diff options
Diffstat (limited to 'src/devices/machine/ds1204.cpp')
-rw-r--r-- | src/devices/machine/ds1204.cpp | 375 |
1 files changed, 375 insertions, 0 deletions
diff --git a/src/devices/machine/ds1204.cpp b/src/devices/machine/ds1204.cpp new file mode 100644 index 00000000000..a35624a3c6a --- /dev/null +++ b/src/devices/machine/ds1204.cpp @@ -0,0 +1,375 @@ +// license:BSD-3-Clause +// copyright-holders:smf +/* + * ds1204.c + * + * Electronic Key + * + */ + +#include <stdio.h> +#include "emu.h" +#include "ds1204.h" + +#define VERBOSE_LEVEL ( 0 ) + +inline void ATTR_PRINTF( 3, 4 ) ds1204_device::verboselog( int n_level, const char *s_fmt, ... ) +{ + if( VERBOSE_LEVEL >= n_level ) + { + va_list v; + char buf[ 32768 ]; + va_start( v, s_fmt ); + vsprintf( buf, s_fmt, v ); + va_end( v ); + logerror( "%s: ds1204(%s) %s", machine().describe_context(), tag(), buf ); + } +} + +// device type definition +const device_type DS1204 = &device_creator<ds1204_device>; + +ds1204_device::ds1204_device( const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock ) + : device_t( mconfig, DS1204, "DS1204", tag, owner, clock, "ds1204", __FILE__ ), + device_nvram_interface(mconfig, *this), + m_rst( 0 ), + m_clk( 0 ), + m_dqw( 0 ) +{ +} + +void ds1204_device::device_start() +{ + new_state( STATE_STOP ); + m_dqr = DQ_HIGH_IMPEDANCE; + + memset( m_command, 0, sizeof( m_command ) ); + memset( m_compare_register, 0, sizeof( m_compare_register ) ); + + save_item( NAME( m_rst ) ); + save_item( NAME( m_clk ) ); + save_item( NAME( m_dqw ) ); + save_item( NAME( m_dqr ) ); + save_item( NAME( m_state ) ); + save_item( NAME( m_bit ) ); + save_item( NAME( m_command ) ); + save_item( NAME( m_compare_register ) ); + save_item( NAME( m_unique_pattern ) ); + save_item( NAME( m_identification ) ); + save_item( NAME( m_security_match ) ); + save_item( NAME( m_secure_memory ) ); +} + +void ds1204_device::nvram_default() +{ + memset( m_unique_pattern, 0, sizeof( m_unique_pattern ) ); + memset( m_identification, 0, sizeof( m_identification ) ); + memset( m_security_match, 0, sizeof( m_security_match ) ); + memset( m_secure_memory, 0, sizeof( m_secure_memory ) ); + + int expected_bytes = sizeof( m_unique_pattern ) + sizeof( m_identification ) + sizeof( m_security_match ) + sizeof( m_secure_memory ); + + if( !m_region ) + { + logerror( "ds1204(%s) region not found\n", tag() ); + } + else if( m_region->bytes() != expected_bytes ) + { + logerror( "ds1204(%s) region length 0x%x expected 0x%x\n", tag(), m_region->bytes(), expected_bytes ); + } + else + { + UINT8 *region = m_region->base(); + + memcpy( m_unique_pattern, region, sizeof( m_unique_pattern ) ); region += sizeof( m_unique_pattern ); + memcpy( m_identification, region, sizeof( m_identification ) ); region += sizeof( m_identification ); + memcpy( m_security_match, region, sizeof( m_security_match ) ); region += sizeof( m_security_match ); + memcpy( m_secure_memory, region, sizeof( m_secure_memory ) ); region += sizeof( m_secure_memory ); + } +} + +void ds1204_device::nvram_read( emu_file &file ) +{ + file.read( m_unique_pattern, sizeof( m_unique_pattern ) ); + file.read( m_identification, sizeof( m_identification ) ); + file.read( m_security_match, sizeof( m_security_match ) ); + file.read( m_secure_memory, sizeof( m_secure_memory ) ); +} + +void ds1204_device::nvram_write( emu_file &file ) +{ + file.write( m_unique_pattern, sizeof( m_unique_pattern ) ); + file.write( m_identification, sizeof( m_identification ) ); + file.write( m_security_match, sizeof( m_security_match ) ); + file.write( m_secure_memory, sizeof( m_secure_memory ) ); +} + +void ds1204_device::new_state( int state ) +{ + m_state = state; + m_bit = 0; +} + +void ds1204_device::writebit( UINT8 *buffer ) +{ + if( m_clk ) + { + int index = m_bit / 8; + int mask = 1 << ( m_bit % 8 ); + + if( m_dqw ) + { + buffer[ index ] |= mask; + } + else + { + buffer[ index ] &= ~mask; + } + + m_bit++; + } +} + +void ds1204_device::readbit( UINT8 *buffer ) +{ + if( !m_clk ) + { + int index = m_bit / 8; + int mask = 1 << ( m_bit % 8 ); + + if( buffer[ index ] & mask ) + { + m_dqr = 1; + } + else + { + m_dqr = 0; + } + } + else + { + m_bit++; + } +} + +WRITE_LINE_MEMBER( ds1204_device::write_rst ) +{ + if( m_rst != state ) + { + m_rst = state; + verboselog( 2, "rst=%d\n", m_rst ); + + if( m_rst ) + { + new_state( STATE_PROTOCOL ); + } + else + { + switch( m_state ) + { + case STATE_WRITE_IDENTIFICATION: + verboselog( 0, "reset during write identification (bit=%d)\n", m_bit ); + break; + case STATE_WRITE_SECURITY_MATCH: + verboselog( 0, "reset during write security match (bit=%d)\n", m_bit ); + break; + case STATE_WRITE_SECURE_MEMORY: + verboselog( 0, "reset during write secure memory (bit=%d)\n", m_bit ); + break; + } + + new_state( STATE_STOP ); + m_dqr = DQ_HIGH_IMPEDANCE; + } + } +} + +WRITE_LINE_MEMBER( ds1204_device::write_clk ) +{ + if( m_clk != state ) + { + m_clk = state; + verboselog( 2, "clk=%d (bit=%d)\n", m_clk, m_bit ); + + if( m_clk ) + { + m_dqr = DQ_HIGH_IMPEDANCE; + } + + switch( m_state ) + { + case STATE_PROTOCOL: + writebit( m_command ); + + if( m_bit == 24 ) + { + verboselog( 1, "-> command %02x %02x %02x (%02x %02x)\n", + m_command[ 0 ], m_command[ 1 ], m_command[ 2 ], m_unique_pattern[ 0 ], m_unique_pattern[ 1 ] ); + + if( m_command[ 0 ] == COMMAND_READ && m_command[ 1 ] == ( m_unique_pattern[ 0 ] | CYCLE_NORMAL ) && m_command[ 2 ] == m_unique_pattern[ 1 ] ) + { + new_state( STATE_READ_IDENTIFICATION ); + } + else if( m_command[ 0 ] == COMMAND_WRITE && m_command[ 1 ] == ( m_unique_pattern[ 0 ] | CYCLE_NORMAL ) && m_command[ 2 ] == m_unique_pattern[ 1 ] ) + { + new_state( STATE_READ_IDENTIFICATION ); + } + else if( m_command[ 0 ] == COMMAND_WRITE && m_command[ 1 ] == ( m_unique_pattern[ 0 ] | CYCLE_PROGRAM ) && m_command[ 2 ] == m_unique_pattern[ 1 ] ) + { + new_state( STATE_WRITE_IDENTIFICATION ); + } + else + { + new_state( STATE_STOP ); + } + } + break; + + case STATE_READ_IDENTIFICATION: + readbit( m_identification ); + + if( m_bit == 64 ) + { + verboselog( 1, "<- identification %02x %02x %02x %02x %02x %02x %02x %02x\n", + m_identification[ 0 ], m_identification[ 1 ], m_identification[ 2 ], m_identification[ 3 ], + m_identification[ 4 ], m_identification[ 5 ], m_identification[ 6 ], m_identification[ 7 ] ); + + new_state( STATE_WRITE_COMPARE_REGISTER ); + } + break; + + case STATE_WRITE_COMPARE_REGISTER: + writebit( m_compare_register ); + + if( m_bit == 64 ) + { + verboselog( 1, "-> compare register %02x %02x %02x %02x %02x %02x %02x %02x (%02x %02x %02x %02x %02x %02x %02x %02x)\n", + m_compare_register[ 0 ], m_compare_register[ 1 ], m_compare_register[ 2 ], m_compare_register[ 3 ], + m_compare_register[ 4 ], m_compare_register[ 