X-Git-Url: http://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/7af790aa0395322cc6e91e7cdbbd83612e871489..aafd94b868ebaf4cb47549653ecf58951289ac93:/bootrom/bootrom.c diff --git a/bootrom/bootrom.c b/bootrom/bootrom.c index 3dba041e..c8c695cc 100644 --- a/bootrom/bootrom.c +++ b/bootrom/bootrom.c @@ -1,5 +1,9 @@ #include +struct common_area common_area __attribute__((section(".commonarea"))); +unsigned int start_addr, end_addr, bootrom_unlocked; +extern char _bootrom_start, _bootrom_end, _flash_start, _flash_end; + static void ConfigClocks(void) { // we are using a 16 MHz crystal as the basis for everything @@ -63,7 +67,7 @@ static void Fatal(void) void UsbPacketReceived(BYTE *packet, int len) { - int i; + int i, dont_ack=0; UsbCommand *c = (UsbCommand *)packet; volatile DWORD *p; @@ -73,40 +77,116 @@ void UsbPacketReceived(BYTE *packet, int len) switch(c->cmd) { case CMD_DEVICE_INFO: + dont_ack = 1; + c->cmd = CMD_DEVICE_INFO; + c->ext1 = DEVICE_INFO_FLAG_BOOTROM_PRESENT | DEVICE_INFO_FLAG_CURRENT_MODE_BOOTROM | + DEVICE_INFO_FLAG_UNDERSTANDS_START_FLASH; + if(common_area.flags.osimage_present) c->ext1 |= DEVICE_INFO_FLAG_OSIMAGE_PRESENT; + UsbSendPacket(packet, len); break; case CMD_SETUP_WRITE: - p = (volatile DWORD *)0; + /* The temporary write buffer of the embedded flash controller is mapped to the + * whole memory region, only the last 8 bits are decoded. + */ + p = (volatile DWORD *)&_flash_start; for(i = 0; i < 12; i++) { p[i+c->ext1] = c->d.asDwords[i]; } break; case CMD_FINISH_WRITE: - p = (volatile DWORD *)0; + p = (volatile DWORD *)&_flash_start; for(i = 0; i < 4; i++) { p[i+60] = c->d.asDwords[i]; } - MC_FLASH_COMMAND = MC_FLASH_COMMAND_KEY | - MC_FLASH_COMMAND_PAGEN(c->ext1/FLASH_PAGE_SIZE_BYTES) | - FCMD_WRITE_PAGE; + /* Check that the address that we are supposed to write to is within our allowed region */ + if( ((c->ext1+FLASH_PAGE_SIZE_BYTES-1) >= end_addr) || (c->ext1 < start_addr) ) { + /* Disallow write */ + dont_ack = 1; + c->cmd = CMD_NACK; + UsbSendPacket(packet, len); + } else { + /* Translate address to flash page and do flash, update here for the 512k part */ + MC_FLASH_COMMAND = MC_FLASH_COMMAND_KEY | + MC_FLASH_COMMAND_PAGEN((c->ext1-(int)&_flash_start)/FLASH_PAGE_SIZE_BYTES) | + FCMD_WRITE_PAGE; + } while(!(MC_FLASH_STATUS & MC_FLASH_STATUS_READY)) ; break; case CMD_HARDWARE_RESET: + USB_D_PLUS_PULLUP_OFF(); + RSTC_CONTROL = RST_CONTROL_KEY | RST_CONTROL_PROCESSOR_RESET; break; - + + case CMD_START_FLASH: + if(c->ext3 == START_FLASH_MAGIC) bootrom_unlocked = 1; + else bootrom_unlocked = 0; + { + int prot_start = (int)&_bootrom_start; + int prot_end = (int)&_bootrom_end; + int allow_start = (int)&_flash_start; + int allow_end = (int)&_flash_end; + int cmd_start = c->ext1; + int cmd_end = c->ext2; + + /* Only allow command if the bootrom is unlocked, or the parameters are outside of the protected + * bootrom area. In any case they