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diff --git a/libgloss/hp74x/README b/libgloss/hp74x/README new file mode 100644 index 000000000..f27af18c9 --- /dev/null +++ b/libgloss/hp74x/README @@ -0,0 +1,156 @@ +*** 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 |