| *** Registers |
| GR0 *always zero |
| GR1 scratch |
| GR2 normal return register |
| GR27 Global Data Pointer (Must be set in crt0) |
| GR30 SP stack pointer |
| GR31 milicode return pointer |
| |
| SR* Space registers |
| |
| CR24-31 Temporary Control Registers |
| CR14 Vector Table Register (like VBR on an m68020) |
| CR0 Put in a count, causes exception when decremented to 0. |
| |
| FORTH's magic number is 031240 |
| |
| *** |
| Series 700/800 |
| The following options are also supported: |
| |
| -snnn set the initial system load (ISL) start address to |
| nnn in the volume label. This is useful when |
| building boot media for Series 700/800 systems. |
| |
| -lnnn specifies the length in bytes of the ISL code in |
| the LIF volume. |
| |
| -ennn set the ISL entry point to nnn bytes from the |
| beginning of the ISL. For example, specifying - |
| e3272 means that the ISL entry point is 3272 |
| (decimal) bytes from the beginning of the ISL |
| object module. |
| |
| -Knnn forces the directory start location to be the |
| nearest multiple of nnn x 1024 bytes from the |
| beginning of the volume. This is necessary for |
| booting Series 700/800 systems from LIF media. |
| |
| -n xxx Sets the volume name to be xxx. |
| lifinit -v64000000 -d64 -nISL10 -K2 -s4096 -l61440 -e5336 this_lif |
| |
| # lifcp -- |
| # -r Forces RAW mode copying. (file type BIN (-23951)) |
| # -T Sets the file type of the directory entry. |
| # -Knnn forces each file copied in to begin on a nnn x |
| # 1024-byte boundary from the beginning of the volume |
| # Note: the word echoed below MUST be 10 characters exactly. |
| # |
| (echo "FORTH ") | lifcp -r -T-030001 -K2 - this_lif:AUTO |
| |
| |
| # |
| # somxtract infile outfile -- |
| # converts a series 800 file *only* into a raw image |
| |
| It turns out the native cc and our current gcc produce series 700 |
| output, so in this case it runs till if fills up the hard disk. |
| |
| *** rombootlf5 is a FORTH interpreter in a "boot" image. (it won't run on |
| the HP742 board) |
| |
| lifls -l rombootlf5 |
| volume ISL10 data size 249984 directory size 8 94/04/20 10:26:36 |
| filename type start size implement created |
| =============================================================== |
| ISL -12800 16 240 0 94/04/20 10:26:36 |
| HPUX -12928 256 496 0 94/04/20 10:26:37 |
| IOMAP -12960 752 1504 0 94/04/20 10:26:37 |
| AUTO -12289 2256 1 0 94/04/20 10:26:38 |
| FORTH -12960 2264 208 0 94/04/20 10:26:38 |
| HPFORTH ASCII 2472 420 0 94/04/20 10:26:38 |
| BOOTROM ASCII 2896 3849 0 94/04/20 10:26:40 |
| PAD1 -12290 6752 1172 0 94/04/20 10:26:40 |
| |
| *** The ISL is only needed when booting the raw hardware. As we're runing |
| on a monitor (barely) all we need is a crt0 that initiallizes the GR27 |
| Global Data Pointer and zero's bss. |
| |
| *** Initial Program Load |
| -------------------- |
| From page 11-56, architecture book. |
| 0x00000000 +------------------------------------+ 0 |
| | LIF_MAGIC | | |
| 0x00000004 +------------------------------------+ 4 |
| | | |
| 0x000000F0 +------------------------------------+ 240 |
| | IPL_ADDR | |
| 0x000000F4 +------------------------------------+ 244 |
| | IPL_SIZE | |
| 0x000000F8 +------------------------------------+ 248 |
| | IPL_ENTRY | |
| 0x000000FC +------------------------------------+ 252 |
| | | |
| IPL_ADDR +------------------------------------+ IPL_ADDR |
| | Position Independant | |
| | IPL Code | |
| | (including IPL_CHECKSUM) | |
| +------------------------------------+ IPL_ADDR + IPL_SIZE |
| | | |
| +------------------------------------+ |
| |
| IPL_ADDR 2 Kbyte aligned, nonzero |
| IPL_SIZE Multiple of 2Kbytes, <= 256 Kbytes |
| IPL_ENTRY Word aligned, less than IPL_SIZE |
| |
| Loads at IPL_START |
| |
| This is based on Cobra/Coral hardware: |
| LED register at 0xf080024 |
| I/O status register at 0xf0800000 |
| EEPROM at 0xf0810000 (LAN ID begins at byte 0) |
| |
| Here's a dump of the LIF volume header using "xd" (od with hex output) |
| |
| * |
| 00000f0 0000 1000 0000 9800 0000 0000 0000 0000 |
| ^^^^ |
| This is the size |
| * |
| 0000800 5445 5354 2020 2020 2020 a271 0000 0010 |
| ^^^^ ^^^^ ^^^^ ^^^^ ^^^^ ^^^^<-- this is the ipl offset |
| this is the vol name ^^^^<- this is the type |
| |
| 0000810 0000 0098 9407 1919 1426 8001 0000 0000 |
| ^^^^ |
| This is the ipl size |
| |
| Interupts |
| --------- |
| The vector table is access by %iva (%cr14). The address here must be a |
| multiple of 2048. The indexes are: |
| 1 high-priority |
| 2 power failure |
| 3 recovery counter |
| 4 external interrupt |
| 5 low-priority machine check |
| 6 instruction TLB miss/instruction page fault |
| 7 instruction memory protection |
| 8 illegal instruction |
| 9 break instruction |
| 10 priviledged operation |
| 11 priviledged register |
| 12 overflow |
| 13 conditional |
| 14 assist exception |
| 15 data TLB miss fault/data page fault |
| 16 non access instruction TLB miss fault |
| 17 non access page TLB miss fault/non access data page fault |
| 18 data memory protection/unaligned data reference |
| 19 data memory break |
| 20 TLB dirty bit |
| 21 page reference |
| 22 assist emulation |
| 23 higher-priority transfer |
| 24 lower-priority transfe |
| 25 taken branch |