EMILE/first/scsi.i

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/*
*
* (c) 2005 Laurent Vivier <Laurent@Vivier.EU>
*
*/
/* SCSI constants */
.equ _SCSIGet, 0x0001
.equ _SCSISelect, 0x0002
.equ _SCSICmd, 0x0003
.equ _SCSIComplete, 0x0004
.equ _SCSIRead, 0x0005
.equ COMPLETION_TIMEOUT, 300
/* SCSI macros */
.macro SCSIDispatch selector
move.w #\selector, -(%sp)
dc.w 0xA815 /* _SCSIDispatch */
move.w (%sp)+, %d0
.endm
.macro get_second_size register
/* buffer size to store second level booter */
move.l second_size(%pc), \register
.endm
.macro load_second
lea container_end(%pc), %a6
lea TIB(%pc), %a0 /* TIB */
move.l %d0, TIB_buffer(%a0)
lea PRAM_buffer(%pc), %a0
move.l %d0, (%a0)
scsi_loop:
/* prepare CDB */
lea CDB(%pc), %a0
move.w -(%a6), %d2
beq exit_scsi
move.w %d2, CDB_nb_blocks(%a0)
move.l -(%a6), CDB_offset(%a0)
/* compute # of bytes to transfer = block size * # of blocks */
move.w block_size(%pc), %d1
mulu %d2, %d1
/* prepare TIB */
lea TIB(%pc), %a0 /* TIB */
move.l %d1, TIB_size(%a0)
/* SCSI sequence */
/* SCSIGet */
clr.w -(%sp)
SCSIDispatch(_SCSIGet)
/* SCSISelect */
clr.w -(%sp)
2005-12-01 23:53:49 +00:00
move.w unit_id(%pc), -(%sp)
SCSIDispatch(_SCSISelect)
/* SCSICmd */
clr.w -(%sp)
pea CDB(%pc)
move.w #10, -(%sp)
SCSIDispatch(_SCSICmd)
/* SCSIRead */
clr.w -(%sp)
pea TIB(%pc)
SCSIDispatch(_SCSIRead)
/* SCSIComplete */
clr.w -(%sp)
pea stat(%pc)
pea message(%pc)
move.l #COMPLETION_TIMEOUT, -(%sp)
SCSIDispatch(_SCSIComplete)
bra scsi_loop
exit_scsi:
lea PRAM_buffer(%pc), %a0
move.l (%a0), %a0
.endm
.equ READ_10, 0x28
.equ CDB_offset, 2
.equ CDB_nb_blocks, 7
.align 4
CDB:
.byte READ_10
.byte 0
.long 0 /* offset to read, big-endian, like m68k */
.byte 0
.short 0 /* number of blocks to read, big-endian */
.byte 0
.equ op_inc, 1
.equ op_no_inc, 2
.equ op_stop, 7
.equ TIB_buffer, 2
.equ TIB_size, 6
.align 4
TIB:
.short op_inc
.long 0
.long 0
.short op_stop
.long 0
.long 0
/* SCSI complete result */
stat: .short 0
message: .short 0