1 line
23 KiB
Plaintext
1 line
23 KiB
Plaintext
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;*******************************************************
;
; SCSI Driver 'Read' filter.
;
; Written by Matt Gulick. Started June 13,1988
;
; Copyright Apple Computer, Inc. 1988,89
;
;*******************************************************
;*******************************************************
;
; This file contains the 'Read' filter as defined in
; the ERS.
;
;*******************************************************
;*******************************************************
;
; Revision History:
;
;*******************************************************
; June 13, 1988 File started.
; June 20, 1988 Registers in and out are
STRING PASCAL
BLANKS OFF
PAGESIZE 70
PRINT NOGEN
PRINT NOMDIR
MACHINE M65816
IMPORT unit_state
IMPORT main_drvr
IMPORT call_type
IMPORT r_get_cache
IMPORT r_all_in_cache
IMPORT divend
IMPORT divsor
IMPORT result
IMPORT max_blk_cnt
IMPORT m_blk_size
IMPORT m_blk_cnt
IMPORT calc_bytes
IMPORT m_rslt
IMPORT gsos_dpage
IMPORT divide
IMPORT check_532_rw
IMPORT chk_play_mode
IMPORT auto_sense_data
IMPORT sense_data
IMPORT open_flag
IMPORT get_data_status
IMPORT internal_buff
IMPORT scratch0
IMPORT internal
PRINT OFF
INCLUDE 'scsihd.equates'
INCLUDE 'M16.MEMORY'
INCLUDE 'M16.UTIL'
PRINT ON
EJECT
IF block_dvc = true\
AND character_dvc = false THEN
;*******************************************************
;
; Main Entry point to the 'Read' filter. This
; "Filter" takes the information given by the caller
; on direct page and builds the equivilent to a Read
; Extended Status Call. In order of appearence:
;
; Verify that Device # <09> $0000
; Call Number = $0002
; Block Size = dib.blksize
;
; We now Build the SCSI Main Driver Command and send
; it.
;
; The following will be validated by the Main Driver
; when it builds the command.
;
; Request Count = Block Size * i
; Block Number = Blk Num + Offset
; This is for partitions.
;
; After calling the Main driver and if no errors were
; encountered, then the Transfer count will be
; updated.
;
; Inputs: None.
;
; Outputs: Acc = 0
; Carry = 0
; Y register = Unspecified
; X register = Unspecified
; P register = 0=M=X=e
; Direct Page = Ours
; Data Bank = Ours
;
; Errors: See Spec.
;
;*******************************************************
ENDIF
IF character_dvc = true\
AND block_dvc = false THEN
;*******************************************************
;
; Main Entry point to the 'Read' filter. This
; "Filter" takes the information given by the caller
; on direct page and builds the equivilent to a Read
; Extended Status Call. In order of appearence:
;
; Verify that Device # <09> $0000
; Call Number = $0002
; Block Size = $0000
; Device Opened = True
;
; We now Build the SCSI Main Driver Command and send
; it.
;
; After calling the Main driver and if no errors were
; encountered, then the Transfer count will be
; updated.
;
; Inputs: None.
;
; Outputs: Acc = 0
; Carry = 0
; Y register = Unspecified
; X register = Unspecified
; P register = 0=M=X=e
; Direct Page = Ours
; Data Bank = Ours
;
; Errors: See Spec.
;
;*******************************************************
ENDIF
EXPORT Read
Read PROC
;-------------------------------------------------------------------------------
IF block_dvc = true\
AND character_dvc = false THEN
stz @cache
;
; Is the device Removable?
;
ldy #dib.dvcchar
lda [dib_ptr],y
and #removable
beq @online ;No.
;
; This device is removable. Now we
; need to check to see if the unit
; has gone offline, (then we need to
; report that to the OS) or if the
; unit has come back online (Rebuild
; the DIBs).
;
jsr unit_state
bcs @rts_out
;
; Is the device online?
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