Motorola MVME162 ユーザーズマニュアル
Disk I/O Support
MVME162IG/D2
3-15
3
IOC (I/O Control)
IOC
allows you to send command packets as defined by the particular
controller directly. IOC can also be used to look at the resultant device packet
after using the IOP command.
after using the IOP command.
BO (Bootstrap Operating System)
BO
reads an operating system or control program from the specified device
into memory, and then transfers control to it.
BH (Bootstrap and Halt)
BH
reads an operating system or control program from a specified device into
memory, and then returns control to 162Bug. It is used as a debugging tool.
Disk I/O via 162Bug System Calls
All operations that actually access the disk are done directly or indirectly by
162Bug TRAP #15 system calls. (The command-level disk operations provide
a convenient way of using these system calls without writing and executing a
program.)
162Bug TRAP #15 system calls. (The command-level disk operations provide
a convenient way of using these system calls without writing and executing a
program.)
The following system calls are provided to allow user programs to do disk
I/O:
I/O:
Refer to the Debugging Package for Motorola 68K CISC CPUs User’s Manual for
information on using these and other system calls.
information on using these and other system calls.
.DSKRD
Disk read. System call to read blocks from a disk into memory.
.DSKWR
Disk write. System call to write blocks from memory onto a disk.
.DSKCFIG
Disk configure. This function allows you to change the configuration of
the specified device.
the specified device.
.DSKFMT
Disk format. This function allows you to send a format command to the
specified device.
specified device.
.DSKCTRL
Disk control. This function is used to implement any special device
control functions that cannot be accommodated easily with any of the
other disk functions.
control functions that cannot be accommodated easily with any of the
other disk functions.