path: root/src/northbridge/amd/amdk8/northbridge.c

#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 <device/hypertransport.h>
#include <stdlib.h>
#include <string.h>
#include <bitops.h>
#include <cpu/cpu.h>
#include "chip.h"
#include "root_complex/chip.h"
#include "northbridge.h"
#include "amdk8.h"
#include <cpu/x86/lapic.h>

#define FX_DEVS 8
static device_t __f0_dev[FX_DEVS];
static device_t __f1_dev[FX_DEVS];

#if 0
static void debug_fx_devs(void)
{
	int i;
	for (i = 0; i < FX_DEVS; i++) {
		device_t dev;
		dev = __f0_dev[i];
		if (dev) {
			printk_debug("__f0_dev[%d]: %s bus: %p\n",
				i, dev_path(dev), dev->bus);
		}
		dev = __f1_dev[i];
		if (dev) {
			printk_debug("__f1_dev[%d]: %s bus: %p\n",
				i, dev_path(dev), dev->bus);
		}
	}
}
#endif

static void get_fx_devs(void)
{
	int i;
	if (__f1_dev[0]) {
		return;
	}
	for (i = 0; i < FX_DEVS; i++) {
		__f0_dev[i] = dev_find_slot(0, PCI_DEVFN(0x18 + i, 0));
		__f1_dev[i] = dev_find_slot(0, PCI_DEVFN(0x18 + i, 1));
	}
	if (!__f1_dev[0]) {
		die("Cannot find 0:0x18.1\n");
	}
}

static uint32_t f1_read_config32(unsigned reg)
{
	get_fx_devs();
	return pci_read_config32(__f1_dev[0], reg);
}

static void f1_write_config32(unsigned reg, uint32_t value)
{
	int i;
	get_fx_devs();
	for (i = 0; i < FX_DEVS; i++) {
		device_t dev;
		dev = __f1_dev[i];
		if (dev && dev->enabled) {
			pci_write_config32(dev, reg, value);
		}
	}
}

static unsigned int amdk8_nodeid(device_t dev)
{
	return (dev->path.u.pci.devfn >> 3) - 0x18;
}

static unsigned int amdk8_scan_chains(device_t dev, unsigned int max)
{
	unsigned nodeid;
	unsigned link;
	nodeid = amdk8_nodeid(dev);
#if 0
	printk_debug("%s amdk8_scan_chains max: %d starting...\n", 
		     dev_path(dev), max);
#endif
	for (link = 0; link < dev->links; link++) {
		uint32_t link_type;
		uint32_t busses, config_busses;
		unsigned free_reg, config_reg;
		dev->link[link].cap = 0x80 + (link *0x20);
		do {
			link_type = pci_read_config32(dev, dev->link[link].cap + 0x18);
		} while(link_type & ConnectionPending);
		if (!(link_type & LinkConnected)) {
			continue;
		}
		do {
			link_type = pci_read_config32(dev, dev->link[link].cap + 0x18);
		} while(!(link_type & InitComplete));
		if (!(link_type & NonCoherent)) {
			continue;
		}
		/* See if there is an available configuration space mapping
		 * register in function 1. */
		free_reg = 0;
		for (config_reg = 0xe0; config_reg <= 0xec; config_reg += 4) {
			uint32_t config;
			config = f1_read_config32(config_reg);
			if (!free_reg && ((config & 3) == 0)) {
				free_reg = config_reg;
				continue;
			}
			if (((config & 3) == 3) && 
			    (((config >> 4) & 7) == nodeid) &&
			    (((config >> 8) & 3) == link)) {
				break;
			}
		}
		if (free_reg && (config_reg > 0xec)) {
			config_reg = free_reg;
		}
		/* If we can't find an available configuration space mapping
		 * register skip this bus */
		if (config_reg > 0xec) {
			continue;
		}

		/* Set up the primary, secondary and subordinate bus numbers.
		 * We have no idea how many busses are behind this bridge yet,
		 * so we set the subordinate bus number to 0xff for the moment.
		 */
		dev->link[link].secondary = ++max;
		dev->link[link].subordinate = 0xff;

