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53c7xx_d.h_shipped
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/* DO NOT EDIT - Generated automatically by script_asm.pl */
static u32 SCRIPT[] = {
/*
; 53c710 driver. Modified from Drew Eckhardts driver
; for 53c810 by Richard Hirst [richard@sleepie.demon.co.uk]
;
; I have left the script for the 53c8xx family in here, as it is likely
; to be useful to see what I changed when bug hunting.
; NCR 53c810 driver, main script
; Sponsored by
; iX Multiuser Multitasking Magazine
; hm@ix.de
;
; Copyright 1993, 1994, 1995 Drew Eckhardt
; Visionary Computing
; (Unix and Linux consulting and custom programming)
; drew@PoohSticks.ORG
; +1 (303) 786-7975
;
; TolerANT and SCSI SCRIPTS are registered trademarks of NCR Corporation.
;
; PRE-ALPHA
;
; For more information, please consult
;
; NCR 53C810
; PCI-SCSI I/O Processor
; Data Manual
;
; NCR 53C710
; SCSI I/O Processor
; Programmers Guide
;
; NCR Microelectronics
; 1635 Aeroplaza Drive
; Colorado Springs, CO 80916
; 1+ (719) 578-3400
;
; Toll free literature number
; +1 (800) 334-5454
;
; IMPORTANT : This code is self modifying due to the limitations of
; the NCR53c7,8xx series chips. Persons debugging this code with
; the remote debugger should take this into account, and NOT set
; breakpoints in modified instructions.
;
; Design:
; The NCR53c7,8xx family of SCSI chips are busmasters with an onboard
; microcontroller using a simple instruction set.
;
; So, to minimize the effects of interrupt latency, and to maximize
; throughput, this driver offloads the practical maximum amount
; of processing to the SCSI chip while still maintaining a common
; structure.
;
; Where tradeoffs were needed between efficiency on the older
; chips and the newer NCR53c800 series, the NCR53c800 series
; was chosen.
;
; While the NCR53c700 and NCR53c700-66 lacked the facilities to fully
; automate SCSI transfers without host processor intervention, this
; isn't the case with the NCR53c710 and newer chips which allow
;
; - reads and writes to the internal registers from within the SCSI
; scripts, allowing the SCSI SCRIPTS(tm) code to save processor
; state so that multiple threads of execution are possible, and also
; provide an ALU for loop control, etc.
;
; - table indirect addressing for some instructions. This allows
; pointers to be located relative to the DSA ((Data Structure
; Address) register.
;
; These features make it possible to implement a mailbox style interface,
; where the same piece of code is run to handle I/O for multiple threads
; at once minimizing our need to relocate code. Since the NCR53c700/
; NCR53c800 series have a unique combination of features, making a
; a standard ingoing/outgoing mailbox system, costly, I've modified it.
;
; - Mailboxes are a mixture of code and data. This lets us greatly
; simplify the NCR53c810 code and do things that would otherwise
; not be possible.
;
; The saved data pointer is now implemented as follows :
;
; Control flow has been architected such that if control reaches
; munge_save_data_pointer, on a restore pointers message or
; reconnection, a jump to the address formerly in the TEMP register
; will allow the SCSI command to resume execution.
;
;
; Note : the DSA structures must be aligned on 32 bit boundaries,
; since the source and destination of MOVE MEMORY instructions
; must share the same alignment and this is the alignment of the
; NCR registers.
;
; For some systems (MVME166, for example) dmode is always the same, so don't
; waste time writing it
ABSOLUTE dsa_temp_lun = 0 ; Patch to lun for current dsa
ABSOLUTE dsa_temp_next = 0 ; Patch to dsa next for current dsa
ABSOLUTE dsa_temp_addr_next = 0 ; Patch to address of dsa next address
; for current dsa
ABSOLUTE dsa_temp_sync = 0 ; Patch to address of per-target
; sync routine
ABSOLUTE dsa_sscf_710 = 0 ; Patch to address of per-target
; sscf value (53c710)
ABSOLUTE dsa_temp_target = 0 ; Patch to id for current dsa
ABSOLUTE dsa_temp_addr_saved_pointer = 0; Patch to address of per-command
; saved data pointer
ABSOLUTE dsa_temp_addr_residual = 0 ; Patch to address of per-command
; current residual code
ABSOLUTE dsa_temp_addr_saved_residual = 0; Patch to address of per-command
; saved residual code
ABSOLUTE dsa_temp_addr_new_value = 0 ; Address of value for JUMP operand
ABSOLUTE dsa_temp_addr_array_value = 0 ; Address to copy to
ABSOLUTE dsa_temp_addr_dsa_value = 0 ; Address of this DSA value
;
; Once a device has initiated reselection, we need to compare it
; against the singly linked list of commands which have disconnected
; and are pending reselection. These commands are maintained in
; an unordered singly linked list of DSA structures, through the
; DSA pointers at their 'centers' headed by the reconnect_dsa_head
; pointer.
