dev_c7200.c

思科路由器仿真器,用来仿7200系列得,可以在电脑上模拟路由器-Cisco router simulator, used to fake a 7200 series can be simulated

   /* Create PCI bus for PA Bay 0 (I/O Card, PCMCIA, Interfaces) */
   vm->pci_bus_pool[0] = pci_bus_create("PA Slot 0",-1);

   /* Create PCI busses for PA Bays 1,3,5 and PA Bays 2,4,6 */
   vm->pci_bus_pool[24] = pci_bus_create("PA Slots 1,3,5",-1);
   vm->pci_bus_pool[25] = pci_bus_create("PA Slots 2,4,6",-1);

   /* HyperTransport/PCI bridges */
   dev_ap1011_init(vm->pci_bus_pool[28],0,NULL);
   dev_ap1011_init(vm->pci_bus_pool[28],1,vm->pci_bus_pool[24]);
   dev_ap1011_init(vm->pci_bus_pool[28],2,vm->pci_bus_pool[25]);

   /* PCI bridge for I/O card device on MB0 */
   dev_dec21150_init(vm->pci_bus[0],3,vm->pci_bus_pool[0]);

   /* Create the hidden "I/O" PCI bridge for PCMCIA controller */
   c7200_create_io_pci_bridge(router,vm->pci_bus_pool[0]);

   /* Map the PA PCI busses */
   router->pa_bay[0].pci_map = vm->pci_bus[0];

   for(i=1;i<C7200_MAX_PA_BAYS;i++)
      router->pa_bay[i].pci_map = vm->pci_bus_pool[i];

   /* PCI bridges for PA Bays 1 to 6 */
   c7200_pa_init_pci_bridge(router,1,vm->pci_bus_pool[24],1);
   c7200_pa_init_pci_bridge(router,3,vm->pci_bus_pool[24],2);
   c7200_pa_init_pci_bridge(router,5,vm->pci_bus_pool[24],3);

   c7200_pa_init_pci_bridge(router,2,vm->pci_bus_pool[25],1);
   c7200_pa_init_pci_bridge(router,4,vm->pci_bus_pool[25],2);
   c7200_pa_init_pci_bridge(router,6,vm->pci_bus_pool[25],3);
   return(0);
}

/* Show C7200 hardware info */
void c7200_show_hardware(c7200_t *router)
{
   vm_instance_t *vm = router->vm;

   printf("C7200 instance '%s' (id %d):\n",vm->name,vm->instance_id);

   printf("  VM Status  : %d\n",vm->status);
   printf("  RAM size   : %u Mb\n",vm->ram_size);
   printf("  IOMEM size : %u Mb\n",vm->iomem_size);
   printf("  NVRAM size : %u Kb\n",vm->nvram_size);
   printf("  NPE model  : %s\n",router->npe_driver->npe_type);
   printf("  Midplane   : %s\n",router->midplane_type);
   printf("  IOS image  : %s\n\n",vm->ios_image);

   if (vm->debug_level > 0) {
      dev_show_list(vm);
      pci_dev_show_list(vm->pci_bus[0]);
      pci_dev_show_list(vm->pci_bus[1]);
      printf("\n");
   }
}

/* Initialize default parameters for a C7200 */
void c7200_init_defaults(c7200_t *router)
{
   vm_instance_t *vm = router->vm;
   n_eth_addr_t *m;
   m_uint16_t pid;

   pid = (m_uint16_t)getpid();

   /* Generate a chassis MAC address based on the instance ID */
   m = &router->mac_addr;
   m->eth_addr_byte[0] = vm_get_mac_addr_msb(vm);
   m->eth_addr_byte[1] = vm->instance_id & 0xFF;
   m->eth_addr_byte[2] = pid >> 8;
   m->eth_addr_byte[3] = pid & 0xFF;
   m->eth_addr_byte[4] = 0x00;
   m->eth_addr_byte[5] = 0x00;

   c7200_init_eeprom_groups(router);
   c7200_npe_set_type(router,C7200_DEFAULT_NPE_TYPE);
   c7200_midplane_set_type(router,C7200_DEFAULT_MIDPLANE);