		/* Read the existing primary/secondary/subordinate bus
		 * number configuration.
		 */
		busses = pci_read_config32(dev, dev->link[link].cap + 0x14);
		config_busses = f1_read_config32(config_reg);

		/* Configure the bus numbers for this bridge: the configuration
		 * transactions will not be propagates by the bridge if it is
		 * not correctly configured
		 */
		busses &= 0xff000000;
		busses |= (((unsigned int)(dev->bus->secondary) << 0) |
			   ((unsigned int)(dev->link[link].secondary) << 8) |
			   ((unsigned int)(dev->link[link].subordinate) << 16));
		pci_write_config32(dev, dev->link[link].cap + 0x14, busses);

		config_busses &= 0x000fc88;
		config_busses |= 
			(3 << 0) |  /* rw enable, no device compare */
			(( nodeid & 7) << 4) | 
			(( link & 3 ) << 8) |  
			((dev->link[link].secondary) << 16) |
			((dev->link[link].subordinate) << 24);
		f1_write_config32(config_reg, config_busses);

#if 0
		printk_debug("%s Hyper transport scan link: %d max: %d\n", 
			dev_path(dev), link, max);
#endif
		/* Now we can scan all of the subordinate busses i.e. the
		 * chain on the hypertranport link */
		max = hypertransport_scan_chain(&dev->link[link], max);

#if 0
		printk_debug("%s Hyper transport scan link: %d new max: %d\n",
			dev_path(dev), link, max);
#endif

		/* We know the number of busses behind this bridge.  Set the
		 * subordinate bus number to it's real value
		 */
		dev->link[link].subordinate = max;
		busses = (busses & 0xff00ffff) |
			((unsigned int) (dev->link[link].subordinate) << 16);
		pci_write_config32(dev, dev->link[link].cap + 0x14, busses);

		config_busses = (config_busses & 0x00ffffff) |
			(dev->link[link].subordinate << 24);
		f1_write_config32(config_reg, config_busses);
#if 0
		printk_debug("%s Hypertransport scan link: %d done\n",
			dev_path(dev), link);
#endif
	}
#if 0
	printk_debug("%s amdk8_scan_chains max: %d done\n", 
		dev_path(dev), max);
#endif
	return max;
}

static int reg_useable(unsigned reg, device_t goal_dev, unsigned goal_nodeid,
		       unsigned goal_link)
{
	struct resource *res;
	unsigned nodeid, link;
	int result;
	res = 0;
	for (nodeid = 0; !res && (nodeid < 8); nodeid++) {
		device_t dev;
		dev = __f0_dev[nodeid];
		for (link = 0; !res && (link < 3); link++) {
			res = probe_resource(dev, 0x100 + (reg | link));
		}
	}
	result = 2;
	if (res) {
		result = 0;
		if ((goal_link == (link - 1)) && 
		    (goal_nodeid == (nodeid - 1)) &&
		    (res->flags <= 1)) {
			result = 1;
		}
	}
#if 0
	printk_debug("reg: %02x result: %d gnodeid: %u glink: %u nodeid: %u link: %u\n",
		     reg, result, goal_nodeid, goal_link, nodeid, link);
#endif
	return result;
}

static struct resource *amdk8_find_iopair(device_t dev, unsigned nodeid, unsigned link)
{
	struct resource *resource;
	unsigned free_reg, reg;
	resource = 0;
	free_reg = 0;
	for (reg = 0xc0; reg <= 0xd8; reg += 0x8) {
		int result;
		result = reg_useable(reg, dev, nodeid, link);
		if (result == 1) {
			/* I have been allocated this one */
			break;
		}
		else if (result > 1) {
			/* I have a free register pair */
			free_reg = reg;
		}
	}
	if (reg > 0xd8) {
		reg = free_reg;
	}
	if (reg > 0) {
		resource = new_resource(dev, 0x100 + (reg | link));
	}
	return resource;
}

