the Two's complement offset */
	offset = sizebytes - SMM_OFFSET;
	offset = (offset >> 12) & 0x000fffff;
	printk(BIOS_DEBUG, "%s: offset is 0x%08x\n", __func__, SMM_OFFSET);

	msr.hi = offset << 8 | gl->hi;
	msr.hi |= SMM_OFFSET >> 24;

	msr.lo = (SMM_OFFSET & 0x00ffffff) << 8;
	msr.lo |= ((~(SMM_SIZE * 1024) + 1) >> 12) & 0xfffff;

	wrmsr(gl->desc_name, msr);	// MSR - See table above
	printk(BIOS_DEBUG, "%s: MSR 0x%08lx, val 0x%08x:0x%08x\n", __func__,
		     gl->desc_name, msr.hi, msr.lo);
}

static void SMMGL1Init(struct gliutable *gl)
{
	msr_t msr;
	printk(BIOS_DEBUG, "%s:\n", __func__);

	msr.hi = gl->hi;
	/* I don't think this is needed */
	msr.hi &= 0xffffff00;
	msr.hi |= (SMM_OFFSET >> 24);
	msr.lo = (SMM_OFFSET & 0x00fff000) << 8;
	msr.lo |= ((~(SMM_SIZE * 1024) + 1) >> 12) & 0xfffff;

	wrmsr(gl->desc_name, msr);	// MSR - See table above
	printk(BIOS_DEBUG, "%s: MSR 0x%08lx, val 0x%08x:0x%08x\n", __func__,
		     gl->desc_name, msr.hi, msr.lo);
}

static void GLIUInit(struct gliutable *gl)
{

	while (gl->desc_type != GL_END) {
		switch (gl->desc_type) {
		default:
			/* For Unknown types: Write then read MSR */
			writeglmsr(gl);
		case SC_SHADOW:	/*  Check for a Shadow entry */
			ShadowInit(gl);
			break;

		case R_SYSMEM:	/*  check for a SYSMEM entry */
			SysmemInit(gl);
			break;

		case BMO_SMM:	/*  check for a SMM entry */
			SMMGL0Init(gl);
			break;

		case BM_SMM:	/*  check for a SMM entry */
			SMMGL1Init(gl);
			break;
		}
		gl++;
	}

}

	/* ************************************************************************** */
	/* * */
	/* *    GLPCIInit */
	/* * */
	/* *    Set up GLPCI settings for reads/write into memory */
	/* *    R0:  0-640KB, */
	/* *    R1:  1MB - Top of System Memory */
	/* *    R2: SMM Memory */
	/* *    R3: Framebuffer? - not set up yet */
	/* *    R4: ?? */
	/* * */
	/* *    Entry: */
	/* *    Exit: */
	/* *    Modified: */
	/* * */
	/* ************************************************************************** */
static void GLPCIInit(void)
{
	struct gliutable *gl = 0;
	int i;
	msr_t msr;
	int msrnum, enable_preempt, enable_cpu_override;
	int nic_grants_control, enable_bus_parking;

	/* */
	/*  R0 - GLPCI settings for Conventional Memory space. */
	/* */
	msr.hi = (0x09F000 >> 12) << GLPCI_RC_UPPER_TOP_SHIFT;	/* 640 */
	msr.lo = 0;		/* 0 */
	msr.lo |=
	    GLPCI_RC_LOWER_EN_SET + GLPCI_RC_LOWER_PF_SET +
	    GLPCI_RC_LOWER_WC_SET;
	msrnum = GLPCI_RC0;
	wrmsr(msrnum, msr);