   vm->ram_mmap        = C7200_DEFAULT_RAM_MMAP;
   vm->ram_size        = C7200_DEFAULT_RAM_SIZE;
   vm->rom_size        = C7200_DEFAULT_ROM_SIZE;
   vm->nvram_size      = C7200_DEFAULT_NVRAM_SIZE;
   vm->iomem_size      = 0;
   vm->conf_reg_setup  = C7200_DEFAULT_CONF_REG;
   vm->clock_divisor   = C7200_DEFAULT_CLOCK_DIV;
   vm->nvram_rom_space = C7200_NVRAM_ROM_RES_SIZE;

   vm->pcmcia_disk_size[0] = C7200_DEFAULT_DISK0_SIZE;
   vm->pcmcia_disk_size[1] = C7200_DEFAULT_DISK1_SIZE;

   /* Enable NVRAM operations to load/store configs */
   vm->nvram_extract_config = c7200_nvram_extract_config;
   vm->nvram_push_config = c7200_nvram_push_config;
}

/* Run the checklist */
int c7200_checklist(c7200_t *router)
{
   struct vm_instance *vm = router->vm;
   int res = 0;

   res += vm_object_check(vm,"ram");
   res += vm_object_check(vm,"rom");
   res += vm_object_check(vm,"nvram");
   res += vm_object_check(vm,"zero");

   if (res < 0)
      vm_error(vm,"incomplete initialization (no memory?)\n");

   return(res);
}

/* Initialize the C7200 Platform */
int c7200_init_platform(c7200_t *router)
{
   struct vm_instance *vm = router->vm;
   struct c7200_pa_bay *pa_bay;
   cpu_mips_t *cpu0;
   int i;

   /* Copy config register setup into "active" config register */
   vm->conf_reg = vm->conf_reg_setup;

   /* Create Console and AUX ports */
   vm_init_vtty(vm);

   /* Check that the amount of RAM is valid */
   if (vm->ram_size > router->npe_driver->max_ram_size) {
      vm_error(vm,"%u is not a valid RAM size for this NPE. "
               "Fallback to %u Mb.\n\n",
               vm->ram_size,router->npe_driver->max_ram_size);
   
      vm->ram_size = router->npe_driver->max_ram_size;
   }

   /* Create a CPU group */
   vm->cpu_group = cpu_group_create("System CPU");

   /* Initialize the virtual MIPS processor */
   if (!(cpu0 = cpu_create(vm,0))) {
      vm_error(vm,"unable to create CPU0!\n");
      return(-1);
   }

   /* Add this CPU to the system CPU group */
   cpu_group_add(vm->cpu_group,cpu0);
   vm->boot_cpu = cpu0;

   /* Mark the Network IO interrupt as high priority */
   cpu0->irq_idle_preempt[C7200_NETIO_IRQ] = TRUE;
   cpu0->irq_idle_preempt[C7200_GT64K_IRQ] = TRUE;

   /* Copy some parameters from VM to CPU0 (idle PC, ...) */
   cpu0->idle_pc = vm->idle_pc;

   if (vm->timer_irq_check_itv)
      cpu0->timer_irq_check_itv = vm->timer_irq_check_itv;

   /*
    * On the C7200, bit 33 of physical addresses is used to bypass L2 cache.
    * We clear it systematically.
    */
   cpu0->addr_bus_mask = C7200_ADDR_BUS_MASK;

   /* Remote emulator control */
   dev_remote_control_init(vm,0x16000000,0x1000);

   /* Bootflash */
   dev_bootflash_init(vm,"bootflash",C7200_BOOTFLASH_ADDR,(8 * 1048576));

   /* NVRAM and calendar */
   dev_nvram_init(vm,"nvram",router->npe_driver->nvram_addr,
                  vm->nvram_size*1024,&vm->conf_reg);

   /* Bit-bucket zone */
   dev_zero_init(vm,"zero",C7200_BITBUCKET_ADDR,0xc00000);

   /* Midplane FPGA */
   dev_c7200_mpfpga_init(router,C7200_MPFPGA_ADDR,0x1000);