static struct resource *amdk8_find_mempair(device_t dev, unsigned nodeid, unsigned link)
{
	struct resource *resource;
	unsigned free_reg, reg;
	resource = 0;
	free_reg = 0;
	for (reg = 0x80; reg <= 0xb8; reg += 0x8) {
		int result;
		result = reg_useable(reg, dev, nodeid, link);
		if (result == 1) {
			/* I have been allocated this one */
			break;
		}
		else if (result > 1) {
			/* I have a free register pair */
			free_reg = reg;
		}
	}
	if (reg > 0xb8) {
		reg = free_reg;
	}
	if (reg > 0) {
		resource = new_resource(dev, 0x100 + (reg | link));
	}
	return resource;
}

static void amdk8_link_read_bases(device_t dev, unsigned nodeid, unsigned link)
{
	struct resource *resource;
	
	/* Initialize the io space constraints on the current bus */
	resource =  amdk8_find_iopair(dev, nodeid, link);
	if (resource) {
		resource->base  = 0;
		resource->size  = 0;
		resource->align = log2(HT_IO_HOST_ALIGN);
		resource->gran  = log2(HT_IO_HOST_ALIGN);
		resource->limit = 0xffffUL;
		resource->flags = IORESOURCE_IO;
		compute_allocate_resource(&dev->link[link], resource, 
			IORESOURCE_IO, IORESOURCE_IO);
	}

	/* Initialize the prefetchable memory constraints on the current bus */
	resource = amdk8_find_mempair(dev, nodeid, link);
	if (resource) {
		resource->base  = 0;
		resource->size  = 0;
		resource->align = log2(HT_MEM_HOST_ALIGN);
		resource->gran  = log2(HT_MEM_HOST_ALIGN);
		resource->limit = 0xffffffffffULL;
		resource->flags = IORESOURCE_MEM | IORESOURCE_PREFETCH;
		compute_allocate_resource(&dev->link[link], resource, 
			IORESOURCE_MEM | IORESOURCE_PREFETCH, 
			IORESOURCE_MEM | IORESOURCE_PREFETCH);
	}

	/* Initialize the memory constraints on the current bus */
	resource = amdk8_find_mempair(dev, nodeid, link);
	if (resource) {
		resource->base  = 0;
		resource->size  = 0;
		resource->align = log2(HT_MEM_HOST_ALIGN);
		resource->gran  = log2(HT_MEM_HOST_ALIGN);
		resource->limit = 0xffffffffffULL;
		resource->flags = IORESOURCE_MEM;
		compute_allocate_resource(&dev->link[link], resource, 
			IORESOURCE_MEM | IORESOURCE_PREFETCH, 
			IORESOURCE_MEM);
	}
}

static void amdk8_read_resources(device_t dev)
{
	unsigned nodeid, link;
	nodeid = amdk8_nodeid(dev);
	for (link = 0; link < dev->links; link++) {
		if (dev->link[link].children) {
			amdk8_link_read_bases(dev, nodeid, link);
		}
	}
}

static void amdk8_set_resource(device_t dev, struct resource *resource, unsigned nodeid)
{
	resource_t rbase, rend;
	unsigned reg, link;
	char buf[50];

	/* Make certain the resource has actually been set */
	if (!(resource->flags & IORESOURCE_ASSIGNED)) {
		return;
	}

	/* If I have already stored this resource don't worry about it */
	if (resource->flags & IORESOURCE_STORED) {
		return;
	}
	
	/* Only handle PCI memory and IO resources */
	if (!(resource->flags & (IORESOURCE_MEM | IORESOURCE_IO)))
		return;

	/* Ensure I am actually looking at a resource of function 1 */
	if (resource->index < 0x100) {
		return;
	}
	/* Get the base address */
	rbase = resource->base;
	
	/* Get the limit (rounded up) */
	rend  = resource_end(resource);