;
; To avoid complications in removing commands from the list,
; I minimize the amount of expensive (at eight operations per
; addition @ 500-600ns each) pointer operations which must
; be done in the NCR driver by precomputing them on the
; host processor during dsa structure generation.
;
; The fixed-up per DSA code knows how to recognize the nexus
; associated with the corresponding SCSI command, and modifies
; the source and destination pointers for the MOVE MEMORY
; instruction which is executed when reselected_ok is called
; to remove the command from the list. Similarly, DSA is
; loaded with the address of the next DSA structure and
; reselected_check_next is called if a failure occurs.
;
; Perhaps more concisely, the net effect of the mess is
;
; for (dsa = reconnect_dsa_head, dest = &reconnect_dsa_head,
; src = NULL; dsa; dest = &dsa->next, dsa = dsa->next) {
; src = &dsa->next;
; if (target_id == dsa->id && target_lun == dsa->lun) {
; *dest = *src;
; break;
; }
; }
;
; if (!dsa)
; error (int_err_unexpected_reselect);
; else
; longjmp (dsa->jump_resume, 0);
;
;
; Define DSA structure used for mailboxes
ENTRY dsa_code_template
dsa_code_template:
ENTRY dsa_code_begin
dsa_code_begin:
; RGH: Don't care about TEMP and DSA here
MOVE MEMORY 4, dsa_temp_addr_dsa_value, addr_scratch
at 0x00000000 : */ 0xc0000004,0x00000000,0x00000000,
/*
MOVE MEMORY 4, addr_scratch, saved_dsa
at 0x00000003 : */ 0xc0000004,0x00000000,0x00000000,
/*
; We are about to go and select the device, so must set SSCF bits
MOVE MEMORY 4, dsa_sscf_710, addr_scratch
at 0x00000006 : */ 0xc0000004,0x00000000,0x00000000,
/*
MOVE SCRATCH3 TO SFBR
at 0x00000009 : */ 0x72370000,0x00000000,
/*
MOVE SFBR TO SBCL
at 0x0000000b : */ 0x6a0b0000,0x00000000,
/*
MOVE MEMORY 4, saved_dsa, addr_dsa
at 0x0000000d : */ 0xc0000004,0x00000000,0x00000000,
/*
CALL select
at 0x00000010 : */ 0x88080000,0x000001f8,
/*
; Handle the phase mismatch which may have resulted from the
; MOVE FROM dsa_msgout if we returned here. The CLEAR ATN
; may or may not be necessary, and we should update script_asm.pl
; to handle multiple pieces.
CLEAR ATN
at 0x00000012 : */ 0x60000008,0x00000000,
/*
CLEAR ACK
at 0x00000014 : */ 0x60000040,0x00000000,
/*
; Replace second operand with address of JUMP instruction dest operand
; in schedule table for this DSA. Becomes dsa_jump_dest in 53c7,8xx.c.
ENTRY dsa_code_fix_jump
dsa_code_fix_jump:
MOVE MEMORY 4, NOP_insn, 0
at 0x00000016 : */ 0xc0000004,0x00000000,0x00000000,
/*
JUMP select_done
at 0x00000019 : */ 0x80080000,0x00000230,
/*
; wrong_dsa loads the DSA register with the value of the dsa_next
; field.
;
wrong_dsa:
; NOTE DSA is corrupt when we arrive here!
; Patch the MOVE MEMORY INSTRUCTION such that
; the destination address is the address of the OLD
; next pointer.
;
MOVE MEMORY 4, dsa_temp_addr_next, reselected_ok_patch + 8
at 0x0000001b : */ 0xc0000004,0x00000000,0x000007ec,
/*
;
; Move the _contents_ of the next pointer into the DSA register as
; the next I_T_L or I_T_L_Q tupple to check against the established
; nexus.