   /* IO FPGA */
   if (dev_c7200_iofpga_init(router,C7200_IOFPGA_ADDR,0x1000) == -1)
      return(-1);

   /* Initialize the NPE board */
   if (router->npe_driver->npe_init(router) == -1)
      return(-1);

   /* Initialize RAM */
   vm_ram_init(vm,0x00000000ULL);

   /* Initialize ROM */
   if (!vm->rom_filename) {
      /* use embedded ROM */
      dev_rom_init(vm,"rom",C7200_ROM_ADDR,vm->rom_size*1048576);
   } else {
      /* use alternate ROM */
      dev_ram_init(vm,"rom",TRUE,TRUE,NULL,
                   C7200_ROM_ADDR,vm->rom_size*1048576);
   }

   /* PCI IO space */
   if (!(vm->pci_io_space = pci_io_data_init(vm,C7200_PCI_IO_ADDR)))
      return(-1);

   /* Cirrus Logic PD6729 (PCI-to-PCMCIA host adapter) */
   dev_clpd6729_init(vm,router->pcmcia_bus,
                     router->npe_driver->clpd6729_pci_dev,
                     vm->pci_io_space,0x402,0x403);

   /* Initialize Port Adapters */
   for(i=0;i<C7200_MAX_PA_BAYS;i++) {
      pa_bay = &router->pa_bay[i];

      if (!pa_bay->dev_type) 
         continue;

      if (c7200_pa_init(router,i) == -1) {
         vm_error(vm,"unable to create Port Adapter \"%s\"\n",
                  pa_bay->dev_type);
         return(-1);
      }
   }

   /* By default, initialize a C7200-IO-FE in slot 0 if nothing found */
   if (!router->pa_bay[0].drv_info) {
      c7200_pa_add_binding(router,"C7200-IO-FE",0);
      c7200_pa_init(router,0);
   }

   /* Verify the check list */
   if (c7200_checklist(router) == -1)
      return(-1);

   /* Show device list */
   c7200_show_hardware(router);
   return(0);
}

/* Boot the IOS image */
int c7200_boot_ios(c7200_t *router)
{   
   vm_instance_t *vm = router->vm;

   if (!vm->boot_cpu)
      return(-1);

   /* Suspend CPU activity since we will restart directly from ROM */
   vm_suspend(vm);

   /* Check that CPU activity is really suspended */
   if (cpu_group_sync_state(vm->cpu_group) == -1) {
      vm_error(vm,"unable to sync with system CPUs.\n");
      return(-1);
   }

   /* Reset the boot CPU */
   mips64_reset(vm->boot_cpu);

   /* Load IOS image */
   if (mips64_load_elf_image(vm->boot_cpu,vm->ios_image,
                             (vm->ghost_status == VM_GHOST_RAM_USE),
                             &vm->ios_entry_point) < 0)
   {
      vm_error(vm,"failed to load Cisco IOS image '%s'.\n",vm->ios_image);
      return(-1);
   }

   /* Launch the simulation */
   printf("\nC7200 '%s': starting simulation (CPU0 PC=0x%llx), "
          "JIT %sabled.\n",
          vm->name,vm->boot_cpu->pc,vm->jit_use ? "en":"dis");

   vm_log(vm,"C7200_BOOT",
          "starting instance (CPU0 PC=0x%llx,idle_pc=0x%llx,JIT %s)\n",
          vm->boot_cpu->pc,vm->boot_cpu->idle_pc,vm->jit_use ? "on":"off");
   
   /* Start main CPU */
   if (vm->ghost_status != VM_GHOST_RAM_GENERATE) {
      vm->status = VM_STATUS_RUNNING;
      cpu_start(vm->boot_cpu);
   } else {
      vm->status = VM_STATUS_SHUTDOWN;
   }
   return(0);
}

/* Initialize a Cisco 7200 instance */
int c7200_init_instance(c7200_t *router)
{
   vm_instance_t *vm = router->vm;
   m_uint32_t rom_entry_point;
   cpu_mips_t *cpu0;

   /* Initialize the C7200 platform */
   if (c7200_init_platform(router) == -1) {
      vm_error(vm,"unable to initialize the platform hardware.\n");
      return(-1);
   }

