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/*
* Cisco router simulation platform.
* Copyright (c) 2005,2006 Christophe Fillot (cf@utc.fr)
*
* PCI devices.
*
* Very interesting docs:
* http://www.science.unitn.it/~fiorella/guidelinux/tlk/node72.html
* http://www.science.unitn.it/~fiorella/guidelinux/tlk/node76.html
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include "cpu.h"
#include "vm.h"
#include "dynamips.h"
#include "memory.h"
#include "device.h"
#define DEBUG_PCI 1
#define GET_PCI_ADDR(offset,mask) ((pci_bus->pci_addr >> offset) & mask)
/* Trigger a PCI device IRQ */
void pci_dev_trigger_irq(vm_instance_t *vm,struct pci_device *dev)
{
if (dev->irq != -1)
vm_set_irq(vm,dev->irq);
}
/* Clear a PCI device IRQ */
void pci_dev_clear_irq(vm_instance_t *vm,struct pci_device *dev)
{
if (dev->irq != -1)
vm_clear_irq(vm,dev->irq);
}
/* Swapping function */
static inline m_uint32_t pci_swap(m_uint32_t val,int swap)
{
return((swap) ? swap32(val) : val);
}
/* PCI bus lookup */
struct pci_bus *pci_bus_lookup(struct pci_bus *pci_bus_root,int bus)
{
struct pci_bus *next_bus,*cur_bus = pci_bus_root;
struct pci_bridge *bridge;
while(cur_bus != NULL) {
if (cur_bus->bus == bus)
return cur_bus;
/* Try busses behind PCI bridges */
next_bus = NULL;
for(bridge=cur_bus->bridge_list;bridge;bridge=bridge->next) {
/*
* Specific case: final bridge with no checking of secondary
* bus number. Dynamically programming.
*/
if (bridge->skip_bus_check) {
pci_bridge_set_bus_info(bridge,cur_bus->bus,bus,bus);
bridge->skip_bus_check = FALSE;
return bridge->pci_bus;
}
if ((bus >= bridge->sec_bus) && (bus <= bridge->sub_bus)) {
next_bus = bridge->pci_bus;
break;
}
}
cur_bus = next_bus;
}
return NULL;
}
/* PCI device local lookup */
struct pci_device *pci_dev_lookup_local(struct pci_bus *pci_bus,
int device,int function)
{
struct pci_device *dev;
for(dev=pci_bus->dev_list;dev;dev=dev->next)
if ((dev->device == device) && (dev->function == function))
return dev;
return NULL;
}
/* PCI Device lookup */
struct pci_device *pci_dev_lookup(struct pci_bus *pci_bus_root,
int bus,int device,int function)
{
struct pci_bus *req_bus;
/* Find, try to find the request bus */
if (!(req_bus = pci_bus_lookup(pci_bus_root,bus)))
return NULL;
/* Walk through devices present on this bus */
return pci_dev_lookup_local(req_bus,device,function);
}
/* Handle the address register access */
void pci_dev_addr_handler(cpu_gen_t *cpu,struct pci_bus *pci_bus,
u_int op_type,int swap,m_uint64_t *data)
{
if (op_type == MTS_WRITE)
pci_bus->pci_addr = pci_swap(*data,swap);
else
*data = pci_swap(pci_bus->pci_addr,swap);
}
/*
* Handle the data register access.
*
* The address of requested register is first written at address 0xcf8
* (with pci_dev_addr_handler).
*
* The data is read/written at address 0xcfc.