	/* */
	/*  R1 - GLPCI settings for SysMem space. */
	/* */
	/*  Get systop from GLIU0 SYSTOP Descriptor */
	for (i = 0; gliu0table[i].desc_name != GL_END; i++) {
		if (gliu0table[i].desc_type == R_SYSMEM) {
			gl = &gliu0table[i];
			break;
		}
	}
	if (gl) {
		unsigned long pah, pal;
		msrnum = gl->desc_name;
		msr = rdmsr(msrnum);
		/* example R_SYSMEM value: 20:00:00:0f:fb:f0:01:00
		 * translates to a base of 0x00100000 and top of 0xffbf0000
		 * base of 1M and top of around 256M
		 */
		/* we have to create a page-aligned (4KB page) address for base and top */
		/* So we need a high page aligned addresss (pah) and low page aligned address (pal)
		 * pah is from msr.hi << 12 | msr.low >> 20. pal is msr.lo << 12
		 */
		pah = ((msr.hi & 0xFF) << 12) | ((msr.lo >> 20) & 0xFFF);
		/* we have the page address. Now make it a page-aligned address */
		pah <<= 12;

		pal = msr.lo << 12;
		msr.hi = pah;
		msr.lo = pal;
		msr.lo |=
		    GLPCI_RC_LOWER_EN_SET | GLPCI_RC_LOWER_PF_SET |
		    GLPCI_RC_LOWER_WC_SET;
		printk(BIOS_DEBUG, "GLPCI R1: system msr.lo 0x%08x msr.hi 0x%08x\n",
			     msr.lo, msr.hi);
		msrnum = GLPCI_RC1;
		wrmsr(msrnum, msr);
	}

	/* */
	/*      R2 - GLPCI settings for SMM space */
	/* */
	msr.hi =
	    ((SMM_OFFSET +
	      (SMM_SIZE * 1024 - 1)) >> 12) << GLPCI_RC_UPPER_TOP_SHIFT;
	msr.lo = (SMM_OFFSET >> 12) << GLPCI_RC_LOWER_BASE_SHIFT;
	msr.lo |= GLPCI_RC_LOWER_EN_SET | GLPCI_RC_LOWER_PF_SET;
	printk(BIOS_DEBUG, "GLPCI R2: system msr.lo 0x%08x msr.hi 0x%08x\n", msr.lo,
		     msr.hi);
	msrnum = GLPCI_RC2;
	wrmsr(msrnum, msr);

	/* this is done elsewhere already, but it does no harm to do it more than once */
	/*  write serialize memory hole to PCI. Need to to unWS when something is shadowed regardless of cachablility. */
	msr.lo = 0x021212121;	/* cache disabled and write serialized */
	msr.hi = 0x021212121;	/* cache disabled and write serialized */

	msrnum = CPU_RCONF_A0_BF;
	wrmsr(msrnum, msr);

	msrnum = CPU_RCONF_C0_DF;
	wrmsr(msrnum, msr);

	msrnum = CPU_RCONF_E0_FF;
	wrmsr(msrnum, msr);

	/*  Set Non-Cacheable Read Only for NorthBound Transactions to Memory. The Enable bit is handled in the Shadow setup. */
	msrnum = GLPCI_A0_BF;
	msr.hi = 0x35353535;
	msr.lo = 0x35353535;
	wrmsr(msrnum, msr);

	msrnum = GLPCI_C0_DF;
	msr.hi = 0x35353535;
	msr.lo = 0x35353535;
	wrmsr(msrnum, msr);

	msrnum = GLPCI_E0_FF;
	msr.hi = 0x35353535;
	msr.lo = 0x35353535;
	wrmsr(msrnum, msr);

	/*  Set WSREQ */
	msrnum = CPU_DM_CONFIG0;
	msr = rdmsr(msrnum);
	msr.hi &= ~(7 << DM_CONFIG0_UPPER_WSREQ_SHIFT);
	msr.hi |= 2 << DM_CONFIG0_UPPER_WSREQ_SHIFT;	/* reduce to 1 for safe mode */
	wrmsr(msrnum, msr);