;
MOVE MEMORY 4, dsa_temp_next, addr_scratch
at 0x0000001e : */ 0xc0000004,0x00000000,0x00000000,
/*
MOVE MEMORY 4, addr_scratch, saved_dsa
at 0x00000021 : */ 0xc0000004,0x00000000,0x00000000,
/*
MOVE MEMORY 4, saved_dsa, addr_dsa
at 0x00000024 : */ 0xc0000004,0x00000000,0x00000000,
/*
JUMP reselected_check_next
at 0x00000027 : */ 0x80080000,0x000006f0,
/*
ABSOLUTE dsa_save_data_pointer = 0
ENTRY dsa_code_save_data_pointer
dsa_code_save_data_pointer:
; When we get here, TEMP has been saved in jump_temp+4, DSA is corrupt
; We MUST return with DSA correct
MOVE MEMORY 4, jump_temp+4, dsa_temp_addr_saved_pointer
at 0x00000029 : */ 0xc0000004,0x000009c8,0x00000000,
/*
; HARD CODED : 24 bytes needs to agree with 53c7,8xx.h
MOVE MEMORY 24, dsa_temp_addr_residual, dsa_temp_addr_saved_residual
at 0x0000002c : */ 0xc0000018,0x00000000,0x00000000,
/*
CLEAR ACK
at 0x0000002f : */ 0x60000040,0x00000000,
/*
MOVE MEMORY 4, saved_dsa, addr_dsa
at 0x00000031 : */ 0xc0000004,0x00000000,0x00000000,
/*
JUMP jump_temp
at 0x00000034 : */ 0x80080000,0x000009c4,
/*
ABSOLUTE dsa_restore_pointers = 0
ENTRY dsa_code_restore_pointers
dsa_code_restore_pointers:
; TEMP and DSA are corrupt when we get here, but who cares!
MOVE MEMORY 4, dsa_temp_addr_saved_pointer, jump_temp + 4
at 0x00000036 : */ 0xc0000004,0x00000000,0x000009c8,
/*
; HARD CODED : 24 bytes needs to agree with 53c7,8xx.h
MOVE MEMORY 24, dsa_temp_addr_saved_residual, dsa_temp_addr_residual
at 0x00000039 : */ 0xc0000018,0x00000000,0x00000000,
/*
CLEAR ACK
at 0x0000003c : */ 0x60000040,0x00000000,
/*
; Restore DSA, note we don't care about TEMP
MOVE MEMORY 4, saved_dsa, addr_dsa
at 0x0000003e : */ 0xc0000004,0x00000000,0x00000000,
/*
JUMP jump_temp
at 0x00000041 : */ 0x80080000,0x000009c4,
/*
ABSOLUTE dsa_check_reselect = 0
; dsa_check_reselect determines whether or not the current target and
; lun match the current DSA
ENTRY dsa_code_check_reselect
dsa_code_check_reselect:
MOVE LCRC TO SFBR ; LCRC has our ID and his ID bits set
at 0x00000043 : */ 0x72230000,0x00000000,
/*
JUMP REL (wrong_dsa), IF NOT dsa_temp_target, AND MASK 0x80
at 0x00000045 : */ 0x80848000,0x00ffff50,
/*
;
; Hack - move to scratch first, since SFBR is not writeable
; via the CPU and hence a MOVE MEMORY instruction.
;
MOVE MEMORY 1, reselected_identify, addr_scratch
at 0x00000047 : */ 0xc0000001,0x00000000,0x00000000,
/*
; BIG ENDIAN ON MVME16x
MOVE SCRATCH3 TO SFBR
at 0x0000004a : */ 0x72370000,0x00000000,
/*
; FIXME : we need to accommodate bit fielded and binary here for '7xx/'8xx chips
; Are you sure about that? richard@sleepie.demon.co.uk
JUMP REL (wrong_dsa), IF NOT dsa_temp_lun, AND MASK 0xf8
at 0x0000004c : */ 0x8084f800,0x00ffff34,
/*
; Patch the MOVE MEMORY INSTRUCTION such that
; the source address is the address of this dsa's
; next pointer.
MOVE MEMORY 4, dsa_temp_addr_next, reselected_ok_patch + 4
at 0x0000004e : */ 0xc0000004,0x00000000,0x000007e8,
/*
CALL reselected_ok
at 0x00000051 : */ 0x88080000,0x00000798,
/*
; Restore DSA following memory moves in reselected_ok
; dsa_temp_sync doesn't really care about DSA, but it has an
; optional debug INT so a valid DSA is a good idea.