*/
void pci_dev_data_handler(cpu_gen_t *cpu,struct pci_bus *pci_bus,
u_int op_type,int swap,m_uint64_t *data)
{
struct pci_device *dev;
int bus,device,function,reg;
if (op_type == MTS_READ)
*data = 0x0;
/*
* http://www.mega-tokyo.com/osfaq2/index.php/PciSectionOfPentiumVme
*
* 31 : Enable Bit
* 30 - 24 : Reserved
* 23 - 16 : Bus Number
* 15 - 11 : Device Number
* 10 - 8 : Function Number
* 7 - 2 : Register Number
* 1 - 0 : always 00
*/
bus = GET_PCI_ADDR(16,0xff);
device = GET_PCI_ADDR(11,0x1f);
function = GET_PCI_ADDR(8,0x7);
reg = GET_PCI_ADDR(0,0xff);
/* Find the corresponding PCI device */
dev = pci_dev_lookup(pci_bus,bus,device,function);
#if DEBUG_PCI
if (op_type == MTS_READ) {
cpu_log(cpu,"PCI","read request at pc=0x%llx: "
"bus=%d,device=%d,function=%d,reg=0x%2.2x\n",
cpu_get_pc(cpu), bus, device, function, reg);
} else {
cpu_log(cpu,"PCI","write request (data=0x%8.8x) at pc=0x%llx: "
"bus=%d,device=%d,function=%d,reg=0x%2.2x\n",
pci_swap(*data,swap), cpu_get_pc(cpu),
bus, device, function, reg);
}
#endif
if (!dev) {
if (op_type == MTS_READ) {
cpu_log(cpu,"PCI","read request for unknown device at pc=0x%llx "
"(bus=%d,device=%d,function=%d,reg=0x%2.2x).\n",
cpu_get_pc(cpu), bus, device, function, reg);
} else {
cpu_log(cpu,"PCI","write request (data=0x%8.8x) for unknown device "
"at pc=0x%llx (bus=%d,device=%d,function=%d,reg=0x%2.2x).\n",
pci_swap(*data,swap), cpu_get_pc(cpu),
bus, device, function, reg);
}
/* Returns an invalid device ID */
if ((op_type == MTS_READ) && (reg == PCI_REG_ID))
*data = 0xffffffff;
} else {
if (op_type == MTS_WRITE) {
if (dev->write_register != NULL)
dev->write_register(cpu,dev,reg,pci_swap(*data,swap));
} else {
if (reg == PCI_REG_ID)
*data = pci_swap((dev->product_id << 16) | dev->vendor_id,swap);
else {
if (dev->read_register != NULL)
*data = pci_swap(dev->read_register(cpu,dev,reg),swap);
}
}
}
}
/* Add a PCI bridge */
struct pci_bridge *pci_bridge_add(struct pci_bus *pci_bus)
{
struct pci_bridge *bridge;
if (!pci_bus)
return NULL;
if (!(bridge = malloc(sizeof(*bridge)))) {
fprintf(stderr,"pci_bridge_add: unable to create new PCI bridge.\n");
return NULL;
}
memset(bridge,0,sizeof(*bridge));
bridge->pri_bus = pci_bus->bus;
bridge->sec_bus = -1;
bridge->sub_bus = -1;
bridge->pci_bus = NULL;
/* Insert the bridge in the double-linked list */
bridge->next = pci_bus->bridge_list;
bridge->pprev = &pci_bus->bridge_list;
if (pci_bus->bridge_list != NULL)
pci_bus->bridge_list->pprev = &bridge->next;
pci_bus->bridge_list = bridge;
return bridge;
}
/* Remove a PCI bridge from the double-linked list */
static inline void pci_bridge_remove_from_list(struct pci_bridge *bridge)
{
if (bridge->next)
bridge->next->pprev = bridge->pprev;
if (bridge->pprev)
*(bridge->pprev) = bridge->next;
}
/* Remove a PCI bridge */
void pci_bridge_remove(struct pci_bridge *bridge)
{
if (bridge != NULL) {
pci_bridge_remove_from_list(bridge);
free(bridge);
}
}
/* Map secondary bus to a PCI bridge */
void pci_bridge_map_bus(struct pci_bridge *bridge,struct pci_bus *pci_bus)
{
if (bridge != NULL) {
bridge->pci_bus = pci_bus;
if (bridge->pci_bus != NULL)
bridge->pci_bus->bus = bridge->sec_bus;
}
}
/* Set PCI bridge bus info */
void pci_bridge_set_bus_info(struct pci_bridge *bridge,