	/* we are ignoring the 5530 case for now, and perhaps forever. */

	/* */
	/* 553x NB Init */
	/* */

	/* Arbiter setup */
	enable_preempt =
	    GLPCI_ARB_LOWER_PRE0_SET | GLPCI_ARB_LOWER_PRE1_SET |
	    GLPCI_ARB_LOWER_PRE2_SET | GLPCI_ARB_LOWER_CPRE_SET;
	enable_cpu_override = GLPCI_ARB_LOWER_COV_SET;
	enable_bus_parking = GLPCI_ARB_LOWER_PARK_SET;
	nic_grants_control =
	    (0x4 << GLPCI_ARB_UPPER_R2_SHIFT) | (0x3 <<
						 GLPCI_ARB_UPPER_H2_SHIFT);

	msrnum = GLPCI_ARB;
	msr = rdmsr(msrnum);

	msr.hi |= nic_grants_control;
	msr.lo |= enable_cpu_override | enable_preempt | enable_bus_parking;
	wrmsr(msrnum, msr);

	msrnum = GLPCI_CTRL;
	msr = rdmsr(msrnum);

	msr.lo |= GLPCI_CTRL_LOWER_ME_SET | GLPCI_CTRL_LOWER_OWC_SET | GLPCI_CTRL_LOWER_PCD_SET;	/*   (Out will be disabled in CPUBUG649 for < 2.0 parts .) */
	msr.lo |= GLPCI_CTRL_LOWER_LDE_SET;

	msr.lo &= ~(0x03 << GLPCI_CTRL_LOWER_IRFC_SHIFT);
	msr.lo |= 0x02 << GLPCI_CTRL_LOWER_IRFC_SHIFT;

	msr.lo &= ~(0x07 << GLPCI_CTRL_LOWER_IRFT_SHIFT);
	msr.lo |= 0x06 << GLPCI_CTRL_LOWER_IRFT_SHIFT;

	msr.hi &= ~(0x0f << GLPCI_CTRL_UPPER_FTH_SHIFT);
	msr.hi |= 0x0F << GLPCI_CTRL_UPPER_FTH_SHIFT;

	msr.hi &= ~(0x0f << GLPCI_CTRL_UPPER_RTH_SHIFT);
	msr.hi |= 0x0F << GLPCI_CTRL_UPPER_RTH_SHIFT;

	msr.hi &= ~(0x0f << GLPCI_CTRL_UPPER_SBRTH_SHIFT);
	msr.hi |= 0x0F << GLPCI_CTRL_UPPER_SBRTH_SHIFT;

	msr.hi &= ~(0x03 << GLPCI_CTRL_UPPER_WTO_SHIFT);
	msr.hi |= 0x06 << GLPCI_CTRL_UPPER_WTO_SHIFT;

	msr.hi &= ~(0x03 << GLPCI_CTRL_UPPER_ILTO_SHIFT);
	msr.hi |= 0x00 << GLPCI_CTRL_UPPER_ILTO_SHIFT;
	wrmsr(msrnum, msr);

	/* Set GLPCI Latency Timer */
	msrnum = GLPCI_CTRL;
	msr = rdmsr(msrnum);
	msr.hi |= 0x1F << GLPCI_CTRL_UPPER_LAT_SHIFT;	/* Change once 1.x is gone */
	wrmsr(msrnum, msr);

	/*  GLPCI_SPARE */
	msrnum = GLPCI_SPARE;
	msr = rdmsr(msrnum);
	msr.lo &= ~0x7;
	msr.lo |=
	    GLPCI_SPARE_LOWER_AILTO_SET | GLPCI_SPARE_LOWER_PPD_SET |
	    GLPCI_SPARE_LOWER_PPC_SET | GLPCI_SPARE_LOWER_MPC_SET |
	    GLPCI_SPARE_LOWER_NSE_SET | GLPCI_SPARE_LOWER_SUPO_SET;
	wrmsr(msrnum, msr);
}

	/* ************************************************************************** */
	/* * */
	/* *    ClockGatingInit */
	/* * */
	/* *    Enable Clock Gating. */
	/* * */
	/* *    Entry: */
	/* *    Exit: */
	/* *    Modified: */
	/* * */
	/* ************************************************************************** */
static void ClockGatingInit(void)
{
	msr_t msr;
	struct msrinit *gating = ClockGatingDefault;
	int i;

	for (i = 0; gating->msrnum != 0xffffffff; i++) {
		msr = rdmsr(gating->msrnum);
		msr.hi |= gating->msr.hi;
		msr.lo |= gating->msr.lo;
		/* printk(BIOS_DEBUG, "%s: MSR 0x%08x will be set to  0x%08x:0x%08x\n", __func__,
		   gating->msrnum, msr.hi, msr.lo); */// GX3
		wrmsr(gating->msrnum, msr);	// MSR - See the table above
		gating += 1;
	}

