/*
* disk boot
* devnm device name (possibly with the partition number)
* if it is NULL, the standard search order is used to look for a bootable device.
* return value error code
*/
EXPORT ER bootDisk( const UB *devnm )
{
DISKCB *dcb;
W pno, i, c;
ER err;
if ( devnm != NULL ) {
/* boot from the specified device */
pno = loadPBoot(devnm, &dcb);
if ( pno < E_OK ) return pno;
} else {
/* Boot using the standard boot order */
pno = E_BOOT;
for ( i = 0;; i++ ) {
devnm = bootDevice(i);
if ( devnm == NULL ) break; /* end is seen */
pno = loadPBoot(devnm, &dcb);
if ( pno >= 0 ) break;
}
}
if ( pno >= 0 ) {
/* Length of the device name without the partition number */
i = strlen(devnm);
c = devnm[i - 1];
if ( i >= 2 && c >= '0' && c <= '3' ) --i;
/* Set boot information */
strncpy(bootInfo.devnm, devnm, L_DEVNM);
bootInfo.devnm[i] = '\0'; /* erase partition number */
bootInfo.part = pno - 1;
bootInfo.start = dcb->part[pno].sblk;
bootInfo.secsz = dcb->blksz;
/* prepare for primary boot execution */
setUpBoot(PBootAddr, &bootInfo);
} else {
/* if boot from disk fails
try invoking ROM kernel */
err = bootROM();
if ( err < E_OK ) {
if ( err != E_ABORT ) err = pno;
return err;
}
}
return E_OK;
}
/*
* display help message with disk name listing
*/
LOCAL void prDiskHelp( const HELP *help )
{
const UB *devnm;
UW attr;
W i;
DSP_S(help->msg);
DSP_S(" device :");
for ( i = 0;; ++i ) {
devnm = ( help == &helpBD )? bootDevice(i): diskList(i, &attr);
if ( devnm == NULL ) break;
/* exclude devices that can not be specified */
if ( help == &helpWD && (attr & DA_RONLY) != 0 ) continue;
DSP_F2(CH,' ', S,devnm);
}
DSP_LF;
}