5 ], m_compare_register[ 6 ], m_compare_register[ 7 ], + m_security_match[ 0 ], m_security_match[ 1 ], m_security_match[ 2 ], m_security_match[ 3 ], + m_security_match[ 4 ], m_security_match[ 5 ], m_security_match[ 6 ], m_security_match[ 7 ] ); + + if( memcmp( m_compare_register, m_security_match, sizeof( m_compare_register ) ) == 0 ) + { + if( m_command[ 0 ] == COMMAND_READ ) + { + new_state( STATE_READ_SECURE_MEMORY ); + } + else + { + new_state( STATE_WRITE_SECURE_MEMORY ); + } + } + else + { + new_state( STATE_OUTPUT_GARBLED_DATA ); + } + } + break; + + case STATE_READ_SECURE_MEMORY: + readbit( m_secure_memory ); + + if( m_bit == 128 ) + { + verboselog( 1, "<- secure memory %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x\n", + m_secure_memory[ 0 ], m_secure_memory[ 1 ], m_secure_memory[ 2 ], m_secure_memory[ 3 ], + m_secure_memory[ 4 ], m_secure_memory[ 5 ], m_secure_memory[ 6 ], m_secure_memory[ 7 ], + m_secure_memory[ 8 ], m_secure_memory[ 9 ], m_secure_memory[ 10 ], m_secure_memory[ 11 ], + m_secure_memory[ 12 ], m_secure_memory[ 13 ], m_secure_memory[ 14 ], m_secure_memory[ 15 ] ); + + new_state( STATE_STOP ); + } + break; + + case STATE_WRITE_SECURE_MEMORY: + writebit( m_secure_memory ); + + if( m_bit == 128 ) + { + verboselog( 1, "-> secure memory %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x\n", + m_secure_memory[ 0 ], m_secure_memory[ 1 ], m_secure_memory[ 2 ], m_secure_memory[ 3 ], + m_secure_memory[ 4 ], m_secure_memory[ 5 ], m_secure_memory[ 6 ], m_secure_memory[ 7 ], + m_secure_memory[ 8 ], m_secure_memory[ 9 ], m_secure_memory[ 10 ], m_secure_memory[ 11 ], + m_secure_memory[ 12 ], m_secure_memory[ 13 ], m_secure_memory[ 14 ], m_secure_memory[ 15 ] ); + + new_state( STATE_STOP ); + } + break; + + case STATE_WRITE_IDENTIFICATION: + writebit( m_identification ); + + if( m_bit == 64 ) + { + verboselog( 1, "-> identification %02x %02x %02x %02x %02x %02x %02x %02x\n", + m_identification[ 0 ], m_identification[ 1 ], m_identification[ 2 ], m_identification[ 3 ], + m_identification[ 4 ], m_identification[ 5 ], m_identification[ 6 ], m_identification[ 7 ] ); + + new_state( STATE_WRITE_SECURITY_MATCH ); + } + break; + + case STATE_WRITE_SECURITY_MATCH: + writebit( m_security_match ); + + if( m_bit == 64 ) + { + verboselog( 1, ">- security match %02x %02x %02x %02x %02x %02x %02x %02x\n", + m_security_match[ 0 ], m_security_match[ 1 ], m_security_match[ 2 ], m_security_match[ 3 ], + m_security_match[ 4 ], m_security_match[ 5 ], m_security_match[ 6 ], m_security_match[ 7 ] ); + + new_state( STATE_STOP ); + } + break; + + case STATE_OUTPUT_GARBLED_DATA: + if( !m_clk && m_command[ 0 ] == COMMAND_READ ) + { + m_dqr = machine().rand() & 1; + m_bit++; + } + else if( m_clk && m_command[ 0 ] == COMMAND_WRITE ) + { + m_bit++; + } + + if( m_bit == 64 ) + { + if( m_command[ 0 ] == COMMAND_READ ) + { + verboselog( 1, "<- random\n" ); + } + else + { + verboselog( 1, "-> ignore\n" ); + } + + new_state( STATE_STOP ); + } + break; + } + } +} + +WRITE_LINE_MEMBER( ds1204_device::write_dq ) +{ + if( m_dqw != state ) + { + m_dqw = state; + + verboselog( 2, "dqw=%d\n", m_dqw ); + } +} + +READ_LINE_MEMBER( ds1204_device::read_dq ) +{ + if( m_dqr == DQ_HIGH_IMPEDANCE ) + { + verboselog( 2, "dqr=high impedance\n" ); + return 0; + } + + verboselog( 2, "dqr=%d (bit=%d)\n", m_dqr, m_bit ); + return m_dqr; +} |