}

static void GeodeLinkPriority(void)
{
	msr_t msr;
	struct msrinit *prio = GeodeLinkPriorityTable;
	int i;

	for (i = 0; prio->msrnum != 0xffffffff; i++) {
		msr = rdmsr(prio->msrnum);
		msr.hi |= prio->msr.hi;
		msr.lo &= ~0xfff;
		msr.lo |= prio->msr.lo;
		/* printk(BIOS_DEBUG, "%s: MSR 0x%08x will be set to 0x%08x:0x%08x\n", __func__,
		   prio->msrnum, msr.hi, msr.lo);  */// GX3
		wrmsr(prio->msrnum, msr);	// MSR - See the table above
		prio += 1;
	}
}

/*
 *	Get the GLIU0 shadow register settings
 *	If the setShadow function is used then all shadow descriptors
 *	  will stay sync'ed.
 */
static uint64_t getShadow(void)
{
	msr_t msr;

	msr = rdmsr(MSR_GLIU0_SHADOW);
	return (((uint64_t) msr.hi) << 32) | msr.lo;
}

/*
 *	Set the cache RConf registers for the memory hole.
 *	Keeps all cache shadow descriptors sync'ed.
 *	This is part of the PCI lockup solution
 *	Entry: EDX:EAX is the shadow settings
 */
static void setShadowRCONF(uint32_t shadowHi, uint32_t shadowLo)
{

	// ok this is whacky bit translation time.
	int bit;
	uint8_t shadowByte;
	msr_t msr = { 0, 0 };
	shadowByte = (uint8_t) (shadowLo >> 16);

	// load up D000 settings in edx.
	for (bit = 8; (bit > 4); bit--) {
		msr.hi <<= 8;
		msr.hi |= 1;	// cache disable PCI/Shadow memory
		if (shadowByte && (1 << bit))
			msr.hi |= 0x20;	// write serialize PCI memory
	}

	// load up C000 settings in eax.
	for (; bit; bit--) {
		msr.lo <<= 8;
		msr.lo |= 1;	// cache disable PCI/Shadow memory
		if (shadowByte && (1 << bit))
			msr.lo |= 0x20;	// write serialize PCI memory
	}

	wrmsr(CPU_RCONF_C0_DF, msr);

	shadowByte = (uint8_t) (shadowLo >> 24);

	// load up F000 settings in edx.
	for (bit = 8; (bit > 4); bit--) {
		msr.hi <<= 8;
		msr.hi |= 1;	// cache disable PCI/Shadow memory
		if (shadowByte && (1 << bit))
			msr.hi |= 0x20;	// write serialize PCI memory
	}

	// load up E000 settings in eax.
	for (; bit; bit--) {
		msr.lo <<= 8;
		msr.lo |= 1;	// cache disable PCI/Shadow memory
		if (shadowByte && (1 << bit))
			msr.lo |= 0x20;	// write serialize PCI memory
	}

	wrmsr(CPU_RCONF_E0_FF, msr);
}

/*
 *	Set the GLPCI registers for the memory hole.
 *	Keeps all cache shadow descriptors sync'ed.
 *	Entry: EDX:EAX is the shadow settings
 */
static void setShadowGLPCI(uint32_t shadowHi, uint32_t shadowLo)
{
	msr_t msr;

// Set the Enable Register.
	msr = rdmsr(GLPCI_REN);
	msr.lo &= 0xFFFF00FF;
	msr.lo |= ((shadowLo & 0xFFFF0000) >> 8);
	wrmsr(GLPCI_REN, msr);
}

