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dpavlin |
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/* |
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* Cisco C7200 (Predator) simulation platform. |
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* Copyright (c) 2006 Christophe Fillot. All rights reserved. |
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* |
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* Cisco EEPROM manipulation functions. |
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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 <sys/types.h> |
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#include <sys/socket.h> |
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#include "utils.h" |
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#include "cisco_eeprom.h" |
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/* Get a byte from an EEPROM */ |
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int cisco_eeprom_get_byte(m_uint16_t *eeprom,size_t eeprom_len, |
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size_t offset,m_uint8_t *val) |
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{ |
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m_uint16_t tmp; |
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if (offset >= eeprom_len) |
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return(-1); |
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tmp = eeprom[offset >> 1]; |
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if (!(offset & 1)) |
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tmp >>= 8; |
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*val = tmp & 0xFF; |
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return(0); |
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} |
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/* Set a byte to an EEPROM */ |
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int cisco_eeprom_set_byte(m_uint16_t *eeprom,size_t eeprom_len, |
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size_t offset,m_uint8_t val) |
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{ |
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m_uint16_t tmp; |
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if (offset >= eeprom_len) |
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return(-1); |
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tmp = eeprom[offset >> 1]; |
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if (offset & 1) |
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tmp = (tmp & 0xFF00) | val; |
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else |
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tmp = (tmp & 0x00FF) | (val << 8); |
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eeprom[offset >> 1] = tmp; |
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return(0); |
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} |
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/* Get an EEPROM region */ |
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int cisco_eeprom_get_region(m_uint16_t *eeprom,size_t eeprom_len, |
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size_t offset,m_uint8_t *data,size_t data_len) |
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{ |
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size_t i; |
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for(i=0;i<data_len;i++) { |
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if (cisco_eeprom_get_byte(eeprom,eeprom_len,offset+i,&data[i]) == -1) |
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return(-1); |
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} |
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return(0); |
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} |
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/* Set an EEPROM region */ |
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int cisco_eeprom_set_region(m_uint16_t *eeprom,size_t eeprom_len, |
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size_t offset,m_uint8_t *data,size_t data_len) |
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{ |
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size_t i; |
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for(i=0;i<data_len;i++) { |
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if (cisco_eeprom_set_byte(eeprom,eeprom_len,offset+i,data[i]) == -1) |
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return(-1); |
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} |
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return(0); |
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} |
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/* Get a field of a Cisco EEPROM v4 */ |
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int cisco_eeprom_v4_get_field(m_uint16_t *eeprom,size_t eeprom_len, |
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m_uint8_t *type,m_uint8_t *len,size_t *offset) |
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{ |
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m_uint8_t tmp; |
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/* Read field type */ |
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if (cisco_eeprom_get_byte(eeprom,eeprom_len,(*offset)++,type) == -1) |
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return(-1); |
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/* No more field */ |
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if (*type == 0xFF) |
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return(0); |
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/* Get field length */ |
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tmp = (*type >> 6) & 0x03; |
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if (tmp == 0x03) { |
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/* Variable len */ |
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if (cisco_eeprom_get_byte(eeprom,eeprom_len,(*offset)++,&tmp) == -1) |
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return(-1); |
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*len = tmp & 0x0F; |
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} else { |
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/* Fixed len */ |
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*len = 1 << tmp; |
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} |
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return(1); |
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} |
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/* Dump a Cisco EEPROM with format version 4 */ |
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void cisco_eeprom_v4_dump(m_uint16_t *eeprom,size_t eeprom_len) |
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{ |
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m_uint8_t type,len,tmp; |
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size_t i,offset=2; |
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printf("Dumping EEPROM contents:\n"); |
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do { |
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/* Read field */ |
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if (cisco_eeprom_v4_get_field(eeprom,eeprom_len,&type,&len,&offset) < 1) |
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break; |
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printf(" Field 0x%2.2x: ",type); |
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for(i=0;i<len;i++) { |
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if (cisco_eeprom_get_byte(eeprom,eeprom_len,offset+i,&tmp) == -1) |
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break; |
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printf("%2.2x ",tmp); |
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} |
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printf("\n"); |
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offset += len; |
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}while(offset < eeprom_len); |
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} |
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/* Returns the offset of the specified field */ |
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int cisco_eeprom_v4_find_field(m_uint16_t *eeprom,size_t eeprom_len, |
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m_uint8_t field_type,size_t *field_offset) |
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{ |
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m_uint8_t type,len; |
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size_t offset=2; |
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do { |
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/* Read field */ |
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if (cisco_eeprom_v4_get_field(eeprom,eeprom_len,&type,&len,&offset) < 1) |
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break; |
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if (type == field_type) { |
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*field_offset = offset; |
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return(0); |
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} |
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offset += len; |
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}while(offset < eeprom_len); |
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return(-1); |
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} |