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/* |
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* Cisco router simulation platform. |
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* Copyright (c) 2007 Christophe Fillot (cf@utc.fr) |
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* |
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* Byte-swapping device. |
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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 <assert.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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struct bswap_data { |
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/* VM object info */ |
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vm_obj_t vm_obj; |
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|
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/* VM instance */ |
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vm_instance_t *vm; |
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|
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/* Byte-swap device */ |
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struct vdevice dev; |
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|
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/* Physical address base for rewrite */ |
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m_uint64_t phys_base; |
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}; |
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|
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/* |
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* Byte swapped access. |
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*/ |
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static void *dev_bswap_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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struct bswap_data *d = dev->priv_data; |
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m_uint64_t paddr; |
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|
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paddr = d->phys_base + offset; |
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|
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//printf("access to paddr = 0x%llx\n",paddr); |
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|
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switch(op_size) { |
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case 1: |
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if (op_type == MTS_READ) |
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*data = physmem_copy_u8_from_vm(d->vm,paddr ^ 0x03); |
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else |
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physmem_copy_u8_to_vm(d->vm,paddr ^ 0x03,*data); |
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break; |
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|
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case 2: |
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if (op_type == MTS_READ) |
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*data = swap16(physmem_copy_u16_from_vm(d->vm,paddr ^ 0x02)); |
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else |
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physmem_copy_u16_to_vm(d->vm,paddr ^ 0x02,swap16(*data)); |
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break; |
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|
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case 4: |
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if (op_type == MTS_READ) |
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*data = swap32(physmem_copy_u32_from_vm(d->vm,paddr)); |
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else |
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physmem_copy_u32_to_vm(d->vm,paddr,swap32(*data)); |
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break; |
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} |
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|
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return NULL; |
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} |
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|
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/* Shutdown an byte-swap device */ |
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void dev_bswap_shutdown(vm_instance_t *vm,struct bswap_data *d) |
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{ |
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if (d != NULL) { |
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/* Remove the alias, the byte-swapped and the main device */ |
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dev_remove(vm,&d->dev); |
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|
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/* Free the structure itself */ |
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free(d); |
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} |
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} |
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|
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/* Initialized a byte-swap device */ |
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int dev_bswap_init(vm_instance_t *vm,char *name, |
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m_uint64_t paddr,m_uint32_t len, |
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m_uint64_t remap_addr) |
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{ |
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struct bswap_data *d; |
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|
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if (!(d = malloc(sizeof(*d)))) { |
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fprintf(stderr,"BSWAP: 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 = vm; |
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d->phys_base = remap_addr; |
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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_bswap_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_bswap_access; |
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d->dev.priv_data = d; |
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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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} |
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