/*
 *	Set the GLIU SC register settings. Scans descriptor tables for SC_SHADOW.
 *	Keeps all shadow descriptors sync'ed.
 *	Entry: EDX:EAX is the shadow settings
 */
static void setShadow(uint64_t shadowSettings)
{
	int i;
	msr_t msr;
	struct gliutable *pTable;
	uint32_t shadowLo, shadowHi;

	shadowLo = (uint32_t) shadowSettings;
	shadowHi = (uint32_t) (shadowSettings >> 32);

	setShadowRCONF(shadowHi, shadowLo);
	setShadowGLPCI(shadowHi, shadowLo);

	for (i = 0; gliutables[i]; i++) {
		for (pTable = gliutables[i]; pTable->desc_type != GL_END;
		     pTable++) {
			if (pTable->desc_type == SC_SHADOW) {

				msr = rdmsr(pTable->desc_name);
				msr.lo = (uint32_t) shadowSettings;
				msr.hi &= 0xFFFF0000;	// maintain PDID in upper EDX
				msr.hi |=
				    ((uint32_t) (shadowSettings >> 32)) &
				    0x0000FFFF;
				wrmsr(pTable->desc_name, msr);	// MSR - See the table above
			}
		}
	}
}

static void rom_shadow_settings(void)
{

	uint64_t shadowSettings = getShadow();
	shadowSettings &= (uint64_t) 0xFFFF00000000FFFFULL;	// Disable read & writes
	shadowSettings |= (uint64_t) 0x00000000F0000000ULL;	// Enable reads for F0000-FFFFF
	shadowSettings |= (uint64_t) 0x0000FFFFFFFF0000ULL;	// Enable rw for C0000-CFFFF
	setShadow(shadowSettings);
}

/***************************************************************************
 *
 * L1Init
 *	  Set up RCONF_DEFAULT and any other RCONF registers needed
 *
 *  DEVRC_RCONF_DEFAULT:
 *  ROMRC(63:56) = 04h	 ; write protect ROMBASE
 *  ROMBASE(36:55) = 0FFFC0h ; Top of PCI/bottom of ROM chipselect area
 *  DEVRC(35:28) =  39h	 ; cache disabled in PCI memory + WS bit on + Write Combine + write burst.
 *  SYSTOP(27:8) = top of system memory
 *  SYSRC(7:0) = 00h 		 ; writeback, can set to 08h to make writethrough
 *
 ***************************************************************************/
#define SYSMEM_RCONF_WRITETHROUGH 8
#define DEVRC_RCONF_DEFAULT 0x21ul
#define ROMBASE_RCONF_DEFAULT 0xFFFC0000
#define ROMRC_RCONF_DEFAULT 0x25

static void enable_L1_cache(void)
{
	struct gliutable *gl = 0;
	int i;
	msr_t msr;
	uint8_t SysMemCacheProp;

	/* Locate SYSMEM entry in GLIU0table */
	for (i = 0; gliu0table[i].desc_name != GL_END; i++) {
		if (gliu0table[i].desc_type == R_SYSMEM) {
			gl = &gliu0table[i];
			break;
		}
	}
	if (gl == 0) {
		post_code(0xCE);	/* POST_RCONFInitError */
		while (1) ;
	}
// sysdescfound:
	msr = rdmsr(gl->desc_name);

	/* 20 bit address -  The bottom 12 bits go into bits 20-31 in eax, the
	 * top 8 bits go into 0-7 of edx.
	 */
	msr.lo = (msr.lo & 0xFFFFFF00) | (msr.hi & 0xFF);
	msr.lo = ((msr.lo << 12) | (msr.lo >> 20)) & 0x000FFFFF;
	msr.lo <<= RCONF_DEFAULT_LOWER_SYSTOP_SHIFT;	// 8

	// Set Default SYSMEM region properties
	msr.lo &= ~SYSMEM_RCONF_WRITETHROUGH;	// NOT writethrough == writeback 8 (or ~8)

	// Set PCI space cache properties
	msr.hi = (DEVRC_RCONF_DEFAULT >> 4);	// setting is split betwwen hi and lo...
	msr.lo |= (DEVRC_RCONF_DEFAULT << 28);