	/* Get the register and link */
	reg  = resource->index & 0xfc;
	link = resource->index & 3;

	if (resource->flags & IORESOURCE_IO) {
		uint32_t base, limit;
		compute_allocate_resource(&dev->link[link], resource,
			IORESOURCE_IO, IORESOURCE_IO);
		base  = f1_read_config32(reg);
		limit = f1_read_config32(reg + 0x4);
		base  &= 0xfe000fcc;
		base  |= rbase  & 0x01fff000;
		base  |= 3;
		limit &= 0xfe000fc8;
		limit |= rend & 0x01fff000;
		limit |= (link & 3) << 4;
		limit |= (nodeid & 7);

		if (dev->link[link].bridge_ctrl & PCI_BRIDGE_CTL_VGA) {
			printk_spew("%s, enabling legacy VGA IO forwarding for %s link %s\n",
				    __func__, dev_path(dev), link);
			base |= PCI_IO_BASE_VGA_EN;
		}
		if (dev->link[link].bridge_ctrl & PCI_BRIDGE_CTL_NO_ISA) {
			base |= PCI_IO_BASE_NO_ISA;
		}
		
		f1_write_config32(reg + 0x4, limit);
		f1_write_config32(reg, base);
	}
	else if (resource->flags & IORESOURCE_MEM) {
		uint32_t base, limit;
		compute_allocate_resource(&dev->link[link], resource,
			IORESOURCE_MEM | IORESOURCE_PREFETCH,
			resource->flags & (IORESOURCE_MEM | IORESOURCE_PREFETCH));
		base  = f1_read_config32(reg);
		limit = f1_read_config32(reg + 0x4);
		base  &= 0x000000f0;
		base  |= (rbase >> 8) & 0xffffff00;
		base  |= 3;
		limit &= 0x00000048;
		limit |= (rend >> 8) & 0xffffff00;
		limit |= (link & 3) << 4;
		limit |= (nodeid & 7);
		f1_write_config32(reg + 0x4, limit);
		f1_write_config32(reg, base);
	}
	resource->flags |= IORESOURCE_STORED;
	sprintf(buf, " <node %d link %d>",
		nodeid, link);
	report_resource_stored(dev, resource, buf);
}

/**
 *
 * I tried to reuse the resource allocation code in amdk8_set_resource()
 * but it is too diffcult to deal with the resource allocation magic.
 */
static void amdk8_create_vga_resource(device_t dev, unsigned nodeid)
{
	struct resource *resource;
	unsigned link;
	uint32_t base, limit;
	unsigned reg;

	/* find out which link the VGA card is connected,
	 * we only deal with the 'first' vga card */
	for (link = 0; link < dev->links; link++) {
		if (dev->link[link].bridge_ctrl & PCI_BRIDGE_CTL_VGA) {
			break;
		}
	}

	printk_spew("%s: link %d has VGA device\n", __func__, link);

	/* no VGA card installed */
	if (link == dev->links)
		return;

	/* allocate a temp resrouce for legacy VGA buffer */
	resource = amdk8_find_mempair(dev, nodeid, link);
	resource->base = 0xa0000;
	resource->size = 0x20000;

	/* write the resource to the hardware */
	reg  = resource->index & 0xfc;
	base  = f1_read_config32(reg);
	limit = f1_read_config32(reg + 0x4);
	base  &= 0x000000f0;
	base  |= (resource->base >> 8) & 0xffffff00;
	base  |= 3;
	limit &= 0x00000048;
	limit |= ((resource->base + resource->size) >> 8) & 0xffffff00;
	limit |= (resource->index & 3) << 4;
	limit |= (nodeid & 7);
	f1_write_config32(reg + 0x4, limit);
	f1_write_config32(reg, base);

	/* release the temp resource */
	resource->flags = 0;
}

static void amdk8_set_resources(device_t dev)
{
	unsigned nodeid, link;
	int i;

	/* Find the nodeid */
	nodeid = amdk8_nodeid(dev);

	amdk8_create_vga_resource(dev, nodeid);
	