int pri_bus,int sec_bus,int sub_bus)
{
if (bridge != NULL) {
bridge->pri_bus = pri_bus;
bridge->sec_bus = sec_bus;
bridge->sub_bus = sub_bus;
if (bridge->pci_bus != NULL)
bridge->pci_bus->bus = bridge->sec_bus;
}
}
/* Add a PCI device */
struct pci_device *
pci_dev_add(struct pci_bus *pci_bus,char *name,
u_int vendor_id,u_int product_id,
int device,int function,int irq,
void *priv_data,pci_init_t init,
pci_reg_read_t read_register,
pci_reg_write_t write_register)
{
struct pci_device *dev;
if (!pci_bus)
return NULL;
if ((dev = pci_dev_lookup_local(pci_bus,device,function)) != NULL) {
fprintf(stderr,"pci_dev_add: bus %s, device %d, function %d already "
"registered (device '%s').\n",
pci_bus->name,device,function,dev->name);
return NULL;
}
/* we can create safely the new device */
if (!(dev = malloc(sizeof(*dev)))) {
fprintf(stderr,"pci_dev_add: unable to create new PCI device.\n");
return NULL;
}
memset(dev,0,sizeof(*dev));
dev->name = name;
dev->vendor_id = vendor_id;
dev->product_id = product_id;
dev->pci_bus = pci_bus;
dev->device = device;
dev->function = function;
dev->irq = irq;
dev->priv_data = priv_data;
dev->init = init;
dev->read_register = read_register;
dev->write_register = write_register;
/* Insert the device in the double-linked list */
dev->next = pci_bus->dev_list;
dev->pprev = &pci_bus->dev_list;
if (pci_bus->dev_list != NULL)
pci_bus->dev_list->pprev = &dev->next;
pci_bus->dev_list = dev;
if (init) init(dev);
return dev;
}
/* Add a basic PCI device that just returns a Vendor/Product ID */
struct pci_device *
pci_dev_add_basic(struct pci_bus *pci_bus,
char *name,u_int vendor_id,u_int product_id,
int device,int function)
{
return(pci_dev_add(pci_bus,name,vendor_id,product_id,
device,function,-1,NULL,
NULL,NULL,NULL));
}
/* Remove a device from the double-linked list */
static inline void pci_dev_remove_from_list(struct pci_device *dev)
{
if (dev->next)
dev->next->pprev = dev->pprev;
if (dev->pprev)
*(dev->pprev) = dev->next;
}
/* Remove a PCI device */
void pci_dev_remove(struct pci_device *dev)
{
if (dev != NULL) {
pci_dev_remove_from_list(dev);
free(dev);
}
}
/* Remove a PCI device given its ID (bus,device,function) */
int pci_dev_remove_by_id(struct pci_bus *pci_bus,
int bus,int device,int function)
{
struct pci_device *dev;
if (!(dev = pci_dev_lookup(pci_bus,bus,device,function)))
return(-1);
pci_dev_remove(dev);
return(0);
}
/* Remove a PCI device given its name */
int pci_dev_remove_by_name(struct pci_bus *pci_bus,char *name)
{
struct pci_device *dev,*next;
int count = 0;
for(dev=pci_bus->dev_list;dev;dev=next) {
next = dev->next;
if (!strcmp(dev->name,name)) {
pci_dev_remove(dev);
count++;
}
}
return(count);
}
/* Create a PCI bus */
struct pci_bus *pci_bus_create(char *name,int bus)
{
struct pci_bus *d;
if (!(d = malloc(sizeof(*d)))) {
fprintf(stderr,"pci_bus_create: unable to create PCI info.\n");
return NULL;
}
memset(d,0,sizeof(*d));
d->name = strdup(name);
d->bus = bus;
return d;
}
/* Delete a PCI bus */
void pci_bus_remove(struct pci_bus *pci_bus)
{
struct pci_device *dev,*next;
struct pci_bridge *bridge,*next_bridge;
if (pci_bus) {
/* Remove all devices */
for(dev=pci_bus->dev_list;dev;dev=next) {
next = dev->next;
free(dev);
}
/* Remove all bridges */
