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/* |
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* Cisco router simulation platform. |
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* Copyright (C) 2005,2006 Christophe Fillot. All rights reserved. |
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* |
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* Zeroed memory zone. |
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*/ |
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|
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include <unistd.h> |
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#include <pthread.h> |
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#include <errno.h> |
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|
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#include "cpu.h" |
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#include "vm.h" |
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#include "dynamips.h" |
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#include "memory.h" |
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#include "device.h" |
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|
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/* Zero zone private data */ |
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struct zero_data { |
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vm_obj_t vm_obj; |
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struct vdevice dev; |
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}; |
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|
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/* |
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* dev_zero_access() |
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*/ |
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void *dev_zero_access(cpu_gen_t *cpu,struct vdevice *dev, |
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m_uint32_t offset,u_int op_size,u_int op_type, |
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m_uint64_t *data) |
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{ |
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if (op_type == MTS_READ) |
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*data = 0; |
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|
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return NULL; |
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} |
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|
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/* Shutdown a zeroed memory zone */ |
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void dev_zero_shutdown(vm_instance_t *vm,struct zero_data *d) |
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{ |
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if (d != NULL) { |
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dev_remove(vm,&d->dev); |
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free(d); |
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} |
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} |
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|
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/* Initialized a zeroed memory zone */ |
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int dev_zero_init(vm_instance_t *vm,char *name,m_uint64_t paddr,m_uint32_t len) |
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{ |
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struct zero_data *d; |
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|
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if (!(d = malloc(sizeof(*d)))) { |
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fprintf(stderr,"ZERO: unable to create device.\n"); |
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return(-1); |
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} |
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|
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vm_object_init(&d->vm_obj); |
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d->vm_obj.name = name; |
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d->vm_obj.data = d; |
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d->vm_obj.shutdown = (vm_shutdown_t)dev_zero_shutdown; |
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|
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dev_init(&d->dev); |
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d->dev.name = name; |
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d->dev.phys_addr = paddr; |
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d->dev.phys_len = len; |
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d->dev.handler = dev_zero_access; |
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|
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/* Map this device to the VM */ |
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vm_bind_device(vm,&d->dev); |
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vm_object_add(vm,&d->vm_obj); |
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return(0); |
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} |