	/* Set each resource we have found */
	for (i = 0; i < dev->resources; i++) {
		amdk8_set_resource(dev, &dev->resource[i], nodeid);
	}

	for (link = 0; link < dev->links; link++) {
		struct bus *bus;
		bus = &dev->link[link];
		if (bus->children) {
			assign_resources(bus);
		}
	}
}

static void amdk8_enable_resources(device_t dev)
{
	pci_dev_enable_resources(dev);
	enable_childrens_resources(dev);
}

static void mcf0_control_init(struct device *dev)
{
	uint32_t cmd;

#if 0	
	printk_debug("NB: Function 0 Misc Control.. ");
#endif
#if 1
	/* improve latency and bandwith on HT */
	cmd = pci_read_config32(dev, 0x68);
	cmd &= 0xffff80ff;
	cmd |= 0x00004800;
	pci_write_config32(dev, 0x68, cmd );
#endif

#if 0	
	/* over drive the ht port to 1000 Mhz */
	cmd = pci_read_config32(dev, 0xa8);
	cmd &= 0xfffff0ff;
	cmd |= 0x00000600;
	pci_write_config32(dev, 0xdc, cmd );
#endif	
#if 0
	printk_debug("done.\n");
#endif
}

static struct device_operations northbridge_operations = {
	.read_resources   = amdk8_read_resources,
	.set_resources    = amdk8_set_resources,
	.enable_resources = amdk8_enable_resources,
	.init             = mcf0_control_init,
	.scan_bus         = amdk8_scan_chains,
	.enable           = 0,
	.ops_pci          = 0,
};


static struct pci_driver mcf0_driver __pci_driver = {
	.ops    = &northbridge_operations,
	.vendor = PCI_VENDOR_ID_AMD,
	.device = 0x1100,
};

#if CONFIG_CHIP_NAME == 1

struct chip_operations northbridge_amd_amdk8_ops = {
	CHIP_NAME("AMD K8 Northbridge")
	.enable_dev = 0,
};

#endif

static void pci_domain_read_resources(device_t dev)
{
	struct resource *resource;
	unsigned reg;

	/* Find the already assigned resource pairs */
	get_fx_devs();
	for (reg = 0x80; reg <= 0xd8; reg+= 0x08) {
		uint32_t base, limit;
		base  = f1_read_config32(reg);
		limit = f1_read_config32(reg + 0x04);
		/* Is this register allocated? */
		if ((base & 3) != 0) {
			unsigned nodeid, link;
			device_t dev;
			nodeid = limit & 7;
			link   = (limit >> 4) & 3;
			dev = __f0_dev[nodeid];
			if (dev) {
				/* Reserve the resource  */
				struct resource *resource;
				resource = new_resource(dev, 0x100 + (reg | link));
				if (resource) {
					resource->flags = 1;
				}
			}
		}
	}

	/* Initialize the system wide io space constraints */
	resource = new_resource(dev, IOINDEX_SUBTRACTIVE(0, 0));
	resource->base  = 0x400;
	resource->limit = 0xffffUL;
	resource->flags = IORESOURCE_IO | IORESOURCE_SUBTRACTIVE | IORESOURCE_ASSIGNED;

	/* Initialize the system wide memory resources constraints */
	resource = new_resource(dev, IOINDEX_SUBTRACTIVE(1, 0));
	resource->limit = 0xfcffffffffULL;
	resource->flags = IORESOURCE_MEM | IORESOURCE_SUBTRACTIVE | IORESOURCE_ASSIGNED;
}

static void ram_resource(device_t dev, unsigned long index,
			 unsigned long basek, unsigned long sizek)
{
	struct resource *resource;

	if (!sizek) {
		return;
	}
	resource = new_resource(dev, index);
	resource->base  = ((resource_t)basek) << 10;
	resource->size  = ((resource_t)sizek) << 10;
	resource->flags =  IORESOURCE_MEM | IORESOURCE_CACHEABLE | \
		IORESOURCE_FIXED | IORESOURCE_STORED | IORESOURCE_ASSIGNED;
}