   /* Load IOS configuration file */
   if (vm->ios_config != NULL) {
      vm_nvram_push_config(vm,vm->ios_config);
      vm->conf_reg &= ~0x40;
   }

   /* Load ROM (ELF image or embedded) */
   cpu0 = vm->boot_cpu;
   rom_entry_point = (m_uint32_t)MIPS_ROM_PC;
   
   if ((vm->rom_filename != NULL) &&
       (mips64_load_elf_image(cpu0,vm->rom_filename,0,&rom_entry_point) < 0))
   {
      vm_error(vm,"unable to load alternate ROM '%s', "
               "fallback to embedded ROM.\n\n",vm->rom_filename);
      vm->rom_filename = NULL;
   }

   /* Load symbol file */
   if (vm->sym_filename) {
      mips64_sym_load_file(cpu0,vm->sym_filename);
      cpu0->sym_trace = 1;
   }

   return(c7200_boot_ios(router));
}

/* Stop a Cisco 7200 instance */
int c7200_stop_instance(c7200_t *router)
{
   vm_instance_t *vm = router->vm;

   printf("\nC7200 '%s': stopping simulation.\n",vm->name);
   vm_log(vm,"C7200_STOP","stopping simulation.\n");

   /* Stop all CPUs */
   if (vm->cpu_group != NULL) {
      vm_stop(vm);
      
      if (cpu_group_sync_state(vm->cpu_group) == -1) {
         vm_error(vm,"unable to sync with system CPUs.\n");
         return(-1);
      }
   }

   /* Free resources that were used during execution to emulate hardware */
   c7200_free_hw_ressources(router);
   vm_hardware_shutdown(vm);
   return(0);
}

/* Trigger an OIR event */
int c7200_trigger_oir_event(c7200_t *router,u_int slot_mask)
{
   /* An OIR IRQ without reason could lead to stop the system */
   if (!slot_mask) return(-1);

   router->oir_status = slot_mask;
   vm_set_irq(router->vm,C7200_OIR_IRQ);
   return(0);
}

/* Initialize a new PA while the virtual router is online (OIR) */
int c7200_pa_init_online(c7200_t *router,u_int pa_bay)
{
   vm_instance_t *vm = router->vm;

   if (!pa_bay) {
      vm_error(vm,"OIR not supported on slot 0.\n");
      return(-1);
   }

   /* 
    * Suspend CPU activity while adding new hardware (since we change the
    * memory maps).
    */
   vm_suspend(vm);

   /* Check that CPU activity is really suspended */
   if (cpu_group_sync_state(vm->cpu_group) == -1) {
      vm_error(vm,"unable to sync with system CPUs.\n");
      return(-1);
   }

   /* Add the new hardware elements */
   if (c7200_pa_init(router,pa_bay) == -1)
      return(-1);

   /* Resume normal operations */
   vm_resume(vm);

   /* Now, we can safely trigger the OIR event */
   c7200_trigger_oir_event(router,1 << pa_bay);
   return(0);
}

/* Stop a PA while the virtual router is online (OIR) */
int c7200_pa_stop_online(c7200_t *router,u_int pa_bay)
{   
   vm_instance_t *vm = router->vm;
   struct c7200_pa_bay *bay;

   if (!pa_bay) {
      vm_error(vm,"OIR not supported on slot 0.\n");
      return(-1);
   }

   if (!(bay = c7200_pa_get_info(router,pa_bay)))
      return(-1);

   /* The PA driver must be initialized */
   if (!bay->dev_type || !bay->pa_driver) {
      vm_error(vm,"trying to shut down empty slot %u.\n",pa_bay);
      return(-1);
   }

   /* Disable all NIOs to stop traffic forwarding */
   c7200_pa_disable_all_nio(router,pa_bay);

   /* We can safely trigger the OIR event */
   c7200_trigger_oir_event(router,1 << pa_bay);

   /* 
    * Suspend CPU activity while removing the hardware (since we change the
    * memory maps).
    */
   vm_suspend(vm);

   /* Device removal */
   c7200_pa_shutdown(router,pa_bay);

   /* Resume normal operations */
   vm_resume(vm);
   return(0);
}