MOVE MEMORY 4, saved_dsa, addr_dsa
at 0x00000053 : */ 0xc0000004,0x00000000,0x00000000,
/*
CALL dsa_temp_sync
at 0x00000056 : */ 0x88080000,0x00000000,
/*
; Release ACK on the IDENTIFY message _after_ we've set the synchronous
; transfer parameters!
CLEAR ACK
at 0x00000058 : */ 0x60000040,0x00000000,
/*
; Implicitly restore pointers on reselection, so a RETURN
; will transfer control back to the right spot.
CALL REL (dsa_code_restore_pointers)
at 0x0000005a : */ 0x88880000,0x00ffff68,
/*
RETURN
at 0x0000005c : */ 0x90080000,0x00000000,
/*
ENTRY dsa_zero
dsa_zero:
ENTRY dsa_code_template_end
dsa_code_template_end:
; Perform sanity check for dsa_fields_start == dsa_code_template_end -
; dsa_zero, puke.
ABSOLUTE dsa_fields_start = 0 ; Sanity marker
; pad 48 bytes (fix this RSN)
ABSOLUTE dsa_next = 48 ; len 4 Next DSA
; del 4 Previous DSA address
ABSOLUTE dsa_cmnd = 56 ; len 4 Scsi_Cmnd * for this thread.
ABSOLUTE dsa_select = 60 ; len 4 Device ID, Period, Offset for
; table indirect select
ABSOLUTE dsa_msgout = 64 ; len 8 table indirect move parameter for
; select message
ABSOLUTE dsa_cmdout = 72 ; len 8 table indirect move parameter for
; command
ABSOLUTE dsa_dataout = 80 ; len 4 code pointer for dataout
ABSOLUTE dsa_datain = 84 ; len 4 code pointer for datain
ABSOLUTE dsa_msgin = 88 ; len 8 table indirect move for msgin
ABSOLUTE dsa_status = 96 ; len 8 table indirect move for status byte
ABSOLUTE dsa_msgout_other = 104 ; len 8 table indirect for normal message out
; (Synchronous transfer negotiation, etc).
ABSOLUTE dsa_end = 112
ABSOLUTE schedule = 0 ; Array of JUMP dsa_begin or JUMP (next),
; terminated by a call to JUMP wait_reselect
; Linked lists of DSA structures
ABSOLUTE reconnect_dsa_head = 0 ; Link list of DSAs which can reconnect
ABSOLUTE addr_reconnect_dsa_head = 0 ; Address of variable containing
; address of reconnect_dsa_head
; These select the source and destination of a MOVE MEMORY instruction
ABSOLUTE dmode_memory_to_memory = 0x0
ABSOLUTE dmode_memory_to_ncr = 0x0
ABSOLUTE dmode_ncr_to_memory = 0x0
ABSOLUTE addr_scratch = 0x0
ABSOLUTE addr_temp = 0x0
ABSOLUTE saved_dsa = 0x0
ABSOLUTE emulfly = 0x0
ABSOLUTE addr_dsa = 0x0
; Interrupts -
; MSB indicates type
; 0 handle error condition
; 1 handle message
; 2 handle normal condition
; 3 debugging interrupt
; 4 testing interrupt
; Next byte indicates specific error
; XXX not yet implemented, I'm not sure if I want to -
; Next byte indicates the routine the error occurred in
; The LSB indicates the specific place the error occurred
ABSOLUTE int_err_unexpected_phase = 0x00000000 ; Unexpected phase encountered
ABSOLUTE int_err_selected = 0x00010000 ; SELECTED (nee RESELECTED)
ABSOLUTE int_err_unexpected_reselect = 0x00020000
ABSOLUTE int_err_check_condition = 0x00030000
ABSOLUTE int_err_no_phase = 0x00040000
ABSOLUTE int_msg_wdtr = 0x01000000 ; WDTR message received
ABSOLUTE int_msg_sdtr = 0x01010000 ; SDTR received
ABSOLUTE int_msg_1 = 0x01020000 ; single byte special message
; received
ABSOLUTE int_norm_select_complete = 0x02000000 ; Select complete, reprogram
; registers.