static void tolm_test(void *gp, struct device *dev, struct resource *new)
{
	struct resource **best_p = gp;
	struct resource *best;
	best = *best_p;
	if (!best || (best->base > new->base)) {
		best = new;
	}
	*best_p = best;
}

static uint32_t find_pci_tolm(struct bus *bus)
{
	struct resource *min;
	uint32_t tolm;
	min = 0;
	search_bus_resources(bus, IORESOURCE_MEM, IORESOURCE_MEM, tolm_test, &min);
	tolm = 0xffffffffUL;
	if (min && tolm > min->base) {
		tolm = min->base;
	}
	return tolm;
}

static void pci_domain_set_resources(device_t dev)
{
	unsigned long mmio_basek;
	uint32_t pci_tolm;
	int i, idx;

	pci_tolm = find_pci_tolm(&dev->link[0]);

#warning "FIXME handle interleaved nodes"
	mmio_basek = pci_tolm >> 10;
	/* Round mmio_basek to something the processor can support */
	mmio_basek &= ~((1 << 6) -1);

#if 1
#warning "FIXME improve mtrr.c so we don't use up all of the mtrrs with a 64M MMIO hole"
	/* Round the mmio hold to 64M */
	mmio_basek &= ~((64*1024) - 1);
#endif

	idx = 10;
	for (i = 0; i < 8; i++) {
		uint32_t base, limit;
		unsigned basek, limitk, sizek;
		base  = f1_read_config32(0x40 + (i << 3));
		limit = f1_read_config32(0x44 + (i << 3));
		if ((base & ((1<<1)|(1<<0))) != ((1<<1)|(1<<0))) {
			continue;
		}
		basek = (base & 0xffff0000) >> 2;
		limitk = ((limit + 0x00010000) & 0xffff0000) >> 2;
		sizek = limitk - basek;

		/* see if we need a hole from 0xa0000 to 0xbffff */
		if ((basek < ((8*64)+(8*16))) && (sizek > ((8*64)+(16*16)))) {
			ram_resource(dev, idx++, basek, ((8*64)+(8*16)) - basek);
			basek = (8*64)+(16*16);
			sizek = limitk - ((8*64)+(16*16));
			
		}
		
		/* See if I need to split the region to accomodate pci memory space */
		if ((basek < mmio_basek) && (limitk > mmio_basek)) {
			if (basek < mmio_basek) {
				unsigned pre_sizek;
				pre_sizek = mmio_basek - basek;
				ram_resource(dev, idx++, basek, pre_sizek);
				sizek -= pre_sizek;
				basek = mmio_basek;
			}
			if ((basek + sizek) <= 4*1024*1024) {
				sizek = 0;
			}
			else {
				basek = 4*1024*1024;
				sizek -= (4*1024*1024 - mmio_basek);
			}
		}
		ram_resource(dev, idx++, basek, sizek);
	}
	assign_resources(&dev->link[0]);
}

static unsigned int pci_domain_scan_bus(device_t dev, unsigned int max)
{
	unsigned reg;
	/* Unmap all of the HT chains */
	for (reg = 0xe0; reg <= 0xec; reg += 4) {
		f1_write_config32(reg, 0);
	}
	max = pci_scan_bus(&dev->link[0], PCI_DEVFN(0x18, 0), 0xff, max);
	return max;
}

static struct device_operations pci_domain_ops = {
	.read_resources   = pci_domain_read_resources,
	.set_resources    = pci_domain_set_resources,
	.enable_resources = enable_childrens_resources,
	.init             = 0,
	.scan_bus         = pci_domain_scan_bus,
	.ops_pci_bus      = &pci_cf8_conf1,
};