must be within the flash area. + */ + if( (bootrom_unlocked || ((cmd_start >= prot_end) || (cmd_end < prot_start))) + && (cmd_start >= allow_start) && (cmd_end <= allow_end) ) { + start_addr = cmd_start; + end_addr = cmd_end; + } else { + start_addr = end_addr = 0; + dont_ack = 1; + c->cmd = CMD_NACK; + UsbSendPacket(packet, len); + } + } + break; + default: Fatal(); break; } - c->cmd = CMD_ACK; - UsbSendPacket(packet, len); + if(!dont_ack) { + c->cmd = CMD_ACK; + UsbSendPacket(packet, len); + } } +static void flash_mode(int externally_entered) +{ + start_addr = 0; + end_addr = 0; + bootrom_unlocked = 0; + + UsbStart(); + for(;;) { + WDT_HIT(); + + UsbPoll(TRUE); + + if(!externally_entered && !BUTTON_PRESS()) { + /* Perform a reset to leave flash mode */ + USB_D_PLUS_PULLUP_OFF(); + LED_B_ON(); + RSTC_CONTROL = RST_CONTROL_KEY | RST_CONTROL_PROCESSOR_RESET; + for(;;); + } + if(externally_entered && BUTTON_PRESS()) { + /* Let the user's button press override the automatic leave */ + externally_entered = 0; + } + } +} + +extern char _osimage_entry; void BootROM(void) { //------------ @@ -152,39 +232,55 @@ void BootROM(void) LED_C_ON(); LED_B_OFF(); LED_A_OFF(); - - // if 512K FLASH part - TODO make some defines :) - if ((DBGU_CIDR | 0xf00) == 0xa00) { - MC_FLASH_MODE0 = MC_FLASH_MODE_FLASH_WAIT_STATES(1) | - MC_FLASH_MODE_MASTER_CLK_IN_MHZ(0x48); - MC_FLASH_MODE1 = MC_FLASH_MODE_FLASH_WAIT_STATES(1) | - MC_FLASH_MODE_MASTER_CLK_IN_MHZ(0x48); - } else { - MC_FLASH_MODE0 = MC_FLASH_MODE_FLASH_WAIT_STATES(0) | - MC_FLASH_MODE_MASTER_CLK_IN_MHZ(48); - } - - // Initialize all system clocks + + // if 512K FLASH part - TODO make some defines :) + if ((DBGU_CIDR | 0xf00) == 0xa00) { + MC_FLASH_MODE0 = MC_FLASH_MODE_FLASH_WAIT_STATES(1) | + MC_FLASH_MODE_MASTER_CLK_IN_MHZ(0x48); + MC_FLASH_MODE1 = MC_FLASH_MODE_FLASH_WAIT_STATES(1) | + MC_FLASH_MODE_MASTER_CLK_IN_MHZ(0x48); + } else { + MC_FLASH_MODE0 = MC_FLASH_MODE_FLASH_WAIT_STATES(0) | + MC_FLASH_MODE_MASTER_CLK_IN_MHZ(48); + } + + // Initialize all system clocks ConfigClocks(); - + LED_A_ON(); - - if(BUTTON_PRESS()) { - UsbStart(); - } - - for(;;) { - WDT_HIT(); - - UsbPoll(TRUE); - - if(!BUTTON_PRESS()) { - USB_D_PLUS_PULLUP_OFF(); - LED_B_ON(); - - // jump to Flash address 0x10000 (LSBit set for thumb mode, 0x100000 added for Flash base address) - asm("ldr r3, = 0x00110001\n"); - asm("bx r3\n"); - } + + int common_area_present = 0; + switch(RSTC_STATUS & RST_STATUS_TYPE_MASK) { + case RST_STATUS_TYPE_WATCHDOG: + case RST_STATUS_TYPE_SOFTWARE: + case RST_STATUS_TYPE_USER: + /* In these cases the common_area in RAM should be ok, retain it if it's there */ + if(common_area.magic == COMMON_AREA_MAGIC && common_area.version == 1) { + common_area_present = 1; + } + break; + default: /* Otherwise, initialize it from scratch */ + break; + } + + if(!common_area_present){ + /* Common area not ok, initialize it */ + int i; for(i=0; i