ABSOLUTE int_norm_reselect_complete = 0x02010000 ; Nexus established
ABSOLUTE int_norm_command_complete = 0x02020000 ; Command complete
ABSOLUTE int_norm_disconnected = 0x02030000 ; Disconnected
ABSOLUTE int_norm_aborted =0x02040000 ; Aborted *dsa
ABSOLUTE int_norm_reset = 0x02050000 ; Generated BUS reset.
ABSOLUTE int_norm_emulateintfly = 0x02060000 ; 53C710 Emulated intfly
ABSOLUTE int_debug_break = 0x03000000 ; Break point
ABSOLUTE int_debug_panic = 0x030b0000 ; Panic driver
ABSOLUTE int_test_1 = 0x04000000 ; Test 1 complete
ABSOLUTE int_test_2 = 0x04010000 ; Test 2 complete
ABSOLUTE int_test_3 = 0x04020000 ; Test 3 complete
; These should start with 0x05000000, with low bits incrementing for
; each one.
ABSOLUTE NCR53c7xx_msg_abort = 0 ; Pointer to abort message
ABSOLUTE NCR53c7xx_msg_reject = 0 ; Pointer to reject message
ABSOLUTE NCR53c7xx_zero = 0 ; long with zero in it, use for source
ABSOLUTE NCR53c7xx_sink = 0 ; long to dump worthless data in
ABSOLUTE NOP_insn = 0 ; NOP instruction
; Pointer to message, potentially multi-byte
ABSOLUTE msg_buf = 0
; Pointer to holding area for reselection information
ABSOLUTE reselected_identify = 0
ABSOLUTE reselected_tag = 0
; Request sense command pointer, it's a 6 byte command, should
; be constant for all commands since we always want 16 bytes of
; sense and we don't need to change any fields as we did under
; SCSI-I when we actually cared about the LUN field.
;EXTERNAL NCR53c7xx_sense ; Request sense command
; dsa_schedule
; PURPOSE : after a DISCONNECT message has been received, and pointers
; saved, insert the current DSA structure at the head of the
; disconnected queue and fall through to the scheduler.
;
; CALLS : OK
;
; INPUTS : dsa - current DSA structure, reconnect_dsa_head - list
; of disconnected commands
;
; MODIFIES : SCRATCH, reconnect_dsa_head
;
; EXITS : always passes control to schedule
ENTRY dsa_schedule
dsa_schedule:
;
; Calculate the address of the next pointer within the DSA
; structure of the command that is currently disconnecting
;
; Read what should be the current DSA from memory - actual DSA
; register is probably corrupt
MOVE MEMORY 4, saved_dsa, addr_scratch
at 0x0000005e : */ 0xc0000004,0x00000000,0x00000000,
/*
MOVE SCRATCH0 + dsa_next TO SCRATCH0
at 0x00000061 : */ 0x7e343000,0x00000000,
/*
MOVE SCRATCH1 + 0 TO SCRATCH1 WITH CARRY
at 0x00000063 : */ 0x7f350000,0x00000000,
/*
MOVE SCRATCH2 + 0 TO SCRATCH2 WITH CARRY
at 0x00000065 : */ 0x7f360000,0x00000000,
/*
MOVE SCRATCH3 + 0 TO SCRATCH3 WITH CARRY
at 0x00000067 : */ 0x7f370000,0x00000000,
/*
; Point the next field of this DSA structure at the current disconnected
; list
MOVE MEMORY 4, addr_scratch, dsa_schedule_insert + 8
at 0x00000069 : */ 0xc0000004,0x00000000,0x000001b8,
/*
dsa_schedule_insert:
MOVE MEMORY 4, reconnect_dsa_head, 0
at 0x0000006c : */ 0xc0000004,0x00000000,0x00000000,
/*
; And update the head pointer.
; Read what should be the current DSA from memory - actual DSA
; register is probably corrupt
MOVE MEMORY 4, saved_dsa, addr_scratch
at 0x0000006f : */ 0xc0000004,0x00000000,0x00000000,
/*
MOVE MEMORY 4, addr_scratch, reconnect_dsa_head
at 0x00000072 : */ 0xc0000004,0x00000000,0x00000000,
/*
CLEAR ACK
at 0x00000075 : */ 0x60000040,0x00000000,
/*
; Time to correct DSA following memory move
MOVE MEMORY 4, saved_dsa, addr_dsa
at 0x00000077 : */ 0xc0000004,0x00000000,0x00000000,
/*
WAIT DISCONNECT
at 0x0000007a : */ 0x48000000,0x00000000,
/*
JUMP schedule
at 0x0000007c : */ 0x80080000,0x00000000,
/*
;
; select
;
; PURPOSE : establish a nexus for the SCSI command referenced by DSA.
