Bh (Bootstrap And Halt); Disk I/O Via 167Bug System Calls; Controller Command Packets - Motorola MVME167 Series Installation Manual

Debugger General Information

BH (Bootstrap and Halt)

4

Disk I/O via 167Bug System Calls

Controller Command Packets

4-16
BH reads an operating system or control program from a specified
device into memory, and then returns control to 167Bug. It is used
as a debugging tool.
All operations that actually access the disk are done directly or
indirectly by 167Bug 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:
.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 conÞgure. This function allows you to change the
conÞguration of the speciÞed device.
.DSKFMT Disk format. This function allows you to send a format
command to the speciÞed 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.
Refer to the Debugging Package for Motorola 68K CISC CPUs User's
Manual for information on using these and other system calls.
To perform a disk operation, 167Bug must eventually present a
particular disk controller module with a controller command
packet which has been especially prepared for that type of
controller module. (This is accomplished in the respective
controller driver module.)