	// Set the ROMBASE. This is usually FFFC0000h
	msr.hi |=
	    (ROMBASE_RCONF_DEFAULT >> 12) << RCONF_DEFAULT_UPPER_ROMBASE_SHIFT;

	// Set ROMBASE cache properties.
	msr.hi |= ((ROMRC_RCONF_DEFAULT >> 8) | (ROMRC_RCONF_DEFAULT << 24));

	// now program RCONF_DEFAULT
	wrmsr(CPU_RCONF_DEFAULT, msr);
	printk(BIOS_DEBUG, "CPU_RCONF_DEFAULT (1808): 0x%08X:0x%08X\n", msr.hi,
		     msr.lo);

	// RCONF_BYPASS: Cache tablewalk properties and SMM/DMM header access properties.
	// Set to match system memory cache properties.
	msr = rdmsr(CPU_RCONF_DEFAULT);
	SysMemCacheProp = (uint8_t) (msr.lo & 0xFF);
	msr = rdmsr(CPU_RCONF_BYPASS);
	msr.lo =
	    (msr.lo & 0xFFFF0000) | (SysMemCacheProp << 8) | SysMemCacheProp;
	wrmsr(CPU_RCONF_BYPASS, msr);

	printk(BIOS_DEBUG, "CPU_RCONF_BYPASS (180A): 0x%08x : 0x%08x\n", msr.hi,
		     msr.lo);
}

static void enable_L2_cache(void)
{
	msr_t msr;

	/* Instruction Memory Configuration register
	 * set EBE bit, required when L2 cache is enabled
	 */
	msr = rdmsr(CPU_IM_CONFIG);
	msr.lo |= 0x400;
	wrmsr(CPU_IM_CONFIG, msr);

	/* Data Memory Subsystem Configuration register
	 * set EVCTONRPL bit, required when L2 cache is enabled in victim mode
	 */
	msr = rdmsr(CPU_DM_CONFIG0);
	msr.lo |= 0x4000;
	wrmsr(CPU_DM_CONFIG0, msr);

	/* invalidate L2 cache */
	msr.hi = 0x00;
	msr.lo = 0x10;
	wrmsr(CPU_BC_L2_CONF, msr);

	/* Enable L2 cache */
	msr.hi = 0x00;
	msr.lo = 0x0f;
	wrmsr(CPU_BC_L2_CONF, msr);

	printk(BIOS_DEBUG, "L2 cache enabled\n");
}

static void setup_lx_cache(void)
{
	msr_t msr;

	enable_L1_cache();
	enable_L2_cache();

	// Make sure all INVD instructions are treated as WBINVD.  We do this
	// because we've found some programs which require this behavior.
	msr = rdmsr(CPU_DM_CONFIG0);
	msr.lo |= DM_CONFIG0_LOWER_WBINVD_SET;
	wrmsr(CPU_DM_CONFIG0, msr);

	x86_enable_cache();
	wbinvd();
}

uintptr_t restore_top_of_low_cacheable(void)
{
	uint32_t systop;
	msr_t msr;

	msr = rdmsr(MSR_GLIU0_SYSMEM);
	systop = ((msr.hi & 0xFF) << 24) | ((msr.lo & 0xFFF00000) >> 8);
	systop += 0x1000;	/* 4K */

	return systop;
}

/****************************************************************************/
/* *	northbridge_init_early */
/* **/
/* *	Core Logic initialization:  Host bridge*/
/* **/
/* ***************************************************************************/
void northbridge_init_early(void)
{
	int i;
	printk(BIOS_DEBUG, "Enter %s\n", __func__);

	for (i = 0; gliutables[i]; i++)
		GLIUInit(gliutables[i]);

	/*  Now that the descriptor to memory is set up. */
	/*  The memory controller needs one read to synch its lines before it can be used. */
	read32(zeroptr);

	GeodeLinkPriority();

	setup_lx_cache();

	rom_shadow_settings();

	GLPCIInit();

	ClockGatingInit();

	__asm__ __volatile__("FINIT\n");
	printk(BIOS_DEBUG, "Exit %s\n", __func__);
}