; On success, the current DSA structure is removed from the issue
; queue. Usually, this is entered as a fall-through from schedule,
; although the contingent allegiance handling code will write
; the select entry address to the DSP to restart a command as a
; REQUEST SENSE. A message is sent (usually IDENTIFY, although
; additional SDTR or WDTR messages may be sent). COMMAND OUT
; is handled.
;
; INPUTS : DSA - SCSI command, issue_dsa_head
;
; CALLS : NOT OK
;
; MODIFIES : SCRATCH, issue_dsa_head
;
; EXITS : on reselection or selection, go to select_failed
; otherwise, RETURN so control is passed back to
; dsa_begin.
;
ENTRY select
select:
CLEAR TARGET
at 0x0000007e : */ 0x60000200,0x00000000,
/*
; XXX
;
; In effect, SELECTION operations are backgrounded, with execution
; continuing until code which waits for REQ or a fatal interrupt is
; encountered.
;
; So, for more performance, we could overlap the code which removes
; the command from the NCRs issue queue with the selection, but
; at this point I don't want to deal with the error recovery.
;
; Enable selection timer
MOVE CTEST7 & 0xef TO CTEST7
at 0x00000080 : */ 0x7c1bef00,0x00000000,
/*
SELECT ATN FROM dsa_select, select_failed
at 0x00000082 : */ 0x4300003c,0x00000828,
/*
JUMP select_msgout, WHEN MSG_OUT
at 0x00000084 : */ 0x860b0000,0x00000218,
/*
ENTRY select_msgout
select_msgout:
; Disable selection timer
MOVE CTEST7 | 0x10 TO CTEST7
at 0x00000086 : */ 0x7a1b1000,0x00000000,
/*
MOVE FROM dsa_msgout, WHEN MSG_OUT
at 0x00000088 : */ 0x1e000000,0x00000040,
/*
RETURN
at 0x0000008a : */ 0x90080000,0x00000000,
/*
;
; select_done
;
; PURPOSE: continue on to normal data transfer; called as the exit
; point from dsa_begin.
;
; INPUTS: dsa
;
; CALLS: OK
;
;
select_done:
; NOTE DSA is corrupt when we arrive here!
MOVE MEMORY 4, saved_dsa, addr_dsa
at 0x0000008c : */ 0xc0000004,0x00000000,0x00000000,
/*
; After a successful selection, we should get either a CMD phase or
; some transfer request negotiation message.
JUMP cmdout, WHEN CMD
at 0x0000008f : */ 0x820b0000,0x0000025c,
/*
INT int_err_unexpected_phase, WHEN NOT MSG_IN
at 0x00000091 : */ 0x9f030000,0x00000000,
/*
select_msg_in:
CALL msg_in, WHEN MSG_IN
at 0x00000093 : */ 0x8f0b0000,0x0000041c,
/*
JUMP select_msg_in, WHEN MSG_IN
at 0x00000095 : */ 0x870b0000,0x0000024c,
/*
cmdout:
INT int_err_unexpected_phase, WHEN NOT CMD
at 0x00000097 : */ 0x9a030000,0x00000000,
/*
ENTRY cmdout_cmdout
cmdout_cmdout:
MOVE FROM dsa_cmdout, WHEN CMD
at 0x00000099 : */ 0x1a000000,0x00000048,
/*
;
; data_transfer
; other_out
; other_in
; other_transfer
;
; PURPOSE : handle the main data transfer for a SCSI command in
; several parts. In the first part, data_transfer, DATA_IN
; and DATA_OUT phases are allowed, with the user provided
; code (usually dynamically generated based on the scatter/gather
; list associated with a SCSI command) called to handle these
; phases.
;
; After control has passed to one of the user provided
; DATA_IN or DATA_OUT routines, back calls are made to
; other_transfer_in or other_transfer_out to handle non-DATA IN
; and DATA OUT phases respectively, with the state of the active
; data pointer being preserved in TEMP.
;
; On completion, the user code passes control to other_transfer
; which causes DATA_IN and DATA_OUT to result in unexpected_phase
; interrupts so that data overruns may be trapped.