#define APIC_ID_OFFSET 0x10

static unsigned int cpu_bus_scan(device_t dev, unsigned int max)
{
	struct bus *cpu_bus;
	device_t dev_mc;
	int i, j;
        int enable_apic_ext_id = 0;
        int bsp_apic_id = lapicid(); // bsp apicid
        int apic_id_offset = bsp_apic_id;	

        dev_mc = dev_find_slot(0, PCI_DEVFN(0x18, 0));
        if (pci_read_config32(dev_mc, 0x68) & ( HTTC_APIC_EXT_ID | HTTC_APIC_EXT_BRD_CST)) {
                enable_apic_ext_id = 1;
                if (apic_id_offset==0) {
			//bsp apic id is not changed
                        apic_id_offset = APIC_ID_OFFSET;
                }
        }

	/* Find which cpus are present */
	cpu_bus = &dev->link[0];
	for (i = 0; i < 8; i++) {
		device_t dev, cpu;
		struct device_path cpu_path;

                /* Find the cpu's memory controller */
                dev = dev_find_slot(0, PCI_DEVFN(0x18 + i, 3));
                if(!dev) { 
			// in case in mb Config.lb we move apic cluster before pci_domain and not set that for second CPU
			for(j=0; j<4; j++) {
	                        struct device dummy;
        	                uint32_t id;
                	        dummy.bus              = dev_mc->bus;
                        	dummy.path.type        = DEVICE_PATH_PCI;
	                        dummy.path.u.pci.devfn = PCI_DEVFN(0x18 + i, j);
        	                id = pci_read_config32(&dummy, PCI_VENDOR_ID);
                	        if (id != 0xffffffff && id != 0x00000000 && 
                        	        id != 0x0000ffff && id != 0xffff0000) {
                                	//create that for it
	                                dev = alloc_dev(dev_mc->bus, &dummy.path);
				}
                        }
                }  

		/* Build the cpu device path */
		cpu_path.type = DEVICE_PATH_APIC;
		cpu_path.u.apic.apic_id = i;

		/* See if I can find the cpu */
		cpu = find_dev_path(cpu_bus, &cpu_path);

		/* Enable the cpu if I have the processor */
		if (dev && dev->enabled) {
			if (!cpu) {
				cpu = alloc_dev(cpu_bus, &cpu_path);
			}
			if (cpu) {
				cpu->enabled = 1;
			}
		}
		
		/* Disable the cpu if I don't have the processor */
		if (cpu && (!dev || !dev->enabled)) {
			cpu->enabled = 0;
		}
		
		/* Report what I have done */
		if (cpu) {
                        if(enable_apic_ext_id) {
                        	if(cpu->path.u.apic.apic_id<apic_id_offset) {
					//all add offset except bsp cores
                                	if( (cpu->path.u.apic.apic_id > 0) || (bsp_apic_id!=0) )
                                        	cpu->path.u.apic.apic_id += apic_id_offset;
                                }
                        }  
			printk_debug("CPU: %s %s\n", dev_path(cpu),
				     cpu->enabled?"enabled":"disabled");
		}
	}
	return max;
}

static void cpu_bus_init(device_t dev)
{
	initialize_cpus(&dev->link[0]);
}

static void cpu_bus_noop(device_t dev) 
{
}

static struct device_operations cpu_bus_ops = {
	.read_resources   = cpu_bus_noop,
	.set_resources    = cpu_bus_noop,
	.enable_resources = cpu_bus_noop,
	.init             = cpu_bus_init,
	.scan_bus         = cpu_bus_scan,
};

static void root_complex_enable_dev(struct device *dev)
{
	/* Set the operations if it is a special bus type */
	if (dev->path.type == DEVICE_PATH_PCI_DOMAIN) {
		dev->ops = &pci_domain_ops;
	}
	else if (dev->path.type == DEVICE_PATH_APIC_CLUSTER) {
		dev->ops = &cpu_bus_ops;
	}
}

struct chip_operations northbridge_amd_amdk8_root_complex_ops = {
	CHIP_NAME("AMD K8 Root Complex")
	.enable_dev = root_complex_enable_dev,
};