for(bridge=pci_bus->bridge_list;bridge;bridge=next_bridge) {
next_bridge = bridge->next;
free(bridge);
}
/* Free the structure itself */
free(pci_bus->name);
free(pci_bus);
}
}
/* Read a configuration register of a PCI bridge */
static m_uint32_t pci_bridge_read_reg(cpu_gen_t *cpu,struct pci_device *dev,
int reg)
{
struct pci_bridge *bridge = dev->priv_data;
m_uint32_t val = 0;
switch(reg) {
case 0x18:
return(bridge->cfg_reg_bus);
default:
if (bridge->fallback_read != NULL)
val = bridge->fallback_read(cpu,dev,reg);
/* Returns appropriate PCI bridge class code if nothing defined */
if ((reg == 0x08) && !val)
val = 0x06040000;
return(val);
}
}
/* Write a configuration register of a PCI bridge */
static void pci_bridge_write_reg(cpu_gen_t *cpu,struct pci_device *dev,
int reg,m_uint32_t value)
{
struct pci_bridge *bridge = dev->priv_data;
u_int pri_bus,sec_bus,sub_bus;
switch(reg) {
case 0x18:
bridge->cfg_reg_bus = value;
sub_bus = (value >> 16) & 0xFF;
sec_bus = (value >> 8) & 0xFF;
pri_bus = value & 0xFF;
/* Modify the PCI bridge settings */
vm_log(cpu->vm,"PCI",
"PCI bridge %d,%d,%d -> pri: %2.2u, sec: %2.2u, sub: %2.2u\n",
dev->pci_bus->bus,dev->device,dev->function,
pri_bus,sec_bus,sub_bus);
pci_bridge_set_bus_info(bridge,pri_bus,sec_bus,sub_bus);
break;
default:
if (bridge->fallback_write != NULL)
bridge->fallback_write(cpu,dev,reg,value);
}
}
/* Create a PCI bridge device */
struct pci_device *pci_bridge_create_dev(struct pci_bus *pci_bus,char *name,
u_int vendor_id,u_int product_id,
int device,int function,
struct pci_bus *sec_bus,
pci_reg_read_t fallback_read,
pci_reg_write_t fallback_write)
{
struct pci_bridge *bridge;
struct pci_device *dev;
/* Create the PCI bridge structure */
if (!(bridge = pci_bridge_add(pci_bus)))
return NULL;
/* Create the PCI device corresponding to the bridge */
dev = pci_dev_add(pci_bus,name,vendor_id,product_id,device,function,-1,
bridge,NULL,pci_bridge_read_reg,pci_bridge_write_reg);
if (!dev)
goto err_pci_dev;
/* Keep the associated PCI device for this bridge */
bridge->pci_dev = dev;
/* Set the fallback functions */
bridge->fallback_read = fallback_read;
bridge->fallback_write = fallback_write;
/* Map the secondary bus (disabled at startup) */
pci_bridge_map_bus(bridge,sec_bus);
return dev;
err_pci_dev:
pci_bridge_remove(bridge);
return NULL;
}
/* Show PCI device list of the specified bus */
static void pci_bus_show_dev_list(struct pci_bus *pci_bus)
{
struct pci_device *dev;
struct pci_bridge *bridge;
char bus_id[32];
if (!pci_bus)
return;
if (pci_bus->bus != -1) {
snprintf(bus_id,sizeof(bus_id),"%2d",pci_bus->bus);
} else {
strcpy(bus_id,"XX");
}
for(dev=pci_bus->dev_list;dev;dev=dev->next) {
printf(" %-18s: ID %4.4x:%4.4x, Bus %s, Dev. %2d, Func. %2d",
dev->name,dev->vendor_id,dev->product_id,
bus_id,dev->device,dev->function);
if (dev->irq != -1)
printf(", IRQ: %d\n",dev->irq);
else
printf("\n");
}
for(bridge=pci_bus->bridge_list;bridge;bridge=bridge->next)
pci_bus_show_dev_list(bridge->pci_bus);
}
/* Show PCI device list */
void pci_dev_show_list(struct pci_bus *pci_bus)
{
if (!pci_bus)
return;
printf("PCI Bus \"%s\" Device list:\n",pci_bus->name);
pci_bus_show_dev_list(pci_bus);
printf("\n");
}
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