;
; INPUTS : DSA - SCSI command
;
; CALLS : OK in data_transfer_start, not ok in other_out and other_in, ok in
; other_transfer
;
; MODIFIES : SCRATCH
;
; EXITS : if STATUS IN is detected, signifying command completion,
; the NCR jumps to command_complete. If MSG IN occurs, a
; CALL is made to msg_in. Otherwise, other_transfer runs in
; an infinite loop.
;
ENTRY data_transfer
data_transfer:
JUMP cmdout_cmdout, WHEN CMD
at 0x0000009b : */ 0x820b0000,0x00000264,
/*
CALL msg_in, WHEN MSG_IN
at 0x0000009d : */ 0x8f0b0000,0x0000041c,
/*
INT int_err_unexpected_phase, WHEN MSG_OUT
at 0x0000009f : */ 0x9e0b0000,0x00000000,
/*
JUMP do_dataout, WHEN DATA_OUT
at 0x000000a1 : */ 0x800b0000,0x000002a4,
/*
JUMP do_datain, WHEN DATA_IN
at 0x000000a3 : */ 0x810b0000,0x000002fc,
/*
JUMP command_complete, WHEN STATUS
at 0x000000a5 : */ 0x830b0000,0x0000065c,
/*
JUMP data_transfer
at 0x000000a7 : */ 0x80080000,0x0000026c,
/*
ENTRY end_data_transfer
end_data_transfer:
;
; FIXME: On NCR53c700 and NCR53c700-66 chips, do_dataout/do_datain
; should be fixed up whenever the nexus changes so it can point to the
; correct routine for that command.
;
; Nasty jump to dsa->dataout
do_dataout:
MOVE MEMORY 4, saved_dsa, addr_scratch
at 0x000000a9 : */ 0xc0000004,0x00000000,0x00000000,
/*
MOVE SCRATCH0 + dsa_dataout TO SCRATCH0
at 0x000000ac : */ 0x7e345000,0x00000000,
/*
MOVE SCRATCH1 + 0 TO SCRATCH1 WITH CARRY
at 0x000000ae : */ 0x7f350000,0x00000000,
/*
MOVE SCRATCH2 + 0 TO SCRATCH2 WITH CARRY
at 0x000000b0 : */ 0x7f360000,0x00000000,
/*
MOVE SCRATCH3 + 0 TO SCRATCH3 WITH CARRY
at 0x000000b2 : */ 0x7f370000,0x00000000,
/*
MOVE MEMORY 4, addr_scratch, dataout_to_jump + 4
at 0x000000b4 : */ 0xc0000004,0x00000000,0x000002e0,
/*
dataout_to_jump:
MOVE MEMORY 4, 0, dataout_jump + 4
at 0x000000b7 : */ 0xc0000004,0x00000000,0x000002f8,
/*
; Time to correct DSA following memory move
MOVE MEMORY 4, saved_dsa, addr_dsa
at 0x000000ba : */ 0xc0000004,0x00000000,0x00000000,
/*
dataout_jump:
JUMP 0
at 0x000000bd : */ 0x80080000,0x00000000,
/*
; Nasty jump to dsa->dsain
do_datain:
MOVE MEMORY 4, saved_dsa, addr_scratch
at 0x000000bf : */ 0xc0000004,0x00000000,0x00000000,
/*
MOVE SCRATCH0 + dsa_datain TO SCRATCH0
at 0x000000c2 : */ 0x7e345400,0x00000000,
/*
MOVE SCRATCH1 + 0 TO SCRATCH1 WITH CARRY
at 0x000000c4 : */ 0x7f350000,0x00000000,
/*
MOVE SCRATCH2 + 0 TO SCRATCH2 WITH CARRY
at 0x000000c6 : */ 0x7f360000,0x00000000,
/*
MOVE SCRATCH3 + 0 TO SCRATCH3 WITH CARRY
at 0x000000c8 : */ 0x7f370000,0x00000000,
/*
MOVE MEMORY 4, addr_scratch, datain_to_jump + 4
at 0x000000ca : */ 0xc0000004,0x00000000,0x00000338,
/*
ENTRY datain_to_jump
datain_to_jump:
MOVE MEMORY 4, 0, datain_jump + 4
at 0x000000cd : */ 0xc0000004,0x00000000,0x00000350,
/*
; Time to correct DSA following memory move