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/* $Id: devops.c,v 1.10 1997/05/14 20:44:59 davem Exp $
* devops.c: Device operations using the PROM.
*
* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
*/
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <asm/openprom.h>
#include <asm/oplib.h>
/* XXX Let's get rid of this thing if we can... */
extern struct task_struct *current_set[NR_CPUS];
/* Open the device described by the string 'dstr'. Returns the handle
* to that device used for subsequent operations on that device.
* Returns -1 on failure.
*/
int
prom_devopen(char *dstr)
{
int handle;
unsigned long flags;
save_flags(flags); cli();
switch(prom_vers) {
case PROM_V0:
handle = (*(romvec->pv_v0devops.v0_devopen))(dstr);
if(handle == 0) handle = -1;
break;
case PROM_V2:
case PROM_V3:
handle = (*(romvec->pv_v2devops.v2_dev_open))(dstr);
break;
case PROM_AP1000:
default:
handle = -1;
break;
};
__asm__ __volatile__("ld [%0], %%g6\n\t" : :
"r" (¤t_set[hard_smp_processor_id()]) :
"memory");
restore_flags(flags);
return handle;
}
/* Close the device described by device handle 'dhandle'. */
int
prom_devclose(int dhandle)
{
unsigned long flags;
save_flags(flags); cli();
switch(prom_vers) {
case PROM_V0:
(*(romvec->pv_v0devops.v0_devclose))(dhandle);
break;
case PROM_V2:
case PROM_V3:
(*(romvec->pv_v2devops.v2_dev_close))(dhandle);
break;
case PROM_AP1000:
default:
break;
};
__asm__ __volatile__("ld [%0], %%g6\n\t" : :
"r" (¤t_set[hard_smp_processor_id()]) :
"memory");
restore_flags(flags);
return 0;
}
/* Seek to specified location described by 'seekhi' and 'seeklo'
* for device 'dhandle'.
*/
void
prom_seek(int dhandle, unsigned int seekhi, unsigned int seeklo)
{
unsigned long flags;
save_flags(flags); cli();
switch(prom_vers) {
case PROM_V0:
(*(romvec->pv_v0devops.v0_seekdev))(dhandle, seekhi, seeklo);
break;
case PROM_V2:
case PROM_V3:
(*(romvec->pv_v2devops.v2_dev_seek))(dhandle, seekhi, seeklo);
break;
case PROM_AP1000:
default:
break;
};
__asm__ __volatile__("ld [%0], %%g6\n\t" : :
"r" (¤t_set[hard_smp_processor_id()]) :
"memory");
restore_flags(flags);
return;
}
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